CN113682929B - Door opening maintaining system suitable for elevator - Google Patents
Door opening maintaining system suitable for elevator Download PDFInfo
- Publication number
- CN113682929B CN113682929B CN202111009723.4A CN202111009723A CN113682929B CN 113682929 B CN113682929 B CN 113682929B CN 202111009723 A CN202111009723 A CN 202111009723A CN 113682929 B CN113682929 B CN 113682929B
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- China
- Prior art keywords
- door
- plate
- elevator
- touch pad
- movable plate
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- 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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
- B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers
- B66B13/26—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers between closing doors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Abstract
The invention belongs to the technical field of elevator equipment, and provides a door opening maintaining system suitable for an elevator, which comprises a first locking device, a second locking device and a locking device, wherein the first locking device comprises a touch plate, a thrust lock assembly, a driving rope and a stop block; the touch pad is arranged on the door plate and can synchronously slide along with the door plate to be contacted with the thrust lock component; the thrust lock assembly is provided with a movable plate, and the movable plate is located at a relative position distance between a first operation state and a second operation state; one end of the driving rope is connected with the movable plate, the other end of the driving rope is connected with the stop block, the stop block is arranged on the upper sill of the door plate in a swinging mode, a baffle plate is arranged on the stop block, and when the door plate performs closing action, the baffle plate moves to the front of a movement track of a door pulley of the door plate. The invention can effectively overcome the self-closing force of the landing door to ensure the opening state of the elevator door system in the requirement state, so that the elevator is safer and more reliable to use.
Description
Technical Field
The invention belongs to the technical field of elevator equipment, and particularly relates to a door opening maintaining system suitable for an elevator.
Background
After the conventional elevator door is opened, torque is usually output only by means of electromagnetic locked rotation force of a door motor, so that the elevator door is kept in an opened state. However, the landing door has certain self-closing capability, and in the self-closing movement of the landing door, the landing door needs to overcome the friction force corresponding to the weight of the landing door and the friction resistance of the car door. When the landing door is heavier, for example, the landing door is a fireproof door, a glass door and a sound insulation door, the self-closing force of the corresponding landing door is set to be large, and when the self-closing force of the landing door is larger than the sum of friction resistance of the car door and the landing door, the car door is also closed under the drive of the self-closing force of the landing door when the door system is in a power-off state. The conventional elevator door cannot prevent the door from closing in the power-off state.
When the fire alarm of building breaks down, the elevator that is running can lose power and stop, then starts stand-by power supply and moves the car to the nearby layer and opens the door and put people to the door system can stop the power supply, if the door is closed again after opening this moment, will not be able to make the personnel in the stranded car withdraw smoothly.
When maintenance personnel need to enter the car for maintenance, in order to keep the door open for a long time, the power supply of the door system is cut off, and if the self-closing force of the landing door is very large, the car door is automatically closed; in this regard, it is common practice for the maintenance personnel to place a piece of rubber in the sill groove and to prevent the door from closing by the friction between the sill groove and the rubber. The rubber is usually specially made, and is very inconvenient to use because of being carried by professionals.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a door opening and holding system for an elevator, which can effectively overcome the self-closing force of a landing door to ensure the open state of the elevator door system in a required state, so that the elevator is safer and more reliable to use.
The technical scheme adopted for solving the technical problems is as follows:
a door opening holding system suitable for an elevator, comprising a first locking device, wherein the first locking device comprises a touch pad, a thrust lock assembly, a driving rope and a stop block;
the touch panel is arranged on the door plate and can synchronously slide along with the door plate, and the touch panel can slide to be contacted with the thrust lock assembly so as to change the current operation state of the thrust lock assembly;
the thrust lock assembly at least comprises a first operation state and a second operation state which can be rotated, a movable plate is arranged on the thrust lock assembly, and a relative position distance exists between the movable plate in the first operation state and the movable plate in the second operation state;
one end of the driving rope is connected with the movable plate, the other end of the driving rope is connected with the stop block, the stop block is arranged on the upper sill of the door plate in a swinging mode, a baffle plate is arranged on the stop block, and when the door plate performs closing action, the baffle plate moves to the front of a movement track of a door pulley of the door plate.
Preferably, the touch pad is provided with a pressing portion, and the touch pad is provided on the door panel so as to be slidable left and right with respect to the door panel.
Preferably, the touch pad is arranged on the door plate in a manner of sliding up and down relative to the door plate;
the pressing part is arranged at the bottom end of the touch pad, a touch pad roller is arranged at the top end of the touch pad, an inclined slideway is arranged on the door plate upper sill corresponding to the touch pad roller, and the inclined lower end of the inclined slideway is close to the touch pad roller.
Preferably, the thrust lock assembly comprises a lock body which is arranged in a cylindrical structure, and a touching part, a rotary roller and a push rod which are sequentially arranged in the lock body;
the touch part is provided with a tooth structure towards one end of the rotary roller, a diagonal rack is arranged on the rotary roller at intervals corresponding to the tooth structure, a plurality of convex walls are arranged in the inner cavity of the lock body at intervals corresponding to the diagonal rack, one end, close to the diagonal rack, of each convex wall is provided with a diagonal tooth structure matched with the diagonal rack, and the diagonal rack can pass through the space between two adjacent convex walls;
one end of the push rod extends out of the lock body, a first spring is arranged between the lock body and one end of the push rod extending out of the lock body, and the movable plate is connected with the push rod and located outside the lock body.
Preferably, a fixed plate is arranged on the door plate upper ridge corresponding to the movable plate, a plurality of guide posts are arranged on the movable plate towards the fixed plate, and a plurality of through holes for the guide posts to pass through are formed in the fixed plate;
a plurality of second springs are arranged between the movable plate and the fixed plate.
Preferably, the device further comprises a plurality of guide wheels, and the driving rope is wound on the guide wheels.
Preferably, the device further comprises a second locking device, wherein the second locking device comprises a first locking wheel, a locking bar and a driving device for driving the locking bar to do linear motion;
the first locking wheel is arranged on the tensioning wheel of the upper door sill and rotates synchronously with the tensioning wheel, and the locking strip can move to be connected with the first locking wheel in a plug-in mode.
Preferably, the driving device is a linear motor, and the driving device is electrically connected with the elevator door control system.
Preferably, the device further comprises a second locking wheel, and the first locking wheel is in meshed connection with the second locking wheel; the locking bar can move to be inserted into teeth of the second locking wheel.
Preferably, the diameter of the first locking wheel is larger than the diameter of the second locking wheel.
Compared with the prior art, the invention has the beneficial effects that:
the first locking device is arranged in the scheme and comprises a touch pad, a thrust lock assembly, a driving rope and a stop block, wherein the touch pad can slide along with the opening of the door plate, when the door plate is opened and moves to a certain position, the touch pad is controlled to touch the thrust lock assembly, so that the operation state of the thrust lock assembly can be changed, for example, the movable plate is enabled to displace so as to drive the stop block to swing through the driving rope; at this time, the baffle plate arranged on the baffle plate can swing to the front of the door pulley on the door plate, thereby preventing the self-closing movement of the door plate. In this way, an operator can manually control the touch pad, and the operation is simple and convenient; and the mode of directly limiting and restraining the sliding of the door pulleys, namely the door plates, can effectively realize the blocking of the self-closing movement of the door plates, so that the landing door and the car door are not influenced by self-closing force, and the landing door is safer and more reliable in handling emergency and conventional maintenance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a door panel according to the present invention in a closed state.
Fig. 2 is a schematic view of the door panel according to the present invention in an opened state.
FIG. 3 is a schematic view of the internal structure of the thrust lock assembly of the present invention.
Fig. 4 is a schematic view of the thrust lock assembly of the present invention with the lock body removed.
Fig. 5 is a schematic structural view of the lock body of the present invention.
Fig. 6 is a schematic diagram of an operation structure of the second locking device of the present invention.
Wherein:
1-a first locking device, 11-a touch plate, 111-a pressing part, 112-a touch plate roller, 12-a thrust lock assembly, 121-a movable plate, 1211-a guide post, 1212-a second spring, 122-a lock body, 1221-a convex wall, 123-a touch part, 1231-a tooth structure, 124-a rotary roller, 1241-a helical rack, 125-a push rod, 1251-a first spring, 13-a driving rope, 14-a stop block and 141-a baffle plate;
2-second locking device, 21-first locking wheel, 22-second locking wheel, 23-locking bar, 24-driving device;
3-door plate, 31-door pulley;
4-door plate upper ridge, 41-inclined slide ways, 42-guide wheels, 43-door pulley guide rails, 44-fixed plates and 45-tensioning wheels.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, embodiments of the present application and features of the embodiments may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and the described embodiments are merely some, rather than all, embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
As shown in fig. 1 to 6, the present embodiment provides a door opening holding system suitable for an elevator, mainly comprising a first locking device 1 and a second locking device 2, wherein the first locking device 1 is provided, and one purpose is to realize manual control in a state of holding the door panel 3 open; the second locking device 2 can automatically control the door plate 3 in the state of keeping the door open on the basis of the second locking device. Through setting up two kinds of control methods to realize the effective maintenance under the door plant 3 state of opening the door, and the operation is simpler, convenient, safety.
Specifically, the first locking device 1 includes a touch pad 11, a thrust lock assembly 12, a driving rope 13, and a stop block 14, where the touch pad 11 is capable of moving to touch the thrust lock assembly 12, so that the thrust lock assembly 12 drives the driving rope 13 to operate, and then changes the current state of the stop block 14.
The touch pad 11 is arranged in a strip shape, and comprises a bottom end capable of extending out of the upper door sill 4 and a top end arranged in the upper door sill 4. In this embodiment, a pressing portion 111 is disposed on the bottom end of the touch pad 11, so as to facilitate the pressing operation of an operator; the top end of the touch pad 11 is provided with a transverse plate, the tail end of the transverse plate is provided with a touch pad roller 112, the door plate upper sill 4 is provided with an inclined slideway 41 corresponding to the touch pad roller 112, and the lower inclined end of the inclined slideway 41 is arranged close to the touch pad roller 112.
As a preferable mode, the touch pad 11 is provided on the door panel 3 so as to be slidable up and down, left and right with respect to the door panel 3. If a long hole (not shown in the figure) is provided on the touch pad 11, the long hole may be provided in the form of an inclined bar hole, a rectangular hole, or the like, and the width of the long hole corresponds to the pressing width of the pressing portion 111, so that the pressing portion 111 has enough movement space when driving the touch pad 11 to act; the height of the slot hole corresponds to the up-down sliding width of the touch pad 11, so that when the touch pad roller 112 contacts the inclined slideway 41 relatively, the whole touch pad 11 can be lifted upwards, and when the door panel 3 is in a door closing state, the bottom end of the touch pad 11 can be retracted.
In addition, the touch pad 11 is disposed on the door panel 3 and can slide synchronously with the door panel 3, such as synchronously moving transversely with the opening and closing of the door panel 3. In this process, the touch pad 11 may be controlled to slide into contact with the thrust lock assembly 12 to change the current operating state of the thrust lock assembly 12; in this embodiment, the thrust lock assembly 12 at least includes a first operating state and a second operating state that can be rotated, the thrust lock assembly 12 is provided with a movable plate 121, and a relative position distance exists between the movable plate 121 in the first operating state and the movable plate in the second operating state, and the state of the stop block 14 is adjusted by the position distance.
The door plate upper sill 4 is further provided with a plurality of guide wheels 42, the driving rope 13 is wound on the guide wheels 42, and the movement direction of the driving rope 13 can be set through the guide wheels 42. One end of the driving rope 13 is connected to the movable plate 121, and the other end of the driving rope 13 is connected to the stop block 14, so that the position change of the movable plate 121 can be linked with the state of the stop block 14. In this embodiment, the stop block 14 is swingably disposed on the door panel upper sill 4, for example, hinged to an end of the door pulley guide rail 43, and a plurality of stop plates 141 are disposed on one end of the stop block 14 near the touch panel 11, and when the door panel 3 performs a closing action, the stop plates 141 can move to be located in front of a movement track of the door pulley 31 of the door panel 3 under the action of the touch panel 11, so as to limit sliding of the door panel 3 and ensure a door opening state of the elevator.
As a preferred solution, in this embodiment, the thrust lock assembly 12 further includes a lock body 122 disposed in a cylindrical structure, and a touch portion 123, a rotary drum 124 and a push rod 125 sequentially disposed in the lock body 122; the lock body 122 is provided with an in-turned edge structure or a cover structure at both ends thereof to prevent the touching portion 123, the rotary drum 124 and the push rod 125 from being completely slid out.
More specifically, a tooth structure 1231 is disposed at one end of the touching portion 123 facing the rotary drum 124, and the other end of the touching portion 123 extends out of the lock body 122, so as to be matched with and contact with the touch pad 11. The rotary drum 124 is provided with a plurality of diagonal racks 1241 at intervals corresponding to the tooth structures 1231, and the diagonal racks 1241 are arranged in a consistent manner, so that the rotary drum 124 can have a consistent rotation direction. The inner cavity of the lock body 122 is provided with a plurality of convex walls 1221 at intervals corresponding to the helical rack 1241, one end of the convex wall 1221, which is close to the helical rack 1241, is provided with a helical tooth structure matched with the helical rack 1241, and when the helical rack 1241 is propped against the helical tooth structure, the thrust lock assembly 12 is in the first operation state at this time; in addition, the diagonal racks 1241 may pass between two adjacent convex walls 1221, and when the diagonal racks 1241 are disposed in the space formed between the convex walls 1221, the thrust lock assembly 12 is in the second operating state. As one of the principle reference examples, the cooperation between the touching portion 123, the rotary drum 124 and the push rod 125 may be specifically set and the operation mechanism may refer to the push-out mechanism of the push-type ball-point pen in the prior art.
One end of the push rod 125 is in contact with the rotary drum 124, the other end of the push rod 125 is disposed outside the lock body 122 in a protruding manner, and a first spring 1251 is disposed between the one end of the push rod 125 disposed in the lock body 122 and the lock body 122 to provide a rotation assistance force for the rotary drum 124; the movable plate 121 is connected to the push rod 125 and is located at the end outside the lock body 122. As a preferable solution, a fixed plate 44 is disposed on the door panel upper sill 4 corresponding to the movable plate 121, a plurality of guide posts 1211 are disposed on the movable plate 121 toward the fixed plate 44, a plurality of through holes for the guide posts 1211 to pass through are disposed on the fixed plate 44, and a limiting member is disposed at one end of the guide posts 1211 passing through the fixed plate 44, so as to prevent the guide posts 1211 from completely falling out of the fixed plate 44 during resetting. As another application example, the lateral movement distance of the movable plate 121 and the guiding posts 1211 can be controlled by controlling the lateral movement amplitude of the rotating drum 124, which is not described herein.
In addition, a plurality of second springs 1212 are provided between the movable plate 121 and the fixed plate 44; in this embodiment, the second springs 1212 are disposed in one-to-one correspondence with the guide posts 1211 and are serially connected to the guide posts 1211 to provide a sufficient resilient force.
The second locking device 2 comprises a first locking wheel 21, a second locking wheel 22, a locking bar 23 and a driving device 24 for driving the locking bar 23 to do linear motion; in this embodiment, the driving device 24 is a linear motor, and the driving device 24 is electrically connected to the elevator door control system, and when the elevator standby power supply is started, the loop of the driving device 24 is triggered to be closed, and at this time, the driving device 24 drives the locking bar 23 to perform linear motion.
Specifically, the first locking wheel 21 is disposed on a tensioning wheel 45 of the tensioning device of the door sill 4 and rotates synchronously with the tensioning wheel 45, and the locking strip 23 is selectively disposed to be capable of moving to be in plug connection with the first locking wheel 21 so as to block the rotation movement of the first locking wheel 21.
As a preferred solution, in this embodiment, the first locking wheel 21 and the second locking wheel 22 are both configured as gears, and the first locking wheel 21 and the second locking wheel 22 are engaged with each other and in transmission connection; the locking bar 23 is then arranged to be movable into the teeth provided on the second locking wheel 22. In addition, the diameter of the first locking wheel 21 is set larger than the diameter of the second locking wheel 22.
The present invention is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical proposal of the present invention.
Claims (9)
1. A door opening holding system suitable for an elevator, comprising a first locking device, wherein the first locking device comprises a touch pad, a thrust lock assembly, a driving rope and a stop block;
the touch panel is arranged on the door plate and can synchronously slide along with the door plate, and the touch panel can slide to be contacted with the thrust lock assembly so as to change the current operation state of the thrust lock assembly;
the thrust lock assembly at least comprises a first operation state and a second operation state which can be rotated, a movable plate is arranged on the thrust lock assembly, and a relative position distance exists between the movable plate in the first operation state and the movable plate in the second operation state;
one end of the driving rope is connected with the movable plate, the other end of the driving rope is connected with the stop block, the stop block is arranged on the upper sill of the door plate in a swinging mode, a baffle plate is arranged on the stop block, and when the door plate performs closing action, the baffle plate moves to the front of a movement track of a door pulley of the door plate.
2. The door opening holding system for an elevator according to claim 1, wherein the touch pad is provided with a pressing portion, and the touch pad is provided on the door panel so as to be slidable left and right with respect to the door panel.
3. The door opening maintaining system for elevator according to claim 2, wherein the touch pad is provided on the door panel slidably up and down with respect to the door panel;
the pressing part is arranged at the bottom end of the touch pad, a touch pad roller is arranged at the top end of the touch pad, an inclined slideway is arranged on the door plate upper sill corresponding to the touch pad roller, and the inclined lower end of the inclined slideway is close to the touch pad roller.
4. A door opening maintaining system for elevator according to any one of claims 1-3, wherein the thrust lock assembly comprises a lock body provided in a cylindrical structure, a touch part, a rotary drum and a push rod sequentially provided in the lock body;
the touch part is provided with a tooth structure towards one end of the rotary roller, a diagonal rack is arranged on the rotary roller at intervals corresponding to the tooth structure, a plurality of convex walls are arranged in the inner cavity of the lock body at intervals corresponding to the diagonal rack, one end, close to the diagonal rack, of each convex wall is provided with a diagonal tooth structure matched with the diagonal rack, and the diagonal rack can pass through the space between two adjacent convex walls;
one end of the push rod extends out of the lock body, a first spring is arranged between the lock body and one end of the push rod extending out of the lock body, and the movable plate is connected with the push rod and located outside the lock body.
5. The door opening maintaining system for elevator as claimed in claim 4, wherein the door plate upper sill is provided with a fixed plate corresponding to the movable plate, the movable plate is provided with a plurality of guide posts facing the fixed plate, and the fixed plate is provided with a plurality of through holes for the guide posts to pass through;
a plurality of second springs are arranged between the movable plate and the fixed plate.
6. The door opening maintaining system for elevator as claimed in claim 5, further comprising guide wheels, the driving rope being wound around the guide wheels.
7. A door opening holding system for an elevator according to claim 1 or 6, further comprising a second locking device comprising a first locking wheel, a locking bar and a driving device for driving the locking bar in a linear motion;
the first locking wheel is arranged on the tensioning wheel of the upper sill of the door plate and rotates synchronously with the tensioning wheel;
the second locking device further comprises a second locking wheel, and the first locking wheel is in meshed connection with the second locking wheel; the locking bar can move to be inserted into teeth of the second locking wheel.
8. The door opening maintaining system for elevator according to claim 7, wherein the driving device is a linear motor, and the driving device is electrically connected to an elevator door control system.
9. The door opening maintaining system for an elevator according to claim 7, wherein the first locking wheel has a diameter greater than a diameter of the second locking wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111009723.4A CN113682929B (en) | 2021-08-31 | 2021-08-31 | Door opening maintaining system suitable for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111009723.4A CN113682929B (en) | 2021-08-31 | 2021-08-31 | Door opening maintaining system suitable for elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113682929A CN113682929A (en) | 2021-11-23 |
| CN113682929B true CN113682929B (en) | 2023-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111009723.4A Active CN113682929B (en) | 2021-08-31 | 2021-08-31 | Door opening maintaining system suitable for elevator |
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| CN (1) | CN113682929B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368665A (en) * | 2021-12-23 | 2022-04-19 | 日立电梯（中国）有限公司 | Elevator, elevator auxiliary door opening device and method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08169673A (en) * | 1994-12-20 | 1996-07-02 | Hitachi Building Syst Eng & Service Co Ltd | Control device of elevator |
| CN2663381Y (en) * | 2003-12-12 | 2004-12-15 | 广州日立电梯有限公司 | Door opening force keeping device of elevator door machine |
| JP2006264856A (en) * | 2005-03-23 | 2006-10-05 | Toshiba Elevator Co Ltd | Door device for elevator |
| JP2007015778A (en) * | 2005-07-05 | 2007-01-25 | Toshiba Elevator Co Ltd | Hall door closing device of elevator |
| JP5139142B2 (en) * | 2008-04-16 | 2013-02-06 | 株式会社日立製作所 | Elevator door equipment |
| CN102116125B (en) * | 2011-01-18 | 2012-11-14 | 深圳职业技术学院 | Folding normally-open fireproof door |
| KR101468619B1 (en) * | 2012-11-08 | 2014-12-03 | (주)에이스앤아이 | Door locking device |
| CN204198194U (en) * | 2014-11-08 | 2015-03-11 | 台州富士电梯制造有限公司 | Emergency staircase |
| CN205025287U (en) * | 2015-09-29 | 2016-02-10 | 镇江香江云动力科技有限公司 | Data center micromodule closed passage door |
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2021
- 2021-08-31 CN CN202111009723.4A patent/CN113682929B/en active Active
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