Multiband laser beam expander

Abstract

The invention relates to the technical field of beam expanding lenses, in particular to a multiband laser beam expanding lens which comprises a lens barrel, a flow guide mechanism, a diameter changing mechanism, an air blowing mechanism, a flow dividing mechanism and a water injection mechanism. Cooling water is injected into the lens barrel through the water inlet, the guide wheel is pushed to rotate through water flow in the flow guide groove, so that the fan is driven to blow and cool the surface of the lens, and the overall cooling effect can be greatly improved through the double cooling effect of air cooling of the water cooling machine; a pressure block slides to drive a top block to slide along a connecting groove, two stopping blocks are forced to seal the diameter of an opening of a connecting channel, water flow flowing through a flow guide groove is forced to be accelerated, the rotating speed of a fan is forced to be accelerated, and the circulation effect of air flow is improved; the baffle is forced to rotate from a vertical state to a horizontal state in the flow dividing pipe, cooling water is forced to enter the water injection groove through the flow dividing pipe and flow out of the connecting cavity, and the cooling effect of air blowing of the fan can be further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of beam expanders, and in particular to a multi-band laser beam expander. Background Art

[0002] A laser beam expander is a lens component that can change the diameter and divergence angle of a laser beam. By using a laser beam expander, the collimation of the laser can be improved, thus playing an important role in long-distance lighting, projection and focusing systems. Due to its focusing effect on the light beam, laser beam expanders are widely used in equipment such as laser marking machines.

[0003] During the long-term use of the laser marking machine, a large amount of energy will be generated inside the lens barrel due to the continuous passage of the laser through the lens group, causing the internal temperature of the lens barrel to continue to rise, which may cause some parts of the optical path to overheat and burn the optical path. The lens will also change the lattice state due to the increase in temperature and be affected by thermal expansion, causing the quality of the light to deteriorate and produce large errors. In order to improve the heat dissipation efficiency during long-term use, some water-cooled beam expanders are also widely used. However, cooling by water alone can only cool the heat generated inside the lens barrel. The lens is in direct contact with the light, and its surface will also generate a lot of heat. The cooling effect of cooling only the hollow part inside the lens barrel has relatively little effect on the lens surface, but may produce a large temperature difference effect. The beam expander body may have mechanical failure due to pressure imbalance, affecting the stability of normal operation. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a multi-band laser beam expander.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-band laser beam expander, comprising a lens barrel, wherein two ends of the lens barrel are respectively provided with a concave mirror and a convex mirror, one end of the lens barrel is fixedly connected with a quick-connect plug, and the quick-connect plug is located at the end close to the concave mirror, a water inlet is fixedly connected to the middle of the top of the lens barrel, and two water outlets are symmetrically fixedly connected to the two sides of the bottom of the lens barrel, and further comprising;

[0007] A flow guiding mechanism, which is arranged inside the lens barrel and is used to guide and cool the cooling water entering through the clean water inlet;

[0008] A diameter-changing mechanism, which is arranged inside the lens barrel and is used to adaptively adjust the aperture of the flow-guiding mechanism;

[0009] The air blowing mechanism is rotatably connected to the two ends of the lens barrel, and the two air blowing mechanisms are respectively located on the opposite sides of the concave mirror and the convex mirror, and the two air blowing mechanisms are respectively used to blow air to cool the surfaces of the concave mirror and the convex mirror;

[0010] A flow diversion mechanism, the flow diversion mechanism is arranged inside the lens barrel, and the flow diversion mechanism is used to divert the cooling water flowing through the inside of the flow guide mechanism;

[0011] And a water injection mechanism, which is arranged inside the hair dryer mechanism, and injects cooling water that enters the diversion mechanism into the hair dryer mechanism through the intercom.

[0012] In the above-mentioned multi-band laser beam expander, the guide mechanism includes a guide cavity, a connecting channel and a guide groove. The guide cavity, the connecting channel and the guide groove are all opened inside the lens barrel. The top of the guide cavity is connected to the bottom of the water inlet. Several connecting channels are symmetrically connected to the two sides of the guide cavity. The guide groove is connected to one end of the connecting channel away from the guide cavity. Annular grooves are symmetrically opened at both ends of the lens barrel. The two ends of the guide groove away from the connecting channel are respectively connected to two annular grooves, and the bottom of the annular groove is connected to the water outlet.

[0013] In the above-mentioned multi-band laser beam expander, the variable diameter mechanism includes a pressure block, two top blocks and two blocking blocks. A plurality of connecting grooves are symmetrically opened inside the lens barrel and on both sides of the guide cavity. The pressure block is slidably connected to the inside of the connecting groove. The two top bars are symmetrically hinged to the two sides of the pressure block. The other ends of the two top blocks are respectively hinged to the two blocking blocks. The two blocking blocks located inside the same guide groove are symmetrically slidably connected to the two sides inside the guide groove. An elastic rope is fixedly connected to one side of the blocking block located outside the guide groove, and the other end of the elastic rope is fixedly connected to the inside of the connecting groove.

[0014] In the above-mentioned multi-band laser beam expander, the blower mechanism includes a fan and a guide wheel, the guide wheel is fixedly connected to the top of the fan, a rotating groove is opened inside the lens barrel, the guide wheel is rotatably connected to the inside of the rotating groove, two grooves are symmetrically opened at the top of the two ends of the inner wall of the lens barrel, the fan is rotatably connected to the inside of the groove, and one side of the rotating groove is connected to one side of one of the guide grooves.

[0015] In the above-mentioned multi-band laser beam expander, the diversion mechanism includes a diversion tube, a baffle and a connecting wheel. The diversion tube is fixedly connected to the inside of the lens barrel, and one end of the diversion tube is connected to one side of the guide groove, and the other end of the diversion tube is rotatably connected to the top of the guide wheel, the baffle is rotatably connected to the inside of the diversion tube, the connecting wheel is fixedly connected to one side of the baffle, and the connecting wheel is rotatably connected to the inside of the lens barrel, one side of the surface of the connecting wheel is meshed with a rack, the bottom of the rack is fixedly connected to a guide rod, the other end of the guide rod is fixedly connected to one of the pressure blocks, and the guide rod and the rack are both slidably connected to the inside of the lens barrel.

[0016] In the above-mentioned multi-band laser beam expander, the water injection mechanism includes a water injection groove, a plurality of curved grooves and a connecting cavity. The water injection groove is opened inside the fan, and the top of the water injection groove is connected to the end of the shunt pipe away from the baffle, the plurality of curved grooves are evenly connected to the inside of the water injection groove, the plurality of curved grooves are opened inside the fan, the ends of the plurality of curved grooves away from the water injection groove are connected to the connecting cavity, and the connecting cavity is located below the water injection groove, the bottom of the fan is rotatably connected to a conduit, the other end of the conduit is connected to the annular groove, and the top end of the conduit is connected to the bottom of the connecting cavity.

[0017] In the above-mentioned multi-band laser beam expander, a plurality of connecting tubes are evenly arranged inside the lens barrel, two ends of the connecting tubes are respectively connected to two adjacent guide grooves, and the guide rods are slidably connected to the bottom of the connecting tubes.

[0018] In the above-mentioned multi-band laser beam expander, four air inlets are symmetrically provided on the surface of the lens barrel and located on both sides of the water inlet, and two air outlets are symmetrically provided on the surface of the lens barrel and located between the two water outlets, and both the air inlet and the air outlet are connected to the interior of the lens barrel.

[0019] Compared with existing technologies, the advantages of this multi-band laser beam expander are:

[0020] 1. Inject cooling water into the lens barrel through the water inlet, and drive the guide wheel to rotate through the water flow in the guide groove, thereby driving the fan to blow air to cool the surface of the lens. The dual cooling effect of water cooler and air cooling can greatly improve the overall cooling effect;

[0021] 2. The sliding of the pressure block drives the top block to slide along the connecting groove, and pushes the two blocking blocks located inside the same guide groove to move closer to each other, so as to close the opening diameter of the connecting channel, reduce the aperture, and force the water flow through the guide groove to accelerate, forcing the fan to speed up, thereby improving the circulation effect of the airflow and thus improving the cooling effect;

[0022] 3. The pressure block drives the rack to slide through the guide rod, forcing the baffle to rotate from a vertical state to a horizontal state in the shunt pipe, forcing the cooling water to enter the water injection tank through the shunt pipe and flow out through the curved groove and the connecting cavity, which can cool the fan and further ensure the cooling effect of the fan blowing;

[0023] To sum up, the present invention injects cooling water into the interior of the lens barrel through the water inlet, and drives the guide wheel to rotate through the passage of water in the guide groove, thereby driving the fan to blow air to cool the surface of the lens. The dual cooling effect of water-cooling and air-cooling can greatly improve the overall cooling effect. The sliding of the pressure block drives the top block to slide along the connecting groove, forcing the two blocking blocks to close the opening diameter of the connecting channel, forcing the water flow through the guide groove to accelerate, forcing the fan to speed up, and improving the circulation effect of the airflow. The guide rod drives the rack to slide, forcing the baffle to rotate from a vertical state to a horizontal state in the shunt pipe, forcing the cooling water to enter the water injection groove through the shunt pipe and flow out through the curved groove and the connecting cavity, which can cool the fan and further ensure the cooling effect of the fan blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 is a schematic diagram of the fan connection structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the flow guide cavity of the present invention;

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of the water inlet of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the connecting pipe of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the connection groove of the present invention;

[0030] Figure 7 It is a schematic diagram of the cross-sectional structure of the rotating groove of the present invention;

[0031] Figure 8 It is a schematic diagram of the cross-sectional structure of the guide groove of the present invention;

[0032] Fig. 9 The present invention Figure 8 A schematic diagram of the partially enlarged structure at center A;

[0033] Fig.10 It is a schematic diagram of the cross-sectional structure of the water injection tank of the present invention;

[0034] Fig.11 It is a schematic diagram of the cross-sectional structure of the fan of the present invention.

[0035] In the figure: 1. lens barrel; 2. concave mirror; 3. convex mirror; 4. quick-connect plug; 5. water inlet; 6. water outlet; 7. guide mechanism; 701. guide cavity; 702. connecting channel; 703. guide groove; 8. diameter-changing mechanism; 801. pressure block; 802. top block; 803. blocking block; 9. blower mechanism; 901. fan; 902. guide wheel; 10. diversion mechanism; 101. diversion pipe; 102. baffle; 103. connecting wheel; 11. water injection mechanism; 111. water injection groove; 112. curved groove; 113. connecting cavity; 12. annular groove; 13. connecting groove; 14. elastic rope; 15. rotating groove; 16. groove; 17. rack; 18. guide rod; 19. conduit; 20. connecting pipe; 21. air inlet; 22. air outlet. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Reference Figure 1-Figure 11A multi-band laser beam expander includes a lens barrel 1, wherein a concave mirror 2 and a convex mirror 3 are respectively arranged at two ends inside the lens barrel 1, a quick-connect plug 4 is fixedly connected to one end of the lens barrel 1, and the quick-connect plug 4 is located at the end close to the concave mirror 2, a water inlet 5 is fixedly connected to the middle of the top of the lens barrel 1, and two water outlets 6 are symmetrically fixedly connected to the two sides of the bottom of the lens barrel 1, and a guide mechanism 7 is also included, which is arranged inside the lens barrel 1, and the guide mechanism 7 is used to guide and cool the cooling water entering through the clean water port, and the guide mechanism 7 includes a guide cavity 701, a connecting channel 702 and a guide groove 703, and the guide cavity 701, the connecting channel 702 and the guide groove 703 are all arranged inside the lens barrel 1, the top of the guide cavity 701 is connected to the bottom of the water inlet 5, and a plurality of connecting channels 702 are symmetrically connected to the two sides of the guide cavity 701, and the guide groove 703 and the connecting channel 702 are far away from the guide cavity 701. One end of the lens barrel 1 is connected, annular grooves 12 are symmetrically provided at both ends of the interior of the lens barrel 1, the two ends of the guide groove 703 away from the connecting channel 702 are respectively connected to the two annular grooves 12, the bottom of the annular groove 12 is connected to the water outlet 6, a blower mechanism 9, the blower mechanism 9 is rotatably connected to the two ends of the interior of the lens barrel 1, and the two blower mechanisms 9 are respectively located on the side opposite to the concave mirror 2 and the convex mirror 3, the two blower mechanisms 9 are respectively used to blow air to cool the surfaces of the concave mirror 2 and the convex mirror 3, the blower mechanism 9 includes a fan 901 and a guide wheel 902, the guide wheel 902 is fixedly connected to the top of the fan 901, a rotating groove 15 is provided inside the lens barrel 1, the guide wheel 902 is rotatably connected to the inside of the rotating groove 15, two grooves 16 are symmetrically provided on the top of the two ends of the inner wall of the lens barrel 1, the fan 901 is rotatably connected to the inside of the groove 16, and one side of the rotating groove 15 is connected to one side of one of the guide grooves 703.

[0039] Among them, cooling water is injected into the guide cavity 701 through the water inlet 5, and the cooling water will enter the multiple guide grooves 703 through the connecting channels 702 on both sides of the guide cavity 701, and finally enter the annular groove 12 through the guide grooves 703, and the cooling water involved in the cooling work will be discharged through the water outlets 6 on both sides of the bottom of the lens barrel 1, and it will work continuously to achieve cooling work during the operation of the collimator, and in the process of the cooling water flowing into the annular groove 12 through one of the guide grooves 703, the cooling water will push the guide wheel 902 in the rotating groove 15 to rotate, thereby driving the fan 901 to rotate in the groove 16, and through the rotation effect of the fan 901, the air gathered on the lens surface is forced to produce a flow effect, thereby blowing away the high-temperature gas gathered on the lens surface, thereby achieving the working effect of cooling the lens surface, and ensuring the stability of the overall operation of the collimator.

[0040] The reducing mechanism 8 is arranged inside the lens barrel 1. The reducing mechanism 8 is used to adaptively adjust the aperture of the guide mechanism 7. The reducing mechanism 8 includes a pressure block 801, two top blocks 802 and two blocking blocks 803. A plurality of connecting grooves 13 are symmetrically provided inside the lens barrel 1 and on both sides of the guide cavity 701. The pressure block 801 is slidably connected to the inside of the connecting groove 13. Two top bars are symmetrically hinged on both sides of the pressure block 801. The other ends of the two top blocks 802 are respectively hinged to the two blocking blocks 803. The two blocking blocks 803 located inside the same guide groove 703 are symmetrically slidably connected to the two sides inside the guide groove 703. One side of the blocking block 803 located outside the guide groove 703 is fixedly connected with an elastic rope 14. The other end of the elastic rope 14 is fixedly connected to the inside of the connecting groove 13. A plurality of connecting pipes 20 are evenly provided inside the lens barrel 1. The two ends of the connecting pipe 20 are respectively connected to the two adjacent guide grooves 703. The guide rod 18 is slidably connected to the bottom of the connecting pipe 20.

[0041] When the cooling effect of flowing cooling water is not enough to achieve a good cooling effect, the air inside the lens barrel 1 will expand due to the heat, thereby pushing the pressure block 801 to slide along the connecting groove 13, and the two top blocks 802 on both sides thereof can push the two blocking blocks 803 to slide toward the inside of the guide groove 703, forcing the two blocking blocks 803 located in the same guide groove 703 to slide close to each other, thereby producing a sealing effect on the aperture at which the connecting channel 702 and the guide groove 703 are connected to each other, and while the aperture is reduced, the flow rate of the cooling water flowing through the guide groove 703 is accelerated, so that cooling can be completed faster, and the faster circulation speed will force the fan 901 to increase its speed by driving the rotation of the guide wheel 902, thereby accelerating the air circulation effect and further improving the overall cooling effect.

[0042] The shunt mechanism 10 is arranged inside the lens barrel 1. The shunt mechanism 10 is used to shunt the cooling water flowing through the guide mechanism 7. The shunt mechanism 10 includes a shunt pipe 101, a baffle 102 and a connecting wheel 103. The shunt pipe 101 is fixedly connected to the inside of the lens barrel 1, and one end of the shunt pipe 101 is communicated with one side of the guide groove 703, and the other end of the shunt pipe 101 is rotatably connected to the top of the guide wheel 902. The baffle 102 is rotatably connected to the inside of the shunt pipe 101. The connecting wheel 103 is fixedly connected to one side of the baffle 102, and the connecting wheel 103 is rotatably connected to the inside of the lens barrel 1. A rack 17 is meshed on one side of the surface of the connecting wheel 103, and a guide rod 18 is fixedly connected to the bottom of the rack 17. The other end of the guide rod 18 is fixedly connected to one of the pressure blocks 801, and the guide rod 18 and the rack 17 are both slidably connected to the inside of the lens barrel 1. The water injection mechanism 11 is arranged inside the hair blowing mechanism 9. The water injection mechanism 11 injects the cooling water entering the diversion mechanism 10 into the inside of the hair blowing mechanism 9. The water injection mechanism 11 includes a water injection groove 111, a plurality of curved grooves 112 and a connecting cavity 113. The water injection groove 111 is opened inside the fan 901, and the top of the water injection groove 111 is connected to the end of the diversion pipe 101 away from the baffle 102. The plurality of curved grooves 112 are evenly connected to the inside of the water injection groove 111. The plurality of curved grooves 112 are opened inside the fan 901. The ends of the plurality of curved grooves 112 away from the water injection groove 111 are connected to the connecting cavity 113, and the connecting cavity 113 is located below the water injection groove 111. The bottom of the fan 901 is rotatably connected to a conduit 19. The other end of the conduit 19 is connected to the annular groove 12, and the top of the conduit 19 is connected to the bottom of the connecting cavity 113.

[0043] Among them, through the sliding of the pressure block 801, the rack 17 can be driven to slide through the guide rod 18, and the sliding of the rack 17 will drive the connecting wheel 103 to rotate, forcing the baffle 102 to rotate from a vertical state to a horizontal state inside the shunt pipe 101. At this time, a part of the cooling water in the guide groove 703 will flow into the shunt pipe 101, and flow into the water injection groove 111 through the shunt pipe 101, and flow through the inside of the fan 901 through the curved groove 112 and then flow into the connecting chamber 113. The fan 901 in the rotating state can ensure that the cooling water entering the curved groove 112 can smoothly flow into the connecting chamber 113 through the effects of centrifugal force and natural gravity, thereby achieving the effect of cooling the inside of the fan 901, ensuring that the fan 901 can not only accelerate the air flow when blowing and cooling, but also generate a relatively low temperature airflow, further improving the overall cooling effect, and the cooling water flowing into the connecting chamber 113 finally enters the annular groove 12 through the conduit 19 to be discharged.

[0044] Four air inlets 21 are symmetrically provided on the surface of the lens barrel 1 and located on both sides of the water inlet 5 . Two air outlets 22 are symmetrically provided on the surface of the lens barrel 1 and located between the two water outlets 6 . Both the air inlets 21 and the air outlets 22 are connected to the interior of the lens barrel 1 .

[0045] Among them, the air inlet 21 and the air outlet 22 are connected to the inside of the lens barrel 1 respectively, so that when the fan 901 rotates to drive air circulation, hot air can be discharged from the air outlet 22, and fresh and relatively low temperature air can be sucked in from the outside through the air inlet 21, thereby ensuring the effectiveness of the heat dissipation work.

[0046] The specific working principle and use method of the present invention are explained in detail below: when in use, in the first step, cooling water is injected into the guide cavity 701 through the water inlet 5, and the cooling water will enter the multiple guide grooves 703 through the connecting channels 702 on both sides of the guide cavity 701, and finally enter the annular groove 12 through the guide grooves 703, and the cooling water involved in the cooling work will be discharged through the water outlets 6 on both sides of the bottom of the lens barrel 1, and the cooling work will be continuously performed to achieve the cooling work during the operation of the beam expander, and in the process of the cooling water flowing into the annular groove 12 through one of the guide grooves 703, the cooling water will push the guide wheel 902 in the rotating groove 15 to rotate, thereby driving the fan 901 to rotate in the groove 16, and the air gathered on the lens surface is forced to produce a flow effect through the rotation effect of the fan 901, so as to blow away the high-temperature gas gathered on the lens surface, thereby achieving the working effect of cooling the lens surface;

[0047] In the second step, when the cooling effect of the flowing cooling water is not enough to achieve a good cooling effect, the air inside the lens barrel 1 will expand due to the heat, thereby pushing the pressure block 801 to slide along the connecting groove 13, and the two top blocks 802 on both sides thereof can push the two blocking blocks 803 to slide toward the inside of the guide groove 703, forcing the two blocking blocks 803 located inside the same guide groove 703 to slide close to each other, thereby producing a sealing effect on the aperture at which the connecting channel 702 and the guide groove 703 are connected to each other, and while the aperture is reduced, the flow rate of the cooling water flowing through the guide groove 703 is accelerated, so that the cooling can be completed faster, and the faster circulation speed will force the fan 901 to increase its speed by driving the rotation of the guide wheel 902;

[0048] In the third step, the rack 17 can be driven to slide through the guide rod 18 by the sliding of the pressure block 801, and the sliding of the rack 17 will drive the connecting wheel 103 to rotate, forcing the baffle 102 to rotate from a vertical state to a horizontal state inside the shunt pipe 101. At this time, a part of the cooling water in the guide groove 703 will flow into the shunt pipe 101, and flow into the water injection groove 111 through the shunt pipe 101, and flow through the inside of the fan 901 through the curved groove 112 and then flow into the connecting cavity 113. The fan 901 in the rotating state can ensure that the cooling water entering the curved groove 112 can smoothly flow into the connecting cavity 113 through the effects of centrifugal force and natural gravity, thereby achieving the effect of cooling the inside of the fan 901, ensuring that when the fan 901 blows air for cooling, in addition to the effect of accelerating the air flow, it can also generate a relatively low temperature airflow, thereby further improving the overall cooling effect.

[0049] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-band laser beam expander, characterized in that: The invention comprises a lens barrel (1), wherein two ends of the lens barrel (1) are respectively provided with a concave mirror (2) and a convex mirror (3), one end of the lens barrel (1) is fixedly connected with a quick-connect plug (4), and the quick-connect plug (4) is located at the end close to the concave mirror (2), a water inlet (5) is fixedly connected to the middle of the top of the lens barrel (1), and two water outlets (6) are symmetrically fixedly connected to the two sides of the bottom of the lens barrel (1), and further comprises: A flow guiding mechanism (7), wherein the flow guiding mechanism (7) is arranged inside the lens barrel (1), and the flow guiding mechanism (7) is used to guide and cool down the cooling water entering through the clean water inlet; A diameter-changing mechanism (8), wherein the diameter-changing mechanism (8) is arranged inside the lens barrel (1), and the diameter-changing mechanism (8) is used to adaptively adjust the aperture of the flow-guiding mechanism (7); A blower mechanism (9), the blower mechanism (9) being rotatably connected to two ends of the interior of the lens barrel (1), and the two blower mechanisms (9) being respectively located on opposite sides close to the concave mirror (2) and the convex mirror (3), and the two blower mechanisms (9) are respectively used to blow air to cool the surfaces of the concave mirror (2) and the convex mirror (3); A flow diversion mechanism (10), the flow diversion mechanism (10) being arranged inside the lens barrel (1), and the flow diversion mechanism (10) being used to divert cooling water flowing through the inside of the flow guide mechanism (7); and a water injection mechanism (11), wherein the water injection mechanism (11) is arranged inside the air blowing mechanism (9), and the water injection mechanism (11) injects cooling water entering the diversion mechanism (10) into the interior of the air blowing mechanism (9).

2. The multi-band laser beam expander according to claim 1, characterized in that: The flow guiding mechanism (7) comprises a flow guiding cavity (701), a connecting channel (702) and a flow guiding groove (703); the flow guiding cavity (701), the connecting channel (702) and the flow guiding groove (703) are all arranged inside the lens barrel (1); the top of the flow guiding cavity (701) is connected to the bottom of the water inlet (5); a plurality of connecting channels (702) are symmetrically connected to two sides of the flow guiding cavity (701); the flow guiding groove (703) is connected to one end of the connecting channel (702) away from the flow guiding cavity (701); annular grooves (12) are symmetrically arranged at both ends of the lens barrel (1); the two ends of the flow guiding groove (703) away from the connecting channel (702) are respectively connected to two annular grooves (12); and the bottom of the annular groove (12) is connected to the water outlet (6).

3. The multi-band laser beam expander according to claim 2, characterized in that: The diameter-changing mechanism (8) comprises a pressure block (801), two top blocks (802) and two blocking blocks (803); a plurality of connecting grooves (13) are symmetrically provided inside the lens barrel (1) and located on both sides of the flow guide cavity (701); the pressure block (801) is slidably connected to the inside of the connecting groove (13); two top bars are symmetrically hinged to the two sides of the pressure block (801); the other ends of the two top blocks (802) are respectively hinged to the two blocking blocks (803); the two blocking blocks (803) located inside the same flow guide groove (703) are symmetrically slidably connected to the two sides inside the flow guide groove (703); one side of the blocking block (803) located outside the flow guide groove (703) is fixedly connected to an elastic rope (14); the other end of the elastic rope (14) is fixedly connected to the inside of the connecting groove (13).

4. The multi-band laser beam expander according to claim 2, characterized in that: The blower mechanism (9) comprises a fan (901) and a guide wheel (902), wherein the guide wheel (902) is fixedly connected to the top of the fan (901), a rotation groove (15) is provided inside the lens barrel (1), the guide wheel (902) is rotationally connected to the inside of the rotation groove (15), two grooves (16) are symmetrically provided at the top of the two ends of the inner wall of the lens barrel (1), the fan (901) is rotationally connected to the inside of the grooves (16), and one side of the rotation groove (15) is connected to one side of one of the guide grooves (703).

5. The multi-band laser beam expander according to claim 1, characterized in that: The flow dividing mechanism (10) comprises a flow dividing tube (101), a baffle (102) and a connecting wheel (103); the flow dividing tube (101) is fixedly connected to the interior of the lens barrel (1), and one end of the flow dividing tube (101) is communicated with one side of the flow guide groove (703); the other end of the flow dividing tube (101) is rotatably connected to the top of the guide wheel (902); the baffle (102) is rotatably connected to the interior of the flow dividing tube (101); the connecting wheel (103) is fixedly connected to one side of the baffle (102), and the connecting wheel (103) is rotatably connected to the interior of the lens barrel (1); a rack (17) is meshed on one side of the surface of the connecting wheel (103); a guide rod (18) is fixedly connected to the bottom of the rack (17); the other end of the guide rod (18) is fixedly connected to one of the pressure blocks (801); and the guide rod (18) and the rack (17) are both slidably connected to the interior of the lens barrel (1).

6. The multi-band laser beam expander according to claim 5, characterized in that: The water injection mechanism (11) comprises a water injection groove (111), a plurality of curved grooves (112) and a connecting chamber (113); the water injection groove (111) is arranged inside the fan (901), and the top of the water injection groove (111) is connected to one end of the shunt pipe (101) away from the baffle (102); the plurality of curved grooves (112) are evenly connected to the inside of the water injection groove (111); the plurality of curved grooves (112) are arranged inside the fan (901), one end of the plurality of curved grooves (112) away from the water injection groove (111) is connected to the connecting chamber (113), and the connecting chamber (113) is located below the water injection groove (111); the bottom of the fan (901) is rotatably connected to a guide tube (19), the other end of the guide tube (19) is connected to the annular groove (12), and the top end of the guide tube (19) is connected to the bottom of the connecting chamber (113).

7. The multi-band laser beam expander according to claim 5, characterized in that: A plurality of connecting tubes (20) are evenly arranged inside the lens barrel (1), and two ends of the connecting tubes (20) are respectively connected to two adjacent guide grooves (703), and the guide rod (18) is slidably connected to the bottom of the connecting tubes (20).

8. The multi-band laser beam expander according to claim 1, characterized in that: The surface of the lens barrel (1) is symmetrically provided with four air inlets (21) located on both sides of the water inlet (5), and the surface of the lens barrel (1) is symmetrically provided with two air outlets (22) located between the two water outlets (6), and both the air inlets (21) and the air outlets (22) are in communication with the interior of the lens barrel (1).

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