Bicycle frame assembling and welding tool for horizontally clamping lower fork pipe

Abstract

A bicycle frame assembling and welding tool capable of horizontally clamping a lower fork pipe comprises a front triangular component positioning and clamping mechanism, an upper and lower fork pipe positioning and clamping mechanism, a lug positioning and clamping mechanism and a base. A five-way pipe positioning and clamping assembly in the front triangular part positioning and clamping mechanism is assembled with the base, and a vertical pipe positioning and clamping assembly and the five-way pipe positioning and clamping assembly are assembled through a pin shaft and fixed through a lock pin; an upper fork pipe positioning and clamping assembly and a lower fork pipe positioning assembly in the upper and lower fork pipe positioning and clamping mechanism are both installed on a supporting stand column, and the supporting stand column is assembled with a base. The height of the lug positioning and clamping assembly is consistent with the height of the lower fork pipe positioning assembly and the height of the five-way pipe positioning and clamping assembly so that a lower fork pipe can be clamped in the horizontal state, the lug positioning and clamping assembly is assembled with the supporting frame through the front-back moving unit, and the supporting frame is assembled with the base. By adopting the technical means, the purposes of reducing the workpiece positioning and clamping difficulty and improving the working efficiency and the welding product quality are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycle production equipment, in particular to a bicycle frame assembly welding tool with horizontal clamping of lower fork tubes. BACKGROUND

[0002] As shown in the accompanying drawings, Figure 1 , Figure 2 A bicycle frame is composed of a front triangular part 1 and a rear triangular part 2. The assembly welding process for the bicycle frame is as follows: first, welding of the front triangular part 1, welding of the upper fork tube assembly (the upper fork tube assembly includes two left and right upper fork tubes 2-1 and an upper fork tube connecting short horizontal tube 2-4) in the rear triangular part 2, and welding of the connection parts of the lower fork tube 2-2 and the two groups of ear pieces 2-3 in the rear triangular part 2; then welding of the middle stand tube 1-1 and the five-way tube 1-2 in the front triangular part 1 with the upper fork tube assembly and the lower fork tube 2-2 in the rear triangular part 2, respectively, and welding of the connection parts of the upper fork tube assembly and the two groups of ear pieces 2-3, thereby forming a bicycle frame assembly. According to the assembly requirements of the bicycle product, the center distance L between the five-way tube 1-2 of the front triangular part 1 and the rear axle assembly slot 2-3-1 in the rear triangular part 2 must be a set value during the assembly welding of the bicycle frame.

[0003] In the traditional bicycle frame assembly welding tool, at least two sets of positioning and clamping mechanisms for the front triangular part 1 are provided, and the middle stand tube 1-1 in the front triangular part 1 is usually clamped in a vertical state. The workpiece is positioned and clamped with the five-way tube 1-2 as the positioning reference, and the upper fork tube assembly and the lower fork tube 2-2 in the rear triangular part 2 are clamped at a set angle. Since the positioning reference needs to be converted during the clamping process of the upper fork tube assembly and the lower fork tube 2-2, there is a problem of error accumulation, which makes it difficult to ensure the welding precision. SUMMARY

[0004] The present application provides a bicycle frame assembly welding tool with horizontal clamping of lower fork tubes, which realizes clamping and positioning of the lower fork tubes in a horizontal state through cooperation of the front triangular part positioning and clamping mechanism, the upper and lower fork tube positioning and clamping mechanism, the ear piece positioning and clamping mechanism, and the base. A movable ear piece positioning seat is arranged in the ear piece positioning and clamping mechanism to facilitate the loading and unloading operation of the workpiece, thereby achieving the purposes of reducing the positioning and clamping difficulty of the workpiece, improving the welding operation efficiency and the welding product quality.

[0005] To achieve the above purposes, the present application adopts the following technical solutions: A bicycle frame assembly welding tool with horizontal clamping of lower fork tubes, comprising a front triangular part positioning and clamping mechanism, an upper and lower fork tube positioning and clamping mechanism, an ear piece positioning and clamping mechanism, and a base. The front triangular part positioning and clamping mechanism comprises a five-way pipe positioning and clamping assembly and a vertical pipe positioning and clamping assembly, the five-way pipe positioning and clamping assembly is matched with the base, and the vertical pipe positioning and clamping assembly is assembled with the five-way pipe positioning and clamping assembly through a pin shaft and is fixed by a lock pin. The upper and lower fork pipe positioning and clamping mechanism comprises an upper fork pipe positioning and clamping assembly, a lower fork pipe positioning assembly and a supporting column, the upper fork pipe positioning and clamping assembly and the lower fork pipe positioning assembly are both installed on the supporting column, and the supporting column is matched with the base. The ear piece positioning and clamping mechanism is provided with an ear piece positioning and clamping assembly, a front and rear moving unit and a supporting frame, the ear piece positioning and clamping assembly is consistent in height with the lower fork pipe positioning assembly and the five-way pipe positioning and clamping assembly, the lower fork pipe is clamped in a horizontal state, the ear piece positioning and clamping assembly is assembled with the supporting frame through the front and rear moving unit, and the supporting frame is matched with the base.

[0006] The above-mentioned bicycle frame assembly and welding tool with the lower fork pipe clamped horizontally, the lower fork pipe positioning assembly of the upper and lower fork pipe positioning and clamping mechanism comprises a first limiting column, a first limiting column front and rear position adjusting sliding block, a second limiting column and a lower fork pipe positioning seat, the lower fork pipe positioning seat is a cantilever beam structure extending forward, the rear end of the lower fork pipe positioning seat is assembled with the supporting column, the second limiting column and the first limiting column front and rear position adjusting sliding block are matched on the lower fork pipe positioning seat, and the first limiting column is installed on the first limiting column front and rear position adjusting sliding block.

[0007] The above-mentioned bicycle frame assembly and welding tool with the lower fork pipe clamped horizontally, the first limiting column and the second limiting column both comprise two parts arranged symmetrically left and right, and two limiting column units for limiting the left and right lower fork pipes are respectively arranged in each part.

[0008] The above-mentioned bicycle frame assembly and welding tool with the lower fork pipe clamped horizontally, the upper fork pipe positioning and clamping assembly of the upper and lower fork pipe positioning and clamping mechanism comprises an upper fork pipe limiting horizontal pipe, an upper fork pipe limiting horizontal pipe front and rear adjusting sliding block, an upper fork pipe pressing clamp and an upper fork pipe positioning seat, the upper fork pipe positioning seat is a cantilever beam structure extending forward, the rear end of the upper fork pipe positioning seat is assembled with the supporting column, and the upper fork pipe limiting horizontal pipe front and rear adjusting sliding block is matched on the upper fork pipe positioning seat, the upper fork pipe limiting horizontal pipe is fixed on the upper fork pipe limiting horizontal pipe front and rear adjusting sliding block, flaps are arranged at both ends of the upper fork pipe limiting horizontal pipe, the upper fork pipe pressing clamp is installed on the supporting column and located above the upper fork pipe positioning seat, and the upper fork pipe pressing clamp is a downward pressing clamp, and the downward pressing head is a horizontally arranged pressing rod.

[0009] The ear piece positioning and clamping assembly of the ear piece positioning and clamping mechanism of the bicycle frame assembly welding tool with the lower fork tube horizontally clamped comprises an ear piece pressing clamp and an ear piece pressing clamp mounting seat; the ear piece pressing clamp mounting seat is a left-right symmetrical structure, two ear piece pressing convex platforms are arranged in the middle part of the ear piece pressing clamp mounting seat, and positioning pin holes are arranged on the ear piece pressing convex platforms; the ear piece pressing clamps are arranged in two groups in a left-right symmetrical mode, and are mounted at the left and right ends of the ear piece pressing clamp mounting seat; the two groups of ear piece pressing clamps are side pushing type pressing clamps with opposite pressing heads, positioning pins are arranged on the side pressing heads of the ear piece pressing clamps, and the positioning pins can pass through the rear shaft assembly grooves on the ear pieces and enter the positioning pin holes on the ear piece pressing convex platforms.

[0010] The support frame of the ear piece positioning and clamping mechanism of the bicycle frame assembly welding tool with the lower fork tube horizontally clamped comprises a support frame base and a U-shaped seat; the support frame base is an inverted T-shaped seat structure, the U-shaped seat is fixed to the top end of the vertical wall of the support frame base, and a front-rear movement unit is arranged on the U-shaped seat.

[0011] The front-rear movement unit of the ear piece positioning and clamping mechanism of the bicycle frame assembly welding tool with the lower fork tube horizontally clamped comprises a driving element and a guide element; the driving element is a side pushing type clamp mounted on the rear wall of the U-shaped seat, and the driving arm of the side pushing type clamp is fixedly connected with the ear piece pressing clamp mounting seat; the guide element comprises a sliding block and a guide column, the guide column is mounted on the side wall of the U-shaped seat, and the sliding block is fixed to the bottom of the pressing clamp mounting seat.

[0012] The five-way pipe positioning and clamping assembly of the front triangular component positioning and clamping mechanism of the bicycle frame assembly welding tool with the lower fork tube horizontally clamped comprises a U-shaped mounting seat, a five-way pipe positioning seat and a five-way pipe pressing clamp; the bottom surface of the U-shaped mounting seat is assembled with the base, and the five-way pipe positioning seat is assembled on the inner side wall of the U-shaped mounting seat; the five-way pipe pressing clamp is mounted on the outer side wall of the U-shaped mounting seat and is a side pushing type pressing clamp, and the side pressing head of the five-way pipe pressing clamp is arranged opposite to the five-way pipe positioning seat.

[0013] The stand pipe positioning and clamping assembly of the front triangular component positioning and clamping mechanism of the bicycle frame assembly welding tool with the lower fork tube horizontally clamped comprises an angle adjustment seat, a stand pipe positioning block and a stand pipe pressing clamp; the angle adjustment seat is hingedly assembled with the inner side wall of the U-shaped mounting seat of the five-way pipe positioning and clamping assembly, an arc-shaped long hole is arranged on the angle adjustment seat, and the angle adjustment seat is fixed with the inner side wall of the U-shaped mounting seat through a lock pin penetrating through the arc-shaped long hole; the stand pipe positioning block is assembled with the angle adjustment seat, and the stand pipe pressing clamp is assembled on the stand pipe positioning block; the stand pipe pressing clamp is a side pressing type pressing clamp, and the stand pipe is pressed and fixed through the side pressing head of the stand pipe pressing clamp.

[0014] The bicycle frame assembly welding tool with horizontal clamping of lower fork pipes, the upper plane of the base is provided with slide rails with front and rear through structures along the central axis, and a plurality of assembly holes are arranged on the left and right sides of the slide rails; the bottom surface of the U-shaped mounting seat in the front triangular component positioning and clamping mechanism, the bottom surface of the support stand column in the upper and lower fork pipe positioning and clamping mechanism, and the bottom surface of the support frame in the ear piece positioning and clamping mechanism are all provided with slide grooves matched with the slide rails of the base and long holes matched with the assembly holes.

[0015] The bicycle frame assembly welding tool with horizontal clamping of lower fork pipes, the upper plane of the base is provided with slide rails with front and rear through structures along the central axis, and a plurality of assembly holes are arranged on the left and right sides of the slide rails; the bottom surface of the U-shaped mounting seat in the front triangular component positioning and clamping mechanism, the bottom surface of the support stand column in the upper and lower fork pipe positioning and clamping mechanism, and the bottom surface of the support frame in the ear piece positioning and clamping mechanism are all provided with slide grooves matched with the slide rails of the base and long holes matched with the assembly holes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of a bicycle frame structure to which the present application is applicable; Figure 2 is a K-direction view of Figure 1 Figure 3 is a schematic view of the overall structure of the present application; Figure 4 is a K-direction view of Figure 3 Figure 5 is a schematic view of a front triangular component positioning and clamping mechanism; Figure 6 is a schematic view of an upper and lower fork pipe positioning and clamping mechanism; Figure 7 is a schematic view of an ear piece positioning and clamping mechanism; Figure 8 is a K-direction view of Figure 7 ​​schematic diagram of the working state of the present application after rotation around a vertical axis; Figure 9 is a schematic diagram of the working state of the present application; Figure 10 is Figure 9 K view of the present application.

[0017] Explanation of the various reference numerals in the drawings: 1 is a front triangular component, 1-1 is a vertical pipe, and 1-2 is a five-way pipe; 2 is a rear triangular component, 2-1 is an upper fork pipe, 2-2 is a lower fork pipe, 2-3 is an ear piece, 2-3-1 is a rear shaft assembly groove, and 2-4 is an upper fork pipe connecting short cross pipe; 3 is a front triangular component positioning and clamping mechanism 3-1 is a five-way pipe positioning and clamping assembly, 3-1-1 is a U-shaped mounting seat, 3-1-2 is a five-way pipe pressing clamp, and 3-1-3 is a five-way pipe positioning seat, 3-2 is a locking pin 3-3 is a vertical pipe positioning and clamping assembly, 3-3-1 is an angle adjustment seat, 3-3-1-1 is a circular arc-shaped long hole, 3-3-2 is a vertical pipe pressing clamp, and 3-3-3 is a vertical pipe positioning block; 4 is an upper and lower fork pipe positioning and clamping mechanism 4-1 is a supporting column 4-2 is a lower fork pipe positioning assembly, 4-2-1 is a first limiting column, 4-2-2 is a first limiting column front and rear adjustment sliding block, 4-2-3 is a second limiting column, and 4-2-4 is a lower fork pipe positioning seat, 4-3 is an upper fork pipe positioning and clamping assembly, 4-3-1 is an upper fork pipe limiting cross pipe, 4-3-2 is an upper fork pipe limiting cross pipe front and rear adjustment sliding block, 4-3-3 is an upper fork pipe positioning seat, and 4-3-4 is an upper fork pipe pressing clamp; 5 is an ear piece positioning and clamping mechanism 5-1 is a supporting frame, 5-1-1 is a supporting frame base, and 5-1-2 is a U-shaped seat, 5-2 is an ear piece positioning and clamping assembly, 5-2-1 is an ear piece pressing clamp mounting seat, 5-2-2 is an ear piece pressing clamp, and 5-2-3 is an ear piece pressing convex platform, 5-3 is a front and rear moving unit, 5-3-1 is a side pushing type clamp, 5-3-2 is a guide column, and 5-3-3 is a sliding block; 6 is a base, 6-1 is a sliding rail, and 6-2 is an assembly hole. DETAILED DESCRIPTION

[0018] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0019] Referring to FIG. 1, Figure 2A bicycle frame is composed of a front triangle part 1 and a rear triangle part 2, and the welding production process for the bicycle frame is as follows: firstly, welding of the front triangle part 1, welding of the upper fork tube assembly (including left and right two upper fork tubes 2-1 and an upper fork tube connecting short horizontal tube 2-4) in the rear triangle part 2, and welding of the lower fork tube 2-2 of the rear triangle part 2 and two groups of lug 2-3 connecting parts are completed, then the upper fork tube assembly of the front triangle part 1 and the rear triangle part 2, the lower fork tube 2-2, and the connecting parts of the upper fork tube assembly and the two groups of lug 2-3 are welded, thereby forming a bicycle frame assembly.

[0020] Referring to Figure 3 、 Figure 4 In order to reduce the difficulty of workpiece positioning and clamping, improve the work efficiency of welding operation and the quality of welding products, the present application provides a bicycle frame welding tool with horizontal clamping of lower fork tube, which comprises a front triangle part positioning and clamping mechanism 3, an upper and lower fork tube positioning and clamping mechanism 4, a lug positioning and clamping mechanism 5 and a base 6; the front triangle part positioning and clamping mechanism 3, the upper and lower fork tube positioning and clamping mechanism 4, the lug positioning and clamping mechanism 5 and the base 6 are matched; a front and rear through structure sliding rail 6-1 is arranged on the upper surface of the base 6 along the central axis, and a plurality of assembly holes 6-2 are arranged on the left and right sides of the sliding rail 6-1, the front triangle part positioning and clamping mechanism 3, the upper and lower fork tube positioning and clamping mechanism 4 and the lug positioning and clamping mechanism 5 can move forward and backward along the sliding rail 6-1 on the base 6, and precise position adjustment and locking are realized through the long hole matched with the assembly hole 6-2 on the base 6.

[0021] Referring to Figure 3 、 Figure 4 、 Figure 5The front triangular part positioning and clamping mechanism 3 of the bicycle frame assembly welding tool includes a five-way pipe positioning and clamping assembly 3-1 and a vertical pipe positioning and clamping assembly 3-3. The five-way pipe positioning and clamping assembly 3-1 includes a U-shaped mounting seat 3-1-1, a five-way pipe positioning seat 3-1-3 and a five-way pipe pressing clamp 3-1-2. The bottom surface of the U-shaped mounting seat 3-1-1 is assembled with the base 6, and the five-way pipe positioning seat 3-1-3 is assembled on the inner side wall of the U-shaped mounting seat 3-1-1. The five-way pipe pressing clamp 3-1-2 is installed on the outer side wall of the U-shaped mounting seat 3-1-1, which is a side pushing type pressing clamp, and the side pressing head thereof is arranged opposite to the five-way pipe positioning seat 3-1-3. The vertical pipe positioning and clamping assembly 3-3 includes an angle adjusting seat 3-3-1, a vertical pipe positioning block 3-3-3 and a vertical pipe pressing clamp 3-3-2. The angle adjusting seat 3-3-1 is hingedly assembled with the inner side wall of the U-shaped mounting seat 3-1-1 of the five-way pipe positioning and clamping assembly 3-1. An arc-shaped long hole 3-3-1-1 is arranged on the angle adjusting seat 3-3-1, and the angle adjusting seat 3-3-1 is fixed with the inner side wall of the U-shaped mounting seat 3-1-1 through a lock pin 3-2 penetrating through the arc-shaped long hole 3-3-1-1. The vertical pipe positioning block 3-3-3 is assembled with the angle adjusting seat 3-3-1. A positioning groove matching the outer surface of the vertical pipe 1-1 is arranged on the vertical pipe positioning block 3-3-3, and the vertical pipe pressing clamp 3-3-2 is assembled on the vertical pipe positioning block 3-3-3. The vertical pipe pressing clamp 3-3-2 is a side pressing type pressing clamp, and the side wall of the vertical pipe 1-1 is pressed and fixed through the side pressing head thereof.

[0022] Referring to Figure 3 , Figure 4 , Figure 6 The upper and lower fork pipe positioning and clamping mechanism 4 of the bicycle frame assembly welding tool includes an upper fork pipe positioning and clamping assembly 4-3, a lower fork pipe positioning assembly 4-2 and a supporting column 4-1. The lower fork pipe positioning assembly 4-2 includes a first limiting column 4-2-1, a first limiting column front and rear position adjusting sliding block 4-2-2, a second limiting column 4-2-3 and a lower fork pipe positioning seat 4-2-4. The lower fork pipe positioning seat 4-2-4 is a cantilever beam structure extending forward, and the rear end thereof is assembled with the supporting column 4-1. The second limiting column 4-2-3 and the first limiting column front and rear position adjusting sliding block 4-2-2 are assembled on the lower fork pipe positioning seat 4-2-4. The first limiting column 4-2-1 is installed on the first limiting column front and rear position adjusting sliding block 4-2-2. The first limiting column 4-2-1 and the second limiting column 4-2-3 each include two parts arranged symmetrically left and right, and two limiting column units limiting the left and right two lower fork pipes 2-2 are arranged in each part.

[0023] Still referring to Figure 3 , Figure 4 , Figure 6The upper fork tube positioning and clamping assembly 4-3 of the upper fork tube positioning and clamping mechanism 4 of the bicycle frame assembly welding tool comprises an upper fork tube limiting transverse tube 4-3-1, an upper fork tube limiting transverse tube front and rear adjusting sliding block 4-3-2, an upper fork tube pressing clamp 4-3-4 and an upper fork tube positioning seat 4-3-3; the upper fork tube positioning seat 4-3-3 is a forwardly extending cantilever beam structure, the rear end of which is assembled with the support column 4-1, and the upper fork tube limiting transverse tube front and rear adjusting sliding block 4-3-2 is arranged on the upper fork tube positioning seat 4-3-3; the upper fork tube limiting transverse tube 4-3-1 is fixed on the upper fork tube limiting transverse tube front and rear adjusting sliding block 4-3-2, and flaps are arranged at the two ends of the upper fork tube limiting transverse tube 4-3-1; the upper fork tube pressing clamp 4-3-4 is installed on the support column 4-1 and located above the upper fork tube positioning seat 4-3-3, and is a downward pressing clamp, and the downward pressing head is a transversely arranged pressing rod.

[0024] Referring to Figure 3 , Figure 4 , Figure 7 , Figure 8 The ear piece positioning and clamping mechanism 5 of the lower fork tube horizontal clamping bicycle frame assembly welding tool comprises an ear piece positioning and clamping assembly 5-2, a front and rear moving unit 5-3 and a support frame 5-1, wherein the ear piece positioning and clamping assembly 5-2 is consistent in height with the lower fork tube positioning assembly 4-2 and the five-way tube positioning and clamping assembly 3-1, so that the lower fork tube 2-2 can be clamped in a horizontal state. The ear piece positioning and clamping assembly 5-2 comprises an ear piece pressing clamp 5-2-2 and an ear piece pressing clamp mounting seat 5-2-1; the ear piece pressing clamp mounting seat 5-2-1 is a left-right symmetrical structure, two upwardly extending ear piece pressing bosses 5-2-3 are arranged in the middle of the ear piece pressing clamp mounting seat 5-2-1, and positioning pin holes are arranged on the ear piece pressing bosses 5-2-3; the ear piece pressing clamp 5-2-2 is arranged in two groups in a left-right symmetrical manner, is installed at the left and right ends of the ear piece pressing clamp mounting seat 5-2-1, and is a side pushing type pressing clamp with opposite pressing heads; positioning pins are arranged on the side pressing heads of the ear piece pressing clamp 5-2-2, the positioning pins can pass through the rear shaft assembly groove 2-3-1 of the ear piece 2-3 and enter the positioning pin holes of the ear piece pressing bosses 5-2-3, the ear piece 2-3 can be positioned through the positioning pins, and the ear piece 2-3 can be pressed and fixed through the side pressing heads of the ear piece pressing clamp 5-2-2. The support frame 5-1 comprises a support frame base 5-1-1 and a U-shaped seat 5-1-2, the support frame base 5-1-1 is an inverted T-shaped seat structure, the U-shaped seat 5-1-2 is fixed at the top end of the vertical wall of the support frame base 5-1-1, and the front and rear moving unit 5-3 is arranged on the U-shaped seat 5-1-2. The front and back moving unit 5-3 comprises a driving element and a guiding element, the driving element is a side push type clamp 5-3-1, the driving arm of the side push type clamp 5-3-1 is fixedly connected with the ear piece compression clamp mounting seat 5-2-1, the guiding element comprises a sliding block 5-3-3 and a guiding column 5-3-2, the guiding column 5-3-2 is installed on the side wall of the U-shaped seat 5-1-2, and the sliding block 5-3-3 is fixed at the bottom of the compression clamp mounting seat 5-2-1.

[0025] Referring to Figures 1 to 10, when the first piece of a certain batch of bicycle frames is assembled and welded, first, the relative assembly positions of the front triangular part positioning and clamping mechanism 3, the upper and lower fork tube positioning and clamping mechanism 4, the ear piece positioning and clamping mechanism 5 and the base 6 are adjusted according to the size specifications of the workpiece to be welded, the positional relationship between the stand tube positioning and clamping assembly 3-3 and the five-way tube positioning and clamping assembly 3-1 in the front triangular part positioning and clamping mechanism 3 is adjusted (including the height position of the stand tube positioning block 3-3-3 and the included angle between the angle adjustment seat 3-3-1 and the U-shaped mounting seat 3-1-1), the height of the lower fork tube positioning seat 4-2-4 in the upper and lower fork tube positioning and clamping mechanism 4 is adjusted, the height of the ear piece positioning and clamping assembly 5-2 is made consistent with that of the lower fork tube positioning assembly 4-2 and the five-way tube positioning and clamping assembly 3-1, the upper fork tube positioning seat 4-3-3 in the upper and lower fork tube positioning and clamping mechanism 4 is adjusted to a suitable position, and the above adjustments are made so that the center distance L between the five-way tube 1-2 of the front triangular part 1 and the rear axle assembly groove 2-3-1 on the ear piece 2-3 of the rear triangular part 2 meets the set value requirement, and the adjustment of the positions of the components of the application is completed; then the ear piece positioning and clamping assembly 5-2 is moved backward by the forward and backward moving unit 5-3 in the ear piece positioning and clamping mechanism 5 to avoid the ear piece 2-3 which is welded with the lower fork tube 2-2 on the workpiece during feeding, the front triangular part 1 is placed in the front triangular part positioning and clamping mechanism 3, the two ends of the five-way tube 1-2 of the front triangular part 1 are pressed by the five-way tube positioning and clamping assembly 3-1, and the stand tube 1-2 of the front triangular part 1 is pressed by the stand tube pressing assembly 3-3, so that the front triangular part 1 is fixed, the lower fork tube 2-2 of the rear triangular part 2 is placed on the lower fork tube positioning assembly 4-2 of the upper and lower fork tube positioning and clamping mechanism 4, the ear piece positioning and clamping assembly 5-2 is moved forward by the forward and backward moving unit 5-3 in the ear piece positioning and clamping mechanism 5, the ear piece pressing clamp 5-2-2 is operated, the positioning pin on the pressing head is inserted through the positioning pin hole on the ear piece 2-3 and the ear piece pressing convex platform 5-2-3 to position the ear piece 2-3, the ear piece 2-3 is pressed and fixed by the pressing head of the ear piece pressing clamp 5-2-2, the upper fork tube assembly rear end insertion slot (after the upper fork tube assembly is assembled and welded, the insertion slot is formed at the rear end of the left and right rear fork tubes 2-2 to cooperate with the ear piece 2-3) is inserted into the left and right ear pieces 2-3, the upper fork tube assembly front end is loaded on the upper fork tube limiting horizontal tube 4-3-1, the upper fork tube pressing clamp 4-3-4 is closed, and the left and right upper fork tubes 2-1 are pressed by the horizontally arranged pressing rods at the pressing head part of the upper fork tube pressing clamp 4-3-4; whether the center distance L between the five-way tube 1-2 of the front triangular part 1 and the rear axle assembly groove 2-3-1 on the ear piece 2-3 of the rear triangular part 2 meets the set value requirement is measured, if L meets the set value requirement, welding operation is started, if L does not meet the set value requirement, the above adjustment process is repeated until L meets the set value requirement, and welding operation is performed.The base 6 of the present application can be connected with the output shaft of the indexing machine of the welding station. During the welding operation, when the welding operation of one side of the workpiece is completed, the present application and the workpiece are turned over by 180 degrees by the indexing machine of the welding station, and the welding process of the other side of the workpiece is started, so as to meet the full welding process requirement of the welding position. After the welding operation of the first workpiece of a batch of bicycle frames is completed, if the product meets the relevant parameter requirements after inspection, batch production can be carried out on the present application.

Claims

1. A bicycle frame welding fixture for horizontally clamping the lower fork tube, characterized by: It comprises a front triangle component positioning and clamping mechanism (3), an upper and lower fork tube positioning and clamping mechanism (4), an ear piece positioning and clamping mechanism (5) and a base (6); The front triangle component positioning and clamping mechanism (3) comprises a five-way tube positioning and clamping assembly (3-1) and a seat tube positioning and clamping assembly (3-3); the five-way tube positioning and clamping assembly (3-1) is assembled with a base (6); the seat tube positioning and clamping assembly (3-3) and the five-way tube positioning and clamping assembly (3-1) are assembled via a pin and fixed by a locking pin (3-2); The upper and lower fork tube positioning and clamping mechanisms (4) comprise an upper fork tube positioning and clamping assembly (4-3), a lower fork tube positioning assembly (4-2), and a support column (4-1); the upper fork tube positioning and clamping assembly (4-3) and the lower fork tube positioning assembly (4-2) are both mounted on the support column (4-1); and the support column (4-1) is assembled with a base (6); The ear piece positioning and clamping mechanism (5) is provided with an ear piece positioning and clamping assembly (5-2), a front-back moving unit (5-3) and a support frame (5-1). The ear piece positioning and clamping assembly (5-2) is at the same height as the lower fork tube positioning assembly (4-2) and the five-way tube positioning and clamping assembly (3-1), so that the lower fork tube (2-2) is clamped in a horizontal state. The ear piece positioning and clamping assembly (5-2) is assembled with the support frame (5-1) through the front-back moving unit (5-3), and the support frame (5-1) is assembled with the base (6).

2. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 1, characterized in that: The lower fork tube positioning assembly (4-2) of the upper and lower fork tube positioning and clamping mechanism (4) comprises a first limiting column (4-2-1), a first limiting column front and rear adjustment slider (4-2-2), a second limiting column (4-2-3) and a lower fork tube positioning seat (4-2-4); the lower fork tube positioning seat (4-2-4) is a cantilever beam structure extending forward, the rear end of which is assembled with the supporting column (4-1); the second limiting column (4-2-3) and the first limiting column front and rear position adjustment slider (4-2-2) are mounted on the lower fork tube positioning seat (4-2-4); the first limiting column (4-2-1) is mounted on the first limiting column front and rear position adjustment slider (4-2-2).

3. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 2, characterized in that: The first limiting column (4-2-1) and the second limiting column (4-2-3) both comprise two parts that are symmetrically arranged on the left and right sides, and two limiting column units for limiting the left and right lower fork tubes (2-2) are respectively provided in each part.

4. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 3, characterized in that: The upper fork tube positioning and clamping assembly (4-3) of the upper and lower fork tube positioning and clamping mechanism (4) comprises an upper fork tube limiting transverse tube (4-3-1), an upper fork tube limiting transverse tube front and rear adjustment slider (4-3-2), an upper fork tube clamping clamp (4-3-4) and an upper fork tube positioning seat (4-3-3); the upper fork tube positioning seat (4-3-3) is a cantilever beam structure extending forward, the rear end of which is assembled with the support column (4-1), and a support is provided on the upper fork tube positioning seat (4-3-3). A front-rear adjustment slider (4-3-2) of the upper fork tube limiting cross tube is installed; the upper fork tube limiting cross tube (4-3-1) is fixed on the front-rear adjustment slider (4-3-2) of the upper fork tube limiting cross tube, and blocking pieces are provided at both ends of the upper fork tube limiting cross tube (4-3-1); the upper fork tube pressing clamp (4-3-4) is installed on the supporting column (4-1), is located above the upper fork tube positioning seat (4-3-3), and is a downward pressing clamp, the downward pressing head of which is a horizontally arranged pressure rod.

5. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 4, characterized in that: The ear piece positioning clamping assembly (5-2) of the ear piece positioning clamping mechanism (5) comprises an ear piece pressing clamp (5-2-2) and an ear piece pressing clamp mounting seat (5-2-1); the ear piece pressing clamp mounting seat (5-2-1) is a bilaterally symmetrical structure, with two ear piece pressing bosses (5-2-3) provided in the middle thereof, and positioning pin holes provided on the ear piece pressing bosses (5-2-3); the ear piece pressing clamps (5-2-2) are arranged in two groups symmetrically on the left and right sides and are installed at the left and right ends of the ear piece pressing clamp mounting seat (5-2-1); the two groups of ear piece pressing clamps (5-2-2) are side-pushing type pressing clamps with opposing pressure heads, and positioning pins are provided on the side pressure heads thereof, and the positioning pins can pass through the rear axle assembly groove (2-3-1) on the ear piece (2-3) and enter the positioning pin holes on the ear piece pressing bosses (5-2-3).

6. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 5, characterized in that: The support frame (5-1) of the ear piece positioning and clamping mechanism (5) comprises a support frame base (5-1-1) and a U-shaped seat (5-1-2); the support frame base (5-1-1) is an inverted T-shaped seat structure, the U-shaped seat (5-1-2) is fixed at the top end of its vertical wall, and a front-rear moving unit (5-3) is mounted on the U-shaped seat (5-1-2).

7. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 6, characterized in that: The forward and backward moving unit (5-3) includes a driving element and a guiding element; the driving element is a side-push caliper (5-3-1) mounted on the rear side wall of the U-shaped seat (5-1-2), and the driving arm of the side-push caliper (5-3-1) is fixedly connected to the earpiece pressing clamp mounting seat (5-2-1); the guiding element includes a slider (5-3-3) and a guide column (5-3-2), the guide column (5-3-2) is mounted on the side wall of the U-shaped seat (5-1-2), and the slider (5-3-3) is fixed to the bottom of the pressing clamp mounting seat (5-2-1).

8. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 4, characterized in that: The bottom tube positioning and clamping assembly (3-1) of the front triangle component positioning and clamping mechanism (3) comprises a U-shaped mounting seat (3-1-1), a bottom tube positioning seat (3-1-3) and a bottom tube pressing clamp (3-1-2); the bottom surface of the U-shaped mounting seat (3-1-1) is assembled with the base (6), and the bottom tube positioning seat (3-1-3) is assembled on the inner side wall of the U-shaped mounting seat (3-1-1); the bottom tube pressing clamp (3-1-2) is mounted on the outer side wall of the U-shaped mounting seat (3-1-1) and is a side-push type pressing clamp, with its side pressure head arranged opposite to the bottom tube positioning seat (3-1-3).

9. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 8, characterized in that: The seat tube positioning and clamping assembly (3-3) of the front triangle component positioning and clamping mechanism (3) comprises an angle adjustment seat (3-3-1), a seat tube positioning block (3-3-3) and a seat tube pressing clamp (3-3-2); the angle adjustment seat (3-3-1) is hingedly assembled with the inner side wall of the U-shaped mounting seat (3-1-1) of the bottom bracket tube positioning and clamping assembly (3-1); an arc-shaped long hole (3-3-1-1) is provided on the angle adjustment seat (3-3-1) ), and is fixed to the inner wall of the U-shaped mounting seat (3-1-1) by a locking pin (3-2) passing through the arc-shaped long hole (3-3-1-1); the standpipe positioning block (3-3-3) is matched with the angle adjustment seat (3-3-1), and a standpipe pressing clamp (3-3-2) is assembled on the standpipe positioning block (3-3-3); the standpipe pressing clamp (3-3-2) is a side-pressure type pressing clamp, which presses and fixes the standpipe (1-1) through its side pressure head.

10. The bicycle frame welding fixture for horizontally clamping the lower fork tube according to claim 8, characterized in that: The upper plane of the base (6) is provided with a slide rail (6-1) with a front-to-back through structure along the central axis, and a plurality of assembly holes (6-2) are provided on the left and right sides of the slide rail (6-1); the bottom surface of the U-shaped mounting seat (3-1-1) in the front triangle component positioning and clamping mechanism (3), the bottom surface of the support column (4-1) in the upper and lower fork tube positioning and clamping mechanism (4), and the bottom surface of the support frame (5-1) in the ear piece positioning and clamping mechanism (5) are all provided with a slide groove that cooperates with the slide rail (6-1) on the base (6) and a long hole that cooperates with the assembly hole (6-2).

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