Thermal management compact laser welding head

Abstract

The invention relates to a thermal management compact type laser welding head, belongs to the technical field of laser welding, and solves the problem that a laser welding head in the prior art is inconvenient to dissipate heat, the laser welding head comprises a shell, an input end and an output end are arranged on the shell, the input end is connected with a laser generator, and a collimating mirror assembly is arranged in the input end; a focusing mirror assembly is arranged in the output end, a reflecting mirror assembly is arranged in an inner cavity of the shell, a laser beam is collimated through the collimating mirror assembly, then is emitted to the focusing mirror assembly through the reflecting mirror assembly, is focused through the focusing mirror assembly and then is emitted out to weld a workpiece to be welded, and a liquid cooling unit and an air cooling unit are integrated on the welding head. The liquid cooling unit cools the collimator assembly and the focus lens assembly, and the air cooling unit cools the reflector assembly and cools the laser welding spots, so that the use effect of the laser welding head is guaranteed, the problem that the temperature of the laser welding head is too high is avoided, and the practicability of the laser welding head is improved.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and more specifically, to a compact laser welding head with thermal management. Background Technology

[0002] Laser welding is a method of welding workpieces using a high-energy-density laser beam as a heat source. Laser welding utilizes laser radiation to heat the workpiece surface, and the heat diffuses from the surface inwards through heat conduction, melting the workpiece and achieving the welding purpose. In the laser welding process, a laser beam is typically emitted from a laser welding head onto the workpiece surface to complete the welding operation.

[0003] In existing technologies, laser welding heads contain a lens assembly. The laser beam passes through the lens assembly and is then emitted for welding. Various types of existing laser welding heads exist. For example, Chinese patent CN109175564A discloses a laser soldering head, which includes a lens barrel, a laser input assembly, a camera, and an adapter tube. The laser input assembly emits a laser beam into the lens barrel, and the camera monitors the soldering status and welding position of the product within the adapter tube through the lens barrel. In this welding head, a first focusing lens is installed inside the lens barrel, and a connecting sleeve is provided at one end of the lens barrel. One end of the connecting sleeve is connected to... The washer is located at the end of the connecting sleeve away from the first focusing lens. The laser input assembly includes a laser input tube and a laser, a collimating lens installed in the laser input tube, and a reflecting mirror installed in the lens tube. The reflecting mirror is set corresponding to the collimating lens and the first focusing lens, so that the parallel laser passing through the collimating lens can be totally reflected onto the first focusing lens. During operation, the laser emitted by the laser is focused into parallel light after passing through the collimating lens. The parallel light is emitted to the first focusing lens after passing through the reflecting mirror. After the first focusing lens, it is focused into a point in the nozzle, thereby heating and melting the workpiece to achieve welding operation.

[0004] Although the aforementioned laser welding head can focus the laser to heat and melt the workpiece to achieve welding, it still has the following defects in actual use.

[0005] During laser welding, the high-energy-density laser beam passes through optical lens components such as focusing lenses and collimating lenses. Due to the high energy density of the laser beam, the optical lens components overheat significantly after prolonged use, making them susceptible to damage due to ineffective heat dissipation. This renders the laser welding head unusable, causing inconvenience to laser welding operations.

[0006] To address this issue, the present invention provides a compact laser welding head with thermal management. The optical lens assembly inside the dry welding head can dissipate heat and cool down through a dual gas-liquid medium, thereby ensuring the performance of the laser welding head. Summary of the Invention

[0007] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the invention, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0008] To address the technical problem of ineffective heat dissipation in existing laser welding heads, the present invention adopts the following technical solution.

[0009] A compact laser welding head with thermal management includes a housing and an input end and an output end disposed on the housing. An inner cavity is provided inside the housing, and a reflector assembly is installed within the cavity. A laser generator is connected to the input end, and a collimating lens assembly is installed within the input end. A focusing lens assembly is installed within the output end. The laser beam generated by the laser generator is collimated by the collimating lens assembly in the input end to produce a parallel laser beam. The reflector assembly in the inner cavity reflects the parallel laser beam to the output end, where it is focused by the focusing lens assembly and then emitted for laser welding. The laser welding head also includes a liquid cooling unit, in which a liquid cooling medium flows to cool the collimating lens assembly and the focusing lens assembly.

[0010] Preferably, in the above-mentioned compact laser welding head, the liquid cooling unit includes a spirally arranged liquid cooling channel, which is integrated in the housing and arranged around the collimating lens assembly. The liquid cooling channel is provided with a liquid cooling medium interface and a liquid cooling medium outlet. The liquid cooling medium enters the liquid cooling channel through the liquid cooling medium interface to cool the collimating lens assembly and then exits from the liquid cooling medium outlet.

[0011] Preferably, in the above-mentioned compact laser welding head, the liquid cooling unit includes a spirally arranged liquid cooling channel, which is integrated in the housing and arranged around the focusing lens assembly. The liquid cooling channel is provided with a liquid cooling medium interface and a liquid cooling medium outlet. The liquid cooling medium enters the liquid cooling channel through the liquid cooling medium interface to cool the focusing lens assembly and then exits from the liquid cooling medium outlet.

[0012] Preferably, in the above-mentioned compact laser welding head, the liquid cooling unit includes a spirally arranged liquid cooling channel, which is integrated in the housing and surrounds the collimating lens assembly and the focusing lens assembly respectively. The housing is also provided with a connecting end, which is provided with a liquid cooling medium interface. The liquid cooling channel on the collimating lens assembly is connected to the liquid cooling medium interface on the connecting end through a connecting pipe I. The liquid cooling channel at the collimating lens assembly is connected to the liquid cooling channel at the focusing lens assembly through a connecting pipe II. The output end is provided with a liquid cooling medium outlet, which is connected to the liquid cooling channel at the focusing lens assembly. The liquid cooling medium enters the liquid cooling channel through the liquid cooling medium interface, dissipates heat from the collimating lens assembly and the focusing lens assembly respectively, and then flows out through the liquid cooling medium outlet on the output end.

[0013] Preferably, in the above-mentioned compact laser welding head, the laser welding head further includes an air cooling unit, which includes an air cooling medium interface and an air cooling channel. The air cooling medium interface is located on the connection end, and the air cooling channel is connected to the air cooling medium interface. Furthermore, a spray port is provided at the bottom of the housing, and the air cooling channel is connected to the spray port. The air cooling medium enters the air cooling channel through the air cooling medium interface and is sprayed out through the spray port to cool and reduce the temperature of the laser welding point.

[0014] Preferably, in the above-mentioned compact laser welding head, the nozzle is inclined, and the inclined direction of the nozzle is towards the laser focusing point.

[0015] Preferably, in the above-mentioned compact laser welding head, the gas cooling medium interface is connected to the inner cavity of the housing, the gas cooling channel is connected to the inner cavity, and the gas cooling medium enters the inner cavity through the gas cooling medium interface to cool the reflector assembly in the housing, and then enters the jet nozzle and is ejected, thereby cooling the laser welding point.

[0016] Preferably, in the above-mentioned compact laser welding head, the liquid cooling unit further includes a liquid cooling channel disposed on the connection end. The liquid cooling channel is spirally disposed inside the connection end, and the liquid cooling channel is disposed around the outside of the gas cooling medium interface for cooling the gas cooling medium entering the gas cooling medium interface.

[0017] Preferably, in the above-mentioned compact laser welding head, a temperature sensor and a solenoid valve are also installed in the spray nozzle. The solenoid valve is connected to the spray nozzle on one side and to a return channel on the other side. The return channel is connected to the air-cooling medium interface. The temperature sensor detects the temperature of the air-cooling medium in real time. When the temperature meets the preset threshold, the solenoid valve sprays the air-cooling medium from the spray nozzle. When the temperature of the air-cooling medium exceeds the preset threshold, the solenoid valve returns the air-cooling medium from the return channel to the air-cooling medium interface and cools it through the liquid cooling medium in the liquid cooling channel in the connection end.

[0018] Preferably, in the above-mentioned compact laser welding head, the reflector assembly includes two reflectors located in the inner cavity. One reflector is positioned relative to the collimating lens assembly and is tilted at an angle of 45°. The other reflector is positioned relative to the focusing lens assembly and is parallel to it, with the reflective surfaces of the reflectors facing each other.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The laser welding head of the present invention includes a housing, an input end, and an output end. The input end is equipped with a laser generator and a collimating lens assembly, and the output end is equipped with a focusing lens assembly. A reflecting mirror assembly is installed in the inner cavity of the housing. The laser beam generated by the laser generator passes through the collimating lens assembly to generate a parallel laser beam, which is reflected by the reflecting mirror assembly and then focused by the focusing mirror assembly at the output end before being emitted to weld the workpiece. To avoid the problem of excessive heat in the laser welding head, the laser welding head of the present invention integrates a liquid cooling unit. The liquid cooling unit is a spiral liquid cooling channel that surrounds the collimating lens assembly and / or the focusing lens assembly. The liquid cooling medium in the liquid cooling channel cools the collimating lens assembly and / or the focusing lens assembly, thus avoiding the problem of excessive heat in the laser welding head.

[0020] 2. The laser welding head of this invention also integrates a gas cooling unit, which includes a gas cooling channel. Gas medium enters the gas cooling channel and enters the housing to cool the reflector assembly, further preventing the laser welding head from overheating. The laser welding head also has a spray nozzle; gas medium enters through the gas cooling channel and is ejected from the nozzle to cool the laser weld point, improving the cooling rate and ensuring the efficiency of laser welding. Additionally, a spiral liquid cooling channel is provided on the outer side of the gas cooling medium interface on the housing, cooling the gas medium through the liquid cooling channel and reducing the temperature drop of the gas cooling medium. The initial temperature of the gas ensures the cooling effect of the gas cooling medium. In addition, the nozzle is equipped with a solenoid valve and a temperature sensor. The temperature sensor monitors the temperature of the gas medium in real time. When the temperature of the gas medium is too high, it enters the gas cooling medium interface through the return channel for cooling again, ensuring the cooling effect. This avoids the problem of excessive temperature of the laser welding head and ensures the cooling effect of the laser weld joint, improving the efficiency of the laser welding head. Furthermore, the liquid cooling unit and the gas cooling unit in this invention are integrated into the laser welding head to form a compact laser welding head, which is beneficial to the use of the laser welding head and improves its practicality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the compact laser welding head in this invention; Figure 2 for Figure 1 The front view; Figure 3 for Figure 1 A sectional view; Figure 4 This is a diagram showing the laser beam path of the compact laser welding head in this invention; Figure 5 This is a diagram showing the flow path of the liquid cooling medium in this invention; Figure 6 This is a schematic diagram of the back structure of the compact laser welding head in this invention; Figure 7 This is a diagram showing the flow of the air-cooling medium in this invention.

[0022] The correspondence between the reference numerals and component names in the attached drawings is as follows.

[0023] 100. Shell; 101. Connection terminal; 102. Input terminal; 103. Output terminal; 100a, Inner cavity; 100b, Jet nozzle; 100c, Reflector; 100d, Collimating lens assembly; 100e, Focusing lens assembly; 200. Liquid cooling unit; 201. Liquid cooling medium interface; 202. Liquid cooling channel; 202a, Connecting pipe I; 202b, Connecting pipe II; 300, Air-cooled unit; 301. Air-cooled medium interface; 302. Air-cooled aisle; 303. Return aisle. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] like Figure 1 as well as Figure 2 As shown, this is a structural schematic diagram of the compact laser welding head in this embodiment. The compact laser welding head in this embodiment is used to emit a laser beam. After the laser beam passes through the optical lens assembly inside the laser welding head for refraction and focusing, the laser beam is focused. Since the laser beam has a high energy density, after the laser beam is focused on the workpiece to be welded, it can heat and melt the workpiece to be welded, thereby completing the welding purpose.

[0027] like Figure 1 as well as Figure 2 As shown, the compact laser welding head in this embodiment includes a housing 100, with an inner cavity 100a inside the housing 100. An optical lens assembly is installed in the inner cavity 100a. The housing 100 in this embodiment also has an input terminal 102 and an output terminal 103, as shown below. Figure 1 As shown, a laser generator is installed on the input end 102. The laser generator generates a laser beam. The laser beam undergoes refraction, reflection and focusing processes in the inner cavity 100a of the housing 100, so that the laser beam is focused and output from the output end 103 to complete the welding operation of the workpiece to be welded.

[0028] like Figure 3 as well as Figure 4 As shown, the optical lens assembly in this embodiment includes a collimating lens assembly 100d, a focusing lens assembly 100e, and a reflecting mirror 100c, all installed in the inner cavity 100a. Figure 4 As shown, in this embodiment, a collimating lens assembly 100d is installed in the input terminal 102, and a laser generator is installed in the input terminal 102. The laser generator generates a laser beam. After passing through the collimating lens assembly 100d, the laser beam is refracted by the collimating lens assembly 100d to generate a parallel laser beam. When the parallel laser beam reaches the reflecting mirror 100c, it is over-reflected and then reaches the output terminal 103. In this embodiment, a focusing lens assembly 100e is installed in the output terminal 103. After passing through the focusing lens assembly 100e in the output terminal 103, the parallel laser beam is focused on the surface of the workpiece to be welded. After being focused, the laser beam converges on the surface of the workpiece to be welded, thereby heating the workpiece to be welded, thereby melting the workpiece to complete the welding operation.

[0029] like Figure 4As shown, this is a diagram illustrating the laser beam path in this embodiment. In this embodiment, two reflectors 100c are installed inside the housing 100. One reflector 100c is positioned relative to the collimating lens assembly 100d and is tilted. The tilt angle is preferably 45°. In this embodiment, the tilt angle refers to the angle between the reflector 100c and the parallel laser beam passing through the collimating lens assembly 100d. In this embodiment, the other reflector 100c is positioned relative to the focusing lens assembly 100e in the output end 103 and is also tilted. Specifically, this reflector 100c is positioned parallel to the other reflector 100c. Furthermore, the reflective surfaces of the two reflectors 100c are arranged opposite each other. In this embodiment, the laser generator generates a laser beam, which passes through the collimating lens assembly 100d to generate a parallel laser beam. After the parallel laser beam contacts the first reflector 100c, it is reflected by the first reflector 100c to the other reflector 100c. The other reflector 100c reflects the parallel laser beam again, and the reflected parallel laser beam enters the output end 103. The parallel laser beam passes through the focusing lens assembly 100e in the output end 103 and is focused. Therefore, after the laser beam passes through the output end 103, it is focused on the surface of the workpiece to be welded, thereby heating and melting the workpiece to be welded, thus realizing the laser welding operation.

[0030] In this embodiment, the laser generated by the laser generator at the input end 102 is reflected by the reflector 100c in the housing 100, thereby facilitating the laser to be emitted from the output end 103. In addition, the collimating lens assembly 100d in the input end 102 can collimate the laser beam generated by the laser generator to generate a parallel laser beam. The parallel laser beam is reflected by the reflector 100c in the housing 100 to the output end 103. The focusing lens assembly 100e in the output end 103 focuses the parallel laser beam, thereby enabling the high energy density laser beam to focus and heat the workpiece to be welded to melt it, thereby completing the laser welding operation.

[0031] Additionally, it should be noted that the number of reflectors 100c in the housing 100 in this embodiment includes, but is not limited to, two, and the tilt angle of the reflectors 100c is not limited to 45°. Any reflector assembly that can reflect the parallel laser beam passing through the collimator assembly 100d to the output end 103 can be used in this embodiment.

[0032] In this embodiment, since the laser beam needs to be collimated by the collimating lens assembly 100d and focused by the focusing lens assembly 100e within the housing 100 to achieve laser welding, the collimating lens assembly 100d and the focusing lens assembly 100e in the housing 100 generate a large amount of heat during prolonged operation. If this heat cannot dissipate, it can easily damage the laser welding head. To solve this problem, the present invention employs the technical solution of Embodiment 1 below to dissipate heat within the laser welding head, thereby ensuring the lifespan of the laser welding head. Furthermore, the present invention can be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention; therefore, the present invention is not limited to the specific embodiments disclosed below. Example 1

[0033] like Figure 5 As shown, it is a schematic diagram of the structure of the laser welding head in this embodiment using liquid cooling for heat dissipation. In this embodiment, the laser welding head is also provided with a liquid cooling unit 200. The liquid cooling unit 200 uses a liquid cooling medium flowing inside the housing 100 to absorb the heat generated inside the housing 100, so as to cool down the laser welding head.

[0034] like Figure 5 As shown, in this embodiment, a connecting end 101 is also provided at the end of the housing 100, and a liquid cooling medium interface 201 is provided on the connecting end 101. In this embodiment, the liquid cooling unit 200 includes a liquid cooling channel 202, which is spirally arranged and surrounds the collimating lens assembly 100d and the focusing lens assembly 100e respectively. One end of the liquid cooling channel 202 is connected to the liquid cooling medium interface 201, and a liquid cooling medium outlet is provided on the output end 103. The other end of the liquid cooling channel 202 is connected to the liquid cooling medium outlet. In this embodiment, the liquid cooling medium enters the liquid cooling channel 202 through the liquid cooling medium interface 201. The liquid cooling medium flows in the liquid cooling channel 202, absorbing the heat generated by the collimating lens assembly 100d and the focusing lens assembly 100e during operation, and then flows out through the liquid cooling medium outlet. This removes the heat generated by the collimating lens assembly 100d and the focusing lens assembly 100e in the housing 100, so as to facilitate heat dissipation of the laser welding head, avoid the problem of excessively high operating temperature of the laser welding head, and extend the service life of the laser welding head.

[0035] In addition, such as Figure 6As shown, the housing 100 is also provided with a connecting pipe I 202a and a connecting pipe II 202b. In this embodiment, the connecting pipe I 202a is used to connect the liquid cooling medium interface 201 and the liquid cooling channel 202 located at the collimating lens assembly 100d. Therefore, the liquid cooling medium enters the connecting pipe I 202a through the liquid cooling medium interface 201, and then enters the liquid cooling channel 202 at the collimating lens assembly 100d, thereby absorbing the heat generated at the collimating lens assembly 100d and cooling the collimating lens assembly 100d. In addition, in this embodiment, the collimating... The liquid cooling channel 202 at the collimator assembly 100d is connected to the liquid cooling channel 202 at the focusing mirror assembly 100e through the connecting pipe II 202b. When the liquid cooling medium flows in the liquid cooling channel 202 and absorbs the heat at the collimator assembly 100d, it flows into the liquid cooling channel 202 at the focusing mirror assembly 100e through the connecting pipe II 202b, thereby absorbing the heat generated by the working of the focusing mirror assembly 100e, thereby cooling the focusing mirror assembly 100e and reducing its temperature, and then discharging it through the liquid cooling medium outlet.

[0036] In this embodiment, the liquid cooling medium enters the liquid cooling channel 202 through the liquid cooling medium interface 201, and then cools down the collimating lens assembly 100d and the focusing lens assembly 100e respectively, thereby avoiding the occurrence of excessively high temperatures in the collimating lens assembly 100d and the focusing lens assembly 100e.

[0037] Furthermore, since the liquid cooling medium absorbs heat from the collimating lens assembly 100d and flows into the liquid cooling channel 202 at the focusing lens assembly 100e, the heat absorption effect of the liquid cooling medium on the focusing lens assembly 100e deteriorates. To solve this problem, in this embodiment, the liquid cooling channels 202 located at the collimating lens assembly 100d and the focusing lens assembly 100e can be set independently. That is, the liquid cooling channel 202 located at the collimating lens assembly 100d has its own independent liquid cooling medium interface 201 and liquid cooling medium outlet. The liquid cooling medium enters the liquid cooling channel 202 of the collimating lens assembly 100d and the focusing lens assembly 100e respectively through the liquid cooling medium interface 201 located at the collimating lens assembly 100d and the focusing lens assembly 100e. It absorbs the heat of the collimating lens assembly 100d and the focusing lens assembly 100e respectively and then discharges through the liquid cooling medium outlet. This improves the heat dissipation effect of the liquid cooling unit 200 on the collimating lens assembly 100d and the focusing lens assembly 100e and ensures the heat dissipation efficiency of the laser welding head.

[0038] The above describes the method of heat dissipation for the collimating lens assembly 100d and focusing lens assembly 100e inside the housing 100 by means of the liquid cooling unit 200 in this invention. The liquid cooling unit 200 can reduce the operating temperature of the collimating lens assembly 100d and focusing lens assembly 100e, thus ensuring the performance of the laser welding head.

[0039] The above description is only a preferred embodiment of the present invention. The technical solutions contained in the present invention include, but are not limited to, the above embodiments. Any improvements made by those skilled in the art in the above technical solutions, as long as they do not violate the above concept of the present invention, are included within the protection scope of the present invention.

[0040] In this invention, in order to facilitate rapid cooling of the weld joint during laser welding, the present invention adopts the technical solution of Embodiment 2 below to cool the weld joint during laser welding, thereby facilitating rapid cooling of the weld joint after laser welding, shortening the cooling time, and improving welding efficiency. Example 2

[0041] like Figure 7 As shown in this embodiment, in order to facilitate rapid cooling of the weld joint during laser welding, an air cooling unit 300 is used to cool the weld joint, thereby improving the cooling and solidification speed of the weld joint and improving the efficiency of laser welding.

[0042] like Figure 7 As shown, the air-cooling unit 300 in this embodiment includes an air-cooling medium interface 301 and an air-cooling channel 302 mounted on the housing 100. In this embodiment, the air-cooling channel 302 is connected to the air-cooling medium interface 301, and the air-cooling medium enters the air-cooling channel 302 through the air-cooling medium interface 301. Additionally, as... Figure 5 As shown, the bottom of the housing 100 is also provided with a spray port 100b. The spray port 100b is inclined and faces the laser focusing point. The air cooling channel 302 is connected to the spray port 100b. The air cooling medium enters the air cooling channel 302 through the air cooling medium interface 301 and is then sprayed out through the spray port 100b to cool the laser welding point, thereby improving the cooling and solidification speed of the welding point and thus improving the laser welding efficiency.

[0043] In addition, such as Figure 5As shown, since the reflector 100c in the housing 100 reflects the laser beam in real time, the temperature of the reflector 100c is high after long-term operation. In this embodiment, in order to facilitate the cooling of the reflector 100c, the air cooling medium interface 301 is connected to the inner cavity 100a of the housing 100, and the air cooling channel 302 is connected to the inner cavity 100a. The air cooling medium enters the inner cavity 100a through the air cooling medium interface 301 to cool the reflector 100c in the housing 100 before entering the air cooling channel 302. In addition, the jet nozzle 100b is also connected to the inner cavity 100a. The end of the air cooling channel 302 is connected to the inner cavity 100a. The air cooling medium enters the inner cavity 100a on the other side of the housing 100 through the air cooling channel 302 to cool another reflector 100c before entering the jet nozzle 100b and being ejected, thereby cooling the laser welding point.

[0044] In this embodiment, a cooling medium is introduced into the inner cavity 100a to cool the reflector 100c in the inner cavity 100a, and then sprayed out to cool the weld joint. This avoids the reflector 100c from getting too hot and also improves the cooling and solidification speed of the weld joint, thus ensuring the efficiency of laser welding.

[0045] The above describes the technical solution of the present invention, which uses the air cooling unit 300 to cool down the reflector 100c in the housing 100 and also to cool down the weld joint. On the one hand, this avoids the situation where the temperature of the reflector 100c in the housing 100 is too high, and on the other hand, it improves the cooling and solidification speed of the laser weld joint, thus ensuring the efficiency of laser welding. It should be noted that the air cooling unit 300 described above is only a preferred embodiment of the present invention. The air cooling unit 300 in the present invention includes, but is not limited to, the above-described method. Any technical solution that can cool down the reflector 100c and rapidly cool down the laser weld joint can be applied to the present invention.

[0046] In addition, in order to further improve the cooling effect of the air-cooling unit 300, the present invention also adopts the following technical solution of embodiment 3 to improve the cooling efficiency of the air-cooling unit 300. The following technical solution of embodiment 3, based on embodiment 1 and embodiment 2, uses liquid cooling unit 200 to cool the air-cooling unit 300, thereby improving the cooling effect of the air-cooling unit 300. Example 3

[0047] like Figure 5As shown, based on Embodiments 1 and 2 above, the liquid cooling unit 200 further includes a liquid cooling channel 202 disposed on the connection end 101. In this embodiment, the liquid cooling channel 202 is spirally disposed inside the connection end 101, and the liquid cooling channel 202 surrounds the outside of the air cooling medium interface 301. When the air cooling medium enters the housing 100 through the air cooling medium interface 301, the liquid cooling medium in the liquid cooling channel 202 located outside the air cooling medium interface 301 cools the air cooling medium, thereby reducing the initial temperature of the air cooling medium, so as to improve the cooling effect of the air cooling medium on the reflector 100c and the laser welding point in the later stage.

[0048] In addition, in this embodiment, a temperature sensor and a solenoid valve are also installed in the injection port 100b on the housing 100. The solenoid valve is connected to the injection port 100b on one hand, and a return channel 303 is also connected to the solenoid valve on the other hand. The return channel 303 is connected to the gas cooling medium interface 301. The temperature sensor detects the temperature of the gas medium in the injection port 100b in real time. When the temperature of the gas medium meets the preset threshold, the solenoid valve is connected to the injection port 100b, and the gas medium is ejected through the injection port 100b to cool the laser welding point. When the temperature of the gas medium exceeds the threshold, the solenoid valve is connected to the injection port 100b. When the preset threshold is exceeded, the solenoid valve connects to the return channel 303, and the gas medium enters the gas cooling medium interface 301 through the return channel 303. After the gas medium is further cooled by the liquid cooling channel 202 outside the gas cooling medium interface 301, the gas cooling medium re-enters the inner cavity of the housing 100 to cool the reflector 100c before entering the injection port 100b. This continues until the gas medium temperature meets the preset threshold and is then ejected from the injection port 100b to cool the laser welding point, thereby increasing the cooling speed of the laser welding point and ensuring the efficiency of laser welding.

[0049] In this embodiment, the liquid cooling unit 200 performs preliminary cooling of the air cooling medium in the air cooling unit 300, thereby improving the cooling effect of the air cooling unit 300 on the reflector 100c and ensuring the cooling effect of the air cooling medium on the weld joint. This achieves the effect of dual thermal management between gas and liquid, ensuring the efficiency of the laser welding head and the effect of laser welding. Through the above-mentioned dual thermal management of gas and liquid, the cooling treatment of the laser welding head is achieved on the one hand, and the rapid cooling of the laser weld joint is also achieved on the other hand.

[0050] The above description is only a preferred embodiment of the present invention. Specifically, the liquid cooling unit 200 is used to initially cool the air cooling medium in the air cooling unit 300, thereby ensuring the cooling effect of the air cooling unit 300. Of course, the above embodiments are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. In addition, in the above embodiments 1, 2 and 3, the liquid cooling unit 200 and the air cooling unit 300 are integrated on the housing 100 of the laser welding head, making the laser welding head smaller in size and integrated into a compact laser welding head, which is convenient for transportation and storage and has high market application prospects.

Claims

1. A compact laser welding head with thermal management, comprising a housing (100) and an input end (102) and an output end (103) disposed on the housing (100), wherein an inner cavity (100a) is provided inside the housing (100), a mirror assembly is installed in the inner cavity (100a), and a laser generator is connected to the input end (102), a collimating mirror assembly (100d) is installed in the input end (102), and a focusing mirror assembly (100e) is installed in the output end (103). The laser generator generates a laser beam, which is collimated by the collimating mirror assembly (100d) in the input end (102) to generate a parallel laser beam. The mirror assembly in the inner cavity (100a) reflects the parallel laser beam to the output end (103), which is then focused by the focusing mirror assembly (100e) and emitted for laser welding. The head is characterized in that... The laser welding head also includes a liquid cooling unit (200), in which the liquid cooling medium flows to cool the alignment lens assembly (100d) and the focusing lens assembly (100e).

2. The compact laser welding head with thermal management according to claim 1, characterized in that, The liquid cooling unit (200) includes a spirally arranged liquid cooling channel (202), which is integrated in the housing (100) and arranged around the collimating lens assembly (100d). The liquid cooling channel (202) is provided with a liquid cooling medium interface (201) and a liquid cooling medium outlet. The liquid cooling medium enters the liquid cooling channel (202) through the liquid cooling medium interface (201) to cool the collimating lens assembly (100d) and then exits from the liquid cooling medium outlet.

3. The compact laser welding head with thermal management according to claim 1, characterized in that, The liquid cooling unit (200) includes a spirally arranged liquid cooling channel (202), which is integrated in the housing (100) and arranged around the focusing lens assembly (100e). The liquid cooling channel (202) is provided with a liquid cooling medium interface (201) and a liquid cooling medium outlet. The liquid cooling medium enters the liquid cooling channel (202) through the liquid cooling medium interface (201) to cool the focusing lens assembly (100e) and then exits from the liquid cooling medium outlet.

4. The compact laser welding head with thermal management according to claim 1, characterized in that, The liquid cooling unit (200) includes a spirally arranged liquid cooling channel (202), which is integrated in the housing (100) and surrounds the collimating lens assembly (100d) and the focusing lens assembly (100e) respectively. The housing (100) is also provided with a connecting end (101), on which a liquid cooling medium interface (201) is provided. The liquid cooling channel (202) on the collimating lens assembly (100d) and the liquid cooling medium interface (201) on the connecting end (101) are connected by a connecting pipe I (202). a) The liquid cooling channel (202) at the collimating lens assembly (100d) and the liquid cooling channel (202) at the focusing lens assembly (100e) are connected through the connecting pipe II (202b). The output end (103) is provided with a liquid cooling medium outlet connected to the liquid cooling channel (202) at the focusing lens assembly (100e). The liquid cooling medium enters the liquid cooling channel (202) through the liquid cooling medium interface (201) and dissipates heat from the collimating lens assembly (100d) and the focusing lens assembly (100e) respectively, and then flows out through the liquid cooling medium outlet at the output end.

5. The compact laser welding head with thermal management according to claim 4, characterized in that, The laser welding head also includes an air cooling unit (300), which includes an air cooling medium interface (301) and an air cooling channel (302). The air cooling medium interface (301) is located on the connection end (101), and the air cooling channel (302) is connected to the air cooling medium interface (301). The bottom of the housing (100) is also provided with a spray port (100b), and the air cooling channel (3021) is connected to the spray port (100b). The air cooling medium enters the air cooling channel (302) through the air cooling medium interface (301) and is sprayed out through the spray port (100b) to cool down the laser welding point.

6. The compact laser welding head with thermal management according to claim 5, characterized in that, The jet nozzle (100b) is tilted, and the tilting direction of the jet nozzle (100b) is towards the laser focusing point.

7. The compact laser welding head with thermal management according to claim 5, characterized in that, The air cooling medium interface (301) is connected to the inner cavity (100a) of the housing (100), and the air cooling channel (302) is connected to the inner cavity (100a). The air cooling medium enters the inner cavity (100a) through the air cooling medium interface (301) to cool down the reflector assembly in the housing (100) and then enters the spray port (100b) and is sprayed out, thereby cooling down the laser welding point.

8. The compact laser welding head with thermal management according to claim 7, characterized in that, The liquid cooling unit (200) further includes a liquid cooling channel (202) disposed on the connection end (101). The liquid cooling channel (202) is spirally disposed inside the connection end (101), and the liquid cooling channel (202) is disposed around the outside of the air cooling medium interface (301) for cooling the air cooling medium entering the air cooling medium interface (301).

9. The compact laser welding head with thermal management according to claim 8, characterized in that, The injection port (100b) is also equipped with a temperature sensor and a solenoid valve. The solenoid valve is connected to the injection port (100b) on one side and to a return channel (303) on the other side. The return channel (303) is connected to the air-cooled medium interface (301). The temperature sensor detects the temperature of the air-cooled medium in real time. When the temperature meets the preset threshold, the solenoid valve sprays the air-cooled medium from the injection port (100b). When the temperature of the air-cooled medium exceeds the preset threshold, the solenoid valve returns the air-cooled medium from the return channel (303) to the air-cooled medium interface (301) and cools it through the liquid cooling medium in the liquid cooling channel (202) in the connection end (101).

10. The compact laser welding head with thermal management according to claim 1, characterized in that, The mirror assembly includes two mirrors (100c), which are located in the inner cavity (100a). One mirror (100c) is positioned relative to the collimating mirror assembly (100d) and is tilted at an angle of 45°. The other mirror (100c) is positioned relative to the focusing mirror assembly (100e), and the two mirrors (100c) are arranged in parallel with their reflecting surfaces facing each other.

Images