Special device for detecting automobile parts

Abstract

The invention discloses a special device for automobile part detection. The special device comprises a machine table, a displacement driving assembly, a fixing clamp and a detection assembly, the displacement driving assembly is installed on the machine table, the fixing clamp is arranged on the displacement driving assembly, and the fixing clamp is used for clamping a pedal to be detected; the detection assembly comprises a base, a movable seat and a plurality of detection plates with different surface roughness, a movable groove is formed in the base, the movable seat is movably installed in the movable groove, a first permanent magnet is arranged on the groove wall of the movable groove, a second permanent magnet is arranged on the end face, right opposite to the first permanent magnet, of the movable seat, and the first permanent magnet and the second permanent magnet are arranged in a repulsive mode; and the detection plate is detachably mounted on the moving seat. The first permanent magnet block and the second permanent magnet block are oppositely arranged, stable damping is provided for the movable seat, meanwhile, the detection plates with different roughness can be rapidly replaced, accurate installation is achieved in cooperation with a positioning mechanism, and the detection efficiency and the result consistency are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts testing technology, and specifically to a special device for testing automotive parts. Background Technology

[0002] In the production and assembly of automotive parts, the pedal, as a crucial component for driving operation, directly impacts the vehicle's handling safety and comfort due to its surface quality and contact characteristics with surrounding mating parts. To ensure the reliable performance of the pedal, it is typically necessary to simulate testing its surface against mating parts under different frictional environments. This includes testing the pedal's sliding resistance, wear trend, and contact stability on surfaces with varying roughness. Currently, industry testing of pedal surface adaptability often employs fixed roughness testing blocks or single-roughness testing fixtures. This requires frequent disassembly and replacement of testing plates according to different testing requirements, resulting in cumbersome operations and low efficiency. Furthermore, the lack of reliable positioning and quick-locking structures after installation makes the testing plates prone to shifting during testing, leading to inconsistent results. Additionally, existing testing devices are inconvenient for adjusting the testing position, hindering accurate testing of different areas or different travel distances of the pedal and limiting testing flexibility. Therefore, there is an urgent need for a dedicated testing device that allows for quick replacement of testing plates with different roughnesses, accurate positioning, and easy adjustment of the testing position to improve the efficiency and accuracy of pedal surface performance testing. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a special device for testing automotive parts. By arranging permanent magnet block one and permanent magnet block two in a positive alignment, a stable damping is provided for the moving seat. At the same time, it can quickly replace the test plate with different roughness and achieve precise installation with the positioning mechanism, thereby improving the testing efficiency and result consistency.

[0004] The technical solution provided by the present invention to solve the above problems is: a special device for testing automotive parts, comprising a machine base, a displacement drive assembly, a fixing fixture, and a testing assembly; The displacement drive assembly is mounted on the machine base, and the fixing fixture is set on the displacement drive assembly. The fixing fixture is used to clamp the foot pedal to be tested. The detection assembly includes a base, a movable seat, and several detection plates with different surface roughnesses. The base is provided with a movable groove, and the movable seat is movably installed in the movable groove. A permanent magnet block one is provided on the groove wall of the movable groove, and a permanent magnet block two is provided on the end face of the movable seat opposite to the permanent magnet block one. The permanent magnet block one and the permanent magnet block two are arranged to repel each other, and the detection plates are detachably installed on the movable seat.

[0005] Preferably, the detection component further includes a positioning mechanism for positioning the detection plate.

[0006] Preferably, the positioning mechanism includes a positioning groove and a plurality of positioning posts. The positioning groove is disposed on the detection plate, the movable seat is provided with a mounting groove for mounting the detection plate, the plurality of positioning posts are disposed at the four corners of the mounting groove, and the detection plate is provided with positioning holes that cooperate with the positioning posts.

[0007] Preferably, the positioning mechanism further includes a vertical positioning component, which is used to vertically position the detection plate.

[0008] Preferably, the vertical positioning component includes a locking module, a permanent magnet block three, a locking rod, and a spring one. The movable base is provided with a movable hole one for the permanent magnet block three to move and a movable hole two for the locking rod one to move. The movable hole one and the movable hole two are connected. The end of the movable hole two away from the movable hole one is connected to the positioning groove. One end of the locking rod is fixedly connected to the permanent magnet block three. The spring one is fitted on the locking rod, with one end abutting against the permanent magnet block three and the other end abutting against the bottom of the movable hole one. The side end face of the detection plate is provided with a locking hole that cooperates with the locking rod. The locking module is installed in the movable base for positioning the locking rod.

[0009] Preferably, the locking module includes a second spring, a fourth permanent magnet, and a fifth permanent magnet. The movable seat is provided with a third movable hole that cooperates with the fourth permanent magnet. One end of the second spring is fixedly connected to the fourth permanent magnet, and the other end is fixedly connected to the bottom of the third movable hole. The fifth permanent magnet is disposed on the wall of the positioning groove. The fourth and fifth permanent magnets are attracted to each other. The locking rod is provided with a locking groove that cooperates with the fourth permanent magnet.

[0010] Preferably, the locking rod is made of a non-magnetic material.

[0011] Preferably, the movable groove is provided with a plurality of guide rods, and the movable seat is provided with a plurality of guide holes that cooperate with the guide rods.

[0012] Preferably, the displacement drive assembly includes a power motor, a slide rail, a lead screw, a fixed base, a support frame, a moving plate, a pneumatic cylinder, an electric actuator, and a fixed plate. The slide rail and the power motor are mounted on the machine base. The fixed base is movably mounted on the slide rail and has a threaded hole that mates with the lead screw. The power motor is connected to the lead screw via a transmission. The support frame is located on the upper surface of the fixed base. The pneumatic cylinder is located on the upper end of the support frame. The support frame has a guide groove that mates with the moving plate. The piston rod of the pneumatic cylinder is connected to the moving plate. The electric actuator is mounted on the moving plate, and the fixing clamp is located at the lower end of the electric actuator.

[0013] Compared with the prior art, the advantages of the present invention are as follows: The detection component of the present invention cooperates with the movable seat through the movable groove on the base, and permanent magnet block one and permanent magnet block two are respectively set on the groove wall and the movable seat. This magnetic structure can provide a continuous and stable damping force for the movable seat. Since the magnetic force is non-contact, the movable seat hardly produces mechanical wear during the sliding process. After long-term use, it can still maintain smooth movement characteristics and reliable positioning effect, which significantly extends the service life of the device. At the same time, detection plates with different surface roughness can be detachably installed on the movable seat. The operator can quickly change the detection plate with the corresponding roughness according to the detection items of the foot pedal without disassembling the entire detection component or preparing multiple devices, which greatly improves the detection efficiency and reduces tooling costs. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the detection component of the present invention; Figure 3 This is a cross-sectional view of the detection component of the present invention; Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0016] Attached diagram labels: 1. Machine base, 2. Power motor, 3. Pneumatic cylinder, 4. Moving plate, 5. Guide groove, 6. Electric push rod, 7. Fixture, 8. Support frame, 9. Fixed seat, 10. Base, 11. Permanent magnet block one, 12. Moving seat, 13. Detection plate, 14. Guide rod, 15. Movable groove, 16. Positioning groove, 17. Permanent magnet block five, 18. Movable hole three, 19. Spring two, 20. Permanent magnet block four, 21. Locking hole, 22. Permanent magnet block two, 23. Locking rod, 24. Permanent magnet block three, 25. Locking groove, 26. Spring one, 27. Movable hole one. Detailed Implementation

[0017] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings and embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0018] In the description of this invention, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. As used in this specification of embodiments of the invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] As shown in the accompanying drawings, a special device for testing automotive parts includes a machine base 1, a displacement drive assembly, a fixing fixture 7, and a testing assembly. The displacement drive assembly is mounted on the machine base 1, and the fixing clamp 7 is set on the displacement drive assembly. The fixing clamp 7 is used to clamp the foot pedal to be tested. The detection assembly includes a base 10, a movable seat 12, and several detection plates 13 with different surface roughness. The base 10 is provided with a movable groove 15, and the movable seat 12 is movably installed in the movable groove 15. A permanent magnet block 11 is provided on the groove wall of the movable groove 15, and a permanent magnet block 22 is provided on the end face of the movable seat 12 opposite to the permanent magnet block 11. The permanent magnet block 11 and the permanent magnet block 22 are arranged in a repulsive manner, and the detection plates 13 are detachably installed on the movable seat 12.

[0024] In another embodiment of the present invention, the detection assembly further includes a positioning mechanism for positioning the detection plate 13. Specifically, the positioning mechanism includes a positioning groove 16 and a plurality of positioning posts. The positioning groove 16 is disposed on the detection plate 13, the movable seat 12 is provided with a mounting groove for mounting the detection plate 13, the plurality of positioning posts are disposed at the four corners of the mounting groove, and the detection plate 13 is provided with positioning holes that cooperate with the positioning posts.

[0025] In this embodiment, the positioning mechanism further includes a vertical positioning component for vertically positioning the detection plate 13. Specifically, the vertical positioning component includes a locking module, a permanent magnet block 24, a locking rod 23, and a spring 26. The movable base 12 is provided with a movable hole 27 for the permanent magnet block 24 to move and a movable hole 23 for the locking rod 23 to move. The movable hole 27 and the movable hole 2 are connected. The end of the movable hole 2 away from the movable hole 1 is connected to the positioning groove 16. One end of the locking rod 23 is fixedly connected to the permanent magnet block 24. The spring 26 is fitted onto the locking rod 23, with one end abutting against the permanent magnet block 24 and the other end abutting against the bottom of the movable hole 27. The side end face of the detection plate 13 is provided with a locking hole 21 that cooperates with the locking rod 23. The locking module is installed in the movable base 12 for positioning the locking rod 23.

[0026] The locking module includes a second spring 19, a fourth permanent magnet 20, and a fifth permanent magnet 17. The movable base 12 has a third movable hole 18 that mates with the fourth permanent magnet 20. One end of the second spring 19 is fixedly connected to the fourth permanent magnet 20, and the other end is fixedly connected to the bottom of the third movable hole 18. The fifth permanent magnet 17 is disposed on the wall of the positioning groove 16. The fourth permanent magnet 20 and the fifth permanent magnet 17 are attracted to each other. The locking rod 23 has a locking groove 25 that mates with the fourth permanent magnet 20. It should be noted that the locking rod 23 is made of a non-magnetic material.

[0027] In another embodiment of the present invention, a plurality of guide rods 14 are provided in the movable groove 15, and a plurality of guide holes that cooperate with the guide rods 14 are provided on the movable seat 12.

[0028] In another embodiment of the present invention, the displacement driving assembly includes a power motor 2, a slide rail, a lead screw, a fixed seat 9, a support frame 8, a moving plate 4, a pneumatic cylinder 3, an electric push rod 6, and a fixed plate. The slide rail and the power motor 2 are mounted on the machine base 1. The fixed seat 9 is movably mounted on the slide rail and has a threaded hole that mates with the lead screw. The power motor 2 is connected to the lead screw via a transmission. The support frame 8 is mounted on the upper surface of the fixed seat 9. The pneumatic cylinder 3 is mounted on the upper end of the support frame 8 and has a guide groove 5 that mates with the moving plate 4. The piston rod of the pneumatic cylinder 3 is connected to the moving plate 4. The electric push rod 6 is mounted on the moving plate 4, and the fixing clamp 7 is mounted on the lower end of the electric push rod 6.

[0029] In the above scheme, before starting the test, the operator first clamps the foot pedal to be tested onto the fixed fixture. Then, the displacement drive assembly is activated, making multi-directional position adjustments according to the preset test path: the power motor drives the lead screw to rotate, causing the fixed seat and the entire structure above it to move horizontally along the slide rail; the piston rod of the pneumatic cylinder extends and retracts, driving the moving plate to make vertical or specific angle displacement adjustments along the guide groove; the electric actuator further drives the fixed fixture to apply precise vertical force. Through the coordinated action of these three drive mechanisms, the foot pedal on the fixed fixture is precisely transported to the corresponding position of the test assembly, ensuring that the surface of the foot pedal to be tested is in contact with the surface of the test plate pre-installed on the moving seat.

[0030] When installing the detection plate, the operator simply needs to naturally engage the selected detection plate with a specific surface roughness with the positioning pins at the four corners of the mounting slot of the moving seat through the positioning holes at its four corners, achieving rapid horizontal pre-positioning. At this time, the detection plate is not yet vertically locked and is temporarily placed on the moving seat by gravity. Subsequently, the displacement drive assembly causes the foot pedal to gently press against the surface of the detection plate and begins to apply a horizontal traction force along the length of the detection plate. As the foot pedal generates a horizontal frictional force on the detection plate, the detection plate, together with the moving seat, overcomes the initial repulsive force between permanent magnet block one and permanent magnet block two, and begins to move relative to the permanent magnet block on the base.

[0031] When the movable seat moves relative to permanent magnet block one, the vertical positioning component automatically activates: permanent magnet block three, located inside the movable seat, and permanent magnet block one, fixed to the wall of the movable slot, generate a gradually increasing repulsive force as they approach each other. This repulsive force pushes permanent magnet block three, thereby causing the locking rod fixedly connected to it to extend towards the detection plate. Due to the movement of the movable seat, the relative position between permanent magnet block five, which was originally opposite permanent magnet block four and located on the wall of the positioning slot of the detection plate, shifts, and the two are no longer directly opposite each other. Therefore, the attraction force of permanent magnet block five on permanent magnet block four disappears. After losing the attraction constraint, the previously compressed spring two pushes permanent magnet block four to move towards the locking rod, so that permanent magnet block four accurately engages in the preset locking groove on the locking rod. At this point, the locking rod is locked in the extended position by permanent magnet block four, and its end remains inserted into the locking hole on the side of the detection plate, thus completing the automatic vertical locking of the detection plate. The entire locking process is automatically triggered during the movement of the moving seat, requiring no manual intervention, ensuring that the detection plate will not jump off due to vibration or impact during subsequent sliding.

[0032] After the detection plate is securely locked, the displacement drive assembly continues to apply a stable horizontal traction force via the foot pedal. At this time, the friction between the foot pedal and the detection plate drives the detection plate and the moving seat to continue moving towards the first permanent magnet block. The repulsive force between the first permanent magnet block and the second permanent magnet block on the moving seat increases non-linearly with decreasing distance; this repulsive force simulates the resistance during sliding. During the movement of the moving seat, the operator or an external displacement sensor records the distance the foot pedal moves with the detection plate in real time. When the moving seat reaches a certain position, the static friction between the foot pedal and the detection plate reaches its maximum value, and then relative sliding (i.e., slippage) occurs. The recorded movement distance at this point is the anti-slip performance index of the foot pedal on the surface of the roughness detection plate. The shorter the movement distance, the earlier the foot pedal slips, and the worse the anti-slip performance; the longer the movement distance, the more the foot pedal can overcome the greater magnetic repulsive force without slipping, and the better the anti-slip performance. By comparing the movement distances under different detection plates (different surface roughness), the anti-slip characteristics of the foot pedal under simulated road conditions can be comprehensively evaluated.

[0033] After one test is completed, the displacement drive assembly stops traction, the foot pedal disengages from the test plate, and the friction between them disappears. Under the strong repulsive force between permanent magnet one and permanent magnet two, the moving seat moves in the opposite direction along with the test plate, automatically resetting to the initial position. As the moving seat moves away from permanent magnet one, the repulsive force between permanent magnet one and permanent magnet three disappears, and permanent magnet four and permanent magnet five re-align. The attraction of permanent magnet five to permanent magnet four takes effect again, pulling permanent magnet four out of the locking slot and releasing the constraint on the locking rod. The locking rod retracts under the action of spring one, exiting the locking hole of the test plate, and the test plate is released. The operator can easily remove the test plate, replace it with a test plate of another roughness, and repeat the above process. After all tests are completed, the displacement drive assembly returns the foot pedal to the initial position, the fixing fixture is released, and the operator removes the workpiece, thus completing a complete anti-slip performance test process.

[0034] In the above scheme, the testing component is equipped with multiple detachable testing plates with different surface roughness, which can simulate various road surface conditions from smooth to rough. Operators can quickly change the testing plates according to the testing standards, thereby completing a comprehensive evaluation of the anti-slip performance of the foot pedal on different simulated surfaces on the same equipment, greatly expanding the scope of testing applications. Secondly, the installation and removal process of the testing plates is extremely simple. In the horizontal direction, the positioning pins and positioning holes cooperate to achieve quick pre-positioning, while in the vertical direction, the locking mechanism automatically triggered when the moving seat moves completes the secure locking. No screws, clips or special tools are needed, and replacing a testing plate only takes a few seconds, significantly improving testing efficiency. At the same time, the locking mechanism is automatically activated during operation—only when the moving seat moves relative to the first permanent magnet block will the repulsive force between the third permanent magnet block and the first permanent magnet block push the locking rod into the testing plate, and the fourth permanent magnet block will lock into the locking groove to complete the locking; when the moving seat returns to its original position, the lock is automatically released. This "locking during movement and unlocking after rest" timing design ensures that the detection plate will not loosen due to vibration or impact during sliding (during the detection process, when the foot pedal disengages from the detection plate, it loses the vertical force applied by the electric lever, and under the strong repulsive force of permanent magnets one and two, it is prone to significant vibration, leading to detachment from the moving seat and damage to the detection plate). It also ensures that the operator can easily replace the detection plate after resetting, achieving a balance between safety and convenience. Furthermore, the device uses the repulsive arrangement of permanent magnets one and two to provide simulated sliding resistance. Compared to traditional mechanical friction or hydraulic damping methods, this method features no mechanical wear, continuous and smooth resistance changes, and high controllability. The moving seat automatically resets after the external force is removed, ensuring long-term stability and reliability. In terms of detection principle, the anti-slip performance is judged by directly observing the distance the foot pedal moves the detection plate. A shorter displacement indicates earlier slippage and poorer anti-slip performance, while a longer displacement indicates better anti-slip performance. This measurement method is intuitive, quantitative, and repeatable, allowing operators to quickly determine whether the product is qualified.

[0035] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A special device for testing automotive parts, characterized in that, It includes a machine base (1), a displacement drive assembly, a fixing fixture (7), and a detection assembly; The displacement drive assembly is mounted on the machine base (1), and the fixing fixture (7) is set on the displacement drive assembly. The fixing fixture (7) is used to clamp the foot pedal to be tested. The detection assembly includes a base (10), a movable seat (12), and several detection plates (13) with different surface roughness. The base (10) is provided with a movable groove (15), and the movable seat (12) is movably installed in the movable groove (15). A permanent magnet block one (11) is provided on the groove wall of the movable groove (15), and a permanent magnet block two (22) is provided on the end face of the movable seat (12) opposite to the permanent magnet block one (11). The permanent magnet block one (11) and the permanent magnet block two (22) are arranged in opposition to each other. The detection plate (13) is detachably installed on the movable seat (12).

2. The special device for testing automotive parts according to claim 1, characterized in that, The detection assembly also includes a positioning mechanism for positioning the detection plate (13).

3. The special device for testing automotive parts according to claim 2, characterized in that, The positioning mechanism includes a positioning groove (16) and a plurality of positioning posts. The positioning groove (16) is set on the detection plate (13). The movable seat (12) is provided with an installation groove for installing the detection plate (13). The plurality of positioning posts are respectively set on the four corners of the installation groove. The detection plate (13) is provided with positioning holes that cooperate with the positioning posts.

4. The special device for testing automotive parts according to claim 3, characterized in that, The positioning mechanism also includes a vertical positioning component, which is used to vertically position the detection plate (13).

5. The special device for testing automotive parts according to claim 4, characterized in that, The vertical positioning component includes a locking module, a permanent magnet block three (24), a locking rod (23), and a spring one (26). The movable seat (12) is provided with a movable hole one (27) for the permanent magnet block three (24) to move and a movable hole two for the locking rod one to move. The movable hole one (27) is connected to the movable hole two. The end of the movable hole two away from the movable hole one is connected to the positioning groove (16). One end of the locking rod (23) is fixedly connected to the permanent magnet block three (24). The spring one (26) is fitted on the locking rod (23) and one end abuts against the permanent magnet block three (24) and the other end abuts against the bottom of the hole of the movable hole one (27). The side end face of the detection plate (13) is provided with a locking hole (21) that cooperates with the locking rod (23). The locking module is installed in the movable seat (12) for positioning the locking rod (23).

6. The special device for testing automotive parts according to claim 5, characterized in that, The locking module includes a second spring (19), a fourth permanent magnet (20), and a fifth permanent magnet (17). The movable seat (12) is provided with a third movable hole (18) that cooperates with the fourth permanent magnet (20). One end of the second spring (19) is fixedly connected to the fourth permanent magnet (20), and the other end is fixedly connected to the bottom of the third movable hole (18). The fifth permanent magnet (17) is set on the groove wall of the positioning groove (16). The fourth permanent magnet (20) and the fifth permanent magnet (17) are attracted to each other. The locking rod (23) is provided with a locking groove (25) that cooperates with the fourth permanent magnet (20).

7. The special device for testing automotive parts according to claim 6, characterized in that, The locking rod (23) is made of non-magnetic material.

8. The special device for testing automotive parts according to claim 1, characterized in that, The movable groove (15) is provided with a number of guide rods (14), and the movable seat (12) is provided with a number of guide holes that cooperate with the guide rods (14).

9. A special device for testing automotive parts according to claim 1, characterized in that, The displacement drive assembly includes a power motor (2), a slide rail, a lead screw, a fixed seat (9), a support frame (8), a moving plate (4), a pneumatic cylinder (3), an electric push rod (6), and a fixed plate. The slide rail and the power motor (2) are mounted on the machine base (1). The fixed seat (9) is movably mounted on the slide rail. The fixed seat (9) is provided with a threaded hole that cooperates with the lead screw. The power motor (2) is connected to the lead screw. The support frame (8) is located on the upper end face of the fixed seat (9). The pneumatic cylinder (3) is located on the upper end of the support frame (8). The support frame (8) is provided with a guide groove (5) that cooperates with the moving plate (4). The piston rod of the pneumatic cylinder (3) is connected to the moving plate (4). The electric push rod (6) is mounted on the moving plate (4). The fixed clamp (7) is located at the lower end of the electric push rod (6).

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