Fully-sealed adjustable laser beam expander

Abstract

The invention relates to the technical field of laser processing, in particular to a fully-sealed adjustable laser beam expander which comprises a sealing cover, an air inlet pipe is communicated with the peripheral wall of the sealing cover, a plurality of air outlet pipes are communicated with the peripheral wall of the sealing cover, and two sliding rods are welded to the side wall of an inner cavity of the sealing cover. Sliding blocks are arranged on the peripheral walls of the two sliding rods in a sliding mode, a beam expander body is welded between the two sliding blocks, a plurality of limiting rods are welded to the annular wall of an inner cavity of the sealing cover and circumferentially distributed on the annular wall of the inner cavity of the sealing cover at equal intervals, and telescopic air bags are arranged between the limiting rods; a sealing rubber strip adheres to the side wall of the sealing cover, a plurality of first air outlet holes are formed in the peripheral wall of the sealing rubber strip, the arranged telescopic air bag expands after absorbing heat, the expanded telescopic air bag can abut against the contact face of the sealing cover and the laser cutting machine, and therefore the sealing effect of the contact face of the sealing cover and the laser cutting machine is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of laser processing, and in particular to a fully sealed adjustable laser beam expander. Background Art

[0002] Laser cutting technology is a technology with high production efficiency and strong production capacity. Its development history is closely linked to the continuous progress of laser technology. Since the Hughes Company in the United States manufactured the world's first ruby ​​laser in 1960, the various applications of lasers have developed extremely rapidly. Laser cutting technology has the advantages of narrow cutting slits, small deformation of workpieces, good cutting surface quality, unlimited cutting shape, and non-contact processing. Therefore, it has been widely used in industrial manufacturing. In the laser cutting process, the diameter and divergence angle of the laser beam have an important influence on the cutting effect. The original laser beam often has a certain divergence angle, and direct use for cutting may lead to a decrease in cutting accuracy and efficiency. In order to solve this problem, an adjustable laser beam expander came into being. The adjustable laser beam expander is a lens component that can change the diameter and divergence angle of the laser beam. Its principle is similar to that of a telescope. Through the refraction and focusing of the lens, the laser beam is expanded and collimated. In the field of laser cutting, the adjustable laser beam expander has significant advantages. During laser cutting using a laser beam expander, since the device is installed at the transmitting end of the laser cutting machine, the smoke particles generated during the cutting process are easily affected by the airflow and penetrate into the interior through the gap between the laser beam expander and the laser cutting machine. This phenomenon not only reduces the cutting quality, but may also cause the laser beam expander to heat abnormally during use, thereby causing damage to the equipment. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and to propose a fully sealed adjustable laser beam expander.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fully sealed adjustable laser beam expander, comprising a sealing cover, an air inlet pipe is connected to the outer peripheral wall of the sealing cover, a plurality of air outlet pipes are connected to the outer peripheral wall of the sealing cover, and the plurality of air outlet pipes are equidistantly distributed on the outer peripheral wall of the sealing cover, two sliding rods are welded on the side wall of the inner cavity of the sealing cover, sliders are slidably arranged on the outer peripheral walls of the two sliding rods, a beam expander body is welded between the two sliders, a plurality of limiting rods are welded on the annular wall of the inner cavity of the sealing cover, and the plurality of limiting rods are equidistantly distributed on the annular wall of the inner cavity of the sealing cover, a telescopic airbag is arranged between the plurality of limiting rods, a sealing strip is bonded to the side wall of the sealing cover, a plurality of air outlet holes are opened on the outer peripheral wall of the sealing strip, and the plurality of air outlet holes are equidistantly distributed on the outer peripheral wall of the sealing strip, A plurality of one-way valves two and three are bonded to the outer wall of the sealing strip, and the plurality of one-way valves two and three are evenly spaced and circumferentially distributed on the outer wall of the sealing strip, and each one-way valve three is respectively sleeved on the outer wall of the corresponding one-way valve two, and each one-way valve two is provided with two air outlet holes two on the outer wall, and each one-way valve three is provided with an air outlet hole three on the outer wall. The arranged telescopic airbag absorbs heat and expands, and the expanded telescopic airbag will abut against the contact surface between the sealing cover and the laser cutting machine, which enhances the sealing effect of the contact surface between the sealing cover and the laser cutting machine; due to the expansion of the telescopic airbag, the internal space of the sealing cover is compressed, and at this time, part of the gas will be discharged from the inner cavity of the sealing cover through the air outlet hole one, the air outlet hole two and the air outlet hole three in turn, and at this time, the inner cavity of the sealing cover is in a positive pressure state as a whole, and external dust is not easy to enter the inner cavity of the sealing cover.

[0005] In the above-mentioned fully sealed adjustable laser beam expander, a plurality of limit holes are arranged through the annular wall of the telescopic airbag, and the plurality of limit holes are equidistantly distributed on the annular wall of the telescopic airbag, and a plurality of limit rods are respectively located inside the corresponding limit holes. The set limit rods can limit and constrain the telescopic airbag to prevent it from shifting.

[0006] In the above-mentioned fully sealed adjustable laser beam expander, the diameter of the limit rod is smaller than the diameter of the limit through hole, an annular groove is provided on the annular wall of the inner cavity of the sealing cover, and the annular groove is connected to a plurality of air outlet pipes, and there is a gap between the limit rod and the cavity wall of the limit through hole, and the set high-temperature airflow can flow into the annular groove through the gap.

[0007] In the above-mentioned fully sealed adjustable laser beam expander, the side of the telescopic airbag close to the inner cavity side wall of the sealing cover does not abut against the inner cavity side wall of the sealing cover. This makes it difficult for the telescopic airbag to push the sealing cover to move away from the laser cutting machine after the telescopic airbag absorbs heat and expands.

[0008] In the above-mentioned fully sealed adjustable laser beam expander, an annular rubber strip is bonded to the inner cavity of the sealing strip, and a plurality of air outlet holes four are opened through the ring wall of the annular rubber strip, and the plurality of air outlet holes four are equidistantly distributed on the ring wall of the annular rubber strip. The annular rubber strip is squeezed by the end face of the sealing cover and abuts against the side of the inner cavity of the annular rubber strip close to the laser cutting machine, which makes the annular rubber strip abut more tightly against the mounting surface of the laser cutting machine, and the sealing effect is further enhanced.

[0009] In the above-mentioned fully sealed adjustable laser beam expander, two mounting platforms are welded on the outer peripheral wall of the sealing cover, motors are fixedly mounted on the side walls of the two mounting platforms, magnetic couplers are fixedly mounted on the output ends of the two motors, and main gears are fixedly mounted on one end of the two magnetic couplers located in the inner cavity of the sealing cover through a transmission rod, and auxiliary gear rings are fixedly sleeved on the outer peripheral walls of the adjustment ends on both sides of the beam expander body, and the two auxiliary gear rings are respectively meshed with the corresponding main gears. When it is necessary to adjust the beam diameter and divergence angle of the laser, the staff can drive the magnetic coupler to rotate through the motor, and the set magnetic coupler drives the main gear to rotate through the transmission rod, and the set main gear drives the gear ring meshed with it to rotate, so as to adjust the adjustment end of the beam expander body.

[0010] In the above-mentioned fully sealed adjustable laser beam expander, the width of the auxiliary gear ring is greater than the width of the main gear. When the sealing cover is displaced under the action of pressure difference, the auxiliary gear ring is always in a meshing state with the main gear because the width of the auxiliary gear ring is greater than the width of the main gear.

[0011] Compared with the existing technology, the advantages of this fully sealed adjustable laser beam expander are:

[0012] 1. The external air intake pipeline introduces low-temperature airflow into the sealing cover through the air intake pipe. The entering low-temperature airflow can effectively dissipate heat for the main body of the beam expander during operation. The telescopic airbag absorbs heat and expands. The expanded telescopic airbag abuts against the contact surface between the sealing cover and the laser cutting machine, which enhances the sealing effect of the contact surface between the sealing cover and the laser cutting machine. As the telescopic airbag expands, the internal space of the sealing cover is compressed. At this time, the inner cavity of the sealing cover is in a positive pressure state as a whole, and external dust is not easy to enter the inner cavity of the sealing cover.

[0013] 2. When the laser cutting machine stops working, the heat absorbed by the telescopic airbag will gradually dissipate to the outside of the sealing cover, and the telescopic airbag will shrink, causing the inside of the sealing cover to be in a negative pressure state. At this time, under the action of the pressure difference between the inside and outside of the sealing cover, the external air pressure will push the sealing cover to fit tightly against the installation surface of the laser cutting machine;

[0014] 3. The annular rubber strip is squeezed by the end face of the sealing cover and abuts against the inner cavity of the annular rubber strip on the side close to the laser cutting machine. This makes the annular rubber strip abut against the mounting surface of the laser cutting machine more closely, with a higher fit and further enhanced sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a fully sealed adjustable laser beam expander proposed by the present invention;

[0016] Figure 2 It is a schematic diagram of the inner cavity structure of the sealing cover of the present invention;

[0017] Figure 3 It is a schematic diagram of the main structure of the beam expander of the present invention;

[0018] Figure 4 It is a schematic diagram of the structure of the telescopic airbag of the present invention;

[0019] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A;

[0020] Figure 6 It is a schematic diagram of the limit rod structure of the present invention;

[0021] Figure 7 It is a schematic diagram of the structure of the sealing strip of the present invention;

[0022] Figure 8 It is a schematic diagram of the structure of the annular rubber strip of the present invention;

[0023] Fig. 9 It is a schematic diagram of the three structures of the one-way valve of the present invention.

[0024] In the figure: 1. Sealing cover; 2. Air inlet pipe; 3. Air outlet pipe; 4. Sliding rod; 5. Sliding block; 6. Beam expander body; 7. Limiting rod; 8. Telescopic airbag; 9. Sealing strip; 10. Air outlet hole one; 11. One-way valve two; 12. One-way valve three; 13. Air outlet hole two; 14. Air outlet hole three; 15. Limiting through hole; 16. Annular groove; 17. Annular rubber strip; 18. Air outlet hole four; 19. Mounting table; 20. Motor; 21. Magnetic coupler; 22. Main gear; 23. Auxiliary gear ring. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] Reference Figure 1-Figure 9 A fully sealed adjustable laser beam expander comprises a sealing cover 1, an air inlet pipe 2 is connected on the outer peripheral wall of the sealing cover 1, a plurality of air outlet pipes 3 are connected on the outer peripheral wall of the sealing cover 1, and the plurality of air outlet pipes 3 are equidistantly distributed on the outer peripheral wall of the sealing cover 1, two sliding bars 4 are welded on the inner cavity side wall of the sealing cover 1, sliders 5 are slidably arranged on the outer peripheral walls of the two sliding bars 4, a beam expander body 6 is welded between the two sliders 5, a sealing strip 9 is bonded to the side wall of the sealing cover 1, and the beam expander body 6 is fixed in the internal thread groove of the output end of the external laser cutting machine by means of the threaded tube at the end thereof, at which time the head of the sealing strip 9 is squeezed and deformed to a certain extent, thereby enhancing the sealing effect of the contact surface between the sealing cover 1 and the laser cutting machine.

[0028] Furthermore, two mounting platforms 19 are welded on the outer peripheral wall of the sealing cover 1, and motors 20 are fixedly installed on the side walls of the two mounting platforms 19. Magnetic couplers 21 are fixedly installed on the output ends of the two motors 20. The two magnetic couplers 21 are located at one end of the inner cavity of the sealing cover 1 and are fixedly installed with main gears 22 through transmission rods. Auxiliary gear rings 23 are fixedly sleeved on the outer peripheral walls of the adjustment ends on both sides of the collimator body 6, and the two auxiliary gear rings 23 are respectively meshed with the corresponding main gears 22. The external laser cutting machine emits a laser beam at the output end, and the laser beam irradiates the cutting part of the workpiece after passing through the collimator body 6, so as to perform a cutting operation on the workpiece to be cut; when it is necessary to adjust the beam diameter and divergence angle of the laser, the staff can drive the magnetic coupler 21 to rotate through the motor 20, and the set magnetic coupler 21 drives the main gear 22 to rotate through the transmission rod, and the set main gear 22 drives the gear ring meshed with it to rotate, so as to adjust the adjustment end of the collimator body 6.

[0029] Furthermore, a plurality of limiting rods 7 are welded on the inner cavity annular wall of the sealing cover 1, and the plurality of limiting rods 7 are equidistantly distributed on the inner cavity annular wall of the sealing cover 1, a telescopic airbag 8 is arranged between the plurality of limiting rods 7, a plurality of limiting through holes 15 are penetrated on the annular wall of the telescopic airbag 8, and the plurality of limiting through holes 15 are equidistantly distributed on the annular wall of the telescopic airbag 8, and the plurality of limiting rods 7 are respectively located inside the corresponding limiting through holes 15, and an external air inlet pipe 2 introduces a low-temperature airflow into the interior of the sealing cover 1 through the air inlet pipe 2, and the set low-temperature airflow is converted into a high-temperature airflow after absorbing the heat emitted by the collimator body 6, and then this part of the high-temperature airflow enters the telescopic airbag 8. The limiting through hole 15 of the bag 8; since the diameter of the limiting rod 7 is smaller than the diameter of the limiting through hole 15, there is a gap between the limiting rod 7 and the cavity wall of the limiting through hole 15, and the set high-temperature airflow can flow into the annular groove 16 through this gap; in this process, the set telescopic airbag 8 absorbs heat and expands, and the expanded telescopic airbag 8 will abut on the contact surface between the sealing cover 1 and the laser cutting machine, which enhances the sealing effect of the contact surface between the sealing cover 1 and the laser cutting machine; the side of the telescopic airbag 8 close to the inner cavity side wall of the sealing cover 1 does not abut on the inner cavity side wall of the sealing cover 1, which makes it difficult for the set telescopic airbag 8 to push the sealing cover 1 away from the laser after the telescopic airbag 8 absorbs heat and expands. The direction of the optical cutting machine is moved; a plurality of air outlet holes 10 are opened on the outer peripheral wall of the sealing strip 9, and the plurality of air outlet holes 10 are evenly spaced and circumferentially distributed on the outer peripheral wall of the sealing strip 9, a plurality of one-way valves 2 11 and one-way valves 3 12 are bonded to the outer peripheral wall of the sealing strip 9, and the plurality of one-way valves 2 11 and one-way valves 3 12 are evenly spaced and circumferentially distributed on the outer peripheral wall of the sealing strip 9, and each one-way valve 3 12 is respectively sleeved on the outer wall of the corresponding one-way valve 2 11, and each one-way valve 2 11 has two air outlet holes 2 13 on its outer wall, and each one-way valve 3 12 has an air outlet hole 3 14 on its outer wall. Due to the expansion of the telescopic airbag 8 The air in the sealing cover 1 expands and the internal space of the sealing cover 1 is compressed. At this time, part of the gas will be discharged from the inner cavity of the sealing cover 1 through the air outlet hole 10, the air outlet hole 2 13 and the air outlet hole 3 14 in sequence. At this time, the inner cavity of the sealing cover 1 is in a positive pressure state as a whole, and external dust is not easy to enter the inner cavity of the sealing cover 1; an annular groove 16 is provided on the annular wall of the inner cavity of the sealing cover 1, and the annular groove 16 is connected with several air outlet pipes 3. The high-temperature airflow flowing out of the limiting through hole 15 enters the annular groove 16. The annular groove 16 connects several air outlet pipes 3, so that the high-temperature airflow can enter the air outlet pipe 3 more quickly, and finally the high-temperature airflow is discharged into the external air outlet pipe 3 through the air outlet pipe 3.

[0030] Furthermore, an annular rubber strip 17 is bonded to the inner cavity of the sealing rubber strip 9, and a plurality of air outlet holes 18 are formed on the ring wall of the annular rubber strip 17, and the plurality of air outlet holes 18 are evenly spaced and circumferentially distributed on the ring wall of the annular rubber strip 17. When the laser cutting machine stops working, the external air inlet and outlet pipes 3 no longer perform ventilation and cooling operations. At this time, the heat absorbed by the telescopic airbag 8 will gradually dissipate to the outside of the sealing cover 1, and the telescopic airbag 8 will shrink, thereby causing the inside of the sealing cover 1 to present a negative pressure state. At this time, the pressure inside and outside the sealing cover 1 is negative. Under the action of the force difference, the external air pressure will push the sealing cover 1 tightly against the mounting surface of the laser cutting machine; the annular rubber strip 17 is squeezed by the end face of the sealing cover 1 and abuts against the side of the inner cavity of the annular rubber strip close to the laser cutting machine, which makes the annular rubber strip abut against the mounting surface of the laser cutting machine more closely, with a higher fit and further enhanced sealing effect; when the sealing cover 1 is displaced under the action of the pressure difference, since the width of the auxiliary gear ring 23 is greater than the width of the main gear 22, the auxiliary gear ring 23 is always in a meshing state with the main gear 22.

[0031] Working principle: Before use, the beam expander body 6 is fixed in the internal thread groove of the output end of the external laser cutting machine by means of the threaded tube at the end thereof. At this time, the head of the sealing strip 9 is squeezed and deformed to a certain extent, which enhances the sealing effect of the contact surface between the sealing cover 1 and the laser cutting machine. Then, the air inlet pipe 2 and the air outlet pipe 3 are connected to the corresponding air inlet pipe 2 and air outlet pipe 3 of the outside respectively;

[0032] When in use, the laser cutting machine emits a laser beam from the output end, and the laser beam irradiates the cutting part of the workpiece after passing through the beam expander body 6, so as to perform a cutting operation on the workpiece to be cut; when it is necessary to adjust the beam diameter and divergence angle of the laser, the staff can drive the magnetic coupler 21 to rotate through the motor 20, and the magnetic coupler 21 drives the main gear 22 to rotate through the transmission rod, and the main gear 22 drives the gear ring meshed with it to rotate, so as to adjust the adjustment end of the beam expander body 6, and by changing the focal length of the lens or lens group inside the beam expander body 6, the beam can be magnified or reduced, so as to meet different Cutting requirements; at the same time, the external air inlet pipe 2 introduces a low-temperature airflow into the sealing cover 1 through the air inlet pipe 2. Since the laser beam emitted by the laser cutting machine is usually a high-power, high-density laser beam, this laser beam will emit more heat when passing through the beam expander body 6. The introduced low-temperature airflow can effectively dissipate the heat of the beam expander body 6 during the working process; the set low-temperature airflow is converted into a high-temperature airflow after absorbing the heat emitted by the beam expander body 6, and then this part of the high-temperature airflow enters the limiting through hole 15 of the telescopic airbag 8. Since the diameter of the limiting rod 7 is smaller than the diameter of the limiting through hole 15, there is a gap between the limiting rod 7 and the cavity wall of the limiting through hole 15, and the setting The high-temperature airflow can flow into the annular groove 16 through this gap; in this process, the telescopic airbag 8 absorbs heat and expands, and the expanded telescopic airbag 8 will abut against the contact surface between the sealing cover 1 and the laser cutting machine, which enhances the sealing effect of the contact surface between the sealing cover 1 and the laser cutting machine; due to the expansion of the telescopic airbag 8, the internal space of the sealing cover 1 is compressed, and at this time, part of the gas will be discharged from the inner cavity of the sealing cover 1 through the air outlet hole 10, the air outlet hole 2 13 and the air outlet hole 3 14 in sequence. At this time, the inner cavity of the sealing cover 1 is in a positive pressure state as a whole, and external dust is not easy to enter the inner cavity of the sealing cover 1; wherein, a plurality of limit through holes 15 are arranged at equal intervals and circumferentially distributed on the sealing cover 1. On the annular wall of the telescopic airbag 8, this move allows the arranged telescopic airbag 8 to be evenly heated when the high-temperature airflow passes through the limiting through hole 15; in addition, the side of the arranged telescopic airbag 8 close to the inner cavity side wall of the sealing cover 1 does not abut against the inner cavity side wall of the sealing cover 1, which makes it difficult for the arranged telescopic airbag 8 to push the sealing cover 1 to move away from the laser cutting machine after the telescopic airbag 8 absorbs heat and expands; the high-temperature airflow flowing out of the limiting through hole 15 enters the annular groove 16, and the arranged annular groove 16 connects several outlet pipes 3, so that the high-temperature airflow can enter the outlet pipe 3 more quickly, and finally the high-temperature airflow is discharged into the external outlet pipe 3 through the outlet pipe 3;

[0033] When the laser cutting machine stops working, the external air inlet and outlet pipes 3 no longer perform ventilation and cooling operations. At this time, the heat absorbed by the telescopic airbag 8 will gradually dissipate to the outside of the sealing cover 1, and the telescopic airbag 8 will shrink, thereby causing the inside of the sealing cover 1 to be in a negative pressure state. At this time, under the action of the pressure difference between the inside and outside of the sealing cover 1, the external air pressure will push the sealing cover 1 to be tightly attached to the mounting surface of the laser cutting machine; the annular rubber strip 17 is squeezed by the end face of the sealing cover 1 and abuts against the side of the inner cavity of the annular rubber strip close to the laser cutting machine. This makes the annular rubber strip abut more closely with the mounting surface of the laser cutting machine, with a higher fit and further enhanced sealing effect; it should be noted that the one-way valve 2 11 and the one-way valve 3 12 only allow the gas inside the sealing cover 1 to be discharged. When the inside of the sealing cover 1 is under negative pressure, the external air pressure will cause the inner wall of the one-way valve 3 12 to be tightly attached to the outer wall of the one-way valve 2 11. At this time, the vent 2 is in a blocked state, and it is not easy for external gas to enter the inside of the sealing cover 1.

[0034] 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.

[0035] 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 fully sealed adjustable laser beam expander, comprising a sealing cover (1), characterized in that: The outer peripheral wall of the sealing cover (1) is connected to an air inlet pipe (2), and the outer peripheral wall of the sealing cover (1) is connected to a plurality of air outlet pipes (3), and the plurality of air outlet pipes (3) are equidistantly distributed on the outer peripheral wall of the sealing cover (1). Two sliding bars (4) are welded on the side wall of the inner cavity of the sealing cover (1), and sliding blocks (5) are slidably arranged on the outer peripheral walls of the two sliding bars (4), and a beam expander body (6) is welded between the two sliding blocks (5). A plurality of limiting rods (7) are welded on the inner cavity annular wall of the sealing cover (1), and the plurality of limiting rods (7) are equidistantly distributed on the inner cavity annular wall of the sealing cover (1), and a telescopic air bag (8) is arranged between the plurality of limiting rods (7), and a sealing cover (1) is bonded to the side wall. A sealing strip (9), wherein a plurality of air outlet holes (10) are provided on the outer peripheral wall of the sealing strip (9), and the plurality of air outlet holes (10) are equidistantly distributed on the outer peripheral wall of the sealing strip (9); a plurality of one-way valves (11) and one-way valves (12) are bonded to the outer peripheral wall of the sealing strip (9), and the plurality of one-way valves (11) and one-way valves (12) are equidistantly distributed on the outer peripheral wall of the sealing strip (9), and each one-way valve (12) is respectively sleeved on the outer wall of the corresponding one-way valve (11); each one-way valve (11) has two air outlet holes (13) provided on its outer wall, and each one-way valve (12) has an air outlet hole (14) provided on its outer wall.

2. The fully sealed adjustable laser beam expander according to claim 1, characterized in that: A plurality of limiting through holes (15) are provided through the annular wall of the telescopic airbag (8), and the plurality of limiting through holes (15) are circumferentially distributed at equal intervals on the annular wall of the telescopic airbag (8), and the plurality of limiting rods (7) are respectively located inside the corresponding limiting through holes (15).

3. The fully sealed adjustable laser beam expander according to claim 2, characterized in that: The diameter of the limiting rod (7) is smaller than the diameter of the limiting through hole (15); an annular groove (16) is provided on the inner ring wall of the sealing cover (1), and the annular groove (16) is connected to a plurality of air outlet pipes (3).

4. The fully sealed adjustable laser beam expander according to claim 1, characterized in that: The side of the telescopic airbag (8) close to the inner cavity side wall of the sealing cover (1) does not abut against the inner cavity side wall of the sealing cover (1).

5. The fully sealed adjustable laser beam expander according to claim 1, characterized in that: An annular rubber strip (17) is bonded to the inner cavity of the sealing rubber strip (9), and a plurality of air outlet holes (18) are provided through the annular wall of the annular rubber strip (17), and the plurality of air outlet holes (18) are equidistantly distributed on the annular wall of the annular rubber strip (17).

6. The fully sealed adjustable laser beam expander according to claim 1, characterized in that: Two mounting platforms (19) are welded on the outer peripheral wall of the sealing cover (1), and motors (20) are fixedly mounted on the side walls of the two mounting platforms (19). Magnetic couplers (21) are fixedly mounted on the output ends of the two motors (20), and main gears (22) are fixedly mounted on one end of the two magnetic couplers (21) located in the inner cavity of the sealing cover (1) through a transmission rod. Auxiliary gear rings (23) are fixedly sleeved on the outer peripheral walls of the adjustment ends on both sides of the beam expander body (6), and the two auxiliary gear rings (23) are respectively meshed with the corresponding main gears (22).

7. The fully sealed adjustable laser beam expander according to claim 6, characterized in that: The width of the auxiliary gear ring (23) is greater than the width of the main gear (22).

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