CN112502191B - Wellhead wire-protecting device - Google Patents
Wellhead wire-protecting device Download PDFInfo
- Publication number
- CN112502191B CN112502191B CN202011375104.2A CN202011375104A CN112502191B CN 112502191 B CN112502191 B CN 112502191B CN 202011375104 A CN202011375104 A CN 202011375104A CN 112502191 B CN112502191 B CN 112502191B
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- Prior art keywords
- bearing
- wellhead
- wire
- well lid
- box
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1481—Security devices, e.g. indicating unauthorised opening
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of wellhead safety protection, in particular to a wellhead wire-defense device which reduces potential safety hazards of pedestrians, increases the safety of installation and maintenance work, improves the adaptability of the device to inlets with different sizes, increases the operation work efficiency and reduces the use limitation; including general well lid, first bearing, the transmission shaft, initiative conical gear, the mounting bracket, the second bearing, the transmission lead screw, driven conical gear, the location spout, the location slide rail, the support arm, the thread bush, the shielded box, fortune horse wheel, the chamber door, the hinge, the lock, the mounting panel, the pneumatic cylinder, battery and switch starter, first bearing cooperation is installed inside general well lid centre bore, the transmission shaft is connected with the coaxial cooperation of first bearing, the cooperation of a plurality of second bearings is installed inside the mounting bracket through-hole, driven conical gear coaxial arrangement is at the transmission lead screw input, the pneumatic cylinder top is installed respectively in the mounting panel bottom, the battery left end is installed on shielded box cavity left wall.
Description
Technical Field
The invention relates to the technical field of wellhead safety protection, in particular to a wellhead wire-defense device.
Background
As is well known, a wellhead line protection device is a protection device for wellhead protection and fall prevention, and is widely used in the field of wellhead safety protection; present well head wire defense device discovers in using, the inspection shaft is the power supply for city underground infrastructure, the feedwater, the drainage, the communication, the blowdown, gas pipeline etc. is convenient for maintain and be convenient for the installation and set up, the well head is opened in the installation inspection process, the pedestrian does not notice the road conditions, can appear falling into the phenomenon in the inspection shaft, cause the potential safety hazard to pedestrian on the road etc., should be different for the well head size, lead to seeking suitable size interim well lid efficiency lower, lead to the adaptability relatively poor, use the limitation higher.
Disclosure of Invention
In order to solve the technical problems, the invention provides the wellhead wire-preventing device which can reduce the potential safety hazard of pedestrians, increase the safety of installation and maintenance work, improve the adaptability of the device to inlets with different sizes, increase the operation work efficiency and reduce the use limitation.
The invention relates to a wellhead wire-proofing device, which comprises a general well lid, a first bearing, a transmission shaft, a driving bevel gear, an installation frame, a second bearing, a transmission screw rod, a driven bevel gear, a positioning chute, a positioning slide rail, a supporting arm, a thread bushing, an isolation box, a horse wheel, a box door, a hinge, a door lock, an installation plate, a hydraulic cylinder, a storage battery and a switch starter, wherein the first bearing is arranged inside a central shaft hole of the general well lid in a matching way, the transmission shaft is coaxially matched and connected with the first bearing, the top end of the driving bevel gear is coaxially arranged at the bottom end of the transmission shaft, the top end of the installation frame is arranged in the middle of the bottom end of the first bearing, a plurality of second bearings are arranged inside through holes of the installation frame in a matching way, the transmission screw rod is coaxially matched and connected with the second bearing, the driven bevel gear is coaxially arranged at the input end of the transmission screw rod, and the driven bevel gears are in meshing transmission connection with the driving bevel gear, a plurality of positioning chutes are uniformly matched and installed inside a slotted hole at the bottom end of the universal well lid, the bottom ends of the positioning chutes are respectively installed at the top end of the support arm, the positioning chutes and the positioning chutes are respectively matched and connected in a sliding manner, the thread sleeves are respectively fixed inside the through grooves of the support arm, the transmission lead screws are respectively connected with the thread sleeves in a threaded manner, a plurality of horseshoe wheels are matched and installed at the bottom end of the isolation box, the front end of the isolation box is provided with an opening, the box door is rotatably connected with the isolation box through a plurality of hinges, the door lock is installed inside a box door fixing groove, the box door and the isolation box opening are fixedly connected through a door lock, a plurality of mounting plates are matched and installed inside the cavity of the isolation box, the top ends of the hydraulic cylinders are respectively installed at the bottom ends of the mounting plates, the top end of the universal well lid is installed at the bottom ends of a plurality of the hydraulic cylinders, the left end of the storage battery is installed at the left wall of the cavity of the isolation box, the front end of the switch starter is installed at the rear end of the box door, and the hydraulic cylinder, The storage battery is electrically communicated with the switch starter through a conducting wire.
The wellhead wire-proofing device also comprises a piston cylinder, a piston slide block, a spring and a support column, wherein the piston slide block is arranged in a piston cylinder working cavity in a matching and sliding mode, the left end of the spring is arranged at the right end of the piston slide block, the right end of the spring is fixed on the right wall of the piston cylinder working cavity, the right end of the support column is fixed at the left end of the piston slide block, and the piston cylinders are respectively fixed on the outer side wall of the support arm.
The wellhead wire-proofing device also comprises a fixing frame and a solar panel, wherein the solar panel is installed at the top end of the isolation box through the fixing frame, and the solar panel is electrically communicated with the storage battery through a wire.
The wellhead wire-defense device also comprises a lamp holder and illuminating lamps, wherein the illuminating lamps are respectively arranged at the top end of the outer wall of the isolation box through the lamp holder, and the illuminating lamps are electrically communicated with the switch starter through a wire.
The wellhead wire-defense device also comprises a hand wheel, wherein the bottom end of the hand wheel is coaxially arranged at the top end of the transmission shaft.
The wellhead wire-proofing device also comprises an anti-collision rubber pad, and the anti-collision rubber pad is installed on the outer wall of the isolation box in a matching manner.
Compared with the prior art, the invention has the beneficial effects that: make the transmission shaft rotate with general well lid through first bearing and be connected, make a plurality of transmission lead screws rotate the support through mounting bracket and second bearing cooperation, the transmission shaft rotates and is connected through initiative conical gear and transmission lead screw meshing transmission and makes a plurality of transmission lead screws provide rotation power, make support arm slidable mounting in general well lid bottom through location spout and location slide rail cooperation, it makes a plurality of support arm intervals carry out synchronous control to be connected with the thread bush screw assembly respectively through transmission lead screw, it is connected with the wall of a well cooperation to make general well lid be connected through a plurality of support arm cooperations, make the import carry out interim shutoff through general well lid, reduce pedestrian's potential safety hazard, increase installation and maintenance work security, the high installation and maintenance improves the device and imports adaptability to not unidimensional, increase operation work efficiency, reduce and use the limitation.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is an enlarged partial schematic view of the present invention;
FIG. 4 is a schematic view of the construction of the components of the present invention;
in the drawings, the reference numbers: 1. a universal well cover; 2. a first bearing; 3. a drive shaft; 4. a driving bevel gear; 5. a mounting frame; 6. a second bearing; 7. a drive screw; 8. a driven bevel gear; 9. positioning the chute; 10. positioning the slide rail; 11. a support arm; 12. a threaded sleeve; 13. an isolation box; 14. a fortune horse wheel; 15. a box door; 16. a hinge; 17. a door lock; 18. mounting a plate; 19. a hydraulic cylinder; 20. a storage battery; 21. a switch starter; 22. a piston cylinder; 23. a piston slide block; 24. a spring; 25. a support pillar; 26. a fixed mount; 27. a solar panel; 28. a lamp socket; 29. an illuminating lamp; 30. a hand wheel; 31. crashproof rubber pad.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the wellhead wire defense device of the invention comprises a general manhole cover 1, a first bearing 2, a transmission shaft 3, a driving bevel gear 4, an installation frame 5, a second bearing 6, a transmission screw rod 7, a driven bevel gear 8, a positioning chute 9, a positioning slide rail 10, a support arm 11, a thread bushing 12, an isolation box 13, a horse wheel 14, a box door 15, a hinge 16, a door lock 17, an installation plate 18, a hydraulic cylinder 19, a storage battery 20 and a switch starter 21, wherein the first bearing 2 is installed inside a central shaft hole of the general manhole cover 1 in a matching way, the transmission shaft 3 is connected with the first bearing 2 in a coaxial matching way, the top end of the driving bevel gear 4 is installed at the bottom end of the transmission shaft 3 in a coaxial way, the top end of the installation frame 5 is installed at the middle part of the bottom end of the first bearing 2, a plurality of second bearings 6 are installed inside through holes of the installation frame 5 in a matching way, and the transmission screw rod 7 is connected with the second bearing 6 in a coaxial matching way, the driven bevel gears 8 are coaxially arranged at the input end of a transmission screw rod 7, a plurality of driven bevel gears 8 are in meshing transmission connection with a driving bevel gear 4, a plurality of positioning chutes 9 are matched and evenly arranged inside a slotted hole at the bottom end of the general well lid 1, the bottom ends of positioning slide rails 10 are respectively arranged at the top end of a supporting arm 11, the positioning slide rails 10 are respectively matched and slidably connected with the positioning chutes 9, threaded sleeves 12 are respectively fixed inside through grooves of the supporting arm 11, the transmission screw rod 7 is respectively in threaded connection with the threaded sleeves 12, the top ends of a plurality of horse wheels 14 are matched and arranged at the bottom end of an isolation box 13, the front end of the isolation box 13 is provided with an opening, the box door 15 is rotatably connected with the isolation box 13 through a plurality of hinges 16, a door lock 17 is arranged inside a fixed groove of the box door 15, the box door 15 is fixedly connected with the opening of the isolation box 13 through a door lock 17, a plurality of mounting plates 18 are matched and arranged inside a cavity of the isolation box 13, the top ends of the hydraulic cylinders 19 are respectively installed at the bottom ends of the installation plates 18, the top ends of the universal well covers 1 are installed at the bottom ends of the hydraulic cylinders 19, the left end of the storage battery 20 is installed on the left wall of the cavity of the isolation box 13, the front end of the switch starter 21 is installed at the rear end of the box door 15, and the hydraulic cylinders 19, the storage battery 20 and the switch starter 21 are electrically communicated through conducting wires; the transmission shaft 3 is rotatably connected with the universal well lid 1 through a first bearing 2, the transmission screws 7 are rotatably supported through the matching of a mounting rack 5 and a second bearing 6, the transmission shaft 3 rotates and is in meshing transmission connection with the transmission screws 7 through a driving bevel gear 4 so that the transmission screws 7 provide rotating power, the support arms 11 are slidably mounted at the bottom end of the universal well lid 1 through the matching of the positioning sliding grooves 9 and the positioning sliding rails 10, the spaces among the support arms 11 are synchronously adjusted through the screw assembly connection of the transmission screws 7 and the threaded sleeves 12 respectively, the universal well lid 1 is in matching connection with the well wall through the matching of the support arms 11, the inlet is temporarily blocked through the universal well lid 1, pedestrians are warned and blocked through the isolation box 13, the box door 15 is rotatably connected with the isolation box 13 through the matching of a plurality of hinges 16, and the universal well lid 1 is convenient to move and carry through the matching of a plurality of fortune horse wheels 14, make chamber door 15 rotate the locking control through lock 17, make 19 fixed mounting of a plurality of pneumatic cylinders inside 1 cavity of general well lid through mounting panel 18, make the device carry out the electric quantity supply and reduce and use the place limitation through battery 20, control pneumatic cylinder 19 through switch starter 21, make 1 operating height of general well lid adjust through control pneumatic cylinder 19, reduce pedestrian's potential safety hazard, increase installation and overhaul work security, improve the device and import adaptability to not unidimensional, increase operation work efficiency, reduce and use the limitation.
The wellhead wire-defense device also comprises a piston cylinder 22, a piston slide block 23, a spring 24 and a support column 25, wherein the piston slide block 23 is arranged in a working cavity of the piston cylinder 22 in a matched and sliding manner, the left end of the spring 24 is arranged at the right end of the piston slide block 23, the right end of the spring 24 is fixed on the right wall of the working cavity of the piston cylinder 22, the right end of the support column 25 is fixed at the left end of the piston slide block 23, and the piston cylinders 22 are respectively fixed on the outer side wall of the support arm 11; make a plurality of support arms 11 and the tight stability of clamp increase through spring 24 and support column 25, cooperate through piston cylinder 22 and piston slide 23 to make spring 24 and support column 25 activity orbit carry on spacingly, improve device clamping stability, increase the convenience of use, reduce and use the limitation.
The wellhead wire-defense device further comprises a fixing frame 26 and a solar panel 27, wherein the solar panel 27 is installed at the top end of the isolation box 13 through the fixing frame 26, and the solar panel 27 is electrically communicated with the storage battery 20 through a wire; make solar panel 27 stable installation on isolation box 13 top through mount 26, make solar energy transformation for the electric energy through solar panel 27, increase the device and use duration, improve resource utilization, reduce the regional limitation of device use.
The wellhead wire-defense device further comprises a lamp holder 28 and a plurality of illuminating lamps 29, wherein the illuminating lamps 29 are respectively arranged at the top end of the outer wall of the isolation box 13 through the lamp holder 28, and the illuminating lamps 29 are electrically communicated with the switch starter 21 through a wire; make a plurality of light 29 and shielded box 13 stable installations respectively through lamp stand 28, make shielded box 13 surrounding environment throw light on through light 29, reduce dim environment because the sight does not cause the injury to the pedestrian well, increase device function variety, improve the adaptation convenience, increase job stabilization nature.
The wellhead wire-defense device further comprises a hand wheel 30, wherein the bottom end of the hand wheel 30 is coaxially arranged at the top end of the transmission shaft 3; make transmission shaft 3 rotate the convenience through hand wheel 30 and increase, improve device regulation efficiency, increase operation adaptability, reduce and use the limitation.
The wellhead wire-defense device further comprises an anti-collision rubber pad 31, wherein the anti-collision rubber pad 31 is installed on the outer wall of the isolation box 13 in a matched mode; make the device carry out collision protection through crashproof rubber pad 31, reduce the damage that causes when the collision takes place, improve device life, reduce the collision harm.
When the wellhead wire-defense device works, the device is supported by the plurality of Fuma wheels 14 to move to the top end of a wellhead, then the idler wheels are locked by the wheel locks, then the hydraulic cylinder 19 is started by the switch starter 21 to enable the position of the universal manhole cover 1 to descend and cover the top end of the wellhead, then the hand wheel 30 is rotated to enable the driving bevel gear 4 and the driven bevel gear 8 to be matched to push the plurality of supporting arms 11 to be tightly matched with a wall of a well, and then the door 15 and the opening of the universal manhole cover 1 are tightly closed through the door lock 17.
According to the wellhead wire-preventing device, the installation mode, the connection mode or the arrangement mode are common mechanical modes, and the wellhead wire-preventing device can be implemented as long as the beneficial effects of the wellhead wire-preventing device can be achieved; the hydraulic cylinder 19, the storage battery 20, the switch starter 21 and the solar panel 27 of the wellhead wire-protecting device are purchased from the market, and technicians in the industry only need to install and operate the wellhead wire-protecting device according to the attached operating instructions.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A wellhead wire-defense device is characterized by comprising a general well lid (1), a first bearing (2), a transmission shaft (3), a driving bevel gear (4), a mounting rack (5), a second bearing (6), a transmission screw rod (7), a driven bevel gear (8), a positioning chute (9), a positioning slide rail (10), a support arm (11), a thread bush (12), an isolation box (13), a horseback wheel (14), a box door (15), a hinge (16), a door lock (17), a mounting plate (18), a hydraulic cylinder (19), a storage battery (20) and a switch starter (21), wherein the first bearing (2) is arranged inside a central shaft hole of the general well lid (1) in a matching way, the transmission shaft (3) is connected with the first bearing (2) in a coaxial matching way, the top end of the driving bevel gear (4) is coaxially arranged at the bottom end of the transmission shaft (3), the top end of the mounting rack (5) is arranged in the middle of the bottom end of the first bearing (2), a plurality of second bearings (6) are arranged inside through holes of the mounting frame (5) in a matching way, the transmission screw rod (7) is connected with the second bearings (6) in a coaxial matching way, the driven bevel gears (8) are arranged at the input end of the transmission screw rod (7) in a coaxial way, the driven bevel gears (8) are in meshing transmission connection with the driving bevel gear (4), a plurality of positioning chutes (9) are arranged inside slotted holes at the bottom end of the universal well lid (1) in a matching way and in an equal way, the bottom ends of the positioning slide rails (10) are respectively arranged at the top end of the supporting arm (11), the positioning slide rails (10) are respectively in matching sliding connection with the positioning chutes (9), threaded sleeves (12) are respectively fixed inside through grooves of the supporting arm (11), the transmission screw rod (7) is respectively in threaded connection with the threaded sleeves (12), the top ends of the plurality of the Frouma wheels (14) are arranged at the bottom end of the isolation box (13), and the front end of the isolation box (13) is provided with an opening, chamber door (15) are rotated through a plurality of hinges (16) and are connected with separator box (13), door lock (17) are installed inside chamber door (15) fixed slot, and chamber door (15) and separator box (13) opening pass through door lock (17) fixed connection, a plurality of mounting panels (18) cooperation are installed on separator box (13) cavity is inside, install mounting panel (18) bottom respectively on pneumatic cylinder (19) top, install on a plurality of pneumatic cylinders (19) bottom on general well lid (1) top, install on separator box (13) cavity left wall battery (20) left end, install at chamber door (15) rear end switch starter (21) front end, and pneumatic cylinder (19), battery (20) and switch starter (21) pass through wire electric property intercommunication.
2. A wellhead wire-protecting device according to claim 1, characterized by further comprising a piston cylinder (22), a piston slider (23), a spring (24) and a supporting column (25), wherein the piston slider (23) is slidably mounted inside the working cavity of the piston cylinder (22) in a matching manner, the left end of the spring (24) is mounted at the right end of the piston slider (23), the right end of the spring (24) is fixed on the right wall of the working cavity of the piston cylinder (22), the right end of the supporting column (25) is fixed at the left end of the piston slider (23), and the piston cylinders (22) are respectively fixed on the outer side wall of the supporting arm (11).
3. A wellhead line protection device as claimed in claim 2, further comprising a fixing frame (26) and a solar panel (27), wherein the solar panel (27) is mounted on the top end of the isolation box (13) through the fixing frame (26), and the solar panel (27) is electrically communicated with the storage battery (20) through a wire.
4. A wellhead wire-protecting device as claimed in claim 3, characterized by further comprising a lamp holder (28) and a plurality of illuminating lamps (29), wherein the plurality of illuminating lamps (29) are respectively mounted on the top end of the outer wall of the isolation box (13) through the lamp holder (28), and the plurality of illuminating lamps (29) are electrically communicated with the switch starter (21) through wires.
5. A wellhead line protection device according to claim 4, characterized by further comprising a hand wheel (30), wherein the bottom end of the hand wheel (30) is coaxially arranged on the top end of the transmission shaft (3).
6. A wellhead line protection device as claimed in claim 5, characterized by further comprising a rubber cushion (31), wherein the rubber cushion (31) is fittingly mounted on the outer wall of the isolation box (13).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202011375104.2A CN112502191B (en) | 2020-11-30 | 2020-11-30 | Wellhead wire-protecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202011375104.2A CN112502191B (en) | 2020-11-30 | 2020-11-30 | Wellhead wire-protecting device |
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CN112502191A CN112502191A (en) | 2021-03-16 |
CN112502191B true CN112502191B (en) | 2022-08-09 |
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CN202011375104.2A Active CN112502191B (en) | 2020-11-30 | 2020-11-30 | Wellhead wire-protecting device |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1434241A (en) * | 1972-04-21 | 1976-05-05 | Larsson F | Adjustable manhole frame |
CN109826236A (en) * | 2019-04-01 | 2019-05-31 | 河南传通电子科技有限公司 | A kind of adjustable protection well lid being arranged in hoistway |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN203049615U (en) * | 2012-12-04 | 2013-07-10 | 中建五局土木工程有限公司 | Well bore protection device |
CN205259224U (en) * | 2015-11-11 | 2016-05-25 | 鄢海军 | Type well lid that abrasionproof is withstand voltage |
EP3231945A1 (en) * | 2016-04-15 | 2017-10-18 | Bernard Bleurvacq | Manhole for underground network |
CN107487745B (en) * | 2017-07-10 | 2019-10-29 | 林驰杰 | A kind of communication engineering construction well lid extraction element |
CN110357010A (en) * | 2019-06-21 | 2019-10-22 | 张曼玉 | A kind of municipal administration adjustable manhole lid device of operation |
CN210621767U (en) * | 2019-08-23 | 2020-05-26 | 怀来原野绿化维护有限公司 | Municipal administration road well lid laying device that drains |
CN210917473U (en) * | 2019-09-27 | 2020-07-03 | 江苏移山科技股份有限公司 | Square well lid with strong anti-theft capability |
CN111425001B (en) * | 2020-04-06 | 2021-10-26 | 张栋宁 | Safety protection casing is used in municipal works road construction |
-
2020
- 2020-11-30 CN CN202011375104.2A patent/CN112502191B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1434241A (en) * | 1972-04-21 | 1976-05-05 | Larsson F | Adjustable manhole frame |
CN109826236A (en) * | 2019-04-01 | 2019-05-31 | 河南传通电子科技有限公司 | A kind of adjustable protection well lid being arranged in hoistway |
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CN112502191A (en) | 2021-03-16 |
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