Clamp for laser welding of power-assisted bicycle battery box and fixing method of clamp

Abstract

The invention relates to the technical field of welding clamps, in particular to a clamp for laser welding of a power-assisted bicycle battery box and a fixing method thereof, and the clamp comprises a base mechanism, a driving motor, a moving assembly, a fixing mechanism, a limiting mechanism and a clamping mechanism; the driving motor is installed on the side face of the base mechanism, the moving assembly is installed in the base mechanism, the two fixing mechanisms are installed on the base mechanism in a mirror image mode, one fixing mechanism is fixedly installed, the limiting mechanism is installed in the fixing mechanisms, and the other fixing mechanism is fixedly installed in the base mechanism. The clamping mechanism is installed on the side face of the fixing mechanism. A workpiece is placed on the clamping mechanism, the clamping plate moves to the vertical direction to be limited, a control assembly in the limiting mechanism drives a telescopic assembly to fix the clamping plate, and a driving motor drives a screw rod in the base mechanism to rotate, so that the distance between the two fixing mechanisms is adjusted, and the workpiece is clamped and fixed.

Description

Technical Field

[0001] The invention relates to the technical field of welding fixtures, and in particular to a fixture for laser welding of a battery box of a power-assisted bicycle and a fixing method thereof. Background Art

[0002] The reason why laser welding is used in the battery box of power-assisted bicycles is that its technical characteristics can well meet the requirements of battery boxes in structure, performance and production. The main reasons include the following: Precise control: The laser welding spot is small and the heat-affected zone is narrow, which can achieve precise connection, and is very suitable for the complex structure and fine weld requirements of the battery box. Strong welding: The weld formed by laser welding has high strength and can withstand the vibration, impact and fatigue load caused by long-term use of the battery box. Small heat input: The heat of laser welding is concentrated, and it will not cause excessive thermal damage to the battery core or other sensitive components inside the battery box, protecting the battery performance. Reduce deformation: Compared with traditional welding methods (such as resistance welding or argon arc welding), laser welding can effectively avoid the deformation of materials caused by high temperature. Battery boxes are usually made of aluminum alloy or stainless steel. These metals may not be friendly to traditional welding methods, while laser welding performs well on highly reflective materials (such as aluminum alloy) and can achieve efficient welding of dissimilar metals.

[0003] During the laser welding process, fixture fixation is essential, especially for precision parts such as the battery box of power-assisted bicycles. The role of the fixture is to ensure accurate welding position, stable welding quality, and improve production efficiency. The welding area of ​​the battery box is usually small, and laser welding requires very precise weld position. The fixture can effectively ensure that the position of the welded workpiece remains consistent. Even a deviation of millimeters may affect the welding quality, especially when it comes to sealing welding. Although the heat-affected zone of laser welding is small, local heating can still cause thermal expansion and deformation of the material. The fixture can fix the workpiece to prevent weld offset or poor connection due to thermal deformation.

[0004] The existing laser welding fixture for power-assisted bicycle battery boxes is relatively simple and has a poor fixing effect, which is not conducive to improving the accuracy and good rate of laser welding. In addition, the fixture is relatively single and cannot meet the adaptive adjustment and fixation of power-assisted bicycle battery boxes of various specifications and sizes. As a result, if there is a deviation in the manufacturing of the power-assisted bicycle battery box, it is easy to cause the laser welding fixture for the power-assisted bicycle battery box to be unusable, and manual welding is required.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a fixture for laser welding of a power-assisted bicycle battery box and a fixing method thereof, which solves the above technical problems. Summary of the invention

[0006] The technical purpose to be achieved by the present invention is to design a fixture for laser welding of a power-assisted bicycle battery box and a fixing method thereof, thereby improving the fixing stability, thereby improving the welding accuracy, and adapting to the size of the battery box, thereby improving the versatility and the popularity of mechanized welding.

[0007] In order to achieve the above technical objectives, the present invention provides the following technical solutions:

[0008] A fixture for laser welding of a battery box of a power-assisted bicycle comprises a base mechanism, a drive motor, a moving assembly, a fixing mechanism, a limiting mechanism and a clamping mechanism; the fixture has a reasonable structural design and clear functions, and can effectively meet the requirements of accurate positioning, stable clamping and flexible adjustment of workpieces during the laser welding of the battery box.

[0009] The base mechanism is arranged on the welding workbench as the bearing platform and supporting structure of the entire fixture. Its design ensures the stability of the fixture during welding operation. The driving motor is installed on the side of the base mechanism, and the motor drive provides the power source for the mechanical parts in the fixture to ensure efficient and reliable operation. The moving component is installed inside the base mechanism to control the movement and position adjustment of the relevant parts in the fixture, giving the fixture higher adaptability and flexibility.

[0010] The fixture has two fixing mechanisms, which are symmetrically installed on both sides of the base mechanism in a mirror-image manner. Among them, one fixing mechanism is fixedly installed to provide a stable support point, and the other fixing mechanism can be moved by the action of the driving motor to achieve flexible clamping and adjustment of the workpiece to meet the welding requirements of battery boxes of different sizes. A limiting mechanism is set inside the fixing mechanism. The limiting mechanism drives the telescopic component inside it to operate through the control component to effectively limit and fix the clamping plate in the clamping mechanism. The clamping mechanism is installed on the side of the fixing mechanism, and its structure includes a clamping plate for direct contact with the workpiece. The clamping plate can move flexibly during the operation of the fixture and adjust to the vertical direction to stably limit the workpiece.

[0011] When the workpiece is placed on the clamping mechanism, the clamping plate moves to the vertical direction, and the control component in the limit mechanism drives the telescopic component to complete the fixing operation of the clamping plate. Subsequently, the drive motor starts, driving the screw rod in the base mechanism to rotate. The screw rod adjusts the distance between the two fixing mechanisms by rotation, achieving precise clamping and firm fixation of the workpiece. Through this series of actions, the fixture can quickly and efficiently complete the clamping of the workpiece, ensuring the accurate positioning of the workpiece and the consistency of the welding quality during the battery box welding process, while meeting the needs of mass production.

[0012] The design of the base mechanism includes a base block, a limit rod, a spiral rod and a moving groove to ensure the stability and adjustability of the entire fixture system. The base block adopts a hollow structure, and its interior provides space for the installation and operation of various mechanical components, and effectively reduces the weight of the structure, which is convenient for the installation and movement of the equipment. The limit rod and the spiral rod are installed in parallel inside the base block, wherein the limit rod is used to provide trajectory guidance for the mobile component to ensure the stability and accuracy of the operation of the mobile component. One end of the spiral rod is connected to the drive motor, and the rotation of the spiral rod is achieved by the rotation of the drive motor, thereby driving the displacement adjustment of the fixing mechanism. A moving groove is opened on the upper part of the base block, which provides a channel for the movement of the mobile component and facilitates the rapid positioning and clamping of the workpiece. This design is not only compact in structure, but also effectively meets the requirements of the welding fixture for flexibility and high precision.

[0013] The design of the moving assembly includes a moving block, a limiting hole, a spiral hole and a connecting protrusion, which is intended to achieve precise adjustment of the position of the workpiece in the fixture. The moving block is installed inside the base mechanism and is the core part of the entire moving assembly, responsible for smooth sliding along the track provided by the base mechanism. A limiting hole is set on the side of the moving block. By working with the limiting rod, it can effectively prevent the moving block from offsetting during movement, ensuring the smoothness and accuracy of the operation. A spiral hole is opened in the middle of the moving block, which is connected to the spiral rod in the base mechanism. Through the rotation of the spiral rod, the moving block is driven to move in a predetermined direction to achieve the adjustment of the clamping position of the workpiece. The connecting protrusion is located above the moving block and is used to connect with the clamping mechanism or the fixing mechanism, providing reliable support and linkage effect for the overall function of the fixture. This structure is compact and reasonable, and can meet the dual requirements of precision and stability in complex processes.

[0014] The structural design of the fixing mechanism includes a fixed bottom plate, a fixed vertical plate, a limit groove, a support spring and a rotation hole. Each component cooperates closely to achieve a stable clamping of the workpiece. The fixed bottom plate is the bottom support structure of the fixing mechanism. Its setting provides a stable foundation for the entire mechanism and is reliably connected to the base mechanism to ensure the stability and seismic resistance of the fixing mechanism during operation. The fixed vertical plate is installed above the fixed bottom plate and is a key component for clamping the workpiece. Its structural design enables it to be perpendicular to the fixed bottom plate and provide a strong support effect. The inner side of the fixed vertical plate is provided with a limit groove to limit the range of motion of the clamping mechanism, ensure the precise positioning of the clamping plate or related components during operation, and avoid deviation. The support spring is arranged between the two fixed vertical plates, which can provide elastic support, enhance the stability of the clamping mechanism, and adapt to the clamping requirements of workpieces of different sizes. A rotation hole is also provided at the upper end of the inner side of the fixed vertical plate to provide a rotation axis for linkage with the limit mechanism or other components, further enhancing the flexibility and functionality of the fixing mechanism. This design effectively ensures the accuracy and reliability of clamping.

[0015] The control assembly consists of a control rod, a control block and a sliding bevel block, and is an important part for achieving precise operation and flexible adjustment of the fixture. The control rod is installed inside the fixed base plate and serves as the core support component of the control assembly, responsible for carrying and driving other components to operate. The control block is fixed to the side of the control rod. As a key node for connection and transmission, it can efficiently transmit the movement of the control rod to the sliding bevel block to achieve the linkage of the entire mechanism. The sliding bevel block is installed above the control rod and arranged in a linear array to ensure that the control assembly moves smoothly during operation and is suitable for a variety of adjustment needs.

[0016] The cross section of the sliding bevel is designed as a right triangle, in which the inclined surface corresponding to the hypotenuse is provided with a sliding groove to guide the component to slide in a specific direction and improve the control accuracy. The top of the sliding bevel is designed with an arc-shaped stabilizing groove, and its arc-shaped structure can effectively enhance the stability of the component during operation and prevent vibration or offset from affecting the system.

[0017] The telescopic assembly includes a telescopic block and a sliding roller; the telescopic block is vertically installed in a fixed base plate, the telescopic block is used to move upward so as to be engaged in a fixed groove to fix the clamping plate, and the sliding roller is installed under the telescopic block, and the sliding roller is used to roll and rise under the drive of the control assembly.

[0018] The clamping mechanism is composed of a clamping plate, a connecting plate, a fixed clamping plate, a fixed back plate, a limit block and a rotating pin, and is the core structure of the fixture that directly contacts and fixes the workpiece. The clamping plate is installed inside the fixing mechanism, and its shape is designed to be L-shaped. This structure facilitates multi-angle support for the workpiece and enhances the stability and adaptability of the clamping. A connecting plate is installed above the clamping plate. The connecting plate is in a bent shape. Its design can not only improve the connection strength between the clamping plate and other components, but also adapt to workpieces of different sizes and shapes.

[0019] The fixed clamping plate is installed on the side of the connecting plate to directly apply clamping force to the workpiece to ensure that the workpiece will not move or loosen during welding. The fixed back plate is located on the back of the clamping plate. As a supporting component of the overall structure, it can enhance the rigidity and stability of the clamping mechanism. Limiting blocks are installed on both sides of the fixed back plate to further limit the movement range of the workpiece and ensure the clamping accuracy. The rotating pins are installed on both sides of the fixed back plate. The flexible adjustment of the clamping mechanism is achieved through the rotating pins, which is convenient for quick clamping and releasing of the workpiece. The overall design is compact and reasonable, suitable for high-efficiency and high-precision operation requirements.

[0020] A positioning groove and a fixing groove are designed below the clamping plate to ensure accurate positioning and firm fixation of the workpiece. The cross-sectional shape of the positioning groove is set to a trapezoid. This design can effectively limit the movement of the workpiece and provide higher stability. The fixing groove is located above the positioning groove and is used in conjunction with the positioning groove to further enhance the clamping effect and ensure that the position of the workpiece does not shift during the welding process. This design not only improves the clamping accuracy, but also adapts to the clamping requirements of workpieces of different shapes, and is an important part of the fixture function.

[0021] The side of the fixed clamp is designed with multiple mounting holes, which are used to install reset springs. The reset springs are used to ensure that the clamping plate can automatically return to its original position after clamping, thereby improving operating efficiency. A clamping suction cup is provided at the outer end of each reset spring. The suction cup can absorb the workpiece through negative pressure, enhance the clamping force, and prevent the workpiece from loosening or shifting during the clamping process. This design enables the clamping plate to respond quickly and flexibly adapt to the clamping requirements of different workpieces, thereby ensuring stability and precision during the welding process.

[0022] A method for fixing a fixture for laser welding of a battery box of a power-assisted bicycle, the method is used to cooperate with the above-mentioned fixture for laser welding of a battery box of a power-assisted bicycle; the steps of the method are as follows:

[0023] S1: The staff or manipulator moves the power-assisted bicycle battery box to the middle of the clamping mechanism and places it downward. During this process, the power-assisted bicycle battery box drives the clamping plate to overcome the elastic force of the supporting spring, so that the clamping plate is in a vertical state;

[0024] S2: Pull the control assembly so that the control rod drives the sliding inclined block to slide, so that the telescopic block moves to the highest point driven by the rolling pulley, and then is clamped in the fixing groove to complete the fixing of the clamping plate;

[0025] S3: driving the driving motor, the driving motor drives the spiral rod to rotate, and since the moving block is limited by the limiting rod, the moving block can only move horizontally in the base mechanism, and the connecting protrusion drives the movable fixed mechanism to approach the fixed mechanism on the other side;

[0026] S4: When the clamping plates on both sides of the power-assisted bicycle battery box completely fix it, the drive motor stops moving and the laser welding work is started.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) The present invention realizes the rapid clamping of the power-assisted bicycle battery box by setting a clamping mechanism, and can quickly complete the clamping of the power-assisted bicycle battery box. This greatly reduces the operation time and improves the work efficiency, especially in the production process, it can realize efficient and rapid workpiece clamping, thereby meeting the needs of large-scale production. The limit mechanism fixes the clamping mechanism to ensure that the workpiece will not be displaced or loosened after clamping. The fixed limit effectively avoids the workpiece from being offset during the welding process, ensures the accuracy and consistency of the welding position, and thus improves the welding quality.

[0029] (2) The adaptive adjustment function of the moving component enables the fixture to be flexibly adjusted according to battery boxes of different specifications. This adjustment capability not only improves the versatility of the fixture, but also adapts to the clamping needs of a variety of workpieces, reducing the adjustment trouble caused by different workpiece sizes. Through the cooperation of adaptive adjustment and limit mechanisms, the clamping mechanism can maintain fixed stability under various working conditions. This is crucial for welding accuracy. Stable clamping can effectively reduce welding defects caused by vibration, deformation or improper clamping. The stability and accuracy of clamping are key factors in ensuring welding quality. Through the optimization of these designs, the workpiece position during welding is more accurate, the weld is more consistent, and the welding quality is significantly improved, thereby avoiding welding problems caused by improper clamping.

[0030] (3) The present invention can be widely used in battery boxes of different sizes and shapes through the combination of adaptive adjustment, stable clamping and limit functions, effectively improving its versatility. In addition, the automated design of the overall structure makes the fixture suitable for use with mechanized welding equipment, promoting the mechanization and automation of the welding process, improving production efficiency and consistency, reducing manual operation errors, and promoting the popularization and upgrading of welding technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the base mechanism of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the mobile assembly of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the fixing mechanism and the limiting mechanism of the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of the control component of the present invention;

[0038] Figure 6 It is a schematic diagram of the structure of the telescopic assembly of the present invention;

[0039] Figure 7 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0040] Figure 8 It is a cross-sectional view of the clamping structure of the present invention.

[0041] In the figure: 1, base mechanism; 11, base block; 12, limit rod; 13, spiral rod; 14, moving groove; 2, drive motor; 3, moving assembly; 31, moving block; 32, limit hole; 33, spiral hole; 34, connecting protrusion; 4, fixing mechanism; 41, fixed bottom plate; 42, fixed vertical plate; 43, limit groove; 44, support spring; 45, rotating hole; 5, limit mechanism; 51, control assembly; 511, control rod; 5 12. Control block; 513. Sliding inclined block; 514. Sliding groove; 515. Stabilizing groove; 52. Telescopic assembly; 521. Telescopic block; 522. Sliding roller; 6. Clamping mechanism; 61. Clamping plate; 611. Positioning groove; 612. Fixed groove; 62. Connecting plate; 63. Fixed splint; 631. Mounting hole; 632. Reset spring; 633. Clamping suction cup; 64. Fixed back plate; 65. Limit block; 66. Rotating pin. DETAILED DESCRIPTION

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figure 1-8 As shown, a fixture for laser welding of a battery box of an assisted bicycle comprises a base mechanism 1, a drive motor 2, a moving assembly 3, a fixing mechanism 4, a limiting mechanism 5 and a clamping mechanism 6; it has a reasonable structural design and clear functions, and can effectively meet the requirements of precise positioning, firm clamping and flexible adjustment of the workpiece during the laser welding of the battery box.

[0044] The base mechanism 1 is arranged on the welding workbench as the bearing platform and supporting structure of the entire fixture. Its design ensures the stability of the fixture during welding operation. The drive motor 2 is installed on the side of the base mechanism 1, and the motor drive provides a power source for the mechanical parts in the fixture to ensure efficient and reliable operation. The moving component 3 is installed inside the base mechanism 1 to control the movement and position adjustment of related parts in the fixture, giving the fixture higher adaptability and flexibility.

[0045] The fixture has two fixing mechanisms 4, which are symmetrically installed on both sides of the base mechanism 1 in a mirror-image manner. Among them, one fixing mechanism 4 is fixedly installed to provide a stable support point, and the other fixing mechanism 4 is movable through the action of the driving motor 2 to achieve flexible clamping and adjustment of the workpiece to meet the welding requirements of battery boxes of different sizes. A limiting mechanism 5 is arranged inside the fixing mechanism 4. The limiting mechanism 5 drives the telescopic component 52 inside it to operate through the control component 51, and effectively limits and fixes the clamping plate 61 in the clamping mechanism 6. The clamping mechanism 6 is installed on the side of the fixing mechanism 4, and its structure includes a clamping plate 61 for directly contacting the workpiece. The clamping plate 61 can move flexibly during the operation of the fixture and be adjusted to the vertical direction to stably limit the workpiece.

[0046] When the workpiece is placed on the clamping mechanism 6, the clamping plate 61 moves to the vertical direction, and the control component 51 in the limit mechanism 5 drives the telescopic component 52 to complete the fixing operation of the clamping plate 61. Subsequently, the drive motor 2 is started to drive the screw rod 13 in the base mechanism 1 to rotate. The screw rod 13 adjusts the distance between the two fixing mechanisms 4 by rotation to achieve accurate clamping and firm fixation of the workpiece. Through this series of actions, the fixture can quickly and efficiently complete the clamping of the workpiece, ensure the accurate positioning of the workpiece and the consistency of the welding quality during the battery box welding process, and meet the needs of mass production.

[0047] like Figure 2As shown, the design of the base mechanism 1 includes a base block 11, a limit rod 12, a spiral rod 13 and a movable groove 14 to ensure the stability and adjustability of the entire fixture system. The base block 11 adopts a hollow structure, and its interior provides space for the installation and operation of various mechanical components, and effectively reduces the weight of the structure, which is convenient for the installation and movement of the equipment. The limit rod 12 and the spiral rod 13 are installed in parallel inside the base block 11, wherein the limit rod 12 is used to provide trajectory guidance for the mobile component 3 to ensure the stability and accuracy of the operation of the mobile component 3. One end of the spiral rod 13 is connected to the drive motor 2, and the rotation of the spiral rod 13 is realized by the rotation of the drive motor 2, thereby driving the displacement adjustment of the fixing mechanism 4. A movable groove 14 is opened on the upper part of the base block 11, and the movable groove 14 provides a channel for the movement of the mobile component 3, and is convenient for the rapid positioning and clamping of the workpiece. This design is not only compact in structure, but also can effectively meet the requirements of the welding fixture for flexibility and high precision.

[0048] like Figure 3 As shown, the design of the moving assembly 3 includes a moving block 31, a limiting hole 32, a spiral hole 33 and a connecting protrusion 34, which is intended to achieve precise adjustment of the position of the workpiece in the fixture. The moving block 31 is installed inside the base mechanism 1 and is the core part of the entire moving assembly 3, responsible for smooth sliding along the track provided by the base mechanism 1. The side of the moving block 31 is provided with a limiting hole 32, which can effectively prevent the moving block 31 from offsetting during movement by working with the limiting rod 12, thereby ensuring the smoothness and accuracy of the operation. A spiral hole 33 is provided in the middle of the moving block 31, and the spiral hole 33 is connected to the spiral rod 13 in the base mechanism 1. Through the rotation of the spiral rod 13, the moving block 31 is driven to move in a predetermined direction to achieve the adjustment of the clamping position of the workpiece. The connecting protrusion 34 is located above the moving block 31 and is used to connect with the clamping mechanism 6 or the fixing mechanism 4, providing reliable support and linkage effect for the overall function of the fixture. This structure is compact and reasonable, and can meet the dual requirements of precision and stability in complex processes.

[0049] like Figure 4As shown, the structural design of the fixing mechanism 4 includes a fixed bottom plate 41, a fixed vertical plate 42, a limiting groove 43, a support spring 44 and a rotating hole 45. Each component cooperates closely to achieve a stable clamping of the workpiece. The fixed bottom plate 41 is the bottom support structure of the fixing mechanism 4. Its setting provides a stable foundation for the entire mechanism and is reliably connected to the base mechanism 1 to ensure the stability and seismic resistance of the fixing mechanism 4 during operation. The fixed vertical plate 42 is installed above the fixed bottom plate 41 and is a key component for clamping the workpiece. Its structural design enables it to be perpendicular to the fixed bottom plate 41 and provide a strong support effect. The inner side surface of the fixed vertical plate 42 is provided with a limiting groove 43, which is used to limit the range of motion of the clamping mechanism 6, to ensure the precise positioning of the clamping plate 61 or related components during operation, and to avoid deviation. The support spring 44 is arranged between the two fixed vertical plates 42, which can provide elastic support, enhance the stability of the clamping mechanism 6, and adapt to the clamping requirements of workpieces of different sizes. A rotation hole 45 is also provided at the upper end of the inner side surface of the fixed vertical plate 42, which provides a rotation axis for linkage with the limiting mechanism 5 or other components, further enhancing the flexibility and functionality of the fixing mechanism 4. This design effectively ensures the accuracy and reliability of clamping.

[0050] like Figure 5 As shown, the control assembly 51 is composed of a control rod 511, a control block 512 and a sliding bevel block 513, which is an important part for realizing precise operation and flexible adjustment of the clamp. The control rod 511 is installed inside the fixed base plate 41, and as the core supporting component of the control assembly 51, it is responsible for carrying and driving other components to operate. The control block 512 is fixed to the side of the control rod 511, and as a key node for connection and transmission, it can efficiently transmit the movement of the control rod 511 to the sliding bevel block 513 to realize the linkage of the overall mechanism. The sliding bevel block 513 is installed above the control rod 511 and arranged in a linear array to ensure that the control assembly 51 moves smoothly during operation and is suitable for a variety of adjustment needs.

[0051] The cross section of the sliding bevel block 513 is designed as a right triangle, wherein the bevel corresponding to the hypotenuse is provided with a sliding groove 514, which is used to guide the component to slide in a specific direction to improve the control accuracy. The top of the sliding bevel block 513 is designed with an arc-shaped stabilizing groove 515, whose arc-shaped structure can effectively enhance the stability of the component during operation and prevent vibration or offset from affecting the system.

[0052] like Figure 6 As shown, the telescopic assembly 52 includes a telescopic block 521 and a sliding roller 522; the telescopic block 521 is vertically installed in the fixed base plate 41, the telescopic block 521 is used to move upward so as to be engaged in the fixed groove 612 to fix the clamping plate 61, and the sliding roller 522 is installed under the telescopic block 521, and the sliding roller 522 is used to roll under the drive of the control assembly 51 to rise.

[0053] like Figure 7 As shown, the clamping mechanism 6 is composed of a clamping plate 61, a connecting plate 62, a fixed clamping plate 63, a fixed back plate 64, a limit block 65 and a rotating pin 66, and is the core structure of the fixture that directly contacts and fixes the workpiece. The clamping plate 61 is installed inside the fixing mechanism 4, and its shape is designed to be L-shaped. This structure is convenient for multi-angle support of the workpiece, and at the same time enhances the stability and adaptability of the clamping. A connecting plate 62 is installed above the clamping plate 61. The shape of the connecting plate 62 is bent. Its design can not only improve the connection strength between the clamping plate 61 and other components, but also adapt to workpieces of different sizes and shapes.

[0054] The fixed clamping plate 63 is installed on the side of the connecting plate 62, and is used to directly apply clamping force to the workpiece to ensure that the workpiece will not be displaced or loosened during the welding process. The fixed back plate 64 is located on the back of the clamping plate 61. As a supporting component of the overall structure, it can enhance the rigidity and stability of the clamping mechanism 6. Limiting blocks 65 are installed on both sides of the fixed back plate 64 to further limit the movement range of the workpiece and ensure the clamping accuracy. The rotating pins 66 are installed on the two sides of the fixed back plate 64. The flexible adjustment of the clamping mechanism 6 is achieved through the rotating pins 66, which is convenient for quick clamping and releasing of the workpiece. The overall design is compact and reasonable, suitable for high-efficiency and high-precision operation requirements.

[0055] like Figure 8 As shown, a positioning groove 611 and a fixing groove 612 are designed below the clamping plate 61 to ensure accurate positioning and firm fixation of the workpiece. The cross-sectional shape of the positioning groove 611 is set to a trapezoid. This design can effectively limit the movement of the workpiece and provide higher stability. The fixing groove 612 is located above the positioning groove 611 and is used in conjunction with the positioning groove 611 to further enhance the clamping effect and ensure that the position of the workpiece does not shift during the welding process. This design not only improves the clamping accuracy, but also adapts to the clamping requirements of workpieces of different shapes, and is an important part of the fixture function.

[0056] The side of the fixed clamping plate 63 is designed with multiple mounting holes 631, which are used to install reset springs 632. The function of the reset springs 632 is to ensure that the clamping plate 61 can automatically return to its original position after clamping, thereby improving the operating efficiency. A clamping suction cup 633 is provided at the outer end of each reset spring 632. The suction cup can absorb the workpiece through negative pressure, enhance the clamping force, and prevent the workpiece from loosening or shifting during the clamping process. This design enables the clamping plate 61 to respond quickly and flexibly adapt to the clamping requirements of different workpieces, thereby ensuring stability and precision during the welding process.

[0057] A method for fixing a fixture for laser welding of a battery box of a power-assisted bicycle, the method is used to cooperate with the above-mentioned fixture for laser welding of a battery box of a power-assisted bicycle; the steps of the method are as follows:

[0058] S1: The staff or manipulator moves the power-assisted bicycle battery box to the middle of the clamping mechanism 6 and places it downward. During this process, the power-assisted bicycle battery box drives the clamping plate 61 to overcome the elastic force of the supporting spring 44, so that the clamping plate 61 is in a vertical state;

[0059] S2: Pull the control assembly 51, so that the control rod 511 drives the sliding inclined block 513 to slide, so that the telescopic block 521 moves to the highest point driven by the rolling pulley, and is engaged in the fixing groove 612, thereby completing the fixing of the clamping plate 61;

[0060] S3: driving the driving motor 2, the driving motor 2 drives the screw rod 13 to rotate, and since the moving block 31 is limited by the limiting rod 12, the moving block 31 can only move horizontally in the base mechanism 1, and the connecting protrusion 34 drives the movable fixed mechanism 4 to approach the fixed mechanism 4 on the other side;

[0061] S4: When the clamping plates 61 on both sides of the power-assisted bicycle battery box completely fix it, the driving motor 2 stops moving and the laser welding work is started.

[0062] During the working process of the present invention, during the welding process, the staff or the manipulator accurately moves the battery box of the power-assisted bicycle to the center of the clamping mechanism 6 and carefully places it downward. As the battery box is placed in the clamping mechanism 6, the gravity of the battery box causes the clamping plate 61 to overcome the elastic force of the support spring 44, thereby placing the clamping plate 61 in a vertical state. At this time, the clamping plate 61 maintains a certain stability through the elastic action of the spring, ensuring that the battery box is fixed in the clamping position to prevent it from being displaced during the subsequent welding process.

[0063] Then, the staff or the automated system pulls the control assembly 51, and the control rod 511 is linked with the sliding inclined block 513, driving the sliding inclined block 513 to slide along the set track. Through the movement of the sliding inclined block 513, the telescopic block 521 is driven, and guided by the rolling pulley, it gradually moves to the highest point and finally clamps in the fixing groove 612. This process ensures that the clamping plate 61 is firmly fixed in the predetermined position, avoiding looseness or deviation during the welding process, and providing precise clamping force.

[0064] Next, the driving motor 2 is started, driving the screw rod 13 in the base mechanism 1 to start rotating. Since the moving block 31 is limited by the limit rod 12, the moving block 31 can only move horizontally in the base mechanism 1, and cannot deviate up and down or left and right, thereby ensuring the stability of the clamping mechanism 6. The connecting protrusion 34 drives the movable fixed mechanism 4 to move closer to the other side through rotation transmission, so that the fixed mechanisms 4 on both sides gradually reduce the distance, ensuring that the clamping plate 61 completely clamps the two sides of the battery box. With the adjustment of the fixed mechanism 4, the two sides of the battery box are firmly clamped, ensuring that it is in a stable position during the entire welding process.

[0065] When the clamping plates 61 on both sides completely fix the battery box, the drive motor 2 stops moving, and the clamping mechanism 6 firmly maintains the clamping state of the battery box. At this time, the fixture has successfully completed the precise positioning and clamping of the battery box, and the subsequent laser welding operation can be carried out. During the welding process, since the battery box is accurately fixed and clamped stably, the position of the welding point can be accurately controlled and the welding quality can be guaranteed.

[0066] Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the widest scope consistent with the principles and novel features disclosed herein. Although one or more exemplary embodiments of the present disclosure have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined in the appended claims.

Claims

1. A fixture for laser welding of a power-assisted bicycle battery box, characterized in that: It comprises a base mechanism (1), a driving motor (2), a moving assembly (3), a fixing mechanism (4), a limiting mechanism (5) and a clamping mechanism (6); The base mechanism (1) is arranged on a welding workbench, the driving motor (2) is installed on the side of the base mechanism (1), the moving assembly (3) is installed inside the base mechanism (1), two fixing mechanisms (4) are provided, the two fixing mechanisms (4) are mirror-mounted on the base mechanism (1), one of the fixing mechanisms (4) is fixedly installed, the limiting mechanism (5) is installed inside the fixing mechanism (4), and the clamping mechanism (6) is installed on the side of the fixing mechanism (4); The workpiece is placed on the clamping mechanism (6), the clamping plate (61) moves to a vertical direction for limiting, the control component (51) in the limiting mechanism (5) drives the telescopic component (52) to fix the clamping plate (61), and the driving motor (2) drives the screw rod (13) in the base mechanism (1) to rotate, thereby adjusting the distance between the two fixing mechanisms (4) to achieve clamping and fixing of the workpiece.

2. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The base mechanism (1) comprises a base block (11), a limiting rod (12), a screw rod (13) and a moving groove (14); The interior of the base block (11) is configured as a hollow structure, the limiting rod (12) and the spiral rod (13) are installed in parallel inside the base block (11), one end of the spiral rod (13) is connected to the driving motor (2), and the movable groove (14) is provided on the top of the base block (11).

3. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The moving assembly (3) comprises a moving block (31), a limiting hole (32), a spiral hole (33) and a connecting protrusion (34); The moving block (31) is installed inside the base mechanism (1), the limiting hole (32) is opened on the side of the moving block (31), the spiral hole (33) is opened in the middle of the moving block (31), and the connecting protrusion (34) is arranged on the top of the moving block (31).

4. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The fixing mechanism (4) comprises a fixing bottom plate (41), a fixing vertical plate (42), a limiting groove (43), a supporting spring (44) and a rotating hole (45); The fixed bottom plate (41) is arranged as the lower part of the fixing mechanism (4), the fixed vertical plate (42) is installed on the fixed bottom plate (41), the limiting groove (43) is arranged on the inner side surface of the fixed vertical plate (42), the supporting spring (44) is installed in the middle of the two fixed vertical plates (42), and the rotating hole (45) is arranged on the upper end of the inner side surface of the fixed vertical plate (42).

5. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The control assembly (51) comprises a control rod (511), a control block (512) and a sliding inclined block (513); The control rod (511) is installed inside the fixed bottom plate (41), the control block (512) is installed on the side of the control rod (511), and the sliding inclined block (513) is installed on the top of the control rod (511), and the sliding inclined block (513) is arranged in a linear array; the cross section of the sliding inclined block (513) is arranged in a right triangle, and the inclined surface corresponding to the hypotenuse of the right triangle is provided with a sliding groove (514); the top of the sliding inclined block (513) is provided with a stabilizing groove (515), and the stabilizing groove (515) is arranged in an arc shape.

6. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The telescopic assembly (52) comprises a telescopic block (521) and a sliding roller (522); The telescopic block (521) is vertically installed in the fixed bottom plate (41), and the sliding roller (522) is installed below the telescopic block (521).

7. The laser welding fixture for a power-assisted bicycle battery box according to claim 1, characterized in that: The clamping mechanism (6) comprises a clamping plate (61), a connecting plate (62), a fixed clamping plate (63), a fixed back plate (64), a limit block (65) and a rotating pin (66); The clamping plate (61) is installed inside the fixing mechanism (4), the clamping plate (61) is set to be L-shaped, the connecting plate (62) is installed on the top of the clamping plate (61), the connecting plate (62) is set to be bent, the fixed clamping plate (63) is installed on the side of the connecting plate (62), the fixed back plate (64) is installed on the back of the clamping plate (61), the limit block (65) is installed on both sides of the fixed back plate (64), and the rotating pin (66) is installed on the two sides of the fixed back plate (64).

8. The laser welding fixture for a power-assisted bicycle battery box according to claim 7, characterized in that: A positioning groove (611) and a fixing groove (612) are provided on the bottom of the clamping plate (61); the cross-sectional shape of the positioning groove (611) is set to be a trapezoid, and the fixing groove (612) is located above the positioning groove (611).

9. The laser welding fixture for a power-assisted bicycle battery box according to claim 7, characterized in that: A plurality of mounting holes (631) are provided on the side of the fixing clamping plate (63), a return spring (632) is installed inside the mounting hole (631), and a clamping suction cup (633) is provided at the outer end of the return spring (632).

10. A method for fixing a fixture for laser welding of a battery box of a power-assisted bicycle, the method being used in conjunction with a fixture for laser welding of a battery box of a power-assisted bicycle as claimed in any one of claims 1 to 9; characterized in that: The steps of the method are as follows: S1: A staff member or a manipulator moves the battery box of the power-assisted bicycle to the middle of the clamping mechanism (6) and places it downward. During this process, the battery box of the power-assisted bicycle drives the clamping plate (61) to overcome the elastic force of the supporting spring (44), so that the clamping plate (61) is in a vertical state; S2: Pull the control assembly (51), so that the control rod (511) drives the sliding inclined block (513) to slide, so that the telescopic block (521) moves to the highest point under the drive of the rolling pulley, and is engaged in the fixing groove (612), thereby completing the fixing of the clamping plate (61); S3: driving the driving motor (2), the driving motor (2) drives the spiral rod (13) to rotate, and since the moving block (31) is limited by the limiting rod (12), the moving block (31) can only move horizontally in the base mechanism (1), and the connecting protrusion (34) drives the movably installed fixing mechanism (4) to approach the fixing mechanism (4) on the other side; S4: When the clamping plates (61) on both sides of the power-assisted bicycle battery box completely fix it, the driving motor (2) stops moving and the laser welding process starts.

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