CN109488296B - Automatic pressurizing method and system for built-in external spraying of coal mining machine - Google Patents
Automatic pressurizing method and system for built-in external spraying of coal mining machine Download PDFInfo
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- CN109488296B CN109488296B CN201910005624.5A CN201910005624A CN109488296B CN 109488296 B CN109488296 B CN 109488296B CN 201910005624 A CN201910005624 A CN 201910005624A CN 109488296 B CN109488296 B CN 109488296B
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- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000005065 mining Methods 0.000 title claims abstract description 56
- 238000005507 spraying Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 189
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000007921 spray Substances 0.000 claims abstract description 41
- 239000010705 motor oil Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 abstract description 16
- 239000000428 dust Substances 0.000 abstract description 7
- 229910001570 bauxite Inorganic materials 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 description 19
- 238000005452 bending Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- 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
- E21C35/22—Equipment for preventing the formation of, or for removal of, dust
- E21C35/226—Control valves for the spraying liquid used in dust suppression systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Spray Control Apparatus (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a built-in external spraying automatic pressurizing method and a system of a coal mining machine, wherein one path of spraying pressure water is used as a hydraulic medium to control a hydraulic reversing valve to reverse, so as to control an oil motor to work and stop, the oil motor is used for driving a water pump, and the other path of spraying pressure water is pressurized by the water pump and then is conveyed to a nozzle; the system is that the oil-out of gear pump connects the oil circuit valves, and the oil-out of oil circuit valves connects the second oil inlet of oil pond oil return port and two-position three-way valve, and the first, third oil inlets of two-position three-way valve connect the motor oil inlet and the oil pond oil return port of pump motor respectively, and the motor oil-out of pump motor connects the oil pond oil return port, and the hydraulic control mouth of two-position three-way valve and the pump water inlet of pump motor are connected to the spraying water pressure delivery port, and the water inlet of nozzle is connected to the pump water outlet of pump motor. The invention can automatically boost the spray water of the rocker arm of the coal mining machine, thereby obtaining high dust fall rate, ensuring that the nozzle is not easy to be blocked by coal dust, and being applicable to mining operations of coal, bauxite and the like.
Description
Technical Field
The invention relates to an automatic pressurizing method and system for spraying of a coal cutter, and belongs to the technical field of coal dust control of coal cutters.
Background
When the coal mining machine works underground, a spiral roller on a rocker arm is used for impacting a coal wall, a cutting pick on the roller breaks and falls off a coal layer, so that a large amount of coal dust is generated, and when the coal mining machine is used for mining other minerals, such as bauxite, and the like, corresponding coal dust is also generated. On one hand, a large amount of coal dust obstructs the sight of a coal cutter driver, so that the driver cannot see the position relationship among the roller, the hydraulic support and the coal wall, and normal production is prevented; on the other hand, dust is seriously threatened to physical health after being inhaled into the body by site workers. Therefore, effective measures must be taken to control the working face coal dust.
Coal dust generated by coal falling and coal loading of a coal mining working face is generally sprayed and restrained through nozzles on a rocker arm and a roller of the coal mining machine, the two nozzles are close to a coal dust generation source, the coal dust can be effectively removed as soon as the coal dust appears, the effect is obvious, however, in the actual production process, the nozzles are often blocked by coal dust due to insufficient spraying water pressure, if the maintenance force is insufficient, the water spraying amount is reduced, the coal dust restraint is not obvious, the spraying pressure of the nozzles is improved, the blocking is prevented, and the spraying water amount is kept.
At present, some coal mines are provided with external spraying devices on the coal mining machine, a controller, a water tank, a booster pump and the like are additionally added besides the coal mining machine, and the devices are arranged outside the machine body of the coal mining machine, such as a device train, so that more rubber pipes are dragged in the running and pushing processes of the coal mining machine, the bending radius of a cable clamping plate is increased, the passing space is reduced, and in addition, the exposed water spraying devices and water supply rubber pipes on the machine body are easy to be crushed by falling coal and worn by coal rocks.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the built-in and external spraying automatic pressurizing method and system for the coal mining machine, which can automatically pressurize spraying water of a rocker arm of the coal mining machine, so that high dust fall rate is obtained, and a nozzle is not easy to be blocked by coal dust.
The main technical scheme of the invention is as follows:
The automatic boosting method for built-in external spray of coal cutter includes dividing the water into two paths, using one path as the liquid control medium of liquid control reversing valve to control the reversing of liquid control reversing valve, and when the liquid control reversing valve is operated by the liquid control port, and the oil motor drives the water pump to operate and stop the water pump together with the oil motor, and the water pump is used to boost the other path of pressurized water and then deliver the pressurized water to the nozzle of built-in external spray device of coal cutter, so that the liquid control reversing valve, the oil motor and the water pump are all built in the body of coal cutter.
The utility model provides an automatic pressure boost system of built-in external spraying of coal-winning machine, including built-in oil tank, gear pump, oil circuit valves, two-position three-way valve and the pump motor of installing on the coal-winning machine body, the oil-out of oil tank is through oil pipe connection the oil inlet of gear pump, the oil-out of gear pump is through oil pipe connection the oil inlet of oil circuit valves, the oil-out of oil circuit valves is through oil pipe connection simultaneously oil return port in oil tank and the second oil inlet of two-position three-way valve, the first oil inlet and the third oil inlet of two-position three-way valve are respectively through oil pipe connection the motor oil inlet of pump motor and the oil return port in oil tank, the motor oil-out of pump motor is through oil pipe connection the oil return port in oil tank, two-position three-way valve is the hydraulic control switching valve that the spring reset, the spray water pressure delivery port of coal-winning machine is through water pipe connection simultaneously the hydraulic control mouth of two-way valve with the pump water inlet of pump motor, the pump inlet of pump motor is through water pipe connection water inlet that the water pipe connection is located on the coal-winning machine rocking arm, when the hydraulic control mouth of two-position three-way valve plays the work, first oil inlet and the second oil inlet, and the second oil inlet do not communicate with each other.
The water pipeline between the water outlet of the pump motor and the inlet of the nozzle is also preferably connected with a waterway valve group, and the waterway valve group is internally arranged on the coal mining machine body.
The waterway valve group can be provided with a first pressure gauge and a first overflow valve.
The gear pump adopts a duplex gear pump, two pumps of the duplex gear pump are respectively provided with an independent oil inlet and an independent oil outlet, the oil outlets of the two pumps are respectively connected with the oil inlet of the oil way valve group and the oil inlet of the coal mining machine heightening valve group through oil pipe pipelines, and the duplex gear pump is driven by a heightening motor of the coal mining machine.
And the oil way valve group can be provided with a second pressure gauge and a second overflow valve.
The nozzles are arranged on a left rocker arm and a right rocker arm of the coal mining machine in a dispersing mode, and the outlet pressure of the nozzles is preferably 8MPa.
The diameter of the water outlet of the nozzle can be 0.5mm.
The water pipe pipeline adopts a two-layer steel wire braided rubber pipe with the drift diameter phi 13, and the oil pipe pipeline adopts a two-layer steel wire braided rubber pipe with the drift diameter phi 10.
The two-position three-way valve comprises a valve rod, a valve body and a spring, wherein the valve rod is in sliding fit with the valve body in the valve body, the spring is installed at the left end of the valve rod, the right end of the valve rod is connected with a piston, the piston is located in a liquid control medium cavity sealed by the valve body and an end cover, the piston is in sliding fit with the inner wall of the valve body of the cavity, a water hole is formed in the end cover, the water hole is formed into a liquid control port, a first oil inlet, a second oil inlet and a third oil inlet are sequentially formed in the valve body from right to left, the inner ends of the water hole are respectively communicated with three valve body annular grooves in the valve body, left and right valve rod annular grooves are formed in the valve rod, when the valve rod is in a right station, the left annular grooves of the valve rod are respectively corresponding to the second oil inlet and the third oil inlet, and when the valve rod is in a left station, the right annular grooves of the valve rod are respectively corresponding to the first oil inlet and the second oil inlet.
The beneficial effects of the invention are as follows:
The invention improves the outlet pressure of the external spray water sprayed out by the rocker arm nozzle through automatic pressurization, obviously improves the coal dust prevention efficiency, and overcomes the problem that the spray is easy to block.
The external spray water is simultaneously connected with the two-position three-way valve and the pump motor, when the external spray water exists in the waterway rubber tube, the valve rod in the two-position three-way valve slides to the corresponding valve position, hydraulic oil enters the pump motor to drive the pump motor to pressurize the external spray water, when no water exists in the waterway rubber tube, the valve rod is reset, the hydraulic oil returns to the oil pool, and the pump motor does not work, so that the automatic pressurizing function of the spray water is realized, and idle running burning of the pump motor can be prevented. The pressurizing system is connected with the presence or absence of spray water, and the nozzle high-pressure spray dust fall and pressurizing automation on the rocker arm are realized by utilizing the two-position three-way valve.
All parts of the pressurizing system are arranged on the coal cutter body, pipelines are not additionally paved, power and water sources are not additionally added, roadway space is not occupied, and the pressurizing system is compact in structure and reasonable in arrangement.
The necessary gear pump on the coal mining machine is set as a duplex gear pump, one pump provides power hydraulic oil for a heightening oil way and a braking loop of the coal mining machine, and the other pump provides power hydraulic oil for a pressurizing system, so that the spraying water automatic pressurizing system is well simplified.
Drawings
FIG. 1 is a schematic diagram of one embodiment of an automatic boosting system of the present invention;
fig. 2 is a schematic structural view of the two-position three-way valve in fig. 1.
Reference numerals:
1-a left rocker arm; 2-a coal mining machine; 3-spraying water; 4-an oil pool; 5-a filter; 6-right traction part; 7-right rocker arm; 8-nozzles; 9-a water pipe line; 10-two-position three-way valve; 11-heightening a valve group; 12-an oil pipe line; 13-duplex gear pump; 14-a pump motor; 15-waterway valve group; 16-an oil way valve group; 17-a spring; 18-a valve body; 19-a valve stem; 20-water holes.
Detailed Description
The invention discloses an automatic boosting method for built-in and external spraying of a coal mining machine, which divides spraying pressure water into two paths, wherein one path is used as a liquid control medium of a liquid control reversing valve, the reversing of the liquid control reversing valve is controlled, and then the working and stopping of an oil motor are controlled.
When spraying is started, the hydraulic control port starts to play a role, the hydraulic control reversing valve reverses, hydraulic oil drives the oil motor to start working, the oil motor drives the water pump to work, the water pump applies work to the other path of spraying pressure water to pressurize and send the pressurized water to the nozzle, the outlet pressure of the nozzle is increased, the nozzle can be well prevented from being blocked, and the sufficient spraying water quantity is kept. Once the spraying function is closed, no spraying pressure water flows out, the hydraulic control reversing valve cannot reach the opening pressure to reset, hydraulic oil flows back to the oil tank through the hydraulic control reversing valve, the hydraulic oil does not enter the oil motor any more, the oil motor stops working after losing power, the water pump stops along with the loss of the power source of the oil motor, meanwhile, no spraying pressure water enters the water pump, and the automatic pressurization of the spraying pressure water is automatically stopped.
The hydraulic control reversing valve, the oil motor and the water pump are all arranged on the machine body of the coal mining machine, so that the spray device is arranged in the machine body, more rubber pipes are not required to be dragged in the running and propelling processes of the coal mining machine, and the bending radius of the original cable clamp plate is not influenced. And the built-in water supply hose can effectively protect the spraying device and the water supply hose from being injured and worn by coal dropping.
In order to achieve the method, the invention also discloses an internal and external spraying automatic pressurizing system of the coal mining machine, which is shown in fig. 1 and comprises an oil tank 4, a gear pump 13, an oil way valve bank 16, a two-position three-way valve 10 and a pump motor 14 which are internally arranged on the coal mining machine body, wherein an oil outlet of the oil tank is connected with an oil inlet of the gear pump through an oil pipe 12, an oil outlet of the gear pump is connected with an oil inlet of the oil way valve bank through the oil pipe, an oil outlet of the oil way valve bank is simultaneously connected with an oil return port of the oil tank and a second oil inlet of the two-position three-way valve through the oil pipe 12, a first oil inlet and a third oil inlet of the two-position three-way valve are respectively connected with a motor oil inlet of the pump motor and an oil return port of the oil tank through the oil pipe 12, and a motor oil outlet of the pump motor is connected with the oil return port of the oil tank through the oil pipe 12. The two-position three-way valve is a spring reset hydraulic control reversing valve, a spray water 3 pressure water outlet of the coal mining machine is simultaneously connected with a hydraulic control port of the two-position three-way valve and a pump water inlet of the pump motor through a water pipe pipeline 9, and a pump water outlet of the pump motor is connected with a water inlet of a nozzle 8 positioned on a rocker arm of the coal mining machine through a water pipe pipeline. When the hydraulic control port of the two-position three-way valve acts, the first oil inlet is communicated with the second oil inlet and is not communicated with the third oil inlet, otherwise, the second oil inlet is communicated with the third oil inlet and is not communicated with the first oil inlet.
The oil tank 4 is filled with N100 antiwear and antiwear hydraulic oil commonly used by the coal mining machine 2, a filter 5 is connected to a pipeline between the oil tank and a gear pump, the gear pump pumps out the hydraulic oil filtered by the filter 5 and then respectively conveys the hydraulic oil to a height-adjusting valve group and an oil way valve group, the hydraulic oil output by the oil way valve group is conveyed to a pump motor or the oil tank through the reversing control of a two-position three-way valve, the reversing control of the two-position three-way valve is performed according to whether spray water exists at a hydraulic control port or not, when the spray water exists, the hydraulic control port acts, the hydraulic oil is conveyed to the pump motor, otherwise, the hydraulic oil flows back to the oil tank and is directly unloaded. Hydraulic oil is conveyed to a pump motor, the pump motor works to boost the pressure of the other path of spray water, the boosted high-pressure water is respectively conveyed to a left rocker arm 1 and a right rocker arm 7 and is sprayed out through a nozzle 8, and spray dust settling treatment is carried out on coal dust generated by the coal mining machine 2. After the spray water is pressurized, the speed and flow sprayed out of the nozzle 8 are greatly improved, the spray water can be prevented from being blocked by coal ash, the spray fog torch is extended, and the coverage range of the fog torch to the dust-producing area of the coal cutting roller is enlarged.
The nozzles are arranged on the left rocker arm and the right rocker arm, the oil pool, the filter, the duplex gear pump, the heightening valve group, the oil way valve group, the two-position three-way valve and the pump motor are connected by a water pipe pipeline and an oil pipe pipeline and are arranged and arranged in the right traction part 6 of the coal mining machine 2, so that the onboard supercharging device is formed, and the connecting pipeline between the coal mining machine 2 and the outside is reduced.
The gear pump is preferably a duplex gear pump, the duplex gear pump is formed by arranging two pumps in parallel, each pump is provided with an independent oil inlet and an independent oil outlet, the two pumps work independently and simultaneously and do not interfere with each other, the oil outlets of the two pumps are respectively connected with the oil inlet of the oil way valve group and the oil inlet of the coal mining machine height-adjusting valve group 11 through oil pipe pipelines, and rated displacement of each pump is 8ml/r. The duplex gear pump is connected with an output shaft of a heightening motor on the right traction part 6 of the coal mining machine through a pump connecting assembly and is driven by the heightening motor. The power of the heightening motor is 10kW, and the hydraulic oil output by the duplex gear pump is respectively supplied to the heightening valve group 11 and the oil way valve group 16 through the oil pipe line 12. The heightening valve group is used for controlling the lifting of the left rocker arm 1 and the right rocker arm 7 and the opening of the brake by the coal mining machine and providing power oil for a heightening loop and a brake loop of the coal mining machine 2. The oil way valve group is used for providing power oil for the pump motor.
The pump motor 14 comprises a water pump and a motor, the motor is directly connected with the water pump, the structure is compact, the volume is small, and no pipeline is connected between the motor and the water pump. The water pump structure is a plunger pump. Hydraulic oil enters the motor, the motor is driven to do work on the water pump, the water pump does work on spray water entering from the inlet, the water flows out from the outlet after being pressurized, and the water outlet pressure is higher than the water inlet pressure. The pump motor 14 is designed according to the flow rate of the nozzle, the spray water pressurization value and the displacement profile of the gear pump 13. The pump motor 14 preferably employs the following parameters: the rated pressure of the water pump is 15MPa, the rated flow is 19.6l/min, the rated flow of the motor is 15l/min, the rated pressure is 14MPa, and the rated power is 3.7kW.
The water pipe 9 between the water outlet of the pump motor and the inlet of the nozzle is also preferably connected with a waterway valve group 15 which is also internally arranged on the coal cutter body, preferably in the right traction part.
The first pressure gauge and the first overflow valve can be installed on the waterway valve group, the pressure of pressurized spray water is displayed in real time by the first pressure gauge, the first overflow valve provides a high-pressure protection function, the set pressure is preferably 8MPa, and when the pressure of pressurized spray water is greater than 8MPa, the first overflow valve is opened for pressure relief.
The second pressure gauge and the second overflow valve are arranged on the oil way valve group, the measuring range of the second pressure gauge is 0-40MPa, the working pressure of the pump motor is displayed in real time, the set pressure of the second overflow valve is preferably 18MPa, when the pressure of the oil way of the system reaches 18MPa, the overflow valve is opened, hydraulic oil returns to an oil pool, and the pressure limiting protection effect on the pressurizing system is achieved.
The nozzles are arranged on the left rocker arm 1 and the right rocker arm 7 of the coal mining machine in a dispersing way, and the outlet pressure of the nozzles is preferably 8MPa. The pressurized spray water flows into the left rocker arm 1 and the right rocker arm 7 after passing through the waterway valve group 15, and is sprayed out through the nozzle 8. The number of nozzles is about 4.
The diameter of the water outlet of the nozzle is preferably determined to be 0.5mm according to the outlet pressure of the nozzle of 8MPa, the rated rotating speed 1750r/min of the pump motor 14, the rated flow rate of the motor of 19.6l/min and the rated discharge capacity of the single pump of the gear pump 13 of 8 ml/r.
The water pipe is preferably a two-layer steel wire braided rubber pipe with the drift diameter phi 13. The oil pipe pipeline is preferably a two-layer steel wire braided rubber pipe with the drift diameter phi 10.
The two-position three-way valve may be fixed to the housing of the right pulling part 6 by means of a tightening screw. The two-position three-way valve may include a valve stem 19, a valve body 18, and a spring 17. The valve rod is in sliding fit with the valve body in the valve body, the spring is installed at the left end of the valve rod, the right end of the valve rod is connected with a piston, the piston is located in a hydraulic medium cavity sealed by the valve body and the end cover, and the piston is in sliding fit with the inner wall of the valve body of the cavity. The end cap is provided with a water hole 20 which is formed into the hydraulic control port. The valve body is provided with a first oil inlet, a second oil inlet and a third oil inlet, the first oil inlet, the second oil inlet and the third oil inlet are sequentially formed in the valve body from right to left, the inner ends of the first oil inlet, the second oil inlet and the third oil inlet are respectively communicated with three valve body annular grooves in the valve body, two left and right valve rod annular grooves are formed in the valve rod, when the valve rod is in a right station (namely, when the valve rod is in the rightmost end, the valve rod is in a reset state as shown in fig. 2), the left annular groove of the valve rod is communicated with the valve body annular grooves corresponding to the second oil inlet and the third oil inlet, and when the valve rod is in a left station (at the moment, the spring is compressed under the pushing of a hydraulic control medium), the right annular groove of the valve rod is communicated with the valve body annular grooves corresponding to the first oil inlet and the second oil inlet.
After spray water enters the two-position three-way valve 10 from the water hole 20, the spring 17 is designed according to the opening pressure of 0.3Mpa, when the pressure is greater than 0.3Mpa, the valve rod 19 is pushed to move against the spring force, two adjacent valve body annular grooves on the right side of the valve body 18 are communicated by the right side annular groove of the valve rod on the valve rod 19, the oil port of the connecting oil way valve group 16 and the pump motor 14 are communicated, and hydraulic oil from the duplex gear pump 13 enters the pump motor 14. When the spray water pressure is less than 0.3Mpa, the valve rod 19 is reset under the action of spring force, and at the moment, the valve body 18 is connected with the oil port of the oil way valve group 16 and the oil pool 4, and the hydraulic oil from the gear pump 13 returns to the oil pool 4.
The invention can be used for preventing and controlling coal dust, and also can be used for preventing and controlling ore dust during mining of ore layers such as bauxite and the like.
Claims (10)
1. An automatic pressurization system of built-in outer spraying of coal-winning machine, its characterized in that: the hydraulic control system comprises an oil tank, a gear pump, an oil way valve group, a two-position three-way valve and a pump motor, wherein the oil tank, the gear pump, the oil way valve group, the two-position three-way valve and the pump motor are internally arranged on a coal cutter body, an oil outlet of the oil tank is connected with an oil inlet of the gear pump through an oil pipe, an oil outlet of the gear pump is connected with an oil inlet of the oil way valve group through an oil pipe, an oil outlet of the oil way valve group is simultaneously connected with an oil return port of the oil tank and a second oil inlet of the two-position three-way valve through an oil pipe, a first oil inlet and a third oil inlet of the two-position three-way valve are respectively connected with a motor oil inlet of the pump motor and an oil return port of the oil tank through oil pipe, a motor oil outlet of the pump motor is connected with an oil return port of the oil tank through an oil pipe, a spray water pressure water outlet of the coal cutter is simultaneously connected with a hydraulic control port of the two-position three-way valve and a pump water inlet of the pump motor through a water pipe, and when the hydraulic control ports of the two-position three-way valve are in operation, the two-way valve is communicated with each other, and the two-position three-way valve is not communicated with each other, and otherwise.
2. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: and a waterway valve group is connected on a water pipeline between the water outlet of the pump motor and the inlet of the nozzle, and the waterway valve group is internally arranged on the coal mining machine body.
3. The internal external spray automatic pressurization system of a coal mining machine according to claim 2, wherein: and the waterway valve group is provided with a first pressure gauge and a first overflow valve.
4. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: the gear pump adopts a duplex gear pump, two pumps of the duplex gear pump are respectively provided with an independent oil inlet and an independent oil outlet, the oil outlets of the two pumps are respectively connected with the oil inlet of the oil way valve group and the oil inlet of the coal mining machine heightening valve group through oil pipe pipelines, and the duplex gear pump is driven by a heightening motor of the coal mining machine.
5. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: and the oil way valve group is provided with a second pressure gauge and a second overflow valve.
6. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: the nozzles are arranged on a left rocker arm and a right rocker arm of the coal mining machine in a dispersing mode, and the outlet pressure of the nozzles is 8MPa.
7. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: the diameter of the water outlet of the nozzle is 0.5mm.
8. The internal external spray automatic pressurization system of a coal mining machine according to claim 1, wherein: the water pipe pipeline adopts a two-layer steel wire braided rubber pipe with the drift diameter phi 13, and the oil pipe pipeline adopts a two-layer steel wire braided rubber pipe with the drift diameter phi 10.
9. The internal external spray automatic pressurization system for a coal mining machine according to any one of claims 1 to 8, wherein: the two-position three-way valve comprises a valve rod, a valve body and a spring, wherein the valve rod is in sliding fit with the valve body in the valve body, the spring is installed at the left end of the valve rod, the right end of the valve rod is connected with a piston, the piston is located in a liquid control medium cavity sealed by the valve body and an end cover, the piston is in sliding fit with the inner wall of the valve body of the cavity, a water hole is formed in the end cover, the water hole is formed into a liquid control port, a first oil inlet, a second oil inlet and a third oil inlet are sequentially formed in the valve body from right to left, the inner ends of the water hole are respectively communicated with three valve body annular grooves in the valve body, left and right valve rod annular grooves are formed in the valve rod, when the valve rod is in a right station, the left annular grooves of the valve rod are respectively corresponding to the second oil inlet and the third oil inlet, and when the valve rod is in a left station, the right annular grooves of the valve rod are respectively corresponding to the first oil inlet and the second oil inlet.
10. An automatic pressurizing method for built-in external spraying of a coal mining machine is characterized in that: the built-in external spray automatic pressurization system of the coal mining machine according to any one of claims 1-9 is adopted, spray pressure water is divided into two paths, one path is used as a hydraulic medium of a hydraulic control reversing valve, reversing of the hydraulic control reversing valve is controlled, and further work and stop of an oil motor are controlled, when a control logic of the hydraulic control reversing valve is that a hydraulic control port works, the working position of the hydraulic control reversing valve is a position where the oil motor works, a water pump is driven by the oil motor, the water pump works and stops along with the oil motor, the other path of spray pressure water is pressurized by the water pump and then is conveyed to a nozzle of a built-in external spray device of the coal mining machine, and the hydraulic control reversing valve, the oil motor and the water pump are all built in a machine body of the coal mining machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005624.5A CN109488296B (en) | 2019-01-03 | 2019-01-03 | Automatic pressurizing method and system for built-in external spraying of coal mining machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005624.5A CN109488296B (en) | 2019-01-03 | 2019-01-03 | Automatic pressurizing method and system for built-in external spraying of coal mining machine |
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