CN220726311U - Spraying and reinforcing device for coal wall rib - Google Patents
Spraying and reinforcing device for coal wall rib Download PDFInfo
- Publication number
- CN220726311U CN220726311U CN202322387079.5U CN202322387079U CN220726311U CN 220726311 U CN220726311 U CN 220726311U CN 202322387079 U CN202322387079 U CN 202322387079U CN 220726311 U CN220726311 U CN 220726311U
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- coal wall
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- stand
- support
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- 239000003245 coal Substances 0.000 title claims abstract description 84
- 238000005507 spraying Methods 0.000 title claims abstract description 61
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 20
- 238000007569 slipcasting Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 33
- 230000002787 reinforcement Effects 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 8
- 230000002265 prevention Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 14
- 230000008093 supporting effect Effects 0.000 description 9
- 239000002002 slurry Substances 0.000 description 8
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The utility model provides a spraying and reinforcing device for coal wall caving, which relates to the technical field of coal mining and comprises the following components: the spraying support, pneumatic grouting pump, guniting pipeline and control system, pneumatic grouting pump is connected to the spraying support via the guniting pipeline, and control system is connected with pneumatic grouting pump electricity, and wherein, the spraying support includes: support base, stand and nozzle, the one end of stand is connected to support base, and the other end and the nozzle of stand are connected, and the inside of stand is provided with along its axial direction extended slip casting passageway, and the stand is close to the one end of support base still to be provided with the mounting hole with slip casting passageway intercommunication, and the slip casting pipeline is connected to the mounting hole to the slip casting pipeline is fluid communication with the nozzle via slip casting passageway. The device has the advantages of simple structure, reliable system, flexible spraying operation, high construction efficiency and the like, can effectively grasp the ledge prevention and treatment time window after implementation, and can solve the contradiction between narrow ledge prevention and treatment time window and long time consumption of the traditional complex prevention and treatment process.
Description
Technical Field
The utility model relates to the technical field of coal mining, in particular to a spraying and reinforcing device for coal wall caving.
Background
In recent years, with the increase of the thickness of the domestic mined coal seam, the wall of the coal wall is easy to slip and other damages due to the reasons of the structure, mechanical properties and the like of the coal body, so that great personal threat is caused to underground staff, and the safety production of the coal mine is influenced. Because the coal wall caving disaster of the fully mechanized coal face is serious, the working face has to take some reinforcing measures for the coal wall caving, the workload of auxiliary work is increased, and the fully mechanized coal cost is increased. Step recovery is usually utilized at home and abroad, but the method has lower efficiency.
In the past engineering practice, metal anchor rods are adopted to strengthen coal wall caving, but the metal anchor rods are not easy to be cut off by a coal cutter in a fully-mechanized mining face roadway, in the mining process, the coal cutter is easy to generate sparks when being contacted with the metal anchor rods, the gas content of the fully-mechanized mining face is high, and serious gas explosion accidents are easy to occur, so that casualties and property loss are caused; the improved coir rope grouting anchor rod has the advantages that the tensile strength, shearing strength and other strength of chemical pulp are low, the chemical pulp is easy to damage, the cost of the chemical pulp is high, the quality of coal after exploitation is also influenced, the coir rope is extremely easy to be wound with a coal mining machine, the coal mining machine is damaged, and mining accidents are caused.
In order to solve the problems of complex flow, long time consumption, potential safety hazard and the like existing in the prior art for reinforcing the coal wall caving, a novel reinforcing device is necessary to be provided.
Disclosure of Invention
The utility model provides a spraying and reinforcing device for coal wall caving, which is used for solving the defects of complex flow, long time consumption, potential safety hazard and the like existing in the prior art for reinforcing the coal wall caving.
The utility model provides a spraying and reinforcing device for coal wall rib plates, which comprises the following components: the pneumatic grouting pump is connected to the spraying bracket through the grouting pipeline, the control system is electrically connected with the pneumatic grouting pump,
wherein, the spraying support includes: support base, stand and nozzle, the one end of stand is connected to support the base, the other end of stand with the nozzle is connected, the inside of stand is provided with along its axial direction extension's slip casting passageway, the stand be close to support the one end of base still be provided with the mounting hole of slip casting passageway intercommunication, the slip casting pipeline is connected to the mounting hole, and the slip casting pipeline is via slip casting passageway with nozzle fluid communication.
According to the coal wall rib spraying reinforcement device provided by the utility model, the nozzle is a right-angle solid conical nozzle.
According to the utility model, the support base comprises: the support plate, first fixed plate, second fixed plate and locking screw, first fixed plate with the second fixed plate is parallel to each other and be connected to respectively the opposite sides of backup pad, first fixed plate is provided with the orientation the screw hole that the second fixed plate runs through, locking screw threaded connection to on the first fixed plate the screw hole.
According to the coal wall rib spraying reinforcement device provided by the utility model, the number of the threaded holes in the first fixing plate is multiple, the threaded holes are arranged at intervals along the length direction of the first fixing plate, and the locking screw is arranged in each threaded hole.
According to the coal wall rib spraying reinforcement device provided by the utility model, the second fixing plate is provided with the threaded hole penetrating towards the first fixing plate, and the locking screw is connected to the threaded hole on the second fixing plate in a threaded mode.
According to the coal wall rib spraying reinforcement device provided by the utility model, the number of the threaded holes in the second fixing plate is multiple, the threaded holes are arranged at intervals along the length direction of the second fixing plate, and the locking screw is arranged in each threaded hole.
According to the coal wall rib spraying reinforcement device provided by the utility model, the top end of the upright post is provided with the nut, and the nozzle is connected to the top end of the upright post through the nut thread.
According to the coal wall rib spraying reinforcement device provided by the utility model, the supporting plate is provided with the threaded holes extending along the thickness direction of the supporting plate, the bottom ends of the stand columns are provided with the threaded structures, and the bottom ends of the stand columns are connected to the supporting plate in a threaded mode.
According to the coal wall rib spraying reinforcement device provided by the utility model, the bottom ends of the upright posts are connected to the supporting plate in a welding mode.
According to the spraying reinforcement device for the coal wall panel wall, provided by the utility model, the spraying support further comprises a reinforcing column, one end of the reinforcing column is fixedly connected to the upright column, and the other end of the reinforcing column is fixedly connected to the top of the supporting base.
The utility model provides a coal wall rib spraying reinforcement device, which comprises a spraying bracket, a pneumatic grouting pump, a spraying pipeline and a control system, wherein the spraying bracket comprises: the spraying bracket can be fixed on the hydraulic bracket base, and spraying materials can be sprayed to the surface of the coal wall by means of the spraying bracket, so that a film protection layer is formed on the surface of the coal wall, and the supporting effect of preventing the coal wall from forming a ledge is achieved. Moreover, the device has the advantages of simple structure, reliable system, flexible spraying operation, high construction efficiency and the like, and can effectively grasp the ledge prevention and control time window after implementation.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of a coal wall panel upper spray reinforcement device in accordance with one embodiment of the present utility model;
FIG. 2 is a schematic view of the construction of a spray bracket in the coal wall panel spray reinforcement apparatus shown in FIG. 1;
FIG. 3 is a schematic view of the structure of a right angle solid cone nozzle in a coal wall panel spray reinforcement device in accordance with one embodiment of the utility model;
FIG. 4 is a schematic view of the installation of the coal wall panel spray reinforcement device shown in FIG. 1 in a real scenario;
fig. 5 is a schematic view of the structure of the coal wall panel spray reinforcement device shown in fig. 1 in a practical scenario.
Reference numerals:
1. spraying a bracket; 11. a support base; 12. a column; 13. a nozzle; 131. a threaded connection; 132. a body portion; 2. a pneumatic grouting pump; 3. a guniting pipeline; 4. a control system; 5. a hydraulic support; 6. a hydraulic support base; 7. a hydraulic drive mechanism; 8. a coal wall.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In one embodiment of the utility model, a coal wall caving spraying and reinforcing device is provided, which can be fixed on a hydraulic support base of a coal face, and spraying materials taking novel chemical polymers and the like as raw materials can be sprayed on the surface of a coal wall by the device, so that a film protective layer is formed on the coal wall rapidly, and the coal wall is reinforced. The coal wall panel upper spray reinforcement device in this embodiment is further described below with reference to fig. 1 to 5.
Specifically, as shown in fig. 1, the coal wall panel upper coating reinforcement device in the present embodiment includes: the pneumatic grouting device comprises a spraying bracket 1, a pneumatic grouting pump 2, a grouting pipeline 3 and a control system 4, wherein the pneumatic grouting pump 2 is connected to the spraying bracket 1 through the grouting pipeline 3, and the control system 4 is electrically connected with the pneumatic grouting pump 2.
In the present embodiment, the control system 4 includes a control switch, which may be used to control the operation state of the pneumatic grouting pump 2, for example, when the control switch is in the off position, the pneumatic grouting pump 2 is in the inactive state, and when the control switch is in the on position, the pneumatic grouting pump 2 is in the active state.
The pneumatic grouting pump 2 is used for receiving the spraying material, and when the pneumatic grouting pump 2 is in an operating state, the pneumatic grouting pump can pump the spraying material to the spraying bracket 1 through the grouting pipeline 3, and then the spraying material is sprayed to the surface of the coal wall through the spraying bracket 1.
The spray boom 1 can be fixed to the hydraulic boom base of the coal face and can be used to spray a spray material. As shown in fig. 2, the spray painting bracket 1 includes: the support base 11, the stand column 12 and the nozzle 13, one end of the stand column 12 is connected to the support base 11, the other end of the stand column 12 is connected with the nozzle 13, a grouting channel extending along the axial direction of the stand column 12 is arranged in the stand column 12, a mounting hole communicated with the grouting channel is further arranged at one end of the stand column 12 close to the support base 11, the grouting pipeline 3 is connected to the mounting hole, and the grouting pipeline 3 is in fluid communication with the nozzle 13 through the grouting channel.
The end of the gunite pipe 3 may be threaded to the mounting hole, for example.
In practical use, the support base 11 may be fixedly arranged on the hydraulic support base according to the position of the coal wall, and simultaneously guide the spraying material into the pneumatic grouting pump 2. When it is desired to spray the spray material onto the coal wall, the operator may send a start command to the pneumatic grouting pump 2 via the control system 4, after which the pneumatic grouting pump 2 is started immediately and pumps the spray material via the grouting line 3 into the grouting channel of the upright 12, after which the spray material in the grouting channel may be sprayed via the nozzle 13 onto the surface of the coal wall.
Therefore, by means of the coal wall caving spraying reinforcement device in the embodiment, spraying materials can be sprayed to the surface of the coal wall, so that a thin film protection layer is formed on the surface of the coal wall, and the coal wall is prevented from being caving.
Further, the nozzle 13 in the present embodiment adopts a rectangular solid conical nozzle.
It can be understood that the spraying angle of the right-angle solid conical nozzle can reach 120 degrees, and the spray nozzle has the characteristics that a pipeline is not easy to block and slurry in a spraying area is uniformly distributed. And the right-angle solid conical nozzle is particularly suitable for a spraying scene with more impurity particles, and can spray the spraying material with more particle impurities on the coal wall. Meanwhile, in the present embodiment, the pneumatic grouting pump 2 is adopted, which can effectively increase the flow rate of the spraying slurry, so that the slurry is not remained in the spraying pipeline and the nozzle, and the whole spraying device is not easy to be blocked.
Thus, in this embodiment, by providing a right angle solid conical nozzle and a pneumatic grouting pump, a "super-strong anti-blocking" can be achieved.
Illustratively, as shown in FIG. 3, the right angle solid conical nozzle includes a threaded connection 131 and a body portion 132 that are connected to each other. The bottom of the screw connection portion 131 is provided with a slurry inflow port, the body portion 132 is provided with a slurry swirling chamber, and the side surface of the body portion 132 is provided with a nozzle outlet. When a right angle solid conical nozzle is mounted on the top end of the post 12, slurry can enter the slurry swirl chamber through the slurry inlet port to swirl and be ejected to the outside through the nozzle outlet.
In one embodiment, a right angle solid conical nozzle may be threadably connected to the top end of the post 12. Specifically, the screw connection portion 131 is provided with external screw threads, the top end of the column 12 is provided with a nut, and the nozzle 13 can be screw-connected to the top of the column 12 via the nut.
In actual use, as shown in fig. 4, the shoring equipment mounted to the coal face generally includes: the hydraulic support 5, hydraulic support base 6 and hydraulic drive mechanism 7, the both ends of hydraulic drive mechanism 7 are connected to hydraulic support 5 and hydraulic support base 6 respectively, and hydraulic support base 6 is placed in the bottom, can jack-up hydraulic support 5 after hydraulic drive mechanism 7 stretches to make hydraulic support 5 can support the coal seam top. The number of hydraulic mount bases 6 is plural, and the hydraulic mount bases 6 each extend toward the coal face, and the cross section of the hydraulic mount base 6 is substantially rectangular.
In order to allow the support base 11 to be effectively fixed to the hydraulic mount base 6. As shown in fig. 2, the support base 11 in the present embodiment includes: backup pad, first fixed plate, second fixed plate and locking screw, first fixed plate and second fixed plate are parallel to each other and are connected to the opposite both sides of backup pad respectively, and first fixed plate is provided with the screw hole that runs through towards the second fixed plate, locking screw threaded connection is to the screw hole on the first fixed plate.
It will be appreciated that the first fixing plate, the support plate and the second fixing plate are connected in sequence and formed in a generally U-shaped structure, and that the locking screw threaded on the first fixing plate can be moved toward the second fixing plate.
In actual use, when the support base 11 needs to be fixed on the hydraulic support base 6, the U-shaped opening formed by the support base 11 can be clamped to the top of the hydraulic support base 6. Then, the locking screw connected to the first fixing plate is rotated, the locking screw can move toward the second fixing plate in the process of rotation, and after the locking screw is fully abutted to the hydraulic support base 6, the second fixing plate and the locking screw can jointly clamp the hydraulic support base 6, so that the fixing of the support base 11 can be achieved.
Further, in order to improve the locking fixing effect, the number of the threaded holes on the first fixing plate is multiple, the multiple threaded holes are arranged at intervals along the length direction of the first fixing plate, and locking screws are arranged in each threaded hole.
In this embodiment, the first fixing plate and the second fixing plate are respectively connected to two sides of the length direction of the support plate, and meanwhile, the first fixing plate and the second fixing plate both extend along the width direction of the support plate, and the length direction of the first fixing plate and the second fixing plate is in the same direction as the width direction of the support plate. Thereby, by means of the plurality of locking screws, the first fixing plate can form a plurality of abutment points with the hydraulic mount base 6 in the width direction of the support plate, thereby achieving more effective fixation.
Optionally, the second fixing plate is provided with a threaded hole penetrating toward the first fixing plate, and the locking screw is screwed to the threaded hole on the second fixing plate.
It will be appreciated that a locking screw may also be provided on the second fixing plate. In actual use, when the U-shaped opening formed by the support base 11 is clamped to the top of the hydraulic support base 6, the locking screws on the first fixing plate and the second fixing plate can be simultaneously rotated, and the hydraulic support base 6 is clamped by the locking screws on two sides, so that the spraying support 1 is fixed on the hydraulic support base 6.
Similarly, the number of the screw holes on the second fixing plate is plural, the plural screw holes are arranged at intervals along the length direction of the second fixing plate, and a locking screw is provided in each screw hole.
In a specific embodiment, two locking screws are respectively disposed on the first fixing plate and the second fixing plate. Therefore, the supporting base 11 can be fixedly mounted on the hydraulic support base 6 by means of four locking screws, the dismounting is convenient and flexible, complex operations such as perforating and welding are not required to be performed on the hydraulic support base 6, the use cost can be reduced, and the applicability can be improved.
Alternatively, the post 12 may be threadably secured to the top of the support plate. For example, the support plate is provided with a screw hole extending in the thickness direction thereof, the bottom end of the column 12 has a screw structure, and the screw structure of the bottom end of the column 12 can be screw-coupled to the screw hole of the support plate. Therefore, the upright post 12 can be fixed, and the upright post 12 can be conveniently disassembled, replaced and stored.
Alternatively, the bottom ends of the uprights 12 may be welded to the support plate. At this time, the upright posts 12 and the supporting plate are fixed together, so that effective fixation of the upright posts 12 can be realized.
In one embodiment, in order to more effectively fix the upright 12, the spray coating bracket 1 further comprises a reinforcing column, one end of which is fixedly connected to the upright 12 and the other end of which is fixedly connected to the top of the support base 11. Illustratively, the reinforcing column may be detachably connected to the upright 12 or the support base 11 by means of a bolt or the like, or may be fixedly connected to the upright 12 or the support base 11 by welding.
In addition, the spray bracket 1 is fixed to the front side of the coal wall, and in order to ensure that the spray material is sufficiently sprayed onto the coal wall, it is generally necessary to appropriately adjust the nozzle installation height and the spray angle according to the height of the coal wall and the distance between the coal walls.
In one embodiment, as shown in fig. 5, after the spray bracket 1 is mounted on the hydraulic bracket base 6, if the distance between the nozzle 13 and the coal wall 8 is G and the height of the coal wall 8 is H, the elevation angle a of the spray of the nozzle 13 needs to be ensured 1 And spray depression angle a 2 The relationship with the distance G between the coal walls 8 satisfies the following relationship:
G×[tan(a 1 )+tan(a 2 )]≥H。
therefore, the coal wall rib spraying reinforcing device in the embodiment has the following advantages:
the coal wall ledge spraying reinforcing apparatus in this embodiment includes spraying support, pneumatic grouting pump, guniting pipeline and control system, and the spraying support includes: the spraying bracket can be fixed on the hydraulic bracket base, and spraying materials can be sprayed to the surface of the coal wall by means of the spraying bracket, so that a film protection layer is formed on the surface of the coal wall, and the supporting effect of preventing the coal wall from forming a ledge is achieved. Moreover, the device has the advantages of simple structure, reliable system, flexible spraying operation, high construction efficiency and the like, and can effectively grasp the ledge prevention and control time window after implementation.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A coal wall panel upper spray reinforcement device, comprising: the pneumatic grouting pump is connected to the spraying bracket through the grouting pipeline, the control system is electrically connected with the pneumatic grouting pump,
wherein, the spraying support includes: support base, stand and nozzle, the one end of stand is connected to support the base, the other end of stand with the nozzle is connected, the inside of stand is provided with along its axial direction extension's slip casting passageway, the stand be close to support the one end of base still be provided with the mounting hole of slip casting passageway intercommunication, the slip casting pipeline is connected to the mounting hole, and the slip casting pipeline is via slip casting passageway with nozzle fluid communication.
2. The coal wall panel upper spray reinforcement device of claim 1, wherein the nozzle is a right angle solid conical nozzle.
3. The coal wall panel upper spray reinforcement device of claim 1, wherein the support base comprises: the support plate, first fixed plate, second fixed plate and locking screw, first fixed plate with the second fixed plate is parallel to each other and be connected to respectively the opposite sides of backup pad, first fixed plate is provided with the orientation the screw hole that the second fixed plate runs through, locking screw threaded connection to on the first fixed plate the screw hole.
4. The coal wall panel upper spray reinforcement device of claim 3, wherein the number of the threaded holes in the first fixing plate is plural, the plural threaded holes are arranged at intervals along the length direction of the first fixing plate, and the locking screw is provided in each threaded hole.
5. The coal wall panel spray reinforcement device of claim 3, wherein the second fixing plate is provided with a threaded hole penetrating toward the first fixing plate, and the locking screw is screwed to the threaded hole on the second fixing plate.
6. The coal wall panel upper spray reinforcement device of claim 5, wherein the number of the threaded holes in the second fixing plate is a plurality of the threaded holes arranged at intervals along the length direction of the second fixing plate, and the locking screw is arranged in each threaded hole.
7. The coal wall panel spray reinforcement device of claim 1, wherein the top end of the post is provided with a nut via which the nozzle is threadably connected to the top end of the post.
8. A coal wall panel upper spray reinforcement device according to claim 3, wherein the support plate is provided with a threaded hole extending in a thickness direction thereof, the bottom end of the upright post has a threaded structure, and the bottom end of the upright post is screwed to the support plate.
9. The coal wall panel upper spray reinforcement device of claim 3, wherein the bottom ends of the uprights are connected to the support plate by welding.
10. The coal wall panel upper spray reinforcement device of claim 3, wherein the spray bracket further comprises a reinforcing post, one end of the reinforcing post is fixedly connected to the upright post, and the other end is fixedly connected to the top of the support base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322387079.5U CN220726311U (en) | 2023-09-04 | 2023-09-04 | Spraying and reinforcing device for coal wall rib |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322387079.5U CN220726311U (en) | 2023-09-04 | 2023-09-04 | Spraying and reinforcing device for coal wall rib |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220726311U true CN220726311U (en) | 2024-04-05 |
Family
ID=90497030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322387079.5U Active CN220726311U (en) | 2023-09-04 | 2023-09-04 | Spraying and reinforcing device for coal wall rib |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220726311U (en) |
-
2023
- 2023-09-04 CN CN202322387079.5U patent/CN220726311U/en active Active
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