Laser cutting head

Abstract

The utility model relates to the technical field of laser cutting heads, and provides a laser cutting head which comprises a laser head, the laser head is fixedly installed at the outlet end of a lens device, a laser channel is formed in the inner side of the laser head, a protective gas distribution mechanism is arranged on the inner side of the laser channel, and the protective gas distribution mechanism comprises an inner shell concentric with the laser head. The inner shell is located at one end of the laser channel, a gas inlet piece used for guiding protective gas into the inner shell is arranged on the outer side of the inner shell, and a gas guiding piece used for guiding the protective gas out of the inner shell is arranged at one end of the inner shell. The protective gas can be guided out of the laser head in parallel with the laser beam through the gas guide piece, and the problem that in the prior art, the protective gas is guided in the direction perpendicular to the laser beam, interference is caused to the laser beam, and workpiece cutting is affected is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting heads, in particular to a laser cutting head. Background Art

[0002] The laser cutting machine uses the energy released when the laser beam hits the surface of the workpiece to melt the workpiece to achieve the purpose of cutting. The existing laser cutting machine includes a laser, multiple reflectors and a laser cutting head. The laser beam emitted by the laser is reflected by multiple reflectors and then passes through the cavity of the laser cutting head to reach the cutting workpiece, thereby cutting the workpiece. The laser cutting machine is also connected to a protective gas, and when laser cutting is performed, the protective gas also flows out through the cavity of the laser cutting head to blow away the slag generated by the cutting, and at the same time, the protective gas isolates the incision oxygen to prevent combustion.

[0003] After searching, the Chinese patent publication number CN211759277U discloses "a laser cutting head, including a focusing tube, a cutting nozzle arranged at the lower end of the focusing tube, a head arranged at the bottom end of the cutting nozzle and an air intake pipe connected to one side of the cutting nozzle, the cutting nozzle is a conical tube extending from top to bottom in a gradually narrowing shape, a conical light-transmitting hole is formed inside the cutting nozzle, the light-transmitting hole passes through the upper and lower ends of the cutting nozzle, the inner circumference of the cutting nozzle is provided with a guide rib, the guide rib protrudes from the inner surface of the cutting nozzle, and extends in a spiral shape from top to bottom along the inner wall of the cutting nozzle, the end of the guide rib near the top of the cutting nozzle is a starting end, and the air intake pipe is correspondingly arranged above the starting end of the guide rib".

[0004] The above patent introduces the shielding gas through the "inlet pipe", then passes through the "guide plate" along the starting end direction of the "guide rib" into the inside of the "cutting nozzle", and finally is discharged from the "cutting nozzle" to blow away the slag generated by the cutting; however, the shielding gas directly enters the cavity of the laser cutting head in a horizontal direction perpendicular to the laser beam, which is easy to interfere with the laser beam, and the dust, impurities and moisture remaining in the cavity of the laser cutting head are blown by the shielding gas to fly around the cavity of the laser cutting head, which disturbs and blocks the laser beam, so that the cutting of the workpiece is affected. Utility Model Content

[0005] The utility model provides a laser cutting head, which solves the problem in the prior art that the shielding gas is introduced along a direction perpendicular to the laser beam, causing interference with the laser beam and affecting the cutting of the workpiece.

[0006] The technical solution of the utility model is as follows: a laser cutting head, comprising a laser head, the laser head is fixedly mounted on the outlet end of a lens device, a laser channel is opened on the inner side of the laser head, a protective gas distribution mechanism is arranged on the inner side of the laser channel, the protective gas distribution mechanism comprises an inner shell arranged concentrically with the laser head, the inner shell is located at one end of the laser channel, an air inlet member for introducing protective gas into the inner shell is arranged on the outer side of the inner shell, and an air guide member for leading the protective gas out along the axial direction of the inner shell is arranged at one end of the inner shell.

[0007] Preferably, an outlet port is provided at the outlet end of the laser head, and the outlet port is arranged concentrically with the laser channel.

[0008] Preferably, the inner shell is a cylindrical structure, and laser guide holes are provided through the center positions of both ends of the inner shell, and the laser guide holes are arranged concentrically with the outlet port.

[0009] Preferably, a protective tube is fixedly connected to the center position of one end of the inner shell, and the protective tube passes through the two laser guide holes and extends to the inner side of the outlet port.

[0010] Preferably, the protection tube is concentrically arranged with the outlet port, and the outer diameter of the protection tube is smaller than the inner diameter of the outlet port.

[0011] Preferably, the air intake member comprises a mounting seat, the mounting seat is fixedly mounted on one end of the outer side of the laser head, an air intake pipe is fixedly connected to the middle of the outer side of the mounting seat, and the air intake pipe penetrates the inner wall of the laser head and extends to the inside of the inner shell.

[0012] Preferably, the air inlet member further comprises an air valve, which is fixedly mounted at the inlet end of the air inlet pipe, and the inlet end of the air valve is externally connected to a protective gas supply device via a conduit.

[0013] Preferably, the air guide member includes a conical air guide cover 1, a small-diameter end of the conical air guide cover 1 is fixedly connected to one end of the inner shell, and a conical air guide cover 2 is arranged on the inner side of the conical air guide cover 1, and a small-diameter end of the conical air guide cover 2 is fixedly connected to one end of the inner shell.

[0014] Preferably, the first conical air guide cover and the second conical air guide cover are both centrally arranged with the inner shell.

[0015] Preferably, the outer sides of the conical air guide cover 1 and the conical air guide cover 2 are each provided with a plurality of air guide holes 1, and the plurality of air guide holes 1 all penetrate the side wall of the inner shell and are distributed at equal angles around the inner shell, and the inner side of the conical air guide cover 2 is provided with a plurality of air guide holes 2, and the plurality of air guide holes 2 all penetrate the side wall of the inner shell and are distributed at equal angles around the inner shell.

[0016] Technical effects and advantages of the utility model:

[0017] 1. The protective gas is introduced vertically into the inner shell through the air inlet, and then the protective gas is discharged along the axis direction of the inner shell through the air guide. Since the inner shell and the laser head are concentrically arranged, the protective gas discharged by the air guide is parallel to the laser beam and discharged from the laser head, which can avoid the problem that the vertical introduction of the protective gas interferes with the laser beam and affects the cutting of the workpiece;

[0018] 2. The laser beam can be protected by the protective tube to prevent dust and impurities inside the laser channel from disturbing and blocking the laser beam. Since the outer diameter of the protective tube is smaller than the inner diameter of the outlet port, there is a gap between the inner wall of the outlet port and the protective tube. The protective gas is discharged through the gap between the two, which will not affect the blowing of the cutting slag by the protective gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic structural diagram of a laser cutting head.

[0020] Figure 2 It is a structural schematic diagram of the protective gas distribution mechanism of the utility model.

[0021] Figure 3 It is a partial structural schematic diagram of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the air intake component of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the air guide member of the utility model.

[0024] The accompanying drawings are marked as follows: 2, laser head; 21, laser channel; 22, outlet port; 3, protective gas distribution mechanism; 31, inner shell; 32, air inlet; 321, mounting seat; 322, air inlet pipe; 323, air valve; 33, laser guide hole; 34, protective tube; 35, air guide; 351, conical guide cover one; 352, conical guide cover two; 353, air guide hole one; 354, air guide hole two. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1 - Figure 3The utility model provides a laser cutting head, including a laser head 2, which is fixedly installed at the outlet end of a lens device, a laser channel 21 is provided on the inner side of the laser head 2, a protective gas distribution mechanism 3 is provided on the inner side of the laser channel 21, the protective gas distribution mechanism 3 includes an inner shell 31 which is arranged concentrically with the laser head 2, the inner shell 31 is located at one end of the laser channel 21, an air inlet 32 ​​for introducing protective gas into the inner shell 31 is provided on the outer side of the inner shell 31, an air guide 35 for leading the protective gas along the axial direction of the inner shell 31 is provided at one end of the inner shell 31, an outlet port 22 is provided at the outlet end of the laser head 2, and the outlet port 22 is arranged concentrically with the laser channel 21. The shielding gas is vertically introduced into the inner shell 31 through the air inlet 32, and then discharged along the axial direction of the inner shell 31 through the air guide 35. Since the inner shell 31 is concentrically arranged with the laser head 2, the shielding gas discharged by the air guide 35 is discharged from the laser head 2 in parallel with the laser beam, thereby avoiding the problem of interference of the vertical introduction of the shielding gas with the laser beam and affecting the cutting of the workpiece.

[0027] The inner shell 31 is a cylindrical structure, and laser guide holes 33 are provided at the center positions of both ends of the inner shell 31, and the laser guide holes 33 are arranged concentrically with the outlet port 22. A protective tube 34 is fixedly connected to the center position of one end of the inner shell 31, and the protective tube 34 passes through the two laser guide holes 33 and extends to the inner side of the outlet port 22. The protective tube 34 is arranged concentrically with the outlet port 22, and the outer diameter of the protective tube 34 is smaller than the inner diameter of the outlet port 22. The protective tube 34 can protect the laser beam to prevent dust and impurities inside the laser channel 21 from disturbing and blocking the laser beam. Since the outer diameter of the protective tube 34 is smaller than the inner diameter of the outlet port 22, there is a gap between the inner wall of the outlet port 22 and the protective tube 34, and the shielding gas is discharged through the gap between the two, which will not affect the shielding gas blowing off the cutting slag.

[0028] Reference Figure 4 The air inlet member 32 includes a mounting seat 321, which is fixedly mounted on one end of the outer side of the laser head 2. An air inlet pipe 322 is fixedly connected to the middle of the outer side of the mounting seat 321. The air inlet pipe 322 penetrates the inner wall of the laser head 2 and extends to the inner shell 31. An air valve 323 is fixedly mounted on the inlet end of the air inlet pipe 322. The inlet end of the air valve 323 is externally connected to a protective gas supply device through a conduit. The air valve 323 can control the flow rate of the protective gas introduced into the air inlet pipe 322, and effectively control the pressure of the protective gas inside the laser head 2.

[0029] Reference Figure 5The air guide member 35 includes a conical air guide cover 1 351, one end of the conical air guide cover 1 351 with a small diameter is fixedly connected to one end of the inner shell 31, a conical air guide cover 2 352 is arranged on the inner side of the conical air guide cover 1 351, one end of the conical air guide cover 2 352 with a small diameter is fixedly connected to one end of the inner shell 31, the conical air guide cover 1 351 and the conical air guide cover 2 352 are both arranged through the inner shell 31, and a plurality of air guide holes 1 353 are arranged on the outer sides of the conical air guide cover 1 351 and the conical air guide cover 2 352, and the plurality of air guide holes 1 353 all penetrate the side wall of the inner shell 31 and are distributed at equal angles around the inner shell 31, and a plurality of air guide holes 2 354 are arranged on the inner side of the conical air guide cover 2 352, and the plurality of air guide holes 2 354 all penetrate the side wall of the inner shell 31 and are distributed at equal angles around the inner shell 31.

[0030] The working principle of the utility model is as follows: the protective gas is vertically introduced into the inner shell 31 through the air inlet pipe 322, and then the protective gas is discharged along the axial direction of the inner shell 31 through the air guide hole 1 353 and the air guide hole 2 354. The protective gas discharged from the air guide hole 1 353 will be blown toward the inner wall of the laser channel 21 in the conical guide cover 1 351 and the conical guide cover 2 352, so that the dust attached to the inner wall of the laser channel 21 can be blown out, and the air guide hole 2 354 can blow out the dust in the central area of ​​the laser channel 21, so as to avoid the dust inside the laser channel 21 from interfering with the laser beam.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser cutting head, comprising a laser head (2), wherein the laser head (2) is fixedly mounted at the outlet end of a lens device, and a laser channel (21) is provided inside the laser head (2), characterized in that: A protective gas distribution mechanism (3) is arranged inside the laser channel (21), and the protective gas distribution mechanism (3) comprises an inner shell (31) arranged concentrically with the laser head (2), the inner shell (31) is located at one end of the laser channel (21), an air inlet (32) for introducing protective gas into the inner shell (31) is arranged on the outer side of the inner shell (31), and a gas guide (35) for guiding the protective gas along the axial direction of the inner shell (31) is arranged at one end of the inner shell (31).

2. A laser cutting head according to claim 1, characterized in that: An outlet port (22) is provided at the outlet end of the laser head (2), and the outlet port (22) is arranged concentrically with the laser channel (21).

3. A laser cutting head according to claim 2, characterized in that: The inner shell (31) is a cylindrical structure, and laser guide holes (33) are provided through the center positions of both ends of the inner shell (31), and the laser guide holes (33) are arranged concentrically with the outlet port (22).

4. A laser cutting head according to claim 3, characterized in that: A protective tube (34) is fixedly connected to the center position of one end of the inner shell (31), and the protective tube (34) passes through the two laser guide holes (33) and extends to the inner side of the outlet port (22).

5. A laser cutting head according to claim 4, characterized in that: The protection tube (34) is arranged concentrically with the outlet port (22), and the outer diameter of the protection tube (34) is smaller than the inner diameter of the outlet port (22).

6. A laser cutting head according to claim 1, characterized in that: The air intake member (32) comprises a mounting seat (321), the mounting seat (321) being fixedly mounted on one end of the outer side of the laser head (2), an air intake pipe (322) being fixedly connected to the middle of the outer side of the mounting seat (321), the air intake pipe (322) penetrating the inner wall of the laser head (2) and extending into the interior of the inner shell (31).

7. A laser cutting head according to claim 6, characterized in that: The air inlet component (32) further comprises an air valve (323), wherein the air valve (323) is fixedly mounted at the inlet end of the air inlet pipe (322), and the inlet end of the air valve (323) is externally connected to a protective gas supply device via a conduit.

8. The laser cutting head according to claim 5, characterized in that: The air guide member (35) comprises a conical air guide cover (351), a small-diameter end of the conical air guide cover (351) being fixedly connected to one end of the inner shell (31), and a conical air guide cover (352) is arranged on the inner side of the conical air guide cover (351), and a small-diameter end of the conical air guide cover (352) being fixedly connected to one end of the inner shell (31).

9. A laser cutting head according to claim 8, characterized in that: The conical flow guide cover 1 (351) and the conical flow guide cover 2 (352) are both centrally arranged with the inner shell (31).

10. A laser cutting head according to claim 9, characterized in that: The outer sides of the conical air guide cover 1 (351) and the conical air guide cover 2 (352) are both provided with a plurality of air guide holes 1 (353), and the plurality of air guide holes 1 (353) all penetrate the side wall of the inner shell (31) and are distributed at equal angles around the inner shell (31); the inner side of the conical air guide cover 2 (352) is provided with a plurality of air guide holes 2 (354), and the plurality of air guide holes 2 (354) all penetrate the side wall of the inner shell (31) and are distributed at equal angles around the inner shell (31).

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