CN113547204B

CN113547204B - Four-myriawatt high-power laser cutting head

Info

Publication number: CN113547204B
Application number: CN202110930987.7A
Authority: CN
Inventors: 吴让大; 蔡亮; 徐侠; 吴欣; 李正; 杨忠明
Original assignee: Pentium Laser Zhejiang Co ltd
Current assignee: Pentium Laser Zhejiang Co ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-01-10
Anticipated expiration: 2041-08-13
Also published as: CN113547204A

Abstract

The invention relates to the technical field of laser cutting heads, in particular to a high-power laser cutting head with four ten-thousand watts, which comprises: the laser processing device comprises a main body, a laser processing device and a laser processing device, wherein one end of the main body is a laser inlet end, the other end of the main body is a nozzle for outputting laser, a collimating lens and a focusing lens are arranged in the main body, and laser with power of forty-thousand watts enters from the inlet end, sequentially passes through the collimating lens and the focusing lens and then is output from the nozzle; the focal length of the collimating lens is 100mm, and the focal length of the focusing lens is 300mm. The invention adopts the focusing lens with the focal length of 300mm and the collimating lens with the focal length of 100mm, so that the amplification factor of the light beam is M3, compared with the existing 20 kilowatt optical amplification system adopting M2, the invention reduces the energy density of the light beam, thereby avoiding the lens from being damaged due to overheating.

Description

Four-myriawatt high-power laser cutting head

Technical Field

The invention relates to the technical field of laser cutting heads, in particular to a high-power laser cutting head with four ten-thousand watts.

Background

The laser cutting head is composed of a nozzle, a focusing lens, a focusing tracking system and the like and is used for cutting an article. And with the continuous development of laser technology, the power of the current high-power laser cutting system is continuously increased, and high-power cutting equipment with 15 kilowatts and 20 kilowatts is already on the market. However, when a 40 kw laser machine is developed, the development of the laser cutting head becomes a technical bottleneck. This is because the use of a 40 kw laser configuration and beam quality in combination with a laser cutting head having the same optical characteristics as 20 kw can result in the lens being subjected to too high an energy density which can cause the lens to overheat and become damaged.

Disclosure of Invention

The invention aims to provide a high-power laser cutting head with four ten thousand watts, which adopts a focusing lens with the focal length of 300mm and a collimating lens with the focal length of 100mm, so that the amplification factor of a light beam is M3, compared with the existing 20 kilowatt optical amplification system adopting M2, the high-power laser cutting head reduces the energy density of the light beam, thereby avoiding the damage of the lens caused by heating and overheating, and solving the problem that 40 kilowatt cannot be matched with the cutting head with 20 kilowatt.

The purpose of the invention is realized as follows:

a high power laser cutting head of forty-thousand watts comprising:

the laser processing device comprises a main body, a laser inlet end, a nozzle for outputting laser, a collimating lens and a focusing lens, wherein the collimating lens and the focusing lens are arranged in the main body, and laser with power of forty-thousand watts enters from the inlet end, sequentially passes through the collimating lens and the focusing lens and then is output from the nozzle;

the focal length of the collimating lens is 100mm, and the focal length of the focusing lens is 300mm.

Preferably, the height dimension of the collimating mirror and the focusing mirror is 50.8mm.

Preferably, the main body is at least internally provided with two protective glasses which are respectively a first protective glass and a second protective glass, the main body is provided with a movable mounting rack, and the mounting rack is sequentially provided with a first movable drawer and a second movable drawer from top to bottom;

the first drawer is provided with the focusing mirror, a first protective mirror is arranged below the focusing mirror, and the second drawer is provided with a second protective mirror.

Preferably, three protective glasses are arranged in the main body, namely a protective glass I, a protective glass II and a protective glass III respectively, the protective glass III is positioned between the protective glass I and the protective glass II, the mounting frame is provided with a movable drawer III between the drawer I and the drawer II, and the drawer III is provided with the protective glass III.

Preferably, the upper side and the lower side of the mounting rack are arranged on the main body through a first connecting piece, and the first connecting piece is in threaded connection with the main body;

or/and one end of the drawer extends out of the mounting frame, the end extending out of the drawer is a mounting plate, the mounting plate is arranged on the mounting frame through a second connecting piece, and the second connecting piece is in threaded connection with the mounting frame.

Preferably, the first convex strips are arranged on two sides of the first drawer, the mounting rack is provided with a mounting Kong Yibing, and a mounting platform extends backwards;

the through-hole that supplies laser transmission is seted up at the main part middle part, and the main part has seted up mounting hole two and mounting groove respectively in the through-hole both sides, and the opening size of mounting hole two is greater than the opening size of mounting groove, two inner wall both sides of mounting hole are provided with the spout two with sand grip two phase adaptation, and mounting groove inner wall both sides are provided with the spout three with sand grip one phase adaptation.

Preferably, a first placing frame and a second placing frame are arranged in the first drawer, long holes are formed in the two sides of the first drawer, and the first placing frame and the second placing frame are respectively used for placing a focusing mirror and a first protective mirror;

the first rack is movably arranged in the first drawer, the mounting rods are arranged at two ends of the first rack, one end of each mounting rod is in threaded connection with the corresponding first rack, the other end of each mounting rod penetrates through the strip hole and is provided with a supporting portion, the inner wall of each supporting portion is supported against the outer side of the corresponding drawer, and the mounting rods are loosened to enable the supporting portions to be far away from the outer side of the corresponding drawer, so that the mounting rods move up and down.

Preferably, a connecting seat is arranged between the nozzle and the main body, the nozzle is movably arranged on the connecting seat, elastic components are arranged on two sides of the nozzle, and clamping holes are uniformly formed in two sides of the connecting seat along the height direction;

the elastic component comprises a moving block and a spring, the spring is located between the nozzle and the moving block, one end of the moving block is located in the clamping hole so as to limit the movement of the nozzle, and the moving block is pressed inwards so as to enable the moving block to leave the clamping hole and further enable the nozzle to move.

Preferably, it is characterized in that: the collimating lens and the focusing lens are movably arranged in the main body, the main body is movably provided with a first mounting seat, and the first mounting seat is provided with the collimating lens;

or, the main part includes interconnect's upper portion and lower part, and the upper portion embeds there is the rack three that is used for placing the collimating mirror to the rack three removes to set up in upper portion, the inside ring channel of having seted up in upper portion, and the ring channel embeds there is the worm wheel, the worm wheel both sides are connected with driving piece and worm respectively, and the worm wheel bottom is connected with rack three through the connecting rod, thereby orders about worm wheel and worm cooperation through the driving piece and drives rack three and reciprocate.

Compared with the prior art, the invention has the outstanding and beneficial technical effects that:

1. the invention adopts the focusing lens with the focal length of 300mm and the collimating lens with the focal length of 100mm, so that the amplification factor of the light beam is M3, compared with the existing 20 kilowatt optical amplification system adopting M2, the invention reduces the energy density of the light beam, thereby avoiding the lens from being damaged due to overheating.

2. According to the invention, the height dimensions of the collimating lens and the focusing lens are designed to be 50.8mm, so that the area is increased, the heat dissipation is facilitated, and the thermal lens effect is reduced.

3. According to the invention, through the arrangement of the mounting rack and the drawers, the whole body can be taken out by taking the mounting rack so as to realize the mounting of each lens, and meanwhile, one of the drawers can be taken so as to realize the replacement of one of the lenses. Meanwhile, the focusing lens is protected by the arrangement of the protective lens.

4. According to the drawer structure, the installation table is arranged, so that the contact area is increased, and the stability of connection between the installation frame and the drawer I and between the installation frame and the main body is guaranteed.

5. According to the invention, the focusing mirror is arranged in a vertically moving manner, so that the position of the focusing mirror is adjusted, and the size of the light spot can be adjusted.

6. According to the invention, the distance between the nozzle and the object is adjusted through the up-and-down movement of the nozzle, so that the focal length of the focusing lens is adjusted, and the size of the light spot can be adjusted.

7. The collimating lens is arranged in a vertically moving mode, so that the collimating lens can be suitable for cutting different materials, and compared with manual adjustment, the collimating lens is better in accuracy.

Drawings

Fig. 1 is a schematic structural diagram of a first structure of the present invention.

Fig. 2 is a schematic structural diagram of a second structure of the present invention.

Fig. 3 is a schematic structural view of a front view of the mounting bracket.

Fig. 4 is a schematic structural view of the main body.

Fig. 5 is a schematic structural view of the mounting bracket.

FIG. 6 is a schematic diagram of a first drawer structure.

Fig. 7 is a schematic structural view of a first drawer structure two.

Fig. 8 is a schematic structural diagram of a collimating mirror related structure.

Fig. 9 is a schematic structural view of a nozzle-related structure.

Reference numerals: 1-a body; 11-a through hole; 12-mounting hole two; 121-chute II; 13-upper part;

131-an annular groove; 132-a worm gear; 133-a drive member; 1311-drive wheels; 134-connecting rod;

135-worm; 136-a lid; 2-a collimating mirror; 3-a focusing mirror; 4-a nozzle; 51-protective glasses I;

52-protective glass II; 53-protective glasses III; 6-an elastic component; 61-a moving block; 62-a spring;

7-placing a third rack; 8-a mounting frame; 81-drawer one; 811-mounting plate; 812-rib one;

813-placing a first rack; 814-placing a second rack; 815-elongated holes; 816-mounting a rod; 8161-abutment;

82-drawer two; 83-drawer three; 84-connecting piece one; 85-connecting piece two; 86-mounting hole one;

861-chute one; 87-a mounting table; 871-convex strip II; 9-a connecting seat; 91-clamping holes;

10-mounting seat II; 101-connecting piece four; 20-mounting seat I; 201-connecting piece three.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

The first embodiment is as follows: as shown in fig. 1, a high power laser cutting head of four ten-thousand watts comprises: the laser light source comprises a main body 1, wherein one end of the main body 1 is a laser inlet end, the other end of the main body 1 is a nozzle 4 for outputting laser, and a collimating lens 2 and a focusing lens 3 are arranged in the main body 1. Therefore, in the actual use process, laser with power of four ten-thousand watts enters from the entrance end and sequentially passes through the collimating mirror 2 and the focusing mirror 3 and then is output from the nozzle 4.

Meanwhile, in order to reduce the energy density borne by the lens, the focal length of the collimating lens 2 is 100mm, and the focal length of the focusing lens 3 is 300mm. This is because the setting is such that the beam magnification factor is M3, wherein the beam magnification factor is the focal length of the focusing mirror 3 divided by the focal length of the collimating mirror 2, and the beam energy density is equal to the power divided by the area, and the area is related to the beam magnification factor, i.e. the larger the beam magnification factor, the larger the area, and thus the present invention reduces the energy density borne by the lens by increasing the area.

And the focal length of the focusing mirror 3 is 300mm, namely the distance between the focusing mirror 3 and an article is 300mm, namely the distance between the focusing mirror 3 and the article is increased to a certain extent, so that the lens is not easy to be dirty.

And when the laser is operated under the condition of high power, the distortion of the thermal lens generated by the temperature gradient distribution in the gain medium is dominant, and the distortion generated by the thermal lens effect causes the instability of the output power and the coupling among multiple modes, and simultaneously limits the improvement of the laser power and seriously influences the performance of the laser.

Therefore, in order to avoid this, the height of the collimating mirror 2 and the focusing mirror 3 is 50.8mm, which increases the area to facilitate heat dissipation and thus reduce the thermal lens effect. But the reduced energy density also reduces thermal lensing.

As shown in fig. 1, the collimating lens 2 and the focusing lens 3 are both movably disposed in the main body 1, wherein the structure of the collimating lens 2 is: first, the main body 1 is movably provided with a first mount 20, and the first mount 20 is provided with the collimator lens 2. Therefore, in actual use, the collimating mirror 2 is installed and replaced by taking the first mounting seat 20.

Meanwhile, a third connecting piece 201 is arranged on one side of the first mounting seat 20, the third connecting piece 201 is in threaded connection with the main body 1, the first mounting seat 20 is limited in movement through the third connecting piece 201, and the third connecting piece 201 can be moved after being unscrewed. And the third connecting piece 201 also provides a stress point, so that a user can take the first mounting seat 20 through the third connecting piece 201.

Therefore, the structure of the focusing mirror 3 is as follows: first, the main body 1 is movably provided with a second mount 10, and the second mount 10 is provided with a focusing mirror 3. Therefore, in the actual use process, the focusing lens 3 is installed and replaced by taking the second mounting seat 10.

Meanwhile, a connecting piece IV 101 is arranged on one side of the second mounting seat 10, the connecting piece IV 101 is in threaded connection with the main body 1, the second mounting seat 10 is limited in movement through the connecting piece IV 101, and the connecting piece IV 101 can be moved after being unscrewed. And the fourth connecting piece 101 also provides a stress point, so that a user can take the second mounting seat 10 through the fourth connecting piece 101.

Further, since the first mounting seat 20 and the second mounting seat 10 may have a protective mirror structure as described below, the entire unit and the unit can be extracted separately.

As shown in fig. 9, the structure of the nozzle 4: first, a connection seat 9 is disposed between the nozzle 4 and the body 1, and the nozzle 4 is movably disposed on the connection seat 9. Therefore, in the actual use process, the nozzle 4 is moved up and down, so that the distance between the nozzle 4 and the object is adjusted, the focal length of the focusing lens 3 is adjusted, and the size of the light spot can be adjusted.

Wherein the moving structure of the nozzle 4 is as follows: at first, both sides of the nozzle 4 are provided with the elastic components 6, and both sides of the connecting seat 9 are uniformly provided with the clamping holes 91 along the height direction. Meanwhile, the elastic assembly 6 comprises a moving block 61 and a spring 62, the spring 62 is positioned between the nozzle 4 and the moving block 61, and one end of the moving block 61 is positioned in the clamping hole 91 so as to limit the movement of the nozzle 4.

Thus, in actual use, the nozzle 4 can be moved by pressing the moving block 61 inward so that the moving block 61 moves away from the snap hole 91, with the spring 62 in a compressed state. And when nozzle 4 removed a segment, the movable block 61 can receive the restriction of connecting seat 9 inner wall and can not carry on spacingly to nozzle 4 this moment, until next joint hole 91 appears, the movable block 61 resets because of the elasticity of spring 62 this moment.

Example two: this embodiment is substantially the same as the first embodiment, and is different from the first embodiment in that: the focusing mirror 3 has the following related structure: as shown in fig. 2 to 6, the main body 1 is provided with at least two protective glasses, namely a first protective glass 51 and a second protective glass 52, inside, and the main body 1 is provided with a movable mounting frame 8, and the mounting frame 8 is provided with a movable drawer one 81 and a movable drawer two 82 in sequence from top to bottom.

The first drawer 81 is provided with the focusing lens 3, the first drawer 81 is provided with a first protective lens 51 below the focusing lens 3, and the second drawer 82 is provided with a second protective lens 52.

Therefore, in the actual use process, the focusing mirror 3 can be isolated from the space below the focusing mirror 3 through the first protective mirror 51, so that the focusing mirror 3 is protected, then, the second protective mirror 52 is used for preventing slag splashed in the cutting process from polluting the inside, and double protection is realized due to the existence of the first protective mirror 51 and the second protective mirror 52.

Moreover, because the mounting frame 8 is movable and the first drawer 81 and the second drawer 82 are also movable, the whole body, namely the mounting frame 8, can be taken out during installation, so that installation of each lens is realized, and replacement of one lens, such as the second protective lens 52, can also be realized by taking one drawer, such as the second drawer 82.

Compared with the prior art, for example, the patent number 201921548667X, the installation of the patent requires that the drawers are taken out and the lenses are placed and then put back, so that the installation is troublesome, and the invention is taken out integrally, so that the installation is convenient.

Meanwhile, according to actual requirements, three protective glasses, namely a protective glass I51, a protective glass II 52 and a protective glass III 53 are arranged in the main body 1, the protective glass III 53 is positioned between the protective glass I51 and the protective glass II 52, a movable drawer III 83 is arranged between a drawer I81 and a drawer II 82 on the mounting frame 8, and the drawer III 83 is provided with a protective glass III 53

The third protective mirror 53 is used for achieving triple protection, and also for preventing the focusing mirror 3 from being protected when the second protective mirror 52 is replaced or when the second protective mirror 52 is damaged.

As shown in fig. 2 and 3, the structure between the mounting frame 8 and the main body 1 is: firstly, the upper side and the lower side of the mounting rack 8 are arranged on the main body 1 through the first connecting piece 84, and the first connecting piece 84 is in threaded connection with the main body 1.

Therefore, in actual use, the mounting frame 8 is limited in movement through the first connecting piece 84 and can move after the first connecting piece 84 is unscrewed. And the first connector 84 also provides a point of force so that the user can access the mounting bracket 8 through the first connector 84.

Meanwhile, the structure between the first drawer 81 and the mounting rack 8 is as follows: firstly, one end of the first drawer 81 extends out of the mounting frame 8, and the end extending out is a mounting plate 811, meanwhile, the mounting plate 811 is arranged on the mounting frame 8 through a second connecting piece 85, and the second connecting piece 85 is in threaded connection with the mounting frame 8.

Therefore, in the actual use process, the first drawer 81 is limited by the second connecting piece 85 and can move after the second connecting piece 85 is unscrewed. And the second connecting piece 85 also provides a stress point, so that a user can take the first drawer 81 through the second connecting piece 85. And the structures between the second drawer 82 and the third drawer 83 and the mounting rack 8 are the same as the structures between the first drawer 81 and the mounting rack 8.

As shown in fig. 4-6, the moving structure among the first drawer 81, the mounting rack 8 and the main body 1 is as follows: first, both sides of the first drawer 81 are provided with a first convex strip 812, the mounting frame 8 is provided with a first mounting hole 86 and extends backwards to form a mounting table 87, both sides of the inner wall of the first mounting hole 86 are provided with a first sliding groove 861 matched with the first convex strip 812, and both sides of the mounting table 87 are provided with second convex strips 871.

Simultaneously main part 1 middle part is seted up and is supplied laser transmission's through-hole 11, and main part 1 has seted up mounting hole two 12 and mounting groove respectively in through-hole 11 both sides, and the opening size of mounting hole two 12 is greater than the opening size of mounting groove, and two 12 inner wall both sides of mounting hole are provided with spout two 121 with two 871 looks adaptations of sand grip, and mounting groove inner wall both sides are provided with the spout three with a 812 looks adaptations of sand grip.

Therefore, in the actual use process, the convex strips are matched with the sliding grooves to move, and the mounting table 87 is arranged, so that the contact area can be increased, and the stability of connection between the mounting frame 8 and the drawer 81 and the main body 1 can be guaranteed.

As shown in fig. 7, a first placing frame 813 and a second placing frame 814 are arranged in the first drawer 81, two sides of the first drawer 81 are both provided with a long hole 815, and the first placing frame 813 and the second placing frame 814 are respectively used for placing the focusing mirror 3 and the first protective mirror 5.

Meanwhile, the first placing frame 813 is movably arranged in the first drawer 81, the two ends of the first placing frame 813 are respectively provided with the mounting rod 816, one end of the mounting rod 816 is in threaded connection with the first placing frame 813, the other end of the mounting rod 816 penetrates through the long strip hole 815 and is provided with the abutting portion 8161, and the inner wall of the abutting portion 8161 abuts against the outer side of the first drawer 81.

Therefore, in the actual use process, the inner wall of the abutting part 8161 abuts against the outer side of the first drawer 81 to limit the position, and the mounting rod 816 is unscrewed, so that the abutting part 8161 is far away from the outer side of the first drawer 81 to enable the mounting rod 816 to move up and down.

And because thereby the reciprocating of the up-and-down drive rack 813 of installation pole 816, and then drive reciprocating of focusing mirror 3, so can realize the position control to focusing mirror 3, and then can adjust the light spot size.

And the second placing frame 814 can also be set to have the same structure as the first placing frame 813, so that the first protective lens 5 can move along with the movement of the focusing lens 3, and the focusing lens 3 can be better protected.

Example three: this embodiment is substantially the same as the first embodiment, and is different from the first embodiment in that: related structure of the collimator lens 2: first, the main body 1 includes an upper portion 13 and a lower portion connected to each other, and a third rack 30 for placing the collimator lens 2 is built in the upper portion 13, and the third rack 30 is movably disposed in the upper portion 13. Wherein the upper part 13 and the lower part are interconnected for corresponding movement structures to facilitate mounting of the collimator lens 2.

The removal structure of rack three 30 simultaneously does: firstly, an annular groove 131 is formed in the upper portion 13, a worm wheel 132 is arranged in the annular groove 131, a driving piece 133 and a worm 135 are respectively connected to two sides of the worm wheel 132, and the bottom of the worm wheel 132 is connected with the third rack 30 through a connecting rod 134. And a cover 136 is provided on the top of the annular groove 131 to shield and protect the internal components, and also to facilitate installation.

The driving member 133 can be a motor, and a driving wheel 1311 is sleeved on a driving shaft of the motor, and the driving wheel 1311 is engaged with the worm wheel 132. Therefore, in the actual use process, the driving wheel 1311 can be driven to rotate by the driving part 133, so that the worm wheel 132 is driven to rotate, and then the rack three 30 is driven to move up and down by the cooperation of the worm wheel 132 and the worm 135.

Therefore, different materials can be cut by moving the collimating mirror 2 up and down. Meanwhile, the moving structure of the collimating mirror 2 can also be set to be the same as that of the first placing frame 813, so that the collimating mirror 2 is movably arranged on the upper part 13. Compared with the prior art, the driving device 133 is automatic, so that the precision is higher, and the structure is relatively complex, so that the driving device can be selected according to actual conditions.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. While the present invention is not limited to the above-described embodiments, various changes and modifications may be made without departing from the spirit and scope of the invention, and these changes and modifications are intended to be included within the scope of the invention as claimed.

Claims

1. A four-kilowatt high-power laser cutting head, comprising:

the laser device comprises a main body (1), wherein one end of the main body (1) is a laser inlet end, the other end of the main body is a nozzle (4) for outputting laser, a collimating lens (2) and a focusing lens (3) are arranged in the main body (1), and laser with power of four ten-thousand watts enters from the inlet end and sequentially passes through the collimating lens (2) and the focusing lens (3) and then is output from the nozzle (4);

the focal length of the collimating lens (2) is 100mm, and the focal length of the focusing lens (3) is 300mm;

the height sizes of the collimating mirror (2) and the focusing mirror (3) are 50.8mm;

the main body (1) is at least internally provided with two protective glasses which are a protective glass I (51) and a protective glass II (52), the main body (1) is provided with a movable mounting rack (8), and the mounting rack (8) is sequentially provided with a movable drawer I (81) and a movable drawer II (82) from top to bottom;

the first drawer (81) is provided with the focusing mirror (3), the first drawer (81) is provided with a first protective mirror (51) below the focusing mirror (3), and the second drawer (82) is provided with a second protective mirror (52);

a connecting seat (9) is arranged between the nozzle (4) and the main body (1), the nozzle (4) is movably arranged on the connecting seat (9), elastic components (6) are arranged on two sides of the nozzle (4), and clamping holes (91) are uniformly formed in two sides of the connecting seat (9) along the height direction;

the elastic component (6) comprises a moving block (61) and a spring (62), the spring (62) is located between the nozzle (4) and the moving block (61), one end of the moving block (61) is located in the clamping hole (91) so as to limit the movement of the nozzle (4), and the moving block (61) is pressed inwards so as to enable the moving block (61) to leave the clamping hole (91) and further move the nozzle (4).

2. The high power laser cutting head of four-ten-thousand watts according to claim 1, wherein: the main part (1) embeds there is three protective glass, and it is protective glass one (51), protective glass two (52) and protective glass three (53) respectively, and protective glass three (53) are located between protective glass one (51) and protective glass two (52), mounting bracket (8) are provided with mobilizable drawer three (83) between drawer one (81) and drawer two (82), and drawer three (83) set up protective glass three (53).

3. A high power laser cutting head of forty-thousand watts according to claim 1 or 2, wherein: the upper side and the lower side of the mounting rack (8) are arranged on the main body (1) through a first connecting piece (84), and the first connecting piece (84) is in threaded connection with the main body (1);

or/and one end of the first drawer (81) extends out of the mounting rack (8), the end extending out of the first drawer is a mounting plate (811), the mounting plate (811) is arranged on the mounting rack (8) through a second connecting piece (85), and the second connecting piece (85) is in threaded connection with the mounting rack (8).

4. A high power laser cutting head of four watts according to claim 1 or 2, characterized in that: the two sides of the first drawer (81) are provided with first convex strips (812), the mounting frame (8) is provided with a first mounting hole (86) and extends backwards to form a mounting table (87), two sides of the inner wall of the first mounting hole (86) are provided with first sliding grooves (861) matched with the first convex strips (812), and two sides of the mounting table (87) are provided with second convex strips (871);

main part (1) middle part is seted up and is supplied laser transmission's through-hole (11), and main part (1) has seted up mounting hole two (12) and mounting groove respectively in through-hole (11) both sides, and the opening size of mounting hole two (12) is greater than the opening size of mounting groove, mounting hole two (12) inner wall both sides are provided with spout two (121) with two (871) looks adaptations of sand grip, and mounting groove inner wall both sides are provided with the spout three with sand grip one (812) looks adaptation.

5. A high power laser cutting head of four watts according to claim 1 or 2, characterized in that: a first placing frame (813) and a second placing frame (814) are arranged in the first drawer (81), two sides of the first drawer (81) are respectively provided with a long hole (815), and the first placing frame (813) and the second placing frame (814) are respectively used for placing a focusing mirror (3) and a first protective mirror (51);

the first (813) rack is moved and is set up in the first (81) drawer, and the first (813) rack both ends all are provided with installation pole (816), installation pole (816) one end and the first (813) rack threaded connection, and installation pole (816) other end pass rectangular hole (815) and be provided with and lean on portion (8161), and lean on portion (8161) inner wall and lean on in the first (81) drawer outside, thereby make through unscrewing installation pole (816) and lean on portion (8161) and keep away from the first (81) drawer outside and then make installation pole (816) reciprocate.

6. A high power laser cutting head of four watts according to claim 1 or 2, characterized in that: the collimating lens (2) and the focusing lens (3) are movably arranged in the main body (1), the main body (1) is movably provided with a first mounting seat (20), and the first mounting seat (20) is provided with the collimating lens (2);

or, main part (1) includes interconnect's upper portion (13) and lower part, and upper portion (13) embeds there is three (7) of rack that are used for placing collimating mirror (2), and rack three (7) remove to set up in upper portion (13), annular groove (131) have been seted up to upper portion (13) inside, and annular groove (131) embeds there is worm wheel (132), worm wheel (132) both sides are connected with driving piece (133) and worm (135) respectively, and worm wheel (132) bottom is connected with rack three (7) through connecting rod (134), thereby orders about worm wheel (132) and worm (135) cooperation through driving piece (133) and drive rack three (7) and reciprocate.