A high-precision bearing noise detection device

Abstract

This application provides a high-precision bearing noise detection device, relating to the field of bearing testing. It includes a base with three grooves on its upper surface. A rotating rod is rotatably connected inside each groove, and two cams are fixedly fitted onto the outside of the rotating rod, each cam located inside one of the two right-side grooves. This application achieves convenient switching between rotational and vibration conditions under the same driving source through the coordination of a drive motor, drive shaft, sliding block, sliding groove, transmission shaft, electric push rod, push plate, second docking plate, docking rod, first docking plate, rotating sleeve, first synchronous pulley, synchronous belt, second synchronous pulley, rotating rod, cams, placement plate, guide rod, and return spring. When the transmission shaft engages with the bearing body, it drives the bearing to rotate, simulating rotational noise. When the transmission shaft disengages from the bearing body and drives the cams to rotate via the docking mechanism, it drives the placement plate to vibrate up and down, simulating bearing noise under vibration conditions.

Description

Technical Field

[0001] This utility model relates to the field of bearing testing, and more specifically, to a high-precision bearing noise testing device. Background Technology

[0002] A rolling bearing is a precision mechanical component that transforms the sliding friction between a rotating shaft and its housing into rolling friction, thereby reducing frictional losses. A rolling bearing generally consists of four parts: an inner ring, an outer ring, rolling elements, and a cage. The inner ring mates with the shaft and rotates with it; the outer ring mates with the bearing housing and provides support; the rolling elements are evenly distributed between the inner and outer rings by the cage, and their shape, size, and number directly affect the performance and lifespan of the rolling bearing; the cage ensures even distribution of the rolling elements, guides their rotation, and provides lubrication. Noise testing is one of the testing procedures for rolling bearings; bearings exceeding noise standards are rejected to ensure product quality.

[0003] In the prior art, Chinese utility model patent CN212539627U discloses a rolling bearing noise detection device, which drives the bearing under test to rotate through a stepper motor and uses a soundproof cover and noise sensor to collect the noise signal of the bearing under stable rotation. It has a certain detection accuracy and sound insulation effect. However, in actual working conditions, rolling bearings often do not only bear a single rotational excitation. In complex mechanical equipment, bearings are usually subjected to rotational motion and external vibration (such as frame vibration, impact load, etc.) at the same time. The existing technology's drive structure can only realize a single rotational motion and cannot simulate the noise response of the bearing under forced vibration. To achieve detection under vibration conditions, an additional independent detection device is usually required, which increases the equipment cost and structural complexity and is inconvenient to operate. In view of this, we propose a high-precision bearing noise detection device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to solve the problem of inconvenience in using some current high-precision bearing noise detection devices.

[0005] To achieve the aforementioned objectives and address the aforementioned problems, this utility model provides a high-precision bearing noise detection device, comprising: a base with three grooves on its upper surface; a rotating rod rotatably connected inside each groove; two cams fixedly fitted onto the outside of the rotating rod, each cam located inside one of the two right-side grooves; a drive motor fixedly mounted on the base; a fixing mechanism mounted on the base, with a high-precision bearing body mounted on its upper side; cams contacting the lower surface of the fixing mechanism; and a guide mechanism fixedly mounted on the base for guiding the movement trajectory of the fixing mechanism. The system includes: a fixed mechanism that allows for lifting and lowering on the base; a drive shaft fixedly connected to the output shaft of a drive motor, with a transmission shaft slidably mounted on its exterior; a connection mechanism located outside the transmission shaft; a switching mechanism fixedly mounted on the drive motor's mounting plate to move the transmission shaft along its length; a docking mechanism rotatably mounted on the drive motor's mounting plate, which, after docking and connecting, can rotate via the transmission shaft; a transmission mechanism fixedly mounted outside the docking mechanism to drive the docking mechanism and rotating rod to rotate synchronously; and a soundproof cover fixedly mounted on the upper surface of the base.

[0006] As a preferred technical solution of this application, the transmission shaft has two sliding grooves inside, and two sliding blocks are fixedly connected to the surface of the drive shaft, with the sliding blocks slidably connected inside the sliding grooves.

[0007] As a preferred technical solution of this application, the switching mechanism includes an electric push rod, which is fixedly mounted on the mounting plate of the drive motor. The telescopic end of the electric push rod is fixedly connected to a push plate, which is rotatably sleeved on the outside of the transmission shaft through a bearing.

[0008] As a preferred technical solution of this application, the docking mechanism includes a rotating sleeve, which is rotatably connected to the mounting plate of the drive motor and is arranged around the outside of the drive shaft. A first docking plate is fixedly sleeved on the end of the rotating sleeve away from the drive motor, and a plurality of docking through holes are opened on the surface of the first docking plate.

[0009] As a preferred technical solution of this application, the connecting mechanism includes a second docking plate, which is fixedly sleeved on the outside of the transmission shaft and located on the left side of the push plate. A plurality of docking rods are fixedly connected to the side surface of the second docking plate facing the first docking plate, and the docking rods are adapted to the docking through holes.

[0010] As a preferred technical solution of this application, the transmission mechanism includes a first synchronous wheel, which is fixedly sleeved on the outside of the rotating sleeve. A second synchronous wheel is fixedly sleeved on the outside of the rotating rod. The second synchronous wheel is located inside the left groove. A synchronous belt is sleeved on the outside of the first and second synchronous wheels.

[0011] As a preferred technical solution of this application, the guiding mechanism includes four guide rods, all of which are fixedly connected to the upper surface of the base. A return spring is movably sleeved on the outside of each of the four guide rods, and the upper end of the return spring is fixedly connected to the end of the guide rod.

[0012] As a preferred technical solution of this application, the fixing mechanism includes a placement plate, which is located on the upper side of the base and slidably sleeved on the outside of four guide rods. The lower end of the reset spring is fixedly connected to the placement plate, and a guide groove is opened on the surface of the placement plate. A bidirectional threaded rod is rotatably connected inside the guide groove. One end of the bidirectional threaded rod rotatably passes through the placement plate. Movable plates are threadedly sleeved on the two opposite threads of the bidirectional threaded rod. The movable plates are slidably connected inside the guide groove. Clamping blocks are fixedly connected to the adjacent surfaces of the two movable plates.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] In the scheme of this application:

[0015] 1. By coordinating the components such as the drive motor, drive shaft, sliding block, sliding groove, transmission shaft, electric push rod, push plate, second docking plate, docking rod, first docking plate, rotating sleeve, first synchronous pulley, synchronous belt, second synchronous pulley, rotating rod, cam, placement plate, guide rod, and return spring, convenient switching between rotation and vibration conditions under the same drive source is achieved. When the transmission shaft engages with the bearing body, it drives the bearing to rotate to simulate rotation noise; when the transmission shaft disengages from the bearing body and drives the cam to rotate through the docking mechanism, it drives the placement plate to vibrate up and down to simulate bearing noise under vibration conditions. No additional drive source is required, reducing equipment cost and complexity. Operation is simple and switching is reliable.

[0016] 2. Through the coordinated structure of the placement plate, bidirectional threaded rod, moving plate, clamping block, guide rod, return spring, cam, and soundproof cover, stable clamping of the bearing outer ring is achieved. The bidirectional threaded rod drives the two clamping blocks to synchronously center and clamp, ensuring that the bearing outer ring will not shift during vibration. The rotation frequency of the cam is related to the speed of the drive motor, and the vibration frequency can be precisely controlled by adjusting the motor speed. The return spring ensures that the placement plate and the cam always maintain contact, avoiding impact noise from interfering with the test results. At the same time, the soundproof cover effectively isolates external environmental noise, significantly improving the accuracy and repeatability of noise detection under vibration conditions. Attached Figure Description

[0017] Figure 1 A schematic diagram of the high-precision bearing noise detection device provided in this application;

[0018] Figure 2 A schematic diagram of the base in the high-precision bearing noise detection device provided in this application;

[0019] Figure 3 A cross-sectional view of the base in the high-precision bearing noise detection device provided in this application;

[0020] Figure 4 Provided for this application Figure 2 Enlarged view of point A in the middle;

[0021] Figure 5 Provided for this application Figure 3 Enlarged view of point B in the middle;

[0022] Figure 6 Provided for this application Figure 2 A magnified view of point C in the middle.

[0023] The image shows:

[0024] 1. Base; 2. Drive motor; 3. Placement plate; 4. High-precision bearing body; 5. Transmission shaft; 6. Drive shaft; 7. Sliding groove; 8. Sliding block; 9. Groove; 10. Rotating rod; 11. Cam; 12. Guide rod; 13. Return spring; 14. Rotating sleeve; 15. First synchronous pulley; 16. Second synchronous pulley; 17. Synchronous belt; 18. First docking plate; 19. Docking through hole; 20. Second docking plate; 21. Docking rod; 22. Electric push rod; 23. Push plate; 24. Guide groove; 25. Bidirectional threaded rod; 26. Moving plate; 27. Clamping block; 28. Soundproof cover. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] Example 1

[0030] Please refer to Figures 1-6 A high-precision bearing noise detection device includes a base 1. Three grooves 9 are formed on the upper surface of the base 1. A rotating rod 10 is rotatably connected inside the three grooves 9. Two cams 11 are fixedly sleeved on the outside of the rotating rod 10, with the two cams 11 located inside the two right-side grooves 9 respectively. A drive motor 2 is fixedly mounted on the base 1 via a mounting plate, and the output shaft of the drive motor 2 rotatably passes through the mounting plate. A fixing mechanism is provided on the base 1, and a high-precision bearing body 4 is mounted on the upper side of the fixing mechanism. The fixing mechanism is used to fix the outer ring of the high-precision bearing body 4. The cams 11 contact the lower surface of the fixing mechanism to generate vibration in the fixing mechanism. A guide mechanism is provided on the base 1. To guide the motion trajectory of the fixed mechanism, the output shaft of the drive motor 2 is fixedly connected to the drive shaft 6. The drive shaft 6 is slidably sleeved with a transmission shaft 5. The transmission shaft 5 is splinedly connected to the high-precision bearing body 4. A connecting mechanism is provided on the outside of the transmission shaft 5. A switching mechanism is provided on the mounting plate of the drive motor 2 to drive the transmission shaft 5 to move axially. A docking mechanism is rotatably connected on the mounting plate of the drive motor 2. After the docking mechanism and the connecting mechanism are docked, the transmission shaft 5 can drive the docking mechanism and the connecting mechanism to rotate. A transmission mechanism is provided on the outside of the docking mechanism to drive the docking mechanism and the rotating rod 10 to rotate synchronously. A soundproof cover 28 is fixedly installed on the upper surface of the base 1.

[0031] In the above embodiments, the soundproof cover 28 in this solution can refer to the prior art with the publication number CN212539627U, and is also equipped with a noise sensor and a sound insulation layer. Since it is not a major improvement structure, it will not be described in detail in this article.

[0032] In addition, workers can also embed rollers on the outside of the cam 11, and use the rollers to contact the placement plate 3, thereby reducing the friction between the rollers and the placement plate 3 and improving the smoothness of operation. Since this is a conventional technical means, it will not be elaborated on further in this article.

[0033] Furthermore, such as Figures 1-6 As shown, the transmission shaft 5 has two sliding grooves 7 inside, and the surface of the drive shaft 6 is fixedly connected to two sliding blocks 8, which are slidably connected inside the sliding grooves 7.

[0034] Thus, with the cooperation of the sliding groove 7 and the sliding block 8, the drive shaft 5 can slide along the length direction outside the drive shaft 6, and can also rotate with the drive shaft 6 when it rotates.

[0035] Furthermore, such as Figures 1-6 As shown, the switching mechanism includes an electric push rod 22, which is fixedly mounted on the mounting plate of the drive motor 2. The telescopic end of the electric push rod 22 is fixedly connected to a push plate 23, which is rotatably sleeved on the outside of the transmission shaft 5 via a bearing.

[0036] Since the inner ring of the bearing is fixedly sleeved on the outside of the transmission shaft 5, while the outer ring of the bearing is fixedly sleeved on the inside of the push plate 23, the push plate 23 will not interfere with the transmission shaft 5 when it rotates. When the push plate 23 moves, it can drive the transmission shaft 5 to move under the action of the bearing.

[0037] Thus, by starting the electric push rod 22 through the external controller, the push plate 23 can be moved. Since the push plate 23 is rotated and sleeved on the outside of the transmission shaft 5, it will also drive the transmission shaft 5 to move, thereby connecting or separating the transmission shaft 5 and the high-precision bearing body 4.

[0038] Furthermore, such as Figures 1-6 As shown, the docking mechanism includes a rotating sleeve 14, which is rotatably connected to the mounting plate of the drive motor 2 and is arranged around the outside of the drive shaft 6. A first docking plate 18 is fixedly sleeved on the end of the rotating sleeve 14 away from the drive motor 2, and a plurality of docking through holes 19 are opened on the surface of the first docking plate 18.

[0039] Furthermore, such as Figures 1-6 As shown, the connecting mechanism includes a second docking plate 20, which is fixedly sleeved on the outside of the transmission shaft 5 and located to the left of the push plate 23. Several docking rods 21 are fixedly connected to the side surface of the second docking plate 20 facing the first docking plate 18, and the docking rods 21 are adapted to the docking through holes 19.

[0040] Thus, when the drive shaft 5 moves, it will drive the second docking plate 20 to move, so that the docking rod 21 on the surface of the second docking plate 20 will be inserted into the docking through hole 19 on the surface of the first docking plate 18. Subsequently, when the drive shaft 6 drives the drive shaft 5 to rotate, the drive shaft 5 will drive the second docking plate 20 to rotate. The rotation of the second docking plate 20 will drive the rotation of the first docking plate 18. The rotation of the first docking plate 18 will drive the rotation of the rotating sleeve 14.

[0041] Furthermore, such as Figures 1-6As shown, the transmission mechanism includes a first synchronous pulley 15, which is fixedly sleeved on the outside of the rotating sleeve 14. A second synchronous pulley 16 is fixedly sleeved on the outside of the rotating rod 10. The second synchronous pulley 16 is located inside the left groove 9. A synchronous belt 17 is sleeved on the outside of the first synchronous pulley 15 and the second synchronous pulley 16.

[0042] Thus, the rotation of the rotating sleeve 14 and the cooperation between the first synchronous pulley 15, the second synchronous pulley 16 and the synchronous belt 17 can drive the rotating rod 10 to rotate, and the rotation of the rotating rod 10 can drive the rotation of the two cams 11.

[0043] Furthermore, such as Figures 1-6 As shown, the guiding mechanism includes four guide rods 12, all of which are fixedly connected to the upper surface of the base 1. Each of the four guide rods 12 is movably fitted with a return spring 13, and the upper end of the return spring 13 is fixedly connected to the end of the guide rod 12.

[0044] Furthermore, such as Figures 1-6 As shown, the fixing mechanism includes a placement plate 3, which is located on the upper side of the base 1 and slidably sleeved on the outside of the four guide rods 12. The lower end of the reset spring 13 is fixedly connected to the placement plate 3, and a guide groove 24 is opened on the surface of the placement plate 3. A bidirectional threaded rod 25 is rotatably connected inside the guide groove 24. One end of the bidirectional threaded rod 25 rotatably passes through the placement plate 3. Moving plates 26 are threadedly sleeved on the two opposite threads of the bidirectional threaded rod 25. The moving plates 26 are slidably connected inside the guide groove 24. Clamping blocks 27 are fixedly connected to the adjacent side surfaces of the two moving plates 26.

[0045] Thus, the staff places the high-precision bearing body 4 to be tested between the two clamping blocks 27, and then rotates the bidirectional threaded rod 25 to drive the moving plate 26 to slide inside the guide groove 24. The movement of the moving plate 26 can drive the movement of the clamping blocks 27, and the clamping blocks 27 will then clamp the high-precision bearing body 4.

[0046] In addition, after the high-precision bearing body 4 is fixed, the rotation of the cam 11 will force the placement plate 3 to move along the length of the guide rod 12, thereby simulating the high-precision bearing body 4 being in a vibration environment. Subsequently, noise detection can be achieved by using a noise sensor outside the soundproof cover 28.

[0047] In the above embodiment, rubber pads can be provided on the opposite side surfaces of the two clamping blocks 27, which not only increases the friction between them and the high-precision bearing body 4, but also avoids hard contact with the outer ring of the high-precision bearing body 4, thus preventing damage.

[0048] The high-precision bearing noise detection device provided by this utility model is used as follows:

[0049] First, place the high-precision bearing body 4 to be tested between the two clamping blocks 27 on the placement plate 3. Manually rotate the bidirectional threaded rod 25 to drive the two moving plates 26 to slide towards each other along the guide groove 24, so that the clamping blocks 27 clamp the outer ring of the high-precision bearing body 4 and complete the fixation. At this time, the transmission shaft 5 and the inner ring of the high-precision bearing body 4 are in a separated state.

[0050] When it is necessary to simulate rotational operation, the electric push rod 22 is activated by the external controller. The telescopic end of the electric push rod 22 pushes the push plate 23 to move to the right. The push plate 23 drives the transmission shaft 5 to slide along the axial direction of the drive shaft 6 (the sliding block 8 is guided in the sliding groove 7), and the front end of the transmission shaft 5 forms a spline connection with the inner ring of the high-precision bearing body 4. Then, the drive motor 2 is activated, and the drive motor 2 drives the drive shaft 6 to rotate. The drive shaft 6 drives the transmission shaft 5 to rotate synchronously through the cooperation of the sliding block 8 and the sliding groove 7, thereby driving the inner ring of the high-precision bearing body 4 to rotate, simulating the noise of the bearing in a stable rotational state. At this time, the noise sensor installed on the soundproof cover 28 collects the rotational noise, realizing noise detection under rotational operation.

[0051] When simulating vibration conditions, the electric push rod 22 reverses its movement, causing the push plate 23 and drive shaft 5 to move to the left, disengaging the drive shaft 5 from the high-precision bearing body 4. Simultaneously, the second mating plate 20, fixed to the drive shaft 5, moves to the left. The mating rod 21 on its surface is manually adjusted to rotate the angle of the first mating plate 18, inserting it into the mating through hole 19 on the first mating plate 18. At this point, the drive motor 2 is restarted, and the drive shaft 6 drives the drive shaft 5 to rotate. The drive shaft 5, through the engagement of the mating rod 21 and the mating through hole 19, drives the first mating plate 18 to rotate. The sleeve 14 rotates synchronously. The first synchronous wheel 15 outside the sleeve 14 drives the second synchronous wheel 16 to rotate through the synchronous belt 17, which in turn drives the rotating rod 10 to rotate. The two cams 11 on the rotating rod 10 rotate accordingly, periodically lifting the lower surface of the placement plate 3. The placement plate 3 moves up and down reciprocally under the guidance of the four guide rods 12. The return spring 13 provides the return force, thereby causing the high-precision bearing body 4 and its fixing mechanism to generate forced vibration, simulating noise under vibration conditions. The entire detection process is completed within the soundproof enclosure 28 to ensure the accuracy of the data acquisition.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A high-precision bearing noise detection device, characterized in that, The system includes a base (1), with three grooves (9) on the upper surface of the base (1). A rotating rod (10) is rotatably connected inside the three grooves (9). Two cams (11) are fixedly sleeved on the outside of the rotating rod (10). The two cams (11) are located inside the two grooves (9) on the right side respectively. A drive motor (2) is fixedly installed on the base (1). A fixing mechanism is set on the base (1), and a high-precision bearing body (4) is set on the upper side of the fixing mechanism. The cams (11) are in contact with the lower surface of the fixing mechanism. When the cams (11) rotate, they force the fixing mechanism to move up and down to achieve vibration. A guide mechanism is fixedly installed on the base (1) to guide the movement trajectory of the fixing mechanism so that the fixing mechanism can move up and down on the base (1). A drive shaft (6) is fixedly connected to the output shaft of a drive motor (2). A transmission shaft (5) is slidably mounted on the outside of the drive shaft (6). The transmission shaft (5) is splinedly connected to the high-precision bearing body (4). A connecting mechanism is set outside the transmission shaft (5). A switching mechanism is fixedly mounted on the mounting plate of the drive motor (2) and is used to drive the transmission shaft (5) to move along its length. A docking mechanism is rotatably mounted on the mounting plate of the drive motor (2). After the docking mechanism and the connecting mechanism are docked, the transmission shaft (5) can drive the docking mechanism and the connecting mechanism to rotate. A transmission mechanism is fixedly mounted outside the docking mechanism and is used to drive the docking mechanism and the rotating rod (10) to rotate synchronously. A soundproof cover (28) is fixedly mounted on the upper surface of the base (1).

2. The high-precision bearing noise detection device according to claim 1, characterized in that, The transmission shaft (5) has two sliding grooves (7) inside, and the surface of the drive shaft (6) is fixedly connected to two sliding blocks (8), which are slidably connected inside the sliding grooves (7).

3. The high-precision bearing noise detection device according to claim 2, characterized in that, The switching mechanism includes an electric push rod (22), which is fixedly mounted on the mounting plate of the drive motor (2). The telescopic end of the electric push rod (22) is fixedly connected to a push plate (23), which is rotatably sleeved on the outside of the transmission shaft (5) through a bearing.

4. The high-precision bearing noise detection device according to claim 3, characterized in that, The docking mechanism includes a rotating sleeve (14), which is rotatably connected to the mounting plate of the drive motor (2) and is arranged around the outside of the drive shaft (6). A first docking plate (18) is fixedly sleeved on one end of the rotating sleeve (14) away from the drive motor (2), and a plurality of docking through holes (19) are opened on the surface of the first docking plate (18).

5. The high-precision bearing noise detection device according to claim 4, characterized in that, The connecting mechanism includes a second docking plate (20), which is fixedly sleeved on the outside of the transmission shaft (5) and located on the left side of the push plate (23). Several docking rods (21) are fixedly connected to the side surface of the second docking plate (20) facing the first docking plate (18), and the docking rods (21) are adapted to the docking through holes (19).

6. The high-precision bearing noise detection device according to claim 5, characterized in that, The transmission mechanism includes a first synchronous wheel (15), which is fixedly sleeved on the outside of the rotating sleeve (14). A second synchronous wheel (16) is fixedly sleeved on the outside of the rotating rod (10). The second synchronous wheel (16) is located inside the left groove (9). A synchronous belt (17) is sleeved on the outside of the first synchronous wheel (15) and the second synchronous wheel (16).

7. A high-precision bearing noise detection device according to claim 6, characterized in that, The guiding mechanism includes four guide rods (12), all of which are fixedly connected to the upper surface of the base (1). Each of the four guide rods (12) is movably fitted with a reset spring (13), and the upper end of the reset spring (13) is fixedly connected to the end of the guide rod (12).

8. A high-precision bearing noise detection device according to claim 7, characterized in that, The fixing mechanism includes a placement plate (3), which is located on the upper side of the base (1) and slidably sleeved on the outside of the four guide rods (12). The lower end of the reset spring (13) is fixedly connected to the placement plate (3), and a guide groove (24) is provided on the surface of the placement plate (3). A bidirectional threaded rod (25) is rotatably connected inside the guide groove (24). One end of the bidirectional threaded rod (25) rotatably passes through the placement plate (3). Moving plates (26) are threadedly sleeved on the two opposite threads of the bidirectional threaded rod (25). The moving plates (26) are slidably connected inside the guide groove (24). Clamping blocks (27) are fixedly connected to the adjacent side surfaces of the two moving plates (26).

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