A laser welding system based on a high-precision two-dimensional scanning head

Abstract

This application relates to the field of welding technology, specifically disclosing a laser welding system based on a high-precision two-dimensional scanning head. The system includes a housing, a scanning head, a focusing module, and a heat spreader. The scanning head, focusing module, and heat spreader are all installed within the housing. A thermoelectric cooler is mounted on the heat spreader, with its cold end attached to the heat spreader. A cooling mechanism for cooling the hot end of the thermoelectric cooler is installed on the housing. The scanning head includes a mounting base, an X-ray mirror, and a Y-ray mirror. The X-ray mirror and Y-ray mirror are mounted on the mounting base and extend into the optical cavity of the mounting base. A U-shaped air duct is provided within one side wall of the mounting base, with both ends of the U-shaped air duct connected to the optical cavity. Heat dissipation fins are laid within the U-shaped air duct, and a silent fan is installed at the air inlet of the U-shaped air duct. The heat dissipation fins are connected to a first heat pipe, the end of which is connected to the heat spreader. This application improves the heat dissipation efficiency, anti-interference capability, and heat dissipation uniformity of the laser welding system.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a laser welding system based on a high-precision two-dimensional scanning head. Background Technology

[0002] Laser welding systems are an integration of laser technology, precision motion control technology, and optical scanning technology. The core components can be divided into four categories: laser generator, high-precision two-dimensional scanning head, optical transmission and focusing module, and control system and software. These components work together to achieve high-precision welding.

[0003] In the aforementioned laser welding system, the operating environment of the internal system is crucial. During operation, the system generates heat. Excessive heat can easily cause deformation of the lenses, affecting the focal length, and can also cause the adhesive connecting the lenses to deteriorate, affecting the stability of the lens connection and reducing welding precision. To reduce the system temperature, two heat dissipation methods are adopted: one is air cooling, which relies on a fan to drive airflow to remove heat. The structure is relatively simple, but it is limited by the physical properties of the heat dissipation medium (air), and its disadvantages include low heat dissipation efficiency, great susceptibility to ambient temperature and cleanliness, and vibration and noise interference; the other is water cooling, which removes heat through coolant circulation, and its efficiency is much higher than air cooling. However, its disadvantages include leakage, vibration and movement interference caused by water flow and pipelines, and easy overcooling of lenses and local temperature differences.

[0004] Therefore, there is an urgent need for a laser welding system with high heat dissipation efficiency, strong anti-interference, and uniform heat dissipation. Summary of the Invention

[0005] To improve heat dissipation efficiency, anti-interference ability, and heat dissipation uniformity, this application provides a laser welding system based on a high-precision two-dimensional scanning head.

[0006] The laser welding system based on a high-precision two-dimensional scanning head provided in this application adopts the following technical solution:

[0007] A laser welding system based on a high-precision two-dimensional scanning head includes a housing, a scanning head, a focusing module, and a heat spreader. The scanning head, focusing module, and heat spreader are all installed within the housing. A thermoelectric cooler is mounted on the surface of the heat spreader, with the cold end of the thermoelectric cooler attached to the surface of the heat spreader. A cooling mechanism for cooling the hot end of the thermoelectric cooler is installed on the surface of the housing. The scanning head includes a mounting base, an X-ray mirror, and a Y-ray mirror. The X-ray mirror and Y-ray mirror are mounted on the mounting base and extend into the optical cavity of the mounting base. A U-shaped air duct is provided in one side wall of the mounting base, with both ends of the U-shaped air duct connected to the optical cavity. Heat dissipation fins are laid inside the U-shaped air duct, and a silent fan is installed at the air inlet of the U-shaped air duct. The heat dissipation fins are connected to a first heat pipe, the end of which is connected to the heat spreader.

[0008] Optionally, the sidewall of the U-shaped air duct is divided into a movable part detachable from the mounting base and a fixed part integral with the mounting base. The U-shaped air duct is divided into two parts, one part located within the movable part and the other part located within the fixed part. The movable part is sealed to the side of the fixed part by bolts. The heat dissipation fins include heat exchange pipes and fins. The outer wall of the heat exchange pipes is attached to the inner wall of the U-shaped air duct. Multiple fins are provided and arranged along the direction of the heat exchange pipes and integrally formed with the inner wall of the heat exchange pipes. The heat exchange pipes are divided into two parts, one part located within the movable part and the other part located within the fixed part. There are two first heat pipes. One end of each of the two first heat pipes is connected to the outer wall of the two parts of the heat exchange pipes, and the other end of each of the two first heat pipes is connected to the heat spreader. The silent fan is installed on the inner wall of the optical cavity and faces the heat exchange pipes.

[0009] Optionally, the motor of the X-ray mirror is held in place by the movable retaining ring and the fixed retaining ring of the X-ray mirror and is mounted on the surface of the outer casing by the fixed retaining ring of the X-ray mirror; a second heat pipe is connected to the end face of both the movable retaining ring and the fixed retaining ring of the X-ray mirror, and the other end of the two second heat pipes is connected to the surface of the heat spreader.

[0010] Optionally, the motor of the Y-mirror is held in place by the movable retaining ring and the fixed retaining ring of the Y-mirror and is mounted on the surface of the outer casing by the fixed retaining ring of the Y-mirror; a third heat pipe is connected to the end face of both the movable retaining ring and the fixed retaining ring of the Y-mirror, and the other end of the two third heat pipes is connected to the surface of the heat spreader.

[0011] Optionally, the focusing module includes a focusing motor, a first connecting rod, a second connecting rod, a support base, a linear guide rail, and a lens frame; the focusing motor is mounted on the bottom surface of the housing, one end of the first connecting rod is connected to the output shaft of the focusing motor, and one end of the second connecting rod is hinged to the other end of the first connecting rod; the linear guide rail is mounted on the bottom surface of the housing, the support base is mounted on the slider of the linear guide rail, and the lens frame is integrally formed on the top surface of the support base, and the lens frame is used to mount a lens; the other end of the second connecting rod is rotatably connected to the side of the support base.

[0012] Optionally, a flexible heat pipe is provided between the support base and the heat spreader. The flexible heat pipe includes an evaporation section, a flexible section, and a condensation section. The evaporation section is laid around the circumference of the mirror frame on the top surface of the support base. One end of the flexible section is connected to one end of the evaporation section. The condensation section is installed on the extension of the heat spreader. The other end of the flexible section is connected to the condensation section. The flexible section is located at the end of the second connecting rod away from the first connecting rod.

[0013] Optionally, the focusing motor is held in place by an upper retaining ring and a lower retaining ring, with the lower retaining ring mounted on the bottom surface of the housing; both the end face of the upper retaining ring and the end face of the lower retaining ring are connected to one end of a fourth heat pipe, and the other end of the fourth heat pipe is connected to the heat spreader plate.

[0014] Optionally, the cooling mechanism includes an aluminum plate, a fifth heat pipe, a water tank, a silent water pump, and a water radiator; a notch for inserting the water tank is provided on one side of the outer casing, and the water tank is installed on the side of the outer casing; the fifth heat pipe is located at the bottom of the water tank, and both ends of the fifth heat pipe extend outside the water tank; the aluminum plate is installed at both ends of the fifth heat pipe, and the aluminum plate is installed at the hot end of the semiconductor cooling chip; a water inlet hose is connected between the bottom inlet of the water radiator and the bottom of the water tank, and a water outlet hose is connected between the top outlet of the water radiator and the top surface of the water tank; the inlet and outlet of the silent water pump are connected to the water inlet hose.

[0015] Optionally, both the water-cooling radiator and the silent water pump are mounted on the base of the robotic arm used to control the movement of the housing.

[0016] Optionally, the evaporation section of the flexible heat pipe is bonded and fixed to the top surface of the support base using thermally conductive adhesive.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. When dissipating heat in the laser welding system, the cold end of the thermoelectric cooler cools the heat spreader, and the hot end of the thermoelectric cooler dissipates heat through the cooling mechanism. The heat spreader cools the heat dissipation fins through the first heat pipe. When the silent fan is started, it generates negative pressure at the air inlet of the U-shaped air duct, which introduces the high-temperature airflow in the optical cavity into the U-shaped channel. The high-temperature airflow undergoes heat exchange through the heat dissipation fins, turning into a low-temperature airflow. The low-temperature airflow is then discharged into the optical cavity through the air outlet of the U-shaped air duct, causing the airflow in the optical cavity to circulate within the U-shaped air duct. The heat dissipation fins cool the circulating airflow, keeping the environment inside the optical cavity at a low temperature. The X-ray and Y-ray mirrors are indirectly cooled, avoiding vibrations caused by airflow directly blowing on the mirrors and mirrors. Water cooling is not required, which improves the heat dissipation efficiency, anti-interference, and heat dissipation uniformity of the laser welding system.

[0019] 2. When arranging the heat dissipation fins, the movable part and the fixed part of the mounting base are separated, and the two heat dissipation pipes are respectively arranged in the U-shaped air ducts of the two parts. Then, the movable part and the fixed part are attached and connected to seal the movable part to the fixed part of the mounting base. When the silent fan drives the airflow, the airflow enters the heat dissipation pipe and flows between adjacent fins. The heat spreader continues to cool the heat dissipation fins through the first heat pipe, so that the airflow flowing between the fins can exchange heat with the heat dissipation fins. At this time, the silent fan only needs to drive the airflow. Through the heat exchange between the airflow and the heat dissipation fins, the cooling of the environment inside the optical cavity can be completed, indirectly cooling the lens mount and lens.

[0020] 3. To dissipate the heat generated by the lens, the lens transfers the heat to the frame and support. The support heats the evaporation section, where the liquid evaporates and absorbs heat. The vapor from the evaporation section is transferred to the condensation section through the flexible section. The vaporizer cools and condenses the vapor in the condensation section. The condensed liquid flows back to the evaporation section through capillary effect to continue evaporating and absorbing heat. The flexible heat pipes cool the frame and support, thereby cooling the lens. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the laser welding system according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the internal structure of the outer casing according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram showing the separation of the movable and fixed parts of the mounting base in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the U-shaped air duct structure according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the heat dissipation fins in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Outer shell; 2. Scanning head; 21. Mounting base; 2101. Moving part; 2102. Fixed part; 211. Optical cavity; 212. U-shaped air duct; 22. X-ray galvanometer; 221. Moving ring of X-ray galvanometer; 222. Fixed ring of X-ray galvanometer; 23. Y-ray galvanometer; 231. Moving ring of Y-ray galvanometer; 232. Fixed ring of Y-ray galvanometer; 24. Heat sink fins; 241. Heat exchange pipe; 242. Fin part; 25. Silent fan; 3. Focusing module; 31. Focusing motor; 311. Upper ring; 3 12. Lower retaining ring; 32. First connecting rod; 33. Second connecting rod; 34. Support base; 35. Linear guide rail; 36. Frame; 4. Heat spreader; 41. Semiconductor cooling chip; 42. First heat pipe; 43. Second heat pipe; 44. Third heat pipe; 45. Fourth heat pipe; 5. Cooling mechanism; 51. Aluminum plate; 52. Fifth heat pipe; 53. Water tank; 54. Silent water pump; 55. Water radiator; 551. Inlet hose; 552. Outlet hose; 6. Flexible heat pipe; 61. Evaporation section; 62. Flexible section; 63. Condensation section. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0029] This application discloses a laser welding system based on a high-precision two-dimensional scanning head. (Refer to...) Figure 1-5 The laser welding system includes a housing 1, a scanning head 2, a focusing module 3, and a heat spreader 4. The scanning head 2, focusing module 3, and heat spreader 4 are all mounted on the bottom inner surface of the housing 1. A thermoelectric cooler 41 is mounted on the surface of the heat spreader 4, with the cold end of the thermoelectric cooler 41 attached to the surface of the heat spreader 4. A cooling mechanism 5 for cooling the hot end of the thermoelectric cooler 41 is mounted on the surface of the housing 1. The scanning head 2 includes a mounting base 21, an X-ray mirror 22, and a Y-ray mirror 23. 3. The lens and lens mount are installed on the mounting base 21 and extend into the optical cavity 211 of the mounting base 21; a U-shaped air duct 212 is provided in one side wall of the mounting base 21, and the two ends of the U-shaped air duct 212 are connected to the optical cavity 211; heat dissipation fins 24 are laid in the U-shaped air duct 212, a silent fan 25 is installed at the air inlet of the U-shaped air duct 212, one end of the heat dissipation fin 24 is connected to the first heat pipe 42, and the other end of the first heat pipe 42 passes through the mounting base 21 and is connected to the heat spreader 4.

[0030] When dissipating heat from the laser welding system, the cold end of the thermoelectric cooler 41 cools the heat spreader 4, and the hot end of the thermoelectric cooler 41 dissipates heat through the cooling mechanism 5. The heat spreader 4 cools the heat dissipation fins 24 through the first heat pipe 42. When the silent fan is started, it generates negative pressure at the air inlet of the U-shaped air duct 212, drawing the high-temperature airflow from the optical cavity 211 into the U-shaped channel. The high-temperature airflow undergoes heat exchange through the heat dissipation fins 24, transforming it into a low-temperature airflow. The airflow, which is low temperature, is then discharged into the optical cavity 211 through the air outlet of the U-shaped air duct 212, so that the airflow in the optical cavity 211 circulates in the U-shaped air duct 212. The heat dissipation fins 24 cool the circulating airflow, so that the environment inside the optical cavity 211 is in a low temperature state. The lenses and mounts of the X-mirror 22 and Y-mirror 23 are indirectly cooled, avoiding vibration caused by the airflow blowing directly on the lenses and mounts. Water cooling is not required, which improves the heat dissipation efficiency, anti-interference and heat dissipation uniformity of the laser welding system.

[0031] The side wall of the U-shaped air duct 212 is divided into a movable part 2101 that is detachable from the mounting base 21 and a fixed part 2102 that is integral with the mounting base 21. The U-shaped air duct 212 is divided into two parts, one part is located inside the movable part 2101 and the other part is located inside the fixed part 2102. The movable part 2101 is sealed to the side of the fixed part 2102 by bolts. The heat dissipation fins 24 include heat exchange pipes 241 and fin parts 242. The outer wall of the heat dissipation pipes is attached to the inner wall of the U-shaped air duct 212. The wall and fin portion 242 are provided with multiple fins arranged along the heat dissipation pipe arrangement direction and integrally formed with the inner wall of the heat dissipation pipe. The heat dissipation pipe is divided into two parts, one part is located in the movable part 2101 and the other part is located in the fixed part 2102. There are two first heat pipes 42. One end of the two first heat pipes 42 is connected to the outer wall of the two parts of the heat dissipation pipe respectively, and the other end of the two first heat pipes 42 is connected to the heat dissipation plate 4. The silent fan 25 is installed on the inner wall of the optical cavity 211 and the fan is facing the heat dissipation pipe.

[0032] When arranging the heat dissipation fins 24, the movable part 2101 and the fixed part 2102 of the mounting base 21 are separated, and the two heat dissipation pipes are respectively arranged in the U-shaped air ducts 212 of the two parts. Then, the movable part 2101 and the fixed part 2102 are attached and connected to seal the movable part 2101 and the fixed part 2102 of the mounting base 21. When the silent fan 25 induced the airflow, the airflow entered the heat dissipation pipe and flowed between the adjacent fin parts 242. The heat dissipation plate 4 continued to cool the heat dissipation fins 24 through the first heat pipe 42, so that the airflow flowing between the fin parts 242 could exchange heat with the heat dissipation fins 24. At this time, the silent fan 25 only needs to induce the airflow. Through the heat exchange between the airflow and the heat dissipation fins 24, the cooling of the environment inside the optical cavity 211 can be completed, and the lens mount and lens can be cooled indirectly.

[0033] The motor of the X-ray mirror 22 is held in place by the movable retaining ring 221 and the fixed retaining ring 222 of the X-ray mirror and is mounted on the surface of the housing 1 by the fixed retaining ring 222. Both the movable retaining ring 221 and the fixed retaining ring 222 of the X-ray mirror are made of aluminum. A second heat pipe 43 is connected to the end face of both the movable retaining ring 221 and the fixed retaining ring 222 of the X-ray mirror. The other end of the two second heat pipes 43 is connected to the surface of the heat spreader 4.

[0034] The motor of the X-mirror 22 generates heat, which is transferred to the movable retaining ring 221 and the fixed retaining ring 222 of the X-mirror. The heat dissipation plate 4 cools the movable retaining ring 221 and the fixed retaining ring 222 of the X-mirror through the second heat pipe 43 to prevent the motor of the galvanometer from overheating.

[0035] The motor of the Y-mirror 23 is held in place by the movable retaining ring 231 and the fixed retaining ring 231 of the Y-mirror and is mounted on the surface of the housing 1 by the fixed retaining ring 231 of the Y-mirror. Both the movable retaining ring 231 and the fixed retaining ring 231 of the Y-mirror are made of aluminum. A third heat pipe 44 is connected to the end face of both the movable retaining ring 231 and the fixed retaining ring 231 of the Y-mirror. The other end of the two third heat pipes 44 is connected to the surface of the heat spreader 4.

[0036] The motor of the Y-mirror 23 generates heat, which is transferred to the movable retaining ring 231 and the fixed retaining ring 231 of the Y-mirror. The heat dissipation plate 4 cools the movable retaining ring 231 and the fixed retaining ring 231 of the Y-mirror through the third heat pipe 44 to prevent the motor of the mirror from overheating.

[0037] The focusing module 3 includes a focusing motor 31, a first connecting rod 32, a second connecting rod 33, a support base 34, a linear guide rail 35, and a lens frame 36. The focusing motor 31 is mounted on the bottom surface of the housing 1. One end of the first connecting rod 32 is connected to the output shaft of the focusing motor 31, and one end of the second connecting rod 33 is hinged to the other end of the first connecting rod 32. The linear guide rail 35 is mounted on the bottom surface of the housing 1, and the support base 34 is mounted on the slider of the linear guide rail 35. The lens frame 36 is integrally formed on the top surface of the support base 34 and is used to mount the lens. The other end of the second connecting rod 33 is rotatably connected to the side of the support base 34. The lens frame 36 and the support base 34 are made of aluminum.

[0038] When the lens needs to be moved back and forth, the focusing motor 31 drives the first link 32 to swing back and forth. The first link 32 drives the second link 33 to move back and forth. The second link 33 drives the support 34 to move back and forth. The support 34 drives the lens frame 36 to move back and forth. The lens frame 36 can then drive the lens to adjust its focal length.

[0039] A flexible heat pipe 6 is provided between the support base 34 and the heat spreader 4. The flexible heat pipe 6 includes an evaporation section 61, a flexible section 62, and a condensation section 63. The evaporation section 61 is laid around the top surface of the support base 34 around the mirror frame 36. One end of the flexible section 62 is connected to one end of the evaporation section 61. The condensation section 63 is installed on the extension of the heat spreader 4. The other end of the flexible section 62 is connected to the condensation section 63. The flexible section 62 is located at the end of the second connecting rod 33 away from the first connecting rod 32. The evaporation section 61 of the flexible heat pipe 6 is bonded and fixed to the top surface of the support base 34 with thermally conductive adhesive.

[0040] To dissipate the heat generated by the lens, the lens transfers the heat to the frame 36 and the support 34. The support 34 heats the evaporation section 61, where the liquid evaporates and absorbs heat. The vapor from the evaporation section 61 is transferred to the condensation section 63 through the flexible section 62. The heat spreader 4 cools and condenses the vapor in the condensation section 63. The condensed liquid flows back to the evaporation section 61 through capillary effect to continue evaporating and absorbing heat. The flexible heat pipe 6 cools the frame 36 and the support 34, thereby cooling the lens.

[0041] The focusing motor 31 is held in place by an upper retaining ring 311 and a lower retaining ring 312, with the lower retaining ring 312 mounted on the bottom surface of the housing 1. One end of a fourth heat pipe 45 is connected to the end face of both the upper retaining ring 311 and the lower retaining ring 312, and the other end of the fourth heat pipe 45 is connected to a heat spreader 4. The heat spreader 4 cools the upper retaining ring 311 and the lower retaining ring 312 through the fourth heat pipe 45, thus removing the heat generated by the focusing motor 31.

[0042] The cooling mechanism 5 includes an aluminum plate 51, a fifth heat pipe 52, a water tank 53, a silent water pump 54, and a water radiator 55. A notch for inserting the water tank 53 is provided on one side of the outer casing 1, and the water tank 53 is installed on the side of the outer casing 1. The fifth heat pipe 52 is located at the bottom of the water tank 53, and both ends of the fifth heat pipe 52 extend out of the water tank 53. The aluminum plate 51 is installed at both ends of the fifth heat pipe 52 and is installed at the hot end of the semiconductor cooling chip 41. A water inlet hose 551 is connected between the bottom inlet of the water radiator 55 and the bottom of the water tank 53, and a water outlet hose 552 is connected between the top outlet of the water radiator 55 and the top surface of the water tank 53. The inlet and outlet of the silent water pump 54 are connected to the water inlet hose 551.

[0043] In order to quickly dissipate the heat generated by the hot end of the semiconductor cooling chip 41, the heat is transferred to the fifth heat pipe 52 through the aluminum plate 51. The water in the water tank 53 cools the fifth heat pipe 52. The silent water pump 54 is started and pumps the water in the water tank 53 into the water cooling radiator 55. The water cooling radiator 55 dissipates the heat of the water flowing into the water cooling radiator 55 through the side-mounted fan. The cooled water flows back to the water tank 53, so that the water in the water tank 53 is circulated. The circulating water carries away the heat generated by the fifth heat pipe 52. The water cooling radiator 55 keeps the water in the water tank 53 at a low temperature.

[0044] Both the water-cooling radiator 55 and the silent water pump 54 are mounted on the base of the robotic arm used to control the movement of the housing 1. By mounting the water-cooling radiator 55 and the silent water pump 54 on the base, they are avoided from being directly connected to the housing 1, thus reducing the interference of vibration from the water-cooling radiator 55 and the silent water pump 54.

[0045] The implementation principle of a laser welding system based on a high-precision two-dimensional scanning head 2 in this application embodiment is as follows: When the laser welding system is cooled, the cold end of the semiconductor cooling chip 41 cools the heat spreader 4, the semiconductor cooling chip 41 cools the heat spreader 4, the hot end of the semiconductor cooling chip 41 is cooled by the cooling mechanism 5, and the heat spreader 4 cools the heat dissipation fins 24 through the first heat pipe 42; the silent fan is started, and the silent fan generates negative pressure at the air inlet of the U-shaped air duct 212, introducing the high-temperature airflow in the optical cavity 211 into the U-shaped channel, and the high-temperature airflow passes through the heat dissipation fins Heat exchange in plate 24 transforms the high-temperature airflow into a low-temperature airflow. The low-temperature airflow is then discharged into the optical cavity 211 through the outlet of the U-shaped air duct 212, causing the airflow in the optical cavity 211 to circulate within the U-shaped air duct 212. The heat dissipation fins 24 cool the circulating airflow, keeping the environment inside the optical cavity 211 at a low temperature. The lenses and mounts of the X-mirror 22 and Y-mirror 23 are indirectly cooled, avoiding vibrations caused by airflow directly blowing on the lenses and mounts. Water cooling is not required, which improves the heat dissipation efficiency, anti-interference, and heat dissipation uniformity of the laser welding system.

[0046] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser welding system based on a high-precision two-dimensional scanning head, characterized in that: The device includes a housing (1), a scanning head (2), a focusing module (3), and a heat spreader (4); the scanning head (2), the focusing module (3), and the heat spreader (4) are all installed inside the housing (1); a semiconductor cooling chip (41) is installed on the surface of the heat spreader (4), and the cold end of the semiconductor cooling chip (41) is attached to the surface of the heat spreader (4); a cooling mechanism (5) for cooling the hot end of the semiconductor cooling chip (41) is installed on the surface of the housing (1); the scanning head (2) includes a mounting base (21), an X-ray mirror (22), and a Y-ray mirror (23); the X-ray mirror (22) and the Y-ray mirror (23) are installed on the mounting base (21) and extend into the optical cavity (211) of the mounting base (21); The mounting base (21) has a sealed U-shaped air duct (212) in one side wall. The two ends of the U-shaped air duct (212) are connected only to the optical cavity (211) to form an internal closed loop. The side wall of the U-shaped air duct (212) is divided into a movable part (2101) that is detachable from the mounting base (21) and a fixed part (2102) that is integral with the mounting base (21). The U-shaped air duct (212) is divided into two parts and is correspondingly embedded in the movable part (2101) and the fixed part (2102). After the movable part (2101) and the fixed part (2102) are sealed and spliced, a complete U-shaped air duct (212) is formed. The U-shaped air duct (212) is provided with heat exchange pipes (241) and heat dissipation fins (24) integrally formed with fins (242). The outer wall of the heat exchange pipes (241) is tightly fitted with the inner wall of the U-shaped air duct (212). A silent fan (25) is installed at the air inlet of the U-shaped air duct (212). The silent fan (25) is directly facing the heat exchange pipes (241) and drives the airflow to flow in a closed loop along the U-shaped air duct (212). The outer walls of the two parts of the heat exchange pipes (241) of the heat dissipation fins (24) are respectively connected to a first heat pipe (42). The other ends of the two first heat pipes (42) are connected to the heat spreader (4). The motor of the X-mirror (22) is held tightly by the X-mirror movable retaining ring (221) and the X-mirror fixed retaining ring (222), and the motor of the Y-mirror (23) is held tightly by the Y-mirror movable retaining ring (231) and the Y-mirror fixed retaining ring (232). The end faces of the X-mirror movable retaining ring (221), the X-mirror fixed retaining ring (222), the Y-mirror movable retaining ring (231), and the Y-mirror fixed retaining ring (232) are respectively connected to the second heat pipe (43) and the third heat pipe (44). The other ends of the second heat pipe (43) and the third heat pipe (44) are both connected to the heat spreader (4). The focusing module (3) includes a focusing motor (31), a first connecting rod (32), a second connecting rod (33), a support base (34), a linear guide rail (35), and a lens frame (36). The support base (34) is mounted on the slider of the linear guide rail (35) and moves dynamically with the slider. The lens frame (36) is integrally formed on the top surface of the support base (34). A flexible heat pipe (6) is provided between the support base (34) and the heat spreader (4). The evaporation section (61) of the flexible heat pipe (6) is laid on the top surface of the support base (34) by wrapping around the lens frame (36) with thermally conductive adhesive. The flexible section (62) avoids the movement trajectory of the second connecting rod (33). The condensation section (63) is fixed to the extension of the heat spreader (4). The focusing motor (31) is held in place by an upper retaining ring (311) and a lower retaining ring (312). The end faces of the upper retaining ring (311) and the lower retaining ring (312) are connected to a fourth heat pipe (45). The other end of the fourth heat pipe (45) is connected to a heat spreader (4). The cooling mechanism (5) includes an aluminum plate (51), a fifth heat pipe (52), a water tank (53), a silent water pump (54), and a water radiator (55). The aluminum plate (51) is attached to the hot end of the semiconductor cooling chip (41) and connected to the fifth heat pipe (52). The fifth heat pipe (52) is embedded in the bottom of the water tank (53). The water radiator (55) and the silent water pump (54) are both independently installed on the base of the robotic arm that controls the movement of the control housing (1). They form a circulation with the water tank (53) through the water inlet hose (551) and the water outlet hose (552).

2. The laser welding system based on a high-precision two-dimensional scanning head according to claim 1, characterized in that: The evaporation section (61) of the flexible heat pipe (6) is bonded and fixed to the top surface of the support base (34) by thermally conductive adhesive.

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