CN210239410U - Civil air defense door convenient to use - Google Patents
Civil air defense door convenient to use Download PDFInfo
- Publication number
- CN210239410U CN210239410U CN201822154166.5U CN201822154166U CN210239410U CN 210239410 U CN210239410 U CN 210239410U CN 201822154166 U CN201822154166 U CN 201822154166U CN 210239410 U CN210239410 U CN 210239410U
- Authority
- CN
- China
- Prior art keywords
- door body
- door
- bolt
- connecting point
- air defense
- 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.)
- Active
Links
Images
Landscapes
- Wing Frames And Configurations (AREA)
Abstract
The utility model relates to a convenient-to-use civil air defense door, which relates to the field of civil air defense equipment and comprises a door body and a door frame rotationally connected with the door body, wherein the inner side of the door body is symmetrically provided with connecting rod assemblies along the vertical central axis of the door body, each connecting rod assembly comprises a driving block, a central axis extends towards the central position of the driving block from the door body, and the driving block rotates along the central axis; the two ends of the driving block are respectively provided with a first connecting point and a second connecting point, the first connecting point is rotatably connected with one action rod, the second connecting point is rotatably connected with the other action rod, and the ends of the two connecting rods, which are far away from the connecting points, are respectively provided with a bolt inserted into the door frame; when the middle shaft, the first connecting point and the second connecting point are positioned on the same vertical line, the door body is fixed in the door frame; when the middle shaft, the first connecting point and the second connecting point are on the same horizontal line, the door body rotates along the door frame. The utility model discloses have the long-time normal use's of realization people's air defense door effect.
Description
Technical Field
The utility model belongs to the technical field of the technique of people's air defense equipment and specifically relates to a people's air defense door that facilitates use is related to.
Background
At present, civil defense is also called civil defense, which is an international common word and is an activity that governments mobilize and organize the masses, take measures of air attack prevention, disaster resistance and relief, implement rescue actions and prevent and reduce disaster harm. People's air defense door belongs to civil defense protective equipment.
The utility model discloses a current application number is CN 201620066897.2's chinese utility model, this utility model discloses a people's air defense door, its main technical scheme main points include door plant, link assembly, bolt, hand wheel and carousel, hand wheel and door plant rotate to be connected, the bolt is installed on the door plant and is connected with the carousel through link assembly, the door plant on install the lifting rope and be convenient for the hand wheel pass through the drive mechanism of lifting rope drive carousel, the carousel is connected with drive mechanism, the lifting rope walks around drive mechanism and both ends respectively with drive mechanism, hand wheel connection.
The above prior art solutions have the following drawbacks: the transmission mechanism is lifted through the lifting rope, and the lifting rope is easy to wear and break after being used for a long time, so that the civil air defense door cannot be normally used.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a people's air defense door that facilitates use can realize the long-time normal use of people's air defense door.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a convenient civil air defense door comprises a door body and a door frame rotationally connected with the door body, wherein connecting rod assemblies are symmetrically arranged on the inner side of the door body along a vertical central shaft of the door body, each connecting rod assembly comprises a driving block, a central shaft extends towards the center of the driving block from the door body, and the driving block rotates along the central shaft; the two ends of the driving block are respectively provided with a first connecting point and a second connecting point, the first connecting point is rotatably connected with one action rod, the second connecting point is rotatably connected with the other action rod, and one ends of the two action rods, which are far away from the corresponding connecting points, are respectively provided with a bolt inserted into the door frame; when the middle shaft, the first connecting point and the second connecting point are positioned on the same vertical line, the door body is fixed in the door frame; when the middle shaft, the first connecting point and the second connecting point are on the same horizontal line, the door body rotates along the door frame.
By adopting the technical scheme, when the door body needs to be closed, the action rods connected with the first connecting point and the second connecting point are respectively driven, the driving block is enabled to rotate around the central shaft, and finally the central shaft, the first connecting point and the second connecting point are located on the same vertical line, and the bolt on the action rod is inserted into the door frame, so that the door body is fixed in the door frame, and the closing of the civil defense door is realized; when the door body needs to be opened, the middle shaft, the first connecting point and the second connecting point are located on the same horizontal line, and the bolt on the action rod is far away from the door frame, so that the opening of the civil air defense door is realized.
The utility model discloses further set up to: the door body is also provided with a driving assembly, the driving assembly comprises a pair of mutually vertical bevel gears arranged on the inner side of the door body, a protective shell is arranged outside the bevel gears, a lead screw penetrates through the horizontally arranged bevel gears, and the vertical bevel gears are rotationally connected with a rotating wheel arranged on one side of the door body, which is far away from the driving assembly, through a driving rod; the lead screw is provided with a sliding block which slides along the lead screw, the two sides of the sliding block can be detachably connected with a connecting rod, and the connecting rod is rotatably connected with the driving block.
By adopting the technical scheme, the bevel gear is driven to rotate through the driving rod, the lead screw is driven to rotate by the bevel gear, then the sliding block slides up and down along the lead screw, the driving block is driven to rotate through the connecting rod, and then the driving block drives the connected action rod to act, so that the civil air defense door is opened and closed.
The utility model discloses further set up to: the upper portion and the lower part of the door body are provided with guide structures used for guiding the bolt, and the guide structures comprise fixed blocks used for being fixed on the door body and guide sleeves used for guiding the bolt.
Through adopting above-mentioned technical scheme, when the bolt moved, the bolt moved along the guide sleeve to make the bolt can be accurate insert in the door frame.
The utility model discloses further set up to: the door frame bottom is equipped with the threshold, be equipped with the bolt hole that the cooperation bolt used on the threshold, the bolt hole is square.
The utility model discloses further set up to: the bolt is trapezoidal, the direction through-hole cooperation bolt also is trapezoidal.
The utility model discloses further set up to: the outer surface of the bolt is provided with a bean jumping spring, and the guide sleeve is internally provided with a limiting hole matched with the bean jumping spring.
Through adopting above-mentioned technical scheme, after the bolt breaks away from the bolt downthehole along guide sleeve, inject the hole and will jump beans spring card and decide to make the bolt at guide sleeve internal fixation, avoid the bolt to receive the action of gravity to fall back and influence normal use.
The utility model discloses further set up to: the side of the door body provided with the rotating wheel is provided with a handle.
The utility model discloses further set up to: the action bars all are equipped with the regulation structure with the junction of bolt, adjust the structure and include adjusting sleeve, adjusting sleeve keeps away from the one end of action bars and is equipped with the engaging lug of dismantling the connection with the bolt, action bars cooperation adjusting sleeve is equipped with the diameter and is less than the joint of action bars, connect and can dismantle with adjusting sleeve and be connected.
Through adopting above-mentioned technical scheme, adjust and connect and adjusting sleeve, make the connecting rod can adapt to the door body of different specifications, enlarged accommodation.
To sum up, the utility model discloses a beneficial technological effect does:
1. the door body is conveniently fixed in the door frame by arranging the connecting rod assembly;
2. by arranging the adjusting structure, the connecting rod assembly can adapt to door bodies of different specifications, and the application range is expanded;
3. through setting up trapezoidal bolt and jumping the beans spring, can avoid the bolt to receive self action of gravity and whereabouts, facilitate the use.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a door frame.
Fig. 3 is a schematic structural view of the bevel gear.
Fig. 4 is a schematic structural diagram of the first embodiment.
Fig. 5 is a partially enlarged view of the structure at a in fig. 4.
Fig. 6 is a partially enlarged view of the structure at B in fig. 4.
Fig. 7 is a partially enlarged view of the structure at C in fig. 4.
Fig. 8 is a schematic structural diagram of the second embodiment.
FIG. 9 is a partial enlarged view of the structure at D in FIG. 8
Reference numerals: 1. a door body; 11. a rotating wheel; 12. a drive rod; 13. a handle; 14. a middle shaft; 2. a door frame; 21. a door lintel; 22. a threshold; 221. a lower bolt hole; 23. a door leaf twisting lug; 3. a connecting rod assembly; 31. a drive assembly; 310. a protective shell; 311. a first bevel gear; 312. a second bevel gear; 313. a lead screw; 314. an upper fixed block; 315. a lower fixed block; 316. a guide groove; 317. a slider; 318. a connector; 319. a connecting rod; 32. a lower lever assembly; 321. a drive block; 3211. a first connection point; 3212. a second connection point; 322. a lower actuating lever; 323. a lower bolt; 324. a lower joint; 325. a lower hanging lug; 326. a lower adjustment sleeve; 327. a lower guide sleeve; 328. a lower guide fixing block; 33. an upper rod assembly; 331. an upper actuating lever; 332. an upper bolt; 333. an upper joint; 334. hanging a lug; 335. an upper adjustment sleeve; 336. an upper guide sleeve; 337. and an upper guide fixing block.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example one
Referring to fig. 1 and 2, for the convenient civil air defense door disclosed by the utility model, the convenient civil air defense door comprises a door body 1 with a reinforced concrete door core and a door frame 2 rotationally connected with the door body 1 through a door leaf hinge lug 23, wherein the door frame comprises a door lintel 21 and a door sill 22; one side of the door body 1 is provided with a connecting rod assembly 3 (refer to fig. 3 and 4) for fixing the door body 1 in a door frame 21, the other side of the door body 1 is provided with a rotating wheel 11 for driving the connecting rod assembly 3 to move, the rotating wheel 11 is rotatably connected with the connecting rod assembly 3 through a driving rod 12, and one side of the door body 1 provided with the rotating wheel 11 is also provided with a handle 13 for opening or closing the door body 1; when the rotating wheel 11 rotates forwards, the rotating wheel 11 enables the connecting rod assembly 3 to act through the driving rod 12, so that the door body 1 is separated from the door frame 2, and the people's air defense door is closed and opened; when the runner 11 rotates reversely, the runner 11 operates the link assembly 3 via the driving lever 12, so that the door body 1 is fixed to the door frame 2.
Referring to fig. 3 and 4, the link assembly 3 includes a driving assembly 31, an upper rod assembly 33 connected to the driving assembly 31 and used for fixing the upper portion of the door body 1, and a lower rod assembly 32 connected to the driving assembly 31 and used for fixing the lower portion of the door body 1; the driving assembly 31 includes a first bevel gear 311 horizontally disposed, a second bevel gear 312 engaged with the first bevel gear 311, and a protective case 310 for protecting the first bevel gear 311 and the second bevel gear 312, the first bevel gear 311 and the second bevel gear 312 being perpendicular to each other; a vertically arranged lead screw 313 penetrates through the middle part of the first bevel gear 311, and the upper rod assembly 33 and the lower rod assembly 32 are vertically and symmetrically arranged along the lead screw 313.
Referring to fig. 4 and 5, a shuttle-shaped sliding block 317 sliding along the screw 313 is disposed on the screw 313, an upper fixing block 314 and a lower fixing block 315 for limiting the screw 313 on the surface of the door body 1 are disposed at two ends of the screw 313, respectively, and a guide groove 316 for guiding the sliding block 317 is disposed between the upper fixing block 314 and the lower fixing block 315; the lead screw 313 is rotatably connected with a first bevel gear 311, a second bevel gear 312 is rotatably connected with the driving rod 12, two sides of the sliding block 317 are respectively provided with a connecting head 318 which extends outwards in an inclined way, the connecting heads 318 are in threaded connection with a connecting rod 319, and one end of the connecting rod 319, which is far away from the sliding block 317, is respectively connected with the upper rod assembly 33 and the lower rod assembly 32;
referring to fig. 4 and 6, the lower rod assembly 32 includes a driving block 321 hinged to one end of the connecting rod 319 far away from the slider 317, the vertical section of the driving block 321 is a right trapezoid, a central shaft 14 extends horizontally outwards from the door body 1, and the driving block 321 is sleeved on the central shaft 14 and rotates along the central shaft 14; the two ends of the driving block 321, which are far away from the middle shaft 14, are respectively provided with a first connecting point 3211 and a second connecting point 3212, one end of the driving block 321, which is close to the second connecting point 3212, is hinged to the connecting rod 319, the first connecting point 3211 is hinged to the lower actuating rod 322, one end of the lower actuating rod 322, which is far away from the driving block 321, is detachably connected to the lower bolt 323, and the doorsill 25 of the door frame 2 is provided with a square lower bolt hole 221 in cooperation with the lower bolt 323; the lower part of the door body 1 is provided with a lower guide fixing block 328, the lower guide fixing block 328 is vertically and fixedly connected with a lower guide sleeve 327, and the lower bolt 323 slides along the lower guide sleeve 327.
Referring to fig. 4 and 7, the upper rod assembly 33 includes an upper actuating rod 331 hinged to the second connecting point 3212 of the driving block 321, an upper bolt 332 for inserting into the door frame 2 is detachably connected to an end of the upper actuating rod 331 away from the driving block 321, and a square upper bolt hole (not shown) is formed in the lintel 24 of the door frame 2 and the upper bolt 332; the upper portion of the door body 1 is provided with an upper guide fixing block 337, the upper guide fixing block 337 is vertically and fixedly connected with an upper guide sleeve 336, and the upper plug 332 slides along the upper guide sleeve 336.
The implementation principle of the embodiment is as follows: when the rotating wheel 11 rotates in the forward direction, the rotating wheel 11 drives the second bevel gear 312 to rotate through the driving rod 12, then the second bevel gear 312 drives the first bevel gear 311 to rotate, the first bevel gear 311 drives the lead screw 313 to rotate, so that the sliding block 317 is guided by the guide groove 316 and slides downwards along the lead screw 313, meanwhile, the sliding block 317 drives the connecting rod 319 to move downwards, the connecting rod 319 drives the driving block 321 to incline, and one end of the driving block 321, which is close to the connecting rod 319, is lower than the other end of the driving block 321; meanwhile, the lower actuating rod 322 rises to make the lower bolt 323 disengaged from the lower bolt 323 hole 21 along the lower guide sleeve 327, the upper actuating rod 331 falls to make the upper bolt 332 disengaged from the upper bolt 332 hole 22 along the upper guide sleeve 336, and when the middle shaft 14, the first connection point 3211 and the second connection point 3212 are on the same horizontal line, the bolt on the actuating rod is disengaged from the door frame 2, so that the door body 1 can rotate in the door frame 2 along the door hinge lug 23;
when the rotating wheel 11 rotates reversely, the sliding block 317 slides upwards along the lead screw 313, and simultaneously the sliding block 317 drives the connecting rod 319 to move upwards, the connecting rod 319 drives the driving block 321 to incline, and one end of the driving block 321 close to the connecting rod 319 is higher than the other end of the driving block 321; meanwhile, the lower action rod 322 descends, and drives the lower bolt 323 to be inserted into the lower bolt 323 hole 21 along the lower guide sleeve 327, the upper action rod 331 ascends, and drives the upper bolt 332 to be inserted into the upper bolt 332 hole 22 along the upper guide sleeve 336, when the center shaft 14, the first connection point 3211 and the second connection point 3212 are located on the same vertical line, the bolt on the action rod is inserted into the door frame 2, so that the door body 1 is fixed in the door frame 2, and the people's defense door is closed.
When the specification of the door body 1 changes, the distance between each bolt and the corresponding bolt hole is inconsistent, and the length of the bolt hole is fixed, so that the bolt cannot be inserted into the bolt hole; in this embodiment, in order to enable the connecting rod assembly 3 to be adapted to door bodies 1 of different specifications, referring to fig. 4 and 6, the joints between the lower actuating rods 322 and the lower plugs 323 are respectively provided with a first adjusting structure (not shown), the first adjusting structure includes lower adjusting sleeves 326, one ends of the lower adjusting sleeves 326, which are far away from the lower actuating rods 322, are provided with lower lugs 325 hinged to the lower plugs 323, the lower actuating rods 322 are provided with lower joints 324, which have a diameter smaller than that of the lower actuating rods 322, in cooperation with the lower adjusting sleeves 326, and the lower joints 324 are in threaded connection with the lower adjusting sleeves 326.
Referring to fig. 4 and 7, a second adjusting structure (not shown) is disposed at the connection between the upper actuating rod 331 and the upper plug 332, the second adjusting structure includes an upper adjusting sleeve 335, an upper hanging lug 334 hinged to the upper plug 332 is disposed at one end of the upper adjusting sleeve 335 away from the upper actuating rod 331, the upper actuating rod 331 is provided with an upper joint 333 having a diameter smaller than that of the upper actuating rod 331 in cooperation with the upper adjusting sleeve 335, and the upper joint 333 is in threaded connection with the upper adjusting sleeve 335;
when the specification of the door body 1 changes, the distance between the two joints and the corresponding adjusting sleeves is adjusted, so that the corresponding bolts can be inserted into the corresponding bolt holes, and the application range is expanded.
Example two
The difference from the first embodiment is that, referring to fig. 8 and 9, the upper pin 332 and the lower pin 323 are both trapezoidal, and a trapezoidal insertion hole is also provided in the corresponding guide sleeve, and the parallel side surfaces of the upper pin 332 and the lower pin 323 are both provided with a bean-jumping spring (not shown), and the corresponding guide sleeve is provided with a first limiting hole (not shown) in the upper portion of the guide sleeve and a second limiting hole (not shown) in the lower portion of the guide sleeve in cooperation with the bean-jumping spring.
After the upper bolt 332 or the lower bolt 323 is separated from the corresponding bolt hole along the upper guide sleeve 336 or the lower guide sleeve 327, respectively, the jumping bean spring is clamped by the first limiting hole, so that the bolt is fixed in the guide sleeve, and the bolt is prevented from falling back under the action of gravity to influence normal use; in a similar way, the second limiting hole prevents the bolt from rebounding to the corresponding guide sleeve under the influence of external force.
The door body 1 is conveniently fixed in the door frame 2 by arranging the connecting rod assembly 3; by arranging the adjusting structure, the connecting rod assembly 3 can adapt to the door bodies 1 with different specifications, and the application range is expanded; through setting up trapezoidal bolt and jumping the beans spring, can avoid the bolt to receive self action of gravity and whereabouts, facilitate the use.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides a people's air defense door who facilitates use, includes the door body (1) and rotates door frame (2) of being connected, its characterized in that with the door body (1): the inner side of the door body (1) is symmetrically provided with connecting rod assemblies (3) along a vertical central axis of the door body (1), each connecting rod assembly (3) comprises a driving block (321), a central axis (14) extends from the door body to the center of the driving block (321), and the driving block (321) rotates along the central axis (14); a first connecting point (3211) and a second connecting point (3212) are respectively arranged at two ends of the driving block (321), the first connecting point (3211) is rotatably connected with one action rod, the second connecting point (3212) is rotatably connected with the other action rod, and a bolt inserted into the door frame (2) is arranged at one end of each action rod away from the corresponding connecting point; when the middle shaft (14), the first connecting point (3211) and the second connecting point (3212) are on the same vertical line, the door body (1) is fixed in the door frame (2); when the middle shaft (14), the first connecting point (3211) and the second connecting point (3212) are on the same horizontal line, the door body (1) rotates along the door frame (2).
2. A convenient civil air defense door as claimed in claim 1 wherein: the door body (1) is further provided with a driving assembly (31), the driving assembly (31) comprises a pair of mutually perpendicular bevel gears arranged on the inner side of the door body, a protective shell (310) is arranged outside the bevel gears, a lead screw (313) penetrates through the horizontally arranged bevel gears, and the vertical bevel gears are rotationally connected with a rotating wheel (11) arranged on one side, far away from the driving assembly (31), of the door body (1) through a driving rod (12); the lead screw (313) is provided with a sliding block (317) which slides along the lead screw (313), both sides of the sliding block (317) can be detachably connected with a connecting rod (319), and the connecting rod (319) is rotatably connected with a driving block (321).
3. A convenient civil air defense door as claimed in claim 1 wherein: the upper portion and the lower part of the door body (1) are provided with guide structures used for guiding the bolt, each guide structure comprises a fixed block used for being fixed on the door body (1) and a guide sleeve used for guiding the bolt, and a guide through hole used for inserting the bolt is formed in each guide sleeve.
4. A convenient civil air defense door as claimed in claim 3 wherein: the door frame (2) bottom is equipped with threshold (25), be equipped with the bolt hole that the cooperation bolt was used on threshold (25), the bolt hole is square.
5. A convenient civil air defense door as claimed in claim 3 wherein: the bolt is trapezoidal, the cooperation bolt also is equipped with trapezoidal jack in the uide bushing.
6. A convenient civil air defense door as claimed in claim 5 wherein: the outer surface of the bolt is provided with a bean jumping spring, and the guide sleeve is internally provided with a limiting hole matched with the bean jumping spring.
7. A convenient civil air defense door as claimed in claim 1 wherein: the handle (13) is arranged on the surface of the door body (1) provided with the rotating wheel (11).
8. A convenient civil air defense door as claimed in claim 1 wherein: the action bars all are equipped with the regulation structure with the junction of bolt, adjust the structure and include adjusting sleeve, adjusting sleeve keeps away from the one end of action bars and is equipped with the engaging lug of dismantling the connection with the bolt, action bars cooperation adjusting sleeve is equipped with the diameter and is less than the joint of action bars, connect and can dismantle with adjusting sleeve and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822154166.5U CN210239410U (en) | 2018-12-20 | 2018-12-20 | Civil air defense door convenient to use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822154166.5U CN210239410U (en) | 2018-12-20 | 2018-12-20 | Civil air defense door convenient to use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210239410U true CN210239410U (en) | 2020-04-03 |
Family
ID=69961380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822154166.5U Active CN210239410U (en) | 2018-12-20 | 2018-12-20 | Civil air defense door convenient to use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210239410U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081500A (en) * | 2020-07-21 | 2020-12-15 | 中铁第四勘察设计院集团有限公司 | Decoration wall surface |
| CN115288538A (en) * | 2022-08-15 | 2022-11-04 | 上海松洋民防工程设备有限公司 | Hidden locking device of civil air defense door |
-
2018
- 2018-12-20 CN CN201822154166.5U patent/CN210239410U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081500A (en) * | 2020-07-21 | 2020-12-15 | 中铁第四勘察设计院集团有限公司 | Decoration wall surface |
| CN115288538A (en) * | 2022-08-15 | 2022-11-04 | 上海松洋民防工程设备有限公司 | Hidden locking device of civil air defense door |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210239410U (en) | Civil air defense door convenient to use | |
| DE112014000110T5 (en) | Guide rope rope deflection prevention mechanism and method for parallel soft rope suspension system | |
| CN217269495U (en) | Protection door bolt structure of shocking resistance | |
| CN216277414U (en) | Protection door ring and door bolt with prying plate groove structure for material conveying platform of construction elevator | |
| CN212318076U (en) | Coal mine safety escape device | |
| CN209704474U (en) | Geological drilling machine, the standard penetration equipment of geological drilling machine and its lifting post | |
| DE102017123493A1 (en) | Lower door member with folding roll holder | |
| CN110707595B (en) | Safety method for lightning arrester line to enter equipotential in live state | |
| CN219603195U (en) | Wellhead maintenance platform | |
| CN209398139U (en) | A kind of torsional spring connector for preventing from loosening | |
| CN211375864U (en) | Bridge simulation training monitor is adjusted to over-and-under type | |
| CN220101169U (en) | Electric power iron tower protector | |
| CN216811471U (en) | Bulletproof explosion-proof security door | |
| CN210957557U (en) | Insulated delivery vehicle for equipotential operation | |
| CN112081620A (en) | Isolation baffle for coal mine safety management | |
| DE4006912C2 (en) | Gate with lifting and lowering locking elements | |
| CN221481629U (en) | Highway construction guardrail | |
| CN219794928U (en) | Building construction safety warning fence | |
| CN213049151U (en) | Safety weight box for adolescent fitness equipment | |
| CN216767312U (en) | Well drilling hydraulic tong riser | |
| CN220929125U (en) | Civil air defense door leaf convenient to installation | |
| CN215292192U (en) | Anti-deformation dead-locking protective door | |
| CN214330464U (en) | Safety door for raw material placing frame | |
| CN218029157U (en) | Protection device for be used for construction elevator well | |
| CN217352684U (en) | Excavator hood limiting mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |