An automated welding auxiliary clamping device

Abstract

The application relates to the field of welding automation, and discloses an automatic welding auxiliary clamping device, which comprises a hydraulic assembly and a fixing support, the hydraulic assembly is fixedly arranged at the bottom of the fixing support, the fixing support is provided with a plurality of hydraulic clamps, the hydraulic clamps are provided with hydraulic oil by the hydraulic assembly, and the hydraulic assembly comprises a hydraulic cylinder, a damper, a locking assembly and a driving reduction box. Compared with the prior art, the application has the advantages that the hydraulic assembly can drive the hydraulic clamps to work, the locking assembly in the hydraulic assembly has self-locking capability, the hydraulic assembly can push and squeeze the hydraulic oil to maintain the clamping force of the clamps during the process that the device carries the workpiece to be transported, the piston and valve core structure in the hydraulic assembly can realize rapid pressure relief of the hydraulic oil, and the working speed can be improved when the workpiece after welding is unloaded.

Description

Technical Field

[0001] This invention relates to the field of welding automation technology, specifically to an automated welding auxiliary clamping device. Background Technology

[0002] Currently, welding equipment has achieved a high degree of automation. Multi-axis positioners and welding robotic arms are typically used in conjunction to achieve three-dimensional welding of workpieces. The automatic loading and unloading of workpieces to be welded is accomplished by an assembly robotic arm placing the workpiece on a fixture. An RGV (Automated Guided Vehicle) or a robotic arm capable of long-distance displacement then transports the fixture to the multi-axis positioner for welding. Because the fixture needs to be transported between multiple devices, it cannot be connected to an external power source for extended periods. Therefore, power clamps cannot be installed on the fixture, making it impossible to achieve stable clamping of the workpiece. In some special cases, after the fixture completes the transport of the workpiece, the workpiece is prone to sliding or tilting, making it difficult for the welding robotic arm to work accurately in subsequent welding operations.

[0003] To ensure that the workpiece does not move during the transfer process, existing RGV vehicles or robotic arms capable of long-distance displacement can only be set to a low moving speed, making it difficult to improve the overall working rate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing automated welding operation methods cannot clamp the workpiece during the transfer process, and the transfer speed is difficult to improve. The present invention provides an automated welding auxiliary clamping device.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: an automated welding auxiliary clamping device, which includes a hydraulic component and a fixed bracket. The hydraulic component is fixedly installed at the bottom of the fixed bracket, and the fixed bracket is provided with multiple hydraulic clamps. The hydraulic clamps are supplied with hydraulic oil by the hydraulic component.

[0006] The hydraulic assembly includes a hydraulic cylinder, a damper, a locking assembly, and a drive reduction gearbox. One end of the hydraulic assembly has a hydraulic pipe interface, and the other end has a vent. The hydraulic cylinder has a damper on the side with the hydraulic pipe interface, and a first guide rod and a third guide rod on the other side. The end of the third guide rod is fixedly connected to the drive reduction gearbox, and a first slider is slidably connected to the third guide rod. The output end of the drive reduction gearbox is powered by a screw, and the screw drives the first slider to move along the axis of the hydraulic cylinder.

[0007] The hydraulic cylinder is equipped with a piston and a floating sealing ring that are axially displaced and connected to a damper through a sliding sleeve. The piston is close to the hydraulic pipe interface, and the floating sealing ring is close to the vent. The piston is hollow inside. Multiple first guide holes are provided on one end of the piston near the hydraulic pipe interface, and multiple second guide holes are provided on the other side. A valve core that can seal the first guide holes is slidably installed inside the piston. A first slider drives the valve core to move.

[0008] Furthermore, the drive reduction gearbox is equipped with a worm gear as the input end and a worm wheel as the output end. A vertically movable connecting claw is slidably connected inside the worm gear, and a first inclined slider is rotatably connected to the top of the connecting claw. The center of the worm wheel is threadedly engaged with the screw.

[0009] Furthermore, the locking assembly includes a drive block and two locking brackets. A second guide rod is provided at the top of the first guide rod. The direction of the first guide rod is parallel to the direction of the hydraulic cylinder axis, and the direction of the second guide rod is perpendicular to the direction of the hydraulic cylinder axis. The drive block is slidably connected to the first guide rod, and the two locking brackets are slidably connected to the two ends of the second guide rod respectively. A second inclined slider that cooperates with the first inclined slider is provided on the outside of the drive block.

[0010] Furthermore, a scissor fork is provided between the two locking brackets. One end of the scissor fork is hinged to the locking bracket, and the other end is slidably connected to the locking bracket. A sliding shaft is provided at the top of the sliding connection between the scissor fork and the locking bracket, and sliding grooves are provided on both sides of the bottom to cooperate with the sliding shaft. The direction of the sliding grooves is parallel to the second guide rod.

[0011] Furthermore, multiple helical springs are provided between the two locking brackets.

[0012] Furthermore, the locking bracket is provided with a friction track on its outer side, and friction blocks that cooperate with the friction track are provided on both sides of the top of the first slider.

[0013] The advantages of this invention compared to the prior art are:

[0014] 1. It has hydraulic components that can drive the hydraulic clamps, and can quickly connect to external power and control the hydraulic oil pressure to drive the hydraulic clamps.

[0015] 2. The locking component in the hydraulic assembly has a self-locking capability, which can lock itself without external power connection, and maintain the pushing of hydraulic oil to maintain the clamping force of the fixture during the process of the device carrying the workpiece for transfer.

[0016] 3. The piston and valve core structure inside the hydraulic assembly enables rapid pressure relief of hydraulic oil, which can increase the working speed when removing the welded workpiece. Attached Figure Description

[0017] Figure 1This is a structural schematic diagram of the present invention in use.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the present invention in conjunction with the workbench for welding workpieces.

[0020] Figure 4 This is a schematic diagram of the connector structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the present invention in operation with a positioner.

[0022] Figure 6 This is a schematic diagram of the external structure of the hydraulic cylinder of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the drive reduction gearbox of the present invention.

[0024] Figure 8 This is a schematic diagram of the locking component of the present invention.

[0025] Figure 9 This is a schematic diagram of the structure of the driving block of the present invention.

[0026] Figure 10 This is a schematic diagram of the internal structure of the hydraulic cylinder of the present invention.

[0027] Figure 11 This is a schematic diagram of the internal structure of the piston of the present invention.

[0028] Figure 12 This is a schematic diagram of the hydraulic cylinder pushing hydraulic oil according to the present invention.

[0029] Figure 13 yes Figure 12 A schematic diagram of the structure at point a.

[0030] Figure 14 This is a schematic diagram of the structure of the hydraulic cylinder when it is locked according to the present invention.

[0031] Figure 15 yes Figure 14 A schematic diagram of the structure at point b.

[0032] Figure 16 This is a schematic diagram of the hydraulic cylinder contact locking mechanism of the present invention.

[0033] Figure 17 This is a schematic diagram of the hydraulic cylinder reset of the present invention.

[0034] As shown in the figure: 1. Hydraulic component, 2. Hydraulic cylinder, 3. Damper, 4. Locking component, 5. Drive gearbox, 6. Connecting claw, 7. Fixed bracket, 8. First workpiece, 9. Second workpiece, 10. Hydraulic clamp, 11. RGV vehicle, 12. Transfer track, 13. Assembly robot arm, 14. Lift, 15. Lifting platform, 16. Motor, 17. Connector, 18. Positioner, 19. Welding robot arm, 20. First guide rod, 21. Second guide rod, 22. Third guide rod. 23. Rod, 24. Hydraulic pipe interface, 25. Vent port, 26. Worm gear, 27. Worm wheel, 28. First inclined plane slider, 29. Drive block, 30. Second inclined plane slider, 31. Screw, 32. First slider, 33. Locking bracket, 34. Scissor fork, 35. Sliding shaft, 36. Helical spring, 37. Friction track, 38. Friction block, 39. Slide groove, 40. Limiting ring, 41. Floating sealing ring, 42. Piston, 43. Valve core, 44. First guide hole, 45. Second guide hole. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Combined with appendix Figure 1 An automated welding auxiliary clamping device includes a hydraulic component 1 and a fixed bracket 7. The hydraulic component 1 is fixedly installed at the bottom of the fixed bracket 7. The fixed bracket 7 is provided with a plurality of hydraulic clamps 10, and the hydraulic clamps 10 are supplied with hydraulic oil by the hydraulic component 1.

[0037] With attachment Figure 1 For reference, the installation position of the hydraulic clamp 10 is set according to the contours of the first workpiece 8 and the second workpiece 9 to be welded, so as to ensure that the first workpiece 8 and the second workpiece 9 can be fully clamped.

[0038] With attachment Figure 5 For reference, the fixed bracket 7 is equipped with quick-connect tooling according to the first workpiece 8 and the second workpiece 9 to be welded and the positioner 18. The quick-connect tooling that cooperates with the positioner 18 is the prior art and will not be described further in this application.

[0039] Combined with appendix Figure 2 Appendix Figure 6 Appendix Figure 7 Appendix Figure 10 and attached Figure 11The hydraulic assembly 1 includes a hydraulic cylinder 2, a damper 3, a locking assembly 4, and a drive reduction gearbox 5. One end of the hydraulic assembly 1 has a hydraulic pipe interface 23, and the other end has a vent 24. The hydraulic cylinder 2 has a damper 3 at one end with the hydraulic pipe interface 23, and a first guide rod 20 and a third guide rod 22 at the other end. The end of the third guide rod 22 is fixedly connected to the drive reduction gearbox 5. A first slider 31 is slidably connected to the third guide rod 22. The output end of the drive reduction gearbox 5 is powered by a screw 30, which drives the first slider 31 to move along the axis of the hydraulic cylinder 2. A damper is slidably fitted inside the hydraulic cylinder 2. The device 3 is connected to a piston 41 and an axially displaceable floating sealing ring 40. The piston 41 is close to the hydraulic pipe interface 23. A limiting ring 39 is provided in the hydraulic cylinder 2 near the hydraulic pipe interface 23. The floating sealing ring 40 is close to the vent 24. The piston 41 is hollow inside. Multiple first guide holes 43 are provided at one end of the piston 41 near the hydraulic pipe interface 23, and multiple second guide holes 44 are provided on the other side. A valve core 42 that can seal the first guide holes 43 is slidably arranged inside the piston 41. The first slider 31 drives the valve core 42 to move. In the above structure, the cavity between the floating sealing ring 40 and the hydraulic pipe interface 23 is filled with hydraulic oil.

[0040] Combined with appendix Figure 7 The drive reduction gearbox 5 is equipped with a worm gear 25 as the input end and a worm wheel 26 as the output end, with the center of the worm wheel 26 threadedly engaged with the screw 30.

[0041] The working principle of the above components is as follows:

[0042] Combined with appendix Figure 10 Appendix Figure 11 and attached Figure 12 When hydraulic oil needs to be supplied to the hydraulic clamp 10 for clamping, the rotating connecting claw 6 drives the first slider 31 through the screw 30, causing the valve core 42 to move towards the first guide hole 43. Since the piston 41 is connected to the damper 3, the movement of the piston 41 is damped accordingly. At this time, the valve core 42 will not drive the piston 41 to move. When the valve core 42 contacts the inner wall surface of the piston 41 on the side with the first guide hole 43 and seals the first guide hole 43, the movement of the valve core 42 drives the piston 41 to move in the same direction. Since the first guide hole 43 is sealed in this state, the hydraulic oil is pushed by the piston 41 into the hydraulic pipeline interface 23 and delivered to each hydraulic clamp 10. At the same time, since the floating sealing ring 40 seals the space between the vent port 24 and the piston 41, the hydraulic oil in the piston 41 pulls the floating sealing ring 40 to move in the same direction. External air enters the hydraulic cylinder 2 through the vent port 24 and finally moves to the attached Figure 14 In the state shown, the piston 41 and valve core 42 jointly push the hydraulic oil to reach the clamping pressure of the hydraulic clamp 10.

[0043] Combined with appendix Figure 10 Appendix Figure 11 and attached Figure 16 When it is necessary to discharge the hydraulic oil in the hydraulic clamp 10 to release the clamp, the rotating connecting claw 6 drives the first slider 31 through the screw 30, causing the valve core 42 to move towards the second guide hole 44. Similarly, due to the damping of the movement of the piston 41, the piston 41 remains stationary when the valve core 42 moves. After the valve core 42 moves a certain distance, the seal on the first guide hole 43 is released. At this time, the first guide hole 43 and the second guide hole 44 are in a connected state. Since the side of the floating sealing ring 40 in contact with the air is connected to the external atmosphere, it maintains an atmospheric pressure. The hydraulic oil pressure under the clamping pressure is greater than the atmospheric pressure. Driven by the pressure difference, it enters the hydraulic cylinder 2 through the hydraulic pipe interface 23 and pushes the floating sealing ring 40 through the first guide hole 43 and the second guide hole 44 to discharge the air in the hydraulic cylinder 2 through the vent port 24. The hydraulic oil pressure continuously decreases and eventually drops to an atmospheric pressure, and the hydraulic clamp 10 reaches a relaxed state.

[0044] The present invention achieves rapid pressure relief of hydraulic cylinder 2 and hydraulic clamp 10 through the above structure, enabling rapid release of clamping. During this process, valve core 42 only undergoes a short displacement, while piston 41 remains stationary. After hydraulic clamp 10 loosens and removes the workpiece, it assembles a new workpiece for processing. At this time, piston 41 and valve core 42 are close to the limiting ring 39, and cannot move a sufficient distance when clamping a new workpiece. The stroke of piston 41 and valve core 42 is limited and cannot provide sufficient hydraulic power. It is necessary to reset piston 41 and valve core 42 to a state away from the limiting ring 39.

[0045] Combined with appendix Figure 10 Appendix Figure 11 and attached Figure 17 When the piston 41 needs to be reset, the rotating connecting claw 6 drives the first slider 31 through the screw 30, causing the valve core 42 to move towards the second guide hole 44. The valve core 42 contacts the inner wall of the piston 41 and drives the piston 41 to move in the same direction. The first guide hole 43 and the second guide hole 44 are in a connected state. Since the piston 41 moves relative to the hydraulic oil, the hydraulic oil flows through the first guide hole 43 and the second guide hole 44 to the cavity between the piston 41 and the hydraulic pipe interface 23.

[0046] Combined with appendix Figure 6 Appendix Figure 7 Appendix Figure 8 and attached Figure 9The locking assembly 4 includes a drive block 28 and two locking brackets 32. A second guide rod 21 is provided at the top of the first guide rod 20. The direction of the first guide rod 20 is parallel to the axis of the hydraulic cylinder 2, and the direction of the second guide rod 21 is perpendicular to the axis of the hydraulic cylinder 2. The drive block 28 is slidably connected to the first guide rod 20. The two locking brackets 32 are slidably connected to the two ends of the second guide rod 21 respectively. A vertically movable connecting claw 6 is slidably connected inside the worm gear 25. A first inclined slider 27 is rotatably connected to the top of the connecting claw 6. A second inclined slider 29 that cooperates with the first inclined slider 27 is provided on the outside of the drive block 28. When the first inclined slider 27 moves vertically upward, the second inclined slider 29 is driven to displace the drive block 28 away from the hydraulic cylinder 2.

[0047] Combined with appendix Figure 8 Multiple helical springs 35 are provided between the two locking brackets 32, and friction rails 36 are provided on the outer side of the locking brackets 32. Friction blocks 37 that cooperate with the friction rails 36 are provided on both sides of the top of the first slider 31.

[0048] The coil spring 35 pushes the locking bracket 32 ​​outward, causing the friction track 36 to contact the friction block 37. The friction between the friction track 36 and the friction block 37 brakes and locks the first slider 31. In this state, the locking assembly 4 can be referred to the appendix. Figure 15 .

[0049] Combined with appendix Figure 8 and attached Figure 9 A scissor fork 33 is provided between the two locking brackets 32. One end of the scissor fork 33 is hinged to the locking bracket 32, and the other end is slidably connected to the locking bracket 32. A sliding shaft 34 is provided at the top of the sliding connection between the scissor fork 33 and the locking bracket 32, and sliding grooves 38 that cooperate with the sliding shaft 34 are provided on both sides of the bottom. The direction of the sliding grooves 38 is parallel to the second guide rod 21.

[0050] When the drive block 28 moves away from the hydraulic cylinder 2, the slide groove 38 pulls the sliding shaft 34, causing the scissor fork 33 to retract inward. This, in turn, causes the locking bracket 32 ​​to move inward against the force of the coil spring 35, preventing the friction track 36 from contacting the friction block 37. The first slider 31 can then move. (Refer to the attached diagram for details.) Figure 13 .

[0051] Combined with appendix Figure 1 Appendix Figure 3 and attached Figure 4 For the welding workpiece assembly workbench, a lifting platform 14 is set on the outside of the whole device. The lifting platform 15 drives the motor 16 to lift and lower, ensuring that the connector 17 is below the connecting claw 6.

[0052] When it is necessary to clamp or release the workpiece, the control lift 14 causes the motor 16 to rise. After the connector 17 rises, it forms a power connection and drives the connecting claw 6 to move upward synchronously. After rising, it drives the drive block 28 and the locking bracket 32 ​​to separate the friction track 36 from the friction block 37, allowing the first slider 31 to move freely. In this state, the control motor 16 drives the connector 17 to rotate the connecting claw 6 to control the hydraulic clamp 10.

[0053] When the workpiece needs to be transferred to the welding station after assembly, the hydraulic clamp 10 clamps the workpiece to be welded using the above method. After clamping, the lifting platform 14 is controlled to lower the connector 17, the helical spring 35 pushes the locking bracket 32 ​​outward and causes the friction track 36 to contact the friction block 37, thereby locking the first slider 31. At this time, the hydraulic cylinder 2 maintains the attachment Figure 14 In the state shown, since the first slider 31 is locked, the piston 41 and valve core 42 cannot be displaced, which allows the hydraulic oil of the hydraulic cylinder 2 and the hydraulic clamp 10 to always maintain the clamping pressure.

[0054] The workflow of this invention is as follows:

[0055] The fixed bracket 7 is placed on top of the RGV vehicle 11. The RGV vehicle 11 travels on the transfer track 12 to the assembly robot arm 13. The assembly robot arm 13 places the first workpiece 8 and the second workpiece 9 to be welded on the fixed bracket 7 and assembles them into the welding positions. After assembly, the elevator 14 lifts the motor 16, causing the connector 17 to release the locking component 4 and rotate the connecting claw 6 to control the hydraulic clamp 10 to clamp the first workpiece 8 and the second workpiece 9. After clamping, the elevator 14 drives the motor 16 to descend and automatically locks to maintain the clamping of the hydraulic clamp 10. The RGV vehicle 11 carries the fixed bracket 7 and the first workpiece 8 and the second workpiece 9 to the positioner 18 and connects the fixed bracket 7 to the positioner 18. After connection, the RGV vehicle 11 leaves, and the positioner 18 moves the fixed bracket 7 and the first workpiece 8 and the second workpiece 9 to the welding robot arm 19 and cooperates with the welding robot arm 19 to perform welding work.

[0056] The present invention and its embodiments have been described above. This description is not restrictive, and the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the scope of protection of this invention.

Claims

1. An automated welding auxiliary clamping device, comprising a hydraulic assembly (1), a fixed bracket (7), and an RGV vehicle (11), wherein the hydraulic assembly (1) is fixedly disposed at the bottom of the fixed bracket (7), the fixed bracket (7) is provided with a plurality of hydraulic clamps (10), the hydraulic clamps (10) are supplied with hydraulic oil by the hydraulic assembly (1), and the fixed bracket (7) is placed on top of the RGV vehicle (11) for transport, characterized in that: The hydraulic assembly (1) includes a hydraulic cylinder (2), a damper (3), a locking assembly (4), and a drive reduction gearbox (5). One end of the hydraulic assembly (1) is provided with a hydraulic pipe interface (23), and the other end is provided with a vent (24). The hydraulic cylinder (2) is provided with a damper (3) on one side near the hydraulic pipe interface (23), and a first guide rod (20) and a third guide rod (22) on the other side. The end of the third guide rod (22) is fixedly connected to the drive reduction gearbox (5). A first slider (31) is slidably connected on the third guide rod (22). The output end of the drive reduction gearbox (5) is connected to a screw (30). The screw (30) drives the first slider (31) to move along the axis of the hydraulic cylinder (2). The hydraulic cylinder (2) is slidably fitted with a piston (41) connected to the damper (3) and a floating sealing ring (40) that can be displaced along the axial direction. The floating sealing ring (40) is close to the vent (24). The piston (41) is hollow inside. The piston (41) is provided with multiple first guide holes (43) at one end near the hydraulic pipeline interface (23) and multiple second guide holes (44) at the other side. A valve core (42) that can seal the first guide holes (43) is slidably fitted inside the piston (41). The first slider (31) drives the valve core (42) to move.

2. The automated welding auxiliary clamping device according to claim 1, characterized in that: The drive reduction gearbox (5) is provided with a worm (25) as the input end and a worm wheel (26) as the output end. A vertically movable connecting claw (6) is slidably connected inside the worm (25). A first inclined slider (27) is rotatably connected to the top of the connecting claw (6). The center of the worm wheel (26) is threadedly engaged with the screw (30).

3. The automated welding auxiliary clamping device according to claim 2, characterized in that: The RGV vehicle (11) is equipped with a lift (14) at both the starting point and the ending point. The lift (14) drives the lifting platform (15) to move vertically. The lifting platform (15) is equipped with a motor (16), and the power end of the motor (16) is equipped with a connector (17) that cooperates with the connecting claw (6).

4. The automated welding auxiliary clamping device according to claim 2, characterized in that: The locking assembly (4) includes a drive block (28) and two locking brackets (32). The bottom of the first guide rod (20) is provided with a second guide rod (21). The direction of the first guide rod (20) is parallel to the axis of the hydraulic cylinder (2), and the direction of the second guide rod (21) is perpendicular to the axis of the hydraulic cylinder (2). The drive block (28) is slidably connected to the first guide rod (20). The two locking brackets (32) are slidably connected to both ends of the second guide rod (21). The outer side of the drive block (28) is provided with a second inclined slider (29) that cooperates with the first inclined slider (27).

5. The automated welding auxiliary clamping device according to claim 4, characterized in that: A scissor fork (33) is provided between the two locking brackets (32). One end of the scissor fork (33) is hinged to the locking bracket (32), and the other end is slidably connected to the locking bracket (32). A sliding shaft (34) is provided at the top of the sliding connection between the scissor fork (33) and the locking bracket (32). The bottom sides of the drive block (28) are provided with sliding grooves (38) that cooperate with the sliding shaft (34). The direction of the sliding grooves (38) is parallel to the second guide rod (21).

6. The automated welding auxiliary clamping device according to claim 4, characterized in that: Multiple helical springs (35) are provided between the two locking brackets (32).

7. An automated welding auxiliary clamping device according to claim 4, characterized in that: The locking bracket (32) has a friction track (36) on its outer side, and the first slider (31) has friction blocks (37) on both sides of its top that cooperate with the friction track (36).

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