Laser welding device for annular pipe fittings

Abstract

The invention relates to the technical field of laser welding, and discloses an annular pipe fitting laser welding device which comprises a bottom plate, an electric sliding rail is fixedly connected to the upper surface of the bottom plate, a moving column is fixedly connected to the sliding end of the electric sliding rail, and a laser welding head is rotationally connected to the left side of the moving column; a fixing mechanism is arranged on the upper surface of the bottom plate, a discharging mechanism is arranged on the back face of the movable column, and a cooling mechanism is arranged on the upper surface of the bottom plate. The fixing mechanism comprises a motor, a rotary table and a fixing ring, the motor is fixedly connected to the lower surface of the bottom plate, a worker can place a steel pipe on the side away from a laser welding head firstly, then the steel pipe is rotated through the motor, the operation risk of the worker is effectively reduced, machining continuity is achieved, and meanwhile when welding is prepared, the welding efficiency is improved. The device can press the pressure plate to unfold the arc-shaped supporting plate, so that the workpiece is stably fixed, and the welding stability is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a laser welding device for annular pipe fittings. Background Art

[0002] Laser welding is a welding method that uses a laser beam as an energy source to bombard the heat generated by the weldment; due to the optical properties of the laser such as refraction and focusing, laser welding is very suitable for welding of micro-parts and parts with very poor accessibility; when laser welding an annular pipe fitting, an auxiliary mechanism that can assist laser welding is required to better complete the welding task of the annular steel pipe.

[0003] The patent with the publication number CN215545805U discloses a laser welding device for annular pipe fittings, including a base, two symmetrically arranged welding frames are provided on the base, through holes are provided on the welding frames, a rotating pipe is connected to the through holes through bearings, a three-jaw chuck is provided at one end of the rotating pipe, an external gear is provided at the other end of the rotating pipe, a gear shaft is connected between the two welding frames through bearings, the external gear meshes with the gear shaft, and an annular handle is fixedly connected to the side of the external gear away from the welding frame; this laser welding auxiliary device for annular pipe fitting welding has a simple structure and is easy to operate. By rotating the annular handle, the two sections of annular pipe fittings to be welded rotate smoothly and synchronously, while the welding head does not move, and the welding accuracy is high, the efficiency is fast, and the welding effect is good.

[0004] However, this device requires workers to assist in the operation beside it, and the welding area is relatively close to the workers. Therefore, it is easy for workers to be scalded by welding slag during welding. At the same time, it is difficult for this device to accurately place the workpiece to be processed on the welding working surface, and there is also a problem that it is difficult to support the annular steel pipe as a whole. Therefore, a laser welding device for annular pipe fittings is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a laser welding device for annular pipe fittings aiming at the deficiencies in the above-mentioned prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A laser welding device for annular pipe fittings, comprising a bottom plate. A motorized slide rail is fixedly connected to the upper surface of the bottom plate. A moving column is fixedly connected to the sliding end of the motorized slide rail. A laser welding head is rotatably connected to the left side of the moving column. A fixing mechanism is arranged on the upper surface of the bottom plate. A blanking mechanism is arranged on the back surface of the moving column. A cooling mechanism is arranged on the upper surface of the bottom plate. The fixing mechanism includes: a motor, a turntable, and a fixing ring. The motor is fixedly connected to the lower surface of the bottom plate. The lower surface of the turntable is fixedly connected to the output end of the motor. The fixing ring is fixedly connected to the upper surface of the turntable, enabling the welding part of the device to be away from the workers. The workers can first place the steel pipe on the side far from the laser welding head and then rotate it through the motor, effectively reducing the operation risk for the workers and achieving continuous processing. The fixing mechanism further includes: a first fixing column, a moving ring, an arc-shaped support plate, a pressing plate, and an elastic telescopic column pressing plate. The lower surface of the first fixing column is fixedly connected to the upper surface of the turntable. The upper surface of the moving ring is fixedly connected to the inner wall of the first fixing column through a spring. The arc-shaped support plate is rotatably connected to the circumferential surface of the first fixing column through a rotating rod. The lower surface of the pressing plate is fixedly connected to the upper surface of the moving ring through a long rod. The front surface of the elastic telescopic column pressing plate is fixedly connected to the back surface of the moving column. The inner wall of the moving ring contacts the circumferential surface of the first fixing column. The arc-shaped support plate is rotatably connected to the moving ring. The long rod on the lower surface of the pressing plate slides in the inner wall of the first fixing column. When preparing for welding, the device can press the pressing plate to expand the arc-shaped support plate and firmly fix the workpiece to ensure stability during welding.

[0007] Preferably, the blanking mechanism includes: a first support plate, a hook, a second support plate, a limiting plate, a pushing plate, and a pushing column. The front surface of the first support plate is fixedly connected to the back surface of the moving column. The upper end of the hook is fixedly connected to the lower surface of the first support plate. The hook is composed of a hook head, an arc-shaped block, and a long rod. The hook head is rotatably connected to the arc-shaped block. The long rod is fixedly connected to the upper surface of the arc-shaped block. The right side of the second support plate is fixedly connected to the left side of the first support plate. The upper surface of the limiting plate is fixedly connected to the lower surface of the second support plate. The pushing plate is fixedly connected to the left side of the limiting plate through a spring. The lower end of the pushing column is fixedly connected to the upper surface of the turntable. Manual material handling may cause problems such as position deviation and collision of the steel pipe during placement due to factors such as operator fatigue, different levels of operation proficiency, and inconsistent force control. Moreover, the workpiece just processed has a high temperature and is inconvenient to handle. However, this device can avoid these problems. It can rotate counterclockwise to the material taking position by the motor, automatically pick up the steel pipe at an accurate position through the hook, and push it into the blanking box. The blanking mechanism further includes: a second fixed column, a blanking box, a third support plate, and a first pressing rod. The lower end of the second fixed column is fixedly connected to the upper surface of the bottom plate. The back surface of the blanking box is fixedly connected to the front end of the second fixed column. The left side of the third support plate is fixedly connected to the right side of the first support plate. The upper end of the first pressing rod is fixedly connected to the lower surface of the third support plate. The circumferential surface of the pushing plate contacts the inner wall of the limiting plate. The first pressing rod contacts the upper surface of the rotating rod at the bottom of the blanking box. This device can slowly lower the steel pipe in the blanking box to prevent the steel pipe from being knocked and causing deformation of the workpiece.

[0008] Preferably, the cooling mechanism includes: a fan group, a water bucket, a condensing pipe, and a heat dissipation box. The fan group is installed on the upper surface of the bottom plate. The water bucket is fixedly connected to the upper surface of the bottom plate, and a water pumping component is included on the back of the water bucket. The condensing pipe is connected to the water pumping component of the water bucket and the water inlet hole. The lower surface of the heat dissipation box is fixedly connected to the upper surface of the bottom plate, enabling the device to dissipate heat during the welding process. After the welding is completed, the steel pipe will absorb a large amount of heat, causing the temperature of the weld and its surrounding area to rise, leading to material expansion. If the weld is not cooled in time after welding, as the temperature naturally decreases, the weld will deform due to uneven shrinkage. Cooling can quickly remove heat, enabling the weld to cool in a relatively short time, reducing the heat-affected time, and thus effectively reducing the possibility of weld deformation. The cooling mechanism further includes: a fixing plate, a connecting rod one, a pressing rod two, a bent rod, and an L-shaped rod. The lower surface of the fixing plate is fixedly connected to the bottom of the inner wall of the heat dissipation box. The connecting rod one is rotatably connected to the front of the fixing plate through a torsion spring. A knocking hammer is fixedly connected to the front of the connecting rod one. The upper end of the pressing rod two is fixedly connected to the circumferential surface of the pressing rod one. The L-shaped rod is rotatably connected to the front of the fixing plate. The front of the bent rod is fixedly connected to the back of the L-shaped rod. The circumferential surface of the pressing rod two contacts the upper surface of the bent rod. The lower surface of the bent rod is connected to the upper surface of the bottom of the heat dissipation box through a spring. The circumferential surface of the cylinder of the L-shaped rod contacts the lower surface of the connecting rod one. The vibration generated by knocking helps the gas to escape from the molten pool, reducing the formation of pores. During the welding process, some gases, such as hydrogen, may be dissolved in the molten pool. When the molten pool solidifies, if these gases cannot escape in time, pores will be formed. Vibration can also make the slag float better on the surface of the molten pool, avoiding slag inclusion defects.

[0009] The present invention adopts the above technical solutions and can bring the following beneficial effects: 1. For the laser welding auxiliary device for circular pipe fittings, through the mutual cooperation among the motor, the turntable, the fixed ring, the fixed column one, the moving ring, the arc-shaped support plate, the pressing disc, and the elastic telescopic column pressing plate, the welding part of the device can be far away from the worker, reducing the occurrence of the phenomenon that the worker is scalded by the splashing welding slag. The worker can first place the steel pipe on the side far from the laser welding head and then turn it through the motor, effectively reducing the operation risk of the worker. Moreover, the processing continuity is achieved. At the same time, when preparing for welding, the device can press the pressing disc to expand the arc-shaped support plate and fix the workpiece stably to ensure stability during welding.

[0010] 2. The laser welding auxiliary device for welding annular pipe fittings, through the mutual cooperation among the first support plate, the hook claw, the second support plate, the limiting plate, the push plate, the push column, the second fixing column, the blanking box, the third support plate, and the first pressing rod, manual material handling may, due to factors such as operator fatigue, different levels of operation proficiency, and inconsistent force control, result in position deviation, collision, etc. of the steel pipe during placement. Moreover, the workpiece just processed has a very high temperature and is inconvenient to handle. However, this device can avoid these problems. It can rotate counterclockwise to the material taking position by the motor, automatically pick up the steel pipe at an accurate position through the hook claw, and push it into the blanking box. At the same time, this device can slowly lower the steel pipe in the blanking box to prevent the steel pipe from being knocked and causing deformation of the workpiece.

[0011] 3. The laser welding auxiliary device for welding annular pipe fittings, through the mutual cooperation among the fan group, the water bucket, the condensation pipe, the heat dissipation box, the fixing plate, the first connecting rod, the second pressing rod, the bent rod, and the L-shaped rod, enables this device to dissipate heat during the welding process. After welding, the steel pipe will absorb a large amount of heat, and the temperature of the weld and the surrounding area will rise, resulting in material expansion. If it is not cooled in time after welding, as the temperature naturally decreases, the weld will deform due to uneven shrinkage. Cooling can quickly remove the heat, enabling the weld to cool in a relatively short time, reducing the heat affected time, and thus effectively reducing the possibility of weld deformation. At the same time, the vibration generated by knocking helps the gas to escape from the molten pool, reducing the formation of pores. During the welding process, some gases, such as hydrogen, may be dissolved in the molten pool. When the molten pool solidifies, if these gases cannot escape in time, they will form pores. Vibration can also make the slag better float to the surface of the molten pool, avoiding slag inclusion defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the bottom plate structure of the present invention; Figure 3 is a schematic diagram of the fixing mechanism of the present invention; Figure 4 is a schematic diagram of the blanking mechanism of the present invention; Figure 5 of the present invention Figure 4 is an enlarged view of the structure at A in; Figure 6 is a schematic diagram of the blanking box structure of the present invention; Figure 7 is a schematic diagram of the cooling mechanism of the present invention; Figure 8 is a cross-sectional view of the heat dissipation box structure of the present invention.

[0013] In the figure: 1, bottom plate; 2, electric slide rail; 3, moving column; 4, laser welding head; 5, fixing mechanism; 51, motor; 52, turntable; 53, fixing ring; 54, first fixing column; 55, moving ring; 56, arc-shaped support plate; 57, pressing plate; 58, elastic telescopic column pressing plate; 6, blanking mechanism; 61, first support plate; 62, hook; 63, second support plate; 64, limiting plate; 65, pushing plate; 66, pushing column; 67, second fixing column; 68, blanking box; 69, third support plate; 610, first pressing rod; 7, cooling mechanism; 71, fan group; 72, water bucket; 73, condensation pipe; 74, heat dissipation box; 75, fixing plate; 76, first connecting rod; 77, second pressing rod; 78, bent rod; 79, L-shaped rod. Detailed implementation manners

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1 - 8, an embodiment of the present invention is: a laser welding device for annular pipe fittings, including a bottom plate 1, an electric slide rail 2 is fixedly connected to the upper surface of the bottom plate 1, a moving column 3 is fixedly connected to the sliding end of the electric slide rail 2, and a laser welding head 4 is rotatably connected to the left side of the moving column 3; a fixing mechanism 5 is arranged on the upper surface of the bottom plate 1, a blanking mechanism 6 is arranged on the back surface of the moving column 3, and a cooling mechanism 7 is arranged on the upper surface of the bottom plate 1; the fixing mechanism 5 includes: a motor 51, a turntable 52, and a fixing ring 53. The motor 51 is fixedly connected to the lower surface of the bottom plate 1, the lower surface of the turntable 52 is fixedly connected to the output end of the motor 51, and the fixing ring 53 is fixedly connected to the upper surface of the turntable 52. The fixing mechanism 5 further includes: a first fixing column 54, a moving ring 55, an arc-shaped support plate 56, a pressing plate 57, and an elastic telescopic column pressing plate 58. The lower surface of the first fixing column 54 is fixedly connected to the upper surface of the turntable 52, the upper surface of the moving ring 55 is fixedly connected to the inner wall of the first fixing column 54 through a spring, the arc-shaped support plate 56 is rotatably connected to the circumferential surface of the first fixing column 54 through a rotating rod, the lower surface of the pressing plate 57 is fixedly connected to the upper surface of the moving ring 55 through a long rod, and the front surface of the elastic telescopic column pressing plate 58 is fixedly connected to the back surface of the moving column 3. The inner wall of the moving ring 55 is in contact with the circumferential surface of the first fixing column 54, the arc-shaped support plate 56 is rotatably connected to the moving ring 55, and the long rod on the lower surface of the pressing plate 57 slides in the inner wall of the first fixing column 54. When the device is started, the worker installs the steel pipe on the turntable 52 at one end of the turntable 52 away from the laser welding head 4, and the steel pipe is initially fixed inside the fixing ring 53. The electric slide rail 2 located on the bottom plate 1 drives the moving column 3, the moving column 3 drives the laser welding head 4, and the laser welding head 4 welds the steel pipe located on the turntable 52, so that the welding part of the device can be far away from the worker. The worker can first place the steel pipe on the side away from the laser welding head 4 and then turn it through the motor 51, effectively reducing the operation risk of the worker and realizing the processing continuity. When the moving column 3 moves down to prepare for welding the steel pipe, the moving column 3 drives the elastic telescopic column pressing plate 58 to move downward, and the elastic telescopic column pressing plate 58 presses the pressing plate 57 downward. The pressing plate 57 drives the moving ring 55 to move downward on the circumferential surface of the first fixing column 54. The connecting rod above the moving ring 55 does not move, and the connecting rod at the bottom of the moving ring 55 moves downward. At this time, the connecting rod at the bottom of the moving ring 55 extends from an inclined state to a horizontal state, and the moving ring 55 drives the arc-shaped support plate 56 to open, and the arc-shaped support plate 56 tightens the steel pipe. When reaching a certain strength, the telescopic rod in the elastic telescopic column pressing plate 58 contracts to prevent the force of expanding the steel pipe from being too large, so that the device fixes the workpiece stably and ensures stability during welding.

[0016] Working principle: When the device starts, the worker installs the steel pipe on the turntable 52 at one end far from the laser welding head 4. The steel pipe is initially fixed by being stuck inside the fixed ring 53. The electric slide rail 2 located on the bottom plate 1 drives the moving column 3, the moving column 3 drives the laser welding head 4, and the laser welding head 4 performs laser welding on the steel pipe located on the turntable 52, enabling the welding part of the device to be far from the worker. The worker can first place the steel pipe on the side far from the laser welding head 4 and then rotate it through the motor 51, effectively reducing the operation risk for the worker and achieving continuous processing. When the moving column 3 moves down to prepare for laser welding of the steel pipe, the moving column 3 drives the elastic telescopic column pressing plate 58 to move downward. The elastic telescopic column pressing plate 58 presses the pressing plate 57 downward. The pressing plate 57 drives the moving ring 55 to move downward along the circumference of the first fixed column 54. The connecting rod above the moving ring 55 remains stationary, and the connecting rod at the bottom of the moving ring 55 moves downward. At this time, the connecting rod at the bottom of the moving ring 55 extends from an inclined shape to a horizontal shape, and the moving ring 55 drives the arc-shaped support plate 56 to expand. The arc-shaped support plate 56 tightens the steel pipe. When reaching a certain force, the telescopic rod inside the elastic telescopic column pressing plate 58 contracts to prevent the force for expanding the steel pipe from being too large, enabling the device to fix the workpiece stably and ensuring stability during laser welding.

[0017] Please refer to Figures 1 - 8, on the basis of the above embodiments, in another embodiment of the present invention, the blanking mechanism 6 includes: a first support plate 61, a hook 62, a second support plate 63, a limiting plate 64, a push plate 65, and a push column 66. The front surface of the first support plate 61 is fixedly connected to the back surface of the moving column 3. The upper end of the hook 62 is fixedly connected to the lower surface of the first support plate 61. The hook 62 is composed of a hook head, an arc-shaped block, and a long rod. The hook head is rotatably connected to the arc-shaped block, and the long rod is fixedly connected to the upper surface of the arc-shaped block. The right side of the second support plate 63 is fixedly connected to the left side of the first support plate 61. The upper surface of the limiting plate 64 is fixedly connected to the lower surface of the second support plate 63. The push plate 65 is fixedly connected to the left side of the limiting plate 64 through a spring. The lower end of the push column 66 is fixedly connected to the upper surface of the turntable 52. The blanking mechanism 6 further includes: a second fixed column 67, a blanking box 68, a third support plate 69, and a first pressing rod 610. The lower end of the second fixed column 67 is fixedly connected to the upper surface of the bottom plate 1. The back surface of the blanking box 68 is fixedly connected to the front end of the second fixed column 67. The left side of the third support plate 69 is fixedly connected to the right side of the first support plate 61. The upper end of the first pressing rod 610 is fixedly connected to the lower surface of the third support plate 69. The circumferential surface of the push plate 65 is in contact with the inner wall of the limiting plate 64. The first pressing rod 610 is in contact with the upper surface of the rotating rod at the bottom of the blanking box 68. When the device finishes processing the previous workpiece, the motor 51 rotates counterclockwise. The motor 51 drives the turntable 52 to send the processed steel pipe to the lower part of the blanking mechanism 6 on the right. When the laser welding head 4 processes the next workpiece, the moving column 3 moves downward, driving the first support plate 61 to move downward. The first support plate 61 moves downward, driving the hook 62 to move downward. Due to the special structure of the hook 62, the hook 62 moves downward to hook up the processed workpiece. After the laser welding head 4 finishes processing the workpiece, the moving column 3 moves upward, driving the first support plate 61 to move upward. The first support plate 61 moves upward, driving the hook 62 to move upward. The hook 62 lifts the processed workpiece. When the motor 51 continues to rotate and sends another processed workpiece to the lower part of the blanking mechanism 6, the turntable 52 drives the push column 66 to rotate. The push column 66 pushes the semi-circular block on the push plate 65 to move rightward within the limiting plate 64. The arc-shaped push plate on the right side of the push plate 65 pushes the head of the workpiece lifted by the hook 62, causing the workpiece to be pushed into the blanking box 68. This process repeats. Manual material handling may cause problems such as position deviation and collision of the steel pipe during placement due to factors such as operator fatigue, different levels of operation proficiency, and inconsistent force control. Moreover, the just-processed workpiece is very hot and inconvenient to handle. However, this device can avoid these problems. It can rotate counterclockwise according to the motor 51 to reach the material-taking position, automatically pick up the steel pipe at an accurate position through the hook 62, and push it into the blanking box 68. The downward movement of the first support plate 61 drives the third support plate 69 to move downward. The downward movement of the third support plate 69 drives the first pressing rod 610 to move downward. The first pressing rod 610 moves downward to press the long rod at the bottom of the blanking box 68 downward, slowly releasing the steel pipe in the blanking box 68. When the first pressing rod 610 lifts, the long rod on the lower surface of the blanking box 68 returns to its original position through the torsion spring, preventing the steel pipe from being knocked and deformed.

[0018] The cooling mechanism 7 includes: a fan group 71, a water bucket 72, a condensing pipe 73, and a heat dissipation box 74. The fan group 71 is installed on the upper surface of the bottom plate 1. The water bucket 72 is fixedly connected to the upper surface of the bottom plate 1, and the back of the water bucket 72 is provided with a water pumping component. The condensing pipe 73 is connected to the water pumping component of the water bucket 72 and the water inlet hole. The lower surface of the heat dissipation box 74 is fixedly connected to the upper surface of the bottom plate 1. The cooling mechanism 7 further includes: a fixing plate 75, a first connecting rod 76, a second pressing rod 77, a bent rod 78, and an L-shaped rod 79. The lower surface of the fixing plate 75 is fixedly connected to the bottom of the inner wall of the heat dissipation box 74. The first connecting rod 76 is rotatably connected to the front of the fixing plate 75 through a torsion spring. A knocking hammer is fixedly connected to the front of the first connecting rod 76. The upper end of the second pressing rod 77 is fixedly connected to the circumferential surface of the first pressing rod 610. The L-shaped rod 79 is rotatably connected to the front of the fixing plate 75. The front of the bent rod 78 is fixedly connected to the back of the L-shaped rod 79. The circumferential surface of the second pressing rod 77 contacts the upper surface of the bent rod 78. The lower surface of the bent rod 78 is connected to the upper surface of the bottom of the heat dissipation box 74 through a spring. The circumferential surface of the cylinder of the L-shaped rod 79 contacts the lower surface of the first connecting rod 76. When the fan in the fan group 71 starts, it cools the steel pipe in the heat dissipation box 74. The water flow in the water bucket 72 is pumped out by the water pump on the back of the water bucket 72 and circulates in the condensing pipe 73. The water in the condensing pipe 73 circulates back into the water bucket 72, enabling the device to dissipate heat during the welding process. After welding, the steel pipe will absorb a large amount of heat, causing the temperature of the weld and its surrounding area to rise, resulting in material expansion. If the steel pipe is not cooled in time after welding, as the temperature naturally decreases, the weld will deform due to uneven contraction. Cooling can quickly remove heat, enabling the weld to cool in a relatively short time, reducing the heat-affected time, and thus effectively reducing the possibility of weld deformation. When the first pressing rod 610 moves downward, it drives the second pressing rod 77 to move downward. The second pressing rod 77 moving downward drives the bent rod 78 to move downward. The bent rod 78 moving downward drives the L-shaped rod 79 to rotate around the fixing plate 75. The rotation of the L-shaped rod 79 drives the first connecting rod 76 to rotate. The rotation of the first connecting rod 76 can knock the steel pipe during the process of falling into the heat dissipation box 74. The vibration generated by the knocking helps the gas to escape from the molten pool, reducing the formation of pores. During the welding process, some gases, such as hydrogen, may be dissolved in the molten pool. When the molten pool solidifies, if these gases cannot escape in time, they will form pores. Vibration can also make the slag float better on the surface of the molten pool, avoiding slag inclusion defects.

[0019] Working principle: When the device finishes processing the previous workpiece, the motor 51 rotates counterclockwise. The motor 51 drives the turntable 52 to send the processed steel pipe to the lower part of the blanking mechanism 6 on the right. When the laser welding head 4 processes the next workpiece, the moving column 3 moves downward, driving the first support plate 61 to move downward. The first support plate 61 moving downward drives the claw 62 to move downward. Due to the special structure of the claw 62, when the claw 62 moves downward, it hooks up the processed workpiece. After the laser welding head 4 finishes processing the workpiece, the moving column 3 moves upward, driving the first support plate 61 to move upward. The first support plate 61 moving upward drives the claw 62 to move upward, and the claw 62 lifts the processed workpiece. When the motor 51 continues to rotate and sends another processed workpiece to the lower part of the blanking mechanism 6, the turntable 52 drives the push column 66 to rotate. The push column 66 pushes the semi-circular block on the push plate 65 to move rightward within the limit plate 64. The arc-shaped push plate on the right side of the push plate 65 pushes the head of the workpiece lifted by the claw 62, causing the workpiece to be pushed into the blanking box 68. This process repeats. Manual material handling may lead to problems such as position deviation and collision of the steel pipe during placement due to factors such as operator fatigue, different levels of operation proficiency, and inconsistent force control. Moreover, the just-processed workpiece is very hot and inconvenient to handle. However, this device can avoid these problems. It can rotate counterclockwise according to the motor 51 to the material-taking position, automatically pick up the steel pipe at an accurate position through the claw 62, and push it into the blanking box 68. The downward movement of the first support plate 61 drives the downward movement of the third support plate 69. The downward movement of the third support plate 69 drives the downward movement of the first pressure rod 610. The downward movement of the first pressure rod 610 presses the long rod at the bottom of the blanking box 68 downward, slowly lowering the steel pipe in the blanking box 68. When the first pressure rod 610 lifts, the long rod on the lower surface of the blanking box 68 is reset by the torsion spring to prevent the steel pipe from being knocked and deformed.

[0020] The fan inside the fan group 71 starts to cool down the steel pipe in the heat dissipation box 74. The water flow in the water bucket 72 is pumped out by the water pump on the back of the water bucket 72 and circulates in the condensation pipe 73. The water in the condensation pipe 73 circulates back into the water bucket 72, enabling the device to dissipate heat during the welding process. After welding, the steel pipe will absorb a large amount of heat, causing the temperature of the weld and the surrounding area to rise, leading to material expansion. If the steel pipe is not cooled in time after welding, as the temperature naturally decreases, the weld will deform due to uneven contraction. Cooling can quickly remove heat, enabling the weld to cool within a relatively short time, reducing the heat-affected time, and thus effectively reducing the possibility of weld deformation. The downward movement of the first pressure rod 610 drives the downward movement of the second pressure rod 77. The downward movement of the second pressure rod 77 drives the downward movement of the bent rod 78. The downward movement of the bent rod 78 drives the L-shaped rod 79 to rotate around the fixed plate 75. The rotation of the L-shaped rod 79 drives the rotation of the first connecting rod 76. The rotation of the first connecting rod 76 can strike the steel pipe during the process of falling into the heat dissipation box 74. The vibration generated by the striking helps the gas to escape from the molten pool, reducing the formation of pores. During the welding process, some gases, such as hydrogen, may dissolve in the molten pool. When the molten pool solidifies, if these gases cannot escape in time, they will form pores. The vibration can also make the slag float better on the surface of the molten pool, avoiding slag inclusion defects.

[0021] The present invention provides a laser welding device for annular pipe fittings. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented by using the prior art.

Claims

1. A laser welding device for annular pipe fittings, comprising a bottom plate, characterized in that: A motorized slide rail is fixedly connected to the upper surface of the bottom plate. A moving column is fixedly connected to the sliding end of the motorized slide rail. A laser welding head is rotatably connected to the left side of the moving column. A fixing mechanism is arranged on the upper surface of the bottom plate. A blanking mechanism is arranged on the back surface of the moving column. A cooling mechanism is arranged on the upper surface of the bottom plate. The fixing mechanism includes: a motor, a turntable, and a fixing ring. The motor is fixedly connected to the lower surface of the bottom plate. The lower surface of the turntable is fixedly connected to the output end of the motor. The fixing ring is fixedly connected to the upper surface of the turntable.

2. The laser welding device for an annular pipe fitting according to claim 1, wherein: The fixing mechanism further includes: a first fixing column, a moving ring, an arc-shaped support plate, a pressing plate, and an elastic telescopic column pressing plate. The lower surface of the first fixing column is fixedly connected to the upper surface of the turntable. The upper surface of the moving ring is fixedly connected to the inner wall of the first fixing column through a spring. The arc-shaped support plate is rotatably connected to the circumferential surface of the first fixing column through a rotating rod. The lower surface of the pressing plate is fixedly connected to the upper surface of the moving ring through a long rod. The front surface of the elastic telescopic column pressing plate is fixedly connected to the back surface of the moving column.

3. The laser welding device for an annular pipe fitting according to claim 2, characterized in that: The inner wall of the moving ring contacts the circumferential surface of the first fixing column. The arc-shaped support plate is rotatably connected to the moving ring. The long rod on the lower surface of the pressing plate slides in the inner wall of the first fixing column.

4. The laser welding device for an annular pipe fitting according to claim 3, wherein: The blanking mechanism includes: a first support plate, a hook, a second support plate, a limiting plate, a pushing plate, and a pushing column. The front surface of the first support plate is fixedly connected to the back surface of the moving column. The upper end of the hook is fixedly connected to the lower surface of the first support plate. The hook consists of a hook head, an arc-shaped block, and a long rod. The hook head is rotatably connected to the arc-shaped block. The long rod is fixedly connected to the upper surface of the arc-shaped block. The right side of the second support plate is fixedly connected to the left side of the first support plate. The upper surface of the limiting plate is fixedly connected to the lower surface of the second support plate. The pushing plate is fixedly connected to the left side of the limiting plate through a spring. The lower end of the pushing column is fixedly connected to the upper surface of the turntable.

5. The laser welding device for an annular pipe fitting according to claim 4, wherein: The blanking mechanism further includes: a second fixing column, a blanking box, a third support plate, and a first pressing rod. The lower end of the second fixing column is fixedly connected to the upper surface of the bottom plate. The back surface of the blanking box is fixedly connected to the front end of the second fixing column. The left side of the third support plate is fixedly connected to the right side of the first support plate. The upper end of the first pressing rod is fixedly connected to the lower surface of the third support plate.

6. The laser welding device for an annular pipe fitting according to claim 5, wherein: The circumferential surface of the pushing plate contacts the inner wall of the limiting plate. The first pressing rod contacts the upper surface of the rotating rod at the bottom of the blanking box.

7. The laser welding device for an annular pipe fitting according to claim 6, wherein: The cooling mechanism includes: a fan group, a water bucket, a condensing pipe, and a heat dissipation box. The fan group is installed on the upper surface of the bottom plate. The water bucket is fixedly connected to the upper surface of the bottom plate, and a water pumping component is included on the back surface of the water bucket. The condensing pipe is communicated with the water pumping component of the water bucket and the water inlet hole. The lower surface of the heat dissipation box is fixedly connected to the upper surface of the bottom plate.

8. A laser welding device for an annular pipe fitting according to claim 7, characterized in that: The cooling mechanism further includes: a fixing plate, a first connecting rod, a second pressing rod, a bent rod, and an L-shaped rod. The lower surface of the fixing plate is fixedly connected to the bottom of the inner wall of the heat dissipation box. The first connecting rod is rotatably connected to the front surface of the fixing plate through a torsion spring. A knocking hammer is fixedly connected to the front surface of the first connecting rod. The upper end of the second pressing rod is fixedly connected to the circumferential surface of the first pressing rod. The L-shaped rod is rotatably connected to the front surface of the fixing plate. The front surface of the bent rod is fixedly connected to the back surface of the L-shaped rod.

9. The laser welding device for an annular pipe fitting according to claim 8, wherein: The circumferential surface of the second pressure rod contacts the upper surface of the bent rod. The lower surface of the bent rod is connected to the upper surface of the bottom of the heat dissipation box by a spring. The circumferential surface of the cylinder of the L-shaped rod contacts the lower surface of the first connecting rod.

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