Double-beam laser welding device
By using arc guide rails and synchronous slip assembly design in the dual-beam laser welding device, the problem of intersection position offset when changing the laser angle is solved, and the effect of simplifying the control process and reducing the sensitivity requirements of the robot arm is achieved.
Patent Information
- Application Number
- CN202421306634.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-07
AI Technical Summary
In a dual-beam laser welding device, when the angle between the two lasers is changed, the intersection position of the two lasers is easily deviated, resulting in cumbersome control process and high requirements for the sensitivity of the robot arm.
Design a dual-beam laser welding device, which uses the guide rails to be arranged in an arc and the centers overlap. The axis of the laser welding head and the normal of the guide rail are perpendicular to each other. The adjustment frame is driven through the synchronous sliding assembly to ensure that the two beams are The laser always intersects at the center of the rail.
The offset of the intersection position of the two laser beams is effectively avoided, the control process is simplified, the requirements for the sensitivity of the robotic arm are reduced, and thus the welding cost is reduced.
Smart Images
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Abstract
Description
Technical Field
[0001] The present application relates to the field of laser processing technology, and in particular to a dual-beam laser welding device. Background Art
[0002] Dual-beam laser welding technology is widely used in metal products in different industries, especially high-precision welding in manufacturing industries such as automobiles, aircraft, rail transportation, electronics, and ships. Compared with other welding processes, dual-beam laser welding products are more accurately formed, have lower defect rates, and are faster in welding, which helps reduce production costs.
[0003] In the related technology, there is a dual-beam laser welding device, which includes a robotic arm on which a group of laser welding heads are symmetrically and rotatably arranged; during welding, the two laser welding heads are driven to emit lasers at the same time, the two laser beams intersect and irradiate the welding area of the workpiece, and then the workpiece is welded, and according to the welding requirements, the two laser welding heads can be driven to deflect to change the angle between the two laser beams to control the welding depth and welding quality.
[0004] In the process of implementing this application, it was found that there are at least the following problems in this technology: whenever the angle between the two laser beams is changed, that is, the two laser welding heads are deflected, the intersection position of the two laser beams changes accordingly. At this time, the cooperation of the robotic arm is required to ensure that the two laser beams intersect and continue to irradiate the welding area of the workpiece. Therefore, the control process is cumbersome and requires a high sensitivity of the robotic arm. Utility Model Content
[0005] In order to avoid the deviation of the intersection position of the two laser beams as much as possible when changing the angle between the two laser beams and simplify the control process, the present application provides a dual-beam laser welding device.
[0006] The dual-beam laser welding device provided in this application adopts the following technical solution:
[0007] A dual-beam laser welding device comprises a robotic arm, a group of guide rails are fixed and symmetrically arranged on both sides of the robotic arm, the guide rails are arranged in an arc shape with the centers of the circles coinciding, an adjustment frame is slidably arranged on the guide rails, a laser welding head is fixedly mounted on the adjustment frame, the axis of the laser welding head and the normal of the guide rail are perpendicular to each other, and a synchronous sliding component is arranged on the robotic arm, the synchronous sliding component is used to drive a group of adjustment frames to synchronously perform symmetrical sliding motion relative to the robotic arm.
[0008] By adopting the above technical scheme, since the guide rail is set in an arc shape and the centers of the arcs coincide, and the axis of the laser welding head is perpendicular to the normal of the guide rail, no matter how the adjustment frame slides, the welding laser emitted by the laser welding head will always pass through the center of the guide rail, and then no matter how the angle between the two laser beams changes, the two laser beams will always intersect at the center of the guide rail; in addition, when it is necessary to adjust the angle between the two laser beams, the two adjustment frames are driven by the synchronous sliding component to perform symmetrical sliding movements relative to the robot arm, that is, the two laser beams simultaneously approach or move away from the robot arm, and the two laser welding heads always emit symmetrical lasers on both sides of the robot arm, thereby simplifying the control process: the synchronous sliding component adjusts the angle between the two laser beams, and the robot arm only needs to adjust the welding position and the overall welding angle, which helps to reduce the requirements on the sensitivity of the robot arm, thereby reducing the welding cost; in summary, when changing the angle between the two laser beams, the offset of the intersection position of the two laser beams is avoided as much as possible, and it helps to simplify the control process.
[0009] Preferably, the synchronous sliding assembly includes a rotating member, a rotating shaft, an arc rack, and a gear. A driving groove is opened on the guide rail, the arc rack is fixedly arranged on the inner wall of the driving groove, the rotating shaft passes through and is rotatably arranged on the guide rail, the gear is fixedly arranged on the rotating shaft, the gear and the arc rack are meshed with each other, and the rotating member is used to drive the two rotating shafts to rotate in the same direction at the same time.
[0010] By adopting the above technical solution, when the adjusting frame needs to be driven to slide, the rotating shaft is driven to rotate by the rotating member, and the gear meshes with the arc rack and rotates to drive the adjusting frame to slide along the guide rail, thereby driving the adjusting frame to slide along the guide rail.
[0011] Preferably, the arc rack is divided into an inner rack and an outer rack, the inner rack is fixed on the inner wall of one of the driving grooves, the outer rack is fixed on the outer wall of one of the driving grooves, and the modules of the inner rack and the outer rack are equal.
[0012] By adopting the above technical solution, the rotating member drives the two rotating shafts to rotate in the same direction at the same time, so that the two gears rotate in the same direction. At this time, one of the gears is meshed with the external gear, and the other gear is meshed with the internal gear, so that the two adjustment frames make synchronous reverse sliding motions. Since the modules of the internal rack and the external rack are equal, the sliding distances of the two adjustment frames are always equal, thereby driving the two adjustment frames to slide synchronously and symmetrically.
[0013] Preferably, the rotating part includes a sliding block, a driving pulley, a transmission belt, a driven pulley, and a motor. A sliding groove is opened on the robotic arm, and the sliding block is slidingly set in the sliding groove. The driving pulley is rotatably set on the sliding block, and the motor is fixedly set on the sliding block. The driving shaft of the motor passes through the sliding block and is fixedly connected to the driving pulley, and the driven pulley is fixedly connected to the rotating shaft. Two transmission belts are sleeved on the driving pulley, one of which connects the driving pulley and one of the driven pulleys, and the other transmission belt connects the driving pulley and the other driven pulley.
[0014] By adopting the above technical solution, the motor is driven to output torque to drive the driving pulley to rotate, and the two transmission belts transmit the torque to the driven pulleys on the adjustment frames on both sides to drive the adjustment frames to slide; but when the adjustment frames slide on the guide rails, the distance between the driving pulley and the driven pulley changes. At this time, it is only necessary to drive the sliding block to slide in the sliding groove to maintain the distance between the driven pulley and the driving pulley to ensure that the transmission belt is tightened between the driving pulley and the driven pulley; thereby driving the two rotating shafts to rotate simultaneously and in the same direction.
[0015] Preferably, a tension spring is arranged in the slide groove, one end of the tension spring abuts against the sliding block, and the other end of the tension spring abuts against the bottom wall of the slide groove, and the tension spring drives the sliding block away from the bottom wall of the slide groove.
[0016] By adopting the above technical solution, when the distance between the driving pulley and the driven pulley tends to change, the tension spring drives the sliding block away from the bottom wall of the slide groove, and the sliding block automatically moves accordingly to ensure that the transmission belt is tightened between the driving pulley and the driven pulley.
[0017] Preferably, a pointer is fixedly provided on the sliding block, a calibration scale is fixedly provided on the surface of the robotic arm, and the pointer points to the scale of the calibration scale.
[0018] By adopting the above technical solution, during the long-term use of the device, the transmission belt may slip or be stretched, resulting in a large error between the angle between the two laser beams and the angle parameter fed back by the motor. At this time, the value of the calibration scale pointed to by the pointer and the angle parameter fed back by the motor can be compared to determine whether re-debugging and calibration are needed.
[0019] Preferably, the motor is a servo motor.
[0020] By adopting the above technical solution, the rotation angle of the driving pulley can be accurately controlled by using a servo motor, thereby achieving fine control operation of the position of the adjustment frame.
[0021] Preferably, a limit block is provided at one end of the guide rail away from the robotic arm, and a fixing bolt for connecting the guide rail is provided on the limit block.
[0022] By adopting the above technical solution, the limit block prevents the adjustment frame from leaving the guide rail, further improving the safety of the device, and when the device needs to be maintained, the limit block can be removed by fixing the bolts, and then the adjustment frame can be removed for maintenance.
[0023] In summary, the present application includes at least one of the following beneficial technical effects:
[0024] 1. By setting up a mechanical arm, a guide rail, an adjustment frame, a laser welding head, and a synchronous sliding assembly, when changing the angle between the two laser beams, the offset of the intersection position of the two laser beams is avoided as much as possible, and it helps to simplify the control process;
[0025] 2. By setting the rotating shaft, rotating parts, arc rack, sliding block, driving pulley, transmission belt, driven pulley, motor, slide groove and tension spring, it is convenient to control the two adjustment frames to perform synchronous and symmetrical sliding motion;
[0026] 3. By setting the pointer and calibrating the scale, compare the value of the calibration scale pointed by the pointer and the angle parameter of the motor feedback to quickly determine whether re-debugging and calibration is needed. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a structural schematic diagram of a dual-beam laser welding device provided in an embodiment of the present application.
[0028] Figure 2 yes Figure 1 Enlarged view of part A.
[0029] Explanation of the reference numerals in the accompanying drawings: 1. Robotic arm; 11. Guide rail; 111. Drive groove; 112. Limit block; 1121. Fixing bolt; 12. Slide groove; 121. Tension spring; 13. Calibration scale; 2. Adjustment frame; 21. Laser welding head; 3. Synchronous sliding assembly; 31. Rotating part; 311. Slide block; 3111. Driving pulley; 3113. Motor; 3114. Pointer; 312. Transmission belt; 313. Driven pulley; 32. Rotating shaft; 33. Arc rack; 331. Internal rack; 332. External rack; 34. Gear. DETAILED DESCRIPTION
[0030] The following is combined with Figure 1-2 This application is described in further detail.
[0031] The present application embodiment discloses a dual-beam laser welding device. Figure 1 and Figure 2, which includes a robot arm 1, on both sides of which a group of guide rails 11 in the shape of an arc and with the center of the circle coinciding are fixedly and symmetrically arranged. Both guide rails 11 are slidably arranged with an adjustment frame 2, and a laser welding head 21 is fixedly mounted on the adjustment frame 2. A limit block 112 is provided at one end of the guide rail 11 away from the robot arm 1, and a fixing bolt 1121 for connecting the guide rail 11 is provided on the limit block 112, and the adjustment frame 2 slides freely along the guide rail 11 between the limit block 112 and the robot arm 1. The axis of each laser welding head 21 is perpendicular to the normal of the guide rail 11. No matter how the adjustment frame 2 slides, the welding laser emitted by the laser welding head 21 will always pass through the center of the guide rail 11. This means that even if the angle between the two laser welding heads 21 changes, the intersection point of the two laser beams is always stable at the center of the guide rail 11.
[0032] Reference Figure 1 and Figure 2 The robot arm 1 is also equipped with a synchronous sliding assembly 3 to accurately drive a set of adjustment frames 2 to perform synchronous and symmetrical sliding motion relative to the robot arm 1. This simplifies the control process: the synchronous sliding assembly 3 adjusts the angle between the two laser beams, and the robot arm 1 only needs to adjust the welding position and the overall welding angle, which helps to reduce the sensitivity requirements of the robot arm 1, thereby reducing the welding cost.
[0033] In order to drive the synchronous symmetrical sliding of the two adjustment frames 2, refer to Figure 2 The synchronous sliding assembly 3 includes a rotating shaft 32, a gear 34, an arc rack 33 and a rotating member 31, wherein the arc rack 33 is divided into an inner rack 331 and an outer rack 332, and the inner rack 331 and the outer rack 332 have the same module. A driving groove 111 is provided on both guide rails 11, the inner rack 331 is fixed on the inner side wall of one of the driving grooves 111, and the outer rack 332 is fixed on the outer side wall of one of the driving grooves 111. The rotating shaft 32 penetrates and rotates on the guide rail 11 and is coaxially fixed with the gear 34. The gear 34 is meshed with the inner rack 331 or the outer rack 332.
[0034] Reference Figure 2The rotating member 31 includes a sliding block 311, a driving pulley 3111, a transmission belt 312, a driven pulley 313 and a motor 3113, wherein the motor 3113 is a servo motor 3113. A slide slot 12 is provided on the robot arm 1, and the sliding block 311 slides freely in the slide slot 12. A tension spring 121 is provided in the slide slot 12, one end of the tension spring 121 abuts against the sliding block 311, and the other end of the tension spring 121 abuts against the bottom wall of the slide slot 12, and the tension spring 121 drives the sliding block 311 away from the bottom wall of the slide slot 12. The driving pulley 3111 is rotatably arranged on the sliding block 311. The motor 3113 is fixedly mounted on the sliding block 311, and the driving shaft of the motor 3113 passes through the sliding block 311 and is fixedly connected to the driving pulley 3111. The driven pulley 313 is fixedly connected to the rotating shaft 32. Particularly, two transmission belts 312 are simultaneously mounted on the driving pulley 3111 , one of which connects the driving pulley 3111 and one of the driven pulleys 313 , and the other connects the driving pulley 3111 and the other driven pulley 313 .
[0035] Reference Figure 2 When adjusting the angle between the two laser beams, the motor 3113 drives the driving pulley 3111 to rotate, and the two transmission belts 312 transmit the rotation of the driving pulley 3111 to the driven pulleys 313 of the adjustment frames 2 on both sides, and the two rotations rotate in the same direction. One gear 34 meshes with the outer gear 34, and the other gear 34 meshes with the inner gear 34, so that the two adjustment frames 2 perform synchronous reverse sliding motion. However, when the adjustment frame 2 slides on the guide rail 11, the tension spring 121 drives the sliding block 311 to slide, so as to ensure that the transmission belt 312 is tightened between the driving pulley 3111 and the driven pulley 313.
[0036] In order to find and calibrate the deviation of the angle between the two laser beams, refer to Figure 2 , a pointer 3114 is fixedly provided on the sliding block 311, and a calibration scale 13 is fixedly provided on the surface of the robot arm 1, and the pointer 3114 points to the scale line of the calibration scale 13. The operator can compare the feedback parameters of the motor 3113 with the scale pointed by the pointer 3114, and quickly determine whether the angle between the two laser beams is consistent with the feedback parameters of the motor 3113, so as to timely discover and calibrate possible deviations.
[0037] The implementation principle of a dual-beam laser welding device in an embodiment of the present application is as follows: when adjusting the angle between the two laser beams, the motor 3113 drives the active pulley 3111 to rotate, and transmits power to the driven pulleys 313 of the adjustment frames 2 on both sides through the two transmission belts 312, so that the rotation directions of the adjustment frames 2 on both sides are consistent. The gear 34 on the adjustment frame 2 is meshed with the inner rack 331 or the outer rack 332, causing the two adjustment frames 2 to slide synchronously but in opposite directions. During the sliding process, the tension spring 121 ensures that the sliding block 311 moves along the guide rail 11, keeping the transmission belt 312 tight between the active and driven pulleys 313. Regardless of how the adjustment frame 2 moves, the laser emitted by the laser welding head 21 always passes through the center of the guide rail 11. This design ensures that even if the angle of the laser beam changes, its intersection remains at the center of the guide rail 11, simplifying the control process: the motor 3113 accurately adjusts the angle of the two laser beams, and the robot arm 1 only needs to adjust the welding position and welding angle, which helps to reduce the dependence on the sensitivity of the robot arm 1, thereby reducing the welding cost. In summary, the deviation of the laser intersection position is avoided as much as possible, and the control process is further simplified as much as possible.
[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A dual-beam laser welding device, comprising a robotic arm (1), characterized in that: A group of guide rails (11) are fixed and symmetrically arranged on both sides of the mechanical arm (1), the guide rails (11) are arranged in an arc shape with the centers of the circles coinciding, an adjustment frame (2) is slidably arranged on the guide rails (11), a laser welding head (21) is fixedly mounted on the adjustment frame (2), the axis of the laser welding head (21) and the normal of the guide rails (11) are perpendicular to each other, and a synchronous sliding component (3) is arranged on the mechanical arm (1), and the synchronous sliding component (3) is used to drive a group of adjustment frames (2) to perform symmetrical sliding motion relative to the mechanical arm (1).
2. A dual-beam laser welding device according to claim 1, characterized in that: The synchronous sliding assembly (3) comprises a rotating member (31), a rotating shaft (32), an arc rack (33), and a gear (34); a driving groove (111) is provided on the guide rail (11); the arc rack (33) is fixedly arranged on the inner wall of the driving groove (111); the rotating shaft (32) passes through and is rotatably arranged on the guide rail (11); the gear is fixedly arranged on the rotating shaft (32); the gear (34) and the arc rack (33) are meshed with each other; and the rotating member (31) is used to drive the two rotating shafts (32) to rotate simultaneously in the same direction.
3. A dual-beam laser welding device according to claim 2, characterized in that: The arc rack (33) is divided into an inner rack (331) and an outer rack (332); the inner rack (331) is fixed to the inner wall of one of the driving grooves (111); the outer rack (332) is fixed to the outer wall of one of the driving grooves (111); and the modules of the inner rack (331) and the outer rack (332) are equal.
4. A dual-beam laser welding device according to claim 3, characterized in that: The rotating member (31) comprises a sliding block (311), a driving pulley (3111), a transmission belt (312), a driven pulley (313), and a motor (3113); a sliding groove (12) is provided on the mechanical arm (1); the sliding block (311) is slidingly arranged in the sliding groove (12); the driving pulley (3111) is rotatably arranged on the sliding block (311); the motor (3113) is fixedly arranged on the sliding block (311); and the motor (3113) is 3) a driving shaft passes through the sliding block (311) and is fixedly connected to the driving pulley (3111); the driven pulley (313) is fixedly connected to the rotating shaft (32); two transmission belts (312) are sleeved on the driving pulley (3111); one of the transmission belts (312) connects the driving pulley (3111) and one of the driven pulleys (313); and the other transmission belt (312) connects the driving pulley (3111) and the other driven pulley (313).
5. A dual-beam laser welding device according to claim 4, characterized in that: A tensioning spring (121) is arranged in the slide groove (12), one end of the tensioning spring (121) abuts against the sliding block (311), and the other end of the tensioning spring (121) abuts against the bottom wall of the slide groove (12), and the tensioning spring (121) drives the sliding block (311) away from the bottom wall of the slide groove (12).
6. A dual-beam laser welding device according to claim 5, characterized in that: A pointer (3114) is fixedly arranged on the sliding block (311), a calibration scale (13) is fixedly arranged on the surface of the mechanical arm (1), and the pointer (3114) points to the scale of the calibration scale (13).
7. A dual-beam laser welding device according to claim 4, characterized in that: The motor (3113) is a servo motor (3113).
8. A dual-beam laser welding device according to claim 1, characterized in that: A limit block (112) is provided at one end of the guide rail (11) away from the mechanical arm (1), and a fixing bolt (1121) for connecting the guide rail (11) is provided on the limit block (112).