CN219366458U - Weak-power air cylinder - Google Patents
Weak-power air cylinder Download PDFInfo
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- CN219366458U CN219366458U CN202320269581.3U CN202320269581U CN219366458U CN 219366458 U CN219366458 U CN 219366458U CN 202320269581 U CN202320269581 U CN 202320269581U CN 219366458 U CN219366458 U CN 219366458U
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Abstract
The utility model discloses a weakly-moving cylinder, which relates to the technical field of pneumatic elements and comprises a cylinder barrel, wherein one side part of the cylinder barrel is provided with a rear cover through a first temperature-resistant mechanism, the other side part of the cylinder barrel is provided with a front cover through a second temperature-resistant mechanism, the side part of the front cover, which is far away from the cylinder barrel, is provided with a dustproof cover plate through a guide mechanism, the top of the cylinder barrel is provided with a valve block, the side part of the valve block is provided with two aluminum air pipes, the two aluminum air pipes are connected with the rear cover, both ends of the aluminum air pipes are provided with third temperature-resistant mechanisms, and the rear cover is provided with through holes. The sealing ring with more excellent low temperature resistance is reasonable in structure, and not only meets the low temperature performance, but also meets the effect of the sealing ring in the air cylinder, so that the conditions of gas leakage, creeping and the like of the air cylinder are reduced when the sealing ring is used in environments such as extremely cold and low temperature, the high-speed railway door is ensured to be capable of normally opening or closing the door, and the running and safety of a train are ensured.
Description
Technical Field
The utility model relates to the technical field of pneumatic elements, in particular to a weak-motion cylinder.
Background
The weak-motion air cylinder increases air pressure through a piston, then the air pressure is transmitted to convert the pressure of compressed air into mechanical energy, and the driving mechanism linearly reciprocates; when the rod cavity is used for air intake and the rodless cavity is used for air exhaust, the piston rod is retracted, if the rod cavity and the rodless cavity are used for alternately air intake and air exhaust, the piston can do reciprocating linear motion, a double-piston action mode is adopted, a movable piston is additionally arranged on the piston, the pressure difference between the air intake and the air exhaust of the inner piston is slowed down through smaller air holes on two sides, and the function of buffering on two sides is achieved.
The weak-acting air cylinder used in the high-speed rail door system at the present stage is required to be applied to environments such as extremely cold low temperature (-41 ℃) and the like, the conditions such as gas leakage, crawling and the like of different degrees can appear in the traditional weak-acting air cylinder at low temperature, after a period of use, buffering time is inconsistent when opening and closing the door, buffering needs to be adjusted frequently, and the door can not be opened or closed normally when serious, so that the operation and safety of a train are influenced.
Disclosure of Invention
The present application is directed to a weak cylinder to solve the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions: the weak-motion air cylinder comprises a cylinder barrel, a rear cover is arranged on one side part of the cylinder barrel through a first temperature-resistant mechanism, a front cover is arranged on the other side part of the cylinder barrel through a second temperature-resistant mechanism, a dustproof cover plate is arranged on the side part of the front cover away from the cylinder barrel through a guide mechanism, a valve block is arranged at the top of the cylinder barrel, two aluminum air pipes are arranged on the side part of the valve block, the two aluminum air pipes are connected with the rear cover, third temperature-resistant mechanisms are arranged at two ends of the aluminum air pipes, through holes are formed in the rear cover, the through holes are communicated with the cylinder barrel and the aluminum air pipes, two pressure regulating valves and inlet and outlet joint interfaces are arranged on the front cover and the valve block, the inlet and outlet joint interfaces on the valve block are communicated with the two aluminum air pipes, the inlet and outlet joint interfaces on the front cover are communicated with the cylinder barrel, the inner piston cylinder is slidably mounted with an inner piston cylinder, two ends of the inner piston cylinder are respectively provided with a piston front cover and a piston rear cover, the piston front cover is close to the side part and the circumference side part of the inner piston cylinder, a first air hole is formed in the side part of the piston rear cover, which is far away from the inner piston cylinder, is provided with a second air hole, the inner piston cylinder is mounted with the inner wall of the cylinder in a matched manner through two fourth temperature-resistant mechanisms, the two fourth temperature-resistant mechanisms are respectively close to the piston rear cover and the piston front cover, a piston rod is slidably mounted in the inner piston cylinder, the piston rod is positioned at one end of the inner piston cylinder, a first axial center ring and a first piston ring are mounted on the inner piston, the first axial center ring is in sliding connection with the inner wall of the inner piston cylinder, and the other end of the piston rod sequentially penetrates through the piston front cover, the front cover and the dust cover plate.
Preferably, the first air hole and the second air hole have a diameter of.mm.
Preferably, the first temperature-resistant mechanism comprises a first buffer ring, a second buffer ring and a first pipe wall ring, the second buffer ring, the first buffer ring and the first pipe wall ring are sequentially arranged along the cylinder barrel to the rear cover, a first connecting pipe communicated with the through hole is arranged on the side portion of the rear cover, the first connecting pipe extends to the cylinder barrel, the first pipe wall ring is sleeved on the first connecting pipe, the first buffer ring is arranged on the side portion of the first connecting pipe, the second buffer ring is arranged on the side portion of the first buffer ring, and the first pipe wall ring is in contact with the cylinder barrel.
Preferably, the second temperature-resistant mechanism comprises a second pipe wall ring and a third buffer ring, a mounting hole is formed in the side portion of the front cover, a second connecting pipe is mounted in the mounting hole, one end of the second connecting pipe extends to the cylinder barrel, the second pipe wall ring is sleeved on the second connecting pipe, the third buffer ring is mounted on the side portion, close to the cylinder barrel, of the second connecting pipe, and the side portion of the second pipe wall ring is in contact with the cylinder barrel.
Preferably, the third temperature-resistant mechanism comprises two third pipe wall rings, the two third pipe wall rings are respectively arranged at the end parts of the two aluminum air pipes, and the two third pipe wall rings are used for sealing the two aluminum air pipes, the valve block or the two aluminum air pipes and the rear cover.
Preferably, the second pipe wall ring, the third buffer ring, the third pipe wall ring, the second buffer ring, the first buffer ring and the first pipe wall ring are all O-shaped, the second pipe wall ring, the third buffer ring, the third pipe wall ring, the second buffer ring, the first buffer ring and the first pipe wall ring are hydrogenated nitrile rubber rings, and the second pipe wall ring, the third buffer ring, the third pipe wall ring, the second buffer ring, the first buffer ring and the first pipe wall ring are all provided with recesses.
Preferably, the guiding mechanism comprises a copper sleeve arranged in the second connecting pipe, a dust ring is arranged on the side portion of the copper sleeve, the dust ring is matched with the dust cover plate, one end of the piston rod penetrates through the copper sleeve and the dust ring in sequence, and the copper sleeve is a graphite copper sleeve.
Preferably, the fourth temperature-resistant mechanism comprises a second piston ring and a second piston ring, the second piston ring and the second piston ring are both sleeved on the inner piston cylinder, the second piston ring is in contact with the inner wall of the cylinder barrel, the second piston ring and the first piston ring are polytetrafluoroethylene rings, and the second piston ring and the first shaft ring are fluorine rubber rings.
In summary, the utility model has the technical effects and advantages that:
the sealing ring with more excellent low temperature resistance is reasonable in structure, and not only meets the low temperature performance, but also meets the effect of the sealing ring in the air cylinder, so that the conditions of gas leakage, creeping and the like of the air cylinder are reduced when the sealing ring is used in environments such as extremely cold and low temperature, the high-speed railway door is ensured to be capable of normally opening or closing the door, and the running and safety of a train are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded perspective view of an embodiment of the present application;
FIG. 2 is a perspective view of the piston rod of the present embodiment when retracted;
FIG. 3 is a perspective view of an embodiment of the present application with a piston rod extended;
fig. 4 is a perspective view of a piston rear cover and a piston front cover of an embodiment of the present application.
In the figure: 1. a dust-proof cover plate; 2. a dust ring; 3. a pressure regulating valve; 4. a copper sleeve; 5. a front cover; 6. a pipe wall ring; 7. a buffer ring; 8. a cylinder; 9. a valve block; 10. a pipe wall ring; 11. an aluminum gas pipe; 12. a buffer ring 13; 14. a pipe wall ring; 15. a rear cover; 16. a piston rod; 17. a piston front cover; 18. a piston ring; 19. an axle center ring; 20. an inner piston; 21. an axle center ring; 22. a piston ring; 23. an inner piston cylinder; 24. a piston rear cover.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples: the weak sliding cylinder shown by referring to figures 1-4 comprises a cylinder barrel 8, a rear cover 15 is arranged on one side part of the cylinder barrel 8 through a first temperature resistant mechanism, a front cover 5 is arranged on the other side part of the cylinder barrel 8 through a second temperature resistant mechanism, a dustproof cover plate 1 is arranged on the side part of the front cover 5 far away from the cylinder barrel 8 through a guide mechanism, a valve block 9 is arranged at the top of the cylinder barrel 8, two aluminum air pipes 11 are arranged on the side part of the valve block 9, the two aluminum air pipes 11 are connected with the rear cover 15, a third temperature resistant mechanism is arranged at two ends of the aluminum air pipes 11, through holes are arranged on the rear cover 15, the through holes are communicated with the cylinder barrel 8 and the aluminum air pipes 11, two pressure regulating valves 3 and inlet and outlet joint interfaces are arranged on the front cover 5 and the valve block 9, the inlet and outlet joint interfaces on the valve block 9 are communicated with the cylinder barrel 8, an inner piston cylinder 23 is arranged in the cylinder barrel 8, the piston front cover 17 and the piston rear cover 24 are respectively installed at two ends of the inner piston cylinder 23, first air holes are formed in the side part, close to the inner piston cylinder 23, of the piston front cover 17 and the circumferential side part, second air holes are formed in the side part, far away from the inner piston cylinder 23, of the piston rear cover 24, the inner piston cylinder 23 is installed in a matched mode with the inner wall of the cylinder barrel 8 through two fourth temperature resistant mechanisms, the two fourth temperature resistant mechanisms are respectively close to the piston rear cover 24 and the piston front cover 17, a piston rod 16 is installed in the inner piston cylinder 23 in a sliding mode, an inner piston 20 is installed at one end, located by the piston rod 16, of the inner piston cylinder 23, a first axial center ring 21 and a first piston ring 22 are installed on the inner piston 20, the first axial center ring 21, the first piston ring 22 and the inner wall of the inner piston cylinder 23 are connected in a sliding mode, and the other end of the piston rod 16 penetrates through the piston front cover 17, the front cover 5 and the dustproof cover plate 1 in sequence.
By the above structure: the cylinder is fixed at a position required by a designer, the reversing valve and other air-receiving pipe joints are used for connecting air inlet and outlet ports of the front end cover and the rear end cover, the reversing valve is used for switching the reciprocating motion of the cylinder, when the piston rod 16 drives the inner piston cylinder 23, the piston front cover 17 and the piston rear cover 24 to respectively touch the third buffer ring 7 and the first buffer ring 13, the inner piston 20 starts to move, air is discharged through the first air hole and the second air hole, the reaction force enables the cylinder to start to slow down and buffer, the two pressure regulating valves 3 are respectively twisted, and the moving speed and the buffering speed of the cylinder can be adjusted.
The pore diameters of the first pore and the second pore are 0.6mm. The original phi 1 of the air hole is changed into a pin hole phi 0.6, and the air of the inner piston cylinder can only be discharged through the pin hole. The smaller holes can enable the buffering effect of the gas to be more obvious and easy to control, when the pressure in the cavity rises rapidly, the pressure generates a reaction force to the piston, so that the piston is decelerated until stopping, the gas cylinder capable of moving rapidly can have an obvious buffering effect, and the air cylinder is controlled to be discharged by adjusting the pressure regulating valve to control the buffering speed.
The first temperature-resistant mechanism comprises a first buffer ring 13, a second buffer ring 12 and a first pipe wall ring 14, wherein the second buffer ring 12, the first buffer ring 13 and the first pipe wall ring 14 are sequentially arranged along the direction from the cylinder barrel 8 to the rear cover 15, a first connecting pipe communicated with a through hole is arranged on the side part of the rear cover 15, the first connecting pipe extends into the cylinder barrel 8, the first pipe wall ring 14 is sleeved on the first connecting pipe, the first buffer ring 13 is arranged on the side part of the first connecting pipe, the second buffer ring 12 is arranged on the side part of the first buffer ring 13, and the first pipe wall ring 14 is in contact with the cylinder barrel 8. By the provision of the first temperature resistant mechanism, the rear cover 15 and the cylinder tube 8 can be sealed.
The second temperature-resistant mechanism comprises a second pipe wall ring 6 and a third buffer ring 7, the side part of the front cover 5 is provided with a mounting hole, a second connecting pipe is arranged in the mounting hole, one end of the second connecting pipe extends into the cylinder 8, the second pipe wall ring 6 is sleeved on the second connecting pipe, the third buffer ring 7 is arranged on the side part, close to the cylinder 8, of the second connecting pipe, and the side part of the second pipe wall ring 6 is in contact with the cylinder 8. By the arrangement of the second temperature resistant mechanism, the front cover 5 and the cylinder tube 8 can be sealed.
The third temperature-resistant mechanism comprises two third pipe wall rings 10, wherein the two third pipe wall rings 10 are respectively arranged at the end parts of the two aluminum air pipes 11, and the two third pipe wall rings 10 are used for sealing the two aluminum air pipes 11, the valve block 9 or the two aluminum air pipes 11 and the rear cover 15. By the arrangement of the third pipe wall ring 10, both ends of the two aluminum air pipes 11 are sealed.
The second pipe wall ring 6, the third buffer ring 7, the third pipe wall ring 10, the second buffer ring 12, the first buffer ring 13 and the first pipe wall ring 14 are all O-shaped, the second pipe wall ring 6, the third buffer ring 7, the third pipe wall ring 10, the second buffer ring 12, the first buffer ring 13 and the first pipe wall ring 14 are hydrogenated nitrile rubber rings, and the second pipe wall ring 6, the third buffer ring 7, the third pipe wall ring 10, the second buffer ring 12, the first buffer ring 13 and the first pipe wall ring 14 are all provided with pits. The second pipe wall ring 6, the third buffer ring 7, the third pipe wall ring 10, the second buffer ring 12, the first buffer ring 13 and the first pipe wall ring 14 are designed to be in a concave state, so that the sealing element can be firmly embedded into the pipe wall ring without deformation, the concave depth is designed to enable the sealing element to be higher than a mounting surface by 0.2mm when being mounted, the hydrogenated nitrile-butadiene rubber has more excellent wear resistance and compression deformation resistance than the traditional nitrile-butadiene rubber, the cold resistance can reach-50 ℃, the soft sealing structure is easy to ensure unsealing, complete sealing can be realized, and the valve sealing capacity is increased along with the increase of medium pressure.
The guiding mechanism comprises a copper sleeve 4 arranged in a second connecting pipe, a dust-proof ring 2 is arranged on the side part of the copper sleeve 4, the dust-proof ring 2 is matched with the dust-proof cover plate 1, one end of a piston rod 16 sequentially penetrates through the copper sleeve 4 and the dust-proof ring 2, and the copper sleeve 4 is a graphite copper sleeve. Through being provided with copper sheathing 4, can lead when piston rod 16 reciprocating motion, improve the direction precision of cylinder, bear a small amount of transverse load on the piston rod 16, the camber that falls when reducing piston rod 16 and stretching out, extension cylinder life, graphite copper sheathing can play a lubricated effect for the piston rod, can also reduce the vibrations of machinery to reduce noise, improve the direction precision, increase of service life.
The fourth temperature-resistant mechanism comprises a second piston ring 18 and a second piston ring 19, the second piston ring 18 and the second piston ring 19 are sleeved on the inner piston cylinder 23, the second piston ring 18 and the second piston ring 19 are in contact with the inner wall of the cylinder 8, the second piston ring 18 and the first piston ring 22 are polytetrafluoroethylene rings, and the second piston ring 19 and the first piston ring 21 are fluorine rubber rings. The polytetrafluoroethylene ring has excellent wear resistance and cold resistance at-100 ℃, the guiding performance and the sealing performance of the piston are improved through the axle center ring, the piston rod is prevented from shaking, the piston rod is kept from sagging when the piston rod is completely extended, and the fluorine rubber ring has excellent wear resistance and deformation resistance and can adapt to shaking compensation during high-speed reciprocating operation and cylinder movement.
The working principle of the utility model is as follows:
the cylinder is fixed at a position required by a designer, a gas receiving pipe joint such as a reversing valve is used for connecting gas inlet and outlet joints of a front end cover and a rear end cover, the reversing valve is used for switching the reciprocating motion of the cylinder, when the piston rod 16 drives the inner piston cylinder 23, the piston front cover 17 and the piston rear cover 24 to respectively touch the third buffer ring 7 and the first buffer ring 13, the inner piston 20 starts to move, gas is discharged through the first air hole and the second air hole, the reaction force enables the cylinder to start to slow down and buffer, the two pressure regulating valves 3 are respectively twisted, the moving speed and the buffer speed of the cylinder can be regulated, the cylinder can be used after the normal operation and no gas leakage phenomenon under no-load test operation and the maximum working pressure of 1.5 times, the buffer cylinder is twisted at a position with smaller throttling quantity before starting to operate, and then the buffer cylinder is gradually opened until the buffer effect is regulated to be satisfactory, the use of the air source is required to ensure that the air is dry and free of pollutants, and the service life of the air source can be prolonged.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present utility model can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (8)
1. The utility model provides a weak pneumatic cylinder, includes cylinder (8), its characterized in that: a rear cover (15) is arranged at one side part of the cylinder barrel (8) through a first temperature-resistant mechanism, a front cover (5) is arranged at the other side part of the cylinder barrel (8) through a second temperature-resistant mechanism, a dustproof cover plate (1) is arranged at the side part of the front cover (5) away from the cylinder barrel (8) through a guide mechanism, a valve block (9) is arranged at the top of the cylinder barrel (8), two aluminum air pipes (11) are arranged at the side part of the valve block (9), the two aluminum air pipes (11) are connected with the rear cover (15), third temperature-resistant mechanisms are arranged at two ends of the aluminum air pipes (11), through holes are formed in the rear cover (15), the through holes are communicated with the cylinder barrel (8) and the aluminum air pipes (11), two pressure regulating valves (3) and inlet and outlet joint interfaces are arranged on the valve block (9), the joint interfaces are communicated with the two aluminum air pipes (11), the front cover (5) is arranged at the inlet and outlet joint interfaces (23) of the piston (8), the piston (23) are respectively arranged in the piston (8), the piston front cover (17) is close to the side part and the circumference side part of the inner piston cylinder (23), the piston rear cover (24) is far away from the side part of the inner piston cylinder (23) and is provided with a second air hole, the inner piston cylinder (23) is matched and installed with the inner wall of the cylinder barrel (8) through two fourth temperature resistant mechanisms, the two fourth temperature resistant mechanisms are respectively close to the piston rear cover (24) and the piston front cover (17), a piston rod (16) is slidably installed in the inner piston cylinder (23), the piston rod (16) is located at one end of the inner piston cylinder (23), an inner piston (20) is installed on the inner piston (20), a first axial center ring (21) and a first piston ring (22) are installed on the inner piston (20), the first axial center ring (22) is in sliding connection with the inner wall of the inner piston cylinder (23), and the other end of the piston rod (16) sequentially penetrates through the piston front cover (17), the front cover (5) and the dust-proof cover plate (1).
2. The weakly actuated cylinder of claim 1 wherein: the aperture of the first air hole and the second air hole is 0.6mm.
3. The weakly actuated cylinder of claim 1 wherein: the first temperature-resistant mechanism comprises a first buffer ring (13), a second buffer ring (12) and a first pipe wall ring (14), wherein the second buffer ring (12), the first buffer ring (13) and the first pipe wall ring (14) are sequentially arranged along the cylinder barrel (8) to the rear cover (15), a first connecting pipe communicated with the through hole is arranged on the side portion of the rear cover (15), the first connecting pipe extends into the cylinder barrel (8), the first pipe wall ring (14) is sleeved on the first connecting pipe, the first buffer ring (13) is arranged on the side portion of the first connecting pipe, the second buffer ring (12) is arranged on the side portion of the first buffer ring (13), and the first pipe wall ring (14) is in contact with the cylinder barrel (8).
4. A weakly actuated cylinder as claimed in claim 3 wherein: the second temperature-resistant mechanism comprises a second pipe wall ring (6) and a third buffer ring (7), wherein a mounting hole is formed in the side part of the front cover (5), a second connecting pipe is installed in the mounting hole, one end of the second connecting pipe extends to the cylinder barrel (8), the second pipe wall ring (6) is sleeved on the second connecting pipe, the third buffer ring (7) is installed on the side part, close to the cylinder barrel (8), of the second connecting pipe, and the side part of the second pipe wall ring (6) is in contact with the cylinder barrel (8).
5. The weakly actuated cylinder of claim 4 wherein: the third temperature-resistant mechanism comprises two third pipe wall rings (10), the two third pipe wall rings (10) are respectively arranged at the end parts of the two aluminum air pipes (11), and the two third pipe wall rings (10) are used for sealing the two aluminum air pipes (11), the valve block (9) or the two aluminum air pipes (11) and the rear cover (15).
6. The weakly actuated cylinder of claim 5 wherein: the second pipe wall ring (6), the third buffer ring (7), the third pipe wall ring (10), the second buffer ring (12), the first buffer ring (13) and the first pipe wall ring (14) are O-shaped, the second pipe wall ring (6), the third buffer ring (7), the third pipe wall ring (10), the second buffer ring (12), the first buffer ring (13) and the first pipe wall ring (14) are hydrogenated nitrile rubber rings, the second pipe wall ring (6), the third buffer ring (7), the third pipe wall ring (10), the second buffer ring (12), the first buffer ring (13) and the first pipe wall ring (14) are all provided with recesses.
7. The weakly actuated cylinder of claim 4 wherein: the guiding mechanism comprises a copper sleeve (4) arranged in the second connecting pipe, a dustproof ring (2) is arranged on the side portion of the copper sleeve (4), the dustproof ring (2) is matched with the dustproof cover plate (1), one end of the piston rod (16) sequentially penetrates through the copper sleeve (4) and the dustproof ring (2), and the copper sleeve (4) is a graphite copper sleeve.
8. The weakly actuated cylinder of claim 1 wherein: the fourth temperature-resistant mechanism comprises a second piston ring (18) and a second piston ring (19), the second piston ring (18) and the second piston ring (19) are sleeved on the inner piston cylinder (23), the second piston ring (18) and the second piston ring (19) are in contact with the inner wall of the cylinder barrel (8), the second piston ring (18) and the first piston ring (22) are polytetrafluoroethylene rings, and the second piston ring (19) and the first piston ring (21) are fluorine rubber rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320269581.3U CN219366458U (en) | 2023-02-18 | 2023-02-18 | Weak-power air cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320269581.3U CN219366458U (en) | 2023-02-18 | 2023-02-18 | Weak-power air cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219366458U true CN219366458U (en) | 2023-07-18 |
Family
ID=87115959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320269581.3U Active CN219366458U (en) | 2023-02-18 | 2023-02-18 | Weak-power air cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219366458U (en) |
-
2023
- 2023-02-18 CN CN202320269581.3U patent/CN219366458U/en active Active
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