Low-power laser flame composite cutting method for medium-thickness plate

Abstract

The invention belongs to the technical field of laser cutting, and particularly relates to a low-power laser flame composite cutting method for a medium-thickness plate. Comprising the following steps that S1, when a laser cutting machine does not conduct cutting, an oxygen through groove and an oxygen groove do not communicate with an oxygen inlet pipe, and a fuel gas through groove does not communicate with a fuel gas inlet pipe; s2, when the laser cutting machine only carries out laser cutting, an oxygen inlet pipe only communicates with an oxygen through groove or only communicates with an oxygen groove by controlling a stepping motor; s3, when the laser cutting machine carries out flame cutting or laser-flame composite cutting, an oxygen inlet pipe is made to communicate with an oxygen through groove and an oxygen groove at the same time by controlling a stepping motor, and the proportion of oxygen and fuel gas for flame cutting is adjusted; according to the laser-flame composite cutting device, the laser cutting mode, the laser cutting mode, the flame cutting mode or the laser-flame composite cutting mode are rapidly and flexibly switched, and complex operation is not needed while different cutting requirements are met; according to the invention, the maintenance convenience can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of laser cutting, and in particular relates to a low-power laser-flame composite cutting method for medium and thick plates. Background Art

[0002] Laser flame composite cutting is an advanced manufacturing process that combines laser cutting and flame cutting technology. It is mainly used for efficient and precise cutting of metal materials. Its working principle is to use the high energy density of laser and the heat of flame to achieve rapid cutting of metals of different thicknesses and materials. It is especially suitable for cutting thicker metal sheets. This technology has the advantages of high cutting quality, small heat-affected zone, and less oxidation. It has been widely used in machinery manufacturing, automobiles, ships and other industries. In the future, with the continuous advancement of laser technology and materials science, laser flame composite cutting is expected to further improve its cutting efficiency and adaptability, and market demand will continue to grow.

[0003] The Chinese patent with application number 202410987907.5 discloses a large-format laser flame composite cutting machine. The large-format laser flame composite cutting machine includes a laser flame composite cutter head, which includes a shell, a laser module and a flame module located in the shell; the laser module is used to form a high-energy density laser beam and eject high-pressure oxygen coaxial with the laser beam; the flame module is used to mix the fuel gas and oxygen, and eject them to form a flame. When cutting thick plates, the mixed gas ignites at high temperature to form a flame that sprays toward the thick plate, and cooperates with the laser beam to quickly heat up the thick plate locally, achieving a faster cutting effect. In addition to playing a combustion-supporting role, the high-pressure oxygen coaxial with the laser beam can also blow away the molten or vaporized metal.

[0004] However, the device cannot actually achieve simultaneous laser and flame cutting due to the structural design of the piston, so it is impossible to flexibly switch between different cutting methods; at the same time, for equipment that can generally be switched, the operation is too cumbersome; and, for laser cutting equipment, focusing lenses and other parts are consumable parts that need to be replaced, and the replacement process is relatively troublesome, resulting in unchanged maintenance; at the same time, how to ensure cutting quality is also one of the research focuses. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a low-power laser flame composite cutting method for medium and thick plates. The present invention can quickly and flexibly switch between the following methods: no laser cutting, only laser cutting, and flame cutting or laser flame composite cutting. Different cutting requirements can be met without complicated operations. The present invention can also quickly replace the focusing tube, thereby improving the convenience of maintenance. The present invention realizes the oxygen supply for flame cutting and the blowing treatment of the cutting position to avoid flying slag. At the same time, only a single oxygen inlet pipe is required to realize two oxygen supplies and avoid oxygen occupying the laser pipeline. The structure and operation are simple while comprehensively avoiding the generation of cutting quality problems. The present invention can accurately control the ratio of oxygen and fuel gas for flame cutting to ensure sufficient combustion of the fuel gas, and at the same time ensure that oxygen is always blown out at the end of the lower gas pipeline. Regardless of laser cutting, flame cutting or laser flame composite cutting, the cutting position can always be blown to avoid flying slag. Flexible switching without unnecessary complicated operations can always ensure the safety of the equipment.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A low-power laser-flame composite cutting method for medium and thick plates comprises the following steps:

[0008] S1. When the laser cutting machine is not cutting, the oxygen slot and the oxygen slot are not connected to the oxygen inlet pipe, and the gas slot is not connected to the gas inlet pipe;

[0009] S2. When the laser cutting machine is only performing laser cutting, the stepper motor is controlled so that the oxygen inlet pipe is only connected to the oxygen slot or the oxygen inlet pipe is only connected to the oxygen slot;

[0010] S3. When the laser cutting machine performs flame cutting or laser flame composite cutting, the oxygen inlet pipe is connected to the oxygen slot and the oxygen slot at the same time by controlling the stepper motor, and the ratio of oxygen and fuel gas for flame cutting is adjusted;

[0011] S4. When the laser cutting machine needs to replace the focusing tube, rotate the focusing tube to release the first internal threaded port from the first external threaded port, and release the second internal threaded port from the second external threaded port, and then replace the new focusing tube to achieve quick replacement.

[0012] Furthermore, the laser cutting machine includes a fiber laser, the output end of the fiber laser is fixedly connected to a focusing tube, and the outer portion of the focusing tube is sequentially sleeved with an upper gas pipeline, a middle gas pipeline and a lower gas pipeline from top to bottom; the upper gas pipeline, the middle gas pipeline and the lower gas pipeline are sequentially fixedly connected;

[0013] The outer wall of the upper gas pipeline is fixedly connected with an oxygen inlet pipe and a fuel gas inlet pipe on both sides; the outer wall of the middle gas pipeline is fixedly provided with a rotating outer ring groove, and the rotating outer ring groove is rotatably connected with a blowing mechanism;

[0014] A rotating inner ring groove is fixedly provided on the inner side wall of the upper gas pipeline, and the oxygen intake pipe and the fuel gas intake pipe are both connected to the rotating inner ring groove; a switching mechanism is rotatably connected to the rotating inner ring groove.

[0015] Furthermore, the blowing mechanism comprises an oxygen ring box, which is sleeved on the rotating outer ring groove and fits with the rotating outer ring groove; a plurality of blowing pipes are evenly fixed and connected to the bottom of the oxygen ring box; a sliding notch is transversely penetrated on the rotating outer ring groove, and the sliding notch is connected to the inside of the middle gas pipeline;

[0016] A gear ring is fixedly provided on the top of the oxygen ring box in an annular direction, and a stepper motor is fixedly installed on the outer side of the middle gas pipeline. The output end of the stepper motor is meshed with the gear ring through a gear.

[0017] Furthermore, the switching mechanism includes a rotating ring, the rotating ring is fitted with the rotating inner ring groove; a gas through groove and an oxygen through groove are formed on the rotating ring, an oxygen groove is formed on the outer wall of the rotating ring and located on one side of the oxygen through groove, and an air outlet is formed inside the oxygen groove;

[0018] The inner side wall of the oxygen ring box is fixedly connected with a connecting pipe, and the connecting pipe passes through the sliding slot and extends into the interior of the middle gas pipeline; the connecting pipe is fixedly connected with the gas outlet at one end away from the oxygen ring box.

[0019] Furthermore, when the oxygen groove is fully connected to the oxygen inlet pipe, the gas inlet pipe is not connected to the gas groove; when the rotating ring rotates so that the oxygen groove and the oxygen tank are both connected to the oxygen inlet pipe, the gas inlet pipe is connected to the gas groove; when the oxygen tank is fully connected to the oxygen inlet pipe, the gas inlet pipe is not connected to the gas groove.

[0020] Furthermore, the focusing tube includes a closed ring, a focusing lens is fixedly connected to the middle of the closed ring, a first internal threaded port is fixedly provided on the periphery of the top of the closed ring, and a second internal threaded port is fixedly provided on the periphery of the bottom of the closed ring; a tube body is provided at the bottom of the closed ring, and the tube body includes a conical tube body and a cylindrical tube body that are fixedly connected to each other; the large-diameter end of the conical tube body is fixedly connected to the bottom of the closed ring.

[0021] Furthermore, the fiber laser comprises a laser body, an output end of the laser body is fixedly connected with a laser channel, an end of the laser channel away from the laser body is fixedly provided with a first external threaded port, and the first external threaded port is threadedly connected with the first internal threaded port;

[0022] A second external threaded port is fixedly provided at one end of the upper gas pipeline close to the optical fiber laser, and the second external threaded port is threadedly connected to the second internal threaded port.

[0023] Furthermore, the upper end of the lower gas pipeline is a cylindrical structure, and the lower end of the lower gas pipeline is a conical structure.

[0024] Furthermore, the end of the cylindrical tube does not extend out of the gas outlet end of the lower gas pipeline; the cylindrical tube and the lower gas pipeline are coaxially arranged.

[0025] Furthermore, the upper gas pipeline, the middle gas pipeline and the lower gas pipeline are fixedly connected in sequence in a detachable fixed connection.

[0026] Furthermore, a control box is fixedly installed on one side of the fiber laser, and limit plates are fixedly provided on the upper and lower ends of the control box on a side away from the fiber laser, and two sliding rods are fixedly connected between the two limit plates; a mounting plate is slidably connected to the two sliding rods, and screw holes are provided at both ends of the mounting plate; a limit spring is sleeved on the sliding rod, and the two ends of the limit spring are respectively fixedly connected to the mounting plate and the limit plate below.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention can quickly and flexibly switch between the following modes: no laser cutting, only laser cutting, flame cutting, or laser-flame combined cutting. Different cutting requirements can be met without complicated operations, and only the stepper motor needs to be controlled. At the same time, it also ensures that the oxygen blowing state is always maintained when switching cutting, thereby quickly avoiding flying slag. Moreover, the present invention can also quickly replace the focusing tube, and only the focusing tube needs to be rotated for replacement, thereby improving the convenience of maintenance.

[0029] (2) The present invention realizes the oxygen supply for flame cutting and the blowing treatment of the cutting position to avoid flying slag through the cooperation of the blowing mechanism and the switching mechanism. At the same time, only a single oxygen inlet pipe is needed to realize two oxygen supply modes and avoid oxygen occupying the laser pipeline. The structure and operation are simple and the cutting quality problems are avoided comprehensively. Specifically, the oxygen ring box is rotated on the rotating outer ring groove through the control of the stepper motor, so that the oxygen inlet pipe is connected with the oxygen through groove and the oxygen groove at the same time, wherein the oxygen entering the oxygen through groove is mixed with the fuel gas entering from the fuel gas through groove, and after mixing, it is ejected through the channel between the lower gas pipeline and the focusing tube and ignited by the laser in the focusing tube for flame cutting. At the same time, the oxygen entering the oxygen groove enters the oxygen ring box from the connecting pipe and is then blown out through multiple blowing pipes, avoiding the problem that the iron slag splashing generated by cutting affects the lower gas pipeline and causes equipment damage. In this way, only a single oxygen inlet pipe is needed to realize two oxygen supply modes and avoid oxygen occupying the laser pipeline, avoiding the problem that oxygen causes laser scattering and interferes with laser output and causes laser quality degradation. The structure and operation are simple and the cutting quality problems are avoided comprehensively.

[0030] (3) The present invention can not only accurately control the ratio of oxygen and fuel gas in flame cutting to ensure sufficient combustion of the fuel gas, but also ensure that oxygen is always blown out from the end of the lower gas pipeline. Regardless of laser cutting, flame cutting or laser-flame composite cutting, the cutting position can always be blown to avoid flying slag. Flexible switching can be performed without unnecessary and complicated operations to ensure the safety of the equipment. Specifically, when the rotating ring rotates to connect the oxygen groove and the oxygen slot to the oxygen inlet pipe, the fuel gas inlet pipe is connected to the fuel gas groove. At this time, the oxygen ring box continues to rotate on the rotating outer ring groove through the stepper motor. Under the fixing action of the connecting pipe, the rotating ring rotates. At this time, the caliber of the connection between the oxygen groove and the oxygen inlet pipe and the caliber of the connection between the fuel gas groove and the fuel gas inlet pipe change in the opposite direction. That is, the ratio of oxygen and fuel gas mixture can be quickly adjusted, and rapid and accurate control can be performed through the color of the combustion flame. , to ensure full combustion of the gas; at the same time, when the oxygen slot is fully connected with the oxygen inlet pipe, the gas inlet pipe is not connected with the gas slot, and all the oxygen is ejected from between the lower gas pipeline and the focusing tube to avoid flying slag, and only laser cutting is performed at this time; when the oxygen slot and the oxygen slot are both connected with the oxygen inlet pipe, the gas inlet pipe is connected with the gas slot, and oxygen is ejected through the air blow pipe to avoid flying slag, and it can be flame cutting or laser flame composite cutting at this time; when the oxygen slot is fully connected with the oxygen inlet pipe, the gas inlet pipe is not connected with the gas slot, and all the oxygen is ejected from the air blow pipe to avoid flying slag, and only laser cutting is performed at this time; comprehensive realization, whether it is laser cutting, flame cutting or laser flame composite cutting, can always blow the cutting position to avoid flying slag, this process only requires one oxygen inlet pipe to achieve, without unnecessary and complicated operations, it can be flexibly switched to always ensure the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the process of a low-power laser-flame composite cutting method for medium and thick plates of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of a laser cutting machine for a medium and thick plate low-power laser-flame composite cutting method of the present invention;

[0033] Figure 3 A schematic diagram of the dispersed structure of a laser cutting machine for a medium and thick plate low-power laser-flame composite cutting method of the present invention;

[0034] Figure 4 A schematic diagram of the cross-sectional structure of a laser cutting machine for a medium-thick plate low-power laser-flame composite cutting method of the present invention Figure 1 ;

[0035] Figure 5 It is a schematic diagram of the local structure of the fiber laser of a laser cutting machine for a low-power laser-flame composite cutting method of a medium-thick plate of the present invention;

[0036] Figure 6 A schematic diagram of the focusing tube structure of a laser cutting machine for a medium and thick plate low-power laser-flame composite cutting method of the present invention;

[0037] Figure 7 A schematic diagram of the gas pipeline structure on a laser cutting machine for a medium and thick plate low-power laser-flame composite cutting method of the present invention;

[0038] Figure 8 It is a schematic diagram of the structure of the blowing mechanism and the switching mechanism of a laser cutting machine in a low-power laser-flame composite cutting method for medium and thick plates of the present invention;

[0039] Fig. 9 It is a schematic diagram of the partial structure of the switching mechanism of a laser cutting machine in a low-power laser-flame composite cutting method for medium and thick plates of the present invention;

[0040] Fig.10 A schematic diagram of the gas pipeline in the laser cutting machine and the lower gas pipeline dispersion structure of a low-power laser flame composite cutting method for medium and thick plates of the present invention;

[0041] Fig.11 A schematic diagram of the cross-sectional structure of a laser cutting machine for a medium-thick plate low-power laser-flame composite cutting method of the present invention Figure 2 .

[0042] The reference numerals are as follows:

[0043] Fiber laser-100; laser body-110; laser channel-120; first external thread port-130; upper gas pipeline-200; oxygen inlet pipe-210; gas inlet pipe-220; second external thread port-230; rotating inner ring groove-240; focusing tube-300; closed ring-310; first internal thread port-320; focusing lens-330; second internal thread port-340; tube body-350; conical tube body-351; cylindrical tube body-352; control box-400 ; Limit plate-401; Mounting plate-410; Slide rod-420; Limit spring-430; Blowing mechanism-500; Oxygen ring box-510; Blowing pipe-520; Gear ring-530; Switching mechanism-600; Rotating ring-610; Gas groove-620; Oxygen groove-630; Oxygen groove-640; Gas outlet-650; Connecting pipe-660; Stepping motor-700; Middle gas pipeline-800; Rotating outer ring groove-810; Sliding groove-820; Lower gas pipeline-900. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0045] Although the steps in the present invention are arranged with numbers, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" used in this article involves and covers any and all possible combinations of one or more of the associated listed items.

[0046] Example

[0047] like Figures 1 to 11 As shown, a low-power laser-flame composite cutting method for medium and thick plates comprises the following steps:

[0048] S1. When the laser cutting machine is not cutting, the oxygen slot 630 and the oxygen slot 640 are not connected to the oxygen inlet pipe 210, and the gas slot 620 is not connected to the gas inlet pipe 220;

[0049] S2. When the laser cutting machine performs only laser cutting, the stepper motor 700 is controlled so that the oxygen inlet pipe 210 is connected only to the oxygen passage groove 630 or the oxygen inlet pipe 210 is connected only to the oxygen groove 640;

[0050] S3, when the laser cutting machine performs flame cutting or laser flame composite cutting, the oxygen inlet pipe 210 is connected to the oxygen slot 630 and the oxygen slot 640 at the same time by controlling the stepper motor 700, and the ratio of oxygen and fuel gas for flame cutting is adjusted;

[0051] S4. When the laser cutting machine needs to replace the focusing tube 300, rotate the focusing tube 300 to release the first internal threaded port 320 from the first external threaded port 130, and release the second internal threaded port 340 from the second external threaded port 230, and then replace the new focusing tube 300 to achieve quick replacement.

[0052] The present invention can quickly and flexibly switch between not performing laser cutting, performing only laser cutting, and performing flame cutting or laser-flame composite cutting. While achieving different cutting requirements, there is no need for complicated operations, and it can be achieved by only controlling the stepper motor 700; at the same time, it also ensures that the oxygen blowing state is always maintained when switching cutting, thereby quickly avoiding flying slag; and the present invention can also quickly replace the focusing tube 300, and only needs to rotate the focusing tube 300 for replacement, thereby improving the convenience of maintenance. The specific implementation of the flexible switching method and the method of replacing the focusing tube 300 will be described later.

[0053] Further, the laser cutting machine includes a fiber laser 100, the output end of the fiber laser 100 is fixedly connected to a focusing tube 300, and the outer portion of the focusing tube 300 is sequentially sleeved with an upper gas pipeline 200, a middle gas pipeline 800 and a lower gas pipeline 900 from top to bottom; the upper gas pipeline 200, the middle gas pipeline 800 and the lower gas pipeline 900 are sequentially fixedly connected;

[0054] The outer wall of the upper gas pipeline 200 is fixedly connected with an oxygen inlet pipe 210 and a fuel gas inlet pipe 220; the outer wall of the middle gas pipeline 800 is fixedly provided with a rotating outer ring groove 810, and the rotating outer ring groove 810 is rotatably connected with a blowing mechanism 500;

[0055] The inner side wall of the upper gas pipeline 200 is fixedly provided with a rotating inner ring groove 240 , and the oxygen intake pipe 210 and the fuel gas intake pipe 220 are both connected to the rotating inner ring groove 240 ; the rotating inner ring groove 240 is rotatably connected with a switching mechanism 600 .

[0056] The present invention realizes the oxygen supply for flame cutting and the blowing treatment of the cutting position to avoid flying slag through the cooperation of the blowing mechanism 500 and the switching mechanism 600. At the same time, only a single oxygen inlet pipe 210 is needed to realize two oxygen supplies and avoid oxygen occupying the laser pipeline. The structure and operation are simple while comprehensively avoiding the occurrence of cutting quality problems. The blowing mechanism 500 and the switching mechanism 600 will be described in detail later.

[0057] It is worth noting that the fuel gas can be acetylene, propane, natural gas, etc., and is not further limited here.

[0058] Furthermore, the blowing mechanism 500 includes an oxygen ring box 510, which is sleeved on the rotating outer ring groove 810 and fits with the rotating outer ring groove 810; a plurality of blowing pipes 520 are evenly fixed and connected at the bottom of the oxygen ring box 510; a sliding notch 820 is horizontally penetrated on the rotating outer ring groove 810, and the sliding notch 820 is connected with the inside of the middle gas pipeline 800;

[0059] A gear ring 530 is fixedly provided on the top of the oxygen ring box 510 in an annular direction, and a stepper motor 700 is fixedly installed on the outer side of the middle gas pipeline 800. The output end of the stepper motor 700 is meshed with the gear ring 530 through a gear.

[0060] It is worth noting that the stepper motor 700 is a mature existing technology, which can rotate at a fixed angle and perform forward and reverse rotation, etc. It is powered by an external power supply and will not be described in detail here.

[0061] Furthermore, the switching mechanism 600 includes a rotating ring 610, and the rotating ring 610 is in contact with the rotating inner ring groove 240; a gas through groove 620 and an oxygen through groove 630 are formed through the rotating ring 610, an oxygen groove 640 is formed on the outer wall of the rotating ring 610 and located on one side of the oxygen through groove 630, and an air outlet 650 is formed through the oxygen groove 640;

[0062] The inner wall of the oxygen ring box 510 is fixedly connected with a connecting pipe 660 , and the connecting pipe 660 passes through the sliding slot 820 and extends into the interior of the middle gas pipeline 800 ; the connecting pipe 660 is fixedly connected with the gas outlet 650 at one end away from the oxygen ring box 510 .

[0063] The present invention controls the stepper motor 700 to rotate the oxygen ring box 510 on the rotating outer ring groove 810, so that the oxygen inlet pipe 210 can be connected with the oxygen groove 630 and the oxygen groove 640 at the same time, wherein the oxygen entering the oxygen groove 630 is mixed with the fuel gas entering from the fuel gas groove 620, and after mixing, it is ejected through the channel between the lower gas pipeline 900 and the focusing tube 300 and ignited by the laser in the focusing tube 300 for flame cutting; at the same time, the oxygen entering the oxygen groove 640 enters the oxygen ring box 510 from the connecting pipe 660, and then is blown out through multiple blowing pipes 520, thereby avoiding the problem of iron slag splashing generated by cutting affecting the lower gas pipeline 900 and causing equipment damage. In this way, only a single oxygen inlet pipe 210 is needed to realize two oxygen supply methods and avoid oxygen occupying the laser pipeline, avoiding the problem of oxygen causing laser scattering and other interference with laser output leading to a decrease in laser quality. The structure and operation are simple, and cutting quality problems are comprehensively avoided.

[0064] Furthermore, when the oxygen groove 630 is fully connected with the oxygen inlet pipe 210, the gas inlet pipe 220 is not connected with the gas groove 620; when the rotating ring 610 rotates to make the oxygen groove 630 and the oxygen tank 640 connected with the oxygen inlet pipe 210, the gas inlet pipe 220 is connected with the gas groove 620; when the oxygen tank 640 is fully connected with the oxygen inlet pipe 210, the gas inlet pipe 220 is not connected with the gas groove 620.

[0065] The present invention can not only accurately control the ratio of oxygen and fuel gas in flame cutting to ensure full combustion of fuel gas, but also ensure that oxygen is always blown out from the end of the lower gas pipeline 900. No matter laser cutting, flame cutting or laser flame composite cutting, the cutting position can always be blown to avoid flying slag, and the equipment safety can be always guaranteed by flexible switching without unnecessary complicated operations. Specifically, when the rotating ring 610 rotates to make the oxygen groove 630 and the oxygen groove 640 connected to the oxygen inlet pipe 210, the fuel gas inlet pipe 220 is connected to the fuel gas groove 620. At this time, the oxygen ring box 510 is continued to rotate on the rotating outer ring groove 810 through the stepper motor 700. The rotating ring 610 rotates under the fixing action of the connecting pipe 660. At this time, the caliber of the connection between the oxygen groove 630 and the oxygen inlet pipe 210 and the caliber of the connection between the fuel gas groove 620 and the fuel gas inlet pipe 220 change in the opposite direction, that is, the ratio of oxygen and fuel gas mixture can be quickly adjusted, and the color of the combustion flame can be quickly and accurately controlled to ensure the combustion. At the same time, when the oxygen slot 630 is fully connected with the oxygen inlet pipe 210, the fuel gas inlet pipe 220 is not connected with the fuel gas slot 620, and all the oxygen is ejected from between the lower gas pipeline 900 and the focusing tube 300 to avoid flying slag. At this time, only laser cutting is performed; when the oxygen slot 630 and the oxygen slot 640 are both connected with the oxygen inlet pipe 210, the fuel gas inlet pipe 220 is connected with the fuel gas slot 620, and oxygen is ejected through the blowing pipe 520 to avoid flying slag. At this time, it can be flame cutting or Laser flame composite cutting; when the oxygen slot 640 is fully connected with the oxygen inlet pipe 210, the gas inlet pipe 220 is not connected with the gas through slot 620, and all the oxygen is ejected from the blowing pipe 520 to avoid flying slag. At this time, only laser cutting is performed; whether it is laser cutting, flame cutting or laser flame composite cutting, the cutting position can always be blown to avoid flying slag. This process only requires one oxygen inlet pipe 210 to achieve, and can be flexibly switched without unnecessary complicated operations to always ensure equipment safety.

[0066] Furthermore, the focusing tube 300 includes a closed ring 310, a focusing lens 330 is fixedly connected to the middle of the closed ring 310, a first internal threaded port 320 is fixedly provided on the periphery of the top of the closed ring 310, and a second internal threaded port 340 is fixedly provided on the periphery of the bottom of the closed ring 310; a tube body 350 is provided at the bottom of the closed ring 310, and the tube body 350 includes a conical tube body 351 and a cylindrical tube body 352 that are fixedly connected to each other; the large-diameter end of the conical tube body 351 is fixedly connected to the bottom of the closed ring 310.

[0067] It is worth mentioning that the condenser 330 focuses the laser, thereby increasing the energy density of the laser beam, which is beneficial to increasing the cutting speed, which will not be described in detail here.

[0068] Furthermore, the fiber laser 100 includes a laser body 110, an output end of the laser body 110 is fixedly connected to a laser channel 120, an end of the laser channel 120 away from the laser body 110 is fixedly provided with a first external threaded port 130, and the first external threaded port 130 is threadedly connected to a first internal threaded port 320;

[0069] A second external threaded port 230 is fixedly disposed at one end of the upper gas pipeline 200 close to the optical fiber laser 100 , and the second external threaded port 230 is threadedly connected to the second internal threaded port 340 .

[0070] The present invention realizes the detachable device through the structural design of the focusing tube 300, thereby facilitating the replacement of consumable parts such as the focusing tube 300 and improving maintenance efficiency.

[0071] Furthermore, the upper end of the lower gas pipeline 900 is a cylindrical structure, and the lower end of the lower gas pipeline 900 is a conical structure.

[0072] Furthermore, the end of the cylindrical tube body 352 does not extend out of the gas outlet end of the lower gas pipeline 900; the cylindrical tube body 352 and the lower gas pipeline 900 are coaxially arranged.

[0073] The present invention further improves the cutting quality and the cutting efficiency of the laser-flame composite cutting through the structural design of the coaxial arrangement of the cylindrical tube body 352 and the lower gas pipeline 900, thereby being suitable for the cutting of medium and thick plates.

[0074] Furthermore, the upper gas pipeline 200, the middle gas pipeline 800 and the lower gas pipeline 900 are fixedly connected in sequence in a detachable fixed connection, which further facilitates the disassembly and assembly of the device.

[0075] Furthermore, a control box 400 is fixedly installed on one side of the fiber laser 100, and limit plates 401 are fixedly provided at the upper and lower ends of the control box 400 and the side away from the fiber laser 100, and two slide bars 420 are fixedly connected between the two limit plates 401; a mounting plate 410 is slidably connected to the two slide bars 420, and screw holes are provided at both ends of the mounting plate 410; a limit spring 430 is sleeved on the slide bar 420, and the two ends of the limit spring 430 are respectively fixedly connected to the mounting plate 410 and the limit plate 401 below.

[0076] When the focusing tube 300 needs to be replaced, the present invention only needs to rotate the focusing tube 300. Due to the screw connection relationship between the first internal threaded port 320 and the first external threaded port 130, and the screw connection relationship between the second internal threaded port 340 and the second external threaded port 230, the rotation of the focusing tube 300 can release the screw connection between the first internal threaded port 320 and the first external threaded port 130, and at the same time, the screw connection between the second internal threaded port 340 and the second external threaded port 230. During the rotation process, since the upper mounting plate 410 is fixed on the external lathe, and the lower oxygen inlet pipe 210 and the fuel gas inlet pipe 220 are connected to the external gas pipeline, they are relatively difficult to move. After the focusing tube 300 is rotated, the control box 400 will move upward relative to the mounting plate 410, so that the focusing tube 300 can be quickly unscrewed, and then the focusing tube 300 can be quickly replaced through subsequent dislocation, thereby improving the convenience of maintenance.

[0077] It is worth mentioning that a PLC controller and other structures can be set inside the control box 400 to facilitate the control of the stepper motor 700, the fiber laser 100, etc. At the same time, the mounting plate 410 can be installed and fixed on the lathe to facilitate movement; and the thread directions of the first internal threaded port 320 and the second internal threaded port 340 at the upper and lower ends of the rotating focusing tube 300 can be flexibly set, which are all conventional settings and are not described in detail here.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and changes without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A low-power laser-flame composite cutting method for medium and thick plates, characterized in that: The steps include: S1. When the laser cutting machine is not cutting, the oxygen slot (630) and the oxygen slot (640) are not connected to the oxygen inlet pipe (210), and the fuel gas slot (620) is not connected to the fuel gas inlet pipe (220); S2. When the laser cutting machine is only performing laser cutting, the stepping motor (700) is controlled so that the oxygen inlet pipe (210) is only connected to the oxygen passage groove (630) or the oxygen inlet pipe (210) is only connected to the oxygen groove (640); S3, when the laser cutting machine performs flame cutting or laser flame composite cutting, the stepper motor (700) is controlled to connect the oxygen inlet pipe (210) with the oxygen passage groove (630) and the oxygen groove (640) at the same time, and the ratio of oxygen and fuel gas for flame cutting is adjusted; S4. When the laser cutting machine needs to replace the focusing tube (300), the focusing tube (300) is rotated to release the first internal threaded port (320) from the first external threaded port (130), and the second internal threaded port (340) from the second external threaded port (230) is released from the threaded connection, and then a new focusing tube (300) is replaced to achieve rapid replacement.

2. According to claim 1, a low-power laser-flame composite cutting method for medium and thick plates is characterized in that: The laser cutting machine comprises a fiber laser (100), the output end of the fiber laser (100) is fixedly connected to a focusing tube (300), and the outside of the focusing tube (300) is sequentially sleeved with an upper gas pipeline (200), a middle gas pipeline (800), and a lower gas pipeline (900) from top to bottom; the upper gas pipeline (200), the middle gas pipeline (800), and the lower gas pipeline (900) are sequentially fixedly connected; An oxygen inlet pipe (210) and a fuel gas inlet pipe (220) are fixedly connected to each other on both sides of the outer wall of the upper gas pipeline (200); a rotating outer ring groove (810) is fixedly provided on the outer wall of the middle gas pipeline (800), and a blowing mechanism (500) is rotatably connected to the rotating outer ring groove (810); A rotating inner ring groove (240) is fixedly provided on the inner side wall of the upper gas pipeline (200); the oxygen intake pipe (210) and the fuel gas intake pipe (220) are both in communication with the rotating inner ring groove (240); and a switching mechanism (600) is rotatably connected to the rotating inner ring groove (240).

3. According to claim 2, a low-power laser-flame composite cutting method for medium and thick plates is characterized in that: The blowing mechanism (500) comprises an oxygen ring box (510), which is sleeved on the rotating outer ring groove (810) and fits with the rotating outer ring groove (810); a plurality of blowing pipes (520) are evenly fixed and connected to the bottom of the oxygen ring box (510); a sliding notch (820) is transversely penetrated on the rotating outer ring groove (810), and the sliding notch (820) is connected to the inside of the middle gas pipeline (800); A gear ring (530) is fixedly provided in an annular direction on the top of the oxygen ring box (510), and a stepper motor (700) is fixedly installed on the outer side of the middle gas pipeline (800), and the output end of the stepper motor (700) is meshed with the gear ring (530) through a gear.

4. A low-power laser-flame composite cutting method for medium and thick plates according to claim 3, characterized in that: The switching mechanism (600) comprises a rotating ring (610), wherein the rotating ring (610) is in contact with the rotating inner ring groove (240); a gas through groove (620) and an oxygen through groove (630) are provided through the rotating ring (610); an oxygen groove (640) is provided on the outer wall of the rotating ring (610) and located on one side of the oxygen through groove (630); and an air outlet (650) is provided through the interior of the oxygen groove (640); The inner wall of the oxygen ring box (510) is fixedly connected with a connecting pipe (660), and the connecting pipe (660) passes through the sliding slot (820) and extends into the interior of the middle gas pipeline (800); the connecting pipe (660) and one end away from the oxygen ring box (510) are fixedly connected with the gas outlet (650).

5. A low-power laser-flame composite cutting method for medium and thick plates according to claim 4, characterized in that: When the oxygen through groove (630) is completely connected to the oxygen intake pipe (210), the fuel gas intake pipe (220) is not connected to the fuel gas through groove (620); when the rotating ring (610) rotates to make the oxygen through groove (630) and the oxygen groove (640) both connected to the oxygen intake pipe (210), the fuel gas intake pipe (220) is connected to the fuel gas through groove (620); when the oxygen groove (640) is completely connected to the oxygen intake pipe (210), the fuel gas intake pipe (220) is not connected to the fuel gas through groove (620).

6. A low-power laser-flame composite cutting method for medium and thick plates according to claim 2, characterized in that: The focusing tube (300) comprises a closed ring (310), a focusing lens (330) is fixedly connected to the middle of the closed ring (310), a first internal threaded port (320) is fixedly provided on the periphery of the top of the closed ring (310), and a second internal threaded port (340) is fixedly provided on the periphery of the bottom of the closed ring (310); a tube body (350) is provided at the bottom of the closed ring (310), and the tube body (350) comprises a conical tube body (351) and a cylindrical tube body (352) which are fixedly connected to each other; and the large-diameter end of the conical tube body (351) is fixedly connected to the bottom of the closed ring (310).

7. A low-power laser-flame composite cutting method for medium and thick plates according to claim 6, characterized in that: The optical fiber laser (100) comprises a laser body (110), the output end of the laser body (110) is fixedly connected to a laser channel (120), an end of the laser channel (120) away from the laser body (110) is fixedly provided with a first external threaded port (130), and the first external threaded port (130) is threadedly connected to a first internal threaded port (320); A second external threaded port (230) is fixedly provided on one end of the upper gas pipeline (200) close to the optical fiber laser (100), and the second external threaded port (230) is threadedly connected to the second internal threaded port (340).

8. A low-power laser-flame composite cutting method for medium and thick plates according to claim 6, characterized in that: The upper end of the lower gas pipeline (900) is a cylindrical structure, and the lower end of the lower gas pipeline (900) is a conical structure.

9. A low-power laser-flame composite cutting method for medium and thick plates according to claim 6, characterized in that: The end of the cylindrical tube body (352) does not extend beyond the gas outlet end of the lower gas pipeline (900); the cylindrical tube body (352) and the lower gas pipeline (900) are coaxially arranged; and the upper gas pipeline (200), the middle gas pipeline (800) and the lower gas pipeline (900) are fixedly connected in sequence in a detachable fixed connection.

10. The low-power laser-flame composite cutting method for medium and thick plates according to claim 2, characterized in that: A control box (400) is fixedly installed on one side of the optical fiber laser (100), and limit plates (401) are fixedly installed on the upper and lower ends of the control box (400) and away from the optical fiber laser (100), and two sliding rods (420) are fixedly connected between the two limit plates (401); a mounting plate (410) is slidably connected to the two sliding rods (420), and screw holes are opened at both ends of the mounting plate (410); a limit spring (430) is sleeved on the sliding rod (420), and the two ends of the limit spring (430) are respectively fixedly connected to the mounting plate (410) and the limit plate (401) below.

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