An automatic welding equipment for sheet metal parts

Abstract

The present application belongs to the technical field of welding equipment, in particular to a sheet metal automatic welding equipment, which comprises a multi-axis mechanical arm and a welding gun, the welding gun is installed at the end of the multi-axis mechanical arm, and the welding gun is used for welding the sheet metal; further comprising a range cleaning assembly, the range cleaning assembly is installed on the multi-axis mechanical arm, and the range cleaning assembly performs range cleaning on the sheet metal with the welding gun as the center; the range cleaning assembly of the present application rotates in the circumferential direction with the welding gun as the center, so that the position of the welding gun is always in the center of the cleaning range, and when the movement path of the welding gun changes or the welding angle of the welding gun changes, the welding path is always located in the cleaning range; at the same time, since the laser head in the present application rotates periodically around the welding gun, when the laser head cleans the sheet metal, it not only performs laser cleaning on the area to be welded, but also performs laser cleaning on the already welded area.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, specifically an automatic welding equipment for sheet metal parts. Background Technology

[0002] Sheet metal parts are widely used in modern industrial production. They play an important role not only in automobile manufacturing, aerospace, and electronic equipment, but are also ubiquitous in daily life. Sheet metal parts come in many varieties, including various metal sheets, pipes, and profiles, and are processed through stamping, shearing, bending, welding, and other techniques.

[0003] Welding is one of the most common processes in sheet metal manufacturing. In the production of large sheet metal parts, due to the diverse welding paths and angles, automated welding equipment consisting of multi-axis robotic arms or robots carrying welding components, combined with precise control and optimized algorithms, can effectively improve the welding process and reduce the labor intensity of workers, providing strong support for the automated production of sheet metal parts. In automated welding processes, the surface cleaning of the sheet metal parts to be welded has a significant impact on the welding effect. Therefore, chemical cleaning and physical cleaning are usually performed before welding to remove oil, dust, impurities, etc. from the surface of the sheet metal parts. However, in the welding process of large sheet metal parts, due to the limited welding area, cleaning the entire sheet metal part is not only time-consuming and labor-intensive, but also affects the overall processing efficiency of the sheet metal parts.

[0004] To address this problem, a laser cleaning and welding carriage and its control method have been disclosed in the related technology (application number CN2020106835503). The carriage includes a body with a crossbeam. A welding assembly and a laser assembly are mounted on the crossbeam, and a control panel is also mounted on the crossbeam. The control panel contains a control system. Both the welding assembly and the laser assembly are electrically connected to the control system. The laser assembly is rotatably mounted on the crossbeam. Before welding, the laser assembly rotates to perform laser pre-cleaning of the area to be welded. However, during actual welding, due to the diversity of welding paths and the variability of welding angles, the welding path and the cleaning path become misaligned when switching welding path directions or adjusting angles, thus affecting the welding effect.

[0005] In view of this, the present invention proposes an automatic welding equipment for sheet metal parts to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the above-mentioned technical problems, this invention proposes an automatic welding equipment for sheet metal parts.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the automatic welding equipment for sheet metal parts according to the present invention includes a multi-axis robotic arm and a welding torch, wherein the welding torch is installed at the end of the multi-axis robotic arm and the welding torch is used to weld sheet metal parts;

[0008] It also includes a range cleaning component, which is mounted on a multi-axis robotic arm and performs range cleaning on the sheet metal parts with the welding torch as the center.

[0009] The range cleaning assembly includes a mounting rod, a laser head, and a drive mechanism;

[0010] The mounting rods are all rotatably mounted at the end of the multi-axis robotic arm, and the mounting rods are coaxially designed with the welding gun.

[0011] A drive mechanism is fixedly installed at the end of the multi-axis robotic arm, and the drive mechanism is used to drive the mounting rod to rotate circumferentially.

[0012] The laser head is fixedly mounted on the mounting rod. The laser head has multiple emission ports, each containing a laser emission system. The angles of the multiple emission ports are all different.

[0013] Preferably, the drive mechanism includes a drive motor, a reciprocating lead screw, a nut, a rack and pinion, and a rotating wheel;

[0014] A mounting plate is fixedly installed on the multi-axis robotic arm, and a drive motor is fixedly installed on the mounting plate.

[0015] A reciprocating lead screw is fixedly installed at the output end of the drive motor, and a nut is installed on the reciprocating lead screw. The reciprocating lead screw and the nut form a helical transmission pair.

[0016] A rack is fixedly installed on one side of the nut, and the rotating wheel is rotatably installed at the end of the multi-axis robotic arm. The rotating wheel is connected to the mounting rod and meshes with the rack.

[0017] Preferably, the rotating wheel rotates at an angle greater than 10 degrees in a single rotation.

[0018] Preferably, the mounting rods are designed in multiple ways, with laser heads mounted on each of the multiple mounting rods. The length of the laser head matches the length of the mounting rod. The lengths of the multiple mounting rods are not the same, and the length of the mounting rod decreases gradually as the distance between the mounting rod and the sheet metal part decreases.

[0019] Preferably, a connecting ring is fixedly installed on the rotating wheel, and multiple annular grooves are formed on the connecting ring. A slider is slidably installed in each annular groove. The mounting rod is installed on the slider. A limit spring is fixedly installed on the connecting ring. The limit spring is fixedly connected to the slider and is used to limit the slider.

[0020] Preferably, the connecting ring has mounting grooves on both the upper and lower sides of the ring groove, a guide tube is rotatably installed at the end of the mounting groove, and the limiting spring is fixedly installed in the mounting groove.

[0021] Preferably, the inner wall of the annular groove is provided with a meshing groove, which is an arc-shaped groove. An electrode plate is elastically installed in the meshing groove by a spring. A power supply cable is connected to the electrode plate. A connecting piece is installed on the end of the slider facing the meshing groove. The connecting piece is electrically connected to the laser head. In the initial state, the slider extends into the meshing groove, and the connecting piece is electrically connected to the electrode plate.

[0022] Preferably, the mounting rod and the slider are both hinged, and each slider is hinged with an electric telescopic rod, the end of the electric telescopic rod away from the slider being hinged to the mounting rod.

[0023] Preferably, the slider has symmetrically designed telescopic grooves, the connecting piece is located between the telescopic grooves, and a push rod is slidably installed in the telescopic groove. The push rod passes through the slider, with one end extending into the engagement groove and the other end extending into the deflection path of the mounting rod. The push rod is used to press the electrode piece, causing the electrode piece to separate from the connecting piece.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The automatic sheet metal welding equipment of the present invention uses a range cleaning component that rotates circumferentially around the welding torch, thereby ensuring that the welding torch is always at the center of the cleaning range. When the movement path of the welding torch changes or the welding angle of the welding torch changes, the welding path is always within the cleaning range. At the same time, since the laser head rotates periodically around the welding torch in the present invention, the laser head not only performs laser cleaning on the area to be welded, but also on the already welded areas when cleaning the sheet metal parts.

[0026] 2. The automatic sheet metal welding equipment of the present invention effectively reduces the energy consumption of laser cleaning by focusing on cleaning only the area around the welding torch. Compared with high-intensity cleaning of only a small area around the welding torch, the present invention gradually reduces the cleaning intensity by increasing the distance from the welding torch, thereby significantly increasing the cleaning range with a small increase in energy consumption. This effectively improves the cleaning rate and reduces the probability of the welding path deviating from the cleaning path when the welding torch moves rapidly. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a perspective view of the present invention;

[0029] Figure 2This is a perspective view of the range cleaning component in this invention;

[0030] Figure 3 It is a 3D view of the drive mechanism;

[0031] Figure 4 It is a 3D assembly diagram of the connecting ring, mounting rod, and laser head;

[0032] Figure 5 This is a cross-sectional view of the connecting ring;

[0033] Figure 6 yes Figure 5 Enlarged view of a portion of point A in the middle;

[0034] Figure 7 This is a sectional view of the mounting slot;

[0035] In the diagram: 1. Multi-axis robotic arm; 11. Welding torch; 2. Mounting rod; 21. Laser head; 22. Emission port; 23. Drive motor; 24. Reciprocating screw; 25. Nut; 26. Rack; 27. Rotating wheel; 28. Mounting plate; 3. Connecting ring; 31. Ring groove; 32. Slider; 33. Limiting spring; 34. Mounting groove; 35. Guide tube; 4. Engaging groove; 41. Electrode plate; 42. Connecting plate; 5. Electric telescopic rod; 51. Telescopic groove; 52. Push rod. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figures 1 to 7 As shown, the automatic sheet metal welding equipment of the present invention includes a multi-axis robotic arm 1 and a welding torch 11. The welding torch 11 is installed at the end of the multi-axis robotic arm 1 and is used to weld sheet metal parts.

[0038] It also includes a range cleaning component, which is mounted on the multi-axis robotic arm 1 and performs range cleaning on the sheet metal parts with the welding torch 11 as the center.

[0039] The range cleaning assembly includes a mounting rod 2, a laser head 21, and a drive mechanism;

[0040] The mounting rods 2 are all rotatably mounted at the end of the multi-axis robotic arm 1, and the mounting rods 2 are coaxially designed with the welding torch 11.

[0041] A drive mechanism is fixedly installed at the end of the multi-axis robotic arm 1, and the drive mechanism is used to drive the mounting rod 2 to rotate in a circular motion.

[0042] The laser head 21 is fixedly mounted on the mounting rod 2. The laser head 21 has multiple emission ports 22, each of which is equipped with a laser emission system. The angles of the multiple emission ports 22 are all different.

[0043] In the field of sheet metal welding, the use of robotic arms and robots equipped with welding tools, along with precise control and optimized algorithms, enables high-quality automated welding of large sheet metal parts. In the automated welding process, in order to enhance the welding effect and reduce the tediousness of the operation, related technologies tend to mount auxiliary equipment on the robotic arms as well. This includes laser cleaning components for cleaning the area to be welded and the weld seam. In order to ensure that the welding path and the cleaning path are highly overlapped, this invention sets up a range cleaning component, with the welding torch 11 as the center, to perform laser cleaning on the surrounding area, effectively avoiding misalignment between the welding path and the cleaning path when the movement path of the welding torch 11 and the welding angle change.

[0044] Specifically, in this invention, the welding torch 11 is fixedly mounted at the end of the multi-axis robotic arm 1. The movement of the multi-axis robotic arm 1 controls the movement path of the welding torch 11 on the surface of the sheet metal part. The range cleaning component, also mounted on the multi-axis robotic arm 1, performs range cleaning around the welding torch 11. The mounting rod 2 is vertically mounted on the multi-axis robotic arm 1 and, driven by the drive mechanism, rotates in a circumferential direction around the welding torch 11. During the periodic rotation of the mounting rod 2, the laser head 21 mounted on the mounting rod 2 emits laser light onto the surface of the sheet metal part. During the rotation of the mounting plate 28, the laser head 21 forms a circumferential sweep around the welding torch 11, thereby forming a circular cleaning range on the sheet metal part. Combined with the linear or curved movement of the welding torch 11 carried by the multi-axis robotic arm 1, welding and cleaning are performed simultaneously, and the welding and cleaning paths highly overlap.

[0045] Compared to the parallel arrangement of cleaning and welding structures in related technologies, the cleaning component in this invention rotates circumferentially around the welding torch 11, ensuring that the welding torch 11 remains at the center of the cleaning range. Even as the movement path and welding angle of the welding torch 11 change, the welding path remains within the cleaning range. Furthermore, because the laser head 21 rotates periodically around the welding torch 11, it not only laser-cleans the area to be welded but also the already welded areas when cleaning sheet metal parts. Moreover, because the laser head 21 has multiple... Each of the multiple emission ports 22 is equipped with a laser emission system. During the cleaning process, the laser emission system emits laser light under the control of a pre-set program. The laser light is focused onto the sheet metal part, and the beam is absorbed by the surface of the sheet metal part, thereby achieving non-contact cleaning of the sheet metal part. Since the angles of the multiple emission ports 22 are different, when the laser head 21 rotates periodically with the mounting rod 2, the laser light, which travels in a straight line, can irradiate the sheet metal part at different angles, thereby reducing the probability of laser blockage, enhancing the comprehensiveness of laser cleaning, and thus enhancing the welding effect or the cleaning effect on the weld.

[0046] In a preferred embodiment of the present invention, the driving mechanism includes a drive motor 23, a reciprocating lead screw 24, a nut 25, a rack 26, and a rotating wheel 27;

[0047] A mounting plate 28 is fixedly installed on the multi-axis robotic arm 1, and a drive motor 23 is fixedly installed on the mounting plate 28;

[0048] A reciprocating lead screw 24 is fixedly installed at the output end of the drive motor 23, and a nut 25 is installed on the reciprocating lead screw 24. The reciprocating lead screw 24 and the nut 25 form a helical transmission pair.

[0049] A rack 26 is fixedly installed on one side of the nut 25, and a rotating wheel 27 is rotatably installed at the end of the multi-axis robotic arm 1. The rotating wheel 27 is connected to the mounting rod 2, and the rotating wheel 27 is meshed with the rack 26.

[0050] The rotating wheel 27 rotates at an angle greater than 360 degrees in a single rotation.

[0051] When the drive mounting rod 2 rotates in a circular motion, the output end of the drive motor 23 rotates, which in turn causes the reciprocating screw 24 to rotate. Since the reciprocating screw 24 and the nut 25 form a helical transmission pair, when the reciprocating screw 24 rotates, the nut 25 moves linearly back and forth along the axial direction of the reciprocating screw 24. The rack 26 fixed on the nut 25 meshes with the rotating wheel 27, causing the rotating wheel 27 to rotate. Since the rotating wheel 27 is connected to the mounting rod 2, when the rotating wheel 27 rotates, it drives the mounting rod 2 to rotate in a circular direction. When the mounting rod 2 rotates, the single rotation angle of the rotating wheel 27 is greater than 360 degrees, thus avoiding dead angles in laser cleaning. During the driving process, as the movement direction of the nut 25 changes, the rotation direction of the rotating wheel 27 changes periodically. On the one hand, when assembling and matching components such as wires, the periodic change of the rotation direction can effectively reduce the probability of wire entanglement and facilitate the installation of matching wires. On the other hand, the change of the rotation direction changes the direction of the laser's scanning path on the sheet metal parts, which can reduce the probability of the generation of scanning dead angles.

[0052] In a preferred embodiment of the present invention, the mounting rods 2 are designed in multiple ways, and laser heads 21 are mounted on each of the multiple mounting rods 2. The length of the laser head 21 matches the length of the mounting rod 2. The lengths of the multiple mounting rods 2 are not the same, and the length of the mounting rod 2 decreases step by step as the distance between the mounting rod 2 and the sheet metal part is shortened.

[0053] In the laser cleaning process, to further reduce energy consumption and concentrate cleaning on the welding path as much as possible, multiple mounting rods 2 are provided in this invention, each equipped with a laser head 21. While the mounting rods 2 rotate along the same path, their different lengths and the different scanning lengths of the laser heads 21 result in different laser scanning areas. Furthermore, since all mounting rods 2 rotate around the welding torch 11, the circular areas formed by the laser heads 21 are arranged concentrically. Therefore, the closer to the welding torch, the greater the difference in area. The more times the weld seam where the welding torch 11 is located is scanned, the stronger the cleaning force on its surface. Therefore, compared to performing high-intensity cleaning on a large area around the welding torch 11, this invention only focuses on cleaning the area around the welding torch 11, thus effectively reducing the energy consumption of laser cleaning. Compared to performing high-intensity cleaning on a small area around the welding torch 11, this invention gradually reduces the cleaning force by increasing the distance from the welding torch 11, thus significantly increasing the cleaning range with a small increase in energy consumption. Therefore, it effectively improves the cleaning rate and reduces the probability of the welding path deviating from the cleaning path when the welding torch 11 moves rapidly.

[0054] In a preferred embodiment of the present invention, a connecting ring 3 is fixedly installed on the rotating wheel 27. The connecting ring 3 has multiple annular grooves 31, and a slider 32 is slidably installed in each annular groove 31. The mounting rod 2 is installed on the slider 32. A limit spring 33 is fixedly installed on the connecting ring 3. The limit spring 33 is fixedly connected to the slider 32 and is used to limit the slider 32.

[0055] The connecting ring 3 has mounting grooves 34 on both the upper and lower sides of the ring groove 31. A guide tube 35 is rotatably installed at the end of the mounting groove 34, and the limiting spring 33 is fixedly installed in the mounting groove 34.

[0056] During the welding process of sheet metal parts, since the range cleaning component and welding torch 11 are both installed at the end of the multi-axis robotic arm 1, when the multi-axis robotic arm 1 drives the welding torch 11 to move, the mounting rod 2 and laser head 21 may come into contact with the sheet metal parts during rotation. To avoid serious collisions between the rotating mounting rod 2 and laser head 21 and the sheet metal parts, the connecting ring 3 of this invention has an annular groove 31, in which a slider 32 is slidably installed. The mounting rod 2 is installed on the slider 32, and the initial position of the slider 32 is fixed by a limiting spring 33. When the drive mechanism drives the rotating wheel 27 to rotate, the connecting ring 3 rotates synchronously, and under the action of the limiting spring 33, multiple mounting rods 2 are controlled to rotate synchronously. When the mounting rod 2 and laser head 21 come into contact with the sheet metal parts during rotation and there is a movement conflict, the obstruction of the sheet metal parts... When the rotation of the mounting rod 2 or laser head 21 is blocked, a tendency for relative motion occurs between the slider 32 and the continuously rotating connecting ring 3. Under this tendency, the limiting spring 33 is stretched, causing relative motion between the connecting ring 3 and the slider 32. As the rotating wheel 27 continues to rotate until it changes direction, the slider 32 eventually moves to its initial position under the tendency of the limiting spring 33 to recover its deformation during the reverse rotation of the rotating wheel 27. It then rotates synchronously with the rotating wheel 27 until it is restricted again. During this process, the relative motion between the slider 32 and the connecting ring 3 allows the cleaning range of the range cleaning component to vary according to the location to be cleaned, making it suitable for welding in narrow gaps and other areas. It also reduces the probability of damage when the equipment is obstructed by the relative motion between the slider 32 and the connecting ring 3.

[0057] In a preferred embodiment of the present invention, the inner wall of the annular groove 31 is provided with a meshing groove 4, which is an arc-shaped groove. An electrode plate 41 is elastically installed in the meshing groove 4 by a spring. The electrode plate 41 is connected to a power supply cable. A connecting piece 42 is installed on one end of the slider 32 facing the meshing groove 4. The connecting piece 42 is electrically connected to the laser head 21. In the initial state, the slider 32 extends into the meshing groove 4, and the connecting piece 42 is electrically connected to the electrode plate 41.

[0058] During the synchronous rotation of the rotating wheel 27 and the connecting ring 3, due to the limiting effect of the limiting spring 33, the slider 32 initially extends into the meshing groove 4, and the electrode plate 41 in the meshing groove 4, under the action of the spring, aligns with the electrode plate 41 on the slider 32, making the laser head 21 connected to the power supply cable. However, during the rotation following the connecting ring 3, when the laser head 21 is restricted, the slider 32 disengages from the meshing groove 4. At this time, the electrode plate 41 separates from the connecting plate 42, thereby de-energizing the laser head 21, until the slider 32 aligns with the meshing groove 4 again. During this process, it is under restriction. The laser head 21 in the controlled state cannot continuously emit laser light, thus avoiding excessive cleaning time and intensity of the laser head 21 on local areas of the sheet metal parts. At the same time, since the lengths of the multiple mounting rods 2 and the laser head 21 vary in stages, and the laser head 21 becomes longer as it gets closer to the end of the welding gun 11, the laser head 21 farther away from the end of the welding gun 11 is much more likely to be blocked than the laser head 21 closer to the end of the welding gun 11. Powering off the blocked laser head 21 can also prevent the laser emitted by the blocked laser head 21 from acting on the unblocked laser head 21, thereby reducing the probability of equipment damage.

[0059] In a preferred embodiment of the present invention, the mounting rod 2 and the slider 32 are both hingedly connected, and an electric telescopic rod 5 is hingedly mounted on the slider 32. The end of the electric telescopic rod 5 away from the slider 32 is hinged to the mounting rod 2.

[0060] The slider 32 has symmetrically designed telescopic grooves 51. The connecting piece 42 is located between the telescopic grooves 51. A push rod 52 is slidably installed in the telescopic groove 51. The push rod 52 passes through the slider 32, and one end of the push rod 52 extends into the meshing groove 4 and the other end extends into the deflection path of the mounting rod 2. The push rod 52 is used to press the electrode piece 41, causing the electrode piece 41 to separate from the connecting piece 42.

[0061] Before welding the sheet metal parts, when programming the motion program of the multi-axis robotic arm 1, the staff, based on the actual movement position of the welding torch 11, combined it with the control program of the electric telescopic rod 5. By associating the control program of the electric telescopic rod 5 with the control program of the multi-axis robotic arm 1, when the welding torch 11 is welding in narrow slits or other areas, the electric telescopic rod 5 is controlled to extend, thereby gradually pushing the mounting rod 2 from long to short. This allows the mounting rod 2 and the laser head 21 to be parallel and attached to the side wall of the connecting ring 3, further reducing the distance between the mounting rod 2, the laser head 21, and the sheet metal parts. The probability of contact is reduced. After welding is completed, multiple mounting rods 2 and laser heads 21 can be deflected to the side wall of the connecting ring 3, which facilitates the movement of the multi-axis robotic arm 1 in space. During the deflection of the mounting rods 2, the mounting rods 2 squeeze the push rods 52, which causes the push rods 52 to move along the telescopic grooves 51 into the meshing grooves 4 and press the electrode plates 41 in the meshing grooves 4, causing the electrode plates 41 to separate from the connecting plates 42, thereby shutting off the laser head 21 and preventing the non-working laser head 21 from emitting lasers and causing safety hazards.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheet metal part automatic welding equipment, comprising a multi-axis mechanical arm (1) and a welding gun (11), the welding gun (11) is installed at the end of the multi-axis mechanical arm (1), and the welding gun (11) is used for welding the sheet metal part. characterized in that It also includes a range cleaning assembly, which is installed on the multi-axis mechanical arm (1), and the range cleaning assembly is centered on the welding gun (11) to clean the sheet metal part; The range cleaning assembly comprises a mounting rod (2), a laser head (21) and a driving mechanism; The mounting rod (2) is rotatably installed at the end of the multi-axis mechanical arm (1), and the mounting rod (2) is coaxially designed with the welding gun (11); The driving mechanism is fixedly installed at the end of the multi-axis mechanical arm (1), and the driving mechanism is used to drive the mounting rod (2) to rotate circumferentially; The laser head (21) is fixedly installed on the mounting rod (2), a plurality of emission ports (22) are formed in the laser head (21), a laser emission system is installed in each of the emission ports (22), and the angles of the plurality of emission ports (22) are different; The driving mechanism comprises a driving motor (23), a reciprocating screw (24), a nut (25), a rack (26) and a rotating wheel (27); The multi-axis mechanical arm (1) is fixedly installed with a mounting plate (28), and the driving motor (23) is fixedly installed on the mounting plate (28); The driving motor (23) is fixedly installed with the reciprocating screw (24) at the output end, the nut (25) is installed on the reciprocating screw (24), and the reciprocating screw (24) and the nut (25) constitute a screw transmission pair; One side of the nut (25) is fixedly installed with the rack (26), the rotating wheel (27) is rotatably installed at the end of the multi-axis mechanical arm (1), the rotating wheel (27) is connected with the mounting rod (2), and the rotating wheel (27) is in meshing connection with the rack (26); The mounting rod (2) is designed in plurality, a plurality of laser heads (21) are installed on the mounting rod (2), the length of the laser head (21) matches the length of the mounting rod (2), the lengths of the plurality of mounting rods (2) are different, and the lengths of the plurality of mounting rods (2) gradually decrease as the distance between the mounting rod (2) and the sheet metal part shortens; The rotating wheel (27) is fixedly installed with a connecting ring (3), a plurality of ring grooves (31) are formed in the connecting ring (3), a sliding block (32) is slidably installed in each of the ring grooves (31), the mounting rod (2) is installed on the sliding block (32), a limiting spring (33) is fixedly installed on the connecting ring (3), the limiting spring (33) is fixedly connected with the sliding block (32), and the limiting spring (33) is used for limiting the sliding block (32).

2. The apparatus according to claim 1, wherein: The single rotation angle of the rotating wheel (27) is greater than 360 degrees.

3. The apparatus according to claim 1, wherein: Mounting grooves (34) are formed on the upper and lower sides of the ring groove (31), a guide pipe (35) is rotatably installed at the end of the mounting groove (34), and the limiting spring (33) is fixedly installed in the mounting groove (34).

4. The apparatus according to claim 3, wherein: The inner wall of the ring groove (31) is provided with an engaging groove (4), which is an arc-shaped groove. An electrode sheet (41) is elastically mounted in the engaging groove (4) by a spring. The electrode sheet (41) is connected with a power supply cable. The slider (32) is provided at one end thereof with a connecting sheet (42), which is in conductive connection with the laser head (21). In the initial state, the slider (32) extends into the engaging groove (4), and the connecting sheet (42) is in electrical connection with the electrode sheet (41).

5. The apparatus according to claim 4, wherein: The mounting rod (2) and the slider (32) are hingedly connected. An electric telescopic rod (5) is hingedly mounted on the slider (32). The electric telescopic rod (5) is hingedly connected to the mounting rod (2) at the end thereof away from the slider (32).

6. The apparatus according to claim 5, wherein: The slider (32) is provided with symmetrically designed telescopic grooves (51). The connecting sheet (42) is located between the telescopic grooves (51). A push rod (52) is slidably mounted in the telescopic grooves (51). The push rod (52) penetrates the slider (32) and extends into the engaging groove (4) at one end and extends onto the deflection path of the mounting rod (2) at the other end. The push rod (52) is used to press the electrode sheet (41), so that the electrode sheet (41) is separated from the connecting sheet (42).

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