A welding gun cable bundle torsion buffering protection device and welding robot

Abstract

This invention relates to the field of welding technology, specifically to a welding torch cable bundle torsion buffer protection device and a welding robot. The buffer protection device includes a bendable and automatically reset buffer sleeve fitted onto the cable bundle and a buffer device installed inside the wire feeding mechanism. A wire reel is mounted on the base of the welding robot. After passing through the wire feeding mechanism, the cable bundle is connected to the wire reel via a rotating mounting part. A moving magnetic ring is mounted on the buffer sleeve, and the magnetic buffer device includes a fixed magnetic ring coaxially arranged with the cable bundle. This invention can buffer the axial tension, radial bending, and circumferential torsion forces generated by the multi-axis linkage of the welding torch, and can dynamically adjust the buffer parameters according to the working conditions, significantly improving the continuous and stable operation capability of the welding robot and reducing the overall operating cost.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding torch cable bundle torsion buffer protection device and a welding robot. Background Technology

[0002] This invention is applied to the protection of welding torch cable bundles in welding robots. When the robot performs welding tasks with complex trajectories, especially in situations requiring large-scale attitude adjustments, the welding torch will undergo multi-directional composite motion. Since the tail of the cable bundle is fixed to the robot body through a rigid interface and wire feeding mechanism, this contradictory structure of free movement at the front end and fixed tail end forces the welding torch cable bundle to bear continuous mechanical stress during movement.

[0003] Chinese Patent Publication No. CN120362666A discloses a welding torch cable bundle torsion buffer protection device and a welding robot. The welding torch cable bundle torsion buffer protection device includes a welding torch mechanism, a wire feeding mechanism, and a cable bundle buffer mechanism. The welding torch mechanism includes a welding torch and a welding torch cable bundle. The welding torch is mounted on a clamping joint axis on the robot body. The welding torch cable bundle is disposed within the robotic arm of the robot body. The front part of the welding torch cable bundle is connected to the welding torch, and its tail extends along the robotic arm to the outside of the robotic arm and connects to the wire feeding mechanism. The cable bundle buffer mechanism includes a displacement buffer member that is movable or deformable relative to the robot body. The displacement buffer member is connected to the tail of the welding torch cable bundle or the wire feeding mechanism. When the welding torch cable bundle moves with the welding torch, the displacement buffer member moves or deforms relative to the robot body in a resettable manner, providing an axial buffer spacing for the welding torch cable bundle in the extension direction of the welding torch cable bundle.

[0004] The aforementioned patent documents exhibit the following problems: First, the buffer structure primarily relies on mechanical contact, which suffers from severe friction and wear. Over time, this leads to decreased buffering accuracy and sluggish response, making it unsuitable for handling the dynamic forces generated by the multi-axis linkage of the welding torch. Second, the use of a ball head and liquid conductive medium (mercury) for rotational conductivity poses a safety hazard due to toxic leakage and fails to meet the synchronous transmission requirements of multiple conductive wires and signal control lines within the cable bundle. Prolonged use can result in conductive failures due to leakage. Third, the cable bundle protection lacks a structure that balances flexibility and support. Rigid sleeves restrict the robot arm's movement flexibility, while simple elastic sleeves provide insufficient support and are prone to excessive deformation during radial torsion, leading to cracking of the cable bundle insulation and fatigue of the internal copper core. Fourth, the fixed and non-adjustable buffering force cannot dynamically adapt to changes in welding torch speed and load, potentially resulting in insufficient or excessive buffering under extreme conditions. These problems collectively lead to a short lifespan for the welding torch cable bundle, high maintenance costs, and safety hazards, severely impacting the continuous and stable operation of the welding robot. Summary of the Invention

[0005] Therefore, it is necessary to provide a welding torch cable harness torsion buffer protection device and a welding robot to address the existing technical problems.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows: This invention provides a welding torch cable bundle torsion buffer protection device, which is installed on a welding robot. The welding robot is equipped with a wire feeding mechanism. The cable bundle is set in the robotic arm of the welding robot and connected to the welding torch. The other end of the cable bundle extends along the robotic arm and passes through the wire feeding mechanism. The buffer protection device includes a bendable and automatically reset buffer sleeve fitted on the cable bundle and a magnetic buffer device installed inside the wire feeding mechanism. A wire reel is installed on the base of the welding robot. After the cable bundle passes through the wire feeding mechanism, it is connected to the wire reel through a rotating mounting part. A moving magnetic ring is installed on the buffer sleeve. The magnetic buffer device includes a fixed magnetic ring arranged coaxially with the cable bundle.

[0007] Preferably, there are two sets of magnetic buffer devices, both installed in the wire feeding mechanism, with the two sets of magnetic buffer devices located at both ends of the wire feeding mechanism along the axis of the cable bundle.

[0008] Preferably, the magnetic buffer device further includes an electromagnet and a mounting frame. The mounting frame is fixedly installed in the wire feeding mechanism, and both the fixed magnetic ring and the electromagnet are arranged in the mounting frame, with the fixed magnetic ring located inside the electromagnet.

[0009] Preferably, the buffer sleeve includes an inner tube and an outer tube arranged coaxially, with a metal buffer skeleton filling the space between the inner tube and the outer tube, and both the inner tube and the outer tube are provided with radially bendable bends.

[0010] Preferably, a plurality of metal buffer frames are arranged in a ring around the axis of the inner tube. The metal buffer frame is composed of a metal support ring and a metal arc ring. The metal arc ring is located outside the bending part and its two ends are fixedly connected to the metal support ring.

[0011] Preferably, the metal support ring is composed of an arc plate that fits against the inner tube wall and elastic support plates that extend radially outward from both ends of the arc plate, with the top of the elastic support plate fitting against the inner wall of the outer tube.

[0012] Preferably, a number of mounting rings are arranged sequentially along the axial direction of the outer tube, and the moving magnetic ring is arranged on the mounting ring.

[0013] Preferably, the rotating mounting part comprises a conductive ring, a right-angle conductive seat, a brush, and a brush holder. The conductive ring is installed at the end of the cable bundle, the right-angle conductive seat is located beside the end of the cable bundle, the brush holder is fixedly installed on the right-angle conductive seat, and the brush is disposed on the brush holder. The brush is electrically connected to the cable bundle through the conductive ring.

[0014] Preferably, a sliding frame is also installed on the right-angle conductive base. The sliding frame is fixedly connected to the right-angle conductive base. A limit guide post is fixedly installed on the outer wall of the wire feeding mechanism along the extension direction of the cable bundle. A linear magnetic strip is fixedly provided on the outer wall of the limit guide post. Both ends of the sliding frame are provided with central holes for the limit guide post to pass through. A permanent magnet is installed in the central hole.

[0015] A welding robot is also provided, on which a welding torch cable bundle torsion buffer protection device is installed.

[0016] The advantages of this invention compared to the prior art are: 1. By using magnetic coupling between a moving magnetic ring and a fixed magnetic ring, the traditional mechanical contact buffer is replaced, completely eliminating friction and wear. An electromagnet is added to dynamically adjust the buffering force, adapting to different loads and motion conditions. The fixed magnetic ring continues to support the cable bundle even when the electromagnet is de-energized, ensuring uninterrupted contactless sliding function, effectively extending the service life of the cable bundle and buffer components, and reducing maintenance frequency. This invention can buffer the axial tension, radial bending, and circumferential torsional forces generated by the multi-axis linkage of the welding torch, and can dynamically adjust the buffering parameters according to working conditions, significantly improving the continuous and stable operation capability of the welding robot and reducing overall operating costs.

[0017] 2. The buffer sleeve adopts a composite structure of inner tube, outer tube and memory metal buffer skeleton. The bending part allows radial bending to adapt to the movement of the robotic arm. The metal support ring and elastic support plate work together to absorb radial impact force, which not only avoids the restriction of movement by rigid sleeve, but also solves the problem of insufficient support of simple elastic sleeve. It can effectively protect the insulation layer of cable bundle and internal wires, and reduce fatigue damage caused by torsion and bending.

[0018] 3. The rotating mounting section enables stable electrical connection during 360° rotation, replacing toxic liquid conductive media and eliminating leakage risks; it can simultaneously transmit current and multiple control signals, adapting to the complex rotational motion of the welding torch, significantly reducing the probability of conductive failures and improving operational safety and reliability.

[0019] 4. The sliding frame and the limiting guide post achieve contactless guidance through the magnetic coupling of permanent magnets and linear magnetic strips, which limits the radial deviation of the cable bundle, avoids mechanical contact wear, reduces guiding resistance, ensures smooth axial movement of the cable bundle, and further reduces the risk of collision damage caused by deviation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a welding robot; Figure 2 This is a front view of a welding robot; Figure 3 This is a three-dimensional structural diagram of a welding torch cable bundle torsion buffer protection device; Figure 4 This is a partial three-dimensional structural diagram of a welding torch cable bundle torsion buffer protection device; Figure 5 This is a side view of the buffer protection device in a welding torch cable bundle torsion buffer protection device; Figure 6 This is a three-dimensional sectional view of the buffer protection device in a welding torch cable bundle torsion buffer protection device; Figure 7 This is a schematic diagram of the three-dimensional structure of the buffer sleeve in a welding torch cable harness torsion buffer protection device. Figure 1 ; Figure 8 This is a schematic diagram of the three-dimensional structure of the buffer sleeve in a welding torch cable harness torsion buffer protection device. Figure 2 ; Figure 9 This is a three-dimensional sectional view of the buffer sleeve in a welding torch cable harness torsion buffer protection device; Figure 10 This is a three-dimensional structural diagram of the cable bundle and rotating mounting part in a welding torch cable bundle torsion buffer protection device; Figure 11 This is a three-dimensional structural diagram of the rotating mounting part in a welding torch cable bundle torsion buffer protection device.

[0021] The numbers on the map are: 1. Welding robot; 2. Wire feeding mechanism; 3. Cable bundle; 4. Buffer protection device; 5. Buffer sleeve; 6. Magnetic buffer device; 7. Base; 8. Wire reel; 9. Rotary mounting part; 10. Moving magnetic ring; 11. Fixed magnetic ring; 12. Electromagnet; 13. Mounting bracket; 14. Inner tube; 15. Outer tube; 16. Metal buffer skeleton; 17. Bending part; 18. Metal support ring; 19. Metal arc ring; 20. Arc plate; 21. Elastic support plate; 22. Mounting ring; 23. Conductive ring; 24. Right-angle conductive seat; 25. Brush; 26. Brush holder; 27. Sliding frame; 28. Limiting guide post; 29. ​​Linear magnetic strip; 31. Center hole; 32. Permanent magnet. Detailed Implementation

[0022] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-11The diagram shows a welding torch cable bundle torsion buffer protection device, which is installed on a welding robot 1. The welding robot 1 is equipped with a wire feeding mechanism 2. The cable bundle 3 is set in the robotic arm of the welding robot 1 and connected to the welding torch. The other end of the cable bundle 3 extends along the robotic arm and passes through the wire feeding mechanism 2. The buffer protection device 4 includes a buffer sleeve 5 that is sleeved on the cable bundle 3 and can be bent and automatically reset, and a magnetic buffer device 6 installed inside the wire feeding mechanism 2. A wire reel 8 is installed on the base 7 of the welding robot 1. After the cable bundle 3 passes through the wire feeding mechanism 2, it is connected to the wire reel 8 through a rotating mounting part 9. A moving magnetic ring 10 is installed on the buffer sleeve 5. The magnetic buffer device 6 includes a fixed magnetic ring 11 that is coaxially arranged with the cable bundle 3.

[0024] When the welding torch cable bundle 3 of the welding robot 1 moves with the robotic arm, it often suffers wear or breakage due to forces such as torsion and axial tension. Existing technologies mostly employ mechanical contact buffer structures, such as guide rails, sliders, and elastic components, which suffer from severe friction and wear, and delayed buffer response. Furthermore, the cable protection lacks a flexible and automatically resettable structure, making it difficult to adapt to complex torsional conditions. This invention replaces mechanical contact buffering with magnetic levitation buffering and adds a flexible and resettable buffer sleeve 5. The buffer sleeve 5, fitted onto the cable bundle 3, is flexible and automatically resets, protecting the cable bundle 3 from excessive bending during torsion. The magnetic buffer device 6 within the wire feeding mechanism 2 includes a fixed magnetic ring 11 coaxial with the cable bundle 3. The magnetic coupling between the moving magnetic ring 10 and the fixed magnetic ring 11 achieves a contactless axial buffering function, reducing mechanical wear. The moving magnetic ring 10 on the buffer sleeve 5 cooperates with the fixed magnetic ring 11. Simultaneously, the cable bundle 3 is connected to the cable reel 8 via a rotating mounting part 9, which adapts to the rotational movement of the cable bundle 3. It significantly reduces damage to cable harness 3 caused by friction and rigid stress, extends service life, improves buffer response speed, and adapts to more complex motion conditions.

[0025] Two sets of magnetic buffer devices 6 are provided and are installed in the wire feeding mechanism 2. The two sets of magnetic buffer devices 6 are located at both ends of the wire feeding mechanism 2 along the axis of the cable bundle 3.

[0026] When buffering the cable bundle 3, local stress concentration along the axis is easily caused. By designing two sets of magnetic buffering devices 6 at the ends of the wire feeding mechanism 2, the axial buffering balance is enhanced. The two sets of magnetic buffering devices 6 work together to buffer the axial impact force when the cable bundle 3 enters and exits the wire feeding mechanism 2, avoiding uneven force at both ends when using a single buffer. This makes the force on the cable bundle 3 more uniform within the wire feeding mechanism 2, reducing local excessive stretching or compression, and further reducing the risk of fatigue damage to the cable bundle 3.

[0027] The magnetic buffer device 6 also includes an electromagnet 12 and a mounting bracket 13. The mounting bracket 13 is fixedly installed in the wire feeding mechanism 2. The fixed magnetic ring 11 and the electromagnet 12 are both arranged in the mounting bracket 13, with the fixed magnetic ring 11 located inside the electromagnet 12.

[0028] The adjustable magnetic buffering force is achieved by adding an electromagnet 12. The mounting bracket 13 ensures the relative position stability of the fixed magnetic ring 11 and the electromagnet 12. The electromagnet 12 can adjust the magnetic force by changing the current, thereby changing the magnetic repulsion or attraction between it and the moving magnetic ring 10, and realizing dynamic adjustment of the buffering force. The buffering device can adapt to different loads and operating conditions, improving the adaptability of the buffer. The fixed magnetic ring 11 is used to ensure that when the electromagnet 12 is de-energized, it can still cooperate with the moving magnetic ring 10 to support the cable, ensuring that the cable bundle 3 can achieve contactless sliding during axial displacement.

[0029] The buffer sleeve 5 includes an inner tube 14 and an outer tube 15 arranged coaxially. A metal buffer skeleton 16 is filled between the inner tube 14 and the outer tube 15. Both the inner tube 14 and the outer tube 15 are provided with radially bendable bending portions 17.

[0030] In existing technologies, when radially buffering the cable bundle 3, rigid or elastic sleeves are typically used. Rigid sleeves cannot adapt to radial bending, which can affect the welding action of the welding robot 1. Simple elastic sleeves lack sufficient support and are prone to excessive deformation, causing the cable bundle 3 to still be subjected to significant stress during radial torsion. The buffer collar provides a sleeve structure that combines flexibility, support, and automatic reset capability. It is designed with coaxial inner tube 14 and outer tube 15, with a metal buffer skeleton 16 filling between them. Both the inner tube 14 and outer tube 15 have radially bendable bends 17. The bends 17 allow the sleeve to bend under radial force, and the metal buffer skeleton 16 provides support and drives the sleeve to automatically reset after the force is removed. The inner tube 14 directly protects the cable bundle 3, while the outer tube 15 enhances the overall structural strength. Furthermore, the outer tube 15 provides good radial buffer support when the cable bundle 3 collides with the welding robot 1 or the buffer device due to vibration, excessive movement, or sudden stops, thus preventing damage to the cable bundle 3. The buffer sleeve 5 can accommodate the radial torsional movement of the cable bundle 3, and can also reduce the bending degree of the cable bundle 3 through the support and restoring force of the skeleton, effectively protecting the insulation layer and internal wires of the cable bundle 3. It is worth mentioning that the metal buffer skeleton 16 is made of shape memory metal.

[0031] Several metal buffer frames 16 are arranged in a ring around the axis of the inner tube 14. The metal buffer frame 16 is composed of a metal support ring 18 and a metal arc ring 19. The metal arc ring 19 is located outside the bending part 17 and its two ends are fixedly connected to the metal support ring 18.

[0032] The annularly distributed skeleton ensures balanced radial force distribution. The metal arc ring 19 deforms as the sleeve bends outside the bend 17, absorbing radial force. The metal support ring 18 fixes the arc ring and transmits force. This design prevents excessive local stress on the skeleton, improves the durability of the buffer sleeve 5, and enhances the radial buffering effect. It also prevents localized stress concentration during bending, which could lead to skeleton deformation or breakage.

[0033] The metal support ring 18 is composed of an arc plate 20 that is in contact with the wall of the inner tube 14 and elastic support plates 21 that extend radially outward from both ends of the arc plate 20. The top end of the elastic support plate 21 is in contact with the inner wall of the outer tube 15.

[0034] The arc plate 20 is fixed to the inner tube 14. The elastic support plate 21 transmits the radial force from the outer tube 15 to the inner tube 14, while its own deformation absorbs part of the radial force, achieving elastic buffering between the inner tube 14 and the outer tube 15. The beneficial effect is to reduce the rigid impact between the inner tube 14 and the outer tube 15. The deformation of the elastic support plate 21 further enhances the radial buffering capacity, protecting the cable bundle 3 inside the inner tube 14. Because the elastic support plate 21 is made of shape memory metal, it can quickly reset after buffering radial impact, thus achieving the rapid bending and reset function of the cable bundle 3.

[0035] Several mounting rings 22 are arranged sequentially along the axial direction of the outer tube 15, and the moving magnetic ring 10 is arranged on the mounting ring 22.

[0036] The mounting ring 22 is set on the outer tube 15. Several moving magnetic rings 10 can be set on the outer tube 15 through the mounting ring 22. When the cable bundle 3 moves, the moving magnetic rings 10 sleeved on it move synchronously with the cable bundle 3, so that when the cable bundle 3 passes through the fixed magnetic ring 11, there is always a moving magnetic ring 10 and a fixed magnetic ring 11 working together to buffer the cable bundle 3.

[0037] The rotating mounting part 9 comprises a conductive ring 23, a right-angle conductive seat 24, a brush 25, and a brush holder 26. The conductive ring 23 is installed at the end of the cable bundle 3, the right-angle conductive seat 24 is located beside the end of the cable bundle 3, the brush holder 26 is fixedly installed on the right-angle conductive seat 24, and the brush 25 is disposed on the brush holder 26. The brush 25 is electrically connected to the cable bundle 3 through the conductive ring 23.

[0038] To address the cable bundle torsion buffering problem, existing technologies employ ball heads and conductive liquid filling. However, the cable bundle 3 contains multiple conductive and signal control lines, making this method unsuitable for multi-signal transmission. Furthermore, the conductive liquid is prone to leakage over prolonged use, causing wear on the ball head and disrupting power transmission, thus hindering stable and long-term operation. In this invention, the conductive ring 23 rotates with the cable bundle 3, and the brush 25 remains in contact with the conductive ring 23, achieving stable electrical connection during 360° rotation. The right-angle conductive base 24 adapts to the extension direction of the cable bundle 3. The contact method between the brush 25 and the conductive ring 23 accommodates multi-directional rotation, ensuring stable transmission of electrical signals and current and reducing the risk of conductive failures. The rotating mounting part 9 allows the tail of the welding torch cable bundle 3 to completely follow the rotation of the welding torch, achieving axial and circumferential following motion of the cable bundle 3. This eliminates the need for the cable bundle 3 to withstand any torsion, and combined with the radial buffering function of the buffer sleeve 5, significantly extends its service life.

[0039] A sliding frame 27 is also installed on the right-angle conductive base 24. The sliding frame 27 is fixedly connected to the right-angle conductive base 24. A limiting guide post 28 is fixedly installed on the outer wall of the wire feeding mechanism 2 along the extension direction of the cable bundle 3. A linear magnetic strip 29 is fixedly provided on the outer wall of the limiting guide post 28. The two ends of the sliding frame 27 are provided with a central hole 31 for the limiting guide post 28 to pass through. A permanent magnet 32 ​​is installed in the central hole 31.

[0040] The sliding frame 27 on the right-angle conductive base 24 cooperates with the limiting guide post 28 on the outside of the wire feeding mechanism 2. The guide post has a linear magnetic strip 29. A permanent magnet 32 ​​is installed in the center hole 31 of the sliding frame 27. The linear magnetic strip 29 provides linear support and guidance for the sliding frame 27, realizing non-contact stable guidance of axial movement. The magnetic repulsion or attraction between the permanent magnet 32 ​​and the linear magnetic strip 29 causes the sliding frame 27 to slide along the guide post without contact, limiting the radial offset of the sliding frame 27, realizing precise guidance of axial movement, avoiding wear caused by mechanical contact, reducing resistance during the guidance process, ensuring the smoothness of the axial movement of the cable bundle 3, and further improving the reliability and life of the overall device.

[0041] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A welding torch cable bundle torsion buffer protection device, installed on a welding robot (1), the welding robot (1) being provided with a wire feeding mechanism (2), a cable bundle (3) being disposed in the robotic arm of the welding robot (1) and connected to the welding torch, the other end of the cable bundle (3) extending along the robotic arm and passing through the wire feeding mechanism (2), characterized in that, The buffer protection device (4) includes a buffer sleeve (5) that is flexible and automatically reset when sleeved on the cable bundle (3) and a magnetic buffer device (6) installed inside the wire feeding mechanism (2). A wire reel (8) is installed on the base (7) of the welding robot (1). After the cable bundle (3) passes through the wire feeding mechanism (2), it is connected to the wire reel (8) through the rotating mounting part (9). A moving magnetic ring (10) is installed on the buffer sleeve (5). The magnetic buffer device (6) includes a fixed magnetic ring (11) that is coaxially arranged with the cable bundle (3). The magnetic buffer device (6) also includes an electromagnet (12) and a mounting bracket (13). The mounting bracket (13) is fixedly installed in the wire feeding mechanism (2). The fixed magnetic ring (11) and the electromagnet (12) are both set in the mounting bracket (13). The fixed magnetic ring (11) is located inside the electromagnet (12). The buffer sleeve (5) includes an inner tube (14) and an outer tube (15) arranged coaxially; Several mounting rings (22) are arranged sequentially along the axial direction of the outer tube (15), and the moving magnetic ring (10) is arranged on the mounting ring (22); The magnetic coupling between the moving magnetic ring (10) and the fixed magnetic ring (11) achieves a non-contact axial buffering function, reducing mechanical wear. When the cable bundle (3) moves, the moving magnetic ring (10) sleeved on it moves synchronously with the cable bundle (3), so that when the cable bundle (3) passes through the fixed magnetic ring (11), the moving magnetic ring (10) and the fixed magnetic ring (11) always cooperate to buffer the cable bundle (3). The electromagnet (12) can adjust the magnitude of the magnetic force by adjusting the current, thereby changing the magnetic repulsion or attraction between it and the moving magnetic ring (10) to achieve dynamic adjustment of the buffering force; the buffering device can adapt to different loads and motion conditions, improving the adaptability of the buffering; the fixed magnetic ring (11) is used to ensure that when the electromagnet (12) is de-energized, it can still cooperate with the moving magnetic ring (10) to lift the cable, ensuring that the cable bundle (3) can achieve contactless sliding when it is axially displaced.

2. The welding torch cable bundle torsion buffer protection device according to claim 1, characterized in that, The magnetic buffer device (6) has two sets, both of which are installed in the wire feeding mechanism (2). The two sets of magnetic buffer devices (6) are located at both ends of the wire feeding mechanism (2) along the axis of the cable bundle (3).

3. The welding torch cable harness torsion buffer protection device according to claim 1, characterized in that, A metal buffer skeleton (16) is filled between the inner tube (14) and the outer tube (15), and both the inner tube (14) and the outer tube (15) are provided with radially bendable bending parts (17).

4. The welding torch cable bundle torsion buffer protection device according to claim 3, characterized in that, Several metal buffer skeletons (16) are arranged in a ring around the axis of the inner tube (14). The metal buffer skeleton (16) is composed of a metal support ring (18) and a metal arc ring (19). The metal arc ring (19) is located outside the bending part (17) and its two ends are fixedly connected to the metal support ring (18).

5. A welding torch cable bundle torsion buffer protection device according to claim 4, characterized in that, The metal support ring (18) is composed of an arc plate (20) that fits against the wall of the inner tube (14) and elastic support plates (21) that extend radially outward from both ends of the arc plate (20). The top of the elastic support plate (21) fits against the inner wall of the outer tube (15).

6. The welding torch cable bundle torsion buffer protection device according to claim 1, characterized in that, The rotating mounting part (9) consists of a conductive ring (23), a right-angle conductive seat (24), a brush (25) and a brush holder (26). The conductive ring (23) is installed at the end of the cable bundle (3), the right-angle conductive seat (24) is located on the side of the end of the cable bundle (3), the brush holder (26) is fixedly installed on the right-angle conductive seat (24), and the brush (25) is set on the brush holder (26). The brush (25) is electrically connected to the cable bundle (3) through the conductive ring (23).

7. The welding torch cable bundle torsion buffer protection device according to claim 6, characterized in that, A sliding frame (27) is also installed on the right-angle conductive base (24). The sliding frame (27) is fixedly connected to the right-angle conductive base (24). A limit guide post (28) is fixedly installed on the outer wall of the wire feeding mechanism (2) along the extension direction of the cable bundle (3). A linear magnetic strip (29) is fixedly provided on the outer wall of the limit guide post (28). The two ends of the sliding frame (27) are provided with a central hole (31) through which the limit guide post (28) passes. A permanent magnet (32) is installed in the central hole (31).

8. A welding robot, characterized in that, It is equipped with a welding torch cable bundle torsion buffer protection device as described in any one of claims 1-7.

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