Child balance car frame welding tooling

Abstract

A child balance car frame welding tool, including base assembly, reversible platform, first positioning clamping mechanism, second positioning clamping mechanism and third positioning clamping mechanism, the base assembly is equipped with reversible platform, one end of the reversible platform is connected with the driving mechanism arranged in the base assembly, the front and rear through slide rail is arranged on the reversible platform, and a plurality of assembly assembly holes are arranged on the left and right sides of the slide rail, the first positioning clamping mechanism, the second positioning clamping mechanism and the third positioning clamping mechanism are sequentially installed on the reversible platform, and the slide groove matched with the slide rail on the reversible platform and the long hole or the round hole matched with the assembly hole on the reversible platform are arranged at the bottom of the first positioning clamping mechanism, the second positioning clamping mechanism and the third positioning clamping mechanism. The utility model realizes accurate positioning of the child balance car frame, improves the welding quality, reduces the production cost, ensures the reliability and safety of the child balance car product control.

Description

Technical Field

[0001] This utility model relates to the field of bicycle production equipment technology, specifically a welding fixture suitable for children's balance bike frames. Background Technology

[0002] As attached Figure 1 , Figure 2 As shown, a children's balance bike frame 1 comprises a front stem 1-1, a main beam 1-2, a seat tube 1-3, and a rear fork tube 1-4, all of which are assembled into one piece through welding. To ensure the reliability and safety of the children's balance bike, during the welding of the frame 1, according to relevant technical requirements, the central axes of the front stem 1-1, main beam 1-2, and seat tube 1-5 must be located in the same plane (i.e., the central plane of the balance bike frame), and the left and right parts of the rear fork tube are symmetrically arranged relative to the central plane of the balance bike frame. Simultaneously, to accommodate robotic or manual welding operations, the workpiece must be able to rotate at a certain angle to expose the welding area within the range of robotic or manual movement. Furthermore, for children's balance bike frames 1 of different sizes and specifications, the positioning and clamping mechanisms of different parts of the workpiece in the welding fixture must be able to be adjusted in position to improve the versatility of the welding fixture and reduce production costs. Utility Model Content

[0003] This utility model provides a welding fixture for a children's balance bike frame. It aims to achieve accurate positioning of the various components in the children's balance bike frame by cooperating with the base assembly, the flip-up platform, the first positioning clamping mechanism, the second positioning clamping mechanism, and the third positioning clamping mechanism. This will improve the welding quality of the workpiece, reduce production costs, and ensure the reliability and safety of the children's balance bike product.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A welding fixture for a children's balance bike frame includes a base assembly, a flip-up platform, a first positioning clamping mechanism, a second positioning clamping mechanism, and a third positioning clamping mechanism. The base assembly is fixedly installed on a horizontal ground, and the flip-up platform is mounted on top of the base assembly. One end of the flip-up platform is connected to a drive mechanism arranged in the base assembly. A through slide rail is provided on the flip-up platform, and several sets of mounting holes are provided on the left and right sides of the slide rail. The first, second, and third positioning clamping mechanisms are sequentially mounted on the flip-up platform in the front-to-back direction. The bottom of the first, second, and third positioning clamping mechanisms is provided with a groove that mates with the slide rail on the flip-up platform and an elongated or round hole that mates with the mounting holes on the flip-up platform.

[0006] The aforementioned welding fixture for a children's balance bike frame includes a first positioning and clamping mechanism comprising a first front-to-back position adjustment seat, a height adjustment seat, a side-push clamping clamp, an angle adjustment seat, a downward-pressing clamping clamp, and a front upright support. The first front-to-back position adjustment seat is an inverted T-shaped seat. A first positioning and clamping mechanism groove is provided on the bottom surface of the first front-to-back position adjustment seat, and first horizontal elongated holes are provided on the left and right sides of the first positioning and clamping mechanism groove. A first vertical elongated hole is provided on the vertical wall of the first front-to-back position adjustment seat. The height adjustment seat is fitted with the first vertical elongated hole on the first front-to-back position adjustment seat, and a side-push clamping clamp is mounted on the height adjustment seat. The angle adjustment seat is installed at one end of the movable part of the side-push clamping clamp, and a downward-pressing clamping clamp and a front upright support are installed on the angle adjustment seat.

[0007] The aforementioned welding fixture for the children's balance bike frame includes a second positioning and clamping mechanism comprising a second front-rear position adjustment seat, a main beam tube positioning seat, a main beam tube clamping clamp, a seat tube support seat, and a seat tube clamping clamp. The second front-rear position adjustment seat is an inverted T-shaped seat. A second positioning and clamping mechanism groove is provided on the bottom surface of the second front-rear position adjustment seat, and second horizontal elongated holes are provided on both sides of the second positioning and clamping mechanism groove. At least two sets of second vertical elongated holes are provided on the vertical wall of the second front-rear position adjustment seat. The main beam tube positioning seats are in at least two sets, each fitted with one of the second vertical elongated holes. The main beam tube clamping clamp is installed on the vertical wall of the second front-rear position adjustment seat and has an arc-shaped pressure head that matches the arc surface of the outer wall of the main beam tube. The seat tube support seat is arranged on top of the second front-rear position adjustment seat, and a boss that can be embedded into the inner cavity of the seat tube is provided on the top of the seat tube support seat. The seat tube clamping clamp is arranged opposite to the seat tube support seat, and the pressure head of the seat tube clamping clamp is a disc that matches the upper end face of the seat tube.

[0008] The aforementioned welding fixture for the children's balance bike frame includes a seat tube support seat of the second positioning and clamping mechanism that is assembled with a second front and rear position adjustment seat via a first hinge seat. The seat tube support seat is provided with a threaded engagement structure, and the height of the top of the seat tube support seat is adjusted by screwing the threaded engagement structure in or out.

[0009] In the aforementioned welding fixture for children's balance bike frames, the seat tube clamping clamp of the second positioning and clamping mechanism is assembled with the vertical wall of the second front and rear position adjustment seat through an adjustable-angle seat tube clamping clamp seat.

[0010] The aforementioned welding fixture for the children's balance bike frame includes a third positioning and clamping mechanism comprising a third front-to-rear position adjustment seat, a rear fork tube positioning seat, a rear fork tube clamping clamp, and a main beam tube rear end limiting seat. The third front-to-rear position adjustment seat has a horizontal base plate and a vertical wall. The horizontal base plate is a square plate with a sliding groove for the third positioning and clamping mechanism on its bottom surface. Assembly holes for the third front-to-rear position adjustment seat are located at the four corners of the horizontal base plate. The rear fork tube positioning seat is mounted on the top of the vertical wall, and a rear fork tube clamping clamp mounting seat is located behind the vertical wall. The rear fork tube clamping clamp is fixed to the rear fork tube clamping clamp mounting seat. The main beam tube rear end limiting seat is fitted to the vertical wall of the third front-to-rear position adjustment seat.

[0011] The aforementioned welding fixture for the children's balance bike frame, wherein the rear fork tube positioning seat in the third positioning and clamping mechanism consists of two parts, left and right, which are fitted with the third horizontal elongated hole provided on the upper end surface of the vertical wall of the third front and rear position adjustment seat. Each part is provided with an arc-shaped limiting block and a positioning groove; the arc-shaped limiting block matches the front curved part of the rear fork tube; the positioning groove matches the outer wall of the rear circular tube of the rear fork tube.

[0012] In the aforementioned welding fixture for children's balance bike frames, the rear end limiting seat of the main beam tube in the third positioning and clamping mechanism is a semi-circular structure, which is assembled with the vertical wall of the third front and rear position adjustment seat through the second hinge seat.

[0013] This utility model provides a welding fixture for children's balance bike frames. Through the cooperation of a first, second, and third positioning clamping mechanism, it achieves precise positioning and clamping of each component of the children's balance bike frame, ensuring that the central axes of the front upright tube, main beam tube, and seat tube are located within the central plane of the frame, and that the left and right parts of the rear fork tube are symmetrically arranged relative to the central plane of the frame. Furthermore, the fixture, through the cooperation of a base and a flip-up platform, enables the workpiece to be rotated within a certain angle range, exposing the welding area to the range of robot or manual operation, thus facilitating robotic and manual welding operations. Additionally, the fixture utilizes the cooperation of the bottom sliding grooves of the first, second, and third positioning clamping mechanisms with the slide rails on the flip-up platform, and the coordination of the position adjustment components within these mechanisms, to adapt to children's balance bike frame workpieces of different sizes and specifications, giving it good versatility. In summary, this utility model achieves accurate positioning of each component in the frame of a children's balance bike, thereby improving the welding quality of the workpiece, reducing production costs, and ensuring the reliability and safety of the children's balance bike in operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the frame structure of the children's balance bike involved in this utility model;

[0015] Figure 2 yes Figure 1 K-direction view;

[0016] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 4 yes Figure 3 K-direction view;

[0018] Figure 5 This is a schematic diagram of the first positioning and clamping mechanism;

[0019] Figure 6 This is a schematic diagram of the second positioning and clamping mechanism;

[0020] Figure 7 This is a schematic diagram of the third positioning and clamping mechanism;

[0021] Figure 8 yes Figure 7 Schematic diagram after rotation around the vertical axis;

[0022] Figure 9 This is a schematic diagram of the working state of this utility model;

[0023] Figure 10 yes Figure 9 The K-direction view.

[0024] Explanation of each label in the diagram:

[0025] 1 is the frame of the children's balance bike, 1-1 is the front stem tube, 1-2 is the main beam tube, 1-3 is the seat tube, and 1-4 is the rear fork tube.

[0026] 2 refers to the base assembly;

[0027] 3 is a reversible platform, 3-1 is a slide rail, and 3-2 is an assembly hole;

[0028] 4 is the first positioning and clamping mechanism, 4-1 is the first front and rear position adjustment seat, 4-1-1 is the slide groove of the first positioning and clamping mechanism, 4-1-2 is the first horizontal elongated hole, 4-1-3 is the first vertical elongated hole, 4-2 is the height adjustment seat, 4-3 is the side push type clamping clamp, 4-4 is the angle adjustment seat, 4-5 is the downward pressing type clamping clamp, and 4-6 is the front riser support.

[0029] 5 is the second positioning and clamping mechanism, 5-1 is the second front and rear position adjustment seat, 5-1-1 is the slide groove of the second positioning and clamping mechanism, 5-1-2 is the second horizontal elongated hole, 5-1-3 is the second vertical elongated hole, 5-2 is the main beam tube positioning seat, 5-3 is the arc-shaped pressure head, 5-4 is the main beam tube clamping clamp, 5-5 is the seat tube clamping clamp, 5-6 is the pressure head of the seat tube clamping clamp, 5-7 is the seat tube support seat, 5-8 is the first hinge seat, and 5-9 is the seat tube clamping clamp seat.

[0030] 6 is the third positioning and clamping mechanism, 6-1 is the third front and rear position adjustment seat, 6-1-1 is the slide groove of the third positioning and clamping mechanism, 6-1-2 is the assembly hole of the third front and rear position adjustment seat, 6-1-3 is the third horizontal elongated hole, 6-1-4 is the rear fork tube clamping clamp mounting seat, 6-2 is the rear fork tube positioning seat, 6-2-1 is the arc-shaped limiting block, 6-2-2 is the positioning groove, 6-3 is the pressure head of the rear fork tube clamping clamp, 6-4 is the rear fork tube clamping clamp, 6-5 is the rear end limiting seat of the main beam tube, and 6-6 is the second hinge seat. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] See Figure 1. Figure 2 A children's balance bike frame 1 is provided, comprising a front stem 1-1, a main beam 1-2, a seat tube 1-3, and a rear fork tube 1-4, all of which are assembled together by welding. To ensure the reliability and safety of the children's balance bike, during the welding of the frame 1, according to relevant technical requirements, the central axes of the front stem 1-1, main beam 1-2, and seat tube 1-3 must be located in the same plane (i.e., the central plane of the balance bike frame), and the left and right parts of the rear fork tube are symmetrically arranged relative to the central plane of the balance bike frame. Simultaneously, to accommodate robotic welding operations, the workpiece must be able to rotate at a certain angle to expose the welding area within the robot's range of motion. Furthermore, for children's balance bike frames 1 of different sizes and specifications, the positioning and clamping mechanisms of different parts of the workpiece in the welding fixture must be able to be adjusted in position to improve the versatility of the welding fixture and reduce production costs.

[0033] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 To ensure Figure 1 , Figure 2The present invention provides a welding fixture for a child balance bike frame 1, which allows for rapid and precise positioning of various parts during the welding process. The fixture includes a base assembly 2, a flip-up platform 3, a first positioning and clamping mechanism 4, a second positioning and clamping mechanism 5, and a third positioning and clamping mechanism 6. The base assembly 2 is fixedly installed on a horizontal ground, and the flip-up platform 3 is mounted on top of the base assembly 2. The flip-up platform 3 adopts a cantilever beam structure, with one end connected to a drive mechanism arranged in the base assembly 2 and the other end being a free end. A through-rail slide 3-1 is provided on the flip-up platform 3. Several sets of mounting holes 3-2 are provided on the left and right sides of the rail 3-1; the first positioning clamping mechanism 4, the second positioning clamping mechanism 5 and the third positioning clamping mechanism 6 are installed sequentially on the flipping platform 3 in the front-back direction, and the bottom of the first positioning clamping mechanism 4, the second positioning clamping mechanism 5 and the third positioning clamping mechanism 6 are provided with sliding grooves that cooperate with the sliding rail 3-1 on the flipping platform 3. The bottom of the first positioning clamping mechanism 4 and the second positioning clamping mechanism 5 are provided with elongated holes that cooperate with the mounting holes 3-2 on the flipping platform 3, and the bottom of the third positioning clamping mechanism 6 is provided with round holes that cooperate with the mounting holes 3-2 on the flipping platform 3.

[0034] The specific structures of the first positioning and clamping mechanism 4, the second positioning and clamping mechanism 5, and the third positioning and clamping mechanism 6 are described in detail below:

[0035] See Figure 3 , Figure 4 , Figure 5 The welding fixture for the children's balance bike frame of this utility model includes a first positioning and clamping mechanism 4 comprising a first front-rear position adjustment seat 4-1, a height adjustment seat 4-2, a side-push clamping clamp 4-3, an angle adjustment seat 4-4, a downward-pressing clamping clamp 4-5, and a front stand support 4-6. The first front-rear position adjustment seat 4-1 is an inverted T-shaped seat. A first positioning and clamping mechanism groove 4-1-1 is provided on the bottom surface of the first front-rear position adjustment seat 4-1, and first horizontal elongated holes 4-1-2 are provided on the left and right sides of the first positioning and clamping mechanism groove 4-1-1. The vertical wall of the adjustment seat 4-1 is provided with a first vertical elongated hole 4-1-3; the height adjustment seat 4-2 is fitted with the first vertical elongated hole 4-1-3 on the first front and rear position adjustment seat 4-1, and a side-push type clamping pliers 4-3 is installed on the height adjustment seat 4-2; the angle adjustment seat 4-4 is installed at one end of the movable part of the side-push type clamping pliers 4-3, and a downward-pressing type clamping pliers 4-5 and a front upright support 4-6 are installed on the angle adjustment seat 4-4. The front upright 1-1 of the child balance bike frame 1 is positioned and pressed by the cooperation of the downward-pressing type clamping pliers 4-5 and the front upright support 4-6.

[0036] See Figure 3 , Figure 4 , Figure 6The welding fixture for the children's balance bike frame described in this utility model includes a second positioning and clamping mechanism 5 comprising a second front-rear position adjustment seat 5-1, a main beam tube positioning seat 5-2, a main beam tube clamping clamp 5-4, a seat tube support seat 5-7, and a seat tube clamping clamp 5-5. The second front-rear position adjustment seat 5-1 is an inverted T-shaped seat, and a second positioning and clamping mechanism groove 5-1-1 is provided on the bottom surface of the second front-rear position adjustment seat 5-1. 1. A second horizontal elongated hole 5-1-2 is provided on both the left and right sides. At least two sets of second vertical elongated holes 5-1-3 are provided on the vertical wall of the second front-rear position adjustment seat 5-1. The main beam tube positioning seat 5-2 is not less than two sets, which are respectively fitted with the second vertical elongated holes 5-1-3. The main beam tube clamping clamp 5-4 is installed on the vertical wall of the second front-rear position adjustment seat 5-1 and is provided with an arc-shaped pressure head 5-3 that matches the arc surface of the outer wall of the main beam tube 1-2. The seat tube support seat 5-7 is arranged on the second front-rear position adjustment seat 5-1 and is assembled with the second front-rear position adjustment seat 5-1 through a first hinge seat 5-8. The seat tube support seat 5-7 is provided with a threaded engagement structure. The height of the top of the seat tube support seat 5-7 is adjusted by screwing in or out of the threaded engagement structure. The top of the seat tube support seat 5-7 is provided with a boss that can be embedded in the inner cavity of the seat tube. The seat tube clamping clamp 5-5 is connected to the second front-rear position adjustment seat 5-1 through an adjustable angle seat tube clamping clamp seat 5-9. The vertical wall of the adjusting seat 5-1 is assembled and arranged vertically opposite to the seat tube support seat 5-7. The pressure head 5-6 of the seat tube clamping pliers is a stepped disc that matches the upper end face of the seat tube 1-3. The bottom of the pressure head 5-6 of the seat tube clamping pliers is a small diameter end that can be embedded in the inner cavity of the seat tube 1-3. Therefore, when the seat tube clamping pliers 5-5 are clamped, the upper and lower ends of the seat tube 1-3 are positioned and clamped by the pressure head 5-6 of the seat tube clamping pliers and the top boss of the seat tube support seat 5-7, respectively.

[0037] See Figure 3 , Figure 4 , Figure 7 , Figure 8The welding fixture for the children's balance bike frame of this utility model includes a third positioning and clamping mechanism 6 comprising a third front-rear position adjustment seat 6-1, a rear fork tube positioning seat 6-2, a rear fork tube clamping clamp 6-4, and a main beam tube rear end limiting seat 6-5. The third front-rear position adjustment seat 6-1 has a horizontal base plate and a vertical wall. The horizontal base plate is a square plate with a third positioning and clamping mechanism slide groove 6-1-1 on its bottom surface. Third front-rear position adjustment seat assembly holes 6-1-2 are located at the four corners of the horizontal base plate. The rear fork tube positioning seat 6-2 is mounted on the top of the vertical wall, and the rear fork tube clamping clamp mounting seat 6-1-4 is located behind the vertical wall. The rear fork tube positioning seat 6-2 consists of two parts, left and right, which are connected to the third front-rear position adjustment seat 6-1. The third horizontal elongated hole 6-1-3 is provided on the upper end face of the vertical wall of the entire 6-1. An arc-shaped limiting block 6-2-1 and a positioning groove 6-2-2 are respectively provided in each part. The arc-shaped limiting block 6-2-1 matches the front curved part of the rear fork tube 1-4, and the positioning groove 6-2-2 matches the outer wall of the rear circular tube of the rear fork tube 1-4. The rear fork tube clamping clamp 6-4 is fixed on the rear fork tube clamping clamp mounting seat 6-1-4. The clamping head 6-3 of the rear fork tube clamping clamp cooperates with the rear fork tube positioning seat 6-2 to position and clamp the left and right parts of the rear fork tube 1-4. The rear end limiting seat 6-5 of the main beam tube is a semi-circular structure, which is assembled with the vertical wall of the third front and rear position adjustment seat 6-1 through the second hinge seat 6-6.

[0038] See Figures 1 to 10When welding the frame of a children's balance bike using this invention, the third front-rear position adjustment seat 6-1 of the third positioning clamping mechanism 6 is adjusted to a suitable position. A bolt assembly is then used to pass through the mounting holes 6-1-2 of the third front-rear position adjustment seat and the corresponding mounting holes 3-2 on the flip-up platform 3, fixing the third front-rear position adjustment seat 6-1 onto the flip-up platform 3. The main beam tube 1-2 workpiece is then mounted on the main beam tube positioning seat 5-2 of the second positioning clamping mechanism 5. The second front-rear position adjustment seat 5-2 of the second positioning clamping mechanism 5 is then adjusted. -1. Position the main beam tube 1-2 so that its rear end abuts against the semi-circular structure of the main beam tube rear end limiting seat 6-5. Fix the second front and rear position adjusting seat 5-1 to the flip-up platform. Press down the main beam tube clamping clamp 5-4 and use the arc-shaped clamping head 5-3 to position and clamp the main beam tube 1-2. Place the front riser tube 1-1 workpiece on the front riser tube support 4-6 and use the downward clamping clamp 4-5 to clamp and fix the front riser tube 1-1. Adjust the angle adjusting seat to a suitable angle, and then adjust the first front and rear position adjusting seat in the first positioning and clamping mechanism 4. Position seat 4-1 to the appropriate position, close the side-push clamping 4-3, so that the front riser 1-1 contacts the front end of the main beam tube 1-2; adjust the seat tube support 5-7 in the second positioning clamping mechanism 5 to the set angle and lock it in place, fit the lower end of the seat tube 1-3 onto the top protrusion of the seat tube support 5-7, and press the upper end of the seat tube 1-3 in place by the clamping head 5-6 of the seat tube clamping pliers; finally, place the left and right parts of the rear fork tube 1-4 on the rear fork tube positioning seat 6-2 of the third positioning clamping mechanism 6, so that the front bent part of the rear fork tube 1-4 abuts against the rear fork. The rear round tube is embedded in the positioning groove 6-2-2 of the rear fork tube positioning seat 6-2 inside the arc-shaped limiting block 6-2-1 of the tube positioning seat 6-2. Then the rear fork tube clamping clamp 6-4 is closed, and the rear fork tube 1-4 is clamped and fixed by the clamping head 6-3 of the rear fork tube clamping clamp. This completes the positioning and clamping operation of the workpiece to be welded. Then the robot or manual welding of the children's balance bike frame 1 is carried out. During the welding process, the welding part is exposed within the range of robot or manual action by flipping the flip platform 3, so as to reduce the difficulty of the welding operation.

Claims

1. A welding fixture for a children's balance bike frame, characterized in that: The system includes a base assembly (2), a flip platform (3), a first positioning clamping mechanism (4), a second positioning clamping mechanism (5), and a third positioning clamping mechanism (6). The base assembly (2) is fixedly installed on a horizontal ground, and the flip platform (3) is mounted on the top of the base assembly (2). One end of the flip platform (3) is connected to a drive mechanism arranged in the base assembly (2). A slide rail (3-1) is provided on the flip platform (3) with a front-to-back passage, and several sets of mounting holes (3-2) are provided on the left and right sides of the slide rail (3-1). The first positioning clamping mechanism (4), the second positioning clamping mechanism (5), and the third positioning clamping mechanism (6) are installed sequentially on the flip platform (3) in the front-to-back direction. The bottom of the first positioning clamping mechanism (4), the second positioning clamping mechanism (5), and the third positioning clamping mechanism (6) is provided with a groove that cooperates with the slide rail (3-1) on the flip platform (3) and a long hole or round hole that cooperates with the mounting hole (3-2) on the flip platform (3).

2. The welding fixture for a children's balance bike frame according to claim 1, characterized in that: The first positioning and clamping mechanism (4) includes a first front-rear position adjustment seat (4-1), a height adjustment seat (4-2), a side-push clamping clamp (4-3), an angle adjustment seat (4-4), a downward-pressing clamping clamp (4-5), and a front riser support (4-6); the first front-rear position adjustment seat (4-1) is an inverted T-shaped seat, and a first positioning and clamping mechanism slide groove (4-1-1) is provided on the bottom surface of the first front-rear position adjustment seat (4-1), and first horizontal elongated holes (4-1-1) are provided on the left and right sides of the first positioning and clamping mechanism slide groove (4-1-1). 1-2), a first vertical elongated hole (4-1-3) is provided on the vertical wall of the first front and rear position adjustment seat (4-1); the height adjustment seat (4-2) is fitted with the first vertical elongated hole (4-1-3) on the first front and rear position adjustment seat (4-1), and a side-push type clamping pliers (4-3) are installed on the height adjustment seat (4-2); the angle adjustment seat (4-4) is installed on one end of the movable part of the side-push type clamping pliers (4-3), and a downward-pressing type clamping pliers (4-5) and a front riser support (4-6) are installed on the angle adjustment seat (4-4).

3. The welding fixture for a children's balance bike frame according to claim 1 or 2, characterized in that: The second positioning and clamping mechanism (5) includes a second front and rear position adjustment seat (5-1), a main beam tube positioning seat (5-2), a main beam tube clamping clamp (5-4), a seat tube support seat (5-7), and a seat tube clamping clamp (5-5); the second front and rear position adjustment seat (5-1) is an inverted T-shaped seat, and a second positioning and clamping mechanism slide groove (5-1-1) is provided on the bottom surface of the second front and rear position adjustment seat (5-1), and second horizontal elongated holes (5-1-2) are provided on the left and right sides of the second positioning and clamping mechanism slide groove (5-1-1), and at least two sets of second vertical elongated holes (5-1-3) are provided on the vertical wall of the second front and rear position adjustment seat (5-1); The main beam tube positioning seat (5-2) is in the number of no less than two sets, which are respectively fitted with the second vertical elongated hole (5-1-3); the main beam tube clamping clamp (5-4) is installed on the vertical wall of the second front and rear position adjustment seat (5-1), and is provided with an arc-shaped pressure head (5-3) that matches the arc surface of the outer wall of the main beam tube (1-2); the seat tube support seat (5-7) is arranged on the second front and rear position adjustment seat (5-1), and the top of the seat tube support seat (5-7) is provided with a boss that can be embedded in the inner cavity of the seat tube; the seat tube clamping clamp (5-5) is arranged opposite to the seat tube support seat (5-7), and the pressure head (5-6) of the seat tube clamping clamp is a disc that matches the upper end face of the seat tube.

4. The welding fixture for a children's balance bike frame according to claim 3, characterized in that: The seat tube support (5-7) of the second positioning clamping mechanism (5) is assembled with the second front and rear position adjustment seat (5-1) through the first hinge seat (5-8). A threaded engagement structure is provided in the seat tube support (5-7). The height of the top of the seat tube support (5-7) is adjusted by screwing in or out of the threaded engagement structure.

5. The welding fixture for a children's balance bike frame according to claim 4, characterized in that: The seat tube clamping pliers (5-5) of the second positioning clamping mechanism (5) are assembled with the vertical wall of the second front and rear position adjusting seat (5-1) through the adjustable angle seat tube clamping pliers seat (5-9).

6. The welding fixture for a children's balance bike frame according to claim 5, characterized in that: The third positioning and clamping mechanism (6) includes a third front-rear position adjustment seat (6-1), a rear fork tube positioning seat (6-2), a rear fork tube clamping clamp (6-4), and a main beam tube rear end limiting seat (6-5). The third front-rear position adjustment seat (6-1) is provided with a horizontal base plate and a vertical wall. The horizontal base plate is a square plate. A third positioning and clamping mechanism slide groove (6-1-1) is provided on the bottom surface of the horizontal base plate. Assembly holes (6-1-2) for the third front-rear position adjustment seat are provided at the four corners of the horizontal base plate. The rear fork tube positioning seat (6-2) is mounted on the top of the vertical wall. A rear fork tube clamping clamp mounting seat (6-1-4) is provided behind the vertical wall. The rear fork tube clamping clamp (6-4) is fixed on the rear fork tube clamping clamp mounting seat (6-1-4). The main beam tube rear end limiting seat (6-5) is fitted with the vertical wall of the third front-rear position adjustment seat (6-1).

7. The welding fixture for a children's balance bike frame according to claim 1, characterized in that: The rear fork tube positioning seat (6-2) in the third positioning and clamping mechanism (6) consists of two parts, left and right, which are fitted with the third horizontal elongated hole (6-1-3) provided on the upper surface of the vertical wall of the third front and rear position adjustment seat (6-1). An arc-shaped limiting block (6-2-1) and a positioning groove (6-2-2) are respectively provided in each part. The arc-shaped limiting block (6-2-1) matches the front end bent tube part of the rear fork tube (1-4). The positioning groove (6-2-2) matches the rear end round tube outer wall of the rear fork tube (1-4).

8. The welding fixture for a children's balance bike frame according to claim 6, characterized in that: The third positioning and clamping mechanism (6) has a semi-circular structure for the rear end limiting seat (6-5) of the main beam tube, which is assembled with the vertical wall of the third front and rear position adjustment seat (6-1) through the second hinge seat (6-6).

Images