CN217152010U - A prevent wind electronic throttle for reverse locking in colliery - Google Patents

A prevent wind electronic throttle for reverse locking in colliery Download PDF

Info

Publication number
CN217152010U
CN217152010U CN202221194102.8U CN202221194102U CN217152010U CN 217152010 U CN217152010 U CN 217152010U CN 202221194102 U CN202221194102 U CN 202221194102U CN 217152010 U CN217152010 U CN 217152010U
Authority
CN
China
Prior art keywords
door
wind
windproof
door frame
proof
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.)
Expired - Fee Related
Application number
CN202221194102.8U
Other languages
Chinese (zh)
Inventor
吴勋杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202221194102.8U priority Critical patent/CN217152010U/en
Application granted granted Critical
Publication of CN217152010U publication Critical patent/CN217152010U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The utility model discloses a prevent wind electronic air door for reverse locking in colliery relates to the colliery and prevents wind door technical field, include: the door frame, the front side of door frame is provided with fixed mouthful, the symmetry slides in the fixed mouthful and is provided with two windproof door plant, and two one side that windproof door plant is relative offsets, the front side of windproof door plant is provided with the buffer board, two grooves of accomodating have been seted up to door frame's inside symmetry, windproof door plant and the inslot of accomodating groove cooperation sliding connection of accomodating. The utility model discloses in, solved current colliery and prevent wind the door in the pit and because of the manual opening of most needs manual work, lead to the switch to prevent wind the door problem that wastes time and energy, realized intelligent recognition personnel and the effect of the windproof door plant that opens and shuts by oneself, solved simultaneously current coal cinder prevent wind the door in the pit because of mostly not possessing the anticollision function, lead to the door plant to warp easily and appear the problem of leaking wind and leaking gas, realized the effect with the effective buffering of external force striking.

Description

A prevent wind electronic throttle for reverse locking in colliery
Technical Field
The utility model relates to a door technical field is prevent wind in the colliery, especially relates to a prevent wind electron air door for reverse locking in colliery.
Background
When the colliery need be excavated, just need install in the mine and prevent suddenly the air door, prevent suddenly the air door and can prevent that poisonous and harmful gas from getting into the mine, protect staff's health safety, prevent suddenly the air door and be exactly the door that can play isolated effect when preventing suddenly the working face and take place gas disaster, prevent that the disaster scope from expanding.
For inserting cable or oxygen route, generally can be provided with the through wires hole on the anti-burst air door, the cable inserts the back, and the gap has been inevitable between through wires hole and the cable, if not fill the gap, toxic gas can get into the inside of anti-burst air door through the gap to influence mine safety in production and cause hidden danger in the pit, the current door body is under blowing of headwind, and the door body is difficult to open.
The prior patent (publication number: CN214787501U) discloses an anti-air leakage device for an underground coal mine anti-sudden air door, which can drive a door body on a rotating rod to rotate by utilizing the meshing connection of a worm wheel and a worm through arranging the worm wheel and the worm, further, the door body is enabled to rotate and be opened, the problem that the door body is difficult to open due to the fact that the door body is pushed by headwind is avoided, through arranging a telescopic rod and the worm, a sealing gasket at one end of the telescopic rod can be driven to vertically move by utilizing the meshing connection of the telescopic rod and the gear, gaps can be filled in the sealing gasket, the sealing gasket is tightly attached to a cable, the air leakage phenomenon is avoided, through arranging two arc-shaped sealing gaskets, the two arc-shaped sealing gaskets form an annular sealing ring and are attached to the surface of the cable, and the sealing effect is achieved.
However, the anti-air leakage device for the coal mine underground anti-sudden air door has some defects in practical application: according to the colliery of above-mentioned design prevents the unable automatic door body of opening of abrupt air door in the pit, make personnel when the body of needs business turn over, need manually to unblank and open the door, it is comparatively troublesome, and the colliery of above-mentioned design prevents the abrupt air door in the pit still does not have crashproof function, because staff probably need carry machine or heavy part in the pit, if not set up crashproof function, then make machine or heavy part striking on the door plant easily, or outside great wind-force strikes on the door plant repeatedly, make the door plant warp easily, because the door plant chooses for use for most does not possess elastic rigidity material, and then make the door plant of deformation can't recover and the phenomenon of leaking out, and poison gas infiltration warp the door plant gap and get into inside still can harm the staff, there is great potential safety hazard, for this reason, we have designed a windproof electron air door for the reverse locking of colliery.
SUMMERY OF THE UTILITY MODEL
The utility model provides a prevent wind electronic air door for reverse locking in colliery has solved current colliery and has prevent wind the door in the pit because of the artifical manual opening of most needs, leads to the switch to prevent wind the problem that the door wastes time and energy, has solved simultaneously current coal cinder and has prevented wind the door in the pit because of the most not possess the anticollision function, leads to the door plant to warp easily and the problem that leaks out gas leakage appears.
In order to solve the technical problem, the utility model provides a pair of a prevent wind electron air door for reverse locking in colliery, include: the microwave radar door comprises a door frame, wherein a fixed opening is formed in the front side of the door frame, two windproof door plates are symmetrically and slidably arranged in the fixed opening, opposite sides of the two windproof door plates are abutted, a buffer plate is arranged on the front side of the windproof door plates, two accommodating grooves are symmetrically formed in the door frame, the windproof door plates and the accommodating grooves are matched and slidably connected in the accommodating grooves, a first microwave radar detector is arranged on the front side of the buffer plate, a transmission mechanism is arranged in the door frame, and the transmission mechanism is used for transmitting displacement to the windproof door plates;
the transmission mechanism comprises two threaded lead screws, two nuts, two driving motors and two sliding ports, two installation cavities are symmetrically arranged in the door frame, the two threaded lead screws are respectively and rotatably connected into the two installation cavities, the two nuts are respectively in threaded sleeve connection with the two threaded lead screws, two cavities are symmetrically arranged in the door frame, the two driving motors are respectively arranged in the two cavities, a driving shaft of each driving motor is in transmission connection with one end of each threaded lead screw, the two sliding ports are symmetrically arranged in the door frame, a transmission part is arranged at the bottom of each nut and is in sliding connection with the corresponding sliding port, the other end of each transmission part is fixedly connected with one side of the windproof door plate, and the first microwave radar detector is electrically connected with the driving motors;
through setting up first microwave radar detector, can be by oneself the measurement personnel to conveniently open driving motor, make prevent wind the door plant and slide in accomodating the inslot, only open single windproof door plant through the single, reducible problem of leaking out has solved current colliery and has prevent wind the door in the pit and because of the artifical manual opening of most needs, lead to the switch to prevent wind the problem that the door wastes time and energy, has realized intelligent recognition personnel and the effect of opening and shutting the windproof door plant by oneself.
Preferably, the wind-proof door further comprises two anti-collision mechanisms, the two anti-collision mechanisms are respectively arranged in two wind-proof door plates and are used for buffering wind power or external hard object impact, each anti-collision mechanism comprises two installation seats, two rotating pieces, two sliding blocks, two fixed seats and two buffer springs, a sliding groove is arranged on the front side of each wind-proof door plate, the buffer plates are connected in the sliding groove in a sliding manner, two fixing grooves are symmetrically formed in the wind-proof door plates, the two installation seats are symmetrically arranged on one side of the buffer plate, the two rotating pieces are respectively and rotatably connected in the two installation seats, the two sliding blocks are respectively and slidably connected in the two fixing grooves, the two fixed seats are respectively arranged on one side of the two sliding blocks, the other side of each rotating piece is rotatably connected in the fixed seats, the two buffer springs are respectively arranged on the opposite sides of the two sliding blocks, the other end of the buffer spring is arranged in the fixing groove;
a limiting rod is inserted in the sliding block, and two ends of the limiting rod are arranged in the fixing grooves;
a first pin shaft is arranged in the mounting seat, a second pin shaft is arranged in the fixed seat, one side of the rotating part is rotatably sleeved on the first pin shaft, and the other side of the rotating part is rotatably sleeved on the second pin shaft;
when external wind power or hardness striking buffer board, the buffer board slided to the spout this moment to make the slider slide and compress buffer spring, can cushion the impact, solved current coal cinder door of preventing wind in the pit because of mostly not possessing the anticollision function, lead to the door plant to warp easily and the problem of leaking out the gas leakage appears, realized the effect with the effective buffering of external force striking.
Preferably, the buffer plate is made of high-carbon steel, the thickness of the buffer plate is 10mm, and the high-carbon steel has high strength, so that the service life of the buffer plate can be prolonged.
Preferably, the buffer spring is made of 304 stainless steel, so that the corrosion rate of the buffer spring is effectively delayed, and the service life of the buffer spring is prolonged.
Preferably, be provided with second microwave radar detector in the fixed mouthful, second microwave radar detector and driving motor electric connection can prevent that personnel from preventing the problem that the door board started by oneself and pressed from both sides wounded personnel when totally getting into fixed mouthful in, have improved the security.
Preferably, two blocking pieces are arranged in the installation cavity, the blocking pieces are matched and abutted with the nuts, the moving distance of the nuts can be limited, when the nuts abut against the blocking pieces positioned on the left side, the windproof door plate is just positioned in the accommodating groove, and when the nuts abut against the blocking pieces positioned on the right side, the two windproof door plates abut against each other just at the moment and are used for preventing wind.
Compared with the prior art, the utility model provides a pair of a prevent wind electronic throttle for reverse locking in colliery has following beneficial effect:
1. the utility model discloses in, through setting up first microwave radar detector, can be by oneself the measurement personnel, thereby conveniently open driving motor, make prevent wind the door plant and slide into and accomodate the inslot, only open single windproof door plant through the single, reducible problem of leaking out, solved current colliery and prevent wind the door in the pit and because of the artifical manual opening of most needs, lead to the switch to prevent wind the problem that the door is wasted time and energy, the effect of intelligent recognition personnel and the windproof door plant of opening and shutting by oneself has been realized, through setting up second microwave radar detector, can prevent that personnel prevent wind the door plant and start the problem of pressing from both sides wounded personnel by oneself when not getting into the fixed orifices completely, and the security is improved.
2. The utility model discloses in, when external wind-force or hardness striking buffer board, the buffer board slides to the spout this moment to make the slider slide and compress buffer spring, the attenuator in the spout is installed in the cooperation, can cushion the impact, has solved current coal cinder and has prevented wind the door in the pit and because of mostly not possessing crashproof function, leads to the door plant to warp easily and the problem of air leakage appears, has realized the effect with the effective buffering of external force striking.
Drawings
FIG. 1 is a schematic perspective view of the exterior of a reversibly lockable wind-resistant electronic damper for use in a coal mine;
FIG. 2 is a schematic plan view of the interior of a reverse locking wind resistant electric damper installation cavity for a coal mine;
FIG. 3 is a schematic side view of an interior portion of a wind-resistant door panel of a reversibly lockable wind-resistant electronic damper for use in a coal mine;
fig. 4 is an enlarged view of a portion a in fig. 2.
Reference numbers in the figures: 1. a door frame; 2. a fixed port; 3. a wind-proof door panel; 4. a buffer plate; 5. a first microwave radar detector; 6. a receiving groove; 7. a threaded lead screw; 8. a nut; 9. a drive motor; 10. a sliding port; 11. a mounting seat; 12. a rotating member; 13. a slider; 14. a fixed seat; 15. a buffer spring; 16. a second microwave radar detector.
Detailed Description
In a first embodiment, illustrated in fig. 1-4, a reversibly lockable electronic damper for use in a coal mine, comprising: the door comprises a door frame 1, wherein a fixed opening 2 is arranged on the front side of the door frame 1, two windproof door plates 3 are symmetrically and slidably arranged in the fixed opening 2, opposite sides of the two windproof door plates 3 are abutted, a buffer plate 4 is arranged on the front side of the windproof door plates 3, two accommodating grooves 6 are symmetrically arranged in the door frame 1, the windproof door plates 3 and the accommodating grooves 6 are matched and slidably connected in the accommodating grooves 6, a first microwave radar detector 5 is arranged on the front side of the buffer plate 4, a transmission mechanism is arranged in the door frame 1 and used for transmitting displacement to the windproof door plates 3;
the transmission mechanism comprises two threaded lead screws 7, two nuts 8, two driving motors 9 and two sliding ports 10, two installation cavities are symmetrically arranged inside the door frame 1, the two threaded lead screws 7 are respectively and rotatably connected into the two installation cavities, the two nuts 8 are respectively in threaded sleeve connection with the two threaded lead screws 7, two cavities are symmetrically arranged inside the door frame 1, the two driving motors 9 are respectively arranged in the two cavities, a driving shaft of each driving motor 9 is in transmission connection with one end of each threaded lead screw 7, the two sliding ports 10 are symmetrically arranged in the door frame 1, a transmission part is arranged at the bottom of each nut 8 and is in sliding connection with the corresponding sliding port 10, the other end of each transmission part is fixedly connected with one side of the windproof door plate 3, and the first microwave radar detector 5 is electrically connected with the driving motors 9;
a second microwave radar detector 16 is arranged in the fixed port 2, and the second microwave radar detector 16 is electrically connected with the driving motor 9;
at first personnel walk the front side of one of them buffer board 4, first microwave radar detector 5 detects the object and removes and discover personnel this moment, then first microwave radar detector 5 with signal feedback and open driving motor 9, make the screw lead screw 7 that corresponds rotate, make nut 8 drive the driving medium and prevent wind door plant 3 slip and accomodate the groove 6 in, personnel can pass fixed mouthful 2 entering afterwards, when personnel pass fixed mouthful 2 completely, second microwave radar detector 16 can not detect the object and remove this moment, control driving motor 9's drive shaft reversal after 3 seconds, make wind door plant 3 drive buffer board 4 reset according to the principle and block up fixed mouthful 2, if the flow of people is great, second microwave radar detector 16 detects the object and removes, then can't close wind door plant 3.
In the second embodiment, on the basis of the first embodiment, the wind-proof door further comprises two anti-collision mechanisms, the two anti-collision mechanisms are respectively arranged in the two wind-proof door plates 3 and are used for buffering wind power or external hard object impact, each anti-collision mechanism comprises two installation bases 11, two rotating pieces 12, two sliding blocks 13, two fixed bases 14 and two buffer springs 15, a sliding groove is arranged on the front side of each wind-proof door plate 3, the buffer plates 4 are slidably connected in the sliding groove, two fixing grooves are symmetrically formed in the wind-proof door plates 3, the two installation bases 11 are symmetrically arranged on one side of the buffer plates 4, the two rotating pieces 12 are respectively rotatably connected in the two installation bases 11, the two sliding blocks 13 are respectively slidably connected in the two fixing grooves, the two fixed bases 14 are respectively arranged on one side of the two sliding blocks 13, the other side of the rotating pieces 12 is rotatably connected in the fixed bases 14, the two buffer springs 15 are respectively arranged on the opposite sides of the two sliding blocks 13, and the other end of the buffer spring 15 is arranged in the fixed groove;
the buffer plate 4 is made of high-carbon steel, and the thickness of the buffer plate 4 is 10 mm;
a limiting rod is inserted in the sliding block 13, and two ends of the limiting rod are arranged in the fixing grooves;
a first pin shaft is arranged in the mounting seat 11, a second pin shaft is arranged in the fixed seat 14, one side of the rotating part 12 is rotatably sleeved on the first pin shaft, and the other side of the rotating part 12 is rotatably sleeved on the second pin shaft;
at first powerful wind-force or external hard thing striking 4 surfaces of buffer board, buffer board 4 slides to spout inside afterwards, and two rotation pieces 12 limit in this process are rotated the limit and are promoted slider 13 and slide and compress buffer spring 15 in the fixed slot, and until external impact power consumption is totally up, buffer spring 15 makes buffer board 4 reset because of self elasticity afterwards, reciprocates so can avoid windproof door plant 3 to warp because of external force striking.
In the third embodiment, on the basis of the second embodiment, the buffer spring 15 is made of 304 stainless steel, so that the corrosion rate of the buffer spring 15 is effectively delayed, and the service life of the buffer spring 15 is prolonged.
Fourth embodiment, on the basis of first embodiment, be provided with two in the installation cavity and keep off the piece, keep off the piece and cooperate with nut 8 and offset, can be spacing to the distance that nut 8 removed, when nut 8 offsets with keeping off the piece that is located the left side, the windproof door plant 3 just is located and accomodates groove 6 this moment, when nut 8 offsets with keeping off the piece that is located the right side, two windproof door plants 3 just offset this moment for prevent wind.
The working principle is as follows:
when needed:
the first step is as follows: firstly, a person walks to the front side of one of the buffer plates 4, the first microwave radar detector 5 detects the movement of an object to find the person, then the first microwave radar detector 5 feeds back a signal and starts the driving motor 9 to rotate the corresponding threaded lead screw 7, so that the nut 8 drives the transmission part and the windproof door plate 3 to slide into the accommodating groove 6, and then the person can enter through the fixing port 2;
the second step is that: when personnel passed fixed mouthful 2 completely, second microwave radar detector 16 can't detect the object and remove this moment, and 3 seconds back control driving motor 9's drive shaft reversal makes windproof door plant 3 drive buffer board 4 and resets according to the principle and block up fixed mouthful 2, and if when the flow of people was great, second microwave radar detector 16 detected the object and removed, then can't close windproof door plant 3.
When the buffer plate 4 needs to buffer the external impact:
at first powerful wind-force or external hard thing striking 4 surfaces of buffer board, buffer board 4 slides to spout inside afterwards, and two rotation pieces 12 limit in this process are rotated the limit and are promoted slider 13 and slide and compress buffer spring 15 in the fixed slot, and until external impact power consumption is totally up, buffer spring 15 makes buffer board 4 reset because of self elasticity afterwards, reciprocates so can avoid windproof door plant 3 to warp because of external force striking.

Claims (8)

1. A wind resistant electronic damper for reverse locking in a coal mine, comprising: the door frame (1) is characterized in that a fixing opening (2) is formed in the front side of the door frame (1), two windproof door plates (3) are symmetrically and slidably arranged in the fixing opening (2), opposite sides of the two windproof door plates (3) are abutted, a buffer plate (4) is arranged on the front side of each windproof door plate (3), two accommodating grooves (6) are symmetrically formed in the door frame (1), the windproof door plates (3) are matched with the accommodating grooves (6) and slidably connected in the accommodating grooves (6), a first microwave radar detector (5) is arranged on the front side of the buffer plate (4), a transmission mechanism is arranged in the door frame (1), and the transmission mechanism is used for transmitting the windproof door plates (3) to move;
the transmission mechanism comprises two threaded screw rods (7), two nuts (8), two driving motors (9) and two sliding ports (10), two installation cavities are symmetrically arranged in the door frame (1), the two threaded screw rods (7) are respectively and rotatably connected in the two installation cavities, the two nuts (8) are respectively in threaded sleeve connection with the two threaded screw rods (7), two cavities are symmetrically arranged in the door frame (1), the two driving motors (9) are respectively arranged in the two cavities, a driving shaft of each driving motor (9) is in transmission connection with one end of each threaded screw rod (7), the two sliding ports (10) are symmetrically arranged in the door frame (1), a transmission member is arranged at the bottom of each nut (8) and is in sliding connection with the corresponding sliding port (10), and the other end of the transmission member is fixedly connected with one side of the windproof door plate (3), the first microwave radar detector (5) is electrically connected with the driving motor (9).
2. The wind-proof electronic air door for the reverse locking of the coal mine according to claim 1, characterized in that, it further comprises two anti-collision mechanisms, the two anti-collision mechanisms are respectively arranged in the two wind-proof door panels (3), the anti-collision mechanisms are used for buffering wind power or external hard object impact, the anti-collision mechanisms comprise two installation seats (11), two rotating pieces (12), two sliding blocks (13), two fixed seats (14) and two buffer springs (15), the front side of the wind-proof door panel (3) is provided with a sliding groove, the buffer plate (4) is slidably connected in the sliding groove, the wind-proof door panel (3) is symmetrically provided with two fixed grooves, the two installation seats (11) are symmetrically arranged at one side of the buffer plate (4), the two rotating pieces (12) are respectively rotatably connected in the two installation seats (11), the two sliding blocks (13) are respectively slidably connected in the two fixed grooves, two fixing base (14) set up respectively in one side of two slider (13), just the opposite side of rotating piece (12) is rotated and is connected in fixing base (14), two buffer spring (15) set up respectively in the one side that two slider (13) carried on the back mutually, just buffer spring (15) the other end sets up in the fixed slot.
3. The wind-proof electric damper for the reverse locking of the coal mine as claimed in claim 1, wherein the material of the buffer plate (4) is high carbon steel, and the thickness of the buffer plate (4) is 10 mm.
4. The wind-proof electronic air door for the reverse locking of the coal mine as claimed in claim 2, wherein a limiting rod is inserted in the sliding block (13), and two ends of the limiting rod are arranged in the fixing grooves.
5. The wind-proof electronic air door for the reverse locking of the coal mine according to claim 2, wherein a first pin is arranged in the mounting seat (11), a second pin is arranged in the fixed seat (14), one side of the rotating member (12) is rotatably sleeved on the first pin, and the other side of the rotating member (12) is rotatably sleeved on the second pin.
6. The wind-proof electric damper for coal mine reversal locking according to claim 2, characterized in that the material of the buffer spring (15) is 304 stainless steel.
7. The wind-proof electronic air door for the reverse locking of the coal mine is characterized in that a second microwave radar detector (16) is arranged in the fixing port (2), and the second microwave radar detector (16) is electrically connected with the driving motor (9).
8. The wind-proof electronic air door for the reverse locking of the coal mine as claimed in claim 1, wherein two stoppers are arranged in the mounting cavity, and the stoppers are matched and abutted against the nut (8).
CN202221194102.8U 2022-05-17 2022-05-17 A prevent wind electronic throttle for reverse locking in colliery Expired - Fee Related CN217152010U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221194102.8U CN217152010U (en) 2022-05-17 2022-05-17 A prevent wind electronic throttle for reverse locking in colliery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221194102.8U CN217152010U (en) 2022-05-17 2022-05-17 A prevent wind electronic throttle for reverse locking in colliery

Publications (1)

Publication Number Publication Date
CN217152010U true CN217152010U (en) 2022-08-09

Family

ID=82664941

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221194102.8U Expired - Fee Related CN217152010U (en) 2022-05-17 2022-05-17 A prevent wind electronic throttle for reverse locking in colliery

Country Status (1)

Country Link
CN (1) CN217152010U (en)

Similar Documents

Publication Publication Date Title
US4880046A (en) Door sealing apparatus
CN204069565U (en) A kind of electric equipment protection chamber door
CN217152010U (en) A prevent wind electronic throttle for reverse locking in colliery
CN210738361U (en) Steel construction threshold biparting protective airtight door that lives
CN213654649U (en) Rotatable civil air defense door
CN110777739B (en) Water conservancy is gate for water and electricity with safety protection function
CN210598741U (en) Sealing device of civil air defense door
CN210013574U (en) Sealing structure for outdoor intelligent lock
CN218376164U (en) Sealed effectual people's air defense door
CN112796832A (en) Safety door for subway shield tunnel contact channel construction
CN215718072U (en) High-airtight civil air defense door for subway
CN220815434U (en) Valve threshold double-leaf protective airtight door structure
CN213634793U (en) Geological disaster early warning device
CN209267480U (en) A kind of mine flameproof and intrinsic safety type vacuum electromagnetic starter
CN216553451U (en) Rotary telescopic cabin door locking device
CN220732058U (en) Combined switch control device
CN211974778U (en) Protective airtight door device
CN217233238U (en) Fireproof protective airtight door convenient to install
CN218029643U (en) Self-locking-proof civil air defense door
CN219004059U (en) Display terminal for coal mine safety monitoring
CN209670497U (en) Door lock handle automatic rotary structure
CN215443773U (en) Fireproof, smoke-proof and waterproof civil air defense door with waterlogging prevention and drainage structure
CN214659738U (en) Steel construction people's air defense door
CN216665465U (en) Sealing structure for security door
CN204113049U (en) Explosion proof door

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20220809