Novel plate laser cutting machine

Abstract

The invention discloses a novel plate laser cutting machine, and particularly relates to the field of laser cutting, the novel plate laser cutting machine comprises a machine body, a plate supporting mechanism is arranged on the machine body, the plate supporting mechanism comprises a plurality of cutter strips arranged in a linear array, and the plurality of cutter strips are used for supporting a plate; a clamping and stretching mechanism is further arranged on the machine body, the clamping and stretching mechanism comprises at least two clamping assemblies and a stretching assembly, the clamping assemblies are used for clamping the opposite edges of the plate correspondingly, and the stretching assembly is used for driving the two corresponding clamping assemblies to do synchronous and incongruous linear motion. According to the laser cutting device, the clamping and stretching mechanism is arranged, in the laser cutting process, edge clamping and stretching are carried out on a plate, so that uniform tensile stress generated through stretching can resist warping caused by gravity drooping and local thermal stress of the plate, the plate is always in a tensioning state before cutting and in the cutting process, and the cutting quality of the plate is improved. And micro-vibration caused by high-speed movement or gas impact can be effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and more specifically, to a novel laser cutting machine for sheet metal. Background Technology

[0002] Laser cutting is a processing technology that uses a high-power-density laser beam to irradiate the material being cut, rapidly heating it to its vaporization or melting temperature to achieve separation. It generates a laser beam, which is then focused into a tiny spot by an optical lens system. This high-energy-density spot irradiates the material surface, instantly heating it to its melting point (melting) or boiling point (vaporization). A high-speed airflow coaxial with the laser beam blows away the molten or vaporized material. As the laser head moves relative to the material, a continuous kerf is formed, thus completing the cutting process.

[0003] Currently, when laser cutting sheet metal, blades are typically used to support the sheet metal. These blades are part of a specialized worktable designed to ensure high-precision cutting. They are supported by densely and evenly arranged blades, minimizing the contact area with the sheet metal while ensuring sufficient support strength. This prevents the laser from reflecting off the support and burning the bottom of the sheet metal. However, when laser cutting thinner sheet metal that is also large in size, the sheet metal is prone to elastic sagging in the suspended area between the blades under its own weight or thermal stress. This results in a non-perpendicular cut surface, affecting the cutting quality. At the same time, the lack of rigid support at the edges of the sheet metal makes it prone to micro-vibrations under the high-speed movement of the laser head or the impact of auxiliary gas, which also affects the quality of the laser cutting. Summary of the Invention

[0004] The present invention provides a novel laser cutting machine for sheet metal, which aims to solve the following problem: When performing laser cutting on thin sheet metal with large dimensions, the thin sheet metal is prone to elastic sagging in the suspended area between the blades under its own weight or thermal stress, resulting in a non-perpendicular cutting surface and affecting the cutting quality. At the same time, the edges of the sheet metal lack rigid support, and are prone to micro-vibration under the high-speed movement of the laser head or the impact of auxiliary gas, which also affects the laser cutting quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel laser cutting machine for sheet metal, comprising: a machine body, on which a sheet metal support mechanism is provided, the sheet metal support mechanism comprising a plurality of blades arranged in a linear array, the plurality of blades being used to support the sheet metal; The machine body is also equipped with a clamping and stretching mechanism, which includes a clamping component and a stretching component. The clamping component includes at least two components for clamping the opposite edges of the plate respectively. The stretching component is used to drive the corresponding two clamping components to perform synchronous and opposite linear motion to apply in-plane tensile force to the clamped plate. The machine body is also equipped with a laser cutting mechanism, which includes a laser cutting head located on the top of the machine body. The laser cutting head is used to laser cut the sheet material.

[0006] In a preferred embodiment, the plate support mechanism further includes a blade positioning assembly, which includes two blade seats and one blade holder. The blade seats are located on both sides of the top of the machine body, and the blade holder is located in the middle of the top of the machine body. The blade seats and blade holder are used to support and position the blades.

[0007] In a preferred embodiment, the clamping assembly includes two clamping bars that clamp the edge of the plate material through synchronous and opposite movements.

[0008] In a preferred embodiment, the clamping assembly further includes a connecting seat, which is disposed on the blade holder. A drive component is disposed on the connecting seat, and a connecting shaft is installed at the output end of the drive component. A chuck is fixedly disposed at the end of the connecting shaft. A wedge groove is formed in the connecting seat, and two wedge blocks are slidably disposed in the wedge groove. A guide component is also disposed on the connecting seat to guide the two wedge blocks. A slot is formed on one side of each of the two wedge blocks, and the chuck is movably disposed in the slot. The two clamping bars are fixedly connected to the corresponding wedge blocks respectively.

[0009] In a preferred embodiment, the guide assembly includes two guide grooves formed on the connecting seat, and guide shafts are fixedly provided on both wedge blocks, with the two guide shafts slidably disposed in the corresponding guide grooves.

[0010] In a preferred embodiment, the stretching assembly includes a rotating disk rotatably disposed within a blade holder, two dials fixedly disposed on the rotating disk, and a rectangular frame movably sleeved on each of the two dials. A connecting rod is fixedly disposed on each of the two rectangular frames, and the two connecting rods are fixedly connected to corresponding connecting seats.

[0011] In a preferred embodiment, a cooling mechanism is provided inside the machine body. The cooling mechanism includes multiple fixed strips fixedly disposed inside the machine body. A blade is inserted and installed at the top of the fixed strip. A through-hole is opened inside the fixed strip, and through holes communicating with the through-hole are opened at both ends of the fixed strip. The bottom ends of the multiple fixed strips are fixedly connected to the same connecting pipe. An air inlet component is connected to the air inlet end of the connecting pipe. An air delivery hole is opened at the bottom end of the blade, and the air delivery hole is connected to the through-hole through the through-hole. Air outlet holes communicating with the air delivery holes are opened on both sides of the top of the blade. The air outlet ends of the air outlets point to the corresponding contact point between the blade and the plate.

[0012] In a preferred embodiment, the top end of the fixing strip is provided with a mounting groove, and a sealing element is provided in the mounting groove. The blade is movably inserted into the mounting groove and sealed by the sealing element.

[0013] In a preferred embodiment, the machine body is further provided with a slag scraping mechanism, which includes scraper bars that are slidably disposed on both sides of the blade bar, and a second driving component is installed at the bottom of the blade bar seat. A lifting plate is installed at the output end of the second driving component, and the lifting plate is slidably disposed in the blade bar seat. A horizontal bar is fixedly disposed on the side of the lifting plate, and the horizontal bar extends out of the blade bar seat and is fixedly disposed with a connecting plate. The scraper bars are fixedly connected to the corresponding connecting plates.

[0014] In a preferred embodiment, the laser cutting mechanism further includes a linear drive component 1 disposed on the machine body, a linear drive component 2 disposed at the output end of the linear drive component 1, and a laser cutting head mounted at the output end of the linear drive component 2. Both the linear drive component 1 and the linear drive component 2 are used to drive the laser cutting head to move linearly.

[0015] The beneficial effects of this invention are as follows: This invention, by setting up a clamping and stretching mechanism, clamps and stretches the plate at the edges during laser cutting. The uniform tensile stress generated by the stretching can resist the sagging caused by the plate's own gravity and the warping caused by local thermal stress, keeping the plate in a taut state before and during cutting. This effectively suppresses micro-vibrations caused by high-speed movement or gas impact.

[0016] This invention incorporates a cooling mechanism that blows cold air at the contact point between the blade and the sheet material during laser cutting, thus preventing thin and large sheets from being easily burned or deformed during the laser cutting process.

[0017] This invention utilizes a clamping and stretching mechanism in conjunction with a cooling mechanism. By clamping and stretching the sheet metal to flatten it, the cooling mechanism ensures that the cold air is precisely directed to the contact point between the blade and the sheet metal during the air-blowing cooling process. This prevents the problem of cold air not reaching the contact point due to the thinness of the sheet metal causing collapse or warping. Furthermore, targeted air-blowing cooling reduces heat accumulation and thermal gradient in the cutting area of ​​the sheet metal, thereby significantly reducing the warping tendency caused by thermal stress. This avoids thermal deformation of the sheet metal caused by the heat generated during laser cutting, preventing interference between thermal deformation and the sheet metal's planar stretching, and further ensuring the cutting quality. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the clamping and stretching mechanism of the present invention; Figure 3 This is a cross-sectional view of the clamping and stretching mechanism of the present invention; Figure 4 This is a side sectional view of the present invention. Figure 5 This is a schematic diagram of the structure of the stretching component of the present invention; Figure 6 This is a side sectional view of a portion of the structure of the present invention; Figure 7 for Figure 6 Enlarged view of section A; Figure 8 This is a schematic diagram of the front cross-sectional view of the slag scraping mechanism of the present invention; Figure 9 This is a side cross-sectional view of the slag scraping mechanism of the present invention.

[0019] The attached figures are labeled as follows: 1. Machine body; 2. Sheet metal support mechanism; 21. Blade positioning assembly; 211. Blade holder; 212. Blade frame; 22. Blade; 221. Air inlet; 222. Air outlet; 3. Clamping and stretching mechanism; 31. Clamping assembly; 311. Clamping bar; 312. Connecting seat; 3121. Wedge groove; 313. Drive component one; 314. Connecting shaft; 315. Chuck; 316. Wedge block; 3161. Slot; 317. Guide assembly; 3171. Guide. 3172, guide shaft; 32, tensioning assembly; 321, rotary disk; 322, dial shaft; 323, rectangular frame; 324, connecting rod; 4, cooling mechanism; 41, fixing strip; 411, through port; 42, through hole; 43, connecting pipe; 5, slag scraping mechanism; 51, scraper; 52, driving component two; 53, lifting plate; 54, crossbar; 55, connecting plate; 6, laser cutting mechanism; 61, linear drive assembly one; 62, linear drive assembly two; 63, laser cutting head. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Refer to the instruction manual appendix Figure 1 , Figure 2 A novel laser cutting machine for sheet metal includes: a machine body 1, a sheet metal support mechanism 2 provided on the machine body 1, the sheet metal support mechanism 2 including multiple blades 22 arranged in a linear array, the multiple blades 22 being used to support the sheet metal; The body 1 is also provided with a clamping and stretching mechanism 3. The clamping and stretching mechanism 3 includes a clamping component 31 and a stretching component 32. The clamping component 31 includes at least two components for clamping the opposite edges of the plate respectively. The stretching component 32 is used to drive the corresponding two clamping components 31 to perform synchronous and opposite linear motion, and apply in-plane stretching force to the clamped plate. The machine body 1 is also equipped with a laser cutting mechanism 6, which includes a laser cutting head 63 located above the machine body 1. The laser cutting head 63 is used to laser cut the sheet material.

[0022] It should be noted that the clamping component 31 includes two clamping bars 311. The two clamping bars 311 clamp the edge of the plate through synchronous and opposite movements. The clamping component 31 includes two components, and the two clamping components 31 can clamp the two sides of the plate respectively.

[0023] In this embodiment, the specific implementation scenario is as follows: First, the plate is placed on the blade 22 to support it. Then, the two sides of the plate are clamped and fixed by two clamping components 31. Subsequently, the two clamping components 31 are driven to move synchronously and in opposite directions by the stretching component 32, so that the two clamping components 31 apply in-plane tensile force to the plate during the synchronous and opposite-direction movement. Then, the plate is laser-cut by the laser cutting head 63. During the cutting process, due to the edge clamping and stretching of the plate, the uniform tensile stress generated by the stretching can resist the sagging of the plate due to its own gravity and the warping caused by local thermal stress, so that the plate is always in a tensile state before and during the cutting process, which can effectively suppress the micro-vibration caused by high-speed movement or gas impact.

[0024] Further, please refer to the appendix to the instruction manual. Figure 1 The plate support mechanism 2 also includes a blade positioning assembly 21, which includes two blade seats 211 and a blade holder 212. The blade seats 211 are located on the top sides of the machine body 1, and the blade holder 212 is located in the middle of the top of the machine body 1. The blade seats 211 and the blade holder 212 are used to support and position the blade 22.

[0025] It should be noted that by using two blade holders 211 and one blade support 212 to support the blade 22, the absolute flatness and height of the support plane are ensured, so that the tips of the blade teeth of each blade 22 are in the same precise plane. Furthermore, the blade 22 can be fixed to the blade holder 211 or the blade support 212 with bolts, making the blade 22 detachable and replaceable. This allows the blade 22 to be disassembled and replaced after the tips of the blade teeth have been subjected to long-term loading and unloading of plates, thermal cycling and slight impacts, thus avoiding affecting the support accuracy.

[0026] Further, please refer to the appendix to the instruction manual. Figure 2 , Figure 3The clamping assembly 31 also includes a connecting seat 312, which is mounted on the tool holder 211. A drive component 313 is mounted on the connecting seat 312, and a connecting shaft 314 is mounted on the output end of the drive component 313. A chuck 315 is fixedly mounted on the end of the connecting shaft 314. A wedge-shaped groove 3121 is formed inside the connecting seat 312, and two wedge-shaped blocks 316 are slidably disposed within the wedge groove 3121. A guide assembly 317 is also provided on the connecting seat 312 for... Two wedge blocks 316 are guided. Each of the two wedge blocks 316 has a slot 3161 on one side. A chuck 315 is movably disposed in the slot 3161. Two clamping bars 311 are fixedly connected to the corresponding wedge blocks 316. The guide assembly 317 includes two guide grooves 3171 on the connecting seat 312. Guide shafts 3172 are fixedly disposed on each of the two wedge blocks 316. The two guide shafts 3172 are slidably disposed in the corresponding guide grooves 3171.

[0027] It should be noted that the connecting seat 312 can be a cylinder. Before cutting the plate, the plate is placed on the blade 22, and then the cylinder drives the connecting shaft 314 to drive the chuck 315 to move. This causes the chuck 315 to push the two wedge blocks 316 towards the plate. At the same time, the shape of the wedge blocks 316, the wedge groove 3121, and the guide groove 3171 guide the two wedge blocks 316, so that the two wedge blocks 316 can move closer to each other. This, in turn, drives the two clamping bars 311 to clamp and fix the edge of the plate.

[0028] Further, please refer to the appendix to the instruction manual. Figure 4 , Figure 5 The stretching assembly 32 includes a rotating disk 321 rotatably disposed within the blade holder 211. Two pivot shafts 322 are fixedly disposed on the rotating disk 321, and rectangular frames 323 are movably sleeved on each of the two pivot shafts 322. Connecting rods 324 are fixedly disposed on each of the two rectangular frames 323, and the two connecting rods 324 are fixedly connected to the corresponding connecting seats 312.

[0029] It should be noted that the rotating disk 321 can be driven to rotate by a motor. During the rotation of the rotating disk 321, the two rectangular frames 323 can be moved synchronously in opposite directions by the two pivot shafts 322. This, in turn, can drive the two connecting seats 312 to move in opposite directions by the two connecting rods 324. At this time, the two clamping components 31 have clamped the two sides of the plate. Thus, the synchronous opposite movement of the two connecting seats 312 can achieve planar stretching of the plate. By applying a lateral tensile force to the edges, the plate is kept in a tensile state before and during cutting. This can effectively suppress micro-vibrations caused by high-speed movement or gas impact. Furthermore, the uniform tensile stress generated by stretching can resist the sagging caused by the plate's own gravity and warping caused by local thermal stress, making the cutting plane more stable, ensuring the perpendicularity and dimensional accuracy of the cutting surface, and improving the cutting quality.

[0030] However, in the above technical solution, by setting up the clamping and stretching mechanism 3 to clamp and stretch the thin plate before cutting the thin and large plate, the thin plate is in a tensile state during cutting, making the cutting plane more stable, ensuring the perpendicularity and dimensional accuracy of the cutting surface, and improving the cutting quality. However, for laser cutting of thin and large plates, the heat input per unit time is approximately constant. For thin plates, their mass is very small, so under the same heat input, the temperature rise of the thin plate will be much greater than that of the thick plate. At the same time, the distance in the thickness direction of the thin plate is extremely short, and the time required for heat to be conducted from the top to the bottom is very short. With minimal resistance, the heat from the laser input reaches the bottom of the thin plate almost unimpeded. However, since the bottom is typically exposed to air, and air has very poor thermal conductivity, the heat accumulates there and dissipates slowly. Consequently, the high temperature generated during cutting is rapidly conducted through the minimal contact point between the blade 22 and the plate, easily leading to burns or thermal deformation protrusions on the back of the contact point. Therefore, this invention also proposes a cooling mechanism 4 to blow cold air onto the contact point between the blade 22 and the plate during laser cutting to reduce temperature and prevent thermal deformation caused by high temperatures. For details, please refer to the appendix of the specification. Figure 6 , Figure 7The machine body 1 is equipped with a cooling mechanism 4, which includes multiple fixing strips 41 fixedly installed inside the machine body 1. The blade 22 is inserted and installed at the top of the fixing strip 41. The fixing strip 41 has an opening 411, and both ends of the fixing strip 41 have through holes 42 that communicate with the opening 411. The bottom ends of the multiple fixing strips 41 are fixedly connected to the same connecting pipe 43. The air inlet end of the connecting pipe 43 is connected to an air inlet component. The bottom end of the blade 22 has an air supply hole 221, which communicates with the opening 411 through the through hole 42. The top of both sides of the blade 22 has an air outlet hole 222 that communicates with the air supply hole 221. The air outlet end of the air outlet hole 222 points to the contact point between the corresponding blade 22 and the plate. The top end of the fixing strip 41 has an installation groove, and a sealing element is provided in the installation groove. The blade 22 is movably inserted into the installation groove and sealed by the sealing element.

[0031] It should be noted that the air intake component can be an air pump, and the air intake end of the air pump can be connected to cooling air. During the laser cutting process, the air pump draws in cold air and delivers it to the connecting pipe 43, and then delivers it from the connecting pipe 43 to multiple fixed strips 41. It is then delivered to the corresponding air supply holes 221 through the corresponding openings 411 and through holes 42, and finally sprayed out through multiple air outlets 222, and sprayed towards the contact point between the corresponding blade 22 and the plate, thereby achieving cooling during the laser cutting process and avoiding the problem of thermal burns or thermal deformation that easily occur in thin and large plates during the laser cutting process.

[0032] It should also be noted that by using the clamping and stretching mechanism 3 to clamp and flatten the sheet metal, the cooling mechanism 4 can more accurately blow cold air to the contact point between the blade 22 and the sheet metal during the air-blowing cooling process. This prevents the sheet metal from collapsing or warping due to its thinness, thus avoiding the problem of cold air not being able to reach the contact point. Furthermore, by using fixed-point air-blowing cooling, the heat accumulation and heat gradient in the cutting area of ​​the sheet metal can be reduced, thereby significantly reducing the warping tendency caused by thermal stress. This can prevent the heat generated during laser cutting from causing thermal deformation of the sheet metal, which would lead to interference between thermal deformation and the flat stretching of the sheet metal, and can further ensure its cutting quality.

[0033] In the above technical solution, the clamping and stretching mechanism 3 and the cooling mechanism 4 are combined to ensure the cutting quality of thin and large plates during laser cutting. However, during laser cutting, slag is usually generated, and the slag will splash and adhere to the side of the blade 22. In addition, the slag may also adhere to the position of the vent 222, which can easily affect the cooling airflow. To address this, the present invention also proposes a slag scraping mechanism 5, as detailed in the appendix of the specification. Figure 8 , Figure 9The machine body 1 is also equipped with a slag scraping mechanism 5. The slag scraping mechanism 5 includes scraper bars 51 that are slidably disposed on both sides of the blade bar 22. A second drive component 52 is installed at the bottom of the blade bar seat 211. A lifting plate 53 is installed at the output end of the second drive component 52. The lifting plate 53 is slidably disposed in the blade bar seat 211. A horizontal bar 54 is fixedly disposed on the side of the lifting plate 53. The horizontal bar 54 extends to the outside of the blade bar seat 211 and is fixedly disposed with a connecting plate 55. The scraper bars 51 are fixedly connected to the corresponding connecting plates 55.

[0034] It should be noted that the second driving component 52 can be a cylinder, which drives the lifting plate 53 to move linearly, so that it can drive the corresponding scraper 51 to move vertically linearly through the horizontal bar 54 and the connecting plate 55. This allows the molten slag on both sides of the blade 22 to be scraped and cleaned after laser cutting, avoiding the problem of molten slag adhesion affecting cooling after long-term use.

[0035] Further, please refer to the appendix to the instruction manual. Figure 1 The laser cutting mechanism 6 also includes a linear drive assembly 61 mounted on the body 1. A linear drive assembly 62 is mounted on the output end of the linear drive assembly 61. The laser cutting head 63 is mounted on the output end of the linear drive assembly 62. Both the linear drive assembly 61 and the linear drive assembly 62 are used to drive the laser cutting head 63 to move linearly.

[0036] It should be noted that both linear drive assembly 61 and linear drive assembly 62 can be linear motors. Through the two linear motors, the laser cutting head 63 can be driven to move in both the horizontal and vertical directions for laser cutting.

[0037] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present 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 protection scope of the present invention.

Claims

1. A novel laser cutting machine for sheet metal, characterized in that, include: The machine body (1) is provided with a plate support mechanism (2), which includes multiple blades (22) arranged in a linear array, and the multiple blades (22) are used to support the plate. The body (1) is also provided with a clamping and stretching mechanism (3). The clamping and stretching mechanism (3) includes a clamping component (31) and a stretching component (32). The clamping component (31) includes at least two components, which are used to clamp the opposite edges of the plate respectively. The stretching component (32) is used to drive the corresponding two clamping components (31) to perform synchronous and opposite linear motion, and apply in-plane stretching force to the clamped plate. The machine body (1) is also provided with a laser cutting mechanism (6), which includes a laser cutting head (63) located above the machine body (1). The laser cutting head (63) is used to laser cut the plate.

2. The novel plate laser cutting machine according to claim 1, characterized in that: The plate support mechanism (2) further includes a blade positioning assembly (21), which includes two blade seats (211) and a blade holder (212). The blade seats (211) are located on the top sides of the machine body (1), and the blade holder (212) is located in the middle of the top of the machine body (1). The blade seats (211) and the blade holder (212) are used to support and position the blade (22).

3. A novel laser cutting machine for sheet metal according to claim 2, characterized in that: The clamping assembly (31) includes two clamping bars (311), which clamp the edge of the plate through synchronous and opposite movements.

4. A novel laser cutting machine for sheet metal according to claim 3, characterized in that: The clamping assembly (31) further includes a connecting seat (312), which is disposed on the blade holder (211). A drive component (313) is disposed on the connecting seat (312). A connecting shaft (314) is installed at the output end of the drive component (313). A chuck (315) is fixedly disposed at the end of the connecting shaft (314). A wedge groove (3121) is provided in the connecting seat (312). Two wedge blocks (316) are slidably disposed in the wedge groove (3121). A guide assembly (317) is also provided on the connecting seat (312). The guide assembly (317) is used to guide the two wedge blocks (316). A slot (3161) is provided on one side of each of the two wedge blocks (316). The chuck (315) is movably disposed in the slot (3161). The two clamping bars (311) are fixedly connected to the corresponding wedge blocks (316).

5. A novel sheet metal laser cutting machine according to claim 4, characterized in that: The guide assembly (317) includes two guide grooves (3171) formed on the connecting seat (312), and guide shafts (3172) are fixedly provided on both wedge blocks (316), and the two guide shafts (3172) are slidably arranged in the corresponding guide grooves (3171).

6. A novel laser cutting machine for sheet metal according to claim 5, characterized in that: The stretching assembly (32) includes a rotating disk (321) rotatably disposed in the blade holder (211). Two pivot shafts (322) are fixedly disposed on the rotating disk (321), and rectangular frames (323) are movably sleeved on both pivot shafts (322). Connecting rods (324) are fixedly disposed on both rectangular frames (323), and the two connecting rods (324) are fixedly connected to the corresponding connecting seats (312).

7. A novel laser cutting machine for sheet metal according to claim 6, characterized in that: The machine body (1) is provided with a cooling mechanism (4). The cooling mechanism (4) includes multiple fixed strips (41) fixedly installed in the machine body (1). The blade (22) is inserted and installed at the top of the fixed strip (41). The fixed strip (41) has an opening (411) and both ends of the fixed strip (41) have through holes (42) connected to the opening (411). The bottom ends of the multiple fixed strips (41) are fixedly connected to the same connecting pipe (43). The air inlet end of the connecting pipe (43) is connected to an air inlet component. The bottom end of the blade (22) has an air delivery hole (221). The air delivery hole (221) is connected to the opening (411) through the through hole (42). Both sides of the blade (22) have an air outlet hole (222) connected to the air delivery hole (221). The air outlet end of the air outlet hole (222) points to the contact point between the corresponding blade (22) and the plate.

8. A novel laser cutting machine for sheet metal according to claim 7, characterized in that: The top end of the fixing strip (41) is provided with an installation groove, and a sealing element is provided in the installation groove. The blade (22) is movably inserted into the installation groove and sealed by the sealing element.

9. A novel plate laser cutting machine according to claim 8, characterized in that: The machine body (1) is also provided with a slag scraping mechanism (5). The slag scraping mechanism (5) includes scraper bars (51) that are slidably disposed on both sides of the blade bar (22). A second driving component (52) is installed at the bottom of the blade bar seat (211). A lifting plate (53) is installed at the output end of the second driving component (52). The lifting plate (53) is slidably disposed in the blade bar seat (211). A horizontal bar (54) is fixedly disposed on the side of the lifting plate (53). The horizontal bar (54) extends to the outside of the blade bar seat (211) and is fixedly disposed with a connecting plate (55). The scraper bar (51) is fixedly connected to the corresponding connecting plate (55).

10. A novel laser cutting machine for sheet metal according to claim 9, characterized in that: The laser cutting mechanism (6) further includes a linear drive component one (61) disposed on the body (1), and a linear drive component two (62) disposed at the output end of the linear drive component one (61). The laser cutting head (63) is installed at the output end of the linear drive component two (62). Both the linear drive component one (61) and the linear drive component two (62) are used to drive the laser cutting head (63) to move linearly.

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