Active monitoring system and working method for hydraulic support long pipeline liquid supply system

Abstract

The application provides a hydraulic support long pipeline liquid supply system active monitoring system and working method, which is suitable for the field of intelligent operation and maintenance of the hydraulic support liquid supply system. The system comprises a power generation device connected with and powered by an emulsion pump station, a monitoring device arranged on a liquid supply pipeline and used for actively detecting pressure signals and impact signals of inlet and return liquid pipelines, and a switch control device used for predicting the position of the maximum impact and controlling the power generation device to supply power to the monitoring device; the excess hydraulic energy of the emulsion pump station is converted and stored into electric energy, and the monitoring device is powered through a transformer; in combination with the monitoring data of the outlet pressure of the liquid supply system, the impact dangerous interval in the corresponding pipeline is calculated and judged through a long pipeline power transmission prediction model, and then the impact dangerous interval is powered to carry out active monitoring and early warning, and when the impact exceeds the set threshold, the pressure of the accumulator of the liquid supply system is actively regulated to realize the buffering of the liquid supply end.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent operation and maintenance of long pipeline liquid supply system of hydraulic support, and particularly relates to an active monitoring system and working method of long pipeline liquid supply system of hydraulic support. BACKGROUND

[0002] With the development of coal mining towards intelligence, intelligent working face puts forward higher requirements on the output capacity and control level of the liquid supply system of hydraulic support: first, the power, pressure, flow and delivery distance of the liquid supply system are greatly increased, and second, the liquid supply system must be quickly responsive and continuously controllable to adapt to the requirements of key operation procedures such as support rapid following machine and working face straightening of intelligent working face. The fluid power in the long pipeline of the high-power liquid supply system evolves dramatically, and the pipeline impact and power lag are serious, which often leads to pipeline explosion and other accidents, seriously affecting production safety.

[0003] Therefore, in view of the reliability protection requirements of the high-power long-distance liquid supply system pipeline of high-yield and high-efficiency working face, an active monitoring system and working method of long pipeline liquid supply system of hydraulic support are proposed, which combines active power supply and sensor signal monitoring, and has great significance for realizing pressure prediction control, system pressure stabilization control and improving the liquid supply technology level of the hydraulic system of the support. SUMMARY

[0004] In view of the deficiencies of the prior art, an active monitoring system and working method of long pipeline liquid supply system of hydraulic support are provided, which has simple steps, is convenient to use, can be directly modified and used on the existing equipment, and can realize active monitoring and maintenance of high-pressure and high-flow liquid supply system under strong time-varying conditions without additional power supply.

[0005] In order to achieve the above purpose, the present application provides an active monitoring system of long pipeline liquid supply system of hydraulic support, which comprises an emulsion pump station for providing hydraulic power and a hydraulic support liquid system. The emulsion pump station and the hydraulic support liquid system are connected by a long pipeline. The long pipeline comprises an inlet pipeline and a return pipeline. The inlet pipeline and the return pipeline are connected by a plurality of pipe segments. The emulsion pump station absorbs liquid from a liquid tank through a filter into the long pipeline. The liquid enters the hydraulic support liquid system from the inlet pipeline, and then returns to the liquid tank through the return pipeline of the long pipeline. The hydraulic support liquid system comprises an electro-hydraulic reversing valve and a hydraulic support. When the emulsion enters the electro-hydraulic reversing valve through the long pipeline, the action of the hydraulic support is controlled by the opening and closing of the electro-hydraulic reversing valve.

[0006] The hydraulic support long pipeline liquid supply system active monitoring system comprises a power generation device connected with and functional to the emulsion pump station, a monitoring device arranged on the liquid supply pipeline to actively detect pressure signals and impact signals of the inlet and return liquid pipelines, and a switch control device to predict the position of the maximum impact and control the power generation device to supply power to the monitoring device at the position of the maximum impact; wherein the monitoring device is a plurality of groups of sensors arranged at intervals on the liquid supply pipeline, and each group of sensors comprises a vibration sensor and a pressure sensor.

[0007] The power generation device comprises an accumulator connected to the emulsion pump station pipeline through a proportional pressure valve 1, which converts and stores the excess hydraulic energy of the hydraulic support long pipeline liquid supply system into electrical energy. The switch control device combines the emulsion pump station outlet pressure monitoring data and the hydraulic support reversing valve switch signal, uses a long pipeline power transmission prediction model to calculate the pipe section on which the maximum impact occurs on the liquid supply pipeline and the time when the maximum impact occurs, records the pipe section on which the maximum impact occurs on the liquid supply pipeline as the impact danger interval, supplies power to the monitoring device arranged on the impact danger section to actively monitor and warn, and actively adjusts the pressure of the accumulator through the proportional pressure valve 1 when the impact exceeds the set threshold to achieve buffering at the liquid supply end.

[0008] Further, the power generation device comprises an accumulator, the inlet of the accumulator is connected with a proportional pressure valve 1 and a proportional pressure valve 2 through a tee joint, the proportional pressure valve 1 is connected with the emulsion pump station through a pipeline, and the proportional pressure valve 2 is sequentially connected with a hydraulic motor, a generator, a lithium battery and a transformer through a pipeline, the transformer is connected with each group of sensors in the monitoring device through a power line, and whether to work is controlled through a power supply circuit switch.

[0009] Further, the switch control device controls the power generation device to supply power to the monitoring device by the following method:

[0010] The pressure liquid enters the branch of the power generation device from the emulsion pump station, when the outlet pressure reaches the set pressure of the proportional pressure valve 1, the proportional pressure valve 1 opens, the main oil circuit is unloaded, and the accumulator is charged; when the pressure in the accumulator reaches the set pressure of the proportional pressure valve 2, the proportional pressure valve 2 opens, the accumulator is discharged, the pressure liquid drives the hydraulic motor to rotate, the generator generates electricity, the hydraulic energy is converted into electrical energy, and the pressure liquid flows back to the liquid tank; the electrical energy generated by the generator is stored in the lithium battery, and the lithium battery supplies power to the monitoring device through the transformer.

[0011] Further, the liquid supply pipeline and the return liquid pipeline divide the long pipeline into n pipe sections according to the distance to the emulsion pump station, and the length of each pipe section is l i (i = 1, 2, …, n), the distance between the dangerous impact pipe section and the emulsion pump station is l The adjacent pipe sections are connected through a pipeline joint.

[0012] Further, the pressure sensor in the sensor group is installed at the pipe joint of each pipe section to detect the front and back pressure of each pipe section, and the vibration sensor is installed on the pipe surface of each pipe section to detect the impact signal; the impact signal and pressure information generated by the vibration sensor and the pressure sensor are collected by the acquisition card, and finally displayed and stored in the monitoring interface of the upper computer.

[0013] A working method of a hydraulic support long pipe supply system active monitoring system, the steps are as follows:

[0014] Step one, the emulsion pump station sucks the pressure liquid from the liquid tank through the filter into the support hydraulic system through the long pipe, the switch of the reversing valve controls the action of the hydraulic support, after the action is completed, the emulsion returns to the liquid tank through the return pipe.

[0015] Step two, when the outlet pressure of the emulsion pump station is higher than the set pressure of the proportional pressure valve 1, the proportional pressure valve 1 is opened, the supply pipe is unloaded, and the accumulator is energized; when the pressure of the accumulator is higher than the set pressure of the proportional pressure valve 2, the proportional pressure valve 2 is opened, the accumulator is discharged, the pressure liquid drives the hydraulic motor to rotate, the generator charges the lithium battery, and the lithium battery can supply power to the detection device through the transformer;

[0016] Step three, the outlet pressure is detected by the pressure sensor at the outlet of the emulsion pump station, and the switch signal of the electro-hydraulic reversing valve, the long pipe power transmission prediction model calculates the pipe section position x i of the maximum impact and the pressure distribution function f(x i ,Δp,Δt) of the whole working face supply pipe.

[0017] Step four, substituting the pipe section position x i of the maximum impact into the pressure distribution function f(x i ,Δp,Δt), the pressure loss Δp and the pipe pressure transmission time Δt of the pipe section where the maximum impact occurs are obtained, Δt is the time when the maximum impact occurs, so as to obtain the impact danger interval to be monitored, and the sensor power supply switch logic of the monitoring device corresponding to the pipe section of the impact danger interval is generated, the power supply switch of the monitoring device is opened in advance on the pipe section corresponding to the predicted impact danger interval before the maximum impact occurs, and active monitoring is implemented in advance;

[0018] Step five, the vibration sensor and the pressure sensor in the opened monitoring device transmit the pressure signal and the impact signal of the pipe section of the predicted impact danger interval to the acquisition card in advance according to the sensor before the predicted impact danger occurs, and the monitoring interface is displayed; when the impact collected by the acquisition card exceeds the set threshold, the proportional pressure valve 1 in the power generation device is actively adjusted, the proportional pressure valve 1 is opened, and the energy accumulator in the power generation device is used to absorb energy to buffer the supply of the hydraulic support long pipe supply system.

[0019] Furthermore, in the monitoring interface, the pipe sections where the impact exceeds the set threshold are marked as dangerous pipe sections, and continuous active monitoring is carried out until the monitoring parameters reach the normal range.

[0020] Furthermore, the long pipeline dynamic prediction model is a virtual model generated in a computer to match the long pipeline fluid supply system of the hydraulic support. The long pipeline dynamic prediction model considers the influence of the turbulent state and strong time-varying load in the pipeline on the characteristics of the long pipeline, and corrects the friction term according to the high-pressure, high-flow turbulent unsteady flow pipeline equation. In this way, the dynamic change law of the pressure in the support fluid supply system with long pipeline, high-pressure, high-flow and strong time-varying load characteristics is understood. The long pipeline dynamic prediction model uses the high-pressure, high-flow turbulent unsteady flow pipeline equation modified by the Brunone additional friction model and the pressure wave transmission velocity formula to calculate the pressure wave velocity a and the flow velocity v in the pipeline:

[0021] Pressure wave transmission velocity formula:

[0022] When one end of the pipe is free:

[0023] When all pipes are fixed:

[0024] When the pipeline is unconstrained:

[0025] Where K is the bulk elastic modulus, ρ is the emulsion density, e is the tube wall thickness, E is the Young's modulus, and μ is the Poisson's ratio;

[0026] The high-pressure, high-flow, turbulent, unsteady flow pipeline equation modified by the Brunone additional friction model is:

[0027]

[0028] Where g is the acceleration due to gravity, H is the relative height difference of the pipeline, v is the flow velocity of the fluid in the pipeline, a is the pressure wave velocity, k3 is the Brunone friction coefficient, f is the friction coefficient in the pipeline, θ is the angle between the pipeline and the horizontal line, and D is the pipeline diameter.

[0029] Furthermore, the calculation method for the position interval where the maximum impact occurs on the liquid supply pipeline is:

[0030]

[0031] where x i is the distance between the maximum impact position and the inlet of the emulsion pump station, a is the pressure wave transmission speed, Δt1 is the time it takes for the pressure wave to be generated at the head end minus the time it takes for the pressure wave to be generated at the tail end, and l is the length of the pipeline.

[0032] Furthermore, the long pipeline dynamic prediction model is used to solve the characteristic line method using the outlet pressure of the emulsion pump station and the amount of liquid used by the support obtained by the switch signal of the electromagnetic reversing valve of the hydraulic support as boundary conditions, and the position x where the maximum impact occurs is calculated. i And the pressure distribution function f(x i ,Δp,Δt),

[0033] Using the formula: Calculate the distance x between the maximum impact position and the emulsion pump station i , the length of each pipe segment is l i (i=1,2…,n);

[0034] The pressure loss Δp of each pipe section is calculated by using the characteristic line method according to the boundary conditions;

[0035] Using the formula: Calculate the long pipeline pressure transmission time Δt;

[0036] x i Substitute the pressure distribution function f(x i ,Δp,Δt), we can get the pressure loss Δp of the pipeline where the maximum impact occurs and the pipeline pressure transmission time Δt, Δt is the time when the maximum impact occurs.

[0037] Beneficial effects: The present invention proposes an active monitoring and maintenance method for a long pipeline fluid supply system of a hydraulic support. On the basis of the long pipeline of the hydraulic support, the power supply switch of the monitoring device is controlled by a long pipeline power transmission prediction model, which can improve the reliability of the system, detect faults in advance, and facilitate maintenance; since the underground power supply is limited by the initial planning of the construction, the power supply capacity of the power supply is limited, and the present device includes a power generation device, which can use the emulsion pump station to generate electricity, and power the monitoring device on the pipeline without an external power supply, which is convenient for direct modification and use based on the existing working face equipment; at the same time, since the electric energy is limited, the present method provides a method for actively predicting impact hazards, thereby detecting and eliminating impact hazards in pipe sections where impact hazards may occur in advance, which not only effectively improves energy utilization, but also has good use effect and wide practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of active monitoring and maintenance method for long pipeline fluid supply system of hydraulic support DETAILED DESCRIPTION

[0039] The following drawings further illustrate the embodiments of the present invention.

[0040] like Figure 1As shown, the application discloses a hydraulic support long pipeline liquid supply system active monitoring system, which comprises a liquid supply pipeline, a monitoring device, a power generation device and a switch control device, wherein the power generation device selectively supplies power to the monitoring device in sections, and the monitoring device actively detects pressure signals and impact signals of the inlet and return liquid pipelines.

[0041] The liquid supply pipeline comprises an emulsion pump station, an inlet liquid pipeline, a return liquid pipeline and a hydraulic support liquid system, wherein the emulsion pump station absorbs liquid from a liquid tank into the long pipeline through a filter, the liquid enters the hydraulic support liquid system from the inlet liquid pipeline, and then returns to the liquid tank through the return oil pipeline of the long pipeline; the hydraulic support liquid system comprises an electro-hydraulic reversing valve and a hydraulic support, and the action of the hydraulic support is controlled by the opening and closing of the electro-hydraulic reversing valve when the emulsion enters the electro-hydraulic reversing valve through the long pipeline.

[0042] As shown in the drawings, Figure 1 The liquid supply pipeline and the return liquid pipeline divide the long pipeline into n sections according to the distance to the emulsion pump station, and the length of each section is l i (i = 1, 2…, n), and the distance between the pipelines to the emulsion pump station is l The adjacent pipelines are connected through pipeline joints.

[0043] As shown in the drawings, Figure 1 The power generation device comprises an accumulator, proportional pressure valves, a hydraulic motor, a generator, a lithium battery, a transformer, a liquid tank and a switch for the power supply circuit of the monitoring device, wherein there are two proportional pressure valves, the proportional pressure valve 1 is in front of the accumulator, and the proportional pressure valve 2 is behind the accumulator.

[0044] As shown in the drawings, Figure 1 The power generation device of the hydraulic support long pipeline liquid supply system active monitoring method supplies power to the monitoring device in the following way:

[0045] The pressure liquid enters the branch where the power generation device is located from the emulsion pump station, when the outlet pressure reaches the set pressure of the proportional pressure valve 1, the proportional pressure valve 1 opens, the main oil circuit is unloaded, and the accumulator is charged; when the pressure in the accumulator reaches the set pressure of the proportional pressure valve 2, the proportional pressure valve 2 opens, the accumulator is discharged, the pressure liquid drives the hydraulic motor to rotate, the generator generates electricity, the hydraulic energy is converted into electrical energy, and the pressure liquid flows back to the liquid tank; the electrical energy generated by the generator is stored in the lithium battery, and the lithium battery supplies power to the monitoring device through the transformer.

[0046] As shown in the drawings, Figure 1 The monitoring device comprises pressure sensors, vibration sensors, acquisition cards and a monitoring interface, wherein the pressure sensors are installed at the pipeline joints of each pipeline to detect the front and rear pressures of each pipeline, and the vibration sensors are installed on the surface of each pipeline to detect impact signals.

[0047] AsFigure 1 As shown, the monitoring device of the active monitoring and maintenance method of the long pipeline liquid supply system of the hydraulic support monitors the outlet pressure and impact of the long pipeline in the following ways:

[0048] The switch control device selects the pipeline section to be monitored and supplies power to its corresponding sensor. When the pressure liquid flows through the long pipeline to be monitored, the pressure sensor detects the outlet pressure signal at the junction of the pipelines, and the vibration sensor detects the impact signal on the surface of the long pipeline. The pressure signal and impact signal are collected by the acquisition card and displayed on the monitoring interface, playing the role of active monitoring.

[0049] like Figure 1 As shown, the switch control device includes a pressure sensor for detecting the outlet pressure of the emulsion pump station and a long pipeline power transmission prediction model. The long pipeline power transmission prediction model predicts the time and position of the maximum impact in the pipeline, and the maximum monitoring interval of the pipeline is obtained according to the position and time of the maximum impact, thereby obtaining the sensor power supply switch logic.

[0050] The long pipeline dynamic prediction model considers the influence of the turbulent state and strong time-varying load on the long pipeline characteristics, and corrects the friction term according to the working conditions. It can grasp the dynamic changes in pressure of the support liquid supply system with long pipelines, high pressure, large flow, and strong time-varying load characteristics. It includes the high-pressure, high-flow, turbulent unsteady flow pipeline equation modified by the Brunone additional friction model:

[0051]

[0052] Where g is the acceleration due to gravity, H is the relative height difference of the pipeline, v is the flow velocity of the fluid in the pipeline, a is the pressure wave velocity, k3 is the Brunone friction coefficient, f is the friction coefficient in the pipeline, θ is the angle between the pipeline and the horizontal line, and D is the pipeline diameter.

[0053] The model also includes the maximum impact position calculation equation:

[0054]

[0055] where x i is the distance between the maximum impact position and the inlet of the emulsion pump station, a is the pressure wave transmission speed, Δt1 is the time it takes for the pressure wave to be generated at the head end minus the time it takes for the pressure wave to be generated at the tail end, and l is the length of the pipeline.

[0056] The long pipeline dynamic prediction model can calculate the pressure at any point in the pipeline. The outlet pressure of the emulsion pump station (the pipeline inlet pressure) and the hydraulic support end liquid state (the hydraulic support electromagnetic reversing valve switch signal) are inputs, and the output is the position where the maximum impact occurs x i And the pressure distribution function f(xi ,Δp,Δt), where x i The distance between the maximum impact position and the emulsion pump station Δp is the pressure loss of each section of the pipeline, and Δt is the pressure transmission time of the long pipeline. i Substitute the pressure distribution function f(x i ,Δp,Δt), we can get the pressure loss Δp of the pipeline where the maximum impact occurs and the pipeline pressure transmission time Δt, Δt is the time when the maximum impact occurs.

[0057] like Figure 1 As shown, the proportional pressure valve 1 actively lowers the set pressure when detecting that the maximum impact exceeds the set threshold, the proportional pressure valve 1 opens, and the accumulator absorbs energy to buffer the liquid supply system.

[0058] As a further method, the active monitoring system and working method of the hydraulic support long pipeline liquid supply system include the following steps:

[0059] Step 1: The emulsion pump station sucks pressure liquid from the liquid tank through the filter and enters the support hydraulic system through a long pipeline. The switch of the reversing valve controls the action of the hydraulic support. After the action is completed, the emulsion returns to the liquid tank through the return pipeline.

[0060] Step 2: When the outlet pressure of the emulsion pump station is higher than the set pressure of proportional pressure valve 1, the proportional pressure valve opens, the liquid supply pipeline is unloaded, and the accumulator stores energy; when the pressure of the accumulator is higher than the set pressure of proportional pressure valve 2, proportional pressure valve 2 opens, the accumulator discharges energy, and the pressure liquid drives the hydraulic motor to rotate, driving the generator to charge the lithium battery, and the lithium battery supplies power to the sensor through the transformer.

[0061] Step 3: The outlet pressure detected by the pressure sensor at the outlet of the emulsion pump station and the switch signal of the electro-hydraulic reversing valve are input into the long pipeline power transmission prediction model. The long pipeline power transmission prediction model outputs the position x where the maximum impact occurs. i And the pressure distribution function f(x i ,Δp,Δt),x i The distance between the maximum impact position and the emulsion pump station x i Substitute the pressure distribution function f(x i ,Δp,Δt), the pressure loss Δp of the pipeline where the maximum impact occurs and the pipeline pressure transmission time Δt can be obtained. Δt is the time when the maximum impact occurs, so the dangerous section that needs to be monitored is obtained, that is, the pipeline active monitoring interval. The sensor power supply switch logic is obtained through this interval, and then the switch signal is obtained. The switch power supply is actively turned on at the time and position when the maximum impact occurs to realize active monitoring.

[0062] Step four: the vibration sensor installed on the surface of each long pipe and the pressure sensor installed at the joint of the long pipes actively monitor the position of the maximum impact at the time of its occurrence according to the switch signal obtained in step two, and transmit the pressure signal and the impact signal to the acquisition card, which is displayed through the monitoring interface.

[0063] Step five: when the impact collected by the acquisition card exceeds the set threshold, the proportional pressure valve 1 in the power generation device is actively adjusted, the proportional pressure valve 1 is opened, and the accumulator absorbs energy to buffer the liquid supply system.

Claims

1. An active monitoring system for a long pipeline fluid supply system of a hydraulic support, characterized by: The long pipeline fluid supply system of the hydraulic support includes an emulsion pump station that provides hydraulic power and a hydraulic support fluid system. The emulsion pump station and the hydraulic support fluid system are connected by a long pipeline. The long pipeline includes a liquid inlet pipeline and a liquid return pipeline. The liquid inlet pipeline and the liquid return pipeline are both composed of multiple pipe sections connected end to end. The emulsion pump station draws liquid from the liquid tank through a filter into the long pipeline, and then from the liquid inlet pipeline to the hydraulic support fluid system. Then, the liquid is returned to the liquid tank from the hydraulic support fluid system through the return oil pipeline of the long pipeline. The hydraulic support fluid system includes an electro-hydraulic reversing valve and a hydraulic support. When the emulsion enters the electro-hydraulic reversing valve through the long pipeline, the action of the hydraulic support is controlled by switching the electro-hydraulic reversing valve. The active monitoring system for the long pipeline liquid supply system of the hydraulic support includes a power generation device connected to and powered by the emulsion pump station, a monitoring device arranged on the liquid supply pipeline for actively detecting pressure signals and impact signals of the liquid inlet and return pipelines, and a switch control device for predicting the location where the maximum impact occurs and controlling the power generation device to supply power to the monitoring device at the location where the maximum impact occurs; wherein the monitoring device is a plurality of sensor groups arranged at intervals on the liquid supply pipeline, and the sensor groups include vibration sensors and pressure sensors; The power generation device includes an accumulator connected to the emulsion pump station pipeline through a proportional pressure valve 1, which converts and stores excess hydraulic energy of the hydraulic support long pipeline supply system into electrical energy. The switch control device combines the emulsion pump station outlet pressure monitoring data and the hydraulic support reversing valve switch signal, and uses the long pipeline power transmission prediction model to calculate the pipe section of the supply pipeline where the maximum impact occurs and the time when the maximum impact occurs. The pipe section of the supply pipeline where the maximum impact occurs is recorded as the impact danger interval, and the power supply of the monitoring device arranged in the impact danger section is actively monitored and warned. When the impact exceeds the set threshold, the proportional pressure valve 1 in the power generation device is actively regulated, and the pressure of the accumulator is actively lowered through the proportional pressure valve 1 to achieve buffering at the supply end.

2. The active monitoring system for the long pipeline liquid supply system of the hydraulic support according to claim 1 is characterized in that: The power generation device includes an accumulator, and the accumulator inlet is connected to a proportional pressure valve 1 and a proportional pressure valve 2 through a tee, wherein the proportional pressure valve 1 is connected to the emulsion pump station through a pipeline, and the proportional pressure valve 2 is sequentially connected to a hydraulic motor, a generator, a lithium battery and a transformer through pipelines. The transformer is connected to each group of sensors in the monitoring device through a power line, and is controlled to work by the power supply circuit switch.

3. The active monitoring system for the long pipeline liquid supply system of the hydraulic support according to claim 2 is characterized in that: The switch control device controls the power generation device to supply power to the monitoring device through the following methods: The pressure liquid enters the branch where the power generation device is located from the emulsion pump station. When the outlet pressure reaches the set pressure of proportional pressure valve 1, proportional pressure valve 1 opens, the main oil circuit is unloaded, and the accumulator is charged; when the pressure in the accumulator reaches the set pressure of proportional pressure valve 2, proportional pressure valve 2 opens, the accumulator discharges energy, and the pressure liquid drives the hydraulic motor to rotate, driving the generator to generate electricity. The hydraulic energy is converted into electrical energy, and the pressure liquid flows back to the liquid tank; the electrical energy generated by the generator is stored in the lithium battery, and the lithium battery supplies power to the monitoring device through the transformer.

4. The active monitoring system for the long pipeline liquid supply system of a hydraulic support according to claim 1 is characterized in that: The liquid supply pipeline and the liquid return pipeline are divided into n sections according to the distance to the emulsion pump station. The length of each section is l i (i=1,2...,n), distance between the dangerous impact pipeline and the emulsion pumping station Adjacent pipe sections are connected through pipe joints.

5. The active monitoring system for the long pipeline liquid supply system of the hydraulic support according to claim 4 is characterized in that: The pressure sensor in the sensor group is installed at the pipe joint of each pipe section to detect the front and rear pressure of each pipe section, and the vibration sensor is installed on the pipe surface of each pipe section to detect the impact signal; the impact signal and pressure information generated by the vibration sensor and pressure sensor are collected by the acquisition card and finally displayed and stored in the monitoring interface of the host computer.

6. A method for operating the active monitoring system for the long pipeline fluid supply system of a hydraulic support according to any one of the above claims, characterized in that: Here are the steps: Step 1: The emulsion pump station sucks pressure liquid from the liquid tank through the filter and enters the support hydraulic system through a long pipeline. The switch of the reversing valve controls the action of the hydraulic support. After the action is completed, the emulsion returns to the liquid tank through the return pipeline; Step 2: When the outlet pressure of the emulsion pump station is higher than the set pressure of proportional pressure valve 1, proportional pressure valve 1 opens, the liquid supply pipeline is unloaded, and the accumulator is charged; when the pressure of the accumulator is higher than the set pressure of proportional pressure valve 2, proportional pressure valve 2 opens, the accumulator discharges energy, and the pressure fluid drives the hydraulic motor to rotate, driving the generator to charge the lithium battery, so that the lithium battery can power the detection device through the transformer; Step 3: Use the pressure sensor at the outlet of the emulsion pump station to detect the outlet pressure and the switch signal of the electro-hydraulic reversing valve. The long pipeline power transmission prediction model calculates the pipe section position x where the maximum impact occurs. i And the pressure distribution function f(x i ,Δp,Δt); Step 4: Set the pipe section position where the maximum impact occurs to x i Substitute the pressure distribution function f(x i ,Δp,Δt), and obtain the pressure loss Δp and pipeline pressure transmission time Δt of the pipe section where the maximum impact occurs. Δt is the time when the maximum impact occurs, thereby obtaining the impact danger interval that needs to be monitored. For the pipe section corresponding to the impact danger interval, the sensor power supply switch logic of the monitoring device is generated. Before the time when the maximum impact occurs, the power supply switch of the monitoring device is turned on on the pipe section corresponding to the impact danger interval predicted to have the impact danger interval, and active monitoring is implemented in advance; Step 5. The vibration sensor and pressure sensor in the opened monitoring device transmit the pressure signal and impact signal of the pipe section in the predicted impact danger interval to the acquisition card according to the sensor before predicting the impact danger, and display it through the monitoring interface; when the impact collected by the acquisition card exceeds the set threshold, the proportional pressure valve 1 in the power generation device is actively adjusted, the proportional pressure valve 1 is opened, and the accumulator in the power generation device is used to absorb energy to buffer the long pipeline liquid supply system of the hydraulic support.

7. The working method according to claim 6, characterized in that: In the monitoring interface, the pipe section where the impact exceeds the set threshold is marked as a dangerous pipe section, and continuous active monitoring is carried out until the monitoring parameters reach the normal range.

8. The working method according to claim 6, characterized in that: The long pipeline dynamic prediction model is a virtual model generated in a computer to match the hydraulic support long pipeline fluid supply system. It considers the effects of the turbulent flow state and strong time-varying load on the long pipeline characteristics and corrects the friction term based on the high-pressure, high-flow, turbulent, unsteady flow pipeline equation. This allows the dynamic variation of pressure in the support fluid supply system characterized by long pipelines, high pressure, high flow, and strong time-varying loads to be understood. The long pipeline dynamic prediction model uses the high-pressure, high-flow, turbulent, unsteady flow pipeline equation modified by the Brunone additional friction model and the pressure wave transmission velocity formula to calculate the pressure wave velocity a and the flow velocity v in the pipeline: Pressure wave transmission velocity formula: When one end of the pipe is free: When all pipes are fixed: When the pipeline is unconstrained: Where K is the bulk elastic modulus, ρ is the emulsion density, e is the tube wall thickness, E is the Young's modulus, and μ is the Poisson's ratio; The high-pressure, high-flow, turbulent, unsteady flow pipeline equation modified by the Brunone additional friction model is: Where g is the acceleration due to gravity, H is the relative height difference of the pipeline, v is the flow velocity of the fluid in the pipeline, a is the pressure wave velocity, k3 is the Brunone friction coefficient, f is the friction coefficient in the pipeline, θ is the angle between the pipeline and the horizontal line, and D is the pipeline diameter.

9. The working method according to claim 8, characterized in that: The calculation method for the position interval where the maximum impact occurs on the liquid supply pipeline is: where x i is the distance between the maximum impact position and the inlet of the emulsion pump station, a is the pressure wave transmission speed, Δt1 is the time it takes for the pressure wave to be generated at the head end minus the time it takes for the pressure wave to be generated at the tail end, and l is the length of the pipeline.

10. The working method according to claim 9, characterized in that: The long pipeline dynamic prediction model is used to solve the problem by taking the outlet pressure of the emulsion pump station and the amount of liquid used by the support obtained by the switch signal of the electromagnetic reversing valve of the hydraulic support as the boundary conditions. The position x where the maximum impact occurs is calculated. i And the pressure distribution function f(x i ,Δp,Δt), Using the formula: Calculate the distance x between the maximum impact position and the emulsion pump station i , the length of each pipe segment is l i (i=1,2...,n); The pressure loss Δp of each pipe section is calculated by using the characteristic line method according to the boundary conditions; Using the formula: Calculate the long pipeline pressure transmission time Δt; x i Substitute the pressure distribution function f(x i ,Δp,Δt), we can get the pressure loss Δp of the pipeline where the maximum impact occurs and the pipeline pressure transmission time Δt, Δt is the time when the maximum impact occurs.

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