CN107035281B - Safety evacuation door - Google Patents
Safety evacuation door Download PDFInfo
- Publication number
- CN107035281B CN107035281B CN201710355720.3A CN201710355720A CN107035281B CN 107035281 B CN107035281 B CN 107035281B CN 201710355720 A CN201710355720 A CN 201710355720A CN 107035281 B CN107035281 B CN 107035281B
- Authority
- CN
- China
- Prior art keywords
- door
- rod
- positioning
- pneumatic device
- spring
- 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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- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- 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
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B3/00—Fastening knobs or handles to lock or latch parts
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
- E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
- E05C17/46—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member
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- 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
- E05F15/00—Power-operated mechanisms for wings
- E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
- E05F15/53—Power-operated mechanisms for wings using fluid-pressure actuators for swinging wings
-
- 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
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/32—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
- E06B3/34—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
- E06B3/36—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement with a single vertical axis of rotation at one side of the opening, or swinging through the opening
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/13—Type of wing
- E05Y2900/132—Doors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Closing And Opening Devices For Wings, And Checks For Wings (AREA)
Abstract
The invention discloses a safe evacuation door, which comprises a door frame and a door hinged on the door frame; a pneumatic device for pushing the door to open is arranged between the door frame and the door; the door is also provided with a joint bearing, a spanner, a button rod, a spring base, a first spring, a connecting rod and a pull rod head; the pull rod head is sequentially connected with a joint, a gear shaft and a lock tongue through a pull rod, and a lock hole matched with the lock tongue is formed in the door frame. When the door needs to be opened, the spanner is downwards pulled to enable the button rod to move upwards, so that the connecting rod is driven to rotate clockwise, the pull rod head pulls the joint, the gear shaft and the lock tongue leftwards through the pull rod, the lock tongue is separated from the lock hole, and the door can be upwards pushed to be opened, so that the operation is simple and reliable; when the door is pushed upwards, the pneumatic device can provide power, so that the door opening strength is reduced; when the door is turned up, the locating pin can slide into the locating hole of the locating fixing rod, so that the door can not be automatically closed, and the door can be closed only by pulling the locating pin outwards, so that the safety is high.
Description
Technical Field
The invention relates to the field of safety doors, in particular to a safety evacuation door.
Background
The escape passage of the large-scale underground square is provided with the safety door, the door is in a closed state in normal practice, the safety door is firm and has good sealing performance, and once danger occurs underground, people can open the safety door from the inside, so that escape is realized. However, most of existing safety doors are provided with a power source through electric power, the opening is complex, once the safety door loses the electric power at the same time when a danger occurs, the safety door cannot be opened, and the danger coefficient is relatively large.
Therefore, a safety door suitable for an escape passage in construction of a large-scale underground square is urgently needed, and the door is a passive automatic opening door, is simple and labor-saving to open and is reasonable in structure. The problem of power is solved, the problem of a power source without electricity is solved, and the danger coefficient increased due to the problem of electricity is greatly reduced.
Disclosure of Invention
The invention aims to provide a safety evacuation door, which solves the problems of high risk coefficient and complex opening due to the fact that the existing safety door power source is a power source.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a safe evacuation door, which comprises a door frame and a door hinged on the door frame;
a pneumatic device for pushing the door to open is arranged between the door frame and the door;
a positioning movable rod is arranged at one end, close to the hinge joint, of the door, and a positioning fixed rod matched with the positioning movable rod is arranged on the door frame; the free end of the positioning movable rod is provided with a positioning pin through a positioning spring, and the positioning spring presses the positioning pin to the positioning fixed rod; the positioning fixing rod is provided with a positioning hole;
the door is also provided with a joint bearing, a spanner, a button rod, a spring base, a first spring, a connecting rod and a pull rod head; the knuckle bearing is arranged on the back of the door; the middle part of the wrench is arranged at the top end of the knuckle bearing, and the end head is hinged with a button rod; the button rod is inserted into the spring base, and the spring base is arranged on the back surface of the door; the first spring is arranged between the bottom of the button rod and the bottom of the spring base, and provides downward elasticity for the button rod; the middle part of the connecting rod is rotatably arranged on the back of the door, one end of the connecting rod is connected with the bottom of the button rod, and the other end of the connecting rod is hinged with the pull rod head to convert the up-and-down motion of the button rod into the left-and-right motion of the pull rod head; the pull rod head is connected with a joint through a pull rod, the joint is connected with a gear shaft, the other end of the gear shaft penetrates into the sliding sleeve, and a second spring is arranged in the sliding sleeve and provides rightward elasticity for the gear shaft; the sliding sleeve is arranged on the back of the door; the right end of the gear shaft is connected with a lock tongue, and a lock hole matched with the lock tongue is formed in the door frame.
Further, an inclined plane deviating from the positioning hole is formed from the free end to the positioning hole on the positioning fixing rod.
Still further, an opening sleeve is arranged on the door, a through hole penetrating through the door is formed in the opening sleeve, and an opening pin is rotatably arranged in the through hole; one end of the opening pin, which is positioned in the door, is provided with a gear which is matched with the gear shaft.
Still further, the door frame is provided with a first pneumatic device fixing seat, and the door is provided with a second pneumatic device fixing seat; one end of the pneumatic device is hinged to the free end of the first pneumatic device fixing seat, and the other end of the pneumatic device is hinged to the free end of the second pneumatic device fixing seat.
Still further, the positioning movable rod and the positioning fixed rod are arc-shaped.
Still further, the knuckle bearing is disposed at the back of the door through a first connection seat.
Still further, the spring base and the connecting rod are disposed at the back of the door through a second connecting seat.
Still further, the connecting rod is L-like.
Compared with the prior art, the invention has the following beneficial technical effects:
when the door needs to be opened, the wrench is downwards pulled, the other end of the wrench moves upwards, the button rod moves upwards, the connecting rod is driven to rotate clockwise, the pull rod head moves leftwards, the pull rod head pulls the joint leftwards through the pull rod, and meanwhile, the gear shaft and the lock tongue are driven to move leftwards, so that the lock tongue is separated from the lock hole, the fixation is released, the door can be pushed upwards to be opened, and the operation is simple and reliable; when the door is pushed upwards, the pneumatic device can provide power, so that the door opening strength is reduced; when the door is turned up, the positioning pin can slide into the positioning hole of the positioning fixing rod, so that the door can not be automatically closed, and the door can be closed only by pulling the positioning pin outwards, so that the safety is high; the invention realizes opening, positioning and closing by mechanical structure, has no power supply and reduces the risk coefficient.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a schematic view of a security evacuation door according to the present invention;
FIG. 2 is a schematic view of the structure of the security evacuation door of the present invention;
FIG. 3 is an enlarged view of the portion "I" of FIG. 1;
FIG. 4 is an enlarged view of the portion "II" of FIG. 1;
FIG. 5 is an enlarged view of "A" in FIG. 2;
reference numerals illustrate: 1. a door frame; 2. a door; 3. a pneumatic device; 4. positioning the movable rod; 5. positioning a fixed rod; 6. a positioning spring; 7. a positioning pin; 8. positioning holes; 9. a knuckle bearing; 10. a wrench; 11. a push button lever; 12. a spring base; 13. a first spring; 14. a connecting rod; 15. a pull rod head; 16. a pull rod; 17. a joint; 18. a gear shaft; 19. a sliding sleeve; 20. a second spring; 21. a bolt; 22. a lock hole; 23. opening the sleeve; 24. a through hole; 25. an opening pin; 26. a gear; 27. a first pneumatic device fixing seat; 28. a second pneumatic device holder; 29. a first connection base; 30. and the second connecting seat.
Detailed Description
As shown in fig. 1, one specific embodiment of a safety evacuation door comprises a door frame 1 installed on an escape passage opening in construction of a large underground square, wherein the door frame 1 is hinged with a door 2, so that the door frame 1 can be turned up along a hinged edge.
A pneumatic device 3 for pushing the door 2 to open is arranged between the door frame 1 and the door 2, so that the door is more labor-saving when being turned upwards. More specifically, a first pneumatic device fixing seat 27 is welded and fixed on the door frame 1, and a second pneumatic device fixing seat 28 is mounted on the door 2 through bolts; one end of the pneumatic device 3 is hinged to the free end of the first pneumatic device fixing seat 27, the other end of the pneumatic device is hinged to the free end of the second pneumatic device fixing seat 28, when the door is turned up, one end of the pneumatic device is supported on the first pneumatic device fixing seat 27, and the other end of the pneumatic device jacks up the door by jacking up the second pneumatic device fixing seat 28.
As shown in fig. 2, a positioning movable rod 4 is welded at one end of the door 2 close to the hinge, a positioning fixed rod 5 matched with the positioning movable rod 4 is welded on the door frame 1, the positioning movable rod 4 and the positioning fixed rod 5 are arc-shaped, and when the door is turned up, the positioning movable rod 4 moves relatively along the positioning fixed rod 5. The free end of the positioning movable rod 4 is provided with a positioning pin 7 through a positioning spring 6, the positioning spring 6 presses the positioning pin 7 towards the positioning fixed rod 5, the positioning fixed rod 5 is provided with a positioning hole 8, when the door is turned up, the positioning pin slides on the positioning fixed rod until entering the positioning hole to form positioning, and the door is prevented from being automatically closed under the action of gravity or external force after being opened upwards. More specifically, the inclined plane which is biased to the positioning hole 8 is arranged on the positioning and fixing rod 5 from the free end to the position of the positioning hole 8, so that the process of sliding the positioning pin on the positioning and fixing rod and entering the positioning hole is smoother.
As shown in fig. 3 and 4, the door 2 is further provided with a knuckle bearing 9, a wrench 10, a button rod 11, a spring base 12, a first spring 13, a connecting rod 14 and a tie rod head 15. The knuckle bearing 9 is mounted on the back of the door 2, more specifically the first connection seat 29 on which the knuckle bearing 9 is mounted, is mounted on the back of the door 2. The middle part of the wrench 10 is clamped at the top end of the joint bearing 9, the end head is hinged with a button rod 11, the other end of the button rod 11 is inserted into the spring base 12, the spring base 12 is arranged on the back surface of the door 2, the first spring 13 is arranged between the bottom of the button rod 11 and the bottom of the spring base 12, and downward elasticity of the button rod 11 is provided. Specifically, the spring mount 12 is mounted on the back of the door 2 by a second connection mount 30. The connecting rod 14 is L-like, the middle part of the connecting rod 14 is hinged on the second connecting seat, one end of the connecting rod is connected with the bottom of the button rod 11 through a bolt, and the other end of the connecting rod is hinged with the pull rod head 15, so that the up-and-down motion of the button rod 11 is converted into the left-and-right motion of the pull rod head 15. The pull rod head 15 is connected with a pull rod 16, the other end of the pull rod is connected with a joint 17, the joint 17 is connected with a gear shaft 18, the other end of the gear shaft 18 penetrates into a sliding sleeve 19, and the sliding sleeve 19 is arranged on the back of the door 2. Since the left side of the door is hinged in this embodiment, the right side of the door is turned up, the gear shaft 18 has a boss, and a second spring 20 is installed between the boss and the left side of the sliding sleeve 19, to provide the right elasticity of the gear shaft 18. The right end of the gear shaft 18 is provided with a lock tongue 21, the door frame 1 is provided with a lock hole 22 matched with the lock tongue 21, and the lock tongue is inserted into the lock hole to fix the door and the door frame to achieve a tightly closed state. When the door needs to be opened, the spanner is pulled downwards, the other end of the spanner moves upwards, the button rod moves upwards, the connecting rod is driven to rotate clockwise, the pull rod head is driven to move leftwards, the pull rod head pulls the joint leftwards through the pull rod, and meanwhile, the gear shaft and the lock tongue are driven to move leftwards, so that the lock tongue is separated from the lock hole, the fixation is released, and the door can be pushed upwards to be opened. After the door is opened, the locating pin moves into the locating hole to locate the opening position of the door, and after the information is released, the locating pin is pulled out again to close the door outside and lock the door lock.
As shown in fig. 4 and 5, in order to prevent the door from being opened from the inside of the door, an opening sleeve 23 is mounted on the door 2, a through hole 24 penetrating the door 2 is formed in the opening sleeve 23, and an opening pin 25 is mounted in the through hole 24 so that the opening pin can rotate in the through hole. The opening pin 25 is fixed with the gear 26 through the flat key at one end in the door 2, so that the gear can rotate synchronously with the opening pin, the gear 26 is matched with the gear shaft 18, when the door cannot or can not be opened by a person, the opening pin is inserted into a hole in the outer side of the door by using a stress application rod and the like, the opening pin is driven to rotate, the gear shaft is driven to move leftwards through the meshing of the gear and the gear shaft, and the lock tongue is driven to be separated from the lock hole, so that the door can be opened from the outer side.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A safe evacuation door, characterized in that: comprises a door frame (1) and a door (2) hinged on the door frame (1);
a pneumatic device (3) for pushing the door (2) to open is arranged between the door frame (1) and the door (2);
a positioning movable rod (4) is arranged at one end, close to the hinge joint, of the door (2), and a positioning fixed rod (5) matched with the positioning movable rod (4) is arranged on the door frame (1); the free end of the positioning movable rod (4) is provided with a positioning pin (7) through a positioning spring (6), and the positioning spring (6) presses the positioning pin (7) to the positioning fixed rod (5); a positioning hole (8) is formed in the positioning fixing rod (5);
the door (2) is also provided with a joint bearing (9), a spanner (10), a button rod (11), a spring base (12), a first spring (13), a connecting rod (14) and a pull rod head (15); the knuckle bearing (9) is arranged on the back of the door (2); the middle part of the wrench (10) is arranged at the top end of the knuckle bearing (9), and the end head is hinged with a button rod (11); the button rod (11) is inserted into the spring base (12), and the spring base (12) is arranged on the back surface of the door (2); the first spring (13) is arranged between the bottom of the button rod (11) and the bottom of the spring base (12) to provide downward elasticity for the button rod (11); the middle part of the connecting rod (14) is rotatably arranged on the back of the door (2), one end of the connecting rod is connected with the bottom of the button rod (11), and the other end of the connecting rod is hinged with the pull rod head (15) to convert the up-and-down motion of the button rod (11) into the left-and-right motion of the pull rod head (15); the pull rod head (15) is connected with a joint (17) through a pull rod (16), the joint (17) is connected with a gear shaft (18), the other end of the gear shaft (18) penetrates into a sliding sleeve (19), and a second spring (20) is arranged in the sliding sleeve (19) to provide rightward elasticity for the gear shaft (18); the sliding sleeve (19) is arranged on the back of the door (2); the right end of the gear shaft (18) is connected with a lock tongue (21), and the door frame (1) is provided with a lock hole (22) matched with the lock tongue (21);
an inclined plane which deviates to the positioning hole (8) is arranged from the free end to the positioning hole (8) on the positioning fixing rod (5);
an opening sleeve (23) is arranged on the door (2), a through hole (24) penetrating through the door (2) is formed in the opening sleeve (23), and an opening pin (25) is rotatably arranged in the through hole (24); one end of the opening pin (25) positioned in the door (2) is provided with a gear (26), and the gear (26) is matched with the gear shaft (18).
2. A security evacuation door according to claim 1, wherein: the door frame (1) is provided with a first pneumatic device fixing seat (27), and the door (2) is provided with a second pneumatic device fixing seat (28); one end of the pneumatic device (3) is hinged to the free end of the first pneumatic device fixing seat (27), and the other end of the pneumatic device is hinged to the free end of the second pneumatic device fixing seat (28).
3. A security evacuation door according to claim 1, wherein: the positioning movable rod (4) and the positioning fixed rod (5) are arc-shaped.
4. A security evacuation door according to claim 1, wherein: the knuckle bearing (9) is arranged on the back of the door (2) through a first connecting seat (29).
5. A security evacuation door according to claim 1, wherein: the spring base (12) and the connecting rod (14) are arranged on the back of the door (2) through a second connecting seat (30).
6. A security evacuation door according to claim 5, wherein: the connecting rod (14) is L-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710355720.3A CN107035281B (en) | 2017-05-19 | 2017-05-19 | Safety evacuation door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710355720.3A CN107035281B (en) | 2017-05-19 | 2017-05-19 | Safety evacuation door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107035281A CN107035281A (en) | 2017-08-11 |
| CN107035281B true CN107035281B (en) | 2023-05-12 |
Family
ID=59538976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710355720.3A Active CN107035281B (en) | 2017-05-19 | 2017-05-19 | Safety evacuation door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107035281B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107780783B (en) * | 2017-12-25 | 2024-07-23 | 北京盈路科技有限责任公司 | Safety door for subway and facilitating evacuation of crowd |
| CN112343462A (en) * | 2020-10-14 | 2021-02-09 | 武汉铁盾民防工程有限公司 | Automatically controlled steel construction biparting protective airtight door |
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| CN2561891Y (en) * | 2002-07-18 | 2003-07-23 | 上田华子 | Lock controller of truck handle |
| JP2006063557A (en) * | 2004-08-25 | 2006-03-09 | Hitoshi Nishitani | Braking device for door |
| EP2101024A2 (en) * | 2008-03-10 | 2009-09-16 | Cebi Srl | Manually operated mechanical release device for electromechanical or oleodynamic actuators used for powering gates or doors with swinging leaves |
| CN202672902U (en) * | 2012-06-21 | 2013-01-16 | 重庆迪马工业有限责任公司 | Outward swinging door lock |
| JP2014159721A (en) * | 2013-02-20 | 2014-09-04 | Hitoshi Nishitani | Closing brake for door |
| CN105625883A (en) * | 2016-03-15 | 2016-06-01 | 中国船舶重工集团公司第七0四研究所 | Upturning type marine fireproof landing door with horizontal hinge |
| CN206707558U (en) * | 2017-05-19 | 2017-12-05 | 涿州市亨吉特机械设备有限公司 | A kind of safe escape door |
Family Cites Families (2)
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|---|---|---|---|---|
| KR100689291B1 (en) * | 2005-05-03 | 2007-03-02 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | an apparatus for rocking and unrocking engine hood door |
| US8844202B2 (en) * | 2011-07-01 | 2014-09-30 | U.S.F. Fabrication, Inc. | Latching mechanism for access door |
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2017
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|---|---|---|---|---|
| CN2561891Y (en) * | 2002-07-18 | 2003-07-23 | 上田华子 | Lock controller of truck handle |
| JP2006063557A (en) * | 2004-08-25 | 2006-03-09 | Hitoshi Nishitani | Braking device for door |
| EP2101024A2 (en) * | 2008-03-10 | 2009-09-16 | Cebi Srl | Manually operated mechanical release device for electromechanical or oleodynamic actuators used for powering gates or doors with swinging leaves |
| CN202672902U (en) * | 2012-06-21 | 2013-01-16 | 重庆迪马工业有限责任公司 | Outward swinging door lock |
| JP2014159721A (en) * | 2013-02-20 | 2014-09-04 | Hitoshi Nishitani | Closing brake for door |
| CN105625883A (en) * | 2016-03-15 | 2016-06-01 | 中国船舶重工集团公司第七0四研究所 | Upturning type marine fireproof landing door with horizontal hinge |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107035281A (en) | 2017-08-11 |
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