A fully sealed adjustable laser beam expander

Abstract

The present invention relates to the technical field of laser processing, and in particular to a fully sealed adjustable laser beam expander, which includes a sealing cover. An air inlet pipe is communicated with the outer peripheral wall of the sealing cover, and a plurality of air outlet pipes are communicated with the outer peripheral wall of the sealing cover. Two sliding rods are welded on the inner cavity side wall 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 inner cavity annular wall of the sealing cover, and the plurality of limiting rods are circumferentially distributed at equal intervals on the inner cavity annular wall of the sealing cover. An expansion air bag is arranged between the plurality of limiting rods. A sealing rubber strip is adhered to the side wall of the sealing cover. A plurality of air outlet holes I are formed on the outer peripheral wall of the sealing rubber strip. The arranged expansion air bag absorbs heat and expands, and the expanded expansion air bag 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.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and particularly 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, and its development process is closely linked to the continuous progress of laser technology. Since the first ruby laser was manufactured by Hughes Company in the United States in 1960, the various applications of lasers have developed extremely rapidly. Laser cutting technology has the advantages of narrow cutting seams, small workpiece deformation, good cutting surface quality, unlimited cutting shapes, non-contact processing, etc., so it has been widely used in industrial manufacturing. During the laser cutting process, the diameter and divergence angle of the laser beam have an important impact on the cutting effect. The original laser beam often has a certain divergence angle, and directly using it for cutting may lead to a decrease in cutting accuracy and efficiency. To solve this problem, an adjustable laser beam expander came into being. An adjustable laser beam expander is a lens assembly that can change the diameter and divergence angle of the laser beam. Its principle is similar to that of a telescope, and through the refraction and focusing effects of the lens, the expansion and collimation of the laser beam are achieved. In the field of laser cutting, the adjustable laser beam expander has significant advantages. During the process of using a laser beam expander for laser cutting, since the device is installed at the emission end of the laser cutting machine, the dust particles generated during the cutting process are easily affected by the airflow and invade the interior through the gap between the laser beam expander and the contact surface of the laser cutting machine. This phenomenon will not only reduce the cutting quality, but may also cause abnormal heating of the laser beam expander during use, thus causing equipment damage. Summary of the Invention

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

[0004] To achieve the above object, the present invention adopts the following technical solution: A fully sealed adjustable laser beam expander, comprising a sealing cover, an air inlet pipe is communicated with the outer peripheral wall of the sealing cover, a plurality of air outlet pipes are communicated with the outer peripheral wall of the sealing cover, and the plurality of air outlet pipes are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing cover. Two sliding rods are welded on the inner cavity side wall 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 inner cavity annular wall of the sealing cover, and the plurality of limiting rods are circumferentially distributed at equal intervals on the inner cavity annular wall of the sealing cover. An expansion airbag is arranged between the plurality of limiting rods. A sealing rubber strip is adhered to the side wall of the sealing cover. A plurality of air outlet holes I are formed on the outer peripheral wall of the sealing rubber strip, and the plurality of air outlet holes I are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing rubber strip. A plurality of one-way air valves II and one-way air valves III are adhered to the outer peripheral wall of the sealing rubber strip, and the plurality of one-way air valves II and one-way air valves III are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing rubber strip, and each one-way air valve III is sleeved on the outer wall of the corresponding one-way air valve II. Two air outlet holes II are formed on the outer wall of each one-way air valve II, and an air outlet hole III is formed on the outer wall of each one-way air valve III. The expansion airbag arranged absorbs heat and expands. The expanded expansion 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. Since the expansion airbag expands, the internal space of the sealing cover is compressed. At this time, part of the gas will sequentially pass through the air outlet hole I, the air outlet hole II and the air outlet hole III and discharge from the inner cavity of the sealing cover. At this time, the overall inner cavity of the sealing cover presents a positive pressure state, and external dust is not easily introduced into the inner cavity of the sealing cover.

[0005] In the above-mentioned fully sealed adjustable laser beam expander, a plurality of limiting through holes are penetrated through the annular wall of the expansion airbag, and the plurality of limiting through holes are circumferentially distributed at equal intervals on the annular wall of the expansion airbag, and the plurality of limiting rods are respectively located inside the corresponding limiting through holes. The arranged limiting rods can limit and restrain the expansion airbag to prevent it from shifting.

[0006] In the above-mentioned fully sealed adjustable laser beam expander, the diameter of the limiting rod is smaller than the diameter of the limiting through hole. An annular groove is formed on the inner cavity annular wall of the sealing cover, and the annular groove is communicated with the plurality of air outlet pipes. There is a gap between the limiting rod and the inner wall of the limiting through hole cavity. The arranged high-temperature air flow can flow into the annular groove through this gap.

[0007] In the above-mentioned fully sealed adjustable laser beam expander, the side of the expansion 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 arranged expansion airbag to push the sealing cover to move away from the laser cutting machine after absorbing heat and expanding.

[0008] In the above-mentioned fully sealed adjustable laser beam expander, an annular rubber strip is adhesively bonded to the inner cavity of the sealing rubber strip. A plurality of air outlet holes IV are penetrated through the annular wall of the annular rubber strip, and the plurality of air outlet holes IV are circumferentially distributed at equal intervals on the annular wall of the annular rubber strip. The annular rubber strip provided is pressed against the side of the inner cavity of the annular rubber strip close to the laser cutting machine by the end face of the sealing cover. This makes the annular rubber strip fit more tightly against the installation 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 installed on the side walls of the two mounting platforms. Magneto-couplers are fixedly installed at the output ends of the two motors. One ends of the two magneto-couplers located in the inner cavity of the sealing cover are fixedly installed with main gears through transmission rods. 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 magneto-coupler to rotate through the motor. The magneto-coupler provided drives the main gear to rotate through the transmission rod, and the main gear provided 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 the pressure difference, due to the width of the auxiliary gear ring being greater than the width of the main gear, the auxiliary gear ring and the main gear are always in a meshed state.

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

[0012] 1. The external air inlet pipeline passes low-temperature air flow into the sealing cover through the air inlet pipe. The low-temperature air flow entering can effectively dissipate heat from the beam expander body during the working process; the provided expansion air bag absorbs heat and expands, and the expanded expansion air bag will abut against the contact surface between the sealing cover and the laser cutting machine. This enhances the sealing effect of the contact surface between the sealing cover and the laser cutting machine; due to the expansion of the expansion air bag, the internal space of the sealing cover is compressed. At this time, the overall inner cavity of the sealing cover presents a positive pressure state, and external dust is not easily introduced into the inner cavity of the sealing cover;

[0013] 2. When the laser cutting machine stops working, the heat absorbed by the expansion air bag at this time will gradually dissipate to the outside of the sealing cover. The provided expansion air bag will contract, and then the inside of the sealing cover presents a negative pressure state. At this time, under the action of the pressure difference inside and outside the sealing cover, the external air pressure will push the sealing cover tightly against the installation surface of the laser cutting machine;

[0014] 3. The provided annular rubber strip is squeezed by the end face of the sealing cover and abuts against one 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 against the installation surface of the laser cutting machine, with a higher degree of fit and further enhanced sealing effect. Brief Description of the Drawings

[0015] Figure 1 Schematic structural diagram of an all-sealed adjustable laser beam expander proposed by the present invention;

[0016] Figure 2 Schematic diagram of the inner cavity structure of the sealing cover of the present invention;

[0017] Figure 3 Schematic structural diagram of the beam expander main body of the present invention;

[0018] Figure 4 Schematic structural diagram of the telescopic airbag of the present invention;

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

[0020] Figure 6 Schematic structural diagram of the limit rod of the present invention;

[0021] Figure 7 Schematic structural diagram of the sealing rubber strip of the present invention;

[0022] Figure 8 Schematic structural diagram of the annular rubber strip of the present invention;

[0023] Figure 9 Schematic diagram of the structure of the one-way air valve three of the present invention.

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

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention.

[0027] Referring to Figures 1 - 9 , a fully sealed adjustable laser beam expander, comprising a sealing cover 1. An air inlet pipe 2 is connected to the outer peripheral wall of the sealing cover 1. A plurality of air outlet pipes 3 are connected to the outer peripheral wall of the sealing cover 1, and the plurality of air outlet pipes 3 are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing cover 1. Two slide rods 4 are welded to the inner cavity side wall of the sealing cover 1. Sliders 5 are slidably arranged on the outer peripheral walls of the two slide rods 4. An expander lens body 6 is welded between the two sliders 5. A sealing strip 9 is adhered to the side wall of the sealing cover 1. The expander lens body 6 is fixed in the internal thread groove at the outgoing end of an external laser cutting machine by means of a threaded pipe at the end of the expander lens body 6. At this time, the head of the set 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.

[0028] Furthermore, two mounting platforms 19 are welded to the outer peripheral wall of the sealing cover 1. Motors 20 are fixedly installed on the side walls of the two mounting platforms 19. Magnetic coupling devices 21 are fixedly installed at the output ends of the two motors 20. Main gears 22 are fixedly installed at one ends of the two magnetic coupling devices 21 located in the inner cavity of the sealing cover 1 through transmission rods. Auxiliary gear rings 23 are fixedly sleeved on the outer peripheral walls of the two adjusting ends on both sides of the expander lens body 6, and the two auxiliary gear rings 23 are respectively engaged with the corresponding main gears 22. A laser beam is emitted from the outgoing end of an external laser cutting machine. After passing through the expander lens body 6, the laser beam irradiates on the cutting part of the workpiece, so as to perform cutting operations 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 coupling device 21 to rotate through the motor 20. The set magnetic coupling device 21 drives the main gear 22 to rotate through the transmission rod. The set main gear 22 drives the engaged gear ring to rotate, so as to adjust the adjusting end of the expander lens body 6.

[0029] Furthermore, a number of limiting rods 7 are welded on the inner cavity annular wall of the sealing cover 1, and the number of limiting rods 7 are circumferentially distributed at equal intervals on the inner cavity annular wall of the sealing cover 1. An expansion airbag 8 is arranged between the number of limiting rods 7. A number of limiting through holes 15 are arranged through the annular wall of the expansion airbag 8, and the number of limiting through holes 15 are circumferentially distributed at equal intervals on the annular wall of the expansion airbag 8. And the number of limiting rods 7 are respectively located inside the corresponding limiting through holes 15. The external air inlet pipe 2 passes low-temperature air flow into the inside of the sealing cover 1 through the air inlet pipe 2. The set low-temperature air flow is converted into high-temperature air flow after absorbing the heat dissipated by the beam expander body 6. Subsequently, this part of the high-temperature air flow enters the limiting through holes 15 of the expansion 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. The set high-temperature air flow can flow into the annular groove 16 through this gap. During this process, the set expansion airbag 8 absorbs heat and expands, and the expanded expansion 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. One side of the expansion 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. This makes it difficult for the set expansion airbag 8 to push the sealing cover 1 to move away from the laser cutting machine after absorbing heat and expanding. A number of air outlet holes one 10 are arranged on the outer peripheral wall of the sealing rubber strip 9, and the number of air outlet holes one 10 are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing rubber strip 9. A number of one-way air valves two 11 and one-way air valves three 12 are adhered to the outer peripheral wall of the sealing rubber strip 9, and the number of one-way air valves two 11 and one-way air valves three 12 are circumferentially distributed at equal intervals on the outer peripheral wall of the sealing rubber strip 9. And each one-way air valve three 12 is respectively sleeved on the outer wall of the corresponding one-way air valve two 11. Two air outlet holes two 13 are arranged on the outer wall of each one-way air valve two 11, and an air outlet hole three 14 is arranged on the outer wall of each one-way air valve three 12. Since the expansion airbag 8 expands, 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 one 10, the air outlet hole two 13 and the air outlet hole three 14 in sequence. At this time, the overall inner cavity of the sealing cover 1 presents a positive pressure state, and external dust is not easy to enter the inner cavity of the sealing cover 1. An annular groove 16 is arranged on the inner cavity annular wall of the sealing cover 1, and the annular groove 16 is communicated with a number of air outlet pipes 3. The high-temperature air flow flowing out of the limiting through hole 15 enters the annular groove 16. The set annular groove 16 connects a number of air outlet pipes 3, so that the high-temperature air flow can enter the air outlet pipes 3 more quickly. Finally, the high-temperature air flow is discharged into the external air outlet pipe 3 through the air outlet pipes 3.

[0030] Furthermore, an annular rubber strip 17 is adhesively bonded to the inner cavity of the sealing rubber strip 9. A number of fourth air vents 18 are penetrated through the annular wall of the annular rubber strip 17, and the number of fourth air vents 18 are circumferentially distributed at equal intervals on the annular wall of the annular rubber strip 17. When the laser cutting machine stops working and the external air inlet and outlet pipes 3 no longer conduct ventilation cooling operations, the heat absorbed by the telescopic airbag 8 at this time will gradually dissipate to the outside of the sealing cover 1. The set telescopic airbag 8 will contract, thereby causing a negative pressure state to appear inside the sealing cover 1. 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 against the installation surface of the laser cutting machine; the set annular rubber strip 17 is pressed by the end face of the sealing cover 1 and abuts against one 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 against the installation surface of the laser cutting machine, with a higher degree of 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 and the main gear 22 are always in a meshed state.

[0031] Working principle: Before use, fix the beam expander body 6 to the internal thread groove at the outlet end of the external laser cutting machine by means of the threaded pipe at the end of the beam expander body 6. At this time, the head of the set sealing rubber 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. Subsequently, connect the air inlet pipe 2 and the air outlet pipe 3 to the corresponding external air inlet pipe 2 path and air outlet pipe 3 path respectively;

[0032] During use, a laser beam is emitted from the emitting end of an external laser cutting machine. The laser beam irradiates the cutting part of the workpiece after passing through the beam expander body 6, so as to perform cutting operations 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. The set magnetic coupler 21 drives the main gear 22 to rotate through the transmission rod. The set 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. By changing the focal length of the lens or lens group inside the beam expander body 6, the magnification or reduction of the beam can be achieved, so as to meet different cutting requirements. At the same time, the external air inlet pipe 2 passes low-temperature air flow 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 and high-density laser beam, this laser beam will emit a lot of heat when passing through the beam expander body 6. The introduced low-temperature air flow can effectively dissipate heat from the beam expander body 6 during the working process. The set low-temperature air flow is converted into high-temperature air flow after absorbing the heat dissipated by the beam expander body 6. Subsequently, this part of the high-temperature air flow enters the limit through hole 15 of the expansion airbag 8. Since the diameter of the limit rod 7 is smaller than the diameter of the limit through hole 15, there is a gap between the limit rod 7 and the cavity wall of the limit through hole 15. The set high-temperature air flow can flow into the annular groove 16 through this gap. During this process, the set expansion airbag 8 absorbs heat and expands. The expanded expansion 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. Since the expansion airbag 8 expands, 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 first air outlet 10, the second air outlet 13 and the third air outlet 14 in sequence. At this time, the overall inner cavity of the sealing cover 1 presents a positive pressure state, and external dust is not easy to enter the inner cavity of the sealing cover 1. Among them, a plurality of set limit through holes 15 are circumferentially distributed at equal intervals on the ring wall of the expansion airbag 8, which makes the expansion airbag 8 evenly heated when the high-temperature air flow passes through the limit through hole 15. In addition, the side of the expansion 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 not easy for the expansion airbag 8 to push the sealing cover 1 to move away from the laser cutting machine after absorbing heat and expanding. The high-temperature air flow flowing out of the limit through hole 15 enters the annular groove 16. The set annular groove 16 connects a plurality of air outlet pipes 3, so that the high-temperature air flow can enter the air outlet pipes 3 more quickly. Finally, the high-temperature air flow is discharged into the external air outlet pipe 3 through the air outlet pipes 3.

[0033] When the laser cutting machine stops working, the external air inlet and outlet pipes no longer conduct ventilation 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 set telescopic airbag 8 will contract, thereby causing a negative pressure state inside the sealing cover 1. 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 tightly against the installation surface of the laser cutting machine; the set annular rubber strip 17 is pressed by the end face of the sealing cover 1 and abuts against one side of the inner cavity of the annular rubber strip close to the laser cutting machine. This makes the annular rubber strip abut more tightly against the installation surface of the laser cutting machine, with a higher degree of fit and further enhanced sealing effect; it should be noted that the set check valve two 11 and check valve three 12 only allow the gas inside the sealing cover 1 to be discharged. When a negative pressure exists inside the sealing cover 1, the external air pressure will cause the inner wall of the check valve three 12 to closely adhere to the outer wall of the check valve two 11. At this time, the set air vent two is in a blocked state, and external gas is not easily introduced into the sealing cover 1.

[0034] Further explanation: For the above fixed connection, unless otherwise clearly specified and limited, it should be understood in a broad sense. For example, it can be welding, gluing, or integrally formed setting, etc., which are common means well-known to those skilled in the art.

[0035] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within 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), 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 to the inner cavity side wall 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 to 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 strip (9) is bonded to the side wall of the sealing cover (1), and the outer peripheral wall of the sealing strip (9) is provided with a plurality of air bags (8). A plurality of air outlet holes (10) are provided on the upper surface, 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 (11) and one-way valves (12) are bonded to the outer peripheral wall of the sealing strip (9); the plurality of one-way valves (11) and one-way valves (12) are evenly spaced and circumferentially distributed on the outer peripheral wall of the sealing strip (9); each one-way valve (12) is respectively sleeved on the outer wall of the corresponding one-way valve (11); the plurality of one-way valves (11) and one-way valves (12) only allow the gas inside the sealing cover (1) to be discharged; each one-way valve (11) has two air outlet holes (13) on its outer wall, and each one-way valve (12) has an air outlet hole (14) on its outer wall; 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 corresponding limiting through holes (15); 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 wall of the sealing cover (1), and the annular groove (16) is connected to a plurality of air outlet pipes (3).

2. A 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).

3. 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 formed through the wall of the annular rubber strip (17), and the plurality of air outlet holes (18) are equidistantly distributed on the wall of the annular rubber strip (17).

4. 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).

5. The fully sealed adjustable laser beam expander according to claim 4, 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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