Welding equipment for chain machining

Abstract

The invention belongs to the technical field of chain machining, and particularly relates to chain machining welding equipment which comprises two workbenches, the middles of the workbenches are of hollow structures, an arc-shaped supporting block is arranged between the two workbenches, and welding assemblies are arranged at the upper ends of the workbenches. The welding assembly comprises first rectangular frames slidably arranged at the upper end of the workbench, two rectangular supporting blocks are slidably arranged on the opposite sides of the two first rectangular frames correspondingly, extrusion strips are fixedly connected to the opposite sides of the rectangular supporting blocks correspondingly, and first rectangular blocks are fixedly connected to the sides, away from the extrusion strips, of the rectangular supporting blocks correspondingly. The first rectangular blocks are slidably arranged in the second rectangular frames correspondingly, the first rectangular blocks are fixedly connected with one sides of the interiors of the second rectangular frames through springs, and the second rectangular frames are arranged in the first rectangular frames. Therefore, the surface of the chain is rough.

Description

Technical Field

[0001] The present invention belongs to the technical field of chain processing, and specifically relates to a welding device for chain processing. Background Art

[0002] A welding device refers to the equipment required to implement the welding process. The welding device includes a welding machine, welding process equipment, and welding auxiliary tools. Among them, the main one is the electric welding machine, which includes arc welding machines, resistance welding machines, plasma arc welding machines, high-frequency welding machines, etc. When processing a chain, a welding device is usually required to weld the joint part of the chain.

[0003] A patent application with the publication number CN116727918B discloses a welding device for chain processing. By clamping the chain on the outer surface of the conveying chain disc, the driving motor can drive the driving shaft and the conveying chain disc on its outer surface to rotate, thereby realizing the transmission of the chain. Using this method to convey the chain can ensure the uniform conveyance of the chain and ensure that the chain can be uniformly conveyed to the welding assembly, which is convenient for uniformly arranging the chain before welding the chain and convenient for using the welding assembly to perform welding operations on the chain.

[0004] In the prior art, resistance welding is generally used to weld the chain interface. When welding the chain joint, it is necessary to drive the extrusion block to abut against both sides of the two ends of the chain interface respectively, and then use the resistance heat generated by the current passing through the contact surface of the extrusion block to heat the chain interface. Subsequently, the two ends of the chain are extruded to make the chain interfaces approach each other. Since the extrusion block is in a stationary state, friction may occur with the extrusion block, resulting in a rough surface of the chain.

[0005] Therefore, the present invention provides a welding device for chain processing. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A welding device for chain processing according to the present invention includes two workbenches. The middle part of the workbench is of a hollow structure. An arc-shaped support block is provided between the two workbenches. A welding assembly is provided at the upper end of the workbench. The welding assembly includes first rectangular frames respectively slidably provided at the upper end of the workbench. Two rectangular support blocks are respectively slidably provided on the opposite sides of the two first rectangular frames. Extrusion strips are respectively fixedly connected to the opposite sides of the rectangular support blocks. First rectangular blocks are respectively fixedly connected to the sides of the rectangular support blocks away from the extrusion strips. The first rectangular blocks are respectively slidably arranged inside the second rectangular frames. The first rectangular blocks are fixedly connected to one side inside the second rectangular frames through springs. The second rectangular frames are arranged inside the first rectangular frames. An extrusion assembly is provided at the upper end of the arc-shaped support block. The extrusion assembly includes two extrusion blocks. The extrusion blocks are respectively slid on the upper end of the workbench through T-shaped blocks.

[0008] Preferably, second rectangular blocks are respectively fixedly connected to the sides of the second rectangular frames away from the rectangular support blocks. The two opposite second rectangular blocks are respectively slidably arranged inside the first rectangular frames. A bidirectional lead screw is commonly threadedly connected to the middle parts of the two opposite second rectangular blocks. The bidirectional lead screw is rotatably arranged inside the first rectangular frame.

[0009] Preferably, rectangular holes are respectively opened at the upper ends of the first rectangular frames. First rectangular strips are respectively fixedly connected to the upper ends of the second rectangular blocks. The first rectangular strips are slidably arranged inside the rectangular holes. Second rectangular strips are respectively fixedly connected to the upper ends of the first rectangular strips. The two opposite ends of the second rectangular strips are commonly slidably arranged inside the rectangular cylinder.

[0010] Preferably, push blocks respectively slidably penetrate through both sides of the arc-shaped support block. The push blocks are located at the bottom of the upper arc surface of the arc-shaped support block.

[0011] Preferably, a bottom plate is fixedly connected to the lower end of the workbench. Rectangular plates are respectively rotatably arranged on both sides of the arc-shaped support block. The lower end of the arc-shaped support block is fixedly connected to the bottom plate through support bars.

[0012] Preferably, fourth rectangular blocks are respectively rotatably connected to both sides of the rectangular plates. The fourth rectangular blocks are fixedly connected to both sides of the arc-shaped support block. Pin shafts are fixedly connected to both sides of the rectangular plates. The pin shafts rotatably penetrate through the fourth rectangular blocks and are fixedly connected to fifth rectangular strips. Sixth rectangular strips are respectively slidably arranged inside the opposite ends of the two fifth rectangular strips. A waist-shaped block is commonly rotatably connected to the opposite ends of the two sixth rectangular strips. Seventh rectangular strips are respectively fixedly connected to the lower ends of the waist-shaped block. An eighth rectangular strip is commonly fixedly connected to the lower ends of the seventh rectangular strips. The eighth rectangular strip is slidably arranged inside the lower part of the arc-shaped support block. A lead screw is threadedly connected to the middle part of the eighth rectangular strip. The lead screw is rotatably arranged at the lower end of the arc-shaped support block.

[0013] Preferably, waist-shaped holes are respectively provided in the middle of the rectangular plates. A first cylindrical bar is slidably arranged inside the waist-shaped holes. A second cylindrical bar is fixedly connected to the lower end of the first cylindrical bar. Fifth rectangular blocks are rotatably connected to both sides of the second cylindrical bar. Third cylindrical bars are respectively fixedly connected to one side of the fifth rectangular blocks. The third cylindrical bars are slidably arranged inside sixth rectangular blocks, and the sixth rectangular blocks are fixedly connected to the lower end of the rectangular plates.

[0014] Preferably, first support rods are respectively rotatably connected to the lower sides of the ends of the rectangular plates far from the arc-shaped support blocks. The lower ends of the first support rods are slidably arranged inside second support rods, and the second support rods are rotatably arranged on the upper end of the bottom plate.

[0015] Preferably, a first arc-shaped block is slidably arranged in the middle of the upper end of the workbench on one side. Two second arc-shaped blocks are provided on the upper end of the extrusion block on one side.

[0016] Preferably, third rectangular strips are respectively fixedly connected to the upper ends of the second arc-shaped blocks. Fourth rectangular strips are respectively slidably connected to the upper ends of the third rectangular strips. The lower ends of the fourth rectangular strips are slidably arranged on the upper end of the workbench through third rectangular blocks.

[0017] The beneficial effects of the present invention are as follows: 1. For a welding device for chain processing according to the present invention, by driving the extrusion strip to abut against both sides of the chain interface, heating the chain interface, and then driving the extrusion block to extrude both ends of the chain, so that the chain interfaces approach each other until the interface welding is completed. At the same time, the extrusion strip slides in the second rectangular frame through the first rectangular block and compresses the spring, so that the extrusion strip moves synchronously with the chain interface. After the welding is completed, the spring releases the elastic force to reset the rectangular support block, solving the problem that when the extrusion block extrudes the chain interface, friction may occur between the extrusion strip and the chain, resulting in a rough surface of the chain.

[0018] 2. For a welding device for chain processing according to the present invention, by arranging rectangular plates on both sides of the arc-shaped support block, the arc-shaped support block is used to support a section of the chain to be welded, one rectangular plate on one side is used to support the chain that has not been welded, and the rectangular plate on the other side is used to support the chain that has been welded. By adjusting the angles of the rectangular plates on both sides, both sides of a section of the chain to be welded located on the upper end of the arc-shaped support block can be completely exposed, facilitating the extrusion welding of both sides of the chain to be welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 is a perspective view of Embodiment 1 of the present invention; Figure 2 is a schematic diagram of the inside of the workbench; Figure 3It is a schematic diagram of the position of the arc support block; Figure 4 It is an exploded view inside the first rectangular frame; Figure 5 It is a schematic sectional view of the arc support block; Figure 6 It is a schematic diagram of the position of the rectangular plate; Figure 7 It is a schematic diagram of the position of the first cylindrical bar; Figure 8 It is a schematic diagram of the position of the second arc block; In the figure: 1. Workbench; 11. First rectangular frame; 111. Rectangular hole; 12. Rectangular support block; 121. Extrusion bar; 122. First rectangular block; 123. Second rectangular frame; 124. Spring; 125. Second rectangular block; 126. Bidirectional lead screw; 13. First rectangular bar; 131. Second rectangular bar; 132. Rectangular cylinder; 14. Base plate; 2. Arc support block; 21. Pusher block; 22. Extrusion block; 221. T-shaped block; 23. First arc block; 24. Second arc block; 241. Third rectangular bar; 242. Fourth rectangular bar; 243. Third rectangular block; 25. Rectangular plate; 251. Fourth rectangular block; 252. Fifth rectangular bar; 253. Sixth rectangular bar; 254. Waist-shaped block; 255. Seventh rectangular bar; 256. Eighth rectangular bar; 257. Lead screw; 258. Waist-shaped hole; 26. First cylindrical bar; 261. Second cylindrical bar; 262. Fifth rectangular block; 263. Third cylindrical bar; 264. Sixth rectangular block; 27. Support bar; 28. First support rod; 281. Second support rod. Specific embodiments

[0021] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: As Figures 1 - 4As shown in the figure, a welding device for chain processing according to an embodiment of the present invention includes two workbenches 1. The middle part of the workbench 1 is a hollow structure. An arc-shaped support block 2 is provided between the two workbenches 1. A welding assembly is provided at the upper end of the workbench 1. The welding assembly includes first rectangular frames 11 slidably provided at the upper ends of the workbench 1 respectively. Two rectangular support blocks 12 are slidably provided on opposite sides of the two first rectangular frames 11 respectively. Extrusion strips 121 are fixedly connected to opposite sides of the rectangular support blocks 12 respectively. First rectangular blocks 122 are fixedly connected to the sides of the rectangular support blocks 12 away from the extrusion strips 121 respectively. The first rectangular blocks 122 are slidably arranged inside second rectangular frames 123 respectively. The first rectangular blocks 122 are fixedly connected to one side inside the second rectangular frames 123 through springs 124. The second rectangular frames 123 are arranged inside the first rectangular frames 11. An extrusion assembly is provided at the upper end of the arc-shaped support block 2. The extrusion assembly includes two extrusion blocks 22. The extrusion blocks 22 are slid on the upper ends of the workbench 1 through T-shaped blocks 221 respectively.

[0023] Specifically, when processing the chain, after the chain is extruded into shape, it is necessary to weld each ring interface of the chain. Generally, resistance welding is used for welding. Resistance welding refers to a method of locally heating the workpiece by using the resistance heat generated by the current passing through the workpiece and the contact point, and at the same time applying pressure for welding; when welding the chain interface, place one ring of the chain on the upper end of the arc-shaped support block 2 so that the interface is located at the upper end. Then drive the first rectangular frames 11 to approach each other. Drive the extrusion strips 121 to approach both sides of the chain interface through the rectangular support blocks 12 until the interface is extruded. Then pass an electric current to heat the chain interface by the extrusion strips 121, melting the chain interface. The T-shaped blocks 221 are driven by electricity to control the two T-shaped blocks 221 on both sides to approach each other, driving the extrusion blocks 22 to extrude both ends of the middle part of the chain, making the chain interfaces approach each other until the interfaces are welded together. When the extrusion blocks 22 extrude both ends of the chain, the extrusion strips 121 slide in the second rectangular frames 123 through the first rectangular blocks 122 and compress the springs 124, so that the extrusion strips 121 move synchronously with the chain interface. By driving the extrusion strips 121 to abut against both sides of the chain interface, heat the chain interface. Then drive the extrusion blocks 22 to extrude both ends of the chain, making the chain interfaces approach each other until the welding is completed. At the same time, the extrusion strips 121 slide in the second rectangular frames 123 through the first rectangular blocks 122 and compress the springs 124, so that the extrusion strips 121 move synchronously with the chain interface. After welding, the springs 124 release elastic force to reset the rectangular support blocks 12, solving the problem that when the extrusion blocks 22 extrude the chain interface, the extrusion strips 121 may rub against the chain, resulting in a rough surface of the chain.

[0024] As Figure 4As shown, second rectangular blocks 125 are fixedly connected to the sides of the second rectangular frame 123 away from the rectangular support block 12. Two opposite second rectangular blocks 125 are respectively slidably arranged in the first rectangular frame 11. A bidirectional lead screw 126 is commonly threadedly connected to the middle parts of the two opposite second rectangular blocks 125. The bidirectional lead screw 126 is rotatably arranged inside the first rectangular frame 11.

[0025] Specifically, since the chain interfaces of chains of different sizes are different, by driving the bidirectional lead screw 126 to rotate, the two second rectangular blocks 125 are driven to slide inside the first rectangular frame 11. The second rectangular blocks 125 drive the two second rectangular frames 123 to move synchronously. The second rectangular frames 123 drive the two extrusion bars 121 to move synchronously through the rectangular support blocks 12. The distance between the extrusion bars 121 can be adjusted, and chains of different sizes can be welded at the interfaces.

[0026] As Figure 4 shown, rectangular holes 111 are respectively formed in the upper ends of the first rectangular frame 11. First rectangular bars 13 are fixedly connected to the upper ends of the second rectangular blocks 125. The first rectangular bars 13 are slidably arranged in the rectangular holes 111. Second rectangular bars 131 are fixedly connected to the upper ends of the first rectangular bars 13. The ends of the two opposite second rectangular bars 131 are commonly slidably arranged inside a rectangular cylinder 132.

[0027] Specifically, when driving the bidirectional lead screw 126 in one side of the first rectangular frame 11 to rotate to drive the second rectangular blocks 125 to move synchronously, the second rectangular blocks 125 drive the second rectangular bars 131 to move through the first rectangular bars 13. The second rectangular bars 131 drive the second rectangular blocks 125 inside the first rectangular frame 11 on the other side through the rectangular cylinder 132. The second rectangular blocks 125 on both sides can drive the extrusion bars 121 on both sides to move synchronously.

[0028] As Figure 8 shown, push blocks 21 respectively penetrate through both sides of the arc-shaped support block 2 in a sliding manner. The push blocks 21 are located at the bottom of the upper arc surface of the arc-shaped support block 2.

[0029] Specifically, when welding a chain, the chain is placed in the arc surface provided at the upper end of the arc-shaped support block 2. Subsequently, the two push blocks 21 on both sides are driven to slide towards the middle simultaneously. The push blocks 21 push the middle part of the chain to a vertical state, making the interface face upwards, which is convenient for subsequent welding.

[0030] As Figure 2 、 Figure 6 shown, a bottom plate 14 is fixedly connected to the lower end of the workbench 1. Rectangular plates 25 are respectively rotatably arranged on both sides of the arc-shaped support block 2. The lower end of the arc-shaped support block 2 is fixedly connected to the bottom plate 14 through a support bar 27.

[0031] Specifically, when welding the chain, it is necessary to continuously weld each joint of the chain. The arc-shaped support block 2 is used to support a section of the chain to be welded. The rectangular plate 25 on one side is used to support the unwelded chain, and the rectangular plate 25 on the other side is used to support the welded chain. By adjusting the angles of the two rectangular plates 25, the two sides of a section of the chain to be welded located at the upper end of the arc-shaped support block 2 can be completely exposed, facilitating the extrusion welding of both sides of the chain to be welded.

[0032] As Figure 5 shown, the two sides of the rectangular plate 25 are respectively rotatably connected with fourth rectangular blocks 251. The fourth rectangular blocks 251 are fixedly connected to the two sides of the arc-shaped support block 2. The two sides of the rectangular plate 25 are fixedly connected with pin shafts. The pin shafts rotatably penetrate through the fourth rectangular blocks 251 and are fixedly connected to fifth rectangular strips 252. The inner parts of the opposite ends of the two fifth rectangular strips 252 are respectively slidably provided with sixth rectangular strips 253. The opposite ends of the two sixth rectangular strips 253 are jointly rotatably connected with a kidney-shaped block 254. The lower ends of the kidney-shaped block 254 are respectively fixedly connected with seventh rectangular strips 255. The lower ends of the seventh rectangular strips 255 are jointly fixedly connected with an eighth rectangular strip 256. The eighth rectangular strip 256 is slidably arranged inside the lower end of the arc-shaped support block 2. The middle part of the eighth rectangular strip 256 is threadedly connected with a lead screw 257. The lead screw 257 is rotatably arranged at the lower end of the arc-shaped support block 2.

[0033] Specifically, by driving the lead screw 257 to rotate, the eighth rectangular strip 256 is driven to move upward. The eighth rectangular strip 256 drives the kidney-shaped block 254 to move upward through the seventh rectangular strip 255. When the kidney-shaped block 254 moves upward, it drives the two sides of the sixth rectangular strip 253 to rotate. When the sixth rectangular strip 253 rotates, it slides inside the fifth rectangular strip 252, and at the same time drives the fifth rectangular strip 252 to rotate. The fifth rectangular strip 252 drives the two sides of the rectangular plate 25 to rotate synchronously through the pin shaft. By adjusting the angle of the rectangular plate 25, the angle of the chain placed at the upper end of the rectangular plate 25 is adjusted. According to the chains of different sizes, the angle of the rectangular plate 25 is adjusted so that both ends of a section of the chain located at the upper end of the arc-shaped support block 2 can be completely exposed, facilitating the extrusion welding.

[0034] As Figure 7 shown, waist-shaped holes 258 are respectively arranged in the middle parts of the rectangular plates 25. First cylindrical strips 26 are slidably arranged inside the waist-shaped holes 258. The lower ends of the first cylindrical strips 26 are fixedly connected with second cylindrical strips 261. The two sides of the second cylindrical strips 261 are rotatably connected with fifth rectangular blocks 262. One side of each fifth rectangular block 262 is fixedly connected with a third cylindrical strip 263. The third cylindrical strip 263 is slidably arranged inside a sixth rectangular block 264. The sixth rectangular block 264 is fixedly connected to the lower end of the rectangular plate 25.

[0035] Specifically, when welding the chain, it is necessary to traction the welded chain and pull the welded chain into the water for cooling. Directly pulling the just-welded chain may cause deformation of the welding points. By driving the second cylindrical bar 261 to rotate between the fifth rectangular blocks 262, the first cylindrical bar 26 is driven to rotate. While the first cylindrical bar 26 rotates, it deflects the chain welded at the upper end of the rectangular plate 25 to one side, preventing the welding points of the chain from deforming when traction the welded chain.

[0036] As Figure 6 shown, the lower sides of the two ends of the rectangular plate 25 far from the arc support block 2 are respectively rotatably connected with first support bars 28. The lower ends of the first support bars 28 are slidably arranged inside the second support bars 281. The second support bars 281 are rotatably arranged on the upper end of the bottom plate 14.

[0037] Specifically, when driving the rectangular plate 25 to rotate, the first support bars 28 at the lower end are driven to rotate. When the first support bars 28 rotate, they slide inside the second support bars 281 and drive the second support bars 281 to rotate at the same time. The first support bars 28 and the second support bars 281 support the rectangular plate 25.

[0038] Embodiment 2: As Figure 8 shown, compared with Embodiment 1, another implementation manner of the present invention is: a first arc block 23 is slidably arranged in the middle of the upper end of the workbench 1 on one side, and two second arc blocks 24 are arranged on the upper end of the extrusion block 22 on one side.

[0039] Specifically, after the welding at the chain interface is completed, there will be protruding welding points at the welding place, which affect the beauty of the chain. By driving the first arc block 23 to slide towards the chain interface, the welding points on the upper and lower sides of the chain interface are scraped off. Subsequently, by driving the second arc blocks 24 to slide towards both sides of the chain interface, all the protruding welding points at the chain interface can be removed.

[0040] As Figure 8 shown, third rectangular bars 241 are respectively fixedly connected to the upper ends of the second arc blocks 24. Fourth rectangular bars 242 are respectively slidably connected to the upper ends of the third rectangular bars 241. The lower ends of the fourth rectangular bars 242 are slidably arranged on the upper end of the workbench 1 through third rectangular blocks 243.

[0041] Specifically, by driving the third rectangular bars 241 to slide at the lower ends of the fourth rectangular bars 242, the second arc blocks 24 on both sides are driven to slide towards the middle at the same time, so that the second arc blocks 24 are close to both sides of the chain welding points. Subsequently, by driving the third rectangular blocks 243 to slide on the upper end of the workbench 1, the second arc blocks 24 are driven to slide along the surface of the chain, and the welding bumps of the chain can be scraped off.

[0042] Working principle: when welding the chain interface, place one of the chain links on the upper end of the arc-shaped support block 2, and then drive the push blocks 21 on both sides to slide toward the middle at the same time. The push blocks 21 push the middle chain to a vertical state so that the interface faces upward, and then drive the first rectangular frame 11 to approach each other, and drive the extrusion bar 121 to approach both sides of the chain interface through the rectangular support block 12, until the interface is squeezed, and then current is passed to make the extrusion bar 121 heat the chain interface to melt the chain interface, and the T-shaped block 221 is driven by electricity to control the T-shaped blocks 221 on both sides to approach each other, drive the extrusion block 22 to squeeze the two ends of the middle chain, so that the chain interfaces are close to each other, until the interface The two ends of the chain are welded together. When the extrusion block 22 extrudes the two ends of the chain, the extrusion bar 121 slides in the second rectangular frame 123 through the first rectangular block 122 and squeezes the spring 124, so that the extrusion bar 121 and the chain interface move synchronously. The extrusion bar 121 is driven to abut against both sides of the chain interface to heat the chain interface. Then, the extrusion block 22 is driven to extrude the two ends of the chain so that the chain interfaces are close to each other until the interface welding is completed. At the same time, the extrusion bar 121 slides in the second rectangular frame 123 through the first rectangular block 122 and squeezes the spring 124, so that the extrusion bar 121 and the chain interface move synchronously. After the welding is completed, the spring releases the elastic force 124 to reset the rectangular support block 12. By driving the screw rod 257 to rotate, the eighth rectangular bar 256 is driven to move upward, and the eighth rectangular bar 256 drives the waist-shaped block 254 to move upward through the seventh rectangular bar 255. When the waist-shaped block 254 moves upward, it drives the sixth rectangular bar 253 on both sides to rotate. When the sixth rectangular bar 253 rotates, it slides in the fifth rectangular bar 252, and drives the fifth rectangular bar 252 to rotate at the same time. The fifth rectangular bar 252 drives the rectangular plates 25 on both sides to rotate synchronously through the pin shaft. The angle of the chain placed on the upper end of the rectangular plate 25 is adjusted by adjusting the angle of the rectangular plate 25. The angle of the rectangular plate 25 is adjusted according to the chains of different sizes, so that both ends of a chain section located at the upper end of the arc-shaped support block 2 can be fully exposed, which is convenient for extrusion welding; By driving the second cylindrical bar 261 to rotate between the fifth rectangular blocks 262, the first cylindrical bar 26 is driven to rotate. The first cylindrical bar 26 rotates and simultaneously moves the chain welded on the upper end of the rectangular plate 25 to one side, so as to prevent the welding point of the chain from being deformed when the welded chain is pulled; After the welding of the chain interface is completed, there will be protruding welding spots at the welding site, which affects the appearance of the chain. By driving the first arc block 23 to slide toward the chain interface, the welding spots on the upper and lower sides of the chain interface are scraped off, and then the second arc block 24 is driven to slide toward both sides of the chain interface, all the protruding welding spots at the chain interface can be removed.

[0043] 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 by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A welding device for chain processing, comprising two workbenches (1), the middle of the workbench (1) is a hollow structure, an arc-shaped support block (2) is arranged between the two workbenches (1), and a welding assembly is arranged at the upper end of the workbench (1), and the characteristics are as follows: The welding assembly includes first rectangular frames (11) respectively and slidably arranged at the upper end of a workbench (1). Two rectangular support blocks (12) are respectively and slidably arranged on opposite sides of the two first rectangular frames (11). Extrusion strips (121) are respectively fixedly connected to opposite sides of the rectangular support blocks (12). First rectangular blocks (122) are respectively fixedly connected to sides of the rectangular support blocks (12) away from the extrusion strips (121). The first rectangular blocks (122) are respectively slidably arranged inside second rectangular frames (123). The first rectangular blocks (122) are fixedly connected to one side inside the second rectangular frames (123) through springs (124). The second rectangular frames (123) are arranged inside the first rectangular frames (11). An extrusion assembly is arranged at the upper end of the arc-shaped support block (2). The extrusion assembly includes two extrusion blocks (22). The extrusion blocks (22) are respectively slid on the upper end of the workbench (1) through T-shaped blocks (221).

2. The welding device for chain processing according to claim 1, characterized in that: Second rectangular blocks (125) are respectively fixedly connected to sides of the second rectangular frames (123) away from the rectangular support blocks (12). Two opposite second rectangular blocks (125) are respectively slidably arranged inside the first rectangular frame (11). A bidirectional lead screw (126) is commonly and threadedly connected to the middle of the two opposite second rectangular blocks (125). The bidirectional lead screw (126) is rotatably arranged inside the first rectangular frame (11).

3. A welding device for chain processing according to claim 2, characterized in that: Rectangular holes (111) are respectively formed at the upper ends of the first rectangular frames (11). First rectangular strips (13) are respectively fixedly connected to the upper ends of the second rectangular blocks (125). The first rectangular strips (13) are slidably arranged inside the rectangular holes (111). Second rectangular strips (131) are respectively fixedly connected to the upper ends of the first rectangular strips (13). The ends of two opposite second rectangular strips (131) are commonly and slidably arranged inside a rectangular cylinder (132).

4. A welding device for chain processing according to claim 3, characterized in that: Push blocks (21) respectively and slidably penetrate through two sides of the arc-shaped support block (2). The push blocks (21) are located at the bottom end of the upper arc surface of the arc-shaped support block (2).

5. A welding device for chain processing according to claim 4, characterized in that: A bottom plate (14) is fixedly connected to the lower end of the workbench (1). Rectangular plates (25) are respectively rotatably arranged on two sides of the arc-shaped support block (2). The lower end of the arc-shaped support block (2) is fixedly connected to the bottom plate (14) through a support strip (27).

6. The welding device for chain processing according to claim 5, wherein: On both sides of the rectangular plate (25), there are fourth rectangular blocks (251) rotatably connected respectively. The fourth rectangular blocks (251) are fixedly connected to both sides of the arc-shaped support block (2). On both sides of the rectangular plate (25), there are pin shafts fixedly connected. The pin shafts rotatably penetrate through the fourth rectangular blocks (251) and are fixedly connected to the fifth rectangular strips (252). Inside the opposite ends of the two fifth rectangular strips (252), there are sixth rectangular strips (253) slidably arranged respectively. At the opposite ends of the two sixth rectangular strips (253), there is a kidney-shaped block (254) rotatably connected. At the lower ends of the kidney-shaped block (254), there are seventh rectangular strips (255) fixedly connected respectively. At the lower ends of the seventh rectangular strips (255), there is an eighth rectangular strip (256) fixedly connected. The eighth rectangular strip (256) is slidably arranged inside the lower end of the arc-shaped support block (2). In the middle of the eighth rectangular strip (256), there is a lead screw (257) threadedly connected. The lead screw (257) is rotatably arranged at the lower end of the arc-shaped support block (2).

7. A welding device for chain processing according to claim 6, characterized in that: In the middle of the rectangular plate (25), there are kidney-shaped holes (258). Inside the kidney-shaped holes (258), there is a first cylindrical strip (26) slidably arranged. At the lower end of the first cylindrical strip (26), there is a second cylindrical strip (261) fixedly connected. On both sides of the second cylindrical strip (261), there are fifth rectangular blocks (262) rotatably connected. On one side of the fifth rectangular blocks (262), there are third cylindrical strips (263) fixedly connected respectively. The third cylindrical strips (263) are slidably arranged inside the sixth rectangular blocks (264). The sixth rectangular blocks (264) are fixedly connected to the lower end of the rectangular plate (25).

8. A welding device for chain processing according to claim 7, characterized in that: At the lower side of the end of the rectangular plate (25) away from the arc-shaped support block (2), there are first support rods (28) rotatably connected respectively. At the lower ends of the first support rods (28), there are second support rods (281) slidably arranged. The second support rods (281) are rotatably arranged at the upper end of the bottom plate (14).

9. A welding device for chain processing according to claim 1, characterized in that: On the upper end of the workbench (1) on one side, there is a first arc-shaped block (23) slidably arranged. On the upper end of the extrusion block (22) on one side, there are two second arc-shaped blocks (24).

10. A welding device for chain processing according to claim 9, characterized in that: On the upper ends of the second arc-shaped blocks (24), there are third rectangular strips (241) fixedly connected respectively. On the upper ends of the third rectangular strips (241), there are fourth rectangular strips (242) slidably connected respectively. The lower ends of the fourth rectangular strips (242) are slidably arranged on the upper end of the workbench (1) through the third rectangular blocks (243).

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