CN107829669B - Manual door opening system of roller shutter door motor - Google Patents
Manual door opening system of roller shutter door motor Download PDFInfo
- Publication number
- CN107829669B CN107829669B CN201711248512.XA CN201711248512A CN107829669B CN 107829669 B CN107829669 B CN 107829669B CN 201711248512 A CN201711248512 A CN 201711248512A CN 107829669 B CN107829669 B CN 107829669B
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- China
- Prior art keywords
- rotor
- transmission shaft
- motor
- manual
- brake disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
- E06B9/68—Operating devices or mechanisms, e.g. with electric drive
- E06B9/74—Operating devices or mechanisms, e.g. with electric drive adapted for selective electrical or manual operation
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
- E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
- Power-Operated Mechanisms For Wings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention provides a manual door opening system of a roller shutter door motor, which comprises a motor shell, a brake shell and a door body, wherein a motor rotating shaft for driving the roller shutter door to move is arranged in the motor shell; the transmission shaft penetrates through the top plate, an inner hexagonal cavity is formed in the transmission shaft, which is close to the motor rotating shaft end, and a positioning hexagonal nut matched with the inner hexagonal cavity is arranged at the motor rotating shaft end.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a manual door opening system of a roller shutter door motor.
Background
The rolling door is widely applied to some public places, and is driven by a motor to move up and down in general, but needs to be opened and closed manually to ensure personal and property safety under the condition that the door needs to be closed such as power failure or click damage. At present, a method is commonly adopted, wherein a door body is lifted by manually pulling a chain wound on a brake pad, the operation is time-consuming and labor-consuming due to low transmission efficiency, and transmission failure is caused by abrasion of the brake pad after frequent use.
Disclosure of Invention
The invention aims to provide a manual door opening system of a roller shutter door motor, which is convenient to operate and high in reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a manual system of opening door of rolling slats door motor, includes the motor casing, be equipped with the rotor of drive rolling slats door activity in the motor casing, its characterized in that still includes:
a rear housing including a top plate and side plates;
the transmission shaft penetrates through the top plate, an inner hexagonal cavity is formed in the portion, close to the rotor end, of the transmission shaft, and a positioning hexagonal nut matched with the inner hexagonal cavity is arranged at the rotor end.
Preferably, the rotor is provided with a brake disc group, the brake disc group comprises a brake main body connected with the rotor in a sleeved mode, and a driving surface matched with the rotor to limit relative rotation between the brake main body and the rotor is arranged on the inner side of the brake main body.
Preferably, the brake main body is provided with a positioning groove for partially accommodating the positioning hexagonal nut, the end part of the transmission shaft is provided with a limiting nut for limiting the movement of the positioning hexagonal nut, and the diameter of the outer flange part of the limiting nut is smaller than that of the outer flange part of the positioning hexagonal nut.
As one preference, the brake disc group comprises a friction disc and a swinging block control console, two swinging blocks are hinged to the swinging block control console, a tension spring is connected between the two swinging blocks, a brake block is arranged in the rear shell in parallel with the friction disc, a sleeve is sleeved on the transmission shaft, one end of the sleeve is connected with the brake block, a reset spring is arranged between the other end of the sleeve and the top plate, and a top plate is further arranged between the top plate and the reset spring.
Preferably, a partition plate is arranged in the rear housing, the partition plate comprises a guide hole at the center, and the transmission shaft passes through the guide hole.
Preferably, a manual hexagonal nut is arranged at the end of the transmission shaft, which is positioned at the outer side of the rear shell, and a positioning pin shaft is connected between the manual hexagonal nut and the transmission shaft.
Preferably, a supporting piece is arranged between the motor casing and the rear casing, the supporting piece comprises a containing hole, an annular groove is arranged in the containing hole, a bearing is arranged in the annular groove, one end of the supporting piece is provided with a bearing baffle which is matched with the annular groove to limit the displacement of the bearing, and the rotor penetrates through the containing hole.
Preferably, a motor and a speed reducer are arranged in the motor casing.
In summary, compared with the prior art, the invention has the advantages that: the transmission shaft is pressed in to enable the inner hexagonal cavity of the transmission shaft to be clamped with the positioning hexagonal nut, and the manual door opening can be realized by rotating the transmission shaft through an electric screwdriver; when the door is opened manually, the sleeve is pulled up to enable the brake pad to be far away from the brake disc, the connection driving structure is stable and reliable, when the door is opened manually and encounters accidents, the sleeve is loosened to realize the braking of the door body, and under the action of a spring, the electric batch and the brake shaft of an operator can be smoothly and easily separated, so that the safety is high.
Drawings
FIG. 1 is a cross-sectional view of the structure of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
fig. 3 is a schematic structural view of a brake disc pack.
The reference numerals in the figures are as follows:
1. motor housing, 11, rotor, 111, positioning hex nut, 112, stop nut, 2, rear housing, 21, top plate, 22, side plate, 23, drive shaft, 231, internal hex cavity, 232, sleeve, 233, return spring, 234, manual hex nut, 235, positioning pin, 24, top plate, 25, spacer, 3, brake disc set, 31, brake body, 311, driving surface, 312, detent, 32, friction disc, 33, flighting console, 331, flighting, 34, tension spring, 4, support, 41, receiving hole, 42, annular groove, 43, bearing, 44.
Detailed Description
The invention will be further described with reference to examples of embodiments in the drawings.
As shown in fig. 1 and 2, the manual door opening system of the roller shutter door motor comprises a motor casing 1, wherein a rotor 11 for driving the roller shutter door to move is arranged in the motor casing 1. The rotor 11 is connected with the roll-up door and drives the roll-up door to ascend and descend. One end of the motor casing 1 is provided with a rear casing 2, and the rear casing 2 includes a top plate 21 and a side plate 22. The circular top plate 21, the side plates 22 and the motor casing 1 form a cavity. A transmission shaft 23 is arranged through the top plate 21, an inner hexagonal cavity 231 is arranged at the end, close to the rotor 11, of the transmission shaft 23, and a positioning hexagonal nut 111 matched with the inner hexagonal cavity 231 is arranged at the end of the rotor 11. When the transmission shaft 23 is moved to the inner side of the rear housing 2, and the inner hexagonal cavity 231 is in plug-in fit with the positioning hexagonal nut 111, the rotor 11 can be driven to rotate by rotating the transmission shaft 23, so that the rolling shutter door can ascend and descend.
The rotor 11 is provided with a brake disc group 3, the brake disc group 3 comprises a brake main body 31 which is connected with the rotor 11 in a sleeved mode, and a driving surface 311 which is matched with the rotor 11 to limit relative rotation between the two parts is arranged on the inner side of the brake main body 31. The driving surface 311 is a planar structure parallel to the rotation axis of the rotor 11 and located at one side of the end of the rotor 11, and the driving surface 311 transmits torque between the rotor 11 and the brake disc set 3, so that the brake disc set 3 rotates along with the rotor 11.
The brake main body 31 is provided with a positioning groove 312 for partially accommodating the positioning hexagonal nut 111, the upper part of the positioning hexagonal nut 111 is positioned outside the positioning groove 312, the end part of the transmission shaft 23 is provided with a limit nut 112 for limiting the movement of the positioning hexagonal nut 111, and the diameter of the outer flange part of the limit nut 112 is smaller than that of the outer flange part of the positioning hexagonal nut 111. The limit nut 112 is in threaded connection with the transmission shaft 23. When the transmission shaft 23 is pushed to one side of the rotor 11, the limit nut 112 penetrates through the inner hexagonal cavity 231, the inner hexagonal cavity 231 is clamped with the positioning hexagonal nut 111 to realize transmission between the rotor 11 and the transmission shaft 23, at the moment, the limit nut 112 is positioned in the inner hexagonal cavity 231 and plays a role in limiting axial displacement of the positioning hexagonal nut 111, the positioning hexagonal nut 111 is prevented from loosening in the using process of the motor, and meanwhile, the influence of rotation of the limit nut 112 on cooperation between the inner hexagonal cavity 231 and the positioning hexagonal nut 111 is avoided.
As shown in fig. 3, the brake disc set 3 includes a friction disc 32 and a swing block console 33, two swing blocks 331 are hinged on the swing block console 33, the two swing blocks 331 are located at the outer edge of the swing block console 33 and hinged with the swing block console 33, and a tension spring 34 is connected between the two swing blocks 331. When the brake disc 3 rotates, the centrifugal force counteracts the pulling force of the tension spring, and the throwing block 331 rotates relative to the hinge position. A brake pad is arranged in the rear shell 2 in parallel with the friction disc 32, a sleeve 232 is sleeved on the transmission shaft 23, one end of the sleeve 232 is connected with the brake pad, a return spring 233 is arranged between the other end of the sleeve 232 and the top plate 21, and a top plate 24 is further arranged between the top plate 21 and the return spring 233. The return spring 233 acts on the sleeve 232 to cause it to move toward the friction plate 32 side. When the transmission shaft 23 and the brake shaft are matched to manually rotate the roller shutter door, the sleeve 232 is pulled towards one end far away from the brake disc group 3 to separate the brake pad from the friction disc 32, and the sleeve 232 is loosened under the action of the return spring 233 to realize the braking of the door body, so that dangerous situations possibly caused by accidents are avoided. The sleeve 232 is arranged to ensure the orbital nature of the drive shaft 23 during movement.
The baffle 25 is arranged in the rear shell 2, the baffle 25 comprises a guide hole at the center, and the transmission shaft 23 passes through the guide hole to limit the transmission shaft 23, so that the activity track and the smoothness of connection with the rotor 11 are ensured. The transmission shaft 23 is provided with a manual hexagonal nut 234 at the outer end of the rear housing 2, and the manual hexagonal nut 234 is connected with the transmission shaft 23 through a positioning pin 235. The manual opening of the roller shutter door can be realized by sleeving the electric batch with the manual hexagonal nut 234.
A supporting piece 4 is arranged between the motor casing 1 and the rear casing 2, the supporting piece 4 comprises a containing hole 41, an annular groove 42 is arranged in the containing hole 41, a bearing 43 is arranged in the annular groove 42, a bearing baffle 44 which is matched with the annular groove 42 to limit the displacement of the bearing 43 is arranged at one end of the supporting piece 4, and the rotor 11 passes through the containing hole 41. The bearing 43 limits the end of the rotor 11, counteracts the moment generated at the joint of the end and the driving surface 311, and ensures the position stability of the central axis in the rotation process of the rotor 11. The bearing 43 simultaneously positions the brake disc pack 3. The bearing retainer 44 secures the bearing 43 within the annular groove 42 to limit displacement thereof. The motor shell 1 is internally provided with a motor and a speed reducer which are connected with a rolling door rotating shaft.
The above description is only illustrative of the invention so that those skilled in the art can fully practice the present invention, but not limiting the invention, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without inventive contribution, as desired, which are not creatively modified, but are protected by patent laws within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a manual system of opening door of rolling slats door motor, includes motor casing (1), be equipped with rotor (11) of drive rolling slats door activity in motor casing (1), its characterized in that still includes:
a rear housing (2), the rear housing (2) comprising a top plate (21) and side plates (22);
the transmission shaft (23), the transmission shaft (23) passes through the top plate (21), an inner hexagonal cavity (231) is arranged at one end, close to the rotor (11), of the transmission shaft (23), and a positioning hexagonal nut (111) matched with the inner hexagonal cavity (231) is arranged at the end part of the rotor (11);
the brake disc assembly comprises a rotor (11), and is characterized in that a brake disc assembly (3) is arranged on the rotor (11), the brake disc assembly (3) comprises a driving part (31) which is connected with the rotor (11) in a sleeved mode, a driving surface (311) which is matched with the rotor (11) to limit relative rotation between the driving part and the rotor is arranged on the inner side of the driving part (31), the driving surface (311) is of a plane structure which is positioned on one side of the end of the rotor (11) and is parallel to the rotation axis of the rotor (11), and the driving surface (311) transmits torque between the rotor (11) and the brake disc assembly (3) so that the brake disc assembly (3) rotates along with the rotor (11);
the driving part (31) is provided with a positioning groove (312) for partially accommodating the positioning hexagonal nut (111), the end part of the transmission shaft (23) is provided with a limit nut (112) for limiting the movement of the positioning hexagonal nut (111), the diameter of the outer flange part of the limit nut (112) is smaller than that of the outer flange part of the positioning hexagonal nut (111), and the limit nut (112) is in threaded connection with the transmission shaft (23);
the brake disc group (3) comprises a friction disc (32) and a swing block control console (33), two swing blocks (331) are hinged to the swing block control console (33), tension springs are connected between the two swing blocks (331), brake pads are arranged in the rear shell (2) in parallel with the friction disc (32), a sleeve (232) is sleeved on the transmission shaft (23), one end of the sleeve (232) is connected with the brake pads, a return spring (233) is arranged between the other end of the sleeve (232) and the top plate (21), and a top plate (24) is further arranged between the top plate (21) and the return spring (233); when the brake disc (3) rotates, centrifugal force counteracts the pulling force of the tension spring, the throwing block (331) rotates relative to the hinge position, and the reset spring (233) acts on the sleeve (232) to enable the sleeve to move towards one side of the friction disc (32).
2. A roller shutter door motor manual door opening system as claimed in claim 1, wherein: a baffle plate (25) is arranged in the rear shell (2), the baffle plate (25) comprises a guide hole positioned at the center, and the transmission shaft (23) penetrates through the guide hole.
3. A roller shutter door motor manual door opening system as claimed in claim 1, wherein: the transmission shaft (23) is located at the outer side end of the rear shell (2) and is provided with a manual hexagonal nut (234), and a positioning pin shaft (235) is connected between the manual hexagonal nut (234) and the transmission shaft (23).
4. A roller shutter door motor manual door opening system as claimed in claim 1, wherein: be provided with support piece (4) between motor casing (1) with back casing (2), support piece (4) are including holding hole (41), be equipped with ring channel (42) in holding hole (41), be provided with bearing (43) in ring channel (42), support piece (4) one end be equipped with ring channel (42) cooperation restriction bearing baffle (44) of bearing (43) displacement, rotor (11) pass holding hole (41).
5. A roller shutter door motor manual door opening system as claimed in claim 1, wherein: and a motor and a speed reducer are arranged in the motor casing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248512.XA CN107829669B (en) | 2017-12-01 | 2017-12-01 | Manual door opening system of roller shutter door motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248512.XA CN107829669B (en) | 2017-12-01 | 2017-12-01 | Manual door opening system of roller shutter door motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107829669A CN107829669A (en) | 2018-03-23 |
| CN107829669B true CN107829669B (en) | 2023-12-26 |
Family
ID=61647013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711248512.XA Active CN107829669B (en) | 2017-12-01 | 2017-12-01 | Manual door opening system of roller shutter door motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107829669B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110685584A (en) * | 2019-10-25 | 2020-01-14 | 漳州市安麟机电研究所有限公司 | Motor system for driving rolling door and rolling door |
| CN115434628B (en) * | 2022-09-15 | 2024-04-05 | 浙江格米力智能科技有限公司 | Manual-automatic integrated tubular motor structure of roller shutter |
Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0307333A1 (en) * | 1987-08-26 | 1989-03-15 | Richard Bubendorff | Roller blind for doors, windows and the like |
| DE3907985A1 (en) * | 1989-03-11 | 1990-09-13 | Rolf Machill | Auxiliary drive for a rolling-shutter-door drive |
| EP0751278A1 (en) * | 1995-06-28 | 1997-01-02 | Bubendorff S.A. | Motorized roller shutter |
| JPH0988458A (en) * | 1995-07-17 | 1997-03-31 | Bunka Shutter Co Ltd | Winder of shutter, etc |
| EP0775798A1 (en) * | 1995-11-27 | 1997-05-28 | Simu | Rotational drive device for the take-up element of a roller shutter |
| US5711360A (en) * | 1996-02-14 | 1998-01-27 | Simu | Operating device for rolling shutter assemblies |
| JPH1088945A (en) * | 1996-09-13 | 1998-04-07 | Sanwa Shutter Corp | Manual operating device for electric shutter opening and closing device |
| US6092582A (en) * | 1999-03-10 | 2000-07-25 | Liu; Kuei-Chang | Motor drive for an electric rolling steel door |
| WO2001055548A1 (en) * | 2000-01-25 | 2001-08-02 | Securedrive Systems Limited | Drive system |
| CN1738157A (en) * | 2005-09-07 | 2006-02-22 | 杭州威仕自动化设备有限公司 | Tube shaped electrical machine via non-electromagnetic force to release brake |
| JP2006057421A (en) * | 2004-08-24 | 2006-03-02 | Aichi Electric Co Ltd | Shutter opening-closing machine |
| JP2008261128A (en) * | 2007-04-11 | 2008-10-30 | Ogura Clutch Co Ltd | Braking device of electric shutter opening/closing machine |
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| CN204920750U (en) * | 2015-08-06 | 2015-12-30 | 宁波欧晨机电有限公司 | Rolling slats door lift drive |
| CN204960773U (en) * | 2015-10-08 | 2016-01-13 | 王忠王 | Prevent weighing down rolling door machine brake disc |
| CN205019642U (en) * | 2015-10-08 | 2016-02-10 | 王忠王 | Balanced cylinder |
| CN205141904U (en) * | 2015-10-22 | 2016-04-06 | 宁波市海誉机电科技有限公司 | Chain motor hand power stroke device |
| CN205141902U (en) * | 2015-10-22 | 2016-04-06 | 宁波市海誉机电科技有限公司 | Hand fastener stringer tubular motor |
| CN206608094U (en) * | 2017-04-07 | 2017-11-03 | 王忠王 | A kind of heavy rolling screen door of double brake |
| CN207892511U (en) * | 2017-12-01 | 2018-09-21 | 福建安麟智能科技股份有限公司 | A kind of motor of rolling shutter door opens Door by Hand system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7428918B2 (en) * | 2005-04-19 | 2008-09-30 | Martin Door Manufacturing, Inc. | Controlled descent device |
| US8230759B2 (en) * | 2008-12-03 | 2012-07-31 | Chung Hsien Hsieh | Integrated brake and chain disk assembly for door operator |
| US8985181B2 (en) * | 2013-04-30 | 2015-03-24 | Chung Hsien Hsieh | Machine mechanism of a rolling door operator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0307333A1 (en) * | 1987-08-26 | 1989-03-15 | Richard Bubendorff | Roller blind for doors, windows and the like |
| DE3907985A1 (en) * | 1989-03-11 | 1990-09-13 | Rolf Machill | Auxiliary drive for a rolling-shutter-door drive |
| EP0751278A1 (en) * | 1995-06-28 | 1997-01-02 | Bubendorff S.A. | Motorized roller shutter |
| JPH0988458A (en) * | 1995-07-17 | 1997-03-31 | Bunka Shutter Co Ltd | Winder of shutter, etc |
| EP0775798A1 (en) * | 1995-11-27 | 1997-05-28 | Simu | Rotational drive device for the take-up element of a roller shutter |
| US5711360A (en) * | 1996-02-14 | 1998-01-27 | Simu | Operating device for rolling shutter assemblies |
| JPH1088945A (en) * | 1996-09-13 | 1998-04-07 | Sanwa Shutter Corp | Manual operating device for electric shutter opening and closing device |
| US6092582A (en) * | 1999-03-10 | 2000-07-25 | Liu; Kuei-Chang | Motor drive for an electric rolling steel door |
| WO2001055548A1 (en) * | 2000-01-25 | 2001-08-02 | Securedrive Systems Limited | Drive system |
| JP2006057421A (en) * | 2004-08-24 | 2006-03-02 | Aichi Electric Co Ltd | Shutter opening-closing machine |
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| JP2008261128A (en) * | 2007-04-11 | 2008-10-30 | Ogura Clutch Co Ltd | Braking device of electric shutter opening/closing machine |
| CN102882309A (en) * | 2012-09-26 | 2013-01-16 | 宁波杜亚机电技术有限公司 | Manual tubular motor |
| CN103437689A (en) * | 2013-08-30 | 2013-12-11 | 吴诗舜 | Rolling gate control device |
| CN204920750U (en) * | 2015-08-06 | 2015-12-30 | 宁波欧晨机电有限公司 | Rolling slats door lift drive |
| CN204960773U (en) * | 2015-10-08 | 2016-01-13 | 王忠王 | Prevent weighing down rolling door machine brake disc |
| CN205019642U (en) * | 2015-10-08 | 2016-02-10 | 王忠王 | Balanced cylinder |
| CN205141904U (en) * | 2015-10-22 | 2016-04-06 | 宁波市海誉机电科技有限公司 | Chain motor hand power stroke device |
| CN205141902U (en) * | 2015-10-22 | 2016-04-06 | 宁波市海誉机电科技有限公司 | Hand fastener stringer tubular motor |
| CN206608094U (en) * | 2017-04-07 | 2017-11-03 | 王忠王 | A kind of heavy rolling screen door of double brake |
| CN207892511U (en) * | 2017-12-01 | 2018-09-21 | 福建安麟智能科技股份有限公司 | A kind of motor of rolling shutter door opens Door by Hand system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107829669A (en) | 2018-03-23 |
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