Automatic welding device applied to bicycle

Abstract

The automatic welding device applied to the bicycle comprises a bottom plate, a vertical supporting column is fixedly connected to one side of the bottom plate, a rotating arm assembly is arranged at the top end of the supporting column, a vertical rotating pressing assembly is arranged at the end of the rotating arm assembly, and a follow-up bearing seat is arranged under the rotating pressing assembly; a vertical guide sleeve is arranged between the follow-up bearing seat and the rotary pressing assembly, a connecting arm is formed on the outer wall of one side of the guide sleeve, and the connecting arm is fixedly connected to the outer wall of the upper portion of the supporting column; the device can be used for loading a frame part consisting of a vertical pipe and a center shaft seat, can rotate the frame part to rotate and move up and down, can be matched with an automatic wire feeding welding machine to carry out ring welding operation, is relatively convenient to load and unload the frame part, and can effectively improve the welding efficiency and quality.

Description

Technical field:

[0001] The invention relates to the technical field of welding devices, and more particularly to an automatic welding device applied to bicycles. Background technology:

[0002] At present, the frame of a bicycle includes a seat tube, a middle shaft seat, a head tube, a top tube and a down tube, etc. The seat tube is used to install the seat tube, and a bench is installed on the top of the seat tube, while the lower end of the seat tube is welded and fixed to the middle shaft seat. At present, the welding of the seat tube and the middle shaft seat is generally performed manually with the help of an auxiliary clamp, but the manual welding efficiency is slow. Then, someone proposed to use an automatic wire feeding welding machine to realize the welding operation between the seat tube and the middle shaft seat, but the welding between the seat tube and the middle shaft seat is a circumferential welding, and the welding points are not in the same horizontal plane, and the existing auxiliary clamp can only clamp and fix the seat tube and the middle shaft seat, and cannot rotate and move the seat tube and the middle shaft seat. Therefore, it is necessary to design a device that can realize loading the seat tube and the middle shaft seat and drive the seat tube and the middle shaft seat to rotate and move up and down at the same time, so that the circumferential welding can be carried out in conjunction with the automatic wire feeding welding machine. Summary of the invention:

[0003] The purpose of the present invention is to address the deficiencies of the prior art and to provide an automatic welding device for bicycles, which can load frame components consisting of a seat tube and a center shaft seat, and can rotate the frame components and move them up and down, and can cooperate with an automatic wire feeding welding machine to perform circumferential welding operations. The loading and unloading of frame components are relatively convenient, and the welding efficiency and quality can be effectively improved.

[0004] An automatic welding device for bicycles comprises a bottom plate, a vertical support column is fixedly connected to one side of the bottom plate, a rotating arm assembly is arranged at the top of the support column, a vertical rotating pressing assembly is arranged at the end of the rotating arm assembly, a follower bearing seat is arranged directly below the rotating pressing assembly, a vertical guide sleeve is arranged between the follower bearing seat and the rotating pressing assembly, a connecting arm is formed on the outer wall of one side of the guide sleeve, and the connecting arm is fixedly connected to the outer wall of the upper part of the support column;

[0005] The rotating arm assembly comprises a horizontal rotating arm, one end of which is formed with a vertical rotating column sleeve, the lower end of which is pivotally connected to the rotating column sleeve, and the other end of which is formed with a circular connecting disk;

[0006] The rotary pressing assembly comprises a plurality of vertical pressing rods, which are inserted into the outer ring of the connecting disk, the upper end of the pressing rod is fixedly connected to a cylinder mounting plate, a vertical pressing cylinder is fixedly connected to the cylinder mounting plate, a piston rod of the pressing cylinder passes through the cylinder mounting plate and is fixedly connected to a cylindrical connecting seat, the lower end of the connecting seat is fixedly connected to the middle of the connecting disk; a spline sleeve is pivotally connected to the middle of the connecting disk, the lower end of the spline sleeve extends out of the connecting disk and is fixedly connected to a first gear, a second gear is meshed on one side of the first gear, the second gear sleeve is fixedly connected to the rotating shaft of the rotary motor, and the rotary motor is fixedly connected to the rotating arm;

[0007] A spline shaft is inserted in the spline shaft sleeve, the upper end of the spline shaft is inserted in the connecting seat, and the lower end is fixedly connected to a vertical T-shaped center column, the lower end of the center column passes through a circular holding plate and is fixedly connected to a conical holding head, the holding plate is fixedly connected to the lower end of the holding rod, an upper spring is inserted and sleeved on the center column, the upper end of the upper spring presses against the holding plate, and the lower end presses against the holding head, and the holding head is located directly above the guide sleeve;

[0008] The follower bearing seat includes a longitudinal arc-shaped support plate, a vertical follower shaft is formed on the lower bottom surface in the middle of the support plate, a step hole is formed in the middle of the support plate and passes through the lower end surface of the follower shaft, a T-shaped positioning shaft is inserted in the follower shaft, the lower end of the positioning shaft passes through the lower spring and is fixed on the lifting platform, a guide seat with an inverted U-shaped longitudinal section is fixedly connected to the lifting platform, a through hole is formed in the middle of the guide seat, the follower shaft is inserted in the through hole, vertical limit columns are fixedly connected to the lower end surfaces of the support plates on the left and right sides of the follower shaft, and balls are embedded in the lower ends of the limit columns, and the balls rest on the upper surface of the guide seat; the lifting platform is arranged on the bottom plate and drives the follower bearing seat to move up and down.

[0009] Preferably, the automatic welding device is loaded with bicycle frame components, which include a vertical standpipe and a horizontal longitudinal tubular middle axle seat, the middle axle seat is placed on a support plate, the standpipe is inserted in a guide sleeve, the lower end of the guide sleeve is an arc surface and fits with the outer wall of the upper side of the middle axle seat; the upper pressing head of the rotary pressing assembly is inserted and pressed against the top of the standpipe;

[0010] An automatic wire feeding welder is arranged at the rear side of the automatic welding device. The welding gun nozzle of the automatic wire feeding welder is tiltedly mounted on the rear side of the vertical pipe and faces the connection between the vertical pipe and the middle shaft seat.

[0011] Preferably, the diameter of the outer wall of the vertical tube is smaller than the diameter of the outer wall of the central axis seat; the central axis of the vertical tube, the central axis of the follower shaft and the central axis of the positioning shaft coincide. The guide seat is composed of a semicircular guide panel at the upper end and two sets of vertical plates at the lower part. The arc radius of the upper surface of the guide panel is equal to the radius of the outer wall of the central axis seat, and the center distance from the ball to the follower shaft is equal to the radius of the outer wall of the vertical tube.

[0012] Preferably, the lower end of the rotating column sleeve on the rotating arm assembly is connected to the supporting column through a bearing, and a T-shaped long bolt is inserted into the rotating column sleeve, and the lower end of the long bolt extends out of the rotating column sleeve and is screwed into the supporting column;

[0013] The third gear is fixedly connected to the sleeve on the rotating column sleeve, and the fourth gear is meshed with the third gear; an L-shaped bracket plate is fixedly connected to the outer wall at the top of the long bolt, the lower end of the bracket plate is fixedly connected to the connecting arm, a vertical rotating motor is fixedly connected to the bracket plate, and the fourth gear sleeve is fixedly connected to the rotating shaft of the rotating motor.

[0014] Preferably, the diameter of the inner wall of the guide sleeve is equal to the diameter of the outer wall of the riser; the lifting platform includes a rectangular lifting platform plate, and T-shaped guide columns are inserted at the four corners of the lifting platform plate, and the lower ends of the guide columns are fixedly connected to the bottom plate; the follower bearing seat is located in the middle and rear parts of the lifting platform plate, and the left and right sides of the front part of the lifting platform plate are fixedly connected with upright lifting cylinders, and the piston rod of the lifting cylinder passes through the lifting platform plate and is fixedly connected to the bottom plate.

[0015] Preferably, a feeding mechanism is arranged on the lifting platform between the lifting cylinders, and the feeding mechanism includes a longitudinal arc-shaped trough plate, and a longitudinal feeding cylinder is arranged on the front side of the trough plate, and a trough support frame is fixedly connected to the trough plate, and the lower end of the trough support frame is fixedly connected to the lifting platform, and the feeding cylinder is fixedly connected to the trough support frame, and the piston rod of the feeding cylinder is inserted in the trough plate and fixedly connected to a push plate.

[0016] Preferably, the rear end of the support plate is fixedly connected with a baffle, the rear end of the central axis seat abuts against the baffle, and the distance between the lifting platform and the bottom plate is greater than the distance from the top of the riser to the lower end surface of the guide sleeve;

[0017] A toggle assembly is provided between the riser and the support column, and the toggle assembly includes a vertical side plate, the upper end of the side plate is fixedly connected to the connecting arm, and a horizontal T-shaped toggle rod is inserted at the lower end, and a spherical toggle head is inserted and fixed at the end of the toggle rod. A compression spring is inserted and sleeved on the toggle rod, one end of the compression spring presses against the side plate, and the other end presses against the toggle head, and the toggle head elastically presses against the outer wall of the riser.

[0018] Preferably, the connecting seat is composed of a sealing plate at the top and a cylinder at the middle and lower parts. The diameter of the inner wall of the connecting seat is larger than the diameter of the spline shaft, and windows are formed on the outer walls of both sides of the cylinder on the connecting seat.

[0019] The beneficial effects of the present invention are:

[0020] The device can load the frame components consisting of the riser and the center shaft seat, and can rotate the frame components and move up and down. It can cooperate with the automatic wire feeding welding machine to perform ring welding operations. The loading and unloading of the frame components are relatively convenient, and the welding efficiency and quality can be effectively improved. Description of the drawings:

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of another angle of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the present invention;

[0024] Figure 4 It is a partial cross-sectional schematic diagram of the present invention in the front view direction;

[0025] Figure 5 It is a schematic diagram of the structure of the present invention from a top view.

[0026] In the figure: 1. Base plate; 2. Support column; 3. Guide sleeve; 4. Rotating arm assembly; 5. Rotating pressing assembly; 6. Follow-up bearing seat; 7. Feeding mechanism; 8. Toggle assembly; 9. Lifting platform; 10. Frame components. Specific implementation method:

[0027] Example: See Figures 1 to 4 As shown, an automatic welding device for bicycles comprises a bottom plate 1, a vertical support column 2 is fixedly connected to one side of the bottom plate 1, a rotating arm assembly 4 is arranged at the top of the support column 2, a vertical rotating pressing assembly 5 is arranged at the end of the rotating arm assembly 4, a follower bearing seat 6 is arranged directly below the rotating pressing assembly 5, a vertical guide sleeve 3 is arranged between the follower bearing seat 6 and the rotating pressing assembly 5, a connecting arm 31 is formed on the outer wall of one side of the guide sleeve 3, and the connecting arm 31 is fixedly connected to the outer wall of the upper part of the support column 2;

[0028] The rotating arm assembly 4 comprises a horizontal rotating arm 41, one end of which is formed with a vertical rotating column sleeve 411, the lower end of which is pivotally connected to the rotating column sleeve 411, and the other end of which is formed with a circular connecting plate 412;

[0029] The rotary pressing assembly 5 comprises a plurality of vertical pressing rods 51, which are inserted into the outer ring of the connecting disk 412. The upper end of the pressing rod 51 is fixedly connected to a cylinder mounting plate 52, on which an ear plate 521 is provided. The pressing rod 51 is specifically fixedly connected to the ear plate 521. A vertical pressing cylinder 53 is fixedly connected to the cylinder mounting plate 52. The piston rod of the pressing cylinder 53 passes through the cylinder mounting plate 52 and is fixedly connected to a cylindrical connecting seat 54. The lower end of the connecting seat 54 is fixedly connected to the middle of the connecting disk 412. A spline sleeve 56 is pivotally connected to the middle of the connecting disk 412. The lower end of the spline sleeve 56 extends out of the connecting disk 412 and is fixedly connected to a first gear 57. A second gear 58 is meshed on one side of the first gear 57. The second gear 58 is fixedly connected to the rotating shaft of a rotary motor 59. The rotary motor 59 is fixedly connected to the rotating arm 41.

[0030] The spline shaft sleeve 56 is inserted with a spline shaft 55, the upper end of the spline shaft 55 is inserted in the connection seat 54, and the lower end is fixedly connected to a vertical T-shaped center column 510, the lower end of the center column 510 passes through a circular holding plate 511 and is fixedly connected to a conical holding head 512, the holding plate 511 is fixedly connected to the lower end of the holding rod 51, and an upper spring 513 is inserted and sleeved on the center column 510, the upper end of the upper spring 513 is pressed against the holding plate 511, and the lower end is pressed against the holding head 512, and the holding head 512 is located directly above the guide sleeve 3;

[0031] The follower bearing seat 6 includes a longitudinal arc-shaped support plate 61, a vertical follower shaft 611 is formed on the lower bottom surface in the middle of the support plate 61, a step hole 612 is formed in the middle of the support plate 61 and passes through the lower end surface of the follower shaft 611, a T-shaped positioning shaft 66 is inserted in the follower shaft 611, and the lower end of the positioning shaft 66 passes through the lower spring 67 and is fixed on the lifting platform 9, a guide seat 65 with an inverted U-shaped longitudinal section is fixed on the lifting platform 9, a through hole 651 is formed in the middle of the guide seat 65, and the follower shaft 611 is inserted in the through hole 651, and vertical limiting columns 63 are fixed on the lower end surfaces of the support plates 61 on the left and right sides of the follower shaft 611, and the lower end of the limiting column 63 is embedded with a ball 64, and the ball 64 rests on the upper surface of the guide seat 65; the lifting platform 9 is arranged on the base plate 1 and drives the follower bearing seat 6 to move up and down.

[0032] The automatic welding device is loaded with a bicycle frame component 10, which includes a vertical standpipe 101 and a horizontal longitudinal and tubular middle axle seat 102, the middle axle seat 102 is placed on a support plate 61, the standpipe 101 is inserted into a guide sleeve 3, the lower end of the guide sleeve 3 is an arc surface and fits with the outer wall of the upper side of the middle axle seat 102; the upper pressing head 512 of the rotary pressing assembly 5 is inserted and pressed against the top of the standpipe 101; the arc radius of the upper bottom surface of the support plate 61 is equal to the diameter of the outer wall of the middle axle seat 102;

[0033] An automatic wire feeding welder is arranged at the rear side of the automatic welding device. The welding gun nozzle on the automatic wire feeding welder is tiltedly mounted on the rear side of the vertical pipe 101 and faces the connection between the vertical pipe 101 and the middle axle seat 102. The automatic welding device loads and positions the frame component 10 and drives the frame component 10 to rotate, so that the automatic wire feeding welder can realize circumferential welding of the connection between the middle axle seat 102 and the vertical pipe 101.

[0034] The diameter of the outer wall of the vertical tube 101 is smaller than the diameter of the outer wall of the central axis seat 102; the central axis of the vertical tube 101, the central axis of the follower shaft 611 and the central axis of the positioning shaft 66 coincide. The guide seat 65 is composed of a semicircular guide panel at the upper end and two sets of vertical plates at the lower part. The arc radius of the upper surface of the guide panel is equal to the radius of the outer wall of the central axis seat 102, and the center distance from the ball 64 to the follower shaft 611 is equal to the radius of the outer wall of the vertical tube 101. Because the welding traces of the above-mentioned ring welding are not in the same horizontal plane, the support plate 61 needs to move up and down during the rotation process, and driving the support plate 61 to move up and down is to move with the ball 64 in the ball 64.

[0035] The lower end of the rotating column sleeve 411 on the rotating arm assembly 4 is connected to the support column 2 through a bearing, and a T-shaped long bolt 42 is inserted into the rotating column sleeve 411. The lower end of the long bolt 42 extends out of the rotating column sleeve 411 and is screwed into the support column 2.

[0036] The third gear 43 is fixedly connected to the sleeve on the rotating column sleeve 411, and the fourth gear 43 is meshed with the third gear 43; an L-shaped bracket plate 46 is fixedly connected to the outer wall at the top of the long bolt 42, and the lower end of the bracket plate 46 is fixedly connected to the connecting arm 31, and a vertical rotating motor 45 is fixedly connected to the bracket plate 46, and the fourth gear 43 is fixedly connected to the rotating shaft of the rotating motor 45. The rotating motor 45 can drive the rotating pressing assembly 5 to move away from the top of the guide sleeve 3, so as to facilitate the insertion of the vertical pipe 101 into the guide sleeve 3 from top to bottom.

[0037] The diameter of the inner wall of the guide sleeve 3 is equal to the diameter of the outer wall of the vertical pipe 101; the lifting platform 9 includes a rectangular lifting platform 91, and T-shaped guide columns 92 are inserted at the four corners of the lifting platform 91, and the lower ends of the guide columns 92 are fixedly connected to the bottom plate 1; the follower bearing seat 6 is located in the middle and rear parts of the lifting platform 91, and the left and right sides of the front part of the lifting platform 91 are fixedly connected with upright lifting cylinders 93, and the piston rod of the lifting cylinder 93 passes through the lifting platform 91 and is fixedly connected to the bottom plate 1. The lifting cylinder 93 can drive the follower bearing seat 6 to rise or fall. When the follower bearing seat 6 falls, the vertical pipe 101 is separated from the guide sleeve 3, and the vertical pipe 101 is tilted under the action of the toggle head 83 in the following structure, and then under the action of gravity, the welded frame component 10 can fall from the left side of the follower bearing seat 6.

[0038] See Figure 4As shown, a feeding mechanism 7 is arranged on the lifting platform 91 between the lifting cylinders 93, and the feeding mechanism 7 includes a longitudinal arc-shaped material trough plate 71, and a longitudinal feeding cylinder 73 is arranged on the front side of the material trough plate 71, and a material trough support frame 72 is fixedly connected to the material trough plate 71, and the lower end of the material trough support frame 72 is fixedly connected to the lifting platform 91, and the feeding cylinder 73 is fixedly connected to the material trough support frame 72, and the piston rod of the feeding cylinder 73 is inserted in the material trough plate 71 and is fixedly connected to a push plate, the vertical pipe 101 can be installed in the guide sleeve 3 by a manipulator, and the central axis seat 102 can be transported to the material trough plate 71 through the material channel, and the central axis seat 102 is pushed into the support plate 61 by the feeding cylinder 73.

[0039] The rear end of the support plate 61 is fixedly connected with a baffle 62, the rear end of the central axis seat 102 abuts against the baffle 62, and the distance between the lifting platform 91 and the bottom plate 1 is greater than the distance from the top of the riser 101 to the lower end surface of the guide sleeve 3;

[0040] A toggle assembly 8 is provided between the riser 101 and the support column 2, and the toggle assembly 8 includes a vertical side plate 81, the upper end of the side plate 81 is fixedly connected to the connecting arm 31, and a horizontal T-shaped toggle rod 82 is inserted at the lower end, and a spherical toggle head 83 is inserted and fixed at the end of the toggle rod 82. A compression spring 84 is inserted and sleeved on the toggle rod 82, one end of the compression spring 84 presses against the side plate 81, and the other end presses against the toggle head 83, and the toggle head 83 elastically presses against the outer wall of the riser 101.

[0041] The connecting seat 54 is composed of a sealing plate at the top and a cylinder at the middle and lower parts. The diameter of the inner wall of the connecting seat 54 is larger than the diameter of the spline shaft 55. Windows 541 are formed on the outer walls of both sides of the cylinder of the connecting seat 54.

[0042] Working principle: This structure is an automatic welding device applied to bicycles. The main process of the automatic welding device is as follows:

[0043] First, the center axis seat 102 is placed in the support plate 61, and then the pressing assembly 5 is rotated to move away from the top of the guide sleeve 3, and then the vertical pipe 101 is inserted into the guide sleeve 3 and abutted against the center axis seat 102, and then the pressing assembly 5 is rotated to move above the vertical pipe 101, and the pressing cylinder 53 is started to drive the pressing head 512 to press on the vertical pipe 101 and realize the support plate 61 to move down and abut against the guide seat 65, and then the rotary motor 59 realizes the rotation of the pressing head 512 based on the gear transmission, driving the support plate 61 to rotate;

[0044] Therefore, the support plate 61 rotates around the positioning 66 along the upper surface of the guide seat 65, and its movement trajectory is the trajectory of the central axis seat 102 and the vertical pipe 101 passing through the welding gun nozzle, thereby realizing ring welding.

[0045] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore, the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. An automatic welding device for a bicycle, comprising a base plate (1), one side of which is fixedly connected to a vertical support column (2), characterized in that: A rotating arm assembly (4) is arranged at the top of the support column (2), a vertical rotating pressing assembly (5) is arranged at the end of the rotating arm assembly (4), a follower bearing seat (6) is arranged directly below the rotating pressing assembly (5), a vertical guide sleeve (3) is arranged between the follower bearing seat (6) and the rotating pressing assembly (5), a connecting arm (31) is formed on the outer wall of one side of the guide sleeve (3), and the connecting arm (31) is fixedly connected to the outer wall of the upper part of the support column (2); The rotating arm assembly (4) comprises a horizontal rotating arm (41), one end of the rotating arm (41) is formed with a vertical rotating column sleeve (411), the lower end of the rotating column sleeve (411) is pivotally connected to the rotating column sleeve (411), and the other end of the rotating arm (41) is formed with a circular connecting disk (412); The rotary pressing assembly (5) comprises a plurality of vertical pressing rods (51), the pressing rods (51) being inserted into the outer ring of the connecting plate (412), the upper end of the pressing rods (51) being fixedly connected to a cylinder mounting plate (52), the cylinder mounting plate (52) being fixedly connected to a vertical pressing cylinder (53), the piston rod of the pressing cylinder (53) passing through the cylinder mounting plate (52) being fixedly connected to a cylindrical connecting seat (54), the lower end of the connecting seat (54) being fixedly connected to a cylindrical connecting seat (54), and the lower end of the connecting seat (54) being fixedly connected to a cylindrical connecting seat (54). The end is fixedly connected to the middle part of the connecting disk (412); the middle part of the connecting disk (412) is pivotally connected with a spline shaft sleeve (56); the lower end of the spline shaft sleeve (56) extends out of the connecting disk (412); the spline shaft sleeve is fixedly connected with a first gear (57); one side of the first gear (57) is meshed with a second gear (58); the second gear (58) is fixedly connected to the rotating shaft of a rotary motor (59); and the rotary motor (59) is fixedly connected to the rotating arm (41); A spline shaft (55) is inserted into the spline shaft sleeve (56), the upper end of the spline shaft (55) is inserted into the connecting seat (54), and the lower end is fixedly connected to a vertical T-shaped center column (510), the lower end of the center column (510) passes through a circular holding plate (511) and is fixedly connected to a conical holding head (512), the holding plate (511) is fixedly connected to the lower end of the holding rod (51), an upper spring (513) is inserted into the center column (510), the upper end of the upper spring (513) is pressed against the holding plate (511), and the lower end is pressed against the holding head (512), and the holding head (512) is located directly above the guide sleeve (3); The follower bearing seat (6) comprises a longitudinal arc-shaped support plate (61), a vertical follower shaft (611) is formed on the lower bottom surface of the middle part of the support plate (61), a stepped hole (612) penetrating the lower end surface of the follower shaft (611) is formed in the middle part of the support plate (61), a T-shaped positioning shaft (66) is inserted into the follower shaft (611), and the lower end of the positioning shaft (66) passes through the lower spring (67) and is inserted and fixed on the lifting platform (9), and the lifting platform (9) is fixedly connected with a vertical U-shaped longitudinal section. A guide seat (65), a through hole (651) is formed in the middle of the guide seat (65), a follower shaft (611) is inserted into the through hole (651), vertical limit columns (63) are fixedly connected to the lower end surfaces of the support plates (61) on the left and right sides of the follower shaft (611), and a ball (64) is embedded in the lower end of the limit column (63), and the ball (64) rests on the upper surface of the guide seat (65); the lifting platform (9) is arranged on the bottom plate (1) and drives the follower bearing seat (6) to move up and down.

2. The automatic welding device for bicycles according to claim 1, characterized in that: The automatic welding device is loaded with a bicycle frame component (10), the frame component (10) comprising a vertical stand pipe (101) and a horizontal longitudinal and tubular middle shaft seat (102), the middle shaft seat (102) being placed on a support plate (61), the stand pipe (101) being inserted into a guide sleeve (3), the lower end of the guide sleeve (3) being in the form of an arc surface and being in contact with the outer wall of the upper side of the middle shaft seat (102); the upper pressing head (512) of the rotary pressing assembly (5) being inserted into and pressed against the top of the stand pipe (101); An automatic wire feeding welder is arranged at the rear side of the automatic welding device, and a welding gun nozzle on the automatic wire feeding welder is tiltedly mounted on the rear side of the stand pipe (101) and faces the connection between the stand pipe (101) and the middle shaft seat (102).

3. The automatic welding device for bicycles according to claim 2, characterized in that: The diameter of the outer wall of the vertical tube (101) is smaller than the diameter of the outer wall of the central axis seat (102); the central axis of the vertical tube (101), the central axis of the follower shaft (611) and the central axis of the positioning shaft (66) coincide with each other; the guide seat (65) is composed of a semicircular guide panel at the upper end and two sets of vertical plates at the lower end, the arc radius of the upper surface of the guide panel is equal to the radius of the outer wall of the central axis seat (102), and the center distance from the ball (64) to the follower shaft (611) is equal to the radius of the outer wall of the vertical tube (101).

4. The automatic welding device for bicycles according to claim 2, characterized in that: The lower end of the rotating column sleeve (411) on the rotating arm assembly (4) is connected to the support column (2) through a bearing, and a T-shaped long bolt (42) is inserted into the rotating column sleeve (411), and the lower end of the long bolt (42) extends out of the rotating column sleeve (411) and is screwed into the support column (2); The third gear (43) is fixedly connected to the rotating column sleeve (411) by a sleeve, and the fourth gear (43) is meshed with the third gear (43); an L-shaped bracket plate (46) is fixedly connected to the outer wall of the top of the long bolt (42), the lower end of the bracket plate (46) is fixedly connected to the connecting arm (31), a vertical rotating motor (45) is fixedly connected to the bracket plate (46), and the fourth gear (43) is fixedly connected to the rotating shaft of the rotating motor (45) by a sleeve.

5. The automatic welding device for bicycles according to claim 2, characterized in that: The diameter of the inner wall of the guide sleeve (3) is equal to the diameter of the outer wall of the vertical pipe (101); the lifting platform (9) comprises a rectangular lifting platform (91), and T-shaped guide columns (92) are inserted at the four corners of the lifting platform (91), and the lower ends of the guide columns (92) are fixedly connected to the bottom plate (1); the follower bearing seat (6) is located in the middle and rear parts of the lifting platform (91), and the left and right sides of the front part of the lifting platform (91) are fixedly connected with vertical lifting cylinders (93), and the piston rod of the lifting cylinder (93) passes through the lifting platform (91) and is fixedly connected to the bottom plate (1).

6. The automatic welding device for bicycles according to claim 5, characterized in that: A feeding mechanism (7) is arranged on the lifting platform (91) between the lifting cylinders (93), and the feeding mechanism (7) comprises a longitudinal arc-shaped material trough plate (71). A longitudinal feeding cylinder (73) is arranged on the front side of the material trough plate (71). A material trough support frame (72) is fixedly connected to the material trough plate (71), and the lower end of the material trough support frame (72) is fixedly connected to the lifting platform (91). The feeding cylinder (73) is fixedly connected to the material trough support frame (72), and the piston rod of the feeding cylinder (73) is inserted into the material trough plate (71) and is fixedly connected to a push plate.

7. The automatic welding device for bicycles according to claim 5, characterized in that: The rear end of the support plate (61) is fixedly connected to a baffle (62), the rear end of the central axis seat (102) abuts against the baffle (62), and the distance between the lifting platform (91) and the bottom plate (1) is greater than the distance from the top of the vertical pipe (101) to the lower end surface of the guide sleeve (3); A toggle assembly (8) is provided between the vertical pipe (101) and the support column (2), and the toggle assembly (8) comprises a vertical side plate (81), the upper end of the side plate (81) is fixedly connected to the connecting arm (31), and the lower end is plugged with a transverse T-shaped toggle rod (82), and the end of the toggle rod (82) is plugged and fixed with a spherical toggle head (83), and a compression spring (84) is inserted and sleeved on the toggle rod (82), one end of the compression spring (84) is pressed against the side plate (81), and the other end is pressed against the toggle head (83), and the toggle head (83) is elastically pressed against the outer wall of the vertical pipe (101).

8. The automatic welding device for bicycles according to claim 1, characterized in that: The connecting seat (54) is composed of a sealing plate at the top and a cylinder at the middle and lower parts. The diameter of the inner wall of the connecting seat (54) is larger than the diameter of the spline shaft (55). Windows (541) are formed on the outer walls of both sides of the cylinder on the connecting seat (54).

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