Underground coal mine air and water pumping switching electro-hydraulic control system and method

Abstract

The invention provides an underground coal mine air and water pumping switching electro-hydraulic control system and method, the electro-hydraulic control system comprises an air supply control module, a water supply control module, a negative pressure control module and an oil supply module, and the method adopts a remote control system to control the underground coal mine air and water pumping switching electro-hydraulic control system. According to the underground coal mine air and water pumping switching electro-hydraulic control system, air and water pumping electric control rapid opening and closing and rapid switching of different functions are achieved, the automation degree of air and water pumping switching is improved, and the air and water pumping switching time is shortened; and meanwhile, when dangerous working conditions that gas accumulation exceeds the limit due to hole blocking behind the drill hole or carbon monoxide gas appears in the drill hole and the like, rapid and automatic response processing can be achieved. The air and water pumping conversion efficiency is improved, the labor intensity of workers is relieved, and key technical support is provided for coal mine underground automatic drilling whole-process operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground coal mine drilling, and relates to a control device for air-water-gas pumping switching, in particular to an electro-hydraulic control system and method for air-water-gas pumping switching in underground coal mines. Background Art

[0002] In recent years, with the increase of the mining depth of some coal mines, the workload of gas control has become larger and larger. Underground drilling and gas extraction is the main means of gas control. At present, the automation degree of underground drilling rigs for gas extraction is getting higher and higher, but most of the air-water-gas pumping conversion devices supporting the drilling rigs are pure manual control or ordinary electric ball valve control, which can only realize single air supply, water supply or gas extraction. The opening and closing speed is slow. When switching between air, water and gas pumping, it is necessary to manually plug and unplug pipelines of different media. The automation degree is low, the labor intensity is high, and there is no automatic and rapid response mechanism when gas accumulation exceeds the limit due to hole plugging behind the drill hole or carbon monoxide gas appears in the drill hole.

[0003] In view of the above problems, an air-water-gas pumping conversion device can be used to replace operations such as manual plugging and unplugging. The existing air-water-gas pumping conversion device uses a two-way three-way manual ball valve in cooperation with the control of manual valves and manual valves, which can connect the negative pressure pipeline with the conveying pipeline, or connect the air supply pipeline with the conveying pipeline, or connect the water supply pipeline with the conveying pipeline. By switching the two-way three-way valve, the switching between air supply and negative pressure or the switching between water supply and negative pressure can be quickly realized, so that the air-water-gas pumping conversion device can be switched in advance to realize the pre-extraction of gas in the hole.

[0004] The main defects of the existing technology are: the switching among air, water and gas pumping are all manual valves, which need to be manually switched by operators, and do not have the function of "one-key" rapid switching by electric control, nor the function of automatic and rapid response processing under certain dangerous working conditions. Summary of the Invention

[0005] Aiming at the defects and deficiencies of the existing technology, the purpose of the present invention is to provide an electro-hydraulic control system and method for air-water-gas pumping switching in underground coal mines, so as to solve the technical problems in the existing technology such as slow manual switching speed, high labor intensity, or long response time of the air-water-gas pumping conversion controlled by a transmission electric control ball valve.

[0006] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0007] An electro-hydraulic control system for air-water-gas pumping switching in underground coal mines, characterized in that it includes an air supply control module, a water supply control module, a negative pressure control module and an oil supply module.

[0008] The described air supply control module includes an air supply pipeline. The air inlet end of the air supply pipeline is connected to the air supply equipment, and the air outlet end of the air supply pipeline is connected to one side of the air supply hydraulic directional control valve. The other side of the air supply hydraulic directional control valve is connected to the air inlet section of the collecting pipeline; the air supply hydraulic directional control valve is integrated with an air supply pilot solenoid valve.

[0009] The described water supply control module includes a water supply pipeline. The water inlet end of the water supply pipeline is connected to the water supply equipment, and the water outlet end of the water supply pipeline is connected to one side of the water supply hydraulic directional control valve. The other side of the water supply hydraulic directional control valve is connected to the water inlet section of the collecting pipeline; the water supply hydraulic directional control valve is integrated with a water supply pilot solenoid valve.

[0010] The described negative pressure control module includes a negative pressure pipeline. One end of the negative pressure pipeline is connected to the negative pressure equipment, and the other end of the negative pressure pipeline is connected to one side of the negative pressure hydraulic directional control valve. The other side of the negative pressure hydraulic directional control valve is connected to the negative pressure section of the collecting pipeline; the negative pressure hydraulic directional control valve is integrated with a negative pressure pilot solenoid valve.

[0011] The connection points of the air inlet section, water inlet section, and negative pressure section of the described collecting pipeline are the collecting ports. The collecting ports are connected to one end of the drill rig water braid connection pipeline, and the other end of the drill rig water braid connection pipeline is connected to the drill rig water braid.

[0012] The described oil supply module includes an oil tank. An oil tank oil supply pipeline and an oil tank oil return pipeline are connected to the oil tank; the oil outlet end of the oil tank oil supply pipeline is connected to the first interface of the master control solenoid valve. The second interface of the master control solenoid valve is connected to the oil inlet end of the oil inlet control pipeline through a pipeline. The third interface of the master control solenoid valve is connected to the oil outlet end of the oil return control pipeline through a pipeline. The fourth interface of the master control solenoid valve is connected to the oil tank oil return pipeline.

[0013] The first oil passage section of the described oil inlet control pipeline is connected to the first interface of the air supply pilot solenoid valve. The second interface of the air supply pilot solenoid valve is connected to the first oil passage end of the air supply hydraulic directional control valve through a pipeline; the second oil passage end of the air supply hydraulic directional control valve is connected to the third interface of the air supply pilot solenoid valve through a pipeline. The fourth interface of the air supply pilot solenoid valve is connected to the first oil return section of the oil return control pipeline.

[0014] The second oil passage section of the described oil inlet control pipeline is connected to the first interface of the water supply pilot solenoid valve. The second interface of the water supply pilot solenoid valve is connected to the first oil passage end of the water supply hydraulic directional control valve through a pipeline; the second oil passage end of the water supply hydraulic directional control valve is connected to the third interface of the water supply pilot solenoid valve through a pipeline. The fourth interface of the water supply pilot solenoid valve is connected to the second oil return section of the oil return control pipeline.

[0015] The third oil supply section of the oil inlet control pipeline is connected to the first interface of the negative pressure pilot solenoid valve. The second interface of the negative pressure pilot solenoid valve is connected to the first oil supply end of the negative pressure hydraulic directional control valve through a pipeline. The second oil supply end of the negative pressure hydraulic directional control valve is connected to the third interface of the negative pressure pilot solenoid valve through a pipeline, and the fourth interface of the negative pressure pilot solenoid valve is connected to the third oil return section of the oil return control pipeline.

[0016] The present invention also has the following technical features:

[0017] A supply air control check valve is provided at the air inlet end of the supply air pipeline.

[0018] A water supply filter is provided at the water inlet end of the water supply pipeline.

[0019] A drainage filter is provided on the drill rig water braid connection pipeline.

[0020] A motor pump set and a pressure reducing valve are provided on the oil tank oil supply pipeline.

[0021] An oil tank filter is provided on the oil tank oil return pipeline.

[0022] An air supply handle, a water supply handle and a negative pressure handle are respectively provided on the air supply hydraulic directional control valve, the water supply hydraulic directional control valve and the negative pressure hydraulic directional control valve.

[0023] An air pressure gauge and a pressure sensor are connected to the air supply pipeline; a water pressure gauge and a pressure sensor are connected to the water supply pipeline; a negative pressure gauge and a pressure sensor are connected to the negative pressure pipeline.

[0024] The present invention also protects a coal mine underground air-water-drainage switching electro-hydraulic control method, which uses a remote control system to control the coal mine underground air-water-drainage switching electro-hydraulic control system as described above; the remote control system includes a controller, a remote control transmitter, a remote control receiver and a CAN bus.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] (Ⅰ) The coal mine underground air-water-drainage switching electro-hydraulic control system of the present invention realizes the fast opening and closing of the air-water-drainage electro-control and the fast switching of different functions, improves the automation degree of the air-water-drainage conversion, and reduces the air-water-drainage conversion time; at the same time, when dangerous working conditions such as gas accumulation exceeding the limit due to blockage of the hole behind the drill hole or the presence of carbon monoxide gas in the drill hole occur, it can achieve fast automatic response and treatment. The present invention improves the air-water-drainage conversion efficiency, reduces the labor intensity of workers, and provides key technical support for the whole process of automatic drilling in coal mines underground.

[0027] (Ⅱ) The air-water-drainage switching electro-hydraulic control system of the present invention has a manual operation function to achieve the emergency purpose when the electric control switching fails, greatly improving the on-site adaptability and practicability of the device.

[0028] (Ⅲ) The air-water-drainage switching electro-hydraulic control system of the present invention can match any type of drilling rig to achieve the function of fast switching of air-water-drainage electric control, with high applicability. Brief Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure of the air-water-drainage switching electro-hydraulic control system for underground coal mines.

[0030] Figure 2 It is a schematic diagram of the working state of the air-water-drainage switching electro-hydraulic control system for underground coal mines.

[0031] Figure 3 It is a schematic diagram of the structure of the remote control transmitter.

[0032] The meanings of the reference numerals in the figure are as follows: 1 air supply pipeline, 2 air supply hydraulic directional control valve, 3 collecting pipeline, 4 air supply pilot solenoid valve, 5 water supply pipeline, 6 water supply hydraulic directional control valve, 7 water supply pilot solenoid valve, 8 negative pressure pipeline, 9 negative pressure hydraulic directional control valve, 10 negative pressure pilot solenoid valve, 11 collecting port, 12 drilling rig water braid connection pipeline, 13 oil tank, 14 oil tank oil supply pipeline, 15 oil tank oil return pipeline, 16 master control solenoid valve, 17 oil inlet control pipeline, 18 oil return control pipeline, 19 air supply control check valve, 20 water supply filter, 21 drainage filter, 22 motor pump unit, 23 pressure reducing valve, 24 oil tank filter, 25 air supply handle, 26 water supply handle, 27 negative pressure handle.

[0033] The technical solutions of the present invention will be further described below in conjunction with embodiments. Detailed Embodiments

[0034] In the present invention, the meaning of "air-water-drainage switching" is that the electro-hydraulic control system can realize the switching of ventilation, water supply and gas drainage.

[0035] It should be noted that all the components, instruments, meters and equipment used in the present invention, without special instructions, are all the components, instruments, meters and equipment known in the art. For example:

[0036] The controller adopts a conventional explosion-proof and intrinsically safe controller for underground coal mines known in the prior art.

[0037] The air supply equipment adopts a conventional air supply equipment known in the prior art, including air ducts, fans, etc.

[0038] The water supply equipment adopts a conventional water supply equipment known in the prior art, including water tanks, feed pumps, etc.

[0039] The negative pressure device adopts a conventional negative pressure device known in the prior art, including a gas drainage pipeline, a negative pressure pump, etc.

[0040] The air supply hydraulic directional control valve 2, the water supply hydraulic directional control valve 6, and the negative pressure hydraulic directional control valve 9 all adopt conventional two-position two-way hydraulic directional control valves known in the prior art.

[0041] The air supply pilot solenoid valve 4, the water supply pilot solenoid valve 7, the negative pressure pilot solenoid valve 10, and the master control solenoid valve 16 all adopt conventional two-position four-way electromagnetic directional control valves known in the prior art.

[0042] In compliance with the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0043] Embodiment 1:

[0044] This embodiment provides a mine underground air-water suction switching electro-hydraulic control system, including an air supply control module, a water supply control module, a negative pressure control module, and an oil supply module.

[0045] As Figure 1 shown, the air supply control module includes an air supply pipeline 1. The air inlet end of the air supply pipeline 1 is communicated with an air supply device, and the air outlet end of the air supply pipeline 1 is connected to one side of the air supply hydraulic directional control valve 2. The other side of the air supply hydraulic directional control valve 2 is connected to the air inlet section of a collecting pipeline 3; the air supply hydraulic directional control valve 2 is integrated with an air supply pilot solenoid valve 4.

[0046] As Figure 1 shown, the water supply control module includes a water supply pipeline 5. The water inlet end of the water supply pipeline 5 is communicated with a water supply device, and the water outlet end of the water supply pipeline 5 is connected to one side of the water supply hydraulic directional control valve 6. The other side of the water supply hydraulic directional control valve 6 is connected to the water inlet section of the collecting pipeline 3; the water supply hydraulic directional control valve 6 is integrated with a water supply pilot solenoid valve 7.

[0047] As Figure 1 shown, the negative pressure control module includes a negative pressure pipeline 8. One end of the negative pressure pipeline 8 is communicated with a negative pressure device, and the other end of the negative pressure pipeline 8 is connected to one side of the negative pressure hydraulic directional control valve 9. The other side of the negative pressure hydraulic directional control valve 9 is connected to the negative pressure section of the collecting pipeline 3; the negative pressure hydraulic directional control valve 9 is integrated with a negative pressure pilot solenoid valve 10.

[0048] As Figure 1 shown, the connection point of the air inlet section, the water inlet section, and the negative pressure section of the collecting pipeline 3 is a collecting port 11. The collecting port 11 is communicated with one end of a drilling rig water braid connecting pipeline 12, and the other end of the drilling rig water braid connecting pipeline 12 is communicated with the drilling rig water braid.

[0049] AsFigure 1 As shown in the figure, the oil supply module includes an oil tank 13, and an oil tank oil supply pipeline 14 and an oil tank oil return pipeline 15 are connected to the oil tank 13; the oil outlet end of the oil tank oil supply pipeline 14 is connected to the first interface of the master control solenoid valve 16, and the second interface of the master control solenoid valve 16 is communicated with the oil inlet end of the oil inlet control pipeline 17 through a pipeline, the third interface of the master control solenoid valve 16 is communicated with the oil outlet end of the oil return control pipeline 18 through a pipeline, and the fourth interface of the master control solenoid valve 16 is connected to the oil tank oil return pipeline 15.

[0050] As Figure 1 shown in the figure, the first oil passage section of the oil inlet control pipeline 17 is connected to the first interface of the air supply pilot solenoid valve 4, and the second interface of the air supply pilot solenoid valve 4 is communicated with the first oil passage end of the air supply hydraulic reversing valve 2 through a pipeline; the second oil passage end of the air supply hydraulic reversing valve 2 is connected to the third interface of the air supply pilot solenoid valve 4 through a pipeline, and the fourth interface of the air supply pilot solenoid valve 4 is connected to the first oil return section of the oil return control pipeline 18.

[0051] As Figure 1 shown in the figure, the second oil passage section of the oil inlet control pipeline 17 is connected to the first interface of the water supply pilot solenoid valve 7, and the second interface of the water supply pilot solenoid valve 7 is communicated with the first oil passage end of the water supply hydraulic reversing valve 6 through a pipeline; the second oil passage end of the water supply hydraulic reversing valve 6 is connected to the third interface of the water supply pilot solenoid valve 7 through a pipeline, and the fourth interface of the water supply pilot solenoid valve 7 is connected to the second oil return section of the oil return control pipeline 18.

[0052] As Figure 1 shown in the figure, the third oil passage section of the oil inlet control pipeline 17 is connected to the first interface of the negative pressure pilot solenoid valve 10, and the second interface of the negative pressure pilot solenoid valve 10 is communicated with the first oil passage end of the negative pressure hydraulic reversing valve 9 through a pipeline; the second oil passage end of the negative pressure hydraulic reversing valve 9 is connected to the third interface of the negative pressure pilot solenoid valve 10 through a pipeline, and the fourth interface of the negative pressure pilot solenoid valve 10 is connected to the third oil return section of the oil return control pipeline 18.

[0053] In this embodiment, the oil supply module is composed of an oil tank oil supply pipeline 14, an oil tank oil return pipeline 15, a master control solenoid valve 16, an oil inlet control pipeline 17 and an oil return control pipeline 18. The oil supply module is used to provide pilot oil for each valve. The collection port 11 of the mine underground water, air and suction switching electro-hydraulic control system is connected to the drill water swivel. As Figure 1 shown in the figure, the oil inlet ports P1, P2, P3 and the oil outlet ports T1, T2, T3 are the pilot drive pressure oil supplied by the drill pump station, which realizes the commutation of the pilot oil control spool after the electric control instruction is issued, and realizes the rapid opening, closing and switching of water, air and suction. The opening, closing and switching time is less than 1 s.

[0054] In this embodiment, the air supply control module is composed of an air supply pipeline 1, an air supply hydraulic directional control valve 2, and an air supply pilot solenoid valve 4. The air supply hydraulic directional control valve 2 and the air supply pilot solenoid valve 4 together form an air supply combined valve, and the air supply combined valve controls the on-off of the compressed air during drilling through commutation control. As Figure 1 shown, after the air supply pilot solenoid valve 4 receives a voltage signal, it commutates and opens, allowing the oil to enter the air supply hydraulic directional control valve 2 from A1. The oil pushes the spool of the air supply hydraulic directional control valve 2 to move to the right until the air outlet end of the air supply pipeline 1 is connected to the air inlet section of the collecting pipeline 3. Then, the airflow generated by the air supply equipment can flow to the collecting port 11, and the oil flows out from B1 under the extrusion of the spool of the air supply hydraulic directional control valve 2.

[0055] In this embodiment, the water supply control module is composed of a water supply pipeline 5, a water supply hydraulic directional control valve 6, and a water supply pilot solenoid valve 7. The water supply hydraulic directional control valve 6 and the water supply pilot solenoid valve 7 together form a water supply combined valve, and the water supply combined valve controls the on-off of the static pressure water during drilling through commutation. As Figure 1 shown, after the water supply pilot solenoid valve 7 receives a voltage signal, it commutates and opens, allowing the oil to enter the water supply hydraulic directional control valve 6 from A3. The oil pushes the spool of the water supply hydraulic directional control valve 6 to move to the right until the water outlet end of the water supply pipeline 5 is connected to the water inlet section of the collecting pipeline 3. Then, the water flow generated by the water supply equipment can flow to the collecting port 11, and the oil flows out from B3 under the extrusion of the spool of the air supply hydraulic directional control valve 2.

[0056] In this embodiment, the negative pressure control module is composed of a negative pressure pipeline 8, a negative pressure hydraulic directional control valve 9, and a negative pressure pilot solenoid valve 10. The negative pressure pilot solenoid valve 10 and the negative pressure hydraulic directional control valve 9 together form a negative pressure combined valve. After the negative pressure pilot solenoid valve 10 receives a voltage signal, it supplies oil to the negative pressure hydraulic directional control valve 9 and controls the commutation of the negative pressure hydraulic directional control valve 9. As Figure 1 shown, when the oil enters the negative pressure hydraulic directional control valve 9 from A2, it pushes the spool of the negative pressure hydraulic directional control valve 9 to move to the right, making the other end of the negative pressure pipeline 8 connected to the negative pressure section of the collecting pipeline 3, so that the negative pressure equipment can extract the gas accumulated in the drill pipe behind the drill hole during drilling. The oil flows out from B2 under the extrusion of the spool of the negative pressure hydraulic directional control valve 9.

[0057] In this embodiment, when the airflow and the water flow converge at the collecting port 11, they enter the drill hole through the collecting port 11, the drill rig water swivel connecting pipeline 12, and the drill pipe for flushing and slag discharging; during negative pressure extraction, the gas can flow back into the hydraulic valve through the collecting port 11 and then enter the gas drainage pipeline.

[0058] As a specific solution of this embodiment, as Figure 1As shown, an air supply control check valve 19 is provided at the air inlet end of the air supply pipe 1. In this embodiment, the air supply control check valve 19 can prevent the gas accumulated in the borehole from flowing back and causing a gas over-limit accident when the air pressure at the air inlet stops.

[0059] As a specific solution of this embodiment, Figure 1 As shown, a water supply filter 20 is provided at the water inlet end of the water supply pipe 5. In this embodiment, the water supply filter 20 can filter out impurities such as mud and sand in the drilling static pressure water to prevent the mud and sand from polluting or damaging the seal of the water supply hydraulic reversing valve 6.

[0060] As a specific solution of this embodiment, Figure 1 As shown, a drainage filter 21 is provided on the drilling rig water braid connecting pipe 12. In this embodiment, the drainage filter 21 can prevent foreign objects such as mud, stones, etc. at the bottom of the hole from entering the electro-hydraulic control system during negative pressure drainage, causing the electro-hydraulic control system to malfunction.

[0061] As a specific solution of this embodiment, Figure 1 As shown, a motor pump group 22 and a pressure reducing valve 23 are provided on the oil tank oil delivery pipeline 14. In this embodiment, the motor pump group 22 is a motor pump group provided by the drilling rig, and a pressure reducing valve 23 is provided at the outlet of the pump to adjust the pilot oil pressure supplied to the entire electro-hydraulic control system to 2-5 MPa.

[0062] As a specific solution of this embodiment, Figure 1 As shown, a fuel tank filter 24 is provided on the fuel tank return pipeline 15. In this embodiment, the fuel tank filter 24 is used to filter impurities in the return oil.

[0063] As a specific solution of this embodiment, Figure 1 As shown, the M1 pressure measuring port on the air supply duct 1 is used to measure the drilling air pressure, which is specifically achieved through an air pressure gauge and a pressure sensor.

[0064] As a specific solution of this embodiment, Figure 1 As shown, the M3 pressure measuring port on the water supply pipe 5 is used to measure the drilling water pressure, which is specifically achieved through a water pressure gauge and a pressure sensor.

[0065] As a specific solution of this embodiment, Figure 1As shown, the pressure measuring port M2 on the negative pressure pipeline 8 is used to measure the extraction negative pressure. One end of the negative pressure pipeline 8 is connected to the gas drainage port, and the sensor set at the gas drainage port can monitor the extraction gas negative pressure and CO concentration. When the monitored negative pressure value is greater than the set threshold, it indicates that the hole is blocked behind the drill hole, the air supply or water supply function is closed, and the negative pressure function is turned on to extract the gas accumulated in the drill hole from the drill pipe to prevent the occurrence of blowout and buried drill accidents. When the monitored CO concentration is greater than the set threshold, it indicates that there may be a dry friction between the drill bit, drill pipe and coal seam, causing a coal seam fire accident at the bottom of the hole. The air and water functions are automatically switched, the air supply is closed, and the water supply is turned on to prevent a more serious fire accident.

[0066] As a specific solution of this embodiment, as Figure 1 shown, an air supply handle 25, a water supply handle 26 and a negative pressure handle 27 are respectively arranged on the air supply hydraulic directional control valve 2, the water supply hydraulic directional control valve 6 and the negative pressure hydraulic directional control valve 9. In this embodiment, the master control solenoid valve 16 realizes the supply and cut-off of the pilot oil of the device. When the electro-hydraulic control system uses the electric control function, the master control solenoid valve 16 is energized. After the oil is decompressed by the pressure reducing valve 23, it first enters the master control solenoid valve 16, and then enters the air supply pilot solenoid valve 4, the water supply pilot solenoid valve 7 and the negative pressure pilot solenoid valve 10. When the system is powered off, the master control solenoid valve 16 automatically loses power and the pilot oil is not available. At this time, the air supply, water supply and extraction functions of the device can be manually turned on / off through the air supply handle 25, the water supply handle 26 and the negative pressure handle 27. The handle ensures that the air, water and extraction function switching can still be realized in case of power failure at the drill site or failure of the electric control system.

[0067] Embodiment 2:

[0068] This embodiment provides a method for electro-hydraulic control of air, water and extraction switching in coal mines. This method uses a remote control system to control the electro-hydraulic control system for air, water and extraction switching in coal mines of Embodiment 1, as Figure 2 shown, the remote control system includes a controller, a remote control transmitter, a remote control receiver and a CAN bus.

[0069] As Figure 3As shown in the figure, the operation interface of the remote control transmitter is designed with 8 buttons: on / off air, on / off water, on / off extraction, pilot off, and emergency stop. Among them, on / off air, on / off water, on / off extraction, and pilot off respectively correspond to controlling the on / off of the air supply pilot solenoid valve 4, the water supply pilot solenoid valve 7, the negative pressure pilot solenoid valve 10, and the master control solenoid valve 16. After the remote control transmitter sends control instructions (on / off air, on / off water, on / off extraction), the remote control receiver receives the instructions and transmits them to the controller through the CAN bus. The controller outputs a control voltage through the designed control method to control the operation of each electromagnet of the composite valve, thereby controlling the rapid execution of corresponding on / off air, on / off water, on / off extraction single-action operations, or the rapid linkage conversion of air / water, air / extraction, and water / extraction in the underground coal mine air-water-extraction switching electro-hydraulic control system. The specific steps of this method are as follows:

[0070] Step 1, Remote control operation function control:

[0071] Step 1.1, Remote control / manual operation: When the device is powered on, first make the master control solenoid valve 16 energized, and the device automatically admits pilot oil. At this time, the corresponding electro-hydraulic operations can be performed through the air-water-extraction push-button switches set by the remote control, and the manual operation of the handle fails. After pressing the "pilot off" button, the master control solenoid valve 16 loses power, and the pilot oil is not admitted. Only then can the on / off and switching functions of the air supply hydraulic directional control valve 2, the water supply hydraulic directional control valve 6, and the negative pressure hydraulic directional control valve 9 be manually realized through the hydraulic valve handle, and the remote control operation fails at this time.

[0072] Step 1.2, Remote control single-action switch operation: When the device is powered on, first make the master control solenoid valve 16 energized and the pilot oil is admitted. After pressing the "open water" button on the remote control transmitter, the water supply pilot solenoid valve 7 is energized and commutated to admit pilot oil, and the water control water supply hydraulic directional control valve 6 opens, and the drill rig is supplied with water. After pressing the "close water" button, the water supply pilot solenoid valve 7 loses power and commutates, and the water control water supply hydraulic directional control valve 6 closes. The methods for remote control single-action on / off air and on / off extraction are the same.

[0073] Step 1.3, Quick switching function operation: When the water control water supply hydraulic directional control valve 6 is working, press the "open air" button, the air supply pilot solenoid valve 4 is energized and commutated to control the opening of the air supply hydraulic directional control valve 2. At the same time, the water supply pilot solenoid valve 7 loses power and commutates, and the water control water supply hydraulic directional control valve 6 closes, realizing one-key quick switching of air and water. The functions of quick switching between air and extraction, and water and extraction are the same.

[0074] Step 1.4, Interlock function: According to the actual drilling working conditions, only one function can be executed simultaneously among air supply, water supply, and gas extraction, that is, the electro-hydraulic actions of opening air, opening water, and opening extraction are interlocked with each other, and two or three of them cannot be opened simultaneously.

[0075] Step 1.5, Emergency stop function: The emergency stop button on the remote control transmitter is used to cut off the power supply of the drill rig in some emergency situations, which is equivalent to the emergency stop switch function of the drill rig.

[0076] Step 2, Automatic Triggering Device Fast Switching Function Control:

[0077] Step 2.1, Automatic Switching between Air Extraction and Water Extraction:

[0078] The negative pressure sensor set at the pressure measuring port M2 monitors that the negative pressure of the extracted gas is T P , when the monitored value T P is greater than the set first-level threshold T P1 , the sensor alarms, indicating that there may be an overlimit situation of gas accumulation due to blockage behind the drill hole. The operator stops drilling for inspection and treatment; if when T P is greater than the set second-level threshold T P2 T P2 >T P1 , the fast switching function is automatically triggered to handle the accident, that is, the air supply or water supply function is closed, and the negative pressure function is turned on to extract the gas accumulated in the drill hole from the drill pipe, preventing the occurrence of blowout and buried drill accidents.

[0079] Step 2.2, Automatic Fast Switching between Air and Water:

[0080] The carbon monoxide concentration sensor set at the pressure measuring port M2 monitors the CO concentration value. When the monitored value T C is greater than the set first-level threshold T C1 , the sensor alarms, indicating that there may be an accident of coal seam ignition at the bottom of the hole caused by dry friction between the drill bit, drill pipe and coal seam. The operator stops drilling for inspection and treatment; if when T C is greater than the set second-level threshold T C2 T C2 >T C1 , the fast switching function is automatically triggered to handle the accident, that is, the air supply is closed and the water supply is turned on, and the drill rig injects water into the drill hole to extinguish the fire, preventing the occurrence of more serious fire accidents.

Claims

1. A hydraulic electro-control system for switching between water and air pumping in underground coal mines, characterized in that, It includes an air supply control module, a water supply control module, a negative pressure control module and an oil supply module; The air supply control module includes an air supply pipeline (1). The air inlet end of the air supply pipeline (1) is communicated with an air supply device. The air outlet end of the air supply pipeline (1) is connected to one side of an air supply hydraulic directional control valve (2). The other side of the air supply hydraulic directional control valve (2) is connected to the air inlet section of a collecting pipeline (3). The air supply hydraulic directional control valve (2) is integrated with an air supply pilot solenoid valve (4); The water supply control module includes a water supply pipeline (5). The water inlet end of the water supply pipeline (5) is communicated with a water supply device. The water outlet end of the water supply pipeline (5) is connected to one side of a water supply hydraulic directional control valve (6). The other side of the water supply hydraulic directional control valve (6) is connected to the water inlet section of the collecting pipeline (3). The water supply hydraulic directional control valve (6) is integrated with a water supply pilot solenoid valve (7); The negative pressure control module includes a negative pressure pipeline (8). One end of the negative pressure pipeline (8) is communicated with a negative pressure device. The other end of the negative pressure pipeline (8) is connected to one side of a negative pressure hydraulic directional control valve (9). The other side of the negative pressure hydraulic directional control valve (9) is connected to the negative pressure section of the collecting pipeline (3). The negative pressure hydraulic directional control valve (9) is integrated with a negative pressure pilot solenoid valve (10); The connection point of the air inlet section, the water inlet section and the negative pressure section of the collecting pipeline (3) is a collecting port (11). The collecting port (11) is communicated with one end of a drill rig water swivel connecting pipeline (12). The other end of the drill rig water swivel connecting pipeline (12) is communicated with the drill rig water swivel; The oil supply module includes an oil tank (13). An oil tank oil supply pipeline (14) and an oil tank oil return pipeline (15) are connected to the oil tank (13). The oil outlet end of the oil tank oil supply pipeline (14) is connected to the first interface of a master control solenoid valve (16). The second interface of the master control solenoid valve (16) is communicated with the oil inlet end of an oil inlet control pipeline (17) through a pipeline. The third interface of the master control solenoid valve (16) is communicated with the oil outlet end of an oil return control pipeline (18) through a pipeline. The fourth interface of the master control solenoid valve (16) is connected to the oil tank oil return pipeline (15); The first oil passage section of the oil inlet control pipeline (17) is connected to the first interface of the air supply pilot solenoid valve (4). The second interface of the air supply pilot solenoid valve (4) is communicated with the first oil passage end of the air supply hydraulic directional control valve (2) through a pipeline. The second oil passage end of the air supply hydraulic directional control valve (2) is connected to the third interface of the air supply pilot solenoid valve (4) through a pipeline. The fourth interface of the air supply pilot solenoid valve (4) is connected to the first oil return section of the oil return control pipeline (18); The second oil passage section of the oil inlet control pipeline (17) is connected to the first interface of the water supply pilot solenoid valve (7). The second interface of the water supply pilot solenoid valve (7) is communicated with the first oil passage end of the water supply hydraulic directional control valve (6) through a pipeline. The second oil passage end of the water supply hydraulic directional control valve (6) is connected to the third interface of the water supply pilot solenoid valve (7) through a pipeline. The fourth interface of the water supply pilot solenoid valve (7) is connected to the second oil return section of the oil return control pipeline (18); The third oil passage section of the described oil inlet control pipeline (17) is connected to the first interface of the negative pressure pilot solenoid valve (10), and the second interface of the negative pressure pilot solenoid valve (10) is connected to the first oil passage end of the negative pressure hydraulic directional control valve (9) through a pipeline; the second oil passage end of the negative pressure hydraulic directional control valve (9) is connected to the third interface of the negative pressure pilot solenoid valve (10) through a pipeline, and the fourth interface of the negative pressure pilot solenoid valve (10) is connected to the third oil return section of the oil return control pipeline (18).

2. The electro-hydraulic control system for air and water pumping switching underground in coal mines according to claim 1, wherein A wind supply control check valve (19) is provided at the air inlet end of the described wind supply pipeline (1).

3. The electro-hydraulic control system for air and water pumping switching underground in coal mines according to claim 1, wherein A water supply filter (20) is provided at the water inlet end of the described water supply pipeline (5).

4. The air-water pumping switching electro-hydraulic control system for underground coal mines according to claim 1, wherein, A drainage filter (21) is provided on the described drill rig water braid connection pipeline (12).

5. The electro-hydraulic control system for switching between water and air pumping in underground coal mines according to claim 1, characterized in that, A motor pump unit (22) and a pressure reducing valve (23) are provided on the described oil tank oil supply pipeline (14).

6. The electro-hydraulic control system for switching between pneumatic and hydraulic pumping in underground coal mines according to claim 1, wherein, An oil tank filter (24) is provided on the described oil tank oil return pipeline (15).

7. The air-water pumping switching electro-hydraulic control system for underground coal mines according to claim 1, wherein, A wind supply handle (25), a water supply handle (26), and a negative pressure handle (27) are respectively provided on the described wind supply hydraulic directional control valve (2), water supply hydraulic directional control valve (6), and negative pressure hydraulic directional control valve (9).

8. The electro-hydraulic control system for switching between pneumatic and hydraulic pumping in underground coal mines according to claim 1, characterized in that, A wind pressure gauge and a pressure sensor are connected to the described wind supply pipeline (1); a water pressure gauge and a pressure sensor are connected to the described water supply pipeline (5); a negative pressure gauge and a pressure sensor are connected to the described negative pressure pipeline (8).

9. A hydro-pneumatic pumping switching electro-hydraulic control method for underground coal mines, characterized in that, This method uses a remote control system to control the underground coal mine water, wind, and drainage switching electro-hydraulic control system as described in any one of claims 1 to 8; the described remote control system includes a controller, a remote control transmitter, a remote control receiver, and a CAN bus.

10. The electro-hydraulic control method for switching between air and water pumping in underground coal mines according to claim 9, wherein, This method specifically includes the following steps: Step 1.1, remote control / manual operation: When the device is powered on, first energize the master control solenoid valve (16), and the device automatically admits pilot oil. At this time, corresponding electric control operations can be performed through the water, wind, and drainage button switches set by remote control, and the manual operation of the handle fails; after pressing the corresponding button on the remote control transmitter, the master control solenoid valve (16) loses power and the pilot oil is cut off, and only then can the on / off and switching functions of the wind supply hydraulic directional control valve (2), water supply hydraulic directional control valve (6), and negative pressure hydraulic directional control valve (9) be manually realized through the hydraulic valve handle, and at this time the remote control operation fails; Step 1.2, remote control single-action switch operation: When the device is powered on, first energize the master control solenoid valve (16) to make the pilot oil pass. After pressing the corresponding button on the remote control transmitter, the water supply pilot solenoid valve (7) is energized to commutate and admit pilot oil, the water control water supply hydraulic directional control valve (6) opens, and the drill rig is supplied with water; after pressing the corresponding button on the remote control transmitter, the water supply pilot solenoid valve (7) loses power and commutates, and the water control water supply hydraulic directional control valve (6) closes; Step 1.3, fast switching function operation: When the water control water supply hydraulic directional control valve (6) is working, after pressing the corresponding button on the remote control transmitter, the wind supply pilot solenoid valve (4) is energized to commutate, controlling the wind supply hydraulic directional control valve (2) to open, and at the same time the water supply pilot solenoid valve (7) loses power and commutates, and the water control water supply hydraulic directional control valve (6) closes, realizing one-key fast switching between water and wind; Step 1.4, Interlock Function: According to the actual working conditions of drilling, only one of the functions of air supply, water supply and gas drainage can be executed at the same time, that is, the electric control actions of turning on the air, turning on the water and turning on the drainage are interlocked, and two or three of them cannot be turned on at the same time; Step 1.5, Emergency Stop Function: The emergency stop button on the remote control transmitter is used to cut off the power supply of the drilling rig in some emergency situations, which is equivalent to the emergency stop switch function of the drilling rig; Step Two, Control of the Quick Switching Function of the Automatic Trigger Device: Step 2.1, Automatic Switching between Air Drainage and Water Drainage: The set negative pressure sensor monitors that the negative pressure of the extracted gas is T P , when the monitored value T P is greater than the set first-level threshold T P1 , the sensor alarms, indicating that there may be an over-limit situation of gas accumulation due to blockage behind the drill hole. The operator stops drilling for inspection and handling; if when T P is greater than the set second-level threshold T P2 (T P2 >T P1 ), the quick cut function is automatically triggered to handle the accident, that is, the air supply or water supply function is closed, and the negative pressure function is turned on to extract the gas accumulated in the drill hole from the drill pipe to prevent the occurrence of accidents such as hole spraying and drill pipe burying; Step 2.2, Automatic Quick Switching between Water and Air: The set carbon monoxide concentration sensor monitors the CO concentration value. When the monitored value T C is greater than the set first-level threshold T C1 , the sensor alarms, indicating that there may be an accident of the bottom coal seam catching fire caused by the dry friction between the drill bit, drill pipe and the coal seam. The operator stops drilling for inspection and handling; if when T C is greater than the set second-level threshold T C2 (T C2 >T C1 ), the quick-switching function is automatically triggered to handle the accident, that is, the air supply is closed, the water supply is turned on, and the drill rig injects water into the drill hole to extinguish the fire, preventing a more serious fire accident from occurring.

Images