A laser welding seam visual tracking system

Abstract

The present invention discloses a laser welding weld visual tracking system, including a laser welding machine Z axis, a welding head is arranged below the front of the laser welding machine Z axis, a linear module is connected to the right side of the welding head, the right side of the linear module is fixed on the laser welding machine Z axis, a servo motor driving it to slide forward and backward on a mobile module mounting frame is arranged on the top, a visual component mounting plate fixedly connected to the laser welding machine Z axis is arranged on the left side of the outside, a light source mounting frame is fixedly arranged on the left side of the visual component mounting plate, a light source is fixedly connected to the bottom of the light source mounting frame, a camera is arranged on the top, and an air knife is arranged below the visual component mounting plate. This laser welding weld visual tracking system can effectively find the welding center, reduce the requirements for positioning tooling, and is suitable for welding machines that weld slightly irregular welds, so that the welding head can track the weld operation, thereby increasing the yield rate and ensuring welding quality and welding efficiency.

Description

Technical Field

[0001] The invention relates to the field of laser welding of ion membrane electrolyzers, and in particular to a laser welding weld visual tracking system. Background Art

[0002] The chlor-alkali industry is one of the most basic chemical industries. The current domestic production methods are the diaphragm method and the ion exchange membrane method. The ion membrane electrolyzer is a common component in the modern chlor-alkali industry. During the production of the ion membrane electrolyzer, welding the grid plate with other parts is a major problem.

[0003] At present, the welding of ion membrane electrolyzers and the fixing of grid plates are all done manually, and the position requirements of the other parts are not particularly strict, which leads to the welding requirements of the grid plate and the connecting plate not being in a straight line, and the welding center point will be irregularly offset to the left and right. However, due to the role of ion membrane electrolyzers in the chlor-alkali industry, there are relatively strict requirements for the welding contact length and quality of the grid plate and the frame. Although the manual welding method can meet certain requirements, it is time-consuming and has low production efficiency.

[0004] With the development of modern industry, laser welding technology has been continuously improved, and the proportion of laser welding in industrial applications has continued to increase. Laser welding can complete higher-quality welding at a faster speed and improve production efficiency; however, due to the irregular arrangement of the welding points of the ion membrane electrolyzer and the grid plate fixing, the existing laser welding method is prone to welding deviation, so manual repair welding is required after welding, which is inefficient and prone to loss. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a laser welding weld seam visual tracking system which can track the weld seam, fully weld the workpiece and improve the welding efficiency.

[0006] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: a laser welding weld visual tracking system, including a Z-axis of a laser welding machine, a welding head with a top connected to an optical fiber is arranged at the lower front of the Z-axis of the laser welding machine, a linear module capable of driving it to move forward and backward is connected to the right side of the welding head, a mobile module mounting frame is arranged on the right side of the linear module, and the mobile module mounting frame is fixedly connected to the Z-axis of the laser welding machine, and the linear module and the mobile module mounting frame are slidably matched through mutually matching sliders and slide grooves, a servo motor driving it to slide forward and backward on the mobile module mounting frame is arranged on the top of the linear module, and an X0 axis is formed, and a linear module connected to the Z-axis of the laser welding machine is arranged on the left side outside. A fixedly connected visual component mounting plate, a light source mounting frame in a circular ring structure is fixedly arranged on the left side of the visual component mounting plate, a circular ring light source concentric with its center hole is fixedly connected to the bottom of the light source mounting frame, a camera is arranged on the top, the lens of the camera is vertically downward and corresponds to the center of the center hole on the light source mounting frame, and the camera is fixedly connected to the left side of the visual component mounting plate through the camera mounting frame; an air knife corresponding to the bottom position of the light source is arranged below the visual component mounting plate, and the air knife is connected through an air knife bracket fixedly connected to the lower right side of the visual component mounting plate; the camera, light source, linear module and servo motor are all connected to a PLC arranged outside the Z axis of the laser welding machine through lines and are controlled by the PLC.

[0007] Preferably, the servo motor is fixedly connected together through a motor mounting plate fixedly arranged on the front end surface of the linear module, the drive shafts in the servo motor and the linear module pass through two through holes preset on the motor mounting plate and extend outside the front end surface of the motor mounting plate, and the upper and lower synchronous pulleys are respectively arranged on the extended ends of the drive shafts in the servo motor and the linear module, and the upper and lower synchronous pulleys are connected by a synchronous belt transmission, and the servo motor drives the lower synchronous pulley to rotate through the upper synchronous pulley and the synchronous belt, thereby driving the linear module to move back and forth on the movable module mounting frame.

[0008] Preferably, a cylinder mounting plate is fixedly connected to the Z-axis of the laser welding machine, and the cylinder mounting plate is located above the movable module mounting frame, and a cylinder is fixedly arranged on the right side thereof. The cylinder has a piston rod with one end facing downward, and a blow pipe clamp is fixedly arranged on the end thereof, and the blow pipe clamp is fixed with a blow pipe having a terminal end connected to a protective gas pipe and a mouth corresponding to the welding head, and the blow pipe realizes up and down movement by driving the blow pipe clamp through the piston rod.

[0009] Preferably, a dust removal pipe is fixedly connected to the Z-axis of the laser welding machine through a mounting plate. The dust removal pipe is located at the lower left side of the light source, the head of the pipe is curved and corresponds to the welding head, and the end is connected to the vacuum pump arranged outside the Z-axis of the laser welding machine through a hose.

[0010] Preferably, dustproof shells are provided on the outer sides of the lower synchronous pulley, the synchronous belt and the upper synchronous pulley.

[0011] Preferably, the lower synchronous belt pulley and the upper synchronous belt pulley are both toothed wheels, and the synchronous belt is a toothed belt that is toothedly meshed with the lower synchronous belt pulley and the upper synchronous belt pulley.

[0012] Preferably, there are two air blowing pipes, which are symmetrically arranged on the left and right sides of the welding head, and the two air blowing pipes are connected by an air blowing pipe clamp which is sleeved on the outside of the top of the welding head and connected to the cylinder piston rod.

[0013] Compared with the prior art, the advantages of the present invention are: this laser welding weld visual tracking system can effectively locate the welding center, reduce the requirements for positioning tooling, and is suitable for welding machines that weld slightly irregular welds, so that the welding head can track the weld operation, thereby increasing the yield rate and ensuring welding quality and welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings.

[0015] Figure 1 and Figure 2 It is a three-dimensional structural schematic diagram of a laser welding weld visual tracking system of the present invention.

[0016] In the figure: 1. Camera; 2. Lens; 3. Light source; 4. Dust removal pipe; 5. Light source mounting frame; 6. Visual component mounting plate; 7. Welding head; 8. Linear module; 9. Motor mounting plate; 10. Lower synchronous pulley; 11. Synchronous belt; 12. Upper synchronous pulley; 13. Servo motor; 14. Camera mounting frame; 15. Air knife; 16. Air knife bracket; 17. Mobile module mounting frame; 18. Air blow pipe; 19. Air blow pipe clamp; 20. Cylinder; 21. Cylinder mounting plate; 22. Laser welding machine Z axis. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 and Figure 2A laser welding weld visual tracking system is shown, including a laser welding machine Z-axis 22, a welding head 7 whose top is connected to an optical fiber is arranged below the front of the laser welding machine Z-axis 22, a linear module 8 capable of driving it to move forward and backward is connected to the right side of the welding head 7, a mobile module mounting frame 17 is arranged on the right side of the linear module 8, and the mobile module mounting frame 17 is fixedly connected to the laser welding machine Z-axis 22, the linear module 8 and the mobile module mounting frame 17 are slidably matched by mutually matching sliders and slide grooves, a servo motor 13 is arranged on the top of the linear module 8 to drive it to slide forward and backward on the mobile module mounting frame 17, and an X0 axis is formed, and a visual component mounting plate 6 fixedly connected to the laser welding machine Z-axis 22 is arranged on the left side of the linear module 8. A light source mounting frame 5 with a circular ring structure is fixedly arranged on the left side of the visual component mounting plate 6, a circular ring light source 3 concentric with its center hole is fixedly connected to the bottom of the light source mounting frame 5, and a camera 1 is arranged on the top, the lens 2 of the camera 1 is vertically downward and corresponds to the center of the center hole on the light source mounting frame 5, and the camera 1 is fixedly connected to the left side of the visual component mounting plate 6 through the camera mounting frame 14; an air knife 15 corresponding to the bottom position of the light source 3 is arranged below the visual component mounting plate 6, and the air knife 15 is connected through an air knife bracket 16 fixedly connected to the lower right side of the visual component mounting plate 6; the camera 1, light source 3, linear module 8 and servo motor 13 are all connected to the PLC arranged outside the Z axis 22 of the laser welding machine through lines and are controlled by the PLC.

[0019] In order to ensure that the servo motor 13 can be bound together with the linear module 8 and the linear module 8 can be driven to move by the servo motor 13, the servo motor 13 is fixedly connected together by a motor mounting plate 9 fixedly arranged on the front end face of the linear module 8, the servo motor 13 and the transmission shaft in the linear module 8 pass through two preset through holes on the motor mounting plate 9 and extend outside the front end face of the motor mounting plate 9, the servo motor 13 and the transmission shaft in the linear module 8 are respectively provided with an upper synchronous pulley 12 and a lower synchronous pulley 10 on the extended ends of the transmission shaft in the linear module 8, the upper synchronous pulley 12 and the lower synchronous pulley 10 are connected through a synchronous belt 11, the servo motor 13 drives the lower synchronous pulley 10 to rotate through the upper synchronous pulley 12 and the synchronous belt 11, thereby driving the linear module 8 to move back and forth on the mobile module mounting frame 17.

[0020] In order to ensure the welding quality of the welding head 7, a cylinder mounting plate 21 is fixedly connected to the Z-axis 22 of the laser welding machine. The cylinder mounting plate 21 is located above the mobile module mounting frame 17, and a cylinder 20 is fixedly arranged on its right side. The cylinder 20 has one end of a piston rod facing downward, and a blow pipe clamp 19 is fixedly arranged on its end. The blow pipe clamp 19 is fixed with a blow pipe 18 whose end is connected to a protective gas pipe and whose mouth corresponds to the welding head 7. The blow pipe 18 is driven by the piston rod to move up and down. There are two blow pipes 18, which are symmetrically arranged on the left and right sides of the welding head 7. The two blow pipes 18 are connected by a blow pipe clamp 19 which is sleeved on the outside of the top of the welding head 7 and connected to the piston rod of the cylinder 20.

[0021] In order to prevent welding slag from falling onto the welding point and affecting welding when welding, a dust removal pipe 4 is fixedly connected to the Z-axis 22 of the laser welding machine through a mounting plate. The dust removal pipe 4 is located at the lower left side of the light source 3, and its head is curved and corresponds to the welding head 7. The end is connected to the vacuum pump arranged outside the Z-axis 22 of the laser welding machine through a hose.

[0022] In order to prevent welding slag or dust from falling and affecting the transmission between the linear module 8 and the servo motor 13, dustproof shells are provided on the outer sides of the lower synchronous pulley 10, the synchronous belt 11 and the upper synchronous pulley 12.

[0023] In order to ensure the transmission stability between the lower synchronous belt pulley 10 and the upper synchronous belt pulley 12, the lower synchronous belt pulley 10 and the upper synchronous belt pulley 12 are both toothed wheels, and the synchronous belt 11 is a toothed belt, which is toothedly meshed with the lower synchronous belt pulley 10 and the upper synchronous belt pulley 12.

[0024] Its specific working principle is as follows: first, the machine tool host needs to be adjusted according to the welding requirements of the welded parts. The user inputs specific welding parameters and edits the corresponding welding program. After the editing is completed, the Z axis 22 of the laser welding machine is moved to the welding start position, and the machine tool welding starts; after the welding starts, the camera 1 takes pictures of the welded parts through the lens 2 at intervals within the specified time. When taking pictures, the light source 3 is turned on to fill in the light in the photographing area, so that the camera 1 can take clearer images and facilitate the processing of the visual system; at the same time, the air knife 15 blows air to prevent the welding slag generated by the welding head 7 from splashing onto the light source 3, the lens 2 and the camera 1, and burning these devices; The image generated by the photo is processed by an external visual system to generate coordinate data and write it into a buffer. Then, the external PLC reads the data from the buffer, processes the data, and generates compensation coordinates. Then, the PLC controls the servo motor 13 to move according to the generated data through the servo drive. The servo motor 13 drives the upper synchronous pulley 12 connected to it to rotate, and drives the lower synchronous pulley 10 to rotate through the synchronous belt 11, thereby driving the linear module 8 connected to it to move. Then, the linear module 8 drives the welding head 7 connected to it to move, thereby performing welding position compensation, so that the welding point of the welding head 7 can be at the welding center of the welded part to ensure the welding quality. When welding, the cylinder 20 moves with ventilation and sends the air blowing pipe 18 to the corresponding welding point of the welding head 7 through the piston rod, and blows out the welding shielding gas at the same time to ensure the welding quality. When the welding head 7 is welding, the dust removal pipe exhausts air from the periphery of the welding head 7 to absorb the welding slag to prevent the welding slag from falling on the welding point and affecting the welding effect.

[0025] This laser welding weld visual tracking system can effectively locate the welding center. Precise welding can be achieved through the servo-driven X, Y, Z axes and position-compensated X0 axis on the laser welding machine. The welding accuracy is ±0.15mm from the welding center of the grid plate. During welding, the camera 1 first takes a picture to obtain a point, and then forms an offset coordinate through software and PLC processing to transmit it to the host. The host controls the Y axis and X0 axis for position compensation, so that the welding head 7 can find the correct position to ensure a good weld. At the same time, the requirements for positioning tooling are reduced. It is suitable for welding machines for welding slightly irregular welds, so that the welding head can track the weld operation, thereby increasing the yield rate and ensuring welding quality and efficiency.

[0026] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A laser welding seam visual tracking system, comprising a laser welding machine Z axis (22), characterized in that: A welding head (7) whose top is connected to the optical fiber is arranged below the front of the Z axis (22) of the laser welding machine. A linear module (8) capable of driving the welding head (7) to move forward and backward is connected to the right side of the welding head (7). A movable module mounting frame (17) is arranged on the right side of the linear module (8). The movable module mounting frame (17) is fixedly connected to the Z axis (22) of the laser welding machine. The linear module (8) and the movable module mounting frame (17) are slidably matched through mutually matched sliders and slide grooves. A servo motor (13) is arranged on the top of the linear module (8) to drive the linear module to slide forward and backward on the movable module mounting frame (17), and the linear module (8) forms an X0 axis. A visual component mounting plate (6) fixedly connected to the Z axis (22) of the laser welding machine is arranged on the left side of the linear module. A circular A light source mounting frame (5) of an annular structure, wherein a circular light source (3) concentric with the center hole of the light source mounting frame (5) is fixedly connected to the bottom of the light source mounting frame (5), and a camera (1) is arranged on the top, wherein the lens (2) of the camera (1) is vertically downward and corresponds to the center of the center hole on the light source mounting frame (5), and the camera (1) is fixedly connected to the left side of the visual component mounting plate (6) through the camera mounting frame (14); an air knife (15) corresponding to the bottom position of the light source (3) is arranged below the visual component mounting plate (6), and the air knife (15) is connected through an air knife bracket (16) fixedly connected to the lower right side of the visual component mounting plate (6); the camera (1), the light source (3), the linear module (8) and the servo motor (13) are all connected to a PLC arranged outside the Z axis (22) of the laser welding machine through lines and are controlled by the PLC; The servo motor (13) is fixedly connected together by a motor mounting plate (9) fixedly arranged on the front end surface of the linear module (8); the drive shafts in the servo motor (13) and the linear module (8) pass through two through holes preset on the motor mounting plate (9) and extend outside the front end surface of the motor mounting plate (9); an upper synchronous pulley (12) and a lower synchronous pulley (10) are respectively arranged on the extended ends of the drive shafts in the servo motor (13) and the linear module (8); the upper synchronous pulley (12) and the lower synchronous pulley (10) are connected through a synchronous belt (11); the servo motor (13) drives the lower synchronous pulley (10) to rotate through the upper synchronous pulley (12) and the synchronous belt (11), thereby driving the linear module (8) to move forward and backward on the movable module mounting frame (17); A cylinder mounting plate (21) is fixedly connected to the Z axis (22) of the laser welding machine. The cylinder mounting plate (21) is located above the movable module mounting frame (17). A cylinder (20) is fixedly arranged on the right side thereof. The cylinder (20) has a piston rod with one end facing downwards, and a blow pipe clamp (19) is fixedly arranged at the end thereof. The blow pipe clamp (19) is fixed with a blow pipe (18) whose end is connected to a protective gas pipe and whose mouth corresponds to the welding head (7). The blow pipe (18) is driven by the piston rod to move up and down. A dust removal pipe (4) is fixedly connected to the Z axis (22) of the laser welding machine via a mounting plate, the dust removal pipe (4) is located below the left side of the light source (3), the head of the dust removal pipe (4) is curved and corresponds to the welding head (7), and the end of the dust removal pipe is connected to an exhaust fan arranged outside the Z axis (22) of the laser welding machine via a hose; The outer sides of the lower synchronous pulley (10), the synchronous belt (11) and the upper synchronous pulley (12) are provided with dustproof shells; The lower synchronous belt pulley (10) and the upper synchronous belt pulley (12) are both toothed wheels, and the synchronous belt (11) is a toothed belt that is tooth-engaged with the lower synchronous belt pulley (10) and the upper synchronous belt pulley (12); The two air blowing pipes (18) are symmetrically arranged on the left and right sides of the welding head (7), and the two air blowing pipes (18) are connected by an air blowing pipe clamp (19) which is sleeved on the outside of the top of the welding head (7) and connected to the piston rod of the cylinder (20); Welding is achieved by the following steps: S1. The machine tool host needs to be adjusted according to the welding requirements of the welded parts. The user enters specific welding parameters and edits the corresponding welding program; S2. After the editing is completed, the Z axis (22) of the laser welding machine is moved to the welding starting position, and the machine tool welding starts; S3. After welding starts, the camera (1) takes pictures at intervals, and the camera (1) takes pictures of the welded part through the lens (2) within a specified time. When taking pictures, the light source (3) is turned on to fill in the picture area, so that the camera (1) can take clearer pictures, which is convenient for the visual system to process; S4. At the same time, the air knife (15) blows air to prevent the welding slag generated by the welding head 7 from splashing onto the light source (3), the lens (2) and the camera (1), burning these devices; S5. The image generated by the camera is processed by an external visual system to generate coordinate data, which is written into a buffer. Then, an external PLC reads the data from the buffer and processes the data to generate compensation coordinates. S6.PLC controls the servo motor (13) to move through the servo drive according to the generated data, and the servo motor (13) drives the upper synchronous pulley (12) connected thereto to rotate, and drives the lower synchronous pulley (10) to rotate through the synchronous belt (11), thereby driving the linear module (8) connected thereto to move; S7. The linear module 8 drives the welding head (7) connected thereto to move, thereby performing welding position compensation, so that the welding point of the welding head (7) can be at the welding center of the welded part to ensure welding quality; S8. When welding, the cylinder (20) moves to ventilate and delivers the air blowing pipe (18) to the corresponding welding point of the welding head (7) through the piston rod, and blows out welding shielding gas to ensure the welding quality. When the welding head (7) is welded, the dust removal pipe is directed to the periphery of the welding head (7) to extract air and absorb the welding slag to prevent the welding slag from falling on the welding point and affecting the welding effect; This laser welding weld visual tracking system can effectively locate the welding center. Through the servo-driven X, Y, Z axes and the position compensation X0 axis on the laser welding machine, accurate welding can be achieved. The welding accuracy is ±0.15mm from the welding center of the grid plate. During welding, the camera (1) first takes a picture to obtain a point, and then the offset coordinates are processed by software and PLC to transmit to the host. The host controls the Y axis and X0 axis to perform position compensation, so that the welding head (7) can find the correct position to ensure a good weld. At the same time, the requirements for positioning tooling are reduced. It is suitable for welding machines that weld slightly irregular welds, so that the welding head can track the weld operation, thereby increasing the yield rate and ensuring welding quality and welding efficiency.

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