A lithium battery stroller front frame and rear frame assembly welding tool

Abstract

A kind of lithium battery stroller front frame and rear frame assembly welding tool, be equipped with base, front frame positioning clamping device, upper fork assembly positioning clamping device, lower fork pipe positioning clamping device and ear piece positioning clamping device;The base is horizontally arranged, is assembled on base front frame positioning clamping device, upper fork assembly positioning clamping device, lower fork pipe positioning clamping device and ear piece positioning clamping device;The front frame positioning clamping device includes two front frame vertical pipe positioning and compressing unit with front vertical pipe and seat pipe cooperation, battery mounting seat assembly positioning unit;Upper fork assembly positioning clamping device and two front frame vertical pipe positioning and compressing unit are installed in the rear side edge portion of base, sequentially arranged along left and right direction;Lower fork pipe positioning clamping device, ear piece positioning clamping device and battery mounting seat assembly positioning clamping unit are arranged along the central axis of base left and right direction.The utility model discloses above technical means, improves the welding product quality and general performance of tool equipment.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically a welding fixture for assembling the front and rear frames of a lithium battery stroller. Background Technology

[0002] As attached Figure 1 , Figure 2 As shown, a frame assembly 1 of a children's bicycle equipped with a lithium battery includes a front frame 1-1 and a rear frame. The front frame 1-1 is welded together by a front seat tube 1-1-1, a brace tube 1-1-2, a connecting tube 1-1-3, a seat tube 1-1-4, and a battery mounting bracket assembly 1-1-5. The rear frame is composed of an upper fork assembly 1-2 and a lower fork assembly 1-3. The upper fork assembly 1-2 is welded together by two upper fork tubes 1-2-1 and a short cross tube 1-2-2. The lower fork assembly 1-3 is a split structure, including two symmetrical parts. In each part, a lower fork tube 1-3-1 and a lug 1-3-2 are welded together. The lug 1-3-2 is provided with a notch 1-3-2-1 that mates with the rear wheel axle of the lithium battery children's bicycle.

[0003] The lithium battery children's bicycle is a newly developed product, requiring innovative design of its frame assembly welding fixture. According to the frame assembly welding process requirements, the welding of the front frame 1-1, the upper fork assembly 1-2 and the lower fork assembly 1-3 of the rear frame are completed first. Then, the front frame 1-1, the upper fork assembly 1-2 and the lower fork assembly 1-3 of the rear frame are positioned and clamped by the front frame and rear frame welding fixture, and then the welding operation is carried out according to the operating procedures. Utility Model Content

[0004] This utility model provides a welding fixture for assembling the front and rear frames of a lithium battery-powered children's stroller. The purpose is to ensure the stability of the relative positions of the welded workpieces and improve the welding quality of the frame assembly by ensuring the reliable positioning and clamping of each component in the welding fixture. By adjusting the positions of each component in the welding fixture, the general performance of the tooling equipment can be improved.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A welding fixture for assembling the front and rear frames of a lithium battery-powered children's bicycle includes a base, a front frame positioning and clamping device, an upper fork assembly positioning and clamping device, a lower fork tube positioning and clamping device, and an ear piece positioning and clamping device. The base is horizontally arranged, and the front frame positioning and clamping device, upper fork assembly positioning and clamping device, lower fork tube positioning and clamping device, and ear piece positioning and clamping device are mounted on the base. The front frame positioning and clamping device includes two front frame seat tube positioning and clamping units that respectively cooperate with the front seat tube and seat tube, and a battery mounting bracket assembly positioning unit. The upper fork assembly positioning and clamping device and the two front frame seat tube positioning and clamping units are installed on the rear edge of the base and arranged sequentially in the left-right direction. The lower fork tube positioning and clamping device, ear piece positioning and clamping device, and battery mounting bracket assembly positioning and clamping unit are arranged along the central axis of the base in the left-right direction.

[0006] The aforementioned welding fixture for assembling the front and rear frames of the lithium battery-powered children's bicycle includes a first mounting base, a first vertical position adjustment base, an upper fork tube bracket, an upper fork tube limiting block, an upper fork tube pressure plate, and a first downward-pressing clamp. The first mounting base is fitted with a base, and the first vertical position adjustment base is mounted on the first mounting base. The upper fork tube bracket is assembled with the first vertical position adjustment base via a first pin and locking bolt assembly. Two sets of upper fork tube limiting blocks and the first downward-pressing clamp are provided on the upper fork tube bracket. The upper fork tube pressure plate is installed at the lower end of the pressure head of the first downward-pressing clamp. The upper fork tube pressure plate and the upper fork tube limiting block are arranged vertically opposite each other.

[0007] The aforementioned welding fixture for assembling the front and rear frames of the lithium battery-powered children's stroller includes a lower fork tube positioning and clamping device comprising a second mounting base, a first angle adjusting base, a first angle adjusting base locking sleeve, a second angle adjusting base, a lower fork tube bracket, a lower fork tube limiting post, a lower fork tube pressure plate, and pressure plate locking screws. The second mounting base is fitted to the base, and the first angle adjusting base is mounted at the center of the second mounting base. The first angle adjusting base is rotatable around a vertical axis and is locked in place by the first angle adjusting base locking sleeve. The first angle adjusting base locking sleeve is an open sleeve with a locking pin at the opening. The second angle adjusting base... The second angle adjustment seat is hinged to the first angle adjustment seat via a second pin. The second angle adjustment seat can rotate around the horizontally arranged second pin and is locked in place by a locking pin. A lower fork tube bracket is installed on the upper end of the second angle adjustment seat. The lower fork tube bracket has a boss structure in the middle and sliding grooves on both sides of the boss. The lower fork tube limiting posts are symmetrically arranged on the left and right, with two sets on each side, and their lower ends are placed in the sliding grooves of the lower fork tube bracket. The lower fork tube pressure plate is placed on the boss structure of the lower fork tube bracket and is fixedly assembled with the lower fork tube bracket by pressure plate locking screws. The lower fork tube limiting post clearance holes are provided on the lower fork tube pressure plate.

[0008] The aforementioned welding fixture for the front and rear frames of the lithium battery stroller includes a second angle adjustment seat consisting of two parts, an upper and a lower part, arranged opposite to each other and connected as a whole by a locking pin. A second pin through hole is provided at the joint surface of the upper and lower parts.

[0009] The aforementioned welding fixture for assembling the front and rear frames of the lithium battery-powered children's stroller includes a lower fork tube limiting post assembly hole on the bottom surface of the slide groove of the lower fork tube bracket. The lower fork tube limiting post assembly hole is an elongated hole extending along the central axis of the slide groove. The lower fork tube limiting post is a cylindrical structure with a guide conical surface at the top. The lower fork tube limiting post is assembled with the lower fork tube bracket by a screw passing through the elongated hole on the bottom surface of the slide groove of the lower fork tube bracket.

[0010] The aforementioned welding fixture for assembling the front and rear frames of the lithium battery-powered stroller includes a lug positioning and clamping device comprising a third mounting base, a second vertical position adjustment base, a third angle adjustment base, a lug positioning base, and a side-push caliper. The third mounting base is fitted to the base, and the second vertical position adjustment base is mounted on the upper part of the third mounting base. The third angle adjustment base is assembled with the second vertical position adjustment base via a horizontally arranged third pin. The third angle adjustment base can rotate around the horizontally arranged third pin and is locked in place by a locking pin. The entire frame is equipped with ear plate positioning seats and side-push calipers; two sets of ear plate positioning seats and side-push calipers are symmetrically arranged. Each set of ear plate positioning seats is provided with an ear plate slot, a side-push caliper plug through hole and an ear plate positioning hole. The two sets of side-push calipers are arranged on the outside of the two sets of ear plate positioning seats. The plug of the side-push caliper is a stepped shaft positioning pin. The stepped shaft positioning pin passes through the side-push caliper plug through hole, the ear plate slot and the slot positioning hole, and cooperates with the notch provided on the ear plate to lock the ear plate placed in the ear plate slot.

[0011] The aforementioned welding fixture for the front and rear frames of the lithium battery stroller includes a third angle adjustment seat consisting of two parts arranged opposite to each other and connected as one unit by locking pins. A third pin through hole is provided at the joint surface of the two parts.

[0012] The aforementioned welding fixture for the front and rear frames of the lithium battery-powered children's bicycle has a base with a slide rail running through it from left to right, and several mounting holes that respectively cooperate with the front frame positioning clamping device, the upper fork assembly positioning clamping device, the lower fork tube positioning clamping device, and the lug positioning clamping device. Correspondingly, the bottom of the front frame positioning clamping device, the upper fork assembly positioning clamping device, the lower fork tube positioning clamping device, and the lug positioning clamping device has a slider that cooperates with the slide rail on the base, and also has an elongated hole that cooperates with the mounting holes on the base to adjust the left and right positions.

[0013] This utility model provides a welding fixture for assembling the front and rear frames of a lithium battery-powered children's bicycle. It uses a front frame positioning and clamping device to clamp and position the welded front frame, and uses upper fork assembly positioning and clamping devices, lower fork tube positioning and clamping devices, and lug positioning and clamping devices to clamp and position the upper and lower fork assemblies in the rear frame, ensuring reliable positioning and clamping of components during the frame assembly welding process. However, since the upper and lower fork tubes of the rear frame are arranged at an angle, adjusting the front and rear positions of the upper fork assembly positioning and clamping devices, lower fork tube positioning and clamping devices, and lug positioning and clamping devices also involves adjusting the height and tilt angle. Therefore, the upper fork assembly positioning and clamping device of this utility model is equipped with a first mounting seat that can move left and right, a first vertical position adjustment seat that can move up and down, and an upper fork tube bracket that can be angle-adjusted, thereby realizing the adjustment of the upper fork assembly's posture and clamping position; the lower fork tube positioning and clamping device is equipped with a first mounting seat that can move left and right, a first vertical position adjustment seat that can move up and down, and an upper fork tube bracket that can be angle-adjusted, thereby realizing the adjustment of the upper fork assembly's posture and clamping position; the lower fork tube positioning and clamping device is equipped with a first mounting seat that can move left and right, a first vertical position adjustment seat that can move up and down, and an upper fork tube bracket that can be angle-adjusted. The second mounting seat, which moves left and right, and the lower fork tube positioning and clamping device, through the cooperation of the first angle adjusting seat, the first angle adjusting seat locking sleeve, the second angle adjusting seat, and the lower fork tube bracket, achieve adjustment of the posture and clamping position of the two parts of the split lower fork assembly. The lug positioning and clamping device is equipped with a third mounting seat that can move left and right, a second vertical position adjusting seat that can move up and down, and a third angle adjusting seat that can be angled. Through the cooperation of the lug positioning seat and the side-push caliper, the posture and clamping position of the two sets of lugs in the lower fork assembly are adjusted. In summary, this utility model, through the above technical means, ensures the stability of the relative position of the welded workpiece, improves the quality of the welded product, and enhances the versatility of the welding fixture by adjusting the positions of each component in the welding fixture. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the frame structure of a lithium battery-powered children's stroller; Figure 2 yes Figure 1 A schematic diagram of the disassembled frame structure of a children's stroller powered by lithium batteries; Figure 3 A schematic diagram of the overall structure of this utility model; Figure 4 yes Figure 3 K-direction view; Figure 5 This is a schematic diagram of the upper fork assembly positioning and clamping device. Figure 6 yes Figure 5 K-direction view; Figure 7 This is a schematic diagram of the lower fork tube positioning and clamping device. Figure 8 yes Figure 7 K-direction view; Figure 9 yes Figure 8Schematic diagram of the cross-sectional structure of the middle AA section; Figure 10 This is a schematic diagram of the ear plate positioning and clamping device. Figure 11 yes Figure 10 K-direction view; Figure 12 yes Figure 4 Schematic diagram of the cross-sectional structure of JJ.

[0015] Explanation of each label in the diagram: 1 is the frame assembly 1-1 is the front frame, 1-1-1 is the front riser tube, 1-1-2 is the diagonal brace tube, 1-1-3 is the connecting tube, 1-1-4 is the seat post, and 1-1-5 is the battery mounting bracket. 1-2 is the upper fork assembly, 1-2-1 is the upper fork tube, and 1-2-2 is the short cross tube. 1-3 is the lower fork assembly, 1-3-1 is the lower fork tube, 1-3-2 is the lug, and 1-3-2-1 is the notch; 2 is the base, 2-1 is the slide rail, and 2-2 is the mounting hole; 3 is the front frame positioning and clamping device, 3-1 is the front frame riser positioning and clamping unit, and 3-2 is the battery mounting bracket positioning unit. 4 is the positioning and clamping device for the upper fork assembly. 4-1 is the first mounting base, 4-2 is the first up-down position adjustment base, 4-3 is the upper fork tube bracket, 4-4 is the upper fork tube limit block, 4-5 is the upper fork tube pressure plate, 4-6 is the first downward pressing clamp, 4-7 is the first pin, and 4-8 is the locking bolt assembly. 5 is the lower fork tube positioning and clamping device. 5-1 is the second mounting base, 5-2 is the locking sleeve of the first angle adjustment base, 5-3 is the first angle adjustment base, 5-4 is the second angle adjustment base, 5-5 is the second pin, 5-6 is the lower fork tube bracket, 5-6-1 is the slide groove, 5-6-2 is the mounting hole of the lower fork tube limiting post, 5-7 is the lower fork tube limiting post, 5-8 is the lower fork tube pressure plate, 5-8-1 is the lower fork tube limiting post clearance hole, and 5-9 is the pressure plate locking screw. 6 is the ear plate positioning and clamping device. 6-1 is the third mounting base, 6-2 is the second vertical position adjustment base, 6-3 is the third angle adjustment base, 6-4 is the third pin, 6-5 is the lug positioning base, 6-5-1 is the lug slot, 6-5-2 is the through hole for the side-push caliper plug, 6-5-3 is the lug positioning hole, 6-6 is the side-push caliper, and 6-6-1 is the stepped shaft positioning pin. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] See Figure 1. Figure 2 A frame assembly 1 for a children's bicycle equipped with a lithium battery includes a front frame 1-1 and a rear frame. The front frame 1-1 is welded together by a front seat tube 1-1-1, a diagonal brace tube 1-1-2, a connecting tube 1-1-3, a seat tube 1-1-4, and a battery mounting bracket assembly 1-1-5. The rear frame is composed of an upper fork assembly 1-2 and a lower fork assembly 1-3. The upper fork assembly 1-2 is welded together by two upper fork tubes 1-2-1 and a short cross tube 1-2-2. The lower fork assembly 1-3 is a split structure, including two symmetrically arranged parts. In each part, a lower fork tube 1-3-1 and a lug 1-3-2 are welded together. The lug 1-3-2 is provided with a notch 1-3-2-1 that mates with the rear wheel axle of the lithium battery children's bicycle. Since the lithium battery children's bicycle is a newly developed product, it is necessary to innovate the design of the welding fixture for its frame assembly. According to the welding process requirements of frame assembly 1, the welding of the front frame 1-1, the upper fork assembly 1-2 and the lower fork assembly 1-3 of the rear frame must be completed first. Then, the front frame 1-1, the upper fork assembly 1-2 and the lower fork assembly 1-3 of the rear frame are positioned and clamped by the welding fixture for the front frame and the rear frame respectively. Finally, the welding operation is carried out according to the operating procedures.

[0018] See Figure 1 , Figure 2 , Figure 3 , Figure 4This utility model provides a welding fixture for assembling the front and rear frames of a lithium battery-powered children's bicycle. It includes a base 2, a front frame positioning and clamping device 3, an upper fork assembly positioning and clamping device 4, a lower fork tube positioning and clamping device 5, and an earpiece positioning and clamping device 6. The base 2 is horizontally arranged, and the front frame positioning and clamping device 3, upper fork assembly positioning and clamping device 4, lower fork tube positioning and clamping device 5, and earpiece positioning and clamping device 6 are mounted on the base 2. To allow for adjustment of the left and right positions of these devices, and to accommodate welding operations of lithium battery-powered children's bicycle frame assemblies 1 of different sizes, the base 2 is provided with a horizontally extending slide rail 2-1, and several mounting holes 2-2 that respectively mate with the front frame positioning and clamping device 3, upper fork assembly positioning and clamping device 4, lower fork tube positioning and clamping device 5, and earpiece positioning and clamping device 6. Correspondingly, the bottom of the front frame positioning clamping device 3, the upper fork assembly positioning clamping device 4, the lower fork tube positioning clamping device 5, and the lug positioning clamping device 6 is provided with a slider that cooperates with the slide rail 2-1 on the base 2, and also with an elongated hole that can adjust the left and right position and cooperates with the mounting hole 2-2 on the base 2. The slider is a structure in which the bottom of each of the above positioning clamping devices protrudes downward. The front frame positioning clamping device 3 includes two front frame stem tube positioning and clamping units 3-1 that cooperate with the front stem tube 1-1-1 and the seat tube 1-1-4 respectively, and also includes a battery mounting bracket assembly positioning unit 3-2. The upper fork assembly positioning clamping device 4 and the two front frame stem tube positioning and clamping units 3-1 are installed on the rear edge of the base 2 and arranged sequentially in the left and right direction. The lower fork tube positioning clamping device 5, the lug positioning clamping device 6, and the battery mounting bracket assembly positioning clamping unit 3-2 are arranged along the central axis of the left and right direction of the base 2.

[0019] See Figure 3 , Figure 4 , Figure 5 , Figure 6The welding fixture for assembling the front and rear frames of the lithium battery-powered children's bicycle described in this utility model includes an upper fork assembly positioning and clamping device 4 comprising a first mounting base 4-1, a first vertical position adjustment base 4-2, an upper fork tube bracket 4-3, an upper fork tube limiting block 4-4, an upper fork tube pressure plate 4-5, and a first downward pressing clamp 4-6. The first mounting base 4-1 is fitted with a base 2. The bottom of the first mounting base 4-1 is provided with a slider that cooperates with the slide rail 2-1 on the base 2 and an elongated hole that cooperates with the mounting hole 2-2 on the base 2, thus enabling the first mounting base 4-1 to move horizontally along the left and right directions of the base. The first vertical position adjustment base 4-2 is fitted on the upper part of the first mounting base 4-1. The upper fork tube bracket 4-3 is assembled with the first vertical position adjustment base 4-2 through a first pin 4-7 and a locking bolt assembly 4-8, which can be connected by... The upper fork tube bracket 4-3 is adjusted vertically via the first vertical position adjustment seat 4-2, and its angle is adjusted by rotating it around the first pin 4-7 to match the clamping posture and position of the inclined upper fork assembly 1-2. Two sets of upper fork tube limiting blocks 4-4 and a first downward pressing clamping pliers 4-6 are also provided on the upper fork tube bracket 4-3. The two sets of upper fork tube limiting blocks 4-4 limit the front and rear positions of the two upper fork tubes 1-2-1 in the upper fork assembly 1-2. An upper fork tube pressure plate 4-5 is installed at the lower end of the pressure head of the first downward pressing clamping pliers 4-6. The upper fork tube pressure plate 4-5 and the upper fork tube limiting blocks 4-4 are arranged vertically opposite each other, and the upper fork assembly 1-2 can be positioned and pressed by the cooperation of the upper fork tube pressure plate 4-5 and the upper fork tube limiting blocks 4-4.

[0020] See Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9The welding fixture for assembling the front and rear frames of the lithium battery-powered children's stroller described in this utility model includes a lower fork tube positioning and clamping device 5 comprising a second mounting base 5-1, a first angle adjustment base 5-3, a first angle adjustment base locking sleeve 5-2, a second angle adjustment base 5-4, a lower fork tube bracket 5-6, a lower fork tube limiting post 5-7, a lower fork tube pressure plate 5-8, and a pressure plate locking screw 5-9. The second mounting base 5-1 is fitted with the base 2. The bottom of the second mounting base 5-1 is provided with a slider that cooperates with the slide rail 2-1 on the base 2 and an elongated hole that cooperates with the mounting hole 2-2 on the base 2. Therefore, the second mounting base 5-1 can move horizontally along the left and right directions of the base. The first angle adjustment base 5-3 is fitted at the center position of the second mounting base 5-1. The first angle adjusting seat 5-3 is rotatable around a vertical axis and is locked in place by the first angle adjusting seat locking sleeve 5-2. The first angle adjusting seat locking sleeve 5-2 is an open sleeve with a locking pin at the opening. The second angle adjusting seat 5-4 is hinged to the first angle adjusting seat 5-3 via a second pin 5-5. The second angle adjusting seat 5-4 is rotatable around the horizontally arranged second pin 5-5 and is locked in place by a locking pin. The second angle adjusting seat 5-4 consists of upper and lower parts arranged opposite to each other. A second pin through hole is provided at the joint surface of the upper and lower parts. A lower fork tube bracket 5-6 is installed on the upper end of the second angle adjusting seat 5-4. The two sets of lower fork tubes 1-3-1 workpieces are connected by the lower fork tube bracket. Positioning 5-6: Since the lower fork assembly 1-3 is arranged at an angle, when adjusting the left and right positions of the lower fork tube bracket 5-6, the adjustment of its height and spatial posture must also be considered. This invention allows the first angle adjustment seat 5-3 to rotate around the vertical axis, making the two sets of lower fork tubes 1-3-1 placed on the lower fork tube bracket 5-6 symmetrical front and back. The second angle adjustment seat 5-4 rotates around the horizontally arranged second pin 5-5, matching the tilt angle of the lower fork tube bracket 5-6 with the tilt angle of the lower fork assembly 1-3 after welding the frame assembly. This achieves corresponding adjustments to the workpiece height and spatial posture when adjusting the left and right positions of the lower fork tube positioning and clamping device 5. The lower fork tube bracket 5-6... The central part has a boss structure, and the two sides of the boss have sliding grooves 5-6-1. The bottom surface of the sliding groove 5-6-1 is provided with a lower fork tube limiting post assembly hole 5-6-2. The lower fork tube limiting post assembly hole 5-6-2 is an elongated hole extending along the central axis of the sliding groove. The lower fork tube limiting posts 5-7 are symmetrically arranged on the left and right, with two sets on each side. The lower fork tube 1-3-1 passes through the two sets of lower fork tube limiting posts 5-7. Each set of lower fork tube limiting posts 5-7 is a cylindrical structure. The top of the cylinder is provided with a guide conical surface. The lower end of the cylinder is placed in the sliding groove 5-6-1 of the lower fork tube bracket 5-6. The lower fork tube limiting posts 5-7 are assembled with the lower fork tube bracket 5-6 by screws passing through the elongated holes on the bottom surface of the lower fork tube bracket sliding groove.The lower fork tube pressure plate 5-8 is placed on the boss structure of the lower fork tube bracket 5-6 and is fixedly assembled with the lower fork tube bracket 5-6 by pressure plate locking screws 5-9. The lower fork tube pressure plate 5-8 is provided with lower fork tube limiting post clearance holes 5-8-1 matching the number of lower fork tube limiting posts 5-7. When the lower fork tube pressure plate 5-8 is fixedly assembled with the lower fork tube bracket 5-6, the upper end of the lower fork tube limiting post 5-7 can protrude through the lower fork tube limiting post clearance holes 5-8-1.

[0021] See Figure 3 , Figure 4 , Figure 10 , Figure 11 , Figure 12 The welding fixture for assembling the front and rear frames of the lithium battery stroller described in this utility model includes an ear-plate positioning and clamping device 6 comprising a third mounting base 6-1, a second vertical position adjustment base 6-2, a third angle adjustment base 6-3, an ear-plate positioning base 6-5, and a side-push type clamp 6-6. The third mounting base 6-1 is fitted with the base 2. The bottom of the third mounting base 6-1 is provided with a slider that cooperates with the slide rail 2-1 on the base 2 and an elongated hole that cooperates with the mounting hole 2-2 on the base 2. Therefore, the third mounting base 6-1 can be aligned along the slide rail 2-1 on the base 2. The base 2 moves horizontally left and right, and a second vertical position adjustment seat 6-2 is assembled on the upper part of the third mounting seat 6-1. The third angle adjustment seat 6-3 consists of two parts, which are arranged opposite to each other and connected as one piece by locking pins. A third pin through hole is provided at the joint surface of the two parts. The third angle adjustment seat 6-3 is assembled with the second vertical position adjustment seat 6-2 by a horizontally arranged third pin 6-4. The third angle adjustment seat 6-3 can rotate around the horizontally arranged third pin 6-4 and is connected by locking pins. For locking and fixing, an ear plate positioning seat 6-5 and a side-push caliper 6-6 are installed on the third angle adjustment seat 6-3. The spatial angle of the ear plate positioning seat 6-5 can be adjusted through the third angle adjustment seat 6-3 to adapt to the spatial posture of the ear plate 1-3-2, which is welded to the lower fork tube 1-3-1. Two sets of ear plate positioning seats 6-5 and side-push calipers 6-6 are symmetrically arranged. Each set of ear plate positioning seats 6-5 is provided with an ear plate slot 6-5-1 and a side-push caliper plug through hole 6-5-1. 2 and ear plate positioning holes 6-5-3, two sets of side-push calipers 6-6 are arranged on the outside of the two sets of ear plate positioning seats 6-5. The plug of the side-push caliper 6-6 is a stepped shaft positioning pin 6-6-1. The stepped shaft positioning pin 6-6-1 passes through the side-push caliper plug through hole 6-5-2, ear plate slot 6-5-1 and slot positioning hole 6-5-3, and cooperates with the notch 1-3-2-1 provided on the ear plate 1-3-2 to position and lock the ear plate 1-3-2 placed in the ear plate slot 6-5-1.

[0022] See Figures 1 to 12When using this utility model to assemble and weld the front and rear frames of a lithium battery-powered children's bicycle, firstly, standard samples of the front frame 1-1, upper fork assembly 1-2, and lower fork assembly 1-3 are used as reference parts. The positions and spatial orientations of each component in the front frame positioning and clamping device 3 are adjusted (this adjustment process is carried out according to the front frame welding tooling operation procedure). At this time, the components of the front frame 1-1 have been welded together. Therefore, the front upright tube 1-1-1 and seat tube 1-1-4 of the front frame 1-1 can be positioned and clamped respectively by the two sets of front frame upright tube positioning and clamping units 3-1 in the front frame positioning and clamping device 3. Then, the battery mounting seat assembly 1-1-5 in the front frame 1-1 is positioned by the battery mounting seat assembly positioning unit. The positioning and clamping of the standard sample 1-1 of the front frame is achieved. Then, by adjusting the position and spatial posture of each component in the upper fork assembly positioning and clamping device 4, the lower fork tube positioning and clamping device 5, and the lug positioning and clamping device 6, the standard samples of the upper fork assembly 1-2 and the lower fork assembly 1-3 are positioned and clamped respectively. The relative position of each standard sample and the overall size of the frame assembly 1 are measured to see if they meet the relevant requirements. If they do not meet the requirements, the position and spatial posture of each component of the workpiece and tooling are finely adjusted until they meet the requirements, and the tooling debugging work for this batch of workpieces is completed. The standard samples are removed, and the workpiece to be welded is clamped according to the above operation steps to carry out the assembly welding operation of the front frame and rear frame of the lithium battery children's bicycle.

Claims

1. A welding fixture for assembling the front and rear frames of a lithium battery-powered children's stroller, characterized in that: The system includes a base (2), a front frame positioning clamping device (3), an upper fork assembly positioning clamping device (4), a lower fork tube positioning clamping device (5), and a lug positioning clamping device (6). The base (2) is horizontally arranged, and the front frame positioning clamping device (3), upper fork assembly positioning clamping device (4), lower fork tube positioning clamping device (5), and lug positioning clamping device (6) are mounted on the base (2). The front frame positioning clamping device (3) includes components that are respectively connected to the front seat tube (1-1-1) and the seat tube (1-1-1). 1-1-4) Two front frame riser positioning and clamping units (3-1) and battery mounting bracket positioning unit (3-2) are used in conjunction; the upper fork assembly positioning and clamping device (4) and the two front frame riser positioning and clamping units (3-1) are installed on the rear edge of the base (2) and arranged in sequence along the left and right directions; the lower fork positioning and clamping device (5), the lug positioning and clamping device (6) and the battery mounting bracket positioning and clamping unit (3-2) are arranged along the central axis of the left and right directions of the base (2).

2. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 1, characterized in that: The upper fork assembly positioning and clamping device (4) includes a first mounting base (4-1), a first vertical position adjustment base (4-2), an upper fork tube bracket (4-3), an upper fork tube limiting block (4-4), an upper fork tube pressure plate (4-5), and a first downward clamping clamp (4-6); the first mounting base (4-1) is fitted with the base (2), and the first vertical position adjustment base (4-2) is fitted on the first mounting base (4-1); the upper fork tube bracket (4-3) is fitted with the base (2); the first vertical position adjustment base (4-2) is fitted on the first mounting base (4-3); the upper fork tube bracket (4-3) is fitted with the base (2); the first vertical position adjustment base (4-4) is fitted with the base (2); the first vertical position adjustment base (4-5) is fitted with the base (2); the first vertical position adjustment base (4-6) is fitted with the base (2); the first vertical position adjustment base (4-4) is fitted with the base (2); the first vertical position adjustment base (4-5 ...4) is fitted with the base (2); the first vertical position adjustment base (4-5) is fitted with the base (2); the first vertical position adjustment base (4-4) is fitted with the base (2); the first vertical position adjustment 3) The first pin (4-7) and locking bolt assembly (4-8) are used to assemble with the first upper and lower position adjustment seat (4-2). Two sets of upper fork tube limiting blocks (4-4) and a first downward pressing clamp (4-6) are set on the upper fork tube bracket (4-3). The upper fork tube pressure plate (4-5) is installed at the lower end of the pressure head of the first downward pressing clamp (4-6). The upper fork tube pressure plate (4-5) and the upper fork tube limiting blocks (4-4) are arranged vertically opposite each other.

3. The welding fixture for assembling the front and rear frames of a lithium battery-powered stroller according to claim 1 or 2, characterized in that: The lower fork tube positioning and clamping device (5) includes a second mounting base (5-1), a first angle adjusting base (5-3), a first angle adjusting base locking sleeve (5-2), a second angle adjusting base (5-4), a lower fork tube bracket (5-6), a lower fork tube limiting post (5-7), a lower fork tube pressure plate (5-8), and a pressure plate locking screw (5-9); the second mounting base (5-1) is fitted with the base (2), and the first angle adjusting base (5-3) is fitted at the center of the second mounting base (5-1); the first angle adjusting base (5-3) can rotate around the vertical axis and is locked and fixed by the first angle adjusting base locking sleeve (5-2); the first angle adjusting base locking sleeve (5-2) is an open sleeve with a locking pin at the opening; the second angle adjusting base (5-4) is connected to the first angle adjusting base (5-5) by a second pin (5-5). Angle adjustment seat (5-3) is hinged and assembled. Second angle adjustment seat (5-4) can rotate around the horizontally arranged second pin (5-5) and is locked and fixed by a locking pin. Lower fork tube bracket (5-6) is installed on the upper end of the second angle adjustment seat (5-4). The lower fork tube bracket (5-6) has a boss structure in the middle and sliding grooves (5-6-1) on both sides of the boss. The lower fork tube limiting post (5-7) is symmetrically arranged on the left and right, with two sets on the left and two on the right. Its lower end is placed in the sliding groove (5-6-1) of the lower fork tube bracket (5-6). The lower fork tube pressure plate (5-8) is placed on the boss structure of the lower fork tube bracket (5-6) and is fixedly assembled with the lower fork tube bracket (5-6) by pressure plate locking screw (5-9). Lower fork tube limiting post clearance hole (5-8-1) is provided on the lower fork tube pressure plate (5-8).

4. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 3, characterized in that: The second angle adjustment seat (5-4) consists of two parts, upper and lower, which are arranged opposite to each other and connected as one unit by a locking pin. A second pin through hole is provided at the joint surface of the upper and lower parts.

5. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 4, characterized in that: The bottom surface of the groove (5-6-1) of the lower fork tube bracket (5-6) is provided with a lower fork tube limiting post assembly hole (5-6-2), which is an elongated hole extending along the central axis of the groove; the lower fork tube limiting post (5-7) is a cylindrical structure with a guide conical surface at the top of the cylinder, and the lower fork tube limiting post (5-7) is assembled with the lower fork tube bracket (5-6) by a screw passing through the elongated hole at the bottom surface of the groove of the lower fork tube bracket.

6. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 3, characterized in that: The ear-plate positioning and clamping device (6) includes a third mounting base (6-1), a second vertical position adjustment base (6-2), a third angle adjustment base (6-3), an ear-plate positioning base (6-5), and a side-push clamp (6-6); the third mounting base (6-1) is fitted with the base (2), and the second vertical position adjustment base (6-2) is mounted on the upper part of the third mounting base (6-1); the third angle adjustment base (6-3) is assembled with the second vertical position adjustment base (6-2) through a horizontally arranged third pin (6-4), the third angle adjustment base (6-3) can rotate around the horizontally arranged third pin (6-4), and is locked and fixed by a locking pin, and the ear-plate positioning base (6-5) and the side-push clamp (6-6) are installed on the third angle adjustment base (6-3); the ear-plate positioning base (6-1) Two sets of 6-5 and side-push calipers (6-6) are symmetrically arranged. Each set of ear plate positioning seats (6-5) is provided with an ear plate slot (6-5-1), a side-push caliper plug through hole (6-5-2), and an ear plate positioning hole (6-5-3). The two sets of side-push calipers (6-6) are arranged on the outside of the two sets of ear plate positioning seats (6-5). The plug of the side-push caliper (6-6) is a stepped shaft positioning pin (6-6-1). The stepped shaft positioning pin (6-6-1) passes through the side-push caliper plug through hole (6-5-2), the ear plate slot (6-5-1), and the slot positioning hole (6-5-3), and cooperates with the notch (1-3-2-1) provided on the ear plate (1-3-2) to position and lock the ear plate (1-3-2) placed in the ear plate slot (6-5-1).

7. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 6, characterized in that: The third angle adjustment seat (6-3) consists of two parts, which are arranged opposite to each other and connected as one unit by a locking pin. A third pin through hole is provided at the joint surface of the two parts.

8. The welding fixture for assembling the front and rear frames of the lithium battery stroller according to claim 6, characterized in that: The base (2) is provided with a slide rail (2-1) that runs through the left and right sides, and also with a number of mounting holes (2-2) that cooperate with the front frame positioning clamping device (3), the upper fork assembly positioning clamping device (4), the lower fork tube positioning clamping device (5) and the lug positioning clamping device (6), respectively; correspondingly, the bottom of the front frame positioning clamping device (3), the upper fork assembly positioning clamping device (4), the lower fork tube positioning clamping device (5) and the lug positioning clamping device (6) is provided with a slider that cooperates with the slide rail (2-1) on the base (2), and also with an elongated hole that can adjust the left and right position and cooperates with the mounting hole (2-2) on the base (2).

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