AU2018431165B2 - Three-dimensional space dust control and removal method used for dust produced during bracket motion of fully mechanized mining face - Google Patents
Three-dimensional space dust control and removal method used for dust produced during bracket motion of fully mechanized mining face Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005065 mining Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims description 68
- 239000002245 particle Substances 0.000 claims description 46
- 239000003245 coal Substances 0.000 claims description 40
- 238000000889 atomisation Methods 0.000 claims description 32
- 230000009467 reduction Effects 0.000 claims description 13
- 238000009423 ventilation Methods 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000012806 monitoring device Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract 1
- 238000002955 isolation Methods 0.000 abstract 1
- 239000012141 concentrate Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/22—Equipment for preventing the formation of, or for removal of, dust
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/24—Remote control specially adapted for machines for slitting or completely freeing the mineral
-
- 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
-
- 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
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/04—Spraying barriers
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Spray Control Apparatus (AREA)
Abstract
A three-dimensional space dust control and removal method for dust produced during bracket motion of a fully mechanized mining face. Different dust-proof measures are taken for upper, middle and lower spaces of the fully mechanized mining face; an air curtain machine (3) or different kinds of nozzles are utilized to form a gas-water double-curtain closed space or a single fog-filed closed space; a sensor transmits a signal to a central processing system, thereby conducting fully-automatic spraying dust-reduction in the bracket moving process of column descending, bracket advancing, column ascending and the like, and high-concentration dust is concentrated in the closed space to be treated in a concentrated mode, or the high-concentration dust is blocked outside of the closed space. A wireless transmission system is employed using closed dust-isolation and a spraying dust-reduction mode. A remote control device is utilized to transmit a radio signal, and a signal processor receives the signal and transmits the signal to a controller.
Description
Technical Field
The present invention relates to a coal mine dust prevention and control method, in particular
to a spatial three-dimensional controlled dust removal method for dust produced by frame
movement on a fully mechanized mining face.
Background Art
Coal is the main energy source in China, accounting for about 70% of the total primary energy
consumption. At present, with the continuous improvement of the mechanization and automation
of coal mines, the amount of dust produced during the production on coal mining faces continues
to increase. When no dust control measure is taken, the dust concentration on a fully mechanized
mining face can reach 5000-8000mg/m 3, and the dust produced by frame movement can account
for more than 45% of the total dust, which not only causes pneumoconiosis, but also causes coal
dust and gas explosion accidents, thus posing a serious threat to mine safety production. However,
the "Coal Mine Safety Regulations" stipulates that the maximum total dust concentration is
4mg/m3 and the maximum respiratory dust concentration is 2.5mg/m3 .
The main dust prevention measures taken at the fully mechanized mining face include coal
seam water injection, dust exhaust by ventilation, dust suppression by spraying, wet dust capture,
personal protection, physical and chemical dust suppression and the like, but the fully mechanized
mining face is an open production space with a large working space and a high wind speed, the
dust produced by the action of a hydraulic support can spread to the entire working space within a
very short time with the airflow, the above-mentioned dust prevention measures can only reduce
the dust concentration on the fully mechanized mining face to a certain extent, but cannot control
the dust on the fully mechanized mining face effectively, and the dust pollution phenomenon is
still serious. Therefore, the prior art needs to be further improved and developed.
Summary of the Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides
a spatial three-dimensional controlled dust removal method for dust produced by frame movement
on a fully mechanized mining face, so as to improve the dust removal efficiency of the fully
mechanized mining face during frame movement.
In order to solve the above technical problems, the solution of the present invention includes:
A spatial three-dimensional controlled dust removal method for dust produced by frame
movement on a fully mechanized mining face includes the following steps:
disposing an air curtain machine along the width direction of the top of each hydraulic support,
wherein the air flow is sprayed to form an air curtain, the air flow blown by the air curtain machine
has strong air tightness, and there is no obstruction between the air flow, so that the dust can be
effectively controlled in the internal space of the hydraulic support, detecting the air speed through
an air speed sensor, transmitting a signal to a variable frequency speed control device, controlling
the relationship among the rotating speed, the frequency and the air volume of the air curtain
machine, and then controlling the air volume of the air flow; disposing a position signal transmitter
on the machine body of a coal cutter, disposing a coal cutter position signal receiver and an upright
post lifting sensor on the hydraulic support, determining the opening of the air curtain and nozzles
through the position of the coal cutter, and controlling the air volume and the spray volume by a
central control system; judging a process of column lowering-moving forward-column lifting of
the hydraulic support according to the change of pressure in the oil cavity in an upright post; and
when a central controller receives a coal cutter position signal and monitors a frame movement
action of the support, synchronously starting the air curtain machines of 5-10 hydraulic supports
on the upwind side and all hydraulic supports on the downwind side, so that the air flow forms the
air curtain via the air curtain machines to block the dust between a coal wall and a hydraulic support
push frame;
at the same time, opening all nozzles in the upper, middle and lower spaces of 3-5 hydraulic
supports on the upwind side and 5-10 hydraulic supports on the downwind side of frame movement
through an infrared photoelectric switch, and disposing a single-water combined sprayer in the
upper space along the length direction of the hydraulic support to perform spray dust reduction; in
the middle space, disposing single-water and air-water nozzle groups forming included angles of
°,45°and 6 0 °above the hydraulic support push frame diagonally upward, and controlling the same by using the infrared photoelectric switch; and in the lower space, disposing single-water and air-water nozzle groups forming included angles of 30°,45°and 60°at the junction of a scraper conveyor and the hydraulic support push frame diagonally upward; and disposing laser particle size dust monitoring devices at corresponding positions of the hydraulic supports, selectively opening different types of nozzles by monitoring the dust of different particle sizes, enabling the angles of all the nozzles in the upper, middle and lower spaces to be converted between10°by setting a gear engagement angle, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of a spray pump plunger, so that the dust reduction efficiency of the dust produced in the cutting and frame movement process of the coal cutter can reach more than 95%.
In the spatial three-dimensional controlled dust removal method, wherein the above steps further include: disposing a first nozzle group along the length direction of the middle of a forepoling bar 1 of each hydraulic support, and using the single-water combined sprayers, disposing 6 groups of single-water combined sprayers on the forepoling bar of each support, respectively disposing the single-water combined sprayers at the top, the end part and the middle of the forepoling bar, disposing two groups at each position, respectively disposing two groups parallel to each other at positions occupying 1/8 of the length of the entire forepoling bar along the length direction of the top and the end part of the forepoling bar, and disposing two groups of sprayers vertical to each other at positions occupying 1/3 of the length of the entire forepoling bar along the length direction of the middle of the forepoling bar and at positions occupying 1/2 of the length of the entire forepoling bar along the width direction, wherein the spray direction is vertical to the bottom plate; and disposing a first forepoling bar air curtain machine at the rear edge of the forepoling bar, wherein the air flow ejected by the first forepoling bar air curtain machine is parallel to the direction of the coal wall, the single-water combined sprayer uses nozzles of two kinds of performance to spray, so that the cover area is large, the effective spray distance is long, and dust of different particle sizes is effectively captured; and disposing a ventilation pipeline and a water supply pipeline at the upper part of the outer side edge of the hydraulic support push frame along the width direction, fixing the same on the plate wall, disposing air-water nozzles and single-water nozzles along the width direction of the push frame to serve as a second nozzle group, and controlling the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are respectively 30, 45 and 60° diagonally upward; and finally, disposing a third nozzle group in the gap between the junctions of the scraper conveyor and the hydraulic support push frame, meanwhile fixing an air pipe and a water pipe by using the plate wall, using the single-water nozzles and the air-water nozzles, and controlling the switches of the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are 30°, 450 and 60° diagonally upward.
In the spatial three-dimensional controlled dust removal method, wherein the above steps
further include:
disposing a second forepoling bar air curtain machine at the front edge of the forepoling bar
of each hydraulic support along the width direction, wherein the air flow forms an air curtain via
the second forepoling bar air curtain machine to prevent the coal dust from entering the upper,
middle and lower internal spaces of the hydraulic support; at the same time, detecting the
magnitude of the air speed through the air speed sensor, transmitting a signal to a signal processor
for processing, and transmitting a signal to the variable frequency speed control device to change
the relationship among the rotating speed, the frequency and the air volume, wherein when the
variable frequency speed control devices of the air curtain machine, the first forepoling bar air
curtain machine and the second forepoling bar air curtain machine receive the signals, because the
rotating speed of a variable frequency motor n=60*frequency/the number of electrode couples,
and because the flow rate of the air flow is in direct proportion to the rotating speed, that is, the
flow rate of the air flow Qi/Q2=ni/n2, so a dust removal fan can adjust the air volume by adjusting
the rotating speed, wherein n represents the rotating speed of the variable frequency motor, and Q
represents the flow rate of the air flow.
In the spatial three-dimensional controlled dust removal method, wherein the above steps
further include:
disposing 6 single-water solid conical nozzles on the edge of the above-mentioned single
water combined sprayer, which have a small atomization particle size, a large atomization angle
and a large range, thus can eliminate dust of large particle sizes, and disposing 3 single-water
square nozzles at the central position of the above-mentioned single-water combined sprayer, which have a large atomization particle size, a small atomization angle and a large range for mainly eliminating dust of small particle sizes.
In the spatial three-dimensional controlled dust removal method, wherein the above steps
further include:
disposing a ventilation pipeline and a water supply pipeline above the outer side of the
hydraulic support push frame, fixing the same on the plate wall, disposing the second nozzle group
along the width direction of the push frame, disposing air-water nozzles and single-water nozzles
in a ratio of 1:2, that is,1 single-water nozzle is adjacent to 2 air-water nozzles; using the infrared
photoelectric switch for control, wherein different spray angles have different ranges of
atomization spaces to achieve an extensive atomization space, monitoring the particle size
distribution of the dust by the laser particle size dust monitoring device, transmitting signals to a
stepping motor controller and a plunger pump by the signal processor through an interface,
controlling a motor shaft gear to mesh with a gear below the nozzle by a stepping motor,
controlling the reciprocating frequency by the plunger pump, thereby controlling the rotation of
the nozzle and adjusting the spray pressure; and setting a gear engagement angle to enable the
angles of the nozzles to be converted between+100, and causing the spray pressure to fluctuate
within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger,
so as to process the coal dust of different particle sizes dispersing into the middle range.
In the spatial three-dimensional controlled dust removal method, wherein the above steps
further include:
mounting a water supply pipeline and a ventilation pipeline in the gap between the junctions
of the hydraulic support push frame and the scraper conveyor, wherein the third nozzle group
includes air-water nozzles and single-water nozzles, the air-water nozzles and the single-water
nozzles are disposed in a ratio of 2:1, that is, 2 single-water nozzles are adjacent to 1 air-water
nozzle, setting a gear engagement angle to enable the angles of the nozzles to be converted
between 10°, and causing the spray pressure to fluctuate within the range of 53MPa by changing
the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different
particle sizes dispersing into the middle range and to perform controlled dust removal processing
of the lower space.
In the spatial three-dimensional controlled dust removal method, wherein the above steps further include: employing a single-water mixed solid conical nozzle on the outer edge of the first nozzle group, and employing a single-water mixed direct injection nozzle as the internal nozzle; and employing internal mixing air-water nozzles as the air-water nozzles of the second nozzle group and the third nozzle group, employing a mixed centrifugal nozzle as the single-water nozzle of the second nozzle group, and employing a mixed direct injection nozzle as the single-water nozzle of the third nozzle group. According to the spatial three-dimensional controlled dust removal method for dust produced by frame movement on the fully mechanized mining face provided by the present invention, different spray dust reduction measures are respectively carried out on the upper, middle and lower spaces of the fully mechanized mining face, an air-water double-curtain closed space or a single spray field closed space is formed by using nozzles of different types to concentrate the high concentration dust in the closed space for centralized treatment, thereby avoiding the dust from escaping to other working areas or blocking the high-concentration dust at the outside of the closed space, so as to avoid the dust polluting the internal working environment of the closed space; and the manners of spray dust reduction and closed dust separation are adopted, a wireless transmission system is employed, a radio signal is transmitted by a remote control device, the signal processor receives the signal and transmits the same to the controller, so that the controller can adjust the spray height and the water pressure of the nozzle, in this way, the dust reduction efficiency in the process of coal mining and frame movement is increased by more than 95%, and the dust concentration on the fully mechanized mining face is greatly reduced, which not only avoids coal dust explosion accidents, but also greatly improves the working environment of workers.
Brief Description of the Drawings Fig. 1 is a schematic layout diagram of a controlled dust removal method of an upper space in the present invention; Fig. 2 is a schematic layout diagram of a controlled dust removal method of a middle space in the present invention; Fig. 3 is a schematic layout diagram of a controlled dust removal method of a lower space in the present invention;
Fig. 4 is a schematic layout diagram of a spatial three-dimensional controlled dust removal
method of a fully mechanized mining face in the present invention;
Fig. 5 is a schematic flow diagram of the spatial three-dimensional controlled dust removal
method in the present invention;
Fig. 6 is a front view of a spatial three-dimensional controlled dust removal process of the
fully mechanized mining face in the present invention;
Fig. 7 is a front view of a single-water combined sprayer in the present invention;
wherein, 1-forepoling bar; 2-single-water combined sprayer; 3-air curtain machine; 4-top
beam; 5-air speed sensor; 6-laser particle size dust monitoring device; 7-coal cutter position
receiver; 8-upright post; 9-shield beam face guard; 10-connecting rod; 11-second nozzle group;
12-hydraulic support push frame; 13-third nozzle group; 14-hydraulic jack; 15-stepping motor;
16-scraper conveyor; 17-single-water solid conical nozzle; 18-single-water square nozzle; 19-air
water nozzle.
Detailed Description of the Embodiments
The present invention provides a spatial three-dimensional controlled dust removal method
for dust produced by frame movement on a fully mechanized mining face. In order to make the
objectives, technical solutions and effects of the present invention clearer and more extract, the
present invention will be described in further detail below. It should be understood that the specific
embodiments described here are only used for explaining the present invention, rather than limiting
the present invention.
The present invention provides a spatial three-dimensional controlled dust removal method
for dust produced by frame movement on a fully mechanized mining face, as shown in Fig. 5,
including the following steps:
disposing an air curtain machine 3 along the width direction of the top of each hydraulic
support, wherein the air flow is sprayed to form an air curtain, the air flow blown by the air curtain
machine has strong air tightness, and there is no obstruction between the air flow, so that the dust
can be effectively controlled in the internal space of the hydraulic support, detecting the air speed
through an air speed sensor, transmitting a signal to a variable frequency speed control device,
controlling the relationship among the rotating speed, the frequency and the air volume of the air curtain machine 3, and then controlling the air volume of the air flow; disposing a position signal transmitter on the machine body of a coal cutter, disposing a coal cutter position signal receiver 7 and an upright post lifting sensor on the hydraulic support, determining the opening of the air curtain and nozzles through the position of the coal cutter, and controlling the air volume and the spray volume by a central control system; judging a process of column lowering-moving forward column lifting of the hydraulic support according to the change of pressure in the oil cavity in an upright post 8; and when a central controller receives a coal cutter position signal and monitors a frame movement action of the support, synchronously starting the air curtain machines 3 of 5-10 hydraulic supports on the upwind side and all hydraulic supports on the downwind side, so that the air flow forms the air curtain via the air curtain machines 3 to block the dust between a coal wall and a hydraulic support push frame 12; at the same time, opening all nozzles in the upper, middle and lower spaces of 3-5 hydraulic supports on the upwind side and 5-10 hydraulic supports on the downwind side of frame movement through an infrared photoelectric switch, and disposing a single-water combined sprayer 2 in the upper space along the length direction of the hydraulic support to perform spray dust reduction; in the middle space, disposing single-water and air-water nozzle groups forming included angles of °,45°and 60°above the hydraulic support push frame 12 diagonally upward, and controlling the same by using the infrared photoelectric switch; and in the lower space, disposing single-water and air-water nozzle groups forming included angles of 30°,45°and 60°at the junction of a scraper conveyor 16 and the hydraulic support push frame 12 diagonally upward; and disposing laser particle size dust monitoring devices 6 at corresponding positions of the hydraulic supports to sense the particle size distribution of the dust, enabling the angles of all the nozzles in the upper, middle and lower spaces to be converted between10°by setting a gear engagement angle, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of a spray pump plunger, so that the dust reduction efficiency of the dust produced in the cutting and frame movement process of the coal cutter can reach more than 95%.
Further, the above steps further include: disposing a first nozzle group along the length direction of the middle of a forepoling bar 1 of each hydraulic support, and using the single-water combined sprayers, disposing 6 groups of single-water combined sprayers on the forepoling bar of each support, respectively disposing the single-water combined sprayers at the top, the end part and the middle of the forepoling bar 1, disposing two groups at each position, respectively disposing two groups parallel to each other at positions occupying 1/8 of the length of the entire forepoling bar 1 along the length direction of the top and the end part of the forepoling bar 1, and disposing two groups of sprayers vertical to each other at positions occupying 1/3 of the length of the entire forepoling bar 1 along the length direction of the middle of the forepoling bar and at positions occupying 1/2 of the length of the entire forepoling bar 1 along the width direction, wherein the spray direction is vertical to the bottom plate; and disposing a first forepoling bar air curtain machine at the rear edge of the forepoling bar 1, wherein the air flow ejected by the first forepoling bar air curtain machine is parallel to the direction of the coal wall, the single-water combined sprayer 2 uses nozzles of two kinds of performance to spray, so that the cover area is large, the effective spray distance is long, and dust of different particle sizes is effectively captured; and disposing a ventilation pipeline and a water supply pipeline at the upper part of the outer side edge of the hydraulic support push frame 12 along the width direction, fixing the same on the plate wall, disposing air-water nozzles and single-water nozzles along the width direction of the push frame to serve as a second nozzle group 11, and controlling the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are respectively 30, 45 and 60° diagonally upward; and finally, disposing a third nozzle group 13 in the gap between the junctions of the scraper conveyor 16 and the hydraulic support push frame 12, meanwhile fixing an air pipe and a water pipe by using the plate wall, using the single-water nozzles and the air-water nozzles, and controlling the switches of the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are 30°, 45 and 60° diagonally upward, and an air-water double-curtain closed space is formed to concentrate high-concentration dust in the closed space for centralized treatment. Most preferably in the present invention, the above steps further include: disposing a second forepoling bar air curtain machine at the front edge of the forepoling bar 1 of each hydraulic support along the width direction, wherein the air flow forms an air curtain via the second forepoling bar air curtain machine to prevent the coal dust from entering the upper, middle and lower internal spaces of the hydraulic support; at the same time, detecting the magnitude of the air speed through the air speed sensor, transmitting a signal to a signal processor for processing, and transmitting a signal to the variable frequency speed control device to change the relationship among the rotating speed, the frequency and the air volume, wherein when the variable frequency speed control devices of the air curtain machine 3, the first forepoling bar air curtain machine and the second forepoling bar air curtain machine receive the signals, because the rotating speed of a variable frequency motor n=60*frequency/the number of electrode couples, and because the flow rate of the air flow is in direct proportion to the rotating speed, that is, the flow rate of the air flow Qi/Q2=ni/n2, so a dust removal fan can adjust the air volume by adjusting the rotating speed, wherein n represents the rotating speed of the variable frequency motor, and Q represents the flow rate of the air flow.
Further, as shown in Fig. 7, the above steps further include:
disposing 6 single-water solid conical nozzles 17 on the edge of the above-mentioned single
water combined sprayer 2, which have a small atomization particle size, a large atomization angle
and a large range, thus can eliminate dust of large particle sizes, and disposing 3 single-water
square nozzles 18 at the central position of the above-mentioned single-water combined sprayer,
which have a large atomization particle size, a small atomization angle and a large range for mainly
eliminating dust of small particle sizes, wherein a single spray field closed space is formed to
concentrate the high-concentration dust in the closed space for centralized treatment.
Further, the above steps further include:
disposing a ventilation pipeline and a water supply pipeline above the outer side of the
hydraulic support push frame 12, fixing the same on the plate wall, disposing the second nozzle
group 11 along the width direction of the hydraulic support push frame 12, disposing air-water
nozzles and single-water nozzles in a ratio of 1:2, that is, 1 single-water nozzle is adjacent to 2 air
water nozzles; using the infrared photoelectric switch for control, wherein different spray angles
have different ranges of atomization spaces to achieve an extensive atomization space, monitoring
the particle size distribution of the dust by the laser particle size dust monitoring device 6,
transmitting signals to a stepping motor controller and a plunger pump by the signal processor
through an interface, controlling a motor shaft gear to mesh with a gear below the nozzle by a
stepping motor 15, controlling the reciprocating frequency by the plunger pump, thereby
controlling the rotation of the nozzle and adjusting the spray pressure; and setting a gear engagement angle to enable the angles of the nozzles to be converted between10°, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different particle sizes dispersing into the middle range. Moreover, the above steps further include: mounting a water supply pipeline and a ventilation pipeline in the gap between the junctions of the hydraulic support push frame 12 and the scraper conveyor 16, wherein the third nozzle group 13 includes air-water nozzles and single-water nozzles, the air-water nozzles and the single-water nozzles are disposed in a ratio of 2:1, that is, 2 single-water nozzles are adjacent to 1 air-water nozzle, setting a gear engagement angle to enable the angles of the nozzles to be converted between 10°, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different particle sizes dispersing into the middle range and to perform controlled dust removal processing of the lower space. Preferably, in the present invention, the above steps further include: employing a single-water mixed solid conical nozzle on the outer edge of the first nozzle group, employing a single-water mixed direct injection nozzle as the internal nozzle, which has a small atomization angle and a large range, and employing a single-water mixed centrifugal nozzle as an edge nozzle, which has a greater atomization angle; and employing internal mixing air-water nozzles as the air-water nozzles of the second nozzle group 11 and the third nozzle group 13, employing a mixed centrifugal nozzle as the single-water nozzle of the second nozzle group 11, which has a moderate atomization angle and a moderate range, and employing a mixed direct injection nozzle as the single-water nozzle of the third nozzle group 13, which has a smaller atomization angle and a greater range. By means of the combination of different nozzles, an air water double-curtain closed space or a single spray field closed space is formed by using nozzles of different types to concentrate the high-concentration dust in the closed space for centralized treatment. In order to further describe the present invention, more detailed embodiments are listed below for description. As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 6, the method includes the following steps: in the upper space, disposing the air curtain machine 3 along the width direction of the top of the hydraulic support, wherein the air flow blown by the air curtain machine has strong air tightness, and there is no obstruction between the air flow, so that the dust can be effectively controlled in the internal space of the hydraulic support, isolating the hydraulic support from a front space, detecting the air speed through the air speed sensor, performing adjustment according to the size of the actually detected air speed, transmitting a signal to the variable frequency speed control device, and controlling the air volume of the air flow by controlling the relationship among the rotating speed, the frequency and the air volume; disposing the position signal transmitter on the machine body of the coal cutter, disposing the coal cutter position signal receiver 7 and the upright post lifting sensor on the hydraulic support, and judging the process of column lowering-moving forward-column lifting of the hydraulic support according to the change of pressure in the oil cavity in the upright post; and when the central controller receives the coal cutter position signal and monitors the frame movement action of the support, automatically starting the air curtain machines 3 of 5-10 supports on the upwind side and all supports on the downwind side, so that the air flow forms the air curtain via the air curtain machines 3 to block the dust between the coal wall and the hydraulic support push frame 12; at the same time, opening all nozzles of 3-5 supports on the upwind side and the 5-10 supports on the downwind side of frame movement through the infrared photoelectric switch, and disposing the single-water combined sprayer 2 at the upper part along the length direction of the hydraulic support to perform spray dust reduction; in the middle space, disposing single-water and air-water nozzle groups 11 forming included angles of 30°,45°and 60°above the hydraulic support push frame 12 diagonally upward, and controlling the same by using the infrared photoelectric switch; and in the lower space, disposing the third group nozzle 13 forming included angles of 30°,45°and
°at the junction of the scraper conveyor 16 and the hydraulic support push frame 12 diagonally
upward, wherein the third group nozzle 13 includes single-water nozzles and air-water nozzles,
disposing laser particle size dust monitoring devices 6 to monitor the particle size distribution of
the dust, adjusting the angles of the nozzles and the water pressure according to the particle size
distribution of the dust by using a manual control system or an automatic control system,
controlling the switches of the nozzles by using an infrared photoelectric device, enabling the angles of the nozzles to be converted betweenl10°by setting the gear engagement angle, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger, so that the dust reduction efficiency of the dust produced in the cutting and frame movement process of the coal cutter can reach more than 95%.
More specific details are as follows: As shown in Fig. 1, two different types of nozzles are disposed at the central position of the forepoling bar 1 of each hydraulic support in the fully mechanized mining face, the air curtain machine 3 is disposed along the width direction, the air flow blown by the air curtain machine 3 has strong air tightness, and there is no obstruction between the air flow, so that the dust can be effectively controlled in the internal space of the hydraulic support, the air speed is detected through the air speed sensor 5, adjustment is performed according to the size of the actually detected air speed, the signal is transmitted to the variable frequency speed control device, and the air volume of the air flow is controlled by controlling the relationship among the rotating speed, the frequency and the air volume; the position signal transmitter is disposed on the machine body of the coal cutter, the coal cutter position signal receiver 7 and the upright post lifting sensor are disposed on the hydraulic support, and the process of column lowering-moving forward-column lifting is performed according to the change of pressure in the oil cavity in the upright post; during the cutting of the coal cutter, the process of column lowering-moving forward-column lifting is judged according to the change of pressure in the oil cavity in the upright post; when the central controller receives the coal cutter position signal and monitors the frame movement action of the support, the air curtain machines 3 of 5-10 supports on the upwind side and all supports on the downwind side are automatically started, so that the air flow forms the air curtain via the air curtain machines 3 to block the dust between the coal wall and the hydraulic support push frame 12, at the same time, all nozzles in the upper, middle and lower spaces of 3-5 supports on the upwind side and the 5-10 supports on the downwind side of frame movement are opened through the infrared photoelectric switch, and the spray direction is vertical to the bottom plate. Firstly, the single-water combined sprayer 2 is disposed along the length direction of the hydraulic support to perform spray dust reduction, 6 groups of combined sprayers are disposed on the forepoling bar of each support, and are respectively disposed at the top, the end part and the middle of the forepoling bar 1, two groups are disposed at each position, two groups parallel to each other are respectively disposed at positions occupying 1/8 of the length of the entire forepoling bar 1 along the length and width direction of the top and the end part of the forepoling bar 1, two groups of sprayers vertical to each other are disposed at positions occupying 1/3 of the length of the entire forepoling bar 1 along the length direction of the middle of the forepoling bar
1 and at positions occupying 1/2 of the length of the entire forepoling bar 1 along the width
direction, the spray direction is vertical to the bottom plate, the single-water combined sprayer 2
uses nozzles of two kinds of performance to spray, so that the cover area is large, the effective
spray distance is long, and dust of different particle sizes is effectively captured, as shown in Fig.
7, 6 single-water solid conical nozzles 17 are disposed on the edge of the single-water combined
sprayer 2, and have a small atomization particle size, a large atomization angle and a large range,
thus can eliminate dust of large particle sizes, 3 different single-water square nozzles 18 are
disposed at the central position of the single-water combined sprayer 2, and have a large
atomization particle size, a small atomization angle and a large range for mainly eliminating dust
of small particle sizes, controlled dust removal is performed on the dust in the upper space of the
hydraulic support through the device, and an effect of high dust reduction efficiency is realized.
As shown in Fig. 2 and Fig. 6, a ventilation pipeline and a water supply pipeline are disposed
above the outer side of the hydraulic support push frame 12 and are fixed by the plate wall, air
water nozzles 19 and single-water nozzles 17 are disposed along the width direction of the push
frame, and the single-water nozzles and the air-water nozzles are disposed in a ratio of 1:2, that is,
1 single-water nozzle 17 is adjacent to 2 air-water nozzles 19; the infrared photoelectric switch is
employed for control, since different spray angles have different ranges of atomization spaces, an
extensive atomization space is guaranteed, the automatic control system can be adopted in the
design, the laser particle size dust monitoring device 6 monitors the particle size distribution of
the dust, a signal processor transmits signals to a stepping motor controller and a plunger pump
through an interface, a stepping motor 15 controls a motor shaft gear to mesh with a gear below
the nozzle, and the plunger pump controls the reciprocating frequency, thereby controlling the
rotation of the nozzle and adjusting the spray pressure; and in addition, the manual control system
can also be selected, manual control is carried out by the remote control device or an artificial
intelligence interface, the stepping motor 15 and the plunger pump receives the signal, a gear
engagement angle is set to enable the angles of the nozzles to be converted between10°, and the spray pressure fluctuates within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different particle sizes dispersing into the middle range.
Further, as shown in Fig. 3, a water supply pipeline and a ventilation pipeline are mounted in
the gap between the junctions of the hydraulic support push frame 12 and the scraper conveyor 16,
and are fixed by using the plate wall at the same time, since the particle sizes of the dust are uneven,
single-water solid conical nozzles and air-water nozzles are installed above the pipelines, the ratio
of the two types of nozzles is 2:1, that is, 2 single-water nozzles are adjacent to 1 air-water nozzle,
meanwhile, the manual or automatic control system is adopted, the switches of the nozzles are
controlled by using the infrared photoelectric device, so that the spray direction freely rotates at
°, 45°and 60+10°diagonally upward to perform controlled dust removal treatment on the lower
space.
Furthermore, as shown in Fig. 4, firstly, the air curtain machine 3 is disposed at the rear edge
of the forepoling bar 1 of each hydraulic support along the width direction, the single-water
combined sprayer 2 is disposed at the central position of the forepoling bar 1 of each hydraulic
support along the length direction, all nozzles are single-water nozzles, and the spray direction is
vertical to the bottom plate; secondly, the second nozzle group 11 is disposed at the upper part of
the outer side edge of the hydraulic support push frame 12 along the length direction, and includes
two types of nozzles, that is, air-water nozzles and single-water nozzles, and the spray directions
are diagonally upward 30°, 45°and 60°; and finally, the third nozzle group 13 is disposed in the
gap between the junctions of the scraper conveyor 16 and the hydraulic support push frame 12, the
third nozzle group 13 uses two types of nozzles, that is, air-water nozzles and single-water nozzles,
and the spray directions are diagonally upward 30°, 45°and 60°.
The single-water combined sprayer 2 adopts a single-water mixed solid conical nozzle, the
internal nozzle is a single-water mixed direct injection nozzle, which has a small atomization angle
and a large range, and the edge nozzle is a single-water mixed centrifugal nozzle, which has a
greater range and a greater atomization angle; the air-water nozzles of the second nozzle group 11
and the third nozzle group 13 adopt internal mixing air-water nozzles, the single-water nozzle of
the second nozzle group 11 adopts a mixed centrifugal nozzle, which has a moderate atomization
angle and a moderate range, and the single-water nozzle of the third nozzle group 13 adopts a mixed direct injection nozzle, which has a smaller atomization angle and a greater range. By means of the combination of different nozzles, an air-water double-curtain closed space or a single spray field closed space is formed by using nozzles of different types to concentrate the high concentration dust in the closed space for centralized treatment. Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that all equivalent substitutions and obvious deformation forms made by any skilled in the art who is familiar with this art under the teaching of the specification shall all fall within the essential scope of the specification and should be protected by the present invention.
Claims (7)
1. A spatial three-dimensional controlled dust removal method for dust produced by frame
movement on a fully mechanized mining face, comprising the following steps:
disposing an air curtain machine along the width direction of the top of each hydraulic support,
wherein the air flow is sprayed to form an air curtain, the air flow blown by the air curtain machine
has strong air tightness, and there is no obstruction between the air flow, so that the dust can be
effectively controlled in the internal space of the hydraulic support, detecting the air speed through
an air speed sensor, transmitting a signal to a variable frequency speed control device, controlling
the relationship among the rotating speed, the frequency and the air volume of the air curtain
machine, and then controlling the air volume of the air flow; disposing a position signal transmitter
on the machine body of a coal cutter, disposing a coal cutter position signal receiver and an upright
post lifting sensor on the hydraulic support, determining the opening of the air curtain and nozzles
through the position of the coal cutter, and controlling the air volume and the spray volume by a
central control system; judging a process of column lowering-moving forward-column lifting of
the hydraulic support according to the change of pressure in the oil cavity in an upright post; and
when a central controller receives a coal cutter position signal and monitors a frame movement
action of the support, synchronously starting the air curtain machines of 5-10 hydraulic supports
on the upwind side and all hydraulic supports on the downwind side, so that the air flow forms the
air curtain via the air curtain machines to block the dust between a coal wall and a hydraulic support
push frame;
at the same time, opening all nozzles in the upper, middle and lower spaces of 3-5 hydraulic
supports on the upwind side and 5-10 hydraulic supports on the downwind side of frame movement
through an infrared photoelectric switch, and disposing a single-water combined sprayer in the
upper space along the length direction of the hydraulic support to perform spray dust reduction; in
the middle space, disposing single-water and air-water nozzle groups forming included angles of
°,45°and 60°above the hydraulic support push frame diagonally upward, and controlling the
same by using the infrared photoelectric switch; and in the lower space, disposing single-water
and air-water nozzle groups forming included angles of 30°,45°and 60°at the junction of a scraper
conveyor and the hydraulic support push frame diagonally upward; and
disposing laser particle size dust monitoring devices at corresponding positions of the hydraulic supports, selectively opening different types of nozzles by monitoring the dust of different particle sizes, enabling the angles of all the nozzles in the upper, middle and lower spaces to be converted between10°by setting a gear engagement angle, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of a spray pump plunger, so that the dust reduction efficiency of the dust produced in the cutting and frame movement process of the coal cutter can reach more than 95%.
2. The spatial three-dimensional controlled dust removal method according to claim 1, wherein the above steps further comprise: disposing a first nozzle group along the length direction of the middle of a forepoling bar 1 of each hydraulic support, and using the single-water combined sprayers, disposing 6 groups of single-water combined sprayers on the forepoling bar of each support, respectively disposing the single-water combined sprayers at the top, the end part and the middle of the forepoling bar, disposing two groups at each position, respectively disposing two groups parallel to each other at positions occupying 1/8 of the length of the entire forepoling bar along the length direction of the top and the end part of the forepoling bar, and disposing two groups of sprayers vertical to each other at positions occupying 1/3 of the length of the entire forepoling bar along the length direction of the middle of the forepoling bar and at positions occupying 1/2 of the length of the entire forepoling bar along the width direction, wherein the spray direction is vertical to the bottom plate; and disposing a first forepoling bar air curtain machine at the rear edge of the forepoling bar, wherein the air flow ejected by the first forepoling bar air curtain machine is parallel to the direction of the coal wall, the single-water combined sprayer uses nozzles of two kinds of performance to spray, so that the cover area is large, the effective spray distance is long, and dust of different particle sizes is effectively captured; and disposing a ventilation pipeline and a water supply pipeline at the upper part of the outer side edge of the hydraulic support push frame along the width direction, fixing the same on the plate wall, disposing air-water nozzles and single-water nozzles along the width direction of the push frame to serve as a second nozzle group, and controlling the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are respectively 30, 45 and 60°
diagonally upward; and finally, disposing a third nozzle group in the gap between the junctions of the scraper conveyor and the hydraulic support push frame, meanwhile fixing an air pipe and a water pipe by using the plate wall, using the single-water nozzles and the air-water nozzles, and controlling the switches of the nozzles by using the infrared photoelectric switch, wherein the spray directions thereof are 300, 450 and 60° diagonally upward.
3. The spatial three-dimensional controlled dust removal method according to claim 2, wherein the above steps further comprise: disposing a second forepoling bar air curtain machine at the front edge of the forepoling bar of each hydraulic support along the width direction, wherein the air flow forms an air curtain via the second forepoling bar air curtain machine to prevent the coal dust from entering the upper, middle and lower internal spaces of the hydraulic support; at the same time, detecting the magnitude of the air speed through the air speed sensor, transmitting a signal to a signal processor for processing, and transmitting a signal to the variable frequency speed control device to change the relationship among the rotating speed, the frequency and the air volume, wherein when the variable frequency speed control devices of the air curtain machine, the first forepoling bar air curtain machine and the second forepoling bar air curtain machine receive the signals, because the rotating speed of a variable frequency motor n=60*frequency/the number of electrode couples, and because the flow rate of the air flow is in direct proportion to the rotating speed, that is, the flow rate of the air flow Qi/Q2=ni/n2, so a dust removal fan can adjust the air volume by adjusting
the rotating speed, wherein n represents the rotating speed of the variable frequency motor, and Q represents the flow rate of the air flow.
4. The spatial three-dimensional controlled dust removal method according to claim 2, wherein the above steps further comprise: disposing 6 single-water solid conical nozzles on the edge of the above-mentioned single water combined sprayer, which have a small atomization particle size, a large atomization angle and a large range, thus can eliminate dust of large particle sizes, and disposing 3 single-water square nozzles at the central position of the above-mentioned single-water combined sprayer, which have a large atomization particle size, a small atomization angle and a large range for mainly eliminating dust of small particle sizes.
5. The spatial three-dimensional controlled dust removal method according to claim 2, wherein the above steps further comprise: disposing a ventilation pipeline and a water supply pipeline above the outer side of the hydraulic support push frame, fixing the same on the plate wall, disposing the second nozzle group along the width direction of the push frame, disposing air-water nozzles and single-water nozzles in a ratio of 1:2, that is,1 single-water nozzle is adjacent to 2 air-water nozzles; using the infrared photoelectric switch for control, wherein different spray angles have different ranges of atomization spaces to achieve an extensive atomization space, monitoring the particle size distribution of the dust by the laser particle size dust monitoring device, transmitting signals to a stepping motor controller and a plunger pump by the signal processor through an interface, controlling a motor shaft gear to mesh with a gear below the nozzle by a stepping motor, controlling the reciprocating frequency by the plunger pump, thereby controlling the rotation of the nozzle and adjusting the spray pressure; and setting a gear engagement angle to enable the angles of the nozzles to be converted between10°, and causing the spray pressure to fluctuate within the range of 53MPa by changing the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different particle sizes dispersing into the middle range.
6. The spatial three-dimensional controlled dust removal method according to claim 2,
wherein the above steps further comprise:
mounting a water supply pipeline and a ventilation pipeline in the gap between the junctions
of the hydraulic support push frame and the scraper conveyor, wherein the third nozzle group
comprises air-water nozzles and single-water nozzles, the air-water nozzles and the single-water
nozzles are disposed in a ratio of 2:1, that is, 2 single-water nozzles are adjacent to 1 air-water
nozzle, setting a gear engagement angle to enable the angles of the nozzles to be converted
between 10°, and causing the spray pressure to fluctuate within the range of 53MPa by changing
the reciprocating frequency of the spray pump plunger, so as to process the coal dust of different
particle sizes dispersing into the middle range and to perform controlled dust removal processing
of the lower space.
7. The spatial three-dimensional controlled dust removal method according to claim 2,
wherein the above steps further comprise:
employing a single-water mixed solid conical nozzle on the outer edge of the first nozzle
group, and employing a single-water mixed direct injection nozzle as the internal nozzle; and
employing internal mixing air-water nozzles as the air-water nozzles of the second nozzle group
and the third nozzle group, employing a mixed centrifugal nozzle as the single-water nozzle of the second nozzle group, and employing a mixed direct injection nozzle as the single-water nozzle of the third nozzle group.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810705641.5 | 2018-07-02 | ||
| CN201810705641.5A CN108930549B (en) | 2018-07-02 | 2018-07-02 | A kind of space multistory control dust removal method for moving frame dust for fully-mechanized mining working |
| PCT/CN2018/100433 WO2020006816A1 (en) | 2018-07-02 | 2018-08-14 | Three-dimensional space dust control and removal method used for dust produced during bracket motion of fully mechanized mining face |
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| AU2018431165A1 AU2018431165A1 (en) | 2021-01-07 |
| AU2018431165B2 true AU2018431165B2 (en) | 2022-03-17 |
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| AU2018431165A Ceased AU2018431165B2 (en) | 2018-07-02 | 2018-08-14 | Three-dimensional space dust control and removal method used for dust produced during bracket motion of fully mechanized mining face |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108930549B (en) |
| AU (1) | AU2018431165B2 (en) |
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- 2018-07-02 CN CN201810705641.5A patent/CN108930549B/en active Active
- 2018-08-14 WO PCT/CN2018/100433 patent/WO2020006816A1/en active Application Filing
- 2018-08-14 AU AU2018431165A patent/AU2018431165B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204140073U (en) * | 2014-08-19 | 2015-02-04 | 山东科技大学 | The two curtain device for reducing dust of a kind of air water for fully-mechanized mining working |
| CN105626134A (en) * | 2016-03-04 | 2016-06-01 | 山东科技大学 | Local area closed dust prevention and control method for fully mechanized coal mining working faces |
| CN107826620A (en) * | 2017-09-25 | 2018-03-23 | 宁夏天地奔牛实业集团有限公司 | The high working face cable trough and its spray method of smart spraying |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2018431165A1 (en) | 2021-01-07 |
| WO2020006816A1 (en) | 2020-01-09 |
| CN108930549B (en) | 2019-09-10 |
| CN108930549A (en) | 2018-12-04 |
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