Method and device for laser cutting of sheet metal for gantry machine tool component manufacturing

Abstract

The present application relates to laser cutting technical field, particularly to metal plate laser cutting method and device for gantry machine tool component manufacturing. The metal plate laser cutting device for gantry machine tool component manufacturing comprises a machine tool, a laser cutting assembly and a protective cover. The laser cutting assembly comprises a main body and a nozzle arranged at the bottom of the main body. The protective cover is sleeved on the outer periphery of the nozzle. The inner wall of the protective cover and the outer wall of the nozzle are matched, and an annular cavity is formed between the protective cover and the nozzle. A plurality of air ducts are arranged on the nozzle and uniformly distributed in the circumferential direction. The air ducts gradually approach the inner side of the nozzle from the top end of the nozzle downward, and then communicate with the annular cavity radially outward after approaching the bottom end of the nozzle. The auxiliary gas in the air ducts blows radially into the annular cavity. The present application reduces the risk of slag adhering to the nozzle by arranging the protective cover and the auxiliary gas radially blowing from the bottom of the nozzle.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and in particular to a method and apparatus for laser cutting metal plates for manufacturing gantry milling machine parts. Background Technology

[0002] Gantry milling machine components must withstand high loads, vibrations, and thermal deformation. Therefore, the metal plates used in manufacturing these components must possess high strength, high rigidity, good wear resistance, and thermal stability. Laser cutting, a common method in metal cutting and welding equipment manufacturing, is employed when cutting such metal plates. However, during laser cutting, molten slag easily splashes and adheres to the nozzle surface. This leads to uneven thermal stress on the nozzle, altering its shape and affecting cutting efficiency. Furthermore, the wake generated during nozzle movement makes molten slag adhere more easily circumferentially, concentrating the temperature in the wake zone and further exacerbating the risk of nozzle deformation due to uneven thermal stress. Simultaneously, the nozzle also exhibits uneven temperature in the axial direction, with heat concentrated closer to the bottom, making the nozzle base more susceptible to damage. Additionally, during cutting, the nozzle may impact the sheet metal due to operational or running errors, causing stress damage and reducing its lifespan. Moreover, the presence of rust, molten slag, or other impurities affecting the flatness of the metal plate surface will also reduce cutting efficiency and surface finish. Summary of the Invention

[0003] One objective of this invention is to reduce the risk of molten slag adhering to the nozzle.

[0004] Another objective of this invention is to improve the temperature uniformity of the nozzle and thus improve the cutting quality.

[0005] Specifically, the present invention provides a metal plate laser cutting device for manufacturing gantry milling machine parts, comprising: a machine tool, a laser cutting assembly, and a protective cover; the machine tool is provided with a laser cutting assembly; the laser cutting assembly includes a main body and a nozzle disposed at the bottom of the main body; the protective cover is fitted around the outer periphery of the nozzle; the inner wall of the protective cover and the outer wall of the nozzle are adapted to each other, and an annular cavity is formed between the protective cover and the nozzle; the nozzle is provided with a plurality of circumferentially evenly distributed ventilation pipes, which gradually approach the inner side of the nozzle from the top of the nozzle and communicate radially outward with the annular cavity after approaching the bottom of the nozzle; auxiliary gas is flowed in the ventilation pipes and blown radially toward the annular cavity.

[0006] Furthermore, the metal plate laser cutting device for manufacturing gantry machine tool components also includes: a limiting ring, which is disposed between the main body and the nozzle and is threadedly connected to the main body; the limiting ring is provided with an air intake passage that blows towards the top of the nozzle for supplying auxiliary gas into the air supply line.

[0007] Furthermore, the metal plate laser cutting device for manufacturing gantry milling machine parts also includes: a first rotating ring, rotatably disposed between a limiting ring and a nozzle; the first rotating ring includes a first inner ring and a first outer ring coaxially disposed, and a plurality of first blades evenly distributed circumferentially are connected between the first inner ring and the first outer ring; a first section of the first blade near the first inner ring is inclined in the vertical direction and is opposite to the ventilation pipe; the first section rotates under the push of the auxiliary gas blown out of the air inlet passage; the first section is inclined in the radial direction from the inside out toward its rotation direction, so that part of the auxiliary gas enters the ventilation pipe under the push of the rotating first section.

[0008] Furthermore, a first opening is provided at a position relative to the area between any two adjacent first blades on the first outer ring. The second section of the first blade near the first outer ring is inclined in the radial direction from the inside to the outside away from its rotation direction, so that part of the auxiliary gas is blown out through the first opening under the push of the rotating second section.

[0009] Furthermore, the metal plate laser cutting device for manufacturing gantry milling machine parts also includes: a second rotating ring, rotatably disposed between the nozzle and the protective cover, with a gap formed between the second rotating ring and the protective cover; the second rotating ring includes a second inner ring and a second outer ring arranged coaxially, with a plurality of second blades evenly distributed circumferentially connected between the second inner ring and the second outer ring; a connecting ring is provided at the top of the second outer ring, and the connecting ring is fixedly connected to the bottom end of the first outer ring; the second blades are inclined from top to bottom away from their rotation direction, so that the gas between any two adjacent second blades is pushed close to the inner wall of the protective cover by the rotating second blades.

[0010] Furthermore, the second blade is inclined in the radial direction from the inside out, away from its rotation direction, so that the gas between any two adjacent second blades is discharged radially outward under the push of the rotating second blade.

[0011] Furthermore, the protective cover is rotatably mounted on the outer periphery of the nozzle, and a grinding element is provided at the bottom end of the protective cover.

[0012] Furthermore, multiple vertically downward positioning shafts are evenly arranged on the limiting ring, and each positioning shaft is fitted with a rotatable friction ring; the friction ring is located between the first outer ring and the protective cover, and makes frictional contact with the outer wall of the first outer ring and the inner wall of the protective cover.

[0013] Furthermore, the friction ring is made of rubber.

[0014] The present invention also provides a method for laser cutting of metal plates for manufacturing gantry machine tool components, and a method for performing the above-mentioned laser cutting device for manufacturing gantry machine tool components, comprising the following steps: S102, controlling the laser cutting component to emit laser light and move along a set trajectory on the machine tool to perform cutting; S104, injecting auxiliary gas into the ventilation pipe, so that the auxiliary gas is blown radially towards the annular cavity between the nozzle and the protective cover.

[0015] The beneficial effects of this invention are:

[0016] The present invention relates to a metal plate laser cutting device for manufacturing gantry milling machine components. By installing a protective cover over the nozzle, the device effectively shields the nozzle, reducing the risk of molten slag adhering to it. It also mitigates wake phenomena near the nozzle, thereby reducing the risk of uneven thermal stress distribution at the nozzle and ensuring cutting efficiency. Furthermore, by incorporating multiple circumferentially distributed ventilation channels on the nozzle, the auxiliary gas flows downwards within these channels and then radially outwards. This allows the hot gas generated at the cutting point to flow through the protective cover to the bottom of the nozzle. The gas is then carried by the radially flowing auxiliary gas towards the inner wall of the protective cover and then flows upwards along its inner wall, further reducing the thermal impact of the hot gas on the nozzle. The radially blown auxiliary gas creates an airflow field at the bottom of the nozzle, further reducing the risk of molten slag splashing and adhering to the nozzle.

[0017] Furthermore, the metal plate laser cutting device for manufacturing gantry milling machine parts of the present invention, by setting a first rotating ring and a second rotating ring, utilizes auxiliary gas blown out through the air inlet passage to rotate the first rotating ring and the second rotating ring. The rotating first and second blades push the auxiliary gas, carrying the hot gas generated during cutting, away from the nozzle, thereby reducing the risk of nozzle deformation due to uneven temperature and ensuring cutting efficiency and quality.

[0018] The metal plate laser cutting method for manufacturing gantry machine tool components of the present invention also possesses the beneficial technical effects of the aforementioned metal plate laser cutting apparatus for manufacturing gantry machine tool components. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. In the drawings:

[0020] Figure 1 This is a schematic diagram of a metal plate laser cutting device for manufacturing gantry milling machine parts according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a laser cutting assembly according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a laser cutting assembly according to an embodiment of the present invention from another angle;

[0023] Figure 4 It is along Figure 3 A schematic cross-sectional view taken by the cutting line AA in the diagram;

[0024] Figure 5 yes Figure 4 A schematic enlarged view of region B in the middle;

[0025] Figure 6 This is a schematic diagram of the structure of a nozzle, a protective cover, a limiting ring, a first rotating ring, and a second rotating ring according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of a first rotating ring according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the second rotating ring according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of a nozzle according to an embodiment of the present invention;

[0029] Figure 10 This is a schematic flowchart of a metal plate laser cutting method for manufacturing gantry milling machine parts according to an embodiment of the present invention.

[0030] in:

[0031] 10. Machine tool; 100. Laser cutting assembly; 110. Main body; 120. Nozzle; 121. Ventilation pipe; 130. Annular cavity; 140. Fixing ring; 150. Connecting piece; 200. Protective cover; 210. Grinding part; 300. Limiting ring; 310. Air inlet passage; 311. Air inlet; 320. Positioning shaft; 330. Friction ring; 400. First rotating ring; 410. First inner ring; 420. First outer ring; 421. First opening; 430. First blade; 431. First section; 432. Second section; 500. Second rotating ring; 510. Second inner ring; 520. Second outer ring; 530. Second blade; 540. Connecting ring. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The terms "first," "second," and "third" used herein are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0034] Unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The following reference Figures 1 to 10 This invention describes a method and apparatus for laser cutting metal plates for manufacturing components of a gantry milling machine.

[0036] This embodiment first provides a metal plate laser cutting device for manufacturing gantry milling machine parts. The metal plate laser cutting device for manufacturing gantry milling machine parts generally includes: a machine tool 10, a laser cutting assembly 100, and a protective cover 200.

[0037] A laser cutting assembly 100 is mounted on the machine tool 10. The laser cutting assembly 100 includes a main body 110 and a nozzle 120 disposed at the bottom of the main body 110. A protective cover 200 is fitted around the outer periphery of the nozzle 120. The inner wall of the protective cover 200 is adapted to the outer wall of the nozzle 120, and an annular cavity 130 is formed between the protective cover 200 and the nozzle 120. A plurality of circumferentially evenly distributed ventilation pipes 121 are provided on the nozzle 120. The ventilation pipes 121 gradually approach the inner side of the nozzle 120 from the top of the nozzle 120, and after approaching the bottom of the nozzle 120, they connect radially outward to the annular cavity 130. Auxiliary gas is blown radially into the annular cavity 130 through the ventilation pipes 121.

[0038] In this embodiment, by installing a protective cover 200 over the nozzle 120, the nozzle 120 can be shielded, reducing the risk of molten slag adhering to the nozzle 120. On the other hand, the wake phenomenon near the nozzle 120 can be reduced, thereby reducing the risk of uneven thermal stress distribution at the nozzle 120 and ensuring cutting efficiency and cutting quality.

[0039] Furthermore, in this embodiment, by providing multiple circumferentially evenly distributed ventilation pipes 121 on the nozzle 120, the auxiliary gas flows downward within the ventilation pipes 121 and then is blown out radially. This allows the hot gas generated at the cutting point to flow through the protective cover 200 to the bottom of the nozzle 120, where it is then carried by the radially flowing auxiliary gas towards the inner wall of the protective cover 200, and then flows upward at an angle along the inner wall of the protective cover 200. This reduces the thermal impact of the hot gas generated during cutting on the nozzle 120. In addition, the radially blown auxiliary gas forms an airflow field at the bottom of the nozzle 120, further reducing the risk of molten slag splashing and adhering to the nozzle 120.

[0040] In some preferred embodiments, the auxiliary gas is a low-temperature airflow, which isolates the splashed molten slag and hot gas while cooling the hot gas, thereby reducing the risk of uneven temperature in the nozzle 120. The ventilation pipe 121 is set close to the side wall of the nozzle 120, so that when the auxiliary gas flows from top to bottom, it can cool the side wall of the nozzle 120, thereby reducing the temperature difference of the nozzle 120 in the axial direction, further reducing the risk of deformation of the nozzle 120 due to uneven temperature, and improving cutting efficiency and cutting quality.

[0041] like Figure 5 As shown, a retaining ring 140 and a connector 150 can be provided between the main body 110 and the nozzle 120, and the main body 110, retaining ring 140, connector 150, and nozzle 120 are sequentially threaded together. Figure 6 As shown, the upper end face of the nozzle 120 that connects with the ventilation pipe 121 can be provided with an annular conical groove to make the flow of auxiliary gas into the ventilation pipe 121 smoother.

[0042] The thicker the metal sheet being cut, the more molten slag will be generated during cutting. In some preferred embodiments, the flow rate and velocity of the auxiliary gas are positively correlated with the thickness of the metal sheet to be cut, thereby further reducing the risk of molten slag adhering to the nozzle 120.

[0043] A metal sheet laser cutting apparatus for manufacturing components of a gantry milling machine may also generally include a limiting ring 300. The limiting ring 300 is disposed between the main body 110 and the nozzle 120 and is threadedly connected to the main body 110. The limiting ring 300 is provided with an air inlet passage 310 that blows toward the tip of the nozzle 120 for supplying auxiliary gas into the air supply line 121.

[0044] like Figure 6 As shown, the side of the limiting ring 300 is provided with an air inlet 311 that communicates with the air intake passage 310. The air inlet 311 can be connected to an external air pump to deliver auxiliary gas into the air intake passage 310.

[0045] In this embodiment, a limiting ring 300 is provided between the main body 110 and the nozzle 120, and the air intake passage 310 in the limiting ring 300 blows auxiliary gas to the top of the nozzle 120, thereby allowing the auxiliary gas to be sent into the ventilation pipe 121 from top to bottom. The limiting ring 300 and the main body 110 are connected by threads, thereby improving the structural stability of the limiting ring 300.

[0046] A laser cutting apparatus for metal plates used in the manufacture of gantry milling machine parts may generally also include a first rotating ring 400. The first rotating ring 400 is rotatably disposed between a limiting ring 300 and a nozzle 120. The first rotating ring 400 includes a first inner ring 410 and a first outer ring 420 coaxially arranged, with a plurality of circumferentially evenly distributed first blades 430 connected between the first inner ring 410 and the first outer ring 420. A first section 431 of the first blade 430 near the first inner ring 410 is inclined in the vertical direction and opposite to the ventilation pipe 121. The first section 431 rotates under the push of auxiliary gas blown out of the air intake passage 310. The first section 431 is inclined radially from the inside out towards its rotation direction, so that part of the auxiliary gas enters the ventilation pipe 121 under the push of the rotating first section 431.

[0047] In this embodiment, a first rotating ring 400 with a first blade 430 is provided between the limiting ring 300 and the nozzle 120. The first section 431 of the first blade 430, opposite the auxiliary gas, is inclined vertically. When the auxiliary gas is blown downwards from the intake passage 310, the airflow impacts the first section 431, pushing the first blade 430 to rotate, which in turn causes the first rotating ring 400 to rotate. As the first section 431 rotates, the auxiliary gas between two adjacent first sections 431 is forced into the ventilation pipe 121 in the lower nozzle 120.

[0048] Furthermore, in this embodiment, the first section 431 is set to be inclined in the radial direction from the inside out toward its rotation direction, so that when the first section 431 rotates, it pushes the auxiliary gas to flow inward along the first section 431, thereby better squeezing the auxiliary gas into the ventilation pipe 121.

[0049] Preferably, a gap is formed between the first rotating ring 400, the limiting ring 300, and the nozzle 120 to reduce the frictional resistance when the first rotating ring 400 rotates and ensure the smoothness of the rotation of the first rotating ring 400.

[0050] A first opening 421 is provided on the first outer ring 420 at a position opposite to the area between any two adjacent first blades 430. The second section 432 of the first blade 430 near the first outer ring 420 is inclined in the radial direction from the inside to the outside away from its rotation direction, so that part of the auxiliary gas is blown out through the first opening 421 under the push of the rotating second section 432.

[0051] In this embodiment, the second section 432 of the first blade 430 is configured to be inclined radially outward from its rotation direction (i.e., the inclination direction of the second section 432 is opposite to that of the first section 431). This allows the auxiliary gas located between two adjacent second sections 432 to flow radially outward under the influence of the second section 432 as it rotates. After passing radially through the first opening 421 on the first outer ring 420, the auxiliary gas blows the hot air flowing upward along the inner wall of the protective cover 200 away from the nozzle 120, thereby further reducing the impact of the hot air on the nozzle 120 and ensuring cutting efficiency and quality.

[0052] The metal plate laser cutting apparatus used for manufacturing gantry milling machine parts may also generally include a second rotating ring 500. The second rotating ring 500 is rotatably disposed between the nozzle 120 and the protective cover 200, and a gap is formed between the second rotating ring 500 and the protective cover 200. The second rotating ring 500 includes a second inner ring 510 and a second outer ring 520 coaxially arranged, and a plurality of second blades 530 evenly distributed circumferentially are connected between the second inner ring 510 and the second outer ring 520. A connecting ring 540 is provided at the top of the second outer ring 520, and the connecting ring 540 is fixedly connected to the bottom end of the first outer ring 420. The second blades 530 are inclined from top to bottom away from their rotation direction, so that the gas between any two adjacent second blades 530 is pushed close to the inner wall of the protective cover 200 by the rotating second blades 530.

[0053] In this embodiment, a second rotating ring 500 is provided between the nozzle 120 and the protective cover 200. The second rotating ring 500 and the first rotating ring 400 are fixedly connected by a connecting ring 540, so that when the first rotating ring 400 rotates, it drives the second rotating ring 500 to rotate synchronously. The second blade 530 in the second rotating ring 500 is set to be inclined from top to bottom away from its rotation direction, so that when the second blade 530 rotates, the gas between two adjacent second blades 530 is pushed by the second blade 530 towards the inner wall of the protective cover 200, thereby preventing the hot gas generated by cutting from getting close to the outer wall of the nozzle 120, and thus reducing the risk of the nozzle 120 deforming due to uneven temperature.

[0054] The gap between the second rotating ring 500 and the nozzle 120 and the protective cover 200 can reduce the frictional resistance of the second rotating ring 500 and ensure the smooth rotation of the second rotating ring 500. On the other hand, it provides flow space for the airflow, so that the airflow between the nozzle 120 and the protective cover 200 flows out from the gap between the second rotating ring 500 and the protective cover 200.

[0055] In some embodiments, a second opening may be provided on the second outer ring 520 and a third opening may be provided on the second inner ring 510, so that the airflow between the nozzle 120 and the protective cover 200 is smoother.

[0056] The second blade 530 is inclined in the radial direction from the inside to the outside, away from its rotation direction, so that the gas between any two adjacent second blades 530 is discharged radially outward under the push of the rotating second blade 530.

[0057] In this embodiment, the second blade 530 is set to be inclined from the inside out in the radial direction away from its rotation direction, so that when the second blade 530 rotates, it can push the airflow outward along the inner wall of the protective cover 200, thereby accelerating the discharge of airflow between the nozzle 120 and the protective cover 200, thereby reducing the thermal impact of hot airflow on the nozzle 120 and ensuring cutting efficiency and cutting effect.

[0058] The protective cover 200 is rotatably disposed on the outer periphery of the nozzle 120, and a grinding element 210 is provided at the bottom end of the protective cover 200.

[0059] like Figure 5 As shown, the protective cover 200 is generally conical in shape to match the nozzle 120, and a notch is formed at the bottom of the protective cover 200 to allow the laser to pass through. The grinding component 210 is annular, located at the bottom of the protective cover, and is coaxially arranged with the nozzle 120.

[0060] In this embodiment, the protective cover 200 is rotatably disposed on the outer periphery of the nozzle 120, and a grinding component 210 is disposed at the bottom end of the protective cover 200. The rotation of the protective cover 200 drives the grinding component 210 to rotate synchronously, thereby performing pre-treatment and post-treatment on the surface of the cut metal plate (i.e., grinding the surface of the metal plate before cutting and grinding the slag adhering to the surface of the metal plate after cutting), thereby improving the surface smoothness of the metal plate and improving cutting efficiency and cutting quality.

[0061] The limiting ring 300 is evenly provided with a plurality of vertically downward positioning shafts 320, and each positioning shaft 320 is fitted with a rotatable friction ring 330. The friction ring 330 is located between the first outer ring 420 and the protective cover 200, and is in frictional contact with the outer wall of the first outer ring 420 and the inner wall of the protective cover 200.

[0062] In this embodiment, a friction ring 330 is provided between the first outer ring 420 and the protective cover 200 for frictional contact. When the first outer ring 420 rotates, the friction ring 330 can drive the protective cover 200 to rotate, thereby driving the grinding part 210 to rotate and grinding the surface of the metal plate. This solution is not only ingenious and inexpensive, but also stable in operation and easy to maintain.

[0063] like Figure 5 As shown, the protective cover 200 may have raised edges at positions opposite to the upper and lower ends of the friction ring 330 to improve structural stability.

[0064] like Figure 5 As shown, the height of the friction ring 330 is greater than the height of the first opening 421 on the first outer ring 420. The friction ring 330 is always in contact with the first outer ring 420 to ensure that the friction ring 330 can rotate continuously as the first outer ring 420 rotates.

[0065] In other embodiments, the friction ring 330 may be configured to maintain contact with the upper or lower edge of the first outer ring 420 and be offset from the first opening 421 on the first outer ring 420, so that the auxiliary gas flows more smoothly through the first opening 421.

[0066] The friction ring 330 is made of rubber.

[0067] In this embodiment, the friction ring 330 is made of rubber, which is not only inexpensive, wear-resistant, and has a long service life, but also can absorb shock when the protective cover 200 collides with the metal plate to be cut, protecting components such as the nozzle 120 located inside the protective cover 200 and reducing the risk of damage to components such as the nozzle 120.

[0068] The specific working process of the metal plate laser cutting device for manufacturing gantry milling machine parts provided by the present invention will be described in conjunction with the above embodiments:

[0069] First, the metal plate to be cut is placed on the machine tool 10. Then, the laser cutting assembly 100 is controlled to emit a laser and move along a set trajectory on the machine tool 10 to cut the metal plate into the required shape.

[0070] During the cutting process of the laser cutting assembly 100, auxiliary gas is injected into the air intake passage 310 through the air inlet 311. After being blown out of the air intake passage 310, the auxiliary gas passes through the first rotating ring 400 and flows into the ventilation pipe 121, then flows from top to bottom in the ventilation pipe 121 and is blown out radially. Afterward, the auxiliary gas carries the hot air generated by the cutting towards the second rotating ring 500 and the protective cover 200.

[0071] When the auxiliary gas passes through the first rotating ring 400, it pushes the first blade 430 to rotate, causing the entire first rotating ring 400 to rotate. As the first rotating ring 400 rotates, it drives the connected second rotating ring 500 to rotate via the connecting ring 540. When the second rotating ring 500 rotates, the second blade 530 pushes the airflow between the nozzle 120 and the protective cover 200 close to the inner wall of the protective cover 200 and then discharges it radially outward. When the first blade 431 rotates, the first section 431 pushes the auxiliary gas towards the ventilation pipe 121, and the second section 432 pushes the auxiliary gas radially towards the first opening 421. After the auxiliary gas passes through the first opening 421 and is blown out, it carries the airflow blown from between the protective cover 200 and the nozzle 120 and is blown far away.

[0072] like Figure 10 As shown, this embodiment also provides a method for laser cutting metal plates for manufacturing gantry milling machine parts, using a metal plate laser cutting apparatus for manufacturing gantry milling machine parts as described above, comprising the following steps:

[0073] S102, control the laser cutting component 100 to emit laser light and move along a set trajectory on the machine tool 10 to perform cutting.

[0074] S104, inject auxiliary gas into the ventilation pipe 121, so that the auxiliary gas is blown radially toward the annular cavity 130 between the nozzle 120 and the protective cover 200.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A laser cutting device for metal plates used in the manufacturing of gantry milling machine parts, characterized in that, include: A machine tool on which a laser cutting assembly is installed; the laser cutting assembly includes a main body and a nozzle disposed at the bottom of the main body; A protective cover is fitted around the outer periphery of the nozzle; the inner wall of the protective cover is adapted to the outer wall of the nozzle, and an annular cavity is formed between the protective cover and the nozzle. The nozzle is equipped with multiple venting pipes evenly distributed around the circumference. The venting pipes gradually approach the inner side of the nozzle from the top of the nozzle and connect to the annular cavity radially outward after approaching the bottom of the nozzle. Auxiliary gas is blown radially into the annular cavity through the venting pipes. A limiting ring is set between the main body and the nozzle and is threadedly connected to the main body; the limiting ring is provided with an air inlet passage that blows towards the top of the nozzle, for supplying auxiliary gas into the ventilation pipeline; The first rotating ring is rotatably disposed between the limiting ring and the nozzle. The first rotating ring includes a first inner ring and a first outer ring arranged coaxially. A plurality of first blades are connected between the first inner ring and the first outer ring and are evenly distributed in the circumferential direction. The first section of the first blade near the first inner ring is inclined in the vertical direction and is opposite to the ventilation pipe. The first section rotates under the push of the auxiliary gas blown out of the air intake passage. The first section is inclined in the radial direction from the inside to the outside towards its rotation direction, so that part of the auxiliary gas enters the ventilation pipe under the push of the rotating first section. The second rotating ring is rotatably disposed between the nozzle and the protective cover, and a gap is formed between the second rotating ring and the protective cover; the second rotating ring includes a second inner ring and a second outer ring arranged coaxially, and a plurality of second blades evenly distributed in the circumferential direction are connected between the second inner ring and the second outer ring; a connecting ring is provided at the top of the second outer ring, and the connecting ring is fixedly connected to the bottom end of the first outer ring; the connecting ring fixes the second rotating ring and the first rotating ring together, so that when the first rotating ring rotates, it drives the second rotating ring to rotate synchronously. The second blade is tilted from top to bottom away from its rotation direction, so that the gas between any two adjacent second blades is pushed close to the inner wall of the protective cover by the rotating second blade. A first opening is provided at a position relative to the area between any two adjacent first blades on the first outer ring. The second section of the first blade near the first outer ring is inclined in the radial direction from the inside to the outside away from its rotation direction, so that part of the auxiliary gas is blown out through the first opening under the push of the rotating second section.

2. The metal plate laser cutting device for manufacturing gantry milling machine parts according to claim 1, characterized in that, The second blade is inclined in the radial direction from the inside out, away from its rotation direction, so that the gas between any two adjacent second blades is discharged radially outward under the push of the rotating second blade.

3. The metal plate laser cutting device for manufacturing gantry milling machine parts according to claim 1, characterized in that, The protective cover is rotatably mounted on the outer periphery of the nozzle, and a grinding element is provided at the bottom of the protective cover.

4. The metal plate laser cutting device for manufacturing gantry milling machine parts according to claim 3, characterized in that, The limiting ring is evenly provided with multiple vertically downward positioning shafts, and each positioning shaft is fitted with a rotatable friction ring; the friction ring is located between the first outer ring and the protective cover, and is in frictional contact with the outer wall of the first outer ring and the inner wall of the protective cover.

5. The metal plate laser cutting device for manufacturing gantry milling machine parts according to claim 4, characterized in that, The friction ring is made of rubber.

6. A method for laser cutting metal plates for manufacturing components of a gantry milling machine, characterized in that, Using the metal plate laser cutting apparatus for manufacturing gantry milling machine parts as described in any one of claims 1 to 5, the process includes the following steps: The laser cutting component is controlled to emit a laser and move along a set trajectory on the machine tool to perform cutting; auxiliary gas is injected into the ventilation pipeline so that the auxiliary gas is blown radially into the annular cavity between the nozzle and the protective cover.

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