Integrated lithium battery stroller rear frame welding tooling

Abstract

A welding fixture for the rear frame of an integrated lithium battery-powered children's bicycle includes a fixed base, a base plate support, a base plate, an upper fork assembly positioning and clamping device, and a lower fork assembly positioning and clamping device. The fixed base is installed on a horizontal surface, and the base plate support is mounted on the fixed base. The base plate is fixed to the base plate support, and the upper fork assembly positioning and clamping devices and the lower fork assembly positioning and clamping devices are respectively arranged on the left and right sides of the central axis of the base plate. The upper fork assembly positioning and clamping device consists of a first positioning and clamping unit for the upper fork tube, a second positioning and clamping unit for the upper fork tube, and an upper fork tube positioning and support unit, arranged sequentially from top to bottom. The lower fork assembly positioning and clamping device includes a lower fork tube positioning and clamping unit and an ear piece positioning and clamping unit, with the lower fork tube positioning and clamping unit positioned above the ear piece positioning and clamping unit. This utility model meets the requirements for integrated management of the production process and ensures the consistency of the overall production rhythm.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a welding fixture for the rear frame of an integrated lithium battery stroller. Background Technology

[0002] As attached Figure 1 As shown, a children's bicycle frame 1 equipped with a lithium battery consists of a front frame 1-1 and a rear frame. The rear frame includes two sets of upper fork tubes 1-2, lower fork tubes 1-3, and lugs 1-4. The two sets of lugs 1-4 are welded to the two sets of lower fork tubes 1-3 to form a lower fork tube assembly. Grooves 1-4-1 for mate with the rear wheel axle of the children's bicycle are respectively provided on the two sets of lugs 1-4. A short cross tube 1-5 is welded between the two sets of upper fork tubes 1-2, and the two sets of upper fork tubes 1-2 are connected through the short cross tube 1-5 to form an upper fork assembly. When welding this children's bicycle frame 1, the welding of the front frame 1 and the upper fork assembly and lower fork tube assembly in the rear frame must be completed first. Then, the front frame 1 and the rear frame are welded together to form the frame assembly.

[0003] Lithium battery-powered children's bicycles are a new product developed by children's bicycle manufacturers. Due to the lack of a market environment for mass production, a modular production management model is adopted for their frame assembly. This means that in each children's bicycle's frame assembly 1, a set of front frame 1-1, a set of upper fork assemblies, and two sets of lower fork tube assemblies are combined to form a complete set of frame assembly components. To meet the above production process management requirements and promptly remove defective parts from the frame assembly and weld qualified parts, the preferred solution is to complete the welding of the upper fork assembly and lower fork tube assembly of the rear frame in the same workstation. This ensures that the front frame 1-1 and rear frame components correspond one-to-one during frame assembly welding, guaranteeing the consistency of the overall production cycle. Utility Model Content

[0004] This utility model provides an integrated lithium battery children's bicycle rear frame welding fixture, which aims to integrate the workpiece positioning and clamping mechanism for welding the upper fork assembly and the lower fork tube assembly on the same base plate, so that the welding of the upper fork assembly and the lower fork assembly of the rear frame can be completed at the same station, thereby meeting the requirements of integrated management of the production process and ensuring the consistency of the overall production rhythm.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A welding fixture for the rear frame of an integrated lithium battery-powered children's bicycle includes a fixed base, a base plate support, a base plate, an upper fork assembly positioning and clamping device, and a lower fork assembly positioning and clamping device. The fixed base is installed on a horizontal surface, and the base plate support is mounted on the fixed base. The base plate is fixed to the base plate support, and the upper fork assembly positioning and clamping device and the lower fork assembly positioning and clamping device are respectively arranged on the left and right sides of the central axis of the base plate. The upper fork assembly positioning and clamping device includes a first positioning and clamping unit for the upper fork tube, a second positioning and clamping unit for the upper fork tube, and a positioning and support unit for the upper fork tube, arranged sequentially from top to bottom. The lower fork assembly positioning and clamping device includes a lower fork tube positioning and clamping unit and a lug positioning and clamping unit, with the lower fork tube positioning and clamping unit positioned above the lug positioning and clamping unit.

[0006] The aforementioned integrated lithium battery-powered children's bicycle rear frame welding fixture has a base plate that is an inclined flat plate. The base plate is provided with welding clearance holes for the upper fork tube and the short cross tube, and welding clearance holes for the lower fork tube and the lug. The welding clearance holes for the upper fork tube and the short cross tube are arranged on one side of the upper fork assembly positioning and clamping device. The welding clearance holes for the lower fork tube and the lug are arranged on one side of the lower fork assembly positioning and clamping device.

[0007] The aforementioned integrated lithium battery stroller rear frame welding fixture includes a first positioning and clamping unit for the upper fork tube located above the welding clearance hole between the upper fork tube and the short cross tube. This unit comprises a push-down clamping clamp, a V-shaped positioning block, a first pressing clamp, and a strip-shaped clamping block. One end of the pressing head of the push-down clamping clamp is fitted with a V-shaped positioning block. The first pressing clamp is positioned inside the push-down clamping clamp, and a strip-shaped clamping block is installed on the pressing head of the first pressing clamp. Both ends of the strip-shaped clamping block are inclined surfaces that match the V-shaped positioning block.

[0008] The aforementioned integrated lithium battery-powered children's bicycle rear frame welding fixture includes a second positioning and clamping unit for the upper fork tube, installed below the welding clearance hole between the upper fork tube and the short cross tube. This unit comprises a short cross tube positioning block, a short cross tube positioning block support, a second downward-pressing clamping pliers, and a T-shaped clamping block. The short cross tube positioning block support is an L-shaped support, assembled with the base plate via its vertical arm, which extends to the center of the welding clearance hole between the upper fork tube and the short cross tube. The short cross tube positioning block is fitted with the horizontal arm of the short cross tube positioning block support, and a short cross tube positioning groove matching the outer surface of the short cross tube is provided on the short cross tube positioning block. The pressure head of the second downward-pressing clamping pliers is assembled with the T-shaped clamping block. The horizontal arm of the T-shaped clamping block clamps the left and right upper fork tubes in the upper fork assembly, and the vertical arm of the T-shaped clamping block clamps the short cross tube in the upper fork assembly.

[0009] The aforementioned integrated lithium battery-powered children's bicycle rear frame welding fixture includes an upper fork tube positioning support unit comprising an upper fork tube positioning block, an upper fork tube positioning block support seat, an upper fork tube top block, and a set screw. Two sets of upper fork tube positioning blocks are symmetrically arranged on the left and right sides and mounted on the upper fork tube positioning block support seat. Each upper fork tube positioning block has a U-shaped positioning groove at its front end and a rearward-extending bottom surface. The upper fork tube positioning block support seat is fitted with a base plate. The upper fork tube top block is a tilted T-shaped block structure arranged on the rearward-extending surface of the upper fork tube positioning block, with its vertical arm extending into the U-shaped positioning groove of the upper fork tube positioning block. The set screw is fitted with the U-shaped positioning groove of the upper fork tube positioning block.

[0010] The aforementioned integrated lithium battery stroller rear frame welding fixture includes a lower fork tube positioning and clamping unit positioned above the welding clearance hole between the lower fork tube and the lug. This unit comprises a lower fork tube positioning seat, a lower fork tube positioning seat support frame, a lower fork tube limiting block, a lower fork tube positioning block, a third downward-pressing clamping clamp, and a lower fork tube clamping block. The lower fork tube positioning seat has a symmetrical structure, with two sets of lower fork tube limiting blocks mounted on both its left and right sides. The front end of the lower fork tube workpiece passes through the gap between the two sets of lower fork tube limiting blocks. A lower fork tube positioning seat is positioned in the middle. It has a boss that matches the support frame of the lower fork tube positioning seat; the support frame of the lower fork tube positioning seat is an L-shaped support frame, whose vertical arm is assembled with the base plate and whose horizontal arm is assembled with the lower fork tube positioning seat; two sets of lower fork tube positioning blocks are symmetrically arranged on the left and right and installed on the base plate, and the lower fork tube positioning blocks are provided with arc-shaped grooves that match the outer surface of the lower fork tube workpiece; the third pressing clamp is arranged inside the lower fork tube positioning block, and a lower fork tube clamping block is assembled on its pressing head, and the lower fork tube clamping block is a straight clamping block.

[0011] The aforementioned integrated lithium battery-powered stroller rear frame welding fixture includes an ear piece positioning and clamping unit located below the welding clearance hole between the lower fork tube and the ear piece. This unit comprises an ear piece positioning seat, a fourth downward-pressing clamping clamp, and an ear piece clamping block. The ear piece positioning seats are mounted on the base plate in two symmetrically arranged sets. Each set of ear piece positioning seats has an ear piece positioning insert that matches a notch on the ear piece workpiece. The fourth downward-pressing clamp is mounted on the base plate below the ear piece positioning seat, and an ear piece clamping block is mounted on its clamping head. The ear piece clamping block is a straight clamping block.

[0012] The aforementioned integrated lithium battery stroller rear frame welding fixture has a V-shaped positioning block guide groove on the base plate; a slide rail is provided on the bottom surface of the V-shaped positioning block of the first positioning and pressing unit of the upper fork tube; the V-shaped positioning block guide groove cooperates with the slide rail to provide guidance for the vertical movement of the V-shaped positioning block.

[0013] This utility model provides an integrated welding fixture for the rear frame of a lithium battery-powered children's bicycle. It integrates the upper fork assembly positioning and clamping device and the lower fork assembly positioning and clamping device on the same base plate. This allows for the completion of welding operations for both the upper and lower fork assemblies in a single welding station. Therefore, if a component in either the upper or lower fork assembly is found to be defective, it can be promptly removed and repaired, ensuring the quantity and quality of components in each frame assembly are met. Furthermore, the base plate is mounted on a fixed base via a base plate support. For areas requiring full welding, welding can be performed on both sides through welding clearance holes on the base plate. Since a separate welding positioner is unnecessary, this not only reduces production costs but also facilitates the rational arrangement of equipment on-site. It also avoids weld cracking caused by the workpiece rotating with the positioner before solidification. The inclined arrangement of the base plate improves the stability of workpiece clamping and reduces the risk of workpiece falling during clamping. In summary, this utility model achieves the goal of meeting the requirements for integrated management of the production process and ensuring consistent overall production rhythm. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the frame assembly structure of a lithium battery stroller; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is an enlarged view of the base plate support, base plate, upper fork assembly positioning and clamping device, and lower fork assembly positioning and clamping device; Figure 4 This is a schematic diagram of the base plate structure; Figure 5 This is a schematic diagram of the structure of the first positioning and clamping unit of the upper fork tube in the positioning and clamping device of the upper fork assembly; Figure 6 yes Figure 5 K-direction view; Figure 7 This is a schematic diagram of the second positioning and clamping unit of the upper fork tube in the positioning and clamping device of the upper fork assembly; Figure 8 This is a schematic diagram of the upper fork tube positioning support unit structure in the upper fork assembly positioning and clamping device; Figure 9 yes Figure 8 Top view (after rotation); Figure 10 This is a schematic diagram of the lower fork tube positioning and clamping unit structure in the lower fork assembly positioning and clamping device; Figure 11 This is a schematic diagram of the ear plate positioning and pressing unit structure in the lower fork assembly positioning and clamping device; Figure 12 This is a plan view (rear view) of the positioning and clamping device for the lower fork assembly.

[0015] Explanation of each label in the diagram: 1 is the frame, 1-1 is the front frame, 1-2 is the top fork tube, 1-3 is the bottom fork tube, 1-4 is the lug, 1-4-1 is the notch, and 1-5 is the short cross tube. 2 is a fixed base; 3 is the base plate support seat; 4 is the base plate; 4-1 is the welding clearance hole between the upper fork tube and the end crossbeam; 4-2 is the welding clearance hole between the lower fork tube and the lug; 4-3 is the V-shaped positioning block guide groove; 4-4 is the long hole for adjusting the up and down position of the short cross tube positioning block support; 4-5 is the long hole for adjusting the up and down position of the upper fork tube positioning block support; 4-6 is the long hole for adjusting the up and down position of the lower fork tube positioning block support; 4-7 is the long hole for adjusting the left and right position of the lower fork tube positioning block; 4-8 is the long hole for adjusting the position of the lug positioning seat. 5 is the positioning and clamping device for the upper fork assembly. 5-1 is the first positioning and clamping unit of the upper fork tube. 5-1-1 is a push-down clamping clamp, 5-1-2 is a V-shaped positioning block, 5-1-2-1 is a slide rail, 5-1-3 is the first push-down clamping clamp, and 5-1-4 is a strip-shaped clamping block. 5-2 is the second positioning and clamping unit of the upper fork tube. 5-2-1 is the short horizontal tube positioning block, 5-2-1-1 is the short horizontal tube positioning groove, 5-2-2 is the short horizontal tube positioning block support, 5-2-3 is the second downward pressing clamping clamp, and 5-2-4 is the T-shaped clamping head. 5-3 is the upper fork tube positioning support unit. 5-3-1 is the upper fork tube positioning block support seat, 5-3-2 is the upper fork tube positioning block, 5-3-3 is the upper fork tube top block, and 5-3-4 is the set screw; 6 is the positioning and clamping device for the lower fork assembly. 6-1 is the lower fork tube positioning and clamping unit. 6-1-1 is the lower fork tube positioning seat support frame, 6-1-2 is the lower fork tube positioning seat, 6-1-3 is the lower fork tube limiting block, 6-1-4 is the lower fork tube positioning block, 6-1-4-1 is an arc-shaped groove, 6-1-5 is the third downward pressing clamping clamp, and 6-1-6 is the lower fork tube clamping block. 6-2 is the earpiece positioning and clamping unit. 6-2-1 is the ear plate positioning seat, 6-2-1-1 is the ear plate positioning insert, 6-2-2 is the fourth pressing clamping pliers, and 6-2-3 is the ear plate clamping block. Detailed Implementation

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

[0017] Referring to Figure 1, a frame 1 for a children's bicycle equipped with a lithium battery consists of a front frame 1-1 and a rear frame. The rear frame includes two sets of upper fork tubes 1-2, lower fork tubes 1-3, and lugs 1-4. The two sets of lugs 1-4 are welded to the two sets of lower fork tubes 1-3 to form a lower fork tube assembly. Grooves 1-4-1 for mating with the rear wheel axle of the children's bicycle are respectively provided on the two sets of lugs 1-4. A short cross tube 1-5 is welded between the two sets of upper fork tubes 1-2, forming the upper fork assembly. When welding the frame 1, the welding of the front frame 1 and the upper fork assembly and lower fork tube assembly in the rear frame must be completed first. Then, the front frame 1 and the rear frame are welded together to complete the overall frame assembly. Lithium battery-powered children's vehicles are a new product developed by children's vehicle manufacturers. Due to the lack of a market environment for mass production, a modular production management model is adopted for their frame assembly. That is, the frame 1 of each children's vehicle is composed of frame 1-1, a set of upper fork assemblies and two sets of lower fork tube assemblies, forming a set of frame assembly components.

[0018] See Figure 2 , Figure 3 To meet the requirements of standardized management in the production process of lithium battery-powered children's vehicles and ensure the consistency of the overall production rhythm, this utility model provides an integrated welding fixture for the rear frame of lithium battery-powered children's vehicles. It includes a fixed base 2, a base plate support 3, a base plate 4, an upper fork assembly positioning and clamping device 5, and a lower fork assembly positioning and clamping device 6. The fixed base 2 is installed on a horizontal surface, and the base plate support 3 is mounted on the fixed base 2. To adapt to different site layouts at the welding station, the base plate support 3 can be adjusted left and right on the fixed base 2. The base plate 4 is fixed to the base plate support 3, and the upper forks are arranged on the left and right sides of the central axis of the base plate. The upper fork assembly positioning and clamping device 5 and the lower fork assembly positioning and clamping device 6 are provided. The upper fork assembly positioning and clamping device 5 is provided with an upper fork tube first positioning and clamping unit 5-1, an upper fork tube second positioning and clamping unit 5-2 and an upper fork tube positioning and support unit 5-3, which are arranged from top to bottom. The lower fork assembly positioning and clamping device 6 is provided with a lower fork tube positioning and clamping unit 6-1 and an ear piece positioning and clamping unit 6-2, with the lower fork tube positioning and clamping unit 6-1 arranged above the ear piece positioning and clamping unit 6-2.

[0019] See 3. Figure 4 The integrated lithium battery stroller rear frame welding fixture of this utility model has a base plate 4 that is an inclined flat plate. The base plate 4 is provided with welding clearance holes 4-1 between the upper fork tube and the short cross tube, and welding clearance holes 4-2 between the lower fork tube and the lug. The welding clearance holes 4-1 between the upper fork tube and the short cross tube are arranged on one side of the upper fork assembly positioning and clamping device 5. The welding clearance holes 4-2 between the lower fork tube and the lug are arranged on one side of the lower fork assembly positioning and clamping device 6.

[0020] See Figure 3 , Figure 5 , Figure 6 The integrated lithium battery stroller rear frame welding fixture of this utility model has an upper fork assembly positioning clamping device 5 with the upper fork tube first positioning and clamping unit 5-1 located above the welding clearance hole 4-1 between the upper fork tube and the short cross tube on the base plate 4. It is equipped with a push-type clamping clamp 5-1-1, a V-shaped positioning block 5-1-2, a first press-type clamping clamp 5-1-3, and a strip-shaped clamping block 5-1-4. The V-shaped positioning block 5-1-2 is installed at one end of the pressure head of the push-type clamping clamp 5-1-1. The first press-type clamping clamp 5-1-3 is arranged inside the push-type clamping clamp 5-1-1. The strip-shaped clamping block 5-1-4 is installed on the pressure head of the first press-type clamping clamp 5-1-3. The two ends of the strip-shaped clamping block 5-1-4 are inclined surfaces that match the V-shaped positioning block.

[0021] See Figure 3 , Figure 7 The integrated lithium battery-powered children's stroller rear frame welding fixture of this utility model has an upper fork assembly positioning and clamping device 5, in which the upper fork tube second positioning and clamping unit 5-2 is installed below the welding clearance hole 4-1 between the upper fork tube and the short cross tube on the base plate 4. It includes a short cross tube positioning block 5-2-1, a short cross tube positioning block support 5-2-2, a second downward-pressing clamping clamp 5-2-3, and a T-shaped clamping block 5-2-4. The short cross tube positioning block support 5-2-2 is an L-shaped support, assembled with the base plate 4 via its vertical arm. The vertical arm of the L-shaped support extends to the middle of the welding clearance hole 4-1 between the upper fork tube and the short cross tube on the base plate 4. The short cross tube positioning block 5-2-1 and the short cross tube positioning block support 5-2-2... The horizontal arm of the L-shaped support is fitted with a short horizontal tube positioning groove 5-2-1-1 that matches the outer surface of the short horizontal tube on the short horizontal tube positioning block 5-2-1; the pressure head of the second pressing clamp 5-2-3 is assembled with the T-shaped clamping block 5-2-4, and the horizontal arm of the T-shaped clamping block 5-2-4 is used to press and position the left and right upper fork tubes 1-2 in the upper fork assembly, and the vertical arm of the T-shaped clamping block is used to press and position the short horizontal tube 1-5 in the upper fork assembly.

[0022] See Figure 3 , Figure 8 , Figure 9The integrated lithium battery-powered children's bicycle rear frame welding fixture of this utility model includes an upper fork tube positioning support unit 5-3 of the upper fork assembly positioning clamping device 5, comprising an upper fork tube positioning block 5-3-2, an upper fork tube positioning block support seat 5-3-1, an upper fork tube top block 5-3-3, and a set screw 5-3-4. Two sets of upper fork tube positioning blocks 5-3-2 are symmetrically arranged on the left and right sides and installed on the upper fork tube positioning block support seat 5-3-1. A U-shaped positioning groove is provided at the front end of each block, and the bottom surface is a rearward extending surface. The upper fork tube positioning block support seat 5-3-1 is fitted with the base plate 4. The upper fork tube top block 5-3-3 is a tilted T-shaped block structure, arranged on the rearward extending surface of the upper fork tube positioning block 5-3-2, with its vertical arm extending into the U-shaped positioning groove of the upper fork tube positioning block 5-3-2. The set screw 5-3-4 is fitted with the U-shaped positioning groove of the upper fork tube positioning block 5-3-2.

[0023] See Figure 3 , Figure 10 , Figure 12 The integrated lithium battery stroller rear frame welding fixture of this utility model has a lower fork tube positioning and clamping unit 6-1 arranged above the lower fork tube and lug welding clearance hole 4-2 on the base plate 4. It includes a lower fork tube positioning seat 6-1-2, a lower fork tube positioning seat support frame 6-1-1, a lower fork tube limiting block 6-1-3, a lower fork tube positioning block 6-1-4, a third downward-pressing clamping clamp 6-1-5, and a lower fork tube clamping block 6-1-6. The lower fork tube positioning seat 6-1-2 has a symmetrical structure, with two sets of lower fork tube limiting blocks 6-1-3 mounted on both its left and right sides. The front end of the lower fork tube 1-3 passes through the gap between the two sets of lower fork tube limiting blocks 6-1-3. -2 The middle part is provided with a boss that matches the lower fork tube positioning seat support frame 6-1-1; the lower fork tube positioning seat support frame 6-1-1 is an L-shaped support frame, the vertical arm of the L-shaped support frame is assembled with the base plate 4, and the horizontal arm of the L-shaped support frame is assembled with the lower fork tube positioning seat 6-1-2; two sets of lower fork tube positioning blocks 6-1-4 are symmetrically arranged on the left and right sides and installed on the base plate 4. The lower fork tube positioning blocks 6-1-4 are provided with arc-shaped grooves 6-1-4-1 that match the outer surface of the lower fork tube 1-3 workpiece; the third pressing clamp 6-1-5 is arranged inside the lower fork tube positioning block 6-1-4, and a lower fork tube clamping block 6-1-6 is assembled on its clamping head. The lower fork tube clamping block 6-1-6 is a straight clamping block.

[0024] See Figure 3 , Figure 11 , Figure 12The integrated lithium battery stroller rear frame welding fixture of this utility model has an ear plate positioning and clamping unit 6-2 arranged below the lower fork tube and ear plate welding clearance hole 4-2 on the base plate 4. It includes an ear plate positioning seat 6-2-1, a fourth downward pressing clamping pliers 6-2-2, and an ear plate clamping block 6-2-3. The ear plate positioning seats 6-2-1 are installed on the base plate 4 in two symmetrically arranged sets. An ear plate positioning insert 6-2-1-1 is provided on each set of ear plate positioning seats 6-2-1. The ear plate positioning insert 6-2-1-1 matches the notch 1-4-1 on the ear plate 1-4 workpiece. The fourth downward pressing clamping pliers 6-2-2 are installed on the base plate 4, located below the ear plate positioning seat 6-2-1. An ear plate clamping block 6-2-3 is installed on its pressing head. The ear plate clamping block 6-2-3 is a straight clamping block.

[0025] See Figure 3 , Figure 5 , Figure 6 The integrated lithium battery stroller rear frame welding fixture of this utility model is provided with a V-shaped positioning block guide groove 4-3 on its base plate 4; a slide rail 5-1-2-1 is provided on the bottom surface of the V-shaped positioning block 5-1-2 of the first positioning and clamping unit 5-1 of the upper fork tube; the V-shaped positioning block guide groove 4-3 cooperates with the slide rail 5-1-2-1 to provide guidance for the up and down movement of the V-shaped positioning block 5-1-2, thereby enabling the V-shaped positioning block 5-1-2 to move up and down in a straight line under the drive of the push-type clamping clamp 5-1-1, ensuring the stability of the positioning process of the upper end of the left and right upper fork tubes 1-2.

[0026] See Figures 3 to 12The integrated lithium battery-powered children's bicycle rear frame welding fixture of this utility model is provided with a short cross tube positioning block support seat vertical adjustment elongated hole 4-4, an upper fork tube positioning block support seat vertical adjustment elongated hole 4-5, a lower fork tube positioning seat support frame vertical adjustment elongated hole 4-6, a lower fork tube positioning block left and right adjustment elongated hole 4-7, and an ear plate positioning seat position adjustment elongated hole 4-8 on the base plate 4 to match different models and specifications of the frame 1. Correspondingly, the short cross tube positioning block support seat 5-2-2, the upper fork tube positioning block support seat 5-3-1, the lower fork tube positioning seat support frame 6-1-1, the lower fork tube positioning block 6-1-4, and the ear plate positioning seat 6-2-1 are respectively assembled with the base plate 4 by screw assemblies passing through the corresponding adjustment elongated holes. To accommodate adjustments to the positions of the aforementioned components, the pressure heads of the first downward-pressing clamping pliers 5-1-3, the second downward-pressing clamping pliers 5-2-3, the third downward-pressing clamping pliers 6-1-5, and the fourth downward-pressing clamping pliers 6-2-2 in this invention are all adjustable in position. Furthermore, this invention also designs the short horizontal tube positioning block 5-2-1 in the second positioning and clamping unit 5-2 of the upper fork tube as having an adjustable front-to-back position, the upper fork tube positioning block 5-3-2 in the upper fork tube positioning support unit 5-3 as having an adjustable left-to-right position, and the upper fork tube top block 5-3-3 as having an adjustable front-to-back position. This allows for adjustments to the positions of each component in the upper fork assembly, ensuring that all dimensional parameters of the upper fork assembly meet design requirements after welding. This utility model also designs the lower fork tube positioning seat 6-1-2 in the lower fork tube positioning and clamping unit 6-1 as a structure with adjustable front and rear positions, and the lower fork tube limiting block 6-1-3 as a structure with adjustable left and right positions. This allows for adjustment of the spatial posture of the lower fork tube 1-3 in the lower fork assembly, ensuring that the various dimensional parameters of the lower fork tube 1-3 meet the design requirements after welding with the lug 1-4.

[0027] See Figures 1 to 12When welding the rear frame of a lithium battery-powered children's bicycle using this invention, firstly, using a standard sample as a reference part, adjust the positions of the components in the upper fork assembly positioning clamping device 5 and the lower fork assembly positioning clamping device 6 to ensure that each positioning and clamping component perfectly fits the standard sample. Use the current positions of each component in this invention as the reference positions. Open the first pressing clamp 5-1-3, the second pressing clamp 5-2-3, the third pressing clamp 6-1-5, the fourth pressing clamp 6-2-2, and the push clamp 5-1-1 to remove the standard sample. Then, clamp two sets of upper fork tubes 1-2 and one set of short cross tubes onto the upper fork assembly positioning clamping device 5. For workpieces 1-5, two sets of lower fork tubes 1-2 and lugs 1-4 are clamped on the lower fork assembly positioning and clamping device 6. The basic dimensions of the workpieces are measured and verified. Then, welding is carried out. During the welding process, the welding gun is held by a robot welding device or manually. First, one side of the welding parts of the upper fork tube 1-2 and the short horizontal tube 1-5, and the welding parts of the lower fork tube 1-3 and the lugs 1-4 are welded. Then, the welding gun passes through the welding avoidance holes 4-1 of the upper fork tube and the short horizontal tube, and the welding avoidance holes 4-2 of the lower fork tube and the lugs 4-2 of the base plate 4 to weld the other side of the welding parts of the upper fork tube 1-2 and the short horizontal tube 1-5, and the welding parts of the lower fork tube 1-3 and the lugs 1-4, to meet the full welding requirements of the welding parts.

Claims

1. An integrated lithium battery stroller rear frame welding tool, characterized in that: The system includes a fixed base (2), a base plate support (3), a base plate (4), an upper fork assembly positioning and clamping device (5), and a lower fork assembly positioning and clamping device (6). The fixed base (2) is installed on a horizontal surface, and the base plate support (3) is mounted on the fixed base (2). The base plate (4) is fixed on the base plate support (3), and the upper fork assembly positioning and clamping device (5) and the lower fork assembly positioning and clamping device (6) are respectively arranged on the left and right sides of the central axis of the base plate. The upper fork assembly positioning and clamping device (5) is equipped with a first positioning and clamping unit for the upper fork tube. The upper fork tube is provided with a first positioning and clamping unit (5-1), a second positioning and clamping unit (5-2) for the upper fork tube, and a positioning and support unit (5-3) for the upper fork tube. The first positioning and clamping unit (5-1), the second positioning and clamping unit (5-2) for the upper fork tube, and the positioning and support unit (5-3) for the upper fork tube are arranged from top to bottom. The lower fork assembly positioning and clamping device (6) is provided with a lower fork tube positioning and clamping unit (6-1) and an ear piece positioning and clamping unit (6-2). The lower fork tube positioning and clamping unit (6-1) is arranged above the ear piece positioning and clamping unit (6-2).

2. The integrated lithium battery stroller rear frame welding tooling of claim 1, wherein: The base plate (4) is an inclined flat plate. The base plate (4) is provided with a welding clearance hole (4-1) between the upper fork tube and the short horizontal tube and a welding clearance hole (4-2) between the lower fork tube and the lug. The welding clearance hole (4-1) between the upper fork tube and the short horizontal tube is arranged on one side of the upper fork assembly positioning and clamping device (5). The welding clearance hole (4-2) between the lower fork tube and the lug is arranged on one side of the lower fork assembly positioning and clamping device (6).

3. The integrated lithium battery stroller rear frame welding tooling of claim 2, wherein: The first positioning and clamping unit (5-1) of the upper fork tube is located above the welding clearance hole (4-1) between the upper fork tube and the short horizontal tube. It is equipped with a push-type clamping pliers (5-1-1), a V-shaped positioning block (5-1-2), a first pressing clamping pliers (5-1-3), and a strip-shaped clamping block (5-1-4). The V-shaped positioning block (5-1-2) is installed at one end of the pressing head of the push-type clamping pliers (5-1-1). The first pressing clamping pliers (5-1-3) is arranged inside the push-type clamping pliers (5-1-1). The strip-shaped clamping block (5-1-4) is installed on the pressing head of the first pressing clamping pliers (5-1-3). The two ends of the strip-shaped clamping block (5-1-4) are inclined surfaces that match the V-shaped positioning blocks.

4. The integrated lithium battery stroller rear frame welding tooling of claim 3, wherein: The second positioning and clamping unit (5-2) of the upper fork tube is installed below the welding clearance hole (4-1) between the upper fork tube and the short horizontal tube, and is provided with a short horizontal tube positioning block (5-2-1), a short horizontal tube positioning block support seat (5-2-2), a second downward clamping clamp (5-2-3), and a T-shaped clamping block (5-2-4); the short horizontal tube positioning block support seat (5-2-2) is an L-shaped support seat, which is assembled with the base plate (4) through its vertical arm, and its vertical arm extends to the middle of the welding clearance hole (4-1) between the upper fork tube and the short horizontal tube; the short horizontal tube positioning block (5-2-1) 5-2-1) is fitted with the horizontal arm of the short horizontal tube positioning block support (5-2-2). The short horizontal tube positioning block (5-2-1) is provided with a short horizontal tube positioning groove (5-2-1-1) that matches the outer surface of the short horizontal tube. The pressure head of the second pressing clamp (5-2-3) is assembled with the T-shaped clamping block (5-2-4). The horizontal arm of the T-shaped clamping block (5-2-4) is used to press and position the two upper fork tubes (1-2) in the upper fork assembly. The vertical arm of the T-shaped clamping block is used to press and position the short horizontal tube (1-5) in the upper fork assembly.

5. The integrated lithium battery stroller rear frame welding tooling of claim 4, wherein: The upper fork tube positioning support unit (5-3) includes an upper fork tube positioning block (5-3-2), an upper fork tube positioning block support seat (5-3-1), an upper fork tube top block (5-3-3), and a set screw (5-3-4). The upper fork tube positioning blocks (5-3-2) are arranged symmetrically on the left and right sides and are installed on the upper fork tube positioning block support seat (5-3-1). A U-shaped positioning groove is provided at its front end, and the bottom surface is a rearward extending surface. The upper fork tube positioning block support seat (5-3-1) is fitted with the base plate (4). The upper fork tube top block (5-3-3) is a tilted T-shaped block structure, arranged on the rearward extending surface of the upper fork tube positioning block (5-3-2), and its vertical arm extends into the U-shaped positioning groove of the upper fork tube positioning block (5-3-2). The set screw (5-3-4) is fitted with the U-shaped positioning groove of the upper fork tube positioning block (5-3-2).

6. The integrated lithium battery stroller rear frame welding tooling of claim 3 or 4 or 5, wherein: The lower fork tube positioning and clamping unit (6-1) is arranged above the welding clearance hole (4-2) between the lower fork tube and the lug, and includes a lower fork tube positioning seat (6-1-2), a lower fork tube positioning seat support frame (6-1-1), a lower fork tube limiting block (6-1-3), a lower fork tube positioning block (6-1-4), a third downward clamping clamp (6-1-5), and a lower fork tube clamping block (6-1-6). The lower fork tube positioning seat (6-1-2) has a left-right symmetrical structure, with two sets of lower fork tube limiting blocks (6-1-3) installed on both its left and right sides. The front end of the lower fork tube (1-3) passes through the gap between the two sets of lower fork tube limiting blocks (6-1-3). The middle part of the lower fork tube positioning seat (6-1-2) is provided with a connection to the lower fork tube positioning seat. The support frame (6-1-1) is fitted with a boss; the lower fork tube positioning seat support frame (6-1-1) is an L-shaped support frame, its vertical arm is assembled with the base plate (4), and its horizontal arm is assembled with the lower fork tube positioning seat (6-1-2); the lower fork tube positioning blocks (6-1-4) are arranged symmetrically on the left and right sides and installed on the base plate (4). The lower fork tube positioning blocks (6-1-4) are provided with arc-shaped grooves (6-1-4-1) that match the outer surface of the lower fork tube (1-3) workpiece; the third pressing clamp (6-1-5) is arranged inside the lower fork tube positioning block (6-1-4), and a lower fork tube clamping block (6-1-6) is assembled on its clamping head. The lower fork tube clamping block (6-1-6) is a straight clamping block.

7. The integrated lithium battery stroller rear frame welding tooling of claim 6, wherein: The ear piece positioning and clamping unit (6-2) is arranged below the lower fork tube and the ear piece welding clearance hole (4-2), including an ear piece positioning seat (6-2-1), a fourth downward clamping clamp (6-2-2), and an ear piece clamping block (6-2-3); the ear piece positioning seat (6-2-1) is installed on the base plate (4), with two sets arranged symmetrically on the left and right, and an ear piece positioning insert (6-2-1-1) is provided on each set of ear piece positioning seats (6-2-1), and the ear piece positioning insert (6-2-1-1) matches the notch (1-4-1) on the ear piece (1-4) workpiece; the fourth downward clamping clamp (6-2-2) is installed on the base plate (4), located below the ear piece positioning seat (6-2-1), and an ear piece clamping block (6-2-3) is installed on its clamping head; the ear piece clamping block (6-2-3) is a straight clamping block.

8. The integrated lithium battery stroller rear frame welding tooling of claim 3, wherein: The base plate (4) is also provided with a V-shaped positioning block guide groove (4-3); a slide rail (5-1-2-1) is provided on the bottom surface of the V-shaped positioning block (5-1-2) of the first positioning and pressing unit (5-1) of the upper fork tube; the V-shaped positioning block guide groove (4-3) cooperates with the slide rail (5-1-2-1) to provide guidance for the V-shaped positioning block (5-1-2) to move up and down.

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