Circuit board welding positioning tool

Abstract

The application discloses a kind of circuit board welding positioning tool, including welding machine, positioning assembly and conveying assembly, the surface of welding machine is fixedly installed top cylinder body and multi-axis welding machine, top cylinder body is used to drive multiple positioning assembly lifting, realize multi-station automatic clamping.The positioning assembly includes clamping seat, worm drive assembly, clamping rod, cam and heat-conducting support plate, wherein worm drive assembly is deflected by shaft rod cam, the inclined cam surface of cam and clamping rod sliding abutment to realize clamping action;Chuck is externally flexible, can be self-adapting to fit the edge of circuit board, avoid clamping deformation.Heat-conducting support plate is internally provided with refrigeration coil pipe and composite liquid metal heat-conducting paste, for fast heat dissipation and temperature equalization control.Conveying assembly includes conveying seat, belt, material sensor and drive motor, realize the automatic conveying of circuit board and station synchronous detection.The tool structure is compact, clamping precision is high, heat dissipation efficiency is excellent, can realize multi-station synchronous welding and automation control, improve welding stability and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of electronic manufacturing technology, specifically to a circuit board welding positioning fixture. Background Technology

[0002] In existing PCB welding production lines, PCBs typically require manual or semi-automatic clamping before welding to ensure stable welding point positions. However, traditional PCB clamping devices generally employ single-sided cylinder clamping or mechanical screw clamping structures. Their clamping action relies on rigid compression, making it impossible to adaptively adjust to PCB thickness and pad distribution, easily leading to warping or uneven stress on PCB edges. Especially in multi-point welding or automated production scenarios, these devices suffer from low positioning accuracy, poor synchronization, and inconsistent clamping across multiple stations, thus affecting welding point accuracy and production efficiency.

[0003] In existing equipment, a common clamping method is to use a motor-driven lead screw to achieve parallel slider clamping. While this structure can achieve basic fixation, the clamping force distribution is uneven, and it cannot guarantee synchronous movement of the clamps on both sides. When thermal expansion and contraction or pad deformation occurs during soldering, the circuit board is prone to micro-displacement, leading to soldering deviations and cold solder joints. In addition, some clamps use rubber pads or soft shims for auxiliary cushioning, but this design is usually a passive contact and cannot form a dynamic fit structure. When producing circuit boards of multiple specifications on the same line, frequent fixture changes are required, resulting in long debugging times and low automation.

[0004] In terms of welding thermal management, traditional heat dissipation structures mostly use aluminum plates or air cooling. Although these methods can reduce the temperature of the welding area to some extent, the limited thermal conductivity and uneven temperature distribution mean that the solder pads and chip areas are still prone to oxidation or delamination due to localized overheating. In addition, existing heat-conducting trays are mostly single-layer metal block structures with high thermal inertia and slow response, which cannot meet the real-time temperature control requirements of high-speed welding processes, resulting in problems such as large fluctuations in welding quality and insufficient solder joint reliability.

[0005] In terms of production cycle control, traditional circuit board welding fixtures mostly rely on manual feeding or intermittent pneumatic pushing mechanisms for material loading. These structures suffer from detection delays and uneven feeding, and fail to establish signal linkage with the welding equipment, often resulting in welding starting before proper positioning, leading to welding misalignment or incomplete soldering risks. While some automated lines have introduced belt conveyor structures, they generally lack intelligent detection feedback and synchronous control logic, making it difficult to coordinate the conveying and welding cycles, thus affecting the overall automation efficiency of the line.

[0006] In view of this, we have studied and improved the existing problems and provided a circuit board welding positioning fixture to solve the current problems. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0007] This invention aims to overcome the problems of existing circuit board welding positioning fixtures, such as high clamping rigidity, low heat dissipation efficiency, insufficient positioning accuracy, and uncoordinated conveying control. It provides a circuit board welding positioning fixture with a compact structure, high clamping accuracy, excellent thermal conductivity, and automatic conveying and welding synchronous control functions.

[0008] This invention provides a circuit board welding positioning fixture, including a welding machine, positioning components, and a conveying component. A top cylinder and a multi-axis welding machine are fixedly mounted on the welding machine. The top cylinder drives the positioning components to rise and fall, enabling automatic clamping and release of the circuit board. Multiple positioning components are arranged in a straight line along the surface of the welding machine, forming a multi-station automatic welding structure, which can achieve synchronous clamping and welding actions in multi-point welding operations.

[0009] This tooling achieves high-precision positioning through a combination structure of "worm gear drive - cam deflection - clamping rod clamping", efficient thermal management through a composite structure of "cooling coil - liquid metal thermal conductive pad", and automated conveying and cycle control through "servo drive - sensor detection", thereby achieving a comprehensive effect of stable welding, rapid heat dissipation and automated production.

[0010] This invention discloses a circuit board welding positioning fixture, comprising a welding machine, positioning components, and a conveying component, as well as a top cylinder and a multi-axis welding machine fixedly mounted on the surface of the welding machine. The top cylinder drives the positioning components for lifting and lowering control, and multiple positioning components are arranged in a straight line along the surface of the welding machine to form a multi-station structure.

[0011] This design achieves automated batch clamping by coordinating the synchronous lifting of multiple workstations through the top cylinder, which can effectively reduce manual operation and improve the accuracy of welding cycle time.

[0012] In a preferred embodiment, the positioning assembly includes a clamp, a worm gear drive assembly, a clamp rod, a cam, and a heat-conducting support plate. The clamp serves as the main support component, with a support platform fixedly mounted on its upper surface; the worm gear drive assembly is fixed to the surface of the clamp, and a shaft is provided at its output end, with the cam fixedly sleeved onto the surface of the shaft.

[0013] When the worm gear drive assembly rotates, the shaft drives the cam to deflect. The convex surface of the cam slides against the clamping rod, causing the clamping rod to deflect around the bottom axis, thereby achieving automatic clamping.

[0014] This composite mechanism can achieve high-precision three-in-one "rotation-deflection-clamping" actions within a limited space, which can significantly improve clamping synchronization and repeatability, and prevent the circuit board from shifting during the soldering process.

[0015] In a preferred embodiment, a chuck is provided at the top of the clamping rod. A flexible adhesive is rotatably mounted on the outer surface of the chuck. The flexible adhesive has an arc-shaped structure and an embedded highly elastic silicone layer to form an adaptive pressure surface when it comes into contact with the edge of the circuit board. The chuck and the inclined convex surface of the cam slide against each other, and when the cam deflects, it drives the clamping rod to achieve synchronous clamping and opening actions. A stop bar is provided on the outer surface of the middle part of the clamping rod, forming a limit stroke structure with the inclined convex surface of the cam to prevent over-clamping or loosening failure.

[0016] The synergistic design of the flexible adhesive strip and the abutment strip enables flexible adjustment and limit control during clamping, which specifically prevents warping caused by uneven force on the circuit board and improves clamping stability and structural durability.

[0017] In a preferred embodiment, the heat-conducting tray is fixedly mounted on the top surface of the platform, and contains a cooling coil and a composite liquid metal thermal conductive patch. Both are integrally press-fitted. Coolant is circulated through the cooling coil to rapidly dissipate welding heat, and the composite liquid metal thermal conductive patch has high thermal conductivity, enabling heat diffusion and conduction even under instantaneous high-temperature welding conditions, thus reducing the peak temperature of the solder joint. Furthermore, the surface of the heat-conducting tray is covered with an anti-splatter nano-coating to prevent solder residue and contamination.

[0018] This heat conduction system can effectively control the uniformity of temperature distribution during the welding process, specifically enabling rapid cooling and solder joint protection, thereby preventing problems such as cold solder joints, solder pad warping, and circuit layer delamination.

[0019] In a preferred embodiment, the conveying assembly includes a conveyor base, a belt, and a material sensor. A drive motor is fixedly mounted on the conveyor base, driving the belt to rotate and achieve linear conveying of the circuit board. The material sensor is mounted on the surface of the conveyor base to detect the circuit board's arrival signal and is connected to a multi-axis welding electromechanical system to achieve synchronous start control of station detection and welding. The drive motor adopts a servo motor structure, and its output shaft is connected to the belt via a coupling to achieve adjustable conveying speed to adapt to different production cycles and circuit board sizes.

[0020] This automatic conveying control system enables intelligent linkage between welding and transmission, specifically improving the efficiency of workstation switching and the synchronization of welding cycle time, thereby achieving continuous automatic production.

[0021] In a preferred embodiment, the welding machine adopts a double-layer steel structure support body with an internal vibration isolation cavity to absorb the vibration energy of the multi-axis welding machine during operation and reduce the resonance effect of the equipment.

[0022] This design can improve the static stability of the clamping and positioning components, maintain the accuracy of the solder joint position, and ensure welding repeatability.

[0023] The beneficial effects achieved by this invention are as follows: 1. In this invention, an automatic clamping and rapid release of the circuit board is achieved by setting a composite deflection clamping structure consisting of a worm gear drive assembly, a shaft, a cam, and a clamping rod. This structure converts the rotational motion of the drive mechanism into the deflection and closing action of the clamping rod, resulting in high clamping synchronization and excellent positioning accuracy, effectively avoiding the clamping deviation and board warping problems present in traditional rigid clamping mechanisms.

[0024] 2. In this invention, a cooling coil and a composite liquid metal thermal pad are integrated inside the heat-conducting tray to form a high thermal conductivity composite heat dissipation system. This structure can quickly absorb and conduct heat from the solder joint during the welding process, preventing local overheating that could lead to solder pad deformation or solder layer peeling, thereby significantly improving the temperature control accuracy of the welding area and the reliability of the finished product.

[0025] 3. In this invention, the automatic conveying and synchronous detection of circuit boards between welding stations are achieved through the coordinated control of the drive motor and material sensor in the conveying assembly. The material sensor provides real-time feedback of the board position signal, and the multi-axis welding machine can automatically start the welding program according to the detection signal, forming a closed-loop control system. This results in stable production cycle, smooth process connection, and a high degree of automation of the entire machine. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the conveying component structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the positioning component structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a worm gear drive assembly and support structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the clamping rod and cam mounting structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the clamp and cam structure according to an embodiment of the present invention; Figure 7 This is a partial cross-sectional structural diagram of a heat-conducting tray according to an embodiment of the present invention.

[0027] Figure label: 100. Welding machine base; 110. Top cylinder body; 120. Multi-axis welding machine; 200. Positioning assembly; 210. Clamp; 220. Worm gear drive assembly; 230. Clamping rod; 240. Cam; 250. Heat-conducting support plate; 211. Support platform; 221. Shaft; 231. Clamp; 232. Flexible adhesive; 233. Support bar; 241. Angled convex surface; 251. Cooling coil; 252. Composite liquid metal heat-conducting adhesive; 300. Conveying assembly; 310. Conveying seat; 320. Belt; 330. Material sensor; 311. Support bar; 312. Drive motor. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0029] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0030] The following describes, with reference to the accompanying drawings, some embodiments of a circuit board welding positioning fixture provided by the present invention.

[0031] Combination Figures 1-7 As shown, the present invention provides a circuit board welding positioning fixture, including a welding machine 100, a positioning component 200, and a conveying component 300. A top cylinder 110 and a multi-axis welding machine 120 are fixedly mounted on the upper surface of the welding machine 100. The top cylinder 110 is used to control the lifting and lowering of the positioning component 200, thereby achieving automatic adjustment of the clamping height between circuit boards of different thicknesses. The multi-axis welding machine 120 is fixedly mounted in the upper area of ​​the welding machine 100 and is used to perform multi-point welding operations on the positioned circuit boards.

[0032] The welding machine 100 serves as the support platform for the entire machine. It adopts a rigid steel structure and has several positioning components 200 arranged on its upper end. Each positioning component 200 is arranged in a straight line along the length of the welding machine 100 to form multiple independent welding stations. Each station can independently perform the tasks of clamping, heat dissipation, and welding of the circuit board, thereby realizing synchronous welding of multiple stations.

[0033] In this embodiment, the positioning assembly 200 includes a clamp 210, a worm gear drive assembly 220, a clamping rod 230, a cam 240, and a heat-conducting support plate 250.

[0034] The clamp 210 is fixedly installed at the output end of the top cylinder 110, serving as the mounting base for each positioning mechanism. A support platform 211 is fixedly installed on the upper surface of the clamp 210, which supports the circuit board body and the heat-conducting support plate 250. The bottom surface of the support platform 211 is provided with a bushing structure, and the output shaft 221 of the worm gear drive assembly 220 can be rotatably sleeved on the inner side of the bushing to achieve stable rotational support.

[0035] The worm gear drive assembly 220 is fixedly mounted on the surface of the clamp 210. It has a worm and worm wheel meshing structure inside, and achieves torque output through motor or mechanical transmission. The output end of the worm gear drive assembly 220 is a shaft 221, which passes through the through hole inside the clamp 230 and is fixedly connected to the surface of the cam 240 after passing through.

[0036] Furthermore, clamping rods 230 are symmetrically arranged on both sides of clamping base 210, and their bottom ends are rotatably connected to the surface of clamping base 210 through a rotating shaft structure, enabling them to deflect around the bottom rotating shaft. A chuck 231 is provided on one side of the clamping rod 230, and the chuck 231 maintains a sliding contact relationship with the cam 240. The surface of the cam 240 is provided with a convex surface 241. When the worm gear drive assembly 220 drives the shaft 221 to rotate, the contact surface between the convex surface 241 and the chuck 231 is displaced along the sliding direction, thereby causing the clamping rod 230 to deflect and achieve the clamping action.

[0037] In this clamping structure, the cam 240 and the clamping rod 230 form an integrated motion linkage relationship of "rotation-deflection-clamping". When the cam 240 rotates, the clamping rods 230 on both sides synchronously close towards the center to clamp the two edges of the circuit board.

[0038] In this embodiment, a flexible adhesive pad 232 is rotatably mounted on the outer surface of the clamp 231. The flexible adhesive pad 232 has an arc-shaped structure, and its inner layer is embedded with a highly elastic silicone pad. During the clamping process, the flexible adhesive pad 232 can adaptively fit according to the slight differences in the thickness and angle of the circuit board edge, thereby achieving a stable pressure distribution and avoiding deformation or cracks in the circuit board caused by rigid clamping.

[0039] A stop bar 233 is also provided on the outer surface of the middle part of the clamping rod 230 to control the maximum swing angle of the clamping rod 230. The stop bar 233 and the inclined convex surface 241 of the cam 240 form a limit stroke control structure, which provides mechanical limit during the clamping and releasing action, so as to keep the clamping stroke stable and avoid damage to the circuit board due to excessive clamping.

[0040] In this embodiment, the heat-conducting tray 250 is mounted on the top surface of the support platform 211 and adopts an integral composite heat-conducting structure. The heat-conducting tray 250 contains a cooling coil 251 and a composite liquid metal thermal conductive patch 252, which are fixedly combined using an integral pressing molding method. The composite liquid metal thermal conductive patch 252 features high thermal conductivity, good flexibility, and fast thermal response. This material is formed by combining liquid metal with a polymer matrix and thermally conductive filler particles, achieving a good balance between thermal conductivity and mechanical stability.

[0041] Coolant can circulate inside the cooling coil 251, and as the coolant flows through the coil, it can quickly remove the heat generated in the welding area. The composite liquid metal thermal pad 252 is directly laid on the upper surface of the cooling coil 251. It has high thermal conductivity and can achieve rapid heat conduction and diffusion during welding, forming a localized and efficient heat dissipation path. The surface of the thermally conductive plate 250 is also covered with an anti-soldering nano-coating to prevent solder splatter from adhering and reducing thermal conductivity.

[0042] Through this structural design, when the composite liquid metal thermally conductive patch is attached between the thermally conductive tray (250) and the bottom surface of the circuit board, its liquid metal layer can automatically flow and fill the microscopic uneven surface under slight pressure, achieving zero-gap contact and thus significantly reducing interfacial thermal resistance. During the welding process, the high thermal conductivity of the liquid metal can quickly absorb and diffuse the welding heat, which is carried away by the coolant circulation inside the cooling coil (251), achieving dynamic thermal equilibrium. This process has a high response speed and a stable heat conduction path, which can control the temperature fluctuation of the solder joint area within ±2℃. After welding, the circuit board can cool down in a short time, preventing solder joint oxidation, pad warping, and circuit board delamination.

[0043] In this embodiment, the conveying assembly 300 includes a conveyor seat 310, a belt 320, and a material sensor 330. The conveyor seat 310 is arranged along the length of the welding machine 100, forming a straight conveying path. The belt 320 is installed parallel above the conveyor seat 310 to carry the circuit board and convey it to each workstation.

[0044] A drive motor 312 is fixedly mounted at one end of the conveyor base 310. The drive motor 312 adopts a servo motor structure, and its output shaft is connected to the belt 320 through a coupling. The servo motor achieves precise adjustment of the conveying speed through control signals to adapt to the welding cycle requirements of circuit boards of different specifications. Material sensors 330 are installed at both ends of the surface of the conveyor base 310 to detect the circuit board arrival signal and transmit the signal to the control system of the multi-axis welding machine 120, thereby realizing the automatic synchronous start of the welding program.

[0045] When the material sensor 330 detects that the circuit board has reached the designated station, the drive motor 312 stops conveying, the top cylinder 110 drives the positioning component 200 to rise, and the clamping rod 230 clamps the circuit board under the action of the cam 240, completing automatic positioning. After welding is completed, the top cylinder 110 descends, the worm gear drive component 220 reverses to open the clamping rod 230, the circuit board is released, and then the belt 320 continues to convey it to the next station.

[0046] In this embodiment, the welding machine 100 adopts a double-layer steel structure support design with an internal vibration isolation cavity to absorb the vibration energy during the operation of the multi-axis welding machine 120, thereby maintaining the accuracy and stability of the clamping position and reducing welding offset.

[0047] The top cylinder 110 can be a servo lifting cylinder to achieve higher precision vertical posture control. The worm gear drive assembly 220 uses a built-in encoder to provide feedback on the rotation angle, ensuring clamping synchronization and repeatability.

[0048] Working principle and usage process of this invention: During operation, the welding machine base 100 serves as the installation and support foundation for the entire machine, with a top cylinder 110 and a multi-axis welding machine 120 fixed on its upper end. The top cylinder 110 drives multiple positioning components 200 to achieve synchronous lifting and lowering, adapting to the clamping height of circuit boards of different thicknesses and batches. The positioning components 200 are arranged in a straight line along the welding machine base 100 to form multiple independent working units, which can achieve multi-station parallel welding through program control.

[0049] Specifically, the positioning assembly 200 is mainly used to clamp the circuit board and control its heat dissipation. The clamping base 210 is the mounting base for each clamping mechanism, and a support platform 211 is mounted on its upper surface. The support platform 211 is used to support the bottom of the circuit board and carry the heat-conducting support plate 250. When the top cylinder 110 drives the positioning assembly 200 to rise, the circuit board is sent into the clamping area; the worm gear drive assembly 220 starts to rotate, and its internal transmission mechanism drives the output shaft 221 to rotate.

[0050] The rotation of shaft 221 is achieved by displacement conversion through cam 240 fixedly connected to it. When cam 240 rotates, the inclined convex surface 241 of its outer surface slides against the contact surface of the bottom end of clamping rod 230, causing clamping rod 230 to deflect around the bottom axis, thereby causing the clamps 231 on both sides to close towards the center, clamping and positioning the edge of the circuit board.

[0051] During clamping, the flexible pad 232 on the surface of the chuck 231 contacts the side of the circuit board. The flexible pad 232 has a built-in highly elastic silicone layer, which can adaptively compensate for minor unevenness on the surface of the circuit board, achieving flexible clamping and preventing board warping or cracking caused by local stress during soldering. At the same time, the abutment 233 on the outer side of the middle of the clamping rod 230 and the inclined convex surface 241 of the cam 240 form a limiting stroke, controlling the range of clamping force and ensuring that a constant clamping pressure is maintained for circuit boards of different specifications.

[0052] After clamping is complete, the thermally conductive tray 250 activates its thermal control function. The thermally conductive tray 250 forms a composite heat dissipation structure through its internal cooling coil 251 and composite liquid metal thermal pad 252. Coolant flows through the cooling coil 251, which can quickly remove the welding heat; the liquid metal thermal pad 252 directly contacts the bottom of the circuit board, realizing a high thermal conductivity transfer path, so that the solder joint temperature quickly stabilizes within the predetermined range, thereby effectively preventing the solder pad from overheating and deforming or causing cold solder joints.

[0053] After welding is completed, the worm gear drive assembly 220 rotates in the opposite direction, the cam 240 resets accordingly, the clamp 230 opens, and the chuck 231 releases the circuit board, completing the automatic unclamping.

[0054] In the circuit board transport process, the conveyor assembly 300 plays a crucial role. The belt 320 mounted on the conveyor base 310 is driven by the drive motor 312 in a cyclical motion. The drive motor 312 adopts a servo motor structure, which can adjust the belt speed according to the process cycle to achieve continuous transport synchronized with the welding cycle. Material sensors 330 installed at both ends of the conveyor base 310 detect the circuit board's positioning status in real time. When the circuit board is detected to have entered the positioning area, the multi-axis welding machine 120 is automatically triggered to start the welding program, achieving automated control.

[0055] During operation, the vibration isolation cavity inside the welding machine 100 absorbs the mechanical vibration generated by the multi-axis welding machine 120, ensuring that the clamping posture of each positioning component 200 and the position of the welding point remain accurate and stable. The anti-splatter nano-coating on the surface of the heat-conducting tray 250 prevents solder residue from adhering and affecting heat dissipation performance, maintaining a long-term efficient heat conduction effect.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A circuit board welding positioning fixture, characterized in that, The assembly includes a welding machine (100), a positioning component (200), and a conveying component (300), as well as a top cylinder (110) and a multi-axis welding machine (120) fixedly installed on the surface of the welding machine (100). The positioning component (200) is fixed to the top of the top cylinder (110) and is used for lifting control. The number of positioning components (200) is several, and they are arranged in a straight line along the surface of the welding machine (100) to form a multi-station assembly. The positioning assembly (200) includes a clamp (210), a worm gear drive assembly (220), a clamp (230), a cam (240), and a heat-conducting support plate (250); a support plate (211) is fixedly mounted on the surface of the clamp (210); the clamp (230) is symmetrically arranged, and its bottom end is rotatably mounted on the surface of the clamp (210); the worm gear drive assembly (220) is fixed to the surface of the clamp (210), and its output end is provided with a shaft (221); the cam (240) is... 0) The cam (240) is fixedly sleeved on the surface of the shaft (221), and the surface of the cam (240) is provided with a convex surface (241) and is located on one side of the clamping rod (230) for sliding contact with the surface of the clamping rod (230) to achieve clamping action; the heat-conducting plate (250) is fixedly installed on the top surface of the support (211), and the heat-conducting plate (250) is provided with a cooling coil (251) and a composite liquid metal heat-conducting pad (252) inside for rapid heat dissipation of the circuit board during welding; The conveying assembly (300) includes a conveyor seat (310), a belt (320) and a material sensor (330). A drive motor (312) is fixedly installed on the surface of the conveyor seat (310) to drive the belt (320) to rotate, so as to realize the linear conveying of the circuit board. A chuck (231) is provided on one side of the clamping rod (230), and the inclined convex surface (241) of the cam (240) forms a sliding contact with the surface of the chuck (231) so as to realize the automatic opening and closing positioning of the clamping rod (230) through deflection motion; The surface of the clamp (231) is rotatably mounted with a flexible pad (232). The flexible pad (232) has an arc-shaped structure and its inner layer is made of a highly elastic silicone pad, which is used to form an adaptive pressure surface when it is clamped and in contact with the edge of the circuit board.

2. The circuit board welding positioning fixture according to claim 1, characterized in that: The bottom surface of the support (211) is provided with a bushing seat, and the shaft (221) is rotatably sleeved on the inner side of the bushing seat; the surface of the clamping rod (230) is provided with a through hole, the shaft (221) passes through the clamping rod (230) and is fixedly connected to the surface of the cam (240), so as to drive the cam (240) to deflect through the rotation of the worm gear drive assembly (220) to realize the change of clamping position.

3. The circuit board welding positioning fixture according to claim 1, characterized in that: The outer surface of the middle part of the clamp (230) is provided with a stop bar (233) to increase the swing amplitude of the clamp (230) and cooperate with the inclined convex surface (241) of the cam (240) to form a limit stroke control.

4. The circuit board welding positioning fixture according to claim 1, characterized in that: The cooling coil (251) inside the heat-conducting plate (250) and the composite liquid metal heat-conducting patch (252) adopt an integral pressing and molding structure. The cooling coil (251) can be circulated with coolant to achieve localized and efficient heat conduction and cooling in the welding area.

5. The circuit board welding positioning fixture according to claim 1, characterized in that: The material sensor (330) is disposed on the surface of the conveyor seat (310) to detect the circuit board arrival signal and is electrically connected to the multi-axis welding machine (120) to realize automatic synchronous start of the welding program.

6. The circuit board welding positioning fixture according to claim 1, characterized in that: The drive motor (312) is a servo motor structure, and its output shaft is connected to the belt (320) through a coupling to realize adjustable control of the conveying speed to adapt to the welding rhythm of different specifications of circuit boards.

7. The circuit board welding positioning fixture according to claim 1, characterized in that: The welding machine (100) adopts a double-layer steel structure support body and is equipped with a vibration isolation cavity inside to reduce the impact of mechanical vibration on positioning accuracy during the operation of the multi-axis welding machine (120).

8. The circuit board welding positioning fixture according to claim 1, characterized in that: The surface of the heat-conducting tray (250) is covered with an anti-splatter nano-coating to prevent solder residue from degrading the thermal conductivity.

Images