Mechanical structure of stroke multiplication multi-position carrying machine vision camera and automatic welding gun

Abstract

The invention discloses a stroke-multiplied multi-position mechanical structure for carrying a machine vision camera and an automatic welding gun. The mechanical structure comprises a fixed bracket; the first sliding rail assembly is arranged on the fixed bracket; the movable support body is connected with the first sliding rail assembly; the second sliding rail assembly is arranged on the movable support body; the machine vision camera mounting bracket is arranged on the second sliding rail assembly and is used for mounting a machine vision camera; the driving assembly is arranged on the movable bracket body and is used for driving the movable bracket body to linearly move along the first sliding rail assembly and driving the machine vision camera mounting bracket to linearly move along the second sliding rail assembly; and the machine vision camera is driven to switch between a scanning position close to the gun neck end of the welding gun and an avoiding position far away from the gun neck end of the welding gun. Through ingenious mechanical design and automatic control, the inherent contradiction that an existing fixed camera installation mode cannot give consideration to scanning precision and equipment safety at the same time is successfully solved.

Description

Technical Field

[0001] This invention relates to the fields of automated welding and machine vision technology, specifically to a mechanical structure and an automatic welding torch with a machine vision camera mounted at a position that increases the stroke. Background Technology

[0002] In automated welding operations using machine vision, the first step is to use a camera to scan the workpiece to create a 3D model, which then guides the welding torch for precise welding. Currently, there are two main methods for installing machine vision cameras: Long-distance mounting: The camera is mounted on the flange end of the automatic welding torch. The advantage of this method is that the camera is far from the welding point, avoiding damage from welding spatter and dust, and it does not affect the range of motion of the welding torch. However, its fatal drawback is that the camera is far from the workpiece, resulting in low scanning accuracy and affecting modeling quality.

[0003] Close-range mounting: The camera is mounted on the neck of the automatic welding torch. The advantage of this method is that the camera is close to the workpiece, resulting in high scanning accuracy. However, the disadvantages are equally prominent: the camera is highly susceptible to interference with the workpiece or tooling, limiting the reach of the welding torch; simultaneously, the spatter and high-temperature dust generated during welding directly damage the camera, significantly shortening its lifespan.

[0004] Therefore, there is an urgent need in this field for a solution that combines the advantages of the two mounting methods mentioned above: enabling the camera to move to the neck end for high-precision scanning during scanning, and retracting to the flange end to avoid interference and protect the camera during welding. Existing fixed mounting structures cannot meet this requirement. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a mechanical structure and an automatic welding torch with a multiplied stroke position for mounting a machine vision camera, in order to overcome at least one related technical problem existing in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: According to one aspect, this application provides a mechanical structure for mounting a machine vision camera at a position with increased travel distance, comprising: a fixed bracket; a first slide rail assembly disposed on the fixed bracket; a movable bracket body connected to the first slide rail assembly; a second slide rail assembly disposed on the movable bracket body; a machine vision camera mounting bracket disposed on the second slide rail assembly for mounting the machine vision camera; and a drive assembly disposed on the movable bracket body for driving the movable bracket body to move linearly along the first slide rail assembly and driving the machine vision camera mounting bracket to move linearly along the second slide rail assembly, thereby causing the machine vision camera to switch between a scanning position near the welding torch neck end and an avoidance position away from the welding torch neck end.

[0007] The mechanical structure for mounting a machine vision camera at multiple positions with increased travel distance provided by this invention successfully solves the inherent contradiction between scanning accuracy and equipment safety in existing fixed camera mounting methods through ingenious mechanical design and automated control.

[0008] To provide stable, low-friction linear guidance and to achieve modularity and scalability of the slide rail assembly, in one possible implementation, the first slide rail assembly includes a fixed slide rail and a first slider that mates with the fixed slide rail; the movable support body is mounted on the first slider; the second slide rail assembly includes a movable slide rail and a second slider that mates with the movable slide rail; the movable slide rail is disposed within the movable support body; and the machine vision camera mounting bracket is mounted on the second slider.

[0009] In order to precisely control two-stage movement with a single power source, in one possible implementation, the drive assembly includes a drive motor and a lead screw mechanism driven by the drive motor; the lead screw mechanism includes a parallel spur lead screw and a reverse lead screw, which are synchronously linked with the output shaft of the drive motor through a transmission mechanism.

[0010] To address the technical challenge of synchronously driving two parallel shafts with a single motor and to ensure smooth, accurate, and buffered transmission, in one possible implementation, the transmission mechanism is a synchronous belt transmission mechanism, comprising a drive synchronous pulley mounted on the output shaft of the drive motor, driven synchronous pulleys mounted on the positive and negative thread screws respectively, and a synchronous belt meshing between the drive synchronous pulley and the two driven synchronous pulleys.

[0011] In order to convert the rotational motion into linear motion of the moving support body relative to the fixed support body, in one possible embodiment, the threads on the spur screw and the anti-spur screw have opposite directions of rotation, the spur screw nut that matches the spur screw is fixed on the fixed slide rail, the two ends of the spur screw are rotatably connected to the lower side of the moving support body; and one end of the spur screw passes through the moving support body and is connected to one of the driven synchronous pulleys.

[0012] To achieve the core stroke multiplication effect, a reverse-threaded screw is used to drive the second stage of movement. In one possible implementation, the two ends of the reverse-threaded screw are rotatably connected to the two ends of the upper side of the movable support body; and one end of the reverse-threaded screw passes through the movable support body and is connected to another driven synchronous pulley; so that when the drive motor rotates in one direction, the stroke of the machine vision camera mounting bracket can be multiplied.

[0013] To address the problem of precise position control of moving parts, a hard limit control method is adopted. In one possible implementation, a control component for controlling the dwell position of the machine vision camera is also included. The control component includes at least one limit switch disposed on the moving support body and a photoelectric switch trigger piece disposed on the fixed support body. When the limit switch moves with the moving support body to the photoelectric switch trigger piece, the limit switch is triggered, and the drive component stops working.

[0014] To enhance the flexibility and adaptability of the equipment and enable it to meet the needs of various complex processes, in one possible implementation, the number of limit switches is multiple, each corresponding to a different working position of the machine vision camera, to achieve a multi-position dwell function.

[0015] In this embodiment, multiple limit switches are provided, which allows the machine vision camera to automatically stop at multiple preset positions, such as scanning positions, cleaning positions, and avoidance positions at different distances, greatly expanding the application scenarios of this structure.

[0016] In one possible implementation, the scanning position is located at the neck end of the automatic welding torch, and the avoidance position is located at the flange end of the automatic welding torch.

[0017] According to another aspect, this application also provides an automatic welding torch, including a mechanical structure in which a machine vision camera is mounted at any of the aforementioned stroke multiplication positions, such that the machine vision camera performs close-range scanning of the workpiece at the scanning position and makes room for welding operation of the welding torch at the avoidance position.

[0018] The beneficial effects that the mechanical structure and automatic welding torch with a multiplied stroke position equipped with a machine vision camera disclosed in this application may bring include, but are not limited to: 1. The structure of this application successfully balances scanning accuracy and camera safety; 2. Significantly expands the working space of the welding torch; 3. Achieve efficient and rapid trip multiplication. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mechanical structure of the machine vision camera mounted at the position where the stroke is multiplied in this embodiment; Figure 2 This is a schematic diagram of the mechanical structure of the machine vision camera mounted at the position where the stroke is multiplied in this embodiment (the movable support and the fixed support move relative to each other). Figure 3 This is a schematic diagram of the mechanical structure of the machine vision camera mounted at a position with a multiplied range of motion, as described in this embodiment (the movable support and the fixed support move relative to each other). Figure 4 yes Figure 3 Sectional view of AA; Figure 5 This is a schematic diagram of the mechanical structure of the machine vision camera mounted at the position where the stroke is multiplied, from another perspective of this embodiment. Figure 6 This is a schematic diagram of the synchronous belt drive mechanism in the embodiments of this application.

[0020] Illustration: 1-Fixed bracket, 2-Fixed slide rail, 3-Photoelectric switch trigger piece, 4-Limit switch, 5-Moving bracket body, 6-Moving slide rail, 7-Drive synchronous pulley, 8-Synchronous belt, 9-Driven synchronous pulley, 10-Straight threaded screw, 11-Reverse threaded screw, 12-Drive motor, 13-Machine vision camera mounting bracket, 14-Machine vision camera, 15-Flange end of automatic welding torch, 16-Neck end of welding torch, 17-Support bracket, 18-Straight threaded screw nut, 19-Reverse threaded screw nut. Detailed Implementation

[0021] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] like Figure 1-6 As shown, this application provides a mechanical structure for mounting a machine vision camera at multiple stroke positions, including: a fixed bracket 1, a first slide rail assembly, a movable bracket body 5, a second slide rail assembly, a machine vision camera mounting bracket 13, and a drive assembly.

[0024] The first slide rail assembly is disposed on the fixed bracket 1; the movable bracket body 5 is connected to the first slide rail assembly; the second slide rail assembly is disposed on the movable bracket body 5; the machine vision camera mounting bracket 13 is disposed on the second slide rail assembly for mounting the machine vision camera 14; the drive assembly is disposed on the movable bracket body 5 for driving the movable bracket body 5 to move linearly along the first slide rail assembly and driving the machine vision camera mounting bracket 13 to move linearly along the second slide rail assembly, so as to drive the machine vision camera 14 to change between a scanning position close to the welding torch neck end 16 and a avoidance position away from the welding torch neck end 16.

[0025] The scanning position is located at the neck end of the automatic welding gun, and the avoidance position is located at the flange end 15 of the automatic welding gun.

[0026] The mechanical structure for mounting a machine vision camera at multiple positions with increased travel distance provided by this invention successfully solves the inherent contradiction between scanning accuracy and equipment safety in existing fixed camera mounting methods through ingenious mechanical design and automated control.

[0027] To achieve a wide range of displacement for the machine vision camera 14 within a limited installation space, and to allow it to flexibly switch between a scanning position near the welding torch neck 16 and a clearance position away from the welding torch neck 16, this invention innovatively adopts a series structure consisting of a first slide rail assembly and a second slide rail assembly, with two sliding pairs forming a series connection. The drive assembly simultaneously drives both sliding pairs, resulting in the total displacement of the camera being the sum of two stages of displacement. Compared to a single slide rail structure, this design achieves a greater effective stroke within the same physical space. Its core advantage is realizing long-stroke motion in a compact space, providing a foundation for subsequent stroke multiplication effects. An equivalent configuration could be achieved using other linear motion mechanisms such as rack and pinion systems or linear motors to realize the two-stage movement.

[0028] Specifically, the first slide rail assembly is fixed to the fixed bracket 1, providing guidance for primary movement. The movable bracket body 5 is connected to the first slide rail assembly and can slide along it. The second slide rail assembly is disposed on the movable bracket body 5. The machine vision camera mounting bracket 13 is connected to the second slide rail assembly and can slide along it. The drive assembly is disposed on the movable bracket body 5, and its unique feature is that it can simultaneously drive the movable bracket body 5 to move along the first slide rail assembly and drive the machine vision camera mounting bracket 13 to move along the second slide rail assembly.

[0029] In some embodiments, in order to provide stable, low-friction linear guidance and to achieve modularity and scalability of the slide rail assembly, the first slide rail assembly includes a fixed slide rail 2 and a first slider that cooperates with the fixed slide rail 2; the movable support body 5 is mounted on the first slider; the second slide rail assembly includes a movable slide rail 6 and a second slider that cooperates with the movable slide rail 6; the movable slide rail 6 is disposed within the movable support body 5; and the machine vision camera mounting bracket 13 is mounted on the second slider.

[0030] The fixed slide rail 2 is fixed to the fixed bracket 1, and the movable bracket body 5 is mounted on the fixed slide rail 2 via the first slider. The movable slide rail 6 is fixed as a whole inside the movable bracket body 5, and the machine vision camera mounting bracket 13 is mounted on the movable slide rail 6 via the second slider. The slide rail assembly is concretized into a sliding block and slide rail cooperation form. This is a mature and reliable method for achieving precise linear motion.

[0031] The fixed slide rail 2 provides a fixed reference relative to the welding torch, while the movable slide rail 6 moves together with the movable support body 5, thereby extending the guide base of the camera mounting bracket.

[0032] In some embodiments, in order to precisely control two-stage movement with a single power source, the drive assembly includes a drive motor 12 and a lead screw mechanism driven by the drive motor 12; the lead screw mechanism includes a spur lead screw 10 and a reverse lead screw 11 arranged in parallel, and the spur lead screw 10 and the reverse lead screw 11 are synchronously linked with the output shaft of the drive motor 12 through a transmission mechanism.

[0033] Specifically, the drive motor 12 serves as the power source, transmitting power simultaneously to the spur screw 10 and the anti-pitch screw 11 via a transmission mechanism. To precisely control two stages of movement using the single drive motor 12 and to double the travel of the machine vision camera 14, a mechanism is designed where a single drive motor 12 drives two screws. This solution is compact, simple to control, and ensures the synchronization of the two stages of movement.

[0034] While it's possible to use two servo motors to drive the two lead screws separately and control them synchronously, this would increase cost and control complexity, especially in the limited space required for this application.

[0035] In some embodiments, in order to solve the technical problem of synchronously driving two parallel shafts by a single motor and to ensure the smoothness, accuracy and buffering of the transmission, the transmission mechanism is a synchronous belt 8 transmission mechanism, including a drive synchronous belt pulley 7 mounted on the output shaft of the drive motor 12, driven synchronous belt pulleys 9 respectively mounted on the positive thread screw 10 and the negative thread screw 11, and a synchronous belt 8 meshing between the drive synchronous belt pulley 7 and the two driven synchronous belt pulleys 9.

[0036] The drive motor 12 drives the drive timing pulley 7, which in turn drives the two driven timing pulleys 9 to rotate via the timing belt 8, thereby driving the two lead screws. This application uses timing belt 8 transmission, which can effectively absorb vibration, allow for a certain degree of shaft spacing adjustment, and has low noise.

[0037] Of course, mechanisms that can achieve synchronous transmission, such as chain and sprocket drives or gear drives, can also be used. However, from the perspectives of space utilization, cost-effectiveness, and assembly complexity, none of these are as advantageous as the technical solution in this application.

[0038] In order to convert the rotational motion into linear motion of the movable support body 5 relative to the fixed support 1, in one possible embodiment, the threads on the spur screw 10 and the anti-spur screw 11 are opposite in direction, the spur screw nut 18 matching the spur screw 10 is fixed on the fixed slide rail 2, the two ends of the spur screw 10 are rotatably connected to the lower side of the movable support body 5; and one end of the spur screw 10 passes through the movable support body 5 and is connected to one of the driven synchronous pulleys 9.

[0039] The spur screw 10 and the anti-spur screw 11 have opposite thread directions. The nut of the spur screw 10 is fixed to a support bracket 17 on the fixed slide rail 2, ensuring that the rotation of the spur screw 10 does not interfere with the fixed slide rail 2. The spur screw 10 itself is rotatably connected to the movable support body 5. When the spur screw 10 rotates, since its spur screw nut 18 is fixed to the bracket, i.e., stationary relative to the fixed support 1, the rotation of the spur screw 10 is converted into linear motion of the spur screw 10 itself along the spur screw nut 18, together with the movable support body 5. This is the principle that drives the movable support body 5 to move along the first slide rail assembly.

[0040] This application employs a rotating lead screw coupled with a fixed nut as the motion mechanism. This design allows the drive motor 12 to be mounted on the movable support body 5, simplifying the power transmission path.

[0041] In some embodiments, to achieve the core stroke multiplication effect, a reverse-threaded screw 11 is provided to drive the second-stage movement. The two ends of the reverse-threaded screw 11 are rotatably connected to the two ends of the upper side of the movable support body 5; and one end of the reverse-threaded screw 11 passes through the movable support body 5 and is connected to another driven synchronous pulley 9; so that when the drive motor 12 rotates in one direction, the stroke of the machine vision camera mounting bracket 13 can be multiplied.

[0042] The reverse-threaded screw 11 is rotatably connected to the movable support body 5, and the driven synchronous pulley 9 on it moves accordingly; the machine vision camera mounting bracket 13 is connected to the nut 19 of the reverse-threaded screw. When the reverse-threaded screw 11 moves with the movable support body 5 and is simultaneously driven to rotate, its rotation will drive the nut 19 of the reverse-threaded screw, which meshes with it, to produce linear motion relative to the movable support body 5, thereby driving the machine vision camera mounting bracket 13 to move along the second slide rail assembly.

[0043] like Figure 2-4As shown, to achieve the core stroke multiplication effect, a reverse-threaded lead screw 11 is used to drive the second-stage movement. When the drive motor 12 is working, the spur-threaded lead screw 10 drives the moving support body 5 to move (first-stage displacement, denoted as S1), while simultaneously, the reverse-threaded lead screw 11 drives the camera mounting bracket to move relative to the moving support body 5 (second-stage displacement, denoted as S2). Since the two screws are driven synchronously and rotate in opposite directions, the total displacement of the camera relative to the fixed bracket 1 is S1 + S2. The key is that one rotation of the motor generates both S1 and S2 simultaneously, and in the same direction, thus achieving displacement multiplication. This greatly improves the movement efficiency and is one of the main innovations of this invention.

[0044] See Figure 5-6 In some embodiments, in order to solve the problem of precise position control of the moving parts, a hard limit control method is adopted, and a control component for controlling the dwell position of the machine vision camera 14 is also included. The control component includes at least one limit switch 4 disposed on the moving support body 5 and a photoelectric switch trigger piece 3 disposed on the fixed support 1. When the limit switch 4 moves with the moving support body 5 to the photoelectric switch trigger piece 3, the limit switch 4 is triggered, and the drive component stops working.

[0045] When the movable support 5, carrying the limit switch 4, moves to a specific position on the fixed support 1, namely the position where the photoelectric switch trigger piece 3 is installed, a trigger signal is issued, controlling the motor to stop. By placing the limit switch 4 on the movable support 5 and fixing the trigger piece to the fixed support 1, wiring becomes more convenient.

[0046] In some embodiments, in order to enhance the flexibility and adaptability of the equipment and enable it to meet the needs of various complex processes, the number of limit switches 4 is multiple, each corresponding to a different working position of the machine vision camera 14, so as to realize the multi-position dwell function.

[0047] In this embodiment, multiple limit switches 4 are provided, which allows the machine vision camera 14 to automatically stop at multiple preset positions, such as scanning positions, cleaning positions, and avoidance positions at different distances, greatly expanding the application scenarios of this structure.

[0048] In some embodiments, this application also provides an automatic welding torch, wherein the mechanical structure is configured to be mounted on the automatic welding torch, such that the machine vision camera 14 performs close-range scanning of the workpiece at the scanning position and makes room for welding operation at the avoidance position.

[0049] In some embodiments, the working principle of this application is described in detail below: 1. After receiving the control command, the system starts the drive motor 12.

[0050] 2. The rotational power of the drive motor 12 is simultaneously distributed to two parallel lead screws with opposite thread directions—positive thread lead screw 10 and negative thread lead screw 11—through the synchronous belt 8 transmission mechanism.

[0051] First stage of motion (movement of the moving support body 5): The lead screw nut 18 is fixed on the fixed slide rail 2 (i.e., stationary relative to the fixed support 1). Therefore, when the lead screw 10 rotates, it will drive the entire moving support body 5 to move linearly along the fixed slide rail 2.

[0052] Second-stage motion (relative motion of the camera mount): The nut 19 of the reverse threaded screw is connected to the machine vision camera mounting bracket 13. When the reverse threaded screw 11 rotates, it drives the camera mounting bracket to move linearly along the movable slide rail 6 fixed on the movable bracket body 5.

[0053] 3. Increased Stroke: The key lies in the fact that a single rotation of the motor simultaneously generates the two stages of motion described above. Since the two lead screws rotate in opposite directions but are driven synchronously, when the motor rotates in one direction, the two stages of motion are in the same direction. Therefore, the total displacement of the machine vision camera 14 relative to the fixed support 1 is the sum of the displacement of the moving support body 5 (S1) and the displacement of the camera mounting bracket relative to the moving support body 5 (S2) (S1+S2). This achieves increased stroke—doubling the moving speed and effective range while keeping the motor speed and lead screw lead constant.

[0054] 4. Precise Position Control: Limit switches 4 are installed on the movable support body 5, and photoelectric switch trigger pieces 3 are installed at preset positions on the fixed support body 1. When the movable support body 5 moves to the target position (such as the scanning position or the avoidance position), the limit switch 4 is triggered, the signal is transmitted to the control system, and the motor power is immediately cut off, achieving precise stopping of the position. By setting multiple trigger pieces, precise stopping at multiple positions can be achieved.

[0055] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A mechanical structure for mounting a machine vision camera at a position that increases the stroke, characterized in that, include: Fixed bracket (1); The first slide rail assembly is mounted on the fixed bracket (1); The movable support body (5) is connected to the first slide rail assembly; The second slide rail assembly is disposed on the movable support body (5); A machine vision camera mounting bracket (13) is disposed on the second slide rail assembly for mounting a machine vision camera (14). A drive component is disposed on the movable support body (5) for driving the movable support body (5) to move linearly along the first slide rail assembly and driving the machine vision camera mounting bracket (13) to move linearly along the second slide rail assembly, so as to drive the machine vision camera (14) to change between a scanning position close to the welding torch neck end (16) and a avoidance position away from the welding torch neck end (16).

2. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 1, characterized in that, The first slide rail assembly includes a fixed slide rail (2) and a first slider that cooperates with the fixed slide rail (2); the movable support body (5) is mounted on the first slider; the second slide rail assembly includes a movable slide rail (6) and a second slider that cooperates with the movable slide rail (6); the movable slide rail (6) is disposed inside the movable support body (5); the machine vision camera mounting bracket (13) is mounted on the second slider.

3. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 2, characterized in that, The drive assembly includes a drive motor (12) and a lead screw mechanism driven by the drive motor (12); the lead screw mechanism includes a positive lead screw (10) and a negative lead screw (11) arranged in parallel, and the positive lead screw (10) and the negative lead screw (11) are synchronously linked with the output shaft of the drive motor (12) through a transmission mechanism.

4. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 3, characterized in that, The transmission mechanism is a synchronous belt (8) transmission mechanism, including a drive synchronous belt pulley (7) mounted on the output shaft of the drive motor (12), driven synchronous belt pulleys (9) mounted on the positive thread screw (10) and the negative thread screw (11) respectively, and a synchronous belt (8) meshing between the drive synchronous belt pulley (7) and the two driven synchronous belt pulleys (9).

5. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 4, characterized in that, The threads on the positive thread screw (10) and the negative thread screw (11) are opposite in direction. The positive thread screw nut (18) that matches the positive thread screw (10) is fixed on the fixed slide rail (2). The two ends of the positive thread screw (10) are rotatably connected to the lower side of the movable support body (5). One end of the positive thread screw (10) passes through the movable support body (5) and is connected to one of the driven synchronous pulleys (9).

6. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 5, characterized in that, The two ends of the reverse threaded rod (11) are rotatably connected to the two ends of the upper side of the movable support body (5); and one end of the reverse threaded rod (11) passes through the movable support body (5) and is connected to another driven synchronous pulley (9); so that when the drive motor (12) rotates in one direction, the stroke that can drive the machine vision camera mounting bracket (13) to move is multiplied.

7. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 1, characterized in that, It also includes a control component for controlling the dwell position of the machine vision camera (14). The control component includes at least one limit switch (4) disposed on the movable support body (5) and a photoelectric switch trigger piece (3) disposed on the fixed support (1). When the limit switch (4) moves with the movable support body (5) to the photoelectric switch trigger piece (3), the limit switch (4) is triggered and the drive component stops working.

8. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 7, characterized in that, The number of limit switches (4) is multiple, each corresponding to a different working position of the machine vision camera (14) to achieve multi-position dwell function.

9. The mechanical structure for mounting a machine vision camera at a position with increased stroke as described in claim 1, characterized in that, The scanning position is located at the neck end of the automatic welding gun, and the avoidance position is located at the flange end (15) of the automatic welding gun.

10. An automatic welding torch, characterized in that, The mechanical structure includes a machine vision camera mounted at the stroke multiplication position as described in any of claims 1-9, such that the machine vision camera (14) performs close-range scanning of the workpiece at the scanning position and creates welding operation space for the welding torch at the avoidance position.

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