CN112963192B - Circulating flame-retardant device and method for goaf under mine - Google Patents
Circulating flame-retardant device and method for goaf under mine Download PDFInfo
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- CN112963192B CN112963192B CN202110321742.4A CN202110321742A CN112963192B CN 112963192 B CN112963192 B CN 112963192B CN 202110321742 A CN202110321742 A CN 202110321742A CN 112963192 B CN112963192 B CN 112963192B
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003063 flame retardant Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005507 spraying Methods 0.000 claims abstract description 267
- 239000003245 coal Substances 0.000 claims abstract description 168
- 238000005065 mining Methods 0.000 claims abstract description 150
- 239000007921 spray Substances 0.000 claims abstract description 75
- 230000006698 induction Effects 0.000 claims abstract description 66
- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 230000008569 process Effects 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a circulating flame-retardant device and a circulating flame-retardant method for a goaf under a mine, wherein the device comprises a guide base arranged on a base of a hydraulic support group of a coal mining machine and a spraying device which slides on the guide base in a reciprocating manner, wherein the spraying device sprays a stopping agent to the goaf behind the hydraulic support of the coal mining machine; a signal induction mechanism for controlling the spraying device to work is arranged between every two adjacent guide units; the method comprises the following steps: 1. initial positioning of the spraying device; 2. forward movement and spraying of the spraying device; 3. reversing the spray head assembly; 4. the spraying device moves reversely and sprays; 5. the restoration of the spray head component and the supplementary spraying of the inhibitor are carried out; 6. and (5) circulating operation until coal mining operation is finished. The invention sprays the retardant in time to the goaf behind the coal mining machine hydraulic support in the work of the coal mining machine hydraulic support, so that the flame-retardant area of the goaf has no dead angle, the safety of coal mining work is ensured, and the popularization and the use are convenient.
Description
Technical Field
The invention belongs to the technical field of coal mine safety equipment, and particularly relates to a goaf circulating flame-retardant device and method used under a mine.
Background
In the coal mining process, underground coal resources need to be mined and transported away, tunnels from underground coal positions to coal mine mouths are gradually opened by adopting a method similar to a method of passing through mountains and tunnels on roads in the tunneling process, ores, coals and the like encountered in the mining process are generally transported to the ground so as to form a reasonable transportation and mining operation surface, and a coal goaf is formed underground along with continuous transportation of the coals and other ores. The application of different mining technologies lets the spontaneous combustion problem of collecting space area coal alleviate to some extent, but collecting space area remains the coal, it is still comparatively general to lose the coal condition, coal face is because mobility and can not absolute sealed characteristic, the air current leaks to collecting space area in the mine, make oxygen in the air and coal take place slow oxidation reaction, the release heat, when the heat accumulation to certain extent, the coal body begins to burn, finally take place the spontaneous combustion of the common collecting space area coal in reality, serious can arouse the conflagration of large tracts of land, gas explosion even.
The existing technology for preventing coal spontaneous combustion by spraying inhibitor to the goaf under the mine generally adopts the modes of spraying on the surface of a coal seam and injecting coal body by using a drill hole. The surface spraying is to spray from the support clearance to the goaf, every 5 groups of supports are sprayed for 1 time, each time at least 6min, and the flow is not less than 35L/min; and (3) drilling and pressing the injection retardant for the coal body which can be oxidized or already starts to be oxidized and generate heat. However, these methods all have the disadvantages that the inhibitor is not easy to be sprayed uniformly, the flame retardant effect is not uniform, the spraying points are far apart, the coverage area is easily affected by environmental factors, the amount of the inhibitor required for one time is large, the cost is high, and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a goaf circulating flame retardant device used under a mine aiming at the defects in the prior art, the design is novel and reasonable, a retardant is sprayed on a goaf behind a currently propelled hydraulic support of a coal mining machine when a spraying device moves forwards, a retardant is sprayed on a goaf behind a coal mining machine hydraulic support which is not propelled at the side on the currently unforged hydraulic support of the coal mining machine when the spraying device moves backwards, a spray head assembly is controlled to rotate reversely between the forward movement and the backward movement so as to adapt to the spraying requirements of different strokes, and then, a retardant is subjected to spraying on the goaf behind the hydraulic support of the coal mining machine where an initial guiding unit is located, so that a flame retardant area of the goaf has no dead angle, the safety of coal mining work is ensured, and the device is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a collecting space area circulation flame retardant device for under mine which characterized in that: the device comprises a guide base and a spraying device, wherein the guide base is arranged on a base of a coal mining machine hydraulic support group and is distributed along the width direction of a gob;
a signal sensing mechanism for controlling the spraying device to work is arranged between every two adjacent guide units, and the signal sensing mechanism comprises an infrared signal transmitter arranged at one end part of one guide unit and an infrared signal receiver arranged at the other end part of the other guide unit and matched with the infrared signal transmitter;
the spraying device comprises a movable base, a storage tank, a telescopic discharge pipe, a spray head assembly and a rotation control mechanism, wherein the movable base is moved along the guide unit, the storage tank is arranged on the movable base, the telescopic discharge pipe is communicated with the inside of the storage tank and stretches along the advancing direction of the hydraulic support of the coal mining machine, the spray head assembly is rotatably connected with the telescopic discharge pipe and is used for spraying a stopping agent to a goaf behind the hydraulic support of the coal mining machine, and the rotation control mechanism is used for controlling the spray head assembly to rotate by taking the central line of the telescopic discharge pipe as a rotating shaft.
The goaf circulating flame-retardant device for the mine is characterized in that: the laser spraying device comprises a guide base, a spraying device and a guide unit, wherein the guide unit is arranged at one end of the guide base, a first position sensing device for sensing the position of the spraying device is arranged on the guide unit, the guide unit is arranged at the other end of the guide base, a second position sensing device for sensing the position of the spraying device is arranged on the guide unit, and the first position sensing device and the second position sensing device are laser opposite emitters.
The goaf circulating flame-retardant device for the mine is characterized in that: the shower nozzle subassembly include with flexible discharging pipe rotate the spray tube of connecting, keep away from the hollow reposition of redundant personnel seat of flexible discharging pipe one end intercommunication with the spray tube and with the nozzle mount pad of hollow reposition of redundant personnel seat intercommunication and set up the nozzle on the nozzle mount pad, be provided with two magnetic hose between hollow reposition of redundant personnel seat and the nozzle mount pad, magnetic hose rotates with hollow reposition of redundant personnel seat to be connected, magnetic hose and nozzle mount pad fixed connection, still be provided with on the hollow reposition of redundant personnel seat and be used for controlling magnetic hose pivoted arc magnetic induction coil, arc magnetic induction coil wears to establish between two magnetic hose.
The goaf circulating flame-retardant device for the mine is characterized in that: the rotation control mechanism comprises a driving gear arranged on the outer side of the extending end of the telescopic discharging pipe, a driving motor for controlling the driving gear to rotate and a driven gear fixedly sleeved on the spraying pipe and in transmission connection with the driving gear, and the width of the driven gear is larger than that of the driving gear.
The goaf circulating flame-retardant device for the mine is characterized in that: the guiding unit comprises a base arranged on a base of the coal mining machine hydraulic support and guide rails embedded on the base, the upper surfaces of the guide rails are flush, and the infrared signal transmitter and the infrared signal receiver are arranged on the guide rails.
The goaf circulating flame-retardant device for the mine is characterized in that: the telescopic discharge pipe is communicated with the storage tank sequentially through the horizontal elbow installation pipe and the vertical elbow pipeline.
The goaf circulating flame-retardant device for the mine is characterized in that: the spraying device further comprises a controller, the spraying device and the mobile base are controlled by the controller, and the infrared signal receiver, the first position sensing device and the second position sensing device are all in wireless connection with the controller through a wireless communication module.
Meanwhile, the invention also discloses a method which has simple steps and reasonable design and can spray the stopping agent to the goaf in time without dead angles, and the method is characterized by comprising the following steps:
step one, initial positioning of a spraying device:
the guide unit where the first position sensing device is located is used as an initial guide unit, the guide unit where the second position sensing device is located is used as a reversing guide unit, the guide unit located between the initial guide unit and the reversing guide unit is used as a middle guide unit, a spraying starting line is marked on the initial guide unit, and the vertical projection of a laser line emitted by the first position sensing device on the initial guide unit is superposed with the spraying starting line;
placing the spraying device on the initial guide unit, enabling the spray head assembly to face the initial guide unit, enabling the telescopic discharge pipe to retract, enabling the movable base to drive the spraying device to move until the first position sensing device senses the spraying device, stopping moving, and waiting for the start of coal mining work;
step two, forward movement and spraying of the spraying device:
the forward moving direction of the spraying device is the moving direction of the spraying device from the initial guide unit to the reversing guide unit; the specific process comprises the following steps:
step 201, after the hydraulic support of the coal mining machine where the initial guide unit is located pushes the coal mining machine forward, the signal induction mechanism between the initial guide unit and the adjacent middle guide unit is disconnected in induction, at the moment, the spraying device is controlled to perform forward spraying operation, the process of the forward spraying operation is that the telescopic discharge pipe extends to drive the spray head assembly to move to the rear side of the hydraulic support of the coal mining machine, the telescopic discharge pipe extends, the spray head assembly starts to spray a retardant to a goaf right behind the currently pushed hydraulic support of the coal mining machine, after the spraying is finished, the telescopic discharge pipe retracts, the forward spraying operation is finished, and the next forward spraying operation is waited;
202, when a hydraulic support of the coal mining machine where the middle guide unit adjacent to the initial guide unit is located is pushed forward to the coal mining machine, the middle guide unit is communicated with the initial guide unit adjacent to the middle guide unit in an induction mode through the signal induction mechanism, the movable base drives the spraying device to move forward to a spraying point position on the current middle guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
203, after the next coal mining machine hydraulic support is pushed forward to a coal mining machine, the signal induction mechanism between the guide unit on the current coal mining machine hydraulic support and the previous middle guide unit is in induction communication, the movable base drives the spraying device to move forward to a spraying point position on the current guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
step 204, circularly executing step 203, until the second position sensing device senses that the spraying device advances to the reversing guide unit, and after the forward spraying operation on the reversing guide unit is finished, executing step three;
step three, reversing the spray head assembly:
after the last forward spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe as a rotating shaft;
step four, reverse movement and spraying of the spraying device:
the reverse moving direction of the spraying device is the moving direction of the spraying device from the reversing guide unit to the initial guide unit; the specific process comprises the following steps:
step 401, when a hydraulic support of the coal mining machine where the reversing guide unit is located is pushed forward to the coal mining machine, namely the reversing guide unit is communicated with the signal induction mechanism between the adjacent middle guide units in an induction manner, the spraying device is controlled to move reversely to the spraying point position of the lateral middle guide unit;
402, when the hydraulic support of the coal mining machine where the reversing guide unit is located is pushed forward to a coal mining machine, the signal sensing mechanism between the reversing guide unit and the adjacent middle guide unit is disconnected in sensing, the spraying device is controlled to perform reverse spraying operation at the moment, the reverse spraying operation is carried out in a process that the telescopic discharge pipe extends to drive the spray head assembly to move towards the rear side of the hydraulic support of the coal mining machine, the telescopic discharge pipe extends to spray a stopping agent to a goaf right behind the front pushed hydraulic support of the coal mining machine, after the spraying is finished, the telescopic discharge pipe retracts, and the reverse spraying operation is finished;
step 403, before the hydraulic support of the coal mining machine where the spraying device is located is pushed forward, namely when the guiding unit where the spraying device is located is communicated with the guiding unit which is adjacent in the opposite direction in an induction manner through the signal induction mechanism, controlling the spraying device to move in the opposite direction to the spraying point position of the next guiding unit;
404, after a hydraulic bracket of a coal mining machine, which is positioned at the spraying device, of a previous hydraulic bracket of the coal mining machine is pushed forwards, the induction of the signal induction mechanism is disconnected, and at the moment, the spraying device is controlled to perform reverse spraying operation;
step 405, circularly executing the steps 403 to 404 until the first position sensing device senses that the spraying device advances to the initial guiding unit, and executing a fifth step after the spraying device on the initial guiding unit performs the reverse spraying operation on the goaf right behind the hydraulic support of the previous pushed coal mining machine;
step five, restoration of the spray head assembly and supplementary spraying of the stopping agent:
after the last reverse spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe as a rotating shaft, so that the spray head assembly faces the initial guide unit;
secondly, performing supplementary spraying of a stopping agent on a goaf right behind the coal mining machine hydraulic support where the initial guiding unit is located, wherein the supplementary spraying process is the same as the forward spraying process, and thus completing one stopping agent spraying cycle;
and step six, circulating the step two to the step five, and circularly spraying the stopping agent on the goaf until the coal mining operation is finished.
Compared with the prior art, the invention has the following advantages:
1. the goaf circulating flame-retardant device is provided with the guide base, the guide base connects the plurality of coal mining machine hydraulic supports, the spraying device can move along with the movement of the plurality of coal mining machine hydraulic supports, the goaf flame-retardant track is clear, in addition, the guide base is arranged in the coal mining machine hydraulic supports, the safety of the spraying device can be ensured while the coal mining work is not interfered, the operation process is smooth and reliable, the guide part serving as the spraying device is stable in structure, and the anti-interference capability is strong.
2. According to the goaf circulating flame-retardant device, whether two adjacent coal mining machine hydraulic supports are flush or not is automatically judged by arranging the signal induction mechanism, the induction signal is accurate, displacement information can be accurate to micrometer in an unmanned coal mine, after the signal induction mechanism is communicated in an induction mode, the two corresponding guide units can accurately form a moving channel of the spraying device, the spraying device is prevented from being clamped and stopped, the normal movement of the spraying device is guaranteed, the goaf circulating flame-retardant device is reliable and stable, and the using effect is good.
3. According to the goaf circulating flame-retardant device, the spraying device is arranged to spray the stopping agent to the goaf behind the coal mining machine hydraulic support, the whole goaf is divided into a plurality of sub-areas according to the coal mining machine hydraulic support to perform flame-retardant operation, and the stopping agent is prevented from being sprayed and omitted.
4. According to the goaf circulating flame-retardant device, the spray heads are conveyed to the space between two adjacent staggered coal mining machine hydraulic supports through the telescopic discharge pipes, then the retardant is sprayed, the working gap of the coal mining machine hydraulic supports is ingeniously utilized to conduct flame-retardant operation, normal coal mining operation is not affected, meanwhile, the retardant spraying operation is conducted on the goaf in time in the advancing process of the coal mining machine, the retardant can be uniformly sprayed, the efficiency is high, the safety is good, and manpower and material resources are saved.
In conclusion, the spraying device is novel and reasonable in design and simple in steps, stopping agent spraying is carried out on the goaf behind the currently propelled coal mining machine hydraulic support when the spraying device moves forwards, stopping agent spraying is carried out on the goaf behind the coal mining machine hydraulic support which is not pushed forwards at present on the coal mining machine hydraulic support which is not pushed forwards at present, the spray head assembly is controlled to rotate reversely between the forward movement and the reverse movement to meet the spraying requirements of different strokes, then stopping agent complementary spraying is carried out on the part, where the initial guiding unit is located, behind the coal mining machine hydraulic support, where the initial guiding unit is located, so that a flame-retardant area of the goaf is free of dead corners, the safety of coal mining work is guaranteed, and the spraying device is convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a goaf circulating flame-retardant device adopted in the invention.
FIG. 2 is a view showing the expanded use state of the telescopic spout shown in FIG. 1.
Fig. 3 is a top view of the spraying device of fig. 1.
Fig. 4 is a rear view of the sprinkler of fig. 1.
FIG. 5 is a block flow diagram of the method of the present invention.
Description of the reference numerals:
1-hydraulic support of coal mining machine; 2-an infrared signal emitter; 3-an infrared signal receiver;
4, moving the base; 5-a storage tank; 6, stretching a discharge pipe;
7-a first position sensing device; 8-second position sensing means; 9-a spray pipe;
10-hollow shunting seat; 11-nozzle mount; 12-a nozzle;
13-magnetic hose; 14-arc magnetic induction coil; 15-a driving gear;
16-a driven gear; 17-a base; 18-a guide rail;
19-horizontal elbow mounting pipe; 20-vertical elbow pipes; 21-driving the motor.
Detailed Description
As shown in fig. 1 to 4, the goaf circulating flame retardant device used under a mine comprises a guide base which is arranged on a base of a coal mining machine hydraulic support group and is distributed along the width direction of the goaf and a spraying device which slides on the guide base in a reciprocating manner, wherein the coal mining machine hydraulic support group comprises a plurality of coal mining machine hydraulic supports 1, the guide base comprises a plurality of guide units, the guide units and the coal mining machine hydraulic supports 1 are the same in number and are in one-to-one correspondence, and the spraying device sprays a retardant to the goaf behind the coal mining machine hydraulic supports 1;
a signal induction mechanism for controlling the spraying device to work is arranged between every two adjacent guide units, and the signal induction mechanism comprises an infrared signal emitter 2 arranged at one end of one guide unit and an infrared signal receiver 3 arranged at the other end of the other guide unit and matched with the infrared signal emitter 2;
the spraying device comprises a movable base 4, a storage tank 5, a telescopic discharge pipe 6, a spray head assembly and a rotation control mechanism, wherein the movable base 4 is moved along the guide unit, the storage tank 5 is arranged on the movable base 4, the telescopic discharge pipe 6 is communicated with the interior of the storage tank 5 and stretches and retracts along the advancing direction of the coal mining machine hydraulic support 1, the spray head assembly is rotatably connected with the telescopic discharge pipe 6 and is used for spraying a stopping agent to a goaf behind the coal mining machine hydraulic support 1, and the rotation control mechanism is used for controlling the spray head assembly to rotate by taking the central line of the telescopic discharge pipe 6 as a rotating shaft.
In this embodiment, a liquid supply pump is provided in the storage tank 5.
In this embodiment, infrared signal emitter 2 and infrared signal receiver 3 are adjacent two position about between the guide unit can set up wantonly, and the relative position of infrared signal emitter 2 and infrared signal receiver 3 among a plurality of signal induction mechanism also can be different, makes signal induction mechanism dismantle simple to operate.
In this embodiment, the distance between two adjacent guide units is 90 mm-110 mm, and the movable base 4 can easily pass through the gap and ensure the stable operation of the spraying device.
It should be noted that a plurality of coal mining machine hydraulic supports 1 are arranged along a coal mining working face, during actual coal mining operation, the plurality of coal mining machine hydraulic supports 1 sequentially advance a coal mining machine, in the process that the plurality of coal mining machine hydraulic supports 1 sequentially advance the coal mining machine, a plurality of signal induction mechanisms are connected or disconnected, the connection and disconnection signals of the signal induction mechanisms are used as command signals for moving and spraying of the spraying device, when two adjacent guide units are parallel and level, the signal induction mechanisms are connected, the spraying device can move from one guide unit to the next guide unit, and spraying of the stopping agent is carried out on a goaf behind the coal mining machine hydraulic support 1 where the next guide unit is located through a space formed by staggering between the next guide unit and the next guide unit, so that normal coal mining operation is not affected, and meanwhile, spraying operation of the stopping agent is carried out on the goaf in time in the advancing process of the coal mining machine, so that the stopping agent can be uniformly sprayed, the efficiency is high, the safety is good, and manpower and material resources are saved.
The inhibitor has a two-layer structure, wherein the capsule material senses the change of the environmental temperature, so that a core material with a flame-retardant effect can be released, the core material is sprayed into the goaf, and a layer of bonded flame-retardant layer film can be formed on the surface of the coal falling of the goaf, on one hand, oxygen in air is prevented from contacting with coal, and on the other hand, the flame-retardant material in the goaf can further prevent spontaneous combustion of the coal, so that the inhibitor is sprayed timely and uniformly, the inhibitor moves along with the movement of the hydraulic support 1 of the coal mining machine and then sprays the inhibitor to the newly-appeared goaf in time, the inhibitor has an excellent effect, no flame-retardant blind area exists, and the use effect is good.
The guiding base is arranged to connect the plurality of coal mining machine hydraulic supports 1, so that the spraying device can move along with the movement of the plurality of coal mining machine hydraulic supports, the flame-retardant track of the goaf is clear, and in addition, the guiding base is arranged in the coal mining machine hydraulic supports 1, the safety of the spraying device can be ensured while the coal mining work is not interfered, the operation process is smooth and reliable, the structure of the guiding component serving as the spraying device is stable, and the anti-interference capability is strong;
the signal induction mechanism is arranged to automatically judge whether the two adjacent coal mining machine hydraulic supports 1 are flush, induction signals are accurate, displacement information can be accurate to micrometer in an unmanned coal mine, and after the signal induction mechanism is communicated in an induction mode, the two corresponding guide units can accurately form a moving channel of the spraying device, so that the spraying device is prevented from being stuck and stopped, and the normal movement of the spraying device is ensured;
the spraying device is arranged to spray the stopping agent to the rear goaf of the coal mining machine hydraulic support 1, the whole goaf is divided into a plurality of subareas according to the coal mining machine hydraulic support 1 to perform flame-retardant operation, and the stopping agent is prevented from being sprayed and omitted;
the spray head is conveyed to the space between two adjacent staggered coal mining machine hydraulic supports 1 through the telescopic discharge pipe 6, then spraying of the stopping agent is carried out, the working gap of the coal mining machine hydraulic supports 1 is ingeniously utilized to carry out flame-retardant operation, normal coal mining operation is not affected, meanwhile, in the process of pushing the coal mining machine, the stopping agent is sprayed in time on a goaf, the stopping agent can be uniformly sprayed, the efficiency is high, the safety is good, and manpower and material resources are saved.
The method adopted by the invention has simple steps, the stopping agent is sprayed to the goaf behind the currently propelled hydraulic support 1 of the coal mining machine when the spraying device moves forwards, the stopping agent is sprayed to the goaf behind the hydraulic support 1 of the coal mining machine which is close to and propelled when the spraying device does not move backwards, the spray head assembly is controlled to rotate reversely between the forward movement and the backward movement so as to adapt to the spraying requirements of different strokes, and then the stopping agent is subjected to the spraying supplement to the rear part of the hydraulic support 1 of the coal mining machine where the initial guiding unit is located, so that the flame-retardant area of the goaf has no dead angle, and the safety of the coal mining operation is ensured.
In this embodiment, the guiding unit located at one end of the guiding base is provided with a first position sensing device 7 for sensing the position of the spraying device, the guiding unit located at the other end of the guiding base is provided with a second position sensing device 8 for sensing the position of the spraying device, and the first position sensing device 7 and the second position sensing device 8 are both laser emitters.
In this embodiment, a spraying start line is marked on the initial guiding unit, a vertical projection of the laser line sent by the first position sensing device 7 on the initial guiding unit coincides with the spraying start line, when the body of the spraying device touches the laser line sent by the first position sensing device 7 in the forward moving process, the controller receives the signal to indicate that the spraying device is located at a circulating flame-retardant initial point position, so that circulating flame-retardant operation can be performed according to set method steps, and the second position sensing device 8 can be arranged at any position of the spraying device on the traveling path of the reversing guiding unit, so as to detect that the spraying device has traveled to the reversing guiding unit, thereby performing a backward reversing step.
In this embodiment, the laser lines of the first position sensing device 7 and the second position sensing device 8 are higher than the upper surface of the guide rail 18, so that the first position sensing device 7 and the second position sensing device 8 can only detect the position of the spraying device.
In this embodiment, the shower nozzle subassembly include with flexible discharging pipe 6 rotate spray tube 9 of connecting, keep away from the hollow reposition of redundant personnel seat 10 of flexible discharging pipe 6 one end intercommunication with spray tube 9 and with the nozzle mount pad 11 of hollow reposition of redundant personnel seat 10 intercommunication and set up nozzle 12 on nozzle mount pad 11, be provided with two magnetic hose 13 between hollow reposition of redundant personnel seat 10 and the nozzle mount pad 11, magnetic hose rotates with hollow reposition of redundant personnel seat 10 to be connected, magnetic hose 13 and 11 fixed connection of nozzle mount pad, still be provided with on the hollow reposition of redundant personnel seat 10 and be used for controlling 13 pivoted arc magnetic induction coil 14 of magnetic hose, arc magnetic induction coil 14 wears to establish between two magnetic hose 13.
In the embodiment, the included angle between the injection direction of the nozzle 12 and the central line of the telescopic discharge pipe 6 is 90 degrees, the telescopic discharge pipe 6 extends towards the rear side of the hydraulic support 1 of the coal mining machine to drive the spray pipe 9 to move towards the right rear side of the hydraulic support 1 of the coal mining machine, and the spraying operation of the stopping agent in the goaf is realized.
In this embodiment, the two magnetic hoses 13 wrap the arc-shaped magnetic induction coil 14, so as to prevent the nozzle 12 from shaking when the arc-shaped magnetic induction coil 14 is not powered on.
In this embodiment, the outer wall of the telescopic discharge pipe 6 is provided with an external thread, the inner wall of the spray pipe 9 is provided with an internal thread matched with the external thread, the length of the internal thread is 15 cm-20 cm, the stability of the spray pipe 9 when driving the nozzle 12 to rotate is ensured, and the rotation control mechanism can drive the spray pipe 9 to rotate.
In the embodiment, the arc-shaped magnetic induction coils 14 are vertically arranged, and the nozzles 12 are controlled to swing up and down, so that the spraying range of the stopping agent along the width direction of the hydraulic support 1 of the coal mining machine is wider; in addition, the arc-shaped magnetic induction coils 14 can be horizontally arranged, and the nozzles 12 are controlled to swing left and right, so that the spraying range of the stopping agent to the rear part of the hydraulic support 1 of the coal mining machine is wider.
In this embodiment, the direction and time of the current flowing through the arc-shaped magnetic induction coil 14 are controlled by the controller.
It should be noted that the operating principle of the spray head assembly is that when the spray nozzle 12 reaches the spraying position, the arc-shaped magnetic induction coil 14 is controlled to be energized to form a magnetic field, at this time, the magnetic hose 13 can move along the arc-shaped magnetic induction coil 14 in an arc-shaped path under the action of the magnetic field, so as to drive the spray nozzle 12 to move, so as to form a fan-shaped spraying area, the direction of the magnetic field is changed by controlling the energization direction of the arc-shaped magnetic induction coil 14, so that the spray nozzle 12 is controlled to move in different directions, and the circular spraying is performed.
In this embodiment, the rotation control mechanism includes a driving gear 15 disposed outside the extending end of the telescopic discharging pipe 6, a driving motor for controlling the driving gear 15 to rotate, and a driven gear 16 fixedly sleeved on the spraying pipe 9 and in transmission connection with the driving gear 15, wherein the width of the driven gear 16 is greater than the width of the driving gear 15.
It should be noted that the driving gear 15 drives the driven gear 16 to rotate, and at the same time, the driving gear 15 moves back and forth on the side wall of the driven gear 16.
In this embodiment, the guiding unit includes a base 17 disposed on a base of the hydraulic support 1 of the coal mining machine and guide rails 18 embedded on the base 17, upper surfaces of the guide rails 18 are flush, and the infrared signal transmitter 2 and the infrared signal receiver 3 are both disposed on the guide rails 18.
In this embodiment, the distance between two adjacent guide rails 18 is 90mm to 110mm.
In this embodiment, the upper surface of the base 17 is concave, the guide rail 18 is convex, the bottom of the guide rail 18 is stably embedded in the groove of the base 17, the environmental vibration resistance is strong, and the structure is stable.
In this embodiment, the telescopic discharge pipe 6 is communicated with the storage tank 5 sequentially through a horizontal elbow installation pipe 19 and a vertical elbow pipeline 20.
In this embodiment, the storage tank 5 is provided with a feed inlet.
In this embodiment, the horizontal elbow installation pipe 19 is used for installing the telescopic discharging pipe 6.
In this embodiment, the spraying device further comprises a controller, the spraying device and the mobile base 4 are controlled by the controller, and the infrared signal receiver 3, the first position sensing device 7 and the second position sensing device 8 are all in wireless connection with the controller through a wireless communication module.
In this embodiment, each infrared signal receiver 3 is provided with a sub wireless communication module which communicates with the controller through the wireless communication module.
The goaf circulating flame-retardant method shown in fig. 5 comprises the following steps:
step one, initial positioning of a spraying device:
the guide unit where the first position sensing device 7 is located is taken as an initial guide unit, the guide unit where the second position sensing device 8 is located is taken as a reversing guide unit, the guide unit located between the initial guide unit and the reversing guide unit is taken as a middle guide unit, a spraying starting line is marked on the initial guide unit, and the vertical projection of the laser line emitted by the first position sensing device 7 on the initial guide unit is superposed with the spraying starting line;
placing the spraying device on the initial guide unit, enabling the spray head assembly to face the initial guide unit, enabling the telescopic discharge pipe 6 to retract, enabling the movable base 4 to drive the spraying device to move until the first position sensing device 7 senses the spraying device and then stops moving, and waiting for the start of coal mining work;
step two, forward movement and spraying of the spraying device:
the forward moving direction of the spraying device is the moving direction of the spraying device from the initial guide unit to the reversing guide unit; the specific process comprises the following steps:
step 201, after the coal mining machine hydraulic support 1 where the initial guide unit is located forwards pushes a coal mining machine, the signal induction mechanism between the initial guide unit and the adjacent middle guide unit is disconnected in induction, at the moment, the spraying device is controlled to perform forward spraying operation, the forward spraying operation is performed in a way that the telescopic discharge pipe 6 extends to drive the spray head assembly to move towards the rear side of the coal mining machine hydraulic support 1, the telescopic discharge pipe 6 extends, the spray head assembly starts to spray a stopping agent to a goaf right behind the currently pushed coal mining machine hydraulic support 1, after the spraying is finished, the telescopic discharge pipe 6 retracts, the forward spraying operation is finished, and the next forward spraying operation is waited;
step 202, after the hydraulic support 1 of the coal mining machine where the middle guide unit adjacent to the initial guide unit is located is pushed forward to the coal mining machine, the middle guide unit is communicated with the signal induction mechanism between the adjacent initial guide units in an induction manner, the movable base 4 drives the spraying device to move forward to a spraying point position on the current middle guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
203, after the next coal mining machine hydraulic support 1 is pushed forward to a coal mining machine, the signal induction mechanism between the guide unit on the current coal mining machine hydraulic support 1 and the previous middle guide unit is in induction communication, the movable base 4 drives the spraying device to move forward to a spraying point position on the current guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
step 204, circularly executing step 203 until the second position sensing device 8 senses that the spraying device advances to the reversing guide unit, and executing step three after the forward spraying operation on the reversing guide unit is finished;
step three, reversing the spray head assembly:
after the last forward spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe 6 as a rotating shaft;
step four, reverse movement and spraying of the spraying device:
the reverse moving direction of the spraying device is the moving direction of the spraying device from the reversing guide unit to the initial guide unit; the specific process comprises the following steps:
step 401, when the hydraulic support 1 of the coal mining machine where the reversing guide unit is located is pushed forward to the coal mining machine, namely the reversing guide unit is communicated with the signal induction mechanism between the adjacent middle guide units in an induction mode, controlling the spraying device to move reversely to the spraying point position of the lateral middle guide unit;
step 402, after the coal mining machine hydraulic support 1 where the reversing guide unit is located is pushed forward to a coal mining machine, the signal induction mechanism between the reversing guide unit and the adjacent middle guide unit is disconnected in induction, at the moment, the spraying device is controlled to perform reverse spraying operation, the reverse spraying operation is carried out in a process that the telescopic discharge pipe 6 extends to drive the spray head assembly to move towards the rear side of the coal mining machine hydraulic support 1, the telescopic discharge pipe 6 extends, the spray head assembly starts to spray a stopping agent towards a goaf right behind the pushed coal mining machine hydraulic support 1, after the spraying is finished, the telescopic discharge pipe 6 retracts, and the reverse spraying operation is finished;
step 403, before the hydraulic support 1 of the coal mining machine where the spraying device is located is pushed forwards, namely when the guiding unit where the spraying device is located is communicated with the signal sensing mechanism between the guiding units adjacent in the opposite direction in a sensing way, the spraying device is controlled to move in the opposite direction to the spraying point position of the next guiding unit;
404, after the hydraulic bracket 1 of the coal mining machine, which is positioned at the front of the hydraulic bracket 1 of the coal mining machine, is pushed forwards, the induction of the signal induction mechanism is disconnected, and at the moment, the spraying device is controlled to perform reverse spraying operation;
it should be noted that the spraying point positions on the guiding unit are the same in the forward movement and the backward movement, and the difference is that when the guiding unit moves forward, the spraying device sprays the stopping agent behind the hydraulic support of the current coal mining machine on the current guiding unit, and when the guiding unit moves backward. The spraying device sprays the stopping agent on the current guide unit behind the coal mining machine hydraulic support pushed by the side of the current coal mining machine hydraulic support, so that the operation logic is clear, and the use effect is good;
step 405, circularly executing the steps 403 to 404 until the first position sensing device 7 senses that the spraying device advances to the initial guiding unit, and executing a fifth step after the spraying device on the initial guiding unit performs the reverse spraying operation on the goaf right behind the hydraulic support 1 of the previous pushed coal mining machine;
step five, restoration of the spray head assembly and supplementary spraying of the stopping agent:
after the last reverse spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe 6 as a rotating shaft, so that the spray head assembly faces the initial guide unit;
then, carrying out supplementary spraying of a stopping agent on a goaf right behind the coal mining machine hydraulic support 1 where the initial guiding unit is located, wherein the supplementary spraying process is the same as the forward spraying process, and thus completing one stopping agent spraying cycle;
and step six, circulating the step two to the step five, and circularly spraying a stopping agent on the goaf until the coal mining operation is finished.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a collecting space area circulation flame retardant device for under mine which characterized in that: the device comprises a guide base and a spraying device, wherein the guide base is arranged on a base of a coal mining machine hydraulic support group and is distributed along the width direction of a goaf, the spraying device slides on the guide base in a reciprocating manner, the coal mining machine hydraulic support group comprises a plurality of coal mining machine hydraulic supports (1), the guide base comprises a plurality of guide units, the guide units and the coal mining machine hydraulic supports (1) are same in number and correspond to each other one by one, and the spraying device sprays a stopping agent to the goaf behind the coal mining machine hydraulic supports (1);
a signal sensing mechanism used for controlling the spraying device to work is arranged between every two adjacent guide units, and the signal sensing mechanism comprises an infrared signal transmitter (2) arranged at the end part of one guide unit and an infrared signal receiver (3) arranged at the end part of the other guide unit and matched with the infrared signal transmitter (2);
the sprinkler includes along removal base (4) that the guide unit removed, set up storage tank (5) on removal base (4), with storage tank (5) inside intercommunication and along flexible discharging pipe (6) of coal-winning machine hydraulic support (1) direction of advance, with flexible discharging pipe (6) rotate to be connected and be used for spraying the shower nozzle subassembly of stopping the agent to coal-winning machine hydraulic support (1) rear goaf and be used for control the shower nozzle subassembly uses flexible discharging pipe (6) central line as pivot pivoted rotation control mechanism, the angle between stopping the agent injection direction of shower nozzle subassembly and flexible discharging pipe (6) central line is 90.
2. The goaf circulating flame retardant device used under mine as claimed in claim 1, wherein: the laser alignment device comprises a guide base, wherein a first position sensing device (7) used for sensing the position of the spraying device is arranged on the guide unit at one end of the guide base, a second position sensing device (8) used for sensing the position of the spraying device is arranged on the guide unit at the other end of the guide base, and the first position sensing device (7) and the second position sensing device (8) are laser alignment devices.
3. The goaf circulating flame retardant device used under a mine as claimed in claim 1, wherein: the shower nozzle subassembly include with spray tube (9) that flexible discharging pipe (6) rotate to be connected, keep away from hollow reposition of redundant personnel seat (10) of flexible discharging pipe (6) one end intercommunication with spray tube (9) and with nozzle mount pad (11) of hollow reposition of redundant personnel seat (10) intercommunication and set up nozzle (12) on nozzle mount pad (11), be provided with two magnetic hose (13) between hollow reposition of redundant personnel seat (10) and nozzle mount pad (11), magnetic hose rotates with hollow reposition of redundant personnel seat (10) to be connected, magnetic hose (13) and nozzle mount pad (11) fixed connection, still be provided with on hollow reposition of redundant personnel seat (10) and be used for controlling magnetic hose (13) pivoted arc magnetic induction coil (14), arc magnetic induction coil (14) are worn to establish between two magnetic hose (13).
4. The goaf circulating flame retardant device used under mine as claimed in claim 3, wherein: the rotation control mechanism comprises a driving gear (15) arranged on the outer side of the extending end of the telescopic discharging pipe (6), a driving motor (21) for controlling the driving gear (15) to rotate, and a driven gear (16) fixedly sleeved on the spraying pipe (9) and in transmission connection with the driving gear (15), wherein the width of the driven gear (16) is larger than that of the driving gear (15).
5. The goaf circulating flame retardant device used under mine as claimed in claim 1, wherein: the guiding unit comprises a base (17) arranged on a base of the coal mining machine hydraulic support (1) and guide rails (18) embedded on the base (17), the upper surfaces of the guide rails (18) are flush, and the infrared signal transmitter (2) and the infrared signal receiver (3) are arranged on the guide rails (18).
6. The goaf circulating flame retardant device used under a mine as claimed in claim 1, wherein: the telescopic discharge pipe (6) is communicated with the storage tank (5) sequentially through a horizontal elbow mounting pipe (19) and a vertical elbow pipeline (20).
7. The goaf circulating flame retardant device used under the mine as claimed in claim 2, wherein: the spraying device further comprises a controller, the spraying device and the mobile base (4) are controlled by the controller, and the infrared signal receiver (3), the first position sensing device (7) and the second position sensing device (8) are all in wireless connection with the controller through a wireless communication module.
8. A method for performing goaf circulating flame retardant by using the goaf circulating flame retardant device of claim 2, which is characterized in that: the method comprises the following steps:
step one, initial positioning of a spraying device:
the guide unit where the first position sensing device (7) is located is used as an initial guide unit, the guide unit where the second position sensing device (8) is located is used as a reversing guide unit, the guide unit located between the initial guide unit and the reversing guide unit is used as a middle guide unit, a spraying starting line is marked on the initial guide unit, and the vertical projection of a laser line emitted by the first position sensing device (7) on the initial guide unit is superposed with the spraying starting line;
placing the spraying device on the initial guide unit, enabling the spray head assembly to face the initial guide unit, enabling the telescopic discharge pipe (6) to retract, enabling the movable base (4) to drive the spraying device to move until the first position sensing device (7) senses the spraying device and then stops moving, and waiting for the coal mining work to start;
step two, forward movement and spraying of the spraying device:
the forward moving direction of the spraying device is the moving direction of the spraying device from the initial guide unit to the reversing guide unit; the specific process comprises the following steps:
step 201, after the coal mining machine hydraulic support (1) where the initial guide unit is located pushes a coal mining machine forward, the signal induction mechanism between the initial guide unit and the adjacent middle guide unit is disconnected in induction, at the moment, the spraying device is controlled to perform forward spraying operation, the forward spraying operation is performed in a process that the telescopic discharge pipe (6) extends to drive the spray head assembly to move towards the rear side of the coal mining machine hydraulic support (1), the telescopic discharge pipe (6) extends, the spray head assembly starts to spray a stopping agent to a goaf right behind the currently pushed coal mining machine hydraulic support (1), after the spraying is finished, the telescopic discharge pipe (6) retracts, the forward spraying operation is finished, and the next forward spraying operation is waited;
202, after a hydraulic support (1) of the coal mining machine, where the middle guide unit adjacent to the initial guide unit is located, of the coal mining machine is pushed forward to the coal mining machine, the middle guide unit is communicated with the signal induction mechanism between the adjacent initial guide units in an induction mode, the movable base (4) drives the spraying device to move forward to a spraying point position on the current middle guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
203, after the next coal mining machine hydraulic support (1) is pushed forward to a coal mining machine, the guide unit on the current coal mining machine hydraulic support (1) is communicated with the signal induction mechanism between the previous middle guide unit in an induction manner, the movable base (4) drives the spraying device to move forward to a spraying point position on the current guide unit, the spraying device is controlled to execute the forward spraying operation, and then the next forward spraying operation is waited;
step 204, circularly executing step 203 until a second position sensing device (8) senses that the spraying device advances to the reversing guide unit, and executing step three after the forward spraying operation on the reversing guide unit is finished;
step three, reversing the spray head assembly:
after the last forward spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe (6) as a rotating shaft;
step four, reverse movement and spraying of the spraying device:
the reverse moving direction of the spraying device is the moving direction of the spraying device from the reversing guide unit to the initial guide unit; the specific process comprises the following steps:
step 401, when a hydraulic support (1) of the coal mining machine where the reversing guide unit is located forwards pushes the coal mining machine, namely when the reversing guide unit is communicated with the signal induction mechanism between the adjacent middle guide units in an induction mode, controlling the spraying device to move reversely to a spraying point position of the lateral middle guide unit;
402, when the coal mining machine hydraulic support (1) where the reversing guide unit is located pushes a coal mining machine forwards, the reversing guide unit is disconnected from the signal induction mechanism between the adjacent middle guide unit, the spraying device is controlled to perform reverse spraying operation at the moment, the reverse spraying operation is carried out in the process that the telescopic discharge pipe (6) extends to drive the spray head assembly to move towards the rear side of the coal mining machine hydraulic support (1), the telescopic discharge pipe (6) extends, the spray head assembly starts to spray a stopping agent to a goaf right behind the previously pushed coal mining machine hydraulic support (1), after the spraying is finished, the telescopic discharge pipe (6) retracts, and the reverse spraying operation is finished;
step 403, before the hydraulic support (1) of the coal mining machine where the spraying device is located is pushed forwards, namely when the guiding unit where the spraying device is located is communicated with the signal induction mechanism between the guiding units which are adjacent in the opposite direction in an induction mode, the spraying device is controlled to move in the opposite direction to the spraying point position of the next guiding unit;
404, after a previous coal mining machine hydraulic support (1) of the coal mining machine hydraulic support (1) where the spraying device is located is pushed forwards, the sensing of the signal sensing mechanism is disconnected, and at the moment, the spraying device is controlled to perform reverse spraying operation;
step 405, circularly executing the steps 403 to 404 until the first position sensing device (7) senses that the spraying device advances to the initial guiding unit, and executing a fifth step after the spraying device on the initial guiding unit performs the reverse spraying operation on the goaf right behind the hydraulic support (1) of the previous pushed coal mining machine;
step five, restoration of the spray head assembly and supplementary spraying of the stopping agent:
after the last reverse spraying operation is finished, controlling the rotation control mechanism to drive the spray head assembly to rotate 180 degrees by taking the central line of the telescopic discharge pipe (6) as a rotating shaft, so that the spray head assembly faces the initial guide unit;
then, carrying out supplementary spraying of a stopping agent on a goaf right behind the coal mining machine hydraulic support (1) where the initial guiding unit is located, wherein the supplementary spraying process is the same as the forward spraying process, and thus completing one stopping agent spraying cycle;
and step six, circulating the step two to the step five, and circularly spraying the stopping agent on the goaf until the coal mining operation is finished.
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| CN112963192B true CN112963192B (en) | 2023-03-14 |
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