A welding fixture for bicycle frame assembly with a cross-shaped support frame

Abstract

A bicycle frame welding fixture with a cross-shaped support frame includes a base, a front triangle component positioning and clamping mechanism, and a rear triangle component positioning and clamping mechanism. The base is equipped with both the front and rear triangle component positioning and clamping mechanisms. The front triangle component positioning and clamping mechanism includes a bottom bracket clamping assembly and a riser clamping assembly. The bottom bracket clamping assembly is fitted to the base, and the riser clamping assembly and bottom bracket clamping assembly are assembled via pins and secured with locking pins. The rear triangle component positioning and clamping mechanism includes an upper fork tube positioning and clamping assembly, a lower fork tube positioning and clamping assembly, and a cross-shaped support frame assembly. The upper and lower fork tube positioning and clamping assemblies are assembled with the cross-shaped support frame assembly, which is fitted to the base. This invention meets welding technical parameter requirements, simplifies the welding fixture structure, and improves the dimensional accuracy of welded products.

Description

Technical Field

[0001] This utility model relates to the field of bicycle production equipment technology, specifically to a bicycle frame welding fixture with a cross-shaped support frame. Background Technology

[0002] As attached Figure 1 , Figure 2 As shown, a bicycle frame consists of a front triangle component 1 and a rear triangle component 2. The assembly and welding process for this bicycle frame is as follows: First, the front triangle component 1 is welded; then, the upper fork tube assembly (which includes two upper fork tubes 2-1 on the left and right sides and a short cross tube 2-4 connecting the upper fork tubes) in the rear triangle component 2 is welded; and finally, the lower fork tube 2-2 of the rear triangle component 2 is welded to the connection points of the two sets of lugs 2-3. Then, the riser tube 1-1 and bottom bracket tube 1-2 in the front triangle component 1 are welded to the upper fork tube assembly and lower fork tube 2-2 of the rear triangle component 2, respectively. At the same time, the upper fork tube assembly is welded to the connection points of the two sets of lugs 2-3, thereby forming the bicycle frame assembly.

[0003] According to the assembly requirements of bicycle products, during the welding of the bicycle frame, the center distance L between the bottom bracket 1-2 of the front triangle component 1 and the rear axle mounting groove 2-3-1 on the lug 2-3 of the rear triangle component 2 must be a set value. Traditional bicycle frame welding fixtures typically have two sets of positioning and clamping mechanisms for the front triangle component 1, and corresponding positioning and clamping mechanism mounting seats on the base for each component of the rear triangle component 2. This results in a complex welding fixture structure, a large number of parts, and the problem of error accumulation, which affects the dimensional accuracy of the welded product. Utility Model Content

[0004] This utility model provides a bicycle frame welding fixture with a cross-shaped support frame. Through the cooperation of the front triangle component positioning and clamping mechanism, the rear triangle component positioning and clamping mechanism and the base, it ensures that the technical parameters of the bicycle frame meet the relevant requirements after welding. The upper fork tube positioning and clamping components and the lower fork tube positioning and clamping components of the rear triangle component positioning and clamping mechanism are arranged on the cross-shaped support frame assembly to simplify the welding fixture structure and improve the dimensional accuracy of the welded products.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bicycle frame welding fixture with a cross-shaped support frame includes a base, a front triangle component positioning and clamping mechanism, and a rear triangle component positioning and clamping mechanism.

[0007] One end of the base is connected to the rotating shaft of the welding station indexing machine, and a front triangular component positioning and clamping mechanism and a rear triangular component positioning and clamping mechanism are assembled on the base.

[0008] The front triangular component positioning and clamping mechanism includes a bottom pipe clamping assembly and a riser clamping assembly. The bottom pipe clamping assembly is fitted with the base. The riser clamping assembly and the bottom pipe clamping assembly are assembled by a pin and fixed by a locking pin.

[0009] The rear triangular component positioning and clamping machine includes an upper fork tube positioning and clamping assembly, a lower fork tube positioning and clamping assembly, and a cross-shaped support frame assembly. The upper fork tube positioning and clamping assembly and the lower fork tube positioning and clamping assembly are both mounted on the cross-shaped support frame assembly, and the cross-shaped support frame assembly is fitted with the base.

[0010] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes a cross-shaped support frame assembly for the rear triangle component positioning and clamping mechanism. This cross-shaped support frame assembly comprises a cross, a T-shaped mounting base, an upper fork tube bracket assembly base, and a lug positioning pin seat. The cross is mounted on the base via the T-shaped mounting base. The upper fork tube bracket assembly base and the lug positioning pin seat are both mounted on the vertical beam of the cross, located above the cross beam. The lug positioning pin seats are symmetrically arranged on both sides of the vertical beam of the cross.

[0011] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes an upper fork tube positioning and clamping assembly for the rear triangle component positioning and clamping mechanism. The upper fork tube bracket is hinged to the upper fork tube bracket mounting seat of the cross-shaped support frame assembly and fixed by a bolt assembly. A horizontal tube for supporting the upper fork tube is provided at the front end of the upper fork tube bracket. The upper fork tube clamping clamp is installed on the upper fork tube bracket and clamps and fixes the upper fork tube by a transversely arranged long pressure head.

[0012] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes a lower fork tube positioning and clamping assembly of the rear triangle component positioning and clamping mechanism, comprising a lower fork tube bracket, lower fork tube limiting posts, and a lower fork tube positioning unit. One end of the lower fork tube bracket is fixed to the vertical beam of the cross, located below the cross beam, and two sets of lower fork tube limiting posts are symmetrically arranged on the left and right sides of the other end of the lower fork tube bracket. The lower fork tube positioning unit includes a wedge-shaped support block, a support block push rod, and a side-push caliper. The wedge-shaped support block is fixed to one end of the support block push rod, and the side-push caliper is installed on the back of the cross beam, with its driven arm passing through the cross beam and connected to the other end of the support block push rod by a threaded connection.

[0013] The aforementioned bicycle frame welding fixture with a cross-shaped support frame has a long groove on the lower fork tube bracket for adjusting the left and right positions of the lower fork tube limiting post. The lower fork tube limiting post is assembled with the lower fork tube bracket by bolts passing through the long groove.

[0014] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes a wedge-shaped support block sliding rail for the lower fork tube positioning and clamping assembly. The wedge-shaped support block sliding rail is fixed on the lower fork tube bracket, and a groove that mates with the wedge-shaped support block sliding rail is provided on the bottom surface of the wedge-shaped support block.

[0015] The aforementioned bicycle frame assembly welding fixture with a cross-shaped support frame includes a lower fork tube positioning and clamping assembly that also includes a lug clamping clamp. The lug clamping clamp is a side-push type clamping clamp, which is arranged at both ends of the cross beam. The clamping head cooperates with the lug positioning pin seat installed on the cross to clamp and fix the left and right lugs.

[0016] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes a bottom bracket clamping assembly for the front triangle component positioning and clamping mechanism, comprising a U-shaped mounting base, a bottom bracket positioning pin seat, and a bottom bracket clamping clamp. The bottom surface of the U-shaped mounting base is assembled with the base, and the bottom bracket positioning pin seat is mounted on the inner wall of the U-shaped mounting base. An arc-shaped long groove is formed on the inner wall of the U-shaped mounting base, and the arc-shaped long groove is located above the bottom bracket positioning pin seat. The bottom bracket clamping clamp is mounted on the outer wall of the U-shaped mounting base and is a side-push clamping clamp, with its clamping head arranged opposite to the bottom bracket positioning pin seat.

[0017] The aforementioned bicycle frame welding fixture with a cross-shaped support frame includes a vertical pipe clamping assembly for the front triangle component positioning and clamping mechanism, comprising a vertical arm, a vertical pipe clamping clamp mounting base, and a vertical pipe clamping clamp. The vertical arm is hinged to the inner wall of the U-shaped mounting base of the bottom bracket clamping assembly and fixed to the inner wall of the U-shaped mounting base by a locking pin passing through the arc-shaped long groove. The vertical pipe clamping clamp mounting base is fitted with the vertical arm, and the vertical pipe clamping clamp is mounted on the vertical pipe clamping clamp mounting base. The vertical pipe clamping clamp is a downward clamping clamp, which clamps and fixes the upper end of the vertical pipe through its clamping head.

[0018] The aforementioned bicycle frame welding fixture with a cross-shaped support frame has a slide rail with a front-to-back through structure on the upper surface of the base along the central axis, and several sets of assembly holes on the left and right sides of the slide rail; the bottom surface of the U-shaped mounting seat in the front triangular component positioning and clamping mechanism and the bottom surface of the T-shaped mounting seat in the rear triangular component positioning and clamping mechanism are provided with a sliding groove that mates with the base slide rail and an elongated hole that mates with the assembly holes.

[0019] This utility model provides a bicycle frame welding fixture with a cross-shaped support frame. Since the welding of the front triangle component is completed before the welding of the front and rear triangle components, the front triangle component is treated as a single unit. Therefore, the bottom bracket clamping assembly and the stem clamping assembly of the front triangle component positioning and clamping mechanism can achieve positioning and clamping of the front triangle component. In the rear triangle component positioning and clamping machine of this utility model, the upper fork tube positioning and clamping assembly and the lower fork tube positioning and clamping assembly are both mounted on the cross-shaped support frame assembly. They can be assembled with the base through the T-shaped mounting seat of the cross-shaped support frame assembly. Therefore, not only is the number of parts reduced, but the upper fork tube positioning and clamping assembly and the lower fork tube positioning and clamping assembly both use the cross-shaped support frame assembly as the positioning reference, greatly reducing the accumulation of errors. To ensure that the bicycle frame meets the assembly size requirements after welding, this utility model... The pipe clamping assembly and the bottom bracket clamping assembly are assembled by a pin and fixed by a locking pin. In the lower fork pipe positioning clamping assembly, the height difference between the central axis of the lug clamping clamp and the lower fork pipe positioning unit is a fixed value, and the lower fork pipe positioning unit is placed horizontally. In order to ensure the center distance L between the central axis of the bottom bracket and the center of the rear axle mounting groove on the lug, the front and rear positions of the cross-shaped support frame assembly need to be adjusted. When the front and rear positions of the cross-shaped support frame assembly are adjusted by a large range, the angle between the lower fork pipe and the horizontal plane will change significantly. This will cause the wedge-shaped support block in the lower fork pipe positioning unit to fail to contact the two lower fork pipes, resulting in the two lower fork pipes not being able to be opened to the set position, making it difficult to meet the positioning requirements of the lower fork pipes. At this time, the reliability of the lower fork pipe positioning can be ensured by adjusting the angle of the vertical arm in the vertical pipe clamping assembly and coordinating with a small range of front and rear position adjustment of the cross-shaped support frame assembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the bicycle frame structure to which this utility model applies;

[0021] Figure 2 yes Figure 1 K-direction view;

[0022] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the base structure;

[0024] Figure 5 This is a schematic diagram of the positioning and clamping mechanism for the front triangular component;

[0025] Figure 6 yes Figure 5 A schematic diagram of the rear structure after spatial rotation around the vertical axis;

[0026] Figure 7 This is a schematic diagram of the positioning and clamping mechanism for the rear triangular component;

[0027] Figure 8 This is a schematic diagram of the upper fork tube positioning and clamping assembly, the cross-shaped support frame assembly, and their assembly structure in the positioning and clamping mechanism of the rear triangular component;

[0028] Figure 9 This is a schematic diagram of the lower fork tube positioning and clamping assembly, the cross-shaped support frame assembly, and their assembly structure in the rear triangular component positioning and clamping mechanism.

[0029] Figure 10 This is a schematic diagram of the lower fork tube positioning unit structure of the lower fork tube positioning and clamping assembly;

[0030] Figure 11 This is a schematic diagram of the working state of this utility model.

[0031] Explanation of each label in the diagram:

[0032] 1 is the front triangle component, 1-1 is the riser, and 1-2 is the bottom bracket.

[0033] 2 is the rear triangle component, 2-1 is the upper fork tube, 2-2 is the lower fork tube, 2-3 is the lug, 2-3-1 is the rear axle mounting groove, and 2-4 is the upper fork tube connecting to the short cross tube.

[0034] 3 is the base, 3-1 is the upright plate, 3-2 is the slide rail, and 3-3 is the mounting hole;

[0035] 4 is the positioning and clamping mechanism for the front triangular component.

[0036] 4-1 is the bottom bracket clamping assembly; 4-1-1 is the U-shaped mounting base; 4-1-2 is the bottom bracket clamping clamp; 4-1-3 is the bottom bracket locating pin seat; 4-1-4 is the arc-shaped long groove.

[0037] 4-2 is the riser clamping assembly, 4-2-1 is the riser arm, 4-2-2 is the riser clamping clamp mounting base, and 4-2-3 is the riser clamping clamp.

[0038] 4-3 is a locking pin.

[0039] 4-4 is a pin;

[0040] 5 is the positioning and clamping mechanism for the rear triangular component.

[0041] 5-1 is a cross-shaped support frame assembly, 5-1-1 is a T-shaped mounting base, 5-1-2 is a cross-shaped bracket, 5-1-3 is an upper fork tube bracket assembly base, and 5-1-4 is a lug locating pin seat.

[0042] 5-2 is the upper fork tube positioning and clamping assembly; 5-2-1 is the upper fork tube bracket; 5-2-2 is the horizontal tube; 5-2-3 is the upper fork tube clamping pliers; 5-2-4 is the long pressure head.

[0043] 5-3 is the lower fork tube positioning and clamping assembly, 5-3-1 is the ear plate clamping pliers, 5-3-2 is the lower fork tube positioning unit, 5-3-2-1 is the side push caliper, 5-3-2-2 is the support block push rod, 5-3-2-3 is the wedge-shaped support block, 5-3-3 is the lower fork tube bracket, 5-3-4 is the wedge-shaped support block sliding rail, and 5-3-5 is the lower fork tube limiting post. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] See Figure 1. Figure 2 A bicycle frame is described, comprising a front triangle component 1 and a rear triangle component 2. The assembly and welding process for this bicycle frame is as follows: First, the front triangle component 1 is welded. Then, the lower fork tube 2-2 of the rear triangle component 2 is welded to the connection points of the two sets of lugs 2-3. Next, the upper fork tube 2-1 and lower fork tube 2-2 of the front triangle component 1 and rear triangle component 2 are welded together. A short crossbeam 2-4 connecting the upper fork tubes 2-1 is welded between the two sets of upper fork tubes 2-1, and a short crossbeam 2-5 connecting the lower fork tubes 2-2 is welded between the two sets of lower fork tubes 2-2. Simultaneously, the connection points of the upper fork tube 2-1 and the two sets of lugs 2-3 are welded together, thus forming the bicycle frame assembly. According to the bicycle product assembly requirements, during the above-mentioned bicycle frame assembly and welding, the center distance L between the bottom bracket tube 1-2 of the front triangle component 1 and the rear axle mounting groove 2-3-1 on the lugs 2-3 of the rear triangle component 2 must be a set value.

[0046] See Figure 3 , Figure 4 To address the problems of complex structure, numerous parts, and error accumulation in existing welding fixtures, this utility model provides a bicycle frame welding fixture with a cross-shaped support frame. It includes a base 3, a front triangular component positioning and clamping mechanism 4, and a rear triangular component positioning and clamping mechanism 5. The base 3 is connected to the rotating shaft of a welding station indexing machine via a vertical plate 3-1 at one end. A through-type slide rail 3-2 is provided on the base 3 along its central axis, and several sets of assembly holes 3-3 are provided on the left and right sides of the slide rail. The front triangular component positioning and clamping mechanism 4 and the rear triangular component positioning and clamping mechanism 5 are mounted on the base 3. The front triangular component positioning and clamping mechanism 4 and the rear triangular component positioning and clamping mechanism 5 are provided with grooves that mate with the slide rail 3-2 on the base 3 and elongated holes that mate with the assembly holes 3-3, thereby enabling adjustment of the front and rear positions of the front triangular component positioning and clamping mechanism 4 and the rear triangular component positioning and clamping mechanism 5.

[0047] See Figure 3 , Figure 5 , Figure 6The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes a front triangle component positioning and clamping mechanism 4 comprising a bottom bracket clamping assembly 4-1 and a riser clamping assembly 4-2. The bottom bracket clamping assembly 4-1 includes a U-shaped mounting base 4-1-1, a bottom bracket positioning pin seat 4-1-3, and a bottom bracket clamping clamp 4-1-2. The bottom surface of the U-shaped mounting base 4-1-1 is provided with a sliding groove that mates with the slide rail 3-2 on the base 3 and an elongated hole that mates with the assembly hole 3-3. The bottom bracket clamping assembly 4-1 is assembled with the base 3 via the U-shaped mounting base 4-1-1. A bottom-joint pipe positioning pin seat 4-1-3 is mounted on the side wall, and an arc-shaped long groove 4-1-4 is opened on the inner side wall of the U-shaped mounting seat 4-1-1. The arc-shaped long groove 4-1-4 is located above the bottom-joint pipe positioning pin seat 4-1-3. The bottom-joint pipe clamping pliers 4-1-2 are mounted on the outer side wall of the U-shaped mounting seat 4-1-1. They are side-push type clamping pliers. Their clamping heads are arranged opposite to the bottom-joint pipe positioning pin seat 4-1-3. The clamping heads of the side-push type clamping pliers can cooperate with the bottom-joint pipe positioning pin seat 4-1-3 to clamp the two ends of the bottom-joint pipe 1-2 of the front triangular component 1, thereby achieving the positioning of the center plane of the front triangular component 1.

[0048] See also Figure 3 , Figure 5 , Figure 6 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes a front triangle component positioning and clamping mechanism 4 with a riser clamping assembly 4-2 comprising a riser arm 4-2-1, a riser clamping clamp mounting base 4-2-2, and a riser clamping clamp 4-2-3. The riser arm 4-2-1 is hinged to the inner wall of the U-shaped mounting base 4-1-1 of the five-way pipe clamping assembly 4-1 via a pin 4-4, and is fixed to the inner wall of the U-shaped mounting base 4-1-1 by a locking pin 4-3 passing through the arc-shaped long groove 4-1-4 on the inner wall of the U-shaped mounting base 4-1-1. The riser clamping clamp mounting base 4-2-2 is fitted with the riser arm 4-2-1, and the riser clamping clamp 4-2-3 is mounted on the riser clamping clamp mounting base 4-2-2. The riser clamping clamp 4-2-3 is a downward clamping clamp, which clamps and fixes the upper end of the riser 1-1 through its clamping head.

[0049] See Figure 3 , Figure 7 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes a rear triangular component positioning and clamping machine 5 comprising an upper fork tube positioning and clamping assembly 5-2, a lower fork tube positioning and clamping assembly 5-3, and a cross-shaped support frame assembly 5-1. The upper fork tube positioning and clamping assembly 5-2 is installed on the upper part of the cross-shaped support frame assembly 5-1, and the lower fork tube positioning and clamping assembly 5-3 is installed on the lower part of the cross-shaped support frame assembly 5-1. The cross-shaped support frame assembly 5-1 is fitted with a base 3.

[0050] See Figure 7 , Figure 8 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes a cross-shaped support frame assembly 5-1 comprising a cross 5-1-2, a T-shaped mounting base 5-1-1, an upper fork tube bracket assembly base 5-1-3, and an earpiece positioning pin seat 5-1-4. The bottom surface of the T-shaped mounting base 5-1-1 is provided with a sliding groove that mates with the slide rail 3-2 on the base 3 and an elongated hole that mates with the assembly hole 3-3. The cross 5-1-2 is assembled onto the base 3 via the T-shaped mounting base 5-1-1. The upper fork tube bracket assembly base 5-1-3 and the earpiece positioning pin seat 5-1-4 are both installed on the vertical beam of the cross 5-1-2, located above the cross beam, with the earpiece positioning pin seats 5-1-4 symmetrically arranged on both sides of the vertical beam of the cross.

[0051] See also Figure 7 , Figure 8 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes an upper fork tube positioning and clamping assembly 5-2 of the rear triangular component positioning and clamping mechanism 5, which includes an upper fork tube bracket 5-2-1 and an upper fork tube clamping clamp 5-2-3. The upper fork tube bracket 5-2-1 is hinged to the upper fork tube bracket mounting seat 5-1-3 of the cross-shaped support frame assembly 5-1 and fixed by a bolt assembly. A horizontal tube 5-2-2 for supporting the upper fork tube is provided at the front end of the upper fork tube bracket 5-2-1. The upper fork tube clamping clamp 5-2-3 is installed on the upper fork tube bracket 5-2-1 and the upper fork tube 2-1 is clamped and fixed by a transversely arranged long pressure head 5-2-4.

[0052] See Figure 7 , Figure 9 , Figure 10 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model includes a rear triangular component positioning and clamping mechanism 5 comprising a lower fork tube bracket 5-3-3, lower fork tube limiting posts 5-3-5, and a lower fork tube positioning unit 5-3-2. One end of the lower fork tube bracket 5-3-3 is fixed to the vertical beam of the cross 5-1-2, located below the cross beam. Two sets of lower fork tube limiting posts 5-3-5 are symmetrically arranged on the left and right sides of the other end of the lower fork tube bracket 5-3-3. The lower fork tube bracket 5-3-3 is provided with positioning positions for the lower fork tube limiting posts 5-3-5. The adjustable long slot, the lower fork tube limiting post 5-3-5 is assembled with the lower fork tube bracket 5-3-3 by bolts passing through the long slot; the lower fork tube positioning unit 5-3-2 includes a wedge-shaped support block 5-3-2-3, a support block push rod 5-3-2-2 and a side-push caliper 5-3-2-1, the wedge-shaped support block 5-3-2-3 is fixed to one end of the support block push rod 5-3-2-2, the side-push caliper 5-3-2-1 is installed on the back of the cross beam, and its driven arm passes through the cross beam and is connected to the other end of the support block push rod 5-3-2-2 by a threaded connection.

[0053] See Figure 9 , Figure 10 The bicycle frame welding fixture with a cross-shaped support frame described in this utility model is further provided with a wedge-shaped support block sliding track 5-3-4 in its lower fork tube positioning and clamping assembly 5-3. The wedge-shaped support block sliding track 5-3-4 is fixed on the lower fork tube bracket 5-3-3. The bottom surface of the wedge-shaped support block 5-3-2-3 is provided with a sliding groove that cooperates with the wedge-shaped support block sliding track 5-2-4.

[0054] See Figures 1 to 11 When using this utility model to assemble and weld the front and rear triangle components of a bicycle frame, first adjust the relative assembly positions of the front triangle component positioning and clamping mechanism 4, the rear triangle component positioning and clamping mechanism 5, and the base 3 according to the size and specifications of the workpiece to be welded. Then adjust the positional relationship between the riser clamping assembly 4-2 and the bottom bracket clamping assembly 4-1 in the front triangle component positioning and clamping mechanism 4 (including the height of the riser clamping clamp mounting base and the angle between the riser arm 4-2-1 and the U-shaped mounting base). Finally, adjust the upper fork tube bracket 5 in the rear triangle component positioning and clamping mechanism 5. -2-1 angle; place the front triangle component 1 in the position of the front triangle component positioning clamping mechanism 4, and clamp both ends of the bottom tube 1-2 of the front triangle component 1 through the bottom tube clamping assembly 4-1, and then clamp the upper end of the top tube 1-2 of the front triangle component 1 through the riser clamping assembly 4-2. At this time, the front triangle component 1 is fixed; then place the lower fork tube 2-2 of the rear triangle component 2 on the lower fork tube positioning clamping assembly 5-3 of the rear triangle component positioning clamping mechanism 5, and close the side push type caliper 5-3- in the lower fork tube positioning unit 5-3-2. 2-1. Push the wedge-shaped support block 5-3-2-3 outward to move the two lower fork tubes 2-2. When the outer walls of the two lower fork tubes 2-2 abut against the two sets of lower fork tube limiting posts 5-3-5 arranged on the left and right, the ear pieces 2-3 welded to the lower fork tubes 2-2 are positioned and fixed by the ear piece positioning pin seat 5-1-4 and the ear piece clamping pliers 5-3-1, thus completing the placement and positioning of the lower fork tubes 2-2. Insert the rear end of the upper fork tube 2-1 into the corresponding part of the protrusion of the ear piece 2-3, and the front end is mounted on the horizontal tube 5-2 of the upper fork tube bracket 5-2-1. -2. Close the upper fork tube clamping clamp 5-2-3 to clamp and fix the upper fork tube 2-1. Measure whether the center distance L between the five-way tube 1-2 of the front triangular component 1 and the rear axle mounting groove 2-3-1 on the lug 2-3 of the rear triangular component 2 meets the set value requirement. If L meets the set value requirement, the welding operation begins. If L does not meet the set value requirement, adjust the workpiece placement posture and / or the relative positions of the front triangular component positioning clamping mechanism 4 and the rear triangular component positioning clamping mechanism 5 until L meets the set value requirement, and then perform the welding operation. In the welding operation of this utility model, after the welding operation on one side of the workpiece is completed, the utility model and the workpiece are rotated 180 degrees by the welding station indexing machine to start the welding process on the other side of the workpiece, meeting the full welding process requirements of the welding part.

Claims

1. A bicycle frame assembly welding tool for setting a cross-type support frame, characterized by: It includes a base (3), a front triangular component positioning and clamping mechanism (4), and a rear triangular component positioning and clamping mechanism (5). One end of the base (3) is connected to the rotating shaft of the welding station indexing machine, and the front triangular component positioning and clamping mechanism (4) and the rear triangular component positioning and clamping mechanism (5) are assembled on the base (3). The front triangular component positioning and clamping mechanism (4) includes a five-way pipe clamping assembly (4-1) and a riser pipe clamping assembly (4-2). The five-way pipe clamping assembly (4-1) is fitted with the base (3). The riser pipe clamping assembly (4-2) is assembled with the five-way pipe clamping assembly (4-1) through a pin (4-4) and fixed by a locking pin (4-3). The rear triangular component positioning and clamping machine (5) includes an upper fork tube positioning and clamping assembly (5-2), a lower fork tube positioning and clamping assembly (5-3), and a cross-shaped support frame assembly (5-1). The upper fork tube positioning and clamping assembly (5-2) and the lower fork tube positioning and clamping assembly (5-3) are both mounted on the cross-shaped support frame assembly (5-1), and the cross-shaped support frame assembly (5-1) is fitted with the base (3).

2. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 1, wherein: The cross-shaped support frame assembly (5-1) of the rear triangular component positioning and clamping mechanism (5) includes a cross (5-1-2), a T-shaped mounting seat (5-1-1), an upper fork tube bracket assembly seat (5-1-3), and an ear plate positioning pin seat (5-1-4); the cross (5-1-2) is assembled on the base (3) through the T-shaped mounting seat (5-1-1); the upper fork tube bracket assembly seat (5-1-3) and the ear plate positioning pin seat (5-1-4) are both installed on the vertical beam of the cross (5-1-2), located above the cross beam, wherein the ear plate positioning pin seat (5-1-4) is symmetrically arranged on both sides of the vertical beam of the cross.

3. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 2, wherein: The upper fork tube positioning and clamping assembly (5-2) of the rear triangular component positioning and clamping mechanism (5) includes an upper fork tube bracket (5-2-1) and an upper fork tube clamping clamp (5-2-3). The upper fork tube bracket (5-2-1) is hinged to the upper fork tube bracket mounting seat (5-1-3) of the cross-shaped support frame assembly (5-1) and fixed by bolt assembly. A horizontal tube (5-2-2) for supporting the upper fork tube is provided at the front end of the upper fork tube bracket (5-2-1). The upper fork tube clamping clamp (5-2-3) is installed on the upper fork tube bracket (5-2-1) and the upper fork tube (2-1) is clamped and fixed by a transversely arranged long pressure head (5-2-4).

4. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 2 or 3, wherein: The lower fork tube positioning and clamping assembly (5-3) of the rear triangular component positioning and clamping mechanism (5) includes a lower fork tube bracket (5-3-3), a lower fork tube limiting post (5-3-5), and a lower fork tube positioning unit (5-3-2); one end of the lower fork tube bracket (5-3-3) is fixed on the vertical beam of the cross (5-1-2) and located below the cross beam; two sets of lower fork tube limiting posts (5-3-5) are symmetrically arranged on the left and right sides of the other end of the lower fork tube bracket (5-3-3). The lower fork tube positioning unit (5-3-2) includes a wedge-shaped support block (5-3-2-3), a support block push rod (5-3-2-2), and a side-push caliper (5-3-2-1). The wedge-shaped support block (5-3-2-3) is fixed to one end of the support block push rod (5-3-2-2). The side-push caliper (5-3-2-1) is installed on the back of the cross beam, and its driven arm passes through the cross beam and is connected to the other end of the support block push rod (5-3-2-2) by a threaded connection.

5. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 4, wherein: A long groove is provided on the lower fork tube bracket (5-3-3) for adjusting the left and right positions of the lower fork tube limiting post (5-3-5). The lower fork tube limiting post (5-3-5) is assembled with the lower fork tube bracket (5-3-3) by bolts passing through the long groove.

6. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 5, wherein: The lower fork tube positioning and clamping assembly (5-3) also includes a wedge-shaped support block sliding track (5-3-4), which is fixed on the lower fork tube bracket (5-3-3). The bottom surface of the wedge-shaped support block (5-3-2-3) is provided with a groove that cooperates with the wedge-shaped support block sliding track (5-2-4).

7. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 6, wherein: The lower fork tube positioning and clamping assembly (5-3) also includes ear clamping pliers (5-3-1). The ear clamping pliers (5-3-1) are side-push type clamping pliers, which are arranged at both ends of the cross beam. The clamping head cooperates with the ear positioning pin seat (5-1-4) installed on the cross beam (5-1-2) to clamp and fix the left and right sets of ear pieces (2-3).

8. The bicycle frame welding fixture with a cross-shaped support frame as described in claim 4, characterized in that: The bottom pipe clamping assembly (4-1) of the front triangular component positioning and clamping mechanism (4) includes a U-shaped mounting base (4-1-1), a bottom pipe positioning pin seat (4-1-3), and a bottom pipe clamping clamp (4-1-2). The bottom surface of the U-shaped mounting base (4-1-1) is assembled with the base (3). The bottom pipe positioning pin seat (4-1-3) is assembled on the inner side wall of the U-shaped mounting base (4-1-1). An arc-shaped long groove (4-1-4) is opened on the inner side wall of the U-shaped mounting base (4-1-1). The arc-shaped long groove (4-1-4) is located above the bottom pipe positioning pin seat (4-1-3). The bottom pipe clamping clamp (4-1-2) is installed on the outer side wall of the U-shaped mounting base (4-1-1). It is a side-push clamping clamp, and its clamping head is arranged opposite to the bottom pipe positioning pin seat (4-1-3).

9. The bicycle frame assembly welding apparatus for assembling a cross support frame according to claim 8, wherein: The riser clamping assembly (4-2) of the front triangular component positioning and clamping mechanism (4) includes a riser arm (4-2-1), a riser clamping clamp mounting base (4-2-2), and a riser clamping clamp (4-2-3). The riser arm (4-2-1) is hinged to the inner wall of the U-shaped mounting base (4-1-1) of the five-way pipe clamping assembly (4-1), and is fixed to the inner wall of the U-shaped mounting base (4-1-1) by a locking pin (4-3) passing through the arc-shaped long groove (4-1-4). The riser clamping clamp mounting base (4-2-2) is fitted with the riser arm (4-2-1), and the riser clamping clamp (4-2-3) is mounted on the riser clamping clamp mounting base (4-2-2). The riser clamping clamp (4-2-3) is a downward clamping clamp, which clamps and fixes the upper end of the riser (1-1) through its pressure head.

10. The bicycle frame assembly welding tool for assembling a cross support frame according to claim 8, wherein: The upper surface of the base (3) is provided with a slide rail (3-2) with a through structure along the central axis, and several sets of assembly holes (3-3) are provided on the left and right sides of the slide rail; the bottom surface of the U-shaped mounting seat (4-1-1) in the front triangular component positioning and clamping mechanism (4) and the bottom surface of the T-shaped mounting seat (5-1-1) in the rear triangular component positioning and clamping mechanism (5) are provided with a sliding groove that cooperates with the slide rail (3-2) on the base (3) and an elongated hole that cooperates with the assembly hole (3-3).

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