WO2020088265A1

WO2020088265A1 - Laser and laser output head thereof

Info

Publication number: WO2020088265A1
Application number: PCT/CN2019/111828
Authority: WO
Inventors: 李刚; 蒋峰
Original assignee: 苏州创鑫激光科技有限公司; 深圳市创鑫激光股份有限公司
Priority date: 2018-10-31
Filing date: 2019-10-18
Publication date: 2020-05-07
Also published as: CN109244804A; CN109244804B

Abstract

A laser and a laser output head (100). The laser output head (100) comprises a water-cooling assembly internally mounted with a laser energy transfer component and performing water cooling on the laser energy transfer component to dissipate heat. The water-cooling assembly comprises a housing (1) and a water-cooled member (13). The water-cooled member (13) is accommodated in the housing (1). The outer wall of the water-cooled member (13) is formed with cooling grooves (131, 132) of a double helix structure. The two cooling grooves (131, 132) are communicated at one end, and a water inlet port and a water outlet port are respectively formed at the other end. The water-cooled member (13) is abutted against and fastened to the inner wall of the housing (1) by means of a convex portion (130), forming the cooling grooves (131, 132), on the outer wall of the water-cooled member (13). The contact area between the cooling water and the water-cooled member (13) is increased, and the heat dissipation efficiency can be improved so that the heat is dissipated timely, and the problem of burning an optical fiber (21) or the laser can be effectively prevented due to the strong return light.

Description

Laser and its laser output head

Technical field

The embodiment of the present application relates to the technical field of laser equipment, in particular to a 10,000-watt high-power laser and its laser output head.

Background technique

As the application of lasers in higher power cutting and welding is becoming more and more popular, the demand for high-power laser output heads of 10,000 watts is increasing. However, most of the current 10,000-watt laser output heads adopt foreign LK-D type structures, which are bulky and complicated. Especially when cutting high-reflectivity materials or welding, burning fibers or lasers often occur due to strong return light. Case.

Application content

The embodiments of the present application provide a high-power laser and its laser output head to solve the above technical problems. By providing a water cooling member with a cooling groove of a double spiral structure, the contact area of the cooling water and the water cooling member is increased, and thus Improve the heat dissipation efficiency to make the heat dissipation timely, which can effectively prevent the problem of burning the fiber or the laser due to the strong return light.

In order to solve the above technical problems, the embodiments of the present application provide a laser output head, which includes a water-cooled component in which a laser energy transmission component is installed and performs water-cooling heat dissipation. The water-cooled component includes a housing and a water-cooled component, and the water-cooled component contains In the outer shell, a cooling groove with a double spiral structure is formed on the outer wall of the water-cooling element, two of the cooling grooves are connected at one end, and a water inlet and a water outlet are formed at the other end, respectively. The convex portion forming the cooling groove on the outer wall is tightly fixed to the inner wall of the housing.

Further, a groove of a double spiral structure is formed on the inner wall of the water-cooling member, and the groove of the double spiral structure is nested correspondingly to the convex portion of the cooling groove forming the double spiral structure.

Further, the laser energy transmission assembly includes an energy transmission fiber, and a quartz end cap disposed in the housing and coaxially disposed with the water cooling member, the quartz end cap includes a frusto-conical section, which is disposed on the A first cylindrical section at the small diameter end of the frusto-conical section and a second cylindrical section provided at the large-diameter end of the frusto-conical section, the first cylindrical section is disposed adjacent to the water-cooling member, and the energy transmission fiber is along the water-cooling After passing through the water-cooled part, the central axis of the part is coaxially connected with the first cylindrical section of the quartz end cap.

Further, the surfaces of the first cylindrical section and the second cylindrical section are polished, the surface of the frustoconical section is frosted and the cone angle is 45 degrees; the first cylindrical section and the frusto The transition between the conical sections is through chamfering.

Further, a hollow diaphragm member is fixed inside the housing, and one end of the diaphragm member is externally formed with a first mounting part adapted to the end structure of the water cooling member, and the other end of the diaphragm member A second mounting portion adapted to the structure of the first cylindrical section, frusto-conical section, and at least part of the second cylindrical section of the quartz end cap is formed inside, and the water cooling member is inserted and fixed to the first mounting section , The first cylindrical section, the frusto-conical section and the second cylindrical section of the quartz end cap are at least partially plugged and fixed to the second mounting portion and are wrapped by the second mounting portion, and the energy-transmitting optical fibers pass through in sequence After passing through the water cooling member and the diaphragm member, the first cylindrical section of the quartz end cap is coaxially welded.

Further, the diaphragm member is made of high thermal conductivity material.

Further, the first mounting part is an annular groove body adapted to the end of the water cooling element, and the water cooling element is inserted and fixed to the first mounting part;

The second mounting portion includes a cylindrical slot adapted to the first cylindrical segment of the quartz end cap, and a frusto-conical slot connected to the cylindrical slot and adapted to the frusto-conical segment of the quartz end cap And a cylindrical slot connected to the frusto-conical slot and adapted to the second cylindrical segment of the quartz end cap;

A fixed frustoconical structure that is hollow and communicates with the cylindrical slot is formed inside one end of the diaphragm member fixing and positioning the water cooling member.

Further, the housing includes a buckle and a main housing assembled at one end of the buckle, an inner wall of the other end of the buckle forms a limit portion, and an end of the second mounting portion of the diaphragm member abuts A contact portion is provided to the limiting portion to prevent its axial movement, and a support portion abutting against the inner wall of the buckling member is formed outside the second mounting portion of the diaphragm member to prevent its radial movement.

Further, an outer wall of one end of the buckling member forming the limit part is equipped with a lens member, and the lens member includes a lens frame mounted on the buckling member and a window piece mounted on the lens frame, The window plate is arranged parallel to the end surface of the second cylindrical section of the quartz end cap; the frame is made of Kovar alloy gold-plated, and the window plate is made of high-purity quartz material plated with a high permeability film;

The lens frame and the window piece are metallized and then welded into the lens piece through gold-tin welding, or the lens frame and the window piece are welded into the lens piece through lead-free low-temperature glass.

Further, the end of the water-cooling member away from the quartz end cap is provided with a stepped round table, the end of the housing is closed by the round table, and the bottom of the round table is provided with a plug extending axially into the water-cooling member A slot, and a light blocking fixing member is inserted and fixed in the slot, and the energy-transmitting optical fiber passes through the light blocking fixing member and the water cooling member in sequence and is coaxially welded with the first cylindrical section of the quartz end cap The light-blocking fixing member is made of Kovar alloy gold-plated, and one end of the light-blocking fixing member inserted into the water cooling member is convexly formed with an arc surface.

Further, a waterproof rubber ring is provided between the casing and the round table;

A waterproof rubber ring is provided between the light blocking fixing member and the round table;

A waterproof rubber ring is arranged between the outer shell and the front end of the water-cooling part.

Further, a section of the energy transmission fiber adjacent to the quartz end cap is formed with a first gradient stripping mode, and a section of the energy transmission fiber located on the light blocking fixture is formed with a second gradient stripping mode, the The first gradient stripping mold and the second gradient stripping mold are formed by the time, length, depth, and separation distance of etching or etching; monitoring is provided at positions of the first gradient stripping mold and the gradient second stripping mold A photoelectric sensor for the intensity of the stripping light and the intensity of the return light; at least a temperature sensor for monitoring the temperature and a temperature control switch for controlling the power on and off according to the temperature are provided on the light blocking fixture.

Further, an optical fiber protection component is provided at the tail of the laser output head, and the optical fiber protection component includes an armor cable covering the energy-transmitting optical fiber located outside the casing, and a first armor cable fixing one end of the armor cable is fixed A sleeve, a second armor cable fixing sleeve fixing the other end of the armor cable, and a spring sleeved on the armor cable between the first armor cable fixing sleeve and the second armor cable fixing sleeve, the second The armor cable fixing sleeve is installed and fixed on the shell.

Further, the water-cooled part is a water-cooled part made of a high thermal conductivity material through black body treatment;

The housing is provided with a water inlet connector connected to the water inlet interface and a water outlet connector connected to the water outlet interface.

To solve the above technical problems, the embodiments of the present application further provide a laser, and the laser includes the laser output head according to any one of the foregoing embodiments.

The laser and the laser output head of the embodiment of the present application have the following beneficial effects:

By providing a water cooling part with a cooling groove with a double spiral structure on the outer wall, the contact area of the cooling water and the water cooling part is increased, the heat dissipation efficiency can be improved to make the heat dissipation timely, and then the fiber or laser can be prevented from burning due to strong return light

In addition, by using water-cooled parts with high thermal conductivity materials and processed by black body, it can improve the laser absorption rate and heat exchange rate, and further promote the timely heat dissipation;

In addition, by arranging the grooves of the double helix structure in the convex portion of the inner wall of the water cooling member corresponding to the double helix structure, the laser absorption surface is doubled, and the concave portion, that is, the groove, forms a laser absorption well structure, forming a black-like body , Can completely absorb the laser light scattered by the stripped energy-transmitting fiber without forming reflection, reduce the damage of the high-reflective laser to the stripped fiber and the tail fiber, and reduce the light energy coupled into the core part by multiple reflections, At the same time, the laser damage caused by the reflected laser to the tail structure parts can be reduced, which can improve the anti-high reaction ability of the entire laser.

BRIEF DESCRIPTION

FIG. 1 is a perspective view of a first example of a laser output head according to an embodiment of the present application.

2 is a cross-sectional view of the laser output head shown in FIG.

FIG. 3 is a perspective view of the water cooling member in the laser output head shown in FIG. 2.

4 is a cross-sectional view of the water-cooling member in the laser output head shown in FIG. 2.

5 is an enlarged schematic view of the quartz end cap in the laser output head shown in FIG. 2.

6 is a perspective view of a diaphragm member in the laser output head shown in FIG. 2.

7 is a cross-sectional view of the diaphragm member shown in FIG. 6.

FIG. 8 is a perspective view of the fastener in the laser output head shown in FIG. 2.

9 is a cross-sectional view of the fastener shown in FIG. 8.

10 is a perspective view of a second example of a laser output head according to an embodiment of the present application.

detailed description

The present application will be described in detail below with reference to the drawings and embodiments.

The "front" and "first" that may be mentioned in the embodiments of this application refer to the output end side in the laser output direction, and the "rear", "end" and "tail" that may be mentioned in the embodiments of this application refer to the laser output direction On the input side.

An embodiment of the present application provides a laser, which is specifically a fiber laser, which includes a laser output head 100 as shown in FIG. 1. The laser and laser output head 100 are particularly suitable for the output of 10,000-watt high-power laser.

As shown in FIG. 2, the laser output direction of the laser output head 100 is from lower left to upper right, and the direction of light return is opposite. The laser output head 100 includes a water-cooled component and a laser energy transmission component installed in the water-cooled component. By cooling and dissipating the laser energy transmission component in time, the water-cooled component can prevent the fiber from burning due to heat accumulation such as light return Or burn the laser.

Continuing to refer to FIG. 2, the water cooling assembly includes a housing 1 and a water cooling member 13 housed in the housing 1. The two are structurally compatible. For example, the housing 1 often has a cylindrical housing space inside, and the water cooling member 13 corresponds to Tubular structure (ie water-cooled tube).

Specifically, referring to FIG. 2 and FIG. 3, the outer wall of the water cooling member 13 is formed with

cooling grooves

131 and 132 of a double spiral structure. The two

cooling grooves

131 and 132 are actually formed by forming a double helix on the outer wall of the water cooling member 13 The convex portion 130 is formed. Wherein, the two

cooling tanks

131 and 132 are connected at one end and form an inlet port and an outlet port respectively at the other end. The selection of the positions of the inlet port and the outlet port may be determined according to requirements. The housing 1 is provided with a water inlet connector 111 connected to the water inlet interface of the water cooling member 13 and a water outlet connector 112 connected to the water outlet interface of the water cooling member 13, the water inlet connector 111 and the water outlet connector 112 are usually connected to the chiller to form a Complete water circulation path. When the water-cooling element 13 is inserted into the housing 1, the convex portion 130 forming a cooling groove on the outer wall closely abuts the inner wall of the housing 1 to achieve fixing, and then the two

cooling grooves

131, 132 and the housing 1 together form two independent Cooling channel for the circulation of cooling liquid such as cold water. Referring to FIG. 3, for example, the cooling fluid first flows upward, and then flows downward. When the cooling fluid flows in from the inlet of the cooling tank 131, it first flows along the cooling tank 131 in one direction (such as upward). The end (such as the top) enters another cooling tank 132 and turns around (downward) to flow, and finally flows out from the water outlet of the cooling tank 132.

By providing the water cooling member 13 with the cooling

grooves

131 and 132 having a double-spiral structure on the outer wall, the contact area of the cooling liquid and the water cooling member 13 is increased, and the cooling liquid can directly impact cool the housing 11, thereby improving the heat dissipation efficiency to make the heat dissipation In time, it can prevent the problem of burning fiber or laser due to strong return light.

In an embodiment, referring to FIG. 2 and FIG. 4, a groove 133 with a double spiral structure is also formed on the inner wall of the water cooling element 13. Optionally, the groove 133 of the double spiral structure is nested in the convex portion 130 of the cooling

grooves

131 and 132 forming the double spiral structure. In this way, the absorption surface of the laser can be multiplied, and the concave portion, that is, the groove 133, can form a laser absorption well structure, thereby forming a black body, which can completely absorb the laser light scattered by the stripped energy transmission fiber 21 without forming Reflection, reduce the damage of stripped fiber and tail fiber caused by high reflection, reduce the light energy of multiple reflections coupled into the core part, and reduce the laser damage caused by the reflected laser to the photoelectric components in the laser, which can improve the entire laser 'S ability to resist high reactions.

In the above embodiment, the inner and outer walls of the water-cooling member 13 are formed with a double-double-spiral structure, which increases the area of the water-cooling surface and the light-absorbing surface while reducing the distance between the water-cooling surface and the light-absorbing surface, which greatly improves heat transfer Rate, increase the cooling effect, and increase the damage threshold of the inner wall of the water-cooling member 13, even if a strong return light is generated, the problem of burning the fiber or the laser will not occur.

In one or more embodiments, the water-cooling member 13 is made of a high thermal conductivity material through a black body treatment. For example, black body treatment can be performed by means of high thermal conductivity materials such as aluminum alloy or copper by long-term anode hard natural oxidation or electroplating gun nickel. This can improve the laser absorption rate and heat exchange rate, and promote timely heat dissipation.

Please refer to FIG. 2 and FIG. 5. The laser energy transmission assembly includes an energy transmission fiber 21 and a quartz end cap 22. The quartz end cap 22 is disposed in the housing 1, and the quartz end cap 22 is disposed coaxially with the water cooling member 13. The quartz end cap 22 is a three-stage structure, which includes a truncated cone section 221, a first cylindrical section 222 disposed at the small diameter end of the truncated cone section 221, and a second cylindrical section 223 disposed at the large diameter end of the truncated cone section 221 Along the laser output direction, the first cylindrical section 222, the frusto-conical section 221 and the second cylindrical section 223 are arranged in sequence. The surfaces of the first cylindrical section 222 and the second cylindrical section 223 are polished, and the diameter accuracy after polishing can reach within plus or minus 5 microns; the surface of the frusto-conical section 221 is matte. The first cylindrical section 222 is disposed adjacent to the water-cooling member 13. The energy-transmitting optical fiber 21 passes through the water-cooling member 13 along the central axis of the water-cooling member 13 and is coaxially connected to the first cylindrical section 222 of the quartz end cap 22. Among them, the quartz end cap 22 is usually made of high-purity quartz material, which has a melting point close to that of the energy transmission optical fiber 21, and then the energy transfer optical fiber 21 and the quartz end cap 22 are preferably fused together by means such as laser welding or discharge welding.

In one or more embodiments, the cone angle of the frusto-conical section 221 is 45 degrees. Since the refractive index of the quartz material is 1.44 near the 1080 nm band, the total reflection angle is 44 degrees. When the returned light is approximately parallel When a small angle is incident on the 45-degree frosted cone surface of the truncated cone section 221, most of the light will form a total reflection on its 45-degree cone surface. After two reflections, it will be reflected back along the original optical path, which greatly improves The ability of the product to resist high return light.

In one or more embodiments, the first cylindrical segment 222 and the frusto-conical segment 221 may be transitioned by a circular arc chamfer 224 to improve the structural strength of the quartz end cap 22.

In a specific embodiment, referring to FIG. 2 and FIG. 6, a diaphragm member 23 made of a material with high thermal conductivity such as red copper plating is fixed in the housing 1, and the diaphragm member 23 has a hollow structure inside. Wherein, one end of the diaphragm member 23 is formed with a first mounting portion 231 adapted to the end structure of the water-cooling member 13, and the other end of the diaphragm member 23 is formed with a first cylindrical section 222 that is compatible with the quartz end cap 22, The frusto-conical section 221 and at least a portion of the second cylindrical section 223 have a second mounting portion 232 that is structurally adapted. The first mounting portion 231 and the second mounting portion 232 are also coaxially disposed.

Wherein, the first mounting portion 231 is an annular groove body adapted to the end of the water cooling element 13, and the water cooling element 13 is inserted and fixed to the first mounting portion 231. As shown in FIG. 7, the second mounting portion 232 includes a cylindrical slot 2321 adapted to the first cylindrical section 222 of the quartz end cap 22, and a truncated head communicating with the cylindrical slot 2321 and the quartz end cap 22 The frusto-conical slot 2322 adapted to the conical section 221 and the cylindrical slot 2323 communicating with the frusto-conical slot 2322 and adapted to the second cylindrical section 223 of the quartz end cap 22, and then quartz The first cylindrical section 222, the frusto-conical section 221, and the second cylindrical section 223 in the end cap 22 are at least partially inserted and fixed to the second mounting portion 232 and are wrapped (laminated) by the second mounting portion 232, and then the energy transmission fiber 21 passes through the water-cooling member 13 and the diaphragm member 23 in turn, and is coaxially welded with the first cylindrical section 222 of the quartz end cap 22. Optionally, the welding point is located in the cylindrical slot 2321. Among them, the second mounting portion 232 of the diaphragm member 23 has a (45 degree) cone surface matching the frusto-conical section 221 of the quartz end cap 22, most of the return light will be frusto-conical in the quartz end cap 22 The cone surface of the segment 221 forms a total reflection, and a small part of the transmitted light is scattered by the cone surface of the frusto-conical segment 221 in the quartz end cap 22 to the cone surface of the diaphragm member 23 which is also 45 degrees provided by the second mounting portion 232 In the above, the light energy density of the return light on the diaphragm member 23 is reduced, the heat dissipation capacity of the quartz end cap 22 is improved, and it is beneficial to alleviate the heat accumulation of the welding point, thereby greatly improving the overall resistance of the laser output head 100 to high return The power of light. In addition, one end of the diaphragm member 23 for fixing and positioning the water-cooling member 13 is formed with a hollow frustoconical structure 234 communicating with the second mounting portion 232 (specifically, the cylindrical slot 2321), and the laser can be radiated to the frustoconical structure In the internal space of the conical structure 234, it is beneficial to alleviate the heat accumulation at the welding point.

The setting of the diaphragm member 23 can not only restrict the beam width of the laser, but also the diaphragm member 23 can make a large surface area contact with the coolant for heat exchange, which greatly improves the laser damage threshold that the diaphragm member 23 can withstand. The diaphragm member 23 can play a role of positioning and fixing the water cooling member 13 and the quartz end cap 22, thereby improving the coaxiality of the laser output.

In a specific embodiment, please refer to FIG. 2, FIG. 8 and FIG. 9, the housing 1 includes a fastener 12 and a main housing 11 assembled at one end of the fastener 12, between the fastener 12 and the main housing 11 For example, connect by socket. The inner wall of the other end of the buckling member 12 forms a limiting portion 120, and the end of the second mounting portion 232 of the diaphragm member 23 abuts against the limiting portion 120 to prevent its axial movement. The limiting portion 120 may be, for example, Stepped. Further, a support portion 233 abutting against the inner wall of the buckle 12 is formed outside the second mounting portion 232 of the diaphragm member 23 to prevent its radial movement. The design of the fastener 12 reduces assembly parts, greatly reduces the superposition of machining tolerances, and plays a role in positioning and fixing the diaphragm member 23, which is beneficial to the water cooling member 13 and the quartz end cap 22 in the diaphragm member The positioning and fixing on 23 improves the coaxiality of the laser output. In addition, since the buckle 12 is in contact with the water cooling member 13 and the diaphragm member 23, it is a part of the water cooling assembly, and the coolant can directly impact the cooling buckle 12, which improves the heat dissipation of the quartz end cap 22 and reduces the high-power laser Thermal lens effect.

In a specific embodiment, the outer wall of the end of the buckle 12 forming the limiting portion 120 is equipped with a lens member 4, and the buckle member 12 and the lens member 4 are connected by a buckle, the lens member 4 is opposite to the housing 1 The front end is sealed. The lens element 4 includes a frame 41 mounted on the buckle 12 and a window 42 mounted on the frame 41. The window 42 is disposed parallel to the end surface of the second cylindrical section 223 of the quartz end cap 22. Among them, the frame 41 is made of Kovar alloy plated with gold, and the window plate 42 is made of high-purity quartz material plated with a high permeability film. Further, the lens frame 41 and the window piece 42 are metallized and then welded into the lens element 4 by gold-tin welding, or the lens frame 41 and the window piece 42 are welded into the lens element 4 through lead-free low-temperature glass. The lens element 4 can withstand a pressure of 100N and can withstand a high temperature of 400 degrees, which solves the problems of thread debris and loose shaking caused by high-frequency vibration in the assembly of conventional structures.

In a specific embodiment, as shown in FIGS. 2 and 3, the end of the water cooling member 13 away from the quartz end cap 22 is provided with a stepped round table 134, and the end of the housing 1 is closed by the round table 134. Further, the bottom of the round table 134 is provided There is a slot extending axially into the water cooling member 13, and the light blocking fixing member 3 is inserted and fixed in the slot, and usually the light blocking fixing member 3 is partially inserted into the water cooling member 13. The energy-transmitting optical fiber 21 passes through the light-blocking fixing member 3 and the water-cooling member 13 in sequence and is coaxially fused with the first cylindrical section 222 of the quartz end cap 22.

In one or more embodiments, the light blocking fixture 3 is made of Kovar alloy gold-plated, and the energy transmitting optical fiber 21 can be glued at the tail of the light blocking fixture 3. The thermal expansion coefficient can greatly reduce the influence of the thermal stress of the structural member and the glue on the energy transmission optical fiber 21. Optionally, one end of the light blocking fixing member 3 inserted into the water cooling member 13 is convexly formed with an arc surface, which can reflect the return light to the inner wall of the water cooling member 13 in the form of spherical reflection to reduce the damage of the return light to the tail fiber .

Further, as shown in FIG. 2, a waterproof rubber ring 51 may be provided between the housing 1 and the circular table 134 at the rear end of the water cooling member 13, and a waterproof rubber ring 52 may be provided between the light blocking fixture 3 and the circular table 134 to prevent cooling Liquid leaked from the corresponding contact position. At the same time, a waterproof rubber ring 53 may also be provided between the housing 1 and the front end of the water cooling member 13, specifically between the housing 1 and the diaphragm member 23 (second mounting portion 232), to prevent the cooling liquid from leaking from the corresponding contact position.

In a specific embodiment, the energy transmission fiber 21 has a gradient stripping mode. Specifically, a section of the energy transmission fiber 21 adjacent to the quartz end cap 22 is formed with a first gradient stripping mode, and a section of the energy transmission fiber 21 located on the light blocking fixture 3 is formed with a second gradient stripping mode, the first gradient stripping mode The second gradient stripping pattern is formed by etching, etching time, length, depth, and separation distance.

In one or more embodiments, photoelectric sensors (not shown) for monitoring the intensity of the stripping light and the intensity of the returning light may be provided at the first gradient stripping position and the second gradient stripping position, respectively. The sensor is electrically connected to the external laser main control board when it needs to be used.

Further, referring to FIG. 2 at least, a temperature sensor 61 for monitoring temperature and a temperature control switch for controlling power on and off according to temperature (high temperature power off, low temperature power on) can be provided on the light blocking fixture 3 62. The temperature sensor 61 may be a thermistor. The temperature sensor 61 and the temperature control switch 62 are electrically connected to an external laser main control board when needed. In addition, the aforementioned photo sensor may be installed at the position where the temperature sensor 61 is installed.

In one or more embodiments, as shown in FIG. 10, the tail of the laser output head 100 is provided with an optical fiber protection assembly 7 for protecting the energy transmission optical fiber 21. Specifically, the optical fiber protection assembly 7 includes an armor cable 71 covering the energy-transmitting optical fiber 2121 located outside the housing 11, a first armor cable fixing sleeve 72 that fixes one end of the armor cable 71, and a second armor that fixes the other end of the armor cable 71 The cable fixing sleeve 73 and at least one spring 74 for preventing the armor cable 71 from bending on the armor cable 71 sleeved between the first armor cable fixing sleeve 72 and the second armor cable fixing sleeve 73, the second armor cable fixing sleeve 73 is fixed to the end of the housing 11, that is, the end of the housing 11 close to the light blocking fixture 3.

The embodiments of the present application further provide a laser output head as described in any one of the foregoing embodiments. For the description of the laser output head, please refer to the laser output head mentioned above, and no more details will be given here.

By providing the water cooling member 13 with the cooling

grooves

131 and 132 having a double spiral structure on the outer wall, the contact area of the cooling water and the water cooling member 13 is increased, the heat dissipation efficiency can be improved to make the heat dissipation timely, and thus can prevent the burning of the fiber due to the strong return light Or burn the laser;

In addition, by adopting a high thermal conductivity material for the water-cooling member 13 and treating it with a black body, the laser absorption rate and the heat exchange rate can be improved, which further promotes timely heat dissipation;

In addition, by arranging the grooves 133 of the double helix structure in the inner wall of the water cooling member 13 corresponding to the convex portions 130 of the double helix structure, the laser absorption surface is doubled, and the grooves 133 of the concave portions form the laser absorption well structure , Forming a black-like body, which can completely absorb the laser light scattered by the stripped energy-transmitting optical fiber 21 without forming a reflection, reduce the damage of the high-reflection laser on the stripped fiber and the tail fiber, reduce multiple reflections and couple into the core Part of the light energy, and at the same time reduce the laser damage caused by the reflected laser to the tail structural parts, can improve the resistance of the entire laser to high resistance.

The above are only the embodiments of the present application, and therefore do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the description and drawings of this application, or directly or indirectly used in other related technical fields, The same reason is included in the scope of patent protection of this application.

Claims

A laser output head includes a water-cooled component in which a laser energy transmission component is installed and performs water-cooling heat dissipation, and is characterized by:

The water-cooling assembly includes a housing and a water-cooling member, the water-cooling member is housed in the housing, a cooling groove with a double spiral structure is formed on the outer wall of the water-cooling member, and the two cooling grooves are connected at one end and formed at the other end, respectively The water inlet port and the water outlet port, and the water cooling member is tightly fixed to the inner wall of the housing by means of a protruding portion forming the cooling groove on the outer wall thereof.
The laser output head according to claim 1, wherein:

A groove of a double spiral structure is formed on the inner wall of the water-cooling member, and the groove of the double spiral structure is correspondingly nested in a convex portion of the cooling groove forming the double spiral structure.
The laser output head according to claim 1, wherein:

The laser energy transmission assembly includes an energy transmission fiber and a quartz end cap disposed in the housing and coaxially disposed with the water-cooling member, the quartz end cap includes a frusto-conical section, and a frusto-conical section A first cylindrical section at the small-diameter end of the segment and a second cylindrical section provided at the large-diameter end of the frusto-conical section, the first cylindrical section is disposed adjacent to the water-cooling member, and the energy transmission fiber is along the center of the water-cooling member The shaft is coaxially connected with the first cylindrical section of the quartz end cap after passing through the water cooling member.
The laser output head according to claim 3, wherein:

The surfaces of the first cylindrical section and the second cylindrical section are polished, the surface of the frustoconical section is frosted and the angle of the cone surface is 45 degrees; between the first cylindrical section and the frustoconical section Through the arc chamfering transition.
The laser output head according to claim 3, wherein:

A hollow diaphragm member with a hollow interior is fixed in the housing, a first mounting portion adapted to the end structure of the water-cooling member is formed outside one end of the diaphragm member, and the other end of the diaphragm member is formed inside A second mounting portion adapted to the structure of the first cylindrical section, frusto-conical section and at least part of the second cylindrical section of the quartz end cap, the water-cooling member is plugged and fixed to the first mounting section, the The first cylindrical section, the frusto-conical section and the second cylindrical section of the quartz end cap are at least partially plugged and fixed to the second mounting portion and are wrapped by the second mounting portion, and the energy transmission optical fiber passes through the The water cooling member and the diaphragm member are welded coaxially with the first cylindrical section of the quartz end cap.
The laser output head according to claim 5, wherein:

The diaphragm member is made of high thermal conductivity material.
The laser output head according to claim 5, wherein:

The first mounting portion is an annular groove body adapted to the end of the water cooling element, and the water cooling element is inserted and fixed to the first mounting portion;

The second mounting portion includes a cylindrical slot adapted to the first cylindrical segment of the quartz end cap, and a frusto-conical slot connected to the cylindrical slot and adapted to the frusto-conical segment of the quartz end cap And a cylindrical slot connected to the frusto-conical slot and adapted to the second cylindrical segment of the quartz end cap;

A fixed frustoconical structure that is hollow and communicates with the cylindrical slot is formed inside one end of the diaphragm member fixing and positioning the water cooling member.
The laser output head according to claim 5, wherein:

The housing includes a buckle and a main housing assembled at one end of the buckle, the inner wall of the other end of the buckle forms a limit portion, and the end of the second mounting portion of the diaphragm member abuts The limiting portion is provided to prevent its axial movement, and a support portion abutting against the inner wall of the buckling member is formed outside the second mounting portion of the diaphragm member to prevent its radial movement.
The laser output head according to claim 8, wherein:

An outer wall of one end of the buckling member forming the limit part is equipped with a lens member, the lens member includes a frame mounted on the buckling member and a window piece mounted on the frame, the window The piece is arranged parallel to the end surface of the second cylindrical section of the quartz end cap;

The frame is made of Kovar alloy gold-plated, and the window is made of high-purity quartz material plated with high permeability film;

The lens frame and the window piece are metallized and then welded into the lens piece through gold-tin welding, or the lens frame and the window piece are welded into the lens piece through lead-free low-temperature glass.
The laser output head according to claim 3, wherein:

The end of the water-cooled part away from the quartz end cap is provided with a stepped round table, the end of the housing is closed by the round table, and the bottom of the round table is provided with a slot extending axially into the water-cooled part. A light-blocking fixing member is inserted and fixed in the slot, and the energy-transmitting optical fiber passes through the light-blocking fixing member and the water-cooling member in sequence and is coaxially welded to the first cylindrical section of the quartz end cap;

The light blocking fixing member is made of gold-plated Kovar alloy, and one end of the light blocking fixing member inserted into the water cooling member is convexly formed with an arc surface.
The laser output head according to claim 10, characterized in that:

A waterproof rubber ring is provided between the casing and the round table;

A waterproof rubber ring is provided between the light blocking fixing member and the round table;

A waterproof rubber ring is arranged between the outer shell and the front end of the water-cooling part.
The laser output head according to claim 10, characterized in that:

A section of the energy transmission fiber adjacent to the quartz end cap is formed with a first gradient stripping mode, and a section of the energy transmission fiber located in the light blocking fixture is formed with a second gradient stripping mode, the first gradient The stripping die and the second gradient stripping die are formed by etching, etching time, length, depth, and separation distance;

Photoelectric sensors for monitoring the intensity of stripping light and the intensity of returning light are provided at the positions of the first gradient stripping and the second gradient stripping;

At least a temperature sensor for monitoring temperature and a temperature control switch for controlling on and off power according to the temperature are provided on the light blocking fixture.
The laser output head according to claim 1, wherein:

An optical fiber protection assembly is provided at the tail of the laser output head, and the optical fiber protection assembly includes an armor cable covering the energy-transmitting optical fiber located on the outside of the housing, a first armor cable fixing sleeve that fixes one end of the armor cable, and fixing A second armor cable fixing sleeve at the other end of the armor cable and a spring sleeved on the armor cable between the first armor cable fixing sleeve and the second armor cable fixing sleeve, the second armor cable is fixed The sleeve is fixed on the casing.
The laser output head according to claim 1, wherein:

The water-cooled part is a water-cooled part made of a high-conductivity material through black body treatment;

The housing is provided with a water inlet connector connected to the water inlet interface and a water outlet connector connected to the water outlet interface.
A laser, characterized by comprising the laser output head according to any one of claims 1 to 14.