Cable with bending durability

Abstract

The invention relates to the technical field of cables, and provides a cable with bending durability, the cable comprises a cable body, the cable body comprises an insulating sheath and a plurality of cable cores, the cable body further comprises a hollow positioning disc and a plurality of cable core butt joint mechanisms with a telescopic locking function, the hollow positioning disc is communicated with an air pressure adjusting assembly, and the cable core butt joint mechanisms are arranged on the hollow positioning disc. The cable core butt joint mechanisms are in one-to-one correspondence with the cable cores and are used for positioning and conducting the cable cores and extending the cable cores, each cable core butt joint mechanism comprises a positioning ring, a telescopic positioning assembly, a positioning reset spring and a conductive spring, the positioning rings are arranged on the hollow positioning disc in a sealing and penetrating mode, and the telescopic positioning assemblies are arranged on the positioning rings; and a plurality of air inlet through holes are formed between the positioning ring and the hollow positioning disc. By means of the technical scheme, the problem that in the prior art, when a bent durable cable is applied to a drag chain system, the abrasion degree is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a cable with bending durability. Background Art

[0002] Cables with bending durability are those designed to withstand high numbers of bends in continuous motion without being damaged. Such cables usually have extremely high bending durability and can withstand millions of bends without being damaged. They are mainly used in application scenarios that require frequent movement or bending, such as industrial robots, drag chain systems, etc.

[0003] However, although cables with bending durability can withstand a high number of bendings, the biggest drawback of most cables with bending durability when used in drag chain systems is poor wear resistance. No matter how excellent the cable insulation sheath is, high-intensity bending in a drag chain system and friction between the cable and the drag chain will cause cable damage within a certain period of time. In order to increase the service life of cables with bending durability in drag chain systems and prevent friction between the cable and the drag chain, a cable with bending durability is proposed. Summary of the invention

[0004] The present invention provides a cable with bending durability, so as to solve the problem mentioned in the background art that the bending durability cable in the prior art has a large degree of wear when used in a drag chain system.

[0005] The technical solution of the present invention is as follows: a cable with bending durability, comprising a cable body, the cable body comprising an insulating sheath and a plurality of cable cores, and also comprising a hollow positioning disk and a cable core docking mechanism with a telescopic locking function; The hollow positioning plate is connected to an air pressure regulating component; There are multiple cable core docking mechanisms, each of which corresponds to the cable cores one by one, and is used to position and conduct the cable cores, and is also used to extend the cable cores; Wherein, the cable core docking mechanism comprises a positioning ring, a telescopic positioning component, a positioning reset spring and a conductive spring; The positioning ring is sealed and penetrates the hollow positioning disk, and a plurality of air inlet holes are provided between the positioning ring and the hollow positioning disk; The telescopic positioning components are provided with two, and the two telescopic positioning components are symmetrical and sealingly slidably arranged on both sides of the positioning ring; The positioning reset spring is arranged between the two telescopic positioning assemblies and is used to reset the telescopic positioning assembly; The conductive spring is arranged between the two telescopic positioning components, and the conductive spring is located inside the positioning reset spring for conducting electricity.

[0006] As a preferred technical solution of the present application, the telescopic positioning assembly includes a telescopic portion with angle adjustment, a wire positioning portion, a wire skin positioning portion and a pneumatic positioning portion; The telescopic portion is sealed and slidably arranged on one side of the positioning ring; The wire positioning part is arranged in the telescopic part, and the wire positioning part is connected to the conductive spring, and is used to fix the wire in the cable core; The wire sheath positioning part is arranged in the telescopic part, and the wire sheath positioning part is arranged in the telescopic part, and is used to fix the insulation layer of the cable core; One end of the pneumatic positioning part is communicated with the hollow positioning disk, and the other end of the pneumatic positioning part is communicated with the wire positioning part and the wire skin positioning part.

[0007] Further on the basis of the above solution, the telescopic part includes an extension sleeve, a steering ball and a steering tube; The extension sleeve is sealed and slidably connected to one side of the positioning ring; The steering ball is sealed and rotatably arranged on a side of the extension sleeve away from the positioning ring, and one end of the positioning return spring is connected to an end of the steering ball close to the positioning ring; The steering tube penetrates into the steering ball, and the wire positioning portion and the wire skin positioning portion are both arranged in the steering tube.

[0008] Further on the basis of the above scheme, the wire positioning part includes a conductive plate, a conductive hollow positioning cylinder, a positioning column and a wire air inlet pipe; The conductive plate is sealed and arranged in the steering tube, and one end of the conductive spring is connected to one end of the conductive plate; The conductive hollow positioning cylinder is arranged on a side of the conductive plate away from the conductive spring; There are a plurality of positioning posts, which penetrate and are sealed and slidably arranged in the conductive hollow positioning cylinder, and a wire positioning cavity is formed between the plurality of positioning posts; One end of the wire air inlet pipe is sealed and connected to the conductive hollow positioning tube, and the other end of the wire air inlet pipe penetrates to the outside of the steering tube.

[0009] Further on the basis of the above scheme, the wire skin positioning part includes a rubber positioning tube and a wire skin air inlet pipe; The rubber positioning tube is arranged on the inner wall of the steering tube; One end of the wire skin air intake pipe is communicated with the rubber positioning pipe, and the other end of the wire skin air intake pipe penetrates to the outside of the steering pipe.

[0010] Further on the basis of the above scheme, the pneumatic positioning part includes a telescopic positioning tube, a positioning elbow and a one-way air inlet valve; One end of the telescopic positioning tube is connected to the hollow positioning plate; One end of the positioning elbow is connected to the other end of the telescopic positioning pipe, and the other end of the positioning elbow is connected to the wire air inlet pipe and the wire skin air inlet pipe; The one-way air intake valve is installed on the positioning elbow.

[0011] On the basis of the above scheme, the air pressure regulating assembly includes a pressure regulating positioning frame, a pressure regulating cylinder, a pressure regulating slider and a pressure regulating electric cylinder; The pressure regulating positioning frame is arranged on the hollow positioning plate; The pressure regulating cylinder is arranged on the pressure regulating positioning frame, and one end of the pressure regulating cylinder is connected to the hollow positioning disk; The pressure regulating sliding block is sealed and slidably arranged in the pressure regulating cylinder; The pressure regulating electric cylinder is installed on the pressure regulating positioning frame, and the output end of the pressure regulating electric cylinder is connected to an end of the pressure regulating sliding block away from the hollow positioning plate.

[0012] The working principle and beneficial effects of the present invention are: 1. When the present invention is installed in a drag chain system, the voltage regulating positioning frame is first installed at the bending position of the drag chain system, and the multi-strand cable core part in the cable body is separated from the insulating outer skin. Then, according to the length of the conductive hollow positioning cylinder, the insulating skin of the corresponding length on the cable core is removed, and the wires in each cable core are respectively inserted into the corresponding wire positioning cavities, and then the voltage regulating electric cylinder is started, and the output end of the voltage regulating electric cylinder drives the voltage regulating slider to move, so that the voltage regulating slider moves toward the hollow positioning disk, and the gas in the pressure regulating cylinder is squeezed into the hollow positioning disk by the movement of the voltage regulating slider, so that the air pressure in the hollow positioning disk is increased. When the air pressure in the hollow positioning disk increases, the gas will enter the positioning ring through the air inlet hole. As the air pressure in the positioning ring increases, under the action of pressure, the extension sleeve, the steering ball and the steering tube move in a direction away from the positioning ring. The positioning reset spring can be stretched and deformed by the movement of the steering ball, and the movement of the extension sleeve can indirectly increase the length of the cable core, so as to prevent excessive friction movement between the cable body and the drag chain system during the bending process of the drag chain system.

[0013] 2. In the present invention, when the air pressure in the hollow positioning disk increases, the gas will also pass through the telescopic positioning tube, the positioning elbow and the one-way air inlet valve, and then enter the conductive hollow positioning cylinder and the rubber positioning tube through the wire air inlet pipe and the wire skin air inlet pipe respectively. When the air pressure in the conductive hollow positioning tube increases, under the action of pressure, the positioning column will move toward one side of the wire, so that the positioning column contacts the wire, and the position of the wire is fixed. At the same time, the electricity conducted by the wire can be conducted to one side of the conductive spring along the positioning column, the conductive hollow positioning tube and the conductive plate. When the air pressure in the rubber positioning tube increases, the rubber positioning tube itself expands and deforms to contact the insulating layer on the surface of the cable core, and the position of the cable core is fixed. At the same time, it can effectively prevent the contact between the external gas and the wire, and prevent the wire from being oxidized; 3. According to the present invention, after the cable body is installed in the corresponding steering tube, as the drag chain system bends, driven by the cable core, the steering ball and the steering tube can be rotated at any angle on one side of the extension sleeve, so that the cable body can move arbitrarily with the drag chain system. The output end of the pressure regulating electric cylinder drives the pressure regulating slider to adjust the air pressure in the hollow positioning disk, and under the extension of the positioning reset spring and the conductive spring, the length of the cable core at the bending part of the drag chain system can be adjusted through the contraction and deformation of the telescopic positioning tube. When installing the cable body, the cable body can be directly fixed at the non-bending part of the drag chain system, and the wire core docking mechanism is only set at the bending part of the drag chain system, which can effectively prevent the friction between the cable body and the drag chain system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a schematic diagram of the structure of a partial cross-section of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle; Figure 3 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B in the middle; Figure 4 For the present invention Figure 1 A schematic diagram of the local enlarged structure at C in the middle; Figure 5 It is a structural schematic diagram of a partial cross-section of the cable core docking mechanism in the present invention; Figure 6 It is a schematic diagram of the overall structure of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the local enlarged structure at point D in the middle.

[0016] In the figure: 001, air pressure regulating assembly; 002, cable core docking mechanism; 1. Insulating outer skin; 2. Cable core; 3. Hollow positioning disk; 4. Positioning ring; 5. Positioning reset spring; 6. Conductive spring; 7. Extension sleeve; 8. Steering ball; 9. Steering tube; 10. Conductive plate; 11. Conductive hollow positioning cylinder; 12. Positioning column; 13. Wire air inlet pipe; 14. Rubber positioning tube; 15. Wire air inlet pipe; 16. Telescopic positioning tube; 17. Positioning elbow; 18. One-way air inlet valve; 19. Pressure regulating positioning frame; 20. Pressure regulating tube; 21. Pressure regulating slider; 22. Pressure regulating electric cylinder. DETAILED DESCRIPTION

[0017] The following will be combined with 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.

[0018] like Figures 1 to 7 As shown, this embodiment proposes a cable with bending durability, including a cable body, the cable body including an insulating sheath 1 and a plurality of cable cores 2, and also including a hollow positioning plate 3 and a cable core docking mechanism 002 with a telescopic locking function.

[0019] As mentioned above, the hollow positioning disk 3 is connected to the air pressure regulating component 001, and the air pressure regulating component 001 includes a pressure regulating positioning frame 19, a pressure regulating cylinder 20, a pressure regulating slider 21 and a pressure regulating electric cylinder 22. The pressure regulating positioning frame 19 is arranged on the hollow positioning disk 3, and the pressure regulating cylinder 20 is arranged on the pressure regulating positioning frame 19. One end of the pressure regulating cylinder 20 is connected to the hollow positioning disk 3. The pressure regulating slider 21 is sealed and slidably arranged in the pressure regulating cylinder 20. The pressure regulating electric cylinder 22 is installed on the pressure regulating positioning frame 19, and the output end of the pressure regulating electric cylinder 22 is connected to the end of the pressure regulating slider 21 away from the hollow positioning disk 3.

[0020] Specifically, the pressure-regulating positioning frame 19 can be fixedly installed at the bending part of the drag chain system. By starting the pressure-regulating electric cylinder 22, the output end of the pressure-regulating electric cylinder 22 drives the pressure-regulating slider 21 to move, so that the pressure-regulating slider 21 moves toward the hollow positioning disk 3. Through the movement of the pressure-regulating slider 21, the gas in the pressure-regulating cylinder 20 is squeezed into the hollow positioning disk 3, so that the air pressure in the hollow positioning disk 3 increases. When the output end of the pressure-regulating electric cylinder 22 drives the pressure-regulating slider 21 to move in the direction away from the hollow positioning disk 3, the air pressure in the hollow positioning disk 3 is sucked into the pressure-regulating cylinder 20.

[0021] As mentioned above, there are multiple cable core docking mechanisms 002, which correspond to the cable cores 2 one by one and are used to position and conduct the cable cores 2, and are also used to extend the cable cores 2. The cable core docking mechanisms 002 include a positioning ring 4, a telescopic positioning assembly, a positioning reset spring 5 and a conductive spring 6. The positioning ring 4 is sealed and penetrated through the hollow positioning disk 3, and multiple air inlet holes are opened between the positioning ring 4 and the hollow positioning disk 3.

[0022] It should be noted that if the bending frequency and bending angle of the drag chain system are uniform, during the actual installation process, the bending action of the drag chain system can be used to replace the crank rocker mechanism to drive the pressure regulating electric cylinder 22 to move the pressure regulating slider 21.

[0023] As mentioned above, there are two telescopic positioning assemblies, which are symmetrical and sealingly slidably arranged on both sides of the positioning ring 4, and a positioning reset spring 5 is arranged between the two telescopic positioning assemblies for resetting the telescopic positioning assemblies. A conductive spring 6 is arranged between the two telescopic positioning assemblies, and the conductive spring 6 is located in the positioning reset spring 5 for conducting electricity.

[0024] Among them, the telescopic positioning assembly includes a telescopic part with angle adjustment, a wire positioning part, a wire skin positioning part and a pneumatic positioning part. The telescopic part is sealed and slidably arranged on one side of the positioning ring 4, the wire positioning part is arranged in the telescopic part, the wire positioning part is connected to the conductive spring 6, and is used to fix the wire in the cable core 2, the wire skin positioning part is arranged in the telescopic part, and the wire skin positioning part is arranged in the telescopic part to fix the insulation layer of the cable core 2. One end of the pneumatic positioning part is connected to the hollow positioning disk 3, and the other end of the pneumatic positioning part is connected to the wire positioning part and the wire skin positioning part.

[0025] Among them, the telescopic part includes an extension sleeve 7, a steering ball 8 and a steering tube 9. The extension sleeve 7 is sealed and slidably connected to one side of the positioning ring 4. The steering ball 8 is sealed and rotatably arranged on the side of the extension sleeve 7 away from the positioning ring 4. One end of the positioning return spring 5 is connected to the end of the steering ball 8 close to the positioning ring 4. The steering tube 9 penetrates into the steering ball 8, and the wire positioning part and the wire skin positioning part are both arranged in the steering tube 9.

[0026] Among them, the wire positioning part includes a conductive plate 10, a conductive hollow positioning cylinder 11, a positioning column 12 and a wire air inlet pipe 13. The conductive plate 10 is sealed and arranged in the steering tube 9. One end of the conductive spring 6 is connected to one end of the conductive plate 10. The conductive hollow positioning cylinder 11 is arranged on the side of the conductive plate 10 away from the conductive spring 6. There are multiple positioning columns 12. The positioning columns 12 pass through and are sealed and slidably arranged in the conductive hollow positioning cylinder 11. A wire positioning cavity is formed between the multiple positioning columns 12. One end of the wire air inlet pipe 13 is sealed and connected to the conductive hollow positioning cylinder 11, and the other end of the wire air inlet pipe 13 passes through the outside of the steering tube 9.

[0027] Among them, the wire skin positioning part includes a rubber positioning tube 14 and a wire skin air intake pipe 15. The rubber positioning tube 14 is arranged on the inner wall of the steering tube 9. One end of the wire skin air intake pipe 15 is connected to the rubber positioning tube 14, and the other end of the wire skin air intake pipe 15 passes through the outside of the steering tube 9.

[0028] Among them, the pneumatic positioning part includes a telescopic positioning tube 16, a positioning elbow 17 and a one-way air intake valve 18. One end of the telescopic positioning tube 16 is connected to the hollow positioning disk 3, one end of the positioning elbow 17 is connected to the other end of the telescopic positioning tube 16, and the other end of the positioning elbow 17 is connected to the wire air intake pipe 13 and the wire skin air intake pipe 15. The one-way air intake valve 18 is installed on the positioning elbow 17.

[0029] Specifically, when the air pressure in the hollow positioning disk 3 increases, the gas will enter the positioning ring 4 through the air inlet hole. As the air pressure in the positioning ring 4 increases, under the action of pressure, the extension sleeve 7, the steering ball 8 and the steering tube 9 move in a direction away from the positioning ring 4. The movement of the steering ball 8 can stretch and deform the positioning return spring 5, and the movement of the extension sleeve 7 can indirectly increase the length of the cable core 2 to prevent excessive friction between the cable body and the drag chain system during the bending process of the drag chain system.

[0030] When the air pressure in the hollow positioning disk 3 increases, the gas will also pass through the telescopic positioning tube 16, the positioning elbow 17 and the one-way air inlet valve 18, and then enter the conductive hollow positioning cylinder 11 and the rubber positioning tube 14 through the wire air inlet pipe 13 and the wire skin air inlet pipe 15 respectively. When the air pressure in the conductive hollow positioning tube increases, under the action of pressure, the positioning column 12 will move toward one side of the wire, so that the positioning column 12 contacts the wire, and fix the position of the wire while also conducting the electricity conducted by the wire along the positioning column 12, the conductive hollow positioning tube and the conductive plate 10 to one side of the conductive spring 6. When the air pressure in the rubber positioning tube 14 increases, the rubber positioning tube 14 itself expands and deforms to contact the insulating layer on the surface of the cable core 2, and fixes the position of the cable core 2 while effectively preventing contact between external gas and the wire, thereby preventing oxidation of the wire.

[0031] Furthermore, after the cable body is installed in the corresponding steering tube 9, as the drag chain system bends, driven by the cable core 2, the steering ball 8 and the steering tube 9 can be rotated at any angle on one side of the extension sleeve 7, so that the cable body can move arbitrarily with the drag chain system. The output end of the pressure-regulating electric cylinder 22 drives the pressure-regulating slider 21 to adjust the air pressure in the hollow positioning disk 3, and under the extension of the positioning reset spring 5 and the conductive spring 6, the length of the cable core 2 at the bending part of the drag chain system can be adjusted through the contraction and deformation of the telescopic positioning tube 16. When installing the cable body, the cable body can be directly fixed in the non-bending part of the drag chain system, and the wire core docking mechanism is only set at the bending part of the drag chain system, which can effectively prevent the friction between the cable body and the drag chain system.

[0032] It should be supplemented that, by providing a one-way air inlet valve 18, the discharge of gas in the conductive hollow positioning tube 11 and the rubber positioning tube 14 can be effectively prevented, so that the rubber positioning tube 14 and the positioning column 12 can firmly fix the cable core 2 in the steering tube 9. For the installation of the voltage regulating positioning frame 19, it can be installed on the outside of the drag chain system according to actual conditions. Since the position of the cable core 2 can be extended and fixed through the cooperation of the wire core docking mechanism, the friction between the cable body and the drag chain system can be effectively avoided without affecting the bending of the drag chain system.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable with bending durability, comprising a cable body, wherein the cable body comprises an insulating sheath (1) and a plurality of cable cores (2), characterized in that: Also includes: A hollow positioning disk (3), wherein the hollow positioning disk (3) is connected to an air pressure regulating component (001); A cable core docking mechanism (002) with a telescopic locking function, wherein a plurality of the cable core docking mechanisms (002) are provided, and the cable core docking mechanisms (002) correspond one to one with the cable cores (2), and are used to position the cable cores (2) for conduction, and are also used to extend the cable cores (2); Wherein, the cable core docking mechanism (002) comprises: A positioning ring (4), the positioning ring (4) being sealed and penetratingly arranged on the hollow positioning disk (3), and a plurality of air intake holes being provided between the positioning ring (4) and the hollow positioning disk (3); A telescopic positioning assembly, wherein two telescopic positioning assemblies are provided, and the two telescopic positioning assemblies are symmetrical and sealingly slidably arranged on both sides of the positioning ring (4); A positioning reset spring (5), the positioning reset spring (5) being arranged between the two telescopic positioning assemblies and used for resetting the telescopic positioning assemblies; A conductive spring (6), the conductive spring (6) being arranged between the two telescopic positioning components, the conductive spring (6) being located inside the positioning reset spring (5) and being used for conducting electricity.

2. A cable with bending durability according to claim 1, characterized in that: The telescopic positioning assembly comprises: A telescopic portion having an angle-adjustable configuration, the telescopic portion being sealed and slidably disposed on one side of the positioning ring (4); A conductor positioning portion, the conductor positioning portion being arranged in the telescopic portion, the conductor positioning portion being connected to the conductive spring (6) and being used to fix the conductor in the cable core (2); A wire sheath positioning portion, the wire sheath positioning portion being arranged in the telescopic portion, the wire sheath positioning portion being arranged in the telescopic portion and being used to fix the insulation layer of the cable core (2); A pneumatic positioning part, one end of which is connected to the hollow positioning disk (3), and the other end of which is connected to the wire positioning part and the wire skin positioning part.

3. A cable with bending durability according to claim 2, characterized in that: The telescopic portion comprises: An extension sleeve (7), the extension sleeve (7) being sealed and slidably connected to one side of the positioning ring (4); a steering ball (8), the steering ball (8) being sealed and rotatably arranged on a side of the extension sleeve (7) away from the positioning ring (4), one end of the positioning return spring (5) being connected to an end of the steering ball (8) close to the positioning ring (4); A steering tube (9), the steering tube (9) penetrates into the steering ball (8), and the wire positioning portion and the wire skin positioning portion are both arranged in the steering tube (9).

4. A cable with bending durability according to claim 3, characterized in that: The wire positioning portion comprises: a conductive plate (10), the conductive plate (10) being sealed and disposed in the steering tube (9), one end of the conductive spring (6) being connected to one end of the conductive plate (10); A conductive hollow positioning cylinder (11), the conductive hollow positioning cylinder (11) being arranged on a side of the conductive plate (10) away from the conductive spring (6); A positioning column (12), wherein a plurality of the positioning columns (12) are provided, the positioning columns (12) penetrate through and are sealingly slidably disposed in the conductive hollow positioning cylinder (11), and a wire positioning cavity is formed between the plurality of the positioning columns (12); A wire air intake pipe (13), one end of which is sealed and connected to the conductive hollow positioning tube (11), and the other end of which penetrates to the outside of the steering tube (9).

5. A cable with bending durability according to claim 4, characterized in that: The wire skin positioning part comprises: A rubber positioning tube (14), wherein the rubber positioning tube (14) is arranged on the inner wall of the steering tube (9); A wire-skin air intake pipe (15), one end of which is connected to the rubber positioning pipe (14), and the other end of which passes through the outside of the steering pipe (9).

6. A cable with bending durability according to claim 5, characterized in that: The pneumatic positioning unit comprises: A telescopic positioning tube (16), one end of the telescopic positioning tube (16) being connected to the hollow positioning plate (3); A positioning elbow (17), one end of the positioning elbow (17) being connected to the other end of the telescopic positioning tube (16), and the other end of the positioning elbow (17) being connected to the wire air inlet pipe (13) and the wire skin air inlet pipe (15); A one-way air intake valve (18), wherein the one-way air intake valve (18) is mounted on the positioning elbow (17).

7. The cable with bending durability according to claim 6, characterized in that: The air pressure regulating assembly (001) comprises: A pressure regulating positioning frame (19), wherein the pressure regulating positioning frame (19) is arranged on the hollow positioning plate (3); A pressure regulating cylinder (20), the pressure regulating cylinder (20) being arranged on the pressure regulating positioning frame (19), and one end of the pressure regulating cylinder (20) being in communication with the hollow positioning disk (3); A pressure regulating slider (21), the pressure regulating slider (21) being sealed and slidably disposed in the pressure regulating cylinder (20); A pressure regulating electric cylinder (22), the pressure regulating electric cylinder (22) being mounted on the pressure regulating positioning frame (19), the output end of the pressure regulating electric cylinder (22) being connected to an end of the pressure regulating sliding block (21) away from the hollow positioning plate (3).

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