Child balance car vertical pipe welding perpendicularity positioning tool

Abstract

The invention relates to the field of welding fixing equipment, and provides a child balance car vertical pipe welding perpendicularity positioning tool which comprises a bottom table, a placing table installed on one side of the top of the bottom table and a clamping assembly arranged on the placing table and used for clamping a car frame, and a slotting assembly plate is arranged on the other side of the top of the bottom table; an angle adjusting assembly is arranged on the grooving assembly plate, and a lifting assembly is arranged at the bottom end of the grooving assembly plate. The angle adjusting assembly comprises a transverse flat plate fixedly installed on the lower middle portion of the slotting assembly plate and a vertical plate rotationally installed at one end of the transverse flat plate, a containing frame plate is installed on the end face of the outer side of the vertical plate, and a locking piece used for locking the neck tube is arranged on the containing frame plate. When the device is used, through an integrated structure of angle adjustment, holding and locking, infrared centering and height adaptation, the problem of vertical pipe welding positioning deviation is accurately solved, and the product consistency and the riding safety and controllability of a whole vehicle are improved.

Description

Technical Field

[0001] This invention relates to the field of welding and fixing equipment, and more specifically, to a vertical positioning fixture for welding the upright tube of a children's balance bike. Background Technology

[0002] Children's balance bikes are footless gliding vehicles designed specifically for children aged 2 to 5. They rely on children's feet to push off the ground to move forward, which can help develop their balance and limb coordination. They are a sports and entertainment tool for children in this age group.

[0003] As the core load-bearing component of the balance bike frame, the seat tube (also known as the head tube or neck tube) is located at the front of the frame and is used to install the front fork, steering components and handlebar tube. In order to meet the requirements of the overall vehicle geometry design and front wheel assembly, the seat tube must maintain a specific spatial tilt angle and be precisely calibrated in the vertical plane to ensure that the front wheel and handlebar tube face the same direction as the child rider's upper body after welding, thus ensuring riding comfort, handling stability and safety.

[0004] In the production of children's balance bikes, the welding position and angle of the stem and frame directly determine the riding comfort, handling stability, and safety of the entire vehicle. Currently, the stem welding positioning fixture mainly achieves the basic vertical positioning of the stem, but it is difficult to accurately adjust the tilt angle of the stem in the vertical plane. When different models need to switch the stem tilt angle, the existing fixture cannot be flexibly adapted, and the angle control accuracy is limited. At the same time, it is difficult to maintain the set angle stably during clamping and welding, which easily leads to poor consistency of the stem positioning angle of different batches of workpieces. The actual tilt angle deviates from the design angle, which in turn causes the front wheel and handlebar tube orientation to be mismatched with the rider's upper body direction, affecting the riding comfort, handling stability, and safety of the children's balance bike.

[0005] To address this issue, this application proposes a vertical positioning fixture for welding the riser of a children's balance bike. Summary of the Invention

[0006] Technical problem to be solved: In view of the problems existing in the prior art, the purpose of this invention is to provide a vertical positioning tool for welding the upright of a child balance bike, which solves the problems of difficulty in accurately adjusting the tilt angle during welding of the upright of a child balance bike, easy deviation during welding, resulting in poor product consistency and affecting the riding safety and handling stability of the whole vehicle.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vertical positioning fixture for welding the upright tube of a children's balance bike, comprising a base platform, a placement platform installed on one side of the top of the base platform, and a clamping assembly on the placement platform for clamping the frame. A slotted assembly plate is provided on the other side of the top of the base platform. An angle adjustment assembly is provided on the slotted assembly plate, and a lifting assembly is provided at the bottom end of the slotted assembly plate. The angle adjustment assembly includes: a horizontal plate fixedly installed in the lower part of the slotted assembly plate, and a vertical plate rotatably installed at one end of the horizontal plate. A placement frame is installed on the outer end face of the vertical plate, and a locking element for locking the neck tube is provided on the placement frame. A double-ring arc frame is installed on the inner end face of the vertical plate, the double-ring arc frame including an inner toothed arc frame of the outer ring and a locking arc frame of the inner ring. During operation, the inner toothed arc frame of the outer ring drives the vertical plate and the placement frame to rotate, adjusting the tilt angle between the clamped neck tube and the frame.

[0008] In a new embodiment, arc-shaped locking grooves are provided on both the left and right sides of the inner and outer ring walls of the locking frame, and the outer contact surface of the arc-shaped locking groove is a semi-metallic friction material layer.

[0009] In a new embodiment, the slotted assembly plate is provided with an angle lock assembly for locking the arc-shaped locking frame. The angle lock assembly includes an electric push rod, an upper support frame, and a lower pressure frame. An electric push rod is installed at the top of the horizontal plate, and the upper support frame is installed at the telescopic end of the electric push rod. A lower pressure frame is fixedly installed inside the slotted assembly plate at the top of the upper support frame, and the upper support frame slides on the lower pressure frame. An inner arc block is installed on the top wall of the upper support frame, and an outer arc block is installed at the bottom of the lower pressure frame. The inner and outer arc blocks are used to simultaneously abut against and lock the arc-shaped locking groove from both the inner and outer sides.

[0010] In a new embodiment, a spring column is slidably installed at the center of the top of the lower pressure frame, and the bottom end of the spring column is fixedly connected to the top of the outer arc block; lever plates are rotatably installed on both sides of the center of the top of the lower pressure frame, and the lever plates abut against the top of the slidingly extended upper support frame; when the upper support frame rises, one end of the lever plate is pushed up, and the other end of the lever plate presses down on the top of the spring column, so that the outer arc block abuts against the locking arc groove downward.

[0011] In a new embodiment, the lifting assembly includes: a locking base, slidably mounted on the other side of the top of the base; a positioning post, fixedly mounted on the top of the locking base; a hydraulic rod, mounted on the bottom end of the inner groove of the positioning post; and a sleeve, slidably mounted in the middle of the positioning post, with the top wall of the sleeve fixedly connected to the telescopic end of the hydraulic rod.

[0012] In a new embodiment, a peripheral arc plate is installed on one side of the top of the horizontal plate, and the other end of the peripheral arc plate is installed on the upper part of the slotted assembly plate; an angle display is slidably mounted on the middle of the peripheral arc plate, and the angle display is mounted on the outer ring wall of the inner toothed arc frame of the double-ring arc frame.

[0013] In a new embodiment, the clamping assembly includes: a movable platform slidably mounted on the top of the placement platform; a first clamping member mounted on one side of the top of the movable platform; and a second clamping member mounted on the other side of the top of the movable platform. Both the first clamping member and the second clamping member are equipped with a frame plate and two electric grippers on both sides to clamp and position the vehicle frame.

[0014] In a new embodiment, an infrared emitter is installed in the center of the positioning column facing the placement platform; an infrared vertical refraction tube is installed on one side of the top of the moving platform, the infrared emitter is aligned with the entrance of the infrared vertical refraction tube, and the infrared light is refracted and emitted upward, aligned with the central axis of the vehicle frame.

[0015] In a new embodiment, the locking component includes an inner ring bottom post and a tightening lock cylinder; the inner ring bottom post is fixedly installed at the bottom of the placement frame plate, and the tightening lock cylinder is threadedly installed at the top of the placement frame plate, and the tightening lock cylinder is coaxially arranged with the inner ring bottom post for clamping the neck tube from the top and bottom.

[0016] In a new embodiment, a driving component is installed on the back of the slotted assembly plate. The driving component uses a drive motor and gears to drive the internal gear arc frame that meshes with the gears to rotate.

[0017] Beneficial effects: Compared with the prior art, the advantages of this invention are: 1. The drive and locking functions are separated by the double-ring arc frame, the inner and outer four-corner clamping mechanism ensures zero angular deviation during the welding process, and the frame and seat tube are aligned with high precision by infrared vertical refraction centering. The lifting component is integrated to meet the height adaptation requirements of different models, thus solving the problems of inaccurate seat tube positioning, angle deviation, and poor consistency as a whole. This ensures that the welding angle of the seat tube is consistent with the design height, improving the riding comfort, handling stability and safety of the whole vehicle.

[0018] 2. By setting a double-ring arc frame as the core angle adjustment component, including an outer ring inner tooth arc frame and an inner ring locking arc frame that are coaxially set and can rotate relative to each other, the outer ring inner tooth arc frame is driven by a drive motor to rotate, thereby driving the neck tube to achieve tilt angle adjustment. The inner ring locking arc frame is dedicated to position locking after the angle adjustment is completed. The driving function and locking function are separated and set on two independent concentric rings. During the driving process, the locking mechanism has no frictional resistance. In the locked state, the driving mechanism is not affected by force and has no gap, which solves the problems of tooling adjustment shaking and locking loosening, and achieves high-precision adjustment and stable maintenance of the riser tilt angle.

[0019] 3. This application sets up an angle lock assembly, which adopts a single electric push rod to achieve a self-locking structure with four points of synchronous clamping in both the inner and outer directions. The electric push rod drives the upper support frame to rise, and the inner arc block of the top wall moves upward to press against the inner side wall of the inner ring locking arc frame, achieving two-point clamping on the inner side. At the same time, the top of the upper support frame pushes the lever plate to tilt up, and through the lever transmission, presses down the spring column, pushing the outer arc block to press down against the outer side wall of the locking arc frame, achieving two-point clamping on the outer side. This forms a full-enclosed clamping of the locking arc frame, resisting welding vibration interference and ensuring no angle deviation during the welding process.

[0020] 4. This application sets up an alignment structure consisting of an infrared emitter and an infrared vertical refraction tube. The infrared rays emitted by the infrared emitter are aligned with the inlet of the refraction tube and, after refraction, form an infrared spot vertically upward, which accurately illuminates the center axis of the frame. This converts the horizontal infrared rays into a vertically upward indicator spot, allowing the operator to intuitively and in real time judge the alignment status of the riser and the frame, avoiding misalignment of the center line of the frame and the neck tube due to alignment deviation, thereby eliminating welding errors. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the placement platform and slotted assembly plate of the present invention.

[0023] Figure 3 This is a schematic diagram of the clamping component structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the clamping assembly of the present invention from another perspective.

[0025] Figure 5 This is a schematic diagram of the angle adjustment component structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the double-ring arc frame structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the rotating state of the double-ring arc frame of the present invention.

[0028] Figure 8 This is a schematic diagram of the lifting component structure of the present invention.

[0029] Figure 9 This is a schematic diagram of the corner lock assembly structure of the present invention.

[0030] Figure 10 This is a schematic diagram of the position structure of the upper support frame and the lower pressure frame of the present invention.

[0031] Figure 11This is a schematic diagram showing the positioning state of the infrared vertical refraction tube of the present invention, which refracts infrared light onto the central axis of the vehicle frame.

[0032] Figure 12 This is a schematic diagram of the internal structure of the infrared vertical refraction tube of the present invention.

[0033] The attached diagram is labeled as follows: 1. Base platform; 2. Placement platform; 3. Clamping assembly; 31. Moving stage; 311. Infrared vertical refraction tube; 32. First clamping component; 33. Second clamping component; 4. Slotted assembly plate; 5. Angle adjustment assembly; 51. Horizontal plate; 52. Vertical plate; 53. Placement frame plate; 54. Locking component; 55. Double ring arc frame; 551. Internal toothed arc frame; 552. Locking arc frame; 553. Arc-shaped locking groove; 56. Outer arc plate; 57. Angle display; 6. Lifting assembly; 61. Locking base; 62. Positioning post; 621. Infrared transmitter; 63. Sleeve; 7. Angle lock assembly; 71. Electric push rod; 72. Upper support frame; 721. Inner arc block; 73. Lower pressure frame; 731. Outer arc block; 732. Spring column; 733. Lever plate. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] This application provides a vertical positioning fixture for welding the stem of a children's balance bike, which solves the problems of difficulty in accurately adjusting the tilt angle and easy deviation during welding, resulting in poor product consistency and affecting the riding safety and handling stability of the entire vehicle. In use, the fixture integrates angle adjustment, clamping and locking, infrared centering and height adaptation to accurately solve the problem of stem welding positioning deviation, thereby improving product consistency and the riding safety and handling of the entire vehicle.

[0036] The technical solutions in this application are intended to solve the above-mentioned technical problems, and the overall approach is as follows.

[0037] Example 1, please refer to Figures 1-12This application provides a vertical positioning fixture for welding the upright of a child balance bike, including a base platform 1, a placement platform 2 installed on one side of the top of the base platform 1, and a clamping assembly 3 on the placement platform 2 for clamping the frame. A slotted assembly plate 4 is provided on the other side of the top of the base platform 1; an angle adjustment assembly 5 is provided on the slotted assembly plate 4, and a lifting assembly 6 is provided at the bottom end of the slotted assembly plate 4; the angle adjustment assembly 5 includes: a horizontal plate 51 fixedly installed in the lower part of the slotted assembly plate 4, and a rotating... A vertical plate 52 is mounted on one end of a horizontal plate 51. A placement frame plate 53 is mounted on the outer end face of the vertical plate 52. The placement frame plate 53 is provided with a locking element 54 for locking the neck tube. A double-ring arc frame 55 is mounted on the inner end face of the vertical plate 52. The double-ring arc frame 55 includes an inner tooth arc frame 551 of the outer ring and a locking arc frame 552 of the inner ring. During operation, the inner tooth arc frame 551 of the outer ring drives the vertical plate 52 and the placement frame plate 53 to rotate, adjusting the tilt angle of the clamped neck tube and the frame.

[0038] Furthermore, the clamping assembly 3 includes: a movable platform 31, which is slidably mounted on the top of the placement platform 2; a first clamping member 32, which is mounted on one side of the top of the movable platform 31; and a second clamping member 33, which is mounted on the other side of the top of the movable platform 31. Both the first clamping member 32 and the second clamping member 33 are equipped with a frame plate and electric grippers on both sides to clamp and position the vehicle frame.

[0039] Furthermore, a drive component is installed on the back of the slotted assembly plate 4. The drive component uses a drive motor and gears to drive the internal gear arc frame 551, which meshes with the gears, to rotate.

[0040] In the preferred embodiment of this solution, the driving and locking functions are separated by a double-ring arc frame 55. An inner and outer four-corner clamping mechanism is used to ensure zero angular deviation during the welding process. In conjunction with infrared vertical refraction centering, the frame and seat tube are aligned with high precision. The lifting component 6 is integrated to meet the height adaptation requirements of different vehicle models. This solution solves the problems of inaccurate seat tube positioning, angle deviation, and poor consistency. It ensures that the welding angle of the seat tube is consistent with the design height, thereby improving the riding comfort, handling stability, and safety of the entire vehicle.

[0041] Specifically, the operation process of the vertical positioning fixture for welding the upright of the children's balance bike is as follows: First, place the balance bike frame stably on the placement platform 2 on the left side of the tooling. Use the first clamping member 32 and the second clamping member 33 in the clamping assembly 3 to clamp the corresponding parts of the frame to achieve clamping and positioning of the frame's central axis. At the same time, put the neck tube into the right placement frame plate 53 and rotate the tightening lock cylinder of the locking member 54 to form a tight upper and lower pressing fit with the inner ring bottom column to complete the neck tube locking. Second, the drive motor on the back of the slotted assembly plate 4 is started. The drive motor drives the drive gear to rotate, which in turn drives the inner gear arc frame 551 of the meshing outer ring to rotate. Since the inner gear arc frame 551 is fixedly connected to the vertical plate 52, it synchronously drives the vertical plate 52 and the placement frame plate 53 to rotate, thereby adjusting the welding angle of the neck tube clamped on the placement frame plate 53 relative to the frame, adapting to the welding requirements of different tilt angles of the frame neck tube. At the same time, in order to solve the problems of angle adjustment not being quantifiable and poor consistency among multiple batches of products, the angle display 57 installed on the outer ring wall of the inner gear arc frame 551 slides along the outer arc plate 56 to display and confirm the required tilt angle. When the value indicated by the angle display 57 reaches the set angle, an electrical signal is sent to make the drive motor stop automatically. Secondly, if there is a height misalignment between the frame and the neck tube, the hydraulic rod of the lifting component 6 can be activated. The telescopic end of the hydraulic rod pushes the sleeve 63 to slide smoothly up and down along the positioning post 62. The sleeve 63 simultaneously drives the slotted assembly plate 4 to rise and fall as a whole. This lifting process does not affect the angle accuracy that has been adjusted. The operator can observe the height matching status between the neck tube and the frame in real time. After adjusting to the appropriate docking height, the operation of the hydraulic rod is stopped. Third, at the same time, in order to ensure that the neck tube and the central axis of the frame are precisely aligned, the locking base 61 can be controlled to slide along the front and rear direction of the base 1, so that the infrared emitter 621 on the positioning column 62 emits infrared rays, which are precisely injected into the infrared vertical refraction tube 311 on the moving table 31. After being refracted, the infrared rays are emitted vertically upward, forming a clear infrared light spot that illuminates the central axis of the frame. The operator can judge the alignment status in real time through the infrared light spot, and fine-tune the locking base 61 to achieve high-precision alignment. At the same time, this step makes up for the misalignment defect of the riser tube and the frame assembly caused by the alignment deviation after the angle adjustment, ensuring the double accuracy of angle and axis, and providing a reliable guarantee for welding quality. Fourth, although the above steps have achieved precise docking between the neck tube and the frame, vibration during the welding process may still cause the angle to shift. Traditional single-point locking structures are difficult to resist such influences. Therefore, after the angle adjustment is completed, the electric push rod 71 of the corner lock assembly 7 is activated. The telescopic end of the electric push rod 71 extends upward smoothly, pushing the upper support frame 72 to slide upward along the lower pressure frame 73. The upward-moving upper support frame 72 pushes the lever plate 733 installed on the lower pressure frame 73, causing one end to tilt up. Then, the other end of the lever plate 733 presses down the spring column 732, simultaneously triggering the locking action of the upper support frame 72 and the lower pressure frame 73 on the inner and outer arc-shaped locking grooves 553 of the locking arc frame 552, forming a two-way four-corner self-locking structure. The inner locking mechanism is achieved by the upward movement of the inner arc block 721 on the top wall of the upper support frame 72, which presses against the arc-shaped locking groove 553 on the inner wall of the locking arc frame 552, thus achieving two-point clamping on the inner side. The outer locking mechanism is achieved by the push lever plate 733 at the top of the upper support frame 72, which drives the spring column 732 to push the outer arc block 731 downward to press against the arc-shaped locking groove 553 on the outer wall of the locking arc frame 552, thus achieving two-point clamping on the outer side. The two-way synchronous locking can be achieved by a single electric push rod 71, so that the inner arc block 721 and the outer arc block 731 form a full-encircling clamping of the locking arc frame 552, effectively resisting the angle displacement caused by welding vibration, achieving zero angle drift during welding, and firmly fixing the angle position of the inner toothed arc frame 551 and the vertical plate 52. Fifth, after all positioning steps are completed, welding is performed on the joint between the riser and the frame by an external welding robotic arm or manually. During the welding process, the four-corner self-locking structure remains stable and locked, continuously resisting the risk of angular displacement caused by high welding temperature and vibration. At the same time, infrared alignment can indicate the relative alignment position of the neck tube and the frame in real time (which can be monitored in real time through an external monitoring system), ensuring that the verticality and coaxiality of the riser and the frame remain stable throughout the welding process, and avoiding product defects caused by alignment deviation. Sixth, after the welding operation is completed, the electric push rod 71 retracts, driving the upper support frame 72 to move downwards, and the inner arc block 721 moves downwards and disengages from the inner wall of the arc locking frame 552; at the same time, the upper support frame 72 no longer pushes the lever plate 733, the spring column 732 automatically resets, driving the outer arc block 731 to rise and disengage from the outer wall of the arc locking frame 552, the four corner locking structure is released with one click, and then the locking base 61 slides horizontally along the base 1 back to the initial position, the tightening lock cylinder of the rotating locking component 54 quickly releases the neck tube, and the electric gripper of the clamping component 3 releases simultaneously. The overall process is simple and efficient, which can meet the production needs of efficient flow of the production line.

[0042] In this embodiment, please refer to Figure 6 and Figure 9 As shown, the inner and outer ring walls of the locking frame 552 are provided with arc-shaped locking grooves 553 on both the left and right sides, and the outer contact surface of the arc-shaped locking grooves 553 is a semi-metallic friction material layer.

[0043] In the preferred embodiment of this solution, an arc-shaped locking groove 553 is provided. The arc-shaped structures on the left and right sides of the inner and outer ring walls of the arc-shaped locking groove 553 can fit against the inner arc block 721 and the outer arc block 731. With the help of the semi-metallic friction material layer, the contact friction is increased. When the corner lock assembly 7 is activated, the inner arc block 721 and the outer arc block 731 can be embedded in the arc-shaped locking groove 553 to achieve a stable lock. This effectively improves the locking reliability of the locking arc frame 552, avoids the displacement of the locking arc frame 552 caused by welding vibration, and at the same time, the arc structure is adapted to the curvature setting of the locking arc frame 552 to ensure that the locking arc frame 552 will not be damaged during locking, further ensuring the angle positioning accuracy.

[0044] In this embodiment, please refer to Figure 9 and Figure 10 As shown, the slotted assembly plate 4 is provided with an angle lock assembly 7 for locking the arc-shaped locking frame 552. The angle lock assembly 7 includes an electric push rod 71, an upper support frame 72, and a lower pressure frame 73. An electric push rod 71 is installed at the top of the horizontal plate 51, and an upper support frame 72 is installed at the telescopic end of the electric push rod 71. A lower pressure frame 73 is fixedly installed inside the slotted assembly plate 4 at the top of the upper support frame 72, and the upper support frame 72 slides on the lower pressure frame 73. An inner arc block 721 is installed on the top wall of the upper support frame 72, and an outer arc block 731 is installed at the bottom of the lower pressure frame 73. The inner arc block 721 and the outer arc block 731 are used to simultaneously abut against the locking arc-shaped locking groove 553 from both the inner and outer sides.

[0045] In a preferred embodiment of this solution, by setting up an electric push rod 71, an upper support frame 72, and a lower pressure frame 73, the electric push rod 71 can drive the upper support frame 72 to slide up and down along the lower pressure frame 73, causing the inner arc block 721 on the upper support frame 72 to move synchronously, and at the same time, the outer arc block 731 on the lower pressure frame 73 to move in conjunction with it, so that the inner arc block 721 and the outer arc block 731 can simultaneously abut against and lock the arc-shaped locking groove 553 from the inner and outer sides of the locking arc frame 552, forming a double-sided, multi-point clamping locking structure. Compared to single-direction locking, the above-mentioned synchronous locking structure provides more balanced force and a tighter fit, significantly enhancing vibration and impact resistance. This greatly improves the locking stability of the 552 locking arc frame, ensuring that the neck tube welding angle remains fixed during the welding process, avoiding angle deviation that could affect welding quality, and effectively improving the pass rate and product consistency of the neck tube welding products for the balance vehicle.

[0046] In this embodiment, please refer to Figure 9 and Figure 10 As shown, a spring column 732 is slidably installed at the top center of the lower pressure frame 73, and the bottom end of the spring column 732 is fixedly connected to the top of the outer arc block 731; lever plates 733 are rotatably installed on both sides of the top center of the lower pressure frame 73, and the lever plates 733 abut against the top of the slidingly extended upper support frame 72; when the upper support frame 72 rises, one end of the lever plate 733 is pushed up, and the other end of the lever plate 733 presses down on the top of the spring column 732, so that the outer arc block 731 abuts against the locking arc groove 553.

[0047] In the preferred embodiment of this solution, by setting up a spring column 732 and a lever plate 733, the lever transmission is used to achieve efficient force transmission and direction conversion. When the upper support frame 72 rises under the drive of the electric push rod 71, it can simultaneously push one end of the lever plate 733 to tilt upwards, thereby driving the other end of the lever plate 733 to press down on the spring column 732. This causes the spring column 732 to push downwards and abut against the outer arc block 731 and the arc-shaped locking groove 553 on the outside of the locking arc frame 552, achieving reliable locking on the outside. At the same time, the spring column 732 can provide flexible buffer and pre-tightening elasticity, making the contact between the outer arc block 731 and the arc-shaped locking groove 553 more tightly and the force more evenly distributed. This ensures sufficient locking force and avoids structural deformation or excessive wear caused by rigid compression. The entire system can be driven simultaneously by a single electric push rod 71 to achieve bidirectional locking action, effectively simplifying the tooling structure, reducing processing and assembly costs, and improving the stability and service life of the locking mechanism.

[0048] In this embodiment, please refer to Figure 8 As shown, the lifting assembly 6 includes: a locking base 61, which is slidably installed on the other side of the top of the base 1; a positioning post 62, which is fixedly installed on the top of the locking base 61; a hydraulic rod, which is installed at the bottom of the inner groove of the positioning post 62; and a sleeve 63, which slides in the middle of the positioning post 62, and the top wall of the sleeve 63 is fixedly connected to the telescopic end of the hydraulic rod.

[0049] In the preferred embodiment of this solution, by setting up a locking base 61, a positioning post 62, a hydraulic rod and a sleeve 63, the sleeve 63 is driven by the hydraulic rod to move linearly up and down along the positioning post 62. The sleeve 63 can simultaneously drive the slotted assembly plate 4 and the neck tube clamping and angle adjustment structure above it to move up and down synchronously. Without changing the adjusted tilt angle, the height docking adjustment between the neck tube and the frame can be accurately achieved. Secondly, the positioning post 62 guides and limits the sleeve 63, ensuring high coaxiality of the lifting mechanism, preventing swaying and tilting, and avoiding interference with the angular positioning accuracy during lifting. At the same time, the locking base 61 can slide flexibly along the base platform 1, and with the height adjustment, it can achieve precise alignment of the neck tube and the frame in multiple degrees of freedom. It can adapt to the welding needs of balance bike frames and neck tubes of different specifications, heights, and models, significantly improving the applicability, docking accuracy, and production versatility of the tooling.

[0050] In this embodiment, please refer to Figure 5 and Figure 7 As shown, a peripheral arc plate 56 is installed on one side of the top of the horizontal plate 51, and the other end of the peripheral arc plate 56 is installed on the upper part of the slotted assembly plate 4; an angle display 57 is slidably mounted in the middle of the peripheral arc plate 56, and the angle display 57 is mounted on the outer ring wall of the inner tooth arc frame 551 of the double ring arc frame 55.

[0051] In the preferred embodiment of this solution, by setting an outer arc plate 56 and an angle display 57, the inner gear arc frame 551 can drive the angle display 57 to slide synchronously along the outer arc plate 56 when it rotates. The outer arc plate 56 provides stable guidance and stroke limit for the angle display 57, ensuring accurate and error-free angle display. Meanwhile, the angle display 57 can display the tilt angle of the neck tube in real time and intuitively, making the angle adjustment process visible and quantifiable. This makes it easy for operators to accurately set and calibrate the welding angle, effectively solving the problems of traditional angle adjustment being unquantifiable and inconsistent. It also improves the uniformity of welding angles for multiple batches of products, simplifies adjustment operations, and enhances the overall efficiency and welding accuracy of the tooling.

[0052] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 5 As shown, an infrared emitter 621 is installed in the center of the positioning post 62 facing the placement platform 2; an infrared vertical refraction tube 311 is installed on one side of the top of the moving platform 31, the infrared emitter 621 is aligned with the entrance of the infrared vertical refraction tube 311, and the infrared rays are refracted and emitted upward, aligned with the central axis of the frame.

[0053] In the preferred embodiment of this solution, by setting up an infrared emitter 621 and an infrared vertical refraction tube 311, the infrared rays emitted by the infrared emitter 621 can enter the infrared vertical refraction tube 311 for correction and alignment. After refraction, the infrared light spot is formed vertically upward and aligned with the central axis of the frame. The operator can judge the relative alignment position of the neck tube (the central axis of the infrared structure of the positioning column 62, which also represents the relative central axis of the neck tube) and the frame in real time through the infrared light spot, so as to achieve high-precision coaxial alignment between the neck tube and the frame. This can effectively avoid defects such as welding misalignment and coaxiality deviation caused by alignment deviation, while simplifying the alignment operation, reducing human error, and ensuring that the verticality and coaxiality of the riser tube and the frame remain stable during the welding process.

[0054] In this embodiment, please refer to Figure 5 As shown, the locking component 54 includes an inner ring bottom post and a tightening lock cylinder; the inner ring bottom post is fixedly installed at the bottom of the placement frame plate 53, and the tightening lock cylinder is threadedly installed at the top of the placement frame plate 53, and the tightening lock cylinder is coaxially arranged with the inner ring bottom post, for clamping the neck tube from the top and bottom directions.

[0055] In the preferred embodiment of this solution, an inner ring bottom post and a tightening locking cylinder are provided. The inner ring bottom post provides stable support and radial positioning for the lower end of the neck tube, while the tightening locking cylinder, through threaded engagement, can move up and down along the placement frame plate 53, forming a coaxial clamping structure with the inner ring bottom post to reliably clamp and fix the neck tube. The coaxial arrangement of the two ensures that the central axis of the neck tube does not deviate after clamping, resulting in high clamping fit and uniform force distribution. This ensures both clamping stability and prevents damage to the neck tube surface. The overall operation is simple and quick, allowing for rapid clamping and disassembly of the neck tube, effectively improving clamping efficiency and meeting the needs of efficient continuous production lines.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical positioning fixture for welding the upright of a children's balance bike, comprising a base (1), a placement platform (2) mounted on one side of the top of the base (1), and a clamping assembly (3) disposed on the placement platform (2) for clamping the frame, wherein a slotted assembly plate (4) is provided on the other side of the top of the base (1); characterized in that: The slotted assembly plate (4) is provided with an angle adjustment component (5), and the bottom end of the slotted assembly plate (4) is provided with a lifting component (6). The angle adjustment component (5) includes: A horizontal plate (51) is fixedly installed in the lower part of the slotted assembly plate (4), and a vertical plate (52) is rotatably installed at one end of the horizontal plate (51). A placement frame plate (53) is installed on the outer end face of the vertical plate (52), and a locking member (54) for locking the neck tube is provided on the placement frame plate (53). The vertical plate (52) is equipped with a double-ring arc frame (55) on its inner end face. The double-ring arc frame (55) includes an inner tooth arc frame (551) of the outer ring and a locking arc frame (552) of the inner ring. During operation, the inner toothed arc frame (551) of the outer ring drives the vertical plate (52) and the placement frame plate (53) to rotate, adjusting the tilt angle of the clamped neck tube and the frame.

2. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, The inner and outer ring walls of the locking frame (552) are provided with arc-shaped locking grooves (553) on both the left and right sides, and the outer contact surface of the arc-shaped locking grooves (553) is a semi-metallic friction material layer.

3. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, The slotted assembly plate (4) is provided with an angle lock assembly (7) for locking the locking arc frame (552). The angle lock assembly (7) includes an electric push rod (71), an upper support frame (72), and a lower pressure frame (73). An electric push rod (71) is installed at the top of the horizontal plate (51), and an upper support frame (72) is installed at the telescopic end of the electric push rod (71). The upper support frame (72) is provided with a lower pressure frame (73) fixedly installed inside the slotted assembly plate (4) at the top, and the upper support frame (72) slides on the lower pressure frame (73); The upper support frame (72) has an inner arc block (721) installed on its top wall, and the lower pressure frame (73) has an outer arc block (731) at its bottom. The inner arc block (721) and the outer arc block (731) are used to simultaneously abut against the locking arc groove (553) from both the inner and outer sides.

4. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 3, characterized in that, A spring column (732) is slidably installed at the top center of the lower pressure frame (73), and the bottom end of the spring column (732) is fixedly connected to the top of the outer arc block (731). The lower pressure frame (73) has lever plates (733) rotatably installed on both sides of the top center of the lower pressure frame (73), and the lever plates (733) abut against the top of the sliding upper support frame (72); When the upper support frame (72) rises, one end of the push lever plate (733) is lifted up, and the other end of the lever plate (733) presses down on the top of the spring column (732), so that the outer arc block (731) abuts downward against the locking arc groove (553).

5. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, The lifting component (6) includes: The base plate (61) is slidably mounted on the other side of the top of the base plate (1); The positioning post (62) is fixedly installed on the top of the lock base (61); The hydraulic rod is installed at the bottom of the groove inside the positioning column (62); The sleeve (63) slides in the middle of the positioning post (62), and the top wall of the sleeve (63) is fixedly connected to the telescopic end of the hydraulic rod.

6. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, A peripheral arc plate (56) is installed on one side of the top of the horizontal plate (51), and the other end of the peripheral arc plate (56) is installed on the upper part of the slotted assembly plate (4). An angle display (57) is slidably mounted on the middle of the outer arc plate (56), and the angle display (57) is mounted on the outer ring wall of the inner toothed arc frame (551) of the double ring arc frame (55).

7. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 5, characterized in that, The clamping assembly (3) includes: The mobile platform (31) is slidably mounted on top of the placement platform (2); The first clamping member (32) is installed on one side of the top of the moving platform (31); The second clamp (33) is installed on the other side of the top of the moving platform (31); The first clamping member (32) and the second clamping member (33) both use a frame plate and electric grippers on both sides to clamp and position the vehicle frame.

8. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 7, characterized in that, An infrared transmitter (621) is installed in the center of the positioning post (62) facing the placement platform (2). An infrared vertical refraction tube (311) is installed on one side of the top of the mobile platform (31). The infrared emitter (621) is aligned with the entrance of the infrared vertical refraction tube (311), and the infrared rays are refracted and emitted upward, aligning with the central axis of the frame.

9. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, The locking element (54) includes an inner ring bottom post and a tightening lock cylinder; The inner ring bottom post is fixedly installed at the bottom of the placement frame plate (53), and the tightening lock cylinder is threadedly installed at the top of the placement frame plate (53). The tightening lock cylinder is coaxially arranged with the inner ring bottom post and is used to clamp the neck tube from the top and bottom.

10. The verticality positioning fixture for welding the upright tube of a children's balance bike as described in claim 1, characterized in that, The slotted assembly plate (4) has a drive component installed on its back. The drive component uses a drive motor and gears to drive the internal gear arc frame (551) that meshes with the gears to rotate.

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