Laser flame hybrid cutting head

Abstract

The application discloses a laser flame composite cutting head, which comprises a body, the body is provided with a light beam passage for the laser to pass through along an axis, a preheating head is arranged at the lower end of the body, the preheating head is provided with a through hole corresponding to the light beam passage and coaxially arranged with the light beam passage, a ring-shaped preheating cavity is arranged at the bottom of the preheating head, a lifting unit is arranged on the body and connected with the preheating head, the lifting unit is used for driving the preheating head to lift and abut against the surface of a workpiece, a gas supply unit is connected with the preheating cavity and used for conveying combustion gas to the preheating cavity, the preheating cavity is arranged in cooperation with the lifting of the lifting unit, the sprayed preheating flame can be hidden, dust flying caused by flame leakage can be avoided, the hidden preheating flame can also avoid interference to the laser beam, the machining precision during subsequent laser cutting is ensured, and the ring-shaped preheating cavity can achieve good preheating effect on the machining position.

Description

Technical Field

[0001] This invention relates to the field of flame laser cutting technology, and more specifically to a laser-flame composite cutting head. Background Technology

[0002] Flame laser cutting refers to a method of preheating the cutting area with a flame in conjunction with a laser to achieve efficient cutting.

[0003] Current flame preheating methods mostly use fixed flame nozzles placed near the laser head, which spray flames at an angle towards the cutting position to achieve the preheating effect. This method has the following drawbacks: Because the method of flame jetting causes dust to fly in the environment, and the flame itself can also interfere with the laser beam, it will have an adverse effect on laser processing.

[0004] Flame jetting causes the temperature of the workpiece area to rise, which can easily lead to thermal deformation when machining some sheet metal parts, thus affecting machining accuracy. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a laser-flame composite cutting head that can significantly reduce dust caused by flame jet, avoid interference with the laser beam, and constrain the workpiece to reduce thermal deformation and improve processing accuracy and quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A laser-flame composite cutting head includes a body, the body having a beam path along an axis for laser to pass through, a preheating head at the lower end of the body, the preheating head having a through hole corresponding to the beam path and coaxially arranged with the beam path, an annular preheating cavity at the bottom of the preheating head, and a lifting unit on the body, the lifting unit being connected to the preheating head, the lifting unit being used to drive the preheating head to rise and fall and to contact the workpiece surface. A gas supply unit is connected to the preheating chamber and is used to supply combustion gas to the preheating chamber.

[0007] As a further improvement of the present invention, the lifting unit includes a control air path, a connecting rod is connected to the upper end of the preheating head, and a control cavity is provided on the body corresponding to the connecting rod. The connecting rod extends into the control cavity and slides in a sealed manner with the control cavity. The control air path is connected to the control cavity and is used to draw / suppli air to the control cavity to control the connecting rod to retract / extend relative to the control cavity.

[0008] As a further improvement of the present invention, the upper end of the preheating head forms an annular rectifier cavity, the bottom of the rectifier cavity has a plurality of air outlets communicating with the preheating cavity, and a baffle is provided inside the rectifier cavity to cut off the rectifier cavity and guide the airflow inside the rectifier cavity to flow in one direction.

[0009] As a further improvement of the present invention, a sealing unit is provided in the rectifier cavity. The sealing unit is used to seal part of the air outlet. The sealing unit includes a sealing plate. The sealing plate has a through hole corresponding to the air outlet. A driving device is provided on the preheating head. The driving device is connected to the sealing plate and drives the sealing plate to rotate along the rectifier cavity to adjust the overlap range of the through hole and the air outlet.

[0010] As a further improvement of the present invention, the driving device is a motor, a rotating ring is provided in the rectifier cavity, the inner side of the rotating ring is fixedly connected to the sealing plate, the outer side of the rotating ring is provided with meshing teeth, and the output end of the motor is provided with a driving gear and meshes with the meshing teeth through the driving gear.

[0011] As a further improvement of the present invention, the bottom of the preheating head is provided with a reinforcing surface in the circumferential direction.

[0012] As a further improvement of the present invention, the preheating head sidewall is provided with a plurality of pressure regulating holes communicating with the preheating chamber, and the preheating chamber adjusts the air pressure to be consistent with the outside air through the pressure regulating holes.

[0013] The beneficial effects of this invention are: 1. By setting up a preheating chamber and using the lifting unit to raise and lower, the sprayed preheating flame can be concealed to avoid dust flying due to flame leakage. At the same time, the concealed preheating flame can also avoid interfering with the laser beam, thereby ensuring the processing accuracy during subsequent laser cutting. In addition, the annular preheating chamber can provide a good preheating effect on the processing position. 2. The lifting unit drives the preheating head to contact the workpiece surface, which not only achieves concealed flame spraying but also fixes the workpiece surface, thereby greatly reducing the thermal deformation caused by the workpiece being heated and ensuring the processing quality of the workpiece. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the overall installation of the present invention; Figure 2 This is a schematic cross-sectional view of the rectifier cavity installation of the present invention.

[0015] Reference numerals: 1. Body; 2. Beam path; 3. Preheating head; 4. Preheating chamber; 5. Lifting unit; 6. Air supply unit; 7. Control air path; 8. Connecting rod; 9. Control chamber; 10. Rectifying chamber; 11. Air outlet; 12. Stop block; 13. Sealing plate; 14. Through hole; 15. Drive device; 16. Rotating ring; 17. Meshing teeth; 18. Drive gear; 19. Reinforcing surface; 20. Pressure regulating hole. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0017] like Figure 1-2 As shown, a laser flame composite cutting head includes a body 1. The body 1 has a beam path 2 along its axis for laser to pass through. A preheating head 3 is provided at the lower end of the body 1. The preheating head 3 has a through hole corresponding to the beam path 2 and is arranged coaxially with the beam path 2. An annular preheating cavity 4 is provided at the bottom of the preheating head 3. A lifting unit 5 is provided on the body 1. The lifting unit 5 is connected to the preheating head 3 and is used to drive the preheating head 3 to rise and fall and to contact the workpiece surface.

[0018] Preferably, it also includes a gas supply unit 6, which is connected to the preheating chamber 4 and is used to supply combustion gas to the preheating chamber 4.

[0019] Preferably, it also includes an ignition device, which is provided in the preheating chamber 4. The ignition device can be any ignition method that can generate an electric arc in the prior art, and will not be described in detail here.

[0020] During use, the lifting unit 5 drives the preheating head 3 to descend, so that the lower end of the preheating head 3 comes into contact with the surface of the workpiece. The gas supply unit 6 then supplies combustion gas to the preheating chamber 4 to preheat the annular periphery of the processing area. At the same time, the laser beam is output through the beam path 2 to cooperate with the preheating to complete the cutting of the processing area.

[0021] Because of the connection between the preheating head 3 and the body 1, the preheating head 3 can move together with the body 1, thereby ensuring the preheating effect during the processing. At the same time, due to the contact between the preheating head 3 and the workpiece, the thermal deformation of the workpiece can be restrained, thereby greatly reducing thermal deformation.

[0022] Because the preheating head 3 is in contact with the workpiece, the flame is located inside the preheating chamber 4 during preheating. This significantly reduces airflow during preheating to prevent dust from flying around the processing environment and affecting it. At the same time, the preheating chamber 4 also isolates the flame, preventing it from adversely affecting the laser beam and ensuring the cutting quality of the laser beam itself, thereby improving the overall processing accuracy.

[0023] Preferably, the lifting unit 5 includes a control air passage 7, a connecting rod 8 is connected to the upper end of the preheating head 3, and a control cavity 9 is provided on the body 1 corresponding to the connecting rod 8. The connecting rod 8 extends into the control cavity 9 and slides in a sealed manner with the control cavity 9. The control air passage 7 is connected to the control cavity 9 and is used to draw / suppli air to the control cavity 9 to control the connecting rod 8 to retract / extend relative to the control cavity 9.

[0024] During use, the extension and retraction position of the connecting rod 8 can be controlled by controlling the air circuit 7, thereby adapting to different laser processing height requirements.

[0025] Preferably, the upper end of the preheating head 3 forms an annular rectifier cavity 10, and the bottom of the rectifier cavity 10 is provided with a plurality of air outlets 11 that communicate with the preheating cavity 4. The rectifier cavity 10 is provided with a baffle 12, which is used to cut off the rectifier cavity 10 to guide the airflow in the rectifier cavity 10 to flow in one direction.

[0026] The rectifier cavity 10 and the baffle 12 enable the rectification of the combustion gas and the uniform output of the combustion gas to the preheating cavity 4, thereby ensuring the uniform distribution of the flame in the preheating cavity 4 and thus ensuring the preheating effect on the annular area of ​​the processing zone.

[0027] Preferably, since the laser's movement direction is fixed, in order to make the preheating of the processing area closer to the laser's movement direction, so as to concentrate the heat and improve the preheating effect, a sealing unit is provided in the rectifier cavity 10. The sealing unit is used to seal part of the vent 11. The sealing unit includes a sealing plate 13. The sealing plate 13 has a through hole 14 corresponding to the vent 11. A driving device 15 is provided on the preheating head 3. The driving device 15 is connected to the sealing plate 13 and drives the sealing plate 13 to move along the rectifier cavity 10 to adjust the overlap range of the through hole 14 and the vent 11.

[0028] During use, the position of the sealing plate 13 is adjusted by the driving device 15, thereby achieving the sealing effect of the air outlet 11 at different positions, so that the air outlet position is more concentrated, thereby improving the preheating effect. At the same time, the through hole 14 can be adjusted to fully overlap with the air outlet 11 to achieve uniform air outlet in the circumference, so as to adapt to different usage effects.

[0029] Preferably, the driving device 15 is a motor, and a rotating ring 16 is provided inside the rectifier cavity 10. The inner side of the rotating ring 16 is fixedly connected to the sealing plate 13, and the outer side of the rotating ring 16 is provided with meshing teeth 17. The output end of the motor is provided with a driving gear 18, which meshes with the meshing teeth 17.

[0030] The combination of motor drive and gear meshing ensures precise control of the sealing plate 13 position, while also making the overall structure more compact and reducing the failure rate.

[0031] Preferably, the bottom of the preheating head 3 is provided with a reinforcing surface 19 in the circumferential direction.

[0032] By reinforcing the surface 19, the constraint effect on the bottom of the preheating head 3 can be enhanced, thereby further reducing the thermal deformation generated on the workpiece surface.

[0033] Preferably, the preheating head 3 has multiple pressure regulating holes 20 circumferentially arranged on its side wall, which are connected to the preheating chamber 4. The preheating chamber 4 adjusts the air pressure to be consistent with the outside air pressure through the pressure regulating holes 20.

[0034] The pressure regulating hole 20 can prevent unstable contact between the preheating head 3 and the workpiece surface caused by excessive pressure in the preheating chamber 4, thereby improving the overall stability.

[0035] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A laser-flame composite cutting head, characterized in that: Includes a body (1), the body (1) having a beam path (2) for laser to pass through along the axis, a preheating head (3) at the lower end of the body (1), the preheating head (3) having a through hole corresponding to the beam path (2) and being coaxially arranged with the beam path (2), the preheating head (3) having an annular preheating cavity (4) at the bottom, and a lifting unit (5) on the body (1), the lifting unit (5) being connected to the preheating head (3), the lifting unit (5) being used to drive the preheating head (3) to rise and fall and to contact the workpiece surface; Gas supply unit (6), which is connected to the preheating chamber (4) and is used to supply combustion gas to the preheating chamber (4); The upper end of the preheating head (3) forms an annular rectifier cavity (10). The bottom of the rectifier cavity (10) is provided with multiple air outlets (11) that communicate with the preheating cavity (4). The rectifier cavity (10) is provided with a baffle (12). The baffle (12) is used to cut off the rectifier cavity (10) to guide the airflow in the rectifier cavity (10) to flow in one direction. The rectifier cavity (10) is provided with a sealing unit, which is used to block part of the air outlet (11). The sealing unit includes a sealing plate (13). The sealing plate (13) is provided with a through hole (14) corresponding to the air outlet (11). The preheating head (3) is provided with a driving device (15). The driving device (15) is connected to the sealing plate (13) and drives the sealing plate (13) to rotate along the rectifier cavity (10) to adjust the overlap range of the through hole (14) and the air outlet (11).

2. The laser-flame composite cutting head according to claim 1, characterized in that: The lifting unit (5) includes a control air passage (7), and a connecting rod (8) is connected to the upper end of the preheating head (3). The body (1) is provided with a control cavity (9) corresponding to the connecting rod (8). The connecting rod (8) extends into the control cavity (9) and slides in a sealed manner with the control cavity (9). The control air passage (7) is connected to the control cavity (9). The control air passage (7) is used to draw / suppli air to the control cavity (9) to control the connecting rod (8) to retract / extend relative to the control cavity (9).

3. The laser-flame composite cutting head according to claim 1, characterized in that: The driving device (15) is a motor. A rotating ring (16) is provided inside the rectifier cavity (10). The inner side of the rotating ring (16) is fixedly connected to the sealing plate (13). The outer side of the rotating ring (16) is provided with meshing teeth (17). The output end of the motor is provided with a drive gear (18) and meshes with the meshing teeth (17) through the drive gear (18).

4. The laser-flame composite cutting head according to claim 1, characterized in that: The preheating head (3) has a reinforcing surface (19) circumferentially located at its bottom.

5. A laser-flame composite cutting head according to claim 1, characterized in that: The preheating head (3) has multiple pressure regulating holes (20) circumferentially arranged on its side wall, which are connected to the preheating chamber (4). The preheating chamber (4) adjusts its air pressure to be consistent with the outside air pressure through the pressure regulating holes (20).

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