CNC welding device for automobile body sheet metal parts

Abstract

The present invention is a CNC welding device for sheet metal parts of automobile bodies, comprising: a box body, a transmission box is arranged above the box body, a first U-shaped groove is arranged on the outer wall of the transmission box, one end of an L-shaped connecting rod passes through the first U-shaped groove and extends into the transmission box, the other end of the L-shaped connecting rod is connected to a welding head, two through holes are arranged at intervals on the top of the box body, a cleaning brush is arranged below the through holes in the box body, a welding head driving assembly is arranged in the transmission box, the welding head driving assembly is connected to one end of the L-shaped connecting rod extending into the transmission box, and drives the welding head to move along a U-shaped track, a cleaning brush driving assembly is arranged in the box body, and the cleaning brush driving assembly drives the cleaning brush to rotate alternately in forward and reverse directions. The welding head can weld the weld seams of two sheet metal parts, and after welding, it contacts the cleaning brush, thereby cleaning the surface of the welding head, removing welding slag or debris, keeping the welding head clean, improving the stability of each welding, and improving the welding accuracy and strength of the sheet metal parts.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a numerical control welding device for automobile body sheet metal parts. Background Art

[0002] Sheet metal is a product processed by sheet metal technology. Sheet metal is a comprehensive cold processing process for thin metal plates, including shearing, punching / cutting / compounding, folding, welding, riveting, splicing, forming and other operations. Its notable feature is that the thickness of the same part is consistent. Specifically, sheet metal parts are usually made of materials such as thin steel plates, aluminum plates or stainless steel plates, and can be processed into various shapes and sizes through processes such as stamping, bending, stretching and welding to meet different uses and requirements. The application of these processes enables sheet metal parts to meet various different needs and also improve production efficiency. Sheet metal parts have many advantages, such as light weight, high strength, electrical conductivity, low cost, and good performance in large-scale mass production. They are widely used in industries such as automobiles, aerospace, electronics, home appliances, and construction as structural parts, functional parts or decorative parts. Especially in the automotive industry, sheet metal parts are widely used, such as body shells, doors, roofs, floor panels and other parts.

[0003] With the development of the automobile industry, the welding technology of automobile body sheet metal parts has occupied an important position in the automobile manufacturing process. Carbon dioxide gas shielded welding is an efficient and low-cost welding method. It achieves metal connection by applying carbon dioxide gas around the welding area to protect the welding process. This method has the advantages of fast welding speed, deep penetration, high weld quality and small deformation. Therefore, it is widely used in industrial fields such as automobiles, machinery, construction, and shipbuilding. Carbon dioxide shielded welding uses the arc generated between the welding wire and the workpiece to melt the metal. CO2 is used as the shielding gas and the welding wire is used as the filler metal. During the welding process, the high-temperature arc generated by the electrode melts the base material and the filler wire to form a molten pool. The arc uses the protective effect of carbon dioxide gas to isolate the arc, molten pool and molten droplets from the air to achieve stable welding. Since impure shielding gas or improper operation may cause welding defects such as pores, slag inclusions, and unfused, in practical applications, it is necessary to strictly control the welding parameters to ensure the welding quality. Traditional carbon dioxide shielded welding often requires manual placement of sheet metal parts, and the welding head needs to be cleaned after each welding. Not only is the welding efficiency low, but the welding quality is easily affected by human factors, resulting in the inability to guarantee the accuracy and strength of the welded parts. Summary of the invention

[0004] Therefore, the present invention aims to solve the problem that the sheet metal parts need to be placed manually in the prior art and the welding head needs to be cleaned after each welding. Not only is the welding efficiency low, but the welding quality is easily affected by human factors, resulting in the problem that the accuracy and strength of the welded parts cannot be guaranteed.

[0005] To this end, the technical solution adopted is that a CNC welding device for automobile body sheet metal parts of the present invention comprises: a box body, a transmission box is arranged above the box body, the transmission box and the box body are connected by a support plate, a first U-shaped groove is arranged on the outer wall of the transmission box, one end of the L-shaped connecting rod passes through the first U-shaped groove and extends into the transmission box, the other end of the L-shaped connecting rod is connected to the welding head, two through holes are arranged at intervals on the top of the box body, the through holes are located below the first U-shaped groove, a cleaning brush is arranged in the box body below the through holes, a welding head driving assembly is arranged in the transmission box, the welding head driving assembly is connected to one end of the L-shaped connecting rod extending into the transmission box, and drives the welding head to move along the U-shaped track, a cleaning brush driving assembly is arranged in the box body, the welding head driving assembly is connected to the cleaning brush driving assembly, the welding head driving assembly drives the cleaning brush driving assembly to move, and the cleaning brush driving assembly drives the cleaning brush to rotate alternately in forward and reverse directions.

[0006] Preferably, the welding head driving assembly includes: a first motor, a first motor is arranged on the inner wall of the transmission box, the output shaft of the first motor is coaxially connected to one end of the first rotating shaft, the other end of the first rotating shaft is connected to one end of the first crank, a horizontal slide body is arranged on the right side of the first motor, the slide body is connected to the inner wall of the transmission box, a second U-shaped groove is arranged on the slide body, a slider is slidably connected in the second U-shaped groove, a slide plate is slidably connected in the slide body, a V-shaped groove is arranged on the slide plate, an end of the L-shaped connecting rod away from the welding head passes through the V-shaped groove and is connected to the slider, the other end of the first crank is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is hinged to the left end of the slide plate.

[0007] Preferably, a cleaning brush driving assembly includes: a first pulley, a first pulley is coaxially arranged on the first rotating shaft, the inner wall of the casing is rotatably connected to one end of the second rotating shaft, a second pulley is coaxially arranged on the second rotating shaft, the first pulley is connected to the second pulley through a belt, a channel for the belt to pass is provided on the support plate, the other end of the second rotating shaft is connected to one end of the second crank, the other end of the second crank is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is hinged to the left end of the rack, the rack is slidably connected to the slide rail, the slide rail is connected to the inner wall of the casing through the first connecting rod, the rack meshes with the gear, the gear is connected to one end of the gear shaft, the other end of the gear shaft is connected to the cleaning brush, the gear shaft passes through the fixed block and is rotatably connected to the fixed block, and the fixed block is connected to the inner wall of the casing through the second connecting rod.

[0008] Preferably, an automatic feeding device is provided on the box body, and the automatic feeding device comprises: a material box, a material box is provided on the top of the box body, sheet metal parts are stacked in the material box, an opening is provided on the top of the box body, the opening is connected to the material box, a groove is provided on the left side of the material box, and a discharge port is provided on the right side of the material box, four sprockets distributed in a rectangular shape are provided in the box body, a second motor is provided on the inner wall of the box body, the second motor output shaft is connected to one of the sprockets, and the remaining sprockets are rotatably connected to the inner wall of the box body, and the four sprockets are connected by chains, and vertical fixed rods are respectively provided on both sides of the chain, and both ends of the fixed rod are connected to the support block, and the support block is connected to the inner wall of the box body, and a sleeve is slidably connected to the fixed rod, and the two sleeves are connected by a movable plate, and a guide groove extending along the length direction is provided on the movable plate, and a translation block is slidably connected to the guide groove, and a shift rod is provided on the top of the translation block, one end of the connecting shaft is rotatably connected to the translation block, and the other end of the connecting shaft is connected to the chain.

[0009] Preferably, a cover plate is provided at the top of the material box, and one end of the cover plate is hinged to the material box.

[0010] Preferably, a slag discharge port is provided at the bottom end of the box body below the cleaning brush.

[0011] Preferably, a discharge port is provided on the support plate, and a guide plate is provided on the top of the box body at the right side of the discharge port.

[0012] Preferably, four support rods are provided at the bottom end of the box.

[0013] The technical solution of the present invention has the following advantages:

[0014] 1. When the welding head moves back and forth in the horizontal direction, the welds of the two sheet metal parts can be welded. When the welding head moves in the vertical direction, it will pass through the through hole and contact the cleaning brush that rotates alternately in forward and reverse directions, thereby cleaning the surface of the welding head and removing welding slag or debris, so that the welding head can be kept clean during the next welding, improving the stability of each welding and improving the welding accuracy and strength of the sheet metal parts.

[0015] 2. Every time the translation block moves along the rectangular track, the lever will pass through the opening and groove and move to the right, pushing a group of sheet metal parts at the bottom of the material box to the welding head for welding, thereby realizing intermittent automatic feeding of sheet metal parts, realizing automatic welding, and improving welding efficiency.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is an AA cross-sectional view of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the transmission box;

[0022] Figure 4 It is a structural schematic diagram of the chute body in the present invention;

[0023] Figure 5 It is a structural schematic diagram of a slider, an L-shaped connecting rod and a welding head in the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the groove in the present invention;

[0025] Figure 7 It is a structural schematic diagram of the discharge port in the present invention;

[0026] Description of reference numerals:

[0027] 1. Box body; 2. Transmission box; 3. Support plate; 4. First U-shaped groove; 5. L-shaped connecting rod; 6. Welding head; 7. Through hole; 8. Cleaning brush; 9. First motor; 10. First rotating shaft; 11. First crank; 12. Slide trough body; 13. Second U-shaped groove; 14. Slider; 15. Slide plate; 16. V-shaped groove; 17. First connecting rod; 18. First pulley; 19. Second rotating shaft; 20. Second pulley; 21. Belt; 22. Second crank; 23. Second connecting rod; 24. Rack; 25. Slide rail; 2 6. First connecting rod; 27. Gear; 28. Gear shaft; 29. ​​Fixed block; 30. Second connecting rod; 31. Material box; 32. Sheet metal; 33. Opening; 34. Groove; 35. Discharge port; 36. Sprocket; 37. Second motor; 38. Chain; 39. Fixed rod; 40. Support block; 41. Sleeve; 42. Moving plate; 43. Guide groove; 44. Translation block; 45. Push rod; 46. Connecting shaft; 47. Cover plate; 48. Slag discharge port; 49. Discharge port; 50. Guide plate; 51. Support rod. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0030] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] Embodiment 1

[0033] The present invention provides a numerical control welding device for automobile body sheet metal parts, such as Figure 1-7 As shown, it includes: a box body 1, a transmission box 2 is arranged above the box body 1, the transmission box 2 is connected to the box body 1 through a support plate 3, a first U-shaped groove 4 is arranged on the outer wall of the transmission box 2, one end of an L-shaped connecting rod 5 passes through the first U-shaped groove 4 and extends into the transmission box 2, and the other end of the L-shaped connecting rod 5 is connected to a welding head 6, two through holes 7 are arranged at intervals on the top of the box body 1, the through hole 7 is located below the first U-shaped groove 4, a cleaning brush 8 is arranged below the through hole 7 in the box body 1, a welding head driving assembly is arranged in the transmission box 2, the welding head driving assembly is connected to one end of the L-shaped connecting rod 5 extending into the transmission box 2, and drives the welding head 6 to move along the U-shaped track, a cleaning brush driving assembly is arranged in the box body 1, the welding head driving assembly is connected to the cleaning brush driving assembly, the welding head driving assembly drives the cleaning brush driving assembly to move, and the cleaning brush driving assembly drives the cleaning brush 8 to rotate alternately in forward and reverse directions.

[0034] The welding head driving assembly includes: a first motor 9, a first motor 9 is arranged on the inner wall of the transmission box 2, the output shaft of the first motor 9 is coaxially connected with one end of the first rotating shaft 10, the other end of the first rotating shaft 10 is connected with one end of the first crank 11, a horizontal slide trough body 12 is arranged on the right side of the first motor 9, the slide trough body 12 is connected to the inner wall of the transmission box 2, a second U-shaped groove 13 is arranged on the slide trough body 12, a slider 14 is slidably connected in the second U-shaped groove 13, a slide plate 15 is slidably connected in the slide trough body 12, a V-shaped groove 16 is arranged on the slide plate 15, one end of the L-shaped connecting rod 5 away from the welding head 6 passes through the V-shaped groove 16 and is connected to the slider 14, the other end of the first crank 11 is rotatably connected to one end of the first connecting rod 17, and the other end of the first connecting rod 17 is hinged to the left end of the slide plate 15.

[0035] The cleaning brush driving assembly includes: a first pulley 18, a first pulley 18 is coaxially arranged on the first rotating shaft 10, the inner wall of the box body 1 is rotatably connected to one end of the second rotating shaft 19, a second pulley 20 is coaxially arranged on the second rotating shaft 19, the first pulley 18 and the second pulley 20 are connected by a belt 21, a channel through which the belt 21 passes is provided on the support plate 3, the other end of the second rotating shaft 19 is connected to one end of the second crank 22, the other end of the second crank 22 is rotatably connected to one end of the second connecting rod 23, the other end of the second connecting rod 23 is hinged to the left end of the rack 24, the rack 24 is slidably connected to the slide rail 25, the slide rail 25 is connected to the inner wall of the box body 1 through the first connecting rod 26, the rack 24 is meshed with the gear 27, the gear 27 is connected to one end of the gear shaft 28, the other end of the gear shaft 28 is connected to the cleaning brush 8, the gear shaft 28 passes through the fixed block 29, and is rotatably connected to the fixed block 29, and the fixed block 29 is connected to the inner wall of the box body 1 through the second connecting rod 30.

[0036] The working principle and beneficial technical effects of the above technical solution are as follows: two sheet metal parts 35 to be welded are placed under the welding head 6, and the first motor 9 is started to drive the first rotating shaft 10 and the first crank 11 to rotate. The first crank 11, the first connecting rod 17 and the slide plate 15 form a crank slider mechanism, which drives the slide plate 15 to reciprocate left and right along the slide trough body 12, and the slide trough body 12 drives the L-shaped connecting rod 5 and the slide block 14 to move left and right. When the slide block 14 moves to the extreme position in the horizontal direction, the L-shaped connecting rod 5 is slidably matched with the V-shaped groove 16, so that the L-shaped connecting rod 5 moves in the vertical direction, so that the L-shaped connecting rod 5 and the slide block 14 move cyclically along the trajectory of the first U-shaped groove 4, driving the welding head 6 to move cyclically along the U-shaped trajectory; at the same time, the first rotating shaft 10 drives the first connecting rod 17 and the slide block 15 to move cyclically along the U-shaped trajectory. A pulley 18 rotates, and the belt 21 is used to transmit the power, thereby driving the second pulley 20, the second rotating shaft 19 and the second crank 22 to rotate. The second crank 22, the second connecting rod 23 and the rack 24 form a crank slider structure, so that the rack 24 reciprocates left and right along the slide rail 25. The rack 24 is engaged with the gear 27, driving the gear 27 and the cleaning brush 8 to rotate alternately in forward and reverse directions. When the welding head 6 reciprocates in the horizontal direction, the welds of the two sheet metal parts can be welded. When the welding head 6 moves in the vertical direction, it will pass through the through hole 7 and contact the cleaning brush 8 that rotates alternately in forward and reverse directions, thereby cleaning the surface of the welding head and removing welding slag or debris, so that the welding head can be kept clean during the next welding, the stability of each welding is improved, and the welding accuracy and strength of the sheet metal parts are improved.

[0037] Embodiment 2

[0038] In one embodiment, Figure 1-7As shown, the box body 1 is provided with an automatic feeding device, which includes: a material box 31, a material box 31 is provided at the top of the box body 1, sheet metal parts 32 are stacked in the material box 31, an opening 33 is provided at the top of the box body 1, the opening 33 is communicated with the material box 31, a groove 34 is provided on the left side of the material box 31, and a discharge port 35 is provided on the right side of the material box 31. Four sprocket wheels 36 distributed in a rectangular shape are provided in the box body 1, and a second motor 37 is provided on the inner wall of the box body 1. The output shaft of the second motor 37 is connected to one of the sprocket wheels 36, and the remaining sprocket wheels 36 are rotatably connected to the inner wall of the box body 1. The four sprockets 36 are connected by a chain 38. A vertical fixed rod 39 is provided on both sides of the chain 38. The two ends of the fixed rod 39 are connected to the support block 40. The support block 40 is connected to the inner wall of the box body 1. A sleeve 41 is slidably connected to the fixed rod 39. The two sleeves 41 are connected by a moving plate 42. The moving plate 42 is provided with a guide groove 43 extending along the length direction. The guide groove 43 is slidably connected to a translation block 44. A lever 45 is provided at the top of the translation block 44. One end of the connecting shaft 46 is rotatably connected to the translation block 44, and the other end of the connecting shaft 46 is connected to the chain 38. A cover plate 47 is provided at the top of the material box 31. One end of the cover plate 47 is hinged to the material box 31. The cover plate 47 protects the sheet metal parts stored in the material box 31 to prevent dust or foreign matter from entering and affecting the welding quality. A slag discharge port 48 is provided at the bottom of the box body 1 below the cleaning brush 8 to discharge the cleaned welding slag. The support plate 3 is provided with a discharge port 49, and a guide plate 50 is provided at the top of the box body 1 on the right side of the discharge port 49. The welded sheet metal parts are discharged from the discharge port 49 and then slide out from the guide plate 50. Four support rods 51 are provided at the bottom of the box body 1 to support the box body 1.

[0039] The working principle and beneficial technical effects of the above technical solution are as follows: the second motor 37 is started to drive the sprocket 36 to rotate, and the chain 38 is driven by the four sprockets 36 and the chain 38 to move along the rectangular trajectory. Since the sleeve 41 can move in the vertical direction of the fixed rod 39 and the translation block 44 can move in the horizontal direction of the guide groove 43, the chain 38 drives the translation block 44 and the lever 45 to move along the rectangular trajectory. Every time the translation block 44 moves one circle along the rectangular trajectory, the lever 45 will pass through the opening 33 and the groove 34 and move to the right, pushing a group of sheet metal parts at the bottom of the material box 31 to the welding head 6 for welding, thereby realizing intermittent automatic feeding of sheet metal parts, realizing automatic welding, and improving welding efficiency.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A CNC welding device for automobile body sheet metal parts, characterized in that: include: A box body (1), a transmission box (2) is arranged above the box body (1), the transmission box (2) and the box body (1) are connected via a support plate (3), a first U-shaped groove (4) is arranged on the outer wall of the transmission box (2), one end of an L-shaped connecting rod (5) passes through the first U-shaped groove (4) and extends into the transmission box (2), the other end of the L-shaped connecting rod (5) is connected to a welding head (6), two through holes (7) are arranged at intervals on the top of the box body (1), the through holes (7) are located below the first U-shaped groove (4), and the box body (1) is provided with a plurality of through holes (7). A cleaning brush (8) is arranged below the through hole (7); a welding head driving assembly is arranged in the transmission box (2); the welding head driving assembly is connected to one end of the L-shaped connecting rod (5) extending into the transmission box (2), and drives the welding head (6) to move along the U-shaped track; a cleaning brush driving assembly is arranged in the box body (1); the welding head driving assembly is connected to the cleaning brush driving assembly; the welding head driving assembly drives the cleaning brush driving assembly to move; and the cleaning brush driving assembly drives the cleaning brush (8) to rotate alternately in forward and reverse directions; The welding head driving assembly comprises: a first motor (9), the first motor (9) is arranged on the inner wall of the transmission box (2), the output shaft of the first motor (9) is coaxially connected to one end of the first rotating shaft (10), the other end of the first rotating shaft (10) is connected to one end of the first crank (11), a horizontal chute body (12) is arranged on the right side of the first motor (9), the chute body (12) is connected to the inner wall of the transmission box (2), a second U-shaped groove (13) is arranged on the chute body (12), a slider (14) is slidably connected in the second U-shaped groove (13), a slide plate (15) is slidably connected in the chute body (12), a V-shaped groove (16) is arranged on the slide plate (15), one end of the L-shaped connecting rod (5) away from the welding head (6) passes through the V-shaped groove (16) and is connected to the slider (14), the other end of the first crank (11) is rotatably connected to one end of the first connecting rod (17), and the other end of the first connecting rod (17) is hinged to the left end of the slide plate (15); The cleaning brush driving assembly comprises: a first pulley (18), the first rotating shaft (10) is coaxially provided with the first pulley (18), the inner wall of the housing (1) is rotatably connected to one end of the second rotating shaft (19), the second rotating shaft (19) is coaxially provided with a second pulley (20), the first pulley (18) and the second pulley (20) are connected via a belt (21), the support plate (3) is provided with a channel through which the belt (21) passes, the other end of the second rotating shaft (19) is connected to one end of a second crank (22), the other end of the second crank (22) is connected to a second connecting rod (23), The rack (24) is slidably connected to the slide rail (25), the slide rail (25) is connected to the inner wall of the box body (1) through a first connecting rod (26), the rack (24) is meshed with a gear (27), the gear (27) is connected to one end of a gear shaft (28), the other end of the gear shaft (28) is connected to a cleaning brush (8), the gear shaft (28) passes through a fixed block (29) and is rotatably connected to the fixed block (29), and the fixed block (29) is connected to the inner wall of the box body (1) through a second connecting rod (30).

2. The CNC welding device for automobile body sheet metal parts according to claim 1, characterized in that: An automatic feeding device is provided on the box body (1), and the automatic feeding device comprises: a material box (31), a material box (31) is provided at the top of the box body (1), sheet metal parts (32) are stacked in the material box (31), an opening (33) is provided at the top of the box body (1), the opening (33) is communicated with the material box (31), a groove (34) is provided on the left side of the material box (31), and a discharge port (35) is provided on the right side of the material box (31), four sprocket wheels (36) distributed in a rectangular shape are provided in the box body (1), a second motor (37) is provided on the inner wall of the box body (1), an output shaft of the second motor (37) is connected to one of the sprocket wheels (36), and the remaining sprocket wheels (36) are rotatably connected to the inner wall of the box body (1), and the four The sprockets (36) are connected by a chain (38), and fixed rods (39) are respectively arranged on both sides of the chain (38) in a vertical direction. The two ends of the fixed rod (39) are connected to a support block (40), and the support block (40) is connected to the inner wall of the box body (1). A sleeve (41) is slidably connected to the fixed rod (39), and the two sleeves (41) are connected by a movable plate (42). The movable plate (42) is provided with a guide groove (43) extending in the length direction, and a translation block (44) is slidably connected to the guide groove (43). A shifting rod (45) is arranged at the top of the translation block (44), and one end of a connecting shaft (46) is rotatably connected to the translation block (44), and the other end of the connecting shaft (46) is connected to the chain (38).

3. A CNC welding device for automobile body sheet metal parts according to claim 2, characterized in that: A cover plate (47) is provided at the top of the material box (31), and one end of the cover plate (47) is hinged to the material box (31).

4. The CNC welding device for automobile body sheet metal parts according to claim 1, characterized in that: A slag discharge port (48) is provided at the bottom end of the box body (1) below the cleaning brush (8).

5. The CNC welding device for automobile body sheet metal parts according to claim 1, characterized in that: A material discharge port (49) is provided on the support plate (3), and a material guide plate (50) is provided on the top end of the box body (1) and located on the right side of the material discharge port (49).

6. The CNC welding device for automobile body sheet metal parts according to claim 1, characterized in that: Four support rods (51) are arranged at the bottom end of the box body (1).

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