A fool-proof laser welding fixture

Abstract

This utility model discloses a foolproof laser welding fixture, belonging to the field of laser welding. It includes a worktable assembly, a laser welding mechanism, a positioning foolproof mechanism, a clamping mechanism, and a control system. The positioning foolproof mechanism includes a positioning block and a photoelectric sensor. The positioning block has an installation area for placing the workpiece, and the photoelectric sensor is mounted on the positioning block. The clamping mechanism includes a push cylinder and two side clamping assemblies, which are positioned opposite each other on both sides of the positioning block. Each side clamping assembly includes a lifting cylinder, a clamping block, and a pressure sensor. The push cylinder is mounted on the worktable assembly and drives the two side clamping assemblies to move back and forth. The lifting cylinder drives the clamping block to move up and down to clamp the workpiece. The pressure sensor is mounted on the clamping block. The laser welding mechanism is mounted on the worktable assembly and located on one side of the installation area. This application achieves precise workpiece positioning, stable clamping, and intelligent control of the welding process, improving welding quality and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of laser welding, and in particular to a foolproof laser welding fixture. Background Technology

[0002] Laser welding is a high-precision, non-contact welding technology widely used in automotive manufacturing, electronic equipment, and other fields. During laser welding, precise workpiece positioning and stable clamping are crucial for ensuring weld quality. However, traditional laser welding fixtures have the following problems:

[0003] Clamping errors: When the workpiece has a complex shape or various sizes, manual clamping is prone to problems such as not being placed in place, missing parts, or being placed at the wrong time, which can lead to welding failure.

[0004] Uneven clamping force: Traditional clamping mechanisms cannot monitor clamping force in real time. Excessive clamping force may damage the workpiece, or insufficient clamping force may cause the workpiece to shift during welding.

[0005] Cumbersome operation: When welding multiple processes, the fixture parameters need to be adjusted frequently, which increases the difficulty of operation and time cost.

[0006] In existing technologies, some fixtures achieve certain error-proofing functions through mechanical structures or sensors, but these suffer from drawbacks such as complex structures, high costs, and narrow applicability. For example, patent CN202011353708.7 discloses an integrated infusion system, but does not address error-proofing design for laser welding fixtures; patent CN202320917262 proposes a multi-station error-proofing flipping fixture, but fails to solve the problems of clamping force monitoring and dynamic adjustment. Therefore, there is an urgent need for a laser welding fixture with a simple structure, high reliability, and multi-dimensional error-proofing capabilities. Utility Model Content

[0007] This invention overcomes the shortcomings of the prior art and provides a foolproof laser welding fixture. Through the coordinated action of the positioning foolproof mechanism, the clamping mechanism and the control system, it achieves precise positioning of the workpiece, stable clamping and intelligent control of the welding process, avoiding clamping errors and operational mistakes, and improving welding quality and efficiency.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a foolproof laser welding fixture, comprising a worktable assembly, a laser welding mechanism, a positioning foolproof mechanism, a clamping mechanism, and a control system. The positioning foolproof mechanism includes a positioning block and a photoelectric sensor. The positioning block is disposed on the worktable assembly and has an installation area for placing the workpiece. The photoelectric sensor is disposed on the positioning block for sensing whether the workpiece is placed in the correct position. The clamping mechanism includes a side clamping mechanism, which includes a push cylinder and two side clamping assemblies. The two side clamping assemblies are disposed opposite to each other on the worktable assembly. On both sides of the positioning block, the side clamping assembly includes a lifting cylinder, a clamping block, and a pressure sensor. The pushing cylinder is mounted on the worktable assembly and drives the two side clamping assemblies to move back and forth. The lifting cylinder drives the clamping block to move up and down to clamp the workpiece. The pressure sensor is mounted on the clamping block to sense the clamping force of the clamping block. The laser welding mechanism is mounted on the worktable assembly and located on one side of the installation area. The control system is communicatively connected to the photoelectric sensor, pressure sensor, pushing cylinder, lifting cylinder, and laser welding mechanism to receive sensor signals and control the actions of each actuator.

[0009] In a preferred embodiment of this utility model, the pushing cylinder is a first pushing cylinder, and the clamping mechanism further includes a front clamping mechanism. The front clamping mechanism is located on the side adjacent to the side clamping assembly and is opposite to the laser welding mechanism. The front clamping mechanism includes a second pushing cylinder and a clamping plate. The second pushing cylinder is disposed on the worktable assembly and is communicatively connected to the control system. The second pushing cylinder drives the clamping plate to move forward to clamp the front of the workpiece.

[0010] In a preferred embodiment of the present invention, the workbench assembly includes a base plate, a workbench, and two guide rails. The two guide rails are arranged parallel to each other on the base plate. The workbench is disposed on the base plate and located between the two guide rails. The positioning block is disposed on the workbench.

[0011] In a preferred embodiment of the present invention, the side clamping mechanism further includes a sliding plate and a slider. The slider is slidably mounted on the guide rail, and the sliding plate is fixedly connected to the slider. The side clamping assembly is disposed on the sliding plate. The first push cylinder drives the sliding plate and the side clamping assembly to move back and forth along the length direction of the guide rail to move closer to or away from the installation area.

[0012] In a preferred embodiment of this utility model, the lifting cylinder is a first lifting cylinder, and the laser welding mechanism includes a laser welding head and a second lifting cylinder. The second lifting cylinder is disposed on the slide plate, and the laser welding head faces the installation area. The second lifting cylinder drives the laser welding head to move up and down to perform laser welding on the workpiece.

[0013] In a preferred embodiment of this utility model, the foolproof laser welding fixture further includes an audible and visual alarm. The audible and visual alarm is installed on the workbench assembly and is communicatively connected to the control system. When it is detected that the workpiece is not placed in place or the clamping force is abnormal, the alarm is triggered.

[0014] In a preferred embodiment of this utility model, an elastic buffer layer is provided on the inner side of the clamping block, and the elastic buffer layer is made of rubber or silicone.

[0015] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0016] (1) This application achieves precise positioning, stable clamping and intelligent control of the welding process by means of the positioning error prevention mechanism, clamping mechanism and control system. It effectively solves the problems of clamping error, uneven clamping force and cumbersome operation of traditional laser welding fixtures, realizes the automation of the welding process and real-time response to abnormal situations, and improves welding quality and efficiency.

[0017] (2) This application adopts a modular design, with each component having a compact structure and being easy to maintain, reducing manufacturing costs and operational difficulties. It has the advantages of simple structure and high reliability, and can be widely used in laser welding processes in fields such as automobile manufacturing and electronic equipment.

[0018] (3) This application uses a front clamping mechanism to clamp the front of the workpiece and a side clamping mechanism to clamp the working side, so as to adapt to workpieces of different sizes, ensure effective clamping of the workpiece and subsequent laser welding quality, and has a wide range of applications. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0020] Figure 1 This is a schematic diagram of the structure of the foolproof laser welding fixture of this utility model;

[0021] Figure 2 yes Figure 1 A partial structural diagram of a foolproof laser welding fixture;

[0022] Figure 3 yes Figure 1 A schematic diagram of the foolproof laser welding fixture during operation.

[0023] In the diagram: 1. Workbench assembly; 11. Base plate; 12. Workbench; 13. Guide rail; 2. Positioning and error prevention mechanism; 21. Positioning block; 211. Mounting area; 22. Photoelectric sensor; 3. Clamping mechanism; 31. Front clamping mechanism; 311. Second push cylinder; 312. Clamping plate; 32. Side clamping mechanism; 321. First push cylinder; 322. Slider; 323. Slide plate; 324. Side clamping assembly; 3241. First lifting cylinder; 3242. Clamping block; 3243. Pressure sensor; 4. Laser welding mechanism; 41. Laser welding head; 42. Second lifting cylinder; 5. Audible and visual alarm; 6. Workpiece. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] like Figure 1-3 As shown, a foolproof laser welding fixture includes a worktable assembly 1, a positioning foolproof mechanism 2, a clamping mechanism 3, and a control system.

[0028] The workbench assembly 1 includes a base plate 11, a workbench 12, and two guide rails 13. The two guide rails 13 are arranged parallel to each other on the base plate 11, and the workbench 12 is arranged on the base plate 11 and located between the two guide rails 13.

[0029] The positioning and error prevention mechanism 2 is installed on the workbench 12, and specifically includes a positioning block 21 and a photoelectric sensor 22.

[0030] A positioning block 21 is mounted on the worktable 12. The positioning block 21 has an installation area 211 for placing the workpiece 6. A photoelectric sensor 22 is mounted on the positioning block 21 and is communicatively connected to the control system to sense whether the workpiece 6 is placed in the correct position. In this embodiment, the photoelectric sensor 22 is a diffuse reflection type. When the workpiece 6 is not placed in the correct position, is missing, or is placed incorrectly, the photoelectric sensor 22 cannot be blocked, triggering a signal to be transmitted to the control system. The laser welding mechanism 4 cannot start and an alarm is triggered.

[0031] The clamping mechanism 3 includes a front clamping mechanism 31 and a side clamping mechanism 32.

[0032] The front clamping mechanism 31 is located on one side of the installation area 211 and opposite to the laser welding mechanism 4. The front clamping mechanism 31 includes a second pushing cylinder 311 and a clamping plate 312. The second pushing cylinder 311 is mounted on the base plate 11 and is communicatively connected to the control system. The second pushing cylinder 311 drives the clamping plate 312 forward to clamp the front of the workpiece 6, accommodating workpieces 6 of different sizes. This application clamps the front of the workpiece 6 using the front clamping mechanism 31 and the working side using the side clamping mechanism 32, accommodating workpieces 6 of different sizes, ensuring effective clamping of the workpiece 6 and the subsequent laser welding quality, thus having a wide range of applications.

[0033] The side clamping mechanism 32 includes a first push cylinder 321, a slide plate 323, a slider 322, and two side clamping assemblies 324.

[0034] The first push cylinder 321 is mounted on the base plate 11, the slider 322 is slidably mounted on the guide rail 13, the slide plate 323 is fixedly connected to the slider 322, and the side clamping assembly 324 is mounted on the slide plate 323. The first push cylinder 321 drives the slide plate 323 and the two side clamping assemblies 324 to move back and forth along the length of the guide rail 13 to move closer to or away from the installation area 211.

[0035] Two side clamping assemblies 324 are disposed opposite each other on both sides of the positioning block 21. Each side clamping assembly 324 includes a first lifting cylinder 3241, a clamping block 3242, and a pressure sensor 3243. The first lifting cylinder 3241 drives the clamping block 3242 to move up and down to clamp the side of the workpiece 6. The pressure sensor 3243 is disposed on the clamping block 3242 and is communicatively connected to the control system to sense the clamping force of the clamping block 3242. In this embodiment, an elastic buffer layer is provided on the inner side of the clamping block 3242. The elastic buffer layer is made of rubber or silicone to reduce damage to the surface of the workpiece 6 during clamping.

[0036] The laser welding mechanism 4 includes a laser welding head 41 and a second lifting cylinder 42. The second lifting cylinder 42 is mounted on the slide plate 323. The laser welding head 41 faces the installation area 211. The second lifting cylinder 42 drives the laser welding head 41 to move up and down to perform laser welding on the workpiece 6. Specifically, after the control system confirms that the workpiece 6 is properly positioned and clamped, it starts the laser welding mechanism 4 to perform welding. Welding parameters (such as laser power and welding speed) can be preset through the human-machine interface.

[0037] The audible and visual alarm 5 is installed on the workbench 12 and is connected to the control system. When the workpiece 6 is not placed in place or the clamping force is abnormal, the alarm is triggered.

[0038] The control system is communicatively connected to photoelectric sensor 22, pressure sensor 3243, first push cylinder 321, second push cylinder 311, first lifting cylinder 3241, and laser welding mechanism 4, respectively, and is used to receive sensor signals and control the actions of each actuator.

[0039] The working process for this application is as follows:

[0040] Workpiece 6 positioning: The operator places workpiece 6 in the installation area 211 of positioning block 21. After the photoelectric sensor 22 detects that workpiece 6 is in place, it sends a signal to the control system.

[0041] Automatic clamping: The control system drives the second push cylinder 311 to move the clamping plate 312 forward to clamp the front of the workpiece 6, drives the first push cylinder 321 to move the side clamping assembly 324 towards the workpiece 6, and drives the first lifting cylinder 3241 to move the clamping block 3242 downward to clamp the side of the workpiece 6 until the pressure sensor 3243 detects the preset clamping force (e.g., 50N), and the control system controls the first lifting cylinder 3241 to stop operating.

[0042] Laser welding: After the control system confirms that the workpiece 6 is properly positioned and clamped, it starts the laser welding mechanism 4 to perform welding.

[0043] If the photoelectric sensor 22 fails to detect that the workpiece 6 is in place or the pressure sensor 3243 detects an abnormal clamping force (such as less than 30N or greater than 70N), the control system will immediately stop the operation of the laser welding mechanism 4 and trigger the audible and visual alarm 5 to prompt the operator to make adjustments.

[0044] This application achieves precise positioning, stable clamping, and intelligent control of the welding process of workpiece 6 through the coordinated action of positioning error prevention mechanism 2, clamping mechanism 3, and control system. It effectively solves the problems of clamping errors, uneven clamping force, and cumbersome operation that exist in traditional laser welding fixtures. It has the advantages of simple structure, high reliability, and wide applicability, and can be widely used in laser welding processes in automobile manufacturing, electronic equipment and other fields.

[0045] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A foolproof laser welding fixture, comprising a worktable assembly and a laser welding mechanism, characterized in that: It also includes a positioning and error prevention mechanism, a clamping mechanism, and a control system. The positioning and error prevention mechanism includes a positioning block and a photoelectric sensor. The positioning block is disposed on the worktable assembly and has an installation area for placing the workpiece. The photoelectric sensor is disposed on the positioning block and is used to sense whether the workpiece is placed in the correct position. The clamping mechanism includes a side clamping mechanism, which includes a push cylinder and two side clamping assemblies. The two side clamping assemblies are disposed opposite each other on both sides of the positioning block. Each side clamping assembly includes a lifting cylinder, a clamping block, and a pressure sensor. The push cylinder is disposed on the worktable assembly and drives the two side clamping assemblies to move back and forth. The lifting cylinder drives the clamping block to move up and down to clamp the workpiece. The pressure sensor is disposed on the clamping block and is used to sense the clamping force of the clamping block. The laser welding mechanism is disposed on the worktable assembly and located on one side of the installation area. The control system is communicatively connected to the photoelectric sensor, pressure sensor, push cylinder, lifting cylinder, and laser welding mechanism, respectively, and is used to receive sensor signals and control the actions of each actuator.

2. A fool-proof laser welding fixture according to claim 1, wherein: The pushing cylinder is a first pushing cylinder, and the clamping mechanism also includes a front clamping mechanism. The front clamping mechanism is located on the side adjacent to the side clamping assembly and is opposite to the laser welding mechanism. The front clamping mechanism includes a second pushing cylinder and a clamping plate. The second pushing cylinder is disposed on the worktable assembly and is communicatively connected to the control system. The second pushing cylinder drives the clamping plate to move forward to clamp the front of the workpiece.

3. A fool-proof laser welding fixture according to claim 2, wherein: The workbench assembly includes a base plate, a workbench, and two guide rails. The two guide rails are arranged parallel to each other on the base plate. The workbench is arranged on the base plate and located between the two guide rails. The positioning block is arranged on the workbench.

4. A fool-proof laser welding fixture according to claim 3, wherein: The side clamping mechanism also includes a slide plate and a slider. The slider is slidably mounted on the guide rail. The slide plate is fixedly connected to the slider. The side clamping assembly is disposed on the slide plate. The first push cylinder drives the slide plate and the side clamping assembly to move back and forth along the length of the guide rail to move closer to or away from the installation area.

5. A fool-proof laser welding fixture according to claim 4, wherein: The lifting cylinder is a first lifting cylinder, and the laser welding mechanism includes a laser welding head and a second lifting cylinder. The second lifting cylinder is mounted on the slide plate, and the laser welding head faces the installation area. The second lifting cylinder drives the laser welding head to move up and down to perform laser welding on the workpiece.

6. The fool-proof laser welding fixture of claim 1, wherein: The foolproof laser welding fixture also includes an audible and visual alarm, which is installed on the worktable assembly and communicates with the control system. When the workpiece is detected to be not in place or the clamping force is abnormal, the alarm is triggered.

7. The fool-proof laser welding fixture of claim 1, wherein: The inner side of the clamping block is provided with an elastic buffer layer, which is made of rubber or silicone.

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