Gear box assembly welding device

Abstract

The present invention discloses a gearbox assembly welding device, which belongs to the technical field of gearbox welding, and comprises a side feeding device, wherein the side feeding device is used to feed the side gearbox body to be welded into the welding device, and the positive feeding device is used to feed the spur gearbox body to be welded into the welding device, and the welding device is used to butt and weld two side gearbox bodies and two spur gearbox bodies. The side feeding device and the positive feeding device provided by the present invention can automatically perform surface sandblasting treatment on the side gearbox body and the spur gearbox body to be welded, improve the flatness of the butt joint surface, make the butt joint more stable, thereby improving the welding quality; the side gearbox body and the spur gearbox body are turned over and butt jointed under the action of the turning mechanism, and are pressed by a spring, thereby improving the welding quality; the welding device first drives the butt joint and pressing of the side gearbox body and the spur gearbox body to be welded, and then welds the weld in the gearbox, and has a high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of gear box welding, and in particular to a gear box assembling welding device. Background Art

[0002] A gearbox is a mechanical device used to transmit power and change the speed. It has a specific number of gears installed inside to achieve the purpose of changing the speed and torque. There are many ways to make a gearbox. Generally, small gearboxes are cast, while medium and large gearboxes need to be made using welding technology. Usually, when welding a gearbox, manual welding is mainly used, and the gearbox body needs to be manually aligned and welded. For medium and large equipment, manual operation will result in large errors and low work efficiency. The gearbox welding device in the prior art still needs to be manually assembled and positioned when in use, and the degree of automation is not high. Summary of the invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a gear box assembly welding device, including a side feeding device, the side feeding device includes a side feeding rack, the side feeding device is used to send the side gear box body to be welded to the welding device, the positive feeding device includes a positive feeding rack, the positive feeding device is used to send the spur gear box body to be welded to the welding device, the welding device includes a lower rack, and the welding device is used to dock and weld two side gear boxes and two spur gear boxes to form an integral gear box.

[0004] Furthermore, the side feeding device includes an upper motor and a slope motor fixedly mounted on the side feeding frame, a motor gear is fixedly mounted on the motor shaft of the upper motor, a motor wheel is fixedly mounted on the motor shaft of the slope motor, a plurality of rollers and inclined rollers are rotatably mounted on the side feeding frame, a transmission gear is fixedly mounted on the roller, a toothed belt is wound around the transmission gear, the toothed belt is meshed with the motor gear, a slope roller gear is fixedly mounted on the inclined roller, a transmission belt is wound around the motor wheel and the slope roller gear, and a side processing mechanism is arranged on the side feeding frame.

[0005] Furthermore, the side processing mechanism includes a pump fixedly mounted on the side feed rack, a feed pipe fixedly mounted on the pump, a nozzle fixedly mounted on the feed pipe, a spray box fixedly mounted on the side feed rack, the nozzle fixedly mounted on the spray box, and a door curtain is provided on the spray box.

[0006] The side gear box to be welded is placed on the roller with the welding surface facing up. The upper motor rotates to drive the motor gear to rotate, and the motor gear drives the toothed belt to rotate, thereby driving the transmission gear and roller to rotate, so as to transport the side gear box to the spray box, and the sand in the external sand box is transported to the feed pipe and nozzle through the pump, and the welding surface of the side gear box is sandblasted through the nozzle, so as to improve the subsequent welding quality. Then the side gear box reaches the inclined roller, and the slope motor rotates to drive the motor wheel to rotate, and the slope roller gear and the inclined roller are driven to rotate through the transmission belt to transport the side gear box to the side pressure plate.

[0007] Furthermore, the positive feeding device includes a positive motor and a positive slope motor fixedly mounted on the positive feeding frame, a positive motor gear is fixedly mounted on the motor shaft of the positive motor, a positive wheel is fixedly mounted on the motor shaft of the positive slope motor, a plurality of positive rollers and positive oblique rollers are rotatably mounted on the positive feeding frame, a positive tooth belt is fixedly mounted on the positive roller, a spur gear is wound around the spur tooth belt, the spur gear is meshed with the positive motor gear, a positive slope wheel is fixedly mounted on the positive oblique roller, a positive transmission belt is wound around the positive wheel and the positive slope wheel, and a positive processing mechanism is arranged on the positive feeding frame.

[0008] Furthermore, the positive processing mechanism includes a positive pump fixedly mounted on a positive feed rack, a positive feeding pipe fixedly mounted on the positive pump, a positive nozzle fixedly mounted on the positive feeding pipe, a positive spray box fixedly mounted on the positive feed rack, the positive nozzle fixedly mounted on the positive spray box, and a shielding curtain is arranged on the positive spray box.

[0009] The spur gear box to be welded is placed on the positive roller with the welding surface facing upwards. The rotation of the positive motor drives the positive motor gear to rotate, and the positive motor gear drives the spur gear to rotate, thereby driving the spur tooth belt and the positive roller to rotate, so as to transport the spur gear box to the positive spray box, and the sand in the external sand box is transported to the positive feed pipe and the positive nozzle through the positive pump, and the welding surface of the spur gear box is sandblasted through the positive nozzle, so as to improve the subsequent welding quality. Then the spur gear box reaches the positive inclined roller, and the rotation of the positive slope motor drives the positive wheel to rotate, and the positive slope wheel and the positive inclined roller are driven to rotate through the positive transmission belt, and the spur gear box is transported to the positive pressure plate.

[0010] Furthermore, the welding device includes a top frame fixedly mounted on the lower frame, an electric cylinder fixedly mounted on the top frame, a welding frame fixedly mounted on the top of the electric cylinder, four welding guns fixedly mounted on the welding frame, a descending frame slidably mounted on the welding frame, a strong spring is arranged between the welding frame and the descending frame, a flipping mechanism is arranged on the lower frame, and a pressing mechanism is arranged on the descending frame.

[0011] Furthermore, the flipping mechanism includes a side rotation column and a positive rotation column fixedly mounted on the lower frame, a side flipping box is rotatably mounted on the side rotation column, a positive flipping box is rotatably mounted on the positive rotation column, a side pressure plate is slidably mounted in the side flipping box, a side pressure spring is arranged between the side flipping box and the side pressure plate, and a positive pressure spring is arranged between the positive pressure plate and the positive flipping box.

[0012] Furthermore, the downward pressure mechanism includes a downward pressure plate fixedly installed on the descending frame, a downward pressure column fixedly installed on the downward pressure plate, a downward pressure block fixedly installed on the downward pressure column, a side connecting rod and a front connecting rod rotatably installed on the lower pressure block, the side connecting rod is rotatably installed with the side flip box, and the front connecting rod is rotatably installed with the front flip box.

[0013] When the side gear box and spur gear box to be welded fall onto the side pressure plate and the positive pressure plate respectively, the electric cylinder extends to drive the welding frame to descend, thereby driving the descending frame to descend through the strong spring, and the descent of the descending frame drives the lower pressure plate, the lower pressure column and the lower pressure block to descend, thereby driving the side connecting rod and the positive connecting rod to rotate, thereby driving the side flip box and the positive flip box to rotate, thereby driving the side gear box and the spur gear box to stand up, the side flip box and the positive flip box rotate ninety degrees, and the side pressure plate and the positive pressure plate are driven by the side pressure spring and the positive pressure spring to press the side gear box and the spur gear box tightly.

[0014] When the lower pressure plate touches the bottom, the welding frame will continue to descend and will not drive the descending frame to continue descending. The strong spring begins to be compressed, and then the welding frame descends, driving the welding gun to descend. At this time, the welding gun begins to contact the weld on the inside of the gear box, and the weld on the inside of the gear box is welded from top to bottom through four welding guns.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) the side feeding device and the positive feeding device provided in the present invention can automatically perform surface sandblasting treatment on the side gear housing and the spur gear housing to be welded, thereby improving the flatness of the butt joint surface and making the butt joint more stable, thereby improving the welding quality; (2) the side gear housing and the spur gear housing provided in the present invention are flipped and butt jointed under the action of the flipping mechanism, and are pressed by a spring, so that the surfaces to be welded are closely fitted, which is more convenient for welding and improves the welding quality; (3) the welding device provided in the present invention first drives the butt joint and pressing of the side gear housing and the spur gear housing to be welded, and then automatically welds the weld in the gear housing through four welding guns, with a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 The side feeding device of the present invention is schematically shown in FIG. Figure 1 .

[0018] Figure 3 The side feeding device of the present invention is schematically shown in FIG. Figure 1 .

[0019] Figure 4 The structure of the positive feeding device of the present invention is shown in FIG. Figure 1 .

[0020] Figure 5 The structure of the positive feeding device of the present invention is shown in FIG. Figure 2 .

[0021] Figure 6 The structure of the welding device of the present invention is shown in FIG. Figure 1 .

[0022] Figure 7 The structure of the welding device of the present invention is shown in FIG. Figure 2 .

[0023] Figure 8 The structure of the flipping mechanism of the present invention is shown in FIG. Figure 1 .

[0024] Fig. 9 The structure of the flipping mechanism of the present invention is shown in FIG. Figure 2 .

[0025] Fig.10 The structure of the welding device of the present invention is shown in FIG. Figure 3 .

[0026] Figure numbers: 101-side feed rack; 102-pump; 103-feeding pipe; 104-nozzle; 105-spray box; 106-door curtain; 107-roller; 108-oblique roller; 109-upper motor; 110-motor gear; 111-transmission gear; 112-toothed belt; 113-slope motor; 114-motor wheel; 115-slope roller gear; 116-transmission belt; 201-positive feed rack; 202-positive pump; 203-positive feed pipe; 204-positive nozzle; 205-positive spray box; 206-shielding curtain; 207-positive roller; 208-positive oblique roller; 209-positive motor; 210-positive motor gear; 211-spur belt; 212-spur gear; 213-positive slope motor; 214-positive wheel; 215-positive slope wheel; 216-positive transmission belt; 301-lower frame; 302-top frame; 303-electric cylinder; 304-welding frame; 305-welding gun; 306-strong spring; 307-lowering frame; 308-side flip box; 309-side pressure plate; 310-side pressure spring; 311-positive flip box; 312-positive pressure plate; 313-positive pressure spring; 314-lower pressure plate; 315-lower pressure column; 316-lower pressure block; 317-side connecting rod; 318-positive connecting rod; 319-side rotation column; 320-positive rotation column. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Example: Reference Figure 1-Figure 10A gear box assembly welding device includes a side feeding device, the side feeding device includes a side feeding rack 101, the side feeding device is used to send the side gear box body to be welded to the welding device, the positive feeding device includes a positive feeding rack 201, the positive feeding device is used to send the spur gear box body to be welded to the welding device, the welding device includes a lower rack 301, and the welding device is used to dock and weld two side gear boxes and two spur gear boxes to form an integral gear box.

[0029] like Figure 2 , Figure 3 As shown, the side feeding device includes an upper motor 109 and a slope motor 113 fixedly mounted on the side feeding frame 101, a motor gear 110 is fixedly mounted on the motor shaft of the upper motor 109, a motor wheel 114 is fixedly mounted on the motor shaft of the slope motor 113, a plurality of rollers 107 and inclined rollers 108 are rotatably mounted on the side feeding frame 101, a transmission gear 111 is fixedly mounted on the roller 107, a toothed belt 112 is wound around the transmission gear 111, the toothed belt 112 is meshed with the motor gear 110, a slope roller gear 115 is fixedly mounted on the inclined roller 108, a transmission belt 116 is wound around the motor wheel 114 and the slope roller gear 115, and a side processing mechanism is provided on the side feeding frame 101.

[0030] like Figure 2 , Figure 3 As shown, the side processing mechanism includes a pump 102 fixedly mounted on a side feed rack 101, a feed pipe 103 fixedly mounted on the pump 102, a nozzle 104 fixedly mounted on the feed pipe 103, a spray box 105 fixedly mounted on the side feed rack 101, the nozzle 104 fixedly mounted on the spray box 105, and a door curtain 106 is provided on the spray box 105.

[0031] The side gear box to be welded is placed on the roller 107 with the welding surface facing upwards. The upper motor 109 rotates to drive the motor gear 110 to rotate, and the motor gear 110 drives the toothed belt 112 to rotate, thereby driving the transmission gear 111 and the roller 107 to rotate, so as to transport the side gear box to the spray box 105, and the sand in the external sand box is transported to the feed pipe 103 and the nozzle 104 by the pump 102, and the welding surface of the side gear box is sandblasted by the nozzle 104, so as to improve the subsequent welding quality, and then the side gear box reaches the inclined roller 108, and the slope motor 113 rotates to drive the motor wheel 114 to rotate, and the slope roller gear 115 and the inclined roller 108 are driven to rotate by the transmission belt 116, and the side gear box is transported to the side pressure plate 309.

[0032] like Figure 4 , Figure 5As shown, the positive feeding device includes a positive motor 209 and a positive slope motor 213 fixedly mounted on the positive feeding frame 201, a positive motor gear 210 is fixedly mounted on the motor shaft of the positive motor 209, a positive wheel 214 is fixedly mounted on the motor shaft of the positive slope motor 213, a plurality of positive rollers 207 and positive oblique rollers 208 are rotatably mounted on the positive feeding frame 201, a positive toothed belt 211 is fixedly mounted on the positive roller 207, a positive gear 212 is wound around the positive toothed belt 211, the positive gear 212 is meshed with the positive motor gear 210, a positive slope wheel 215 is fixedly mounted on the positive oblique roller 208, a positive transmission belt 216 is wound around the positive wheel 214 and the positive slope wheel 215, and a positive processing mechanism is provided on the positive feeding frame 201.

[0033] like Figure 4 , Figure 5 As shown, the positive processing mechanism includes a positive pump 202 fixedly mounted on a positive feeding rack 201, a positive feeding pipe 203 fixedly mounted on the positive pump 202, a positive nozzle 204 fixedly mounted on the positive feeding pipe 203, a positive spray box 205 fixedly mounted on the positive feeding rack 201, the positive nozzle 204 fixedly mounted on the positive spray box 205, and a shielding curtain 206 is provided on the positive spray box 205.

[0034] The spur gear box to be welded is placed with the welding surface facing upward on the positive roller 207, the positive motor 209 rotates to drive the positive motor gear 210 to rotate, and the positive motor gear 210 drives the spur gear 212 to rotate, thereby driving the spur tooth belt 211 and the positive roller 207 to rotate, so as to transport the spur gear box to the positive spray box 205, and the sand in the external sand box is transported to the positive feed pipe 203 and the positive nozzle 204 through the positive pump 202, and the welding surface of the spur gear box is sandblasted through the positive nozzle 204, so as to improve the subsequent welding quality, and then the spur gear box reaches the positive inclined roller 208, and the positive slope motor 213 rotates to drive the positive wheel 214 to rotate, and the positive slope wheel 215 and the positive inclined roller 208 are driven to rotate through the positive transmission belt 216, and the spur gear box is transported to the positive pressure plate 312.

[0035] like Figure 6-Figure 10 As shown, the welding device includes a top frame 302 fixedly mounted on a lower frame 301, an electric cylinder 303 fixedly mounted on the top frame 302, a welding frame 304 fixedly mounted on the top of the electric cylinder 303, four welding guns 305 fixedly mounted on the welding frame 304, a descending frame 307 slidably mounted on the welding frame 304, a strong spring 306 is arranged between the welding frame 304 and the descending frame 307, a flipping mechanism is arranged on the lower frame 301, and a pressing mechanism is arranged on the descending frame 307.

[0036] like Figure 6-Figure 10As shown, the flipping mechanism includes a side rotation column 319 and a positive rotation column 320 fixedly mounted on the lower frame 301, the side flip box 308 is rotatably mounted on the side rotation column 319, the positive flip box 311 is rotatably mounted on the positive rotation column 320, a side pressure plate 309 is slidably mounted in the side flip box 308, a side pressure spring 310 is arranged between the side flip box 308 and the side pressure plate 309, and a positive pressure spring 313 is arranged between the positive pressure plate 312 and the positive flip box 311.

[0037] like Figure 6-Figure 10 As shown, the pressing mechanism includes a pressing plate 314 fixedly mounted on the descending frame 307, a pressing column 315 fixedly mounted on the pressing plate 314, a pressing block 316 fixedly mounted on the pressing column 315, a side connecting rod 317 and a front connecting rod 318 rotatably mounted on the lower pressing block 316, the side connecting rod 317 is rotatably mounted on the side flip box 308, and the front connecting rod 318 is rotatably mounted on the front flip box 311.

[0038] When the side gear box and spur gear box to be welded fall onto the side pressure plate 309 and the positive pressure plate 312 respectively, the electric cylinder 303 extends to drive the welding frame 304 to descend, thereby driving the descending frame 307 to descend through the strong spring 306, and the descent of the descending frame 307 drives the lower pressure plate 314, the lower pressure column 315 and the lower pressure block 316 to descend, thereby driving the side connecting rod 317 and the positive connecting rod 318 to rotate, thereby driving the side flip box 308 and the positive flip box 311 to rotate, thereby driving the side gear box and the spur gear box to stand up, the side flip box 308 and the positive flip box 311 to rotate ninety degrees, and the side pressure spring 310 and the positive pressure spring 313 drive the side pressure plate 309 and the positive pressure plate 312 to press the side gear box and the spur gear box.

[0039] When the lower pressure plate 314 touches the bottom, the welding frame 304 continues to descend and will not drive the descending frame 307 to continue to descend. The strong spring 306 begins to be compressed, and then the welding frame 304 descends and drives the welding gun 305 to descend. At this time, the welding gun 305 begins to contact the inner weld of the gear box, and the inner weld of the gear box is welded from top to bottom through four welding guns 305.

[0040] The working principle of a gear box assembly welding device disclosed in the present invention is: the side gear box body to be welded is placed on the roller 107 with the welding surface facing up, the upper motor 109 rotates to drive the motor gear 110 to rotate, the motor gear 110 drives the toothed belt 112 to rotate, thereby driving the transmission gear 111 and the roller 107 to rotate, so as to transport the side gear box body to the spray box 105, and the sand in the external sand box is transported to the feed pipe 103 and the nozzle 104 through the pump 102, and the welding surface of the side gear box body is sandblasted through the nozzle 104, so as to improve the subsequent welding quality, and then the side gear box body reaches the inclined roller 108, and the slope motor 113 rotates to drive the motor wheel 114 to rotate, and the slope roller gear 115 and the inclined roller 108 are driven to rotate through the transmission belt 116, and the side gear box body is transported to the side pressure plate 309. The spur gear box to be welded is placed with the welding surface facing upward on the positive roller 207, the positive motor 209 rotates to drive the positive motor gear 210 to rotate, and the positive motor gear 210 drives the spur gear 212 to rotate, thereby driving the spur tooth belt 211 and the positive roller 207 to rotate, so as to transport the spur gear box to the positive spray box 205, and the sand in the external sand box is transported to the positive feed pipe 203 and the positive nozzle 204 through the positive pump 202, and the welding surface of the spur gear box is sandblasted through the positive nozzle 204, so as to improve the subsequent welding quality, and then the spur gear box reaches the positive inclined roller 208, and the positive slope motor 213 rotates to drive the positive wheel 214 to rotate, and the positive slope wheel 215 and the positive inclined roller 208 are driven to rotate through the positive transmission belt 216, and the spur gear box is transported to the positive pressure plate 312. When the side gear box and spur gear box to be welded fall onto the side pressure plate 309 and the positive pressure plate 312 respectively, the electric cylinder 303 extends to drive the welding frame 304 to descend, thereby driving the descending frame 307 to descend through the strong spring 306, and the descent of the descending frame 307 drives the lower pressure plate 314, the lower pressure column 315 and the lower pressure block 316 to descend, thereby driving the side connecting rod 317 and the positive connecting rod 318 to rotate, thereby driving the side flip box 308 and the positive flip box 311 to rotate, thereby driving the side gear box and the spur gear box to stand up, the side flip box 308 and the positive flip box 311 to rotate ninety degrees, and the side pressure spring 310 and the positive pressure spring 313 drive the side pressure plate 309 and the positive pressure plate 312 to press the side gear box and the spur gear box. When the lower pressure plate 314 touches the bottom, the welding frame 304 continues to descend and will not drive the descending frame 307 to continue to descend. The strong spring 306 begins to be compressed, and then the welding frame 304 descends and drives the welding gun 305 to descend. At this time, the welding gun 305 begins to contact the inner weld of the gear box, and the inner weld of the gear box is welded from top to bottom through four welding guns 305.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gearbox assembly welding device, comprising a side feeding device, characterized in that: The side feeding device comprises a side feeding frame (101), and the side feeding device is used to feed the side gear housing to be welded into the welding device; the positive feeding device comprises a positive feeding frame (201), and the positive feeding device is used to feed the spur gear housing to be welded into the welding device; the welding device comprises a lower frame (301), and the welding device is used to butt and weld two side gear housings and two spur gear housings to form an integral gear housing; The side feeding device comprises an upper motor (109) and a slope motor (113) fixedly mounted on the side feeding frame (101); a motor gear (110) is fixedly mounted on the motor shaft of the upper motor (109); a motor wheel (114) is fixedly mounted on the motor shaft of the slope motor (113); a plurality of rollers (107) and inclined rollers (108) are rotatably mounted on the side feeding frame (101); a transmission gear (111) is fixedly mounted on the roller (107); a toothed belt (112) is wound around the transmission gear (111); the toothed belt (112) is meshed with the motor gear (110); a slope roller gear (115) is fixedly mounted on the inclined roller (108); a transmission belt (116) is wound around the motor wheel (114) and the slope roller gear (115); and a side processing mechanism is provided on the side feeding frame (101); The side processing mechanism comprises a pump (102) fixedly mounted on the side feeding frame (101), a feeding pipe (103) fixedly mounted on the pump (102), a nozzle (104) fixedly mounted on the feeding pipe (103), a spray box (105) fixedly mounted on the side feeding frame (101), the nozzle (104) fixedly mounted on the spray box (105), and a door curtain (106) provided on the spray box (105); The positive feeding device comprises a positive motor (209) and a positive slope motor (213) fixedly mounted on a positive feeding frame (201); a positive motor gear (210) is fixedly mounted on the motor shaft of the positive motor (209); a positive wheel (214) is fixedly mounted on the motor shaft of the positive slope motor (213); a plurality of positive rollers (207) and positive oblique rollers (208) are rotatably mounted on the positive feeding frame (201); a positive toothed belt (211) is fixedly mounted on the positive roller (207); a positive gear (212) is wound around the outside of the positive toothed belt (211); the positive gear (212) meshes with the positive motor gear (210); a positive slope wheel (215) is fixedly mounted on the positive oblique roller (208); a positive transmission belt (216) is wound around the outside of the positive wheel (214) and the positive slope wheel (215); and a positive processing mechanism is provided on the positive feeding frame (201); The positive treatment mechanism comprises a positive pump (202) fixedly mounted on a positive feeding rack (201), a positive feeding pipe (203) fixedly mounted on the positive pump (202), a positive nozzle (204) fixedly mounted on the positive feeding pipe (203), a positive spray box (205) fixedly mounted on the positive feeding rack (201), the positive nozzle (204) fixedly mounted on the positive spray box (205), and a shielding curtain (206) provided on the positive spray box (205); The welding device comprises a top frame (302) fixedly mounted on a bottom frame (301), an electric cylinder (303) fixedly mounted on the top frame (302), a welding frame (304) fixedly mounted on the top of the electric cylinder (303), four welding guns (305) fixedly mounted on the welding frame (304), a descending frame (307) slidably mounted on the welding frame (304), a strong spring (306) arranged between the welding frame (304) and the descending frame (307), a turning mechanism arranged on the bottom frame (301), and a pressing mechanism arranged on the descending frame (307).

2. A gearbox assembly welding device according to claim 1, characterized in that: The overturning mechanism comprises a side-rotating column (319) and a positive-rotating column (320) fixedly mounted on the lower frame (301); a side-overturning box (308) is rotatably mounted on the side-rotating column (319); a positive-overturning box (311) is rotatably mounted on the positive-rotating column (320); a side pressure plate (309) is slidably mounted in the side-overturning box (308); a side pressure spring (310) is arranged between the side-overturning box (308) and the side pressure plate (309); and a positive pressure spring (313) is arranged between the positive pressure plate (312) and the positive-overturning box (311).

3. A gearbox assembly welding device according to claim 2, characterized in that: The pressing mechanism comprises a pressing plate (314) fixedly mounted on the descending frame (307), a pressing column (315) fixedly mounted on the pressing plate (314), a pressing block (316) fixedly mounted on the pressing column (315), a side connecting rod (317) and a front connecting rod (318) rotatably mounted on the pressing block (316), the side connecting rod (317) and the side turning box (308) are rotatably mounted, and the front connecting rod (318) and the front turning box (311) are rotatably mounted.

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