Composite testing machine for abrasion and fracture of polymer cable

Abstract

The invention relates to the technical field of cable processing, and discloses a polymer cable wear and fracture composite testing machine, which comprises a processing platform and a polymer cable, the bottom of the processing platform is provided with a storage cabinet, the top of the processing platform is fixedly connected with two first vertical plates, the right sides of the first vertical plates are fixedly connected with a hydraulic motor, and the hydraulic motor is fixedly connected with the polymer cable. A motor sliding rail, a linear motor, a movable plate, a third vertical plate, a second vertical plate, a ball and a conical gear ring are arranged to move front and back, a 3D scanner is driven to move in the horizontal direction to overall scan a macromolecule cable from back to front, a rack, a transmission gear and a conical gear are arranged to rotate, the conical gear rotates, and the conical gear rotates to drive the 3D scanner to rotate. And the 3D scanner can scan and record the wear and fracture conditions of the polymer cable from various angles, so that the measurement accuracy of the wear and fracture test result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable processing, in particular to a polymer cable wear and breakage composite testing machine. Background Art

[0002] Polymer cable is a rope made of polymer material, which has the advantages of high strength, low weight, corrosion resistance and wear resistance. It is widely used in marine engineering, aerospace, military, industrial lifting and outdoor sports. After manufacturing, polymer cable needs to undergo a number of tests such as grinding and breaking to ensure its durability. Polymer cable usually needs to be tested by wear testing machine.

[0003] In the prior art, the actual wear and breakage of the cable is usually recorded by using multiple cameras fixed at different positions. However, there may be blind spots between the multiple cameras, which may reduce the data accuracy of the wear test. Therefore, a polymer cable wear and breakage composite testing machine is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a polymer cable wear and breakage composite testing machine in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a polymer cable wear and breakage composite testing machine, including a processing platform and a polymer cable, a storage cabinet is arranged at the bottom of the processing platform, and two first vertical plates are fixedly connected to the top of the processing platform, a hydraulic motor is fixedly connected to the right side of the first vertical plate, and the left output end of the hydraulic motor passes through the left side of the first vertical plate, and is fixedly connected to a rope winding roller through a coupling, and the front and rear ends of the polymer cable are respectively wound on the two rope winding rollers, and the two rope winding rollers are driven to rotate by turning on the two hydraulic motors, and the front and rear ends of the polymer cable are pulled, so as to perform a pulling and breaking test on the polymer cable.

[0006] A detection mechanism is provided on the top of the processing platform, and the detection mechanism includes a motor slide rail, a linear motor, a movable plate, a second vertical plate, a conical gear ring, an annular slide rail, three ball bearings, and a 3D scanner; The motor slide is fixedly connected to the top of the processing platform, the linear motor is arranged on the motor slide, the movable plate is arranged on the linear motor, and the movable plate is driven to move forward and backward by the linear motor, the second vertical plate is fixedly connected to the top of the movable plate, the annular slide is opened on the back of the conical gear ring, the three ball bearings are slidably connected to the inside of the annular slide, the rear ends of the three ball bearings are fixedly connected to the second vertical plate through a connecting rod, the 3D scanner is fixedly connected to the inner wall of the conical gear ring, the conical gear ring is sleeved on the outside of the polymer cable, the ball bearings and the annular slide are arranged to provide support force for the conical gear ring, and the 3D scanner is driven to move forward and backward by the linear motor while scanning and detecting the polymer cable.

[0007] Preferably, the top of the movable plate is fixedly connected to a third vertical plate, the right side of the third vertical plate is rotatably connected to a transmission gear through an axis, the top of the processing platform is fixedly connected to a rack through a vertical rod, the transmission gear is meshed with the rack, the right side of the transmission gear is fixedly connected to a bevel gear, the bevel gear is meshed with a bevel gear ring, and the movable plate moves forward to drive the 3D scanner to rotate around the polymer cable for scanning and detection through the rack, transmission gear, bevel gear and bevel gear ring.

[0008] Preferably, a grinding mechanism is provided on the front side of the conical gear ring, and the grinding mechanism includes three connecting rods, the connecting rods are fixedly connected to the inner wall of the conical gear ring, the front end of the connecting rods is fixedly connected to an outer ring, the interior of the outer ring is slidably connected to an inner ring, the inner ring is sleeved on the outside of the polymer cable, the front side of the inner ring is hinged with a first movable rod through a rotating rod, the other end of the first movable rod away from the rotating rod is provided with an electric grinding wheel, the electric grinding wheel is in contact with the polymer cable, and the outer surface of the polymer cable is polished by the three electric grinding wheels, thereby performing a wear test.

[0009] Preferably, three first sliding grooves are opened on the front side of the inner ring, and the first sliding grooves are slidably connected to the inside of the first sliding grooves with first sliders, and the front ends of the three first sliders are fixedly connected to the back sides of the three first movable rods respectively, and the movement of the first slider is limited by setting the first sliding grooves.

[0010] Preferably, a plurality of slots are provided on the front of the outer ring, a second movable rod is hinged on the front of the inner ring, a clamping block is fixedly connected to the bottom end of the second movable rod, the clamping block is clamped with the slots, and the clamping block, the second movable rod and the inner ring are fixed by setting the slots.

[0011] Preferably, a dust suction mechanism is provided on the top of the movable plate, and the dust suction mechanism includes three electric fans, and the three electric fans are respectively fixedly connected to the opposite sides of the three connecting rods. By turning on the three electric fans, wind force is generated to blow off the debris attached to the surface of the polymer cable due to grinding by the electric grinding wheel, thereby improving the scanning accuracy of the 3D scanner for the polymer cable.

[0012] Preferably, the top of the movable plate is fixedly connected to a support rod, the rear end of the support rod is fixedly connected to a wind collecting hood, the top of the wind collecting hood is provided with a dust collecting tank, one side of the dust collecting tank is connected to the top of the wind collecting hood through a pipe, and the interior of the dust collecting tank is provided with a fan, and the fan generates suction to suck the debris generated by the electric grinding wheel grinding the polymer cable into the dust collecting tank through the wind collecting hood and the pipe, thereby avoiding the generation of dust.

[0013] Preferably, the bottom end of the pipe is fixedly connected to a filter screen, the inner wall of the wind collecting hood is provided with a second slide groove on the front and rear sides, a cross bar is slidably connected between the two second slide grooves, the top end of the cross bar is fixedly connected to a third vertical rod, the top of the third vertical rod is fixedly connected to a disk, the top of the disk is fixedly connected to a ejector pin, and impurities blocked in the filter screen are cleared by providing the ejector pin, and a ejector block is fixedly connected to the outer side of the outer ring, the ejector block contacts with the bottom of the cross bar, and the rotation of the outer ring drives the ejector block to rotate, and when it contacts with the bottom of the cross bar, the cross bar, the third vertical rod, the disk and the ejector pin are pushed upward.

[0014] The present invention adopts the above technical solution to bring the following beneficial effects: 1. The invention sets up a detection mechanism, and uses a linear motor to drive the movable plate to move back and forth on the motor slide rail, so that the 3D scanner can scan the polymer cable as a whole and obtain the wear and breakage information of different positions of the cable. At the same time, when the movable plate moves, the rack drives the transmission gear to rotate, and then the bevel gear drives the bevel gear ring to rotate, allowing the 3D scanner to rotate around the cable. Scanning from different angles can fully capture the wear and breakage details of the cable, avoid omissions, improve the measurement accuracy of the wear and breakage test results, and provide a reliable basis for evaluating the quality of the cable.

[0015] 2. The invention ensures the effectiveness and efficiency of the wear test by closely cooperating with the grinding mechanism and the detection mechanism. When the conical gear ring rotates, the outer ring is driven to rotate through the connecting rod, and the outer ring then drives the inner ring and the electric grinding wheel to rotate, so as to evenly grind the outer surface of the polymer cable, simulate the wear of the cable in actual use, and accurately reflect its wear resistance. The design of the first slide groove and the first slider allows the electric grinding wheel to remain stable when moving, ensuring the grinding effect. In addition, the card slot, the second movable rod and the card block cooperate with each other to quickly adjust the distance between the electric grinding wheels to adapt to cables of different diameters without replacing equipment or grinding wheels, thereby improving test efficiency.

[0016] 3. The invention sets up a dust suction mechanism, which is closely related to the grinding and testing process, to ensure the detection accuracy and maintain the cleanliness of the test environment. The electric fan blows off the debris generated by the electric grinding wheel to prevent the debris from adhering to the surface of the cable and interfering with the scanning of the 3D scanner, thereby improving the scanning accuracy. The dust collecting tank, the pipe and the wind hood cooperate with each other, and the fan generates suction to suck the debris into the dust collecting tank to prevent dust, keep the test environment clean and tidy, and provide good conditions for the detection work. When the outer ring rotates, the top block pushes the cross bar to move the ejector pin upward to clear the filter, thereby ensuring the smooth flow of the pipe and the filter, maintaining the dust suction effect, further ensuring the measurement accuracy of the 3D scanner, and ensuring the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the hydraulic motor area structure in the present invention; Figure 3 It is an exploded view of the polymer cable area in the present invention; Figure 4 It is a schematic diagram of the structure of the conical gear ring area in the present invention; Figure 5 A cross-sectional view showing a schematic diagram of the side structure of the conical gear ring region in the present invention; Figure 6 It is a schematic diagram of the structure of the outer annular region in the present invention; Figure 7 It is a cross-sectional view of the exploded view of the outer annular region in the present invention; Figure 8 It is a schematic diagram of the structure of the hurricane cover area in the present invention; Fig. 9 It is a partial schematic diagram of the internal cross-sectional view of the wind collecting hood area in the present invention.

[0018] In the figure: 1. Processing platform; 101. Locker; 201. First vertical plate; 202. Hydraulic motor; 203. Rope winding roller; 3. Polymer cable; 4. Detection mechanism; 401. Motor slide rail; 402. Linear motor; 403. Movable plate; 404. Second vertical plate; 405. Conical gear ring; 406. Annular slide rail; 407. Ball bearing; 408. 3D scanner; 409. Third vertical plate; 4010. Transmission gear; 4011. Rack; 4012. Conical gear; 5. Grinding mechanism; 501. Connecting rod; 502 , outer ring; 503, inner ring; 504, rotating rod; 505, first movable rod; 506, electric grinding wheel; 507, first slide groove; 508, first slider; 509, slot; 5010, second movable rod; 5011, block; 6, dust suction mechanism; 601, electric fan; 602, support rod; 603, wind hood; 604, pipeline; 605, dust collecting tank; 606, filter; 607, second slide groove; 608, horizontal rod; 609, third vertical rod; 6010, disc; 6011, ejector pin; 6012, ejector block. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1-9 One embodiment of the present invention is: a polymer cable wear and breakage composite testing machine, including a processing platform 1 and a polymer cable 3. A storage cabinet 101 is arranged at the bottom of the processing platform 1. Two first vertical plates 201 are fixedly connected to the top of the processing platform 1. A hydraulic motor 202 is fixedly connected to the right side of the first vertical plate 201. The left output end of the hydraulic motor 202 passes through the left side of the first vertical plate 201 and is fixedly connected to a rope winding roller 203 through a coupling. The front and rear ends of the polymer cable 3 are respectively wound on the two rope winding rollers 203. By turning on the two hydraulic motors 202, the two rope winding rollers 203 are driven to rotate, and the front and rear ends of the polymer cable 3 are pulled, so as to perform a pulling and breaking test on the polymer cable 3.

[0021] A detection mechanism 4 is provided on the top of the processing platform 1, and the detection mechanism 4 includes a motor slide rail 401, a linear motor 402, a movable plate 403, a second vertical plate 404, a conical gear ring 405, an annular slide rail 406, three ball bearings 407, and a 3D scanner 408; The motor slide 401 is fixedly connected to the top of the processing platform 1, the linear motor 402 is arranged on the motor slide 401, and the movable plate 403 is arranged on the linear motor 402. The movable plate 403 is driven to move forward and backward by the linear motor 402. The second vertical plate 404 is fixedly connected to the top of the movable plate 403, the annular slide 406 is opened on the back of the conical gear ring 405, and three balls 407 are slidably connected to the inside of the annular slide 406. The rear ends of the three balls 407 are fixedly connected to the second vertical plate 404 through a connecting rod. The 3D scanner 408 is fixedly connected to the inner wall of the conical gear ring 405, and the conical gear ring 405 is sleeved on the outside of the polymer cable 3. The ball 407 and the annular slide 406 are arranged to provide support for the conical gear ring 405. The linear motor 402 is arranged to drive the 3D scanner 408 to move forward and backward while scanning and detecting the polymer cable 3.

[0022] The top of the movable plate 403 is fixedly connected to the third vertical plate 409, and the right side of the third vertical plate 409 is rotatably connected to the transmission gear 4010 through an axis. The top of the processing platform 1 is fixedly connected to the rack 4011 through a vertical rod, and the transmission gear 4010 is meshed with the rack 4011. The right side of the transmission gear 4010 is fixedly connected to a bevel gear 4012, and the bevel gear 4012 is meshed with the bevel gear ring 405. The movable plate 403 moves forward and drives the 3D scanner 408 to rotate around the polymer cable 3 through the rack 4011, the transmission gear 4010, the bevel gear 4012, and the bevel gear ring 405 to perform scanning and detection.

[0023] Working principle: by turning on the two hydraulic motors 202 to drive the two rope winding rollers 203 to rotate, and pulling the front and rear ends of the polymer cable 3, the polymer cable 3 is subjected to a pulling and breaking test, and by turning on the linear motor 402 to drive the movable plate 403 to move from back to front, the movable plate 403 moves forward to drive the third vertical plate 409 to move forward, the third vertical plate 409 moves forward to drive the transmission gear 4010 to rotate through the rack 4011, the transmission gear 4010 rotates to drive the bevel gear 4012 to rotate, the bevel gear 4012 rotates to drive the bevel gear ring 405 to rotate, the bevel gear ring 405 rotates to drive the 3D scanner 408 to rotate and perform a rotational scan around the polymer cable 3, the movable plate 403 moves forward to drive the second vertical plate 404, the ball 407 and the bevel gear ring 405 to move forward, and drive the 3D scanner 408 to scan the polymer cable 3 as a whole from back to front.

[0024] See also Figure 1-9On the basis of the above embodiment, in another embodiment of the present invention, a grinding mechanism 5 is arranged on the front side of the conical gear ring 405, and the grinding mechanism 5 includes three connecting rods 501, and the connecting rods 501 are fixedly connected to the inner wall of the conical gear ring 405, and the front end of the connecting rods 501 is fixedly connected to an outer ring 502, and the inner part of the outer ring 502 is slidably connected to an inner ring 503, and the inner ring 503 is sleeved on the outer side of the polymer cable 3, and the front side of the inner ring 503 is hinged with a first movable rod 505 through a rotating rod 504, and the other end of the first movable rod 505 away from the rotating rod 504 is provided with an electric grinding wheel 506, and the electric grinding wheel 506 is in contact with the polymer cable 3, and the outer surface of the polymer cable 3 is ground by the three electric grinding wheels 506, so as to carry out a wear test.

[0025] Three first slide grooves 507 are provided on the front side of the inner ring 503, and the first slide grooves 507 are slidably connected to the inside of the first slide grooves 507. The front ends of the three first slide slides 508 are fixedly connected to the back sides of the three first movable rods 505 respectively, and the movement of the first slide slide 508 is limited by setting the first slide grooves 507.

[0026] A plurality of slots 509 are provided on the front of the outer ring 502, a second movable rod 5010 is hinged on the front of the inner ring 503, a block 5011 is fixedly connected to the bottom end of the second movable rod 5010, the block 5011 is engaged with the slots 509, and the slots 509 are provided to fix the block 5011, the second movable rod 5010 and the inner ring 503.

[0027] Working principle: When the conical gear ring 405 rotates, the outer ring 502 is driven to rotate through the connecting rod 501, and the outer ring 502 rotates through the slot 509, the block 5011, and the second movable rod 5010 to drive the inner ring 503 to rotate. The outer ring 502 and the inner ring 503 rotate through the rotating rod 504 and the first movable rod 505 to drive the three electric grinding wheels 506 to uniformly grind the outer wall of the polymer cable 3 at the same time. When it is necessary to perform a grinding test on polymer cables 3 with different diameters, the block 5011 can be removed from the slot 509, and the inner ring 503 can be rotated while the outer ring 502 is fixed, thereby rotating the first movable rod 505 and adjusting the distance between the three electric grinding wheels 506, thereby performing a grinding experiment on the outer walls of polymer cables 3 with different diameters.

[0028] See also Figure 1-9On the basis of the above embodiment, in another embodiment of the present invention, a dust suction mechanism 6 is arranged on the top of the movable plate 403, and the dust suction mechanism 6 includes three electric fans 601, and the three electric fans 601 are respectively fixedly connected to the opposite sides of the three connecting rods 501. By turning on the three electric fans 601, wind force is generated to blow off the debris attached to the surface of the polymer cable 3 caused by the grinding of the electric grinding wheel 506, thereby improving the scanning accuracy of the 3D scanner 408 on the polymer cable 3.

[0029] The top of the movable plate 403 is fixedly connected to a support rod 602, and the rear end of the support rod 602 is fixedly connected to a wind collecting hood 603. A dust collecting tank 605 is arranged on the top of the wind collecting hood 603. One side of the dust collecting tank 605 is connected to the top of the wind collecting hood 603 through a pipe 604. A fan is arranged inside the dust collecting tank 605. The fan generates suction to suck the debris generated by the electric grinding wheel 506 grinding the polymer cable 3 into the dust collecting tank 605 through the wind collecting hood 603 and the pipe 604, thereby avoiding the generation of dust.

[0030] A filter screen 606 is fixedly connected to the bottom end of the pipe 604, and second slide grooves 607 are provided on the front and rear sides of the inner wall of the wind collecting cover 603. A cross bar 608 is slidably connected between the two second slide grooves 607. A third vertical rod 609 is fixedly connected to the top of the cross bar 608, a disc 6010 is fixedly connected to the top of the third vertical rod 609, and a top pin 6011 is fixedly connected to the top of the disc 6010. The impurities blocked in the filter screen 606 are cleared by setting the top pin 6011. A top block 6012 is fixedly connected to the outer side of the outer ring 502, and the top block 6012 contacts with the bottom of the cross bar 608. The rotation of the outer ring 502 drives the top block 6012 to rotate, and when it contacts with the bottom of the cross bar 608, the cross bar 608, the third vertical rod 609, the disc 6010 and the top pin 6011 are pushed upward.

[0031] Working principle: The fan generates suction to suck the debris generated by the electric grinding wheel 506 grinding the polymer cable 3 into the dust collecting tank 605 through the wind collecting hood 603 and the pipe 604, so as to avoid the generation of dust; the outer ring 502 rotates to drive the top block 6012 to rotate, and when it contacts the bottom of the cross bar 608, it pushes the cross bar 608, the third vertical bar 609, and the disk 6010 upward, and drives the ejector pin 6011 to move upward and insert into the filter 606, so as to clear the impurities blocked in the filter 606.

[0032] The present invention provides a polymer cable wear and breakage composite testing machine. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A polymer cable wear and breakage composite testing machine, comprising a processing platform (1) and a polymer cable (3), characterized in that: A storage cabinet (101) is provided at the bottom of the processing platform (1), and two first vertical plates (201) are fixedly connected to the top of the processing platform (1), a hydraulic motor (202) is fixedly connected to the right side of the first vertical plate (201), a left output end of the hydraulic motor (202) passes through the left side of the first vertical plate (201), and is fixedly connected to a rope winding roller (203) via a coupling, and the front and rear ends of the polymer cable (3) are respectively wound on the two rope winding rollers (203); A detection mechanism (4) is arranged on the top of the processing platform (1), and the detection mechanism (4) comprises a motor slide rail (401), a linear motor (402), a movable plate (403), a second vertical plate (404), a conical gear ring (405), an annular slide rail (406), three ball bearings (407), and a 3D scanner (408); The motor slide rail (401) is fixedly connected to the top of the processing platform (1), the linear motor (402) is arranged on the motor slide rail (401), the movable plate (403) is arranged on the linear motor (402), the second vertical plate (404) is fixedly connected to the top of the movable plate (403), the annular slide rail (406) is opened on the back of the conical gear ring (405), the three balls (407) are slidably connected to the inside of the annular slide rail (406), the rear ends of the three balls (407) are fixedly connected to the second vertical plate (404) through a connecting rod, the 3D scanner (408) is fixedly connected to the inner wall of the conical gear ring (405), and the conical gear ring (405) is sleeved on the outside of the polymer cable (3).

2. A polymer cable wear and breakage composite testing machine according to claim 1, characterized in that: The top of the movable plate (403) is fixedly connected to a third vertical plate (409), the right side of the third vertical plate (409) is rotatably connected to a transmission gear (4010) via an axis, the top of the processing platform (1) is fixedly connected to a rack (4011) via a vertical rod, the transmission gear (4010) meshes with the rack (4011), the right side of the transmission gear (4010) is fixedly connected to a bevel gear (4012), and the bevel gear (4012) meshes with a bevel gear ring (405).

3. A polymer cable wear and breakage composite testing machine according to claim 2, characterized in that: A grinding mechanism (5) is arranged on the front side of the conical gear ring (405), and the grinding mechanism (5) comprises three connecting rods (501), the connecting rods (501) are fixedly connected to the inner wall of the conical gear ring (405), the front end of the connecting rods (501) is fixedly connected to an outer ring (502), the interior of the outer ring (502) is slidably connected to an inner ring (503), the inner ring (503) is sleeved on the outside of the polymer cable (3), the front side of the inner ring (503) is hinged with a first movable rod (505) through a rotating rod (504), and the other end of the first movable rod (505) away from the rotating rod (504) is provided with an electric grinding wheel (506), and the electric grinding wheel (506) is in contact with the polymer cable (3).

4. A polymer cable wear and breakage composite testing machine according to claim 3, characterized in that: The front surface of the inner ring (503) is provided with three first sliding grooves (507), the interior of the first sliding grooves (507) is slidably connected with first sliding blocks (508), and the front ends of the three first sliding blocks (508) are fixedly connected to the back surfaces of the three first movable rods (505) respectively.

5. A polymer cable wear and breakage composite testing machine according to claim 4, characterized in that: The front side of the outer ring (502) is provided with a plurality of slots (509); the front side of the inner ring (503) is hinged with a second movable rod (5010); the bottom end of the second movable rod (5010) is fixedly connected with a clamping block (5011); the clamping block (5011) is clamped with the slots (509).

6. A polymer cable wear and breakage composite testing machine according to claim 5, characterized in that: A dust suction mechanism (6) is provided on the top of the movable plate (403), and the dust suction mechanism (6) comprises three electric fans (601). The three electric fans (601) are respectively fixedly connected to opposite sides of the three connecting rods (501).

7. A polymer cable wear and breakage composite testing machine according to claim 6, characterized in that: The top of the movable plate (403) is fixedly connected to a support rod (602), the rear end of the support rod (602) is fixedly connected to an air collecting hood (603), a dust collecting tank (605) is arranged on the top of the air collecting hood (603), one side of the dust collecting tank (605) is connected to the top of the air collecting hood (603) via a pipe (604), and a fan is arranged inside the dust collecting tank (605).

8. A polymer cable wear and breakage composite testing machine according to claim 7, characterized in that: The bottom end of the pipe (604) is fixedly connected with a filter screen (606), the inner wall of the air collecting hood (603) is provided with second slide grooves (607) on both sides, a cross bar (608) is slidably connected between the two second slide grooves (607), the top of the cross bar (608) is fixedly connected with a third vertical bar (609), the top of the third vertical bar (609) is fixedly connected with a disk (6010), the top of the disk (6010) is fixedly connected with a top pin (6011), the outer side of the outer ring (502) is fixedly connected with a top block (6012), and the top block (6012) is in contact with the bottom of the cross bar (608).

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