• 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:
    The lifting platform includes a working platform 130 and an lifting structure 120 supporting the platform 130 from one side. At least three force sensors 41, 42, preferably four, are interposed between the lifting structure 120 and the platform 130. The support interfaces of the force sensors 41, 42 are all located on one side of the floor. 131 of the platform 130 which is located towards the side of the working platform by which it is supported by the lifting structure 120. Each of the force sensors 41, 42 is provided to measure the force exerted only in the vertical direction by the platform 130 on its support interface when the floor of the work platform extends horizontally.
    公开号:FR3087761A1
    申请号:FR1860021
    申请日:2018-10-29
    公开日:2020-05-01
    发明作者:Christian DeVaux
    申请人:Haulotte Group SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of mobile lifting platforms for personnel (also designated by the acronym PEMP) also commonly called lifting platforms.
    It relates more particularly to aerial work platforms which include a mast supporting the work platform of the aerial work platform.
    Aerial work platforms are machines designed to allow one or more people to work at height.
    For this, they include a working platform designed to receive people.
    The work platform is supported by an elevating structure which allows it to be raised from a lowered position on the lifting platform frame to the desired height working position.
    The lifting structure is often arranged on a turret which is pivotally mounted on the frame, which makes it possible to change the orientation of the lifting mechanism - and therefore of the platform - with respect to the frame.
    Finally, the chassis is generally equipped with wheels or tracks making it possible to move the lifting platform on the ground.
    It is most often motorized to allow autonomous movement on the ground of the lifting platform.
    The work platform is usually equipped with a control station allowing an operator on board the platform to cause it to move to reach the desired working position.
    Each model of aerial work platform is designed to support a maximum load that must not be exceeded in order to avoid the risk of accidents, for example to prevent the aerial work platform from dumping.
    Therefore, it is desirable to equip the lifting platform with a weighing system making it possible to determine the load on board the lifting platform in order to limit or prevent the lifting of the platform or the movement of the lifting platform. ground.
    And contemporary normative developments make the presence of such a weighing system compulsory for certain categories of lifting platforms and impose a certain degree of precision in the measurement carried out.
    Today, it turns out that there is no satisfactory weighing system for lifting platforms with vertical masts, especially those of the type directly supporting the work platform.
    A vertical mast lifting platform is a lifting platform whose lifting structure includes a fixed vertical mast which supports the working platform, i.e. the mast extends vertically with respect to the frame without the possibility of modifying its angle to the frame.
    The mast is extendable vertically generally by means of a plurality of boxes which fit together and slide between them in the vertical direction 21FR2P1-181029-Patent application 2.
    They usually have a weight of between 800 and 1200 kg and a maximum lifting height of the order of 6 to 10 m.
    In the case of aerial work platforms with vertical masts directly supporting the work platform, the latter is mounted directly to the last box of the vertical mast 5 that the work platform generally partially surrounds, unlike aerial work platforms with vertical masts. supporting the work platform by means of a pendulum arm mounted at one end to the last box of the vertical mast and supporting the work platform by its other end.
    For aerial work platforms with vertical masts, it is possible to estimate the load 10 by measuring the pressure in the mast lifting cylinder.
    However, the measurement accuracy is poor because of the friction between the mast boxes and also because of the use of a multi-body lifting cylinder, that is to say which in fact corresponds to several cylinders connected to each other and for which it turns out that the evolution of the pressure in the different jacks is different from one jack to another and variable, for example, according to the location of the load on the work platform.
    To date, load weighing systems on board the work platform have primarily been developed for aerial work platforms equipped with a telescopic mast which can be tilted relative to the frame.
    This type of aerial work platform usually weighs between 6 and 22 tonnes for a maximum lift height usually between 12 and 42 m.
    A first approach consists in supporting the work platform by means of four load cells mounted on a rigid frame and positioned near the corners of the work platform, the rigid frame being supported by the lifting structure.
    This approach is illustrated for example by CN 106006504 A.
    However, such a rigid frame 25 has a significant mass, which makes this solution unsuitable for light machines such as a lifting platform with a vertical mast, in particular because of the increased risk of overturning.
    In addition, in CN 106006504 A, the guardrail is mounted directly on the rigid frame so that the weighing system does not take into account the loads possibly hung or placed by the users on the guardrail.
    In a second approach, a weighing system is positioned laterally between the platform and the lifting structure.
    It comprises a mechanical device through which the lifting structure supports the work platform and to which is associated a force sensor.
    The mechanical device is designed to dissociate the weight of the work platform and the moments which result from the cantilever positioning of the work platform so that the force sensor is subjected exclusively to the weight. of the work platform and therefore only measure the work platform.
    3 This approach is disclosed by EP 1 382 562 B1 where the mechanical device is a metallic test body provided with a force sensor based on strain gauges.
    It is also disclosed by WO 2017/177219 where the mechanical device is in the form of an articulated parallelogram.
    These systems according to the second approach are ill-suited to be implemented in lifting platforms with vertical mast, and even less in those of the type where the vertical mast directly supports the work platform.
    Indeed, the mechanical device is heavy, which makes these weighing systems unsuitable for light machines such as a lifting platform with a vertical mast, in particular because of the increased risk of tipping.
    In addition, the lateral placement of the weighing system between the lifting structure and the working platform is not easily adaptable to a vertical mast lifting platform directly supporting the working platform because the vertical mast supports the lifting platform. work platform from below.
    15 But even in the case where provision is also made to place the weighing system under the working platform, as is the case in EP 1 382 562 B1, the large size of the mechanical device has the disadvantage of increasing that of the lifting platform, especially its height in the lowered state, which is detrimental both for the transport of the lifting platform and for the ease of access of the user to the working platform.
    This second approach is also proposed by CN 106430020 A in a simpler version in which the mechanical device comprises two frames pushed back by springs arranged between them and a mechanical position switch operating in all or nothing and actuated by one of the frames in case of exceeding a threshold.
    However, this system combines all the above drawbacks while being less precise, presenting a risk of jamming and not allowing continuous measurement of the load on board the working platform.
    There is therefore a need for a system for weighing the load on board the work platform which is better suited to be implemented in lifting platforms with vertical masts, in particular those of the type whose vertical mast supports. directly to the work platform.
    The object of the present invention is to provide an aerial platform weighing technology which is better suited to be implemented in vertical mast lifting platforms, but which can optionally also be used for other types of aerial platforms.
    To this end, the present invention provides a lifting platform, comprising: - a working platform comprising a floor and a guardrail, 4 - an lifting structure for moving the working platform in height, the lifting structure comprising an extendable mast through which the working platform is supported, the lifting structure supporting the working platform only from one side of the working platform, and 5 - at least three force sensors interposed between the lifting structure and the working platform by means of which the lifting structure fully supports the weight of the working platform, in which: - the force sensors are arranged in a fixed spatial relationship between them, 10 - the force sensors are arranged so that, in orthogonal projection on a plane corresponding to the floor of the work platform, the force sensors are all located on the same side of a center line the floor of the work platform which is the one located towards the side of the work platform by which it is supported by the lifting structure, 15 - each of the force sensors is designed to measure the force exerted on him only in the vertical direction by the working platform when the floor of the working platform extends horizontally.
    In other words, each of the force sensors is designed to measure the force exerted on it only in the direction perpendicular to the floor of the work platform.
    In the invention, the work platform is therefore mounted cantilevered with respect to the lifting structure and to the force sensors.
    The force sensors are therefore subjected both to the weight of the work platform, including the load on its board, as well as to the forces resulting from the moments which appear due to the cantilever mounting, unlike the first and second approaches of the prior art where the force sensor (s) are only subjected to weight.
    But because the force sensors are provided to measure the force exerted on them only in the vertical direction by the working platform when the floor of the working platform extends horizontally, the weight of the work platform. work platform including the load on board, is nevertheless easily determinable with a satisfactory precision by carrying out the addition of the algebraic measurements provided by the force sensors.
    It will be understood that the force sensors are interposed between the lifting structure and the work platform, being distributed spatially so as to be each subjected to a specific force by the work platform.
    The invention is advantageous over the prior art for several reasons.
    Compared to the first approach of the prior art, the force sensors occupy a significantly smaller region which is located on the side of the work platform by which it is supported.
    As a result, the force sensors can be supported by a smaller structure, and therefore also less heavy.
    Compared to the second approach, the invention dispenses with the need for a heavy and cumbersome mechanical device to dissociate the weight of the work platform and the moments resulting from its cantilever mounting in order to subject the sensor to effort than weight.
    According to preferred embodiments, the invention comprises one or more of the following characteristics: the force sensors each have their own support interface to support the work platform or to be supported by the lifting structure, and each of the force sensors is provided to measure the force exerted only in the vertical direction by the work platform on its support interface when the floor of the work platform extends horizontally or to measure the force exerted only in the vertical direction by its support interface on the lifting structure when the floor of the work platform extends horizontally; in particular, provision can be made for the force sensors each to have its own support interface for supporting the work platform, each of the force sensors being provided to measure the force exerted only in the vertical direction by the work platform on its support interface when the floor of the work platform extends horizontally; - The force sensors are distributed so that, in an orthogonal projection on a plane, the support interfaces occupy the vertices of a polygon; 25 - the lifting structure supports the working platform from the middle of one side of the working platform and the force sensors or the support interfaces of the force sensors are arranged symmetrically with respect to a median plane of the floor of the work platform which is perpendicular to said median line; - the support interface of each force sensor comprises a flat support surface, the flat support surfaces of the support interfaces of the force sensors being coplanar; the support interface of each force sensor comprises a flat support surface extending parallel to the floor of the work platform or the support interface of each force sensor comprises a support surface plane extending perpendicular to the floor of the work platform; 6 - the force sensors are arranged under the floor or, seen in orthogonal projection on a plane corresponding to the floor of the work platform, the force sensors are arranged outside the floor; - at least two of the force sensors are based on strain gauges 5 arranged on or in a common test body, the support interface of each of these two sensors forming part of the common test body, - the common test body has a bar shape comprising two opposite longitudinal ends, the support interface of one of the two force sensors being arranged in a region towards one of the longitudinal ends and the support interface on the other of the two force sensors being arranged in a region towards the other longitudinal end, - the force sensors are four in number, - the support interfaces of the four force sensors are arranged, in projection orthogonal on a plane, along the vertices of a square, rectangle or isosceles trapezoid; - two of the force sensors are based on strain gauges arranged on or in a first common test body in the form of a bar, the support interface of each of these two sensors forming part of the first test body, and the other two force sensors are based on strain gauges arranged on or in a second common test body separate from the first test body, the support interfaces of each of these two other sensors forming part of the second test body; - the extendable mast is a fixed vertical mast, the mast being extendable by means of a plurality of boxes which fit together and slide between them in a vertical direction, the mast supporting the work platform by means of the upper box to which the work platform is rigidly mounted by means of the force sensors, - the upper part of the guardrail is in sliding contact against the vertical wall of the upper box to support the work platform; - the upper box of the mast has projecting supports on at least two opposite sides of the box, the force sensors being fixed on said supports; - the first test body is fixed on one of the supports and the second test body is fixed on the other support; - Said supports are horizontal, the first and second test body 35 being placed between the floor of the work platform and the corresponding horizontal support of the upper box while lying horizontally between them; 7 - the extendable mast is a fixed vertical mast, the mast being extendable by means of a plurality of boxes which fit together and slide between them in the vertical direction, the mast supporting the work platform through the upper box , the lifting structure further comprising a pendulum arm, one end of which is articulated to the upper box of the vertical fixed mast and an opposite end supports the work platform, or the extendable mast is a mast tiltable relative to a supporting frame the lifting structure, the mast optionally comprising sections articulated between them. 10 - the lifting structure supports the working platform by a narrow side of the working platform; the lifting platform further comprises an electronic processing device for determining the load placed on the platform from the force measurements supplied by the force sensors.
    Other characteristics and advantages of the invention will become apparent on reading the following description of a preferred embodiment of the invention, given by way of example and with reference to the appended drawing.
    FIG. 1 represents a view of a lifting platform with a vertical mast according to one embodiment of the invention, the vertical mast being extended to the maximum.
    Figure 2 shows another view of the lifting nacelle of Figure 1 with the vertical mast retracted as far as possible.
    FIG. 3 represents a detailed view of the lifting platform weighing system according to the first embodiment, which corresponds to the zone referenced III in FIG. 2.
    FIG. 4 represents one of the force sensors of the lifting platform weighing system of the first embodiment.
    FIG. 5 is a top view of the work platform of the lifting basket of the first embodiment, which shows the arrangement of the support interfaces of the load sensors of the weighing system.
    FIG. 6 illustrates the forces measured by the force sensors for a loading case of the work platform of the lifting platform of the first embodiment.
    FIG. 7 represents a view similar to FIG. 3, but for a variant of the first embodiment in which the two force sensors share the same test body so as to form a double sensor.
    FIG. 8 represents a view of a double force sensor used in the variant of FIG. 7.
    8 Figure 9 shows a view of the pendulum arm and the working platform of a lifting basket according to a second embodiment in which the lifting structure comprises a pendulum arm mounted at one end to the upper end of the extendable mast and supporting at its other end the working platform.
    FIG. 10 represents a variant of the assembly of the force sensors with respect to the assembly illustrated in FIG. 9.
    With reference to FIGS. 1 to 6, we will now describe a lifting platform 1 according to a first embodiment.
    The aerial work platform 1 is a vertical fixed mast aerial work platform 20 forming the lifting structure of the aerial work platform 1, it being understood that the mast 20 is effectively vertical when the aerial work platform is placed on horizontal flat ground.
    The mast 20 is vertically extendable by means of a plurality of boxes which fit together and slide between them in the vertical direction under the action of a multi-body jack 15.
    The lifting platform 1 comprises a frame 10 on which the mast 20 is rigidly mounted, that is to say without the possibility of rotation with respect to the frame 10, nor the possibility of modifying its inclination with respect to the frame 10.
    The frame 10 comprises wheels 11, 12 - or alternatively caterpillars - allowing the translation of the lifting platform 20 1 on the ground.
    The frame 10 is preferably motorized to allow the autonomous movement of the lifting platform 1 on the ground.
    The lifting platform 1 comprises a working platform 30 which is rigidly supported by the mast 20, that is to say without the possibility of displacement of the working platform 30 relative to the mast 20.
    For this, the working platform 30 is mounted rigidly to the last box 21 of the vertical mast 20, that is to say the uppermost box when the mast 20 is extended.
    The work platform 30 comprises a floor 31 and a guardrail 35.
    The floor 31 extends perpendicularly to the mast 20, in other words the floor 31 is horizontal when the lifting platform 1 rests on a horizontal flat ground.
    The work platform 30 has a generally rectangular base plane - cf. Figure 5 - which substantially corresponds to the base plane of the frame 10.
    The mast 20 supports the work platform 30 through the middle of a narrow side 36 thereof which conventionally defines the rear side of the lifting platform 1.
    The box 21 is surrounded on either side and the front side by the work platform 30, while the rear side of the box 21 is substantially aligned with the rear side of the work platform 30.
    9 The lifting platform 1 is equipped with a weighing system to determine the load present on the working platform 30.
    It comprises four force sensors 41, 42, 43, 44 which are mounted between the box 21 and the work platform 30 so as to fully support the weight of the work platform 30.
    More specifically, the force sensors 41 to 44 are arranged in pairs on either side of the box 21.
    Thus, the force sensors 41, 42 are arranged on a first lateral side of the box 21 and the force sensors 43, 44 are arranged on a second lateral side of the box 21 opposite to the first.
    A first horizontal support 22 is arranged projecting on the first lateral side 10 of the box 21 for mounting the force sensors 41, 42.
    It may be a foundry part attached to the box 21, for example by welding.
    The horizontal support 22 comprises an upper surface 23 on which the force sensors 41, 42 are fixed by any suitable means such as screws.
    The surface 23 is preferably machined to provide good positioning of the force sensors 41, 42.
    A second horizontal support - not visible in the figures - similar to the first is arranged on the second lateral side of the box 21 for mounting the force sensors 43, 44.
    The force sensors 41 to 44 are placed under the floor 31 of the work platform 30 so as to support the work platform 30 by its floor 31.
    Each of the force sensors 41, 42, 43, 44 has a respective support interface 41a, 42a, 43a, 44a through which they support the floor 31 of the work platform 30.
    In this case, it is a beam 32 of the structure forming the floor 31 which is fixed - by screws or any other suitable means - on the support interfaces 41a, respectively 42a, of the force sensors 41, respectively 42.
    Similarly, another beam - not visible - of the structure forming the floor 31 is fixed to the support interfaces 43a, respectively 44a, of the force sensors 43, respectively 44.
    As can be seen in FIG. 5, the support interfaces 41a to 44a and more generally the force sensors 41 to 44 are arranged symmetrically with respect to a vertical median plane X of the floor 31 of the work platform 30: cf. 30 figure 5.
    Such an arrangement facilitates the installation of the force sensors 41 to 44 relative to the lifting structure and favorably distributes the forces exerted by the work platform on the support interfaces 41a to 44a of the force sensors 41 to 44, taking into account that the lifting structure supports the working platform 30 from the middle of a side of the latter through which the median plane X passes.
    This allows identical dimensioning of the force sensors 41 and 42 with respect to the force sensors 43 and 44 which are arranged on either side of the median plane.
    This also contributes to improving the precision of the determination of the load made from the measurement of the force sensors 41 to 44.
    View in orthogonal projection on a plane corresponding to the floor 31, the force sensors 41a to 44a are all arranged on the side of the transverse median line 5 Y of the floor 31 which is that located towards the narrow side 36 by which the mast 20 supports the work platform 30, that is to say to the left of the transverse center line Y of the floor 31 in FIG. 5.
    Consequently, the working platform 30 is therefore mounted cantilevered with respect to the force sensors 41 to 44 and to their support interfaces 41a to 44a.
    10 In this case, the four support interfaces 41a, 42a, 43a, 44a are arranged, in orthogonal projection on the plane corresponding to the floor 31, along the vertices of a rectangle, or even of a square, as can be seen in figure 5.
    The positioning of the support interfaces 41a to 44a along the vertices of a rectangle or a square is convenient due to the rectangular cross section of the 15 boxes of the mast 20, in particular the box 21 on either side of which the force sensors 41 to 44 are mounted.
    But the support interfaces 41a to 44a can also be arranged at the vertices of a polygon other than a rectangle or square, for example those of an isosceles trapezoid.
    The fact for the support interfaces 41a to 44a of the force sensors 41 to 44 to occupy the vertices of a polygon in orthogonal projection on a plane, provides a spatial distribution thereof providing an efficient stable maintenance of the weight. work platform 30. In this case, the work platform 30 is of the extendable type, that is to say that the floor 31 comprises a fixed part 31a which is rigidly mounted on the force sensors 41 to 44 and a sliding part 31b with respect to the fixed part 31a so as to be able to vary the length of the working platform 30.
    Similarly, the guardrail 35 comprises a fixed part mounted on the fixed part 31a of the floor 31 and a sliding part 35b fixedly mounted on the sliding part 31b of the floor 31.
    It will be understood that the reference to the transverse center line Y of the floor 31 is defined in the situation where the sliding part 31b is retracted to the maximum, that is to say for which the length of the working platform 30 is. minimal.
    In this first embodiment, the support interfaces 41a to 44a each comprise a flat surface parallel to the floor 31 - that is to say horizontal like the floor 31 - and are coplanar, which has the advantage of compactness. and the simplicity of mounting the force sensors.
    Alternatively, the support interfaces can be located in different horizontal planes.
    Each of the force sensors 41 to 44 is capable of providing a measurement of the force exerted perpendicularly on the flat surface of its support interface 41a to 44a.
    The force sensors 41 to 44 are strain gauge sensors each comprising a respective test body in the form of a bar.
    The test body is generally subjected to bending for this type of sensor.
    An example of configuration for the force sensor 42 is illustrated in FIG. 4.
    In this case, the support interface 42a, on the upper side of the bar, comprises the aforementioned horizontal flat surface and a hole for fixing to the horizontal flat surface the beam 32 of the floor 31 by means of a screw. or a bolt.
    The bar has on its lower face a surface forming a mounting interface 42b provided with two through holes, for positioning and fixing on the horizontal support 22 of the box 21.
    The force sensors 41, 43 and 44 can be identical to the force sensor 42.
    As can be seen in FIG. 3, the force sensors are placed between the beam 32 of the floor 31 of the work platform 30 and the corresponding horizontal support 22 of the box 21 while lying horizontally between them.
    The use of strain gauge sensors having a test body in the form of a bar is advantageous because this type of sensor is commonly available commercially and they are economical while providing good precision.
    In addition, they have limited space in the transverse direction of the bar, which makes it possible to limit the increase in the level of the floor 31 relative to the frame 10 in the lowered state of the work platform 30.
    In addition, as can be seen in FIG. 3, the configuration of the horizontal supports 22 of the box 21 and of the beams of the floor structure 31 which serve for mounting the force sensors 41 to 44 advantageously allows direct mounting between them. without the force sensors 41 to 44 in the event that it is not desired to equip the lifting platform 1 with a system for determining the load of the platform.
    This can in particular be envisaged in the case of an elevating basket 1 with a working platform 30 of small surface which can for this reason escape the normative constraint of being provided with a weighing system.
    As a variant, it is possible to have recourse to any other type of suitable force sensors such as compression sensors or even S-shaped test body sensors, the latter being however more bulky, or else electromagnetically compensated sensors. which are however more expensive.
    The sensors 41 to 44 can be analog sensors, that is to say that do not include integrated electronics, or, on the contrary, digital sensors, that is to say that integrate in the test body a electronic conditioning of the signals of the measuring cell formed by the strain gauges.
    In both cases, the sensors include an electrical or other connection to output the measurement signals from the sensor to an on-board electronics of the lifting platform 1.
    12 The on-board electronics of the lifting platform 1 calculates the load on board the work platform 31 from the sum of the algebraic measurements of the four force sensors 41 to 44 which substantially corresponds to the total weight of the platform -working form 30 loaded.
    Indeed, the sum of the algebraic measurements of the four force sensors 41 to 44 corresponds substantially to the weight despite the cantilever mounting, and therefore due to the fact that the force sensors 41 to 44 do not "see" only the weight of the loaded work platform 30, but also the forces resulting from the moments associated with the weight of the work platform 30.
    This is due to the fact that each force sensor 41 to 44 only measures the force exerted on its support interface in the vertical direction when the lifting platform is placed on a substantially horizontal ground, which is the usual condition. use of such a lifting platform.
    An example of measurement is illustrated by Figure 6 where the weight of the loaded work platform 30 is denoted F and applies to the center of the floor 31.
    Due to the cantilever mounting of the working platform 30, the force sensors 41, 43 on the one hand and the sensors 42, 44 on the other hand are urged in the opposite direction, that is to say in tension. for the first and in compression for the second.
    In this example, the force sensors 41, 43 are subjected together to a vertical force F2, each supporting half of the fact that the weight F is centered in this case.
    Similarly, the force sensors 42, 44 are together subjected to a vertical force Fi which is oriented in the opposite direction of the force F2, each supporting half.
    The algebraic sum Fi + F2 substantially corresponds to the weight F in accordance with the laws of statics.
    Furthermore, provision can be made for the upper rear part 35c of the fixed part 35a of the guardrail 35 to be in sliding contact against the box 21 so as to support the work platform 30, and therefore limit its bending in because of its cantilever mounting.
    This advantageously makes it possible to adopt a less rigid structure for the floor 31, and therefore less heavy.
    The sliding contact avoids disturbing the determination of the load of the work platform 30 from the measurements of the force sensors 41 to 44 since the force sensors 41 to 44 support substantially all of the weight of the platform. work form 30 loaded despite this sliding contact.
    The on-board electronics of the lifting platform 1 are designed to be able to implement a calibration procedure so as to be able to determine the load on board the work platform 30.
    Then, in use, the on-board electronics can be provided to inhibit the lifting of the work platform 30 or to limit the lifting speed thereof depending on the magnitude of the load on board the platform. -work form 30 which it determines on the basis of the signals received from the force sensors 41 to 44.
    In particular, it can be provided to inhibit the lifting of the work platform 130 if the load exceeds a first predetermined threshold.
    It can be provided to limit the lifting speed of the work platform 30 if the load exceeds a second predetermined threshold lower than the first.
    A display may also be provided on the control console on board the work platform 30 which indicates the level of the load, for example in the form of a bar graph.
    FIG. 7 illustrates a variant of the first embodiment in which the force sensors 41, 42 have the same first test body in the form of a bar and the force sensors 43, 44 have the same second test body in the form of a bar distinct from the first test body.
    The test body common to the force sensors 41, 42 is referenced 50 in FIG. 7, the other not being visible.
    FIG. 8 specifically illustrates the test body 50 of the force sensors 41, 42, it being specified that that of the force sensors 43, 44 is identical.
    As can be seen, the planar surface of the support interface 41a of the force sensor 41 is located in a region of a first longitudinal end of the upper face of the bar while the planar surface of the support interface 42a of the force sensor 42 is located in a region of a second longitudinal end of the upper face of the bar, the second longitudinal end being opposite the first longitudinal end.
    Furthermore, the bar has a surface forming a mounting interface 51 on the underside of the bar for mounting the bar on the horizontal support 22 of the box 21.
    The bar also has holes for fixing to the beam 32 of the floor 31 of the work platform 30 and to the horizontal support 22 of the box 21 of the mast 20.
    The operation is identical to the first embodiment.
    However, this variant is advantageous because of the relative positioning of the support interfaces 41a, 42a provided by the test body 50.
    Therefore, the upper surface 23 of the horizontal support 22 can be machined less precisely, or even not be machined at all, compared to the case where each force sensor 41 to 44 has its own test body.
    FIG. 9 illustrates a second embodiment in which the lifting platform 30 is a lifting platform with a telescopic mast.
    In this case, the angle of inclination of the mast - not shown - with respect to the frame of the lifting platform can be modified.
    The mast can also comprise sections articulated between them around a horizontal axis so as to be able to fold up and unfold.
    In this case, the lifting platform comprises a pendulum arm 120 which is articulated by an end 120a to the upper end of the mast, not shown.
    The other end of the pendulum arm 120 supports a work platform 131 from the middle of a long side of the work platform 130 through a weighing system which is similar to the first embodiment. .
    Only the force sensors 41, 42 are visible in FIG. 9.
    However, unlike the first embodiment, the force sensors are placed not under the floor 131, but, viewed in orthogonal projection on a plane corresponding to the floor 131 of the work platform 130, at the exterior of floor 5 131.
    In this case, each lateral pair of force sensors is mounted on a common beam or a respective beam supporting the floor 131 and which extends out of the floor 131 on the side towards the pendulum arm 120.
    The support interfaces of the force sensors can be placed, seen in orthogonal projection on a plane corresponding to the floor 131, at the vertices of a rectangle or of a square as in the first embodiment.
    Alternatively, if each side pair of force sensors is placed on a respective beam extending obliquely with respect to the long side of the floor 131 instead of perpendicularly, and symmetrically with respect to each other, then a placement of the support interfaces at the vertices of an isosceles trapezoid in correspondence with the direction of extension of these two beams is advantageous from the point of view of the simplicity of mounting of the force sensors on these beams.
    Except for what has just been mentioned, all the rest of the description given of the first embodiment is applicable to the second embodiment.
    FIG. 10 illustrates a third embodiment which differs from the second embodiment of FIG. 9 only by the mounting of the force sensors 41 to 44.
    Here, the bars of the force sensors 41 to 44 extend perpendicular to the floor 131 instead of parallel to it as was the case in the first embodiment and in FIG. 9.
    Thus, the flat surfaces of the support interfaces of the sensors 41 to 44 extend perpendicularly to the floor 131 instead of parallel to the latter.
    In other words again, when the floor 131 is in a horizontal position, the bars of the force sensors 41 to 44, as well as the flat surfaces of their support interfaces, extend vertically instead of horizontally.
    Taking into account the mounting of the force sensors behind the floor 131, on the outside thereof, the fact of placing the bars perpendicular to the floor 131 of the work platform 130 advantageously provides a saving of space between the floor. work platform 130 and the end of the pendulum arm 120 which supports it.
    The embodiments of FIGS. 9 and 10 are susceptible of numerous variations.
    According to a first variant, they may be lifting platforms with a telescopic mast which can be tilted relative to the frame of the lifting platform, but which does not have a pendulum arm 120.
    In other words, the work platform 130 is supported directly by the upper end of the telescopic mast through the force sensors.
    According to a second variant, the lifting platform is a lifting platform with a vertical fixed mast.
    As in the case of the first embodiment, the fixed vertical mast is extendable by means of a plurality of boxes which fit together and slide between them in the vertical direction and the mast supports the work platform by means of the 5 upper box.
    But unlike the first embodiment, the lifting structure further comprises the pendulum arm 120, one end of which is articulated to the upper box of the vertical fixed mast and an opposite end supports the work platform 130.
    According to a third variant, each pair of force sensors share the same test body as in the case of the variant of FIGS. 7 and 8 described for the first embodiment.
    More generally, the present invention is not limited to the examples and to the embodiment described and shown, but it is susceptible of numerous variants accessible to those skilled in the art.
    Thus, it is conceivable to use only three force sensors instead of four.
    For example, in the first embodiment, the sensors 42, 44 can be replaced by a single force sensor placed between a horizontal support arranged at the front of the box 21 and a beam of the structure forming the floor 31 of the work platform 30.
    A similar approach is conceivable for the two other embodiments.
    On the contrary, it can also be envisaged to have recourse to more than four force sensors.
    However, the use of four force sensors is preferred in terms of cost and quality of maintenance of the work platform.
    On the other hand, if in the embodiments described, the support interfaces 41a to 44a of the force sensors 41 to 44 serve to support the work platform while the mounting interfaces 42b or 50 serve to mount the sensor. force on the lifting structure, their role can be reversed.
    In other words, for one, more or all of the force sensors 41 to 44, provision may be made for the own support interface to serve the support of the sensor concerned by the lifting structure while its mounting interface 42b or 50 is used for the support. mounting the force sensor
    权利要求:
    Claims (21)
    [0001]
    CLAIMS 1. Lifting platform (1), comprising - a working platform (30; 130) comprising a floor (31; 131) and a guardrail (35), - an lifting structure for moving the working platform in height (30; 130), the lifting structure comprising an extendable mast (20) through which the working platform (30; 130) is supported, the lifting structure supporting the working platform only from one side (36). ) of the work platform, and - at least three force sensors (41 to 44) interposed between the lifting structure and the working platform through which the lifting structure fully supports the weight of the platform - form of work (30; 130), in which: - the force sensors (41 to 44) are arranged in a fixed spatial relationship between them, - the force sensors (41 to 44) are arranged so that, in orthogonal projection on a plane corresponding to the floor of the work platform, the force sensors are t all located on the same side of a center line (Y) of the floor (31; 131) of the work platform which is the one located towards the side (36) of the work platform (30; 130) by which it is supported by the lifting structure, and - each of the force sensors ( 41 to 44) is intended to measure the force exerted on it only in the vertical direction by the work platform (30; 130) when the floor (31; 131) of the work platform extends horizontally .
    [0002]
    2. Lifting platform according to claim 1, wherein: - the force sensors (41 to 44) each have their own support interface (41a to 44a) for supporting the work platform (30; 130) or for be supported by the lifting structure (30; 130), and - each of the force sensors (41 to 44) is designed to measure the force exerted only in the vertical direction by the work platform (30; 130) on its support interface (41a to 44a) when the floor (31; 131) of the work platform extends horizontally or to measure the force exerted only in the vertical direction by its support interface (41a to 44a ) 17 on the lifting structure when the floor (31; 131) of the working platform extends horizontally.
    [0003]
    3. 5
    [0004]
    4. 10 15
    [0005]
    5. 20
    [0006]
    6.25
    [0007]
    7. 308. 9. 35 Lifting platform according to claim 2, in which the force sensors (41 to 44) are distributed so that, in an orthogonal projection on a plane, the support interfaces occupy the vertices of a plane. polygon. An elevating platform according to claim 2 or 3, wherein the lifting structure supports the working platform (30; 130) from the middle of one side of the working platform and the force sensors (41 to 44). ) or the support interfaces (41a to 44a) of the force sensors (41 to 44) are arranged symmetrically with respect to a median plane (X) of the floor (31; 131) of the work platform which is perpendicular to said center line (Y). An elevating platform according to any one of claims 2 to 4, wherein the support interface (41a to 44a) of each force transducer (41 to 44) comprises a planar support surface, the planar support surfaces of the interfaces. support of the force sensors being coplanar. An elevating platform according to any one of claims 2 to 5, wherein the support interface (41a to 44a) of each force sensor (41 to 44) comprises a planar support surface extending parallel to the floor (31 ; 131) of the work platform. An elevating platform according to any one of claims 2 to 5, wherein the support interface (41a to 44a) of each force sensor (41 to 44) comprises a planar support surface extending perpendicular to the floor (131). ) of the work platform. Lifting platform according to any one of claims 1 to 7, in which the force sensors (41 to 44) are arranged under the floor (31). Lifting platform according to any one of claims 1 to 7, in which, viewed in orthogonal projection on a plane corresponding to the floor (131) of the work platform, the force sensors (41 to 44) are arranged at outside the floor. 18 10. Lifting platform according to any one of claims 2 to 9, wherein at least two of the force sensors (41, 42) are based on strain gauges arranged on or in a common test body (50 ), the support interface (41a, 42a) of each of these two sensors forming part of the common test body. 11. An elevating platform according to claim 10, wherein the common test body (50) is in the form of a bar comprising two opposite longitudinal ends, the support interface (41a) of one of the two force sensors. being arranged in a region towards one of the longitudinal ends and the support interface (42a) of the other of the two force sensors being arranged in a region towards the other longitudinal end. 12. Lifting platform according to any one of claims 2 to 11, wherein the force sensors (41 to 44) are four in number, the support interfaces 15 (41a to 44a) of the four force sensors ( 41 to 44) being preferably arranged, in orthogonal projection on a plane, along the vertices of a square, a rectangle or an isosceles trapezoid. 13. Lifting platform according to claim 12, in which: - two of the force sensors (41, 42) are based on strain gauges arranged on or in a first common test body (50) in the form of a bar. , the support interface (41a, 42a) of each of these two sensors (41, 42) forming part of the first test body, and - the other two force sensors (43, 44) are based on gauges of constraints 25 arranged on or in a second common test body separate from the first test body (55), the support interfaces (43a, 44a) of each of these two other sensors (43, 44) forming part of the second test body. 14. An elevating platform according to any one of claims 1 to 13, wherein the extendable mast (20) is a fixed vertical mast, the mast being extendable by means of a plurality of boxes which fit together and slide between them. in the vertical direction, the mast supporting the work platform through the upper box to which the work platform is rigidly mounted through the force sensors (41 to 44). 15. An elevating platform according to claim 14, wherein the upper part of the guardrail is in sliding contact (35c) against the vertical wall of the upper box (21) to support the work platform. 16. An elevating platform according to claim 14 or 15, wherein the upper box (21) of the mast has supports (22) projecting on at least two opposite sides of the box, the force sensors (41 to 44) being. fixed on said supports. 17. An elevating platform according to claim 16 in that it depends on claim 13, wherein the first test body (50) is fixed on one of the supports (22) and the second test body is. fixed on the other support. 18. Lifting platform according to claim 17, wherein said supports (22) are horizontal, the first and second test bodies being placed between the floor (31) of the work platform and the horizontal support (22). corresponding to the upper box (21) while lying horizontally between them. 19. Lifting platform according to any one of claims 1 to 13, in which: - the extendable mast (20) is a fixed vertical mast, the mast being extendable by means of a plurality of boxes which fit together and slide. between them in a vertical direction, the mast supporting the work platform through the upper box, the lifting structure further comprising a pendulum arm (120), one end of which is articulated to the upper box (21) of the vertical fixed mast ( 20) and an opposite end supports the work platform (130); or else - the extendable mast is a mast which can be tilted relative to a frame supporting the lifting structure, the mast optionally comprising sections articulated between them. 20. An elevating platform according to any one of claims 1 to 19, wherein the elevating structure supports the work platform through a narrow side (36) of the work platform (30). 21. An elevating platform according to any one of claims 1 to 20, further comprising an electronic processing device for determining the load placed on the platform from the force measurements provided by the force sensors (41). to 44).
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    同族专利:
    公开号 | 公开日
    EP3870531A1|2021-09-01|
    AU2019363868A1|2021-05-27|
    CN112969658A|2021-06-15|
    US20210354967A1|2021-11-18|
    FR3087761B1|2020-11-06|
    FR3087762A1|2020-05-01|
    CA3116509A1|2020-04-30|
    引用文献:
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    WO1999011557A1|1997-09-02|1999-03-11|Crown Equipment Corporation|Motor cover for a work assist vehicle|
    FR2808791A1|2000-05-11|2001-11-16|Pinguely Haulotte|TELESCOPIC STRUCTURE AND LIFTING BOAT EQUIPPED WITH SUCH A STRUCTURE|
    EP1382562B1|2002-07-19|2005-05-11|MOBA - Mobile Automation AG|Load measuring device|
    WO2017177219A1|2016-04-08|2017-10-12|Jlg Industries, Inc.|Platform load sensing system|
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    CN112645257A|2020-12-30|2021-04-13|大连四达高技术发展有限公司|Multi-level telescopic protection sliding table system for involution of tail wings|
    法律状态:
    2019-10-24| PLFP| Fee payment|Year of fee payment: 2 |
    2020-05-01| PLSC| Publication of the preliminary search report|Effective date: 20200501 |
    2020-10-23| PLFP| Fee payment|Year of fee payment: 3 |
    2021-10-27| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1859975A|FR3087762A1|2018-10-26|2018-10-26|WEIGHING SYSTEM FOR WORK PLATFORM OF A MAT LIFT PLATFORM|
    FR1859975|2018-10-26|CA3116509A| CA3116509A1|2018-10-26|2019-10-24|Weighing system for a working platform of an aerial lift having a mast|
    PCT/IB2019/059125| WO2020084561A1|2018-10-26|2019-10-24|Weighing system for a working platform of an aerial lift having a mast|
    US17/286,941| US20210354967A1|2018-10-26|2019-10-24|Weighing system for a working platform of an aerial lift having a mast|
    CN201980072854.1A| CN112969658A|2018-10-26|2019-10-24|Weighing system for a work platform of an aerial work platform with a mast|
    AU2019363868A| AU2019363868A1|2018-10-26|2019-10-24|Weighing system for a working platform of an aerial lift having a mast|
    EP19798133.5A| EP3870531A1|2018-10-26|2019-10-24|Weighing system for a working platform of an aerial lift having a mast|
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