Laser cutting device and cutting method for metal machining and manufacturing

Abstract

The invention discloses a laser cutting device for metal machining and manufacturing and a cutting method.The laser cutting device comprises a workbench, a left supporting frame and a right supporting frame, the left supporting frame and the right supporting frame are connected to the left side and the right side of the workbench correspondingly, and the lower end of a laser cutting head penetrates through the interior of the upper surface of a shielding protection frame installed above the workbench; fixing sleeves are symmetrically installed in a cylindrical shielding protection frame, a cleaning plate used for assisting in removing impurities is connected to the lower portions of the fixing sleeves, and automatic regulation and control assemblies used for controlling the cleaning plate to ascend and descend in a reciprocating mode are symmetrically installed on the outer side of the shielding protection frame. According to the laser cutting device for metal machining and manufacturing and the cutting method, two sets of cleaning plates are used in cooperation, slag and chippings adhering to the outer side face of a metal workpiece can be removed, and therefore the slag discharging effect is improved, slag adhering and fusion tumors are prevented from being generated on the surface of the metal workpiece in the later period, and therefore the later cutting operation cannot be affected; and meanwhile, the quality of the metal workpiece cut in the later period is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and in particular to a laser cutting device and a cutting method for metal processing and manufacturing. Background Art

[0002] The laser cutting device performs cutting operations through a laser beam. During the cutting process, the laser beam does not directly contact the metal material. Therefore, compared with the traditional cutting device, the laser cutting device will not have problems such as tool wear and material deformation. This makes the laser cutting device suitable for processing metal materials of various hardness and shapes. For example, laser cutting devices are required for processing bearings, stainless steel round bars and other metals. The patent name disclosed in the announcement number "CN111906458B" in the prior art is "A laser cutting machine for separating and processing metal pipe fittings", which discloses that the cutting frame is symmetrically arranged at the upper end of the base, a guide column is arranged on the left side of the inner end of the cutting frame, and a feed screw is arranged on the right side of the inner end of the cutting frame through a bearing, and a rotating motor is arranged at the rear end of the cutting frame located at the rear side through a motor bracket, an incomplete gear is arranged at the left end of the output end of the rotating motor, and a rotating gear is arranged at the right end of the feed screw. The rotating gear is connected to the incomplete gear by meshing, the moving frame is connected to the guide column by sliding, and the moving frame is connected to the moving frame by threaded connection. A laser cutting head is arranged at the lower end of the moving frame, and a feeding trough is opened at the upper end of the base. The rotating motor drives the rotating gear to rotate through the incomplete gear interval, so that the feed screw drives the moving frame to feed at intervals. After the laser cutting head moves, it stays above the metal pipe, and the metal pipe completes the cutting by self-rotation. The laser cutting head feeds intermittently to cut multiple metal pipes, as well as the prior art announcement The patent name disclosed by "CN110977187B" is "a laser cutting device for metal products", which discloses welding a filter screen on the outer surface of a vertical rod and a horizontal rod, placing a metal product on the filter screen, and adjusting the height of the workbench according to the thickness specification of the metal product, that is, driving the piston rod to rise and fall through the cylinder, and at the same time, driving the entire workbench to rise and fall under the sliding action of the sliding sleeve on the outer surface of the sliding rod, and finally ensuring that the cutting nozzle is slightly higher than the top of the metal product. According to actual cutting requirements, condensed water is injected into the water cooling chamber, and the focal length adjustment disk is rotated according to the thickness of the metal product for focusing. At this time, the entire laser cutting equipment can be started, and the cutting nozzle uses a high-power density focused laser beam to scan the metal product, heat the metal product to a certain temperature in a very short time and melt or vaporize it instantly, and then use high-pressure gas to blow away the molten or vaporized material from the cutting seam, and at the same time, under the sliding action of the guide rail and the sliding cover, the entire machine head is driven to move, and the metal product is cut at different positions in the horizontal direction; Although the laser cutting device in the above-mentioned prior art can blow away the molten or vaporized material from the cut by high-pressure gas when in use, some slag and debris may adhere to the surface of the metal workpiece. At this time, the slag and debris cannot be removed by high-pressure gas alone, resulting in poor slag removal effect, which may cause slag and melt nodules on the surface of the metal workpiece in the later stage, thereby not only affecting the later cutting operation, but also may cause damage to the laser cutting head. Therefore, we propose a laser cutting device and cutting method for metal processing and manufacturing to solve the above-mentioned problems. Summary of the invention

[0003] The object of the present invention is to provide a laser cutting device and a cutting method for metal processing and manufacturing, so as to solve the problem proposed in the above background technology that the laser cutting devices currently on the market cannot remove slag and debris only by high-pressure gas, thus resulting in poor slag removal effect, which may cause slag and melt nodules on the surface of the metal workpiece in the later stage, thereby not only affecting the later cutting operation, but also may cause damage to the laser cutting head.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a laser cutting device for metal processing and manufacturing, comprising a workbench, and a left support frame and a right support frame respectively connected to the left and right sides of the workbench, a row of conveying rollers being installed through the top of the left support frame, a vertical plate being installed above the left side of the workbench, a three-jaw chuck assembly being rotatably connected inside the vertical plate, a laser cutting head being fixed on the right side above the vertical plate, the lower end of the laser cutting head being passed through the inside of the upper surface of a shielding and protective frame installed above the workbench, a fixed sleeve being symmetrically installed inside the cylindrical shielding and protective frame, a cleaning plate for assisting in removing impurities being connected below the fixed sleeve, and an automatic control component for controlling the reciprocating lifting and lowering of the cleaning plate being symmetrically installed on the outside of the shielding and protective frame.

[0005] Preferably, the front ends of a row of conveying rollers form a transmission structure through a sprocket assembly.

[0006] Preferably, a transmission gear is connected to the outer side of the three-jaw chuck assembly, and the bottom of the three-jaw chuck assembly is meshedly connected with a driving gear installed at the lower right side of the vertical plate.

[0007] Preferably, a circle of cross bars are installed at equal intervals on the right side of the three-jaw chuck assembly, and there is a distance between the right end of the cross bar and the lower end of the laser cutting head.

[0008] Preferably, the automatic control component includes an air storage bag symmetrically installed in a receiving groove opened on the outer side of the shielding protection frame, a limit plate is arranged above the air storage bag, a semicircular convex plate is integrally connected above the limit plate, the diameter of the convex plate is smaller than the length of the limit plate, the limit plate is slidably connected to the receiving groove, and the lower part of the left and right sides of the limit plate is connected to the inside of the receiving groove through a return spring; A connecting pipe is fixed below the air storage airbag; A cross bar is arranged on the outer side of the convex plate, and the convex plate forms a sliding structure with the shielding protection frame through the cross bar.

[0009] Preferably, the interior of the fixed sleeve is fitted and slidably connected with a piston body, and the lower end of the piston body is connected to the cleaning plate through a connecting assembly; The lower end of the connecting pipe penetrates the surface of the shielding protection frame and is inserted into the upper interior of the fixing sleeve.

[0010] Preferably, the connecting assembly includes screws, and the cleaning plate slides reciprocatingly up and down together with the piston body through the screws.

[0011] Preferably, the connecting assembly comprises a slide rod installed in a groove opened on the upper surface of the cleaning plate, a connecting spring is nested and connected to the outer side of one end of the slide rod, and the other end of the slide rod passes through the lower end of the piston body; A connecting plate is installed on the outer side of the cleaning plate, and the left side of the connecting plate is arranged in an arc shape; Two rows of bosses are symmetrically installed on the inner wall of the left side of the shielding protection frame. The right end of the boss is set in a semicircular shape. The distance between two adjacent bosses is greater than the height of the connecting plate. Bosses are set on the upper and lower parts of the left end of the connecting plate. The connecting plate forms a left-right reciprocating sliding structure through the bosses.

[0012] Preferably, a guide rail assembly is fixed on the top of the right support frame, and a movable plate is slidably connected on the top of the guide rail assembly. A cover plate is fixed on the left side of the movable plate, and the left side of the cover plate is fitted with the right side of the shielding and protection frame. A support plate arranged in an arc shape is fixed below the left side of the cover plate, and a filter plate is installed inside the support plate. The left end of the support plate is inserted into the shielding and protection frame, and the highest point of the support plate is lower than the horizontal center line position of the shielding and protection frame.

[0013] Another technical solution provided by the present invention is to provide a cutting method of a laser cutting device for metal processing and manufacturing, comprising the following steps: S1: The cylindrical metal workpiece is conveyed by the conveying roller, and then the metal workpiece is clamped by the three-jaw chuck assembly; S2: The three-jaw chuck assembly drives the metal workpiece to rotate, and then the laser cutting head performs the cutting operation; S3: The three-jaw chuck assembly drives the crossbar to rotate and squeeze the convex plate in turn, so that the gas in the air storage bag enters the fixed sleeve, and then automatically drives the cleaning plate to move up and down reciprocatingly to scrape and clean the impurities; S4: The cooperation between the convex column and the connecting plate can drive the cleaning plate to move up and down reciprocatingly and move left and right reciprocatingly to scrape and clean the impurities; S5: Finally, the moving plate is moved to the right to take out the cut metal workpiece on the filter plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the laser cutting device and cutting method for metal processing and manufacturing can remove the slag and debris adhered to the outer side of the metal workpiece by using two sets of cleaning plates in combination, thereby improving the slag removal effect, avoiding the generation of slag and molten nodules on the surface of the metal workpiece in the later stage, thereby not affecting the later cutting operation, and also improving the quality of the metal workpiece after the later cutting. The specific contents are as follows: (1) When the metal workpiece is rotating and being cut, the cleaning plate reciprocates up and down, so that the bottom surface of the cleaning plate intermittently contacts the side of the metal workpiece, and exerts a downward impact force on the side of the metal workpiece. Then, the two sets of cleaning plates are used together to remove the slag and debris adhering to the outer side of the metal workpiece, thereby improving the slag removal effect and avoiding the generation of slag and nodules on the surface of the metal workpiece in the later stage, which will not affect the later cutting operation and also improve the quality of the metal workpiece after the later cutting; When the three-jaw chuck assembly drives the metal workpiece to rotate and cut, the three-jaw chuck assembly drives a circle of cross bars to rotate, so that the circle of cross bars applies pressure to the convex plate in turn, so that the convex plate squeezes the air storage bag, so that the gas in the air storage bag enters the fixed sleeve, so that the piston body can drive the cleaning plate to move up and down reciprocatingly, without the need for an additional power source, and the structure is simple; (2) The cleaning plate is slidably connected to the piston body through a connecting assembly, so that the cleaning plate drives the connecting plate to move up and down reciprocatingly. Through the setting of the convex column, the connecting plate and the cleaning plate are automatically driven to move left and right reciprocatingly. Therefore, the cleaning plate moves up and down while moving left and right, thereby further improving the efficiency and quality of the cleaning plate in removing slag and debris adhered to the outer side of the metal workpiece; (3) The movable plate drives the cover plate to move to the right, so that the cover plate can pull the support plate out of the shielding and protection frame, thereby facilitating the cleaning of slag and debris in the shielding and protection frame and facilitating the removal of the cut metal workpiece on the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a left-side stereoscopic structural schematic diagram of the present invention; Figure 2 It is a right-side stereoscopic structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the movable plate of the present invention after it moves; Figure 4 This is a right view structural diagram of the connection between the shielding protection frame and the cover plate of the present invention; Figure 5 It is a right view structural schematic diagram of the three-jaw chuck assembly of the present invention; Figure 6 This is a schematic diagram of the right cross-sectional structure of the shielding protection frame of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle; Figure 8 This is a schematic diagram of the main cross-sectional structure of the shielding protection frame of the present invention; Fig. 9 This is a schematic diagram of the cross-sectional structure of the connection between the shielding protection frame and the convex plate of the present invention; Fig.10 For the present invention Fig. 9 The enlarged structural diagram at B in the middle; Fig.11 This is a schematic diagram of the cleaning plate of the present invention when viewed from above; Fig.12 It is a schematic diagram of the top view structure of the cleaning plate in the second embodiment of the present invention.

[0016] In the figure: 1. workbench; 2. left support frame; 3. conveyor roller; 4. sprocket assembly; 5. vertical plate; 6. laser cutting head; 7. shielding protection frame; 71. accommodating groove; 8. cover plate; 81. filter plate; 82. support plate; 9. movable plate; 10. right support frame; 11. guide rail assembly; 12. convex plate; 121. limit plate; 122. reset spring; 13. driving gear; 14. three-jaw chuck assembly; 15. cross bar; 16. transmission gear; 17. air storage bag; 171. connecting pipe; 18. fixed sleeve; 181. piston body; 19. cleaning plate; 191. slide rod; 192. connecting spring; 20. connecting plate; 21. convex column. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 12 , the present invention provides the following technical solutions: Embodiment 1: The laser cutting device for metal processing and manufacturing in this embodiment can improve the slag removal effect and avoid the generation of slag and molten nodules on the surface of the metal workpiece in the later stage. The specific structure is shown in the attached Figure 1-Figure 10 As shown, it includes a workbench 1, and a left support frame 2 and a right support frame 10 respectively connected to the left and right sides of the workbench 1, a row of conveying rollers 3 are installed on the top of the left support frame 2, a vertical plate 5 is installed on the upper left side of the workbench 1, and a three-jaw chuck assembly 14 is rotatably connected inside the vertical plate 5, a laser cutting head 6 is fixed on the upper right side of the vertical plate 5, and the lower end of the laser cutting head 6 passes through the upper surface of the shielding and protection frame 7 installed above the workbench 1, and a fixed sleeve 18 is symmetrically installed inside the cylindrical shielding and protection frame 7, and a cleaning plate 19 for assisting in removing impurities is connected below the fixed sleeve 18, and an automatic control assembly for controlling the reciprocating lifting of the cleaning plate 19 is symmetrically installed on the outer side of the shielding and protection frame 7, the front end of a row of conveying rollers 3 forms a transmission structure through a sprocket assembly 4, and a transmission gear 16 is connected to the outer side of the three-jaw chuck assembly 14, and the bottom of the three-jaw chuck assembly 14 is meshed and connected with the driving gear 13 installed on the lower right side of the vertical plate 5.

[0019] A circle of cross bars 15 are installed at equal intervals on the right side of the three-jaw chuck assembly 14, and there is a distance between the right end of the cross bar 15 and the lower end of the laser cutting head 6. The automatic control assembly includes an air storage bag 17 symmetrically installed in the receiving groove 71 opened on the outer side of the shielding protection frame 7, and a limit plate 121 is arranged above the air storage bag 17. A semicircular convex plate 12 is integrally connected to the upper part of the limit plate 121. The diameter of the convex plate 12 is smaller than the length of the limit plate 121. The limit plate 121 is slidably connected with the receiving groove 71, and the lower left and right sides of the limit plate 121 are connected by a return spring 1 22 is connected to the interior of the accommodating groove 71, a connecting pipe 171 is fixed at the bottom of the air storage bag 17, a cross bar 15 is arranged on the outer side of the convex plate 12, the convex plate 12 forms a sliding structure with the shielding protection frame 7 through the cross bar 15, the interior of the fixed sleeve 18 is fitted and slidably connected with the piston body 181, the lower end of the piston body 181 is connected to the cleaning plate 19 through a connecting assembly, the lower end of the connecting pipe 171 penetrates the surface of the shielding protection frame 7 and is inserted into the upper interior of the fixed sleeve 18, the connecting assembly includes screws, and the cleaning plate 19 slides reciprocatingly up and down together with the piston body 181 through the screws.

[0020] First, place the metal workpiece on the conveying roller 3 on the left support frame 2. At this time, the front end of one of the conveying rollers 3 is connected to the external motor through a coupling. The motor drives one of the conveying rollers 3 to rotate, and then one of the conveying rollers 3 drives the other three groups of conveying rollers 3 to rotate through the sprocket assembly 4, so that the four groups of conveying rollers 3 rotate at the same time to automatically convey the metal workpiece to the right, so that the right end of the metal workpiece passes through the interior of the vertical plate 5 and the three-jaw chuck assembly 14 and is inserted into the shielding protection frame 7, and then the metal workpiece is clamped by the three-jaw chuck assembly 14, and the motor in the vertical plate 5 is started to drive the active gear 13 to rotate, and the active gear 13 drives the transmission gear 16 to rotate, and the transmission gear 16 drives the three-jaw chuck assembly 14 and the metal workpiece to rotate, so that the cylindrical metal workpiece is rotated while being cut by the laser cutting head 6.

[0021] During the cutting process, the three-jaw chuck assembly 14 drives the multiple cross bars 15 arranged in a circle on the outside to rotate together. When the multiple cross bars 15 rotate, they will contact the convex plate 12 in turn. When one of the cross bars 15 contacts the convex plate 12, the cross bar 15 continues to rotate and move to apply a pressure to the convex plate 12, so that the semicircular convex plate 12 is squeezed into the accommodating groove 71. At this time, the convex plate 12 drives the limiting plate 121 on the bottom surface to move to squeeze the air storage bag 17 and the return spring 122. The return spring 122 accumulates force, and the gas in the air storage bag 17 enters the fixed sleeve 18 through the connecting pipe 171. At this time, the fixed sleeve 18 The piston body 181 drives the cleaning plate 19 to move downward. When one of the cross bars 15 is separated from the convex plate 12, the convex plate 12 and the limit plate 121 are automatically reset through the stored force of the reset spring 122. At the same time, the piston body 181 drives the cleaning plate 19 to reset. Therefore, such repeated operations can make the two groups of cleaning plates 19 move up and down reciprocatingly, so that the two groups of cleaning plates 19 can remove the slag and debris adhered to the side of the metal workpiece, which can improve the slag removal effect and will not affect the subsequent cutting operation. Then the cut metal workpiece falls onto the filter plate 81, and the slag and debris will fall onto the support plate 82 through the filter plate 81 for collection and placement.

[0022] Embodiment 2: The laser cutting device for metal processing and manufacturing in this embodiment can further improve the efficiency and quality of the cleaning plate 19 in removing the slag and debris adhered to the outer side of the metal workpiece. Figure 9-12As shown, the connecting assembly includes a slide bar 191 installed in a groove opened on the upper surface of the cleaning plate 19, and a connecting spring 192 is nested and connected to the outer side of one end of the slide bar 191, and the other end of the slide bar 191 passes through the lower end of the piston body 181. A connecting plate 20 is installed on the outer side of the cleaning plate 19, and the left side of the connecting plate 20 is arranged in an arc shape. Two rows of protrusions 21 are symmetrically installed on the inner wall of the left side of the shielding protection frame 7. The right end of the protrusion 21 is arranged in a semicircular shape. The distance between two adjacent protrusions 21 is greater than the height of the connecting plate 20. Protrusions 21 are arranged on the upper and lower sides of the left end of the connecting plate 20. The connecting plate 20 forms a left-right reciprocating sliding structure through the protrusions 21. On the basis of the first embodiment, when the two groups of cleaning plates 19 reciprocate up and down During movement, the cleaning plate 19 will drive the connecting plate 20 to move up and down reciprocatingly. At this time, the left end of the connecting plate 20 will contact with a row of equally spaced bosses 21 in turn. Since the right end of the boss 21 is semicircular and the left end of the connecting plate 20 is arc-shaped, the boss 21 applies a rightward thrust to the connecting plate 20, thereby causing the connecting plate 20 to drive the cleaning plate 19 to move back and forth left and right. At this time, the slide rod 191 in the cleaning plate 19 slides inside the lower part of the piston body 181, and cooperates with the stored force of the connecting spring 192 to make the cleaning plate 19 stably move up and down and left and right, so that the cleaning plate 19 can further remove the slag and debris on the surface of the metal workpiece.

[0023] Embodiment 3: The laser cutting device for metal processing and manufacturing in this embodiment is convenient for collecting and processing slag and debris. The specific structure is shown in the attached Figure 3-Figure 4 And attached Figure 8 As shown, a guide rail assembly 11 is fixed on the top of the right support frame 10, and a movable plate 9 is slidably connected on the top of the guide rail assembly 11. A cover plate 8 is fixed on the left side of the movable plate 9, and the left side of the cover plate 8 is fitted with the right side of the shielding and protection frame 7. A support plate 82 arranged in an arc shape is fixed to the lower left side of the cover plate 8, and a filter plate 81 is installed inside the support plate 82. The left end of the support plate 82 is inserted into the shielding and protection frame 7, and the highest point of the support plate 82 is lower than the horizontal center line position of the shielding and protection frame 7. On the basis of the first embodiment, the movable plate 9 can be slid to the right on the guide rail assembly 11 by an electric push rod or manually. At this time, the movable plate 9 drives the cover plate 8 to move to the right together, and then the cover plate 8 pulls the support plate 82 to move to the right, so that the support plate 82 is separated from the shielding and protection frame 7. At this time, the cut workpiece on the filter plate 81 can be taken out, and the slag and debris temporarily stored on the support plate 82 can be cleaned out.

[0024] In order to better demonstrate the cutting method of the laser cutting device for metal processing and manufacturing, in this embodiment, a cutting method of the laser cutting device for metal processing and manufacturing includes the following steps: The first step: the cylindrical metal workpiece is conveyed by the conveying roller 3, and then the metal workpiece is clamped by the three-jaw chuck assembly 14; Step 2: The three-jaw chuck assembly 14 drives the metal workpiece to rotate, and then the laser cutting head 6 performs the cutting operation; Step 3: The three-jaw chuck assembly 14 drives the cross bar 15 to rotate and squeeze the convex plate 12 in turn, so that the gas in the air storage bag 17 enters the fixed sleeve 18, and then automatically drives the cleaning plate 19 to move up and down to scrape and clean the impurities; Step 4: The cooperation between the protruding column 21 and the connecting plate 20 can drive the cleaning plate 19 to move up and down reciprocatingly and move left and right reciprocatingly to scrape and clean the impurities; Step 5: Finally, move the movable plate 9 to the right to take out the cut metal workpiece on the filter plate 81.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser cutting device for metal processing and manufacturing, comprising a workbench (1), and a left support frame (2) and a right support frame (10) respectively connected to the left and right sides of the workbench (1); A row of conveying rollers (3) is installed through the top of the left support frame (2); Features: A vertical plate (5) is installed on the upper left side of the workbench (1), and a three-jaw chuck assembly (14) is rotatably connected inside the vertical plate (5). A laser cutting head (6) is fixed on the upper right side of the vertical plate (5), and the lower end of the laser cutting head (6) passes through the upper surface of a shielding and protective frame (7) installed above the workbench (1). A fixed sleeve (18) is symmetrically installed inside the cylindrical shielding and protective frame (7), and a cleaning plate (19) for assisting in removing impurities is connected below the fixed sleeve (18). An automatic control assembly for controlling the reciprocating lifting of the cleaning plate (19) is symmetrically installed outside the shielding and protective frame (7).

2. A laser cutting device for metal processing and manufacturing according to claim 1, characterized in that: The front ends of a row of conveying rollers (3) form a transmission structure through a sprocket assembly (4).

3. The laser cutting device for metal processing and manufacturing according to claim 1, characterized in that: The outer side of the three-jaw chuck assembly (14) is connected to a transmission gear (16), and the lower side of the three-jaw chuck assembly (14) is meshedly connected to a driving gear (13) installed at the lower right side of the vertical plate (5).

4. The laser cutting device for metal processing and manufacturing according to claim 1, characterized in that: A circle of cross bars (15) are installed at equal intervals on the right side of the three-jaw chuck assembly (14), and there is a distance between the right end of the cross bar (15) and the lower end of the laser cutting head (6).

5. The laser cutting device for metal processing and manufacturing according to claim 4, characterized in that: The automatic control component comprises an air storage bag (17) symmetrically mounted in a receiving groove (71) provided on the outer side of the shielding protection frame (7); a limit plate (121) is arranged above the air storage bag (17); a semicircular convex plate (12) is integrally connected to the upper side of the limit plate (121); the diameter of the convex plate (12) is smaller than the length of the limit plate (121); the limit plate (121) is slidably connected to the receiving groove (71); and the lower sides of the left and right sides of the limit plate (121) are connected to the inside of the receiving groove (71) via return springs (122); A connecting pipe (171) is fixed below the air storage bag (17); A cross bar (15) is arranged on the outer side of the convex plate (12), and the convex plate (12) forms a sliding structure with the shielding protection frame (7) through the cross bar (15).

6. The laser cutting device for metal processing and manufacturing according to claim 5, characterized in that: The interior of the fixed sleeve (18) is fitted and slidably connected with a piston body (181), and the lower end of the piston body (181) is connected to a cleaning plate (19) via a connecting assembly; The lower end of the connecting tube (171) penetrates the surface of the shielding protection frame (7) and is inserted into the upper interior of the fixed sleeve (18).

7. The laser cutting device for metal processing and manufacturing according to claim 6, characterized in that: The connecting assembly comprises screws, and the cleaning plate (19) slides reciprocatingly up and down together with the piston body (181) via the screws.

8. The laser cutting device for metal processing and manufacturing according to claim 6, characterized in that: The connecting assembly comprises a slide rod (191) installed in a groove formed on the upper surface of the cleaning plate (19), a connecting spring (192) being nested and connected to the outer side of one end of the slide rod (191), and the other end of the slide rod (191) passing through the lower end of the piston body (181); A connecting plate (20) is installed on the outer side surface of the cleaning plate (19), and the left side surface of the connecting plate (20) is arranged in an arc shape; Two rows of convex columns (21) are symmetrically mounted on the inner wall of the left side of the shielding protection frame (7); the right ends of the convex columns (21) are arranged in a semicircular shape; the distance between two adjacent convex columns (21) is greater than the height of the connecting plate (20); convex columns (21) are arranged above and below the left end of the connecting plate (20); and the connecting plate (20) forms a left-right reciprocating sliding structure through the convex columns (21).

9. The laser cutting device for metal processing and manufacturing according to claim 1, characterized in that: A guide rail assembly (11) is fixed above the right support frame (10), a movable plate (9) is slidably connected above the guide rail assembly (11), a cover plate (8) is fixed to the left side of the movable plate (9), the left side of the cover plate (8) is arranged to fit the right side of the shielding protection frame (7), a support plate (82) arranged in an arc shape is fixed below the left side of the cover plate (8), a filter plate (81) is installed inside the support plate (82), the left end of the support plate (82) is inserted into the shielding protection frame (7), and the highest point of the support plate (82) is lower than the horizontal center line position of the shielding protection frame (7).

10. A cutting method in a laser cutting device for metal processing and manufacturing according to any one of claims 1 to 9, comprising the following steps: S1: conveying a cylindrical metal workpiece by a conveying roller (3), and then clamping the metal workpiece by a three-jaw chuck assembly (14); S2: The three-jaw chuck assembly (14) drives the metal workpiece to rotate, and then the laser cutting head (6) performs cutting operation; S3: The three-jaw chuck assembly (14) drives the cross bar (15) to rotate and squeeze the convex plate (12) in turn, so that the gas in the gas storage bag (17) enters the fixed sleeve (18), and then automatically drives the cleaning plate (19) to move up and down in a reciprocating manner to scrape and clean the impurities; S4: The cleaning plate (19) can be driven to move up and down reciprocatingly and move left and right reciprocatingly through the cooperation of the protruding column (21) and the connecting plate (20) to scrape and clean the impurities; S5: Finally, the movable plate (9) is moved rightward to take out the cut metal workpiece on the filter plate (81).

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