U-shaped frame welding device for electric vehicle production

Abstract

The invention discloses a U-shaped frame welding device for electric vehicle production, and particularly relates to the technical field of electric vehicle accessory production, the U-shaped frame welding device comprises a working table, a first positioning mechanism is fixedly mounted on one side of the top end of the working table, and a second positioning mechanism is fixedly mounted on the side, away from the first positioning mechanism, of the top end of the working table; a first linear electric rail is arranged between the first positioning mechanism and the second positioning mechanism, a mounting bottom frame is fixedly mounted at the driving end of the first linear electric rail, a welding mechanism is fixedly mounted at the top end of the mounting bottom frame, and a conveying belt is arranged below the first positioning mechanism and the second positioning mechanism. The first positioning mechanism and the second positioning mechanism are arranged to position the electric vehicle chassis and the electric vehicle U-shaped frame correspondingly, the welding angle of the electric vehicle U-shaped frame is convenient to adjust, and the welding stability and flexibility of the electric vehicle U-shaped frame are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric vehicle accessories production, in particular to a U-shaped frame welding device for electric vehicle production. Background Art

[0002] An electric moto three-wheeled vehicle is a three-wheeled vehicle powered by electricity, usually used for carrying cargo, passengers or short-distance transportation. It has the advantages of simple structure, relatively low price, easy operation, environmental protection and zero emissions. It is widely used in logistics, express delivery, rental and other fields in rural and urban areas. When the chassis of an electric three-wheeled motorcycle is produced and processed, the U-frame needs to be welded and fixed. The traditional method of welding and fixing the U-frame on the chassis is mostly to dock the U-frame at the appropriate position on the chassis. The U-frame and the chassis need to be positioned using a positioning mechanism, and then the U-frame is welded by a handheld welding machine. There are certain differences in the quality of manual welding, and it is easy to cause incorrect welding and welding leakage, which affects the overall processing quality of the subsequent chassis. After the U-frame and the chassis are welded, an external lifting equipment is needed to lift the welded U-frame and chassis from above the positioning mechanism, which is more troublesome. Therefore, we propose a U-frame welding device for electric vehicle production to solve the above problems. Summary of the Invention

[0003] The object of the present invention is to provide a U-shaped frame welding device for electric vehicle production to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A U-shaped frame welding device for electric vehicle production, comprising a workbench, a first positioning mechanism fixedly installed on one side of the top of the workbench, a second positioning mechanism fixedly installed on the side of the top of the workbench away from the first positioning mechanism, a first linear electric rail is provided between the first positioning mechanism and the second positioning mechanism, a mounting base is fixedly installed on the driving end of the first linear electric rail, a welding mechanism is fixedly installed on the top of the mounting base, and a conveyor belt is provided below the first positioning mechanism and the second positioning mechanism.

[0005] Preferably, the first positioning mechanism includes two symmetrically distributed first brackets, the two first brackets are fixedly mounted on one side of the top of the workbench, the top of each of the first brackets is fixedly mounted with a first positioning member, and there are multiple first positioning members; The first positioning member includes two symmetrically distributed second linear electric rails, the second linear electric rails are fixedly installed on the top of the first bracket, and the driving ends of the two second linear electric rails are fixedly installed with a positioning base plate, the inner end of the positioning base plate is vertically installed with a positioning side plate, the inner end of the positioning base plate is integrally formed with a positioning support plate, the inner end of the positioning base plate is rotatably installed with a flip horizontal axis, the outer side of the flip horizontal axis is fixedly installed with a flip support plate, the top of the flip support plate is vertically installed with a flip side plate, the position of the flip side plate and the position of the positioning side plate correspond to each other, the width dimension of the flip support plate is larger than the width dimension of the positioning support plate, one end of the flip horizontal axis extends out of the side end of the positioning base plate and is fixedly installed with a first gear, the top end of the first gear is meshed and connected with a driving rack, and one end of the driving rack is vertically installed with a mounting bracket, and the mounting bracket is fixedly installed on the top of the first bracket.

[0006] Preferably, the second positioning mechanism includes two symmetrically distributed third linear electric rails, the third linear electric rails are fixedly installed on the top of the workbench, the driving ends of the two third linear electric rails are fixedly installed with the first cylinder, the driving ends of the first cylinders are fixedly installed with positioning brackets, the top of the positioning bracket is provided with a flip bracket, the side end of the flip bracket close to the first positioning mechanism is provided with a second positioning member, the structure of the second positioning member is the same as that of the first positioning member, the second positioning member is fixedly installed on the side end of the flip bracket through the second linear electric rail, and the second positioning member is fixedly installed on the side end of the flip bracket through the mounting bracket.

[0007] Preferably, a flip seat is fixedly mounted on one end of the positioning bracket close to the first positioning mechanism, and a flip shaft is integrally formed at the bottom end of the flip bracket, and the flip shaft is rotatably mounted on the flip seat.

[0008] Preferably, a first seat is fixedly installed on the side of the flip bracket away from the second positioning member, a second seat is rotatably installed on the first seat, a second cylinder is provided at the end of the second seat, a driving end of the second cylinder is fixedly installed on the bottom end of the second seat, a through slot corresponding to the second cylinder is provided on the positioning bracket, the second cylinder movably passes through the through slot, a sleeve is fixedly installed on the outer side of the second cylinder, a rotating horizontal axis is vertically installed on the outer side of the sleeve, a rotating base is fixedly installed on the side of the bottom end of the positioning bracket close to the rotating horizontal axis, and the rotating horizontal axis is rotatably installed on the rotating base.

[0009] Preferably, the welding mechanism includes a second bracket, the second bracket is fixedly mounted on the top end of the mounting base, a telescopic cylinder is fixedly mounted on the second bracket, a third bracket is fixedly mounted on the driving end of the telescopic cylinder, a fourth bracket is fixedly mounted on the end of the third bracket, a fifth bracket is provided on the side of the fourth bracket away from the third bracket, and a welding part is fixedly mounted on the side of the fifth bracket away from the fourth bracket.

[0010] Preferably, the welding part includes an outer ring frame, a transmission frame is integrally formed on one side of the outer ring frame, the transmission frame is fixedly mounted on the side of the fifth bracket away from the fourth bracket, a gear ring frame is rotatably clamped in the outer ring frame, a first fracture is opened on the side of the outer ring frame away from the transmission frame, a second fracture is opened on the side of the gear ring frame away from the transmission frame, a fourth linear electric rail is fixedly mounted on the middle part of the inner side of the gear ring frame, a welding seat is fixedly mounted on the driving end of the fourth linear electric rail, a welding head is obliquely mounted on the welding seat, two second gears are symmetrically distributed up and down provided in the transmission frame, the second gear is meshed with the outer side of the gear ring frame, a drive shaft is fixedly mounted on the middle part of the second gear, and the drive shaft is rotatably mounted on the transmission frame.

[0011] Preferably, a sprocket transmission member is fixedly mounted on the outer ends of the two drive shafts. The sprocket transmission member includes two sprockets and a chain meshed with the outer sides of the two sprockets. The sprockets are fixedly mounted on the outer ends of the drive shafts respectively.

[0012] Preferably, a protective cover is fixedly installed on the outside of the transmission frame, the sprocket transmission member is located in the protective cover, the protective cover is fixedly installed on the outside of the transmission frame, a drive motor is fixedly installed on the top of the protective cover, and the drive end of the drive motor and the shaft end of one of the drive shafts are fixedly installed.

[0013] Preferably, a rotating horizontal axis is fixedly installed in the middle of the fifth bracket, and the rotating horizontal axis is rotatably installed in the middle of the fourth bracket. A rotating cylinder is fixedly installed on the fourth bracket, and the driving end of the rotating cylinder and the shaft end of the rotating horizontal axis are fixedly installed.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the first positioning mechanism and the second positioning mechanism, the electric vehicle chassis and the electric vehicle U-shaped frame are positioned respectively, and the welding angle of the electric vehicle U-shaped frame is adjusted conveniently, thereby improving the stability and flexibility of the electric vehicle U-shaped frame welding.

[0015] 2. By setting the first positioning mechanism and the second positioning mechanism, after welding is completed, the electric vehicle U-shaped frame and the electric vehicle chassis can be directly dropped onto the conveyor belt from below for transportation for subsequent processing, without the need to use external equipment for lifting and unloading, thereby improving the welding efficiency of the entire U-shaped frame.

[0016] 3. By setting up a welding mechanism, it is possible to achieve full-surround automatic welding of the welding parts of the electric vehicle U-frame and the electric vehicle chassis, thereby improving the welding efficiency of the entire U-frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the first positioning mechanism in the present invention.

[0020] Figure 3 Schematic diagram of the structure of the first positioning member in the present invention.

[0021] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle.

[0022] Figure 5 It is a structural schematic diagram of the second positioning mechanism in the present invention.

[0023] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle.

[0024] Figure 7 This is a structural diagram of the second positioning mechanism in the present invention from another angle.

[0025] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle.

[0026] Figure 9 It is a structural schematic diagram of the welding mechanism in the present invention.

[0027] Figure 10 For the present invention Figure 9 Enlarged view of point D in the middle.

[0028] Figure 11 It is a structural schematic diagram of the welding part in the present invention.

[0029] In the figure: 1. workbench; 11. first linear electric rail; 12. mounting base; 2. first positioning mechanism; 21. first bracket; 3. second positioning mechanism; 5. welding mechanism; 6. conveyor belt; 7. first positioning member; 8. electric vehicle chassis; 81. electric vehicle U-shaped frame; 71. second linear electric rail; 72. positioning base plate; 73. positioning side plate; 74. positioning support plate; 75. flip horizontal axis; 76. flip support plate; 761. flip side plate; 77. first gear; 771. driving rack; 772. mounting bracket; 31. third linear electric rail; 32. first cylinder; 33. positioning bracket; 331. flip seat; 34. flip bracket; 341. flip axis; 35. second positioning member ;36. First seat;361. Second seat;37. Second cylinder;371. Through slot;372. Sleeve;373. Rotating horizontal axis;374. Rotating base;51. Second bracket;52. Telescopic cylinder;53. Third bracket;54. Fourth bracket;55. Fifth bracket;551. Rotating horizontal axis;552. Rotating cylinder;56. Welding part;561. Outer ring frame;562. Transmission frame;563. Gear ring frame;501. First fracture;502. Second fracture;564. Fourth linear electric rail;565. Welding seat;566. Welding head;567. Second gear;5671. Drive shaft;568. Sprocket transmission part;569. Protective cover;5691. Drive motor. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example: Figure 1-11 As shown, the present invention provides a U-shaped frame welding device for electric vehicle production, including a workbench 1, a first positioning mechanism 2 is fixedly installed on one side of the top of the workbench 1, a second positioning mechanism 3 is fixedly installed on the side of the top of the workbench 1 away from the first positioning mechanism 2, a first linear electric rail 11 is provided between the first positioning mechanism 2 and the second positioning mechanism 3, a mounting base 12 is fixedly installed on the driving end of the first linear electric rail 11, a welding mechanism 5 is fixedly installed on the top of the mounting base 12, a conveyor belt 6 is provided below the first positioning mechanism 2 and the second positioning mechanism 3, and the conveyor belt 6 is provided to transport the welded electric vehicle chassis 8 and the electric vehicle U-shaped frame 81 for subsequent processing.

[0032] The first positioning mechanism 2 includes two symmetrically distributed first brackets 21, which are fixedly mounted on one side of the top of the workbench 1. The top of each of the first brackets 21 is fixedly mounted with a first positioning member 7, and there are multiple first positioning members 7. The first positioning member 7 includes two symmetrically distributed second linear electric rails 71, the second linear electric rails 71 are fixedly mounted on the top of the first bracket 21, the driving ends of the two second linear electric rails 71 are fixedly mounted with a positioning base plate 72, the inner end of the positioning base plate 72 is vertically mounted with a positioning side plate 73, the inner end of the positioning base plate 72 is integrally formed with a positioning support plate 74, the inner end of the positioning base plate 72 is rotatably mounted with a flip horizontal axis 75, the outer side of the flip horizontal axis 75 is fixedly mounted with a flip support plate 76, the top of the flip support plate 76 is vertically mounted with a flip side plate 761, the position of the flip side plate 761 corresponds to the position of the positioning side plate 73, the width of the flip support plate 76 is greater than the width of the positioning support plate 74, and the positioning base plate 72, the positioning side plate 73 and the positioning support plate 74 as well as the flip support plate 76 and the flip side plate 761 are driven to slide in translation by opening the two second linear electric rails 71; One end of the flip horizontal axis 75 extends out of the side end of the positioning base plate 72 and is fixedly installed with a first gear 77. The top of the first gear 77 is meshedly connected with a driving rack 771. One end of the driving rack 771 is vertically installed with a mounting bracket 772. The mounting bracket 772 is fixedly installed on the top of the first bracket 21. When the positioning base plate 72 slides horizontally, it drives the flip horizontal axis 75 and the first gear 77 to slide synchronously. Since the first gear 77 and the driving rack 771 are meshed and connected, the driving rack 771 controls the first gear 77 to rotate, thereby driving the flip horizontal axis 75 to rotate synchronously, and then controlling the flip support plate 76 and the flip side plate 761 to rotate.

[0033] The second positioning mechanism 3 includes two symmetrically distributed third linear electric rails 31, and the third linear electric rails 31 are fixedly installed on the top of the workbench 1. The driving ends of the two third linear electric rails 31 are fixedly installed with the first cylinder 32, and the driving ends of the first cylinder 32 are fixedly installed with the positioning bracket 33. The top of the positioning bracket 33 is provided with a flip bracket 34, and the side end of the flip bracket 34 close to the first positioning mechanism 2 is provided with a second positioning member 35. The structure of the second positioning member 35 is the same as that of the first positioning member 7. The second positioning member 35 is fixedly installed on the side end of the flip bracket 34 through the second linear electric rail 71. The second positioning member 35 is fixedly installed on the side end of the flip bracket 34 through the mounting bracket 772. The second positioning member 35 is driven to move to one side of the first positioning mechanism 2 by opening the two third linear electric rails 31.

[0034] The positioning bracket 33 is fixedly installed with a flip seat 331 at one end close to the first positioning mechanism 2, and a flip shaft 341 is integrally formed at the bottom end of the flip bracket 34, and the flip shaft 341 is rotatably installed on the flip seat 331; the flip bracket 34 is fixedly installed with a first seat 36 on the side away from the second positioning member 35, and a second seat 361 is rotatably installed on the first seat 36, and a second cylinder 37 is provided at the end of the second seat 361, and the driving end of the second cylinder 37 is fixedly installed at the bottom end of the second seat 361, and a through slot 371 corresponding to the second cylinder 37 is opened on the positioning bracket 33, and the second cylinder 37 movably passes through the through slot 371, and the outer side of the second cylinder 37 is fixedly installed It is equipped with a sleeve 372, and a rotating horizontal axis 373 is vertically installed on the outer side of the sleeve 372. A rotating base 374 is fixedly installed on the side of the bottom end of the positioning bracket 33 close to the rotating horizontal axis 373. The rotating horizontal axis 373 is rotatably installed on the rotating base 374 to rotate the second cylinder 37. By opening the second cylinders 37 on both sides, the flip bracket 34 is controlled to rotate at one end of the positioning bracket 33, thereby adjusting the angle of the flip bracket 34, and then facilitating the adjustment of the angle of the electric vehicle U-shaped frame 81, making it convenient for the electric vehicle U-shaped frame 81 to be welded to the electric vehicle chassis 8 at different angles, thereby increasing the welding flexibility of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8.

[0035] The welding mechanism 5 includes a second bracket 51, which is fixedly mounted on the top of the mounting base 12. A telescopic cylinder 52 is fixedly mounted on the second bracket 51. A third bracket 53 is fixedly mounted on the driving end of the telescopic cylinder 52. A fourth bracket 54 is fixedly mounted on the end of the third bracket 53. A fifth bracket 55 is provided on the side of the fourth bracket 54 away from the third bracket 53. A welding piece 56 is fixedly mounted on the side of the fifth bracket 55 away from the fourth bracket 54. The welding piece 56 is driven to move horizontally by opening the telescopic cylinder 52. A rotating horizontal axis 551 is fixedly installed in the middle of the fifth bracket 55, and the rotating horizontal axis 551 is rotatably installed in the middle of the fourth bracket 54. A rotating cylinder 552 is fixedly installed on the fourth bracket 54. The driving end of the rotating cylinder 552 and the axial end of the rotating horizontal axis 551 are fixedly installed. By turning on the rotating cylinder 552, the rotating horizontal axis 551 is driven to drive the welding part 56 to rotate.

[0036] The welding part 56 includes an outer ring frame 561, and a transmission frame 562 is integrally formed on one side of the outer ring frame 561. The transmission frame 562 is fixedly mounted on the side of the fifth bracket 55 away from the fourth bracket 54. A gear ring frame 563 is rotatably clamped in the outer ring frame 561. A first break 501 is formed on the side of the outer ring frame 561 away from the transmission frame 562, and a second break 502 is formed on the side of the gear ring frame 563 away from the transmission frame 562. The first break 501 and the second break 502 facilitate the welding part 56 to pass through the first break 501 and the second break 502 through the welding part of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8, so that the welding part is moved to the outer ring frame 561 and the gear ring frame 563 through the first break 501 and the second break 502. A fourth linear electric rail 564 is fixedly mounted on the inner middle portion of the gear ring frame 563. A welding seat 565 is fixedly mounted on the driving end of the fourth linear electric rail 564. A welding head 566 is tiltedly mounted on the welding seat 565. The welding head 566 is driven to move by turning on the fourth linear electric rail 564. The transmission frame 562 is provided with two second gears 567 symmetrically distributed in the upper and lower parts. The second gears 567 are meshed with the outer side of the gear ring frame 563. A driving shaft 5671 is fixedly installed in the middle of the second gear 567, and the driving shaft 5671 is rotatably mounted on the transmission frame 562; the outer ends of the two driving shafts 5671 are fixedly mounted with sprocket transmission members 568, and the sprocket transmission member 568 includes two sprockets and chains meshed with the outer sides of the two sprockets. The sprockets are respectively fixedly mounted on the outer ends of the driving shafts 5671; a protective cover 569 is fixedly installed on the outer side of the transmission frame 562, and the sprocket transmission member 568 is located in the protective cover 569. The protective cover 569 is fixedly mounted On the outside of the transmission frame 562, a driving motor 5691 is fixedly installed on the top of the protective cover 569, and the driving end of the driving motor 5691 and the shaft end of one of the driving shafts 5671 are fixedly installed. By turning on the driving motor 5691, one of the driving shafts 5671 is driven to rotate, and the transmission of the sprocket transmission member 568 is cooperated to drive the two second gears 567 to rotate synchronously, thereby controlling the gear ring frame 563 to rotate in the outer ring frame 561, adjusting the angles of the welding head 566 and the fourth linear electric rail 564, and facilitating the welding head 566 to weld and fix the welding parts of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8 at different positions.

[0037] Working principle: In the initial state, the flip bracket 34 is in a horizontal state. By turning on the two third linear electric rails 31, the second positioning members 35 are driven to move horizontally, and the second positioning members 35 on both sides are moved to a suitable position. The electric vehicle U-shaped frame 81 is placed between the second positioning members 35 on both sides through an external lifting mechanism, so that the electric vehicle U-shaped frame 81 is positioned on the positioning side plates 73 and the flip support plates 76 in the second positioning members 35 on both sides, and between the positioning side plates 73 and the flip side plates 761; Then, the electric vehicle chassis 8 is placed on the positioning side plates 73 and the flip support plates 76 of the multiple first positioning members 7 on both sides, and between the positioning side plates 73 and the flip side plates 761 through an external lifting mechanism; Then, the two third linear electric rails 31 are turned on to drive the second positioning member 35 and the electric vehicle U-shaped frame 81 to move toward one side of the first positioning mechanism 2; During this period, according to the different welding angles between the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8, the angle of the electric vehicle U-shaped frame 81 is adjusted, the second cylinders 37 on both sides are controlled to open, and the flip bracket 34 is controlled to rotate at one end of the positioning bracket 33, thereby adjusting the angle of the flip bracket 34, thereby facilitating the adjustment of the angle of the electric vehicle U-shaped frame 81; Continue to control the electric vehicle U-shaped frame 81 to move toward one side of the first positioning mechanism 2 until the welding portion of the electric vehicle U-shaped frame 81 and the welding portion of the electric vehicle chassis 8 are automatically connected; Subsequently, the first linear electric rail 11 is turned on to control the horizontal movement of the welding mechanism 5 so that the position of the welding head 566 in the welding mechanism 5 corresponds to the welding position of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8; Subsequently, the telescopic cylinder 52 is activated to drive the welding piece 56 to move horizontally, and the welding piece 56 is passed through the first break 501 and the second break 502 through the welding portion of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8, so that the welding portion is moved to the outer ring frame 561 and the gear ring frame 563 through the first break 501 and the second break 502; According to the different welding angles of the welding parts, the rotating cylinder 552 is turned on to drive the rotating horizontal shaft 551 to drive the welding part 56 to rotate, so as to adapt to welding at different welding angles; During this period, by turning on the drive motor 5691 to drive one of the drive shafts 5671 to rotate, the transmission of the sprocket transmission member 568 is coordinated to drive the two second gears 567 to rotate synchronously, thereby controlling the gear ring frame 563 to rotate in the outer ring frame 561, adjusting the angles of the welding head 566 and the fourth linear electric rail 564, so that the welding head 566 can weld and fix the welding parts of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8 at different positions, thereby achieving full surrounding welding of the welding parts of the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8; After welding is completed, the gear ring frame 563 is rotated and reset to make the first break 501 and the second break 502 correspond to each other. Then, the telescopic cylinder 52 is turned on to drive the welding piece 56 to move horizontally in the opposite direction, so that the welding piece 56 is separated from the welding part between the electric vehicle U-shaped frame 81 and the electric vehicle chassis 8. Subsequently, the second linear electric rails 71 in the multiple first positioning members 7 and the second positioning members 35 are opened synchronously, driving the positioning base plate 72, the positioning side plate 73 and the positioning support plate 74 as well as the flip support plate 76 and the flip side plate 761 to slide horizontally and backwards. While sliding, since the first gear 77 and the driving rack 771 are engaged, the driving rack 771 controls the first gear 77 to rotate, thereby driving the flip horizontal axis 75 to rotate synchronously, and then controlling the flip support plate 76 and the flip side plate 761 to rotate, pushing the U-shaped frame 81 and the electric vehicle chassis 8 of the welded electric vehicle to fall directly from below onto the conveyor belt 6 for transportation for subsequent processing, without the need to use external equipment to lift and unload materials, thereby improving the welding efficiency of the entire U-shaped frame.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A U-shaped frame welding device for electric vehicle production, comprising a workbench (1), characterized in that: A first positioning mechanism (2) is fixedly installed on one side of the top of the workbench (1), a second positioning mechanism (3) is fixedly installed on the side of the top of the workbench (1) away from the first positioning mechanism (2), a first linear electric rail (11) is provided between the first positioning mechanism (2) and the second positioning mechanism (3), a mounting base (12) is fixedly installed on the driving end of the first linear electric rail (11), a welding mechanism (5) is fixedly installed on the top of the mounting base (12), and a conveyor belt (6) is provided below the first positioning mechanism (2) and the second positioning mechanism (3).

2. A U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: The first positioning mechanism (2) comprises two symmetrically distributed first brackets (21), the two first brackets (21) being fixedly mounted on one side of the top end of the workbench (1), the top end of each of the first brackets (21) being fixedly mounted with a first positioning member (7), and a plurality of the first positioning members (7) being provided; The first positioning member (7) includes two symmetrically distributed second linear electric rails (71), the second linear electric rails (71) are fixedly mounted on the top of the first bracket (21), the driving ends of the two second linear electric rails (71) are fixedly mounted with positioning base plates (72), the inner ends of the positioning base plates (72) are vertically mounted with positioning side plates (73), the inner ends of the positioning base plates (72) are integrally formed with positioning support plates (74), the inner ends of the positioning base plates (72) are rotatably mounted with a flip horizontal axis (75), the outer sides of the flip horizontal axis (75) are fixedly mounted with a flip support plate (76), and the flip support plate (7 6) is vertically mounted with a flip side plate (761), the position of the flip side plate (761) corresponds to the position of the positioning side plate (73), the width of the flip support plate (76) is larger than the width of the positioning support plate (74), one end of the flip horizontal axis (75) extends out of the side end of the positioning base plate (72) and is fixedly mounted with a first gear (77), the top end of the first gear (77) is meshedly connected with a driving rack (771), one end of the driving rack (771) is vertically mounted with a mounting bracket (772), and the mounting bracket (772) is fixedly mounted on the top end of the first bracket (21).

3. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: The second positioning mechanism (3) includes two symmetrically distributed third linear electric rails (31), the third linear electric rails (31) are fixedly mounted on the top of the workbench (1), the driving ends of the two third linear electric rails (31) are fixedly mounted with a first cylinder (32), the driving ends of the first cylinder (32) are fixedly mounted with a positioning bracket (33), the top of the positioning bracket (33) is provided with a flip bracket (34), the flip bracket (34) is provided with a second positioning member (35) at the side end close to the first positioning mechanism (2), the structure of the second positioning member (35) is the same as that of the first positioning member (7), the second positioning member (35) is fixedly mounted on the side end of the flip bracket (34) through the second linear electric rail (71), and the second positioning member (35) is fixedly mounted on the side end of the flip bracket (34) through the mounting bracket (772).

4. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: A flip seat (331) is fixedly mounted on one end of the positioning bracket (33) close to the first positioning mechanism (2), and a flip shaft (341) is integrally formed at the bottom end of the flip bracket (34), and the flip shaft (341) is rotatably mounted on the flip seat (331).

5. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: A first seat (36) is fixedly mounted on a side of the flip bracket (34) away from the second positioning member (35), a second seat (361) is rotatably mounted on the first seat (36), a second cylinder (37) is provided at the end of the second seat (361), a driving end of the second cylinder (37) is fixedly mounted on the bottom end of the second seat (361), a through slot (371) corresponding to the second cylinder (37) is provided on the positioning bracket (33), the second cylinder (37) movably passes through the through slot (371), a sleeve (372) is fixedly mounted on the outside of the second cylinder (37), a rotating horizontal axis (373) is vertically mounted on the outside of the sleeve (372), a rotating base (374) is fixedly mounted on the side of the bottom end of the positioning bracket (33) close to the rotating horizontal axis (373), and the rotating horizontal axis (373) is rotatably mounted on the rotating base (374).

6. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: The welding mechanism (5) comprises a second bracket (51), the second bracket (51) being fixedly mounted on the top end of the mounting base (12), a telescopic cylinder (52) being fixedly mounted on the second bracket (51), a third bracket (53) being fixedly mounted on the driving end of the telescopic cylinder (52), a fourth bracket (54) being fixedly mounted on the end of the third bracket (53), a fifth bracket (55) being provided on a side of the fourth bracket (54) away from the third bracket (53), and a welding member (56) being fixedly mounted on a side of the fifth bracket (55) away from the fourth bracket (54).

7. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: The welded part (56) includes an outer ring frame (561), a transmission frame (562) is integrally formed on one side of the outer ring frame (561), the transmission frame (562) is fixedly mounted on a side of the fifth bracket (55) away from the fourth bracket (54), a gear ring frame (563) is rotatably clamped in the outer ring frame (561), a first fracture (501) is provided on a side of the outer ring frame (561) away from the transmission frame (562), a second fracture (502) is provided on a side of the gear ring frame (563) away from the transmission frame (562), and the gear ring frame (563) is provided with a plurality of slits. A fourth linear electric rail (564) is fixedly installed in the middle of the inner side, a welding seat (565) is fixedly installed on the driving end of the fourth linear electric rail (564), and a welding head (566) is obliquely installed on the welding seat (565). Two second gears (567) symmetrically distributed in the upper and lower parts are provided in the transmission frame (562), and the second gears (567) are meshedly connected with the outer sides of the gear ring frame (563). A driving shaft (5671) is fixedly installed in the middle of the second gear (567), and the driving shaft (5671) is rotatably installed on the transmission frame (562).

8. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: The outer ends of the two drive shafts (5671) are fixedly mounted with sprocket transmission members (568), the sprocket transmission member (568) comprising two sprockets and a chain meshed with the outer sides of the two sprockets, the sprockets being fixedly mounted on the outer ends of the drive shafts (5671) respectively.

9. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: A protective cover (569) is fixedly mounted on the outside of the transmission frame (562), the sprocket transmission member (568) is located in the protective cover (569), the protective cover (569) is fixedly mounted on the outside of the transmission frame (562), a driving motor (5691) is fixedly mounted on the top of the protective cover (569), and the driving end of the driving motor (5691) and the shaft end of one of the driving shafts (5671) are fixedly mounted.

10. The U-shaped frame welding device for electric vehicle production according to claim 1, characterized in that: A rotating transverse shaft (551) is fixedly mounted in the middle of the fifth bracket (55), and the rotating transverse shaft (551) is rotatably mounted in the middle of the fourth bracket (54). A rotating cylinder (552) is fixedly mounted on the fourth bracket (54), and a driving end of the rotating cylinder (552) and an axial end of the rotating transverse shaft (551) are fixedly mounted.

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