Bicycle frame welding tool

Abstract

A bicycle frame welding tool comprises a base, a front mounting seat, a U-shaped mounting seat, a rear triangular middle section support and a rear mounting seat are sequentially arranged on the base from front to back, the front mounting seat is connected with a head pipe positioning and clamping mechanism, and the U-shaped mounting seat is connected with a vertical pipe positioning and clamping mechanism. The rear triangular middle section support is connected with a rear triangular middle positioning and clamping mechanism with the adjustable height and angle, the rear installation base is connected with a tail positioning and clamping mechanism, and a connecting plate is fixedly arranged at the front end of the base in the mode of being perpendicular to the base and used for connecting the base with a positioner. The bicycle frame welding tool structure is optimally designed, so that the bicycle frame welding tool is coordinated and matched with an automatic welding robot, and the purposes of accurately clamping and positioning and improving the production efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to a welding tool, in particular to a bicycle frame welding tool. Background Art

[0002] In modern life, bicycles are becoming increasingly popular as a green means of transportation. To meet people's diverse lifestyle needs, bicycle manufacturers have produced bicycles of different specifications and models, such as adult bicycles, children's bicycles, mountain bikes, road bikes, and so on. The bicycle frame is a key component of a bicycle. In the production workshop, the frame components are welded together to ensure smooth welding and quality. Welding of the bicycle frame often requires welding tooling to position and clamp the frame components. Because bicycles come in many different specifications and models, bicycle frames also vary in shape and size. Each specification and model of bicycle frame requires its own dedicated welding tooling. This not only increases bicycle production support costs but also makes production site management difficult. Utility Model Content

[0003] The utility model provides a bicycle frame welding tool, which aims to match bicycle frames of different specifications and models through the optimization design of the welding tool structure dedicated to bicycle frames, and at the same time conform to the operation of robot welding guns, so as to achieve the purpose of reducing bicycle production auxiliary costs, improving production efficiency and reducing the difficulty of production site management.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bicycle frame welding tool comprises a base (1), wherein the base (1) is provided with a front mounting seat (9-1), a U-shaped mounting seat (9-2), a rear triangle middle section support (8) and a rear mounting seat (5) in sequence from front to back, the front mounting seat (9-1) is connected to a head tube positioning clamping mechanism (9-3), the U-shaped mounting seat (9-2) is connected to a seat tube positioning clamping mechanism (9-5), the rear triangle middle section support (8) is connected to a rear triangle middle section positioning clamping mechanism (7) that is adjustable in height and angle, the rear mounting seat (5) is connected to a tail section positioning clamping mechanism (6), and a connecting plate (10) is fixedly provided at the front end of the base (1) perpendicular to the base (1) for connecting the base (1) to a positioner (11).

[0006] The above-mentioned bicycle frame welding tooling, the base (1) is provided with multiple groups of positioning threaded holes (1-1), and corresponding positioning threaded holes (1-1) are provided on the front mounting seat (9-1), the U-shaped mounting seat (9-2), the rear triangular middle section support (8), and the rear mounting seat (5) to match them.

[0007] The above-mentioned bicycle frame welding tool, the front mounting seat (9-1) is detachably fixedly connected to the head tube positioning clamping device (9-3); the head tube positioning clamping device (9-3) includes a head tube positioning seat (9-31), a connecting seat (9-32), a sliding seat (9-33), and a head tube clamp (9-34); a plurality of groups of connecting threaded holes are provided on the vertical mounting plate of the front mounting seat (9-1), the sliding seat (9-33) is provided with connecting holes adapted to the connecting threaded holes, the sliding seat (9-33) is fixedly connected to the front mounting seat (9-1), and a horizontal sliding pair is provided between the sliding seat (9-33) and the connecting seat (9-32); the mounting base of the head tube clamp (9-34) is fixedly connected to the sliding seat (9-33), and the telescopic end of the head tube clamp (9-34) is connected to the connecting seat ( The head tube positioning seat (9-31) is fixedly connected to the connecting seat (9-32), and the head tube positioning seat (9-31) and the connecting seat (9-32) are detachably fixedly connected; the head tube positioning seat (9-31) comprises a positioning support block (9-311) and an articulated connecting seat (9-312), the articulated connecting seat (9-312) and the connecting seat (9-32) are detachably fixedly connected, the articulated connecting seat (9-312) and the positioning support block (9-311) are articulatedly connected, and the head tube A in the front triangle (2) of the bicycle frame is positioned by the V-shaped groove of the positioning support block (9-311), and the head tube clamp (9-34) and the connecting seat (9-32) are slidably connected back and forth relative to the sliding seat (9-33), so that the head tube positioning seat (9-31) can position, press or release the head tube A in the front triangle (2) of the bicycle frame.

[0008] The above-mentioned bicycle frame welding tool is provided with a bottom-to-top arrangement of a five-way tube positioning and clamping mechanism (9-4) and a seat tube positioning and clamping mechanism (9-5) on the U-shaped mounting seat (9-2). A pair of horizontal clamps are symmetrically provided from outside to inside on the lower part of the two side vertical edges of the U-shaped mounting seat (9-2) to position, clamp or release the five-way tube in the front triangle (2) of the bicycle frame. The seat tube positioning and clamping mechanism (9-5) includes a seat tube positioning seat (9-51) and a seat tube clamping device ( 9-52), a side edge of the U-shaped mounting seat (9-2) extends vertically upward to form a mounting plate, and the mounting plate is provided with multiple groups of positioning bolt connection holes from bottom to top, the riser positioning seat (9-51) is an embrace ring with an open and close structure, the riser positioning seat (9-52) and the mounting plate are detachably fixed, the pressure head of the riser clamp (9-52) is coaxially arranged with the embrace ring, and the mounting base of the riser clamp (9-52) is detachably fixed to the mounting plate.

[0009] The above-mentioned bicycle frame welding tooling, the rear triangle middle section support (8) is an L-shaped bracket, the vertical surface of the rear triangle middle section support (8) is provided with a vertical slide groove (8-1), the rear triangle middle section positioning clamping mechanism (7) is detachably fixedly connected to the rear triangle middle section support (8) after being rotated to a suitable angle at any height position of the slide groove (8-1) by rotating the connecting bolt (12); the rear mounting seat (5) includes a guide fixing column (5-1) perpendicular to the base (1) and a guide fixing column (5-1) slidably placed on the guide fixing column (5-1) The tail support (5-2) is mounted on the guide fixing column (5-1), and multiple groups of threaded holes (5-5) are symmetrically arranged on the left and right sides from bottom to top. The tail support (5-2) is provided with a sliding sleeve (5-3), and the sliding sleeve (5-3) is provided with a connecting hole (5-4) matching the threaded hole (5-5). The sliding sleeve (5-3) is slidably connected up and down along the guide fixing column (5-1), driving the tail positioning clamping mechanism (6) to move up and down in the height direction to a suitable height position and then be fixedly connected to the guide fixing column (5-1).

[0010] The above-mentioned bicycle frame welding tooling, the rear triangle middle positioning clamping mechanism (7) includes an upper pressure block (7-1), a lower support (7-2), and a clamp (7-3), the front and rear facades of the lower support (7-2) are respectively provided with a pair of positioning plates (7-21) with adjustable left and right positions, the positioning plates (7-21) are provided with positioning grooves consistent with the rear triangle upper fork (4) or the rear triangle lower fork (3) of the bicycle frame, the middle part of the lower support (7-2) is provided with a second vertical threaded hole (7-22), the middle part of the right side of the lower support (7-2) is provided with a horizontal threaded hole (7-23) matching the rotating connecting bolt (12), and the rotating connecting bolt (12) passes through the slide groove (8-1 ) is screwed into the threaded hole (7-23) to fix the lower support (7-2) and the rear triangle middle support (8), the clamp (7-3) comprises a cam (7-31) and a connecting shaft (7-32), the lower end of the connecting shaft (7-32) is threadedly connected to the lower support (7-2), the upper end of the connecting shaft (7-32) vertically upwardly passes through the upper pressing block (7-1) and is hingedly connected to the cam tightener (7-31), the cam surface of the cam (7-31) abuts against the upper surface of the upper pressing block (7-1), and the cam (7-31) is rotated to press down or lift the upper pressing block (7-1), thereby tightening or loosening the rear triangle upper fork (4) or the rear triangle lower fork (3) of the bicycle frame.

[0011] The above-mentioned bicycle frame welding tooling, the tail positioning clamping mechanism (6) includes a tail positioning shaft (6-1), a support plate (6-2), a positioning shaft shoulder section (6-3), and a tail clamping device (6-4). The core of the tail support (5-2) is provided with a horizontal cylindrical hole that passes through the left and right sides. The tail positioning shaft (6-1) is rotated in the cylindrical hole. The two ends of the tail positioning shaft (6-1) pass through the tail support (5-2) and extend to the left and right to form positioning shaft shoulder sections (6-3). The positioning shaft shoulder section (6-3) is provided with a A shaft flat section matching the rear shaft hooking groove of the ear piece (13) is provided, a telescopic connection pair (6-5) is provided between the positioning shaft shoulder section (6-3) and the tail positioning shaft (6-1) to adapt to the different spacings between the left and right ear pieces (13), the left and right side surfaces of the tail support (5-2) are detachably fixedly connected to the support plate (6-2), the support plate (6-2) is detachably fixedly connected to the tail clamping device (6-4), and the pressure head of the tail clamping device (6-4) presses down or lifts up to tighten or loosen the ear piece (13).

[0012] In the above-mentioned bicycle frame welding tool, the five-way tube positioning and clamping mechanism (9-4) is provided with a positioning and clamping piece (9-4-1) that matches the five-way tube in the front triangle (2) of the bicycle frame, and a through hole (9-4-11) is provided on the positioning and clamping piece (9-4-1). When the five-way tube positioning and clamping mechanism (9-4) positions and clamps the front triangle (2) of the bicycle frame, the internal gas of the five-way tube is connected to the external environment.

[0013] The bicycle frame welding tool is characterized in that the base (1) is provided with guide rails (1-2) in the front-rear direction, and each bracket detachably fixedly connected to the base (1) is provided with a guide groove that is slidably matched with the guide rails (1-2) and is fixed via a positioning threaded hole (1-1).

[0014] The utility model relates to a bicycle frame welding tool, which is particularly suitable for welding with a robot welding gun to weld and assemble the front triangle and the rear triangle upper fork and lower fork of the bicycle frame into an integral bicycle frame, thereby realizing assembly, welding, positioning and clamping adapted to bicycle frames of various specifications, facilitating adjustment of bicycle frame parts of different lengths and different inclination angles, improving the versatility and flexible production of the bicycle frame welding tool, reducing the number of special welding tools for different types of bicycle frames, reducing the auxiliary cost of bicycle production and the difficulty of production site management, reducing the high auxiliary cost of bicycle production, and greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the welding product;

[0016] Figure 2A schematic structural diagram of the utility model;

[0017] Figure 3 yes Figure 2 Enlarged view of the middle AA section;

[0018] Figure 4 yes Figure 2 Enlarged view of the middle BB section;

[0019] Figure 5 It is the overall axonometric drawing of the utility model;

[0020] Figure 6 yes Figure 5 A partial enlarged view of middle D;

[0021] Figure 7 yes Figure 5 A partial enlarged view of E in the middle.

[0022] The list of reference numbers in the figure is:

[0023] 1. Base, 1-1. Positioning threaded hole, 1-2. Guide rail, 2. Front triangle of bicycle frame, 2-1. Five-way tube, 3. Lower fork of rear triangle of bicycle frame, 4. Upper fork of rear triangle of bicycle frame, 5. Rear mounting seat, 5-1. Guide fixing column, 5-2. Tail support, 5-3. Sliding sleeve, 5-4. Connecting hole, 5-5. Threaded hole five, 6. Tail positioning clamping mechanism, 6-1 Tail positioning shaft, 6-2. Support plate, 6-3. Positioning shaft shoulder section, 6-4. Tail clamping device, 6-5 Telescopic pair, 7. Positioning clamping mechanism of middle part of rear triangle, 7-1. Upper pressure block, 7-2. Lower support, 7 -21, positioning plate, 7-22, threaded hole 2, 7-23, threaded hole, 7-3, clamp, 7-31, cam, 7-32, connecting shaft, 8, rear triangle middle section support, 8-1, slide groove, 9-1, front mounting seat, 9-2, U-shaped bracket, 9-3, head tube positioning clamping mechanism, 9-311, positioning support block, 9-312, articulated connecting seat, 9-4, bottom bracket tube positioning clamping mechanism, 9-4-1, positioning clamping plate, 9-4-11, through hole, 9-5, seat tube positioning clamping mechanism 10, connecting plate, 11, positioner, 12, rotating connecting bolt, 13, ear piece.

[0024] A. Head tube, B. Seat tube. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] See Figure 1 、 Figure 2 、 Figure 4 、 Figure 5The present invention provides a bicycle frame welding tool, comprising a base 1. The base 1 is provided with a front mounting seat 9-1, a U-shaped bracket 9-2, a rear triangle middle section support 8, and a rear mounting seat 5 in sequence from front to back. The front mounting seat 9-1 is connected to a head tube positioning and clamping mechanism 9-3, the U-shaped mounting seat 9-2 is connected to a seat tube positioning and clamping mechanism 9-5, the rear triangle middle section support 8 is connected to a rear triangle middle section positioning and clamping mechanism 7 that is adjustable in height and angle, and the rear mounting seat 5 is connected to a tail positioning and clamping mechanism 6. A connecting plate 10 is fixedly provided at the front end of the base 1 perpendicular to the base 1 for connecting the base 1 to a positioner 11. The base 1 is provided with a plurality of positioning threaded holes 1-1, which match the corresponding positioning threaded holes 1-1 provided on the front mounting seat 9-1, the U-shaped mounting seat 9-2, the rear triangle middle section support 8, and the rear mounting seat 5.

[0027] See Figure 1 、 Figure 5 、 Figure 7 The front mounting seat 9-1 of the present invention is detachably fixedly connected to the head tube positioning and clamping device 9-3; the head tube positioning and clamping device 9-3 includes a head tube positioning seat 9-31, a connecting seat 9-32, a sliding seat 9-33, and a head tube clamp 9-34; a plurality of groups of connecting threaded holes are provided on the vertical mounting plate of the front mounting seat 9-1, and the sliding seat (9-33) is provided with connecting holes adapted to the connecting threaded holes, and the sliding seat 9-33 is fixedly connected to the front mounting seat 9-1, and a horizontal sliding pair is provided between the sliding seat 9-33 and the connecting seat 9-32, and the mounting base of the head tube clamp 9-34 is fixedly connected to the sliding seat 9-33, and the telescopic end of the head tube clamp 9-34 is connected to the connecting seat 9 -32 is fixedly connected, and the head tube positioning seat 9-31 and the connecting seat 9-32 are detachably fixedly connected; the head tube positioning seat 9-31 includes a positioning support block 9-311 and an articulated connecting seat 9-312, and the articulated connecting seat 9-312 and the connecting seat 9-32 are detachably fixedly connected, and the articulated connecting seat 9-312 is articulatedly connected to the positioning support block 9-311, and the head tube A in the front triangle 2 of the bicycle frame is positioned by the V-groove of the positioning support block 9-311, and the head tube clamp 9-34 and the connecting seat 9-32 are slidably connected back and forth relative to the sliding seat 9-33, so that the head tube positioning seat 9-31 can position, press or loosen the head tube A in the front triangle 2 of the bicycle frame.

[0028] See Figure 1 、 Figure 2 , Figure 5 、 Figure 6 、 Figure 7The U-shaped mounting seat 9-2 of the present invention is provided with a five-way tube positioning and clamping mechanism 9-4 and a seat tube positioning and clamping mechanism 9-5 in sequence from bottom to top, and a pair of horizontal clamps are symmetrically provided on the lower part of the two side edges of the U-shaped mounting seat 9-2 from the outside to the inside, so as to position, clamp or loosen the five-way tube in the front triangle 2 of the bicycle frame; the seat tube positioning and clamping mechanism 9-5 includes a seat tube positioning seat 9-51 and a seat tube clamping device 9-52, one side edge of the U-shaped mounting seat 9-2 extends vertically upward to form a mounting plate, and the mounting plate is provided with multiple groups of positioning bolt connecting holes from bottom to top, the seat tube positioning seat 9-51 is an opening and closing structure of the holding ring, the seat tube positioning seat 9-52 is detachably fixed to the mounting plate, the pressure head of the seat tube clamp 9-52 is coaxially arranged with the holding ring, and the mounting base of the seat tube clamp 9-52 is detachably fixed to the mounting plate.

[0029] See Figure 2 、 Figure 3 The rear triangle middle section support 8 of the present invention is an L-shaped bracket, and the vertical surface of the rear triangle middle section support 8 is provided with a vertical slide groove 8-1, and the rear triangle middle positioning clamping mechanism 7 is detachably fixedly connected to the rear triangle middle section support 8 by rotating the connecting bolt 12 at any height position of the slide groove 8-1 to a suitable angle; the rear mounting seat 5 includes a guide fixing column 5-1 perpendicular to the base 1 and a tail support 5-2 slidably placed on the guide fixing column 5-1, and the left and right sides of the guide fixing column 5-1 are symmetrically provided with multiple groups of threaded holes 5-5 from bottom to top, and the tail support 5-2 is provided with a sliding sleeve 5-3, and the sliding sleeve 5-3 is provided with a connecting hole 5-4 matching the threaded hole 5-5, and the sliding sleeve 5-3 is connected to the guide fixing column 5-1 by sliding up and down, driving the tail positioning clamping mechanism (6) to move up and down in the height direction to a suitable height position and then be fixedly connected to the guide fixing column (5-1).

[0030] See Figure 2 、 Figure 4The rear triangle middle positioning and clamping mechanism 7 of the present invention includes an upper pressure block 7-1, a lower support 7-2, and a clamp 7-3. The front and rear facades of the lower support 7-2 are respectively provided with a pair of left and right position-adjustable positioning pieces 7-21. The positioning pieces 7-21 are provided with positioning grooves that are consistent with the rear triangle upper fork 4 or the rear triangle lower fork 3 of the bicycle frame. A vertical threaded hole 7-22 is provided in the middle of the lower support 7-2. A horizontal threaded hole 7-23 is provided in the middle of the right side of the lower support 7-2 to match the rotating connecting bolt 12. The rotating connecting bolt 12 passes through the slide groove 8- 1 is screwed into the threaded hole 7-23 to fix the lower support 7-2 with the rear triangle middle support 8. The clamp 7-3 includes a cam 7-31 and a connecting shaft 7-32. The lower end of the connecting shaft 7-32 is threadedly connected to the lower support 7-2. The upper end of the connecting shaft 7-32 vertically upward passes through the upper pressing block 7-1 and is hingedly connected to the cam 7-31. The cam surface of the cam 7-31 abuts against the upper surface of the upper pressing block 7-1. Rotating the cam 7-31 presses down or lifts the upper pressing block 7-1, thereby tightening or loosening the rear triangle upper fork 4 or the rear triangle lower fork 3 of the bicycle frame.

[0031] See Figure 2 、 Figure 3 The tail positioning and clamping mechanism 6 of the present invention includes a tail positioning shaft 6-1, a support plate 6-2, a positioning shaft shoulder section 6-3, and a tail clamping device 6-4. The core of the tail support 5-2 is provided with a horizontal cylindrical hole that passes through the left and right sides. The tail positioning shaft 6-1 is rotated in the cylindrical hole. The two ends of the tail positioning shaft 6-1 pass through the tail support 5-2 and extend to the left and right to form a positioning shaft shoulder section 6-3. The positioning shaft shoulder section 6-3 is provided with a groove for hooking with the rear axle of the ear piece 13. A matching shaft flat section, a telescopic connection pair 6-5 is set between the positioning shaft shoulder section 6-3 and the tail positioning shaft 6-1 to adapt to the different spacings between the left and right ear pieces 13, and the tail clamping device 6-4 is a vertical quick clamp; the left and right side surfaces of the tail support 5-2 are detachably fixedly connected to the support plate 6-2, and the support plate 6-2 is detachably fixedly connected to the tail clamping device 6-4, and the pressure head of the tail clamping device 6-4 presses down or lifts up to tighten or loosen the ear piece 13.

[0032] See Figure 6 The bottom tube positioning and clamping mechanism 9-4 described in the present invention is provided with a positioning and clamping plate 9-4-1 that matches the bottom tube in the front triangle 2 of the bicycle frame. A through hole 9-4-11 is provided on the positioning and clamping plate 9-4-1. When the bottom tube positioning and clamping mechanism 9-4 positions and clamps the front triangle 2 of the bicycle frame, the internal gas of the bottom tube is connected to the external environment.

[0033] See Figure 4 The base 1 of the present invention is provided with guide rails 1-2 in the front and rear directions, and each bracket detachably fixedly connected to the base 1 is provided with a guide groove that slides with the guide rail 1-2 and is fixed by a positioning threaded hole 1-1.

[0034] See Figures 1 to 7 The utility model is a bicycle frame welding tool, which is suitable for welding with a robot welding gun. The front triangle of the bicycle frame and the upper fork and lower fork of the rear triangle of the bicycle frame are welded and assembled into an integral bicycle frame, so as to realize the assembly, welding, positioning and clamping of bicycle frames of various specifications, and facilitate the adjustment of bicycle frame parts of different lengths and different inclination angles, thereby improving the versatility and flexible production of the bicycle frame welding tool, reducing the number of special welding tool for different types of bicycle frames, reducing the auxiliary cost of bicycle production and the difficulty of production site management, reducing the high auxiliary cost of bicycle production, and greatly improving production efficiency.

Claims

1. A bicycle frame welding tool, characterized in that: The invention comprises a base (1), wherein the base (1) is detachably fixedly connected to a front mounting seat (9-1), a U-shaped mounting seat (9-2), a rear triangle middle section support (8) and a rear mounting seat (5) in sequence from front to back, wherein the front mounting seat (9-1) is connected to a head tube positioning clamping mechanism (9-3), the U-shaped mounting seat (9-2) is connected to a seat tube positioning clamping mechanism (9-5), the rear triangle middle section support (8) is connected to a rear triangle middle section positioning clamping mechanism (7) whose height and angle are adjustable, and the rear mounting seat (5) is connected to a tail section positioning clamping mechanism (6). A connecting plate (10) is fixedly provided at the front end of the base (1) perpendicular to the base (1) for connecting the base (1) to a positioner (11).

2. The bicycle frame welding tool according to claim 1, characterized in that: The base (1) is provided with a plurality of groups of positioning threaded holes (1-1), and the front mounting seat (9-1), the U-shaped mounting seat (9-2), the rear triangular middle section support (8), and the rear mounting seat (5) are all provided with positioning threaded holes (1-1) that match the base (1).

3. The bicycle frame welding tool according to claim 1, characterized in that: The front mounting seat (9-1) is detachably fixedly connected to a head tube positioning and clamping device (9-3); the head tube positioning and clamping device (9-3) comprises a head tube positioning seat (9-31), a connecting seat (9-32), a sliding seat (9-33), and a head tube clamp (9-34); a plurality of groups of connecting threaded holes are provided on the vertical mounting plate of the front mounting seat (9-1); the sliding seat (9-33) is provided with connecting holes adapted to the connecting threaded holes, the sliding seat (9-33) is fixedly connected to the front mounting seat (9-1), and a horizontal sliding pair is provided between the sliding seat (9-33) and the connecting seat (9-32); the mounting base of the head tube clamp (9-34) is fixedly connected to the sliding seat (9-33), and the telescopic end of the head tube clamp (9-34) is fixedly connected to the connecting seat (9-32). The head tube positioning seat (9-31) and the connecting seat (9-32) are detachably fixedly connected; the head tube positioning seat (9-31) comprises a positioning support block (9-311) and an articulated connecting seat (9-312); the articulated connecting seat (9-312) and the connecting seat (9-32) are detachably fixedly connected; the articulated connecting seat (9-312) and the connecting seat (9-32) are articulatedly connected to the positioning support block (9-311); the head tube A in the front triangle (2) of the bicycle frame is positioned through the V-shaped groove of the positioning support block (9-311); the head tube clamp (9-34) is operated to be slidably connected to the connecting seat (9-32) relative to the sliding seat (9-33) to drive the head tube positioning seat (9-31) to position, press or release the head tube in the front triangle (2) of the bicycle frame.

4. The bicycle frame welding tool according to claim 1, wherein: The U-shaped mounting seat (9-2) is provided with a five-way tube positioning and clamping mechanism (9-4) and a seat tube positioning and clamping mechanism (9-5) in sequence from bottom to top. A pair of horizontal clamps are symmetrically provided from outside to inside at the lower part of the two side vertical edges of the U-shaped mounting seat (9-2) to position, clamp or release the five-way tube in the front triangle (2) of the bicycle frame; the seat tube positioning and clamping mechanism (9-5) comprises a seat tube positioning seat (9-51) and a seat tube clamping device (9-52); one side vertical edge of the U-shaped mounting seat (9-2) extends vertically upward to form a mounting plate; the mounting plate is provided with multiple groups of positioning bolt connection holes from bottom to top; the seat tube positioning seat (9-51) is an embracing ring with an open-close structure; the seat tube clamping device (9-52) is detachably fixed to the mounting plate; the pressure head of the seat tube clamping device (9-52) is coaxially arranged with the embracing ring; and the mounting base of the seat tube clamping device (9-52) is detachably fixed to the mounting plate.

5. The bicycle frame welding tool according to claim 1, wherein: The rear triangle middle section support (8) is an L-shaped bracket, and a vertical slide groove (8-1) is provided on the vertical surface of the rear triangle middle section support (8). The rear triangle middle section positioning clamping mechanism (7) is detachably fixedly connected to the rear triangle middle section support (8) after being rotated to a suitable angle at any height position of the slide groove (8-1) by rotating the connecting bolt (12); the rear mounting seat (5) includes a guide fixing column (5-1) perpendicular to the base (1) and a tail support slidably placed on the guide fixing column (5-1). (5-2), a plurality of groups of threaded holes five (5-5) are symmetrically arranged on the left and right sides of the guide fixing column (5-1) from bottom to top, the tail support (5-2) is provided with a sliding sleeve (5-3), the sliding sleeve (5-3) is provided with a connecting hole (5-4) matching the threaded hole five (5-5), the sliding sleeve (5-3) slides up and down along the guide fixing column (5-1), drives the tail positioning clamping mechanism (6) to move up and down along the height direction to a suitable height position, and then is fixedly connected with the guide fixing column (5-1).

6. The bicycle frame welding tool according to claim 5, characterized in that: The rear triangle middle positioning and clamping mechanism (7) comprises an upper pressing block (7-1), a lower support (7-2), and a clamp (7-3). A pair of left-right position-adjustable positioning pieces (7-21) are respectively provided on the front and rear facades of the lower support (7-2). Positioning grooves that are consistent with the rear triangle upper fork (4) or the rear triangle lower fork (3) of the bicycle frame are provided on the positioning pieces (7-21). A second vertical threaded hole (7-22) is provided in the middle of the lower support (7-2). A horizontal threaded hole (7-23) is provided in the middle of the right side of the lower support (7-2) to match the rotating connecting bolt (12). The rotating connecting bolt (12) passes through the slide groove (8-1) and is rotated to the lower fork. The threaded hole (7-23) is used to fix the lower support (7-2) and the rear triangle middle support (8). The clamp (7-3) includes a cam (7-31) and a connecting shaft (7-32). The lower end of the connecting shaft (7-32) is threadedly connected to the lower support (7-2). The upper end of the connecting shaft (7-32) vertically passes through the upper pressing block (7-1) and is hinged to the cam (7-31). The cam surface of the cam (7-31) abuts against the upper surface of the upper pressing block (7-1). The cam (7-31) is rotated to press down or lift the upper pressing block (7-1), thereby tightening or loosening the rear triangle upper fork (4) or the rear triangle lower fork (3) of the bicycle frame.

7. The bicycle frame welding tool according to claim 5, characterized in that: The tail positioning clamping mechanism (6) comprises a tail positioning shaft (6-1), a support plate (6-2), a positioning shaft shoulder section (6-3), and a tail clamping device (6-4). The core of the tail support (5-2) is provided with a horizontal cylindrical hole that passes through the left and right sides. The tail positioning shaft (6-1) is rotated in the cylindrical hole. Both ends of the tail positioning shaft (6-1) pass through the tail support (5-2) and extend to the left and right to form positioning shaft shoulder sections (6-3). The positioning shaft shoulder section (6-3) is provided with a lug (1 3) of the rear axle hook groove, a telescopic connection pair (6-5) is provided between the positioning shoulder section (6-3) and the tail positioning shaft (6-1) to adapt to the different spacings between the left and right ear pieces (13), the left and right side surfaces of the tail support (5-2) are detachably fixedly connected to the support plate (6-2), the support plate (6-2) is detachably fixedly connected to the tail clamping device (6-4), and the pressure head of the tail clamping device (6-4) presses down or lifts up to tighten or loosen the ear piece (13).

8. The bicycle frame welding tool according to claim 7, characterized in that: The tail clamping device (6-4) is a vertical quick clamp.

9. The bicycle frame welding tool according to claim 4, wherein: The five-way tube positioning and clamping mechanism (9-4) is provided with a positioning and clamping piece (9-4-1) that matches the five-way tube in the front triangle (2) of the bicycle frame. The positioning and clamping piece (9-4-1) is provided with a plurality of through holes (9-4-11). When the five-way tube positioning and clamping mechanism (9-4) positions and clamps the front triangle (2) of the bicycle frame, the internal gas of the five-way tube is connected to the external environment.

10. The bicycle frame welding tool according to claim 5, wherein: The base (1) is provided with guide rails (1-2) in the front-rear direction, and each bracket detachably fixedly connected to the base (1) is provided with a guide groove for slidingly cooperating with the guide rails (1-2).

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