CN113224623A

CN113224623A - Laser output head capable of guiding in long distance

Info

Publication number: CN113224623A
Application number: CN202110513095.7A
Authority: CN
Inventors: 金东臣; 刘殿生; 陈晓华
Original assignee: Jiangsu Kaiprin Photoelectric Technology Co ltd
Current assignee: Jiangsu Kaiprin Photoelectric Technology Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-08-06

Abstract

The invention relates to the technical field of laser equipment, in particular to a laser output head capable of conducting long-distance guidance. The optical fiber transmission device comprises a crystal end cap, a main body, a transmission optical fiber bundle, a supporting part and an armor cable, wherein an optical fiber accommodating cavity is formed in the main body along the axial direction; the front end and the crystal end cap of main part are connected, and the rear end is connected with the supporting part, and the armour cable is connected with the supporting part, and transmission optical fiber bundle holding is in the optic fibre holding intracavity of main part, and transmission optical fiber bundle's one end is connected with the crystal end cap, and the other end gets into in the armour cable behind passing the supporting part. The invention realizes multiple functions of laser beam combination and laser transmission, can reduce loss, reduce beam quality deterioration caused by mode influence, and realize multi-beam laser, high power and high beam quality combination.

Description

Laser output head capable of guiding in long distance

Technical Field

The invention relates to the technical field of laser equipment, in particular to a laser output head capable of conducting long-distance guidance.

Background

The output wavelength of the fiber laser covers the visible light to the infrared band, the infrared band is commonly used in the industrial market at present, but the laser wavelength of the band is not visible to the human eye. In practical applications, an additional visible light guide is required, and a red light source is generally used as an indicating light source. At present, a common mode for increasing visible light indication is to use a side coupling or end coupling mode to realize beam combination of guiding light and laser, but the problems of weak indicating light, long-time aging attenuation and short transmission distance exist, and meanwhile, when the visible light indication is increased, extra devices are needed to realize guiding light coupling, so that the problems of low coupling efficiency, system complexity increase and the like exist. In addition, the system which can simultaneously satisfy all the functions is huge, the heat dissipation problem needs to be solved, and the mode of simply increasing the water cooling heat dissipation is not beneficial to remote transmission, especially outdoor operation.

The problem that the high power laser beam combining can have the splice point to generate heat needs to increase the water-cooling heat dissipation that the prior art scheme directly adopts optic fibre to close to restraint and the butt cap butt fusion to realize that the high power laser beam combining can exist, and this mode closes a beam solution for the laser simultaneously, can't solve the problem that visible light guides, can't be directly towards terminal application, still need additionally to increase visible light instruction and cooling device, especially can't solve long distance, long-time reliability work problem. The problem of red light can be solved by adopting an optical fiber beam combiner, but the beam combiner is additionally arranged by adopting the scheme, so that the problems of low coupling efficiency and weak red light generally exist, and the red light is seriously attenuated after the long-time working; the problems that high-power beam combination can be realized by adopting a signal beam combination mode, a signal beam combiner is required to be used, the brightness of the beam combiner is sacrificed, water-cooling heat dissipation is required, the complexity of a system is increased and the like are solved, and a water pipe is easy to bend and twist to influence the appearance, and is more disordered particularly in long-distance transmission; the long-distance transmission generally adds an optical lens system to realize collimation and focusing on the basis of the traditional laser head, generally, the collimation and focusing system at least needs 2-3 groups of lenses, the focal length is fixed, direct adjustment cannot be realized, and the complexity of the system is also seriously increased.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a laser output head capable of guiding over a long distance, so as to solve the problem that the conventional laser head cannot reliably work over a long distance and for a long time.

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

a laser output head capable of conducting long-distance guidance comprises a crystal end cap, a main body, a transmission optical fiber bundle, a supporting part and an armor cable, wherein an optical fiber accommodating cavity is formed in the main body along the axial direction; the front end and the crystal end cap of main part are connected, and the rear end is connected with the supporting part, and the armour cable is connected with the supporting part, and transmission optical fiber bundle holding is in the optic fibre holding intracavity of main part, and transmission optical fiber bundle's one end is connected with the crystal end cap, and the other end gets into in the armour cable behind passing the supporting part.

In a possible implementation manner, the transmission fiber bundle is composed of a plurality of optical fibers, wherein one optical fiber is arranged at the center and is used for transmitting laser; the remaining fibers are distributed around for transmitting red light.

In one possible implementation, the bundle of transmission fibers consists of seven optical fibers.

In one possible implementation mode, the rear end of the main body is connected with two water nozzles; the two water nozzles are respectively connected with the two water pipes, and the two water pipes penetrate through the supporting parts and then enter the armor cables.

In a possible implementation manner, the main body comprises an inner water pipe and a water nozzle fixing piece, wherein the center of the inner water pipe is the optical fiber accommodating cavity, and a sandwich cavity is arranged in the side wall of the inner water pipe and used for injecting a cooling medium; the water nozzle fixing piece is arranged on the outer side of the inner water pipe; the rear end of the water nozzle fixing piece is connected with two water nozzles which are communicated with the interlayer cavity; the two water nozzles are respectively connected with the two water pipes, and the two water pipes penetrate through the supporting parts and then enter the armor cables.

In a possible implementation manner, a mechanical small hole which contracts along the radial direction is arranged in the optical fiber accommodating cavity of the main body; the front end of the main body is provided with a groove communicated with the optical fiber accommodating cavity, and the crystal end cap is embedded in the groove.

In a possible implementation manner, a sleeve is arranged outside the supporting portion, and two ends of the sleeve are respectively connected with the main body and the armor cable.

In one possible implementation, the support part includes an inner support member and an armor fixing member, wherein one end of the inner support member is connected to the rear end of the main body, the other end is connected to the armor fixing member, and the armor is connected to the armor fixing member.

In a possible implementation manner, the supporting portion further includes a plurality of supporting columns, the plurality of supporting columns are circumferentially distributed on the outer side of the internal supporting member, and two ends of each supporting column are respectively connected to the main body and the armor fixing member.

In a possible implementation manner, the armor cable fixing piece is of a stepped shaft structure, and a transmission optical fiber bundle inlet and outlet hole is formed in the center of the armor cable fixing piece along the axial direction; the large-diameter end of the armor cable fixing piece is provided with two water pipe inlet and outlet holes and a plurality of support pillar fixing holes; and a plurality of guide grooves are axially formed in the outer circumference of the small-diameter end of the armor fixing piece.

In a possible implementation mode, the outer side of the main body is alternately sleeved with an insulating ring and an electrode ring at intervals, and the insulating ring and the electrode ring are fixed through a clamping piece in threaded connection with the main body.

The invention has the advantages and beneficial effects that: according to the laser output head capable of being guided in a long distance, the indicating light power can be obviously improved by adding a visible light indicating mode, an additional complex device does not need to be introduced, and the visible light coupling efficiency is improved; meanwhile, hidden water cooling is adopted, so that water cooling and optical fiber transmission are integrated, and the device is suitable for long-distance transmission and long-time stable work; the adjustable lens is added to adjust the output light beam, so that the aim of accurate positioning is fulfilled.

The laser output head capable of being guided in a long distance provided by the embodiment of the invention realizes multiple functions of laser beam combination and laser transmission and the like, overcomes the defects of low success rate, poor stability, poor light beam quality of transmission power contract, high cost and the like, can reduce loss, reduces light beam quality deterioration caused by mode influence, and realizes the combination of multiple lasers, high power and high light beam quality.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a laser output head capable of long-distance guidance according to an embodiment of the present invention;

FIG. 2 is a second schematic structural diagram of a laser output head capable of long-distance guidance according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a main body according to an embodiment of the present invention;

figure 4 is a schematic diagram of an armor mount according to an embodiment of the present invention.

In the figure: 101 is the crystal end cap, 102 is the main part, 1021 is interior water pipe, 1022 is water injection well choke mounting I, 1023 is water injection well choke mounting II, 1024 is mechanical aperture, 1025 is welding point I, 1026 is welding point II, 1027 is the recess, 103 is the fastener, 1041 is electrode ring I, 1042 is electrode ring II, 1051 is insulating ring I, 1052 is insulating ring II, 1053 is insulating ring III, 106 is the water injection well choke, 107 is the water pipe, 108 is internal support piece, 109 is the sleeve, 110 is the transmission optical fiber bundle, 111 is the armour cable mounting, 1111 is the support column fixed orifices, 1112 is water pipe business turn over hole, 1113 is transmission optical fiber bundle business turn over hole, 1114 is the guide way, 112 is the armour cable, 113 is the support column.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

The laser output head capable of long-distance guidance provided by the embodiment of the invention realizes a mode of multi-path indicating light and single-path laser, realizes the purpose of power increase by indicating the light combination, can be used for long-distance transmission, and is matched with an adjustable lens to further ensure long-distance transmission application and position and focus. Referring to fig. 1 to 2, the laser output head capable of long-distance guidance includes a crystal end cap 101, a main body 102, a transmission fiber bundle 110, a support part and an armor cable 112, wherein a fiber accommodating cavity is axially arranged in the main body 102; the front end of the main body 102 is connected with the crystal end cap 101, the rear end of the main body 102 is connected with the support portion, the armor cable 112 is connected with the support portion, the transmission optical fiber bundle 110 is accommodated in the optical fiber accommodating cavity of the main body 102, one end of the transmission optical fiber bundle 110 is connected with the crystal end cap 101, and the other end of the transmission optical fiber bundle penetrates through the support portion and then enters the armor cable 112.

In the embodiment of the present invention, the transmission fiber bundle 110 is composed of a plurality of fibers, wherein one fiber is disposed at the center for transmitting laser; the remaining fibers are distributed around for transmitting red light. Specifically, in the present embodiment, the transmission fiber bundle 110 is composed of seven optical fibers, wherein the central optical fiber transmits laser light; the other six optical fibers are distributed around the optical fiber positioned in the center and used for transmitting red light, and the seven optical fibers are combined into one optical fiber through a fused biconical taper technology. The crystal end cap 101 and the transmission optical fiber bundle 110 are welded into a whole by using a welding machine, a visible light increasing mode is realized by combining multiple paths of indicating light and a single path of laser light, and the purpose of increasing the indicating light power is realized by combining multiple paths of indicating light.

Further, a mechanical small hole 1024 which is contracted along the radial direction is arranged in the optical fiber accommodating cavity of the main body 102, and the diameter of the mechanical small hole 1024 is larger than the outer diameter of the transmission optical fiber bundle 110, and is generally 0.6-1mm, so that the transmission optical fiber bundle 110 can pass through the mechanical small hole; the front end of the main body 102 is provided with a groove 1027 communicated with the optical fiber accommodating cavity, and the crystal end cap 101 is embedded in the groove 1027; the rear end of the main body 102 is provided with a connection portion connected with the support portion. In this embodiment, the crystal end cap 101 is made of a quartz crystal, and the front end surface of the quartz crystal is an adjustable lens, which achieves the purposes of long-distance positioning and laser focusing through focal length adjustment. Specifically, the crystal end cap 101 is a convex lens end cap, the focal length is adjusted by changing the curvature radius of the convex lens, and the material of the convex lens end cap may be high-purity fused quartz, calcium fluoride, sapphire, calcium fluoride, magnesium fluoride or zinc selenide. The welding of the convex lens end cap to the transmission fiber bundle 110 is achieved by heating using oxyhydrogen flame, graphite wire, electrodes or laser discharge.

Further, in the embodiment of the present invention, two water nozzles 106 are connected to two sides of the rear end of the main body 102; the two water nozzles 106 are respectively connected with two water pipes 107, and the two water pipes 107 penetrate through the supporting part and then enter the armor cable 112.

As shown in fig. 3, in the embodiment of the present invention, the main body 102 includes an inner water pipe 1021 and a water nozzle fixing member, wherein the center of the inner water pipe 1021 is an optical fiber accommodating cavity, and a sandwich cavity is disposed in a sidewall of the inner water pipe 1021 for injecting a cooling medium, i.e., cooling circulating water; the water nozzle fixing piece is arranged on the outer side of the inner water pipe 1021 and used for installing two water nozzles 106, and the water nozzles 106 are communicated with an interlayer cavity of the inner water pipe 1021.

In order to facilitate processing and assembling, the water nozzle fixing piece is of a splicing structure. Specifically, water injection well choke mounting includes water injection well choke mounting I1022 and II 1023 of water injection well choke mounting, and water injection well choke mounting I1022 and II 1023 of water injection well choke mounting symmetry set up in the outside of interior water pipe 1021, and the front and back end is respectively through welding point I1025 and welding point II 1026 and interior water pipe 1021 welding, realizes an integrative structure. The water nozzle fixing piece I1022 and the water nozzle fixing piece II 1023 are both provided with water nozzle mounting holes, and the two water nozzles 106 are respectively mounted in the water nozzle mounting holes in the water nozzle fixing piece I1022 and the water nozzle fixing piece II 1023. The water nozzle 106 supplies cooling water to the inner water pipe 1021, so that the heat exchange rate is greatly improved, and the cooling effect is improved.

Further, a sleeve 109 is arranged on the outer side of the support part, the front end of the sleeve 109 is in threaded connection with the main body 102, and the rear end of the sleeve 109 is fixedly connected with the armor cable 112 through a bolt additionally arranged at a tail fixing hole. The sleeve 109 serves as a connection and at the same time protects the support and the water pipe 107.

As shown in fig. 1 to 2, in the embodiment of the present invention, the supporting part includes an inner support 108 and a cable holder 111, wherein one end of the inner support 108 is connected to the rear end of the inner water pipe 1021, the other end is connected to the cable holder 111, and the cable 112 is connected to the cable holder 111.

Specifically, the inner support 108 is a hollow stepped shaft structure, and one end of the inner support is in threaded connection with a connecting part at the rear end of the inner water pipe 1021 and is coaxial with the main body 102; the other end of the inner support 108 is plugged into the armor mount 111.

As shown in fig. 2, in the embodiment of the present invention, the supporting portion further includes a plurality of supporting columns 113, the supporting columns 113 are circumferentially distributed on the outer side of the internal supporting member 108, and two ends of each supporting column 113 are respectively connected to the water nozzle fixing member and the cable fixing member 111 through screws. Specifically, the number of the support columns 113 is three, and copper columns are employed.

As shown in fig. 4, in the embodiment of the present invention, the armor fixing member 111 has a stepped shaft structure, and a transmission fiber bundle access hole 1113 is axially formed in the center thereof; the large-diameter end of the armor fixing piece 111 is provided with two water pipe inlet and outlet holes 1112 and a plurality of support pillar fixing holes 1111; the outer circumference of the small-diameter end of the armor fixing member 111 is provided with a plurality of guide grooves 1114 in the axial direction. In this embodiment, the large-diameter end of the cable fixing member 111 is provided with three support post fixing holes 1111, and five guide grooves 1114 are axially formed on the outer circumference of the small-diameter end of the cable fixing member 111. The transmission optical fiber bundle 110 enters the armor 112 through the transmission optical fiber bundle inlet and outlet hole 1113, and the two water pipes 107 pass through the water pipe inlet and outlet hole 1112 and the three support posts 113 respectively pass through the three support post fixing holes 1111 and then respectively enter the armor 112 through the corresponding guide grooves 1114. The other end of the inner support member 108 is inserted into the transmission fiber bundle inlet and outlet hole 1113, and then fixed and locked by installing a screw.

As shown in fig. 1 and 2, in the above embodiment, a plurality of electrode rings and a plurality of insulating rings alternately arranged at intervals are sleeved outside the main body 102, and the electrode rings and the insulating rings are axially limited and tightly assembled by the clamping piece 103 screwed with the main body 102.

In the embodiment, the electrode ring comprises an electrode ring I1041 and an electrode ring II 1042, the insulating ring comprises an insulating ring I1051, an insulating ring II 1052 and an insulating ring III 1053, and the electrode ring and the insulating ring are sequentially arranged on the main body 102 at intervals by using curing glue; the installation positions are as follows: the insulation ring II 1052 is arranged between the electrode ring I1041 and the electrode ring II 1042, and the insulation ring I1051 and the insulation ring III 1053 are respectively arranged on the outer sides of the electrode ring I1041 and the electrode ring II 1042. The inner parts of the electrode rings are respectively and correspondingly connected with leads which are connected to an external circuit board; when the QBH is inserted into the laser processing head, the electrode ring and the laser processing head are respectively contacted to form a passage which can be normally used; when the QBH is inserted inside the laser machining head, the electrode ring is in contact with the laser machining head but does not form a passage, and the laser machining head will alarm. The electrode ring is a safety measure for judging the conduction.

In the embodiment of the invention, the main body 102 adopts a hidden water-cooling structure, realizes the integration of water cooling and optical fiber transmission, is suitable for long-distance transmission and works stably for a long time; for low-power laser application, the internal circulation of a water channel can be directly realized, and the longer the transmission distance is, the better the convection and heat dissipation effects of the water channel through air are; for high-power laser application, the laser output head can share a water path for circulation with a laser, the water cooling design cannot be observed through the appearance, and the laser output head is simple and compact as a whole.

In the embodiment of the present invention, the transmission fiber bundle 110 is implemented by tightly arranging a plurality of optical fibers, twisting and knotting a plurality of optical fibers, or melting and tapering a tube, and the transmission fiber bundle 110 may be a single mode fiber or a multimode fiber; or solid optical fiber or hollow optical fiber; or may be passive or active.

The laser output head capable of long-distance guidance provided by the embodiment of the invention is a mode of realizing multi-path indicating light and single-path laser, realizes the purpose of increasing power by indicating the light combination, can be used for long-distance transmission, and is matched with an adjustable lens to further ensure long-distance transmission application and position and focus. The invention can reduce loss, reduce beam quality deterioration caused by mode influence, and realize multi-beam laser, high power and high beam quality synthesis.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A laser output head capable of being guided in a long distance is characterized by comprising a crystal end cap (101), a main body (102), a transmission optical fiber bundle (110), a supporting part and an armor cable (112), wherein an optical fiber accommodating cavity is axially arranged in the main body (102); the front end of the main body (102) is connected with the crystal end cap (101), the rear end of the main body is connected with the supporting part, the armor cable (112) is connected with the supporting part, the transmission optical fiber bundle (110) is contained in the optical fiber containing cavity of the main body (102), one end of the transmission optical fiber bundle (110) is connected with the crystal end cap (101), and the other end of the transmission optical fiber bundle penetrates through the supporting part and then enters the armor cable (112).

2. The long-distance guidable laser output head according to claim 1, wherein said transmission fiber bundle (110) is composed of a plurality of optical fibers, one of which is centrally arranged for transmitting laser light; the remaining fibers are distributed around for transmitting red light.

3. The long-distance guidable laser output head according to claim 2, wherein said transmission fiber bundle (110) consists of seven optical fibers.

4. The long-distance guidable laser output head as set forth in claim 1, wherein said main body (102) comprises an inner water pipe (1021) and a water nozzle fixing member, wherein the center of the inner water pipe (1021) is said optical fiber accommodating chamber, and a sandwich chamber is provided in the side wall of the inner water pipe (1021); the water nozzle fixing piece is arranged on the outer side of the inner water pipe (1021), the rear end of the water nozzle fixing piece is connected with two water nozzles (106), and the two water nozzles (106) are communicated with the interlayer cavity; the two water nozzles (106) are respectively connected with two water pipes (107), and the two water pipes (107) penetrate through the supporting parts and then enter the armor cable (112).

5. The long-distance guidable laser output head as set forth in claim 1, wherein said body (102) has a mechanical eyelet (1024) radially constricted in the fiber receiving chamber; the front end of the main body (102) is provided with a groove (1027) communicated with the optical fiber accommodating cavity, and the crystal end cap (101) is embedded in the groove (1027).

6. Long distance guidable laser output head according to claim 1, wherein a sleeve (109) is provided on the outside of the support, the sleeve (109) being connected at both ends to the body (102) and to the sheath (112), respectively.

7. Long distance guidable laser output head according to claim 1, wherein the support comprises an inner support (108) and a cable fixing (111), wherein the inner support (108) is connected with one end to the rear end of the main body (102) and with the other end to the cable fixing (111), and wherein the cable (112) is connected to the cable fixing (111).

8. The long-distance guidable laser output head as set forth in claim 7, wherein said support further comprises a plurality of support columns (113), said plurality of support columns (113) being circumferentially distributed on the outside of said inner support (108), both ends of each support column (113) being connected to said main body (102) and said cable retainer (111), respectively.

9. The long-distance guidable laser output head as set forth in claim 8, wherein said sheath holder (111) is of a stepped shaft structure having a transmission fiber bundle access hole (1113) formed at the center thereof in the axial direction; the large-diameter end of the armor fixing piece (111) is provided with two water pipe inlet and outlet holes (1112) and a plurality of support pillar fixing holes (1111); the outer circumference of the small-diameter end of the armor fixing piece (111) is provided with a plurality of guide grooves (1114) along the axial direction.

10. The long-distance guidable laser output head according to claim 1, wherein the outer side of the main body (102) is alternately sleeved with an insulating ring and an electrode ring at intervals, and the insulating ring and the electrode ring are fixed by a clamping piece (103) in threaded connection with the main body (102).