• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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    • 专利摘要:
    COUPLING ASSEMBLY TO COUPLY A FIRST ELEMENT TO A SECOND ELEMENT TO TRANSFER LINEAR COMPRESSION AND / OR TRACTION FORCES, AND, METHOD FOR CALIBRATING AN IN SITU FORCE TRANSDUCER IN A FORCE TESTING MACHINE. A force applicator assembly (10; 10 ') is described to calibrate a force transducer in situ (or load cell) (104) on a force application test machine (load) (125). The force applicator (10) includes a stationary member (22; 22 ') configured to be attached to a fixed structure, a movable member (20; 20'), a load cell (12) operatively coupled to one end of the member mobile (20; 20 '); and a differential screw assembly (24; 24 ") connecting the movable member (20; 20 ') to the stationary member (22; 221). a coupling assembly (14) can be used to ensure that only tensile or compression loads The coupling assembly (14) can be configured if desired in such a way that no tensile or compression loads can be applied. A method for calibrating a force transducer in situ (104) on a force applying test machine (205) is also provided and uses a power generator (16; 16 '; 125) and the coupling assembly (14).
    公开号:BR112016007520B1
    申请号:R112016007520-0
    申请日:2014-10-07
    公开日:2021-01-26
    发明作者:Bradley D. Schulz；Paul M. Krueger
    申请人:Mts Systems Corporation；
    IPC主号:
    专利说明:

    FUNDAMENTALS
    [001] The discussion below is given for general historical information only and is not intended to be used as an aid in determining the scope of the claimed matter.
    [002] Force measurement transducers require periodic calibration by comparing the transducer under test with a standard reference transducer. Calibration must be done over a range of incremental forces, according to international standards. In many cases, the test machine to perform the test can be used as the force applicator for calibration purposes; however, in some situations this is not possible or the resulting accessory needed to perform the calibration introduces an unacceptable error.
    [003] In such a case, an electrodynamically driven material testing system has the unique characteristic that its short-term dynamic force capacity exceeds its static force. Its nominal dynamic force can be maintained for a shorter duration than required for calibration. Therefore, an alternative means of applying force is required to reach the full range.
    [004] WO 2011/012182 A1 discloses a test bench with an apparatus for calibrating a force measuring device. The edges of the knife 11 in a lever arm 3 are used to transfer force to the knife supports 12 in a fork 10.
    [005] WO 82/02949 discloses a control installation to determine the strength of the concrete. A spherical joint is used to connect live components only while allowing a small rotation between those components.
    [006] U.S. Patent No. 1,332,491 discloses a portable testing machine that uses screws with different thread pitches.
    [007] In other systems, the controller or control system is not able to perform the necessary test for calibration. Likewise, the structure of some systems does not allow IN SITU calibration. For those machines that allow IN SITU calibration, the currently used coupling and accessory arrangement technologies are not accurate enough for the latest high precision standards that must be met. Although methods and devices have been used to apply external loads, they have been shown to be unable to produce repeatable results with high precision. SUMMARY
    [008] This summary and this summary are given to present a selection of concepts in a simplified form which are further described below in the detailed description. This summary and the summary are not intended to identify key or essential aspects of the claimed matter, nor are they intended to be used as an aid in determining the scope of the claimed matter. The claimed matter is not limited to implementations that resolve any or all of the disadvantages noted in the background.
    [009] A first described aspect is a force applicator set to calibrate a force transducer (or load cell) IN SITU in a force applying test machine (load). The force applicator includes a stationary member configured to be attached to a fixed structure, a movable member, a load cell operatively coupled to one end of the movable member and a differential screw assembly connecting the movable member to the stationary member.
    [0010] A second aspect described is a force applicator set to calibrate a force transducer (or load cell) IN SITU in a force application test machine (load). The force applicator includes a reaction frame having a base configured to be mounted close to the IN SITU force transducer. A vertical support is attached to the base and a crosshead is attached to the vertical support. A stationary member is attached to the crosshead. A set of differential screw connects a movable member to the stationary member.
    [0011] One or more of the following characteristics can be included in each of the above aspects as desired, if not otherwise given, to provide other modalities.
    [0012] The differential screw assembly may include a rotating member threadedly connected to the movable member with a first series of thread threads having a first thread pass. The rotating member is also screwed to the stationary member with a second series of thread threads having a second thread pass, the second thread pass being different from the first thread pass. The movable member may comprise a threaded rod, while the rotating member may comprise a tube having a threaded hole comprising the first series of thread threads. In this embodiment, the tube has an external surface having the second series of thread threads that are threadedly connected to the stationary member. In another embodiment, each of the movable member and the stationary member comprises threaded rods that are aligned with each other. The rotating member engages the thread threads of each of the threaded rods. Rotation of the rotating member causes linear movement of the threaded rod of the movable member in relation to the threaded rod of the stationary member
    [0013] An anti-rotation device can be provided that is connected to the stationary member and is connected to the mobile member and configured to inhibit at least the rotation of the mobile member, or rotation of both the stationary member and the mobile member. The anti-rotation device may be a recess formed in the movable member and a pin attached to the stationary member and extending into the recess. Likewise, the anti-rotation device can be a recess formed in the stationary member and a pin attached to the movable member and extending into the recess. Each recess can act as a guide for the pin.
    [0014] The first aspect may also include a reaction frame having a base configured to be mounted close to the IN SITU force transducer. A vertical support is attached to the base and a crosshead is attached to the vertical support. The stationary member is attached to the crosshead.
    [0015] In another embodiment, a coupling set can be operatively connected to the movable member. The coupling assembly has a remote distal end of the movable member. The coupling assembly is configured to align an axis of the movable member with an axis of the distal end when forces are transferred from the coupling assembly.
    [0016] Another aspect described is a coupling assembly for coupling a first element to a second element to transfer linear forces of compression and / or traction. The coupling assembly includes a retainer assembly connectable to the first element having a first member having a first curved three-dimensional surface and a second member having a second curved three-dimensional surface spaced from, and facing, the first curved three-dimensional surface. A reaction structure is connectable to the second element and is arranged between the first and the second curved three-dimensional surfaces. A reaction structure has a spacing between the first and the second curved three-dimensional surfaces such that the reaction structure contacts only one of the first or the second three-dimensional surfaces when transmitting forces between them.
    [0017] One or more of the following characteristics can be included in each of the first, second and third aspects above as desired, if provided otherwise, to provide other modalities.
    [0018] The coupling set can be used to connect the movable member to the load cell, while the distal end is configured to be connected to the IN SITU force transducer.
    [0019] The retainer assembly may include at least one orifice, the reaction structure extending through the orifice. If desired, two opposite orifices can be provided, the reaction structure extending through each of the orifices. Each of the first and second curved three-dimensional surfaces may comprise at least one partial sphere. A reaction structure may include opposed concave surfaces, each concave surface engaging one of the curved three-dimensional surfaces.
    [0020] Another aspect described is a method for calibrating an IN SITU force transducer on a force applying test machine. The method includes mounting a reference load cell and a coupler in order to obtain a load path between a force generator (for example, force applicator described above or a force generating device on the testing machine such as an actuator) and the IN SITU force transducer, the coupling assembly comprising a reaction structure and a first member configured to selectively engage one side of the reaction structure and a second member configured to selectively engage one side of the reaction structure that faces a direction opposite to said one side; and operating the force generator so as to configure a first space between the first member and the reaction structure and also a second space between the second member and the reaction structure. Any of the previous features described above can be used in the method as desired. BRIEF DESCRIPTION OF THE DRAWINGS
    [0021] Fig. 1 is a perspective view of a force applicator assembly.
    [0022] Fig. 2 is a perspective view of the force applicator assembly mounted on a test machine having a load cell.
    [0023] Fig. 3 is a sectional view of the force applicator assembly.
    [0024] Fig. 4A is a plan view of a coupler for transferring forces.
    [0025] Fig. 4B is a sectional view of the coupler taken along lines 4B-4B in Fig. 4A.
    [0026] Fig. 5 is a perspective view of a portion of the force applicator assembly.
    [0027] Fig. 6 is a perspective view of a portion of the force applicator assembly with removed portions.
    [0028] Fig. 7 is a sectional view of a force applicator assembly without a reaction frame.
    [0029] Fig. 8 is a schematic view of a second modality of a force applicator assembly.
    [0030] Fig. 9 is a schematic view of the second modality of the force applicator. DETAILED DESCRIPTION OF ILLUSTRATIVE MODALITIES
    [0031] Aspects of the invention include, but are not limited to, a precision force applicator assembly having a force applicator 10 to generate precision forces on a load cell 12, here a reference standard; however, the specific type of load cells described here is not part of the invention. An innovative coupler or coupling assembly 14 is also illustrated in the figures and can be used to couple forces between the force applicator 10 and the load cell as described below. The force applicator 10 includes an actuator 16, which is typically supported in order to apply loads to the load cell 12 (and a load cell under test 102 in Fig. 3) by a reaction frame 18.
    [0032] With reference to Figs. 3 and 6, the actuator 16 includes a movable member 20, illustrated here as an actuator stem that moves with respect to a stationary member 22, embodied here as a support tube. A differential screw assembly 24 engages the movable member 20 with the stationary member or support 22 and causes the movable member 20 to be displaced therefrom by rotation of a rotating force-receiving member 26. The differential screw assembly 24 includes the member force receiver 26 which is threadedly coupled to the movable member 20 with a first series of thread threads 30 having a first thread pass. The force receiving member 26 is further threadedly coupled to the stationary member 22 with a second series of thread threads 32 having a second thread pass, the second thread pass being different from the first thread pass. Both the movable member 20 and the stationary support 22 are inhibited against rotation. When the force receiving member 26 is rotated, the movable member 20 moves in relation to the stationary support 22 by an amount equal to the differential between the first and the second thread steps. The result is a very small translation of movement from the movable member 20 to a relatively large amount of rotation of the force receiving member 26; thus, the force applicator 10 can provide selected forces with high precision and repeatability. The first thread can be coarser than the second thread, or the second thread can be coarser than the first thread. In an exemplary modality, the difference in thread fillets can be in the range of 2.54 μm to.20.32 μm. Said in terms of operation of the force receiving member 26 and not necessarily correlated with the previous range given, in an exemplary embodiment the rotation of the force receiving member 26 from no load to full load can be in the range of ^ turn (no load to full load) at 10 turns (no load to full load).
    [0033] In the illustrated embodiment, the force receiving member 26 includes a shaft 40 having an inner hole 42 that includes the first series of thread threads 30. An outer surface 44 of the tree 40 includes the second series of thread threads 32. The shaft 40 is rotated to cause translation of the movable member 20 due to the pitch difference between the first series of thread threads 30 and the second series of thread threads 32. At least one cable extending radially 46 is attached to an end 48 of the tree 40. In the illustrated embodiment, an enlarged button member button 50 couples the cable 46 to the tree 40. The tree 40 extends through a central hole 52 provided in the button 50. The end 48 of the tree includes a extended flange 54 which is fixed to button 50 with appropriate fastener (s) such as threaded pin (s) 56.
    [0034] Being fixed to the tree 40, the button 50 will rotate as well as move axially along a central axis 60 in relation to the stationary support 22. The button 50 includes an enlarged center 70 therein with an access hole 72. An end 74 of stationary member 22 extends into recess 70 through access hole 72, while tree 40 extends through recess 70 and out of access hole 72 and into stationary member 22, here comprising a tube. The outer walls 76 of the button 50 forming the recess 70 inhibit contaminants from reaching the second series of thread threads 32, while the first series of thread threads 30 are sealed against contaminants from the movable member 20 being disposed in the hole 42 and wherein an elongated bushing 80 seals a second end 84 of the tube 22, while providing a stable guide surface for the movable member 20, which extends into a hole of the stationary member 22. In the illustrated embodiment, the bushing 80 is secured to the end 84 of the tube 22 with the appropriate fastener (s) exemplified here as threaded pin (s) 88.
    [0035] An anti-rotation member 90 is provided to inhibit rotation of the movable member 20. Generally, the anti-rotation member 90 is operatively coupled to the movable member 20 and a stationary member. In the embodiment illustrated in Fig. 6, the anti-rotation member 90 comprises an extended element such as a pin 90 which is attached to stationary support 22. Here, pin 90 is threadedly mounted on stationary support 22. A portion 92 of pin 90 extended into an enlarged slot or recess 94 of the movable member 20. The recess 94 is configured to receive the pin 90 and inhibit rotation of the movable member 20 due to the pin 90 contacting the inner radial walls of the recess 94, while allowing movement of translation of the movable member 20 with respect to the stationary pin 90 for a limited distance. A suitable lubricant can be provided between the pin 90 and the walls of the recess 94 to minimize friction for translation movement of the movable member 20.
    [0036] Fig. 7 illustrates a modality that does not include the reaction frame 18, where instead the crosshead of the test machine or original (mobile or stationary) or another element such as the actuator assembly or other portion of the frame of the Test machine 205 comprises the reaction structure, any of these elements being the element on which the force applicator 10 is mounted.
    [0037] Fig. 9 illustrates a force applicator 10 'which also includes a first series of thread threads having a first thread pitch 30' and a second series of thread threads 32 'having a second thread pitch in one differential bolt assembly 24'.A rotating member receiving force 26 'includes a rotating shaft 40' having a threaded hole 42 '(here with two threads) to form an actuator 16'. In the illustrated embodiment, the rotating tree 40 'is solidary, being formed from a single unitary body. As appreciated by those skilled in the art, the 40 'tree can be formed from separate parts which are then joined together.
    [0038] A movable member 20 'comprises a threaded rod. In operation, a threaded rod 101 comprises the stationary member and is attached to a reaction structure such as either the frame 18 or a part of the original testing machine as illustrated in the exemplary embodiment of Fig. 8. The rotation of the tree 40 'makes the threaded rod 20 'moves downwards due to the difference in thread pitch. An anti-rotation device inhibits rotation of the movable member 20 'and here comprises a coupling 103 between the movable member 20' and the rod 101 which inhibits rotation of the movable member 20 '. Coupling 103 comprises a pin and guide coupling in which pin (s) 105 is (are) connected to one of the movable member 20 'or rod 101 (here for example the movable member 20' with a portion 107 extending up into a hole 109 provided in the stem 101), while the guide or recess 111 is provided in the other (here the stem 101).
    [0039] Aspects of the coupler 14 will now be described. It should be noted that the coupler 14 can provide advantageous features when used with the force applicator 10, but use of the coupler 14 is not required where the force applicator 10 can be used without the coupler 14 if desired.
    [0040] The coupler 14 is operatively connected (directly or indirectly) to the movable member 20 and has a remote distal end 14A of the movable member 20. The coupler 14 aligns the central axis 60 of the movable member 20 so that it is aligned with a central axis 100 of a load cell 102 that is being calibrated or configured to align an axis of the movable member 20 with an axis of the distal end 14A when forces are transferred through the coupler 14. In other words, the coupler 14 minimizes any deviation that may exist between axes 60 and 100, which would cause the force applicator to apply a super-moment to the load cell 102. In the embodiment of Fig. 3, the load cell 102 is fixedly coupled to the load cell reference 12 which in turn is coupled to the movable member 20 via the coupler 14. An interface coupling 106 ensures that the load cell 12 is properly aligned with the load cell 102. In the illustrated embodiment, the ac The interface device 106 includes a pin 108 and spiral washers 110.
    [0041] Generally, the 14 includes a force reaction structure 120 operatively coupled to the movable member 20, 20 'or to the stationary member 22. A reaction structure 120 can be connected to the movable member 20, 20'. A reaction structure 120 is arranged between reaction members 122A and 122B, each having a three-dimensional curved surface that selectively engages reaction structure 120 depending on the direction of force being transferred through the coupler 14. In the illustrated embodiment, the three-dimensional curved surface on the reaction members 122A and 122B it comprises partial spherical balls.
    [0042] A retainer 126 supports each of the reaction members with a three-dimensional curved surface 122A and 122B (here below “three-dimensional curved member”) that face each other on opposite sides of the reaction structure 120. In the illustrated embodiment, the three-dimensional curved member 122A is attached to retainer 126 with a suitable fastener such as a threaded pin 128. A reaction structure 120 extends through holes 130 in retainer 126 on opposite sides of it. In the exemplary embodiment, the retainer 126 includes a cylindrical portion 134 having the holes 130. The first three-dimensional curved member 122 is attached to the cylindrical component 134, being disposed in a recess 140 thereof. The second curved three-dimensional surface member 122B is attached to a cap member 144 which in turn is attached to an end 146 of the cylindrical portion 134 with appropriate fastener (s) here comprising threaded pin (s) 148 .
    [0043] A reaction structure 120 selectively engages and rests against one of the three-dimensional curved members 122A or 122B in order to transfer force to the load cell 102 under test. In particular, with respect to the modalities of Figs. 3 and 7, a compressive force is applied to the load cell 102 under test by moving the movable member 20 downwards in such a way that the reaction structure 120 engages the three-dimensional curved member 122A. In contrast, a tensile force is applied to the load cell 102 when the movable member 20 moves upwards so that the reaction structure 120 engages the three-dimensional curved member 122B.
    [0044] In one embodiment, the distance between the three-dimensional curved member 122A and 122B is greater than the width of the reaction structure 120 and configured with the difference in the thread pitch between the first series of thread threads 30 and the second series thread threads 32 such that substantial angular movement of the tree 24 is necessary so that the reaction structure 120 disengages or frees itself from one of the three-dimensional curved members 122A, 122B until it engages the other three-dimensional curved member 122A, 122B. In a particularly advantageous embodiment, a quasi revolution or multiple revolutions of the tree 124 are necessary in order to move the movable member 20 such that the reaction structure 120 disengages from one of the three-dimensional curved members 122A, 122B before the reaction structure 120 engage the other three-dimensional curved member 122A, 122B. In this way, highly accurate and repeatable forces can be generated in view of the large angular movement required by the tree 40. In addition, a neutral point can be obtained easily where the reaction structure 120 neither engages the three-dimensional curved member 122A nor the three-dimensional curved member 122B. When multiple revolutions are required for the tree 40 for complete translation of the reaction structure 120 from one of the three-dimensional curved members 122A to the other three-dimensional curved member 122B, the tree 40 can be easily rotated to a position where the reaction structure 120 does not contacts any of the three-dimensional curved members 122A or 122B.
    [0045] Coupler 14 is also illustrated in Figs. 4A, 4B, 5 and 6. In these figures, it is shown that the pair of opposite three-dimensional curved members 122A and 122B carry against the reaction structure 120. Although not shown in the figures, there is a small amount of clearance or space between the curved members 122A, 122B and reaction structure 120. This ensures that only pure traction or pure compression is applied to the load cells 12, 102. In particular, the movable member 20 transfers forces or traction or compression to the reaction structure 120 , which can comprise a seasoned bar. A reaction structure 120, in turn, transfers force to any one of the three-dimensional curved members 122A, 122B. Due to the space between the curved members 122A, 122B and reaction structure 120 it is also easy to configure the force applicator 10, or any force application device such as an actuator assembly, in such a way that clearance or space is provided (o) between the curved members 122A, 122B and the reaction structure 120 in order to obtain an operating state where no force (traction or compression) is being transferred through the coupler 14 since the presence of the space between the curved members 122A, 122B and the reaction structure 120 decoupled the force application device from the element connected to the other side of the coupler 14. In one embodiment, the coupling assembly 14 is configured in such a way that it is easy to see the spaces between the curved members 122A, 122B and the reaction structure 120 when any power generator connected thereto is operated to obtain such spaces. As illustrated in Fig. 4B, the reaction structure 120 may include concave opposite surfaces 131A and 131B each of which receives one of the three-dimensional curved members 122A or 122B.
    [0046] In the embodiment illustrated in Fig. 3, the movable member 20 includes an enlarged end member 160 having a recess or cavity 162 of such size as to receive the cover member 144 and a portion of the retainer 126 connected thereto. The recess or cavity 162 is of such a size that it does not contact any of these parts. A reaction structure 120 is connected to the extended end member 160 with appropriate fastener (s) such as threaded pin (s) 164. An end of retainer 126 opposite the cap member 144 is attached to the control cell. load 102 with an interface support 168 which is secured to retainer 134 with appropriate fastener (s) such as threaded pin (s) 170. 168 is threadedly attached to load cell 104 with a portion 172.
    [0047] In the embodiment of Fig. 7, the support 168 is threadedly coupled to the load cell under test 102, while the reaction structure 120 is attached to a support 190 having the recess or cavity 162. The support 190 is attached to the cell load 12 opposite the movable member 20. Thus, in this configuration, the reaction structure 120 is operatively connected to the movable member 20 directly (Fig. 3) or indirectly through the load cell 12 (Fig. 7) and the retainer is operatively connected to the IN SITU 102 load cell. And in another embodiment, the reaction structure 120 can be operatively connected to the IN SITU 102 load cell and the retainer 126 can be operatively connected to the movable member 20.
    [0048] Fig. 8 illustrates that the coupler 14 can be used in another exemplary calibration situation to calibrate a load cell 102. In this mode the force applicator 10 is not present, but on the contrary it is the machine calibration set test 125 that provides the calibration loads to calibrate the load cell 102.
    [0049] It should be noted that the use of coupler 14 is not limited to calibrating load cells. Coupler 14 can be used in other force application systems, particularly those that require alignment of compression and / or tensile loads between two members. Coupler 14 is unable to transmit significant torque. The first member is connected to the reaction structure 120, while the second member is connected to the retainer 126.
    [0050] With reference to Figs. 1 and 3, the reaction frame 18 includes a base member 200 and a reaction crosshead 202 supported on the base member 200 by vertical support (s) 204. The force applicator assembly is mounted in position to apply force loads to the load cell 102 first by installing the calibration template 12 in the load cell under test 102 with the interface coupling 106. The base 200 is then mounted on the load frame or load machine 205 as shown in Figs. 2 and 8 with the vertical supports 204 connected before mounting the base 200 to the loading machine 205. Then, the force applicator 10 with the cross reaction head 202 attached to it is mounted on the vertical supports 204 here with screw fasteners 230. In one embodiment, the cross reaction head 202 comprises a clamp that is fixedly attached to the stationary support 22 in order to provide coarse positioning of the force applicator 10. In particular, the clamp is first seated in the non-clamped position allowing the force applicator 10 and coupler 14 are rotated and translated by screwing the interface 168 into the load cell 104. Once a secure connection has been established between the coupler 14 and the load cell 104, the force applicator 10 is clamped in the cross reaction head 202. Figs. 5 and 6 illustrate clamping portions 240A and 240B that selectively engage the stationary support 22.
    [0051] Force applicator 10 can be mounted on or on the machine without removing the force transducer or load cell allowing IN SITU calibrations. This allows adherence to international standards for calibrations that require that the transducer is not disturbed. Furthermore, in one embodiment, since the reaction structure 18 is attached to the test machine, such as to the base as illustrated in Figs. 2 or 6, the rest of the test machine and in particular the crosshead of the test machine, which can include the force actuator as shown in Fig. 2, does not need to be used to provide a reaction structure. This independence eliminates the quality of the original machine as a source of error. The modular design allows for easy, step-by-step installation. Modalities can incorporate alignment characteristics that facilitate repeatability, precise installation and results. It should be understood that the assembly of the force applicator in order to perform IN SITU calibration of a load cell or force transducer mounted on the base of the test machine is not limiting. In another application, the force applicator can be operatively connected to an IN SITU load cell that is mounted on an actuator applying loads in any orientation. For example, if the actuator is mounted on the base and the IN SITU load cell is mounted on the actuator, the force applicator can be operatively coupled to the IN SITU load cell. If a reaction structure 18 is required, it can be attached to the actuator or to a support for the actuator in any way. Likewise, if the actuator is mounted on a crosshead, which can be movable as needed to conduct a test and an IN SITU load cell is mounted on the actuator, the force applicator can be operatively coupled to the IN SITU load cell. If a reaction structure 18 is required, it can be attached to the actuator or to a support, such as the crosshead, again for the actuator in any way. When it is desired to test the IN SITU load cell, the force applicator 10 can be operated to obtain the spaces described above between the curved members 122A, 122B and the reaction structure 120 when it is necessary to have a state where no tensile load or compression is being applied.
    [0052] Although the matter has been described in specific language for structural features and / or methodological acts, it should be understood that the matter defined in the attached claims is not necessarily limited to the specific features or acts described above as defined by the courts. On the contrary, the specific characteristics and acts described above are revealed as exemplary ways of implementing the claims.
    权利要求:
    Claims (13)
    [0001]
    1. Coupling assembly (14) for coupling a first element (12; 102) to a second element (20; 20 ') to transfer linear forces of compression and / or traction, comprising: a retainer assembly (126) connectable to the first element (12; 102), the retainer assembly having a first member having a first surface (122A) and a second member having a second surface (122B) spaced from, and facing, the first surface (122A); and, a reaction structure (120) connectable to the second element (20; 20 ') disposed between the first and second surfaces (122A; 122B), the reaction structure (120) and the spacing between the first and second surfaces (122A; 122B) being configured in such a way that the reaction structure (120) contacts only one of the first or second surfaces (122A; 122B) when transmitting forces between them, characterized by the fact that: each of the first and second surfaces (122A; 122B) is a curved three-dimensional surface, where the first and second curved three-dimensional surfaces (122A; 122B) are configured to align an axis (100) of the first element (12; 102) with an axis (60 ) of the second element (20. 20 ') when forces are transferred through the coupling assembly.
    [0002]
    Coupling assembly (14) according to claim 1, characterized in that each of the first and second curved three-dimensional surfaces (122A; 122B) comprises at least one partial sphere.
    [0003]
    Coupling assembly (14) according to either of claims 1 or 2, characterized in that the retaining assembly (126) includes at least one orifice (130), the reaction structure (120) extending through the orifice (130).
    [0004]
    Coupling assembly (14) according to any one of claims 1 to 3, characterized in that the retaining assembly (126) includes opposite holes (130), the reaction structure (120) extending through each the holes (130).
    [0005]
    Coupling assembly (14) according to any one of claims 1 to 4, characterized in that the reaction structure (120) includes opposing concave surfaces (131A, 131B), each concave surface engaging one of the curved three-dimensional surfaces .
    [0006]
    Coupling assembly (14) according to any one of claims 1 to 5, characterized in that the first element comprises a load cell (102).
    [0007]
    Coupling assembly (14) according to claim 6, characterized in that it also comprises a reference load cell (12) aligned with the load cell (102).
    [0008]
    Coupling assembly (14) according to any one of claims 1 to 7, characterized in that the second element comprises a movable member of an actuator (16).
    [0009]
    Coupling assembly (14) according to any one of claims 1 to 8, characterized in that the distance between the curved three-dimensional surfaces is greater than the width of the reaction structure (120), the width being a distance along the axis (60).
    [0010]
    Coupling assembly (14) according to claim 1, characterized in that the retaining assembly (126) includes at least one structure (130), where the reaction structure (120) extends through the orifice, being that a distance between the curved three-dimensional surfaces is greater than the width of the reaction structure (120), the width being a distance along the axis (60), and one or more spacing between the first and second surfaces and the structure reaction points can be seen from a vantage point external to the coupling assembly.
    [0011]
    11. Method for calibrating a force transducer in situ (102) on a force-applying test machine, comprising: assembling a reference load cell (12) and a coupling assembly (14) in order to obtain a path of load between a force generator (10) and the in situ force transducer (104), the coupling assembly (14) comprising a reaction structure (120) and a first member (122A) configured to selectively engage one side of the structure reaction (120) and a second member (122B) configured to selectively engage one side of the reaction structure (120) which faces away from the one side; operating the force generator (10) so as to configure a first space between the first member (122A) and the reaction structure (120) and also a second space between the second member (122B) and the reaction structure (120) ; and, operate the force generator (10) so that the reaction structure (120) contacts only one of the first and second members (122A, 122B), characterized by the fact that it also comprises: aligning an axis (100) of a movable member (20, 20 ') of the force generator (10) with an axis (60) of the force transducer in situ (104) when one of the first and second members (122A, 122B) contacts the reaction structure (120), where the first and second members (122A, 122B) have respective first and second curved three-dimensional surfaces configured to align the axes.
    [0012]
    12. Method according to claim 11, characterized in that it also comprises rotating a differential screw assembly (24) to transfer the movable member, where the differential screw assembly (24) includes a rotating member (26) threadedly coupled to the movable member (20, 20 ') with a first series of thread threads (30) having a first thread pass and where the rotating member (26) is threadedly coupled to a stationary member (22) with a second series of thread threads thread (32) having a second thread pass, the second thread pass being different from the first thread pass.
    [0013]
    Method according to either of claims 11 or 12, characterized in that it further comprises exposing one or more spacings between the first and second surfaces and the reaction structure (120) in order to be viewed from a point of view. advantage external to the coupling set.
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    EP3055660B1|2021-08-04|
    KR20160065861A|2016-06-09|
    CN105593658B|2019-08-20|
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    法律状态:
    2020-06-23| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-24| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-26| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/10/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
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    US201361887753P| true| 2013-10-07|2013-10-07|
    US61/887753|2013-10-07|
    PCT/US2014/059493|WO2015054250A2|2013-10-07|2014-10-07|Precision force applicator for force transducer calibration|
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