CN112091451A

CN112091451A - Laser processing head and laser processing equipment

Info

Publication number: CN112091451A
Application number: CN202011065984.3A
Authority: CN
Inventors: 蒋修青; 朱小杰
Original assignee: Gangchun Laser Technology Jiangsu Co ltd
Current assignee: Gangchun Laser Technology Jiangsu Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-18
Also published as: WO2022068101A1

Abstract

The invention discloses a laser processing head and laser processing equipment, and belongs to the technical field of laser processing. The laser processing equipment comprises a laser processing head, wherein the laser processing head comprises an optical fiber connecting device, a first protection device, a collimating device, a focusing device, a second protection device, a nozzle device, a back plate and a mounting shell which are sequentially arranged along a laser emission direction, the mounting shell is positioned between the first protection device and the nozzle device and is connected to the back plate, the collimating device, the focusing device and the second protection device are all arranged in the mounting shell, and a plurality of grooves are formed in the position, facing one side of the mounting shell, of the back plate and below the mounting shell; the first protective lens can be drawn out or slid in from one side of the first protective device, the collimating lens can be drawn out or slid in from one side of the collimating device, the focusing lens can be drawn out or slid in from the focusing device, and the second protective lens can be drawn out or slid in from one side of the second protective device. The invention can realize high-power processing of the laser processing head.

Description

Laser processing head and laser processing equipment

Technical Field

The invention relates to the technical field of laser processing, in particular to a laser processing head.

Background

In the laser cutting process, high-power processing is a development trend, and the main index that the laser processing head can realize high-power processing is that the lens does not generate heat under continuous high-power laser irradiation, so that the laser processing head can stably cut for a long time, and the maintenance convenience of the laser processing head is also considered. During high-power laser processing, fine dust may burn the lens, so that the high-power processing has a high requirement on the sealing performance of the laser processing head. In addition, after the lens burns out, the lens needs to be replaced, and if the lens replacement takes a long time, the production efficiency is reduced.

Disclosure of Invention

One purpose of the invention is to provide a laser processing head which has good sealing effect, thereby being beneficial to realizing high-power processing of the laser processing head and being convenient for maintenance;

another object of the present invention is to provide a laser processing apparatus, which is beneficial to high power processing and improves production efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a laser processing head, includes the optic fibre connecting device, first protection device, collimating device, focusing device, second protection device and the nozzle device that set gradually along laser emission direction, first protection device includes first protection lens, collimating device includes the collimation lens, focusing device includes the focus lens, second protection device includes second protection lens, still includes:

the optical fiber connecting device, the first protection device, the collimation device, the focusing device, the second protection device and the nozzle device are arranged on one side of the back plate; and

the mounting shell is positioned between the first protection device and the nozzle device and connected to the back plate, the collimating device, the focusing device and the second protection device are all arranged in the mounting shell, and a plurality of grooves are formed in the positions, facing one side of the mounting shell, of the back plate and below the mounting shell;

the first protective lens can be drawn out or slid in from one side of the first protection device, the collimating lens can be drawn out or slid in from one side of the collimating device, the focusing lens can be drawn out or slid in from the focusing device, and the second protective lens can be drawn out or slid in from one side of the second protection device.

Optionally, the collimating lens, the focusing lens and the second protection lens can be drawn out or slid in from the side of the mounting shell away from the back plate, and the outer edge of the cover plate is in sealing connection with the mounting shell so as to seal the mounting opening of the mounting shell where the collimating lens, the focusing lens and the second protection lens correspond to.

Optionally, a cooling device is further included, the cooling device comprising:

a water inlet of the first cooling channel is arranged on the first protection device, the first cooling channel sequentially penetrates through the first protection device, the mounting shell and the second protection device, and a water outlet of the first cooling channel is arranged on the mounting shell;

a second cooling channel disposed in the collimating device; and

a third cooling channel disposed at the focusing assembly.

Optionally, the first protection device further comprises:

the first base is connected to the mounting shell, and a first slot is formed in one side of the first base;

the first lens cone is inserted into the first slot, and the first protective lens is arranged in the first lens cone;

the connecting seat is arranged between the first base and the mounting shell;

the energy absorbing piece is arranged in the connecting seat and provided with a through hole for the laser beam to pass through, the through hole is conical, the top of the energy absorbing piece is connected to the bottom of the first base, and the first cooling channel passes through the energy absorbing piece.

Optionally, the collimator lens device further includes:

the second base is arranged in the mounting shell, and a second slot is formed in one side of the second base;

the second lens cone is arranged in the second slot, the collimating lens is arranged in the second lens cone, and the mounting shell is provided with a first socket corresponding to the second slot;

the first shielding cylinder is arranged in the mounting shell and connected to the top of the first base; and

the second shielding cylinder is arranged in the mounting shell and connected to the bottom of the first base.

Optionally, the backplate has a cavity, and the laser processing head still includes drive arrangement, drive arrangement set up in the cavity, drive arrangement includes voice coil motor, second base sliding connection in the inner wall of installation shell, voice coil motor's output connect in the second base is in order to drive the second base is followed the central axis direction reciprocating motion of second base.

Optionally, the focusing device comprises:

the third base is arranged in the mounting shell, a third slot is formed in one side of the third base, and a second socket is formed in the mounting shell corresponding to the third slot;

the third lens cone is arranged in the third slot, and the focusing lens is arranged in the third lens cone; and

and the moving mechanism can drive the third base to move in the mounting shell along the direction vertical to the emission direction of the laser.

Optionally, the nozzle device further comprises a third protection device, the third protection device is disposed between the second protection device and the nozzle device, and the third protection device comprises:

the fourth base is arranged at the bottom of the mounting shell, and a fourth slot is formed in one side of the fourth base;

the fourth lens cone is inserted into the fourth slot; and

a third protective lens disposed in the fourth barrel.

Optionally, the device further comprises an auxiliary air blowing device, wherein the auxiliary air blowing device comprises a third air blowing mechanism, and the third air blowing mechanism comprises:

the air inner ring is arranged in the fourth base, the outer walls at two ends of the air inner ring are in sealing connection with the inner wall of the fourth base, the outer wall of the middle section of the air inner ring and the inner wall of the fourth base form an annular airflow groove, a plurality of air holes which incline upwards to the third protective lens are arranged on the air inner ring wall, the air holes are uniformly distributed along the circumferential direction of the air inner ring and are communicated with the airflow groove, and at least two air inlets communicated with the airflow groove are arranged on the fourth base.

A laser processing device comprises the laser processing head.

The invention has the beneficial effects that:

the optical fiber connecting device, the first protection device, the collimating device, the focusing device, the second protection device and the nozzle device are arranged on one side of the back plate; the mounting shell is positioned between the first protection device and the nozzle device and is connected to the back plate, and the collimating device, the focusing device and the second protection device are all arranged in the mounting shell, so that the collimating device, the focusing device and the second protection device can form a whole, and the dust entering way is reduced; the back plate faces one side of the mounting shell and is provided with the plurality of grooves at the position below the mounting shell, dust entering from the joint of the back plate, the nozzle device and the back plate can be stored in the grooves, the dust is prevented from polluting lenses in the mounting shell, and the arrangement of the back plate and the mounting shell can enable the laser processing head to form a good sealing effect except for a laser incident port and a laser emergent port of the laser processing head, so that the entering of external dust can be reduced, and the high-power processing of the laser processing head can be realized; in addition, first protective glass piece can be taken out or slided in from one side of first protection device, and collimating lens can be taken out or slided in from one side of collimating device, and focusing lens can be taken out or slided in from focusing device, and second protective glass piece can be taken out or slided in from one side of second protection device, and every lens all can be taken out alone and put into, can be convenient for first protective glass piece, collimating lens, focusing lens and the maintenance and the change of second protective glass piece to be favorable to improving production efficiency.

Drawings

Fig. 1 is a schematic perspective view of a laser processing head according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a collimating device, a focusing device and a second protecting device of a laser processing head according to an embodiment of the present invention;

fig. 3 is a schematic top view of a laser processing head according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is a schematic view of a portion of the structure of FIG. 5;

fig. 7 is a schematic perspective view of a collimator and a driving device of a laser processing head according to an embodiment of the present invention;

FIG. 8 is a schematic perspective view of a collimating assembly of a laser processing head of an embodiment of the present invention with upper and lower shield sleeves removed;

fig. 9 is an exploded view of a focusing device of a laser processing head according to an embodiment of the present invention.

In the figure:

1. an optical fiber connection device; 2. a first protection device; 21. a first base; 22. a first barrel; 23. an energy absorbing member; 24. a connecting seat; 3. a cover plate; 4. a third protection device; 41. a fourth base; 42. a fourth barrel; 5. a nozzle device; 51. a fifth base; 52. a first connecting body; 53. a second connector; 54. an insulating sleeve; 55. a nozzle; 6. a back plate; 61. a groove; 7. mounting a shell; 8. a collimating device; 81. a first shielding cylinder; 82. a second barrel; 83. a second base; 84. a second shielding cylinder; 9. a drive device; 91. a voice coil motor; 92. a limiting mechanism; 921. a first photoelectric switch; 922. a sensing member; 923. a second photoelectric switch; 10. a cooling device; 101. a third cooling channel; 102. a second cooling channel; 103. a first cooling channel; 11. a focusing device; 111. a third barrel; 112. a third base; 113. a moving mechanism; 1131. a drive member; 11311. an adjustment column; 11312. an adjusting block; 1132. a spring plate; 114. a drawer base; 12. a second protection device; 13. an auxiliary blowing device; 131. a first air blowing mechanism; 1311. an inner ring of gas; 13111. air holes; 1312. a first airflow slot; 132. a third air blowing mechanism; 133. a second blowing mechanism; 14. a barometer.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to fig. 1 to 9.

The invention provides a laser processing device which comprises a laser processing head.

As shown in fig. 1 to 4, the laser processing head includes an optical fiber connection device 1, a first protection device 2, a collimating device 8, a focusing device 11, a second protection device 12, a nozzle device 5, a back plate 6, and a mounting case 7, which are sequentially arranged along a laser emission direction, the first protection device 2 includes a first protection lens, the collimating device 8 includes a collimating lens, the focusing device 11 includes a focusing lens, and the second protection device 12 includes a second protection lens. The optical fiber connection device 1, the first protection device 2, the collimation device 8, the focusing device 11, the second protection device 12 and the nozzle device 5 are arranged on one side of the back plate 6.

The mounting housing 7 is located between the first protection means 2 and the nozzle device 5 and is connected to the back plate 6. The collimating means 8, the focusing means 11 and the second protecting means 12 are arranged in the mounting housing 7. The back plate 6 faces one side of the mounting shell 7 and is provided with a plurality of grooves 61 at the position below the mounting shell 7, and dust entering from the connection part of the back plate 6 and the nozzle device 5 and the back plate 6 can be stored in the grooves 61, so that the dust is prevented from polluting lenses in the mounting shell 7.

The first protective lens can be extracted or slid in from the side of the first protective device 2, the collimator lens can be extracted or slid in from the side of the collimator 8, the focusing lens can be extracted or slid in from the focusing device 11, and the second protective lens can be extracted or slid in from the side of the second protective device 12. Each lens can be independently taken out and put in, maintenance and replacement of the first protective lens, the collimating lens, the focusing lens and the second protective lens can be facilitated, and therefore production efficiency is improved.

In this embodiment, the mounting housing 7 may form the collimating means 8, the focusing means 11 and the second protecting means 12 as a whole, reducing the access of dust. The arrangement of the back plate 6 and the mounting shell 7 can ensure that the laser processing head of the invention forms a good sealing effect except a laser incident port and a laser emergent port of the laser processing head, thereby reducing the entering of external dust and being beneficial to realizing high-power processing of the laser processing head.

In order to further improve the sealing effect at the mounting shell 7, the laser processing head in this embodiment further includes the cover plate 3, the cover plate 3 is connected to the side of the mounting shell 7 away from the back plate 6, the collimating lens, the focusing lens and the second protection lens can be drawn out or slid in from the side of the mounting shell 7 away from the back plate 6, and the outer edge of the cover plate 3 is hermetically connected with the mounting shell 7 to seal the mounting port of the mounting shell 7 corresponding to the collimating lens, the focusing lens and the second protection lens. The cover plate 3 is provided to prevent dust from entering the inside of the mounting case 7 from the mounting openings of the collimating lens, the focusing lens and the second protective lens, so that the power of the laser processing head in the present embodiment can be improved.

In order to improve the processing power of the laser processing head in this embodiment and prevent the lens from being burned out due to an excessively high temperature, the laser processing head in this embodiment further includes a cooling device 10, the cooling device 10 includes a first cooling channel 103, a second cooling channel 102 and a third cooling channel 101, a water inlet of the first cooling channel 103 is disposed in the first protection device 2, the first cooling channel 103 sequentially penetrates through the first protection device 2, the mounting shell 7 and the second protection device 12, a water outlet of the first cooling channel 103 is disposed in the mounting shell 7, and the first cooling channel 103 can cool the whole laser processing head in this embodiment. The second cooling channel 102 is disposed on the collimating device 8, and the cooling effect of the collimating lens can be improved by the second cooling channel 102. The third cooling passage 101 is provided in the focusing device 11, and the cooling effect on the focusing lens can be improved by the provision of the third cooling passage 101.

As shown in fig. 4 and 5, the first protection device 2 further includes a first base 21, a first lens barrel 22, a connecting seat 24, and an energy absorbing member 23. The first base 21 is connected to the mounting case 7, and a first slot is formed in one side of the first base 21. First lens cone 22, first lens cone 22 insert and establish in first slot, and first protection lens sets up in first lens cone 22, and first lens cone 22 can drive first protection lens and take out from one side of first base 21, can be convenient for the change and the maintenance of first protection lens. The connection seat 24 is provided between the first base 21 and the mounting case 7. The energy absorbing piece 23 is arranged in the connecting seat 24, the energy absorbing piece 23 is provided with a through hole for the laser beam to pass through, the through hole is conical, the top of the energy absorbing piece 23 is connected to the bottom of the first base 21, and the first cooling channel 103 passes through the energy absorbing piece 23. Stray light of laser beams can be blocked by the energy absorption piece 23, and the first cooling channel 103 can dissipate heat of the energy absorption piece 23, so that heat generated by the stray light is eliminated, heat of the laser processing head is reduced, and the processing efficiency of the laser processing head is improved.

As shown in fig. 4, 7 and 8, the collimator lens device further includes a second base 83, a second lens barrel 82, a first shielding cylinder 81 and a second shielding cylinder 84, the second base 83 is disposed in the mounting case 7, and a second slot is formed on one side of the second base 83. The second lens cone 82 is arranged in the second slot, the collimating lens is arranged in the second lens cone 82, the mounting shell 7 is provided with a first socket corresponding to the second slot, and the second lens cone 82 can drive the collimating lens to be drawn out from the first socket or slide in, so that the collimating lens can be maintained and replaced conveniently. The first shielding cylinder 81 is disposed in the mounting case 7, and the first shielding cylinder 81 is connected to the top of the first base 21. The second shielding cylinder 84 is disposed on the mounting case 7, and the second shielding cylinder 84 is connected to the bottom of the first base 21. The first shielding cylinder 81 and the second shielding cylinder 84 can block stray light of the laser beam.

Along with laser machining's application is more and more extensive, and the processing requirement to laser is higher and higher, and more laser cutting head needs automatic focusing, realizes automatic focusing for the laser beam machining head in this embodiment. As shown in fig. 4 and 7, the back plate 6 has a cavity, the laser processing head further includes a driving device 9, the driving device 9 is disposed in the cavity, the driving device 9 includes a voice coil motor 91, the second base 83 is slidably connected to the inner wall of the mounting case 7, and an output end of the voice coil motor 91 is connected to the second base 83 to drive the second base 83 to reciprocate along a central axis direction of the second base 83. Drive second base 83 through voice coil motor 91 and drive the focusing lens piece and remove, realize the focusing of laser head, response speed is fast, can improve the efficiency of perforation processing, and does not have the wearing and tearing of driving medium to can improve the life of laser head. Further, the driving device 9 further includes a limit mechanism 92, and the through hole limit mechanism 92 controls the stroke of the voice coil motor 91. Optionally, the limiting mechanism 92 includes a first photoelectric switch 921 and a second photoelectric switch 923 fixed to the mounting housing 7 or the back plate 6 and sequentially arranged at intervals along the moving direction of the second base 83, the first photoelectric switch 921 corresponds to the highest point position of the second base 83, the second photoelectric switch 923 corresponds to the lowest point position of the second base 83, the second base 83 is connected to a sensing member 922, and the sensing member 922 is used for triggering the first photoelectric switch 921 or the second photoelectric switch 923. It can be understood that, when the second base 83 drives the sensing member 922 to move to the position of the first photoelectric switch 921, the voice coil motor 91 reversely rotates to drive the second base 83 to reversely move, and when the second base 83 drives the sensing member 922 to move to the position of the second photoelectric switch 923, the voice coil motor 91 reversely rotates to drive the second base 83 to reversely move again, so as to reciprocate, thereby realizing the reciprocating motion of the second base 83.

As shown in fig. 4 and 5, the focusing device 11 includes a third base 112, a third lens barrel 111 and a moving mechanism 113, the third base 112 is disposed in the mounting case 7, a third slot is formed on one side of the third base 112, and a second socket is formed on the mounting case 7 corresponding to the third slot. The third lens barrel 111 is disposed in the third slot, and the focusing lens is disposed in the third lens barrel 111. The third lens barrel 111 can drive the focusing lens to be drawn out from the second socket or slide in, so that the focusing lens can be maintained and replaced conveniently. The moving mechanism 113 can move the third base 112 in the mounting case 7 in a direction perpendicular to the emitting direction of the laser light. The position of the focusing lens can be adjusted by the moving mechanism 113, which is advantageous for ensuring the coaxiality of the collimating lens.

Further, the moving mechanism 113 includes a driving member 1131 and an elastic piece 1132, the driving member 1131 is connected to the third base 112, the elastic piece 1132 is disposed between the third base 112 and the inner wall of the installation shell 7, and the elastic piece 1132 is located on one side of the third base 112 far from the second socket. When the force is applied to the driving adjusting column 11311, the driving element 1131 can push the third base 112 to move, and the third base 112 can press the elastic piece 1132 to make the elastic piece 1132 push the third base 112 to move. It can be appreciated that the amount of movement of the third base 112 can be controlled by controlling the amount of force applied to the spring 1132, which is convenient for adjustment.

As shown in fig. 9, the focusing lens device further includes a drawer seat 114 disposed at the second socket, the driving element 1131 includes two top blocks and two adjusting columns 11311, one ends of the two top blocks are connected to the drawer seat 114 through a rotating shaft, and the other ends of the two top blocks are respectively located on two sides of the third base 112 and can abut against the third base 112. Each adjusting column 11311 corresponds to a top block, which penetrates through the drawer seat 114 from outside to inside and can be abutted against the top block, so as to drive the top block to rotate around the rotating shaft. When the position of third base 112 need be adjusted, when adjusting post 11311 in the rotation, adjust post 11311 and remove to the kicking block, the kicking block can extrude third base 112, and third base 112 extrusion shell fragment 1132 under the reaction force of shell fragment 1132, promote third base 112 and remove, utilize two positions of adjusting the cooperation of post 11311 and adjusting third base 112, it is more convenient to adjust.

In this embodiment, the adjusting column 11311 is provided with a sealing ring, which can increase the sealing effect at the joint of the adjusting column 11311 and the drawer seat 114, and prevent dust from entering the inside of the mounting case 7 from the joint of the adjusting column 11311 and the drawer seat 114.

According to the invention, the first protection device 2 can prevent dust from entering the laser processing head in the embodiment to pollute the lens when the laser head is plugged and pulled, and the second protection device 12 can prevent slag, smoke and the like from entering the laser processing head in the embodiment to pollute the lens in the process of processing a workpiece.

In order to further prevent the slag, the smoke, and the like from entering the inside of the laser processing head in the present embodiment during the processing, as shown in fig. 5 and 6, the laser processing head in the present embodiment further includes a third protective device 4, the third protective device 4 is disposed between the second protective device 12 and the nozzle device 5, and the third protective device 4 includes a fourth base 41, a fourth barrel 42, and a third protective lens. The fourth base 41 is disposed at the bottom of the mounting case 7, and a fourth slot is formed at one side of the fourth base 41. The fourth barrel 42 is inserted into the fourth slot. The third protective lens is disposed in the fourth barrel 42.

As shown in fig. 4, the nozzle device 5 is connected with a gas pressure gauge which can facilitate detection of the gas pressure inside the nozzle device 5. The comparison between the air pressure in the detection nozzle device 5 and the pressure difference supplied by the air source is convenient to remove the pressure difference and air leakage in the air path, and the air pressure can be optimized and the air consumption can be saved by being convenient for operating personnel to find out a proper cutting numerical value.

As shown in fig. 4 to 6, the nozzle device 5 includes a fifth base 51, a first connecting body 52, a second connecting body 53, an insulating sleeve 54, and a nozzle 55, which are sequentially arranged along the laser emission direction, the nozzle 55 and the insulating sleeve 54 are screwed, the insulating sleeve 54 and the second connecting body 53 are connected by a locking nut, a flange is provided on the outer edge of the insulating sleeve 54, the locking nut is sleeved on the insulating sleeve 54, the bottom of the locking nut abuts against the lower bottom surface of the flange, and the top of the insulating sleeve 54 is screwed to the second connecting body 53.

The influence of the uniformity and smoothness of the gas flow on the size, the shape of the cross section, the roughness and the like of the slit in the laser cutting process is large, the laser processing head in this embodiment further comprises an auxiliary gas blowing device 13, the auxiliary gas blowing device 13 comprises a first gas blowing mechanism 131, the first gas blowing mechanism 131 comprises a gas inner ring 1311, the gas inner ring 1311 is arranged in the fourth base 41, the outer walls at the two ends of the gas inner ring 1311 are in sealing connection with the inner wall of the fourth base 41, the outer wall of the middle section of the gas inner ring 1311 and the inner wall of the fourth base 41 form an annular first gas flow groove 1312, the wall of the gas inner ring 1311 is provided with a plurality of gas holes 13111 which incline upwards towards the third protective lens, the plurality of gas holes 13111 are uniformly distributed along the circumferential direction of the gas inner ring 1311 and are communicated with the first gas flow groove 1312, and the fourth base 41 is provided with at least two gas. Through the arrangement of the first blowing mechanism 131, the stability of the air flow is improved, so that the quality of laser processing can be improved. Specifically, the first airflow groove 1312 is communicated with at least two air inlets, and the air inlets are uniformly distributed along the circumferential direction of the first airflow groove 1312, so that the homogenization effect of the airflow is further improved. Further, the ratio of the volume of the first gas flow groove 1312 to the volume of the laser beam channel from the third protection lens to the end of the nozzle device 5 is 3:16, and the homogenization effect of the gas flow is further improved by the arrangement of the ratio of the volumes of the first gas flow groove 1312 and the third protection lens to the laser beam channel from the end of the nozzle device 5. The air current evenly steady flows out from nozzle device 5 after the third protective glass reflects, blows away the welding slag on workpiece surface rapidly through even steady high-speed air current, can improve welding quality. Meanwhile, when the airflow blows to the third protective lens, the third protective lens can be prevented from being polluted by deposited dust of the third protective lens, heat generated by the third protective lens can be taken away, and the service life of the third protective lens is prolonged.

As shown in fig. 4 and 5, the auxiliary air-blowing device 13 further includes a third air-blowing mechanism 132 and a second air-blowing mechanism 133. The air outlet of the third air blowing mechanism 132 is provided at one side of the nozzle device 5. The residues produced by the cutting perforation can be blown away by blowing air outside the nozzle device 5, while the nozzle device 5 can be cooled to a certain extent. The air outlet of the second blowing mechanism 133 is disposed on the nozzle device 5 and at the periphery of the laser outlet of the nozzle device 5. By providing the air outlet at the periphery of the nozzle 55, the nozzle 55 can be cooled.

In this embodiment, the mounting shell 7 can enable the collimating device 8, the focusing device 11 and the second protection device 12 to form double-layer protection, and the arrangement of the back plate 6 and the mounting shell 7 can enable the laser processing head of the present invention to form a good sealing effect except for a laser incident port and a laser exit port of the laser processing head, so that the entry of external dust can be reduced, which is beneficial to enabling the laser processing head to realize high-power processing, and the processing efficiency of the laser processing head can be further improved by the arrangement of the cooling device 10. In addition, each lens can be taken out and put in independently, and the maintenance and the replacement of the first protective lens, the collimating lens, the focusing lens and the second protective lens can be facilitated, so that the production efficiency is improved.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a laser processing head, includes along optical fiber connecting device (1), first protection device (2), collimating device (8), focusing device (11), second protection device (12) and nozzle device (5) that laser emission direction set gradually, first protection device (2) include first protection lens, collimating device (8) include the collimation lens, focusing device (11) include the focus lens, second protection device (12) include second protection lens, its characterized in that still includes:

a back plate (6), the optical fiber connection device (1), the first protection device (2), the collimation device (8), the focusing device (11), the second protection device (12) and the nozzle device (5) are arranged on one side of the back plate (6); and

the mounting shell (7) is positioned between the first protection device (2) and the nozzle device (5) and connected to the back plate (6), the collimating device (8), the focusing device (11) and the second protection device (12) are all arranged in the mounting shell (7), and a plurality of grooves (61) are formed in the positions, facing one side of the mounting shell (7), of the back plate (6) and below the mounting shell (7);

the first protective lens can be extracted or slid in from one side of the first protective device (2), the collimating lens can be extracted or slid in from one side of the collimating device (8), the focusing lens can be extracted or slid in from the focusing device (11), and the second protective lens can be extracted or slid in from one side of the second protective device (12).

2. The laser machining head according to claim 1, further comprising a cover plate (3), wherein the cover plate (3) is connected to a side of the mounting housing (7) facing away from the back plate (6), wherein the collimating lens, the focusing lens and the second protective lens can be drawn out or slid in from a side of the mounting housing (7) facing away from the back plate (6), and wherein an outer edge of the cover plate (3) is in sealing connection with the mounting housing (7) to seal the collimating lens, the focusing lens and the second protective lens corresponding to the mounting opening of the mounting housing (7).

3. Laser machining head according to claim 1, characterized in that it further comprises cooling means (10), said cooling means (10) comprising:

a water inlet of the first cooling channel (103) is arranged on the first protection device (2), the first cooling channel (103) sequentially penetrates through the first protection device (2), the installation shell (7) and the second protection device (12), and a water outlet of the first cooling channel (103) is arranged on the installation shell (7);

a second cooling channel (102), the second cooling channel (102) being provided to the collimating means (8); and

a third cooling channel (101), the third cooling channel (101) being provided to the focusing device (11).

4. Laser machining head according to claim 3, characterized in that said first protection device (2) further comprises:

the first base (21) is connected to the mounting shell (7), and a first slot is formed in one side of the first base (21);

the first lens barrel (22), the first lens barrel (22) is inserted into the first slot, and the first protective lens is arranged in the first lens barrel (22);

a connecting seat (24) provided between the first base (21) and the mounting case (7);

the energy absorbing piece (23) is arranged in the connecting seat (24), the energy absorbing piece (23) is provided with a through hole for the laser beam to pass through, the through hole is conical, the top of the energy absorbing piece (23) is connected to the bottom of the first base (21), and the first cooling channel (103) passes through the energy absorbing piece (23).

5. Laser machining head according to any one of claims 1 to 4, characterized in that the collimating mirror means further comprise:

the second base (83) is arranged in the mounting shell (7), and a second slot is formed in one side of the second base (83);

the second lens barrel (82), the second lens barrel (82) is arranged in the second slot, the collimating lens is arranged in the second lens barrel (82), and the mounting shell (7) is provided with a first socket corresponding to the second slot;

the first shielding cylinder (81), the first shielding cylinder (81) is arranged in the mounting shell (7), and the first shielding cylinder (81) is connected to the top of the first base (21); and

a second shielding cylinder (84), wherein the second shielding cylinder (84) is arranged in the mounting shell (7), and the second shielding cylinder (84) is connected to the bottom of the first base (21).

6. The laser machining head as claimed in claim 5, characterized in that the backing plate (6) has a cavity, the laser machining head further comprising a drive device (9), the drive device (9) being disposed in the cavity, the drive device (9) comprising a voice coil motor (91), the second pedestal (83) being slidably connected to an inner wall of the mounting housing (7), an output of the voice coil motor (91) being connected to the second pedestal (83) for driving the second pedestal (83) to reciprocate in a direction of a central axis of the second pedestal (83).

7. Laser machining head according to any one of claims 1 to 4, characterized in that said focusing means (11) comprise:

the third base (112) is arranged in the mounting shell (7), a third slot is formed in one side of the third base (112), and a second socket is formed in the mounting shell (7) corresponding to the third slot;

the third lens cone (111) is arranged in the third slot, and the focusing lens is arranged in the third lens cone (111); and

the moving mechanism (113), the moving mechanism (113) can drive the third base (112) to move in the mounting shell (7) along the direction perpendicular to the emitting direction of the laser.

8. Laser machining head according to any one of claims 1 to 4, characterized in that it further comprises a third protection device (4), said third protection device (4) being arranged between said second protection device (12) and said nozzle device (5), said third protection device (4) comprising:

the fourth base (41) is arranged at the bottom of the mounting shell (7), and a fourth slot is formed in one side of the fourth base (41);

a fourth lens barrel (42) inserted in the fourth slot; and

a third protective lens disposed within the fourth barrel (42).

9. Laser machining head according to any one of claims 8, characterized in that it further comprises an auxiliary blowing device (13), said auxiliary blowing device (13) comprising a third blowing mechanism (132), the third blowing mechanism (132) comprising:

the air inner ring (1311) is arranged in the fourth base (41), outer walls at two ends of the air inner ring (1311) are in sealing connection with an inner wall of the fourth base (41), an annular airflow groove is formed between the outer wall of the middle section of the air inner ring (1311) and the inner wall of the fourth base (41), a plurality of air holes (13111) which incline upwards towards the third protective lens are formed in the wall of the air inner ring (1311), the air holes (13111) are uniformly distributed along the circumferential direction of the air inner ring (1311) and are communicated with the airflow groove, and at least two air inlets communicated with the airflow groove are formed in the fourth base (41).

10. A laser machining apparatus comprising a laser machining head as claimed in any one of claims 1 to 9.