Cutting device for sheet metal materials

Abstract

The invention relates to the technical field of sheet metal machining equipment, in particular to a cutting device for sheet metal materials, which comprises a laser cutting and double-gas-path gas supply core module, and the core module comprises a fixed pipe, a gas supply pipe, a laser head, a double-gas-path conveying assembly and a three-way pipe; and the air supply pipe is mounted at the top of the fixed pipe. According to the cutting device for the metal plate material, a double-gas-path structure of the oxygen supply pipe and the nitrogen supply pipe is arranged, a pressure regulating valve and an electromagnetic valve are matched, the differential cutting technology of low pressure and high speed of nitrogen and middle-high pressure and adaptive speed of oxygen is achieved, the larger the thickness of a plate is, the larger the oxygen supply pressure can be correspondingly increased, and the cutting speed is properly reduced; it is ensured that thin material cutting is free of oxidation, thick material cutting combustion supporting is sufficient, and flat penetrating cutting is achieved; and meanwhile, the telescopic air cylinder can adjust the downward moving distance of the fixing pipe, the cutting distance between the laser head and the metal plate is accurately controlled, and the cutting precision is further improved.

Description

Technical Field

[0001] This invention belongs to the technical field of sheet metal processing equipment, specifically relating to a cutting device for sheet metal materials, which is particularly suitable for the precise cutting of sheet metal of different thicknesses. It can flexibly switch the air supply mode and cutting parameters according to the sheet metal thickness, adapting to the sheet metal processing needs of multiple scenarios. Background Technology

[0002] In the sheet metal processing industry, laser cutting is widely used in the processing and production of various sheet metal components due to its advantages such as high cutting precision, high efficiency, and smooth cut edges. Currently, most existing laser cutting devices use a single laser head and a single gas supply method for cutting, which makes it difficult to adapt to the cutting needs of sheet metal of different thicknesses and presents many limitations.

[0003] For cutting thin sheet metal (thickness less than 3mm), inert gas is required to isolate oxygen and prevent oxidation of the cut. At the same time, the gas supply pressure and speed need to be precisely controlled. However, existing devices often cannot achieve fine adjustment of the gas supply pressure, and the nitrogen nozzle angle is fixed, resulting in poor compatibility between the jet range and the laser cutting point, which easily produces slag residue and affects the flatness of the cut. For cutting thick sheet metal (thickness greater than 3mm), oxygen-assisted combustion is required to increase the cutting energy to achieve penetrating cut. Existing devices have insufficient matching between oxygen supply pressure adjustment and cutting speed, which easily leads to problems such as insufficient combustion reaction, many burrs on the cut, and the inability to penetrate thick materials smoothly.

[0004] Furthermore, the gas path switching structure of existing devices mostly adopts simple valve control, which has poor sealing performance during the switching process and is prone to nitrogen and oxygen cross-contamination. This not only affects the cutting effect, but may also cause equipment failure due to inaccurate gas path switching. At the same time, it is difficult to adjust the cutting distance between the laser head and the sheet metal, as well as the coordinated adjustment of the gas supply parameters and the nozzle angle. It is impossible to achieve full-process adaptive adjustment according to the sheet metal thickness, which makes it difficult to balance cutting efficiency and processing quality, and thus fails to meet the needs of large-scale and diversified sheet metal processing. Summary of the Invention

[0005] The purpose of this invention is to provide a cutting device for sheet metal materials, thereby solving the problem mentioned in the background art of difficulty in assisting with the cutting of sheet metal of different thicknesses. To achieve the above objective, this invention provides the following technical solution: a cutting device for sheet metal materials, comprising a laser cutting and dual-air supply core module, wherein the core module includes a fixed pipe, an air supply pipe, a laser head, a dual-air delivery assembly, and a three-way pipe; the air supply pipe is installed at the top of the fixed pipe and extends to the bottom of the fixed pipe at its lower end; three laser heads are provided, distributed circumferentially along the lower end of the air supply pipe and installed at the bottom of the fixed pipe;

[0006] The three-way pipe is connected to the upper end of the gas supply pipe. The dual-gas delivery assembly includes an oxygen supply pipe, a nitrogen supply pipe, a high-pressure oxygen cylinder, and a high-pressure nitrogen cylinder. The oxygen supply pipe and the nitrogen supply pipe are respectively connected to two branches of the three-way pipe. The end of the oxygen supply pipe away from the three-way pipe is connected to the high-pressure oxygen cylinder, and the end of the nitrogen supply pipe away from the three-way pipe is connected to the high-pressure nitrogen cylinder. Both the high-pressure oxygen cylinder and the high-pressure nitrogen cylinder are equipped with solenoid valves, and both the oxygen supply pipe and the nitrogen supply pipe are equipped with pressure regulating valves.

[0007] The gas supply and cutting process are adapted to different sheet metal thicknesses: When the sheet metal thickness is less than 3mm, nitrogen low pressure + high speed cutting is used; when the sheet metal thickness is greater than 3mm, oxygen medium and high pressure + appropriate cutting speed cutting is used. The greater the thickness of the sheet metal, the higher the oxygen supply pressure and the cutting speed is appropriately reduced to ensure that the combustion reaction between the laser and oxygen is sufficient to achieve a flat and penetrating cut of thick materials.

[0008] Preferably, it also includes a frame sliding and cutting distance adjustment structure, which includes a cutting frame, a transverse sliding frame, a longitudinal sliding frame, and a telescopic cylinder;

[0009] The transverse sliding frame is slidably mounted on the cutting machine frame, and the longitudinal sliding frame is longitudinally slidably mounted on the transverse sliding frame; the telescopic cylinder is mounted on the longitudinal sliding frame and is used to control the downward movement of the fixed tube to adapt to the cutting distance between the laser head and the sheet metal, and the fixed tube is mounted on the longitudinal sliding frame.

[0010] Preferably, it also includes a basic structure for adjusting the air passage opening and closing, wherein each of the two branch pipes of the three-way pipe is fixedly connected to a vent plate, the vent of the vent plate is eccentrically set, a drive gear is rotatably connected to the center of the bottom of the vent plate, an eccentrically set sealing plate is fixedly sleeved on the upper end of the drive gear, the sealing plate is attached to the bottom of the vent plate, and an eccentric cam is eccentrically fixedly sleeved on the bottom of the drive gear.

[0011] The three-way pipe is equipped with a first rack that is horizontally limited and slidable. The first rack can move horizontally left and right to mesh with the drive gear, thereby causing the sealing disc to deflect and open or seal the vent of the vent disc.

[0012] Preferably, it also includes a pneumatic adjustment synchronous drive structure, wherein a transmission gear is meshed on the first rack, the shaft of the transmission gear extends to the outer wall of the three-way pipe and is fixedly connected to a rotating gear, a second rack is meshed on the rotating gear, and a drive cylinder is fixedly connected to the end of the second rack, the drive cylinder being installed on the top of the fixed pipe.

[0013] Preferably, it also includes a nitrogen gas path reset structure, which is configured corresponding to the nitrogen supply pipe and includes a drive shaft, a spring, an inclined extrusion plate, a drive plate, a reset spring telescopic rod, and a rounded push plate. The drive shaft is rotatably connected to the bottom of the venting plate corresponding to the nitrogen supply pipe. The spring is sleeved on the top side of the drive shaft, with one end fixedly connected to the drive shaft and the other end fixedly connected to the bottom surface of the venting plate. The inclined extrusion plate is fixedly connected to the side of the drive shaft and is on the same horizontal plane as the eccentric cam. The drive plate is fixedly sleeved on the bottom side of the drive shaft, located below the inclined extrusion plate, and is L-shaped with the inclined extrusion plate.

[0014] The reset spring telescopic rod is hinged between the top of the drive plate and the side of the drive shaft; the rounded corner push plate is fixedly connected to the bottom of the first rack, which can drive the drive plate to deflect. Through the inclined surface of the inclined extrusion plate and the eccentric cam, the linear extrusion force of the inclined surface is converted into the rotational force of the drive gear, thereby driving the sealing disc to reset.

[0015] Preferably, it also includes a nitrogen gas path locking structure, which includes a limiting frame, a toothed locking plate, a spring telescopic rod, an inclined plate, and a pushing shaft;

[0016] The limiting frame is fixedly connected to the bottom of the ventilation plate of the corresponding nitrogen supply pipe. The toothed clamp is horizontally slidably disposed in the limiting frame, and two spring telescopic rods are hinged to one end. The end of the spring telescopic rod away from the toothed clamp is hinged to the limiting frame. One end of the toothed clamp is horizontally engaged and locked to the side of the drive gear of the corresponding nitrogen supply pipe. The inclined plate is fixedly connected to the bottom surface of the toothed clamp. The push shaft is offset and fixedly connected to the top of the first rack, and is disposed on both sides of the inclined plate.

[0017] Preferably, it also includes a nitrogen nozzle angle adjustment structure, which includes a rotating ring, a sloping groove plate, a push shaft, a drive rod, a sloping groove push plate, a push rod, and a nitrogen nozzle;

[0018] The rotating ring is rotatably connected to the top surface of the fixed tube, the inclined groove plate is fixedly connected to the inner wall of the rotating ring, the pushing shaft is slidably connected to the inclined groove of the inclined groove plate and fixed to one end of the driving cylinder; there are four driving rods, which are circumferentially fixedly connected to the outer ring of the rotating ring, and the inclined groove push plate is sleeved on the outside of the driving rod and vertically limited to slide on the side of the fixed tube.

[0019] One end of the push rod is hinged to the bottom of the inclined groove push plate, and the other end is hinged to the nitrogen nozzle; there are four nitrogen nozzles, which are distributed circumferentially along the lower end of the nitrogen supply pipe and connected to the auxiliary nitrogen high-pressure tank through the connecting pipe. The auxiliary nitrogen high-pressure tank is equipped with a solenoid valve.

[0020] Preferably, the inclined groove push plate is T-shaped; a torsion spring is sleeved on the upper side of the drive gear shaft corresponding to the nitrogen supply pipe, one end of the torsion spring is fixedly connected to the side of the drive gear shaft, and the other end is fixed to the bottom of the vent plate. The torsion spring is a constant force torsion spring, and its torque can be overcome by the meshing force between the first rack and the drive gear to realize the adjustment of the vent.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention offers strong adaptability, excellent cutting quality, and caters to the cutting needs of sheet metal of varying thicknesses. By employing a dual-gas-path structure with oxygen and nitrogen supply pipes, coupled with a pressure regulating valve and a solenoid valve, it achieves differentiated cutting processes: low-pressure nitrogen at high speed and medium-high pressure oxygen at a suitable speed. For thicker sheet metal, the oxygen supply pressure can be increased and the cutting speed appropriately reduced, ensuring no oxidation during thin material cutting and sufficient combustion for thick material cutting, resulting in a smooth, penetrating cut. Simultaneously, the telescopic cylinder adjusts the downward movement distance of the fixed pipe, precisely controlling the cutting distance between the laser head and the sheet metal, further enhancing cutting accuracy.

[0023] This invention offers precise and reliable gas path switching with excellent sealing performance. Utilizing a three-way pipe, vent plate, sealing plate, and a drive gear and rack transmission structure, it achieves stable switching between nitrogen and oxygen gas paths. The eccentrically positioned vent on the vent plate, in conjunction with the sealing plate, allows for precise adjustment of the ventilation volume, adapting to the gas supply needs of sheet metals of varying thicknesses. A toothed locking plate, in conjunction with a spring telescopic rod, circumferentially locks the drive gear after switching, preventing sealing plate misalignment. Simultaneously, a dual reset structure—combining an eccentric cam, a sloped extrusion plate, a torsion spring, and a spring—ensures precise sealing plate reset, effectively preventing gas path cross-contamination and enhancing the stability and reliability of gas path switching.

[0024] This invention features high-precision jetting, enhancing cutting performance: By driving the cylinder to rotate the ring, the inclined groove push plate, and the push rod, the angle of the nitrogen nozzle is adaptively adjusted. The jetting direction can be precisely aligned with the laser cutting point according to the sheet metal thickness, forming a highly efficient airflow barrier. This not only effectively removes molten slag but also effectively isolates oxygen during thin material cutting, reducing oxidation defects. Combined with three circumferentially distributed laser heads, it further improves cutting efficiency and cut smoothness. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a partial three-dimensional structural diagram of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the nitrogen nozzle and drive rod of the present invention;

[0028] Figure 4 For the present invention Figure 3Enlarged view of the structure at point A in the middle;

[0029] Figure 5 This is a three-dimensional structural diagram of the present invention with the fixed tube and the air supply tube separated.

[0030] Figure 6 This is a three-dimensional cross-sectional view of the three-way pipe of the present invention;

[0031] Figure 7 This is a three-dimensional structural diagram of the transmission gear and the rotating gear of the present invention;

[0032] Figure 8 For the present invention Figure 7 Enlarged view of the structure at point B in the middle;

[0033] Figure 9 This is a three-dimensional structural diagram of the sealing disc and eccentric cam of the present invention;

[0034] Figure 10 This is a three-dimensional structural diagram of the inclined extrusion plate and the drive plate of the present invention;

[0035] Figure 11 This is a three-dimensional structural diagram of the toothed clamping plate and spring telescopic rod of the present invention;

[0036] Figure 12 This is a three-dimensional cross-sectional view of the tooth clamp plate of the present invention.

[0037] In the diagram: 1. Cutting frame; 2. Horizontal sliding frame; 3. Longitudinal sliding frame; 4. Fixed pipe; 41. Air supply pipe; 42. Laser head; 43. Oxygen supply pipe; 44. Nitrogen supply pipe; 45. Ventilation disc; 46. Drive gear; 47. Sealing disc; 48. Eccentric cam; 49. T-pipe; 410. First rack; 411. Transmission gear; 412. Rotating gear; 413. Second rack; 414. Drive cylinder; 5. Drive shaft; 51. Spring; 52. Inclined extrusion plate; 53. Drive plate; 54. Return spring telescopic rod; 55. Rounded corner push plate; 6. Limiting frame; 61. Toothed clamping plate; 62. Inclined plate; 63. Push shaft; 64. Spring telescopic rod; 7. Rotating ring; 71. Inclined groove plate; 72. Push shaft; 73. Inclined groove push plate; 74. Push rod; 75. Nitrogen nozzle; 76. Drive rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 12 The present invention provides a technical solution: a cutting device for sheet metal materials, including a cutting frame 1, a transverse sliding frame 2 slidably disposed on the cutting frame 1, and a longitudinal sliding frame 3 slidably disposed on the transverse sliding frame 2; a telescopic cylinder for controlling the downward movement of the fixed tube 4 is disposed on the longitudinal sliding frame 3 to adapt to the cutting distance between the laser head 42 and the sheet metal.

[0040] A fixed tube 4 is installed on the longitudinal sliding frame 3. An air supply pipe 41 is installed on the top of the fixed tube 4. The lower end of the air supply pipe 41 extends to the bottom of the fixed tube 4. Three laser heads 42 are installed at the bottom of the fixed tube 4. The three laser heads 42 are distributed circumferentially along the lower end of the air supply pipe 41.

[0041] The upper end of the gas supply pipe 41 is connected to a three-way pipe 49. The two ends of the three-way pipe 49 are respectively connected to an oxygen supply pipe 43 and a nitrogen supply pipe 44. One end of the oxygen supply pipe 43 is connected to a high-pressure oxygen cylinder, and a solenoid valve is installed on the high-pressure oxygen cylinder. One end of the nitrogen supply pipe 44 is connected to a high-pressure nitrogen cylinder, and a solenoid valve is installed on the high-pressure nitrogen cylinder.

[0042] Pressure regulating valves are installed on oxygen supply pipe 43 and nitrogen supply pipe 44 respectively. When the sheet metal thickness is less than 3mm, it is used with low-pressure nitrogen + high-speed cutting; when the sheet metal thickness is greater than 3mm, it is used with medium-high pressure oxygen + cutting speed adapted to the cutting speed. The thicker the sheet metal, the higher the oxygen supply pressure and the cutting speed is appropriately reduced to ensure that the combustion reaction between laser and oxygen is sufficient and to achieve flat penetration cutting of thick materials.

[0043] A vent plate 45 is fixedly connected to each of the two branch pipes of the three-way pipe 49. The vent of the vent plate 45 is eccentrically set. A drive gear 46 is rotatably connected to the center of the bottom of the vent plate 45. An eccentrically set sealing plate 47 is fixedly sleeved on the upper end of the drive gear 46 and the sealing plate 47 is attached to the bottom of the vent plate 45. An eccentric cam 48 is eccentrically fixedly sleeved on the bottom of the drive gear 46. The eccentric outer periphery of the eccentric cam 48 is attached to the inclined surface of the inclined extrusion plate 52, and the linear extrusion force of the inclined surface is converted into the rotational force of the drive gear, thereby driving the sealing plate to reset.

[0044] The first rack 410 is horizontally limited and slidably arranged inside the three-way pipe 49. The first rack 410 can move horizontally left and right to mesh with the drive gear 46, thereby driving the sealing disc 47 to deflect and open or seal the vent of the vent disc 45.

[0045] A transmission gear 411 is meshed on the first rack 410. The shaft of the transmission gear 411 extends to the outer wall of the three-way pipe 49 and is fixedly connected to a rotating gear 412. A second rack 413 is meshed on the rotating gear 412. A drive cylinder 414 is fixedly connected to the end of the second rack 413. The drive cylinder 414 is mounted on the top of the fixed pipe 4.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, a drive shaft 5 is rotatably connected to the bottom of the venting disc 45 corresponding to the nitrogen supply pipe 44. A spring 51 is sleeved on the top of the side of the drive shaft 5. One end of the spring 51 is fixedly connected to the drive shaft 5, and the other end is fixedly connected to the bottom surface of the venting disc 45. The spring 51 is used to reset the drive shaft 5 after it has been deflected.

[0047] An inclined extrusion plate 52 is fixedly connected to the side of the drive shaft 5. The inclined extrusion plate 52 and the eccentric cam 48 are on the same horizontal plane. A drive plate 53 is fixedly sleeved at the bottom of the side of the drive shaft 5. The drive plate 53 is below the inclined extrusion plate 52, and the drive plate 53 and the inclined extrusion plate 52 are arranged in an L-shape.

[0048] A return spring telescopic rod 54 is hinged between the top of the drive plate 53 and the side of the drive shaft 5;

[0049] The bottom of the first rack 410 is fixedly connected to a rounded push plate 55 that can drive the drive plate 53 to deflect.

[0050] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, a limit frame 6 is also fixedly connected to the bottom of the ventilation plate 45 corresponding to the nitrogen supply pipe 44. A toothed clamping plate 61 is horizontally slidably arranged inside the limit frame 6. Two spring telescopic rods 64 are hinged to one end of the toothed clamping plate 61. The ends of the two spring telescopic rods 64 away from the toothed clamping plate 61 are hinged to the limit frame 6.

[0051] One end of the toothed plate 61 is horizontally engaged and locked on the side of the drive gear 46 corresponding to the nitrogen supply pipe 44; the toothed plate 61 is locked on the side of the drive gear 46 corresponding to the nitrogen supply pipe 44 through tooth engagement, thereby achieving circumferential locking of the drive gear 46.

[0052] A sloping plate 62 is fixedly connected to the bottom surface of the toothed plate 61. Pushing shafts 63 are located on both sides of the sloping plate 62. The pushing shafts 63 are fixedly connected to the top of the first rack 410 in a staggered manner.

[0053] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12As shown, a rotating ring 7 is rotatably connected to the top surface of the fixed pipe 4. An inclined groove plate 71 is fixedly connected to the inner wall of the rotating ring 7. A push shaft 72 is slidably connected in the inclined groove of the inclined groove plate 71. The push shaft 72 is fixed to one end of the drive cylinder 414. Four drive rods 76 are fixedly connected to the outer circumference of the rotating ring 7. An inclined groove push plate 73 is sleeved on the outside of the drive rods 76. The inclined groove push plate 73 is vertically limited and slidably on the side of the fixed pipe 4. A push rod 74 is hinged to the bottom of the inclined groove push plate 73. A nitrogen nozzle 75 is hinged to the end of the push rod 74 away from the inclined groove push plate 73. The four nitrogen nozzles 75 are distributed circumferentially along the bottom end of the gas supply pipe 41. The nitrogen nozzles 75 are connected to the auxiliary nitrogen high-pressure tank through a connecting pipe. A solenoid valve is installed on the auxiliary nitrogen high-pressure tank.

[0054] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the inclined groove push plate 73 is T-shaped.

[0055] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, a torsion spring is fitted onto the upper side of the drive gear 46 shaft. One end of the torsion spring is fixedly connected to the side of the drive gear 46 shaft, and the other end is fixed to the bottom of the vent plate 45. The torsion spring is a constant-force torsion spring, and its torque can be overcome by the meshing force between the first rack 410 and the drive gear 46, thereby adjusting the vent.

[0056] The method of use and advantages of the present invention: The working process of this sheet metal material cutting device is as follows:

[0057] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 As shown, the sheet metal is placed on the cutting machine frame 1. When the sheet metal thickness is less than 3mm, nitrogen is used to assist in cutting. Nitrogen is an inert gas that can isolate oxygen and prevent oxidation, while forming an airflow barrier to blow away trace amounts of molten slag.

[0058] According to the sheet metal thickness, the distance between the laser head 42 and the sheet metal is adjusted, and the drive cylinder 414 is controlled to retract to drive the second rack 413 to move, thereby causing the rotating gear 412 and the transmission gear 411 to rotate counterclockwise synchronously, pushing the first rack 410 to move to the right. When the first rack 410 moves to the right, its upper left end push shaft 63 presses the inclined plate 62, pushing the toothed plate 61 to move away from the drive gear 46. At this time, the spring telescopic rod 64 deflects and stretches synchronously, pushing the toothed plate 61 to move away from the drive gear 46. The toothed plate 61 separates from the drive gear 46, releasing the locking state of the toothed plate 61 to the drive gear 46.

[0059] Then, the torsion spring on the shaft of the drive gear 46 drives the right sealing disc 47 to deflect, releasing its sealing state on the venting disc 45. At this time, the venting port of the venting disc 45 corresponding to the nitrogen supply pipe 44 is at its maximum. Then, as the first rack 410 continues to move to the right and meshes with the right drive gear 46, it drives the upper sealing disc 47 and the eccentric cam 48 to deflect simultaneously, gradually reducing the size of the venting port of the venting disc 45 corresponding to the nitrogen supply pipe 44. This is to adapt to the cutting of sheet metal with a thickness of less than 3mm. The smaller the thickness, the smaller the venting port of the venting disc 45 corresponding to the nitrogen supply pipe 44.

[0060] Furthermore, when the drive cylinder 414 retracts, it drives the push shaft 72 to slide in the inclined groove of the inclined groove plate 71, causing the rotating ring 7 to drive the drive rod 76 to rotate counterclockwise, thereby squeezing the inclined groove push plate 73 to move down, and cooperating with the push rod 74 to drive the nitrogen nozzle 75 to deflect and converge, so that the jet direction is accurately aligned with the laser cutting point, so as to adjust the jet angle of the nitrogen nozzle 75 according to the thickness of the plate.

[0061] When cutting sheet metal thicker than 3mm, sufficient energy is needed to penetrate the material. Oxygen can work with the laser to aid combustion and improve cutting efficiency. By extending the drive cylinder 414, the rotating gear 412 and the transmission gear 411 are driven to rotate clockwise, causing the first rack 410 to move to the left.

[0062] When the first rack 410 moves to the left, it first separates from the right drive gear 46. Then, the rounded corner push plate 55 squeezes the drive plate 53 and, in conjunction with the reset spring telescopic rod 54, drives the inclined extrusion plate 52 to deflect. The inclined extrusion plate 52 deflects at the end of the inclined extrusion plate 52, squeezing the eccentric cam 48, causing the eccentric cam 48 to drive the sealing disc 47 to deflect and reset, thus sealing the vent of the vent plate 45 corresponding to the nitrogen supply pipe 44.

[0063] At this time, the first rack 410 continues to move to the left, causing the drive plate 53 to deflect, which in turn causes the return spring extension rod 54 to extend, ensuring that the first rack 410 can continue to move to the left. The push shaft 63 at the upper right end of the first rack 410 presses the inclined plate 62, causing the toothed plate 61 to move and engage with the drive gear 46, locking the right-side reset sealing disc 47, thus achieving the purpose of sealing the nitrogen supply pipe 44.

[0064] Subsequently, as the first rack 410 continues to move to the left and meshes with the left drive gear 46, it causes the left sealing disc 47 to deflect and open, opening the ventilation port of the ventilation disc 45 corresponding to the oxygen supply pipe 43. This ensures that when the device can cut plates larger than 3mm, the thicker the plate, the larger the ventilation port of the ventilation disc 45 opens, in order to assist the laser in coordinating combustion and improve cutting efficiency.

[0065] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cutting device for sheet metal materials, characterized in that, The system includes a laser cutting and dual-air supply core module, which includes a fixed pipe (4), an air supply pipe (41), a laser head (42), a dual-air supply assembly, and a three-way pipe (49). The air supply pipe (41) is installed on the top of the fixed pipe (4) and extends to the bottom of the fixed pipe (4). There are three laser heads (42), which are distributed circumferentially along the lower end of the air supply pipe (41) and installed at the bottom of the fixed pipe (4). The three-way pipe (49) is connected to the upper end of the gas supply pipe (41). The dual gas supply assembly includes an oxygen supply pipe (43), a nitrogen supply pipe (44), a high-pressure oxygen tank, and a high-pressure nitrogen tank. The oxygen supply pipe (43) and the nitrogen supply pipe (44) are respectively connected to two branches of the three-way pipe (49). The end of the oxygen supply pipe (43) away from the three-way pipe (49) is connected to the high-pressure oxygen tank. The end of the nitrogen supply pipe (44) away from the three-way pipe (49) is connected to the high-pressure nitrogen tank. The high-pressure oxygen tank and the high-pressure nitrogen tank are both equipped with solenoid valves. The oxygen supply pipe (43) and the nitrogen supply pipe (44) are both equipped with pressure regulating valves. The gas supply and cutting process are adapted to different sheet metal thicknesses as follows: When the sheet metal thickness is less than 3mm, nitrogen low pressure + high speed cutting is used; when the sheet metal thickness is greater than 3mm, oxygen medium and high pressure + appropriate cutting speed cutting is used. The greater the sheet metal thickness, the higher the oxygen supply pressure and the cutting speed is appropriately reduced to ensure that the combustion reaction between the laser and oxygen is sufficient to achieve a flat and penetrating cut of thick materials.

2. The cutting device for sheet metal materials according to claim 1, characterized in that: It also includes a frame sliding and cutting distance adjustment structure, which includes a cutting frame (1), a transverse sliding frame (2), a longitudinal sliding frame (3), and a telescopic cylinder; The transverse sliding frame (2) is slidably mounted on the cutting machine frame (1), and the longitudinal sliding frame (3) is longitudinally slidably mounted on the transverse sliding frame (2); the telescopic cylinder is mounted on the longitudinal sliding frame (3) to control the downward movement of the fixed tube (4) to adapt to the cutting distance between the laser head (42) and the sheet metal, and the fixed tube (4) is mounted on the longitudinal sliding frame (3).

3. The cutting device for sheet metal materials according to claim 1, characterized in that: It also includes a basic structure for adjusting the air passage opening and closing. Each of the two branch pipes of the three-way pipe (49) is fixedly connected to a vent plate (45). The vent of the vent plate (45) is eccentrically set. A drive gear (46) is rotatably connected to the center of the bottom of the vent plate (45). An eccentrically set sealing plate (47) is fixedly sleeved on the upper end of the drive gear (46). The sealing plate (47) is attached to the bottom of the vent plate (45). An eccentric cam (48) is eccentrically fixedly sleeved on the bottom of the drive gear (46). The three-way pipe (49) is equipped with a first rack (410) that is horizontally limited and slidably disposed inside. The first rack (410) can move horizontally left and right to mesh with the drive gear (46), thereby driving the sealing disc (47) to deflect and open or seal the vent of the vent disc (45).

4. A cutting device for sheet metal materials according to claim 3, characterized in that: It also includes a pneumatic adjustment synchronous drive structure, wherein a transmission gear (411) meshes on the first rack (410), the shaft of the transmission gear (411) extends to the outer wall of the three-way pipe (49) and is fixedly connected to a rotating gear (412), a second rack (413) meshes on the rotating gear (412), and a drive cylinder (414) is fixedly connected to the end of the second rack (413), and the drive cylinder (414) is installed on the top of the fixed pipe (4).

5. A cutting device for sheet metal materials according to claim 3, characterized in that: It also includes a nitrogen gas path reset structure, which is set in relation to the nitrogen supply pipe (44) and includes a drive shaft (5), a spring (51), an inclined extrusion plate (52), a drive plate (53), a reset spring telescopic rod (54), and a rounded push plate (55). The drive shaft (5) is rotatably connected to the bottom of the ventilation plate (45) corresponding to the nitrogen supply pipe (44). The spring (51) is sleeved on the top side of the drive shaft (5), with one end fixedly connected to the drive shaft (5) and the other end fixedly connected to the bottom surface of the ventilation plate (45). The inclined extrusion plate (52) is fixedly connected to the side of the drive shaft (5) and is on the same horizontal plane as the eccentric cam (48). The drive plate (53) is fixedly sleeved on the bottom side of the drive shaft (5), located below the inclined extrusion plate (52), and is set in an L-shape with the inclined extrusion plate (52). The reset spring telescopic rod (54) is hinged between the top of the drive plate (53) and the side of the drive shaft (5); the rounded corner push plate (55) is fixedly connected to the bottom of the first rack (410), which can drive the drive plate (53) to deflect. Through the inclined surface of the inclined extrusion plate (52) and the eccentric cam (48), the inclined linear extrusion force is converted into the rotational force of the drive gear (46), which drives the sealing disc (47) to reset.

6. A cutting device for sheet metal materials according to claim 5, characterized in that: It also includes a nitrogen gas path locking structure, which includes a limiting frame (6), a toothed clamping plate (61), a spring telescopic rod (64), an inclined plate (62), and a push shaft (63). The limiting frame (6) is fixedly connected to the bottom of the ventilation plate (45) of the corresponding nitrogen supply pipe (44). The toothed clamp (61) is horizontally slidably disposed in the limiting frame (6). Two spring telescopic rods (64) are hinged at one end. The end of the spring telescopic rod (64) away from the toothed clamp (61) is hinged to the limiting frame (6). One end of the toothed clamp (61) is horizontally engaged and locked to the side of the drive gear (46) of the corresponding nitrogen supply pipe (44). The inclined plate (62) is fixedly connected to the bottom surface of the toothed clamp (61). The push shaft (63) is offset and fixedly connected to the top of the first rack (410) and is disposed on both sides of the inclined plate (62).

7. A cutting device for sheet metal materials according to claim 1, characterized in that: It also includes a nitrogen nozzle angle adjustment structure, which includes a rotating ring (7), a sloping groove plate (71), a push shaft (72), a drive rod (76), a sloping groove push plate (73), a push rod (74), and a nitrogen nozzle (75); The rotating ring (7) is rotatably connected to the top surface of the fixed tube (4), the inclined groove plate (71) is fixedly connected to the inner wall of the rotating ring (7), the push shaft (72) is slidably connected to the inclined groove of the inclined groove plate (71) and fixed to one end of the drive cylinder (414); there are four drive rods (76), which are circumferentially fixedly connected to the outer ring of the rotating ring (7), and the inclined groove push plate (73) is sleeved on the outside of the drive rod (76) and vertically limited to slide on the side of the fixed tube (4); One end of the push rod (74) is hinged to the bottom of the inclined groove push plate (73), and the other end is hinged to the nitrogen nozzle (75); there are four nitrogen nozzles (75), which are distributed circumferentially along the lower end of the nitrogen supply pipe (41) and connected to the auxiliary nitrogen high-pressure tank through the connecting pipe. The auxiliary nitrogen high-pressure tank is equipped with a solenoid valve.

8. A cutting device for sheet metal materials according to claim 7, characterized in that: The inclined groove push plate (73) is T-shaped; a torsion spring is sleeved on the upper side of the drive gear (46) shaft corresponding to the nitrogen supply pipe (44). One end of the torsion spring is fixedly connected to the side of the drive gear (46) shaft, and the other end is fixed to the bottom of the ventilation plate (45). The torsion spring is a constant force torsion spring, and its torque can be overcome by the meshing force between the first rack (410) and the drive gear (46) to realize the adjustment of the ventilation port.

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