CN108005554B - Lifting type electromagnetic shielding door with safety self-locking device - Google Patents
Lifting type electromagnetic shielding door with safety self-locking device Download PDFInfo
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- CN108005554B CN108005554B CN201711460018.XA CN201711460018A CN108005554B CN 108005554 B CN108005554 B CN 108005554B CN 201711460018 A CN201711460018 A CN 201711460018A CN 108005554 B CN108005554 B CN 108005554B
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- assembly
- sliding body
- subassembly
- lifting
- door
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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
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/18—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against harmful radiation
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D13/00—Accessories for sliding or lifting wings, e.g. pulleys, safety catches
- E05D13/003—Anti-dropping devices
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D15/00—Suspension arrangements for wings
- E05D15/16—Suspension arrangements for wings for wings sliding vertically more or less in their own plane
- E05D15/165—Details, e.g. sliding or rolling guides
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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
- E05F15/57—Power-operated mechanisms for wings using fluid-pressure actuators for vertically-sliding wings
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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
- 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
- E06B3/42—Sliding wings; Details of frames with respect to guiding
- E06B3/44—Vertically-sliding wings
- E06B3/4407—Single-hung, i.e. having a single vertical sliding panel
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
The invention discloses a lifting type electromagnetic shielding door with a safe self-locking device, which comprises a door frame assembly, a door leaf assembly, a longitudinal feeding mechanism and a lifting mechanism, wherein the door frame assembly and the door leaf assembly are mutually matched to realize the locking and the opening of the door leaf assembly, the door leaf assembly is arranged on the longitudinal feeding mechanism, the longitudinal feeding mechanism drives the door leaf assembly to perform translational motion, the lifting mechanism comprises a stand column assembly and a sliding body assembly capable of sliding up and down relative to the stand column assembly, the longitudinal feeding mechanism is arranged on the sliding body assembly, and the sliding body assembly drives the longitudinal feeding mechanism and the door leaf assembly to perform lifting motion. The invention abandons the structure that the steel wire rope controls the lifting, adopts the lifting mechanism that the upright post component and the sliding body component are matched, and installs the safe self-locking device on the upright post component, so that a mechanical lock is formed when the power is off, and the falling of the shielding door is prevented.
Description
Technical Field
The invention relates to a lifting type electromagnetic shielding door with a safety self-locking device, and belongs to the technical field of electromagnetic shielding.
Background
In recent years, darkroom and simulation technologies are widely applied with the implementation of the national mandatory standards for electromagnetic compatibility of electronic information and electrical industry products. The size of a measured object required by the system is larger and larger, the measured object is smaller than a computer and larger than an aerospace vehicle, so that a door required by shielding engineering is also large in size, and the door is required to be subjected to longitudinal feeding movement in translation due to the fact that wave-absorbing materials need to be adhered to the inner side of the door. To meet the above requirements, guide rail suspended type translation shield doors have emerged. However, some users are limited by the plane space, and the translation cannot be realized, so that the requirement of upward lifting is provided.
The existing lifting type electromagnetic shielding door mainly adopts a structure that a motor drives a steel wire rope to control lifting. However, the steel wire rope has the problems of strand breakage and abrasion, and potential safety hazards of rapid falling of the shielding door after the steel wire rope is broken exist when the shielding door rises or hovers. In addition, when the motor breaks down or has power failure, the shielding door in a lifting state cannot descend, and subsequent work is affected.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the lifting type electromagnetic shielding door with the safety self-locking device has the advantages that the defects of the prior art are overcome, the lifting type electromagnetic shielding door with the safety self-locking device is provided, the structure that a steel wire rope controls lifting is abandoned, the falling hidden danger during failure or power failure is eliminated, the occupied space is small, the lifting amplitude is large, the operation is safe, and the maintenance is convenient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the lifting type electromagnetic shielding door with the safety self-locking device comprises a door frame assembly, a door leaf assembly, a longitudinal feeding mechanism and a lifting mechanism, wherein the door frame assembly and the door leaf assembly are matched with each other to realize locking and opening of the door leaf assembly, the door leaf assembly is installed on the longitudinal feeding mechanism, the longitudinal feeding mechanism drives the door leaf assembly to perform translation motion, the lifting mechanism comprises a stand column assembly and a sliding body assembly capable of sliding up and down relative to the stand column assembly, and the longitudinal feeding mechanism is installed on the sliding body assembly and drives the longitudinal feeding mechanism to perform lifting motion with the door leaf assembly through the sliding body assembly.
Furthermore, the stand subassembly on be provided with the stand cavity, the sliding body unit mount is in the stand cavity and can follow the stand cavity slides from top to bottom, hoist mechanism still includes the lifting cylinder, the sliding body subassembly is driven by the lifting cylinder and is gone up and down.
Further, the lift cylinder is fixed on the stand subassembly that corresponds, is equipped with the sprocket on the piston rod of lift cylinder, hoist mechanism still includes board-like chain, board-like chain and sprocket cooperation, and, the one end fixed connection of board-like chain is on the stand subassembly, the other end and the sliding body subassembly of board-like chain are connected, lift cylinder, sprocket and board-like chain form the movable pulley structure jointly, accomplish the lift action, make the stroke of lift cylinder is 1 with the ratio of sliding body subassembly stroke: 2.
furthermore, a plurality of square clamping grooves are formed in the sliding body assembly from top to bottom, a safety self-locking device is mounted on the stand column assembly and comprises a locking block, a torsion spring, a rotating shaft, a connecting rod and an electromagnet, the electromagnet is fixedly connected to the stand column assembly through a mounting bracket, the locking block is mounted on the stand column assembly through the rotating shaft and can perform rotary motion around the rotating shaft, the torsion spring is mounted on the rotating shaft, and the locking block is connected with the electromagnet through the connecting rod; when the sliding body assembly suspends, the electromagnet is not electrified, and the locking block is always inserted into the square clamping groove under the action of the torsion spring to form a mechanical lock.
Furthermore, the stand subassembly includes left stand subassembly and right stand subassembly, connect through a crossbeam between left side stand subassembly and the right stand subassembly, respectively set up a sliding body subassembly on the left and right stand subassembly, every sliding body subassembly is by corresponding the movable pulley structure drives and accomplishes the lift action, all is provided with safe self-lock device on the left and right stand subassembly, and the latch segment inserts in the square draw-in groove that corresponds sliding body subassembly.
Furthermore, take safe self-lock device's promotion formula electromagnetic shield door still includes the hydraulic pressure station for promoting the hydro-cylinder and provide power, and the hydraulic pressure station drives the lift hydro-cylinder synchronous lift on left stand subassembly and the right stand subassembly.
Furthermore, an unloading valve is also arranged on an oil return section of a hydraulic passage formed by the hydraulic station and the lifting oil cylinder, so that the lifting oil cylinder can be released manually, and the lifting oil cylinder can descend.
After the technical scheme is adopted, the invention has the following beneficial effects:
1) The lifting mechanism abandons a structure of controlling lifting by a steel wire rope, adopts a lifting mechanism with an upright post component and a sliding body component matched with each other, and the sliding body component lifts and slides on the upright post component, so that the sliding body component drives a longitudinal feeding mechanism to lift with a door leaf component;
2) The sliding body assembly is driven by a movable pulley structure formed by a lifting oil cylinder, a chain wheel and a plate type chain together to complete lifting action, and the lifting range of the sliding body assembly is large by adopting the movable pulley structure;
3) The sliding body assembly is provided with the safety self-locking device, when the sliding body assembly is suspended, the electromagnet is not electrified, the locking block is always inserted into the square clamping groove under the action of the torsion spring to form a mechanical lock, and the shielding door is prevented from falling when hovering; when the sliding body assembly ascends, the electromagnet is not electrified, the sliding body assembly upwards presses the locking block to enable the locking block to upwards rotate until the locking block is separated from the square clamping groove, and the locking block is inserted into the next square clamping groove under the action of the torsion spring, so that the risk of falling is also eliminated when the shielding door ascends; when the sliding body assembly descends, the electromagnet is electrified and contracted, the connecting rod is pulled downwards by the electromagnet, the locking block is separated from the square clamping groove under the pulling of the connecting rod, and when the electromagnet is electrified, the locking block is always separated from the square clamping groove;
4) The lifting oil cylinders on the left and right upright post assemblies can be synchronously lifted and lowered by providing power for the lifting oil cylinders through the hydraulic station, and the unloading valve is installed at the oil return section of the hydraulic passage, so that the door leaf assembly can be lowered to the lowest position when power is cut off, and maintenance or other work is facilitated.
Drawings
Fig. 1 is a structural diagram of a lifting type electromagnetic shielding door with a safety self-locking device according to the invention;
FIG. 2 is a structural view of the lifting mechanism of the present invention (partially cut away at the square frame);
FIG. 3 is a structural diagram of the safety self-locking device of the present invention;
in the figure, 1, a door frame component, 2, a door leaf component, 3, a longitudinal feeding mechanism, 4, a lifting mechanism, 5, a left upright post component, 6, a right upright post component, 7, a cross beam, 8, an upright post cavity, 9 and a lifting oil cylinder, 10, a sliding body assembly, 11, a plate type chain, 12, a hydraulic station, 13, a safety self-locking device, 14, a locking block, 15, a torsion spring, 16, an electromagnet, 17, a square clamping groove, 18, a connecting rod, 19, a rotating shaft, 20 and a mounting bracket.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, a lifting type electromagnetic shielding door with a safety self-locking device includes a door frame assembly 1, a door leaf assembly 2, a longitudinal feeding mechanism 3 and a lifting mechanism 4, wherein the door frame assembly 1 and the door leaf assembly 2 are mutually matched to lock and open the door leaf assembly 2, the door leaf assembly 2 is installed on the longitudinal feeding mechanism 3, the longitudinal feeding mechanism 3 drives the door leaf assembly 2 to perform a translational motion, the lifting mechanism 4 includes a column assembly and a sliding body assembly 10 capable of sliding up and down relative to the column assembly, the longitudinal feeding mechanism 3 is installed on the sliding body assembly 10, and the sliding body assembly 10 drives the longitudinal feeding mechanism 3 to perform a lifting motion with the door leaf assembly 2.
Preferably, as shown in the figure, the column assembly on be provided with column cavity 8, sliding body subassembly 10 is installed in column cavity 8 and can follow column cavity 8 slides from top to bottom, hoist mechanism 4 still includes lift cylinder 9, sliding body subassembly 10 is driven by lift cylinder 9 and is gone up and down.
Preferably, as shown in the figure, lift cylinder 9 is fixed on the stand subassembly that corresponds, is equipped with the sprocket on lift cylinder 9's the piston rod, hoist mechanism 4 still includes board-like chain 11, board-like chain 11 and sprocket cooperation, and, the one end fixed connection of board-like chain 11 is on the stand subassembly, the other end and the sliding body subassembly 10 of board-like chain 11 are connected, lift cylinder 9, sprocket and board-like chain 11 form the movable pulley structure jointly, accomplish the lift action, make the stroke of lift cylinder 9 is 1 with the ratio of sliding body subassembly 10 stroke: 2.
preferably, as shown in the figure, a plurality of square clamping grooves 17 are formed in the sliding body assembly 10 from top to bottom, a safety self-locking device 13 is further installed on the stand column assembly, the safety self-locking device 13 comprises a locking block 14, a torsion spring 15, a rotating shaft 19, a connecting rod 18 and an electromagnet 16, the electromagnet 16 is fixedly connected to the stand column assembly through a mounting bracket 20, the locking block 14 is installed on the stand column assembly through the rotating shaft 19, the locking block 14 can rotate around the rotating shaft 19, the torsion spring 15 is installed on the rotating shaft 19, and the locking block 14 is connected with the electromagnet 16 through the connecting rod 18; when the sliding body assembly 10 suspends, the electromagnet 16 is not electrified, and the locking block 14 is always inserted into the square clamping groove 17 under the action of the torsion spring 15, so that a mechanical lock is formed.
Preferably, as shown in the figure, the stand subassembly includes left stand subassembly 5 and right stand subassembly 6, connect through a crossbeam 7 between left side stand subassembly 5 and the right stand subassembly 6, respectively set up a sliding body subassembly 10 on the left and right stand subassembly, every sliding body subassembly 10 is by corresponding the movable pulley structure drives and accomplishes the lift action, all is provided with safe self-lock device 13 on the left and right stand subassembly, and latch segment 14 inserts in the square draw-in groove 17 that corresponds sliding body subassembly 10. The three-dimensional subassembly of this embodiment adopts left stand subassembly 5 and right stand subassembly 6's structure, has increased the reliability that door leaf subassembly 2 goes up and down, and door leaf subassembly 2 drives the lift by controlling two sliding mass subassemblies 10 jointly.
Preferably, as shown in the figure, the lifting type electromagnetic shielding door with the safety self-locking device further comprises a hydraulic station 12 for providing power for the lifting oil cylinder 9, and the hydraulic station 12 drives the lifting oil cylinders 9 on the left upright post assembly 5 and the right upright post assembly 6 to synchronously lift.
Preferably, as shown in the figure, an unloading valve is further installed on the oil return section of the hydraulic passage formed by the hydraulic station 12 and the lift cylinder 9, so as to manually release the pressure of the lift cylinder 9 and lower the lift cylinder 9.
The invention abandons the structure that the steel wire rope controls the lifting, adopts the lifting mechanism that the upright post component is matched with the sliding body component 10, and the sliding body component 10 lifts and slides on the upright post component, so that the sliding body component 10 drives the longitudinal feeding mechanism 3 and the door leaf component 2 to lift.
The sliding body assembly 10 is driven by a movable pulley structure formed by the lifting oil cylinder 9, the chain wheel and the plate type chain 11 together to complete lifting action, and the lifting range of the sliding body assembly is large due to the adoption of the movable pulley structure.
A safety self-locking device is arranged on the upright post assembly, when the sliding body assembly 10 suspends, the electromagnet 16 is not electrified, the locking block 14 is always inserted into the square clamping groove 17 under the action of the torsion spring 15 to form a mechanical lock, and the shielding door is prevented from falling when hovering; when the sliding body assembly 10 ascends, the electromagnet 16 is not electrified, the sliding body assembly 10 upwards presses the locking block 14, the locking block 14 upwards rotates until the locking block 14 is separated from the square clamping groove 17, and the locking block 14 is inserted into the next square clamping groove 17 under the action of the torsion spring 15, so that the risk of falling is eliminated when the shielding door ascends; when the sliding body assembly 10 descends, the electromagnet 16 is electrified and contracted, the connecting rod 18 is pulled downwards by the electromagnet 16, the locking block 14 is separated from the square clamping groove 17 under the pulling of the connecting rod 18, and when the electromagnet 16 is electrified, the locking block 14 is always separated from the square clamping groove 17.
The hydraulic station 12 provides power for the lifting oil cylinders, the lifting oil cylinders 9 on the left and right upright post assemblies can be ensured to synchronously lift, and the unloading valve is arranged at the oil return section of the hydraulic passage, so that the door leaf assembly can be lowered to the lowest position when power is off, and maintenance or other work is facilitated.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a take safe self-lock device's promotion formula electromagnetic shield door which characterized in that: the door frame assembly (1) is matched with the door leaf assembly (2) to lock and open the door leaf assembly (2), the door leaf assembly (2) is installed on the longitudinal feeding mechanism (3), the longitudinal feeding mechanism (3) drives the door leaf assembly (2) to perform translation motion, the lifting mechanism (4) comprises a stand column assembly and a sliding body assembly (10) capable of sliding up and down relative to the stand column assembly, the longitudinal feeding mechanism (3) is installed on the sliding body assembly (10), and the sliding body assembly (10) drives the longitudinal feeding mechanism (3) to perform lifting motion with the door leaf assembly (2);
the sliding body assembly (10) is provided with a plurality of square clamping grooves (17) from top to bottom, the stand column assembly is further provided with a safety self-locking device (13), the safety self-locking device (13) comprises a locking block (14), a torsion spring (15), a rotating shaft (19), a connecting rod (18) and an electromagnet (16), the electromagnet (16) is fixedly connected to the stand column assembly through a mounting bracket (20), the locking block (14) is mounted on the stand column assembly through the rotating shaft (19), the locking block (14) can rotate around the rotating shaft (19), the torsion spring (15) is mounted on the rotating shaft (19), and the locking block (14) is connected with the electromagnet (16) through the connecting rod (18); when the sliding body assembly (10) is suspended, the electromagnet (16) is not electrified, and the locking block (14) is always inserted into the square clamping groove (17) under the action force of the torsion spring (15) to form a mechanical lock; when the sliding body assembly (10) rises, the electromagnet (16) is not electrified, the sliding body assembly (10) upwards presses the locking block (14) to enable the locking block (14) to upwards rotate until the locking block (14) is separated from the square clamping groove (17), and the locking block (14) is inserted into the next square clamping groove (17) under the action force of the torsion spring (15).
2. The lift type electromagnetic shielding door with the safety self-locking device according to claim 1, wherein: the lifting mechanism is characterized in that a stand column cavity (8) is arranged on the stand column assembly, a sliding body assembly (10) is installed in the stand column cavity (8) and can slide up and down along the stand column cavity (8), the lifting mechanism (4) further comprises a lifting oil cylinder (9), and the sliding body assembly (10) is driven to lift by the lifting oil cylinder (9).
3. The lift type electromagnetic shielding door with the safety self-locking device according to claim 2, wherein: hoist cylinder (9) are fixed on the stand subassembly that corresponds, are equipped with the sprocket on the piston rod of hoist cylinder (9), hoist mechanism (4) still include board-like chain (11), board-like chain (11) and sprocket cooperation, and, the one end fixed connection of board-like chain (11) is on the stand subassembly, the other end and the sliding body subassembly (10) of board-like chain (11) are connected, hoist cylinder (9), sprocket and board-like chain (11) form the movable pulley structure jointly, accomplish the lift action, make the stroke of hoist cylinder (9) is 1 with the ratio of sliding body subassembly (10) stroke: 2.
4. the lift type electromagnetic shielding door with the safety self-locking device according to claim 3, wherein: the stand subassembly includes left stand subassembly (5) and right stand subassembly (6), connect through a crossbeam (7) between left side stand subassembly (5) and the right stand subassembly (6), respectively set up a gliding mass subassembly (10) on the left and right stand subassembly, every gliding mass subassembly (10) is by corresponding the movable pulley structure drives and accomplishes the lift action, all is provided with safe self-lock device (13) on the left and right stand subassembly, and latch segment (14) insert in square draw-in groove (17) that correspond gliding mass subassembly (10).
5. The lift type electromagnetic shielding door with the safety self-locking device according to claim 4, wherein: the lifting type electromagnetic shielding door with the safety self-locking device further comprises a hydraulic station (12) for providing power for the lifting oil cylinder (9), and the hydraulic station (12) drives the lifting oil cylinder (9) on the left upright post assembly (5) and the right upright post assembly (6) to synchronously lift.
6. The lift type electromagnetic shielding door with the safety self-locking device according to claim 5, wherein: an unloading valve is further mounted on an oil return section of a hydraulic passage formed by the hydraulic station (12) and the lifting oil cylinder (9) so that the lifting oil cylinder (9) can be manually relieved in pressure to enable the lifting oil cylinder (9) to descend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460018.XA CN108005554B (en) | 2017-12-28 | 2017-12-28 | Lifting type electromagnetic shielding door with safety self-locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460018.XA CN108005554B (en) | 2017-12-28 | 2017-12-28 | Lifting type electromagnetic shielding door with safety self-locking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108005554A CN108005554A (en) | 2018-05-08 |
| CN108005554B true CN108005554B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711460018.XA Active CN108005554B (en) | 2017-12-28 | 2017-12-28 | Lifting type electromagnetic shielding door with safety self-locking device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11951610B2 (en) | 2018-07-31 | 2024-04-09 | Mjnn Llc | Opening apparatus for use with a multi-piece, hinged, hydroponic tower |
| CN108661479A (en) * | 2018-08-23 | 2018-10-16 | 长春福然德部件加工有限公司 | Overhead door anti-fall device |
| US11723328B2 (en) | 2019-05-08 | 2023-08-15 | Mjnn Llc | Cleaning apparatus for use with a plant support tower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101434671B1 (en) * | 2007-12-10 | 2014-08-27 | 두산인프라코어 주식회사 | Apparatus for opening and closing autodoor |
| CN202207653U (en) * | 2011-08-26 | 2012-05-02 | 上海洲泰轻工机械制造有限公司 | Observation window opening and closing mechanism for combination machine |
| CN206600105U (en) * | 2016-12-21 | 2017-10-31 | 纪和机械制造(上海)有限公司 | Automatically-controlled door |
| CN107234093B (en) * | 2017-08-03 | 2022-09-16 | 练学红 | Door closing mechanism of hydrocarbon cleaning machine |
| CN208073312U (en) * | 2017-12-28 | 2018-11-09 | 常州雷宁电磁屏蔽设备有限公司 | Hoisting type electromagnetic shield door with foolproof apparatus |
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