Laser pipe cutting machine with cooling system

Abstract

The invention discloses a laser pipe cutting machine with a cooling system, which is characterized in that the outer side of a laser cutting head is sleeved with a heat dissipation suite, an inner water cavity and an outer water cavity which are communicated with each other are arranged in the heat dissipation suite, cold air pipelines are arranged in the two water cavities, and the bottom of the heat dissipation suite is connected with an air blowing box; the bottom of the air blowing box is connected with a lantern ring arranged on the lower portion of the laser cutting head in a sleeving mode, and a cold water cavity is formed in the lantern ring. A fixed seat is mounted on the outer side wall of the front chuck, and a water bag for cooling the pipe is arranged on the inner ring of the fixed seat; cold air downwards blows away hot air generated by cutting after cooling the water body, and heat interference is reduced; the outer water cavity accurately controls the water flow direction through the inflation amount of the air bag, closed circulation of extrusion-cooling-backflow-mixing is formed, and therefore the cutting head is always kept in the low-temperature working state, the service life of equipment is prolonged, and the cutting stability is improved. The problems of notch hardening and oxidation of stainless steel, aluminum alloy and other metal pipes are effectively reduced, a heat affected zone is reduced, and the notch quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser pipe cutting machines, and specifically provides a laser pipe cutting machine with a cooling system. Background Art

[0002] A laser pipe cutting machine is a high-precision pipe cutting device based on laser processing technology, mainly used for the automated cutting of metal or non-metal pipes. Its core principle is to focus a high-power laser beam into an extremely small spot (diameter ≤ 0.2 mm), locally heat the pipe to the vaporization or melting state, and at the same time cooperate with auxiliary gases (such as oxygen, nitrogen) to blow away the molten slag to achieve rapid cutting of the pipe. This device can process various cross-sectional shapes such as round pipes, square pipes, rectangular pipes, and special-shaped pipes, and is widely used in fields such as mechanical manufacturing, aerospace, automobiles, medical devices, and architectural decoration.

[0003] Existing equipment faces the following problems during the pipe cutting process: A large amount of heat is generated when the laser cutting head operates at high power. If the heat dissipation is not timely, it is easy to cause the aging of internal components of the cutting head, a decrease in accuracy, and even equipment failures; the high temperature generated during the cutting process will cause problems such as material hardening, oxidation, or deformation near the pipe cut, forming a large heat-affected zone, which affects the cutting quality of the pipe and its subsequent processing performance; in addition, the upward heat airflow generated during cutting will carry heat and act on the cutting head, further exacerbating the temperature rise of the cutting head.

[0004] Chinese Patent CN115476057A discloses a cooling laser cutting head, including a cutting head body, and a water-cooling sleeve is sleeved outside the cutting head body: The water-cooling sleeve includes a water-cooling inner sleeve and a water-cooling outer sleeve, and both are annular hollow structures, and the upper ends of both are connected by an annular water channel. The water-cooling inner sleeve is embedded in an annular groove. An inlet pipe is arranged at the upper end of the water-cooling sleeve, and an outlet pipe is arranged at its lower end. The inlet pipe is externally connected to a cooling water source, and a spiral-shaped outer channel is opened outside the water-cooling outer sleeve. This invention can perform water cooling and air cooling on the laser cutting head by setting the water-cooling sleeve and the air-cooling sleeve, and the two can complement each other, thereby improving the cooling efficiency, ensuring the constancy of the temperature of the laser cutting head during operation, and achieving an improvement in cutting quality. However, in this application, the water-cooling path is fixed, the circulation efficiency and heat exchange capacity are insufficient, the coordination between air cooling and water cooling is insufficient, it is not linked with the water-cooling system, the cold quantity utilization rate is low, and the cooling system has a single function and lacks coordinated cooling of the pipe. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the above background art, and provide a laser pipe cutting machine with a cooling system to solve the cooling problems of the laser cutting head and the pipe.

[0006] The present invention achieves the above object through the following technical solutions: A laser pipe cutting machine with a cooling system, comprising a workbench and a front chuck and a rear chuck respectively arranged at the front and rear ends of the workbench. A moving cutting assembly is provided on the upper side of the front chuck. The moving cutting assembly includes a laser cutting head. A heat dissipation kit is sleeved outside the laser cutting head. An inner water cavity and an outer water cavity that communicate with each other are provided in the heat dissipation kit. Cold air pipes for reducing the water temperature are provided in both water cavities. A blowing box is connected to the bottom of the heat dissipation kit. After the cold air cools the water in the two water cavities, it flows into the blowing box and then blows down the hot air flow generated by cutting. A collar sleeving the lower part of the laser cutting head is connected to the bottom of the blowing box. A cold water cavity is opened in the collar. A fixing seat is installed on the outer side wall of the front chuck. A water bag for cooling the pipe is arranged inside the fixing seat. An air bag is installed in the outer water cavity. The outer water cavity is connected to the cold water cavity and the water bag respectively through pipelines.

[0007] When the air bag is filled with gas in a circulating interval equal to 1 / 3 and 2 / 3 of the capacity of the outer water cavity, the cooling water in the outer water cavity will circulate in the outer water cavity, the cold water cavity and the water bag.

[0008] Further, the heat dissipation kit is provided with a heat conduction ring close to the outer side of the laser cutting head from the inside to the outside. A partition for separating the inner water cavity and the outer water cavity is provided on one side of the heat conduction ring. A through hole for communicating the inner water cavity and the outer water cavity is opened at the top of the partition. One side of the partition is the outer ring wall of the heat dissipation kit.

[0009] Further, the capacity of the outer water cavity is greater than that of the inner water cavity. The capacities of the cold water cavity and the water bag are both 1 / 3 of the capacity of the outer water cavity.

[0010] Further, the water bag includes an inner layer of metal foil and an outer layer of silicone rubber. The metal foil and the silicone rubber are pressed together through an adhesive to form a metal foil rubber sandwich structure.

[0011] Further, a spiral first cold air pipe is provided on the outer side of the heat conduction ring. A spiral second cold air pipe is provided on the outer side of the partition. The intake ends of the first cold air pipe and the second cold air pipe penetrate and extend out of the top of the heat dissipation kit, while the tail ends penetrate the bottom of the heat dissipation kit and extend into the blowing box.

[0012] Further, the air bag is two arc-shaped sub-air bags symmetrically installed on the inner bottom surface of the outer water cavity. Two-way air pumps respectively connected to the two sub-air bags are symmetrically installed at the bottom of the heat dissipation kit.

[0013] Further, the outer water chamber and the cold water chamber are respectively connected by a first pipeline and a second pipeline. A first one-way valve is provided at the inner bottom of the outer water chamber, and one end of the first pipeline is connected to the first one-way valve; a first water pump for conveying the water in the cold water chamber back to the outer water chamber is installed on the second pipeline.

[0014] Further, the outer water chamber and the water bag are respectively connected by a third pipeline and a fourth pipeline. A second one-way valve is provided at the inner bottom of the outer water chamber, and one end of the third pipeline is connected to the second one-way valve; a second water pump for conveying the water in the water bag back to the outer water chamber is installed on the fourth pipeline.

[0015] Further, a plurality of air blowing holes are circumferentially formed at the bottom edge side of the air blowing box.

[0016] Further, a through channel is formed in the fixing base, and the water bag is installed in the through channel. After being filled with water, the water bag closely adheres to the outer surface of the pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The inner water chamber is close to the cutting head and directly absorbs the core heat; the outer water chamber further stores heat through a larger volume of water body, and cooperates with the spiral first cold air pipe and second cold air pipe to introduce cold air, double-lowering the water temperature, so that the cutting head always maintains a low-temperature working state, prolonging the service life of the equipment and improving the cutting stability. After the cold air cools the water body, it flows into the air blowing box, and blows down the hot air flow generated by cutting through the air blowing holes at the bottom edge, forming a three-dimensional heat dissipation network of "water cooling + air cooling", avoiding the backflow of the hot air flow to the cutting head and reducing the heat interference.

[0019] 2. A water bag is arranged in the fixing base outside the front chuck. It adopts a metal foil (copper / aluminum foil) and silicone rubber sandwich structure. The inner layer of metal foil has high heat conduction efficiency, and the outer layer of silicone rubber has good elasticity and high temperature resistance. After being filled with water, the water bag closely adheres to the outer surface of the pipe, pre-cools the part to be cut before cutting, and absorbs heat in real time during the cutting process, effectively reducing the problems of incision hardening and oxidation of metal pipes such as stainless steel and aluminum alloy, narrowing the heat affected zone, and improving the incision quality. Cooperating with the forward and backward movement of the pipe, the water bag can dynamically wrap the cutting part to achieve "mobile cooling", avoiding local overheating caused by continuous cutting, and is especially suitable for continuous processing of long pipes.

[0020] 3. The external water chamber precisely controls the water flow direction through the inflation volume of the airbag (1 / 3 - 2 / 3 of the capacity): When the airbag is inflated, the water pressure pushes the cooling water in the external water chamber to flow into the cold water chamber and the water bladder in sequence; when the airbag is deflated, the heated water is returned to the external water chamber through the first water pump and the second water pump, and is mixed with the water in the internal water chamber through the through-port. The rapid expansion / contraction of the sub-airbag is used for stirring and cooling, forming a "squeezing - cooling - reflux - mixing" closed cycle. This design does not require a complex pumping system, and only realizes the automatic switching of water flow through the change of the airbag volume and the one-way valve, with low energy consumption and high cycle efficiency. At the same time, it avoids the blockage or reflux problems that may occur in traditional water pumps. Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a schematic diagram of the heat dissipation kit and the water bladder in the present invention;

[0023] Figure 3 is a schematic diagram of the heat dissipation kit and the water bladder in the present invention;

[0024] Figure 4 is a top view of the heat dissipation kit in the present invention;

[0025] Figure 5 is Figure 4 a cross-sectional view taken along A - A in

[0026] Figure 6 is Figure 4 a cross-sectional view taken along B - B in

[0027] Figure 7 is a schematic diagram of the interior of the heat dissipation kit in the present invention;

[0028] Figure 8 is a schematic diagram of the bottom of the air - blowing box in the present invention.

[0029] In the figures: 1 - workbench, 2 - laser cutting head, 3 - heat dissipation kit, 4 - internal water chamber, 5 - external water chamber, 6 - air - blowing box, 7 - collar, 8 - fixing seat, 9 - water bladder, 10 - airbag, 11 - first cold air pipe, 12 - second cold air pipe, 13 - first pipeline, 14 - second pipeline, 15 - first one - way valve, 16 - first water pump, 17 - third pipeline, 18 - fourth pipeline, 19 - second one - way valve, 20 - second water pump, 31 - heat - conducting ring, 32 - partition board, 71 - cold water chamber, 101 - sub - airbag, 102 - two - way air pump, 321 - through - port. Detailed Embodiments

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] Combined with Figures 1 to 8 As shown, a laser pipe cutting machine with a cooling system includes a workbench 1, a front chuck and a rear chuck respectively arranged at the front and rear ends of the workbench 1. A moving cutting assembly is provided on the upper side of the front chuck. The moving cutting assembly includes a laser cutting head 2. A heat dissipation kit 3 is sleeved outside the laser cutting head 2. An inner water cavity 4 and an outer water cavity 5 communicating with each other are provided in the heat dissipation kit 3. Cold air pipes for reducing the water temperature are provided in both water cavities. A blowing box 6 is connected to the bottom of the heat dissipation kit 3. After the cold air cools the water in the two water cavities, it flows into the blowing box 6 and then blows down the hot air flow generated by cutting. A collar 7 sleeving the lower part of the laser cutting head 2 is connected to the bottom of the blowing box 6. A cold water cavity 71 is formed in the collar 7. A fixing seat 8 is installed on the outer side wall of the front chuck. A water bag 9 for cooling the pipe is arranged inside the inner ring of the fixing seat 8. An air bag 10 is installed in the outer water cavity 5. The outer water cavity 5 is connected to the cold water cavity 71 and the water bag 9 through pipelines respectively. When the air volume equal to 1 / 3 and 2 / 3 of the capacity of the outer water cavity 5 is cyclically and intermittently filled into the air bag 10, the cooling water in the outer water cavity 5 will circulate in the outer water cavity 5, the cold water cavity 71 and the water bag 9.

[0033] As Figures 5 - 7As shown in the figure, the heat dissipation kit 3 is provided with a heat conduction ring 31 close to the outer side of the laser cutting head 2 from the inside to the outside. One side of the heat conduction ring 31 is provided with a partition plate 32 for separating the inner water cavity 4 and the outer water cavity 5. A through hole 321 for communicating the inner water cavity 4 and the outer water cavity 5 is opened at the top of the partition plate 32. One side of the partition plate 32 is the outer ring wall of the heat dissipation kit 3; a spiral first cold air pipe 11 is arranged on the outer side of the heat conduction ring 31, and a spiral second cold air pipe 12 is arranged on the outer side of the partition plate 32. The air inlet ends of the first cold air pipe 11 and the second cold air pipe 12 penetrate and extend out of the top of the heat dissipation kit 3, and the tail ends penetrate the bottom of the heat dissipation kit 3 and extend into the air blowing box 6. A plurality of air blowing holes are formed in a circumferential manner on the bottom surface edge side of the air blowing box 6;

[0034] During use, an external air conditioner is connected to the first cold air pipe 11 and the second cold air pipe 12, and cold air is transported accordingly. During the transportation of the cold air, the cold air in the first cold air pipe 11 cools the water in the inner water cavity 4, and the pipe wall of the first cold air pipe 11 close to the heat conduction ring 31 plus the cooling water in the inner water cavity 4 can enhance the cooling effect on the laser cutting head 2; while the cold air in the second cold air pipe 12 cools the water in the outer water cavity 5. Subsequently, the cold air in the first cold air pipe 11 and the second cold air pipe 12 flows into the air blowing box 6, and then the cold air blows downward from a plurality of air blowing holes formed in a circumferential manner on the bottom surface edge side of the air blowing box 6 to disperse the upward heat flow generated by cutting, reducing the heat influence of the upward heat flow on the cutting head, so that the laser cutting head 2 does not rely solely on the cooling water to achieve the purpose of temperature reduction.

[0035] As Figures 2 - 7 shown in the figure, the airbag 10 is two arc-shaped sub-airbags 101 symmetrically installed on the inner bottom surface of the outer water cavity 5. The bottom of the heat dissipation kit 3 is symmetrically installed with a two-way air pump 102 respectively connected to the two sub-airbags 101; the outer water cavity 5 is respectively connected to the cold water cavity 71 by a first pipeline 13 and a second pipeline 14. A first one-way valve 15 is provided at the inner bottom of the outer water cavity 5. One end of the first pipeline 13 is connected to the first one-way valve 15; a first water pump 16 for transporting the water in the cold water cavity 71 back into the outer water cavity 5 is installed on the second pipeline 14; the outer water cavity 5 is respectively connected to the water bag 9 by a third pipeline 17 and a fourth pipeline 18. A second one-way valve 19 is provided at the inner bottom of the outer water cavity 5. One end of the third pipeline 17 is connected to the second one-way valve 19; a second water pump 20 for transporting the water in the water bag 9 back into the outer water cavity 5 is installed on the fourth pipeline 18;

[0036] In addition, the capacity of the outer water cavity 5 is greater than that of the inner water cavity 4, and the capacities of the cold water cavity 71 and the water bag 9 are both 1 / 3 of the capacity of the outer water cavity 5; when the cooling water flows in a cycle among the outer water cavity 5, the cold water cavity 71 and the water bag 9:

[0037] S1: Initially (when the airbag 10 is in the initial contracted state), the water chamber of the entire heat dissipation kit 3 is filled with water. Under the cold air delivery of the first cold air pipe 11 and the second cold air pipe 12, the water temperature in the entire chamber drops. Subsequently, the airbag 10 is inflated, and the gas volume is 1 / 3 of the volume of the outer water chamber 5. Under the water pressure and the opening of the first one-way valve 15, 1 / 3 of the water volume in the outer water chamber 5 enters the cold water chamber 71 with a volume of 1 / 3 of the volume of the outer water chamber 5 through the first one-way valve 15 and the first pipeline 13. Thus, the cooling water in the cold water chamber 71 cools the lower part of the laser cutting head 2; Subsequently, the next operation can be controlled by measuring with a water level gauge or setting the time required to inflate and squeeze the water volume.

[0038] S2: Next, the airbag 10 is inflated again, and the gas volume reaches 2 / 3 of the volume of the outer water chamber 5. Under the water pressure and the opening of the second one-way valve 19, another 1 / 3 of the water volume in the outer water chamber 5 enters the water bag 9 with a volume of 1 / 3 of the volume of the outer water chamber 5 through the second one-way valve 19 and the third pipeline 17. Thus, the water bag 9 conducts the low temperature to the surface of the pipe being cut through heat conduction. To prevent the water in the water bag 9 from flowing back into the outer water chamber 5 when the water bag 9 is squeezed by the pipe, a one-way valve can be installed at the connection between the third pipeline 17 and the water bag 9.

[0039] S3: Next, due to the contact heat conduction between the cold water chamber 71 and the lower part of the laser cutting head 2, while the laser cutting head 2 cools down, the water temperature in it rises. Then, the first water pump 16 is started, and the water in the cold water chamber 71 is transported back to the outer water chamber 5 through the first water pump 16 and the second pipeline 14. At this time, the outer water chamber 5 has 2 / 3 of the water volume. Subsequently, the two double - acting air pumps 102 respectively inflate and suck air quickly into and out of the two sub - airbags 101, and the gas volume is 1 / 3 of the volume of the outer water chamber 5. Since there is a through - hole 321 at the top of the partition 32 between the inner water chamber 4 and the outer water chamber 5, when the two sub - airbags 101 repeatedly expand and contract quickly, the water in the inner water chamber 4 and the outer water chamber 5 will be stirred and mixed, thereby quickly reducing the mixed water temperature in the overall chamber.

[0040] S4: Next, the airbag 10 starts to be inflated, and the gas volume reaches 2 / 3 of the volume of the outer water chamber 5, and the first one - way valve 15 is opened. The cooled water enters the cold water chamber 71 again. At this time, the remaining water volume in the outer water chamber 5 is 1 / 3 of the volume of the outer water chamber 5; Then, the second water pump 20 is started to pump the water in the water bag 9 back to the outer water chamber 5 through the fourth pipeline 18. At this time, the outer water chamber 5 has 2 / 3 of the water volume. Subsequently, the two double - acting air pumps 102 are used again to respectively inflate and suck air quickly into and out of the two sub - airbags 101, and the gas volume is 1 / 3 of the volume of the outer water chamber 5, so as to stir and mix the water in the inner water chamber 4 and the outer water chamber 5, and quickly reduce the water temperature in the overall chamber.

[0041] S5: Next, the airbag 10 starts to inflate until the air volume reaches 2 / 3 of the capacity of the outer water chamber 5, and the second one-way valve 19 opens. The cooled water enters the water bag 9 again to continue cooling the pipe.

[0042] In this way, the water in the outer water chamber 5 will flow back and forth into the cold water chamber 71 and the water bag 9 respectively under the expansion and extrusion of the airbag 10 and the cyclic and sequential opening of the first one-way valve 15 and the second one-way valve 19, and will be pumped back to the outer water chamber 5 through the first water pump 16 and the second water pump 20 respectively for mixed cooling, and then continue to be squeezed into the cold water chamber 71 (to cool the lower part of the laser cutting head) and the water bag (to cool the cut pipe).

[0043] During the whole process, although the laser cutting head 2 will move continuously (including moving up, down, left and right) when cutting the pipe, since the water will circulate back to the outer water chamber 5 and will be stirred and mixed, a certain amount of water will be maintained in the inner water chamber 4, so as to cool the laser cutting head 2 through the cooling water in the inner water chamber 4.

[0044] As Figures 1 - 2 shown, a through-channel is opened in the fixed seat 8, and a water bag 9 is installed in the through-channel. After being filled with water, the water bag 9 clings to the outer surface of the pipe; among them, the water bag 9 can be surrounded and installed in the through-channel of the fixed seat 8 by gluing; in addition, the sizes of the fixed seat 8 and the water bag 9 can be adjusted according to the shape and diameter of the cut pipe. When using the water bag 9 to cool the pipe being cut:

[0045] a: The previous section of the pipe (the part of the pipe to be cut) of the part of the pipe being laser cut will be wrapped by the water bag 9, so as to pre-cool the part to be cut and reduce the damage to the pipe caused by the high temperature generated during cutting.

[0046] b: During the processing of the pipe, the rear chuck is used to drive the pipe to move back and forth. In this way, when moving back and forth, the water bag 9 will briefly wrap the part of the pipe being cut, and the wrapped part (with high temperature) will be cooled. Thus, the temperature of the cutting part is reduced during the back-and-forth movement, so that laser cutting can continue, and the damage caused by the high temperature generated by continuous cutting is reduced. For example: for metal pipes such as stainless steel and aluminum alloy, high temperature may cause hardening or oxidation of the material near the cut, and cooling can reduce the damage of the heat affected zone (HAZ).

[0047] The water bag 9 includes an inner metal foil and an outer silicone rubber. The metal foil can be made of red copper foil or aluminum foil with a thickness of 0.1 - 0.3 mm, and the silicone rubber can be added with heat-conducting fillers such as aluminum nitride and silicon carbide. The metal foil and the silicone rubber are pressed together through an adhesive (such as a silane coupling agent) to form a metal foil-rubber sandwich structure. The metal side faces inward to contact the high-temperature area, and the rubber side faces outward to provide elasticity. The combination of the two takes into account both the heat conduction efficiency and the high-temperature resistance, making it suitable for most metal pipe cutting scenarios.

[0048] The above-mentioned air conditioner models are available for selection: the compression type air conditioner, Daikin FTXR series, which has efficient frequency conversion control, stable cold air output, and supports pipe connection.

[0049] The cooling water in the above-mentioned heat dissipation kit 3 is a general term, and it is actually a selectable coolant. The coolant that can be used includes deionized water, ethylene glycol aqueous solution, etc.

[0050] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0051] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A laser tube cutting machine with a cooling system, comprising a workbench (1) and a front chuck and a rear chuck respectively arranged at the front and rear ends of the workbench (1), wherein a moving cutting assembly is arranged on the upper side of the front chuck, and the moving cutting assembly includes a laser cutting head (2), and is characterized in that: A heat dissipation kit (3) is sleeved outside the laser cutting head (2). An inner water cavity (4) and an outer water cavity (5) which communicate with each other are arranged in the heat dissipation kit (3). Cold air pipes for reducing the water temperature are arranged in both water cavities. A blowing box (6) is connected to the bottom of the heat dissipation kit (3). After the cold air cools the water in the two water cavities, it flows into the blowing box (6), and then blows down the hot air flow generated by cutting. A collar (7) sleeving the lower part of the laser cutting head (2) is connected to the bottom of the blowing box (6). A cold water cavity (71) is formed inside the collar (7). A fixing seat (8) is installed on the outer side wall of the front chuck. A water bag (9) for cooling the pipe is arranged inside the inner ring of the fixing seat (8). An air bag (10) is installed in the outer water cavity (5). The outer water cavity (5) is connected to the cold water cavity (71) and the water bag (9) respectively through pipelines. When the air volume equal to 1 / 3 and 2 / 3 of the capacity of the outer water cavity (5) is alternately filled into the air bag (10) in a cycle, the cooling water in the outer water cavity (5) will circulate in the outer water cavity (5), the cold water cavity (71) and the water bag (9).

2. The laser pipe cutting machine with a cooling system according to claim 1, characterized in that: The heat dissipation kit (3) is respectively provided with a heat conduction ring (31) close to the outer side surface of the laser cutting head (2) from the inside to the outside. A partition plate (32) for separating the inner water cavity (4) and the outer water cavity (5) is arranged on one side of the heat conduction ring (31). A through hole (321) for communicating the inner water cavity (4) and the outer water cavity (5) is opened at the top of the partition plate (32). One side of the partition plate (32) is the outer ring wall of the heat dissipation kit (3).

3. The laser tube cutting machine with a cooling system according to claim 2, characterized in that: The capacity of the outer water cavity (5) is larger than that of the inner water cavity (4). The capacities of the cold water cavity (71) and the water bag (9) are both 1 / 3 of the capacity of the outer water cavity (5).

4. The laser pipe cutting machine with a cooling system according to claim 3, characterized in that: The water bag (9) includes an inner layer of metal foil and an outer layer of silicone rubber. The metal foil and the silicone rubber are press-fitted through an adhesive to form a metal foil rubber sandwich structure.

5. The laser tube cutting machine with a cooling system according to claim 4, characterized in that: A spiral first cold air pipe (11) is arranged on the outer side surface of the heat conduction ring (31). A spiral second cold air pipe (12) is arranged on the outer side surface of the partition plate (32). The air inlet ends of the first cold air pipe (11) and the second cold air pipe (12) penetrate through the top of the heat dissipation kit (3), and the tail ends penetrate through the bottom of the heat dissipation kit (3) and extend into the blowing box (6).

6. The laser tube cutting machine with a cooling system according to claim 5, characterized in that: The air bag (10) is composed of two arc-shaped sub-air bags (101) symmetrically installed on the inner bottom surface of the outer water cavity (5). A two-way air pump (102) respectively connected to the two sub-air bags (101) is symmetrically installed at the bottom of the heat dissipation kit (3).

7. The laser pipe cutting machine with a cooling system according to claim 6, characterized in that: The outer water chamber (5) and the cold water chamber (71) are respectively connected by a first pipeline (13) and a second pipeline (14). A first one-way valve (15) is provided at the inner bottom of the outer water chamber (5), and one end of the first pipeline (13) is connected to the first one-way valve (15); a first water pump (16) for conveying the water in the cold water chamber (71) back into the outer water chamber (5) is installed on the second pipeline (14).

8. The laser pipe cutting machine with a cooling system according to claim 7, characterized in that: The outer water chamber (5) and the water bag (9) are respectively connected by a third pipeline (17) and a fourth pipeline (18). A second one-way valve (19) is provided at the inner bottom of the outer water chamber (5), and one end of the third pipeline (17) is connected to the second one-way valve (19); a second water pump (20) for conveying the water in the water bag (9) back into the outer water chamber (5) is installed on the fourth pipeline (18).

9. The laser pipe cutting machine with a cooling system according to claim 8, wherein: A plurality of air blowing holes are circumferentially formed at the edge side of the bottom surface of the air blowing box (6).

10. The laser tube cutting machine with a cooling system according to claim 9, characterized in that: A through channel is formed in the fixing seat (8), and the water bag (9) is installed in the through channel. After being filled with water, the water bag (9) closely adheres to the outer surface of the pipe.

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