Automatic laser welding device for stainless steel coil pipe for cooling tower

Abstract

The invention discloses an automatic laser welding device for a stainless steel coil pipe for a cooling tower, and belongs to the technical field of cooling tower coil pipe machining. An automatic laser welding device for a stainless steel coil pipe for a cooling tower comprises a rotary welding station located below a laser welding gun, the rotary welding station comprises a rotary welding frame a rotationally connected with fixing frames at the two ends, and a rotary welding frame b used for positioning the coil pipe to be welded is arranged on the rotary welding frame a; and the rotary welding frame b is rotationally connected with the rotary welding frame a. The device has the beneficial effects that automatic positioning and automatic laser welding of multiple welded junctions of the coil pipe are met, the labor and maintenance cost is saved, and a dangerous source used by manual argon arc welding is avoided.

Description

Technical Field

[0001] The invention relates to an automatic laser welding device for a stainless steel coil pipe for a cooling tower, and belongs to the technical field of cooling tower coil pipe processing. Background Art

[0002] The cooling tower is a device for heat exchange and heat dissipation. The coil inside the cooling tower is the main component of heat exchange and mass transfer in the cooling tower. Its heat dissipation capacity directly affects the overall operation effect of the cooling tower. The stainless steel coil is welded by stainless steel pipes. Its welding quality is related to the decisive role of the cooling tower in achieving heat exchange and heat dissipation effect.

[0003] At present, under the condition of manual argon arc welding, tungsten electrode, argon gas, and flux have dangerous hidden dangers such as radiation, high-frequency electromagnetic field, and harmful gas. The use of welding wire, tungsten electrode, etc. is expensive. In addition, welding is affected by the technical ability of personnel, and there may be incomplete welding, pores, burn-through, and undercuts, resulting in leaks, causing leakage of the internal medium of the coil, greatly affecting the heat exchange and heat dissipation capacity of the cooling tower, causing the cooling tower or user equipment to malfunction, and directly affecting the use of the equipment. There are many welds in the cooling tower coil, and the efficiency of manual argon arc welding is low, and the labor cost is high. Summary of the invention

[0004] In order to solve the defects of the prior art, the purpose of the present invention is to provide an automatic laser welding device for stainless steel coils for cooling towers, which uses a contoured tooling frame to accurately position the stainless steel coils of the cooling tower, flips the positioner through the equipment program setting, and uses a robot to irradiate the high-energy laser pulses emitted by the laser gun head on the weld of the stainless steel pipe for local heating, thereby achieving the effect of melting the welded stainless steel pipe, thereby improving the welding efficiency and welding quality of the stainless steel coils.

[0005] The technical solution of the present invention is: an automatic laser welding device for stainless steel coils for cooling towers, comprising a rotary welding station located below a laser welding gun, wherein the rotary welding station comprises a rotary welding frame a rotatably connected to fixed frames at both ends, a rotary welding frame b for positioning the coils to be welded is provided on the rotary welding frame a, the rotary welding frame a and the rotary welding frame b are driven by rotary motors a and rotary motors b respectively, and the rotary motors a and rotary motors b are controlled by a PLC control system.

[0006] The rotary welding frame b is symmetrically arranged on the rotary welding frame a.

[0007] The laser welding gun is installed on a multi-axis industrial robot, and the multi-axis industrial robot is connected to a PLC control system.

[0008] A chiller is provided on one side of the rotary welding frame a, and the chiller cools down the working laser welding gun through a cold water pipeline. A dust collecting box is provided on the other side of the rotary welding frame a, and a motor for generating negative pressure is provided in the dust collecting box. The dust collecting box is connected to a dust suction pipeline, and the end of the dust suction pipeline extends to the working end of the laser welding gun.

[0009] The rotary welding frame b is provided with mounting plates at both ends, and the mounting plates are provided with a clamping unit for clamping and fixing the straight pipe portion of the coil, and a positioning unit b for positioning the bent pipe portion of the coil. The mounting plates are provided with a tightening unit for tightening the bent pipe portion of the coil, and a positioning unit a for positioning the straight pipe portion is provided between the two mounting plates. A long welding clearance hole is opened on the mounting plates, and the welding clearance long hole is located at the connection between the straight pipe portion and the bent pipe portion.

[0010] The clamping unit includes an upper clamping block and a lower clamping block that are relatively matched with each other. The lower clamping block fixed on the mounting plate is provided with a clamping groove, and a straight pipe portion passes through the clamping groove. Both ends of the upper clamping block are connected to the output end of the clamping cylinder, and the clamping cylinder is connected to the PLC control system. The clamping cylinder is fixed on the mounting plate.

[0011] The positioning unit a comprises a positioning block a fixed on the cross beam, both ends of the cross beam are fixed on the rotary welding frame b, and a plurality of positioning grooves for positioning the straight pipe part are formed on the positioning block a.

[0012] The positioning unit b comprises a positioning block b fixed on the mounting plate, and an arc-shaped positioning groove for positioning the bent pipe portion is formed on the positioning block b.

[0013] The tightening unit comprises a tightening block, which is movably arranged on the mounting plate through a guide rail. A tightening cylinder connected to the PLC control system drives the movement of the tightening block. An arc-shaped positioning tightening groove for accommodating the bent pipe part is opened on the side of the tightening block.

[0014] The mounting plate includes a fixed mounting plate and a movable mounting plate that are relatively arranged. The tightening unit is located on the movable mounting plate. The movable mounting plate is slidably connected to the rotating welding frame b through the slide rails on both sides. A detachable positioning pin is provided on the side of the movable mounting plate. The rotating welding frame b is provided with a positioning groove that cooperates with the positioning pin. The position locking bolt passes through and is threadedly connected to the groove wall on one side of the positioning groove. When the positioning pin is located in the positioning groove, the position locking bolt realizes position locking of the positioning pin and the movable mounting plate by tightening the positioning pin.

[0015] The beneficial effects of the present invention are: meeting the automatic positioning and automatic laser welding of multiple welds in the coil, saving labor and maintenance costs, avoiding the dangerous sources of manual argon arc welding, using a robot to drive the laser welding gun to emit high-energy laser pulses, irradiating the welds of the stainless steel pipes for local heating, achieving the effect of melting and welding the stainless steel pipes, and improving the welding efficiency and welding quality of the stainless steel coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of a rotary welding frame b;

[0018] Figure 3 This is a schematic diagram of welding operation.

[0019] The reference numerals in the figure are as follows: 1. laser welding gun, 2. fixed frame, 3. rotary welding frame a, 4. rotary welding frame b, 5. multi-axis industrial robot, 6. dust collector, 7. slide rail, 8. movable mounting plate, 9. upper clamping block, 10. lower clamping block, 11. clamping cylinder, 12. positioning block a, 13. crossbeam, 14. positioning block b, 15. tightening block, 16. fixed mounting plate, 17. tightening cylinder, 18. chiller. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-3 The present invention is further described:

[0021] An automatic laser welding device for stainless steel coils for cooling towers, comprising a laser welding gun 1 mounted on a multi-axis industrial robot 5, the multi-axis industrial robot 5 being connected to a PLC control system, a rotary welding station being arranged below the laser welding gun 1, the rotary welding station comprising a rotary welding frame a3 being rotatably connected to fixed frames 2 at both ends, a rotary welding frame b4 being arranged on the rotary welding frame a3 for positioning the coils to be welded, the rotary welding frame b4 being symmetrically arranged on the rotary welding frame a3, the rotary welding frame b4 being rotatably connected to the rotary welding frame a3, the rotary welding frame a3 and the rotary welding frame b4 being rotatably connected to the rotary welding frame a3, and the rotary welding frame a3 and the rotary welding frame b4 being rotatably connected to the rotary welding frame a3. The rack b4 is driven by the rotary motor a and the rotary motor b respectively, and the rotary motor a and the rotary motor b are controlled by the PLC control system. The rotary welding rack a3 can rotate to transfer the two rotary welding racks b4 thereon to the welding working area of ​​the laser welding gun 1 in turn. The laser welding gun 1 welds the coils on the rotary welding rack b4 in the welding working area, and the operator can disassemble and assemble the coils of another rotary welding rack b4 at the same time, thereby improving the work efficiency; the rotary welding rack b4 can be automatically flipped, which is convenient for the laser welding gun 1 to weld the coils from both sides. A chiller 18 is provided on one side of the rotary welding frame a3. The chiller 18 cools down the working laser welding gun 1 through a cold water pipeline to avoid the influence of excessive temperature on the normal operation of the laser welding gun 1. A dust box 6 is provided on the other side of the rotary welding frame a3. A motor for generating negative pressure is provided in the dust box 6. The dust box 6 is connected to a dust suction pipeline, and the end of the dust suction pipeline extends to the working end of the laser welding gun 1. The smoke generated during laser welding is absorbed into the dust box 6 through the negative pressure dust suction pipeline to reduce smoke pollution in the welding work area.

[0022] The rotary welding frame b4 is provided with mounting plates at both ends, and the mounting plates are provided with a clamping unit for clamping and fixing the straight pipe part of the coil, and a positioning unit b for positioning the bent pipe part of the coil. The mounting plates are provided with a clamping unit for clamping the bent pipe part of the coil, and a positioning unit a for positioning the straight pipe part is provided between the two mounting plates. A welding clearance long hole is opened on the mounting plate, and the welding clearance long hole is located at the connection between the straight pipe part and the bent pipe part. The laser welding gun 1 welds the connection through the welding clearance long hole.

[0023] The clamping unit includes an upper clamping block 9 and a lower clamping block 10 that cooperate with each other up and down. The lower clamping block 10 fixed on the mounting plate is provided with a clamping groove, and the straight pipe portion passes through the clamping groove. Both ends of the upper clamping block 9 are connected to the output ends of the clamping cylinder 11, and the clamping cylinder 11 is connected to the PLC control system. The clamping cylinder 11 is fixed on the mounting plate. After the position of the coil is determined, the clamping cylinder 11 drives the upper clamping block 9 to move downward and cooperate with the lower clamping block 10 to clamp and fix the straight pipe portion of the coil.

[0024] The positioning unit a includes a positioning block a12 fixed on the crossbeam 13, and both ends of the crossbeam 13 are fixed on the rotary welding frame b4. The positioning block a12 is provided with a plurality of positioning grooves for positioning the straight pipe part. The positioning grooves correspond to the straight pipe part one by one, so that the straight pipe part is placed regularly and can also play a supporting role for the straight pipe part.

[0025] The positioning unit b includes a positioning block b14 fixed on the mounting plate, and an arc-shaped positioning groove for positioning the bent pipe part is opened on the positioning block b14. The shape of the arc-shaped positioning groove is the same as that of the bent pipe part. The bent pipe part is placed in the arc-shaped positioning groove, and the bent pipe part is positioned and supported by the arc-shaped positioning groove.

[0026] The mounting plate includes a fixed mounting plate 16 and a movable mounting plate 8 which are arranged relatively to each other. The tightening unit is located on the movable mounting plate 8. The movable mounting plate 8 is slidably connected to the rotary welding frame b4 through the slide rails 7 on both sides. A detachable positioning pin is provided on the side of the movable mounting plate 8. The rotary welding frame b4 is provided with a positioning groove which cooperates with the positioning pin. The position locking bolt passes through and is threadedly connected to the groove wall on one side of the positioning groove. When the positioning pin is located in the positioning groove, the position locking bolt realizes the position locking of the positioning pin and the movable mounting plate 8 by tightening the positioning pin. The fixing of the coils of different lengths before welding is adapted by the movement of the movable mounting plate 8. The tightening unit includes a tightening block 15, which is movably arranged on the movable mounting plate 8 through a guide rail. The tightening cylinder 17 connected to the PLC control system drives the movement of the tightening block. The side of the tightening block 15 is provided with an arc-shaped positioning tightening groove for accommodating the bent pipe portion. To prevent the straight pipe part and the bent pipe part from loosening, after the straight pipe part is clamped and fixed by the clamping unit, the connection between the straight pipe part and the bent pipe part is tightened by the tightening unit. Specifically, the tightening cylinder 17 drives the tightening block 15 to move toward the straight pipe part, and the arc-shaped positioning tightening groove drives the bent pipe part to tighten toward the straight pipe part. After tightening in place, the welding operation begins.

[0027] Before welding, first determine the use length of the rotary welding frame b4 according to the size of the coil to be welded, adjust the position of the movable mounting plate 8 according to the length, and after adjustment, fix it through the positioning groove and positioning bolts. After adjustment, first plug the bent pipe part into the two ends of the straight pipe part, and then assemble the bent pipe parts at both ends to the positioning block b14 and the tightening block 15 respectively. The straight pipe part is positioned by the positioning block a12, and then the upper tightening block 9 and the lower tightening block 10 cooperate to tighten and fix the coil, and finally tighten the joint of the bent pipe part and the straight pipe part through the tightening block 15, so that the top ends of the bent pipe parts at each end are also collinear. The rotating motor a drives the rotating welding frame a3 to rotate, and moves the rotating welding frame b4 to the welding station. After moving into place, the multi-axis industrial robot 5 drives the laser welding gun 1 to perform laser welding on the joint of the straight pipe part and the bent pipe part. Because there is a welding blind area, the rotating welding frame b needs to rotate by itself to drive the coil to rotate 180 degrees, and the laser welding gun 1 continues to perform the welding operation. After the welding is completed, the rotating welding frame a3 drives the rotating welding frame b4 and the coil thereon on one side to rotate to the non-welding area, and the rotating welding frame b4 on the other side enters the welding operation area to perform the coil welding operation. The rotating welding frame b4 in the non-welding area is disassembled by the operator for the finished product and the assembly of the coil to be welded, and the operation is cyclic.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic laser welding device for stainless steel coils for cooling towers, characterized in that: The invention comprises a rotary welding station located below a laser welding gun (1), wherein the rotary welding station comprises a rotary welding frame a (3) rotatably connected to fixed frames (2) at both ends, a rotary welding frame b (4) for positioning a coil to be welded is arranged on the rotary welding frame a (3), the rotary welding frame b (4) is rotatably connected to the rotary welding frame a (3), the rotary welding frame a (3) and the rotary welding frame b (4) are driven by a rotary motor a and a rotary motor b respectively, and the rotary motor a and the rotary motor b are controlled by a PLC control system.

2. The automatic laser welding device for stainless steel coils for cooling towers according to claim 1 is characterized in that: The rotary welding frame b (4) is symmetrically arranged on the rotary welding frame a (3).

3. The automatic laser welding device for stainless steel coils for cooling towers according to claim 1 is characterized in that: The laser welding gun (1) is installed on a multi-axis industrial robot (5), and the multi-axis industrial robot (5) is connected to a PLC control system.

4. The automatic laser welding device for stainless steel coils for cooling towers according to claim 1 is characterized in that: A water chiller (18) is provided on one side of the rotary welding frame a (3), and the water chiller (18) cools down the laser welding gun (1) in operation through a cold water pipeline. A dust collecting box (6) is provided on the other side of the rotary welding frame a (3), and a motor for generating negative pressure is provided in the dust collecting box (6). The dust collecting box (6) is connected to a dust suction pipeline, and the end of the dust suction pipeline extends to the working end of the laser welding gun (1).

5. The automatic laser welding device for stainless steel coils for cooling towers according to claim 1 is characterized in that: The rotary welding frame b (4) is provided with mounting plates at both ends, the mounting plates are provided with a clamping unit for clamping and fixing the straight pipe portion of the coil, and a positioning unit b for positioning the bent pipe portion of the coil, the mounting plates are provided with a tightening unit for tightening the bent pipe portion of the coil, a positioning unit a for positioning the straight pipe portion is provided between the two mounting plates, and a welding clearance long hole is opened on the mounting plates, and the welding clearance long hole is located at the connection between the straight pipe portion and the bent pipe portion.

6. The automatic laser welding device for stainless steel coils for cooling towers according to claim 5, characterized in that: The clamping unit comprises an upper clamping block (9) and a lower clamping block (10) which are matched with each other in an upper and lower manner. The lower clamping block (10) fixed on the mounting plate is provided with a clamping groove, and a straight pipe portion passes through the clamping groove. Both ends of the upper clamping block (9) are connected to the output end of a clamping cylinder (11), and the clamping cylinder (11) is connected to a PLC control system. The clamping cylinder is fixed on the mounting plate.

7. The automatic laser welding device for stainless steel coils for cooling towers according to claim 5, characterized in that: The positioning unit a comprises a positioning block a (12) fixed on a crossbeam (13), both ends of the crossbeam (13) are fixed on a rotary welding frame b (4), and a plurality of positioning grooves for positioning the straight pipe portion are formed on the positioning block a (12).

8. The automatic laser welding device for stainless steel coils for cooling towers according to claim 5, characterized in that: The positioning unit b comprises a positioning block b (14) fixed on the mounting plate, and an arc-shaped positioning groove for positioning the bent pipe portion is formed on the positioning block b (14).

9. The automatic laser welding device for stainless steel coils for cooling towers according to claim 5, characterized in that: The tightening unit comprises a tightening block (15), which is movably arranged on a mounting plate via a guide rail, and a tightening cylinder (17) connected to a PLC control system drives the movement of the tightening block (15), and an arc-shaped positioning tightening groove for accommodating a bent pipe portion is provided on a side of the tightening block (15).

10. The automatic laser welding device for stainless steel coils for cooling towers according to claim 5, characterized in that: The mounting plate comprises a fixed mounting plate (16) and a movable mounting plate (8) which are arranged opposite to each other. The tightening unit is located on the movable mounting plate (8). The movable mounting plate (8) is slidably connected to the rotary welding frame b (4) via slide rails (7) on both sides. A detachable positioning pin is provided on the side of the movable mounting plate (8). A positioning groove which cooperates with the positioning pin is provided on the rotary welding frame b (4). A position locking bolt passes through and is threadedly connected to a groove wall on one side of the positioning groove. When the positioning pin is located in the positioning groove, the position locking bolt realizes position locking of the positioning pin and the movable mounting plate (8) by tightening the positioning pin.

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