Pneumatic positioning and clamping tool for welding front triangular component of bicycle frame

Abstract

A bicycle frame front triangular component welding pneumatic positioning and clamping tool comprises a base, a head pipe positioning and clamping mechanism, an upper and lower pipe positioning and clamping mechanism, a vertical pipe positioning and clamping mechanism and a five-way pipe positioning and clamping mechanism. The base is provided with a workbench of a rectangular frame structure. The head tube positioning and clamping mechanism is mounted on the short edge of the rectangular frame and is provided with a head tube pneumatic positioning and clamping assembly; the upper and lower pipe positioning and clamping mechanism and the vertical pipe positioning and clamping mechanism are detachably assembled with the rectangular frame, an upper and lower pipe pneumatic positioning and clamping assembly is arranged in the upper and lower pipe positioning and clamping mechanism, and a vertical pipe upper end pneumatic pressing assembly and a vertical pipe positioning assembly are arranged in the vertical pipe positioning and clamping mechanism. The five-way pipe positioning and clamping mechanism is installed on the lower portion of the vertical pipe positioning and clamping mechanism and provided with a five-way pipe pneumatic positioning and clamping assembly. The bicycle frame front triangle welding device can be matched with different types of bicycle frame front triangle welding processes, and the purposes of improving workpiece welding quality and working efficiency and reducing production cost are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle production equipment technical field, concretely is a kind of pneumatic positioning clamping tool for welding of bicycle frame front triangular component. BACKGROUND

[0002] As shown in the accompanying drawings, Figure 1 Bicycle frame front triangular component 1 is composed of head tube 1-1, upper tube 1-2, lower tube 1-5, vertical tube 1-3 and five-way tube 1-4, and the above-mentioned components are generally combined into one by welding process using ordinary carbon steel pipe. Since bicycle is driven by human driving force and riding skills, frame becomes an important structure for carrying human body and bearing impact load in the process of bicycle running, and the advantages and disadvantages of manufacturing precision will directly affect the safety and stability of riding, so in the production process of bicycle, bicycle frame welding operation becomes one of the key control processes. In addition, due to the diversity of bicycle types and specifications, different types of bicycle frames have different shapes and sizes, in order to meet the requirements of universality, improve work efficiency and reduce production cost, the positioning and clamping tool of workpiece in the process of bicycle frame welding needs to be improved and designed. SUMMARY

[0003] The utility model provides a kind of bicycle frame front triangular component welding pneumatic positioning clamping tool, it aims to match different types of bicycle frame front triangular welding process by the cooperation of base, head tube positioning and clamping mechanism, upper and lower tube positioning and clamping mechanism, vertical tube positioning and clamping mechanism and five-way tube positioning and clamping mechanism, to improve workpiece welding quality and work efficiency, reduce the purpose of production cost.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A kind of bicycle frame front triangular component welding pneumatic positioning clamping tool, including base, head tube positioning and clamping mechanism, upper and lower tube positioning and clamping mechanism, vertical tube positioning and clamping mechanism and five-way tube positioning and clamping mechanism;The base is equipped with the workbench of rectangular frame structure, is fixed on horizontal ground, is equipped with several groups of assembly holes on the two long sides of rectangular frame;Head tube positioning and clamping mechanism is installed on the short side of rectangular frame, is equipped with the head tube pneumatic positioning and clamping assembly that can be adjusted in position up and down;Upper and lower tube positioning and clamping mechanism, vertical tube positioning and clamping mechanism are respectively assembled with the assembly hole on rectangular frame in detachable mode, is equipped with the upper and lower tube pneumatic positioning and clamping assembly that can be realized angle and upper and lower position adjustment in upper and lower tube positioning and clamping mechanism, is equipped with vertical tube upper end pneumatic pressing assembly and vertical tube positioning assembly in vertical tube positioning and clamping mechanism;Five-way tube positioning and clamping mechanism is installed in the lower part of vertical tube positioning and clamping mechanism, is equipped with five-way tube pneumatic positioning and clamping assembly.

[0006] The upper and lower tube positioning and clamping mechanism is further provided with an L-shaped support, horizontal arms of the L-shaped support are assembled with the base rectangular frame through support plates at both ends of the horizontal arms, horizontal sliding grooves are arranged on the support plates, and vertical sliding grooves are arranged on vertical arms of the L-shaped support.

[0007] The upper and lower tube positioning unit comprises a positioning block and a positioning seat, the positioning seat is a T-shaped seat structure, a stud is arranged at the tail of the positioning seat, the stud passes through the vertical sliding groove of the L-shaped support and is fixed through a fixing block and a locking nut, and the positioning block is mounted at both ends of the head of the positioning seat, and an arc-shaped positioning groove matched with the outer surface of the upper and lower tube workpiece is arranged on the positioning block.

[0008] The upper and lower tube positioning unit comprises a positioning block and a positioning seat, the positioning seat is a T-shaped seat structure, a stud is arranged at the tail of the positioning seat, the stud passes through the vertical sliding groove of the L-shaped support and is fixed through a fixing block and a locking nut, and the positioning block is mounted at both ends of the head of the positioning seat, and an arc-shaped positioning groove matched with the outer surface of the upper and lower tube workpiece is arranged on the positioning block.

[0009] The head tube positioning and clamping mechanism comprises a head tube positioning block, an adjustable connecting seat and a head tube clamping pneumatic cylinder, two groups of the head tube positioning block are arranged in an up-down mode, a V-shaped positioning groove is arranged on each group of the head tube positioning block, and a supporting plate for limiting the height position of the head tube is arranged at the bottom of the lower group of the head tube positioning block, and the telescopic arm of the head tube clamping pneumatic cylinder is connected with the head tube positioning block through the adjustable connecting seat.

[0010] The upper and lower tube positioning unit comprises a positioning block and a positioning seat, the positioning seat is a T-shaped seat structure, a stud is arranged at the tail of the positioning seat, the stud passes through the vertical sliding groove of the L-shaped support and is fixed through a fixing block and a locking nut, and the positioning block is mounted at both ends of the head of the positioning seat, and an arc-shaped positioning groove matched with the outer surface of the upper and lower tube workpiece is arranged on the positioning block.

[0011] The upper and lower tube positioning unit comprises a positioning block and a positioning seat, the positioning seat is a T-shaped seat structure, a stud is arranged at the tail of the positioning seat, the stud passes through the vertical sliding groove of the L-shaped support and is fixed through a fixing block and a locking nut, and the positioning block is mounted at both ends of the head of the positioning seat, and an arc-shaped positioning groove matched with the outer surface of the upper and lower tube workpiece is arranged on the positioning block.

[0012] The five-way pipe positioning and clamping mechanism includes a five-way pipe pressing cylinder and a five-way pipe pressing head.

[0013] The bicycle frame front triangular part welding pneumatic positioning and clamping tool further has a group of cylinder action control handles arranged on the front vertical surface of the rectangular frame of the base.

[0014] The bicycle frame front triangular part welding pneumatic positioning and clamping tool has a head pipe positioning and clamping mechanism, an upper and lower pipe positioning and clamping mechanism, a vertical pipe positioning and clamping mechanism and a five-way pipe positioning and clamping mechanism, all of which are driven by cylinders, and the cylinder action control handles are arranged on the front vertical surface of the rectangular frame of the base. The pneumatic control not only ensures the consistency of the workpiece clamping force, but also improves the convenience of operation. The workbench of the base is designed as a rectangular frame structure, and the L-shaped support horizontal arm of the upper and lower pipe positioning and clamping mechanism and the U-shaped support bottom edge of the vertical pipe positioning and clamping mechanism are fixedly assembled in a detachable manner through the assembly holes in the two long sides of the rectangular frame. This not only greatly improves the stability and reliability of the upper and lower pipe positioning and clamping mechanism, the vertical pipe positioning and clamping mechanism and the five-way pipe positioning and clamping mechanism, but also is beneficial to ensuring the welding quality and assembly precision of the workpiece and improving the universal performance of the utility model. In summary, the utility model cooperates the base, the head pipe positioning and clamping mechanism, the upper and lower pipe positioning and clamping mechanism, the vertical pipe positioning and clamping mechanism and the five-way pipe positioning and clamping mechanism, can match different types of bicycle frame front triangular welding processes, and achieves the purposes of improving the workpiece welding quality and work efficiency and reducing production cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a bicycle frame front triangular part structure schematic view;

[0016] Figure 2 is a whole structure schematic view of the utility model;

[0017] Figure 3 is an upper and lower pipe positioning and clamping mechanism schematic view;

[0018] Figure 4 is Figure 3 horizontal rotation after a certain angle structure schematic view;

[0019] Figure 5 is an upper and lower pipe positioning unit structure schematic view;

[0020] Figure 6 is the schematic diagram of the upper and lower tube pressing unit structure;

[0021] Figure 7 is the schematic diagram of the working state of the utility model;

[0022] Figure 8 is the K direction view of Figure 7 .

[0023] The explanation of each mark in the figure is as follows:

[0024] 1 is the front triangular part of the bicycle frame, 1-1 is the head tube, 1-2 is the upper tube, 1-3 is the vertical tube, 1-4 is the five-way tube, and 1-5 is the lower tube;

[0025] 2 is the base, 2-1 is the rectangular frame, and 2-2 is the assembly hole;

[0026] 3 is the head tube positioning and clamping mechanism, 3-1 is the head tube clamping cylinder, 3-2 is the head tube positioning block, and 3-3 is the adjustable connecting seat;

[0027] 4 is the upper and lower tube positioning and clamping mechanism, 4-1 is the L-shaped support, 4-1-1 is the vertical sliding groove, 4-2 is the support plate, 4-2-1 is the horizontal sliding groove, 4-3 is the pressing seat, 4-4 is the rotating cylinder, 4-5 is the upper and lower tube pressing head, 4-6 is the positioning block, 4-7 is the positioning seat, 4-8 is the fixed block, 4-9 is the stud, and 4-10 is the locking nut;

[0028] 5 is the vertical tube positioning and clamping mechanism, 5-1 is the vertical tube pressing cylinder, 5-2 is the vertical tube pressing head, 5-3 is the vertical tube positioning assembly, and 5-4 is the U-shaped support;

[0029] 6 is the five-way tube positioning and clamping mechanism, 6-1 is the five-way tube pressing cylinder, and 6-2 is the five-way tube pressing head;

[0030] 7 is the cylinder action control handle. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with the drawings and specific embodiments.

[0032] Referring to FIG. 1, a common bicycle frame front triangular part 1 is composed of a head tube 1-1, an upper tube 1-2, a lower tube 1-5, a vertical tube 1-3 and a five-way tube 1-4, and each component part is combined into one body by welding process. Due to the diversity of types and specifications of bicycles, the shapes and sizes of different types of bicycle frames are different, and the welding positions of each component part in the bicycle frame front triangular part 1 are also different. The following describes the structural features of the utility model by taking the bicycle frame front triangular part 1 shown in FIG. 1 as a specific embodiment. Figure 1

[0033] Referring to​Figure 2 、 Figure 7 、 Figure 8 The utility model provides a bicycle frame front triangular part welding pneumatic positioning clamping frock, it includes base 2, head tube positioning clamping mechanism 3, upper and lower tube positioning clamping mechanism 4, vertical tube positioning clamping mechanism 5 and five -way tube positioning clamping mechanism 6, the base 2 is equipped with the workbench of rectangular frame structure, is fixed on the horizontal ground, is equipped with a plurality of assembly holes 2-2 on two long sides of rectangular frame 2-1, head tube positioning clamping mechanism 3 is installed on one side short edge of rectangular frame 2-1, is equipped with the head tube pneumatic positioning clamping subassembly of up and down position adjustment, upper and lower tube positioning clamping mechanism 4, vertical tube positioning clamping mechanism 5 respectively with the assembly hole 2-2 on rectangular frame 2-1 with detachable mode assembly, can realize the adjustment of length direction through the cooperation of different assembly holes 2-2 on rectangular frame 2-1, to match the structure size of workpiece length direction, be equipped with the upper and lower tube pneumatic positioning clamping subassembly of realizing angle and up and down position adjustment in upper and lower tube positioning clamping mechanism 4, to realize the cooperation with different types of bicycle frame, vertical tube positioning clamping mechanism 5 is equipped with vertical tube upper end pneumatic pressure subassembly and vertical tube positioning subassembly, five -way tube positioning clamping mechanism 6 is installed in the lower part of vertical tube positioning clamping mechanism, is equipped with five -way tube pneumatic positioning clamping subassembly, before carrying out bicycle frame front triangular part 1 welding operation, can pass through head tube positioning clamping mechanism 3, upper and lower tube positioning clamping mechanism 4, vertical tube positioning clamping mechanism 5 and five -way tube positioning clamping mechanism 6 cooperation, with the positioning lock of each component of bicycle frame front triangular part 1.

[0034] Referring to Figure 2 The head tube pneumatic positioning clamping subassembly in the head tube positioning clamping mechanism 3 of the bicycle frame front triangular part welding pneumatic positioning clamping frock includes head tube positioning block 3-2, adjustable connecting seat 3-3 and head tube clamping cylinder 3-1; the head tube positioning block 3-2 is arranged in two groups up and down, V-shaped positioning groove is set up on each head tube positioning block 3-2, and a supporting plate for limiting the height position of the head tube is set up on the bottom of the lower head tube positioning block; the telescopic arm of the head tube clamping cylinder 3-1 is connected with the head tube positioning block 3-2 through adjustable connecting seat 3-3.

[0035] Referring to Figure 3 、 Figure 4The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and the upper and lower pipe positioning clamping mechanism 4 is equipped with L type support 4-1 still, the both ends of horizontal arm of L type support 4-1 are assembled with the rectangular frame 2-1 of base 2 through support plate 4-2, be equipped with horizontal sliding slot 4-2-1 on support plate 4-2, through horizontal sliding slot 4-2-1 can realize the stepless adjustment of L type support 4-1 in left and right directions, to more widely adapt to the length direction size change of bicycle frame part 1, the utility model is equipped with vertical sliding slot 4-1-1 on the vertical arm of L type support 4-1 still, the upper and lower pipe pneumatic positioning clamping subassembly includes two parts of upper and lower arrangement, is equipped with upper and lower pipe positioning unit and upper and lower pipe pressure unit in each part, and the upper pipe 1-2 of bicycle frame front triangular part 1, lower pipe 1-5 are fixed through upper and lower pipe positioning unit and upper and lower pipe pressure unit, and upper and lower pipe positioning unit and upper and lower pipe pressure unit are assembled with the vertical sliding slot 4-1-1 of L type support 4-1, can realize the matching with the height size of bicycle frame part 1.

[0036] Referring to Figure 3 、 Figure 4 、 Figure 5 The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and the upper and lower pipe positioning clamping mechanism 4 is equipped with L type support 4-1 still, the both ends of horizontal arm of L type support 4-1 are assembled with the rectangular frame 2-1 of base 2 through support plate 4-2, be equipped with horizontal sliding slot 4-2-1 on support plate 4-2, through horizontal sliding slot 4-2-1 can realize the stepless adjustment of L type support 4-1 in left and right directions, to more widely adapt to the length direction size change of bicycle frame part 1, the utility model is equipped with vertical sliding slot 4-1-1 on the vertical arm of L type support 4-1 still, the upper and lower pipe pneumatic positioning clamping subassembly includes two parts of upper and lower arrangement, is equipped with upper and lower pipe positioning unit and upper and lower pipe pressure unit in each part, and the upper pipe 1-2 of bicycle frame front triangular part 1, lower pipe 1-5 are fixed through upper and lower pipe positioning unit and upper and lower pipe pressure unit, and upper and lower pipe positioning unit and upper and lower pipe pressure unit are assembled with the vertical sliding slot 4-1-1 of L type support 4-1, can realize the matching with the height size of bicycle frame part 1.

[0037] Referring to Figure 3 、 Figure 4 、 Figure 6 The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and the upper and lower pipe positioning clamping mechanism 4 is equipped with L type support 4-1 still, the both ends of horizontal arm of L type support 4-1 are assembled with the rectangular frame 2-1 of base 2 through support plate 4-2, be equipped with horizontal sliding slot 4-2-1 on support plate 4-2, through horizontal sliding slot 4-2-1 can realize the stepless adjustment of L type support 4-1 in left and right directions, to more widely adapt to the length direction size change of bicycle frame part 1, the utility model is equipped with vertical sliding slot 4-1-1 on the vertical arm of L type support 4-1 still, the upper and lower pipe pneumatic positioning clamping subassembly includes two parts of upper and lower arrangement, is equipped with upper and lower pipe positioning unit and upper and lower pipe pressure unit in each part, and the upper pipe 1-2 of bicycle frame front triangular part 1, lower pipe 1-5 are fixed through upper and lower pipe positioning unit and upper and lower pipe pressure unit, and upper and lower pipe positioning unit and upper and lower pipe pressure unit are assembled with the vertical sliding slot 4-1-1 of L type support 4-1, can realize the matching with the height size of bicycle frame part 1.

[0038] Referring to Figure 2 、 Figure 7 、 Figure 8The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and its vertical pipe positioning clamping mechanism 5 is equipped with U type support 5-4, two vertical arms of U type support 5-4 are different in height, and the state of being low in front and high in back is presented, and vertical pipe upper end pneumatic pressure assembly and vertical pipe positioning assembly are installed on the vertical arm behind U type support 5-4, vertical pipe upper end pneumatic pressure assembly includes vertical pipe pressure cylinder 5-1 and vertical pipe pressure head 5-2, and vertical pipe pressure cylinder 5-1 is vertically arranged, and the telescopic arm goes up and down, and vertical pipe pressure head 5-2 is installed on the telescopic arm of vertical pipe pressure cylinder 5-1, when the telescopic arm of vertical pipe pressure cylinder 5-1 stretches out, vertical pipe pressure head 5-2 will press the upper end of vertical pipe 1-3, vertical pipe positioning assembly 5-3 includes two parts arranged up and down, and the arc-shaped positioning groove matched with the outer surface of vertical pipe 1-3 in bicycle frame front triangular part 1 is arranged in each part, and the front, rear and outer position of vertical pipe 1-3 can be defined through the arc-shaped positioning groove.

[0039] Still referring to Figure 2 、 Figure 7 、 Figure 8 The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and its five -way tube positioning clamping mechanism 6 five -way tube pneumatic positioning clamping assembly includes five -way tube pressure cylinder 6-1 and five -way tube pressure head 6-2, five -way tube pressure cylinder 6-1 is installed on the front vertical arm of U type support 5-4 of vertical pipe positioning clamping mechanism 5, and five -way tube pressure head 6-2 is arranged to two groups opposite, wherein one group is fixedly installed on the rear vertical arm lower part of U type support 5-4 of vertical pipe positioning clamping mechanism 5, and the other group is installed on the telescopic arm of five -way tube pressure cylinder 6-1, when the telescopic arm of five -way tube pressure cylinder 6-1 stretches out, through two groups of five -way tube pressure head 6-2 opposite arrangement, five -way tube 1-4 both ends are pressed tightly fixed.

[0040] Still referring to Figure 2 、 Figure 7 、 Figure 8 The utility model discloses a bicycle frame front triangular part welding pneumatic positioning clamping tool, and it is equipped with a group of cylinder action control handle 7, and cylinder action control handle 7 is arranged on the front vertical surface of the rectangular frame 2-1 of base 2.

[0041] Referring to Figures 1 to 8When the front triangular part of the bicycle frame is welded by the utility model, first, the position and space posture of the head tube positioning and clamping mechanism 3, the upper and lower tube positioning and clamping mechanism 4, the vertical tube positioning and clamping mechanism 5 and the five-way tube positioning and clamping mechanism 6 are adjusted according to the structure size of the batch of front triangular parts of the bicycle frame 1; then the head tube 1-1, the upper tube 1-2, the lower tube 1-5, the vertical tube 1-3 and the five-way tube 1-4 are positioned through the corresponding positioning structures respectively; the size of the combined components is checked to match the size of the workpiece after welding; the cylinders in the head tube positioning and clamping mechanism 3, the upper and lower tube positioning and clamping mechanism 4, the vertical tube positioning and clamping mechanism 5 and the five-way tube positioning and clamping mechanism 6 are actuated through the operation cylinder action control handle 7 to clamp and fix the components; after the above operation is completed, the workpiece is welded by using welding equipment and tools.

Claims

1. A welding pneumatic positioning and clamping tool for a front triangle component of a bicycle frame, characterized in that: The utility model relates to a head tube positioning and clamping mechanism, upper and lower tube positioning and clamping mechanism, vertical tube positioning and clamping mechanism and five-way tube positioning and clamping mechanism, which are installed on the base (2) with rectangular frame structure.

2. The welding fixture for positioning and clamping the front triangle component of a bicycle frame as claimed in claim 1, wherein: The upper and lower tube positioning and clamping mechanism (4) is further provided with an L-shaped support (4-1), the horizontal arms of the L-shaped support (4-1) are assembled with the rectangular frame (2-1) of the base (2) through support plates (4-2), horizontal sliding grooves (4-2-1) are arranged on the support plates (4-2), and vertical sliding grooves (4-1-1) are arranged on the vertical arms of the L-shaped support (4-1); the upper and lower tube pneumatic positioning and clamping assembly comprises two parts arranged in an upper and lower mode, and a upper and lower tube positioning unit and a upper and lower tube pressing unit are arranged in each part; the upper and lower tube positioning unit and the upper and lower tube pressing unit are matched with the vertical sliding grooves (4-1-1) of the L-shaped support (4-1).

3. The gas-actuated positioning and clamping fixture for welding the front triangle component of a bicycle frame according to claim 2, characterized in that: The upper and lower tube positioning unit comprises a positioning block (4-6) and a positioning seat (4-7); the positioning seat (4-7) is a T-shaped seat structure, a stud (4-9) is arranged at the tail of the positioning seat (4-7), the stud (4-9) passes through the vertical sliding groove (4-1-1) of the L-shaped support (4-1) and is fixed through a fixing block (4-8) and a locking nut (4-10), and the positioning block (4-6) is installed at both ends of the head of the positioning seat (4-7); an arc-shaped positioning groove matched with the outer surface of the upper and lower tube workpiece is arranged on the positioning block (4-6).

4. The gas-actuated positioning and clamping fixture for welding the front triangle component of a bicycle frame according to claim 3, characterized in that: The upper and lower tube pressing unit comprises a pressing seat (4-3), a rotary air cylinder (4-4) and a upper and lower tube pressing head (4-5); a stud (4-9) is arranged at the tail of the pressing seat (4-3), the stud (4-9) passes through the vertical sliding groove (4-1-1) of the L-shaped support (4-1) and is fixed through a fixing block (4-8) and a locking nut (4-10), the rotary air cylinder (4-4) is installed at the head of the pressing seat (4-3), and the upper and lower tube pressing head (4-5) is installed on the rotary telescopic arm of the rotary air cylinder (4-4).

5. The gas-actuated positioning and clamping tool for welding the front triangle component of a bicycle frame according to claim 4, characterized in that: The head tube positioning and clamping mechanism (3) comprises a head tube positioning block (3-2), an adjustable connecting seat (3-3) and a head tube clamping cylinder (3-1); the head tube positioning block (3-2) is arranged in two groups from top to bottom, V-shaped positioning grooves are arranged on each group of head tube positioning blocks (3-2), and a supporting plate for limiting the height position of the head tube (1-1) is arranged at the bottom of the lower group of head tube positioning blocks; the telescopic arm of the head tube clamping cylinder (3-1) is connected with the head tube positioning block (3-2) through the adjustable connecting seat (3-3).

6. The gas-actuated positioning and clamping fixture for welding the front triangle component of a bicycle frame according to claim 4, characterized in that: The vertical pipe positioning and clamping mechanism (5) is further provided with a U-shaped support (5-4), the two vertical arms of the U-shaped support (5-4) are different in height and are in a state of low in front and high in back, and the vertical pipe upper end pneumatic pressing assembly and the vertical pipe positioning assembly are installed on the vertical arm at the back of the U-shaped support (5-4); the vertical pipe upper end pneumatic pressing assembly comprises a vertical pipe pressing cylinder (5-1) and a vertical pipe pressing head (5-2), the vertical pipe pressing cylinder (5-1) is vertically arranged, and the telescopic arm thereof is used for up-and-down operation, and the vertical pipe pressing head (5-2) is installed on the telescopic arm of the vertical pipe pressing cylinder (5-1).

7. The gas-actuated positioning and clamping fixture for welding the front triangle component of a bicycle frame according to claim 6, characterized in that: The vertical pipe positioning assembly (5-3) comprises two parts arranged from top to bottom, and each part is provided with an arc-shaped positioning groove matched with the outer surface of the vertical pipe (1-3) in the front triangular part of the bicycle frame (1).

8. The gas-actuated positioning and clamping fixture for welding the front triangle component of a bicycle frame according to claim 6, characterized in that: The five-way pipe positioning and clamping mechanism (6) comprises a five-way pipe pneumatic positioning and clamping assembly, a five-way pipe pressing cylinder (6-1) and a five-way pipe pressing head (6-2); the five-way pipe pressing cylinder (6-1) is installed on the front vertical arm of the U-shaped support (5-4) of the vertical pipe positioning and clamping mechanism (5), and the five-way pipe pressing head (6-2) is arranged in two groups in front and back, one group of which is fixedly installed at the lower part of the rear vertical arm of the U-shaped support (5-4) of the vertical pipe positioning and clamping mechanism (5), and the other group is installed on the telescopic arm of the five-way pipe pressing cylinder (6-1).

9. A gas powered positioning and clamping fixture for welding a front triangle component of a bicycle frame as claimed in any one of claims 5 to 8, characterised in that: A group of cylinder action control handles (7) are further arranged on the front vertical surface of the rectangular frame (2-1) of the base (2).

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