• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Driving device comprising: - a frame (19), - a screw-nut system comprising a threaded rod (18) and a first nut (20) in helical connection with the threaded rod (18), the threaded rod (18) being connected to the frame (19) by a pivot connection (218) allowing the threaded rod (18) to rotate relative to the frame (19) about a longitudinal axis (x) of the threaded rod (18), - a first position sensor (70) for detecting a limit position of the first nut (20) along the longitudinal axis (x), the first position sensor (70) comprising a first portion (71) and a second portion ( 72), the first position sensor (70) being responsive to a variation of a distance between the first portion (71) and the second portion (72) of the first position sensor along the axis (x), the first part (71) being fixed to the first nut (20) and the second part (72) being connected to the threaded rod (18) without passing through the connection pivot (218) and such that the rotation of the threaded rod (18) about the longitudinal axis (x) causes a distance variation between the first portion (71) and the second portion (72) of the first position sensor (70) along the longitudinal axis (x).
    公开号:FR3061316A1
    申请号:FR1601869
    申请日:2016-12-27
    公开日:2018-06-29
    发明作者:Francois Cadalen；Yohann FRAISSE；Francois Warnan
    申请人:Thales SA；
    IPC主号:
    专利说明:

    ® Agent (s): MARKS & CLERK FRANCE General partnership.
    FR 3 061 316 - A1 ® DRIVE DEVICE.
    @) Training device comprising:
    - a frame (19),
    - a screw-nut system comprising a threaded rod (18) and a first nut (20) in helical connection with the threaded rod (18), the threaded rod (18) being connected to the frame (19) by a pivot connection (218 ) allowing the threaded rod (18) to rotate relative to the frame (19) about a longitudinal axis (x) of the threaded rod (18),
    - a first position sensor (70) for detecting a limit position of the first nut (20) along the longitudinal axis (x), the first position sensor (70) comprising a first part (71) and a second part (72), the first position sensor (70) being sensitive to a variation of a distance between the first part (71) and the second part (72) of the first position sensor along the axis (x) , the first part (71) being fixed to the first nut (20) and the second part (72) being linked to the threaded rod (18) without passing through the pivot link (218) and so that the rotation of the threaded rod (18) around the longitudinal axis (x) causes a variation in distance between the first part (71) and the second part (72) of the first position sensor (70) along the longitudinal axis (x).

    TRAINING DEVICE
    The present invention relates to devices for driving a nut comprising a screw-nut system. In this type of device, the rotation of a threaded rod causes the translation of a nut, connected to the threaded rod by a helical connection, along the longitudinal axis of the rod.
    This type of device is notably implemented in detection devices for helicopter-borne fight against underwater threats in which an antenna for detecting underwater threats is suspended from an aerial platform such as for example an aircraft which makes it possible to immerse the antenna . The antenna includes the transmitters and receivers themselves and possibly electronic equipment associated with the transmitters and receivers. It can also include environmental sensors. In addition, on board the aerial platform, the detection device includes equipment necessary for the generation of the acoustic signals and for the processing of the received acoustic data.
    An example of a detection device is shown in FIG. 1. It comprises a winch 100 intended to be installed in an aerial platform. The airborne control device comprises an antenna 101 suspended at the end of an electro-tractor cable 102 of the winch 100, possibly provided with a funnel 103 (or “funnel” in English terminology) as is the case on the Figure 1. The winch 100 is intended to perform the deployment and recovery of the antenna 101. In Figure 1 the winch 100 is fixed to a floor 200 of an aerial platform. The electro-tractor cable 102 makes it possible to convey signals as well as the electrical energy necessary for the acoustic emission and / or the functioning of the receivers. By unwinding the cable 102 using the winch 100, the antenna 101 is lowered, through the possible funnel 103 into the water. Winding the cable 102 makes it possible to reassemble the antenna 101 in the aerial platform within the possible funnel 103 as shown in FIG. 1.
    The antenna 101 has an elongated, essentially cylindrical dome shape. It comprises an elongated body 112 having an outer circumference of substantially circular section in a plane perpendicular to the longitudinal axis z of the antenna 101. The elongated body 112 is surrounded by a protective structure 113 (or "bumper in English terminology -saxonne ") having an outer circumference of substantially circular section in a plane perpendicular to the longitudinal axis z of the antenna 101. The outer circumference of the protective structure 113 and the outer circumference of the elongated body 112 are substantially concentric. When the antenna 101 is suspended by its own weight from the cable 102, the latter also extends along the longitudinal axis z.
    Keeping the antenna 101 stationary in the aerial platform only by the cable 102 does not make it possible to obtain a sufficient level of security when the aerial platform is in transit, in particular over inhabited areas. The cable 102 can break, it can be cut accidentally by the pyrotechnic safety shears, the brake of the winch
    100 may drop and accidentally release the cable. The loss of the antenna
    101 means a significant financial loss, but above all, its significant mass could fall to the sea or to the ground, causing serious material or human damage.
    The position of the antenna 101 relative to the winch 100 must be locked when it is stationed on board the aerial platform. The detection device then advantageously comprises a strapping device 104 making it possible to lock the position of the antenna 101 relative to the winch 100 in order to prevent an accidental fall of the antenna and its consequences.
    A strapping device of the prior art 104 is shown in FIG. 2. It comprises a strapping 105 comprising a tightening strip 106 and pads 114 intended to be interposed between the protective structure 113 and the tightening strip 106. It also comprises a driving device 115 making it possible to move longitudinal ends 110 and 111 of the tightening band 106 relative to one another to reduce the size of the loop so as to be able to grip an object, for example the protective structure 113 of the antenna 101, during a so-called tightening step, or increase the size of the loop so as to be able to loosen or release an object initially enclosed by the strapping 105, during a so-called loosening step .
    Each end 110 and 111 of the tightening strip 106 is integral with a nut 121 and respectively 122, in translation relative to the threaded rod 118 along the axis x. The nuts are engaged with threads of the threaded rod made in the opposite direction so that the tightening and loosening are carried out by moving the ends of the tightening strip 106 in the opposite direction along the longitudinal axis of a threaded rod 118. The driving of the threaded rod 118 in rotation can be carried out by a motor not shown or by an operator by means of a wheel, via a gear not shown.
    The tightening of the strip 106 must be limited to avoid damaging the antenna or damage to the screw-nut system or more simply to allow loosening. Too much tightening can cause the nut to lock on the threaded rod requiring excessive torque to be exerted to release the antenna. It is possible to limit the stroke as well as tightening as loosening.
    In order to limit the travel of the nuts, the drive device includes a control member for controlling the motor and two position sensors for detecting limit loop sizes in the direction of tightening and loosening. The control unit stops the motor after detection of the limit loop sizes.
    As visible in FIG. 2, each position sensor comprises a push button switch 123 and 124 fixed to the frame 109 and an actuator, in the form of a stop, 125 and respectively 126 fixed to one of the nuts 121 and respectively 122. The stop 125 comes to bear on push button 127 of switch 123 and pushes it perpendicular to the x axis of threaded rod 118 so as to close switch 123 when, during the loosening phase, the size of the loop reaches a threshold value which corresponds to a threshold position of the nut 121 along the threaded rod 118 in loosening. The stop 126 presses on the push button 128 and pushes it perpendicular to the x axis of the threaded rod 118 to close the switch 124 when, during the tightening phase, the size of the loop reaches another threshold value which corresponds to a threshold position of the nut 122 along the threaded rod 118 in tightening. Ramps pivoting about axes perpendicular to the plane of FIG. 2 are provided at the interface between each push button 127 or 128 and its stop 125 or 126 so as to avoid deterioration of the push button 127 or 128.
    However, the Applicant has found that the sensors are disrupted in operation, which has the consequence of modifying the values of the detected threshold sizes and leads to excessive tightening and / or loosening which can damage the drive device as well as the antenna. . In order to avoid these excesses, an adjustment of the sensors is necessary before each operation.
    An object of the invention is to provide a training device comprising a position sensor making it possible to detect a predetermined position more reliably.
    To this end, the invention relates to a training device comprising:
    - a frame,
    - a screw-nut system comprising a threaded rod and a first nut in helical connection with the threaded rod, the threaded rod being connected to the frame by a pivot connection allowing the threaded rod to rotate relative to the frame around a longitudinal axis threaded rod,
    a first position sensor making it possible to detect a limit position of the first nut along the longitudinal axis, the first position sensor comprising a first part and a second part, the first position sensor being sensitive to a variation of a distance between the first part and the second part of the first position sensor along the axis, the first part being fixed to the first nut and the second part being linked to the threaded rod without passing through the pivot connection and so that the rotation of the threaded rod around the longitudinal axis causes a variation in distance between the first part and the second part of the first position sensor along the longitudinal axis.
    Advantageously, the device comprises at least one of the characteristics below taken alone or in combination:
    - the second part of the first sensor is in helical connection with the threaded rod,
    the screw-nut system comprises a second nut in helical connection with the threaded rod, the first nut being engaged with a first thread of the threaded rod and the second nut being engaged with a second thread of the threaded rod, the first threading and the second threading being carried out in the opposite direction, the drive device comprising a second position sensor making it possible to detect a limit position of the second nut along the longitudinal axis with respect to the frame, the second position sensor comprising a first part and a second part, the second position sensor being sensitive to a variation in distance between the first part and the second part of the second position sensor along the axis, the first part of the second position sensor being fixed to the second nut and the second part of the second position sensor being linked to the threaded rod without passing by the pivot connection and so that the rotation of the threaded rod around the longitudinal axis causes a variation in distance between the first part and the second part of the second position sensor along the longitudinal axis,
    - the first thread and the second thread have the same pitch called the first pitch,
    - the second part of the second sensor is in helical connection with the threaded rod,
    - the second part of the two sensors is engaged with the same additional thread,
    the second thread has a second pitch, the additional thread being made in the same direction as the second thread and has a third pitch different from the second pitch,
    the additional thread is interposed between the first thread and the second thread and has a third pitch greater than the first pitch,
    - the first part and the second part of the first sensor include a push button switch and an actuator for actuating a push button of the push button switch to cause a change of state of the switch,
    - The first position sensor is configured to be sensitive to a variation in distance between its first part and its second part along the x axis but not to a variation in angular relative position between its first part and its second part around the x axis,
    - the push button is in slide connection parallel to the longitudinal axis with a fixed part of the switch and the stop extends in a plane substantially perpendicular to the longitudinal axis,
    - it includes a motor coupled to the threaded rod to allow the threaded rod to rotate about its longitudinal axis,
    - It includes a control member for controlling the motor, the control member receiving measurements from the first position sensor and being able to control the motor from the measurements,
    - the control member receives measurements from the second position sensor, the control device being configured to stop the engine as soon as the limit position of the first nut is detected when the threaded rod turns in a first direction, and in a delayed manner after detection of the limit position of the second nut, when the threaded rod turns in the opposite direction.
    The invention also relates to a strapping device making it possible to surround an object by means of a strapping comprising a tightening band comprising a first end and a second end and forming a loop intended to surround the object, the strapping device comprising a drive device according to the invention, making it possible to move the two ends relative to each other to widen or reduce the size of the loop, the first end of the strapping being integral with the first nut in translation along the line 'axis of the threaded rod.
    Advantageously, the second end is integral with the second nut in translation along the axis of the threaded rod.
    The loop can be closed.
    The invention also relates to a holding device for gripping a hollow object, said device comprising a first sole and a second sole capable of coming to bear on a hollow object, inside the hollow object, the device holding device comprising a drive device according to the invention, the drive device being configured to move the two soles relative to each other so as to separate them from one another to come and tighten the object or bring them closer to release the object, the first sole being integral with the first nut in translation along the axis of the threaded rod, the screw-nut system comprising a second nut engaged with a second thread made in the opposite direction of first thread, the second sole being integral with the second nut in translation along the axis of the threaded rod.
    The invention will be better understood by studying a few embodiments described by way of non-limiting examples, and illustrated by appended drawings in which:
    FIG. 1, already described, schematically represents a detection device,
    FIG. 2 schematically represents a strapping section encircling an antenna and a drive device of the prior art,
    - Figure 3 schematically shows a strapping device according to the invention,
    - Figures 4 and 5 schematically show in section (Figure 4) and in perspective (Figure 5) the drive device in more detail,
    FIG. 6 represents a simplified kinematic diagram of the drive device,
    - Figure 7 shows a partial view of a holding device according to the invention.
    From one figure to another the same elements are designated by the same reference numerals.
    The invention relates to a drive device with a screw-nut system. This device can be used in a strapping device 4 intended to be integrated into an airborne control device or detection device as shown in FIG. 1. The strapping device 4 then replaces the strapping device 104. The invention relates also the strapping device 4 and the detection device as shown in FIG. 1 comprising the strapping device 4 according to the invention. The strapping device 4 can more generally be used to enclose any type of object, preferably of circular section.
    The screw-nut type drive device can be used for devices other than strapping devices which require driving a nut along a threaded rod and detecting a position of the nut along the screw. For example, the drive device can be implemented in a machine tool where a plate moves in translation. The implementation of the invention is useful for detecting a position of the plate.
    As can be seen in FIG. 3, the strapping device 4 according to the invention comprises a strapping 5 adapted to surround an object, for example an antenna 101 and more precisely its protective structure
    113, for example with a substantially circular section, and making it possible to enclose or release the object. The strapping 5 comprises a tightening strip 6 forming a loop intended to surround the object 101. The tightening strip 6 comprises two longitudinal ends 10 and 11.
    The strapping device 4 also comprises a tightening / loosening device 15 or driving device making it possible to move the ends 10 and 11 of the tightening band 6 relative to each other to reduce the size of the loop so to be able to grip an object, for example the antenna 101, during a so-called tightening step, or to increase the size of the loop so as to be able to loosen or release an object initially gripped by the strapping 5, during a so-called loosening step. The variation in the size of the loop is a variation in the length of the perimeter of the loop, that is to say the diameter of the loop. The shortening of the perimeter of the loop which occurs during tightening, creates pressure on the object to be clamped 101 and creates an assembly by clamping between the strapping 5 and the object 101. To maintain the tightening of the object 101, the tightening / loosening mechanism 15 maintains tensile forces on the free ends of the strapping 5. A frame 19 delimits a housing 19a receiving the strapping 5. The housing 19a here has a circular section in the z axis (perpendicular to the plane of Figure 3).
    The tightening / loosening device 15 comprises a screw-nut system comprising a threaded rod 18 and at least one nut 20. More precise views of the drive device 15 are shown in FIG. 4 (in section) and in FIG. 5 (in perspective).
    The threaded rod 18 is linked to the frame 19 by a pivot link 218, visible in FIG. 3, allowing the threaded rod 18 to rotate relative to the frame 19 around a longitudinal axis x of the threaded rod 18. The link 218 is for example formed by two smooth bearings produced respectively in two plates 218a, 218b secured to the frame 19, visible in Figure 4, and spaced along the axis x. The connection 218 can be made otherwise, for example, by means of one or two rolling bearings.
    The screw-nut system also comprises a first nut 20 linked in helical connection to the threaded rod 18 and to the frame 19 by a connection preventing the nut from turning relative to the frame 19 around the x axis. In Figure 5, plates 220a and 220b parallel to each other and to the axis of the rod 18 are arranged on either side of the nut 20 so as to enclose the nut 20. The screw-nut system comprises a second nut 21 in helical connection with the threaded rod 18 and connected to the frame 19 by a connection 221a, 221b preventing the nut 21 from rotating relative to the frame 19 around the x axis. In FIG. 5, plates 221a and 221b parallel to each other and to the axis of the rod 18 are arranged on either side of the nut 21 so as to enclose the nut 21. The plates 220a, 220b and 221a and 221b are in pivot connection (along an axis perpendicular to the x axis) with the ends 10 and 11 respectively of the clamping band 6 which are themselves locked in rotation relative to the frame 19 around the x axis by a locking of the tightening band 6 in the housing 19a.
    The nut 20 is engaged with a first thread 22 of the threaded rod 18, shown diagrammatically in FIG. 3, and the nut 21 is engaged with a second thread 23 of the threaded rod 18. The threads 22 and 23 are performed in reverse and may have the same pitch. Different steps are also possible. The first end 10 of the clamping strip 6 is secured to the nut 20 in translation relative to the frame 19 along the axis x and the second end 11 of the clamping strip 6 is secured to the nut 21 in translation by relative to the frame 19 along the x axis. Consequently, the screw-nut system is configured to move the two ends of the tightening band 10 and 11 in opposite directions parallel to the axis x with respect to the frame 19 when the threaded rod 18 rotates around its axis in one direction. (tightening) and in the opposite direction (loosening). The ends 10 and 11 approach each other during loosening and move away from each other during tightening. In the embodiment of the figures, each end 10 and 11 is in pivot connection with a nut 20 and respectively 21 around an axis perpendicular to the plane of the loop formed by the tightening band 6. As a variant, the ends 10 and 11 can be integral with the respective nuts 20 and 21, that is to say fixed to the nuts or integral with the nuts.
    In the embodiment of the figures, the screw-nut system comprises two nuts 20 and 21 each linked at one end 10 and 11 respectively. As a variant, it comprises a single nut in helical connection with the threaded rod 18 and fixed in rotation around the axis x relative to the frame 19 and integral with one of the ends of the clamping band in translation relative to the frame along the axis x so as to be able to drive this end relative to the frame along the axis x. The other end is for example fixed to the frame 19.
    As shown in FIG. 5, the tightening / loosening device comprises a gear train 30 comprising two toothed wheels 33, 34 in engagement with each other making it possible to drive the screw in rotation. A motor 50 (shown in Figure 5) drives the wheel 34 in rotation. The gear train 30 transmits this rotational movement to the threaded rod 18 via the wheel 33. The motor 50 is for example coupled to the wheel 34 by means of a reduction gear (not shown).
    The drive device 15 comprises a control member 61 making it possible to control a motor 50. This member controls the motor on the basis of information from the position sensors 70, 80 shown in FIG. 3. Each position sensor 70 or 80 is capable of detecting a predetermined position of a nut 20 or 21 relative to the threaded rod 18 along the longitudinal axis x corresponding to a given size of the loop. The sensor 70 is configured to detect a limit position of the nut 20 relative to the threaded rod 18 along the axis x corresponding to a limit loosening size of the loop. The sensor 80 is configured to detect a limit position of the nut 21 relative to the threaded rod 18 along the axis x corresponding to a limit tightening size of the loop. The limit positions of the two nuts along the x axis are different.
    The control member 61 is configured to stop the motor 50 when the limit loosening size is reached while the threaded rod 18 rotates in a direction corresponding to the loosening and when the tightening limit size is reached while the threaded rod 18 rotates In the opposite way. These stops can be instantaneous or deferred as we will see later.
    As visible in FIG. 3, each sensor 70 or 80 comprises two parts, a first part 71 or 81 of which is fixed to the corresponding nut 20 or respectively 21. In other words, each first part 71 and 81 is in helical connection with the threaded rod 18 via one of the nuts 20 and respectively 21.
    Each sensor comprises a second part 72 which is here common to the two sensors 70 and 80 and forms a plate perpendicular to the axis x which will be described more precisely below. The second part 72 is mounted so that the rotation of the threaded rod 18 about a longitudinal axis x of the threaded rod 18 causes a variation in distance between the first part 71 or 81 and the second part 72 of the position sensor 70 or respectively 80 along the longitudinal axis x of the threaded rod 18, the position sensor 70 or respectively 80 being configured to be sensitive to this variation in distance.
    According to the invention, as visible in FIG. 3, the second part 72 is linked to the threaded rod 18 without passing through the pivot link 218 shown in FIG. 3. In fact, the pivot link 218 has an axial clearance along the x axis. It is an imperfect pivot link. With the assembly according to the invention, the clearance of this link 218 which is highly stressed has no impact on the adjustment of the sensor which then has the advantage of being stable, precise and controlled. The clearance of the pivot link 218 between the two parts of each sensor 70, 80 is saved.
    In the embodiment of the figures, the part 72 is in helical connection with the threaded rod 18 and is linked to the frame 19 by a connection preventing rotation of the part 72 relative to the frame 19. This is achieved by means of two tabs 272a, 272b visible in FIG. 5, extending longitudinally along the x axis and spaced along an axis perpendicular to the x axis so as to enclose a block 200 integral with the plates 220a and 220b which are themselves locked in rotation relative to the frame 19 around the x axis.
    The part 72 is then engaged with a thread 73, shown diagrammatically in FIG. 3, of the threaded rod via a nut 24.
    As a variant, it is possible to link part of the two parts of a position sensor to the threaded rod 18 by making it integral with the threaded rod 18, or else by fixing it to the threaded rod 18 in translation along the x axis and by fixing it to the frame 19 in rotation along the x axis. These connections do not pass through the pivot link 218.
    In the nonlimiting embodiment of the figures, as visible in FIG. 4, the first part 71, 81 of each sensor is a push button switch. The second part 72 is an actuator produced, here, in the form of a stop. The actuator 72 makes it possible to actuate the push button 75 or 85 to cause a change of state of the switch. Each switch is able to be either in a closed state or in an open state. A change of state of the switch corresponds to a transition from the open state to the closed state or vice versa.
    The first switch 71 and its actuator 72 are configured and arranged so that the first actuator 72 causes a change in state of the first switch 71 when the first nut 20 reaches its limit position relative to the threaded rod 18 along the 'x axis. This limit position corresponds to the limit loosening size of the buckle. The second switch 81 and the second actuator 72 are configured and arranged so that the second actuator 72 causes a change of state of the second switch 81 when the second nut 21 arrives at its limit position relative to the threaded rod 18 according to the x axis. This position corresponds to the limit tightening size of the loop. The information on the change of state of each switch is transmitted to the controller 61.
    The push button switch 71 or 81 is fixed to a nut 20 or 21. The push button switch 71 or 81 comprises a fixed part 74 or 84 integral with the nut 20 or 21. The fixed part 74, 84 comprises a circuit not shown. The switch comprises a push button 75 or 85 movable in translation relative to the fixed part 74 or 84. The fixed part 74 or 84 comprises a contact of the normally open type. The push button 75 or 85 can come into physical contact with a circuit of the fixed part to close the circuit. The switch then switches to the closed state. The switch is open when the push button is distant from the circuit. Alternatively, at least one switch is of the normally closed type contact.
    The push buttons 75 and 85 are movable in translation relative to the respective fixed parts 74 and 84 substantially parallel to the x axis. In other words, each push button 75 or 85 is in slide connection with its nut 20 or 21 parallel to the x axis. Each push button 75 or 85 is interposed between the contact of its switch 71 or 81 and the stop 72 along the x axis. The push button 75 or 85 will therefore come to close the switch 71, 81 when the stop 72 will approach the fixed part 74 or 84 and push the push button 75 or 85 until it contacts.
    As visible in FIG. 3, the stop 72 is engaged with a thread 73 of the threaded rod which is produced in the same direction as the thread 23 (in engagement with the nut 21) but in the opposite direction to the thread 22 (in taken with nut 20). The thread 73 has a different pitch from the thread 23 so as to be able to bring the two parts 72 and 71 closer together at least when the threaded rod turns in one direction. In the nonlimiting example of the figures, the threads 22 and 23 have a pitch of 1.5 mm / revolution, the thread 73 has a pitch of 1.75 mm.
    The operation of the device is as follows. Starting from an initial position in which the central nut 24 (or the stop 72) is in the center, the tightening band 6 is in the intermediate position between tight and loose. By operating the threaded rod 18 in one direction around the x axis, the nuts 20 and 21 move in the opposite direction because the threads 22 and 23 are made in the opposite direction. In this direction which is for example the direction of loosening, the nuts 20 and 21 approach each other carrying with them the ends 10 and 11 of the tightening band 6. The size of the loop increases. The stop 72 goes in the opposite direction from the nut 20 and approaches it. The stop 72 goes against the push button 75 at a rate of 3.75 mm / revolution. The stop 72 comes into contact with the first push button 75, moves it, relative to the fixed part 74, in the direction x in the direction of movement of the stop 72 and thus bring it into contact with the switch contact 71 so as to cause the state of the switch 71 to change. The limit position of the nut 20 along the x axis, relative to the threaded rod 18, corresponding to the loosening size limit of the loop is then detected . This information is sent to the control member 61. Advantageously but not necessarily, the control member 61 is configured to stop the motor 50 as soon as the limit position of the nut 20 is detected when the threaded rod 18 rotates in the sense of loosening. The hoop 6 is for example fully retracted into its housing 19a in the frame 19, and it should not be pushed further into it, otherwise it will get stuck there. The stop must therefore be very precise because, during the next recovery of the antenna, it must be certain that the strapping is open to the maximum but without risk of jamming. This high relative speed between stop 72 and the first push button 75 allows very precise adjustment. When opened, the properly adjusted hoop 6 will stop its movement always in the same position. As a variant, the control member 61 stops the motor 50 in a deferred manner after detection of the limit position of the nut 20 during loosening, that is to say when the threaded rod 18 rotates in the tightening direction.
    Now when the motor 50 rotates the threaded rod 18 in the opposite direction around the axis x, that is to say in the direction of tightening. The nuts 20 and 21 moving in opposite directions then move away from each other and the size of the loop decreases. The stop 72 moves in the same direction as the nut 21, but a little faster since its pitch is 1.75. The stop 72 will therefore gradually catch up with the push button 85 at a rate of 0.25 mm / revolution. The stop 72 ends up catching the push button 85, comes to drive it in translation along the x axis towards the contact of the fixed part 84 which causes the change of state of the switch 81. The limit position of the nut 21 relative to the threaded rod 18 along the x axis corresponding to the tightening size limit of the loop is detected. This information is transmitted to the control unit 61 which stops the motor to stop the tightening, preferably but not necessarily, in a deferred manner after reception of the detection information. When the tightening limit size is reached, the motor continues to drive the rod 18 to tighten the tightening band until the loop reaches a predetermined threshold size. This guarantees complete tightening of the antenna regardless of the antenna diameter within a predetermined diameter range. It is observed that the tightening will always benefit from a wide range of uncertainty since the advancement of the contact is only 0.25 mm / revolution in relative. This large range makes it easy to adapt to antennas of different diameters provided that the delay in the actual stopping of the motor after contact is sufficient. Furthermore, the low relative speed of advance between the two parts of the switch 81 makes it possible not to damage the push button 85 when the engine is stopped in a delayed manner after detection of the limit position in tightening. Push button 85 continues to depress but at low speed. The maximum stroke of the push button 85 can then be reduced, the switch is then compact. As a variant, the control member 61 is configured to stop the motor 50 as soon as the state change information from the switch 81 is received when the threaded rod rotates in the tightening direction.
    In the nonlimiting embodiment of the figures, the sensors 70 and 80 comprise the same actuator 72 which is here a plate extending substantially in a plane perpendicular to the axis x. This stop 72 common to the two sensors is engaged with a thread 73 disposed between the other two threads 22 and 23. This embodiment is particularly advantageous because it is compact and requires few parts.
    Advantageously, the pitch of the third thread 73 engaged with the stop 72 is greater than the pitch of the second thread 23. This makes it possible to bring the nut 21 and the stop 72 closer together when the rod turns in the tightening direction and their distance when the rod 18 rotates in the opposite direction.
    Advantageously, as is the case in the embodiment of the figures, the pitch of the third thread 73 is greater than that of the first thread 22. The approximation of the nut 20 and the stop 72 when they move in the opposite direction, is then fast and allows the movement to stop at a precise position.
    As a variant, the second parts of the two sensors are separate. One can for example provide a stopper by sensor. These second parts can then be engaged with threads different from the threaded rod. At least one of the sensors may have a second fixed part relative to the threaded rod or at least fixed in translation relative to the threaded rod. At least one of the second parts is engaged with a thread arranged outside the space delimited by the threads 22 and 23 along the x axis.
    We can invert the first part and the second part of at least one sensor. For example, the first part of at least one sensor is an actuator and the second part of at least one sensor is a push button. One can for example fix at least one of the two push button switches to the nut 24 and fix the actuator corresponding to the nut 20 or 21. One can for example fix the two switches to the nut 21 by arranging them in opposite direction along the x axis and provide two stops fixed to the respective nuts 20 and 21.
    In the embodiment of the figures, the sensors 70, 80 are of the push button actuator / switch type. As a variant, at least one sensor is another type of sensor. It is for example a magnetic sensor, an optical sensor, a sensor of the inductive type, a Doppler effect sensor making it possible to detect a variation in distance between two parts of the sensor along the x axis. . However, these sensors require processing to detect the desired position. These sensors can also have a second common part or separate second parts. Depending on the case, a sensor may be sufficient.
    Advantageously, each sensor, or at least one sensor, is configured and arranged to be sensitive to a variation in distance between its two parts parallel to the x axis but not to a variation in relative angular position between its two parts around the x axis. This makes the adjustment of the sensor insensitive to the angular play of the connection of its nut relative to the frame. Furthermore, since only the relative axial movement is taken into account, if the parts of a sensor move tangentially or radially relative to the rod along the x axis (due to the play of the helical connection), this does not has no importance because their relative distance along the x axis does not vary. The solution is therefore not very sensitive to expansions, vibrations, movements, as long as the distance set between the two parts of the position sensors does not vary, the hoop will open and tighten in the same way.
    This is for example the case of the embodiment of the figures, in which each sensor 70 and 80 comprises a stop 72 extending substantially in a plane perpendicular to the x axis and a push button switch 71 or 81 comprising a push button 75 or 85 in sliding connection with a nut 20 or respectively 21 parallel to the x axis. This solution has the advantage of being compact and simple. It can be performed with push buttons of reasonable diameter compatible with the aeronautical field. Furthermore, this embodiment does not require the installation, as in the prior art, of a pivoting ramp so that the drive device accepts, without deterioration, a bringing together of the fixed part of the switch and the stop after closing the switch. The very nature of the push button allows this approximation. We can therefore get rid of a tedious step of adjusting the ramp and the relative position of the ramp and the stop along the y axis. This is also for example the case of an optical sensor comprising a source emitting a light ray parallel to the x axis, a second part in the form of a reflecting plate perpendicular to the x axis and a detector making it possible to detect a ray reflected by the plate and measuring a difference of a physical quantity between the incident ray and the reflected ray and by deducting a distance between the plate and the source along the x axis.
    As a variant, the sensor is sensitive to the variation in relative angular position between its two parts around the stop. For example, the position sensors have an arrangement similar to that of the prior art.
    The drive device 15 also comprises a thumb wheel 52, visible in FIG. 5, secured to the wheel 33 in rotation about its axis of rotation. This wheel allows an operator to manually rotate the rod.
    FIG. 6 represents a simplified kinematic diagram of the drive device. The helical connections 220 and 221 between the nuts 20 and respectively 21 and the threaded rod are shown as well as the pivot connections 218 and 340 between the frame 19 and the threaded rod 18 and respectively the wheel
    34. It is also noted that the push buttons 75 and 85 are in sliding connections with the fixed parts 74 and 84 of the respective switches. The connections preventing rotation of the nuts relative to the frame are not shown.
    Advantageously, as shown in FIG. 6, the drive device 15 comprises a torque limiter 54 configured and arranged to suppress the transmission of torque between the motor 50 and the threaded rod 18 when the torque around the axis of the threaded rod exceeds a predetermined threshold. Advantageously, in addition to the torque limiter 54, the movement transmission device comprises a free wheel 55. The torque limiter 54 and the free wheel 55 are configured and arranged to allow the limitation of a torque of rotation of the threaded rod 18 around the x axis in a direction of rotation only where the free wheel 55 allows rotation and therefore sliding in the torque limiter. In the other direction, the freewheel does not allow any rotation and the torque limiter cannot act. Advantageously, the direction of rotation in which the torque limiter acts is the direction corresponding to the tightening. This device prevents the tightening torque from exceeding a predetermined threshold which is the same regardless of the diameter of the antenna. The delayed stop of the engine during tightening ensures that the torque limiter slides before the engine stops. On the other hand, the torque limiter does not act in the direction of loosening. Limiting the angular travel of the threaded rod in the tightening direction makes it possible to ensure that an operator or that the motor 50 can tighten the tightening band after loosening, the torque limiter acting only when tightening.
    The motor 50 is coupled to the second wheel 34 by means of the torque limiter 54 and of the possible free wheel 55. The free wheel 55 allows two shafts 56 and 57 to be coupled / uncoupled linked to the frame 19 by connections pivot 340 and respectively 341. A first shaft 56 is integral with the wheel 34 and the other 57 is a shaft with the motor 50.
    In the embodiment of the figures, the tightening band 6 forms a closed loop. In other words, the clamping band comprises two strands of band 7 and 8 referenced in FIG. 4 each comprising one of the two ends 10 and 11 of the clamping band 6 and intersecting so that a closed loop intended to completely surround the object to be gripped, that is to say to make a complete turn around the object, is formed by the tightening band 6. The use of a band 6 forming a closed loop by crossing two strands of band allows to vary significantly the size of the loop and thus to grip and release objects with different diameters. As a variant, the tightening strip 6 does not form a closed loop. In this case, its ends approach when tightening and move away during loosening. In this case, the two ends come closer when tightening and move away when loosening. It can then be envisaged to provide second parts, for example stops, distinct for the two sensors, engaged with different threads arranged outside the space delimited by the two threads 22 and 23.
    The tightening strip 6 comprises for example a metal strip or a plastic strip. The perimeter or size of the loop varies, for example, during tightening, by a variation in the bending of the tightening band. The strip advantageously has a shape at rest such that the central part substantially follows the shape of the perimeter of the object to be clamped.
    The strapping 5 also comprises pads 14 distributed along the clamping strip so as to be intended to be interposed between the clamping strip 6 and the object to be clamped 101. A pad, not shown here can be supported on the two strip strands 7 and 8 so as to be interposed between the two strip strands 7 and 8 and the object to be clamped.
    The controller 61 may include one or more dedicated electronic circuits or a general-purpose circuit. Each electronic circuit can comprise a reprogrammable calculation machine (a processor or a microcontroller for example) and / or a computer executing a program comprising a sequence of instructions and / or a dedicated calculation machine (for example a set of logic gates like an FPGA, a DSP or an ASIC, or any other hardware module).
    The drive device according to the invention can be integrated into another type of holding device 350 as shown in FIG. 7 of the type comprising two soles 310 and 320 intended to hold or release an object. For clarity, only the threaded rod (without the third thread), the nuts, the flanges and the bars 312, 313 have been shown, but the drive device is a drive device according to the invention. The flanges 310 and 320 are respectively fixed in translation along the x axis to the nut 20 and to the nut 21 via bars 312 and 313 respectively which intersect. When the rod 18 rotates in one direction, the nuts 20 and 21 move closer together and the flanges 310, 320 move apart so as to come to bear on a hollow body 314, for example of cylindrical section, inside the hollow body of so as to exert forces in the opposite direction parallel to the x axis, for example opposite, on the hollow body to tighten the body. These efforts are advantageously radial, along the same radial axis defined for a circular section of a hollow body. When the threaded rod 18 rotates in the opposite direction, the nuts move away and the flanges approach so as to move away from the hollow body and to release it. As a variant, the direction of movement of the flanges is that of the nuts. For example, bars 312 and 313 do not cross. For clarity, only the two threads 22 and 23 of the threaded rod are shown in Figure 7. The other elements of the drive device are not shown the sensors and the third thread are not shown in Figure 6 to clarify more. Advantageously, the torque limiter 54 and the possible freewheel 55 are arranged to allow the limitation of a torque of the threaded rod 18 around the axis x in one direction of rotation, and possibly only in this direction. This direction of rotation is the direction corresponding to the tightening, that is to say the direction of rotation causing the separation of the two flanges and therefore the bringing together of the two nuts.
    权利要求:
    Claims (18)
    [1" id="c-fr-0001]
    1. Training device comprising:
    - a frame (19),
    - a screw-nut system comprising a threaded rod (18) and a first nut (20) in helical connection with the threaded rod (18), the threaded rod (18) being connected to the frame (19) by a pivot connection (218 ) allowing the threaded rod (18) to rotate relative to the frame (19) about a longitudinal axis (x) of the threaded rod (18),
    - a first position sensor (70) for detecting a limit position of the first nut (20) along the longitudinal axis (x), the first position sensor (70) comprising a first part (71) and a second part (72), the first position sensor (70) being sensitive to a variation of a distance between the first part (71) and the second part (72) of the first position sensor along the axis (x) , the first part (71) being fixed to the first nut (20) and the second part (72) being linked to the threaded rod (18) without passing through the pivot link (218) and so that the rotation of the threaded rod (18) around the longitudinal axis (x) causes a variation in distance between the first part (71) and the second part (72) of the first position sensor (70) along the longitudinal axis (x).
    [2" id="c-fr-0002]
    2. Drive device according to the preceding claim, wherein the second part (72) of the first sensor (70) is in helical connection with the threaded rod (18).
    [3" id="c-fr-0003]
    3. Drive device according to any one of the preceding claims, in which the screw-nut system comprises a second nut (21) in helical connection with the threaded rod (18), the first nut (20) being engaged with a first thread (22) of the threaded rod (18) and the second nut (21) being engaged with a second thread (23) of the threaded rod (18), the first thread (22) and the second thread (23 ) being carried out in the opposite direction, the drive device comprising a second position sensor (80) making it possible to detect a limit position of the second nut (21) along the longitudinal axis (x) relative to the frame (19) , the second position sensor (80) comprising a first part (81) and a second part (72), the second position sensor (80) being sensitive to a variation in distance between the first part (81) and the second part (72) of the second position sensor along of the axis (x), the first part (81) of the second position sensor (80) being fixed to the second nut (21) and the second part (72) of the second position sensor (80) being linked to the rod threaded (18) without passing through the pivot link (218) and so that the rotation of the threaded rod (18) around the longitudinal axis (x) causes a variation in distance between the first part (81) and the second part (72) of the second position sensor (80) along the longitudinal axis (x).
    [4" id="c-fr-0004]
    4. Drive device according to the preceding claim, wherein the first thread (22) and the second thread (23) have a same pitch called first pitch.
    [5" id="c-fr-0005]
    5. Drive device according to any one of claims 3 to 4, wherein the second part (72) of the second sensor (80) is in helical connection with the threaded rod (18).
    [6" id="c-fr-0006]
    6. Drive device according to the preceding claim in that it depends on claim 2, wherein the second part (72) of the two sensors (70; 80) is engaged with the same additional thread (73).
    [7" id="c-fr-0007]
    7. Drive device according to claim 6, wherein the second thread (23) has a second pitch, the additional thread (73) being made in the same direction as the second thread (23) and has a third pitch different from second step (23).
    [8" id="c-fr-0008]
    8. Drive device according to claims 4 and 7, wherein the additional thread (73) is interposed between the first thread (22) and the second thread (23) and has a third pitch greater than the first pitch.
    [9" id="c-fr-0009]
    9. Drive device according to any one of the preceding claims, in which the first part (71) and the second part (72) of the first sensor (70) comprise a push button switch (71, 81) and an actuator (72) for actuating a push button (75) of the push button switch to cause a change of state of the switch.
    [10" id="c-fr-0010]
    10. Drive device according to any one of the preceding claims, in which the first position sensor (70) is configured to be sensitive to a variation in distance between its first part and its second part along the x axis but not to a variation of angular relative position between its first part and its second part around the x axis.
    [11" id="c-fr-0011]
    11. Drive device according to claim 10 in that it depends on claim 9, wherein the push button (75) is in sliding connection parallel to the longitudinal axis (x) with a fixed part (74) of the switch and the stop (72) extends in a plane substantially perpendicular to the longitudinal axis (x).
    [12" id="c-fr-0012]
    12. Drive device according to any one of the preceding claims, comprising a motor (50) coupled to the threaded rod (18) to allow the threaded rod (18) to be rotated about its longitudinal axis (x) .
    [13" id="c-fr-0013]
    13. Drive device according to the preceding claim, comprising a control member (61) for controlling the motor (50), the control member (61) receiving measurements from the first position sensor and being able to control the motor (50) from the measurements.
    [14" id="c-fr-0014]
    14. Drive device according to the preceding claim and according to claim 8, wherein the control member receives measurements from the second position sensor (80), the control device (61) being configured to stop the engine ( 50) upon detection of the limit position of the first nut (20) when the threaded rod (18) rotates in a first direction, and in a delayed manner after detection of the limit position of the second nut (21), when the threaded rod (18 ) turns in the opposite direction.
    [15" id="c-fr-0015]
    15. Strapping device (4) making it possible to surround an object by means of a strapping (5) comprising a tightening band (6) comprising a first end (10) and a second end (11) and forming a loop intended to surround the object, the strapping device comprising a driving device according to any one of the preceding claims, making it possible to move the two ends relative to each other to enlarge or reduce the size of the loop, the first end (10) of the hoop (6) being integral with the first nut (20) in translation along the axis of the threaded rod (8).
    [16" id="c-fr-0016]
    16. Strapping device according to the preceding claim, wherein the drive device is a drive device according to claim 3 and wherein the second end is integral with the second nut (21) in translation along the axis of the rod threaded (18).
    [17" id="c-fr-0017]
    17. Strapping device according to any one of claims 15 to 16, in which the loop is closed.
    [18" id="c-fr-0018]
    18. Holding device for gripping a hollow object, said device comprising a first sole and a second sole capable of coming to bear on a hollow object, inside the hollow object, the holding device comprising a device drive according to any one of claims 1 to 14, the drive device being configured to move the two soles relative to each other so as to separate them from each other to come to tighten the object or bring them closer to release the object, the first sole being integral with the first nut in translation along the axis of the threaded rod (18), the screw-nut system comprising a second nut engaged with a second thread made in opposite direction of the first thread, the second sole being integral with the second nut in translation along the axis of the threaded rod (18).
    1/6
    200
    104
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    同族专利:
    公开号 | 公开日
    EP3562742A1|2019-11-06|
    PL3562742T3|2021-04-19|
    FR3061316B1|2019-01-25|
    US20190338840A1|2019-11-07|
    WO2018122243A1|2018-07-05|
    EP3562742B1|2020-12-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR318545A|1902-02-10|1902-10-18|Moteurs Et Automobiles Dechamp|Double-acting progressive screw brake|
    US3220514A|1963-11-20|1965-11-30|Gen Motors Corp|Air cooled external band brake|
    JPS53106072A|1977-02-28|1978-09-14|Dainippon Screen Mfg|Comparing and concentrating method of error in accumulation pitch in drive screw|
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    FR2839352A1|2002-05-03|2003-11-07|Ratier Figeac Soc|Recirculating ball or roller mechanism e.g. for use in aircraft has position sensor on safety nut to detect abnormal displacement|
    US20050173994A1|2004-02-09|2005-08-11|Societe Industrielle De Sonceboz Sa|Linear actuator|
    US20090199610A1|2005-04-06|2009-08-13|Kikuchi Seisakusho Co., Ltd.|Actuator, parallel link mechanism using the same, and long material bending device|
    EP2210767A1|2007-11-22|2010-07-28|Aisin Seiki Kabushiki Kaisha|Position detection device for vehicle and seat position detection device|
    WO2013027197A2|2011-08-25|2013-02-28|Sonceboz Automotive Sa|Linear actuator|
    EP3015740A2|2014-10-29|2016-05-04|Sagem Defense Securite|Actuating device for moving a helicopter tail part|CN110142682A|2019-06-18|2019-08-20|河南理工大学|A kind of mechanical workpieces polissoir|
    FR3061315B1|2016-12-27|2019-01-25|Thales|TRAINING DEVICE|
    CN111026202B|2019-09-30|2021-03-26|陕西雷神智能装备有限公司|Motion equipment drive-by-wire signal generation device and drive-by-wire motion equipment|
    法律状态:
    2017-11-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-29| PLSC| Publication of the preliminary search report|Effective date: 20180629 |
    2019-11-28| PLFP| Fee payment|Year of fee payment: 4 |
    2020-11-25| PLFP| Fee payment|Year of fee payment: 5 |
    2021-11-26| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1601869|2016-12-27|
    FR1601869A|FR3061316B1|2016-12-27|2016-12-27|TRAINING DEVICE|FR1601869A| FR3061316B1|2016-12-27|2016-12-27|TRAINING DEVICE|
    PCT/EP2017/084615| WO2018122243A1|2016-12-27|2017-12-27|Driving device|
    EP17829664.6A| EP3562742B1|2016-12-27|2017-12-27|Driving device|
    PL17829664T| PL3562742T3|2016-12-27|2017-12-27|Driving device|
    US16/473,976| US20190338840A1|2016-12-27|2017-12-27|Driving device|
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