Hardness detection device for plastic products

Abstract

The invention relates to the field of plastic product detection, in particular to a hardness detection device for a plastic product. Comprising a detection machine body, a first cylinder is arranged on the detection machine body, a detector is connected to the end of a telescopic rod of the first cylinder, a second cylinder is arranged on the side, away from the first cylinder, of the detection machine body, the second cylinder and the detector are electrically connected through a control module, and a supporting cover is arranged on the top of a telescopic rod of the second cylinder; a rotating frame is arranged on the side, close to the supporting cover, of the detection machine body and rotationally connected with the detection machine body, and an air bag ring is arranged on the inner side of the rotating frame. Through cooperation of a first wedge block, a second wedge block, a piston rod, an air bag ring and other components, the table tennis ball can be automatically clamped through the air bag ring after the front face of the table tennis ball is qualified, and then through cooperation of a rack, a gear, a worm gear and a worm, a rotating frame rotates to drive the air bag ring to rotate, and the table tennis ball is automatically turned over.

Description

Technical Field

[0001] This invention relates to the field of plastic product testing, and more particularly to a device for testing the hardness of plastic products. Background Technology

[0002] Plastic products cover a wide range of products. Taking table tennis balls as an example, after the table tennis balls are produced, they usually need to be tested. One of the testing points is the hardness test. Currently, the hardness test of table tennis balls is usually carried out using a hardness testing device, which consists of components such as a base, support seat, screw, rod sleeve, connector, testing device, fixing device and measuring device.

[0003] First, the ping-pong ball needs to be placed in a fixing device to secure it. Then, the hardness of the ping-pong ball is tested using a testing device. To improve the accuracy of the test, it is usually necessary to test the reverse side of the ping-pong ball as well. However, after testing the top side of the ping-pong ball, it needs to be manually flipped over to test the reverse side. This manual flipping is cumbersome and reduces testing efficiency. Therefore, a device for testing the hardness of plastic products is now being developed. Summary of the Invention

[0004] The technical solution of the present invention is as follows: a device for testing the hardness of plastic products, comprising a testing body, a first cylinder on the testing body, a detector connected to the end of the telescopic rod of the first cylinder, a second cylinder on the side of the testing body away from the first cylinder, the second cylinder and the detector being electrically connected through a control module, a cover on the top of the telescopic rod of the second cylinder, a rotating frame on the side of the testing body near the cover, the rotating frame being rotatably connected to the testing body, and an airbag ring on the inner side of the rotating frame.

[0005] As a preferred embodiment of the present invention, it further includes an air cylinder, which is disposed on the side of the testing machine body near the rotating frame. A one-way air pipe is provided at the top of the air cylinder, and the one-way air pipe is connected to the air cylinder and the rotating frame. A first spring is connected between the piston rod and the air cylinder. A one-way air inlet valve is provided at the top of the air cylinder, and an air outlet valve is connected to the side of the rotating frame near the piston rod.

[0006] As a preferred embodiment of the present invention, it further includes a worm gear, which is fixedly connected to the side of the rotating frame away from the air cylinder. The worm gear meshes with a worm, which is rotatably connected to the testing machine body. A one-way gear is fixedly connected to the worm, which meshes with a first rack. The first rack is slidably connected to the testing machine body. A pressing rod is connected to the telescopic rod of the second cylinder, and the pressing rod and the lower part of the first rack are pressed together.

[0007] As a preferred embodiment of the present invention, it further includes a distance sensor, which is disposed on the top of the cylinder and electrically connected to the first cylinder and the second cylinder through a control module.

[0008] As a preferred embodiment of the present invention, a first wedge block is slidably connected to the piston rod, a third spring is connected between the first wedge block and the piston rod, a connecting body is fixedly connected to the telescopic rod of the first cylinder, a second wedge block is provided on the side of the connecting body away from the first cylinder, the second wedge block and the first wedge block are pressed together, and a third wedge block is provided on the side of the detection body close to the second wedge block, the third wedge block and the first wedge block are pressed together.

[0009] As a preferred embodiment of the present invention, a plate is rotatably connected to the side of the first wedge block away from the third spring, the left part of the first wedge block abuts against the left part of the plate, a torsion spring is connected between the plate and the first wedge block, a blocking member is slidably connected to the side of the detection body near the third wedge block, the blocking member is pressed and engaged with the plate, the upper part of the blocking member is pressed and engaged with the connecting body, a fourth spring is connected between the blocking member and the detection body, a pulling body is slidably connected to the side of the detection body near the blocking member, and the pulling body is pressed and engaged with the left part of the first wedge block.

[0010] As a preferred embodiment of the present invention, it further includes a rotating rod, which is rotatably connected to the side of the testing machine body near the ping-pong ball. The ends of the rotating rod and the worm gear are provided with bevel gears that mesh with each other. The side of the rotating rod away from the bevel gear is connected to a conveyor belt, and the side of the conveyor belt away from the rotating rod is connected to a twisted shaft. The twisted shaft is rotatably connected to the testing machine body, and the twisted shaft and the pull-out body are connected by a thread.

[0011] As a preferred embodiment of the present invention, a fifth spring is connected between the second wedge block and the connecting body, and an electromagnet is connected to the side of the connecting body near the fifth spring. The electromagnet and the second wedge block are attracted to each other by magnetic force.

[0012] Beneficial effects: 1. Through the cooperation of components such as the first wedge block, the second wedge block, the piston rod, and the air bag ring, this invention can automatically clamp the ping-pong ball through the air bag ring after the front of the ping-pong ball is qualified. Then, through the cooperation of the rack, gear, worm gear and worm, the rotating frame rotates and drives the air bag ring to rotate, automatically flipping the ping-pong ball.

[0013] 2. This invention uses an electromagnet, a detector, and a fifth spring to work together. When the detector detects that the ping-pong ball is defective, the electromagnet will drive the second wedge block to move forward and become misaligned with the first wedge block. In this way, when the second wedge block moves upward, the ping-pong ball will not flip over, thus determining that the ping-pong ball is defective. Attached Figure Description

[0014] Figure 1This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a partial three-dimensional structural cross-sectional view of the present invention.

[0016] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0017] Figure 4 For the present invention Figure 2 Enlarged view of section B in the middle.

[0018] Figure 5 This is a three-dimensional structural diagram of the connector, the fifth spring, the second wedge block, and the electromagnet of the present invention.

[0019] The markings in the diagram are as follows: 1-Detector body, 2-First cylinder, 3-Detector, 4-Cover, 5-Second cylinder, 6-Rotating frame, 7-Airbag ring, 8-Air cylinder, 9-One-way air pipe, 10-Piston rod, 11-First spring, 12-One-way inlet valve, 13-Outlet valve, 14-Worm gear, 15-Worm, 16-One-way gear, 17-First rack, 18-Extrusion rod, 19-Second spring, 191-Distance sensor, 20-First wedge block, 21-Third spring, 22-Connector, 23-Second wedge block, 24-Third wedge block, 25-Plate body, 26-Torsion spring, 27-Blocking component, 28-Pull-out body, 29-Fourth spring, 30-Bevel gear, 31-Rotating rod, 32-Conveyor belt, 33-Twisted shaft, 34-Fifth spring, 35-Electromagnet. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention.

[0021] A device for testing the hardness of plastic products, such as Figure 1 As shown, the device includes a detection body 1, on which a first cylinder 2 is provided. The end of the telescopic rod of the first cylinder 2 is connected to a detector 3. The detector 3 is used to detect the hardness of the ping-pong ball. The telescopic rod of the first cylinder 2 extends, causing the detection head to descend. After the detection head descends and contacts the ping-pong ball, it can automatically detect the hardness of the ping-pong ball.

[0022] like Figures 1-2As shown, the lower part of the detection body 1 has a groove, and the ping-pong ball is placed in the groove. When the detector 3 descends and squeezes the ping-pong ball, the ping-pong ball may be displaced, affecting the detection. Therefore, a second cylinder 5 is set on the side of the detection body 1 away from the first cylinder 2. The second cylinder 5 and the detector 3 are electrically connected through a control module. A cover 4 is set on the top of the telescopic rod of the second cylinder 5. The top of the cover 4 is used to hold the ping-pong ball. The cover 4 can limit the ping-pong ball to a certain extent and prevent the ping-pong ball from being displaced significantly during the detection.

[0023] The above only tests the top surface of the ping-pong ball. If the hardness of the back surface of the ping-pong ball needs to be tested, the ping-pong ball needs to be flipped over. As described in the background art, the ping-pong ball needs to be flipped over manually. Therefore, in this embodiment, a rotating frame 6 is provided on the side of the testing body 1 near the cover 4. The rotating frame 6 is rotatably connected to the testing body 1. An air bladder ring 7 is provided inside the rotating frame 6. After the detector 3 tests the top surface of the ping-pong ball, if the ping-pong ball passes the test, the back surface of the ping-pong ball needs to be tested. An inflation component is used to inflate the air bladder ring 7, so that the air bladder ring 7 first clamps the ping-pong ball, and then drives the rotating frame 6 to rotate, so that the rotating frame 6 drives the air bladder ring 7 and the ping-pong ball to rotate 180 degrees to flip them over. If the hardness of the ping-pong ball fails the test, it is not necessary to test the back surface of the ping-pong ball, and the ping-pong ball can be directly removed.

[0024] It should be noted that, since the cover 4 holds the ping-pong ball, and the rotating frame 6 rotates the airbag ring 7 and the ping-pong ball, the rotating frame 6 will squeeze the cover 4, which will cause the cover 4 to be damaged by compression. Therefore, after the ping-pong ball is clamped by the airbag ring 7 and before the ping-pong ball rotates, the cover 4 needs to be lowered by the telescopic rod of the second cylinder 5 to separate the cover 4 from the ping-pong ball so that the ping-pong ball can rotate.

[0025] like Figure 2 As shown, the inflation assembly includes an air cylinder 8, which is positioned on the side of the testing machine body 1 near the rotating frame 6. A one-way air pipe 9 is located at the top of the air cylinder 8, connecting to both the air cylinder 8 and the rotating frame 6. The one-way air pipe 9 allows gas to enter the airbag ring 7 in one direction, preventing leakage of large amounts of gas from the airbag ring 7. The rotating frame 6 is hollow and connected to the airbag ring 7. A piston rod 10 is slidably connected inside the air cylinder 8.

[0026] By pulling the piston rod 10 upward, the gas in the air cylinder 8 is inflated into the air bag ring 7 through the one-way air tube 9, thereby clamping the ping-pong ball in the air bag ring 7 for subsequent flipping. After the air bag ring 7 is inflated, the piston rod 10 needs to descend and reset. A first spring 11 is connected between the piston rod 10 and the air cylinder 8. The first spring 11 can drive the piston rod 10 to descend and reset. When the piston rod 10 descends, it will compress the gas inside the air cylinder 8. Because of the one-way air tube 9, the gas in the air bag ring 7 will not flow back into the air cylinder 8. However, a one-way air inlet valve 12 is set at the top of the air cylinder 8. Therefore, when the piston rod 10 descends, it will draw outside air into the air cylinder 8 through the one-way air inlet valve 12.

[0027] After the ping-pong ball is flipped over and tested again, it cannot be clamped indefinitely, otherwise it would be difficult to remove the ping-pong ball. Therefore, the air in the airbag ring 7 needs to be deflated to release the ping-pong ball. Thus, an air release valve 13 is connected to the side of the rotating frame 6 near the piston rod 10. Pressing the air release valve 13 can deflate the airbag ring 7.

[0028] As explained above, after the airbag ring 7 clamps the ping-pong ball, the rotating frame 6 needs to be driven to rotate to achieve the flip. Moreover, before the rotating frame 6 rotates, the cover 4 needs to be lowered by the second cylinder 5. Therefore, in this embodiment, the power of the second cylinder 5 is converted into the power of the rotating frame 6 to improve the practicality of the device, as detailed below:

[0029] like Figure 2 and Figure 4 As shown, a worm gear 14 is fixedly connected to the side of the rotating frame 6 away from the air cylinder 8. The worm gear 14 meshes with a worm 15. The worm 15 is rotatably connected to the testing machine body 1. A one-way gear 16 is fixedly connected to the worm 15. The one-way gear 16 meshes with a first rack 17. The first rack 17 is slidably connected to the testing machine body 1. A pressing rod 18 is connected to the telescopic rod of the second cylinder 5. The pressing rod 18 and the first rack 17 are pressed together below.

[0030] When the telescopic rod of the second cylinder 5 retracts, it drives the pressing rod 18 and the cover 4 to move downwards simultaneously. The cover 4 descends and first separates from the ping-pong ball. Then, when the pressing rod 18 contacts the first rack 17, it pushes the first rack 17 downwards. The descent of the first rack 17 drives the one-way gear 16 to rotate. The rotation of the one-way gear 16 drives the worm gear 15 to rotate, which in turn drives the worm wheel 14 to rotate. The rotation of the worm wheel 14 then drives the rotating frame 6 to rotate 180 degrees, thus achieving the purpose of flipping the ping-pong ball. After the ping-pong ball is flipped, the cylinder's telescopic rod needs to extend and reset, causing the cover 4 and the squeezing rod 18 to move upwards and reset. After the squeezing rod 18 moves upwards and separates from the first rack 17, the first rack 17 needs to move upwards and reset. For this purpose, a second spring 19 is connected between the first rack 17 and the detection body 1. The second spring 19 drives the first rack 17 to move upwards and reset. Under the action of the one-way gear 16, the worm gear 15 and worm wheel 14 will not reverse, so the rotating frame 6 will not reverse due to the reset of the cover 4.

[0031] As explained earlier, after the airbag ring 7 clamps the ping-pong ball, the second cylinder 5 needs to be activated. To this end, in this embodiment, a distance sensor 191 is set on the top of the air cylinder 8. The distance sensor 191 is electrically connected to the second cylinder 5 and the first cylinder 2 through a control module. When the upper part of the piston rod 10 descends, if the distance sensor 191 detects that the distance between itself and the piston rod 10 is less than the rated value, it will send a signal to the second cylinder 5 and the first cylinder 2. The second cylinder 5 can then start working, and at the same time, the first cylinder 2 also begins to extend. However, the extension speed of the extension rod of the first cylinder 2 is lower than that of the extension rod of the second cylinder 5. In this way, after the rotating frame 6 rotates, the detector 3 is still above the ping-pong ball and is still in the descending state.

[0032] The ping-pong ball needs to be flipped only after the hardness test of its top surface is passed. Moreover, as mentioned earlier, the piston rod 10 needs to be driven upward to achieve clamping and flipping. Therefore, this embodiment takes the following measures:

[0033] like Figure 2 and Figure 3 As shown, a first wedge block 20 is slidably connected to the piston rod 10, and a third spring 21 is connected between the first wedge block 20 and the piston rod 10. A connecting body 22 is fixedly connected to the telescopic rod of the first cylinder 2. A second wedge block 23 is provided on the side of the connecting body 22 away from the first cylinder 2. The second wedge block 23 and the first wedge block 20 are pressed together.

[0034] When the telescopic rod of the first cylinder 2 extends, it causes the connecting body 22 and the second wedge block 23 to descend. When the second wedge block 23 contacts the first wedge block 20, it drives the first wedge block 20 to move to the left, compressing the third spring 21. When the second wedge block 23 moves to the bottom of the first wedge block 20, the third spring 21 causes the first wedge block 20 to move to the right and press against the bottom of the second wedge block 23. Thus, when the telescopic rod of the first cylinder 2 retracts, it causes the connecting body 22 and the second wedge block 23 to move upward. When block 23 moves upward, it causes the first wedge block 20 to move upward, and the second wedge block 23 causes the piston rod 10 to move upward, thereby causing the airbag ring 7 to clamp the ping-pong ball. However, when the second wedge block 23 resets, the piston rod 10 will remain in an upward state, and the distance sensor 191 will not be triggered, causing the ping-pong ball to remain flipped. This will affect subsequent tests. Therefore, a third wedge block 24 is provided on the side of the detection body 1 near the second wedge block 23. The third wedge block 24 and the first wedge block 20 are pressed together.

[0035] When the second wedge block 23 moves upward, it will cause the first wedge block 20 to move upward. After the first wedge block 20 moves upward and comes into contact with the third wedge block 24, the third wedge block 24 will drive the first wedge block 20 to move to the left. After the first wedge block 20 and the third wedge block 24 separate, the piston rod 10 will move downward to reset. At the same time, the third spring 21 will drive the first wedge block 20 to move to the right to reset. In this way, the piston rod 10 can be automatically released, so that the piston rod 10 can descend.

[0036] When detector 3 needs to descend again to detect the reverse side of the ping-pong ball, and then rises back to reset after detection, piston rod 10 may still move upward, causing the ping-pong ball to be clamped and flipped again. Therefore, this embodiment includes the following components:

[0037] The first wedge block 20 is rotatably connected to the plate 25 on the side away from the third spring 21. The left part of the first wedge block 20 abuts against the left part of the plate 25. A torsion spring 26 is connected between the plate 25 and the first wedge block 20. A blocking member 27 is slidably connected to the side of the detection body 1 near the third wedge block 24. The blocking member 27 is pressed and engaged with the plate 25. The upper part of the blocking member 27 is pressed and engaged with the connecting body 22. A fourth spring 29 is connected between the blocking member 27 and the detection body 1. A pulling body 28 is slidably connected to the side of the detection body 1 near the blocking member 27. The pulling body 28 is pressed and engaged with the left part of the first wedge block 20.

[0038] When the rotating frame 6 rotates, the telescopic rod of the first cylinder 2 is also driving the connecting body 22 and the second wedge block 23 to descend. The blocking member 27 was originally in a state where it was pushed upward by the connecting body 22. When the connecting body 22 descends, the blocking member 27 will descend due to the fourth spring 29. At this time, the rotating frame 6 is still rotating. When the rotating frame 6 is rotating, the pulling body 28 will be driven to move to the left through the transmission component. The leftward movement of the pulling body 28 will pull the first wedge block 20 to the left. The leftward movement of the first wedge block 20 will drive the plate 25 to move to the left. After the plate 25 moves to the left, it will contact the lower part of the blocking member 27. The plate 25 will then rotate clockwise, and the torsion spring 26 will be twisted. When the plate 25 moves to the left of the blocking member 27, the torsion spring 26 will drive the plate 25 to rotate counterclockwise to reset. The plate 25 will then be blocked by the lower part of the blocking member 27. After the pulling body 28 moves to the left, it will move to the right to reset.

[0039] Thus, the first wedge 20 remains in a leftward position. Then, when the detector 3 and the second wedge 23 descend to perform detection, the second wedge 23 will not squeeze the first wedge 20. In this way, after the detection is completed, even if the detector 3 rises, the piston rod 10 will not move upward. When the connecting body 22 moves upward, it will squeeze the blocking member 27 and push the blocking member 27 upward to disengage from the plate 25. Then, the first wedge 20 will automatically move to the right to reset.

[0040] like Figure 2 and Figure 3 As shown, the transmission assembly includes a rotating rod 31, which is rotatably connected to the side of the testing machine body 1 near the ping-pong ball. The ends of the rotating rod 31 and the worm gear 15 are provided with bevel gears 30, which mesh with each other. The side of the rotating rod 31 away from the bevel gears 30 is connected to a conveyor belt 32, and the side of the conveyor belt 32 away from the rotating rod 31 is connected to a twisted shaft 33. The twisted shaft 33 is rotatably connected to the testing machine body 1, and the twisted shaft 33 is threadedly connected to the pull-out body 28.

[0041] When the worm gear 15 rotates, it drives the twisted shaft 33 to rotate 180 degrees through the bevel gear 30, rotating rod 31, and conveyor belt 32. The rotation of the twisted shaft 33 180 degrees can drive the first left movement and then the right movement to reset.

[0042] If detector 3 detects that the ping-pong ball is defective during its first inspection of the top surface, then there is no need to flip the ping-pong ball. However, the second wedge block 23 always engages with the first wedge block 20 during its first descent, which causes the defective ping-pong ball to be flipped. Therefore, this embodiment needs to take the following measures:

[0043] like Figure 5As shown, a fifth spring 34 is connected between the second wedge block 23 and the connecting body 22. An electromagnet 35 is connected to the side of the connecting body 22 near the fifth spring 34. The electromagnet 35 and the second wedge block 23 are attracted to each other by magnetic force. The electromagnet 35 and the detector 3 are electrically connected through the control module.

[0044] When detector 3 detects that the ping-pong ball is defective, electromagnet 35 will start working, causing the second wedge block 23 to move forward, the fifth spring 34 to be compressed, and the second wedge block 23 will be misaligned with the first wedge block 20. In this way, when the second wedge block 23 moves upward, it will not squeeze the first wedge block 20, and the ping-pong ball will not flip over. After the telescopic rod of the first cylinder 2 retracts and resets, electromagnet 35 will stop working, and the fifth spring 34 will drive the second wedge block 23 to move backward and reset.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for testing the hardness of plastic products, comprising a testing body (1), a first cylinder (2) mounted on the testing body (1), and a detector (3) connected to the end of the telescopic rod of the first cylinder (2), characterized in that: A second cylinder (5) is provided on the side of the detection body (1) away from the first cylinder (2). The second cylinder (5) and the detector (3) are electrically connected through a control module. A cover (4) is provided on the top of the telescopic rod of the second cylinder (5). A rotating frame (6) is provided on the side of the detection body (1) close to the cover (4). The rotating frame (6) and the detection body (1) are rotatably connected. An airbag ring (7) is provided inside the rotating frame (6).

2. The device for testing the hardness of plastic products according to claim 1, characterized in that, It also includes an air cylinder (8), which is set on the side of the testing machine body (1) near the rotating frame (6). The top of the air cylinder (8) is provided with a one-way air pipe (9), which is connected to the air cylinder (8) and the rotating frame (6). A first spring (11) is connected between the piston rod (10) and the air cylinder (8). A one-way air inlet valve (12) is set on the top of the air cylinder (8), and an air outlet valve (13) is connected on the side of the rotating frame (6) near the piston rod (10).

3. The device for testing the hardness of plastic products according to claim 2, characterized in that, It also includes a worm gear (14), which is fixedly connected to the side of the rotating frame (6) away from the air cylinder (8). The worm gear (14) meshes with the worm (15), which is rotatably connected to the testing body (1). A one-way gear (16) is fixedly connected to the worm (15), and the one-way gear (16) meshes with the first rack (17). The first rack (17) is slidably connected to the testing body (1). A pressing rod (18) is connected to the telescopic rod of the second cylinder (5), and the pressing rod (18) and the first rack (17) are pressed together below.

4. The device for testing the hardness of plastic products according to claim 3, characterized in that, It also includes a distance sensor (191), which is located on the top of the cylinder (8). The distance sensor (191) is electrically connected to the first cylinder (2) and the second cylinder (5) through the control module.

5. The device for testing the hardness of plastic products according to claim 4, characterized in that, A first wedge block (20) is slidably connected to the piston rod (10). A third spring (21) is connected between the first wedge block (20) and the piston rod (10). A connecting body (22) is fixedly connected to the telescopic rod of the first cylinder (2). A second wedge block (23) is provided on the side of the connecting body (22) away from the first cylinder (2). The second wedge block (23) and the first wedge block (20) are pressed together. A third wedge block (24) is provided on the side of the detection body (1) close to the second wedge block (23). The third wedge block (24) and the first wedge block (20) are pressed together.

6. The device for testing the hardness of plastic products according to claim 5, characterized in that, The first wedge block (20) is rotatably connected to the plate (25) on the side away from the third spring (21). The left part of the first wedge block (20) abuts against the left part of the plate (25). A torsion spring (26) is connected between the plate (25) and the first wedge block (20). The detection body (1) is slidably connected to the blocking member (27) on the side near the third wedge block (24). The blocking member (27) is pressed and engaged with the plate (25). The upper part of the blocking member (27) is pressed and engaged with the connecting body (22). A fourth spring (29) is connected between the blocking member (27) and the detection body (1). The detection body (1) is slidably connected to the pulling body (28) on the side near the blocking member (27). The pulling body (28) is pressed and engaged with the left part of the first wedge block (20).

7. The device for testing the hardness of plastic products according to claim 6, characterized in that, It also includes a rotating rod (31), which is rotatably connected to the side of the testing body (1) near the ping-pong ball. The ends of the rotating rod (31) and the worm gear (15) are provided with bevel gears (30), which mesh with each other. The side of the rotating rod (31) away from the bevel gears (30) is connected to a conveyor belt (32), and the side of the conveyor belt (32) away from the rotating rod (31) is connected to a twisted shaft (33). The twisted shaft (33) is rotatably connected to the testing body (1), and the twisted shaft (33) and the pull-out body (28) are threadedly connected.

8. The device for testing the hardness of plastic products according to claim 7, characterized in that, The second wedge (23) is connected to the fifth spring (34) and the connecting body (22). The connecting body (22) is connected to the electromagnet (35) on the side closer to the fifth spring (34). The electromagnet (35) and the second wedge (23) are attracted to each other by magnetic force.

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