Numerical control laser cutting machine tool

Abstract

The invention relates to the technical field of cutting machining, in particular to a numerical control laser cutting machine tool which comprises a base, a laser controlled by a driving assembly to move is arranged on the upper side of the base, a supporting mechanism used for flexibly supporting a material plate is arranged on the upper side of the base, and a protection mechanism used for protecting the supporting mechanism is arranged on the driving assembly. The nail plates are adopted for mainly supporting the material plate, the protective bowls are matched with the lifting assemblies to drive the corresponding nail plates to move downwards for avoiding, the protective bowls can effectively shield the nail plates in a dynamic following mode, and under the condition that the position of a workpiece does not need to be manually adjusted, laser beams are prevented from directly cutting the nail plates; meanwhile, splashing residues in the cutting process are reliably collected, the residues are prevented from being attached to the surface of the nail plate, so that the height of the nail plate is always uniform, long-term stable supporting without human intervention is conducted on material plates cut in a large scale, and machining operation without manual intervention, low maintenance frequency and high cutting quality is achieved.

Description

Technical Field

[0001] This invention relates to the field of cutting and processing technology, specifically a CNC laser cutting machine tool. Background Technology

[0002] With the development of laser technology, laser cutting has gradually become an important means of steel processing. It has the advantages of fast cutting speed and high precision. In the laser cutting process, the flatness of the material plate is crucial. Uneven material plates are prone to deviation of the cutting trajectory, reduced cut quality, and even damage to equipment during cutting.

[0003] Existing CNC laser cutting machine tools typically use support plates to support the material plate, so that the material plate is arranged flat in the processing area. During cutting, the drive assembly controls the laser to move along a preset trajectory to cut the material plate. At the same time, protective gas is blown from top to bottom to assist the cutting process, disperse molten slag, and prevent oxidation of the cut.

[0004] However, existing machine tools use fixed support plates during cutting. In actual cutting, the high-energy laser beam can easily penetrate the material plate and cut the support plate below, resulting in damage and reduced height of the support plate. At the same time, metal residue splashed during cutting can easily adhere to the surface of the support plate, forming bulges. The combination of these factors ultimately makes the support plate uneven, which in turn affects the flatness of the material plate and ultimately has an adverse effect on the cutting accuracy.

[0005] While existing methods can avoid laser beam cutting of support plates by placing the cutting position between two adjacent support plates, this method is only suitable for small-scale cutting and requires manual adjustment of the workpiece position. This is not only cumbersome but also significantly reduces processing efficiency, making it difficult to meet the needs of large-scale, high-precision production. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a CNC laser cutting machine tool, including a base, a laser controlled by a drive assembly moving on the upper side of the base, a support mechanism for flexibly supporting the material plate on the upper side of the base, and a protective mechanism for protecting the support mechanism on the drive assembly.

[0007] The support mechanism includes several nail plates arranged at equal intervals on the left and right, the nail plates being slidably connected to the base and used to provide the main support for the material plate, and a lifting assembly for driving the nail plates.

[0008] The protective mechanism includes a movable seat connected to the lower part of the drive assembly via a synchronization component. The lifting component automatically moves down to avoid the movable seat corresponding to the nail plate. A protective bowl made of high-temperature resistant material is detachably installed inside the movable seat. The synchronization component drives the protective bowl to move with the laser via the movable seat, so that the protective bowl is always located in a coaxial position below the laser. An auxiliary support component for supporting the material plate is installed on the protective bowl.

[0009] When the laser moves to cut, a protective bowl dynamically blocks the nail plate following the laser beam. On the one hand, it collects the residue and prevents it from splashing and adhering to the nail plate, which would cause the nail plate to rise. On the other hand, it works with the nail plate to automatically move down to prevent the nail plate from being cut and causing it to lower. This allows the nail plate to provide long-term stable support for the material plate without human intervention.

[0010] Preferably, the lifting assembly includes an explosion-proof electric cylinder fixedly installed on the base and corresponding to a nail plate, wherein the telescopic section of the explosion-proof electric cylinder is fixedly connected to the nail plate at the corresponding position.

[0011] Preferably, the drive assembly includes a track frame that slides left and right on the base. The track frame is slidably connected to the laser in the front and back. The laser moves flexibly along a preset trajectory on the X, Y, and Z axes by extending and retracting itself, moving back and forth on the track frame, and moving left and right on the track frame.

[0012] Preferably, the synchronization component includes a fixed frame that is fixedly mounted on the track frame, and a movable seat that is slidably connected to the fixed frame, with the upper side of the movable seat being lower than the upper side of the nail plate that has not been lowered.

[0013] Preferably, a lead screw that is threadedly engaged with the movable seat is rotatably mounted on the fixed frame, and an explosion-proof motor for driving the lead screw to rotate is fixedly installed on the front side of the fixed frame.

[0014] Preferably, the auxiliary support assembly includes a plurality of studs threadedly connected to the movable seat and evenly distributed circumferentially, with balls rolled on the upper part of the studs, the upper part of the balls protruding from the upper surface of the movable seat, thereby providing rolling support for the lower side of the material plate.

[0015] Preferably, a retaining ring for shielding and protecting the ball is detachably installed on the upper side of the movable seat, and the upper side of the retaining ring is lower than the upper side of the ball.

[0016] Preferably, a return air pipe is fixedly installed on the movable seat at equal intervals along its circumference. The return air pipe is staggered with the ball bearing. A guide hole communicating with the inside and outside is opened at the lower part of the protective bowl. The air inlet at the lower end of the return air pipe receives a part of the gas discharged from the guide hole and then guides it to the inner side of the upper end of the retaining ring through the outlet at the upper end of the return air pipe.

[0017] Preferably, the bottom wall of the protective bowl has a conical structure with the center bulging upwards, and there is a gap between the air guide hole of the protective bowl and the air inlet at the lower end of the return air pipe.

[0018] Preferably, an asbestos mesh is detachably installed in the middle of the inner side of the protective bowl, and the protective bowl is made of high-temperature resistant ceramic material.

[0019] The beneficial effects of this invention are as follows: First, this invention uses several controllable vertically moving nail plates to provide the main support for the material plate. A protective bowl that moves synchronously with the laser, along with a lifting assembly, drives the corresponding nail plate downwards to avoid it. This allows the protective bowl to dynamically and effectively shield the nail plate, preventing the laser beam from directly cutting the nail plate without requiring manual adjustment of the workpiece position. Simultaneously, it reliably collects the debris splashed during cutting, preventing it from adhering to the nail plate surface, thus ensuring a consistently uniform nail plate height. This provides long-term, unattended, stable support for large-volume cutting of material plates, achieving processing operations that require no manual intervention, have low maintenance frequency, and high cutting quality.

[0020] Second, this invention uses a movable seat to drive the protective bowl to move synchronously with the laser below the material plate. When the laser beam penetrates the material plate, it will enter the protective bowl made of high-temperature resistant ceramic material, thereby completely avoiding the laser beam from causing cutting damage to the nail plate behind or around it, preventing it from reducing its height due to defects. At the same time, the bowl-shaped structure of the protective bowl can effectively receive and collect the metal residue generated and splashed downward during the cutting process, fundamentally preventing the residue from adhering to the nail plate surface and forming bulges, and avoiding the impact of uneven nail plate height on the support accuracy.

[0021] Third, this invention employs a return air pipe in conjunction with an air guide hole at the bottom of the protective bowl. This allows a portion of the auxiliary gas blown into the protective bowl from top to bottom to be redirected back to the inner area of ​​the upper end of the retaining ring via the return air pipe. This airflow circulation design creates a stable positive pressure environment at the upper edge of the protective bowl, effectively suppressing the phenomenon of residue being blown upwards and escaping due to turbulent airflow inside the protective bowl. This significantly improves the collection effect and reliability of the protective bowl for residue, further reducing the possibility of residue adhering to the nail plate and increasing its height, and further improving the support stability of the nail plate after long-term use.

[0022] Fourth, in this invention, during cutting, the movable seat drives the ball bearings to roll against the lower side of the material plate, so that the ball bearings provide auxiliary support for the cutting position of the material plate, thereby allowing the ball bearings to replace the downward-moving nail plate in time, providing auxiliary support for the cutting position of the material plate, and ensuring that the material plate is always in a flat state. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is the left view of the present invention.

[0026] Figure 3 This is a partial cross-sectional view of the base, nail plate, and explosion-proof electric cylinder in this invention.

[0027] Figure 4 This is a schematic diagram of the structure of the fixing frame, lead screw, protective mechanism and nail plate in this invention.

[0028] Figure 5 This is a schematic diagram of the structure of the movable seat, protective bowl, asbestos mesh and ball bearings in this invention.

[0029] Figure 6 This is a partial cross-sectional view of the movable seat, protective bowl, stud, and return air pipe in this invention.

[0030] Figure 7 This is a partial cross-sectional view of the movable seat, protective bowl, asbestos mesh, and return air pipe in this invention.

[0031] Figure 8 This is a cross-sectional view of the protective bowl in this invention.

[0032] In the diagram: 1. Base; 2. Drive assembly; 3. Laser; 4. Support mechanism; 5. Protective mechanism; 21. Track frame; 41. Nail plate; 42. Lifting assembly; 51. Synchronization assembly; 52. Moving seat; 53. Protective bowl; 54. Auxiliary support assembly; 421. Explosion-proof electric cylinder; 511. Fixing frame; 512. Lead screw; 513. Explosion-proof motor; 521. Guard ring; 522. Return air pipe; 531. Asbestos mesh; 541. Stud; 542. Ball bearing. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0034] See Figure 1 , Figure 2 and Figure 4 A CNC laser cutting machine tool includes a base 1, a laser 3 controlled by a drive assembly 2 is disposed on the upper side of the base 1, a support mechanism 4 for flexibly supporting the material plate is disposed on the upper side of the base 1, and a protective mechanism 5 for protecting the support mechanism 4 is disposed on the drive assembly 2.

[0035] See Figure 1 and Figure 2The drive assembly 2 includes a track frame 21 that slides left and right on the base 1. The track frame 21 is slidably connected to the laser 3. The track frame 21 is equipped with a track drive structure commonly found on machine tools in the prior art, which enables the track frame 21 to not only slide left and right, but also drive the laser 3 to move back and forth on the track frame 21. In addition, the laser 3 uses a component with telescopic function in the prior art, so that the laser 3 can move flexibly along a preset trajectory on the X, Y, and Z axes by its own vertical extension and retraction, its back and forth movement on the track frame 21, and the left and right movement of the track frame 21.

[0036] See Figure 1 , Figure 2 and Figure 3 The support mechanism 4 includes several nail plates 41 arranged at equal intervals on the left and right sides. The nail plates 41 are slidably connected to the base 1 and are used to provide the main support for the material plate. The support mechanism 4 also includes a lifting assembly 42 for driving the nail plates 41.

[0037] See Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8 The protective mechanism 5 includes a movable seat 52 connected to the lower part of the drive assembly 2 via a synchronization component 51. The synchronization component 51 includes a fixed frame 511 fixedly mounted on the track frame 21. The movable seat 52 is slidably connected to the fixed frame 511. A lead screw 512 that is threadedly engaged with the movable seat 52 is rotatably mounted on the fixed frame 511. An explosion-proof motor 513 for driving the lead screw 512 to rotate is fixedly mounted on the front side of the fixed frame 511. The upper side of the movable seat 52 is lower than the upper side of the nail plate 41 that has not been lowered. A high-temperature resistant protective bowl 53 is detachably installed inside the movable seat 52. An asbestos mesh 531 is detachably installed in the middle of the inner side of the protective bowl 53. The protective bowl 53 is made of high-temperature resistant ceramic material.

[0038] During cutting, the laser 3 moves above the material plate along a preset trajectory. The fixed frame 511 is fixedly connected to the track frame 21, so that the moving seat 52 moves left and right synchronously with the laser 3. At the same time, by controlling the rotation of the explosion-proof motor 513, the explosion-proof motor 513 drives the moving seat 52 to move back and forth synchronously with the laser 3 through the lead screw 512. This ensures that the protective bowl 53 inside the moving seat 52 is always located at the lower part of the coaxial position of the laser 3, so that the protective bowl 53 can block the laser beam emitted by the laser 3 and prevent the laser beam from cutting the nail plate 41, thus reducing the height of the nail plate 41.

[0039] During the cutting process, the existing air-blowing structure blows protective gas from top to bottom, which not only prevents oxidation of the cut but also blows away the hot residue generated during cutting. The residue passes through the cut on the material plate and falls into the protective bowl 53. The asbestos mesh 531 inside the protective bowl 53 effectively adheres to and retains the hot residue, preventing it from rebounding or splashing. This prevents the residue from splashing and adhering to the nail plate 41, thus increasing the height of the nail plate 41. This ensures that the nail plate 41 can maintain a uniform height even after long-term use, providing long-term stable support for the material plate.

[0040] It is worth noting that by periodically disassembling, cleaning, or replacing the protective bowl 53, the collected residue can be treated to ensure the effective collection of residue by the protective bowl 53, thereby further preventing residue from adhering to the nail plate 41 and causing the nail plate 41 to increase in height.

[0041] To enable the laser 3 to move over a wide range and avoid manual adjustment of the material plate's position, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 and Figure 4 The lifting assembly 42 includes an explosion-proof electric cylinder 421 fixedly installed on the base 1 and corresponding to the nail plate 41. The telescopic section of the explosion-proof electric cylinder 421 is fixedly connected to the nail plate 41 at the corresponding position. The lifting assembly 42 avoids the moving seat 52 by moving the corresponding nail plate 41 downward, so that the protective bowl 53 is always located in the coaxial position at the lower part of the laser 3.

[0042] By retracting the telescopic section of the explosion-proof electric cylinder 421 at the corresponding position, the corresponding nail plate 41 is completely moved down to the lower part of the fixing frame 511. On the one hand, this prevents the nail plate 41 from obstructing the movement of the protective bowl 53. On the other hand, when the laser 3 is cutting directly above the nail plate 41, the downward movement of the nail plate 41 at that position allows the protective bowl 53 to move above the downward-moving nail plate 41, thereby shielding the nail plate 41 from cutting, collecting residue, preventing residue adhesion, and avoiding the nail plate 41 from increasing in height.

[0043] To avoid the impact of the repositioned nail plate 41 on the support of the material plate, the present invention designs the following structure: (See attached diagram) Figure 4 , Figure 5 and Figure 6 The protective bowl 53 is provided with an auxiliary support component 54 for supporting the material plate. The auxiliary support component 54 includes a number of studs 541 that are threaded to the movable seat 52 and are evenly distributed in the circumference. The upper part of the studs 541 is provided with rolling balls 542. The upper part of the rolling balls 542 protrudes from the upper surface of the movable seat 52 and is flush with the upper side of the nail plate 41 that has not moved down, so that the rolling balls 542 provide rolling support to the lower side of the material plate.

[0044] Screw 541 into the movable seat 52, so that the ball bearing 542, which can roll freely at the upper end of the screw 541, is assembled on the upper part of the movable seat 52. During cutting, the movable seat 52 drives the ball bearing 542 to roll against the lower side of the material plate, thereby enabling the ball bearing 542 to provide auxiliary support for the cutting position of the material plate. In turn, the ball bearing 542 can replace the downward-moving nail plate 41 in time to provide auxiliary support for the cutting position of the material plate, ensuring that the material plate is always in a flat state.

[0045] See Figure 5 and Figure 6 A retaining ring 521 for shielding and protecting the ball 542 is detachably installed on the upper side of the movable seat 52. The upper side of the retaining ring 521 is lower than the upper side of the ball 542. The edge of the retaining ring 521 corresponding to the position of the ball 542 shields the ball 542 to prevent the flying residue during cutting from adhering to the ball 542 and affecting the smooth rolling of the ball 542. During cutting, the upper side of the retaining ring 521 does not contact the lower side of the material plate to prevent the retaining ring 521 from contacting the material plate. On the one hand, this prevents the retaining ring 521 from moving the material plate, and on the other hand, it prevents the retaining ring 521 from scratching the lower side of the material plate.

[0046] It is worth noting that the lower side of the retaining ring 521 spans the movable seat 52 and the protective bowl 53. When the retaining ring 521 is connected to the movable seat 52, the retaining ring 521 can also block the position of the protective bowl 53, thereby ensuring that the protective bowl 53 can be stably placed inside the movable seat 52.

[0047] To effectively utilize the protective gas blown downwards during cutting and prevent strong turbulence from forming in the protective bowl 53, which could cause residue to be carried out of the protective bowl 53, this invention designs the following structure to enhance the residue collection effect of the protective bowl 53 using the protective gas: (See attached diagram) Figure 5 , Figure 6 , Figure 7 and Figure 8 A return air pipe 522 is fixedly installed on the movable seat 52 at equal intervals along its circumference. The return air pipe 522 is staggered with the ball bearing 542. The lower part of the protective bowl 53 has a guide hole that communicates with the inside and outside. The air inlet at the lower end of the return air pipe 522 receives part of the gas discharged from the guide hole and then guides it to the upper inner side of the baffle ring 521 through the upper outlet of the return air pipe 522. The bottom wall of the protective bowl 53 has a conical structure with the center raised upward. There is a gap between the guide hole of the protective bowl 53 and the lower air inlet of the return air pipe 522.

[0048] When the protective gas blowing downwards carries the hot residue into the protective bowl 53, the airflow passes through the asbestos mesh 531 and moves downwards, while the hot residue adheres to the asbestos mesh 531 and is collected. Subsequently, the downward impact airflow can be quickly and smoothly guided to the surrounding area along the conical structure of the bottom wall of the protective bowl 53, so that the airflow is smoothly guided to the air guide hole at the bottom of the protective bowl 53. Through this active guidance and regulation of the airflow inside the protective bowl 53, the generation of internal eddies and turbulence can be effectively avoided, ensuring that the sedimentation path of the residue is not disturbed, thereby ensuring the continuous and stable collection effect of the protective bowl 53 on the residue, and further reducing the possibility of the residue adhering to the nail plate 41 and causing its height to increase.

[0049] Subsequently, a portion of the airflow flowing out of the air guide hole flows to the lower air inlet of the return air pipe 522, and is then redirected from the upper outlet through the return air pipe 522 back to the inner area of ​​the upper end of the baffle ring 521. This airflow circulation design creates a stable positive pressure environment in the upper edge area of ​​the protective bowl 53, effectively suppressing the phenomenon of residues being blown upwards and escaping due to airflow turbulence inside the protective bowl 53, thereby significantly improving the collection effect and reliability of the protective bowl 53 for residues.

[0050] It should be emphasized that, because the protective gas moves downwards along the axis of the laser beam, it impacts downwards along the axial region of the protective bowl 53. Furthermore, because there is a gap between the gas guide hole of the protective bowl 53 and the lower air inlet of the return gas pipe 522, such as... Figure 7 As shown, this ensures that most of the downward-impacting airflow flows to the outside, with only a small portion flowing to the lower air inlet of the return air pipe 522. This guarantees the overall flow of the protective gas as it impacts downward along the axial region of the protective bowl 53, preventing obstructed airflow at the bottom of the protective bowl 53 and causing the downward-impacting airflow to bend back upward along the edge of the protective bowl 53.

[0051] The location of the return air pipe 522 and the shape of the protective bowl 53 in this embodiment were obtained through repeated experiments by those skilled in the art, which can achieve stable guidance of the protective airflow and effective collection of residue.

[0052] Although the invention incorporates a protective bowl 53, an explosion-proof motor 513, and a ball bearing 542, which increases costs, these investments yield substantial returns by significantly improving the overall performance and long-term economic efficiency of the equipment. Specifically, through the protective bowl 53's shielding and cutting protection, residue collection, and the auxiliary support component 54's support of the material plate in the aforementioned structure, the cutting operation is performed, resulting in a significant extension of the maintenance cycle and reducing frequent downtime caused by replacing damaged nail plates 41 and cleaning adhering residue. At the same time, by ensuring the long-term flatness and precise avoidance of the support plane, the cutting accuracy and yield are effectively improved, and scrap loss is reduced. Its automated operation mode also reduces reliance on operators and the frequency of manual intervention.

[0053] In summary, despite a slight increase in initial costs, this invention, taking into account equipment lifespan, production efficiency, and processing quality, results in a decrease in overall ownership and usage costs, demonstrating excellent practicality and market competitiveness.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first," "second," "number one," and "number two" are used 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," "number one," or "number two" may explicitly or implicitly include at least one 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.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A numerically controlled laser cutting machine comprising a base, on the upper side of which a laser is arranged, which is controlled in movement by a drive assembly, characterized in that, The base upper side is provided with a support mechanism for flexible support of the material plate, and the driving assembly is provided with a protection mechanism for protection of the support mechanism; The support mechanism comprises a plurality of pin plates arranged at equal intervals left and right, which are slidably connected to the base up and down and are used for main support of the material plate, and a lifting assembly for driving the pin plates; The protection mechanism comprises a moving seat connected to the lower part of the driving assembly through a synchronous assembly, the lifting assembly automatically moves downward to avoid the moving seat, a high-temperature-resistant protection bowl is detachably arranged in the moving seat, the synchronous assembly drives the protection bowl to move with the laser through the moving seat, so that the protection bowl is always located at the coaxial position below the laser, and an auxiliary support assembly is arranged on the protection bowl for auxiliary support of the material plate; When the laser moves for cutting, the protection bowl follows the laser beam to dynamically shield the pin plate to collect residues and prevent residues from splashing and adhering to the pin plate, and the pin plate automatically moves downward to prevent the cutting pin plate, thereby enabling the pin plate to stably support the material plate for a long time without manual intervention.

2. A numerically controlled laser cutting machine according to claim 1, wherein, The lifting assembly comprises an explosion-proof electric cylinder fixedly installed on the base and corresponding to the pin plate.

3. A numerically controlled laser cutting machine according to claim 1, wherein, The driving assembly comprises a track frame slidably arranged on the base left and right, and the track frame is slidably connected to the laser front and back.

4. A numerically controlled laser cutting machine according to claim 3, wherein, The synchronous assembly comprises a fixed frame fixedly installed on the track frame, and the moving seat is slidably connected to the fixed frame front and back, and the upper side of the moving seat is lower than the upper side of the pin plate which is not moved downward.

5. A numerically controlled laser cutting machine according to claim 4, wherein, The fixed frame is provided with a lead screw screwed with the moving seat, and an explosion-proof motor is fixedly installed on the front side of the fixed frame for driving the lead screw to rotate.

6. A CNC laser cutting machine as claimed in claim 1, wherein, The auxiliary support assembly comprises a plurality of threaded studs screwed to the moving seat and arranged at equal intervals in the circumferential direction, and a plurality of rolling balls are arranged on the upper part of the threaded studs.

7. A numerically controlled laser cutting machine according to claim 6, wherein, A shielding ring is detachably installed on the upper side of the moving seat for shielding and protecting the rolling balls, and the upper side of the shielding ring is lower than the upper side of the rolling balls.

8. A numerically controlled laser cutting machine according to claim 7, wherein, A gas return pipeline is fixedly installed on the moving seat at equal intervals in the circumferential direction, the gas return pipeline is arranged in a staggered manner with the rolling balls, the protection bowl is provided with a gas guide hole communicating with the inside and outside, and the lower end gas inlet of the gas return pipeline receives part of the gas discharged from the gas guide hole and then guides the gas to the inner side of the upper end of the shielding ring through the upper end outlet of the gas return pipeline.

9. A numerically controlled laser cutting machine according to claim 8, wherein, The bottom wall of the protection bowl is in a conical structure with a center upward protrusion, and there is a gap between the gas guide hole of the protection bowl and the lower end gas inlet of the gas return pipeline.

10. A CNC laser cutting machine as claimed in claim 1, wherein, A asbestos net is detachably installed in the middle of the inner side of the protection bowl, and the protection bowl is made of high-temperature-resistant ceramic material.

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