A thin-walled part laser welding machine and welding method

Abstract

The application discloses a kind of thin-walled part laser welding machine and welding method, belong to laser welding field, including base, the base top is equipped with welding machine body;The base top is fixedly connected with electric rotary lever, the electric rotary lever top is fixedly connected with carousel, the carousel top is equipped with three sliding grooves, three The inner wall of sliding groove is slidably connected with inner ring clamping plate, the inner ring clamping plate back is fixedly connected with connecting rod, and the connecting rod back is fixedly connected with magnet conductor. By workpiece being placed on the carousel, the outer wall is fixed by the outer ring clamping assembly, the stability of workpiece during welding is ensured, when the carousel rotates to one hundred and twenty degrees, the inner ring clamping plate is moved outward by magnetic force connection trigger, to further fix the inner wall of workpiece, the dynamic clamping mode avoids the deformation problem of clamping part due to heat accumulation caused by long time fixed inner ring, and protects the inner wall of workpiece.

Description

Technical Field

[0001] This application relates to the field of laser welding, and more specifically, to a laser welding machine and welding method for thin-walled parts. Background Technology

[0002] Current welding processes utilize tooling clamping. The tooling positions and clamps the parts to be welded, eliminating the effects of dimensional deformation. A three-jaw chuck then holds the tooling in place for rotary arc welding. This tooling clamping method involves frequent manual disassembly and assembly, and the welding operation relies heavily on the operator's experience and understanding of the welding process. This process is difficult to quantify and monitor, has low production efficiency, and is difficult to scale up to improve efficiency. Furthermore, in cases where thin-walled parts may have large gaps, the welding effect may be poor, potentially resulting in welding defects that require rework.

[0003] Patent document CN114619145B discloses a laser welding machine and welding method for thin-walled parts. The welding device includes a base plate, a fixed gantry motion mechanism, a workpiece rotation mechanism, an outer ring clamping mechanism, an inner ring clamping mechanism, and optical components. The base plate provides the mounting foundation. The fixed gantry motion mechanism, the workpiece rotation mechanism, and the clamping mechanism work together to ensure that the weld seam of the part can be exposed at the laser focal point. The optical components realize the function of laser light output and the functions of measuring the working position and planning the working path. The coaxial image of the welding head of the optical components is used to track the path movement of the weld seam during the welding process and monitor the welding status of the workpiece. Visual positioning recognition and auxiliary light source provide positioning function to ensure that the welding position of the part is consistent with the set position. The welding device uses the clamping mechanism to locally clamp the inside and outside of the part. It uses image technology for trajectory planning and image teaching, which allows for intuitive programming, simplifies the operator's programming, and provides stable positioning, high welding efficiency, and high quality. Although the above-mentioned application can fix the inner wall, if the inner ring is fixed continuously, the heat generated during the welding process may cause deformation of the clamping part. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a laser welding machine and welding method for thin-walled parts, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this application provides a laser welding machine for thin-walled parts, including a base, on the top of which a welding machine body is mounted;

[0006] An electric rotating rod is fixedly connected to the top of the base, and a turntable is fixedly connected to the top of the electric rotating rod. The top of the turntable has three sliding grooves, and an inner ring clamping plate is slidably connected to the inner wall of the three sliding grooves. A connecting rod is fixedly connected to the back of the inner ring clamping plate, and a magnetic conductor is fixedly connected to the back of the connecting rod. A frame is fixedly connected to the top of the base, and three permanent magnets are fixedly connected to the inner wall of the frame. A first spring is fixedly connected to the front of the inner ring clamping plate. An air blowing device for preventing weld oxidation is installed on the top of the base, and a grinding device for grinding the weld is installed on the top of the base.

[0007] Preferably, an outer ring clamping assembly is fixedly connected to the top of the turntable, and the two ends of the first spring are respectively fixedly connected to the back of the inner wall of the slide groove and the front of the inner ring clamping plate.

[0008] Preferably, the air blowing device includes a fixing block, which is fixedly connected to the top of the base. A hydraulic chamber is fixedly connected to the top of the fixing block. A first hydraulic rod is slidably connected to a piston at one end inside the hydraulic chamber. A second spring is movably sleeved on the outer wall of the first hydraulic rod. A trigger block is fixedly sleeved on the outer wall of the electric rotating rod.

[0009] Preferably, the two ends of the second spring are fixedly connected to the front of the hydraulic chamber and the back of the first hydraulic rod, respectively. Inside the hydraulic chamber, one end of the piston is slidably connected to the second hydraulic rod. The top of the hydraulic chamber is fixedly connected to a fixing rod, and the bottom of the fixing rod is fixedly connected to an air cylinder.

[0010] Preferably, the top of the second hydraulic rod is slidably connected to the inner wall of the air cylinder via a piston, and a nozzle is fixedly connected to the front of the air cylinder.

[0011] Preferably, the grinding device includes a vertical plate, which is fixedly connected to the top of the base. A gear ring is fixedly connected to the top of the turntable. A rotating rod is rotatably connected to the front of the vertical plate via a bearing. An electric telescopic rod is rotatably connected to the front of the vertical plate via a bearing. A grinding disc is fixedly connected to the front of the electric telescopic rod.

[0012] Preferably, the rotating rod extends movably through the vertical plate to the back, the electric telescopic rod extends movably through the vertical plate to the back, the extension end of the rotating rod and the extension end of the electric telescopic rod are connected by a belt pulley, and a bevel gear is fixedly connected to the back of the rotating rod, the bevel gear meshing with the gear ring.

[0013] A laser welding method for thin-walled parts includes the following steps:

[0014] Step 1: Place the workpiece on top of the turntable, activate the outer ring clamping assembly to fix the outer wall of the workpiece, activate the welding machine body to weld the workpiece, activate the electric rotating rod, the electric rotating rod drives the turntable to rotate, the turntable drives the fixed workpiece to rotate, after the turntable rotates 120 degrees, the magnetic conductor and the permanent magnet generate magnetic connection, the magnetic conductor drives the connecting rod to move outward, the connecting rod drives the inner ring clamping plate to move outward, the first spring is stretched, so that the three inner ring clamping plates fix the inner wall of the workpiece, so that the welding machine body continues to weld the workpiece. When the turntable rotates to the neutral position of the permanent magnet, the first spring drives the inner ring clamping plate to reset.

[0015] Step 2: When the electric rotary rod rotates, it drives the trigger block to rotate. The rotating trigger block squeezes the first hydraulic rod, causing the first hydraulic rod to move backward. During the movement of the first hydraulic rod, the pressure inside the hydraulic chamber increases, causing the second hydraulic rod to move forward. The second hydraulic rod squeezes the piston, causing the gas inside the air cylinder to be ejected through the nozzle to blow air onto the weld. When the trigger block rotates and no longer squeezes the first hydraulic rod, the second spring drives the first hydraulic rod to move forward and the second hydraulic rod to move backward. The second hydraulic rod then drives the piston to draw in air again, causing the air cylinder to be refilled with gas.

[0016] Step 3: The rotation of the turntable causes the gear ring on the outer wall to rotate, which in turn causes the bevel gear to rotate, which in turn causes the rotating rod to rotate, which in turn causes the pulley to rotate, which in turn causes the electric telescopic rod to rotate, which in turn causes the grinding disc to move forward to grind the weld.

[0017] The advantages of this application are:

[0018] 1. This application involves placing the workpiece on a turntable and fixing its outer wall with an outer ring clamping assembly to ensure the stability of the workpiece during welding. When the turntable rotates to 120 degrees, the inner ring clamping plate is triggered to move outward through magnetic connection, further fixing the inner wall of the workpiece. The dynamic clamping method avoids the problem of deformation of the clamping part due to heat accumulation caused by fixing the inner ring for a long time, thus protecting the inner wall of the workpiece.

[0019] 2. This application uses the rotation of an electric rotary rod to drive a trigger block. The trigger block increases the internal pressure of the hydraulic chamber by squeezing the first hydraulic rod, which in turn pushes the second hydraulic rod to move. The second hydraulic rod squeezes the piston, causing the gas in the air cylinder to be ejected through the nozzle to blow air onto the weld. Blowing air prevents the weld from oxidizing, reduces the formation of porosity, and further improves the strength and corrosion resistance of the weld.

[0020] Third, this application uses a rotating turntable to drive a gear ring, which in turn drives a rotating rod to rotate via a bevel gear. The rotating rod then drives an electric telescopic rod to rotate via a pulley. The electric telescopic rod pushes the grinding disc toward the weld to grind the weld. Grinding can remove slag, spatter, and uneven parts from the weld surface, making the weld surface smoother and the weld appearance more aesthetically pleasing. It also helps to reduce stress concentration and improve the fatigue strength of the weld. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure on the right side of the present invention;

[0024] Figure 3 This is a partial structural diagram of the present invention. Figure 1 ;

[0025] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point B;

[0026] Figure 5 This is a partial structural diagram of the present invention. Figure 2 ;

[0027] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point C;

[0028] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0029] In the above image,

[0030] 1. Base; 21. Electric rotating rod; 22. Turntable; 23. Inner ring clamping plate; 24. Connecting rod; 25. Magnetic conductor; 26. Frame; 27. Permanent magnet; 28. First spring; 3. Air blowing device; 31. Fixing block; 32. Hydraulic chamber; 33. Trigger block; 34. First hydraulic rod; 35. Second spring; 36. Fixing rod; 37. Second hydraulic rod; 38. Air cylinder; 39. Nozzle; 4. Grinding device; 41. Vertical plate; 42. Gear ring; 43. Rotating rod; 44. Bevel gear; 45. Pulley; 46. Electric telescopic rod; 47. Grinding disc; 5. Welding machine body; 6. Outer ring clamping assembly. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Example 1: See Figures 1-4 This embodiment provides a laser welding machine for thin-walled parts, including a base 1, with a welding machine body 5 mounted on the top of the base 1;

[0038] An electric rotating rod 21 is fixedly connected to the top of the base 1. A turntable 22 is fixedly connected to the top of the electric rotating rod 21. The top of the turntable 22 has three sliding grooves, and an inner ring clamping plate 23 is slidably connected to the inner wall of the three sliding grooves. A connecting rod 24 is fixedly connected to the back of the inner ring clamping plate 23, and a magnetic conductor 25 is fixedly connected to the back of the connecting rod 24. A frame 26 is fixedly connected to the top of the base 1. Three permanent magnets 27 are fixedly connected to the inner wall of the frame 26. A first spring 28 is fixedly connected to the front of the inner ring clamping plate 23. An air blowing device 3 for preventing weld oxidation is installed on the top of the base 1, and a grinding device 4 for grinding the weld is also installed on the top of the base 1. The combination of the base 1 and the welding machine body 5 makes the laser welding process more stable and efficient. The design of the electric rotating rod 21 and the turntable 22 allows the workpiece to rotate during the welding process, ensuring the uniformity of the welding. The combined use of the inner ring clamping plate 23, permanent magnets 27, and magnetic conductors 25 enhances the clamping force of the workpiece, keeping the workpiece stable during the welding process. The air blowing device 3 prevents weld oxidation, while the grinding device 4 performs subsequent processing on the weld, thereby improving welding quality. An outer ring clamping assembly 6 is fixedly connected to the top of the turntable 22. The outer ring clamping assembly 6 includes a hydraulic cylinder, which is fixedly connected to the top of the turntable 22. An outer ring clamping plate is fixedly connected to the output end of the hydraulic cylinder. The two ends of a first spring 28 are respectively fixedly connected to the back of the inner wall of the slide groove and the front of the inner ring clamping plate 23. The outer ring clamping assembly 6 on the top of the turntable 22 can more firmly clamp the outer wall of the workpiece, enhancing clamping stability. The design of the first spring 28 ensures that the inner ring clamping plate 23 can adapt to the movement of the turntable 22 during processing and effectively clamp the workpiece.

[0039] In practical use, the workpiece is placed on top of the turntable 22. The outer ring clamping assembly 6 is activated to fix the outer wall of the workpiece. The welding machine body 5 is activated to weld the workpiece. The electric rotating rod 21 is activated, which drives the turntable 22 to rotate. The turntable 22 drives the fixed workpiece to rotate. After the turntable 22 rotates 120 degrees, the magnetic conductor 25 and the permanent magnet 27 are magnetically connected. The magnetic conductor 25 drives the connecting rod 24 to move outward. The connecting rod 24 drives the inner ring clamping plate 23 to move outward. The first spring 28 is stretched, so that the three inner ring clamping plates 23 fix the inner wall of the workpiece, allowing the welding machine body 5 to continuously weld the workpiece. When the turntable 22 rotates to the neutral position of the permanent magnet 27, the first spring 28 drives the inner ring clamping plate 23 to reset.

[0040] Example 2: See Figures 1-5 Based on Embodiment 1, the air blowing device 3 includes a fixing block 31, which is fixedly connected to the top of the base 1. A hydraulic chamber 32 is fixedly connected to the top of the fixing block 31. A first hydraulic rod 34 is slidably connected to one end of the piston inside the hydraulic chamber 32. A second spring 35 is movably sleeved on the outer wall of the first hydraulic rod 34. A trigger block 33 is fixedly sleeved on the outer wall of the electric rotating rod 21. The design of the air blowing device 3, especially the structures of the hydraulic chamber 32, the first hydraulic rod 34, and the trigger block 33, ensures the precise control of the air blowing device 3. By increasing the pressure of the hydraulic chamber 32 and the precise control of the nozzle 39, defects caused by oxidation during the welding process can be effectively prevented, ensuring welding quality. The two ends of the second spring 35 are fixedly connected to the front of the hydraulic chamber 32 and the back of the first hydraulic rod 34, respectively. A second hydraulic rod 37 is slidably connected to one end of the piston inside the hydraulic chamber 32. A fixing rod 36 is fixedly connected to the top of the hydraulic chamber 32, and an air cylinder 38 is fixedly connected to the bottom of the fixing rod 36. Through the hydraulic control structure, the force and accuracy of the gas ejection are enhanced. The second hydraulic rod 37 and the air cylinder 38 can effectively regulate the gas flow rate to ensure the stability of the gas blowing to the weld, prevent oxidation and impurities from entering the weld area, and ensure smooth welding. The top of the second hydraulic rod 37 is slidably connected to the inner wall of the air cylinder 38 via a piston. A nozzle 39 is fixedly connected to the front of the air cylinder 38. The design of the air cylinder 38 and the nozzle 39 ensures the accuracy of gas ejection, enabling efficient blowing to the welding area, reducing oxidation, and ensuring the consistency of weld quality.

[0041] In practical use, when the electric rotary rod 21 rotates, it drives the trigger block 33 to rotate. The rotating trigger block 33 compresses the first hydraulic rod 34, causing the first hydraulic rod 34 to move backward. During the movement of the first hydraulic rod 34, the internal pressure of the hydraulic chamber 32 increases, causing the second hydraulic rod 37 to move forward. The second hydraulic rod 37 compresses the piston, causing the gas inside the air cylinder 38 to be ejected through the nozzle 39 to blow air onto the weld. When the trigger block 33 rotates and no longer compresses the first hydraulic rod 34, the second spring 35 drives the first hydraulic rod 34 to move forward, and the second hydraulic rod 37 to move backward. The second hydraulic rod 37 then drives the piston to draw in air again, causing the air cylinder 38 to be refilled with gas.

[0042] Example 3: See Figures 1-7Based on Embodiment 1, the grinding device 4 includes a vertical plate 41, which is fixedly connected to the top of the base 1. A gear ring 42 is fixedly connected to the top of the turntable 22. A rotating rod 43 is rotatably connected to the front of the vertical plate 41 via a bearing. An electric telescopic rod 46 is rotatably connected to the front of the vertical plate 41 via a bearing. A grinding disc 47 is fixedly connected to the front of the electric telescopic rod 46. The design of the grinding device 4, including components such as the vertical plate 41 and the grinding disc 47, enables fine grinding of the weld after welding, ensuring the surface smoothness of the weld and avoiding the generation of rough surfaces or irregular weld joints. A rotating rod 43 extends movably through the vertical plate 41 to the back, and an electric telescopic rod 46 extends movably through the vertical plate 41 to the back. The extended ends of the rotating rod 43 and the electric telescopic rod 46 are connected via a pulley 45. A bevel gear 44 is fixedly connected to the back of the rotating rod 43, and the bevel gear 44 meshes with a gear ring 42. Through the design of the mechanical transmission system including the rotating rod 43, bevel gear 44, and gear ring 42, the grinding device 4 can move precisely and synchronously, ensuring a uniform and stable grinding effect. The pulley 45 enables the grinding disc 47 to continuously and stably grind the weld.

[0043] In actual use, the above equipment rotates, causing the gear ring 42 on the outer wall to rotate, the gear ring 42 to rotate, the bevel gear 44 to rotate, the bevel gear 44 to rotate, the rotating rod 43 to rotate, the rotating rod 43 to rotate, the pulley 45 to rotate, the pulley 45 to rotate, the electric telescopic rod 46 to rotate, and the electric telescopic rod 46 to move the grinding disc 47 to the front to grind the weld.

[0044] In specific use, the above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser welding machine for thin-walled parts, comprising a base (1), wherein a welding machine body (5) is mounted on the top of the base (1); Its features are, The base (1) is fixedly connected to an electric rotating rod (21) at the top. The electric rotating rod (21) is fixedly connected to a turntable (22) at the top. The turntable (22) has three sliding grooves at the top. The inner walls of the three sliding grooves are slidably connected to an inner ring clamping plate (23). The back of the inner ring clamping plate (23) is fixedly connected to a connecting rod (24). The back of the connecting rod (24) is fixedly connected to a magnetic conductor (25). The base (1) is fixedly connected to a frame (26). The inner wall of the frame (26) is fixedly connected to three permanent magnets (27). The front of the inner ring clamping plate (23) is fixedly connected to a first spring (28). The base (1) is equipped with an air blowing device (3) for preventing weld oxidation at the top. The base (1) is equipped with a grinding device (4) for grinding the weld at the top. The air blowing device (3) includes a fixing block (31), which is fixedly connected to the top of the base (1). The top of the fixing block (31) is fixedly connected to a hydraulic chamber (32). A first hydraulic rod (34) is slidably connected to a piston at one end inside the hydraulic chamber (32). A second spring (35) is movably sleeved on the outer wall of the first hydraulic rod (34). A trigger block (33) is fixedly sleeved on the outer wall of the electric rotating rod (21). The two ends of the second spring (35) are fixedly connected to the front of the hydraulic chamber (32) and the back of the first hydraulic rod (34), respectively. The piston at one end of the hydraulic chamber (32) is slidably connected to the second hydraulic rod (37). The top of the hydraulic chamber (32) is fixedly connected to a fixing rod (36), and the bottom of the fixing rod (36) is fixedly connected to an air cylinder (38). The top of the second hydraulic rod (37) is slidably connected to the inner wall of the air cylinder (38) via a piston, and a nozzle (39) is fixedly connected to the front of the air cylinder (38). The grinding device (4) includes a vertical plate (41), which is fixedly connected to the top of the base (1). A gear ring (42) is fixedly connected to the top of the turntable (22). A rotating rod (43) is rotatably connected to the front of the vertical plate (41) through a bearing. An electric telescopic rod (46) is rotatably connected to the front of the vertical plate (41) through a bearing. A grinding disc (47) is fixedly connected to the front of the electric telescopic rod (46).

2. The laser welding machine for thin-walled parts according to claim 1, characterized in that, The turntable (22) is fixedly connected to the top of an outer ring clamping assembly (6), and the two ends of the first spring (28) are fixedly connected to the back of the inner wall of the slide and the front of the inner ring clamping plate (23), respectively.

3. The laser welding machine for thin-walled parts according to claim 1, characterized in that, The rotating rod (43) extends movably through the vertical plate (41) to the back side, and the electric telescopic rod (46) extends movably through the vertical plate (41) to the back side. The extension end of the rotating rod (43) and the extension end of the electric telescopic rod (46) are connected by a belt pulley (45). A bevel gear (44) is fixedly connected to the back side of the rotating rod (43), and the bevel gear (44) meshes with the gear ring (42).

4. A laser welding method for thin-walled parts, wherein the method employs a laser welding machine for thin-walled parts as described in any one of claims 1-3, characterized in that... Includes the following steps: Step 1: Place the workpiece on top of the turntable (22), start the outer ring clamping assembly (6) to fix the outer wall of the workpiece, start the welding machine body (5) to weld the workpiece, start the electric rotating rod (21), the electric rotating rod (21) drives the turntable (22) to rotate, the turntable (22) drives the fixed workpiece to rotate, after the turntable (22) rotates 120 degrees, the magnetic conductor (25) and the permanent magnet (27) generate magnetic connection, the magnetic conductor (25) drives the connecting rod (24) to move outward, the connecting rod (24) drives the inner ring clamping plate (23) to move outward, the first spring (28) is stretched, so that the three inner ring clamping plates (23) fix the inner wall of the workpiece, so that the welding machine body (5) continues to weld the workpiece, when the turntable (22) rotates to the neutral position of the permanent magnet (27), the first spring (28) drives the inner ring clamping plate (23) to reset; Step 2: When the electric rotary rod (21) rotates, it drives the trigger block (33) to rotate. The trigger block (33) rotates and squeezes the first hydraulic rod (34), causing the first hydraulic rod (34) to move to the back. During the movement of the first hydraulic rod (34), the pressure inside the hydraulic chamber (32) increases, causing the second hydraulic rod (37) to move to the front. The second hydraulic rod (37) squeezes the piston, causing the gas inside the air cylinder (38) to be ejected through the nozzle (39) to blow air onto the weld. When the trigger block (33) rotates and stops squeezing the first hydraulic rod (34), the second spring (35) drives the first hydraulic rod (34) to move to the front, and the second hydraulic rod (37) to move to the back. The second hydraulic rod (37) drives the piston to draw in air again, causing the air cylinder (38) to be filled with gas again. Step 3: The rotation of the turntable (22) drives the gear ring (42) on the outer wall to rotate, the gear ring (42) drives the bevel gear (44) to rotate, the bevel gear (44) drives the rotating rod (43) to rotate, the rotating rod (43) drives the pulley (45) to rotate, the pulley (45) drives the electric telescopic rod (46) to rotate, and the electric telescopic rod (46) drives the grinding disc (47) to move forward to grind the weld.

Images