New energy automobile battery performance detection device

Abstract

The invention belongs to the technical field of new energy automobile batteries, and discloses a new energy automobile battery performance detection device which comprises a rack, telescopic rods are fixedly connected to the periphery of the inner side of the rack, an extrusion frame is fixedly connected to the top surface of the rack, and a hydraulic cylinder is fixedly connected to the inner top surface of the extrusion frame. The device further comprises a carrying mechanism and a clamping mechanism. By means of the arranged carrying mechanism, after the battery pack is placed on a carrying plate, telescopic rods on the periphery are driven to stretch out, so that the telescopic rods drive the clamping mechanism to push the battery pack, at the moment, under the action of a ball, the battery pack makes contact with the ball and does not make contact with the carrying plate, and at the moment, friction between the battery pack and the carrying plate is avoided when the battery pack moves; the power requirement for pushing the battery pack is lowered, meanwhile, after an extrusion test is completed, the liquid pump is started to work reversely, the transverse plate and the mounting column are lifted again, and therefore the battery pack is jacked up by the ball again, and the battery pack can be rapidly taken down from the carrying mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle batteries, and specifically relates to a new energy vehicle battery performance detection device. Background Art

[0002] As the global energy crisis and environmental problems become increasingly serious, new energy vehicles have become an important alternative to traditional fuel vehicles. As the core component of new energy vehicles, the performance of batteries is directly related to the vehicle's range, safety and service life. Among them, the battery's compression performance is one of the important indicators to measure its safety.

[0003] In the existing compression test of the battery pack of new energy vehicles, most of the test equipment often adopts the method of pushing the battery pack to slide on the stage when positioning and fixing the battery pack in the early stage of the test, or replaces the stage with a roller to increase the movement speed of the battery pack. However, the above scheme has the following problems: as the number of tests increases, the stage is prone to uneven pits after repeated friction with the battery pack, resulting in part of the battery pack structure being suspended after pressure is applied to the battery pack. The use of a roller will also cause the battery pack to slide when under pressure, thereby affecting the actual battery pack compression performance data. Summary of the invention

[0004] The purpose of the present invention is to provide a new energy vehicle battery performance detection device to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a new energy vehicle battery performance detection device, comprising a frame, the inner side of the frame is fixedly connected to telescopic rods, the top surface of the frame is fixedly connected to an extrusion frame, the inner top surface of the extrusion frame is fixedly connected to a hydraulic cylinder, and further comprising:

[0006] The object-carrying mechanism comprises an object-carrying shell fixedly connected to the inside of the frame, the top surface of the object-carrying shell is open and fixedly connected to a object-carrying plate, the top surface of the object-carrying plate is provided with a plurality of first circular holes, the inside of the object-carrying shell is fixedly connected to an inner bracket, a liquid capsule is fixedly installed inside the inner bracket, a transverse plate is slidably connected inside the inner bracket, the transverse plate is located above the liquid capsule, a plurality of mounting posts are fixedly connected to the top surface of the transverse plate, and a sphere is embedded on the top of the mounting post;

[0007] The clamping mechanism includes a clamp fixedly connected to the telescopic end of the telescopic rod, a symmetrical first slide groove is provided on the side of the clamp, the first slide groove is parallel to the telescopic direction of the telescopic rod, and a second slide groove is also provided on the adjacent side of the clamp, the second slide groove is perpendicular to and communicates with the first slide groove, the first slide groove is internally slidably connected to a first inclined block, and the second slide groove is internally slidably connected to a symmetrical second inclined block.

[0008] Preferably, a liquid pump is provided below the carrying mechanism, and a liquid port is provided at the bottom of the liquid bag. The liquid port passes through the bottom surface of the inner bracket and is connected to a connecting port of the liquid pump. The other connecting port of the liquid pump is fixedly connected to a liquid storage box, and the liquid storage box is communicated with the hydraulic cylinder through a pipeline.

[0009] Preferably, the mounting post is located directly below the corresponding first circular hole, a supporting mesh plate is fixedly connected to the interior of the object-carrying housing, and the mounting post is located in a grid of the supporting mesh plate.

[0010] Preferably, when the liquid capsule is fully inflated, the top of the sphere passes through the corresponding first circular hole and is located on the top surface of the carrier plate.

[0011] Preferably, a third slide groove is provided on the inner top surface of the second slide groove, and a driving block slidably connected in the third slide groove is fixedly connected to the top surface of the second inclined block, and a spring is elastically connected between the driving block and the inner side surface of the third slide groove, and the spring drives the second inclined block to move into the second slide groove.

[0012] Preferably, the inclined surfaces of the first inclined block and the second inclined block intersect, and when the first inclined block moves toward the direction of the telescopic rod, the second inclined block is pushed to extend outward.

[0013] Preferably, the clamp is concave in shape, with its opening facing the object-carrying mechanism, and a rubber block is fixedly connected inside its opening.

[0014] Preferably, the telescopic end of the hydraulic cylinder is fixedly connected to a squeezing plate, and the center of the squeezing plate is located directly above the center of the carrier plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, after the battery pack is placed on the carrier board, the telescopic rods on all sides are driven to extend, so that the telescopic rods drive the clamping mechanism to push the battery pack. At this time, under the action of the sphere, the battery pack contacts the sphere but not the carrier board. Therefore, the movement of the battery pack will not cause friction with the carrier board. On the one hand, the power demand for pushing the battery pack is reduced, so that the battery pack can move synchronously with the extension of the telescopic rod. On the other hand, the friction between the battery pack and the carrier board after the battery pack is directly pushed by the telescopic rod on the carrier board is prevented, which causes the carrier board to be worn, resulting in the carrier board becoming thinner after long-term use and unable to provide sufficient support for the battery pack, and finally being damaged by the extrusion of the hydraulic cylinder.

[0017] 2. When it is necessary to drive the hydraulic cylinder to perform a compression test on the battery pack, the hydraulic oil in the liquid bag is pumped out and sent into the hydraulic cylinder through the pipeline by starting the liquid pump, driving the hydraulic cylinder to extend. At this time, as the hydraulic oil in the liquid bag is pumped out, the height of the liquid bag is reduced, causing the upper horizontal plate slidably connected to the inner bracket to move downward. At this time, the mounting column and the sphere descend, so that the top of the sphere is located below the top surface of the carrier plate. At this time, the bottom surface of the battery pack contacts the top surface of the carrier plate and is clamped by the clamping mechanism, thereby fixing the battery pack during the extrusion process to prevent it from moving when squeezed. At the same time, after the extrusion test is completed, the hydraulic pump is started to work in the reverse direction to pump the hydraulic oil in the hydraulic cylinder back into the liquid bag, so that the horizontal plate and the mounting column are raised again, so that the sphere lifts up the battery pack again, so that the battery pack can be quickly removed from the carrier mechanism.

[0018] 3. Secondly, according to the second inclined block in the clamping mechanism provided in the present invention, when clamping the battery pack, the clamp contacts the side of the battery pack, and with the cooperation of multiple clamps, the center of the battery pack is aligned with the center of the carrying mechanism. As the hydraulic cylinder drives the extrusion plate to squeeze the battery pack, the shell of the battery pack is deformed. At this time, the side of the battery pack changes from a vertical state to a state in which the middle of the side bulges outward. At this time, the bulging battery pack shell pushes the first inclined block to move in the direction of the telescopic rod, so that the first inclined block pushes the second inclined block to extend outward. At this time, by measuring the extension amount of the second inclined block, the deformation amount of the battery pack shell can be obtained by calculation, and through multiple extrusion experiments, the upper limit of the recoverable extrusion force on the battery pack shell can be obtained, thereby enriching the detection data of the battery pack. At the same time, according to the extension amount of the two second inclined blocks in the same clamp, it can be determined whether the pressure applied by the hydraulic cylinder is evenly dispersed by the battery pack shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the object-carrying mechanism of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the structure of the object carrying mechanism of the present invention;

[0022] Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0023] Figure 5 It is a schematic diagram of the structure of the clamping mechanism of the present invention;

[0024] Figure 6 It is a schematic cross-sectional structural diagram of the clamping mechanism of the present invention.

[0025] In the figure: 1. frame; 11. telescopic rod; 12. extrusion frame; 13. hydraulic cylinder; 14. extrusion plate; 15. pipeline; 16. liquid storage box; 17. liquid pump; 2. loading mechanism; 21. loading shell; 22. loading plate; 23. first round hole; 24. inner bracket; 25. supporting mesh plate; 26. liquid capsule; 27. horizontal plate; 28. mounting column; 29. ​​ball; 210. liquid port; 3. clamping mechanism; 31. chuck; 32. first slide slot; 33. second slide slot; 34. third slide slot; 35. first inclined block; 36. second inclined block; 37. spring; 38. rubber block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 5 As shown, an embodiment of the present invention provides a new energy vehicle battery performance detection device, including a frame 1, a telescopic rod 11 is fixedly connected to the inner side of the frame 1, a pressing frame 12 is fixedly connected to the top surface of the frame 1, and a hydraulic cylinder 13 is fixedly connected to the inner top surface of the pressing frame 12, and further includes:

[0028] The object-carrying mechanism 2 comprises an object-carrying shell 21 fixedly connected to the inside of the frame 1, the top surface of the object-carrying shell 21 is open and fixedly connected to a object-carrying plate 22, the top surface of the object-carrying plate 22 is provided with a plurality of first circular holes 23, the inside of the object-carrying shell 21 is fixedly connected to an inner bracket 24, a liquid capsule 26 is fixedly installed inside the inner bracket 24, a transverse plate 27 is slidably connected inside the inner bracket 24, the transverse plate 27 is located above the liquid capsule 26, a plurality of mounting posts 28 are fixedly connected to the top surface of the transverse plate 27, and a round ball 29 is embedded on the top of the mounting post 28;

[0029] The clamping mechanism 3 includes a clamp 31 fixedly connected to the telescopic end of the telescopic rod 11, and a symmetrical first slide groove 32 is provided on the side of the clamp 31. The first slide groove 32 is parallel to the telescopic direction of the telescopic rod 11, and a second slide groove 33 is also provided on the adjacent side of the clamp 31. The second slide groove 33 is perpendicular to and communicates with the first slide groove 32. The first slide groove 32 is internally slidably connected to a first inclined block 35, and the second slide groove 33 is internally slidably connected to a symmetrical second inclined block 36.

[0030] In the present invention, after the battery pack is placed on the carrier plate 22, the carrier mechanism 2 is set up, and the telescopic rods 11 on all sides are driven to extend, so that the telescopic rods 11 drive the clamping mechanism 3 to push the battery pack. At this time, under the action of the ball 29, the battery pack contacts the ball 29 but not the carrier plate 22. Therefore, the movement of the battery pack will not cause friction with the carrier plate 22. On the one hand, the power demand for pushing the battery pack is reduced, so that the battery pack can move synchronously with the extension of the telescopic rod 11. On the other hand, it prevents the carrier plate 22 from being worn due to the friction between the battery pack and the carrier plate 22 after the battery pack is directly pushed by the telescopic rod 11 on the carrier plate 22, resulting in the carrier plate 22 becoming thinner after long-term use and unable to provide sufficient support for the battery pack, and finally being damaged by the extrusion of the hydraulic cylinder 13. When it is necessary to drive the hydraulic cylinder 13 to perform a pressure test on the battery pack, the carrier plate 22 is prevented from being worn due to the friction between the battery pack and the carrier plate 22. By starting the liquid pump 17, the hydraulic oil in the liquid capsule 26 is pumped out and sent into the hydraulic cylinder 13 through the pipeline 15, driving the hydraulic cylinder 13 to extend. At this time, as the hydraulic oil in the liquid capsule 26 is pumped out, the height of the liquid capsule 26 is reduced, causing the horizontal plate 27 slidably connected to the inner bracket 24 to move downward. At this time, the mounting column 28 and the ball 29 descend, so that the top of the ball 29 is located below the top surface of the carrier plate 22. At this time, the bottom surface of the battery pack contacts the top surface of the carrier plate 22 and is clamped by the clamping mechanism 3, so as to fix the battery pack during the extrusion process and prevent it from moving when squeezed. At the same time, after the extrusion test is completed, the liquid pump 17 is started to work in the reverse direction to pump the hydraulic oil in the hydraulic cylinder 13 back into the liquid capsule 26, so that the horizontal plate 27 and the mounting column 28 are raised again, so that the ball 29 lifts the battery pack again, so that the battery pack can be quickly removed from the carrier mechanism 2.

[0031] Secondly, according to the second inclined block 36 in the clamping mechanism 3 provided in the present invention, when clamping the battery pack, the clamp 31 contacts the side of the battery pack, and with the cooperation of multiple clamps 31, the center of the battery pack is aligned with the center of the carrying mechanism 2. As the hydraulic cylinder 13 drives the extrusion plate 14 to squeeze the battery pack, the shell of the battery pack is deformed. At this time, the side of the battery pack changes from a vertical state to a state in which the middle of the side bulges outward. At this time, the bulging battery pack shell pushes the first inclined block 35 to move in the direction of the telescopic rod 11, so that the first inclined block 35 pushes the second inclined block 36 to extend outward. At this time, by measuring the extension amount of the second inclined block 36, the deformation amount of the battery pack shell can be obtained by calculation, and through multiple extrusion experiments, the upper limit of the recoverable extrusion force on the battery pack shell can be obtained, thereby enriching the detection data of the battery pack. At the same time, according to the extension amount of the two second inclined blocks 36 in the same clamp 31, it can be determined whether the pressure applied by the hydraulic cylinder 13 is evenly dispersed by the battery pack shell.

[0032] Among them, a liquid pump 17 is arranged below the carrier mechanism 2, and a liquid port 210 is arranged at the bottom of the liquid bag 26. The liquid port 210 passes through the bottom surface of the inner bracket 24 and is connected to a connecting port of the liquid pump 17. The other connecting port of the liquid pump 17 is fixedly connected to a liquid storage box 16, and the liquid storage box 16 and the hydraulic cylinder 13 are communicated through a pipe 15.

[0033] As the liquid pump 17 draws the hydraulic oil out of the liquid bag 26, the height of the liquid bag 26 decreases. At this time, the cross plate 27 slides downward under the gravity of the battery pack, the mounting column 28 and the ball 29, so that the bottom surface of the battery pack contacts the top surface of the loading plate 22. Under the gravity of the battery pack itself, the telescopic rod 11 cannot push the battery pack, so that the battery pack positioned by the telescopic rod 11 will not be pushed when it is subsequently clamped by the clamping mechanism 3, thereby preventing the position of the battery pack from shifting during the extrusion test, resulting in uneven force on the battery pack, and then causing the test results to be inconsistent with actual needs.

[0034] The mounting post 28 is located directly below the corresponding first circular hole 23, and a support mesh 25 is fixedly connected to the interior of the loading housing 21, and the mounting post 28 is located in the grid of the support mesh 25. The support mesh 25 supports the loading board 22 above to prevent the loading board 22 from bending after multiple tests.

[0035] When the liquid capsule 26 is fully inflated, the top of the ball 29 passes through the corresponding first circular hole 23 and is located on the top surface of the carrier plate 22 .

[0036] When the ball 29 extends out of the first round hole 23, the battery pack is not in contact with the carrier plate 22, and can be pushed by the telescopic rod 11. At this time, under the combined push of the multiple telescopic rods 11, the battery pack is positioned, and when the subsequent extrusion test is performed, as the liquid pump 17 works, the mounting column 28 automatically falls, so that the battery pack is in contact with the carrier plate 22. After the extrusion test is completed, as the liquid pump 17 draws out the liquid in the hydraulic cylinder 13 and pumps it into the liquid bag 26, the battery pack is lifted up again by the ball 29 on the mounting column 28, so that the battery pack can be quickly removed from the carrier mechanism 2.

[0037] Among them, the inner top surface of the second slide groove 33 is provided with a third slide groove 34, and the top surface of the second inclined block 36 is fixedly connected to a driving block slidably connected in the third slide groove 34, and a spring 37 is elastically connected between the driving block and the inner side surface of the third slide groove 34. The spring 37 drives the second inclined block 36 to move into the second slide groove 33, and the inclined surfaces of the first inclined block 35 and the second inclined block 36 intersect. When the first inclined block 35 moves in the direction of the telescopic rod 11, the second inclined block 36 is pushed to extend outward, and the clamp 31 is "concave" shaped, with its opening facing the loading mechanism 2, and a rubber block 38 is fixedly connected in its opening.

[0038] In the initial positioning stage, as the battery pack contacts the clamp 31, the battery pack is pushed by the clamp 31, and the battery pack will not squeeze the rubber block 38 located in the middle layer because the side surface of the battery pack is now in a vertical state. At this time, the battery pack and the first inclined block 35 are in a stationary state after abutment, that is, the first inclined block 35 will not be pushed to move. As it enters the extrusion stage, as the telescopic end of the hydraulic cylinder 13 extends, the extrusion plate 14 finally contacts the battery pack and squeezes it. At this time, the outer shell of the battery pack is squeezed and deformed from the connection between the upper and lower parts, that is, the joint of the battery pack outer shell bulges. At this time, as the joint bulges, the rubber block 38 and the first inclined block 35 are squeezed. After being squeezed, the first inclined block 35 moves toward the direction of the telescopic rod 11, thereby pushing the second inclined block 36 to move to one side through the first inclined block 35, so that the second inclined block 36 extends from one side of the clamp 31. At this time, by measuring and calculating the extended length of the second inclined block 36, the deformation amount of the battery pack outer shell can be understood, which is convenient for the test personnel to record relevant data.

[0039] The telescopic end of the hydraulic cylinder 13 is fixedly connected with a squeezing plate 14 , and the center of the squeezing plate 14 is located just above the center of the loading plate 22 , so as to ensure that the battery pack is subjected to uniform pressure when the hydraulic cylinder 13 squeezes the battery pack.

[0040] Working principle:

[0041] When using the present invention to test the compressive performance of the battery pack of a new energy vehicle, the battery pack is first placed on the loading plate 22, and then the two relative telescopic rods 11 are controlled to extend synchronously. After the group of telescopic rods 11 pushes the battery pack, they are retracted so as not to contact the battery pack. Then, the other two relative telescopic rods 11 are controlled to push the battery pack. After the battery pack is pushed by multiple telescopic rods 11 so that its center is on the same vertical line as the center of the loading mechanism 2, the multiple telescopic rods 11 are used to clamp the battery pack together.

[0042] After completing the clamping stage, the hydraulic oil in the liquid capsule 26 is extracted by starting the liquid pump 17, and the hydraulic oil is input into the hydraulic cylinder 13 through the pipeline 15. As the hydraulic oil is extracted from the liquid capsule 26, the height of the liquid capsule 26 is reduced, and the cross plate 27 on the liquid capsule 26 is lowered, thereby driving the mounting column 28 and the ball 29 to descend. At this time, the battery pack cannot move because it is in contact with the carrier plate 22 and is clamped by the telescopic rod 11 through the clamping mechanism 3.

[0043] As the hydraulic cylinder 13 squeezes the battery pack, the battery pack shell deforms outward on all sides, thereby squeezing the rubber block 38 and the first inclined block 35. As the first inclined block 35 is pushed, the second inclined block 36 is pushed outward through the inclined surface where the first inclined block 35 and the second inclined block 36 meet, so that one end of the second inclined block 36 extends out of the second slide groove 33 in the clamp 31. At this time, by measuring the extended length of the second inclined block 36, the deformation amount of the side of the battery pack shell can be obtained according to calculation. When the extended lengths of the two second inclined blocks 36 in a clamp 31 are different, it can be known that there is a problem with the design of the battery pack shell, and the external pressure cannot act evenly on the entire battery pack shell.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy vehicle battery performance testing device, comprising a frame (1), wherein the inner sides of the frame (1) are all fixedly connected with telescopic rods (11), the top surface of the frame (1) is fixedly connected with an extrusion frame (12), and the inner top surface of the extrusion frame (12) is fixedly connected with a hydraulic cylinder (13), characterized in that: Also includes: A loading mechanism (2), the loading mechanism (2) comprising a loading shell (21) fixedly connected to the inside of the frame (1), the top surface of the loading shell (21) being open and fixedly connected to a loading plate (22), the top surface of the loading plate (22) being provided with a plurality of first circular holes (23), the inside of the loading shell (21) being fixedly connected to an inner bracket (24), the inside of the inner bracket (24) being fixedly installed with a liquid capsule (26), the inside of the inner bracket (24) being slidably connected to a transverse plate (27), the transverse plate (27) being located above the liquid capsule (26), the top surface of the transverse plate (27) being fixedly connected to a plurality of mounting posts (28), the tops of the mounting posts (28) being embedded with round balls (29); The clamping mechanism (3) comprises a clamp (31) fixedly connected to the telescopic end of the telescopic rod (11), a side surface of the clamp (31) is provided with a symmetrical first slide groove (32), the first slide groove (32) is parallel to the telescopic direction of the telescopic rod (11), an adjacent side surface of the clamp (31) is further provided with a second slide groove (33), the second slide groove (33) is perpendicular to and communicates with the first slide groove (32), a first inclined block (35) is slidably connected inside the first slide groove (32), and a symmetrical second inclined block (36) is slidably connected inside the second slide groove (33).

2. A new energy vehicle battery performance detection device according to claim 1, characterized in that: A liquid pump (17) is arranged below the object-carrying mechanism (2), and a liquid port (210) is arranged at the bottom of the liquid bag (26). The liquid port (210) passes through the bottom surface of the inner bracket (24) and is connected to a connecting port of the liquid pump (17). The other connecting port of the liquid pump (17) is fixedly connected to a liquid storage box (16), and the liquid storage box (16) and the hydraulic cylinder (13) are communicated through a pipeline (15).

3. A new energy vehicle battery performance detection device according to claim 2, characterized in that: The mounting column (28) is located directly below the corresponding first circular hole (23); a supporting mesh plate (25) is fixedly connected to the interior of the object-carrying housing (21); and the mounting column (28) is located within the grid of the supporting mesh plate (25).

4. A new energy vehicle battery performance detection device according to claim 3, characterized in that: When the liquid capsule (26) is fully inflated, the top end of the sphere (29) passes through the corresponding first circular hole (23) and is located on the top surface of the carrier plate (22).

5. A new energy vehicle battery performance detection device according to claim 4, characterized in that: The inner top surface of the second slide groove (33) is provided with a third slide groove (34); the top surface of the second inclined block (36) is fixedly connected with a driving block slidably connected in the third slide groove (34); a spring (37) is elastically connected between the driving block and the inner side surface of the third slide groove (34); the spring (37) drives the second inclined block (36) to move into the second slide groove (33).

6. A new energy vehicle battery performance detection device according to claim 1, characterized in that: The inclined surfaces of the first inclined block (35) and the second inclined block (36) intersect, and when the first inclined block (35) moves in the direction of the telescopic rod (11), the second inclined block (36) is pushed to extend outward.

7. A new energy vehicle battery performance detection device according to claim 6, characterized in that: The clamp (31) is concave in shape, with its opening facing the object-carrying mechanism (2), and a rubber block (38) is fixedly connected inside the opening.

8. A new energy vehicle battery performance detection device according to claim 7, characterized in that: The telescopic end of the hydraulic cylinder (13) is fixedly connected to a squeezing plate (14), and the center of the squeezing plate (14) is located directly above the center of the loading plate (22).

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