CN220101298U - Coal mine tunneling supporting structure - Google Patents
Coal mine tunneling supporting structure Download PDFInfo
- Publication number
- CN220101298U CN220101298U CN202321683837.1U CN202321683837U CN220101298U CN 220101298 U CN220101298 U CN 220101298U CN 202321683837 U CN202321683837 U CN 202321683837U CN 220101298 U CN220101298 U CN 220101298U
- Authority
- CN
- China
- Prior art keywords
- ground
- flitch
- supporting structure
- coal mine
- mine
- 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
- 239000003245 coal Substances 0.000 title claims abstract description 21
- 230000005641 tunneling Effects 0.000 title abstract description 9
- 238000010276 construction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 8
- 239000004575 stone Substances 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model provides a coal mine tunneling support structure, which relates to the technical field of coal mine collection and comprises a first ground flitch and a second ground flitch, wherein the tops of the first ground flitch and the second ground flitch are respectively provided with a placing groove, the tops of the first ground flitch and the second ground flitch are respectively provided with a shielding arc plate, the shielding arc plates are arc-shaped, the structure is not required to be disassembled and assembled and can be used anywhere, the structure is mainly applied to support a mine, when the support structure is placed, the first ground flitch and the second ground flitch are firstly arranged on two sides of a wellhead, during installation, a ground pointed cone at the bottom of the first ground flitch and the second ground flitch is pricked into the ground, then a balancing weight is selected and placed in the placing groove, the balancing weight can be a certain weight of an object, and can be a stone or other weight of an object, the shielding arc plates at the top can prevent stone blocks around the mine from rolling into the mine to injure workers.
Description
Technical Field
The utility model relates to the technical field of coal mine collection, in particular to a coal mine tunneling supporting structure.
Background
Coal is a combustible black or brown-black sedimentary rock, and usually occurs in rock strata or ore veins of coal beds or coal beds, and is mainly composed of elements such as carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus and the like, wherein the sum of the three elements accounts for more than 95% of organic matters, and is a very important energy source for producing electric power or heat energy mainly through combustion; is also an important raw material in metallurgical and chemical industries for refining metals or producing chemical fertilizers and a plurality of chemical products, and coal is a solid combustible mineral which is formed by the gradual formation of complex biochemical and physicochemical changes of ancient plants buried underground.
According to the safety support structure for coal mine tunneling disclosed in the Chinese patent No. CN217001907U, the safety support structure comprises a support frame, wherein a fixed bottom plate is arranged at the bottom of the support frame, an adjusting sleeve is arranged on the inner side of the support frame, an adjusting rod is inserted into the inner side of the adjusting sleeve, and a supporting mechanism is arranged at the top of the adjusting rod; fixing holes are formed in the corners of the fixing bottom plate, and limiting grooves are formed in the upper surface of the fixing bottom plate and located on the inner side of the supporting frame; limiting holes are formed in the left side and the right side of the adjusting sleeve and the left side of the adjusting rod, and limiting rods are inserted into the limiting holes; the supporting mechanism comprises a supporting cross rod, a reinforcing rod, an extension rod and a supporting plate, wherein the supporting cross rod is arranged at the top of the adjusting rod, and compared with the existing safety supporting structure for coal mine tunneling, the safety supporting structure for coal mine tunneling can be improved in overall convenience, adjustability and practicability through design.
The supporting structure in the prior art can play a supporting role to a certain extent, but the following problems exist in the actual use process: 1. the height of the supporting structure cannot be adjusted in a large range, so that the application occasions of the whole supporting structure are less; 2. there are many disassembly steps during the assembly or disassembly, which is very troublesome, and one person cannot independently operate, so that a coal mine tunneling support structure is needed to solve the problems.
Disclosure of Invention
The utility model aims to solve the problems that the prior art cannot adjust the height of a supporting structure in a large range, so that the application occasions of the whole supporting structure are fewer, a plurality of disassembling steps are caused during installation or disassembly, the operation is very troublesome, and one person cannot independently operate.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a colliery tunnelling supporting construction, includes first ground flitch and second ground flitch, the standing groove has all been seted up at the top of first ground flitch and second ground flitch, shielding arc board is all installed at the top of first ground flitch and second ground flitch, shielding arc board's shape is convex.
Preferably, the bottoms of the first ground flitch and the second ground flitch are in threaded connection with a ground pointed cone, the ground pointed cone is pricked into the ground, and the bottoms of the first ground flitch and the second ground flitch are attached to the ground.
Preferably, the bottoms of one side of the first ground flitch and the second ground flitch are respectively provided with an overhead block, and the bottoms of the overhead blocks are provided with a telescopic layer.
Preferably, the shape of the telescopic layer is parallelogram, the bottom of the telescopic layer is provided with a middle connecting block, and the middle parts of the middle connecting blocks are connected with the telescopic layer.
Preferably, one side of the middle connecting block is clamped with a top arc plate, and the bottom end of the top arc plate is movably connected with a bottom arc plate.
Preferably, the bottom of the middle connecting block is provided with a bottom placing block, and one side of the middle connecting block is connected with a veneering cone in a threaded manner.
Preferably, both sides of the bottom block are respectively connected with a side support plate in a clamping way, and the bottom of the bottom block is connected with a bottom pricking cone in a threaded way.
Advantageous effects
The utility model has the advantages that the structure is not required to be disassembled and assembled, the structure can be used anywhere, the structure is mainly applied to the support of a mine, when the supporting structure is placed, the first ground flitch and the second ground flitch are firstly installed on two sides of a wellhead, the ground sharp cones at the bottoms of the first ground flitch and the second ground flitch are pricked into the ground during installation, then one balancing weight is selected and placed in a placing groove, the balancing weight is an object with a certain weight, and the balancing weight can be stone or other objects with weight, and has the main effects of temporary reinforcement, and the shielding arc plate at the top can prevent stone blocks around the mine from rolling into the mine to injure workers.
In the utility model, the supporting structure at the bottom is movable and not fixed, after the first ground flitch and the second ground flitch are fixed, the supporting structures at the two sides are simultaneously lowered into the mine, the supporting structure at the bottom can be attached to the inner wall of the mine when being lowered, the supporting structure is mainly connected by the telescopic layers, the whole supporting structure has four telescopic layers, each telescopic layer can be stretched to one meter, so that the whole supporting structure can be suitable for mines with various heights, the bottom blocks at the bottom of the supporting structure are ensured to be close to the bottom in the mine when the supporting structure is lowered, and the stretched height can be prolonged again if the stretched height is insufficient, the middle connecting block clamping connection of the top arc plate and the top, the middle connecting block clamping connection of the bottom arc plate and the bottom mainly play a reinforcing role, after the top arc plate and the bottom arc plate are installed, the supporting structure can not be stretched, and finally the bottom pricking cone at the bottom of the bottom placing block is pricked into the bottom of a mine, so that the whole supporting structure is fixed, the supporting structure has strong firmness, the side supporting plates at the two sides of the bottom placing block can support the ground in the mine, the supporting assembly is prevented from toppling over, the problem that the supporting structure height cannot be adjusted in a large range, the whole supporting structure is less in applicable occasion and has a plurality of disassembling steps during installation or disassembly, and the problem that one person cannot independently operate is solved.
Drawings
FIG. 1 is an overall block diagram of the present utility model;
FIG. 2 is a top view of the overall structure of the present utility model;
FIG. 3 is a front view of a first floor flitch of the present utility model;
fig. 4 is a side view of a first ground flitch of the present utility model.
Legend description:
1. a first ground veneer; 2. a ground spike cone; 3. a second ground flitch; 4. a top block; 5. a veneering cone; 6. a middle joint block; 7. a telescoping layer; 8. a bottom block; 9. pricking a bottom cone; 10. a top arc plate; 11. a bottom arc plate; 12. shielding the arc plate; 13. a placement groove; 14. and (5) an edge support plate.
Detailed Description
In order that the manner in which the above recited features, objects and advantages of the present utility model are obtained, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the utility model.
Specific embodiments of the present utility model are described below with reference to the accompanying drawings.
First embodiment:
referring to fig. 1-4, a coal mine tunneling supporting structure comprises a first ground flitch 1 and a second ground flitch 3, wherein the tops of the first ground flitch 1 and the second ground flitch 3 are provided with a placing groove 13, the tops of the first ground flitch 1 and the second ground flitch 3 are provided with a shielding arc plate 12, the shielding arc plate 12 is arc-shaped, the bottoms of the first ground flitch 1 and the second ground flitch 3 are in threaded connection with a ground pointed cone 2, the ground pointed cone 2 is pricked into the ground, and the bottoms of the first ground flitch 1 and the second ground flitch 3 are attached to the ground.
The structure is free from disassembly and assembly, can be used anywhere, is mainly applied to support of a mine, when a supporting structure is placed, the first ground flitch 1 and the second ground flitch 3 are firstly installed on two sides of a wellhead, the ground spike cone 2 at the bottom of the first ground flitch 1 and the second ground flitch 3 is pricked into the ground during installation, then a balancing weight is selected to be placed in a placing groove 13, the balancing weight is an object with a certain weight, stones or other objects with weight, the temporary reinforcement is mainly achieved, a shielding arc plate 12 at the top can prevent stones around the mine from rolling into the mine to injure workers, the structures of the first ground flitch 1 and the second ground flitch 3 are identical, the supporting structure comprising the bottom is also identical, and the first ground flitch 1 and the second ground flitch 3 are flush with the ground after being installed.
Specific embodiment II:
referring to fig. 1 to 4, the top blocks 4 are mounted to the bottoms of one sides of the first and second ground boards 1 and 3, and the telescopic layer 7 is mounted to the bottoms of the top blocks 4.
The shape of the telescopic layer 7 is parallelogram, the bottom of the telescopic layer 7 is provided with a middle joint block 6, and the middle parts of the middle joint blocks 6 are connected with the telescopic layer 7.
One side of the middle connecting block 6 is respectively connected with a top arc plate 10 in a clamping way, and the bottom end of the top arc plate 10 is movably connected with a bottom arc plate 11.
The bottom of the middle connecting block 6 is provided with a bottom placing block 8, and one side of the middle connecting block 6 is connected with a veneering cone 5 in a threaded manner.
Both sides of the bottom block 8 are respectively connected with a side support plate 14 in a clamping way, and the bottom of the bottom block 8 is connected with a bottom pricking cone 9 in a threaded way.
The supporting structure at the bottom of the first ground flitch 1 and the second ground flitch 3 mainly comprises a top block 4, a middle connecting block 6 and a bottom block 8, the supporting structure at the bottom is movable or not fixed, after the first ground flitch 1 and the second ground flitch 3 are fixed, the supporting structures at the two sides are simultaneously lowered into a mine, the supporting structure at the bottom can be attached to the inner wall of the mine when being lowered, the supporting structure is mainly connected by telescopic layers 7, the whole supporting structure shares four sections of telescopic layers 7, each telescopic layer 7 can be stretched to one meter, the bottom block 8 at the bottom of the supporting structure is close to the bottom in the mine when the supporting structure is lowered, if the stretched height is insufficient, a group of telescopic layers 7 can be mounted again, the top and the bottom of the telescopic layers 7 are connected through the middle connecting block 6, the whole supporting structure shares four layers, each layer is composed of an upper middle connecting block 6, a lower middle connecting block 6 and a telescopic layer 7, when a supporting structure is placed, workers go down into a mine, veneering cones 5 on the side edges of all the middle connecting blocks 6 are pricked into the inner wall of the mine, the supporting structure is fixed, the mine can be supported by the supporting structure, then a top arc plate 10 is arranged between the upper middle connecting block 6 and the lower middle connecting block 6, a bottom arc plate 11 is contracted in the top arc plate 10, the difference between the upper middle connecting block 6 and the lower middle connecting block 6 is small, the bottom arc plate 11 is in clamping connection with the middle connecting block 6 on the top, the bottom arc plate 11 is in clamping connection with the middle connecting block 6 on the bottom, the purpose of reinforcement is mainly achieved, after the top arc plate 10 and the bottom arc plate 11 are arranged, the supporting structure can not be stretched, finally the pricking cones 9 on the bottom of the bottom connecting blocks 8 are pricked into the bottom of the mine, the whole supporting structure is fixed, and have very strong fastness, the limit fagging 14 of the both sides of end piece 8 can prop the ground in the mine, prevent that supporting component from empting, and whole installation step only needs one person to accomplish, only needs from the top down to fix in proper order and just can be quick accomplish bearing structure's installation, also does not need to borrow unnecessary instrument.
To sum up:
1. the structure is free from disassembly and assembly, can be used anywhere, is mainly applied to support of a mine, when a supporting structure is placed, the first ground flitch 1 and the second ground flitch 3 are firstly installed on two sides of a wellhead, the ground spike cone 2 at the bottom of the first ground flitch 1 and the second ground flitch 3 is pricked into the ground during installation, then a balancing weight is selected to be placed in a placing groove 13, the balancing weight is an object with a certain weight, stones or other objects with weight, the temporary reinforcement is mainly achieved, a shielding arc plate 12 at the top can prevent stones around the mine from rolling into the mine to injure workers, the structures of the first ground flitch 1 and the second ground flitch 3 are identical, the supporting structure comprising the bottom is also identical, and the first ground flitch 1 and the second ground flitch 3 are flush with the ground after being installed.
2. The supporting structure at the bottom of the first ground flitch 1 and the second ground flitch 3 mainly comprises a top block 4, a middle connecting block 6 and a bottom block 8, the supporting structure at the bottom is movable or not fixed, after the first ground flitch 1 and the second ground flitch 3 are fixed, the supporting structures at the two sides are simultaneously lowered into a mine, the supporting structures at the bottom can be attached to the inner wall of the mine when being lowered, the supporting structures are mainly connected by telescopic layers 7, the whole supporting structure has four sections of telescopic layers 7, each telescopic layer 7 can be stretched to one meter, so that the whole supporting structure can be suitable for mines with various heights, the bottom block 8 at the bottom of the supporting structure is ensured to be similar to the bottom in the mine when the supporting structure is lowered, if the stretched height is insufficient, a group of telescopic layers 7 can be installed again, the top and the bottom of the telescopic layers 7 are connected through the middle connecting block 6, the whole supporting structure has four layers, each layer is composed of an upper middle connecting block 6, a lower middle connecting block 6 and a telescopic layer 7, when the supporting structure is placed, workers go down into a mine, firstly, the veneering cones 5 on the side edges of all the middle connecting blocks 6 are pricked into the inner wall of the mine, thus the supporting structure is fixed, the mine can be supported by the supporting columns, then, a top arc plate 10 is arranged between the upper middle connecting block 6 and the lower middle connecting block 6, a bottom arc plate 11 is contracted in the top arc plate 10, the difference between the upper middle connecting block 6 and the lower middle connecting block 6 is small, the bottom arc plate 11 is in clamping connection with the middle connecting block 6 at the top, the purpose of reinforcement is mainly achieved, after the top arc plate 10 and the bottom arc plate 11 are arranged, the supporting structure cannot be stretched, finally, the pricking cones 9 at the bottom of the bottom connecting block 8 are pricked into the bottom of the mine, the whole supporting structure is fixed, the firmness is strong, and the side supporting plates 14 at the two sides of the bottom block 8 can support the ground in the mine, so that the supporting component is prevented from toppling.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a colliery tunnelling supporting construction, includes first ground flitch (1) and second ground flitch (3), its characterized in that: the top of first ground flitch (1) and second ground flitch (3) has all been seted up standing groove (13), shielding arc board (12) are all installed at the top of first ground flitch (1) and second ground flitch (3), shielding arc board (12) shape is convex.
2. A coal mine tunnelling support structure as claimed in claim 1, wherein: the ground surface pasting board is characterized in that the bottoms of the first ground surface pasting board (1) and the second ground surface pasting board (3) are connected with a ground pointed cone (2) in a threaded mode, the ground pointed cone (2) is pricked into the ground, and the bottoms of the first ground surface pasting board (1) and the second ground surface pasting board (3) are both attached to the ground.
3. A coal mine tunnelling support structure as claimed in claim 1, wherein: the bottom of one side of first ground flitch (1) and second ground flitch (3) all installs overhead piece (4), telescopic layer (7) are installed to the bottom of overhead piece (4).
4. A coal mine tunnelling support structure as claimed in claim 3 wherein: the shape of the telescopic layer (7) is parallelogram, the bottom of the telescopic layer (7) is provided with a middle connecting block (6), and the middle parts of the middle connecting blocks (6) are connected with the telescopic layer (7).
5. A coal mine tunnelling support structure as claimed in claim 4 wherein: one side of the middle connecting block (6) is respectively connected with a top arc plate (10) in a clamping mode, and the bottom end of the top arc plate (10) is movably connected with a bottom arc plate (11).
6. A coal mine tunnelling support structure as claimed in claim 4 wherein: the bottom of the middle connecting block (6) is provided with a bottom placing block (8), and one side of the middle connecting block (6) is connected with a veneering cone (5) in a threaded manner.
7. A coal mine tunnelling support structure as claimed in claim 6 wherein: both sides of the bottom block (8) are respectively connected with a side support plate (14) in a clamping mode, and the bottom of the bottom block (8) is connected with a bottom pricking cone (9) in a threaded mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321683837.1U CN220101298U (en) | 2023-06-29 | 2023-06-29 | Coal mine tunneling supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321683837.1U CN220101298U (en) | 2023-06-29 | 2023-06-29 | Coal mine tunneling supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220101298U true CN220101298U (en) | 2023-11-28 |
Family
ID=88841915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321683837.1U Active CN220101298U (en) | 2023-06-29 | 2023-06-29 | Coal mine tunneling supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220101298U (en) |
-
2023
- 2023-06-29 CN CN202321683837.1U patent/CN220101298U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101634230B (en) | Coal face self-moving forepoling | |
| CN201460935U (en) | Filling timbering integrated hydraulic support | |
| CN104820086B (en) | A kind of rock stratum and subsidence simulation box type testing apparatus | |
| CN113653523B (en) | Triangular-area wide temporary support device and support method for quickly withdrawing hydraulic support | |
| CN101182780A (en) | Coal mine down-hole splited articulated look ahead supporting support | |
| CN110029833B (en) | Construction device and construction method for synchronous descending of whole building | |
| CN202266277U (en) | Contractible strut for U-shaped shed support | |
| CN110985084A (en) | Coal roadway full-section self-moving advanced temporary support device and support method | |
| CN220101298U (en) | Coal mine tunneling supporting structure | |
| CN209053627U (en) | A kind of underground coal mine support frame lift-moving type linked roof bar hydraulic support | |
| CN210068218U (en) | Multipurpose roadway advance support hydraulic support | |
| CN209026462U (en) | A kind of coal mine machinery security supports platform | |
| CN106437727A (en) | Pumped storage power station inclined shaft construction variable-angle expanding excavation trolley | |
| CN206177941U (en) | Experimental device for be used for laying inclined coal seam | |
| CN113653524A (en) | Broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device | |
| CN203822347U (en) | Light mining combined hydraulic support | |
| CN208996750U (en) | A kind of tunnelling shield support | |
| CN221896610U (en) | Supporting device for fully-mechanized coal roadway digging working face | |
| CN110080813A (en) | One kind cutting top wall supporting device and method | |
| CN217872842U (en) | Coal mine tunneling and supporting device | |
| CN108226444A (en) | A kind of varied angle analog simulation experiment shelf | |
| CN215979439U (en) | Assembled temporary supporting structure for muddy rock water-rich tunnel | |
| CN221921032U (en) | Three soft coal seam comprehensive caving face anti-slip hydraulic support | |
| CN216342237U (en) | Coal mine safety supporting device | |
| CN221400575U (en) | Supporting device for coal mine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |