Remote liquid supply system for coal mine

Abstract

The present application provides a kind of coal mine remote liquid supply system, including liquid supply system output automatic regulating subsystem, for the output flow and pressure of liquid supply system are automatically regulated;Long distance pipeline monitoring subsystem, for real-time monitoring the flow, pressure, temperature and leakage of long distance pipeline;Hydraulic support input emulsion distribution subsystem, for the high-pressure emulsion is shunted into multiple independent working face liquid supply circuit;Hydraulic support return liquid subsystem, for collecting hydraulic support return liquid and conveying it back to the return liquid filter station of liquid supply system;The liquid supply system output automatic regulating subsystem, long distance pipeline monitoring subsystem, hydraulic support input emulsion distribution subsystem and hydraulic support return liquid subsystem form liquid supply circuit, to carry out liquid supply regulation to the working face of different liquid supply demand, structure design is reasonable, clear architecture, can realize for several working face simultaneous liquid supply, from the overall system point of view, improve overall liquid supply regulation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining, in particular to a coal mine remote liquid supply system. BACKGROUND

[0002] The coal mine liquid supply system is an integrated system that provides stable and efficient hydraulic power for fully mechanized coal mining faces through remote centralized control. The system usually includes large-flow emulsion pump stations, multi-stage filtration systems, intelligent monitoring and control systems, and other equipment, which can realize real-time monitoring and automatic control of the liquid supply system, thereby improving the stability and safety of the liquid supply. The system is divided into two parts, the emulsion pump provides high-pressure emulsion for the hydraulic support, which is the power source for the action of the hydraulic support; the spray pump provides clean water for the coal mining machine and the hydraulic support for dust spraying. The liquid supply system is usually arranged on the equipment train of the main transport gallery of the working face, and the supply and return liquid pipes are directly connected to the hydraulic support of the coal mining face. The traditional coal mine liquid supply mode usually refers to the arrangement of the liquid supply system in the crossheading tunnel near the fully mechanized working face. The liquid supply system directly delivers emulsion and clean water to the hydraulic support and other equipment through high-pressure rubber pipes. As the working face advances, the liquid supply system train needs to move synchronously with the working face. In order to reduce the movement of the liquid supply system equipment train, reduce the amount of roadway development, and reduce the overall construction and maintenance costs, the coal mine remote liquid supply mode is adopted in related technologies. The coal mine remote liquid supply mode is to arrange the liquid supply system in a location away from the fully mechanized working face, such as on the ground surface, in an independent auxiliary roadway, or in a fixed chamber. The liquid supply system supplies liquid to the fully mechanized working face through long-distance pipelines. This mode does not need to arrange emulsion pumps, spray pumps, and other equipment on the traditional equipment train, thereby reducing the overall weight and space occupied by the equipment train, reducing the labor intensity during movement of the equipment train, and providing more space for roadway ventilation and pedestrians. However, the existing remote liquid supply system is improved for specific working faces and does not have universality for working scenes with multiple working faces. It cannot adjust the liquid supply from the overall system perspective, affecting the overall liquid supply effect. SUMMARY

[0003] The present application provides a coal mine remote liquid supply system to solve the problem that the traditional coal mine remote liquid supply system is not designed from the overall system perspective, making it difficult to achieve overall liquid supply adjustment.

[0004] The present application provides a coal mine remote liquid supply system, comprising:

[0005] The liquid supply system output automatic adjustment subsystem is used for automatically adjusting the output flow and pressure of the liquid supply system;

[0006] The long-distance pipeline monitoring subsystem is used for real-time monitoring of the flow, pressure, temperature, and leakage of the long-distance pipeline;

[0007] The hydraulic support input emulsion distribution subsystem is used for distributing high-pressure emulsion into multiple independent working face liquid supply circuits.

[0008] The hydraulic support return liquid subsystem is used for collecting hydraulic support return liquid and delivering the return liquid to a return liquid filter station of the liquid supply system.

[0009] The liquid supply system output automatic adjustment subsystem, the long-distance pipeline monitoring subsystem, the hydraulic support input emulsion distribution subsystem and the hydraulic support return liquid subsystem form a liquid supply circuit to adjust liquid supply of different working faces with different liquid supply requirements.

[0010] The coal mine long-distance liquid supply system provided by the application further comprises a long-distance pipeline protection subsystem, and the long-distance pipeline protection subsystem comprises:

[0011] The slow closing check valve is used for preventing medium in the pipeline from flowing backward.

[0012] The overpressure relief valve is used for automatically opening to release when the pressure at a certain point in the pipeline system exceeds a set value.

[0013] The pressure regulating tower is used for discharging high-pressure water flow when the water hammer pressure is higher than a preset high-pressure threshold value and opening the one-way plate to inject water into the pipeline when the water hammer pressure is lower than a preset low-pressure threshold value.

[0014] The electrically-controlled gate valve is used for controlling opening and closing of the pipeline.

[0015] The coal mine long-distance liquid supply system provided by the application, the liquid supply system output automatic adjustment subsystem comprises:

[0016] The pump station pressure-dependent start-stop control module is used for controlling start or stop of the pump station according to a comparison result of the actual output pressure and the preset target value.

[0017] The variable-frequency speed-regulating pressure-regulating control module is used for adjusting the variable-frequency converter output frequency to change the pump station motor speed based on a PID control algorithm.

[0018] The step pressure difference pressure boosting and unloading switching control module is used for switching working states between the pump stations based on preset pressure boosting values and unloading values of the pump stations.

[0019] The coal mine long-distance liquid supply system provided by the application, the long-distance pipeline monitoring subsystem comprises:

[0020] A data acquisition module is configured to acquire liquid supply management state data, and the data acquisition module comprises a flow sensor, a pressure sensor, a temperature sensor and a liquid leakage sensor, the flow sensor is configured to monitor the liquid inflow and outflow of the entire long-distance pipeline, the pressure sensor is configured to monitor the pressure of the liquid in the pipeline in sections, the temperature sensor is configured to monitor the temperature of the liquid in the pipeline in sections, and the liquid leakage sensor is configured to monitor whether there is leakage in the pipeline in sections.

[0021] A transmission module comprises a wireless transmitter and a receiver arranged in sections, and is configured to transmit the liquid supply management state data collected by the sensors to the monitoring center.

[0022] A controller is configured to receive instruction data sent by the monitoring center and send corresponding instructions to an execution unit.

[0023] The execution unit is configured to perform corresponding actions according to the instructions sent by the controller.

[0024] The coal mine long-distance liquid supply system provided by the present application comprises:

[0025] A flow dividing valve is configured to divide the emulsion output by the liquid supply system according to the number of working faces.

[0026] A one-way valve is configured to control the flow direction of the emulsion and prevent backflow.

[0027] An on-off stop valve is configured to remotely control the on-off of the corresponding liquid delivery path.

[0028] An electromagnetic unloading valve is configured to adjust the boost value and unloading value according to the feedback result of the working face system pressure monitoring value.

[0029] The coal mine long-distance liquid supply system provided by the present application comprises:

[0030] A liquid return storage tank is configured to temporarily store the liquid returned by the hydraulic support.

[0031] A liquid return power pump is configured to deliver the returned liquid to the one-way valve.

[0032] A flow combining valve is configured to combine the returned liquid from different working faces and return the combined liquid to the liquid return filtering station.

[0033] The present application also provides a coal mine long-distance liquid supply method, which is applicable to the coal mine long-distance liquid supply system described in any one of the above embodiments, and comprises the following steps:

[0034] The liquid supply circuit is established to adjust the liquid supply of different working faces on the liquid supply circuit, and the liquid supply circuit comprises a liquid supply system output automatic adjustment subsystem, a long-distance pipeline monitoring subsystem, a hydraulic support input emulsion distribution subsystem and a hydraulic support liquid return subsystem;

[0035] The liquid supply of different working faces on the liquid supply circuit is adjusted, and the adjustment comprises:

[0036] The output automatic adjustment subsystem is used to automatically adjust the flow and pressure of the liquid supply system, and the working state of the pump station is adjusted according to the actual demand.

[0037] The long-distance pipeline monitoring subsystem is used to monitor the flow, pressure, temperature and leakage in the pipeline in real time, and the monitoring data is sent to the monitoring center.

[0038] The hydraulic support input emulsion distribution subsystem is used to distribute the high-pressure emulsion into multiple independent working face liquid supply circuits.

[0039] The hydraulic support liquid return is collected and delivered back to the liquid return filter station of the liquid supply system.

[0040] According to the coal mine long-distance liquid supply method provided by the application, the output automatic adjustment subsystem is used to automatically adjust the flow and pressure of the liquid supply system, and the working state of the pump station is adjusted according to the actual demand.

[0041] The pump station is started or stopped according to the comparison result of the actual output pressure in the set time and the preset target value.

[0042] And / or,

[0043] Variable frequency speed regulation and pressure regulation control: according to the comparison of the actual output pressure and the pressure reference value preset by the frequency converter, the output frequency of the frequency converter is adjusted by the PID control algorithm to change the motor speed.

[0044] And / or,

[0045] According to the boost value and the unloading value set for different pump stations, the state of the unloading valve is switched when the electromagnet is powered on or powered off, so as to control the working mode of each pump station.

[0046] According to the coal mine long-distance liquid supply method provided by the application, the hydraulic support input emulsion distribution subsystem is used to distribute the high-pressure emulsion into multiple independent working face liquid supply circuits, and the distribution comprises:

[0047] The emulsion output by the liquid supply system is distributed into multiple paths through the distribution valve according to the number of working faces.

[0048] The working face system pressure of each path is monitored, and the boost value and the unloading value of the electromagnetic unloading valve are adjusted according to the working face system pressure monitoring value.

[0049] The coal mine long-distance liquid supply method provided by the application, the hydraulic support back liquid collecting and conveying back liquid filter station of the liquid supply system comprises:

[0050] The hydraulic support back liquid of three working faces is injected into the respective back liquid storage tank, and the liquid level of the storage tank is monitored in real time;

[0051] When the liquid level reaches the high limit value, the back liquid power pump is started to convey the back liquid to the one-way valve, and finally returns to the back liquid filter station of the liquid supply system through the combined valve.

[0052] The coal mine long-distance liquid supply system provided by the application comprises a liquid supply system output automatic adjustment subsystem for automatically adjusting the output flow and pressure of the liquid supply system; a long-distance pipeline monitoring subsystem for monitoring the flow, pressure, temperature and leakage of the long-distance pipeline in real time; a hydraulic support input emulsion distribution subsystem for splitting the high-pressure emulsion into a plurality of independent working face liquid supply circuits; a hydraulic support back liquid subsystem for collecting the hydraulic support back liquid and conveying it back to the back liquid filter station of the liquid supply system; the liquid supply system output automatic adjustment subsystem, the long-distance pipeline monitoring subsystem, the hydraulic support input emulsion distribution subsystem and the hydraulic support back liquid subsystem form a liquid supply circuit to adjust the liquid supply of different working faces with different liquid supply requirements on the liquid supply circuit, and the liquid supply adjustment is performed in a modular division mode of liquid supply, transmission, distribution and recovery, which has a reasonable structure, clear architecture, can realize simultaneous liquid supply for several working faces, is designed from the overall system perspective, and improves the overall liquid supply adjustment effect. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0054] Figure 1 is a structural schematic diagram of the coal mine long-distance liquid supply system provided by the embodiment of the application;

[0055] Figure 2 is a structural schematic diagram of the pump station pressure starting and stopping control module provided by the embodiment of the application;

[0056] Figure 3 is a structural schematic diagram of the frequency conversion speed regulation and pressure regulation control module provided by the embodiment of the application;

[0057] Figure 4 is a structural schematic diagram of the step pressure difference pressure boosting and unloading switching control module provided by the embodiment of the application;

[0058] Figure 5 is a long-distance pipeline monitoring subsystem structure schematic diagram provided by an embodiment of the present application;

[0059] Figure 6 is a long-distance pipeline protection subsystem structure schematic diagram provided by an embodiment of the present application;

[0060] Figure 7 is a hydraulic support input emulsion distribution subsystem structure schematic diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0062] Figure 1 A structure diagram of a coal mine long-distance liquid supply system is provided by an embodiment of the present application, and the coal mine long-distance liquid supply system comprises:

[0063] A liquid supply system output automatic adjustment subsystem is configured to automatically adjust the output flow and pressure of the liquid supply system.

[0064] A long-distance pipeline monitoring subsystem is configured to monitor the flow, pressure, temperature and leakage of the long-distance pipeline in real time.

[0065] A hydraulic support input emulsion distribution subsystem is configured to distribute high-pressure emulsion into multiple independent working face liquid supply circuits.

[0066] A hydraulic support liquid return subsystem is configured to collect hydraulic support return liquid and deliver it back to the liquid return filter station of the liquid supply system.

[0067] The liquid supply system output automatic adjustment subsystem, the long-distance pipeline monitoring subsystem, the hydraulic support input emulsion distribution subsystem and the hydraulic support liquid return subsystem form a liquid supply circuit to adjust the liquid supply of different working faces with different liquid supply requirements on the liquid supply circuit.

[0068] In an embodiment of the present application, the coal mine long-distance liquid supply system further comprises a long-distance pipeline protection subsystem configured to protect the long-distance pipeline.

[0069] Traditional long-distance liquid supply systems are improved for specific working faces and are not universal for working scenes with multiple working faces, and cannot adjust the liquid supply from the overall system perspective, which affects the overall liquid supply effect.

[0070] The coal mine long-distance liquid supply system provided in this invention includes an automatic adjustment subsystem for the output of the liquid supply system, used to automatically adjust the output flow and pressure of the liquid supply system; a long-distance pipeline monitoring subsystem, used to monitor the flow, pressure, temperature and leakage of the long-distance pipeline in real time; a hydraulic support input emulsion distribution subsystem, used to divert the high-pressure emulsion into multiple independent working face liquid supply circuits; and a hydraulic support return liquid subsystem, used to collect the hydraulic support return liquid and transport it back to the return liquid filtration station of the liquid supply system. The automatic adjustment subsystem for the output of the liquid supply system, the long-distance pipeline monitoring subsystem, the hydraulic support input emulsion distribution subsystem, and the hydraulic support return liquid subsystem constitute the liquid supply circuit, which adjusts the liquid supply to working faces with different liquid supply needs on the liquid supply circuit. The liquid supply adjustment is carried out in a modular way according to the liquid supply, liquid transmission, liquid distribution and liquid recovery, with a reasonable structure and clear architecture. It can realize the simultaneous liquid supply to several working faces. The design from the perspective of the whole system improves the overall liquid supply adjustment effect.

[0071] Based on any of the above embodiments, the automatic adjustment subsystem for the liquid supply system output includes:

[0072] The pump station pressure-following start / stop control module is used to control the start or stop of the pump station based on the comparison result between the actual output pressure and the preset target value.

[0073] In this embodiment of the invention, when the actual output pressure is continuously lower than a preset first target value within a set time T, a pump station is started and the system increases the flow rate of the pump station accordingly; when the actual output pressure is continuously higher than a preset second target value within a set time T, a pump station is shut down and the system decreases the flow rate of the pump station accordingly.

[0074] like Figure 2 As shown, the CPU in the controller of the automatic adjustment subsystem of the liquid supply system determines the number of pump stations to be activated based on the comparison between the actual output pressure of the system within a set time T and the preset pressure target value. Then, according to the required number of pump stations to be activated, the CPU activates / deactivates relays 1# to 4# in the controller respectively. The relays control the 1# to 4# contactors of the combination switch to activate / deactivate. After the contactors are activated, the motors of the corresponding 1# to 4# pump stations start / stop.

[0075] In this embodiment of the invention, the automatic adjustment subsystem of the liquid supply system further includes a variable frequency speed regulation and pressure regulation control module, which is used to adjust the output frequency of the frequency converter based on the PID control algorithm to change the speed of the pump station motor.

[0076] In the embodiment of the present application, when the actual output pressure is lower than the reference pressure target value of the frequency converter, the output frequency of the frequency converter is increased through the PID control algorithm, so as to increase the motor rotating speed and the output flow of the pump station; when the actual output pressure is higher than the reference pressure target value of the frequency converter, the output frequency of the frequency converter is decreased through the PID control algorithm, so as to decrease the motor rotating speed and the output flow of the pump station.

[0077] As shown in Figure 3 The CPU in the controller of the output automatic regulating subsystem of the liquid supply system determines the output frequency of the 1#-4# frequency converters of each pump station according to the comparison between the actual output pressure of the liquid supply system and the preset pressure reference value of the frequency converter, controls the real-time rotating speed of the 1#-4# motors, and thus adjusts the real-time output flow of each pump station.

[0078] In the embodiment of the present application, the output automatic regulating subsystem of the liquid supply system further comprises a stepped pressure difference boosting and unloading switching control module, which is used for switching the working state between the pump stations based on the preset boosting value and unloading value of each pump station.

[0079] Each pump station is equipped with an unloading valve, which is controlled by an electromagnet and can be switched to a boosting state or an unloading state. When the electromagnet is powered on, the unloading valve is in the boosting state; when the electromagnet is powered off, the unloading valve is in the unloading state. Each pump can be independently set with a boosting value and an unloading value, and the controller of the output automatic regulating subsystem of the liquid supply system controls the attraction state of the electromagnet according to the set boosting value and unloading value, so as to switch the boosting / unloading state of the unloading valve.

[0080] The boosting value and unloading value of each pump station are set to a stepped difference state. Taking three emulsion pump stations as an example, the boosting and unloading values of the three pump stations from high to low are as follows: the unloading upper limit value PU1 of the 1# pump, the unloading upper limit value PU2 of the 2# pump, the boosting lower limit value PL1 of the 1# pump, the unloading upper limit value PU3 of the 3# pump, the boosting lower limit value PL2 of the 2# pump, and the boosting lower limit value PL3 of the 3# pump.

[0081] As shown in Figure 4 As shown in the system pressure curve, the system pressure starts to rise from the lowest point. When the system pressure rises to ① or below, i.e., lower than the boosting lower limit value of the 3# pump, all the three pumps in the system are in the boosting state.

[0082] When the system pressure rises to ① or above, i.e., higher than the boosting lower limit value of the 3# pump, all the three pumps in the system are in the boosting state.

[0083] When the system pressure rises to ② or above, i.e., higher than the boosting lower limit value of the 2# pump, all the three pumps in the system are in the boosting state.

[0084] When the system pressure rises above ③, i.e. exceeds the 3# pump unloading upper limit value, the 3# pump in the system switches to the unloading state, and the 1# pump and the 2# pump are in the pressurizing state; that is, one pump is unloaded, and two pumps are pressurized.

[0085] When the system pressure rises above ④, i.e. exceeds the 1# pump pressurizing lower limit value, the 3# pump in the system is still in the unloading state, and the 1# pump and the 2# pump are in the pressurizing state.

[0086] When the system pressure rises above ⑤, i.e. exceeds the 2# pump unloading upper limit value, the 2# pump in the system switches to the unloading state, the 3# pump is still in the unloading state, and the 1# pump is in the pressurizing state; that is, two pumps are unloaded, and one pump is pressurized.

[0087] When the system pressure rises above ⑥, i.e. exceeds the 1# pump unloading upper limit value, the 1# pump in the system switches to the unloading state, and the 2# pump and the 3# pump are still in the unloading state; that is, three pumps are unloaded.

[0088] When the system pressure drops below ⑦, i.e. is lower than the 1# pump unloading upper limit value, the 1# pump, the 2# pump and the 3# pump in the system are still in the unloading state; that is, three pumps are unloaded.

[0089] When the system pressure drops below ⑧, i.e. is lower than the 2# pump unloading upper limit value, the 1# pump, the 2# pump and the 3# pump in the system are still in the unloading state; that is, three pumps are unloaded.

[0090] When the system pressure drops below ⑨, i.e. is lower than the 1# pump pressurizing lower limit value, the 1# pump in the system switches to the pressurizing state, and the 2# pump and the 3# pump are still in the unloading state; that is, one pump is pressurized, and two pumps are unloaded.

[0091] When the system pressure drops below ⑩, i.e. is lower than the 3# pump unloading upper limit value, the 1# pump in the system is still in the pressurizing state, and the 2# pump and the 3# pump are still in the unloading state; that is, one pump is pressurized, and two pumps are unloaded.

[0092] When the system pressure drops below ⑪, i.e. is lower than the 2# pump pressurizing lower limit value, the 2# pump in the system switches to the pressurizing state, the 1# pump remains in the pressurizing state, and the 3# pump is still in the unloading state; that is, two pumps are pressurized, and one pump is unloaded.

[0093] When the system pressure drops below ⑫, i.e. is lower than the 3# pump pressurizing lower limit value, the 3# pump in the system switches to the pressurizing state, and the 1# pump and the 2# pump remain in the pressurizing state; that is, three pumps are pressurized.

[0094] Thus, one cycle of system pressure from the lowest to the highest, and then from the highest to the lowest is completed.

[0095] The traditional liquid supply regulating system only has a single feedback control of pressure monitoring, and the embodiment of the present application automatically adjusts the output flow and pressure of the liquid supply system through the combination of three methods of following pressure start-stop control, frequency conversion speed regulation pressure control and step pressure difference switching control, so that good regulating effect of the overall output pressure of the liquid supply system is realized.

[0096] Based on any of the above embodiments, the long-distance pipeline monitoring subsystem comprises:

[0097] A data acquisition module is configured to acquire liquid supply management state data, and the data acquisition module comprises a flow sensor, a pressure sensor, a temperature sensor and a liquid leakage sensor. The flow sensor is configured to monitor the liquid inflow and outflow of the entire long-distance pipeline. The pressure sensor is configured to monitor the pressure of the liquid in the pipeline in segments. The temperature sensor is configured to monitor the temperature of the liquid in the pipeline in segments. The liquid leakage sensor is configured to monitor whether there is leakage in the pipeline in segments.

[0098] A transmission module is configured to transmit the liquid supply management state data acquired by the sensors to the monitoring center.

[0099] A controller is configured to receive instruction data sent by the monitoring center and send corresponding instructions to an execution unit.

[0100] The execution unit is configured to perform corresponding actions according to the instructions sent by the controller.

[0101] In the embodiment of the present application, one flow meter is installed at the liquid inflow end of the entire long-distance liquid supply pipeline to monitor the liquid inflow of the entire long-distance pipeline.

[0102] As shown in Figure 5 The long-distance pipeline is divided into a 200-meter unit, and there is a special pipeline every 200 meters. The special pipeline is installed with a pressure sensor and a temperature sensor. The pressure sensor is configured to monitor the real-time pressure of the liquid in the pipeline. The temperature sensor is configured to monitor the real-time temperature of the liquid in the pipeline. The pressure and temperature of each special pipeline are collected on a display interface. When the pressure of a certain segment is abnormal, an alarm information is sent to indicate that there may be a leakage in the pipeline, prompting the staff to check the situation on site.

[0103] About 33 pipes of 6 meters long are needed for each 200 meters length. One set of liquid leakage sensor is installed at the joint of each 6-meter-long pipe, one wireless transmitter is installed at each liquid leakage sensor, one wireless receiver and one controller are installed every 200 meters. The liquid leakage sensor is used to monitor whether there is liquid leakage at the joint between each 6-meter-long pipe. The liquid leakage signals of all liquid leakage sensors are sent to the corresponding wireless transmitter near each liquid leakage sensor. Each wireless transmitter sends signals to the wireless receiver arranged every 200 meters through Bluetooth signals. The wireless receiver sends signals to the corresponding controller near the wireless receiver. One controller is arranged every 200 meters, and the controllers are connected through communication cables.

[0104] Based on any of the above embodiments, the long-distance pipeline protection subsystem comprises:

[0105] A slow closing check valve is used to prevent the medium in the pipeline from flowing backward.

[0106] An overpressure relief valve is used to automatically open to release flow when the pressure at a certain point in the pipeline system exceeds the set value.

[0107] A pressure regulating tower is used to discharge high-pressure water flow when the water hammer pressure is higher than the preset high-pressure threshold, and to open the one-way plate to inject water into the pipeline when the water hammer pressure is lower than the preset low-pressure threshold.

[0108] An electrically controlled gate valve is used to control the opening and closing of the pipeline.

[0109] As shown in Figure 6 , the liquid supply system leads out three groups of pipelines. One group of pipelines is the emulsion liquid supply pipeline, the liquid flow direction is from the liquid supply system to the hydraulic support. One group of pipelines is the emulsion liquid return pipeline, the liquid flow direction is from the hydraulic support to the liquid supply system. One group of pipelines is the spray water supply pipeline, the liquid flow direction is from the liquid supply system to the coal mining machine.

[0110] The slow closing check valve is used to prevent the medium in the pipeline from flowing backward. The opening and closing member is opened or closed by the medium flow and force, only allowing the medium to flow in one direction, preventing accidents. The electromagnetic flowmeter installed on the pipeline monitors the liquid flow direction in the pipeline in real time. When the liquid flows in the opposite direction, the slow closing check valve is closed to prevent the liquid from flowing backward.

[0111] When the pressure at a certain point in the pipeline system exceeds the set pressure, the overpressure relief valve at the point automatically opens to release a certain flow, keeping the pressure at the point stable. When the pressure drops to a safe value, the overpressure relief valve automatically closes. The pressure sensor installed on the pipeline monitors the liquid pressure in the pipeline in real time. When the liquid pressure exceeds the safe predetermined value, the overpressure relief valve is opened to prevent the pipeline pressure from being too high.

[0112] The box type bidirectional pressure regulating tower is an effective measure for preventing excessively low pressure drop and water column separation or controlling flow cut-off water hammer. When the water hammer pressure in the pipeline is increased, the box type bidirectional pressure regulating tower is started to allow high-pressure water flow to be quickly discharged from the pipeline, and has the function of timely water and pressure relief, and when the pipeline pressure is low or negative pressure occurs, the one-way plate can be opened in time to inject water into the pipeline to prevent the pipeline from appearing flow cut-off water hammer.

[0113] The above protection device is equipped with a communication module, the pipeline monitoring device and the pipeline protection device are connected into a whole through bus communication, and the device information is uploaded to an integrated monitoring interface for long-distance pipeline overall monitoring.

[0114] The traditional monitoring system adopts a wired monitoring mode, the device and wiring cost are high, and faults such as disconnection are prone to occur, and it is not as simple, safe and reliable as wireless wiring. The prior art does not connect the whole pipeline monitoring and protection device into a whole system, and lacks overall monitoring and protection. The long-distance pipeline monitoring and protection subsystem in the embodiment of the application can monitor the flow, pressure and leakage of the long-distance pipeline in real time, adopts a pipeline joint leakage monitoring system combining wireless and wired connection, effectively reduces the equipment cost, improves the maintainability and stability. The protection measures of the slow-closing check valve, the overpressure relief valve, the pressure regulating tower and the electric control gate valve are adopted for the long-distance pipeline, and various harmfulness of long-distance high-pressure water conveying pipelines such as pump starting water hammer, valve closing water hammer and pump stopping water hammer is effectively prevented.

[0115] Based on any one of the above embodiments, the hydraulic support input emulsion distribution subsystem comprises:

[0116] A flow divider is used for distributing the emulsion output by the liquid supply system according to the number of working faces;

[0117] A check valve is used for controlling the emulsion flow direction and preventing backflow;

[0118] A on-off stop valve is used for remotely controlling the on-off of the corresponding liquid conveying path;

[0119] An electromagnetic unloading valve is used for adjusting the boost value and unloading value according to the feedback result of the working face system pressure monitoring value.

[0120] A centralized liquid supply mode is adopted, and one set of liquid supply system is used for supplying liquid and water to three working faces.

[0121] As Figure 7As shown, the left side is the emulsion liquid supply distribution module, the emulsion liquid is output from the liquid supply system to the flow divider, the flow divider divides the emulsion liquid output from the liquid supply system into three ways according to the number of working faces, each way first passes through a check valve, the function of the check valve is to control the emulsion liquid to flow from the liquid supply system to the working face only, to prevent the occurrence of reverse flow phenomenon; the emulsion liquid passes through the check valve and then passes through the on-off stop valve, the function of the on-off stop valve is that the on-off of the liquid path can be controlled by remote electric control; the emulsion liquid passes through the electromagnetic unloading valve after passing through the on-off stop valve, the function of the electromagnetic unloading valve is that the boost value and the unloading value can be set by the control system, and the boost value and the unloading value are automatically adjusted according to the feedback result of the working face system pressure monitoring value. The emulsion liquid flowing out of the electromagnetic unloading valve is respectively transported to 3 working faces. Through the emulsion liquid supply distribution module, the high-pressure emulsion liquid output from the centralized liquid supply system is divided into three independent liquid paths, the three liquid paths do not interfere with each other, the electromagnetic unloading valve can be set to different output pressures, and the liquid supply of working faces with different pressures is provided; when the electromagnetic unloading valve is in the unloading state, the on-off stop valve is adjusted to the cut-off state through the control system, so that the output pressures of the three liquid paths do not interfere with each other.

[0122] Figure 7 The right side is the spray water distribution module, the principle is consistent with the left side, the difference is that the electromagnetic unloading valve is replaced by a relief valve, the relief valve is only set with a relief value, and the relief valve is overflowed when the value is exceeded, so as to control the spray system to maintain a stable pressure.

[0123] The emulsion liquid supply, return and spray water supply distribution subsystem: the emulsion liquid supply, return and spray water supply are designed separately to form three subsystems, the emulsion liquid supply is independently designed in a single liquid path, and the supply of working faces with a number greater than 3 is realized by the combination control of multiple valves to realize the supply of working faces with different pressures. The proposal realizes a centralized liquid supply system, which can provide differential liquid supply pressure for more than three working faces in the same mining area.

[0124] Figure 7 The middle part is the hydraulic support return liquid subsystem, which includes:

[0125] The return liquid storage tank is used for temporarily storing the return liquid of the hydraulic support;

[0126] The return liquid power pump is used for conveying the return liquid to the check valve;

[0127] The confluence valve is used for collecting the return liquid from different working faces and returning to the return liquid filtering station.

[0128] 3 working faces inject hydraulic support return liquid into the return liquid storage tank, temporarily store the hydraulic support return liquid in the return liquid storage tank, monitor the liquid level of the return liquid storage tank in real time, open the return liquid power pump when the liquid level exceeds the high limit value, transport the return liquid to the one-way valve, three one-way valves are finally collected to the combined valve, and finally the hydraulic support return liquid is rotated to the return liquid filtering station of the liquid supply system through the combined valve, and after filtering through the return liquid filtering station, the return liquid is returned to the return liquid tank, and the return liquid is recycled.

[0129] The traditional liquid supply system does not realize simultaneous liquid supply for different working faces and different working pressures.

[0130] The embodiment of the present application provides a system-level scheme for long-distance and multi-working face centralized liquid supply, performs system structure design in accordance with a modular division mode of liquid supply, liquid transmission, liquid distribution and liquid recovery, and combines pressure feedback control, frequency conversion speed control and step pressure difference unloading control in automatic adjustment of liquid supply output, combines a plurality of pump stations into a virtual total pump for use, and plays a role of the whole equipment. Real-time monitoring of long-distance pipelines is performed through flow sensors, pressure sensors, temperature sensors and liquid leakage sensors, dynamic protection of long-distance pipelines is realized through slow-closing check valves, overpressure relief valves, pressure regulating towers and electrically controlled gate valves, centralized panel area liquid supply architecture for simultaneous liquid supply to multiple working faces is designed, separate liquid supply circuits for different working faces are realized through combined control of multiple valves, and the flow and pressure requirements of different working faces are met.

[0131] The embodiment of the present application also provides a coal mine long-distance liquid supply method, comprising:

[0132] A liquid supply circuit is established to adjust the liquid supply of working faces with different liquid supply requirements on the liquid supply circuit, the liquid supply circuit comprises a liquid supply system output automatic adjustment subsystem, a long-distance pipeline monitoring subsystem, a hydraulic support input emulsion distribution subsystem and a hydraulic support return liquid subsystem;

[0133] Adjusting the liquid supply of working faces with different liquid supply requirements on the liquid supply circuit comprises:

[0134] The output automatic adjustment subsystem is used for automatically adjusting the flow and pressure of the liquid supply system, and adjusting the working state of the pump station according to actual requirements;

[0135] The long-distance pipeline monitoring subsystem is used for monitoring the flow, pressure, temperature and leakage in the pipeline in real time, and sending the monitoring data to a monitoring center;

[0136] The hydraulic support input emulsion distribution subsystem is used for distributing high-pressure emulsion into a plurality of independent working face liquid supply circuits;

[0137] Hydraulic support return liquid is collected and transported back to the return liquid filtering station of the liquid supply system.

[0138] In the embodiment of the present application, the flow and pressure of the liquid supply system are automatically adjusted by the output automatic adjustment subsystem, and the working state of the pump station is adjusted according to actual demand, including:

[0139] Starting or stopping the pump station according to the comparison result of the actual output pressure in the set time and the preset target value;

[0140] And / or,

[0141] Variable frequency speed regulation and pressure regulation control: according to the comparison of the actual output pressure and the pressure reference value preset by the frequency converter, the output frequency of the frequency converter is adjusted by the PID control algorithm to change the motor speed;

[0142] And / or,

[0143] According to the boost value and the unloading value set for different pump stations, the state of the unloading valve is switched when the electromagnet is powered on or powered off, so as to control the working mode of each pump station.

[0144] In the embodiment of the present application, the hydraulic support input emulsion distribution subsystem divides the high-pressure emulsion into multiple independent working face liquid supply circuits, including:

[0145] The emulsion output by the liquid supply system is divided into multiple paths through the shunt valve according to the number of working faces;

[0146] The working face system pressure of each path is monitored, and the boost value and the unloading value of the electromagnetic unloading valve are adjusted according to the working face system pressure monitoring value.

[0147] In the embodiment of the present application, the liquid return filter station for collecting the hydraulic support return liquid and conveying it back to the liquid supply system includes:

[0148] The hydraulic support return liquid of the three working faces is injected into the respective return liquid storage tank, and the liquid level of the storage tank is monitored in real time;

[0149] When the liquid level reaches the high limit value, the return liquid power pump is started to convey the return liquid to the one-way valve, and finally returns to the liquid return filter station of the liquid supply system through the confluence valve.

[0150] The coal mine remote liquid supply method provided by the embodiment of the present application comprises the following steps: establishing a liquid supply circuit to supply liquid to different working faces with different liquid supply requirements on the liquid supply circuit, wherein the liquid supply circuit comprises an output automatic adjustment subsystem of a liquid supply system, a long-distance pipeline monitoring subsystem, an input emulsion distribution subsystem of a hydraulic support, and a hydraulic support liquid return subsystem; the liquid supply adjustment to the different working faces with different liquid supply requirements on the liquid supply circuit comprises: automatically adjusting the flow and pressure of the liquid supply system through the output automatic adjustment subsystem, and adjusting the working state of the pump station according to the actual requirement; monitoring the flow, pressure, temperature and leakage in the pipeline in real time by using the long-distance pipeline monitoring subsystem, and sending the monitoring data to the monitoring center; distributing the high-pressure emulsion into a plurality of independent working face liquid supply circuits by using the input emulsion distribution subsystem of the hydraulic support; collecting the hydraulic support liquid return and conveying it back to the liquid return filter station of the liquid supply system, and performing the liquid supply adjustment in a modular division mode of liquid supply, transmission, distribution and recovery, so that the structure is reasonable, the architecture is clear, the simultaneous liquid supply for a plurality of working faces can be realized, the design is made from the overall system perspective, and the overall liquid supply adjustment effect is improved.

[0151] The device embodiments described above are merely illustrative, wherein the units illustrated as separate components can or can not be physically separated, and the components illustrated as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the present embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0152] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and necessary general hardware platforms, and of course, can also be realized by hardware. Based on such understanding, the above technical solutions or the part that contributes to the related art can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0153] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A remote liquid supply system for a coal mine, characterised in that, The system comprises: an output automatic adjustment subsystem of the liquid supply system, configured to automatically adjust the output flow and pressure of the liquid supply system; the output automatic adjustment subsystem of the liquid supply system comprises: a pump station pressure-dependent start-stop control module, configured to control the start or stop of the pump station according to a comparison result of the actual output pressure and the preset target value; a frequency conversion speed regulation and pressure regulation control module, configured to adjust the output frequency of the frequency converter to change the motor speed of the pump station based on a PID control algorithm; a stepped pressure difference pressure boosting and unloading switching control module, configured to switch the working states of the pump stations based on the preset pressure boosting values and unloading values of the pump stations; each pump station is equipped with an unloading valve controlled by an electromagnet, which can be switched to a pressure boosting state or an unloading state; when the electromagnet is powered on, the unloading valve is in the pressure boosting state; when the electromagnet is powered off, the unloading valve is in the unloading state; each pump can be independently set with a pressure boosting value and an unloading value; the controller of the output automatic adjustment subsystem of the liquid supply system controls the attraction state of the electromagnet according to the set pressure boosting value and unloading value, so as to switch the pressure boosting / unloading state of the unloading valve; the pressure boosting value and the unloading value of each pump station are set to be in a stepped difference state; a long-distance pipeline monitoring subsystem, configured to monitor the flow, pressure, temperature and leakage of the long-distance pipeline in real time; an input emulsion distribution subsystem of the hydraulic support, configured to split the high-pressure emulsion into multiple independent working face liquid supply circuits; a hydraulic support return liquid subsystem, configured to collect the return liquid of the hydraulic support and deliver the return liquid to the return liquid filter station of the liquid supply system; the output automatic adjustment subsystem of the liquid supply system, the long-distance pipeline monitoring subsystem, the input emulsion distribution subsystem of the hydraulic support and the hydraulic support return liquid subsystem form a liquid supply circuit, so as to adjust the liquid supply of different working faces with different liquid supply requirements on the liquid supply circuit.

2. The remote coal mine liquid supply system of claim 1, wherein, Further comprising: a long-distance pipeline protection subsystem, the long-distance pipeline protection subsystem comprising: a slow-close check valve, configured to prevent the backflow of the medium in the pipeline; an overpressure relief valve, configured to automatically open to release the flow when the pressure at a certain point in the pipeline system exceeds the set value; a pressure regulating tower, configured to discharge high-pressure water flow when the water hammer pressure is higher than the preset high-pressure threshold, and open the one-way plate to inject water into the pipeline when the water hammer pressure is lower than the preset low-pressure threshold; an electrically controlled gate valve, configured to control the opening and closing of the pipeline.

3. The remote coal mine liquid supply system of claim 1, wherein, The long-distance pipeline monitoring subsystem comprises: a data acquisition module, configured to acquire liquid supply management state data, the data acquisition module comprising a flow sensor, a pressure sensor, a temperature sensor and a liquid leakage sensor; the flow sensor is configured to monitor the liquid inflow and outflow of the entire long-distance pipeline; the pressure sensor is configured to monitor the pressure of the liquid in the pipeline in sections; the temperature sensor is configured to monitor the temperature of the liquid in the pipeline in sections; and the liquid leakage sensor is configured to monitor whether there is leakage in the pipeline in sections; a transmission module, the transmission module comprising sectionally arranged wireless transmitters and receivers, configured to transmit the liquid supply management state data acquired by the sensors to a monitoring center; a controller, configured to receive instruction data sent by the monitoring center and send corresponding instructions to an execution unit; an execution unit, configured to perform corresponding actions according to the instructions sent by the controller.

4. The remote coal mine liquid supply system of claim 1, wherein, The input emulsion distribution subsystem of the hydraulic support comprises: A shunt valve is used to distribute the emulsion output by the liquid supply system according to the number of working faces; A check valve is used to control the flow direction of the emulsion and prevent backflow; An on-off stop valve is used to remotely control the on-off of the corresponding liquid delivery circuit; An electromagnetic unloading valve is used to adjust the boost value and unloading value according to the feedback of the working face system pressure monitoring value.

5. The remote coal mine liquid supply system of claim 4, wherein, The hydraulic support return liquid subsystem includes: A return liquid storage tank for temporarily storing hydraulic support return liquid; A return liquid power pump for delivering return liquid to the check valve for return liquid; A merging valve for collecting return liquid from different working faces and returning it to the return liquid filtering station.

6. A method for remote liquid supply for a coal mine, suitable for the remote liquid supply system for a coal mine according to any one of claims 1 to 5, characterized in that, It includes: Establishing a liquid supply circuit to adjust the liquid supply of different working faces with different liquid supply requirements on the liquid supply circuit, which includes an output automatic adjustment subsystem of the liquid supply system, a long-distance pipeline monitoring subsystem, a hydraulic support input emulsion distribution subsystem, and a hydraulic support return liquid subsystem; Adjusting the liquid supply of different working faces with different liquid supply requirements on the liquid supply circuit includes: Automatically adjusting the flow and pressure of the liquid supply system through the output automatic adjustment subsystem, and adjusting the working state of the pump station according to the actual demand; Using the long-distance pipeline monitoring subsystem to monitor the flow, pressure, temperature, and leakage in the pipeline in real time, and sending the monitoring data to the monitoring center; Dividing the high-pressure emulsion into multiple independent working face liquid supply circuits through the hydraulic support input emulsion distribution subsystem; Collecting hydraulic support return liquid and delivering it back to the return liquid filtering station of the liquid supply system.

7. The method of claim 6, wherein the method further comprises: The automatic adjustment of the flow and pressure of the liquid supply system through the output automatic adjustment subsystem, and the adjustment of the working state of the pump station according to the actual demand, includes: Starting or stopping the pump station according to the comparison result of the actual output pressure and the preset target value within a set time; Variable frequency speed regulation and pressure control: adjusting the frequency output of the frequency converter to change the motor speed through the PID control algorithm according to the comparison of the actual output pressure and the pressure reference value preset by the frequency converter; According to the boost value and unloading value set for different pump stations, the state of the unloading valve is switched when the electromagnet is powered on or powered off, thereby controlling the working mode of each pump station.

8. The coal mine remote liquid supply method according to claim 6, characterized in that, The division of high-pressure emulsion into multiple independent working face liquid supply circuits through the hydraulic support input emulsion distribution subsystem includes: Distributing the emulsion output by the liquid supply system into multiple paths through a shunt valve according to the number of working faces; Monitoring the working face system pressure of each path and adjusting the boost value and unloading value of the electromagnetic unloading valve according to the working face system pressure monitoring value.

9. The method of claim 6, wherein, The collection of hydraulic support return liquid and its delivery back to the return liquid filtering station of the liquid supply system includes: Injecting the hydraulic support return liquid of three working faces into their respective return liquid storage tanks and monitoring the liquid level of the storage tank in real time; When the liquid level reaches the high limit value, start the return liquid power pump to deliver the return liquid to the check valve, and finally return it to the return liquid filtering station of the liquid supply system through the merging valve.

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