Laser head cooling device

Abstract

The invention relates to the technical field of laser cutting equipment, and discloses a laser head cooling device which comprises a cutting head shell, a fixing sleeve is arranged at the bottom end of the cutting head shell, a ceramic ring is installed in the fixing sleeve, a nozzle is installed at the bottom end of the ceramic ring, a heat conduction groove is formed in the top end of the nozzle, a heat conduction ring is arranged in the heat conduction groove, and a silica gel pad is installed at the bottom end of the heat conduction ring. A sealing cavity is formed in the top of the fixing sleeve, an air pump is installed in the cutting head shell, the air outlet end of the air pump is connected with a sealing cavity pipeline, a piston plate is arranged at the bottom of the sealing cavity, a pressing plate is arranged at the bottom end of the piston plate and connected with the heat conduction ring, an anti-collision support is arranged on the fixing sleeve, and an air inlet is formed in the side portion of the anti-collision support and communicated with the fixing sleeve. The heat conduction ring exchanges heat with the nozzle through the silica gel pad, the contact area of the auxiliary gas and the heating element is increased through the heat conduction ring, meanwhile, the auxiliary gas adopts a lateral gas inlet mode, the heat dissipation path of the auxiliary gas is prolonged, and the heat dissipation effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of laser cutting equipment technology, and more specifically, to a laser head cooling device. Background Technology

[0002] The nozzle at the bottom of the laser cutting head is made of copper and is responsible for coaxially guiding the laser beam and auxiliary gas to form a high-pressure airflow to blow away molten slag and block spatter to protect the lens. The ceramic ring is an insulating and high-temperature resistant precision ring component installed between the nozzle and the cutting head body. It uses its own insulation effect to ensure the accuracy of the distance monitoring between the nozzle and the workpiece.

[0003] For example, Chinese invention patent CN117182352B discloses a laser cutting head, which includes an optical fiber connector, a first protective component, an optical module, a second protective component, and a nozzle blowing component connected in sequence. The nozzle blowing component includes a first sleeve, a first housing, and a nozzle. The first sleeve is provided with a first light-transmitting blowing channel. The first housing is sleeved on the first sleeve, and a first heat dissipation channel is formed between the first housing and the first sleeve. The first housing is provided with a cooling air channel, a first inlet, a first outlet, and a first air outlet. The first inlet and the first outlet are connected to the first heat dissipation channel, and the first air outlet is connected to the cooling air channel. The nozzle is connected to the first housing, and the first light-transmitting blowing channel is connected to the nozzle. The first air outlet is located on the side of the first housing near the nozzle. This invention overcomes the problem that existing cutting heads only design heat dissipation structures on the housing of the optical module, which cannot meet the heat dissipation requirements. It has the advantages of good heat dissipation and good cutting performance, and is suitable for high-power lasers.

[0004] In the aforementioned patents and existing technologies, the nozzle is mounted on a ceramic ring. Due to the installation gap, the heat transfer efficiency between the nozzle and the ceramic ring is limited. The heat from the nozzle cannot be smoothly conducted upwards, and the efficiency of heat exchange between the cooling gas and the nozzle is limited. This results in a longer downtime for the laser cutting head to cool down, making it impossible to quickly perform the next cutting operation. Summary of the Invention

[0005] The purpose of this invention is to provide a laser head cooling device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this solution provides a laser head cooling device, including a cutting head housing. A fixing sleeve is provided at the bottom of the cutting head housing, a ceramic ring is installed inside the fixing sleeve, a nozzle is installed at the bottom of the ceramic ring, a heat-conducting groove is formed at the top of the nozzle, a heat-conducting ring is provided inside the heat-conducting groove, a silicone pad is installed at the bottom of the heat-conducting ring, a sealing cavity is provided at the top of the fixing sleeve, an air pump is installed inside the cutting head housing, the air outlet of the air pump is connected to the sealing cavity pipe, a piston plate is provided at the bottom of the sealing cavity, a pressure plate is provided at the bottom of the piston plate, and the pressure plate is connected to the heat-conducting ring.

[0007] Optionally, the fixing sleeve is provided with an anti-collision bracket, and the side of the anti-collision bracket is provided with an air inlet, which is connected to the fixing sleeve.

[0008] Optionally, a pressure ring is provided at the top of the heat-conducting ring, and a pressure rod is installed on the pressure ring, with the other end of the pressure rod connected to the pressure plate.

[0009] Optionally, the pressure rod is slidably inserted into the pressure ring, and a buffer spring is sleeved on the pressure rod, with the other end of the buffer spring connected to the pressure ring.

[0010] Optionally, the inner wall of the fixed sleeve is provided with a protrusion, and a one-way valve is installed on the piston plate. After the piston plate abuts against the protrusion, the one-way valve opens.

[0011] Optionally, the through hole in the nozzle is configured as an inverted cone, a spring plate is provided at the bottom end of the pressure rod, a movable plate is installed at the bottom of the spring plate, the movable plate is configured as an arc plate, and the outer diameter of the movable plate is the same as the inner diameter of the nozzle outlet end; The movable plates are provided in pairs, and the pair of movable plates are located in the through hole of the nozzle. After the pressure rod moves down, the pair of movable plates retract.

[0012] Optionally, the heat-conducting ring is hollow, a nozzle is provided at the bottom of the heat-conducting ring, an air bag is installed between the pressure ring and the heat-conducting ring, the air outlet of the air bag is connected to the inside of the heat-conducting ring, and the nozzle sprays water mist after the air bag is compressed. The heat-conducting ring is disposed inside the ceramic ring, and the distance between the heat-conducting ring and the ceramic ring is greater than 5 mm.

[0013] Optionally, a sealing gasket is installed on the side of the spring sheet near the nozzle. The sealing gasket is a rubber gasket that abuts against the water spray end of the nozzle. When the spring sheet is deformed, the sealing gasket loses its seal on the nozzle.

[0014] Optionally, a limiting block is provided on the side of the heat-conducting ring, and a limiting rod is installed on the pressure ring. The limiting rod is located directly above the limiting block, and the airbag will no longer contract after the limiting rod abuts against the limiting block.

[0015] Optionally, the limiting rod is configured as a bolt, the limiting rod is threadedly connected to the pressure ring, and an anti-loosening spring is sleeved on the limiting rod, the anti-loosening spring abutting against the bolt cap at the top of the limiting rod.

[0016] The technical effects and advantages of the present invention are as follows: 1. The laser head undergoes phased cooling. During this time, the air pump starts, causing the heat-conducting ring to extend into the heat-conducting groove. Without affecting the heat dissipation of the nozzle by the auxiliary gas, the heat-conducting ring exchanges heat with the nozzle through the silicone pad. The heat of the nozzle itself is transferred upward to the heat-conducting ring, which significantly improves the heat dissipation rate of the nozzle. During heat dissipation, the auxiliary gas and the gas discharged from the one-way valve pass through the heat-conducting ring and the nozzle. The heat-conducting ring increases the contact area between the auxiliary gas and the heating element. At the same time, the auxiliary gas adopts a side-entry method, which extends the heat dissipation path of the auxiliary gas, further improving the heat dissipation effect and shortening the downtime for laser head cooling.

[0017] 2. The movable plate contacts the inner hole of the inverted conical nozzle. The pair of movable plates change from a separated state to a retracted state. During this process, the pair of movable plates gather the molten slag inside the movable plates. At the same time, after the movable plates retract, the inner diameter of the nozzle decreases, which speeds up the discharge speed of the auxiliary gas and helps the gas blow out the molten slag.

[0018] 3. The movable plate contacts the inner hole of the inverted conical nozzle, causing the spring plate to move downward and deform. The sealing gasket on the side of the spring plate loses its seal on the nozzle, and the nozzle sprays out fine water mist. Under the dual action of the auxiliary gas and the gas discharged by the one-way valve, the fine water mist evaporates rapidly and absorbs a large amount of heat, significantly improving the heat dissipation efficiency. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the fixing sleeve of the present invention; Figure 3 Appendix to this invention Figure 1 Enlarged structural diagram at point A; Figure 4 This is an exploded structural diagram of the nozzle, silicone pad, and heat-conducting ring of the present invention; Figure 5 Appendix to this invention Figure 4Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the structure of the heat-conducting groove and nozzle of the present invention; Figure 7 This is a schematic diagram of the structure of the movable plate and nozzle of the present invention; Figure 8 Appendix to this invention Figure 7 Enlarged structural diagram at point C; Figure 9 This is a schematic diagram of the structure of the movable plate and spring sheet of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 101, Cutting head housing; 102, Fixing sleeve; 103, Anti-collision bracket; 104, Air inlet; 105, Air pump; 106, Sealing cavity; 201, Nozzle; 202, Ceramic ring; 203, Heat-conducting ring; 204, Heat-conducting groove; 205, Silicone pad; 206, Nozzle; 301, Piston plate; 302, Movable plate; 303, One-way valve; 304, Protrusion; 305, Pressure plate; 306, Pressure rod; 307, Sealing gasket; 308, Buffer spring; 309, Pressure ring; 310, Airbag; 311, Limiting block; 312, Limiting rod; 313, Anti-loosening spring; 314, Spring plate. Detailed Implementation

[0021] To make the aforementioned objectives, features, and advantages of this solution more apparent and understandable, the specific embodiments of this solution are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this solution. However, this solution can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this solution. Therefore, this solution is not limited to the specific embodiments disclosed below.

[0022] According to some embodiments of this solution, a laser head cooling device is provided, for reference... Figures 1 to 9As shown, the laser head cooling device includes a cutting head housing 101. A fixing sleeve 102 is provided at the bottom of the cutting head housing 101. A ceramic ring 202 is detachably installed inside the fixing sleeve 102. A nozzle 201 is threadedly installed at the bottom of the ceramic ring 202. A heat-conducting groove 204 is formed at the top of the nozzle 201. A heat-conducting ring 203 is provided inside the heat-conducting groove 204. The heat-conducting ring 203 is made of copper. A silicone pad 205 is installed at the bottom of the heat-conducting ring 203. A sealing cavity 106 is provided at the top of the fixing sleeve 102. An air pump 105 is installed inside the cutting head housing 101. The air outlet of the air pump 105 is connected to the sealing cavity 106. The cavity 106 is connected to a pipe. A piston plate 301 is provided at the bottom of the sealed cavity 106. A pressure plate 305 is provided at the bottom end of the piston plate 301. The pressure plate 305 is a ceramic plate and is connected to the heat-conducting ring 203. After the air pump 105 is started, the air pump 105 fills the sealed cavity 106 with air. The air pressure inside the sealed cavity 106 increases, and the piston plate 301 moves downward. Specifically, a return spring is provided in the sealed cavity 106 to reset the piston plate 301. The other end of the return spring is connected to the piston plate 301. After the air pump 105 stops, the piston plate 301 resets under the tension of the return spring.

[0023] Thus, when the laser head is performing cutting operations, the heat-conducting ring 203 is located outside the nozzle 201 (in a cooled state). After the laser head finishes processing a workpiece or completing a stage of processing, it undergoes staged cooling. At this time, the air pump 105 starts, the air pressure inside the sealed cavity 106 increases, the piston plate 301 moves downward, and the piston plate 301 drives the heat-conducting ring 203 downward through the pressure plate 305, so that the heat-conducting ring 203 extends into the heat-conducting groove 204. Without affecting the heat dissipation of the auxiliary gas to the nozzle 201, the heat-conducting ring 203 exchanges heat with the nozzle 201 through the silicone pad 205, which significantly improves the heat dissipation rate of the nozzle 201. During heat dissipation, the auxiliary gas passes through the heat-conducting ring 203 and the nozzle 201. The heat-conducting ring 203 increases the contact area of ​​the heating element of the auxiliary gas, further improving the heat dissipation effect.

[0024] It should be noted that in this embodiment, the heat-conducting ring 203 exchanges heat with the nozzle 201 through the silicone pad 205. The silicone pad 205 needs to be replaced manually and periodically. In specific implementation, the silicone pad 205 can also be set as a corrugated pad made of copper. The heat-conducting ring 203 exchanges heat with the nozzle 201 through the corrugated pad. The corrugated pad itself can produce slight deformation to ensure the contact area between the heat-conducting ring 203 and the corrugated pad, and between the nozzle 201 and the corrugated pad.

[0025] Additionally, please refer to Figure 1 , Figure 2A collision-resistant bracket 103 is provided on the fixed sleeve 102. An air inlet 104 is provided on the side of the collision-resistant bracket 103. The air inlet 104 is connected to the air inlet pipe of the auxiliary gas and is connected to the fixed sleeve 102. In the prior art, the auxiliary gas passes directly through the nozzle 201. The inner wall of the nozzle 201 has a laminar flow phenomenon, and the heat exchange between the auxiliary gas and the nozzle 201 is insufficient. In this device, a side air inlet method is adopted. The auxiliary gas scours the outer wall of the heat-conducting ring 203. The auxiliary gas flows to the outside from the outer wall of the heat-conducting ring 203, the top of the heat-conducting ring 203, the inner side of the heat-conducting ring 203 and the nozzle 201, which greatly increases the heat conduction path of the auxiliary gas.

[0026] Please refer to Figure 2 A pressure ring 309 is provided on the top of the heat conduction ring 203, and a pressure rod 306 is installed on the pressure ring 309. The other end of the pressure rod 306 is connected to the pressure plate 305.

[0027] Furthermore, the pressure rod 306 is slidably inserted into the pressure ring 309, and a buffer spring 308 is sleeved on the pressure rod 306. The other end of the buffer spring 308 is connected to the pressure ring 309. When the bottom end of the heat-conducting ring 203 abuts against the heat-conducting groove 204, the pressure rod 306 continues to move downward, and the pressure rod 306 presses the bottom end of the heat-conducting ring 203 against the heat-conducting groove 204 through the buffer spring 308.

[0028] Please refer to Figure 2 The inner wall of the fixed sleeve 102 is provided with a protrusion 304, and a one-way valve 303 is installed on the piston plate 301. After the piston plate 301 abuts against the protrusion 304, the one-way valve 303 opens. The one-way valve 303 consists of a pipe and a baffle hinged in the pipe. The baffle is coordinated with a spring to ensure that the gas can only pass in one direction. The specific structure and function of the one-way valve 303 are well known to those skilled in the art and will not be described in detail here. Specifically, after the piston plate 301 abuts against the protrusion 304, the piston plate 301 no longer moves down. As the air pump 105 continues to pressurize, the air pressure inside the sealed cavity 106 increases, causing the one-way valve 303 to open, and the gas is discharged from the one-way valve 303 to participate in cooling.

[0029] Through the above technical solution, the laser head cooling device provided in this solution allows for phased cooling of the laser head during use. During this time, the air pump 105 starts, increasing the internal air pressure of the sealed cavity 106. The piston plate 301 moves downwards, and through the pressure plate 305 and pressure rod 306, the piston plate 301 drives the heat-conducting ring 203 downwards, causing it to extend into the heat-conducting groove 204. Without affecting the auxiliary gas's heat dissipation from the nozzle 201, the heat-conducting ring 203 exchanges heat with the nozzle 201 through the silicone pad 205. The heat from the nozzle 201 itself is transferred upwards to the heat-conducting ring 203, significantly improving cooling efficiency. The nozzle 201 has a high heat dissipation rate. During heat dissipation, the auxiliary gas passes through the heat-conducting ring 203 and the nozzle 201. The heat-conducting ring 203 increases the contact area of ​​the auxiliary gas's heating element, further improving the heat dissipation effect and reducing the laser head's downtime for cooling. This solves the problem mentioned in the background technology where the nozzle is installed on a ceramic ring, and due to the installation gap, the heat transfer efficiency between the nozzle and the ceramic ring is limited. The heat from the nozzle cannot be smoothly conducted upwards, and the efficiency of heat exchange between the heat dissipation gas and the nozzle is limited, resulting in a long downtime for the laser cutting head to cool down and preventing the next cutting operation from starting quickly.

[0030] It should be noted that in the prior art, the commonly used auxiliary gases for laser cutting heads are oxygen, nitrogen, and compressed air, with argon used in a few scenarios. Oxygen is sourced from industrial steel cylinders or oxygen generators, nitrogen comes from steel cylinders, liquid nitrogen vaporization, or nitrogen generators, and compressed air is supplied after purification by an air compressor. The air intake structure includes an air pump, an independent air path, and a mixing chamber. After pressure regulation and filtration, the gas is ejected coaxially with the laser beam. Among them, oxygen assists combustion and releases heat to increase the cutting speed of carbon steel, nitrogen provides inert purging to ensure that stainless steel and other materials do not have an oxide-free bright surface, and air is low-cost and takes into account both slag removal and cooling. All three types of gases can remove molten slag, cool the cut, and protect the cutting head lens, ensuring cutting quality and efficiency. In this embodiment, the auxiliary gas enters through the air inlet 104, which is connected to the gas pump pipeline of the auxiliary gas. Meanwhile, in order to ensure that the auxiliary gas does not leak from the installation gaps, in the prior art, a silicone gasket for sealing is provided between the fixed sleeve 102 and the ceramic ring 202, and between the ceramic ring 202 and the nozzle 201.

[0031] In some implementations of this solution, reference is made to Figure 7 , Figure 9 As shown, the through hole in the nozzle 201 is set in an inverted cone shape, and a spring plate 314 is provided at the bottom of the pressure rod 306. A movable plate 302 is installed at the bottom of the spring plate 314. The movable plate 302 is set as an arc plate. The outer diameter of the movable plate 302 is the same as the inner diameter of the outlet end of the nozzle 201. A pair of movable plates 302 are provided, and the pair of movable plates 302 are located in the through hole of the nozzle 201. After the pressure rod 306 moves down, the pair of movable plates 302 retract.

[0032] It should be noted that when the laser head is working, the workpiece will produce molten slag splashing. After the molten slag blocks the nozzle 201, it will obstruct the laser transmission path and affect the welding quality. Therefore, when the laser head is undergoing staged cooling, the pressure rod 306 moves downward. The pressure rod 306 drives the movable plate 302 to move downward through the spring plate 314. The movable plate 302 abuts against the inner hole of the inverted conical nozzle 201, causing the spring plate 314 to deform. The pair of movable plates 302 change from a separated state to a retracted state. During this process, the pair of movable plates 302 gather the molten slag inside the movable plates 302. At the same time, after the movable plates 302 retract, the inner diameter of the nozzle 201 decreases, which accelerates the discharge speed of the auxiliary gas and helps the gas blow out the molten slag.

[0033] In some implementations of this solution, reference is made to Figure 7 , Figure 8 As shown, the heat-conducting ring 203 is hollow and contains cleaning water. It has an inlet for replenishing the cleaning water. A nozzle 206, configured as a fine water mist nozzle, is located at the bottom of the heat-conducting ring 203. An air bladder 310, an elastic rubber air bladder with a spring inside, is installed between the pressure ring 309 and the heat-conducting ring 203. The air bladder 310 can automatically reset under the spring's action. Both the air inlet and outlet of the air bladder 310 are equipped with one-way valves. The air outlet of the air bladder 310 is connected to the interior of the heat-conducting ring 203. When the air bladder 310 is compressed, the nozzle 206 sprays water mist. The heat-conducting ring 203 is located inside the ceramic ring 202, and the distance between the heat-conducting ring 203 and the ceramic ring 202 is greater than 5 mm.

[0034] It should be noted that in this embodiment, clean water is manually injected into the heat-conducting ring 203 periodically. Alternatively, the bottom end of the heat-conducting ring 203 can be connected to a liquid cooling pipe in the prior art, so that the clean water inside the heat-conducting ring 203 is in a circulating state, keeping the heat-conducting ring 203 at a low temperature and improving the heat conduction effect of the heat-conducting ring 203.

[0035] Please refer to Figure 8 A sealing gasket 307 is installed on the side of the spring plate 314 near the nozzle 206. The sealing gasket 307 is a rubber gasket. A through groove is opened on the spring plate 314. The through groove is located above the sealing gasket 307. The sealing gasket 307 abuts against the water spray end of the nozzle 206. After the spring plate 314 is deformed, the sealing gasket 307 loses its seal against the nozzle 206.

[0036] Additionally, please refer to Figure 4 A limiting block 311 is provided on the side of the heat conduction ring 203, and a limiting rod 312 is installed on the pressure ring 309. The limiting rod 312 is located directly above the limiting block 311. After the limiting rod 312 abuts against the limiting block 311, the airbag 310 no longer contracts.

[0037] Please refer to Figure 5 The limiting rod 312 is a bolt, and the limiting rod 312 is threadedly connected to the pressure ring 309. An anti-loosening spring 313 is sleeved on the limiting rod 312, and the anti-loosening spring 313 abuts against the bolt cap at the top of the limiting rod 312.

[0038] It should be noted that by rotating the limiting rod 312, the distance between the bottom end of the limiting rod 312 and the limiting block 311 is changed, which further affects the contact time between the limiting rod 312 and the limiting block 311, thereby controlling the compression of the airbag 310. The spray volume of water mist from the nozzle 206 can be adjusted according to the specific working conditions. The anti-loosening spring 313 abuts against the bolt cap at the top of the limiting rod 312 through the washer, increasing the rotation resistance of the limiting rod 312 and preventing the limiting rod 312 from rotating under vibration, thus ensuring that the spray volume of water mist from the nozzle 206 is relatively accurate.

[0039] Specifically, the principle behind this device's enhanced heat dissipation through fine water mist is as follows: During the phased cooling of the laser head, the air pump 105 starts, increasing the air pressure inside the sealed cavity 106. The piston plate 301 moves downwards, compressing the airbag 310 via the pressure plate 305. Gas from the airbag 310 enters the heat-conducting ring 203, increasing the water pressure inside. The heat-conducting ring 203 then contacts the heat-conducting groove 204, preventing further downward movement. The pressure rod 306 moves downward, and the pressure rod 306 drives the movable plate 302 to move downward through the spring plate 314. The movable plate 302 abuts against the inner hole of the inverted conical nozzle 201, causing the spring plate 314 to deform as it moves downward. The sealing gasket 307 on the side of the spring plate 314 loses its seal on the nozzle 206, and the nozzle 206 sprays out fine water mist. Under the dual action of the auxiliary gas and the gas discharged by the one-way valve 303, the fine water mist evaporates rapidly and absorbs a large amount of heat, significantly improving the heat dissipation efficiency.

[0040] The preferred embodiments of this solution have been described in detail above with reference to the accompanying drawings. However, this solution is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this solution, various simple modifications can be made to the technical solution, and these simple modifications all fall within the protection scope of this solution.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this solution will not describe the various possible combinations separately.

[0042] Furthermore, various implementations of this solution can be combined in any way, as long as they do not violate the spirit of this solution, they should also be regarded as the content disclosed in this solution.

Claims

1. A laser head cooling device, comprising a cutting head housing (101), wherein a fixing sleeve (102) is provided at the bottom end of the cutting head housing (101), a ceramic ring (202) is installed inside the fixing sleeve (102), and a nozzle (201) is installed at the bottom end of the ceramic ring (202), characterized in that: The nozzle (201) has a heat-conducting groove (204) at the top, and a heat-conducting ring (203) is provided in the heat-conducting groove (204). A silicone pad (205) is installed at the bottom of the heat-conducting ring (203). A sealing cavity (106) is provided at the top of the fixing sleeve (102). An air pump (105) is installed in the cutting head housing (101). The air outlet of the air pump (105) is connected to the sealing cavity (106) through a pipe. A piston plate (301) is provided at the bottom of the sealing cavity (106). A pressure plate (305) is provided at the bottom of the piston plate (301). The pressure plate (305) is connected to the heat-conducting ring (203).

2. The laser head cooling device according to claim 1, characterized in that: The fixed sleeve (102) is provided with a collision protection bracket (103), and the side of the collision protection bracket (103) is provided with an air inlet (104), which is connected to the fixed sleeve (102).

3. The laser head cooling device according to claim 1, characterized in that: The top of the heat-conducting ring (203) is provided with a pressure ring (309), and a pressure rod (306) is installed on the pressure ring (309). The other end of the pressure rod (306) is connected to the pressure plate (305).

4. A laser head cooling device according to claim 3, characterized in that: The pressure rod (306) is slidably inserted into the pressure ring (309), and a buffer spring (308) is sleeved on the pressure rod (306). The other end of the buffer spring (308) is connected to the pressure ring (309).

5. A laser head cooling device according to claim 1, characterized in that: The inner wall of the fixed sleeve (102) is provided with a protrusion (304), and a one-way valve (303) is installed on the piston plate (301). After the piston plate (301) abuts against the protrusion (304), the one-way valve (303) opens.

6. A laser head cooling device according to claim 4, characterized in that: The through hole inside the nozzle (201) is configured as an inverted cone shape. A spring plate (314) is provided at the bottom end of the pressure rod (306). A movable plate (302) is installed at the bottom of the spring plate (314). The movable plate (302) is configured as an arc plate. The outer diameter of the movable plate (302) is the same as the inner diameter of the outlet end of the nozzle (201). The movable plates (302) are provided in pairs, and the pair of movable plates (302) are located in the through hole of the nozzle (201). After the pressure rod (306) moves down, the pair of movable plates (302) retract.

7. A laser head cooling device according to claim 6, characterized in that: The heat-conducting ring (203) is hollow, and a nozzle (206) is provided at the bottom of the heat-conducting ring (203). An air bag (310) is installed between the pressure ring (309) and the heat-conducting ring (203). The air outlet of the air bag (310) is connected to the inside of the heat-conducting ring (203). When the air bag (310) is compressed, the nozzle (206) sprays out water mist. The heat-conducting ring (203) is disposed inside the ceramic ring (202), and the distance between the heat-conducting ring (203) and the ceramic ring (202) is greater than 5 mm.

8. A laser head cooling device according to claim 7, characterized in that: A sealing gasket (307) is installed on the side of the spring sheet (314) near the nozzle (206). The sealing gasket (307) is a rubber gasket. The sealing gasket (307) abuts against the water spray end of the nozzle (206). After the spring sheet (314) is deformed, the sealing gasket (307) loses its seal on the nozzle (206).

9. A laser head cooling device according to claim 7, characterized in that: The heat-conducting ring (203) is provided with a limiting block (311) on its side, and a limiting rod (312) is installed on the pressure ring (309). The limiting rod (312) is located directly above the limiting block (311). After the limiting rod (312) abuts against the limiting block (311), the airbag (310) will no longer contract.

10. A laser head cooling device according to claim 9, characterized in that: The limiting rod (312) is a bolt, and the limiting rod (312) is threadedly connected to the pressure ring (309). An anti-loosening spring (313) is sleeved on the limiting rod (312), and the anti-loosening spring (313) abuts against the bolt cap at the top of the limiting rod (312).

Images