CN114700694A - Production process of pneumatic door closer - Google Patents
Production process of pneumatic door closer Download PDFInfo
- Publication number
- CN114700694A CN114700694A CN202210375690.3A CN202210375690A CN114700694A CN 114700694 A CN114700694 A CN 114700694A CN 202210375690 A CN202210375690 A CN 202210375690A CN 114700694 A CN114700694 A CN 114700694A
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- Prior art keywords
- steel pipe
- tail
- door closer
- damping
- production process
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 143
- 239000010959 steel Substances 0.000 claims abstract description 143
- 238000013016 damping Methods 0.000 claims abstract description 57
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 239000000047 product Substances 0.000 claims abstract description 23
- 239000004519 grease Substances 0.000 claims abstract description 14
- 230000001050 lubricating effect Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 239000012466 permeate Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 239000012467 final product Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- E05F3/02—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with pneumatic piston brakes
Abstract
The invention provides a production process of a pneumatic door closer, which solves the problem that the quality of a product is influenced because the existing production process is not optimized. The production process mainly comprises the steps of processing a steel pipe; pressing in a gear sleeve; a clamping groove of the gear pressing sleeve; loading the inner part; assembling a gasket and a welding plate; filling damping lubricating grease; assembling a piston member; sealing the tail; and (4) sequential steps of inflation. The production process disclosed by the invention is simple to operate, and compared with the prior art, the steps are more reasonably optimized, so that the quality of the final product is effectively ensured.
Description
Technical Field
The invention relates to the technical field of pneumatic door closer production, in particular to a production process of a pneumatic door closer.
Background
A floor spring and a door closer are automatic return door closing devices commonly used in the current market, when the pneumatic rotary damping device is used, a door or a window rotates to compress an internal closed air chamber, and air pressure in the air chamber is released when the door or the window returns. However, the production steps of the conventional device are complicated, and part of processes are still not optimized enough, so that the quality of the product is influenced to a certain degree.
Disclosure of Invention
The invention provides a production process of a pneumatic door closer, which solves the problem that the existing production process is not optimized enough to influence the product quality.
The technical scheme of the invention is realized as follows: the production process of the pneumatic door closer comprises the following sequential steps
S1, processing a steel pipe; chamfering and cleaning pretreatment are carried out on the steel pipe;
s2, pressing in a gear sleeve; pressing a gear sleeve in interference fit with the steel pipe into the steel pipe;
s3, pressing a tooth sleeve clamping groove; pressing a groove at the position corresponding to the groove of the gear sleeve outside the steel pipe to prevent the gear sleeve from rotating in the steel pipe;
s4, loading an inner part; the inner part is arranged in the gear sleeve according to the identification direction;
s5, assembling a gasket and a welding plate; installing a gasket and a welding plate matched with the inner part at the end part of the steel pipe, and welding and fixing the welding plate and the steel pipe to realize the sealing of the end part of the steel pipe;
s6, filling damping lubricating grease; inverting the steel pipe with the closed end down, and injecting damping grease which has a lubricating effect on the inner parts into the steel pipe;
s7, assembling a piston piece; a piston piece is arranged in the steel pipe;
s8, sealing the tail; sealing the end of the steel pipe;
s9, inflating; and (3) placing the steel pipe with the sealed tail in a high-pressure nitrogen environment, and increasing the air pressure to enable the nitrogen to permeate into the steel pipe from the sealed tail.
After the technical scheme is adopted, the invention has the beneficial effects that: the invention firstly carries out pretreatment such as chamfering, cleaning and the like on the steel pipe to ensure that the quality of the steel pipe meets the requirements; the gear sleeve in interference fit with the steel pipe is selected to prevent the gear sleeve from displacing in the steel pipe, and meanwhile, the groove is pressed out of the steel pipe to further prevent the gear sleeve from rotating; damping lubricating grease is injected into the inverted steel pipe, so that the operation of internal components can be fully lubricated; the operations of sealing the tail and inflating the tail in sequence can utilize the high-pressure environment to permeate nitrogen into the steel pipe, thereby ensuring the qualification rate and the quality of final products. The whole production process is simple to operate, and the steps are more reasonably optimized compared with the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without paying creative labor.
FIG. 1 is a schematic view of a non-adjustable pneumatic door closer;
FIG. 2 is a schematic view of the split structure of FIG. 1;
FIG. 3 is a schematic diagram of an adjustable pneumatic door closer;
FIG. 4 is a schematic view of the split structure of FIG. 3;
FIG. 5 is a schematic view of another non-adjustable pneumatic door closer;
FIG. 6 is a schematic view of the split structure of FIG. 5;
fig. 7 is a schematic view of another configuration of an adjustable pneumatic door closer;
FIG. 8 is a schematic view of the split structure of FIG. 7;
in the figure: 1-a steel pipe; 2-gear sleeve; 3-inner part; 4-a gasket; 5-welding a plate; 6-a piston member; 7-damping oil; 8-sealing the tail cover; 9-tail sealing; 10-tail blocking; 11-an internally threaded hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, the pneumatic door closer is a schematic structural diagram, and the door closer is not adjustable, and the internal air pressure is fixed and cannot be adjusted. For the pneumatic door closer with the structure, the specific production process comprises the following sequential steps:
s1, processing a steel pipe 1; chamfering and cleaning pretreatment are carried out on the steel pipe 1, so that the chamfer end is smooth and burr-free, and the smoothness of the inner wall of the steel pipe 1 is ensured;
s2, pressing in a gear sleeve 2; pressing a gear sleeve 2 in interference fit with the steel pipe 1 into the steel pipe 1;
s3, pressing a gear sleeve clamping groove; pressing a groove at the position, corresponding to the groove of the gear sleeve 2, outside the steel pipe 1 to prevent the gear sleeve 2 from rotating in the steel pipe 1;
s4, loading an inner part 3; the inner part 3 is arranged in the gear sleeve 2 according to the marking direction;
s5, assembling a gasket 4 and a welding plate 5; installing a gasket 4 and a welding plate 5 matched with the inner part 3 at the end part of the steel pipe 1, welding and fixing the welding plate 5 and the steel pipe 1 to seal the end part of the steel pipe 1, and performing tension detection on the strength of a welding part after welding and fixing the welding plate 5 and the steel pipe 1;
s6, filling damping lubricating grease; inverting the steel pipe 1 with the closed end down, and injecting damping grease which has a lubricating effect on the internal part 3 into the steel pipe 1;
s7, assembling a piston piece 6; the piston part 6 comprises 6 parts of an oil seal, a main piston, a damping oil seal, a damping piston rod, a damping piston and an O-shaped ring, the installation sequence is that the oil seal, the main piston and the damping oil seal are sequentially installed in the steel pipe 1, the damping piston is sleeved into the tail part of the damping piston rod to the step part of the damping piston rod, the tail end of the damping piston rod is riveted by a riveting machine to prevent the damping piston from loosening and falling, the O-shaped ring is sleeved into an annular groove on the damping piston, and finally the assembled damping piston rod is installed in the steel pipe 1;
s8, filling damping oil 7; filling a proper amount of damping oil 7 into the steel pipe 1;
s9, sealing the tail; firstly, a sealing tail cover 8 matched with the inner diameter of the steel pipe 1 is additionally arranged at the end part of the steel pipe 1, then the steel pipe 1 at the end part of the sealing tail cover 8 is subjected to closing operation, and the sealing tail cover 8 is packaged in the steel pipe 1 to prevent damping oil 7 from flowing out;
s10, inflating; and (3) placing the steel pipe 1 with the sealed tail in a high-pressure nitrogen environment, enabling the nitrogen to permeate the steel pipe 1 from the sealed tail by increasing the air pressure, carrying out pressure detection, operation test and quality detection on the product after inflation, respectively detecting the jacking force, the torsion force, the operation speed and the time of the product, carrying out laser coding on the qualified product, and packaging and warehousing the product.
Example two:
as shown in fig. 3 and 4, the structure of another pneumatic door closer is schematically illustrated, the door closer is adjustable, and the internal air pressure of the door closer can be adjusted according to needs. For the pneumatic door closer with the structure, the difference that only a tail sealing part exists between the pneumatic door closer and the door closer in the first embodiment is that the specific production process comprises the following sequential steps:
s1, processing a steel pipe 1; chamfering and cleaning pretreatment are carried out on the steel pipe 1, so that the chamfer end is smooth and burr-free, and the smoothness of the inner wall of the steel pipe 1 is ensured;
s2, pressing in a gear sleeve 2; pressing a gear sleeve 2 in interference fit with the steel pipe 1 into the steel pipe 1;
s3, pressing a gear sleeve clamping groove; pressing a groove at the position, corresponding to the groove of the gear sleeve 2, outside the steel pipe 1 to prevent the gear sleeve 2 from rotating in the steel pipe 1;
s4, loading an inner part 3; the inner part 3 is arranged in the gear sleeve 2 according to the marking direction;
s5, assembling a gasket 4 and a welding plate 5; installing a gasket 4 and a welding plate 5 matched with the inner part 3 at the end part of the steel pipe 1, welding and fixing the welding plate 5 and the steel pipe 1 to seal the end part of the steel pipe 1, and performing tension detection on the strength of a welding part after welding and fixing the welding plate 5 and the steel pipe 1;
s6, filling damping lubricating grease; inverting the steel pipe 1 with the closed end down, and injecting damping grease which has a lubricating effect on the internal part 3 into the steel pipe 1;
s7, assembling a piston piece 6; the piston part 6 comprises 6 parts of an oil seal, a main piston, a damping oil seal, a damping piston rod, a damping piston and an O-shaped ring, the installation sequence is that the oil seal, the main piston and the damping oil seal are sequentially installed in the steel pipe 1, the damping piston is sleeved into the tail part of the damping piston rod to the step part of the damping piston rod, the tail end of the damping piston rod is riveted by a riveting machine to prevent the damping piston from loosening and falling, the O-shaped ring is sleeved into an annular groove on the damping piston, and finally the assembled damping piston rod is installed in the steel pipe 1;
s8, filling damping oil 7; filling a proper amount of damping oil 7 into the steel pipe 1;
s9, sealing the tail; firstly, a tail seal 9 matched with the inner diameter of the steel pipe 1 is additionally arranged at the end part of the steel pipe 1, a tail plug 10 fixed with the steel pipe 1 is welded outside the tail seal 9, and an inner threaded hole 11 used for adjusting the position of the tail seal 9 is reserved in the middle of the tail plug 10;
s10, inflating; and (3) placing the steel pipe 1 with the sealed tail in a high-pressure nitrogen environment, enabling the nitrogen to permeate the steel pipe 1 from the sealed tail by increasing the air pressure, carrying out pressure detection, operation test and quality detection on the product after inflation, respectively detecting the jacking force, the torsion force, the operation speed and the time of the product, carrying out laser coding on the qualified product, and packaging and warehousing the product.
Here, it should be noted that: the pneumatic door closer with the two structures is approximately the same in production process, and only has difference in the tail sealing stage. And only can play the sealing effect to the damping oil 7 inside the steel pipe 1 after sealing the tail, can not influence subsequent inflation step, inflate the step, under the high-pressure gas environment that risees gradually nitrogen gas can permeate through the clearance between sealed tail cap 8/tail seal 9 and the steel pipe 1, and damping oil 7 can not ooze out, and in the normal use process, although the atmospheric pressure in the steel pipe 1 is higher than outside atmospheric pressure, the gas in the steel pipe 1 also can not permeate sealed tail cap 8/tail seal 9 and ooze. In addition, the air pressure in the steel pipe is fixed when the first embodiment is used, the air pressure in the second embodiment can be adjusted according to actual needs, and when the second embodiment is adjusted, the tail seal 9 can be pushed to move by arranging the bolt in the inner threaded hole 11 and rotating the bolt, so that the air pressure in the steel pipe is compressed, and the using effect of the whole door closer is changed. As for the specific use method and the working principle of the door closer, the prior art can be referred to. In a whole, the production process of the pneumatic door closer optimizes the production steps in the prior art, further improves the quality of products and has good practicability.
Example three:
as shown in fig. 5 and fig. 6, the structure of another non-adjustable pneumatic door closer is shown schematically, which is different from the first embodiment in that damping oil is not required to be injected into the steel tube 1 in this embodiment, and the operation is achieved only by the high pressure in the steel tube 1. Because of this too, the piston member 6 in this embodiment includes only the oil seal and the master piston, and the structure of the master piston is also different. The specific production process of this embodiment comprises the following sequential steps:
s1, processing a steel pipe 1; chamfering and cleaning pretreatment are carried out on the steel pipe 1, so that the chamfer end is smooth and burr-free, and the smoothness of the inner wall of the steel pipe 1 is ensured;
s2, pressing in a gear sleeve 2; pressing a gear sleeve 2 in interference fit with the steel pipe 1 into the steel pipe 1;
s3, pressing a gear sleeve clamping groove; pressing a groove at the position, corresponding to the groove of the gear sleeve 2, outside the steel pipe 1 to prevent the gear sleeve 2 from rotating in the steel pipe 1;
s4, loading an inner part 3; the inner part 3 is arranged in the gear sleeve 2 according to the marking direction;
s5, assembling a gasket 4 and a welding plate 5; installing a gasket 4 and a welding plate 5 matched with the inner part 3 at the end part of the steel pipe 1, welding and fixing the welding plate 5 and the steel pipe 1 to seal the end part of the steel pipe 1, and performing tension detection on the strength of a welding part after welding and fixing the welding plate 5 and the steel pipe 1;
s6, filling damping lubricating grease; inverting the steel pipe 1 with the closed end down, and injecting damping grease which has a lubricating effect on the internal part 3 into the steel pipe 1;
s7, assembling a piston piece 6; sequentially installing an oil seal and a main piston into the steel pipe 1;
s8, sealing the tail; firstly, a sealing tail cover 8 matched with the inner diameter of the steel pipe 1 is additionally arranged at the end part of the steel pipe 1, then the steel pipe 1 at the end part of the sealing tail cover 8 is subjected to closing operation, and the sealing tail cover 8 is packaged in the steel pipe 1;
s9, inflating; and (3) placing the steel pipe 1 subjected to tail sealing in a high-pressure nitrogen environment, enabling nitrogen to permeate into the steel pipe 1 from the tail sealing end by increasing the air pressure, carrying out pressure detection, operation test and quality detection on the product after inflation, respectively detecting the jacking force, torsion, operation speed and time of the product, carrying out laser coding on the qualified product, and packaging and warehousing the qualified product.
Example four:
as shown in fig. 7 and 8, the structure of another adjustable pneumatic door closer is shown schematically, and the difference between the structure and the embodiment is that in this embodiment, it is also unnecessary to inject damping oil into the steel tube 1, and the operation is realized only by the high pressure in the steel tube 1. Because of this too, the piston member 6 in this embodiment includes only the oil seal and the master piston, and the structure of the master piston is also different. The specific production process of this embodiment comprises the following sequential steps:
s1, processing a steel pipe 1; chamfering and cleaning pretreatment are carried out on the steel pipe 1, so that the chamfer end is smooth and burr-free, and the smoothness of the inner wall of the steel pipe 1 is ensured;
s2, pressing in a gear sleeve 2; pressing a gear sleeve 2 in interference fit with the steel pipe 1 into the steel pipe 1;
s3, pressing a gear sleeve clamping groove; pressing a groove at the position, corresponding to the groove of the gear sleeve 2, outside the steel pipe 1 to prevent the gear sleeve 2 from rotating in the steel pipe 1;
s4, loading an inner part 3; the inner part 3 is arranged in the gear sleeve 2 according to the marking direction;
s5, assembling a gasket 4 and a welding plate 5; installing a gasket 4 and a welding plate 5 matched with the inner part 3 at the end part of the steel pipe 1, welding and fixing the welding plate 5 and the steel pipe 1 to seal the end part of the steel pipe 1, and performing tension detection on the strength of a welding part after welding and fixing the welding plate 5 and the steel pipe 1;
s6, filling damping lubricating grease; inverting the steel pipe 1 with the closed end down, and injecting damping grease which has a lubricating effect on the internal part 3 into the steel pipe 1;
s7, assembling a piston piece 6; sequentially installing an oil seal and a main piston into the steel pipe 1;
s8, sealing the tail; firstly, a tail seal 9 matched with the inner diameter of the steel pipe 1 is additionally arranged at the end part of the steel pipe 1, a tail plug 10 fixed with the steel pipe 1 is welded outside the tail seal 9, and an inner threaded hole 11 used for adjusting the position of the tail seal 9 is reserved in the middle of the tail plug 10;
s9, inflating; and (3) placing the steel pipe 1 subjected to tail sealing in a high-pressure nitrogen environment, enabling nitrogen to permeate into the steel pipe 1 from the tail sealing end by increasing the air pressure, carrying out pressure detection, operation test and quality detection on the product after inflation, respectively detecting the jacking force, torsion, operation speed and time of the product, carrying out laser coding on the qualified product, and packaging and warehousing the qualified product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A production process of a pneumatic door closer is characterized by comprising the following steps: comprises the following sequential steps
S1, processing a steel pipe; chamfering and cleaning pretreatment are carried out on the steel pipe;
s2, pressing in a gear sleeve; pressing a gear sleeve in interference fit with the steel pipe into the steel pipe;
s3, pressing a gear sleeve clamping groove; pressing a groove at the position corresponding to the groove of the gear sleeve outside the steel pipe to prevent the gear sleeve from rotating in the steel pipe;
s4, loading an inner part; the inner part is arranged in the gear sleeve according to the identification direction;
s5, assembling a gasket and a welding plate; installing a gasket and a welding plate matched with the inner part at the end part of the steel pipe, and welding and fixing the welding plate and the steel pipe to realize the sealing of the end part of the steel pipe;
s6, filling damping lubricating grease; inverting the steel pipe with the closed end down, and injecting damping grease which has a lubricating effect on the internal parts into the steel pipe;
s7, assembling a piston piece; a piston piece is arranged in the steel pipe;
s8, sealing the tail; sealing the end of the steel pipe;
s9, inflating; and (3) placing the steel pipe with the sealed tail in a high-pressure nitrogen environment, and increasing the air pressure to enable the nitrogen to permeate into the steel pipe from the sealed tail.
2. The production process of a pneumatic door closer according to claim 1, characterized in that: after the step S7 is completed, firstly, a proper amount of damping oil is filled into the steel pipe, then, the step S8 is carried out, and after the tail is sealed, the damping oil is ensured not to leak.
3. A process of producing a pneumatic door closer according to claim 1 or 2, wherein: step S8 includes the following steps
S81, adding a sealing tail cover matched with the inner diameter of the steel pipe at the end part of the steel pipe;
s82, closing the steel pipe at the end part of the sealing tail cover, and packaging the sealing tail cover in the steel pipe.
4. A process of producing a pneumatic door closer according to claim 1 or 2, wherein: step S8 includes the following steps
S81, adding a tail seal matched with the inner diameter of the steel pipe at the end part of the steel pipe;
s82, welding a tail plug fixed with the steel pipe outside the tail plug, and reserving an internal threaded hole for adjusting the position of the tail plug in the middle of the tail plug.
5. The production process of a pneumatic door closer according to claim 1, characterized in that: in step S1, the chamfered ends are ensured to be smooth and burr-free, and the smoothness of the inner wall of the steel pipe is ensured.
6. The production process of a pneumatic door closer according to claim 1, characterized in that: in step S5, the welded plate and the steel pipe are welded and fixed, and then the tensile force is detected for the strength of the welded portion.
7. The production process of a pneumatic door closer according to claim 1, characterized in that: step S7 includes the following steps
S71, sequentially installing an oil seal, a main piston and a damping oil seal into the steel pipe;
s72, sleeving the damping piston into the tail of the damping piston rod to the step of the damping piston rod, and riveting the tail end of the damping piston rod by using a riveting machine to prevent the damping piston from loosening and falling off;
s73, sleeving an O-shaped ring into an annular groove on the damping piston;
and S74, installing the assembled damping piston rod into a steel pipe.
8. The production process of a pneumatic door closer according to claim 1, characterized in that: and step S9, performing pressure detection, operation test and quality detection on the product after inflation, performing laser coding on the qualified product, packaging and warehousing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375690.3A CN114700694A (en) | 2022-04-11 | 2022-04-11 | Production process of pneumatic door closer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375690.3A CN114700694A (en) | 2022-04-11 | 2022-04-11 | Production process of pneumatic door closer |
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| Publication Number | Publication Date |
|---|---|
| CN114700694A true CN114700694A (en) | 2022-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210375690.3A Pending CN114700694A (en) | 2022-04-11 | 2022-04-11 | Production process of pneumatic door closer |
Country Status (1)
| Country | Link |
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| CN (1) | CN114700694A (en) |
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|---|---|---|---|---|
| US3269061A (en) * | 1963-04-26 | 1966-08-30 | Tubest Sa | Pneumatic jack-operated swinging door and the like |
| CN1373307A (en) * | 2002-04-05 | 2002-10-09 | 蔡康荣 | Pneuamtic spring with speed regulating mechanism |
| CN104641159A (en) * | 2012-09-24 | 2015-05-20 | 沃尔沃建造设备有限公司 | Caulking method for preventing piston of hydraulic/pneumatic cylinder from being loosened |
| CN105587199A (en) * | 2016-02-25 | 2016-05-18 | 希美克(广州)实业有限公司 | Pneumatic door closer |
| CN106223761A (en) * | 2016-09-19 | 2016-12-14 | 李龙 | The pneumatically spring of pressure adjustable |
| CN206110949U (en) * | 2016-09-19 | 2017-04-19 | 李龙 | Pressure adjustable pneumatically spring |
| CN109434383A (en) * | 2018-11-13 | 2019-03-08 | 中国重型机械研究院股份公司 | A kind of production technology of high anti-corrosion acoustic baffle |
| CN209761142U (en) * | 2018-12-18 | 2019-12-10 | 杨学震 | Domestic gravity type door closer |
| CN112081483A (en) * | 2020-07-29 | 2020-12-15 | 承德特耐力门控科技有限公司 | Pneumatic automatic return device |
| CN113605801A (en) * | 2021-09-06 | 2021-11-05 | 承德特耐力门控科技有限公司 | Pneumatic rotary damping device |
| CN215718056U (en) * | 2021-09-06 | 2022-02-01 | 承德特耐力门控科技有限公司 | Pneumatic rotary damping device |
-
2022
- 2022-04-11 CN CN202210375690.3A patent/CN114700694A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269061A (en) * | 1963-04-26 | 1966-08-30 | Tubest Sa | Pneumatic jack-operated swinging door and the like |
| CN1373307A (en) * | 2002-04-05 | 2002-10-09 | 蔡康荣 | Pneuamtic spring with speed regulating mechanism |
| CN104641159A (en) * | 2012-09-24 | 2015-05-20 | 沃尔沃建造设备有限公司 | Caulking method for preventing piston of hydraulic/pneumatic cylinder from being loosened |
| CN105587199A (en) * | 2016-02-25 | 2016-05-18 | 希美克(广州)实业有限公司 | Pneumatic door closer |
| CN106223761A (en) * | 2016-09-19 | 2016-12-14 | 李龙 | The pneumatically spring of pressure adjustable |
| CN206110949U (en) * | 2016-09-19 | 2017-04-19 | 李龙 | Pressure adjustable pneumatically spring |
| CN109434383A (en) * | 2018-11-13 | 2019-03-08 | 中国重型机械研究院股份公司 | A kind of production technology of high anti-corrosion acoustic baffle |
| CN209761142U (en) * | 2018-12-18 | 2019-12-10 | 杨学震 | Domestic gravity type door closer |
| CN112081483A (en) * | 2020-07-29 | 2020-12-15 | 承德特耐力门控科技有限公司 | Pneumatic automatic return device |
| CN113605801A (en) * | 2021-09-06 | 2021-11-05 | 承德特耐力门控科技有限公司 | Pneumatic rotary damping device |
| CN215718056U (en) * | 2021-09-06 | 2022-02-01 | 承德特耐力门控科技有限公司 | Pneumatic rotary damping device |
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