A laser anti-back-reflection device

Abstract

The present invention belongs to the technical field of lasers, and particularly relates to a laser anti-back-reflection device, which includes a transmitting head, an anti-reflection ring, and a pair of lifting mechanisms; a connecting head is connected to the transmitting head, and a pair of lenses are provided inside the transmitting head; the anti-reflection ring is arranged inside the transmitting head and on the side of the lens away from the connecting head. A through hole is provided through the center of the anti-reflection ring, and a cavity is provided inside the anti-reflection ring. A liquid inlet pipe and a liquid outlet pipe are connected to the anti-reflection ring, and both the liquid inlet pipe and the liquid outlet pipe are communicated with the cavity; a pair of lifting mechanisms are symmetrically installed on the side wall of the transmitting head, and the lifting mechanism is used to finely adjust the anti-reflection ring. Through the setting of corresponding mechanisms, the present invention can efficiently filter the reflected laser, effectively avoid the problem of the reflected laser damaging the device, and at the same time, the reflected laser will not enter the inside of the transmitting head again, avoiding secondary high temperature of the transmitting head, thereby greatly reducing the failure rate of the transmitting head and ensuring the service life of the transmitting head.

Description

Technical Field

[0001] The present invention belongs to the technical field of lasers, and particularly relates to a laser anti-back-reflection device. Background Art

[0002] A laser is a device that uses the principle of stimulated emission to amplify or oscillate and emit light in some excited substances. A laser generally consists of three parts: an excitation system, a laser medium, and an optical resonator. The excitation system is used to provide energy so that most electrons in the laser medium absorb energy and jump to the outer orbital of the atom, creating conditions for emitting laser light later. The laser medium is the substance used to generate laser light. The optical resonator is used to enhance the brightness of the output laser and regulate and select the wavelength and direction of light. Due to many advantages such as low cost and high precision, lasers are widely used in various fields such as industry, precision measurement and detection, communication and information processing, medical treatment, and military.

[0003] Among them, laser welding is a welding method using the principle of a laser. Due to the optical properties of lasers such as refraction and focusing, laser welding is very suitable for welding micro-parts and parts with very poor accessibility. However, when laser welding is in use, especially when welding workpieces with a relatively high reflectivity, the laser is easily reflected by the workpiece, which not only easily affects the normal welding effect of the laser, but also the reflected laser is easily damaged to the equipment, causing damage to the laser welding equipment, and there are certain limitations.

[0004] For this reason, laser anti-back-reflection devices have emerged on the market. For example, the Chinese invention patent with the publication number: CN108705192A discloses an anti-back-reflection device for a laser system. The device includes a filtering component and an offset component. The filtering component includes a pair of lenses and a pinhole aperture, and the pinhole aperture is used to block the reflection of the laser, which can play a role in anti-back-reflection to a certain extent. However, when the device is in use, only relying on the pinhole aperture for anti-reflection, there is a problem of poor anti-back-reflection efficiency. At the same time, the pinhole aperture is arranged between a pair of lenses, and the reflected laser needs to enter the inside of the emitting head to be blocked. The reflected laser entering the inside of the emitting head will also increase the temperature inside the emitting head, greatly increasing the probability of high-temperature damage to the emitting head and shortening the service life of the emitting head.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a laser anti-back-reflection device. Summary of the Invention

[0006] The purpose of the present invention is to provide a laser anti-back-reflection device to solve the problem of poor use effect of the above-mentioned laser anti-back-reflection device.

[0007] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0008] A laser anti-back-reflection device, comprising a transmitting head, an anti-reflection ring and a pair of lifting mechanisms;

[0009] A connecting head is connected to the transmitting head, and a pair of lenses are provided in the transmitting head;

[0010] The anti-reflection ring is arranged in the transmitting head and on the side of the lens away from the connecting head. A through hole is provided through the center of the anti-reflection ring, and a cavity is provided in the anti-reflection ring. A liquid inlet pipe and a liquid outlet pipe are connected to the anti-reflection ring, and both the liquid inlet pipe and the liquid outlet pipe are communicated with the cavity;

[0011] A pair of the lifting mechanisms are symmetrically installed on the side wall of the transmitting head, and the lifting mechanisms are used for finely adjusting the anti-reflection ring.

[0012] Furthermore, a pair of sliding grooves are provided on the inner wall of the transmitting head for the sliding of the sliders. The sliding grooves are arranged below the lenses;

[0013] Sliders are slidably arranged in the sliding grooves, and the sliders are fixedly connected to the anti-reflection ring. The sliders are used to limit the sliding of the anti-reflection ring by sliding in the sliding grooves, avoiding the anti-reflection ring from shifting during fine adjustment in the transmitting head, so as to ensure that the laser beam can pass through the through hole, facilitating better welding work and not affecting the normal use of laser welding.

[0014] Furthermore, a stabilizing ring is provided in the transmitting head. The stabilizing ring is arranged between the lens and the anti-reflection ring. The stabilizing ring is used to stabilize the pulling rope, so that the pulling rope can stably pull the anti-reflection ring, enabling the anti-reflection ring to be stably finely adjusted in the transmitting head and avoiding affecting the laser beam.

[0015] Furthermore, a light sensor is provided on the surface of the anti-reflection ring close to the stabilizing ring. The light sensor is arranged outside the through hole and is used to sense the laser beam, enabling the laser beam to stably pass through the through hole, maximizing the avoidance of the reflected laser affecting the lens, and at the same time avoiding the reflected laser beam entering the transmitting head, causing secondary high temperature in the transmitting head, greatly reducing the failure rate of the transmitting head and ensuring the service life of the transmitting head.

[0016] Furthermore, a reflective film is provided on the surface of the anti-reflection ring away from the stabilizing ring, which is used to further enhance the effect of the anti-reflection ring in blocking the reflected laser and avoid the reflected laser from affecting the lens;

[0017] The reflective film includes a protective film for protecting the absorption film;

[0018] On one side of the protective film close to the anti-reflection ring, there is an absorption film. An absorption liquid is provided inside the absorption film. The absorption liquid can absorb the reflected laser again, and at the same time, the absorption liquid can also absorb the heat generated by the reflected laser, avoiding the high temperature inside the emitting head caused by the reflected laser and reducing the overall failure rate of the emitting head.

[0019] Further, on the side of the absorption film away from the protective film, there is an adhesion layer. The adhesion layer is connected to the anti-reflection ring. The adhesion layer is used to fix the reflective film, so that the reflective film can be fixed on the surface of the anti-reflection ring, and then used to absorb and block the reflected laser.

[0020] Further, a plurality of cooling pipes are connected to the absorption film. The cooling pipes are inserted into the adhesion layer. The cooling pipes are communicated with the inside of the absorption film. When the absorption liquid absorbs the reflected laser, part of the absorption liquid will vaporize. The vaporized absorption liquid enters the cooling pipes. The cooling pipes are in contact with the anti-reflection ring. Since the anti-reflection ring continuously circulates the coolant, the overall temperature of the anti-reflection ring is relatively low, and thus can cool the vaporized absorption liquid in the cooling pipes, making the vaporized absorption liquid turn back into a liquid for the recycling use of the absorption liquid;

[0021] A connecting pipe is connected between a pair of the cooling pipes. The connecting pipe can further cool the vaporized absorption liquid;

[0022] A guiding member is provided inside the connecting pipe to prevent the cooled absorption liquid from remaining in the connecting pipe for the repeated use of the absorption liquid.

[0023] Further, the lifting mechanism includes a box body. The box body is connected to the side wall of the emitting head. The box body is used to install the winding disc and the motor;

[0024] Inside the box body, there are a winding disc and a motor. A belt is connected between the winding disc and the motor. The winding disc is used to wind the pulling rope. The motor drives the winding disc to rotate through the belt.

[0025] Further, a pulling rope is wound around the winding disc. One end of the pulling rope penetrates through the emitting head and the stabilizing ring and is connected to the anti-reflection ring. When the winding disc rotates, the winding disc will wind or release the pulling rope, and thus the anti-reflection ring can be lifted or lowered to enable the laser beam to better pass through the through hole for welding work.

[0026] Further, a pair of fixed pulleys are provided inside the emitting head. The pair of fixed pulleys respectively correspond to the pair of pulling ropes. The fixed pulleys are used to guide the movement of the pulling ropes, avoiding abrasion between the fixed pulleys and the stabilizing ring, and thus can improve the service life of the pulling ropes;

[0027] A bracket is connected between the fixed pulley and the inner wall of the emitting head for installing the fixed pulley.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] Through the setting of corresponding mechanisms, the present invention can efficiently filter the reflected laser, effectively avoiding the problem of the reflected laser damaging the equipment. At the same time, the reflected laser will not enter the inside of the transmitting head again, avoiding secondary high temperature of the transmitting head, and thus greatly reducing the failure rate of the transmitting head and ensuring the service life of the transmitting head. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a cross-sectional view of a laser anti-back-reflection device in an embodiment of the present invention;

[0032] Figure 2 It is Figure 1 a schematic structural view of part A in;

[0033] Figure 3 It is Figure 1 a schematic structural view of part B in;

[0034] Figure 4 It is Figure 1 a schematic structural view of part C in;

[0035] Figure 5 It is Figure 1 a schematic structural view of part D in;

[0036] Figure 6 It is a cross-sectional view of a reflective film in an embodiment of the present invention;

[0037] Figure 7 It is Figure 6 a schematic structural view of part E in;

[0038] Figure 8 It is a three-dimensional view of a laser anti-back-reflection device in an embodiment of the present invention;

[0039] Figure 9 It is another three-dimensional view of a laser anti-back-reflection device in an embodiment of the present invention.

[0040] In the figure: 1. Emitter head, 101. Connector, 102. Lens, 103. Slide groove, 104. Slide block, 105. Stabilizing ring, 2. Anti-reflection ring, 201. Through hole, 202. Cavity, 203. Liquid inlet pipe, 204. Liquid outlet pipe, 205. Light sensor, 206. Reflective film, 2061. Protective film, 2062. Absorption film, 2063. Absorbing liquid, 2064. Adhesive layer, 2065. Cooling pipe, 2066. Connecting pipe, 2067. Guide. Detailed implementation manners

[0041] The present invention will be described in detail below in conjunction with the various implementation manners shown in the accompanying drawings. However, these implementation manners do not limit the present invention, and any structural, method or functional transformation made by those of ordinary skill in the art based on these implementation manners is included in the protection scope of the present invention.

[0042] The present invention discloses a laser anti-back reflection device. Refer to Figures 1 - 9 as shown, it includes an emitter head 1, an anti-reflection ring 2 and a pair of lifting mechanisms 3.

[0043] Among them, a connector 101 is connected to the emitter head 1 for connecting the emitter head 1 to a laser, so that laser welding work can be realized.

[0044] Preferably, the emitter head 1 can be connected to a high-power semiconductor laser or a fiber laser.

[0045] In addition, the connector 101 is a QBH connector. The collimation distance of the QBH connector can be finely adjusted, and the QBH interface can be seamlessly connected to the fiber laser. In addition, the QBH connector adopts a sealed dust-proof design, which can improve the service life of the lens 102.

[0046] Specifically, a pair of lenses 102 are provided inside the emitter head 1 to refract the laser by using the lenses 102.

[0047] Preferably, the focal length range of the lens 102 is 120-230 mm. Both sides of the lens 102 are coated with an anti-reflection film, and the transmittance of the anti-reflection film is greater than 99.8%.

[0048] In addition, a pair of slide grooves 103 are provided on the inner wall of the emitter head 1. The slide grooves 103 are arranged below the lens 102 for the sliding of the slide block 104, so as to adjust the position of the anti-reflection ring 2 in the emitter head 1, so that the laser can better pass through the through hole 201.

[0049] Furthermore, a slider 104 is slidably arranged in the chute 103, and the slider 104 is fixedly connected to the anti-reflection ring 2. The slider 104 is used to slide in the chute 103 to limit the sliding of the anti-reflection ring 2, preventing the anti-reflection ring 2 from shifting during fine adjustment in the transmitting head 1, so as to ensure that the laser beam can pass through the through hole 201, facilitating better welding work and not affecting the normal use of laser welding.

[0050] Reference Figures 1 - 9 As shown, a stabilizing ring 105 is arranged in the transmitting head 1, and the stabilizing ring 105 is arranged between the lens 102 and the anti-reflection ring 2. The stabilizing ring 105 is used to stabilize the pull rope 305, so that the pull rope 305 can stably pull the anti-reflection ring 2, enabling the anti-reflection ring 2 to be finely adjusted stably in the transmitting head 1 and preventing the laser beam from being affected.

[0051] Reference Figures 1 - 9 As shown, the anti-reflection ring 2 is arranged in the transmitting head 1 and on the side of the lens 102 away from the connector 101. The anti-reflection ring 2 is used to block the reflected laser, preventing the reflected laser from affecting the lens 102 and other components in the transmitting head 1.

[0052] Preferably, the shape of the anti-reflection ring 2 refers to Figure 1 As shown, the anti-reflection ring 2 is made of sapphire material, which can ensure the absorption effect of the anti-reflection ring 2 on the reflected laser.

[0053] Among them, a through hole 201 is provided through the center of the anti-reflection ring 2. The through hole 201 is used for the laser beam to pass through. The aperture of the through hole 201 is 2 mm, so that the large-angle reflected laser cannot pass through the through hole 201, ensuring the blocking effect of the anti-reflection ring 2 on the reflected laser.

[0054] In addition, a cavity 202 is arranged in the anti-reflection ring 2 to facilitate the passage of cooling water, so as to cool the entire anti-reflection ring 2 and prevent the anti-reflection ring 2 from deforming due to high temperature, ensuring that the anti-reflection ring 2 can normally block the reflected laser.

[0055] Specifically, a liquid inlet pipe 203 and a liquid outlet pipe 204 are connected to the anti-reflection ring 2, and both the liquid inlet pipe 203 and the liquid outlet pipe 204 are communicated with the cavity 202. The cooling water enters the cavity 202 through the liquid inlet pipe 203 and then is discharged through the liquid outlet pipe 204. The anti-reflection ring 2 is cooled by the circulating cooling water, greatly improving the cooling effect of the anti-reflection ring 2.

[0056] In addition, a photosensor 205 is provided on one side of the anti-reflection ring 2 close to the stable ring 105, and the photosensor 205 is arranged outside the through hole 201. The photosensor 205 is used to sense the laser beam, so that the laser beam can stably pass through the through hole 201, avoiding the blockage of the laser beam by the anti-reflection ring 2. At the same time, it can also prevent the reflected laser beam from entering the transmitting head 1, causing secondary high temperature inside the transmitting head 1, greatly reducing the failure rate of the transmitting head 1 and ensuring the service life of the transmitting head 1.

[0057] When adjusting the position of the anti-reflection ring 2, the photosensor 205 can sense the laser beam, and then the position of the anti-reflection ring 2 can be determined. That is, when the laser beam passes through the through hole 201, the photosensor 205 can just recognize the laser beam.

[0058] Reference Figures 1 - 9 As shown, a reflective film 206 is provided on one side of the anti-reflection ring 2 away from the stable ring 105, which is used to further enhance the effect of the anti-reflection ring 2 blocking the reflected laser and avoid the influence of the reflected laser on the lens 102.

[0059] Among them, the reflective film 206 includes a protective film 2061 for protecting the absorption film 2062. The protective film 2061 is made of acrylic resin. An absorption film 2062 is provided on the side of the protective film 2061 close to the anti-reflection ring 2. The absorption film 2062 is a release film, and an absorption liquid 2063 is provided inside the absorption film 2062. The absorption liquid 2063 can absorb the reflected laser, and at the same time, the absorption liquid 2063 can also absorb the heat generated by the reflected laser, avoiding the high temperature inside the transmitting head 1 caused by the reflected laser and reducing the overall failure rate of the transmitting head 1.

[0060] Preferably, the absorption liquid 2063 is water or ethanol.

[0061] In addition, an adhesion layer 2064 is provided on the side of the absorption film 2062 away from the protective film 2061, and the adhesion layer 2064 is connected to the anti-reflection ring 2. The adhesion layer 2064 is used to fix the reflective film 206, so that the reflective film 206 can be fixed on the surface of the anti-reflection ring 2, and then used to absorb and block the reflected laser.

[0062] Specifically, a number of cooling pipes 2065 are connected to the absorption film 2062. The cooling pipes 2065 are inserted into the adhesion layer 2064, and the cooling pipes 2065 are connected to the inside of the absorption film 2062. When the absorption liquid 2063 absorbs the reflected laser, part of the absorption liquid 2063 will vaporize, and the vaporized absorption liquid 2063 enters the cooling pipes 2065. The cooling pipes 2065 are in contact with the anti-reflection ring 2. Since the anti-reflection ring 2 continuously flows with the coolant, the overall temperature of the anti-reflection ring 2 is relatively low, which can then cool the vaporized absorption liquid 2063 in the cooling pipes 2065, making the vaporized absorption liquid 2063 turn back into a liquid for the recycling use of the absorption liquid 2063.

[0063] Preferably, both the cooling pipe 2065 and the connecting pipe 2066 are made of heat-conducting materials for better cooling of the vaporized absorption liquid 2063.

[0064] In addition, a connecting pipe 2066 is connected between a pair of cooling pipes 2065, and the connecting pipe 2066 can further play a role in cooling the vaporized absorption liquid 2063.

[0065] Furthermore, a guiding member 2067 is provided in the connecting pipe 2066 to prevent the cooled absorption liquid 2063 from remaining in the connecting pipe 2066 for the reuse of the absorption liquid 2063.

[0066] Reference Figures 1 - 9 As shown, a pair of lifting mechanisms 3 are symmetrically installed on the side wall of the transmitting head 1. The lifting mechanism 3 is used to finely adjust the anti-reflection ring 2, so that the whole transmitting head 1 can be applicable to different models of lasers, expanding the overall applicable range.

[0067] Among them, the lifting mechanism 3 includes a box body 301, and the box body 301 is connected to the side wall of the transmitting head 1. The box body 301 is used to install the winding disc 302 and the motor 303.

[0068] In addition, a winding disc 302 and a motor 303 are provided in the box body 301, and a belt 304 is connected between the winding disc 302 and the motor 303. The winding disc 302 is used to wind the pulling rope 305, and the motor 303 drives the winding disc 302 to rotate through the belt 304.

[0069] Specifically, a pulling rope 305 is wound around the winding disc 302, and one end of the pulling rope 305 passes through the transmitting head 1 and the stabilizing ring 105 to be connected to the anti-reflection ring 2. When the winding disc 302 rotates, the winding disc 302 will wind or release the pulling rope 305, so as to realize the lifting or lowering of the anti-reflection ring 2, make the whole transmitting head 1 applicable to different models of lasers, expand the overall applicable range, and at the same time, the laser beam can better pass through the through hole 201 for welding work.

[0070] In addition, a pair of fixed pulleys 306 are provided in the transmitting head 1, and the pair of fixed pulleys 306 respectively correspond to a pair of pulling ropes 305. The fixed pulleys 306 are used to guide the movement of the pulling ropes 305 to prevent the fixed pulleys 306 from being worn by the stabilizing ring 105, and thus the service life of the pulling ropes 305 can be prolonged.

[0071] Furthermore, a bracket is connected between the fixed pulley 306 and the inner wall of the transmitting head 1 for installing the fixed pulley 306.

[0072] During specific use, the connecting head 101 is connected to the laser. The laser beam generated by the laser enters the transmitting head 1, is refracted by a pair of lenses 102, and converges on the workpiece to be processed through the through hole 201 on the anti-reflection ring 2.

[0073] When the laser beam encounters reflection when hitting the workpiece to be processed, the laser with a large reflection angle will irradiate on the anti-reflection ring 2. Due to the special shape setting of the anti-reflection ring 2, the blocking effect of the reflected laser can be improved. In addition, the reflected laser will also be absorbed by the absorption liquid 2063 in the absorption film 2062, preventing the reflected laser from passing through the anti-reflection ring 2 and entering the inside of the emitting head 1.

[0074] When the absorption liquid 2063 absorbs the reflected laser, it can also absorb the heat generated by the reflected laser. As the absorption liquid 2063 continuously absorbs the heat of the reflected laser, part of the absorption liquid 2063 will vaporize, and the vaporized absorption liquid 2063 enters the cooling pipe 2065. Since the cooling pipe 2065 is in contact with the anti-reflection ring 2 and the anti-reflection ring 2 has coolant flowing continuously inside, the overall temperature of the anti-reflection ring 2 is relatively low, which can then cool the vaporized absorption liquid 2063 in the cooling pipe 2065, causing the vaporized absorption liquid 2063 to turn back into a liquid for the recycling use of the absorption liquid 2063.

[0075] In addition, part of the vaporized absorption liquid 2063 in the cooling pipe 2065 will also be cooled through the connecting pipe 2066 and then flow back into the absorption film 2062, greatly improving the recycling effect of the absorption liquid 2063.

[0076] Moreover, since the anti-reflection ring 2 is arranged at the port of the emitting head 1, the reflected laser will be blocked at the port, effectively preventing the reflected laser from entering the inside of the emitting head 1, greatly reducing the secondary heat generated by the reflected laser inside the emitting head 1, avoiding damage to the components inside the emitting head 1 due to high temperature, and greatly improving the service life of the emitting head 1.

[0077] When the emitting head 1 is replaced with different lasers, due to different laser beams, the refraction generated by passing through the lens 102 will also be different. In this application, the lifting mechanism 3 can drive the anti-reflection ring 2 to move inside the emitting head 1, and then the position of the anti-reflection ring 2 inside the emitting head 1 can be adjusted, enabling the laser beam to accurately pass through the through hole 201 and focus on the workpiece, preventing the laser beam from being blocked by the anti-reflection ring 2 and ensuring the overall use effect of the emitting head 1.

[0078] When adjusting the position of the anti-reflection ring 2, the motor 303 drives the winding disc 302 to rotate through the belt 304. The rotating winding disc 302 can wind or release the pull rope 305, and the pull rope 305 raises or lowers the anti-reflection ring 2 through the fixed pulley 306. During the process of adjusting the anti-reflection ring 2, the light sensor 205 will also perform light sensing. When the light sensor 205 can just sense the laser beam, stop the operation of the motor 303. At this time, the laser beam can pass through the through hole 201 and focus on the workpiece, thus completing the position adjustment of the anti-reflection ring 2, which is convenient for the user to operate.

[0079] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference numerals in the claims should not be construed as limiting the claims involved.

[0080] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners understandable to those skilled in the art.

Claims

1. A laser anti-back-reflection device, characterized in that, Including: A transmitting head (1), a connector (101) is connected to the transmitting head (1), and a pair of lenses (102) are provided inside the transmitting head (1); An anti-reflection ring (2) is provided inside the transmitting head (1) and on the side of the lens (102) away from the connector (101). A through hole (201) is provided through the center of the anti-reflection ring (2). A cavity (202) is provided inside the anti-reflection ring (2). A liquid inlet pipe (203) and a liquid outlet pipe (204) are connected to the anti-reflection ring (2). Both the liquid inlet pipe (203) and the liquid outlet pipe (204) are communicated with the cavity (202). A stabilizing ring (105) is provided inside the transmitting head (1), and the stabilizing ring (105) is arranged between the lens (102) and the anti-reflection ring (2). A reflective film (206) is provided on the side of the anti-reflection ring (2) away from the stabilizing ring (105). The reflective film (206) includes a protective film (2061). An absorption film (2062) is provided on the side of the protective film (2061) close to the anti-reflection ring (2). An absorption liquid (2063) is provided inside the absorption film (2062). An adhesion layer (2064) is provided on the side of the absorption film (2062) away from the protective film (2061). The adhesion layer (2064) is connected to the anti-reflection ring (2). A plurality of cooling pipes (2065) are connected to the absorption film (2062). The cooling pipes (2065) are inserted into the adhesion layer (2064). The cooling pipes (2065) are communicated with the inside of the absorption film (2062). A connecting pipe (2066) is connected between a pair of the cooling pipes (2065). A guiding member (2067) is provided inside the connecting pipe (2066); A pair of lifting mechanisms (3) are symmetrically installed on the side wall of the transmitting head (1), and the lifting mechanisms (3) are used to finely adjust the anti-reflection ring (2).

2. The anti-back-reflection light device for a laser according to claim 1, wherein, A pair of sliding grooves (103) are provided on the inner wall of the transmitting head (1), and the sliding grooves (103) are arranged below the lens (102). Sliders (104) are slidably arranged inside the sliding grooves (103), and the sliders (104) are fixedly connected to the anti-reflection ring (2).

3. The anti-back-reflection device for a laser according to claim 2, characterized in that, A light sensor (205) is provided on the side of the anti-reflection ring (2) close to the stabilizing ring (105), and the light sensor (205) is arranged outside the through hole (201).

4. The laser anti-back-reflection device according to claim 1, wherein The lifting mechanism (3) includes a box body (301), the box body (301) is connected to the side wall of the transmitting head (1), a winding disc (302) and a motor (303) are provided inside the box body (301), and a belt (304) is connected between the winding disc (302) and the motor (303).

5. The anti-back-reflection light device for a laser according to claim 4, characterized in that, A pull rope (305) is wound around the winding disc (302), and one end of the pull rope (305) passes through the transmitting head (1) and the stabilizing ring (105) and is connected to the anti-reflection ring (2).

6. The laser anti-back reflection device according to claim 5, characterized in that, A pair of fixed pulleys (306) are provided inside the transmitting head (1), and the pair of fixed pulleys (306) respectively correspond to a pair of pulling ropes (305). A bracket is connected between the fixed pulley (306) and the inner wall of the transmitting head (1).

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