CN114016842A - Door closer-based external protection plate with reinforced sealing structure - Google Patents
Door closer-based external protection plate with reinforced sealing structure Download PDFInfo
- Publication number
- CN114016842A CN114016842A CN202111329088.8A CN202111329088A CN114016842A CN 114016842 A CN114016842 A CN 114016842A CN 202111329088 A CN202111329088 A CN 202111329088A CN 114016842 A CN114016842 A CN 114016842A
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- Prior art keywords
- plate
- door closer
- block
- protection plate
- inboard
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- 238000007789 sealing Methods 0.000 title claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 24
- 230000001012 protector Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims 8
- 239000000463 material Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002337 anti-port Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
- E05F3/22—Additional arrangements for closers, e.g. for holding the wing in opened or other position
- E05F3/225—Additional arrangements for closers, e.g. for holding the wing in opened or other position mounted at the bottom of wings, e.g. details related to seals, covers, connections to the wings, embedding in the floor
Abstract
The invention relates to the technical field of door closers, in particular to an external protection plate with a reinforced sealing structure based on a door closer, which comprises a protection plate, a sealing protection device, a drying device and a stable connecting device, wherein the sealing protection device is arranged at the central position of the inner side of the protection plate and comprises a sealing block, the central position of the inner side of the protection plate is provided with the sealing block, the edge of the inner side of the sealing block is connected with a limiting column in a sliding way, and the limiting column is fixedly connected with the protection plate, in the invention, through the arranged sealing block, the limiting column and a bolt, when the device is used, the sealing block made of rubber is sleeved at the outer side of the limiting column, then the limiting is carried out through the bolt, and the sliding surface of a plunger can be shielded and protected under the condition that the sliding of the plunger is not influenced by the characteristic of good elasticity of the rubber, so that the phenomenon of friction increase between internal components caused by the entering of dust foreign matters into the door closer is avoided to the greatest extent, the service life of the door closer is ensured.
Description
Technical Field
The invention relates to the technical field of door closers, in particular to an external protection plate with a reinforced sealing structure for a door closer.
Background
The door closer is a hydraulic press similar to a spring on the door head, the door can be released after being compressed after being opened, the door is automatically closed, the door has the effect like a spring door, the door can be ensured to be opened, the door is accurately and timely closed to the initial position, the modern hydraulic door closer starts from a patent registered by the American people in the early stage of the twentieth century, the door closer is different from the traditional door closer, the buffering effect is achieved by throttling liquid in the door closer, the core of the design idea of the hydraulic door closer lies in realizing the control of the door closing process, various functional indexes of the door closing process can be adjusted according to the needs of people, and the working principle of the door closer is as follows: when the door is opened, the door body drives the connecting rod to act and enables the transmission gear to rotate, the rack plunger is driven to move towards the right, the spring is compressed in the process that the plunger moves towards the right, hydraulic oil in the right cavity is also compressed, the check valve ball on the left side of the plunger is opened under the action of oil pressure, the hydraulic oil in the right cavity flows into the left cavity through the check valve, after the door opening process is completed, the accumulated elastic potential energy is released due to the compression of the spring in the opening process, the plunger is pushed towards the left side to drive the transmission gear and the door closer connecting rod to rotate, so that the door is closed, along with the continuous development of the society, the door closer is applied more and more, the types of the door closer are more and more, but when part of the door closer is used, the sliding surface of the plunger cannot be well shielded and protected, so that the phenomenon that dust and foreign matters enter the door closer easily occurs, and the friction of internal components is increased, the service life of the door closer is shortened, and the drying of the interior of the door closer cannot be well guaranteed, so that the phenomenon of rusting caused by the fact that the interior is wet is easy to occur, the friction of the interior can be increased, and the service life of the door closer is shortened.
Disclosure of Invention
The invention aims to provide an external protection plate with a reinforced sealing structure for a door closer, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an adorn guard plate outward with having and strengthen seal structure based on door closer, includes guard plate, sealed protector, drying device and stable connecting device, the inboard central point of guard plate puts and is equipped with sealed protector, sealed protector includes sealed piece, the inboard central point of guard plate puts and is equipped with sealed piece, the inboard edge sliding connection of sealed piece has spacing post, and spacing post and guard plate fixed connection, the inboard bottom screwed connection of spacing post has the bolt, and bolt and sealed piece contact, both ends all are equipped with drying device about the guard plate inboard, the guard plate top left and right sides all is equipped with stable connecting device.
Preferably, the sealing block is made of a rubber plate, and the sealing block penetrates through the protection plate.
Preferably, there are 6 spacing posts, and spacing post symmetry sets up at sealed piece inboard.
Preferably, drying device includes the fixed plate, the equal sliding connection in both ends has the fixed plate about the guard plate is inboard, the inboard top of fixed plate is equipped with dry filter screen, the first spring of the inboard bottom fixedly connected with of fixed plate, the other end fixedly connected with ejector pad of first spring, and ejector pad and fixed plate sliding connection, fixed plate outside fixedly connected with fixture block.
Preferably, the limiting groove is formed in the outer side of the drying filter screen, a limiting ring is arranged on the inner side of the limiting groove in the outer side of the drying filter screen and is fixedly connected with the fixing plate, and the limiting ring is made of a rubber plate.
Preferably, the fixture block runs through the fixed plate, and the fixture block is connected with the fixed plate and the protection plate in a sliding mode, and the top end of the fixture block is arranged in an inclined plane.
Preferably, both ends are all rotated and are connected with first threaded shaft about the guard plate outside, and first threaded shaft runs through the guard plate, first threaded shaft outside screwed connection has the baffle, and baffle and guard plate sliding connection, the baffle contacts with dry filter screen.
Preferably, stabilize connecting device and include the connecting block, the equal sliding connection in guard plate top left and right sides has the connecting block, connecting block outside fixedly connected with second spring, and the other end and the guard plate fixed connection of second spring, the connecting block top is rotated and is connected with second screw thread axle, and second screw thread axle through connection piece, second screw thread axle outside spiral connection has the slider, and slider and connecting block sliding connection, the inboard sliding connection of slider has the stopper, stopper outside sliding connection has spacing seat, and spacing seat and door closer fixed connection.
Preferably, the top end of the limiting block is fixedly connected with a third spring, and the other end of the third spring is fixedly connected with the sliding block.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the sealing block, the limiting column and the bolt, when the device is used, the sealing block made of rubber is sleeved on the outer side of the limiting column, then the limiting is carried out through the bolt, and the sliding surface of the plunger can be shielded and protected under the condition of not influencing the sliding of the plunger by matching with the characteristic of good elasticity of the rubber, so that the phenomenon of friction increase between internal components caused by the fact that dust and foreign matters enter the door closer is avoided to the greatest extent, and the service life of the door closer is ensured;
2. according to the door closer, the drying filter screen is limited at the inner side of the protection plate by matching the elasticity of the first spring to the push block and the clamping of the clamping block and the protection plate when the device is used, the bottom of the door closer is opened by rotating the first threaded shaft, and the drying inside the door closer is ensured, so that the phenomenon of friction increase among components caused by moisture and rustiness inside the door closer is avoided to the maximum extent, and the service life of the door closer is ensured;
3. according to the invention, through the arrangement of the limiting block, the second threaded shaft and the second spring, when the device is used, the limiting block and the limiting seat are clamped together by matching with the elastic force of the second spring on the connecting block, and the second threaded shaft is rotated to continuously control the sliding block to move downwards, so that the limiting block continuously compresses the third spring, the mounting of the protection plate is facilitated, the operation is simple and convenient, and the stability of the protection plate after the mounting is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic overall sectional view of the seal guard of the present invention;
FIG. 3 is a schematic cross-sectional view of a fixing plate according to the present invention;
FIG. 4 is a schematic top view of the fender panel of the present invention;
fig. 5 is a schematic bottom view of the protection plate of the present invention.
In the figure: the device comprises a 1-protection plate, a 2-sealing protection device, a 201-sealing block, a 202-limiting column, a 203-bolt, a 3-drying device, a 301-fixing plate, a 302-drying filter screen, a 303-limiting ring, a 304-pushing block, a 305-clamping block, a 306-first spring, a 307-baffle, a 308-first threaded shaft, a 4-stable connecting device, a 401-connecting block, a 402-second spring, a 403-sliding block, a 404-second threaded shaft, a 405-limiting block, a 406-third spring and a 407-limiting seat.
Detailed Description
Example 1:
referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the present invention provides a technical solution:
an exterior protection plate with a reinforced sealing structure based on a door closer comprises a protection plate 1, a sealing protection device 2, a drying device 3 and a stable connection device 4, wherein the sealing protection device 2 is arranged at the central position of the inner side of the protection plate 1, the sealing protection device 2 comprises a sealing block 201, the sealing block 201 is made of a rubber plate, the sealing block 201 penetrates through the protection plate 1, the door closer has a better sealing protection effect due to the arrangement, the sealing block 201 is arranged at the central position of the inner side of the protection plate 1, a limiting column 202 is connected to the edge of the inner side of the sealing block 201 in a sliding mode, the limiting column 202 is fixedly connected with the protection plate 1, 6 limiting columns 202 are arranged, the limiting columns 202 are symmetrically arranged on the inner side of the sealing block 201, the arrangement ensures the stability of the sealing block 201 after installation, a bolt 203 is spirally connected to the bottom end of the inner side of the limiting column 201, and the bolt 203 is in contact with the sealing block 201, when the device is used, the sliding surface of the plunger can be shielded and protected under the condition that the sliding of the plunger is not influenced, so that the phenomenon of friction increase between internal components caused by dust foreign matters entering the door closer is avoided to the maximum extent, the service life of the door closer is ensured, the left end and the right end of the inner side of the protection plate 1 are respectively provided with the drying device 3, the drying device 3 comprises a fixing plate 301, the left end and the right end of the inner side of the protection plate 1 are respectively connected with the fixing plate 301 in a sliding manner, the top end of the inner side of the fixing plate 301 is provided with the drying filter screen 302, the outer side of the drying filter screen 302 is provided with the limiting groove, the inner side of the limiting groove at the outer side of the drying filter screen 302 is provided with the limiting ring 303, the limiting ring 303 is fixedly connected with the fixing plate 301, the limiting ring 303 is made of a rubber plate, the arrangement is convenient for the connection between the drying filter screen 302 and the fixing plate 301, and the bottom end of the inner side of the fixing plate 301 is fixedly connected with the first spring 306, the other end of the first spring 306 is fixedly connected with a push block 304, the push block 304 is slidably connected with the fixed plate 301, the outer side of the fixed plate 301 is fixedly connected with a fixture block 305, the fixture block 305 penetrates through the fixed plate 301, the fixture block 305 is slidably connected with the fixed plate 301 and the protection plate 1, the top end of the fixture block 305 is arranged in an inclined plane, the arrangement facilitates the rapid installation of the fixed plate 301, the operation is simple and convenient, thereby facilitating the rapid installation of the dry filter screen 302, the left end and the right end of the outer side of the protection plate 1 are rotatably connected with a first threaded shaft 308, the first threaded shaft 308 penetrates through the protection plate 1, the outer side of the first threaded shaft 308 is spirally connected with a baffle 307, the baffle 307 is slidably connected with the protection plate 1, the baffle 307 is contacted with the dry filter screen 302, when the dry filter screen 302 is replaced, external moist gas is prevented from entering the device, and the arrangement ensures the drying inside the door closer, thereby avoiding the phenomenon of friction increase between components caused by moisture and rust in the door closer to the maximum extent and ensuring the service life of the door closer, the left side and the right side of the top end of the protection plate 1 are both provided with the stable connection device 4, the stable connection device 4 comprises a connection block 401, the left side and the right side of the top end of the protection plate 1 are both connected with the connection block 401 in a sliding way, the outer side of the connection block 401 is fixedly connected with a second spring 402, the other end of the second spring 402 is fixedly connected with the protection plate 1, the top end of the connection block 401 is connected with a second threaded shaft 404 in a rotating way, the second threaded shaft 404 penetrates through the connection block 401, the outer side of the second threaded shaft 404 is spirally connected with a slide block 403, the slide block 403 is connected with the connection block 401 in a sliding way, the inner side of the slide block 403 is connected with a limit seat 407 in a sliding way, the top end of the limit block 405 is fixedly connected with a third spring 406, and the other end of the third spring 406 is fixedly connected with the slide block 403, the setting makes the stability of guard plate 1 after installation better, and spacing seat 407 and door closer fixed connection, and this kind of setting has made things convenient for the installation of guard plate 1, and easy operation is convenient, and has guaranteed the stability of guard plate 1 after the installation.
The working process is as follows: when the device is used, the sealing block 201 is inserted into the center of the inner side of the protection plate 1, the sealing block 201 is ensured to be sleeved outside the six limiting posts 202, then the screw connection of the bolts 203 and the limiting posts 202 is matched to position the sealing block 201, then the dry filter screen 302 is placed into the inner side of the fixing plate 301, because the outer side of the dry filter screen 302 is provided with the limiting groove, and the inner side of the fixing plate 301 is fixed with the rubber limiting ring 303, the dry filter screen 302 can be stably limited at the inner side of the fixing plate 301, then the fixing plate 301 is inserted into the left end and the right end of the inner side of the protection plate 1 from the bottom of the protection plate 1, at the moment, the fixture block 305 can continuously push the push block 304 to compress the first spring 306, when the fixture block 305 is clamped with the protection plate 1 after being reset, the installation of the dry filter screen 302 is completed at the moment, then the connecting block 401 is pushed to compress the second spring 402, and then the door closer is placed at the top end of the protection plate 1, the sliding plunger in the door closer is ensured to penetrate through the sealing block 201 made of rubber, then the pushing of the connecting block 401 is loosened to enable the limiting block 405 to be clamped into the limiting seat 407 fixed on the outer side of the door closer, finally the second threaded shaft 404 is rotated, the sliding block 403 can slide downwards continuously at the moment, when the bottom end of the limiting block 405 is contacted with the limiting seat 407, the second threaded shaft 404 is continuously rotated, at the moment, the third spring 406 can be continuously compressed, when the second threaded shaft 404 cannot rotate, the stable connection between the protection plate 1 and the door closer is completed at the moment, finally, the device can be used after the door closer is installed, at the moment, when the plunger in the door closer slides, the sealing block 201 made of rubber can be continuously deformed and reset, thereby the sealing and protecting effects are well played, meanwhile, the drying and dehumidifying effects can be continuously performed on the interior of the door closer by the drying filter screen 302, thereby avoiding the rusting phenomenon caused by the humidity in the interior of the door closer, guaranteed the life of door closer, because dry filter screen 302 is the consumable article, so will change regularly, during the change, first screw shaft 308 of antiport, the closed baffle 307 that resets earlier, then promote ejector pad 304 compression first spring 306 and make fixture block 305 not together with guard plate 1 card, take out dry filter screen 302 after that and change it can, easy operation is convenient.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but a few objective structures due to the limited character expressions, and that those skilled in the art may make various improvements, decorations or changes without departing from the principle of the invention or may combine the above technical features in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (9)
1. The utility model provides an adorn guard plate outward with having reinforced seal structure based on door closer, includes guard plate (1), sealed protector (2), drying device (3) and stabilizes connecting device (4), its characterized in that: protection plate (1) inboard central point puts and is equipped with sealed protector (2), sealed protector (2) are including sealed piece (201), protection plate (1) inboard central point puts and is equipped with sealed piece (201), sealed piece (201) inboard edge sliding connection has spacing post (202), and spacing post (202) and protection plate (1) fixed connection, spacing post (201) inboard bottom threaded connection has bolt (203), and bolt (203) and sealed piece (201) contact, both ends all are equipped with drying device (3) about protection plate (1) inboard, protection plate (1) top left and right sides all is equipped with stable connecting device (4).
2. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 1, wherein: the sealing block (201) is made of a rubber plate, and the sealing block (201) penetrates through the protection plate (1).
3. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 1, wherein: the number of the limiting columns (202) is 6, and the limiting columns (202) are symmetrically arranged on the inner side of the sealing block (201).
4. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 1, wherein: drying device (3) are including fixed plate (301), the equal sliding connection in both ends has fixed plate (301) about guard plate (1) inboard, fixed plate (301) inboard top is equipped with dry filter screen (302), the first spring of fixed plate (301) inboard bottom fixedly connected with (306), the other end fixedly connected with ejector pad (304) of first spring (306), and ejector pad (304) and fixed plate (301) sliding connection, fixed plate (301) outside fixedly connected with fixture block (305).
5. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 4, wherein: the limiting groove has been seted up in dry filter screen (302) outside, the limiting groove inboard in dry filter screen (302) outside is equipped with spacing ring (303), and spacing ring (303) and fixed plate (301) fixed connection, spacing ring (303) are made by the panel of rubber material.
6. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 4, wherein: the fixture block (305) penetrates through the fixing plate (301), the fixture block (305) is connected with the fixing plate (301) and the protection plate (1) in a sliding mode, and the top end of the fixture block (305) is arranged in an inclined plane.
7. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 4, wherein: both ends are all rotated and are connected with first threaded shaft (308) about guard plate (1) outside, and first threaded shaft (308) run through guard plate (1), first threaded shaft (308) outside threaded connection has baffle (307), and baffle (307) and guard plate (1) sliding connection, baffle (307) and dry filter screen (302) contact.
8. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 1, wherein: stabilize connecting device (4) and include connecting block (401), the equal sliding connection in guard plate (1) top left and right sides has connecting block (401), connecting block (401) outside fixedly connected with second spring (402), and the other end and guard plate (1) fixed connection of second spring (402), connecting block (401) top is rotated and is connected with second threaded shaft (404), and second threaded shaft (404) through connection piece (401), second threaded shaft (404) outside spiral connection has slider (403), and slider (403) and connecting block (401) sliding connection, slider (403) inboard sliding connection has stopper (405), stopper (405) outside sliding connection has spacing seat (407), and spacing seat (407) and door closer fixed connection.
9. The exterior protective plate with the reinforced sealing structure for the door closer according to claim 8, wherein: the top end of the limiting block (405) is fixedly connected with a third spring (406), and the other end of the third spring (406) is fixedly connected with the sliding block (403).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329088.8A CN114016842B (en) | 2021-11-10 | 2021-11-10 | Outer-mounted protection plate with reinforced sealing structure based on door closer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329088.8A CN114016842B (en) | 2021-11-10 | 2021-11-10 | Outer-mounted protection plate with reinforced sealing structure based on door closer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114016842A true CN114016842A (en) | 2022-02-08 |
| CN114016842B CN114016842B (en) | 2023-12-22 |
Family
ID=80063177
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111329088.8A Active CN114016842B (en) | 2021-11-10 | 2021-11-10 | Outer-mounted protection plate with reinforced sealing structure based on door closer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114016842B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9100826U1 (en) * | 1990-01-31 | 1991-06-27 | Sut-Sicherheit, Umwelt Und Technik Gmbh, 3380 Goslar, De | |
| KR101627692B1 (en) * | 2015-04-01 | 2016-06-07 | 주식회사 성신테크 | Sliding automatic door seal |
| CN205477053U (en) * | 2016-03-30 | 2016-08-17 | 珠海保税区茵科舒尔特门控科技有限公司 | Door closer piston with filtering capability |
| CN206625713U (en) * | 2017-03-20 | 2017-11-10 | 王朝琦 | The door closer-holder of anticollision |
| CN108104690A (en) * | 2017-11-24 | 2018-06-01 | 江苏中特防火门有限公司 | fire-proof wooden door and its manufacturing process |
| CN209248622U (en) * | 2019-02-15 | 2019-08-13 | 苏州东部信息技术有限公司 | A kind of intelligent entrance guard access card corresponding groove |
| CN210141068U (en) * | 2019-03-22 | 2020-03-13 | 温州欧德门控科技发展有限公司 | Door closer piston |
-
2021
- 2021-11-10 CN CN202111329088.8A patent/CN114016842B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9100826U1 (en) * | 1990-01-31 | 1991-06-27 | Sut-Sicherheit, Umwelt Und Technik Gmbh, 3380 Goslar, De | |
| KR101627692B1 (en) * | 2015-04-01 | 2016-06-07 | 주식회사 성신테크 | Sliding automatic door seal |
| CN205477053U (en) * | 2016-03-30 | 2016-08-17 | 珠海保税区茵科舒尔特门控科技有限公司 | Door closer piston with filtering capability |
| CN206625713U (en) * | 2017-03-20 | 2017-11-10 | 王朝琦 | The door closer-holder of anticollision |
| CN108104690A (en) * | 2017-11-24 | 2018-06-01 | 江苏中特防火门有限公司 | fire-proof wooden door and its manufacturing process |
| CN209248622U (en) * | 2019-02-15 | 2019-08-13 | 苏州东部信息技术有限公司 | A kind of intelligent entrance guard access card corresponding groove |
| CN210141068U (en) * | 2019-03-22 | 2020-03-13 | 温州欧德门控科技发展有限公司 | Door closer piston |
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| Publication number | Publication date |
|---|---|
| CN114016842B (en) | 2023-12-22 |
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