Laser welding device

Abstract

The utility model discloses a laser welding device, and relates to the technical field of welding, the laser welding device comprises a limiting tool, the limiting tool is used for limiting a first to-be-welded piece and a second to-be-welded piece which are in butt joint with each other, so that the first to-be-welded piece and the second to-be-welded piece are kept in a butt joint state suitable for welding; the laser welding gun is arranged on one side of the limiting tool, and the laser welding gun is used for emitting a laser beam to the butt joint part of the first to-be-welded part and the second to-be-welded part so as to carry out laser welding on the first to-be-welded part and the second to-be-welded part; and the height detection element is electrically connected with the laser welding gun, and the height detection element is used for detecting the height distance between the welding end face of the first to-be-welded part and the reference plane so as to guide the laser welding gun to adjust the height of a gun head. According to the technical scheme, the consistency of the welding height can be guaranteed, welding seam deviation is avoided, and the welding precision and the welding seam forming quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, and particularly relates to a laser welding device. Background Art

[0002] At present, arc welding is generally used for welding the shell and the end cover of a compressor, which has problems such as excessive heat output, serious deformation, large consumption of consumables, poor production environment, and low production efficiency. Laser welding has the advantages of concentrated energy, small deformation, high efficiency, and no consumables, and is gradually being applied. However, in actual applications, due to errors in the production of the shell, its height cannot be unified, and the laser welding gun cannot timely adjust its position according to the height change of the shell, resulting in inconsistent welding heights, causing the weld seam to shift, and affecting the welding accuracy and the forming quality of the weld seam. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a laser welding device, aiming to be able to adjust the laser welding position for workpieces to be welded with different heights, ensure the consistency of the welding height, avoid the shift of the weld seam, and improve the welding accuracy and the forming quality of the weld seam.

[0004] To achieve the above purpose, the laser welding device proposed by the utility model includes:

[0005] A positioning fixture, which is used to position the first workpiece to be welded and the second workpiece to be welded that are butt-jointed with each other, so that the first workpiece and the second workpiece maintain a butt-jointed state suitable for welding;

[0006] A laser welding gun, which is arranged on one side of the positioning fixture, and the laser welding gun is used to emit a laser beam to the butt-jointed part of the first workpiece to be welded and the second workpiece to be welded, so as to perform laser welding on the first workpiece and the second workpiece; and

[0007] A height detection element, which is electrically connected to the laser welding gun, and the height detection element is used to detect the height distance between the welding end face of the first workpiece to be welded and a reference plane, so as to guide the laser welding gun to adjust the height of its gun head.

[0008] In an embodiment, the positioning fixture includes:

[0009] A base;

[0010] A positioning mechanism, which is arranged on the base, and the positioning mechanism includes a rotating table and a positioning component arranged on the rotating table, and the positioning component is used to position the first workpiece to be welded on the rotating table;

[0011] The positioning mechanism is provided on the base. The positioning mechanism includes a positioning member that is vertically adjustable and disposed above the rotating table. The positioning member is used to position the second workpiece to be welded at the welding end face of the first workpiece to be welded, and enable the second workpiece to be welded and the first workpiece to be welded to rotate together with the rotating table.

[0012] In one embodiment, the limiting assembly includes a plurality of clamping jaws that are circumferentially spaced along the rotating table. The plurality of clamping jaws enclose to form a receiving space for receiving the end of the first workpiece to be welded, and the plurality of clamping jaws cooperate with each other to tightly hold the outer peripheral surface of the first workpiece to be welded.

[0013] In one embodiment, a flexible member is provided on the clamping side of each clamping jaw.

[0014] In one embodiment, the limiting mechanism further includes a rotation driving member. The rotation driving member is drivingly connected to the rotating table, and the rotation driving member is used to drive the rotating table to rotate.

[0015] In one embodiment, the positioning mechanism further includes a bracket provided on the base, and a lifting driving member provided on the bracket. The lifting driving member is drivingly connected to the positioning member, and the lifting driving member is used to drive the positioning member to perform vertical adjustment. The height detection element is provided on the bracket.

[0016] In one embodiment, the laser welding device further includes a laser cleaning gun. The laser cleaning gun is used to perform laser cleaning on the butt joint portion of the first workpiece to be welded and the second workpiece to be welded.

[0017] In one embodiment, the laser welding device further includes a dust suction mechanism provided on the laser cleaning gun. The dust suction mechanism is used to adsorb the dust generated during the laser cleaning process.

[0018] In one embodiment, the laser welding gun includes a semiconductor laser, a fiber laser, and a laser emitting gun head. The laser emitting gun head is used to combine and emit the first laser beam generated by the semiconductor laser and the second laser beam generated by the fiber laser to perform composite laser welding on the butt joint portion of the first workpiece to be welded and the second workpiece to be welded.

[0019] In one embodiment, the laser welding gun further includes an optical path adjustment structure provided on the optical path of the laser welding gun. The optical path adjustment structure is used to swing the composite laser beam emitted by the laser emitting gun head.

[0020] The technical solution of the present utility model can limit the first workpiece to be welded and the second workpiece to be welded that are butt - jointed through a limiting tooling, so that the first workpiece to be welded and the second workpiece to be welded maintain a butt - joint state suitable for welding; emit a laser beam to the butt - joint part of the first workpiece to be welded and the second workpiece to be welded through a laser welding gun to laser - weld the first workpiece and the second workpiece; and detect the height distance of the welding end face of the first workpiece to be welded (such as a housing) relative to a reference plane through a height detection element to obtain the height information of the first workpiece to be welded. The laser welding gun can timely adjust the height of the gun head relative to the reference plane according to the height information fed back by the height detection element, so as to ensure that when the height of the first workpiece to be welded changes, the height of the gun head of the laser welding gun can also be adjusted accordingly, thereby ensuring that the laser emitted by the laser welding gun can accurately scan to the position to be welded, so as to avoid welding deviation. In this way, the laser welding device can adjust the laser welding position for workpieces to be welded with different heights, ensure the consistency of the welding height, avoid the deviation of the weld seam, and improve the welding precision and the weld seam forming quality. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a schematic structural diagram of an embodiment of a laser welding device provided by the present utility model.

[0023] Explanation of the Reference Numerals in the Drawings:

[0024] 100, laser welding device; 10, limiting tooling; 11, base; 12, limiting mechanism; 121, rotating table; 122, clamping jaw; 123, flexible member; 124, rotation driving member; 13, positioning mechanism; 131, positioning member; 132, bracket; 133, lifting driving member; 20, laser welding gun; 21, semiconductor laser; 22, fiber laser; 23, laser emission gun head; 30, height detection element; 40, laser cleaning gun; 50, dust suction mechanism;

[0025] a, first workpiece to be welded; b, second workpiece to be welded.

[0026] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiment

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0030] Currently, arc welding is generally used for welding the housing and end cover of a compressor, which has problems such as excessive heat output, serious deformation, large consumption of consumables, poor production environment, and low production efficiency. Laser welding has advantages such as concentrated energy, small deformation, high efficiency, and no consumables, and is gradually being applied. However, in actual applications, due to errors in housing production, its height cannot be unified, and the laser welding gun cannot timely adjust its position according to the height change of the housing, resulting in inconsistent welding heights, causing the weld seams to shift, and affecting the welding accuracy and weld seam forming quality.

[0031] The present utility model proposes a laser welding device that can adjust the laser welding position for workpieces to be welded with different heights, ensure the consistency of welding heights, avoid the shift of weld seams, and improve the welding accuracy and weld seam forming quality.

[0032] Please refer to Figure 1 , in an embodiment of the present utility model, the laser welding device 100 includes a limit tooling 10, a laser welding gun 20, and a height detection element 30.

[0033] Among them, the limiting tooling 10 is used to limit the first workpiece to be welded a and the second workpiece to be welded b that are butt-jointed to keep the first workpiece to be welded a and the second workpiece to be welded b in a butt-jointed state suitable for welding. Taking the application of this laser welding device 100 to the welding of a compressor as an example, the first workpiece to be welded a can be the housing of the compressor, and the second workpiece to be welded b can be the end cover of the compressor. Before welding, the end cover is butted against the welding end face of the housing, and the limiting tooling 10 is used to keep their positions relatively fixed, so that the housing and the end cover are kept in a butt-jointed state suitable for welding.

[0034] The laser welding gun 20 is arranged on one side of the limiting tooling 10. The laser welding gun 20 is used to emit a laser beam to the butt-jointed part of the first workpiece to be welded a and the second workpiece to be welded b to laser-weld the first workpiece to be welded a and the second workpiece to be welded b. During welding, a high-energy-density laser beam is emitted by the laser welding gun 20 to the butt-jointed part of the first workpiece to be welded a and the second workpiece to be welded b to melt the workpieces to be welded, forming a specific molten pool, so that the butt-jointed part of the first workpiece to be welded a and the second workpiece to be welded b is welded together. Optionally, the laser welding gun 20 can be mounted on a multi-axis robotic arm, and the position of the laser welding gun 20 can be flexibly adjusted through the multi-axis robotic arm. Among them, the laser welding gun 20 can be used to emit a laser beam of a single wavelength or a composite laser beam with multiple different wavelengths, which is not specifically limited here.

[0035] The height detection element 30 is electrically connected to the laser welding gun 20. The height detection element 30 is used to detect the height distance of the welding end face of the first workpiece to be welded a relative to the reference plane to guide the laser welding gun 20 to adjust the height of the gun head. The height detection element 30 includes but is not limited to sensors such as photoelectric sensors and ultrasonic sensors that can realize distance detection. By using the height detection element 30 to detect the height distance of the welding end face of the first workpiece to be welded a (such as the housing) relative to the reference plane, the height change information of the first workpiece to be welded a can be obtained. Among them, the reference plane can be set according to the actual situation. For example, it can be the bottom surface of the height detection element 30, or it can also be the top surface of the base 11. The height detection element 30 and the laser welding gun 20 can be electrically connected in a wired or wireless manner, so that the height detection element 30 can feedback the detected height information to the laser welding gun 20 in real time, so that the laser welding gun 20 can timely adjust the height of the gun head relative to the reference plane according to the height information feedback by the height detection element 30, so as to ensure that when the height of the first workpiece to be welded a changes, the height of the gun head of the laser welding gun 20 can also be adjusted accordingly, so as to ensure that the laser emitted by the laser welding gun 20 can accurately scan the position to be welded to avoid welding deviation.

[0036] The technical solution of the present utility model can limit the first workpiece to be welded a and the second workpiece to be welded b that are butt - jointed through the limiting tooling 10, so that the first workpiece to be welded a and the second workpiece to be welded b maintain a butt - joint state suitable for welding; emit a laser beam to the butt - joint part of the first workpiece to be welded a and the second workpiece to be welded b through the laser welding gun 20 to laser - weld the first workpiece to be welded a and the second workpiece to be welded b; and detect the height distance of the welding end face of the first workpiece to be welded a (such as a housing) relative to the reference plane through the height detection element 30 to obtain the height information of the first workpiece to be welded a. The laser welding gun 20 can timely adjust the height of the gun head relative to the reference plane according to the height information fed back by the height detection element 30, so as to ensure that when the height of the first workpiece to be welded a changes, the height of the gun head of the laser welding gun 20 can also be adjusted accordingly, thereby ensuring that the laser emitted by the laser welding gun 20 can accurately scan the position to be welded to avoid welding deviation. In this way, the laser welding device 100 can adjust the laser welding position for workpieces to be welded with different heights, ensure the consistency of the welding height, avoid the deviation of the weld seam, and improve the welding precision and the quality of the weld seam formation.

[0037] As Figure 1 shown, in an embodiment, the limiting tooling 10 includes a base 11, and a limiting mechanism 12 and a positioning mechanism 13 both arranged on the base 11. The limiting mechanism 12 includes a rotating table 121 and a limiting component arranged on the rotating table 121. The limiting component is used to limit the first workpiece to be welded a on the rotating table 121; the positioning mechanism 13 includes a positioning member 131 that is arranged above the rotating table 121 and can be adjusted in height. The positioning member 131 is used to position the second workpiece to be welded b on the welding end face of the first workpiece to be welded a, and enable the second workpiece to be welded b and the first workpiece to be welded a to rotate together with the rotating table 121.

[0038] In this embodiment, the cooperation of the limiting mechanism 12 and the positioning mechanism 13 can keep the first workpiece a to be welded and the second workpiece b to be welded in a docking state suitable for welding. The rotating table 121 can support the first workpiece a to be welded, and can also drive the first workpiece a to be welded to rotate. The limiting assembly can fix the first workpiece a to be welded on the rotating table 121 to prevent the first workpiece a from being offset relative to the rotating table 121. Before welding, the first workpiece a to be welded (such as a shell) is fixed to the rotating table 121 through the limiting assembly, and the welding end face of the first workpiece a to be welded is facing upward, and then the second workpiece b to be welded (such as an end cover) is docked with the welding end face of the first workpiece a to be welded. By adjusting the height of the positioning member 131, the positioning member 131 can be pressed against the top surface of the second workpiece b to be welded, so that the positions of the first workpiece a to be welded and the second workpiece b to be welded remain relatively fixed during the welding process, so as to ensure that the welding surfaces of the two always remain parallel, prevent welding deviation, and improve welding accuracy. During welding, a laser beam is emitted to the joint of the first workpiece a and the second workpiece b through the laser welding gun 20. At the same time, the first workpiece a and the second workpiece b are driven to rotate together through the rotating table 121, so that the laser beam emitted by the laser welding gun 20 can sweep across the circumferential surface of the first workpiece a and the second workpiece b, so as to uniformly weld the annular weld at the joint of the two. The rotating table 121 can be driven to rotate automatically by the rotating driving member 124; or the rotating table 121 can also rotate under human drive. The positioning member 131 can be automatically raised and lowered by the lifting driving member 133, or can be manually raised and lowered by a purely mechanical structure (such as a screw).

[0039] like Figure 1 As shown, in one embodiment, the limiting assembly includes a plurality of jaws 122 arranged at circumferential intervals along the rotating table 121, and the plurality of jaws 122 are arranged to form a receiving space for accommodating the end of the first workpiece a to be welded, and the plurality of jaws 122 cooperate with each other to clamp the outer peripheral surface of the first workpiece a to be welded.

[0040] In this embodiment, the outer peripheral surface of the first workpiece to be welded a can be tightly held by the cooperation of multiple clamping jaws 122, so as to limit the circumferential movement of the first workpiece to be welded a. Moreover, the clamping force generated by the cooperation of the multiple clamping jaws 122 can also prevent the first workpiece to be welded a from axially moving. In this way, it can be ensured that during the welding process, both the axial and circumferential displacements of the first workpiece to be welded a can be restricted, and it is ensured that when the first workpiece to be welded a rotates with the rotating table 121, the welding surface of the first workpiece to be welded a will not be skewed. For example, when the first workpiece to be welded a (such as the housing of a compressor) stands upright on the rotating table 121, the first workpiece to be welded a can be tightly held by the cooperation of multiple clamping jaws 122, and the perpendicularity of the first workpiece to be welded a can be adjusted to ensure that the welding surface of the first workpiece to be welded a remains horizontal and avoid skewing. Among them, the number of clamping jaws 122 can be set to two, three, four or more according to needs. Exemplarily, the number of clamping jaws 122 is set to three, and the three clamping jaws 122 are arranged at intervals and evenly along the circumference of the rotating table 121. Each clamping jaw 122 can approach or move away from each other under the action of the driving mechanism to tightly hold or release the first workpiece to be welded a on the rotating table 121.

[0041] To avoid damage to the surface of the first workpiece to be welded a by the clamping jaws 122, optionally, a flexible member 123 is provided on the clamping side of each clamping jaw 122 (that is, the side of the clamping jaw 122 facing the accommodating space). By using the flexible member 123 to block the rigid clamping jaw 122 from the first workpiece to be welded a, a certain buffering effect can be achieved, and it can be avoided that the clamping force of the clamping jaw 122 is too large to damage the surface of the first workpiece to be welded a. Among them, the flexible member 123 includes but is not limited to being made of flexible materials such as rubber and silica gel.

[0042] As Figure 1 shown, in one embodiment, the limiting mechanism 12 further includes a rotary driving member 124, the rotary driving member 124 is drivingly connected to the rotating table 121, and the rotary driving member 124 is used to drive the rotating table 121 to rotate.

[0043] In this embodiment, the rotating table 121 can be automatically driven to rotate by the rotary driving member 124, which can save manpower, and the rotation speed of the rotating table 121 can be automatically controlled by controlling the output rotation speed of the rotary driving member 124 to better adapt to the laser welding process. Among them, the rotary driving member 124 includes but is not limited to a rotary cylinder, a rotary oil cylinder, a motor or other power structures that can output torque.

[0044] As Figure 1As shown, in one embodiment, the positioning mechanism 13 further includes a bracket 132 provided on the base 11, and a lifting driving member 133 provided on the bracket 132. The lifting driving member 133 is drivingly connected to the positioning member 131. The lifting driving member 133 is configured to drive the positioning member 131 to perform lifting adjustment. The height detection element 30 is provided on the bracket 132.

[0045] In this embodiment, the bracket 132 includes a column extending upward from the base 11, and a connecting arm provided at the top of the column and extending horizontally. Both the lifting driving member 133 and the height detection element 30 are fixed to the connecting arm. The driving end of the lifting driving member 133 faces downward. The positioning member 131 is provided at the driving end of the lifting driving member 133. The rotating table 121 is correspondingly arranged below the positioning member 131. By driving the positioning member 131 to perform lifting adjustment through the lifting driving member 133, the distance between the positioning member 131 and the rotating table 121 can be automatically adjusted, which can save labor. Moreover, by controlling the lifting stroke of the lifting driving member 133, the lifting stroke of the positioning member 131 and the pressing force of the positioning member 131 on the second workpiece to be welded can be more precisely controlled to improve the positioning reliability. Among them, the lifting driving member 133 includes, but is not limited to, a cylinder, an oil cylinder, an electric push rod or other power structures capable of outputting a reciprocating linear driving force.

[0046] Generally, to ensure the lubrication of the internal components of the compressor housing, the inner surface of the housing is not allowed to be overly clean. After cleaning, there is still a part of the lubricating medium remaining, resulting in a certain amount of oil stain in the gap between the housing and the end cover, which affects the surface quality of the weld zone between the housing and the end cover.

[0047] To further improve the welding quality, as Figure 1 shown, in one embodiment, the laser welding device 100 further includes a laser cleaning gun 40. The laser cleaning gun 40 is configured to perform laser cleaning on the butt joint portion of the first workpiece to be welded a and the second workpiece to be welded b.

[0048] In this embodiment, before the welding step, the laser cleaning gun 40 can be used to perform pre-welding surface treatment on the butt joint portion of the first workpiece to be welded a (such as the housing) and the second workpiece to be welded b (such as the end cover). The laser cleaning process is a cleaning technology that uses a high-energy laser beam to irradiate the surface of an object, and through optical and thermal effects, impurities, contaminants or coatings are quickly evaporated or peeled off. Through the laser cleaning process, on the one hand, impurities such as surface oil stains and oxides on the first workpiece to be welded a and the second workpiece to be welded b can be removed. On the other hand, through the high temperature generated by laser cleaning, the oil stains in the gap between the first workpiece to be welded a and the second workpiece to be welded b can also be removed, improving the surface quality of the weld zone before welding.

[0049] During the laser cleaning process, certain dust and debris will be generated. If the dust and debris adhere to the surface of the workpiece to be welded, it will affect the cleaning effect and the subsequent laser welding process. In order to remove the dust and debris in a timely manner, as Figure 1 shown, in one embodiment, the laser welding device 100 further includes a dust suction mechanism 50 provided on the laser cleaning gun 40. The dust suction mechanism 50 is used to adsorb the dust and debris generated during the laser cleaning process. In this embodiment, the dust suction mechanism 50 may include a dust suction pipe connected to the laser cleaning gun 40, and a dust suction nozzle provided at one end of the dust suction pipe. When the dust suction mechanism 50 works, a negative pressure is generated in the dust suction pipe, and the dust and debris generated during the laser cleaning process are sucked into the dust suction pipe through the dust suction nozzle, so as to further improve the surface cleanliness of the first workpiece to be welded a and the second workpiece to be welded b, and thus ensure the subsequent laser welding quality.

[0050] In addition, the traditional laser welding process has problems such as large spatter, and the forming quality and production rhythm cannot be synchronized. In order to reduce the spatter during the welding process and ensure the process stability, as Figure 1 shown, in one embodiment, the laser welding gun 20 includes a semiconductor laser 21, a fiber laser 22, and a laser emitting gun head 43. The laser emitting gun head 43 is used to combine and emit the first laser beam generated by the semiconductor laser 21 and the second laser beam generated by the fiber laser 22, so as to perform composite laser welding on the butt joint part of the first workpiece to be welded a and the second workpiece to be welded b.

[0051] In this embodiment, both the semiconductor laser 21 and the fiber laser 22 are arranged at the incident end of the laser emitting gun head 43. During the laser welding process, two laser beams with different wavelengths and energy densities can be generated respectively by the semiconductor laser 21 and the fiber laser 22. The two laser beams are combined by the laser emitting gun and emitted towards the butt joint part of the first workpiece to be welded a and the second workpiece to be welded b, so as to realize composite laser welding. The composite laser can stabilize the molten pool, reduce the spatter during the welding process, and ensure the process stability.

[0052] In one embodiment, the laser welding gun 20 further includes an optical path adjustment structure provided on the optical path of the laser welding gun 20. The optical path adjustment structure is used to swing the composite laser beam emitted by the laser emitting gun head 23.

[0053] In this embodiment, the optical path adjustment structure may be a scanning galvanometer disposed on the optical path of the semiconductor laser 21 and / or the fiber laser 22, causing the scanning galvanometer to swing according to a preset trajectory, so that the first laser beam generated by the semiconductor laser 21 and / or the second laser beam generated by the fiber laser 22 swing, and further causing the composite laser beam emitted by the laser emission gun head 43 to swing. Optionally, the optical path adjustment structure is used to swing the second laser beam emitted by the fiber laser 22, causing the composite laser beam to swing. During welding, the composite laser beam emitted by the laser welding gun 20 swings, and the laser swing process can be used to stir the molten pool, promote the removal of pores in the molten pool, and remove or reduce weld pores. In this way, through the semiconductor and fiber laser composite process and the superimposed composite laser swing process, the combination of the two processes can further improve the stability of the welding process and the weld quality.

[0054] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A laser welding device, characterized in that, Including: A limiting tooling for limiting the first workpiece to be welded and the second workpiece to be welded that are butt-jointed to keep the first workpiece and the second workpiece in a butt-jointed state suitable for welding; A laser welding gun disposed on one side of the limiting tooling, the laser welding gun being used to emit a laser beam to the butt-jointed part of the first workpiece to be welded and the second workpiece to be welded to laser-weld the first workpiece and the second workpiece; and A height detection element electrically connected to the laser welding gun, the height detection element being used to detect the height distance between the welding end face of the first workpiece to be welded and a reference plane to guide the laser welding gun to adjust the height of the gun head.

2. The laser welding device according to claim 1, characterized in that The limiting tooling includes: A base; A limiting mechanism disposed on the base, the limiting mechanism including a rotating table and a limiting component disposed on the rotating table, the limiting component being used to limit the first workpiece to be welded on the rotating table; A positioning mechanism disposed on the base, the positioning mechanism including a positioning member disposed above the rotating table and capable of being adjusted in a lifting manner, the positioning member being used to position the second workpiece to be welded on the welding end face of the first workpiece and enable the second workpiece and the first workpiece to rotate together with the rotating table.

3. The laser welding device according to claim 2, characterized in that, The limiting component includes a plurality of clamping jaws arranged at intervals along the circumference of the rotating table, and the plurality of clamping jaws enclose to form a receiving space for receiving the end of the first workpiece to be welded, and the plurality of clamping jaws cooperate with each other to tightly hold the outer peripheral surface of the first workpiece to be welded.

4. The laser welding device according to claim 3, wherein, A flexible member is provided on the clamping side of each clamping jaw.

5. The laser welding device according to claim 2, characterized in that, The limiting mechanism further includes a rotation driving member drivingly connected to the rotating table, the rotation driving member being used to drive the rotating table to rotate.

6. The laser welding device according to claim 2, characterized in that, The positioning mechanism further includes a bracket disposed on the base and a lifting driving member disposed on the bracket, the lifting driving member being drivingly connected to the positioning member, the lifting driving member being used to drive the positioning member to perform lifting adjustment, and the height detection element is disposed on the bracket.

7. The laser welding device according to claim 1, characterized in that, The laser welding device further includes a laser cleaning gun, the laser cleaning gun being used to perform laser cleaning on the butt-jointed part of the first workpiece to be welded and the second workpiece to be welded.

8. The laser welding device according to claim 7, characterized in that, The laser welding device further includes a dust suction mechanism disposed on the laser cleaning gun, the dust suction mechanism being used to adsorb the dust generated during the laser cleaning process.

9. The laser welding device according to any one of claims 1 to 8, characterized in that, The laser welding gun includes a semiconductor laser, a fiber laser and a laser emitting gun head, the laser emitting gun head being used to combine and emit the first laser beam generated by the semiconductor laser and the second laser beam generated by the fiber laser to perform composite laser welding on the butt-jointed part of the first workpiece to be welded and the second workpiece to be welded.

10. The laser welding device according to claim 9, wherein, The laser welding gun further includes an optical path adjusting structure disposed on the optical path of the laser welding gun, the optical path adjusting structure being used to make the composite laser beam emitted by the laser emitting gun head swing.

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