Workpiece turnover device of welding machine

Abstract

The invention belongs to the technical field of workpiece fixing, and discloses a workpiece turnover device of a welding machine, the workpiece turnover device comprises a welding turnover machine base assembly and a tubular workpiece, the welding turnover machine base assembly comprises a mounting seat, an L-shaped arm frame and an annular walking arm are fixedly arranged on the mounting seat, a driving motor is fixedly arranged on the L-shaped arm frame, and the annular walking arm is fixedly arranged on the driving motor. A transposition shaft is arranged on an output shaft of the driving motor, a transposition arm is fixedly arranged at the end, away from the driving motor, of the transposition shaft, and turnover arm assemblies are rotationally arranged at the two ends of the transposition arm correspondingly. The overturning arm assembly rotates synchronously, in the rotating process of the overturning arm assembly, annular cleaning and rotating cleaning of the multiple cleaning brush rods on the follow-up cleaning arm assembly on the outer wall of the tubular workpiece are achieved, and subsequent pseudo soldering is avoided through double-layer cleaning.

Description

Technical Field

[0001] The present invention belongs to the technical field of workpiece fixing, and particularly relates to a workpiece turnover device for a welding machine. Background Art

[0002] In the welding of the outer surface of circular pipe fittings, on the one hand, the circular pipe fittings need to be turned over during welding. Because after welding the top surface of the circular pipe fittings, only by turning over can the bottom surface of the circular pipe fittings be completely exposed. This results in the inability to weld the top and bottom surfaces of the circular pipe fittings simultaneously, leading to a long welding cycle. At the same time, when turning over the outer surface of the circular pipe fittings, floating dust or welding chips may adhere to the outer surface of the circular pipe fittings. Without necessary outer surface cleaning, it will cause subsequent false welding on the outer surface of the circular pipe fittings. Therefore, it is urgent to solve the above problems. Summary of the Invention

[0003] To solve the problem of not being able to weld the top and bottom surfaces simultaneously as mentioned in the above background art, the present invention provides a workpiece turnover device for a welding machine, which has the characteristics of double-sided double-station welding and follow-up cleaning.

[0004] To achieve the above object, the present invention provides the following technical solution: A workpiece turnover device for a welding machine, including a welding turnover machine base assembly and a tubular workpiece. The welding turnover machine base assembly includes a mounting base, on which an L-shaped arm frame and a ring walking arm are fixedly arranged. A driving motor is fixedly arranged on the L-shaped arm frame. A transposition shaft is arranged on the output shaft of the driving motor. A transposition arm is fixedly arranged at the end of the transposition shaft away from the driving motor. Two turning arm assemblies are rotatably arranged at both ends of the transposition arm. The two turning arm assemblies form a double-station turning arm structure at both ends of the transposition arm to expose the top and bottom surfaces of the tubular workpiece respectively. A support arm assembly and a follow-up cleaning arm assembly are respectively arranged inside and outside the turning arm assembly. The two turning arm assemblies form a 180-degree rotation and transposition structure at both ends of the transposition arm. During this process, the tubular workpieces on the two turning arm assemblies form a 180-degree turning and surface-changing structure. At the same time, the follow-up cleaning arm assembly forms a follow-up outer pipe wall cleaning structure outside the tubular workpiece. The tubular workpiece forms a fixed-point release and inner support fixing structure on the turning arm assembly through the support arm assembly.

[0005] In a preferred embodiment of a workpiece turnover device for a welding machine, release grooves are respectively opened at the top and bottom of the arm body on the side of the ring walking arm away from the mounting base. A fixed rod is fixedly arranged on the frame of the L-shaped arm frame on the side away from the driving motor. Two grooved pulleys are fixedly arranged at the end of the fixed rod away from the L-shaped arm frame, and a belt is arranged on the grooved pulley.

[0006] In a preferred embodiment of the workpiece turning device of a welding machine, the turning arm assembly includes a turning arm. At one end of the turning arm, two driving pulleys are fixedly arranged, and at the other end of the turning arm, a plurality of limiting chutes and a plurality of end ears are provided.

[0007] In a preferred embodiment of the workpiece turning device of a welding machine, the support arm assembly includes a support arm. At one end of the support arm, a roller is fixedly arranged, and at the other end of the support arm, a plurality of side end ears are fixedly arranged. A support support arm is rotatably arranged on the top of the side end ears. A support roller is rotatably arranged on the top of the support support arm, and a linkage arm is rotatably arranged in the middle of the support support arm. A top spring is fixedly arranged on the bottom end face of the roller.

[0008] In a preferred embodiment of the workpiece turning device of a welding machine, the follower cleaning arm assembly includes a cleaning circular platform, a cleaning internal gear, and a cleaning limiting tooth ring. A plurality of cleaning support arms are fixedly arranged at the bottom of the cleaning circular platform. A cleaning brush rod is rotatably arranged at one end of the cleaning support arm away from the cleaning circular platform. A cleaning follower gear is fixedly arranged at one end of the cleaning brush rod. The cleaning circular platform, the cleaning internal gear, and the cleaning limiting tooth ring are coaxially arranged. A cleaning fixing plate is fixedly arranged at the rear side of the cleaning limiting tooth ring.

[0009] In a preferred embodiment of the workpiece turning device of a welding machine, the turning arm is rotatably arranged at the end of the transposition arm through a bearing. The driving pulley is arranged at the rear side of the transposition arm. The belt is sleeved between the grooved pulley and the driving pulley. The diameter of the grooved pulley is twice that of the driving pulley.

[0010] In a preferred embodiment of the workpiece turning device of a welding machine, the support arm slides horizontally back and forth within the turning arm. The side end ears slide horizontally back and forth within the limiting chutes. One end of the linkage arm away from the support support arm is rotatably arranged on the limiting chute.

[0011] In a preferred embodiment of the workpiece turning device of a welding machine, both ends of the top spring respectively abut against the outer side surfaces of the roller and the driving pulley. Through the abutting of the top spring, the roller makes a circular motion and abuts against the outer side surface of the circular walking arm.

[0012] In a preferred embodiment of the workpiece turning device of a welding machine, the cleaning limiting tooth ring is fixed on the outer side surface of the transposition arm through the cleaning fixing plate. The cleaning internal gear is fixed on the turning arm. The cleaning circular platform is rotatably arranged on the turning arm through a bearing.

[0013] In a preferred embodiment of the workpiece turning device of a welding machine, the cleaning follower gear is arranged between the cleaning internal gear and the cleaning limiting tooth ring, and both sides of the cleaning follower gear are respectively meshed with the outer side of the cleaning internal gear and the inner side of the cleaning limiting tooth ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, two flipping arm assemblies form a double-station structure on the transposition arm. At this time, the top surface of the workpiece is exposed. During the 180-degree rotation of the transposition arm, the two workpieces on the double stations are subjected to 180-degree flipping and surface conversion during the 180-degree transposition process, so that the top surface and the bottom surface of the workpiece are flipped and interchanged, thereby exposing both the top surface and the bottom surface of the tubular workpiece, which is convenient for subsequent welding processing. During the 180-degree rotation of the transposition arm in the present invention, the flipping arm assemblies rotate synchronously. During the rotation of the flipping arm assemblies, multiple cleaning brush rods on the follow-up cleaning arm assembly perform circular cleaning and self-rotation cleaning on the outer wall of the tubular workpiece. Through this double-layer cleaning, the welding chips and dust on the outer wall of the tubular workpiece are cleaned off, avoiding subsequent false soldering. Moreover, this cleaning occurs in a follow-up manner and is synchronized with the flipping action, resulting in a high degree of coordination between flipping and cleaning. 3. In the present invention, the tubular workpiece is internally supported and fixed on the flipping arm assembly through the support arm assembly. The support arm assembly moves circularly on the circular walking arm. When the support arm assembly moves circularly at the protruding part of the circular walking arm, at this time, the tubular workpiece forms a constant internal support and fixing structure on the flipping arm assembly through the support arm assembly. In this way, it is convenient for the flipping of the tubular workpiece on the flipping arm assembly. When the support arm assembly moves circularly at the release groove, at this time, the tubular workpiece forms a fixed-point release internal support and fixing structure on the flipping arm assembly through the support arm assembly. In this way, it is convenient for the feeding and discharging of the tubular workpiece during welding processing. Description of the Drawings

[0015] Figure 1 is a three-dimensional view of the present invention; Figure 2 is a three-dimensional view of another perspective of the present invention; Figure 3 is an exploded view of the present invention; Figure 4 is a three-dimensional view of the welding flipping machine base assembly of the present invention; Figure 5 is a three-dimensional view of the flipping arm assembly, the support arm assembly and the follow-up cleaning arm assembly of the present invention; Figure 6 is an exploded view of the flipping arm assembly and the support arm assembly of the present invention; Figure 7 is a three-dimensional view of the follow-up cleaning arm assembly of the present invention.

[0016] In the figure: 100, welding turnover machine base assembly; 101, mounting base; 102, circular walking arm; 103, drive motor; 104, release groove; 105, belt; 106, transposition arm; 107, transposition shaft; 108, grooved pulley; 109, fixed rod; 110, L-shaped arm bracket; 200, turnover arm assembly; 201, turnover arm; 202, drive pulley; 203, limit sliding groove; 204, end ear; 300, support arm assembly; 301, support arm; 302, top spring; 303, roller; 304, side end ear; 305, support branch arm; 306, linkage arm; 307, support roller; 400, follow-up cleaning arm assembly; 401, cleaning circular table; 402, cleaning branch arm; 403, cleaning fixing plate; 404, cleaning follow-up gear; 405, cleaning brush rod; 406, cleaning limit gear ring; 407, cleaning internal gear; 500, tubular workpiece. Specific implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-7 As shown, the present invention provides a workpiece turnover device for a welding machine, including a welding turnover machine base assembly 100 and a tubular workpiece 500. The welding turnover machine base assembly 100 includes a mounting base 101. An L-shaped arm bracket 110 and a circular walking arm 102 are fixedly arranged on the mounting base 101. A drive motor 103 is fixedly arranged on the L-shaped arm bracket 110. A transposition shaft 107 is arranged on the output shaft of the drive motor 103. A transposition arm 106 is fixedly arranged at one end of the transposition shaft 107 away from the drive motor 103. Turnover arm assemblies 200 are rotatably arranged at both ends of the transposition arm 106. The two turnover arm assemblies 200 form a double-station turnover arm structure at both ends of the transposition arm 106 to expose the top and bottom surfaces of the tubular workpiece 500 respectively. Support arm assemblies 300 and follow-up cleaning arm assemblies 400 are respectively arranged inside and outside the turnover arm assemblies 200. The two turnover arm assemblies 200 form a 180-degree rotation and transposition structure at both ends of the transposition arm 106. During this process, the tubular workpieces 500 on the two turnover arm assemblies 200 form a 180-degree turnover and turning structure. At the same time, the follow-up cleaning arm assemblies 400 form a follow-up outer tube wall cleaning structure outside the tubular workpiece 500. The tubular workpiece 500 forms a fixed-point release of the inner support and fixation structure on the turnover arm assembly 200 through the support arm assembly 300.

[0019] In a preferred implementation mode, please refer to Figure 4 AndFigure 6 , release grooves 104 are provided at both the top and bottom of the arm body on the side of the circumferential walking arm 102 away from the mounting seat 101. A fixing rod 109 is fixedly provided on the frame of the L-shaped arm 110 on the side away from the drive motor 103. Two grooved pulleys 108 are fixedly provided on the side of the fixing rod 109 away from the L-shaped arm 110. A belt 105 is provided on the grooved pulley 108. The flipping arm assembly 200 includes a flipping arm 201. Two drive pulleys 202 are fixedly provided at one end of the flipping arm 201, and a plurality of limit chutes 203 and a plurality of end ears 204 are provided at the other end of the flipping arm 201. The flipping arm 201 is rotatably arranged at the end of the transposition arm 106 through a bearing. The drive pulley 202 is arranged at the rear side of the transposition arm 106. The belt 105 is sleeved between the grooved pulley 108 and the drive pulley 202. The diameter of the grooved pulley 108 is twice the diameter of the drive pulley 202. When the transposition arm 106 rotates 180 degrees, the drive pulley 202 rotates 180 degrees around the grooved pulley 108. When the transposition arm 106 rotates 180 degrees, the grooved pulley 108 has a reverse driving force on the drive pulley 202 through the belt 105 and drives the drive pulley 202 to rotate 360 degrees. That is, at this time, the tubular workpiece 500 outside the flipping arm assembly 200 synchronously performs a 180-degree flipping reverse action. Through this method, the flipping treatment of the tubular workpiece 500 is realized, so that the top and bottom surfaces of the tubular workpiece 500 are interchanged, that is, the exposed surfaces are interchanged, thus facilitating subsequent welding treatment.

[0020] In a preferred embodiment, please refer to Figure 6, the support arm assembly 300 includes a support arm 301. One end of the support arm 301 is fixedly provided with a roller 303, and the other end of the support arm 301 is fixedly provided with a plurality of side end ears 304. A support branch arm 305 is rotatably provided at the top of the side end ear 304. A support roller 307 is rotatably provided at the top of the support branch arm 305. A linkage arm 306 is rotatably provided in the middle of the support branch arm 305. A top spring 302 is fixedly provided on the bottom end surface of the roller 303. The support arm 301 slides horizontally back and forth within the flipping arm 201. The side end ears 304 slide horizontally back and forth within the limit chute 203. One end of the linkage arm 306 away from the support branch arm 305 is rotatably provided on the limit chute 203. Both ends of the top spring 302 respectively abut against the outer side surfaces of the roller 303 and the driving pulley 202. Through the pressing of the top spring 302, the roller 303 rotates and abuts against the outer side surface of the annular walking arm 102 to walk. During actual use, the support arm 301 slides forward within the flipping arm 201. At this time, a plurality of support branch arms 305 move forward. During this process, with the assistance of the linkage arm 306, at this time, a plurality of support rollers 307 are synchronously unfolded. At this time, the tubular workpiece 500 is internally supported and fixed outside the flipping arm assembly 200. During actual use, when the support arm 301 moves backward, at this time, a plurality of support branch arms 305 move backward. With the assistance of the linkage arm 306, at this time, a plurality of support rollers 307 are synchronously retracted and folded. At this time, the tubular workpiece 500 is released from the internal support and fixation on the flipping arm assembly 200. Through the above internal support and fixation method and the method of releasing the internal support and fixation, it is convenient for the loading and unloading of the tubular workpiece 500 during welding flipping.

[0021] In a preferred embodiment, please refer to Figure 7, the follower cleaning arm assembly 400 includes a cleaning circular platform 401, a cleaning internal gear 407 and a cleaning limit gear ring 406. A plurality of cleaning support arms 402 are fixedly arranged at the bottom of the cleaning circular platform 401. A cleaning brush rod 405 is rotatably arranged at one end of the cleaning support arm 402 away from the cleaning circular platform 401. A cleaning follower gear 404 is fixedly arranged at one end of the cleaning brush rod 405. The cleaning circular platform 401, the cleaning internal gear 407 and the cleaning limit gear ring 406 are coaxially arranged. A cleaning fixing plate 403 is fixedly arranged at the rear side of the cleaning limit gear ring 406. The cleaning limit gear ring 406 is fixed on the outer side surface of the transposition arm 106 through the cleaning fixing plate 403. The cleaning internal gear 407 is fixed on the flipping arm 201. The cleaning circular platform 401 is rotatably arranged on the flipping arm 201 through a bearing. The cleaning follower gear 404 is arranged between the cleaning internal gear 407 and the cleaning limit gear ring 406, and both sides of the cleaning follower gear 404 are respectively meshed with the outer side of the cleaning internal gear 407 and the inner side of the cleaning limit gear ring 406. When the cleaning internal gear 407 rotates, at this time, a plurality of cleaning follower gears 404 perform synchronous circular motion outside the cleaning internal gear 407, and the self-rotation of the cleaning follower gear 404 is realized while circularly moving. At this time, a plurality of cleaning brush rods 405 perform circular cleaning action and self-rotation cleaning action outside the tubular workpiece 500, so that the outer side surface of the tubular workpiece 500 is cleaned.

[0022] The working principle of the present invention is as follows: When the present invention is in use, two tubular workpieces 500 are fixedly arranged inside and supported by two flipping arm assemblies 200 at both ends of the transposition arm 106 through the support arm assembly 300. At this time, the top tube bodies of the two tubular workpieces 500 are exposed. At this time, welding treatment can be carried out on the top tube bodies of the tubular workpieces 500. Through this method, double-station welding treatment is realized. At this time, one of the double stations can represent the top tube body welding station, and the other station can represent the bottom tube body welding station.

[0023] On the above basis, when double-sided reverse flipping of a double-station is required, that is, during the position-changing process, flipping processing of the top and bottom surfaces of the workpiece is achieved, so that the top and bottom surfaces of the workpiece are interchanged to achieve reverse flipping, exposing the bottom surface, and enabling welding of the bottom surface of the workpiece. The specific working principle is as follows. When flipping, the position-changing arm 106 is driven by the driving motor 103 to rotate 180 degrees. At this time, the two flipping arm assemblies 200 at both ends of the position-changing arm 106 rotate 180 degrees for position-changing. During this process, since the grooved pulley 108 is fixedly arranged on the L-shaped arm bracket 110, and the driving pulley 202 is arranged at the end of the flipping arm 201. It should be emphasized that the grooved pulley 108 is fixedly arranged and cannot rotate, and the driving pulley 202 is arranged at the end of the flipping arm 201 and can drive the flipping arm 201 to rotate. When the position-changing arm 106 rotates 180 degrees, at this time, the driving pulley 202 rotates 180 degrees around the grooved pulley 108. Since a belt 105 is sleeved between the grooved pulley 108 and the driving pulley 202, and the diameter of the grooved pulley 108 is larger than the diameter of the driving pulley 202, when the position-changing arm 106 rotates 180 degrees, the grooved pulley 108 has a reverse driving force on the driving pulley 202 through the belt 105 and drives the driving pulley 202 to rotate 360 degrees. At this time, there is a rotation angle difference between the position-changing arm 106 and the flipping arm 201, that is, a difference of 180 degrees. That is, when the position-changing arm 106 drives the flipping arm assembly 200 to rotate 180 degrees, at this time, the tubular workpiece 500 outside the flipping arm assembly 200 synchronously performs a 180-degree reverse flipping action. Through this method, the flipping processing of the tubular workpiece 500 outside the flipping arm assembly 200 is achieved. That is, through this method, the top and bottom surfaces of the tubular workpiece 500 are flipped and interchanged and the flipped surface is exposed, facilitating the welding processing of the exposed surface.

[0024] On the above basis, when the position-changing arm 106 rotates 180 degrees, at this time, the flipping arm 201 rotates synchronously at the end of the position-changing arm 106. When the flipping arm 201 rotates, at this time, the flipping arm 201 drives the cleaning internal gear 407 to rotate. Since the cleaning follower gear 404 is arranged between the cleaning internal gear 407 and the cleaning limit tooth ring 406, and both sides of the cleaning follower gear 404 are meshed with the outer side of the cleaning internal gear 407 and the inner side of the cleaning limit tooth ring 406 respectively, when the cleaning internal gear 407 rotates, at this time, multiple cleaning follower gears 404 perform synchronous circular motion outside the cleaning internal gear 407. While performing circular motion, the self-rotation of the cleaning follower gears 404 is achieved. That is, at this time, the cleaning brush rods 405 on multiple cleaning follower gears 404 perform circular motion and self-rotation motion outside the tubular workpiece 500. Through this method, circular cleaning and self-rotation cleaning of the outside of the tubular workpiece 500 are achieved. Through this double-layer cleaning, the outer side surface of the tubular workpiece 500 is cleaned, avoiding false soldering caused by dust or welding chips in the subsequent process.

[0025] On the above basis, the tubular workpiece 500 is internally supported and fixed on the flipping arm assembly 200 through the support arm assembly 300, and the tubular workpiece 500 forms a constant internal support fixing structure and a fixed-point release internal support fixing structure on the flipping arm assembly 200 through the support arm assembly 300. The specific working principle is as follows. When the roller 303 moves in a circular motion on the outer side of the protrusion of the circular walking arm 102, at this time, the support arm 301 is inside the flipping arm 201 and slides towards the end of the limit chute 203. At this time, the support arm 301 drives a plurality of support arms 305 to move forward. During the forward movement of the support arms 305, with the assistance of the linkage arm 306, the support rollers 307 at the ends of the plurality of support arms 305 are synchronously deployed. That is, in this way, the constant internal support fixation of the tubular workpiece 500 outside the flipping arm assembly 200 is realized. When the roller 303 walks to the release groove 104, that is, the transposition arm 106 rotates 90 degrees. At this time, the top spring 302 pushes the roller 303 backward to drive the support arm 301 away from the limit chute 203, that is, the support arm 301 moves backward. At this time, the plurality of support arms 305 move backward. With the assistance of the linkage arm 306, the support rollers 307 at the ends of the plurality of support arms 305 are synchronously retracted. That is, the tubular workpiece 500 forms a structure for fixed-point release of internal support fixation on the flipping arm assembly 200. Through the above constant internal support fixation, it is convenient to fix the tubular workpiece 500 on the flipping arm assembly 200, thereby facilitating the subsequent flipping and surface treatment. Through the above fixed-point release internal support fixation structure, it is convenient to release the fixation of the tubular workpiece 500 on the flipping arm assembly 200, thereby facilitating the loading and unloading of the tubular workpiece 500 during welding.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A workpiece turnover device for a welding machine, comprising a welding turnover machine base assembly (100) and a tubular workpiece (500), characterized in that: The described welding turnover base assembly (100) includes a mounting base (101). A L-shaped boom (110) and a ring traveling arm (102) are fixedly arranged on the mounting base (101). A driving motor (103) is fixedly arranged on the L-shaped boom (110). A transposition shaft (107) is arranged on the output shaft of the driving motor (103). A transposition arm (106) is fixedly arranged at one end of the transposition shaft (107) away from the driving motor (103). Rotating arm assemblies (200) are rotatably arranged at both ends of the transposition arm (106). The two groups of rotating arm assemblies (200) form a double-station rotating arm structure at both ends of the transposition arm (106) to expose the top and bottom surfaces of the tubular workpiece (500) respectively. A support arm assembly (300) and a follow-up cleaning arm assembly (400) are respectively arranged inside and outside the rotating arm assembly (200). The two groups of rotating arm assemblies (200) form a 180-degree rotating transposition structure at both ends of the transposition arm (106). During this process, the tubular workpieces (500) on the two groups of rotating arm assemblies (200) form a 180-degree turning and reversing structure. At the same time, the follow-up cleaning arm assembly (400) forms a follow-up outer tube wall cleaning structure outside the tubular workpiece (500). The tubular workpiece (500) forms a structure of fixed-point releasing internal support fixation on the rotating arm assembly (200) through the support arm assembly (300).

2. The workpiece turning device of a welding machine according to claim 1, wherein: Release grooves (104) are respectively opened at the top and bottom of the side arm body of the ring traveling arm (102) away from the mounting base (101). A fixed rod (109) is fixedly arranged on the frame body of the L-shaped boom (110) away from the driving motor (103). Two grooved pulleys (108) are fixedly arranged at one side of the fixed rod (109) away from the L-shaped boom (110). A belt (105) is arranged on the grooved pulley (108).

3. The workpiece turning device of a welding machine according to claim 2, characterized in that: The rotating arm assembly (200) includes a rotating arm (201). Two driving pulleys (202) are fixedly arranged at one end of the rotating arm (201). A plurality of limit sliding grooves (203) and a plurality of end ears (204) are opened at the other end of the rotating arm (201).

4. The workpiece turnover device of a welding machine according to claim 1, characterized in that: The support arm assembly (300) includes a support arm (301). A roller (303) is fixedly arranged at one end of the support arm (301). A plurality of side end ears (304) are fixedly arranged at the other end of the support arm (301). A support support arm (305) is rotatably arranged at the top of the side end ear (304). A support roller (307) is rotatably arranged at the top of the support support arm (305). A linkage arm (306) is rotatably arranged in the middle of the support support arm (305). A jacking spring (302) is fixedly arranged on the bottom end surface of the roller (303).

5. The workpiece turning device of a welding machine according to claim 1, characterized in that: The follow-up cleaning arm assembly (400) includes a cleaning circular platform (401), a cleaning internal gear (407), and a cleaning limit tooth ring (406). A plurality of cleaning support arms (402) are fixedly arranged at the bottom of the cleaning circular platform (401). One end of the cleaning support arm (402) far away from the cleaning circular platform (401) is rotatably provided with a cleaning brush rod (405). One end of the cleaning brush rod (405) is fixedly provided with a cleaning follow-up gear (404). The cleaning circular platform (401), the cleaning internal gear (407), and the cleaning limit tooth ring (406) are coaxially arranged. A cleaning fixing plate (403) is fixedly arranged at the rear side of the cleaning limit tooth ring (406).

6. The workpiece turning device of a welding machine according to claim 3, characterized in that: The flipping arm (201) is rotatably arranged at the end of the transposition arm (106) through a bearing. The driving pulley (202) is arranged at the rear side of the transposition arm (106). The belt (105) is sleeved between the grooved pulley (108) and the driving pulley (202). The diameter of the grooved pulley (108) is twice that of the driving pulley (202).

7. The workpiece turnover device of a welding machine according to claim 4, characterized in that: The support arm (301) slides horizontally back and forth within the flipping arm (201). The side end ear (304) slides horizontally back and forth within the limit sliding groove (203). One end of the linkage arm (306) far away from the support arm (305) is rotatably arranged on the limit sliding groove (203).

8. The workpiece turnover device of a welding machine according to claim 4, characterized in that: Both ends of the pressing spring (302) respectively abut against the outer side surfaces of the roller (303) and the driving pulley (202). Through the pressing of the pressing spring (302), the roller (303) circumferentially abuts and moves on the outer side surface of the annular walking arm (102).

9. The workpiece turning device of a welding machine according to claim 5, characterized in that: The cleaning limit tooth ring (406) is fixed on the outer side surface of the transposition arm (106) through the cleaning fixing plate (403). The cleaning internal gear (407) is fixed on the flipping arm (201). The cleaning circular platform (401) is rotatably arranged on the flipping arm (201) through a bearing.

10. The workpiece turnover device of a welding machine according to claim 5, characterized in that: The cleaning follow-up gear (404) is arranged between the cleaning internal gear (407) and the cleaning limit tooth ring (406), and both sides of the cleaning follow-up gear (404) are respectively meshed with the outer side of the cleaning internal gear (407) and the inner side of the cleaning limit tooth ring (406).

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