A laser cutting machine capable of slag removal

Abstract

The utility model discloses a laser cutting machine can remove dregs, including frame, be equipped with laser cutting device, front chuck and rear chuck on the frame, the laser cutting machine still includes first liquid injection device, is equipped with the liquid injection channel of just for the rear end of pipe material in the rear chuck, and the first liquid injection device is connected with the liquid injection channel, and the first liquid injection device can spray cutting fluid to the pipe material in through the liquid injection channel. The rear chuck is equipped with the liquid injection channel, when the rear chuck clamps the rear end of pipe material, the first liquid injection device can spray cutting fluid to the rear end inside of pipe material through the liquid injection channel. When laser cutting processing, the cutting fluid flows to the processing part of front side in the inside of pipe material, because the inside of pipe material processing part has cutting fluid, cutting fluid can reduce the molten slag adhesion in pipe inner wall and reduce dust generation, and cutting fluid flow can flush out the molten slag in pipe material, make in cutting processing's while can improve the cleanliness in pipe, reduce secondary processing cost.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting technology, and in particular to a laser cutting machine capable of removing slag. Background Technology

[0002] During laser cutting of metal pipes, the high-energy laser beam melts the metal, producing slag. Some of this slag adheres to the inside of the pipe. Upon cooling, this slag hardens, resulting in roughness at the cut location and inside the pipe, affecting the quality of the finished product. This may require subsequent manual or mechanical grinding for removal, increasing production time and costs. Furthermore, the cutting process generates metal particles and spatter, forming fine dust that pollutes the working environment and may affect equipment operation. Utility Model Content

[0003] The main purpose of this invention is to propose a slag-removing laser cutting machine, which aims to solve the technical problems of molten slag adhering to the inside of pipes and generating dust during laser cutting in the prior art.

[0004] To achieve the above objectives, this utility model proposes a slag-removing laser cutting machine, including a frame on which a laser cutting device, a front chuck, and a rear chuck are mounted. The laser cutting device and the front chuck are both located in front of the rear chuck. The rear chuck is capable of moving relative to the front chuck in a front-back direction. The laser cutting machine also includes a first liquid spraying device. The rear chuck has a liquid spraying channel facing the rear end of the pipe. The first liquid spraying device is connected to the liquid spraying channel and can spray cutting fluid into the pipe through the liquid spraying channel.

[0005] The rear chuck is equipped with a liquid spraying channel. When the rear chuck clamps the rear end of the tube, the first liquid spraying device can spray cutting fluid into the rear end of the tube through the spraying channel. During laser cutting, the cutting fluid flows from inside the tube towards the processing area. Because there is cutting fluid inside the processing area of ​​the tube, the cutting fluid can reduce slag adhesion to the inner wall of the tube and reduce dust generation. Furthermore, the flow of cutting fluid can wash out the slag inside the tube, thereby improving the cleanliness of the tube during cutting and reducing secondary processing costs.

[0006] Preferably, the laser cutting machine further includes a second liquid spraying device, which is located on the front side of the laser cutting device and is capable of spraying cutting fluid into the front end of the pipe.

[0007] Before a new pipe is loaded and cutting begins, the second spraying device sprays cutting fluid into the front end of the pipe, ensuring that the cutting area is quickly equipped with cutting fluid. This allows for a rapid start to cutting, reducing the waiting time required for the cutting fluid to reach the front end of the pipe from the rear end due to its long length, thus improving processing efficiency.

[0008] Preferably, the second spraying device includes a second spraying moving mechanism and a second nozzle. The second nozzle is tractively connected to the second spraying moving mechanism. The second nozzle faces the rear side. The second spraying moving mechanism can drive the second nozzle to move closer to or away from the clamping centerline of the front chuck.

[0009] When cutting fluid needs to be sprayed, the second spraying mechanism moves the second nozzle closer to the clamping centerline of the front chuck, i.e., closer to the front of the pipe, so that the second nozzle can spray cutting fluid more accurately into the front end of the pipe. During processing, the second spraying mechanism moves the second nozzle away from the clamping centerline of the front chuck, i.e., away from the front of the pipe, so as not to obstruct the forward transport of the pipe.

[0010] Preferably, the laser cutting device includes a cutting moving device and a cutting head, wherein the cutting head, the second liquid spraying moving mechanism and the second nozzle are all disposed on the moving end of the cutting moving device.

[0011] Preferably, the laser cutting machine further includes a liquid receiving tank, which is located below the laser cutting device. The liquid receiving tank can receive cutting fluid flowing out from the front side of the pipe. The first liquid spraying device includes a first liquid supply pump, which is connected to the liquid receiving tank. A first liquid supply pipe is connected between the first liquid supply pump and the liquid spraying channel. The first liquid supply pump can supply the cutting fluid in the liquid receiving tank to the liquid spraying channel.

[0012] After the cutting fluid flows out from the front end of the pipe, it falls into the receiving tank for collection. The first supply pump then supplies the cutting fluid in the receiving tank to the spray channel and sprays the cutting fluid onto the front end of the pipe, thus forming a recycling of the cutting fluid and reducing the amount used.

[0013] Preferably, the liquid receiving tank has an upper liquid receiving tank on the upper layer and a lower filter tank on the lower layer. A drain hole is provided on one side of the upper liquid receiving tank. The first liquid supply pump is located in the lower filter tank and is located on the side away from the drain hole. The lower filter tank is provided with a filter plate for filtering impurities in the cutting fluid.

[0014] The cutting fluid flowing from the front end of the pipe first falls into the upper receiving tank located on the upper layer, and then flows through the drain hole to the lower filter tank located on the lower layer. After the cutting fluid passes through the filter plate in the lower filter tank to filter impurities, the first supply pump then supplies the filtered cutting fluid to the spray channel.

[0015] Preferably, a rotary joint is connected to the rear end of the rear chuck, the first spraying device is connected to the rotary joint, and the first spraying device is connected to the spraying channel through the rotary joint; a sealing plate is provided on the front side of the rear chuck, the spraying channel is located in the middle of the sealing plate, and the sealing plate is used to abut against the rear end face of the pipe to block the flow of cutting fluid.

[0016] Preferably, the laser cutting device includes a cutting head, the outer side of which is covered with a waterproof sleeve, and the lower end of the waterproof sleeve has an opening for the laser to pass through. The waterproof sleeve covering the cutting head serves to prevent cutting fluid from splashing onto the cutting head and causing damage during the cutting process, thereby improving its service life.

[0017] Preferably, the waterproof sleeve is provided with an air inlet, and an air passage gap is provided between the waterproof sleeve and the cutting head. The air passage gap is connected to the opening and the air inlet. The air inlet is used to fill in high-pressure gas and eject it from the opening through the air passage gap.

[0018] During processing, high-pressure gas can be continuously introduced into the waterproof sleeve through the air inlet. The high-pressure gas passes through the air gap and is ejected from the opening. The high-pressure gas forms an air wall under the cutting head to prevent liquid from entering the waterproof sleeve and to blow out any liquid that has entered the waterproof sleeve, thus improving the waterproof effect.

[0019] Preferably, the cutting head includes a mounting nut located on the upper side of the lower nozzle of the cutting head, the air inlet is located on the upper side of the mounting nut, the portion of the waterproof sleeve located on the upper side of the air inlet is fitted with the portion of the cutting head located on the upper side of the mounting nut, the outer circumferential surface of the mounting nut is provided with a horizontal groove or a diagonal mesh groove, the outer side of the horizontal groove or the diagonal mesh groove is provided close to the inner side of the waterproof sleeve, the outer circumferential surface of the mounting nut is also provided with a vertical plane, and the air passage gap includes the gap between the vertical plane and the inner side of the waterproof sleeve.

[0020] The outer circumference of the mounting nut is modified into a horizontal groove or a diagonal mesh groove, and the outer side of the horizontal groove or diagonal mesh groove is set close to the inner side of the waterproof sleeve, which can increase the difficulty of liquid seeping upward; the vertical plane on the outer circumference of the mounting nut can be used for both nut assembly and disassembly, and also allows high-pressure gas to be ejected downward through the outside of the vertical plane, which can maintain or increase the ejection pressure of high-pressure gas. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the laser cutting machine of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the laser cutting device, front chuck, rear chuck, first liquid spraying device, second liquid spraying device and liquid receiving tank of the laser cutting machine of this utility model.

[0024] Figure 3 This is a schematic diagram of the front side of the rear chuck of the laser cutting machine of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the laser cutting machine of this utility model when the rear chuck clamps the pipe.

[0026] Figure 5 This is a partial structural diagram of one embodiment of the present invention, showing the front chuck, the cutting head, and the second spraying device, with the second nozzle positioned away from the pipe.

[0027] Figure 6 This is a partial structural diagram of a front chuck, a cutting head, and a second liquid spraying device, with the second nozzle positioned close to the pipe when spraying cutting fluid, according to one embodiment of the present invention.

[0028] Figure 7 This is a partial structural diagram of another embodiment of the present invention, showing the front chuck, the cutting head, and the second spraying device, with the second nozzle positioned away from the pipe.

[0029] Figure 8 This is a partial structural diagram of the front chuck, cutting head, and second liquid spraying device in another embodiment of the present invention, with the second nozzle positioned close to the pipe when spraying cutting fluid.

[0030] Figure 9 This is a schematic diagram of the liquid receiving tank of this utility model;

[0031] Figure 10 This is an exploded view of the cutting head and waterproof sleeve of this utility model;

[0032] Figure 11 This is a cross-sectional view of the cutting head and waterproof sleeve of this utility model.

[0033] In the attached diagram: 1-Frame, 2-Laser cutting device, 21-Cutting head, 211-Lower nozzle, 22-Waterproof sleeve, 221-Air inlet, 222-Mounting screw hole, 23-Air passage gap, 24-Mounting nut, 241-Horizontal groove, 242-Vertical plane, 3-Front chuck, 4-Rear chuck, 41-Spray channel, 42-Rotary joint, 43-Blocking plate, 44-Claw, 51-First liquid supply pump, 52-First liquid supply pipe, 6-Second spray device, 61-Second spray moving mechanism, 62-Second nozzle, 7-Receiving tank, 71-Upper receiving tank, 72-Drain hole, 73-Lower filter tank, 74-Filter plate, 8-Pipe.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] like Figures 1 to 11As shown, a slag-removing laser cutting machine includes a frame 1. A laser cutting device 2, a front chuck 3, and a rear chuck 4 are mounted on the frame 1. Both the laser cutting device 2 and the front chuck 3 are located in front of the rear chuck 4, and the rear chuck 4 can move relative to the front chuck 3 in a front-rear direction. The rear chuck 4 clamps the rear end of a pipe 8, and the front chuck 3 clamps the front end of the pipe 8. The laser cutting device 2 can cut the pipe 8 from either the front or rear side of the front chuck 3. During the cutting process, the rear chuck 4 can clamp the rear end of the pipe 8 and push the pipe 8 forward.

[0039] The laser cutting machine also includes a first liquid spraying device, with a liquid spraying channel 41 located inside the rear chuck 4 directly opposite the rear end of the pipe 8, as shown in the reference. Figure 3 and Figure 4 The spray channel 41 is located in the hollow space inside the rear chuck 4. The first spray device is connected to the spray channel 41 and can spray cutting fluid into the pipe 8 through the spray channel 41.

[0040] The rear chuck 4 is equipped with a liquid spraying channel 41. When the rear chuck 4 clamps the rear end of the tube 8, the first liquid spraying device can spray cutting fluid into the rear end of the tube 8 through the liquid spraying channel 41. During laser cutting, the cutting fluid flows from inside the tube 8 to the processing area on the front side. Because there is cutting fluid inside the processing area of ​​the tube 8, the cutting fluid can reduce slag adhesion to the inner wall of the tube 8 and reduce dust generation. Furthermore, the flow of cutting fluid can wash out the slag inside the tube 8, thereby improving the cleanliness of the tube during cutting and reducing secondary processing costs.

[0041] In some specific embodiments, the laser cutting machine further includes a second liquid spraying device 6, which is located on the front side of the laser cutting device 2 and can spray cutting fluid into the front end of the pipe 8.

[0042] When a new pipe 8 is loaded, due to its relatively long length, the cutting fluid takes a long time to flow from the rear end to the front end, requiring a waiting period before processing and reducing processing efficiency. Therefore, this solution includes a second spraying device 6. Before cutting begins with a new pipe 8, refer to... Figure 6 and Figure 8 The second spraying device 6 first sprays cutting fluid into the front end of the pipe 8, so that the processing part is covered with cutting fluid more quickly. This allows cutting to start quickly, reducing the waiting time required for the cutting fluid to reach the front end from the rear end of the pipe 8 due to its long length, thus improving processing efficiency. In addition, it also avoids the risk of leakage caused by setting the pressure of the first spraying device too high in order to reduce waiting time.

[0043] Furthermore, the second liquid spraying device 6 includes a second liquid spraying moving mechanism 61 and a second nozzle 62. The second nozzle 62 is throttle-connected to the second liquid spraying moving mechanism 61 and faces rearward. The second liquid spraying moving mechanism 61 can drive the second nozzle 62 to move closer to or away from the clamping centerline of the front chuck 3, which is the axis of the pipe 8. The second liquid spraying device 6 also includes a second liquid supply pump, which is connected to the second nozzle 62 through a second liquid supply pipe. The second liquid supply pump supplies cutting fluid to the second nozzle 62.

[0044] When cutting fluid needs to be sprayed, the second spraying moving mechanism 61 moves the second nozzle 62 closer to the clamping centerline of the front chuck 3, that is, closer to the front of the pipe 8, as shown in the reference. Figure 6 and Figure 8 The second nozzle 62 sprays cutting fluid more precisely into the front end of the pipe 8; during machining, the second spraying moving mechanism 61 moves the second nozzle 62 away from the clamping centerline of the front chuck 3, that is, away from the front of the pipe 8, as shown in the reference. Figure 5 and Figure 7 This is to avoid obstructing the forward transport of pipe 8. After the cutting fluid is sprayed once at the front end of the new pipe 8, the second spraying device 6 may stop spraying cutting fluid because there is cutting fluid in the subsequent parts, or it may choose to spray cutting fluid according to the actual situation. The second spraying moving mechanism 61 may be a cylinder.

[0045] Furthermore, referring to Figure 5 and Figure 6 The laser cutting device 2 includes a cutting moving device and a cutting head 21. The cutting head 21, the second liquid spraying moving mechanism 61, and the second nozzle 62 are all mounted on the moving end of the cutting moving device. Specifically, the cutting moving device may include a left-right moving device and a right-up-down moving device. The left-right moving device is mounted on the frame 1, and the right-up-down moving device is mounted on the moving end of the left-right moving device. The cutting head 21, the second liquid spraying moving mechanism 61, and the second nozzle 62 are mounted on the moving end of the right-up-down moving device. The cutting moving device can drive the cutting head 21, the second liquid spraying moving mechanism 61, and the second nozzle 62 to move. The second liquid spraying moving mechanism 61 and the second nozzle 62 have more installation space mounted on the cutting moving device, and the second liquid spraying moving mechanism 61 and the second nozzle 62 can be moved to different positions through the cutting moving device to adapt to the position of spraying cutting fluid on different pipe materials 8, making the adjustment more flexible. In some other embodiments, the second liquid spraying device 6 can also be mounted on the frame 1, see reference. Figure 7 and Figure 8 It does not move synchronously with the cutting head 21.

[0046] In some specific embodiments, reference is made to Figure 2 and Figure 9The laser cutting machine also includes a liquid receiving tank 7, which is located below the laser cutting device 2. The liquid receiving tank 7 can receive the cutting fluid flowing out from the front side of the pipe 8. The first liquid spraying device includes a first liquid supply pump 51, which is connected to the liquid receiving tank 7. A first liquid supply pipe 52 is connected between the first liquid supply pump 51 and the liquid spraying channel 41. The first liquid supply pump 51 can supply the cutting fluid in the liquid receiving tank 7 to the liquid spraying channel 41.

[0047] After the cutting fluid flows out from the front end of the pipe 8, it falls into the receiving tank 7 for collection. The first supply pump 51 then supplies the cutting fluid in the receiving tank 7 to the spray channel 41 to spray the cutting fluid onto the front end of the pipe 8, thus forming a recycling of the cutting fluid and reducing the amount used.

[0048] Furthermore, referring to Figure 9 The liquid receiving tank 7 is provided with an upper liquid receiving tank 71 located on the upper layer and a lower filter tank 73 located on the lower layer. A drain hole 72 is provided on one side of the upper liquid receiving tank 71. A first liquid supply pump 51 is located in the lower filter tank 73. The first liquid supply pump 51 is located on the side away from the drain hole 72. A filter plate 74 for filtering impurities in the cutting fluid is provided in the lower filter tank 73.

[0049] The cutting fluid flowing from the front end of pipe 8 first falls into the upper receiving tank 71, and then flows through the drain hole 72 to the lower filter tank 73. In the lower filter tank 73, the cutting fluid is filtered by filter plates 74 to remove impurities such as slag and dust. Then, the first supply pump 51 supplies the filtered cutting fluid to the spray channel 41 to prevent impurities in the cutting fluid from damaging the equipment or remaining on pipe 8. There can be more than one filter plate 74, and each filter plate 74 has multiple filter holes.

[0050] In some specific embodiments, a rotary joint 42 is connected to the rear end of the rear chuck 4. The first liquid spraying device is connected to the rotary joint 42, and the first liquid spraying device is connected to the liquid spraying channel 41 through the rotary joint 42. That is, the first liquid supply pipe 52 is connected to the rotary joint 42, so as to prevent the rear chuck 4 from twisting the first liquid supply pipe 52 too much during rotation and causing damage.

[0051] A sealing plate 43 is provided on the front side of the rear chuck 4, as shown in the figure. Figure 3 and Figure 4The sealing plate 43 is located in the middle of the clamp 44, and the liquid spraying channel 41 is located in the middle of the sealing plate 43. The sealing plate 43 is used to abut against the rear end face of the pipe 8 to block the flow of cutting fluid. When a new pipe 8 is loaded, the rear chuck 4 approaches the rear end of the pipe 8 and the sealing plate 43 abuts against the rear end of the pipe 8. Then the clamp 44 clamps the pipe 8. In this way, when the liquid spraying channel 41 sprays cutting fluid into the pipe 8, the cutting fluid will not flow back out from the rear end of the pipe 8. Preferably, the front end of the sealing plate 43 is made of soft rubber, which can better fit against the rear end face of the pipe 8 and improve the waterproof effect.

[0052] In some specific embodiments, reference is made to Figure 10 and Figure 11 The laser cutting device 2 includes a cutting head 21, which is covered by a waterproof sleeve 22. The lower end of the waterproof sleeve 22 has an opening for the laser to pass through. The waterproof sleeve 22 covers the cutting head 21 to prevent cutting fluid from splashing onto the cutting head 21 and causing damage, thus improving its service life.

[0053] Furthermore, the waterproof sleeve 22 is provided with an air inlet 221, which can be connected to an air pipe connector and an air pipe. An air passage gap 23 is provided between the waterproof sleeve 22 and the cutting head 21. The air passage gap 23 is connected to the opening and the air inlet 221. The air inlet 221 is used to fill in high-pressure gas and spray it out from the opening through the air passage gap 23.

[0054] During processing, high-pressure gas can be continuously introduced into the waterproof sleeve 22 through the air inlet 221. The high-pressure gas passes through the air gap 23 and is ejected from the opening. The high-pressure gas forms an air wall on the lower side of the cutting head 21 to prevent liquid from entering the waterproof sleeve 22 and to blow out the liquid that has entered the waterproof sleeve 22, thereby improving the waterproof effect.

[0055] Furthermore, the cutting head 21 includes a mounting nut 24 located above the lower nozzle 211 of the cutting head 21, an air inlet 221 located above the mounting nut 24, and the portion of the waterproof sleeve 22 located above the air inlet 221 fitting snugly against the portion of the cutting head 21 located above the mounting nut 24, allowing high-pressure gas to flow downwards. The outer circumferential surface of the mounting nut 24 is provided with a horizontal groove 241 or a diagonal mesh groove, with the outer side of the horizontal groove 241 or the diagonal mesh groove located close to the inner side of the waterproof sleeve 22. Preferably, there is a small gap between the outer side of the horizontal groove 241 or the diagonal mesh groove and the inner side of the waterproof sleeve 22, which facilitates installation and allows a small amount of high-pressure gas to be blown in. The outer circumferential surface of the mounting nut 24 is also provided with a vertical plane 242, and the air passage gap 23 includes the gap between the vertical plane 242 and the inner side of the waterproof sleeve 22.

[0056] The mounting nut 24 is used to install the lower nozzle 211 in the cutting head 21. Existing mounting nuts 24 have vertical grooves, which allow water to easily seep upwards. This design modifies the outer circumferential surface of the mounting nut 24 into a horizontal groove 241 or a slanted mesh groove, with the outer side of the horizontal groove 241 or slanted mesh groove positioned close to the inner side of the waterproof sleeve 22, increasing the difficulty of liquid seepage upwards. The vertical plane 242 on the outer circumferential surface of the mounting nut 24 can be used for both nut installation and removal, and also allows high-pressure gas to be ejected downwards primarily through the vertical plane 242, maintaining or increasing the ejection pressure of the high-pressure gas.

[0057] Furthermore, the waterproof sleeve 22 is provided with multiple mounting screw holes 222, which are directly opposite the mounting nut 24. A set screw is inserted into the mounting screw hole 222, and the set screw can press against the outer periphery of the mounting nut 24, thereby fixing the waterproof sleeve 22 onto the cutting head 21.

[0058] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A slag-removing laser cutting machine, characterized in that, The machine includes a frame (1), on which a laser cutting device (2), a front chuck (3) and a rear chuck (4) are provided. The laser cutting device (2) and the front chuck (3) are both located on the front side of the rear chuck (4). The rear chuck (4) can move relative to the front chuck (3) in the front-back direction. The laser cutting machine also includes a first liquid spraying device. The rear chuck (4) has a liquid spraying channel (41) facing the rear end of the pipe (8). The first liquid spraying device is connected to the liquid spraying channel (41). The first liquid spraying device can spray cutting fluid into the pipe (8) through the liquid spraying channel (41).

2. The laser cutting machine as described in claim 1, characterized in that, The laser cutting machine also includes a second liquid spraying device (6), which is located on the front side of the laser cutting device (2) and can spray cutting fluid into the front end of the pipe (8).

3. The laser cutting machine as described in claim 2, characterized in that, The second spraying device (6) includes a second spraying moving mechanism (61) and a second nozzle (62). The second nozzle (62) is connected to the second spraying moving mechanism (61) in a transmission manner. The second nozzle (62) faces the rear side. The second spraying moving mechanism (61) can drive the second nozzle (62) to approach or move away from the clamping centerline of the front chuck (3).

4. The laser cutting machine as described in claim 3, characterized in that, The laser cutting device (2) includes a cutting moving device and a cutting head (21). The cutting head (21), the second liquid spraying moving mechanism (61) and the second nozzle (62) are all located on the moving end of the cutting moving device.

5. The laser cutting machine as described in claim 1, characterized in that, The laser cutting machine also includes a liquid receiving tank (7), which is located below the laser cutting device (2). The liquid receiving tank (7) can receive cutting fluid flowing out from the front side of the pipe (8). The first spraying device includes a first liquid supply pump (51), which is connected to the liquid receiving tank (7). A first liquid supply pipe (52) is connected between the first liquid supply pump (51) and the spraying channel (41). The first liquid supply pump (51) can supply the cutting fluid in the liquid receiving tank (7) to the spraying channel (41).

6. The laser cutting machine as described in claim 5, characterized in that, The liquid receiving tank (7) is provided with an upper liquid receiving tank (71) on the upper layer and a lower filter tank (73) on the lower layer. A drain hole (72) is provided on one side of the upper liquid receiving tank (71). The first liquid supply pump (51) is located in the lower filter tank (73) and is located on the side away from the drain hole (72). A filter plate (74) for filtering impurities in the cutting fluid is provided in the lower filter tank (73).

7. The laser cutting machine as described in claim 1, characterized in that, The rear end of the rear chuck (4) is connected to a rotary joint (42), the first spraying device is connected to the rotary joint (42), and the first spraying device is connected to the spraying channel (41) through the rotary joint (42). A sealing plate (43) is provided on the front side of the rear chuck (4), and the liquid spraying channel (41) is located in the middle of the sealing plate (43). The sealing plate (43) is used to abut against the rear end face of the pipe (8) to block the flow of cutting fluid.

8. The laser cutting machine as described in claim 1, characterized in that, The laser cutting device (2) includes a cutting head (21), the outer side of which is covered with a waterproof sleeve (22), and the lower end of the waterproof sleeve (22) is provided with an opening for the laser to pass through.

9. The laser cutting machine as described in claim 8, characterized in that, The waterproof sleeve (22) is provided with an air inlet (221), and an air passage gap (23) is provided between the waterproof sleeve (22) and the cutting head (21). The air passage gap (23) is connected to the opening and the air inlet (221). The air inlet (221) is used to fill in high-pressure gas and spray it out from the opening through the air passage gap (23).

10. The laser cutting machine as described in claim 9, characterized in that, The cutting head (21) includes a mounting nut (24) located on the upper side of the lower nozzle (211) of the cutting head (21). The air inlet (221) is located on the upper side of the mounting nut (24). The part of the waterproof sleeve (22) located on the upper side of the air inlet (221) is fitted with the part of the cutting head (21) located on the upper side of the mounting nut (24). The outer peripheral surface of the mounting nut (24) is provided with a horizontal groove (241) or a diagonal mesh groove. The outer side of the horizontal groove (241) or the diagonal mesh groove is provided close to the inner side of the waterproof sleeve (22). The outer peripheral surface of the mounting nut (24) is also provided with a vertical plane (242). The air passage gap (23) includes the gap between the vertical plane (242) and the inner side of the waterproof sleeve (22).

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