Mechanism for absorbing stray light of laser

Abstract

The utility model discloses a mechanism for absorbing stray light of laser, which comprises a fixed seat provided with a first light path channel and a mounting main body provided with a second light path channel, the laser transmitter is arranged on the fixing base, the protective mirror is arranged in the first light path channel, the beam expanding mirror and the focusing mirror are sequentially arranged in the second light path channel in the light path direction, and the second light path is in vertical butt joint with the first light path. The device further comprises a light absorption base arranged in the second light path channel and located between the protection lens and the beam expanding lens, the light absorption base is provided with a through hole concentric with the second light path channel, the installation body and the light absorption base form an annular cavity water channel, and the installation body is provided with a water inlet pipeline communicated with the annular cavity water channel. A first black hard oxidation coating is arranged on the inner wall of the through hole. The laser processing device has the advantages that stray light in the laser processing process can be absorbed and dissipated in time through the structural design and the specific implementation mode of the light absorption base and the annular cavity water channel, and the service life of the lens and the laser transmitter is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of laser equipment, in particular to a mechanism for absorbing laser stray light. Background Art

[0002] In recent years, the laser cutting industry has developed rapidly, and domestic laser cutting is still showing a rapid growth trend. The existing laser cutting machine market has gradually replaced the traditional cutting process in the cutting industry due to its fast cutting speed, high cutting efficiency and few quality problems. It is deeply recognized by customers and the domestic market is very considerable.

[0003] As the laser cutting market in China is getting bigger and bigger, the cutting power is also increasing year by year. The power of the laser cutting equipment that has been mass-produced and released on the market has reached 120KW, and some manufacturers have also demonstrated 200KW or even higher power laser cutting equipment. With the gradual increase in power, the stray light processing inside the laser cutting head is facing great challenges.

[0004] Definition of scattered light: When a beam of parallel monochromatic light is irradiated on a sample, most of the light passes through the solution, and a small part of the light scatters at different angles due to the collision between the photons and the molecules of the substance, which changes the direction of the photons' movement. This light is called scattered light.

[0005] Traditional low-power cutting heads do not have a stray light processing structure. When a laser transmitter with excessive power passes through the laser head, it is easy to cause damage to the laser lens. In serious cases, it can directly lead to the scrapping of the laser head or laser transmitter, increasing maintenance costs and seriously affecting customer experience.

[0006] In view of this, it is necessary to provide a mechanism for absorbing laser stray light. Summary of the invention

[0007] The utility model provides a mechanism for absorbing laser stray light, which effectively solves the adverse effects of existing laser astigmatism on lenses, laser heads or laser transmitters.

[0008] The technical solution adopted by the utility model is

[0009] A mechanism for absorbing laser stray light, comprising a fixing seat provided with a No. 1 optical path channel, a mounting body provided with a No. 2 optical path channel, a laser emitter provided on the fixing seat, a protective mirror provided in the No. 1 optical path channel, a beam expander and a focusing mirror provided in the No. 2 optical path channel in sequence along the optical path direction, wherein the No. 2 optical path is vertically butted with the No. 1 optical path. It also comprises a light absorbing seat provided in the No. 2 optical path channel and between the protective mirror and the beam expander, wherein the light absorbing seat is provided with a through hole concentric with the No. 2 optical path channel, wherein the mounting body and the light absorbing seat form an annular water channel, wherein a water inlet pipeline communicating with the annular water channel is provided on the mounting body, and a No. 1 black hard oxidation coating is provided on the inner wall of the through hole.

[0010] Furthermore, the through hole includes a No. 1 hole that shrinks toward one side of the beam expander and a No. 2 hole that spreads toward the beam expander, and the shrinking side of the No. 1 hole is connected to the shrinking side of the No. 2 hole.

[0011] Furthermore, the lower end surface of the light absorbing seat is provided with a second black hard oxidation coating.

[0012] Furthermore, the installation body includes a cylindrical body and a stainless steel water cooling seat, the cylindrical body is provided with a step for installing the stainless steel water cooling seat and the light absorbing seat, and the stainless steel water cooling seat and the light absorbing seat form an annular water channel.

[0013] Furthermore, a No. 1 sealing ring is arranged between the stainless steel water cooling seat and the fixed seat, a No. 2 sealing ring is arranged between the light absorbing seat and the fixed seat, a No. 3 sealing ring is arranged between the side of the stainless steel water cooling seat and the side of the light absorbing seat, and a No. 4 sealing ring is arranged between the end of the stainless steel water cooling seat and the light absorbing seat.

[0014] Beneficial effects of the utility model: The structural design and specific implementation methods of the light absorption seat and the annular cavity water channel can realize timely absorption and heat dissipation of stray light in the laser processing process, thereby enhancing the service life of the lens and the laser transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a mechanism for absorbing laser stray light provided in an embodiment of the present application.

[0016] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle.

[0017] Figure 3 A cross-sectional view of a light absorbing seat, a water cooling pipeline and a mounting body for absorbing laser stray light provided in an embodiment of the present application.

[0018] The markings in the figure are: 1. fixing seat; 2. mounting body; 3. laser emitter; 4. protective mirror; 5. beam expander; 6. focusing mirror; 7. light absorption seat; 601. through hole; 101. optical path channel No. 1; 201. optical path channel No. 2; 8. water inlet pipe; 9. annular water channel; 6011. hole No. 1; 6012. hole No. 2; 21. cylindrical body; 22. stainless steel water cooling seat; 11. sealing ring No. 1; 12. sealing ring No. 2; 13. sealing ring No. 3; 14. sealing ring No. 4. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, an embodiment of the present application provides a mechanism for absorbing laser stray light, and its structure includes a fixing seat 1 provided with a No. 1 optical path channel 101, a mounting body 2 provided with a No. 2 optical path channel 201, a laser emitter 3 arranged on the fixing seat 1, a protective mirror 4 arranged in the No. 1 optical path channel 101, a beam expander 5 and a focusing mirror 6 arranged in the No. 2 optical path channel 201 in sequence along the optical path direction, the No. 2 optical path is vertically connected to the No. 1 optical path, and is characterized in that: it also includes a light absorbing seat 7 arranged in the No. 2 optical path channel 201 and located between the protective mirror 4 and the beam expander 5, the light absorbing seat 7 is provided with a through hole 601 concentric with the No. 2 optical path channel 201, the mounting body 2 and the light absorbing seat 7 form an annular water channel 9, the mounting body 2 is provided with a water inlet pipe 8 connected to the annular water channel 9, and the inner wall of the through hole 601 is provided with a No. 1 black hard oxidation coating.

[0021] It should be noted that during the process of cutting the workpiece, the laser will pass through the laser emitter 3, through the protective lens 4, the beam expander 5, and the focusing lens 6 in sequence, and then reach the surface of the workpiece. During the cutting process, more than 99.5% of the laser will pass through the cutting head within the divergence half angle α and reach the cutting surface. In addition, there is 0.5% of stray light distributed outside the optical path diagram. The energy carried by these stray lights increases with the increase of laser power. When the energy of the stray light is too large, if it is not absorbed and processed in time, it will cause damage to the cutting quality and even the cutting head or the laser emitter 3 itself.

[0022] In actual use, the laser emitter 3 emits laser, so that the laser passes through the No. 1 optical path channel 101 and the No. 2 optical path channel 201 in sequence. When the laser passes through the No. 2 channel, it absorbs part of the heat through the No. 1 black hard oxide coating. At the same time, the cooling water in the annular water channel 9 takes away the heat absorbed by the No. 1 black hard oxide coating in time.

[0023] In the above design, the structural design and specific implementation of the light absorption seat 7 and the annular water channel 9 can realize timely absorption and heat dissipation of stray light during laser processing, thereby enhancing the service life of the lens and the laser emitter 3.

[0024] Specifically: Figure 3 As shown, the through hole 601 includes a No. 1 hole 6011 that shrinks toward the side of the beam expander 5 and a No. 2 hole 6012 that spreads toward the beam expander 5, and the shrinking side of the No. 1 hole 6011 is connected to the shrinking side of the No. 2 hole.

[0025] In actual use, the laser first passes through hole No. 1 6011 and then enters hole No. 2 6012. Before the light path reaches the collimator 5, a part of the scattered light is absorbed by the black hard oxide coating No. 1 located on the inner wall of hole No. 1 6011. When the light path reaches the collimator 5 and the focusing lens 6, the reflected scattered light is partially absorbed by the black hard oxide coating No. 1 on the inner wall of hole No. 2.

[0026] In the above design, the structural design of the through hole 601 can absorb both incident and reflected stray light.

[0027] Specifically, the lower end surface of the light absorbing seat 7 is provided with a second-grade black hard oxidation coating.

[0028] In actual use, when the light path reaches the beam expander 5 and the focusing lens 6, part of the reflected scattered light is absorbed by the No. 2 black hard oxide coating.

[0029] In the above design, the No. 2 black hard anodized coating can cooperate with the No. 1 black hard anodized coating to absorb most of the stray light during reflection.

[0030] Specifically: Figure 1 and Figure 2 As shown, the installation body 2 includes a cylindrical body 21 and a stainless steel water cooling seat 22 , the cylindrical body 21 is provided with a step for installing the stainless steel water cooling seat 22 and the light absorbing seat 7 , and the stainless steel water cooling seat 22 and the light absorbing seat 7 form an annular water channel 9 .

[0031] In actual use, the heat is taken away by the cooling water in the annular water channel 9.

[0032] In the above design, the stainless steel water cooling seat 22 is not easy to generate scale, and can effectively prevent the annular cavity water channel 9 from being blocked.

[0033] Specifically: Figure 2As shown, a No. 1 sealing ring 11 is arranged between the stainless steel water cooling seat 22 and the fixed seat 1, a No. 2 sealing ring 12 is arranged between the light absorbing seat 7 and the fixed seat 1, a No. 3 sealing ring 13 is arranged between the side of the stainless steel water cooling seat 22 and the side of the light absorbing seat 7, and a No. 4 sealing ring 14 is arranged between the end of the stainless steel water cooling seat 22 and the light absorbing seat 7.

[0034] In the above design, the No. 1 sealing ring 11 can ensure the sealing between the stainless steel water cooling seat 22 and the fixed seat 1, the No. 2 sealing ring 12 can effectively ensure the sealing between the light absorbing seat 7 and the fixed seat 1, and the No. 3 sealing ring 13 and the No. 4 sealing ring 14 can effectively ensure the sealing between the stainless steel water cooling seat 22 and the light absorbing seat 7.

[0035] To further explain in detail, it should be understood that the above is only a specific embodiment of the present invention and is 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 mechanism for absorbing laser stray light, comprising a fixing seat (1) provided with a first optical path channel (101), a mounting body (2) provided with a second optical path channel (201), a laser emitter (3) arranged on the fixing seat (1), a protective mirror (4) arranged in the first optical path channel (101), and a beam expander (5) and a focusing mirror (6) arranged in sequence in the second optical path channel (201) along the optical path direction, wherein the second optical path is vertically connected to the first optical path, and characterized in that: The invention also comprises a light absorbing seat (7) arranged in the second optical path channel (201) and located between the protective mirror (4) and the beam expander (5); the light absorbing seat (7) is provided with a through hole (601) concentric with the second optical path channel (201); the installation body (2) and the light absorbing seat (7) form an annular water channel (9); the installation body (2) is provided with a water inlet pipeline (8) connected to the annular water channel (9); and the inner wall of the through hole (601) is provided with a first black hard oxidation coating.

2. The mechanism for absorbing laser stray light according to claim 1, characterized in that: The through hole (601) comprises a first hole (6011) that contracts toward one side of the beam expander (5) and a second hole (6012) that spreads toward the beam expander (5), and the contracted side of the first hole (6011) is in conduction with the contracted side of the second hole (6012).

3. The mechanism for absorbing laser stray light according to claim 1, characterized in that: The lower end surface of the light absorbing seat (7) is provided with a second-grade black hard oxidation coating.

4. The mechanism for absorbing laser stray light according to claim 1, characterized in that: The installation body (2) comprises a cylindrical body (21) and a stainless steel water cooling seat (22); the cylindrical body (21) is provided with a step for installing the stainless steel water cooling seat (22) and the light absorbing seat (7); the stainless steel water cooling seat (22) and the light absorbing seat (7) form an annular water channel (9).

5. The mechanism for absorbing laser stray light according to claim 4, characterized in that: A first sealing ring (11) is arranged between the stainless steel water cooling seat (22) and the fixed seat (1), a second sealing ring (12) is arranged between the light absorbing seat (7) and the fixed seat (1), a third sealing ring (13) is arranged between the side of the stainless steel water cooling seat (22) and the side of the light absorbing seat (7), and a fourth sealing ring (14) is arranged between the end of the stainless steel water cooling seat (22) and the light absorbing seat (7).

Images