Laser cutting machine for metal sheet processing

Abstract

The present invention relates to the technical field of laser processing devices for metal sheets, and specifically to a laser cutting machine for processing metal sheets, comprising a machine tool, a movable crossbeam being slidably mounted on the upper end of the machine tool, and a frame being movably mounted on the upper end of the movable crossbeam, a movable frame being slidably mounted on the inner end of the frame, a laser for emitting laser being fixedly mounted on the inner end of the movable frame, the bottom end of the laser being fixedly connected to a lens barrel, and a focusing head being detachably mounted on the bottom end of the lens barrel for emitting high-temperature laser flow, a heating device for heating the gas being installed inside the uniform heating barrel, and the present invention adopts a heat exchange design of the lens barrel so that the coolant flowing through can preheat the low-temperature protective gas to reach the working temperature while absorbing heat. The integrated thermal management system can not only effectively control the temperature of the equipment to ensure stable operation, but also reduce the influence of temperature fluctuations on processing accuracy, thereby extending the service life of the equipment and improving the process quality.

Description

Technical Field

[0001] The present invention relates to the technical field of metal plate laser processing devices, in particular to a laser plate cutting machine for metal plate processing. Background Art

[0002] The laser cutting machine focuses the laser emitted from the laser into a high-power density laser beam through the optical path system. The laser beam is irradiated onto the surface of the workpiece, causing the workpiece to reach the melting point or boiling point. As the relative position of the beam and the workpiece moves, a slit is eventually formed in the material, thereby achieving the purpose of cutting. When processing metal plates, a metal plate laser cutting machine is also required.

[0003] After searching, it was found that the prior art publication number is CN113843523A, which discloses a laser cutting machine, including a base frame, a laser, a driving device for controlling the movement of the laser, and a detachable platform structure. The detachable platform structure includes two symmetrically arranged local workbenches, each local workbench includes a rack, a side support plate and an adjustment plate. A supporting beam installed on the base frame is provided between the two local workbenches. One end of the side support plate and the adjustment plate are detachably mounted on the base frame through a support assembly, and the other end is detachably connected to the supporting beam through a support plug plate. A plurality of racks are arranged across the two side support plates and are equidistantly arranged and mounted on the adjustment plate along the length direction of the side support plates. This solution is achieved by detachably connecting all components in the detachable platform structure. Even if the work platform requires local maintenance, there is no need to replace the entire work platform. Only the corresponding damaged components need to be replaced, which greatly saves maintenance costs and improves work efficiency.

[0004] Therefore, based on the above search and combined with existing technologies, in existing cutting equipment, when the protective gas needs to be preheated and kept at a constant temperature, this increases the additional heating demand and increases the overall energy consumption. The protective gas temperature of the existing equipment is closely related to the ambient temperature, and the gas temperature fluctuation affects the cutting stability, especially in different seasons or different working environments, which may lead to inconsistent cutting effects. For this reason, the present application proposes a laser cutting machine for metal sheet processing. Summary of the Invention

[0005] The object of the present invention is to provide a laser cutting machine for metal sheet processing to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a laser cutting machine for metal sheet processing, comprising a machine tool, a movable crossbeam slidably mounted on the upper end of the machine tool, and a frame movably mounted on the upper end of the movable crossbeam, a movable frame slidably mounted on the inner end of the frame, a laser for emitting laser fixedly mounted on the inner end of the movable frame, the bottom end of the laser fixedly connected to the lens barrel, and a focusing head detachably mounted on the bottom end of the lens barrel for emitting high-temperature laser flow, a heat-generating cylinder fixedly mounted on the bottom end of the movable frame through a clamp, an air jet fixedly mounted on the bottom end of the heat-generating cylinder, the outlet of the air jet facing below the focusing head, a heating device for heating the gas is installed inside the heat-generating cylinder, and an adjustment device is provided inside the lens barrel to adjust the laser focal length according to the cutting material.

[0007] As a further solution of the present invention, an output pipe for transmitting coolant is also provided inside the movable frame. The output end of the output pipe is connected to the uniform heating cylinder. The coolant is transported to the uniform heating cylinder through the output pipe to achieve efficient heat transfer, effectively reduce the equipment temperature, and prevent overheating from affecting the processing accuracy and equipment life.

[0008] As a further solution of the present invention, the heating device includes an air guide cylinder, which is fixedly installed on the inner upper end of the uniform heating cylinder. An air plug cover is fixedly installed on the upper end of the uniform heating cylinder. The output pipe is passed through the interior of the air plug cover. The end of the air guide cylinder away from the air plug cover is fixedly connected to the compression cylinder. The bottom end of the compression cylinder is provided with a liquid outlet pipe, and the liquid outlet pipe is connected to the output pipe. The output pipe is passed through the interior of the air plug cover, so that the coolant can smoothly enter the uniform heating cylinder and be evenly transmitted through the air guide cylinder and the compression cylinder, ensuring that the coolant is more evenly distributed and improving the cooling effect.

[0009] As a further solution of the present invention, an isolation plate is provided on the side of the compression cylinder away from the air plug cover, and the isolation plate is fixedly connected to the heat uniforming cylinder. The end of the isolation plate away from the compression cylinder is fixedly connected to a heat conduction pipe, and the outer surface of the heat conduction pipe is wound with a heat conduction air pipe. By winding the heat conduction air pipe on the outer surface of the heat conduction pipe, the cooling system can make full use of the heat, achieve more uniform heat conduction, improve the overall temperature control effect, and avoid local overheating or insufficient cooling.

[0010] As a further solution of the present invention, the end of the heat-conducting air pipe away from the isolation plate is connected to the air injection pipe, the outer surface of the lens barrel is provided with heat dissipation fins, and a cooling pipe is passed through the inside of the heat dissipation fins, the input end of the cooling pipe is fixedly connected to the output end of the heat uniforming barrel, and the output end of the cooling pipe is connected to the input end of the heat uniforming barrel. By arranging heat dissipation fins on the outer surface of the lens barrel and passing a cooling pipe through the inside thereof, the heat dissipation area is greatly increased, the heat transfer efficiency is improved, the equipment temperature is effectively reduced, and long-term stable operation is ensured.

[0011] As a further solution of the present invention, a bimetallic spiral piece is fixedly installed on the inner bottom end of the heat pipe, a driving block is rotatably installed on the inner end of the heat pipe, and the end of the bimetallic spiral piece close to the isolation plate is fixedly connected to the driving block. A movable cylinder is passed through the inner end of the heat pipe. Due to the thermal expansion and contraction characteristics of the bimetallic spiral piece, it is deformed at different temperatures, driving the driving block to rotate, thereby dynamically adjusting the fluid flow state in the heat pipe, improving the heat exchange efficiency, and ensuring that the cooling or heating system is always in the best working state.

[0012] As a further solution of the present invention, the upper end of the driving block is fixedly connected to a screw, and the movable cylinder is threadedly sleeved on the outer surface of the screw. The liquid outlet pipe and the outer surface of the movable cylinder are both provided with rectangular liquid outlet holes, and the liquid outlet holes of the two correspond to each other. Through the threaded connection structure of the movable cylinder and the screw, the axial position of the movable cylinder can be adjusted so that the rectangular liquid outlet hole on its outer surface and the liquid outlet hole of the liquid outlet pipe are staggered or aligned with each other, thereby accurately controlling the liquid outlet flow rate, meeting the requirements of different working conditions, and improving the stability of fluid transportation.

[0013] As a further solution of the present invention, the adjusting device includes a conduction tube, which is passed through the interior of the lens barrel, a driving rod is passed through the inner end of the conduction tube, a plurality of heat-conducting plates are slidably installed on the inner end of the lens barrel, a lens is provided inside the lens barrel, and the bottom end of the conduction tube is fixedly connected to a liquid outlet cylinder, and the output end of the liquid outlet cylinder is located below.

[0014] As a further solution of the present invention, the liquid outlet tube is arranged inside a plurality of heat-conducting plates, and reflux holes are provided on the outer surfaces of the heat-conducting plates. A reflux groove is provided inside the lens barrel, and the reflux groove corresponds to the reflux hole. The liquid outlet tube is arranged inside a plurality of heat-conducting plates. Through the efficient conduction effect of the heat-conducting plates, it helps to quickly transfer heat from the equipment and improve the overall heat dissipation effect.

[0015] As a further solution of the present invention, a driving cylinder is passed through the bottom end of the conduction tube, and a through hole is opened on the outer surface of the heat conducting plate. The driving cylinder is passed through the through hole, and a driving screw is provided on the inner end thread sleeve of the driving cylinder, and the driving screw is fixedly connected to the driving rod. A plurality of push baffles are fixedly installed on the outer surface of the driving cylinder, and the push baffles and the heat conducting plate are staggered with each other.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention uses a heat exchange design in the lens barrel to allow the coolant flowing through it to absorb heat while preheating the cryogenic protective gas to its operating temperature. This integrated thermal management system can effectively control the equipment temperature to ensure stable operation while reducing the impact of temperature fluctuations on processing accuracy, thereby extending the equipment life and improving process quality.

[0018] 2. When the present invention is working, the preheated shielding gas can significantly improve the cutting efficiency and processing stability of highly reflective and thick materials. At the same time, it can still maintain a suitable temperature for low-reflective materials to ensure processing quality. The waste heat of the reflux gas in the recycling cooling pipe is recovered for heating without the need for an additional heat source, which not only reduces energy consumption but also improves the overall thermal energy utilization efficiency, achieving optimal thermal matching under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a laser cutting machine for metal sheet processing;

[0020] Figure 2 Schematic diagram of the structure inside the rack;

[0021] Figure 3 This is a disassembled diagram of the rack;

[0022] Figure 4 Schematic diagram of the internal structure of the heat-uniform cylinder;

[0023] Figure 5 Schematic diagram of the structure inside the heat pipe;

[0024] Figure 6 Schematic diagram of the structure inside the liquid outlet pipe;

[0025] Figure 7 It is a structural diagram of the positional relationship between the heat-uniform cylinder and the air guide cover;

[0026] Figure 8 Schematic diagram of the structure inside the compression cylinder;

[0027] Figure 9 The relationship diagram between the lens barrel and the focusing head;

[0028] Figure 10 Schematic diagram of the internal structure of the lens barrel;

[0029] Figure 11 Schematic diagram of the heat conducting plate structure.

[0030] In the figure: 1. Machine tool; 2. Movable crossbeam; 3. Machine frame;

[0031] 101. Cable; 102. Movable frame; 103. Laser; 104. Heat sink; 105. Focusing head; 106. Air jet; 107. Heat-dissipating cylinder; 108. Adjustment motor; 109. Vertical screw; 110. Return pipe; 111. Output pipe; 112. Stepper motor;

[0032] 201, air plug cover; 202, air guide cylinder; 203, compression cylinder; 204, liquid outlet pipe; 205, transfer pipe; 206, isolation plate; 207, heat pipe; 208, heat pipe; 209, bimetallic spiral blade; 210, drive block; 211, movable cylinder; 212, screw; 213, liquid outlet hole;

[0033] 301, air guide cover; 302, passive turbofan; 303, compression chamber;

[0034] 401. Cooling tube; 402. Driving rod; 403. Conducting tube; 404. Lens barrel; 405. Connecting barrel; 406. Heat conducting plate; 407. Lens; 408. Reflux groove; 409. Driving barrel; 410. Pushing baffle; 411. Reflux hole; 412. Liquid outlet barrel; 413. Driving screw. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 - Figure 3 A laser cutting machine for processing metal sheets includes a machine tool 1, a movable crossbeam 2 is slidably mounted on the upper end of the machine tool 1, and a frame 3 is movably mounted on the upper end of the movable crossbeam 2. Specifically, a servo drive device is provided inside the machine tool 1 and the movable crossbeam 2 to respectively realize the forward and backward movement of the movable crossbeam 2 and the left and right movement of the frame 3 on the Y axis. The drive device is an existing mature technology, and the specific device and working principle are not described in detail here. A movable frame 102 is slidably mounted on the inner end of the frame 3, and the inner end of the movable frame 102 is fixedly mounted with a clamp. The laser 103 is used to emit laser light. The bottom end of the laser 103 is fixedly connected to the lens barrel 404, and the bottom end of the lens barrel 404 is detachably mounted with a focusing head 105 for emitting a high-temperature laser stream. The bottom end of the movable frame 102 is fixedly mounted with a uniform heating cylinder 107 via a clamp. The bottom end of the uniform heating cylinder 107 is fixedly mounted with an air jet 106. The emission port of the air jet 106 faces the laser cutting position. The gas ejected by the air jet 106 is a shielding gas (the shielding gas type is not unique), which has the effect of reducing spatter, stabilizing the molten pool, and preventing oxidation of the incision.

[0037] The uniform heating cylinder 107 is internally provided with a temperature raising device for heating the gas, and the lens barrel 404 is internally provided with an adjusting device for adjusting the laser focal length according to the cutting material.

[0038] An adjustment motor 108 is fixedly mounted on the inner end of the frame 3 by bolts. The output end of the adjustment motor 108 is fixedly connected to a vertical screw rod 109. The movable frame 102 is threadedly sleeved on the outer surface of the vertical screw rod 109. The output end of the adjustment motor 108 drives the vertical screw rod 109 to rotate, thereby driving the movable frame 102 to move up and down (Z axis).

[0039] Specifically, a cable 101 is provided at the upper end of the rack 3, and the cable 101 is used to provide power to various electrical appliances inside the rack 3. An output pipe 111 for transmitting coolant is also provided inside the movable rack 102, and the output end of the output pipe 111 is connected to the uniform heating cylinder 107. Specifically, the output pipe 111 has two output ports, one of which is connected to the uniform heating cylinder 107, and the other is connected to the lens barrel 404.

[0040] See also Figure 2 、 Figure 3 、 Figure 9 The heating device includes an air guide cylinder 202, which is fixedly mounted on the inner upper end of the uniform heating cylinder 107. An air plug cover 201 is fixedly mounted on the upper end of the uniform heating cylinder 107. The output pipe 111 is passed through the interior of the air plug cover 201. The end of the air guide cylinder 202 away from the air plug cover 201 is fixedly connected to a compression cylinder 203. A liquid outlet pipe 204 is provided at the bottom end of the compression cylinder 203, and the liquid outlet pipe 204 is connected to the output pipe 111.

[0041] An isolation plate 206 is provided on the side of the compression cylinder 203 away from the air plug cover 201. The isolation plate 206 is fixedly connected to the uniform heat cylinder 107. A heat pipe 207 is fixedly welded to the end of the isolation plate 206 away from the compression cylinder 203. The heat pipe 207 is passed through the interior of the uniform heat cylinder 107. A heat pipe 208 is wound around the outer surface of the heat pipe 207. The heat pipe 208 is spirally wound around the outer surface of the heat pipe 207. Both are made of metal and have good thermal conductivity. The structure increases the contact area between the heat conducting air pipe 208 and the heat conducting pipe 207, and the end of the heat conducting air pipe 208 away from the isolation plate 206 is connected to the air injection pipe 106. The outer surface of the lens barrel 404 is provided with a heat dissipation fin 104, and the interior of the heat dissipation fin 104 is penetrated by a cooling pipe 401. The cooling pipe 401 is spirally wound. The input end of the cooling pipe 401 is fixedly connected to the output end of the uniform heat barrel 107, and the output end of the cooling pipe 401 is connected to the input end of the uniform heat barrel 107.

[0042] Specifically, the isolation plate 206 divides the interior of the uniform heating cylinder 107 into two upper and lower chambers, wherein the input end of the cooling tube 401 is connected to the chamber above the isolation plate 206, and the output end is connected to the chamber below the isolation plate 206. A gas supply device for providing protective gas is also provided on the outside of the machine tool 1 (not shown in the figure). This device is an existing mature technology, and the specific working principle will not be elaborated here. The upper end of the gas plug cover 201 is fixedly connected to an air pipe, and the air pipe is connected to the output end of the gas supply device.

[0043] Example 2: Please refer to Figure 4 - Figure 8 A laser cutting machine for metal plate processing, based on the basis of embodiment 1, a bimetallic spiral piece 209 is fixedly installed at the inner bottom end of the heat pipe 207. The bimetallic spiral piece 209 is composed of two metals with different expansion coefficients. It is an existing mature technology and will not be described in detail here. A driving block 210 is rotatably installed at the inner end of the heat pipe 207, and the end of the bimetallic spiral piece 209 close to the isolation plate 206 is fixedly connected to the driving block 210. A movable cylinder 211 is passed through the inner end of the heat pipe 207. The movable cylinder 211 The outer surface of the movable cylinder 211 is provided with a sealing rubber ring, which fits tightly with the inner wall of the heat conducting pipe 207 to improve the sealing performance. Specifically, a rectangular groove is provided on the outer surface of the movable cylinder 211, and a rectangular block is fixedly installed on the inner end of the heat conducting pipe 207. The rectangular block is arranged in the rectangular groove to prevent the movable cylinder 211 from rotating. In addition, two limiting rings are fixedly welded to the inner end of the liquid outlet pipe 204. The two limiting rings are respectively located on the upper and lower sides of the movable cylinder 211, so that the movable cylinder 211 can only move freely up and down in the space between the two limiting rings.

[0044] like Figure 5 、 Figure 6 As shown, a screw 212 is fixedly welded to the upper end of the driving block 210, and a movable cylinder 211 is threadedly sleeved on the outer surface of the screw 212. Rectangular liquid outlet holes 213 are provided on the outer surfaces of the liquid outlet pipe 204 and the movable cylinder 211, and the liquid outlet holes 213 of the two correspond to each other. When the movable cylinder 211 contacts the lower limiting ring, the two liquid outlet holes 213 are staggered with each other, revealing a smaller aperture. As the movable cylinder 211 moves upward, the aperture gradually increases. When the movable cylinder 211 contacts the upper limiting ring, the two liquid outlet holes 213 are completely horizontally aligned.

[0045] An air guide cover 301 is fixedly connected to one end of the air guide cylinder 202 near the isolation plate 206. A passive turbofan 302 is rotatably mounted on the inner end of the air guide cover 301. The passive turbofan 302 is divided into two layers, with the inner and outer layers separated by an isolation tube. The passive turbofan 302 located in the inner layer corresponds to the output pipe 111. The isolation tube and the air guide cover 301 are separated by a sealed bearing, so that the liquid flowing in the output pipe 111 is completely isolated from the gas flowing in the air guide cover 301. The air guide cover 301 is connected to the heat transfer gas pipe 208 via a transfer pipe 205.

[0046] Specifically, the compression cylinder 203 is "hourglass-shaped", that is, it is thin in the middle and thick at both ends. The central part of the compression cylinder 203 is used for the flow of liquid. A plurality of compression chambers 303 are provided at the inner end of the compression cylinder 203. The plurality of compression chambers 303 are arranged in a ring shape, and the space at the center is smaller than the space at both ends, so that the air is compressed when flowing through, and then the pressure is quickly released, resulting in a decrease in the gas temperature under the adiabatic expansion refrigeration effect (Joule-Thomson effect). The compression cylinder 203 is made of metal and has good thermal conductivity. A plurality of through grooves are provided on the outer surface of the compression cylinder 203, so that the liquid can have more contact area with the compression cylinder 203, thereby improving the efficiency of heat conduction.

[0047] See also Figure 3 、 Figure 9 - Figure 11 The adjusting device includes a conductive tube 403, which is arranged inside the lens barrel 404. The inner end of the conductive tube 403 is penetrated by a driving rod 402. The upper end of the lens barrel 404 is provided with a stepping motor 112. The output end of the stepping motor 112 is fixedly connected to the driving rod 402. The end of the lens barrel 404 close to the focusing head 105 is detachably mounted with a connecting tube 405. The bottom end of the connecting tube 405 is penetrated by the interior of the focusing head 105. The inner end of the lens barrel 404 is slidably mounted with multiple A heat conducting sheet 406 is provided, a lens 407 is provided inside the lens barrel 404, a movable chamber is opened in the lens barrel 404, the heat conducting sheet 406 is arranged in the movable chamber, and the lens 407 is connected to the lowest heat conducting sheet 406. Specifically, a metal sleeve is further provided on the outer surface of the lens 407, and multiple heat conducting sheets 406 are all provided on the outer surface of the metal sleeve. A sealing rubber ring is provided on the outer surface of the metal sleeve and is in contact with the inner wall of the lens barrel 404 to prevent liquid from splashing onto the outer surface of the lens 407.

[0048] like Figure 9 - Figure 11As shown, the outer surface of the heat conducting sheet 406 is provided with a reflux hole 411, the interior of the lens barrel 404 is provided with a reflux groove 408, the reflux groove 408 corresponds to the reflux hole 411, the bottom end of the conduction tube 403 is fixedly connected with a liquid discharge cylinder 412, the liquid discharge cylinder 412 is arranged inside the plurality of heat conducting sheets 406, the output end of the liquid discharge cylinder 412 is located below, the length of the liquid discharge cylinder 412 is greater than the maximum distance that the heat conducting sheet 406 moves, the bottom end of the conduction tube 403 is penetrated by a driving cylinder 409, the outer surface of the heat conducting sheet 406 is provided with a through hole, the driving cylinder 409 is penetrated in the through hole, the inner end of the driving cylinder 409 is threadedly sleeved with a driving screw 413, and the driving screw 413 is fixedly connected to the driving rod 402;

[0049] A plurality of push baffles 410 are fixedly mounted on the outer surface of the driving cylinder 409. The push baffles 410 and the heat conducting fins 406 are interlaced with each other, and the heat conducting fins 406 can move freely between two adjacent push baffles 410. Specifically, the bottom heat conducting fin 406 is fixedly connected to the driving cylinder 409. When the driving cylinder 409 moves downward and drives the bottom heat conducting fin 406 downward, the metal sleeve also moves downward. As the area of ​​the metal sleeve exposed in the movable chamber increases, the contact area of ​​the remaining heat conducting fins 406 with it increases, thereby increasing the heat dissipation area.

[0050] The focusing head 105 is also provided with multiple sets of lenses 407 for further amplifying the energy of the laser beam.

[0051] like Figure 2 、 Figure 3 As shown, the outer surface of the uniform heating cylinder 107 is fixedly connected to a return pipe 110, the return pipe 110 is connected to the chamber below the isolation plate 206, and the return pipe 110 is connected to the return groove 408. The interior of the frame 3 is provided with a laser cooling system (not shown in the figure) for dissipating heat from the coolant. The specific working principle of the device is an existing mature technology and will not be described in detail here. The output pipe 111 is fixedly connected to the output end of the laser cooling system through a three-way pipe, and the return pipe 110 is also fixedly connected to the input end of the laser cooling system through a three-way pipe, wherein the other output end of the output pipe 111 is connected to the conduction pipe 403.

[0052] The working principle of the present invention is:

[0053] During use, the metal sheets to be cut are placed on the machine tool 1 in sequence, and the X-axis and Y-axis drive the focusing head 105 to the top of the sheet to be cut. As the laser 103 is started, the emitted laser is focused by the lens 407, and then a high-temperature laser beam is emitted to cut the sheet. The protective gas enters from the gas plug cover 201 and enters the interior of the compression cylinder 203 through the gas guide cylinder 202. When passing through the compression chamber 303, the gas temperature is reduced due to the adiabatic expansion refrigeration effect, so that the coolant flowing through the outer surface of the compression cylinder 203 is cooled again. The high temperature of the outer surface of the lens barrel 404 is maintained at a constant temperature as the coolant in the cooling tube 401 flows. When the protective gas passes through the passive turbofan 302, the passive turbofan 302 also rotates, thereby making the coolant in the output tube 111 flow faster.

[0054] Since the absorption rate of laser by different materials (such as copper and steel) varies significantly, it is necessary to adjust the focal length of the lens 407 to optimize the light spot, so the working temperature also increases. The output end of the stepper motor 112 drives the driving rod 402 to rotate, so that the driving screw 413 drives the driving cylinder 409 to move downward, so that the metal sleeve also moves downward. As the area of ​​the metal sleeve exposed in the movable chamber increases, the contact area of ​​the remaining multiple heat conducting plates 406 with it increases, thereby increasing the heat dissipation area. The coolant passes through the reflux hole 411 and reaches the reflux groove 408 and then flows back to the laser cooling system. As the temperature rises, the bimetallic spiral plate 209 is heated and distorted. The screw 212 is driven to rotate by the driving block 210, so that the movable cylinder 211 moves upward, so that the volume of the coolant flowing through the outlet hole 213 becomes larger, so that it can take away more heat, so that a stable working temperature can be maintained during the laser cutting process.

[0055] Since the temperature of the gas flowing back from the cooling pipe 401 to the chamber below the isolation plate 206 is higher than the ambient temperature, the heat conducting gas pipe 208 is heated, and the protective gas flowing inside is also heated. Since the gas flows too fast, the temperature of the sprayed protective gas is higher than the storage temperature. For cutting highly reflective materials or thicker materials, higher temperature gas is required to help blow away the slag and preheat the plate. For low reflective materials, the required power is lower and the working temperature is also lower. At this time, the temperature of the sprayed protective gas will not be too high, so it will not affect normal operation.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A laser cutting machine for metal sheet processing, comprising a machine tool (1), characterized in that: A movable crossbeam (2) is slidably mounted on the upper end of the machine tool (1), and a frame (3) is movably mounted on the upper end of the movable crossbeam (2), a movable frame (102) is slidably mounted on the inner end of the frame (3), a laser (103) for emitting laser light is fixedly mounted on the inner end of the movable frame (102), the bottom end of the laser (103) is fixedly connected to the lens barrel (404), and a focusing head (105) is detachably mounted on the bottom end of the lens barrel (404), a uniform heating cylinder (107) is fixedly mounted on the bottom end of the movable frame (102) through a clamp, an air jet (106) is fixedly mounted on the bottom end of the uniform heating cylinder (107), an outlet of the air jet (106) faces below the focusing head (105), a heating device for heating gas is installed inside the uniform heating cylinder (107), and an adjustment device is provided inside the lens barrel (404) so ​​as to adjust the laser focal length according to the cutting material; An output pipe (111) for transmitting cooling liquid is further provided inside the movable frame (102), and an output end of the output pipe (111) is connected to the uniform heating cylinder (107); The temperature raising device comprises an air guide cylinder (202), the air guide cylinder (202) being fixedly mounted on the inner upper end of the uniform heating cylinder (107), an air plug cover (201) being fixedly mounted on the upper end of the uniform heating cylinder (107), the output pipe (111) being passed through the interior of the air plug cover (201), an end of the air guide cylinder (202) away from the air plug cover (201) being fixedly connected to a compression cylinder (203), a liquid outlet pipe (204) being provided at the bottom end of the compression cylinder (203), and the liquid outlet pipe (204) being in communication with the output pipe (111); An isolation plate (206) is provided on a side of the compression cylinder (203) away from the air plug cover (201), the isolation plate (206) is fixedly connected to the heat-uniform cylinder (107), and a heat-conducting pipe (207) is fixedly connected to one end of the isolation plate (206) away from the compression cylinder (203), and a heat-conducting air pipe (208) is wound around the outer surface of the heat-conducting pipe (207); One end of the heat-conducting air pipe (208) away from the isolation plate (206) is connected to the air injection pipe (106); the outer surface of the lens barrel (404) is provided with a heat dissipation fin (104), and a cooling pipe (401) is passed through the interior of the heat dissipation fin (104); the input end of the cooling pipe (401) is fixedly connected to the output end of the uniform heat barrel (107), and the output end of the cooling pipe (401) is connected to the input end of the uniform heat barrel (107); A bimetallic spiral piece (209) is fixedly mounted on the inner bottom end of the heat conducting pipe (207), a driving block (210) is rotatably mounted on the inner end of the heat conducting pipe (207), and one end of the bimetallic spiral piece (209) close to the isolation plate (206) is fixedly connected to the driving block (210), and a movable cylinder (211) is passed through the inner end of the heat conducting pipe (207); The upper end of the driving block (210) is fixedly connected to a screw rod (212), and the movable cylinder (211) is threadedly sleeved on the outer surface of the screw rod (212). The outer surfaces of the liquid outlet pipe (204) and the movable cylinder (211) are both provided with rectangular liquid outlet holes (213), and the liquid outlet holes (213) of the two correspond to each other.

2. The laser cutting machine for metal sheet processing according to claim 1, characterized in that: The regulating device comprises a conduction tube (403), the conduction tube (403) being passed through the interior of the lens barrel (404), a driving rod (402) being passed through the inner end of the conduction tube (403), a plurality of heat conducting plates (406) being slidably mounted on the inner end of the lens barrel (404), a lens (407) being provided inside the lens barrel (404), a liquid outlet cylinder (412) being fixedly connected to the bottom end of the conduction tube (403), and an output end of the liquid outlet cylinder (412) being located at the bottom.

3. The laser cutting machine for metal sheet processing according to claim 2, characterized in that: The liquid outlet cylinder (412) is arranged inside a plurality of heat conducting plates (406), and the outer surfaces of the heat conducting plates (406) are each provided with a reflux hole (411). The interior of the lens barrel (404) is provided with a reflux groove (408), and the reflux groove (408) corresponds to the reflux hole (411).

4. The laser cutting machine for metal sheet processing according to claim 3, characterized in that: A driving cylinder (409) is provided at the bottom end of the conduction tube (403), and a through hole is provided on the outer surface of each heat conducting plate (406). The driving cylinder (409) is provided in the through hole. A driving screw (413) is provided on the inner end thread sleeve of the driving cylinder (409), and the driving screw (413) is fixedly connected to the driving rod (402). A plurality of push baffles (410) are fixedly installed on the outer surface of the driving cylinder (409), and the push baffles (410) and the heat conducting plate (406) are interlaced with each other.

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