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

Abstract

The invention provides an active monitoring system of a hydraulic support long pipeline liquid supply system and a working method, and is suitable for the field of intelligent operation and maintenance of hydraulic support liquid supply systems. Comprising a power generation device which is connected with an emulsion pump station and supplies energy, a monitoring device which is arranged on a liquid supply pipeline and is used for actively detecting a pressure signal and an impact signal of a liquid inlet and return pipeline, and a switch control device which is used for pre-judging a maximum impact occurrence position and controlling the power generation device to supply power to the monitoring device at the maximum impact occurrence position, excess hydraulic energy of an emulsion pump station is converted and stored into electric energy, power is supplied to a monitoring device through a transformer, an impact danger interval in a corresponding pipeline is calculated and judged by combining outlet pressure monitoring data of a liquid supply system and through a long-pipeline power transmission prediction model, then power is supplied to the impact danger interval, and active monitoring and early warning are carried out. And when the impact exceeds a set threshold value, the pressure of an energy accumulator of the liquid supply system is actively regulated and controlled, and buffering of the liquid supply end is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent operation and maintenance of a long pipeline fluid supply system for a hydraulic support, and in particular to an active monitoring system and a working method for a long pipeline fluid supply system for a hydraulic support. Background Art

[0002] As coal mining develops towards intelligence, intelligent work faces higher requirements for the output capacity and control level of hydraulic support fluid supply systems: first, the power, pressure, flow and transportation distance of the fluid supply system are greatly increased; second, the fluid supply system must respond quickly and be continuously controllable to meet the requirements of key intelligent working face operations such as rapid support follow-up and face straightening. The fluid dynamics in the long pipelines of the high-power fluid supply system evolve violently, and the pipeline impact and power lag are serious, which often leads to accidents such as pipeline bursts, seriously affecting production safety.

[0003] Therefore, in response to the demand for pipeline reliability assurance of high-power and long-distance fluid supply systems in high-yield and high-efficiency working faces, an active monitoring system and working method for long pipeline fluid supply systems of hydraulic supports based on active power supply and sensor signal monitoring is proposed, which is of great significance for realizing pressure prediction control of the support hydraulic system, system pressure stabilization control and improving the fluid supply technology level of the fully mechanized mining working face. Summary of the invention

[0004] In view of the shortcomings of the existing technology, an active monitoring system and working method for the long pipeline fluid supply system of a hydraulic support are provided. The system has simple steps and is easy to use. It can be directly modified and used on the existing equipment. No additional power supply is required to achieve active monitoring and maintenance of the high-pressure and large-flow fluid supply system under highly time-varying working conditions.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an active monitoring system for a long pipeline liquid supply system of a hydraulic support, wherein the long pipeline liquid supply system of the hydraulic support comprises an emulsion pump station providing hydraulic power and a liquid system for the hydraulic support, wherein the emulsion pump station and the liquid system for the hydraulic support are connected via a long pipeline, wherein the long pipeline comprises a liquid inlet pipeline and a liquid return pipeline, wherein the liquid inlet pipeline and the liquid return pipeline are both composed of a plurality of pipe sections connected end to end; the emulsion pump station sucks liquid from a liquid tank into the long pipeline through a filter, and then from the liquid inlet pipeline to the liquid system for the hydraulic support, and then from the liquid system for the hydraulic support to the liquid tank through the return oil pipeline of the long pipeline, wherein the liquid system for the hydraulic support comprises an electro-hydraulic reversing valve and a hydraulic support, and when the emulsion enters the electro-hydraulic reversing valve through the long pipeline, the action of the hydraulic support is controlled by the switch of the electro-hydraulic reversing valve;

[0006] The active monitoring system for the long pipeline liquid supply system of the hydraulic support includes a power generation device connected and functional with the emulsion pump station, a monitoring device arranged on the liquid supply pipeline for actively detecting the pressure signal and impact signal of the liquid return pipeline, and a switch control device for predicting the maximum impact position and controlling the power generation device to supply power to the monitoring device at the maximum impact position; 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;

[0007] The power generation device includes 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 long pipeline liquid supply system of the hydraulic support into electrical energy. The switch control device combines the outlet pressure monitoring data of the emulsion pump station and the switching signal of the reversing valve of the hydraulic support, and uses the long pipeline power transmission prediction model to calculate the pipe section on the liquid supply pipeline where the maximum impact occurs and the time when the maximum impact occurs. The pipe section on the liquid supply pipeline where the maximum impact occurs is recorded as the impact danger section, and the power supply of the monitoring device arranged on 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 adjusted, and the pressure of the accumulator is actively lowered through the proportional pressure valve 1 to achieve buffering at the liquid supply end.

[0008] Furthermore, the power generation device includes an accumulator, and the accumulator inlet is respectively 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 a pipeline, and the transformer is respectively connected to each group of sensors in the monitoring device through a power line, and is controlled to work or not through a power supply circuit switch.

[0009] Furthermore, 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 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.

[0011] Furthermore, the liquid supply pipeline and the liquid return pipeline are divided into n segments according to the distance to the emulsion pump station, and the length of each segment is l i (i=1,2...,n), distance between the dangerous impact pipeline and the emulsion pump station Adjacent pipe sections are connected via pipe joints.

[0012] Furthermore, the pressure sensor in the sensor group is installed at the pipe joint of each pipe section to detect the front and rear pressures 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 through the acquisition card, and finally displayed and stored in the monitoring interface of the host computer.

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

[0014] 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.

[0015] Step 2: 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 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 the proportional pressure valve 2, the 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;

[0016] Step 3: The outlet pressure and the switch signal of the electro-hydraulic reversing valve are detected by the pressure sensor at the outlet of the emulsion pump station. 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);

[0017] Step 4: Set the pipe section position x where the maximum impact occurs i Substituting 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, so as to obtain 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 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 occur, and active monitoring is implemented in advance;

[0018] 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 fluid supply system of the hydraulic support.

[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 the computer to match the long pipeline fluid supply system of the hydraulic support. The long pipeline dynamic prediction model is used to consider the influence of the turbulent state and strong time-varying load in the pipeline on the characteristics of the long pipeline, and the friction term is corrected according to the high-pressure, large-flow turbulent non-steady flow pipeline equation, so as to grasp the dynamic change law of the support fluid supply system with long pipelines, high-pressure, large-flow and strong time-varying load characteristics; the long pipeline dynamic prediction model uses the high-pressure, large-flow turbulent non-steady flow pipeline equation corrected 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 speed formula:

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

[0023] When all pipes are fixed:

[0024] When the pipeline is unconstrained:

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

[0026] The pipeline equation for high pressure, large flow, turbulent, unsteady flow modified by Brunone's additional friction model is:

[0027]

[0028] Among them, g is the acceleration of 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 diameter of the pipeline.

[0029] Furthermore, the calculation method of 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 position 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 power prediction model is used to calculate the position x where the maximum impact occurs, using the outlet pressure of the emulsion pump station and the amount of liquid used in the support obtained by the switch signal of the electromagnetic reversing valve of the hydraulic support as the boundary conditions. i and the pressure distribution function f(x i ,Δp,Δt),

[0033] Using the formula: Calculate the distance x from the maximum impact position to 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 Substituting 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, where 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. Based on 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 construction planning, the power supply capacity of the power supply is limited. The present device includes a power generation device, which can utilize the emulsion pump station to generate electricity. It does not require an external power supply to power the monitoring device on the pipeline, which is convenient for direct modification and use on the basis of existing working face equipment. At the same time, since 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 hydraulic support fluid supply system DETAILED DESCRIPTION

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

[0040] like Figure 1As shown, the present invention discloses an active monitoring system for a long pipeline liquid supply system of a hydraulic support, comprising 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 liquid inlet and return pipelines.

[0041] The liquid supply pipeline includes an emulsion pump station, a liquid inlet pipeline, a liquid return pipeline and a liquid system for a hydraulic support, wherein the emulsion pump station sucks liquid from a liquid tank into a long pipeline through a filter, from the liquid inlet pipeline to the liquid system for the support, and then from the liquid system for the support back to the liquid tank through the return oil pipeline of the long pipeline, wherein the liquid system for the hydraulic support includes an electro-hydraulic reversing valve and a hydraulic support, and 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.

[0042] like Figure 1 As shown, the liquid supply pipeline and the liquid return pipeline are divided into n segments according to the distance to the emulsion pump station, and the length of each segment is l i (i=1,2…,n), distance from pipeline to emulsion pump station The adjacent pipelines are connected via pipeline joints.

[0043] like Figure 1 The power generation device shown in the figure includes an accumulator, a proportional pressure valve, 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, proportional pressure valve 1 is in front of the accumulator, and proportional pressure valve 2 is behind the accumulator.

[0044] like Figure 1 As shown, the power generation device of the active monitoring method for the long pipeline fluid supply system of the hydraulic support supplies power to the monitoring device in the following manner:

[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 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.

[0046] like Figure 1 As shown, the monitoring device includes a pressure sensor, a vibration sensor, an acquisition card and a monitoring interface, wherein the pressure sensor is installed at the pipe joint of each pipe section to detect the front and rear pressures of each pipe section, and the vibration sensor is installed on the pipe surface of each pipe section to detect impact signals.

[0047] like Figure 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 the impact signal are collected by the acquisition card and displayed through the monitoring interface, which plays a 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 takes into account 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 working conditions. It can grasp the dynamic change law of the pressure of the support liquid supply system with long pipelines, high pressure and large flow, and strong time-varying load characteristics. It includes the high-pressure and large-flow turbulent non-steady flow pipeline equation corrected by the Brunone additional friction model:

[0051]

[0052] Among them, g is the acceleration of 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 diameter of the pipeline.

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

[0054]

[0055] where x i is the distance between the maximum impact position and the inlet position 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 (pipeline inlet pressure) and the liquid state of the hydraulic support end (hydraulic support electromagnetic reversing valve switch signal) are inputs, and the output is the position x where the maximum impact occurs. i and the pressure distribution function f(xi ,Δp,Δt), where x i The distance from the maximum impact position to 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 Substituting 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, where 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 fluid supply system.

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

[0059] Step 1: The emulsion pump station sucks the 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 fluid drives the hydraulic motor to rotate, driving the generator to charge the lithium battery, and the lithium battery powers 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 from the maximum impact position to the emulsion pump station x i Substituting 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 as to obtain the dangerous section that needs to be monitored, 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 of the maximum impact to realize active monitoring.

[0062] Step 4: The vibration sensors installed on the surface of each section of the long pipeline and the pressure sensors installed at the junction of the long pipeline actively monitor the location where the maximum impact occurs at the time when the maximum impact occurs based on the switch signal obtained in step 2, and transmit the pressure signal and impact signal to the acquisition card for display through the monitoring interface.

[0063] Step 5: 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 opens, 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 in that: The long pipeline fluid supply system of the hydraulic support includes an emulsion pump station for providing hydraulic power and a fluid system for the hydraulic support. The emulsion pump station and the fluid system for the hydraulic support are connected by a long pipeline. The long pipeline includes a fluid inlet pipeline and a fluid return pipeline. Both the fluid inlet pipeline and the fluid return pipeline are composed of multiple pipe sections connected end to end. The emulsion pump station sucks fluid from the fluid tank into the long pipeline through a filter, and then from the fluid inlet pipeline to the fluid system for the hydraulic support, and then from the fluid system for the hydraulic support to the fluid tank through the return oil pipeline of the long pipeline. The fluid system for the hydraulic support 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 the switch of 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 the pressure signal and impact signal of the liquid inlet and return pipeline, and a switch control device for predicting the maximum impact position and controlling the power generation device to supply power to the monitoring device at the maximum impact position; 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 the excess hydraulic energy of the long pipeline liquid supply system of the hydraulic support into electrical energy. The switch control device combines the outlet pressure monitoring data of the emulsion pump station and the switching signal of the reversing valve of the hydraulic support, and uses the long pipeline power transmission prediction model to calculate the pipe section on the liquid supply pipeline where the maximum impact occurs and the time when the maximum impact occurs. The pipe section on the liquid supply pipeline where the maximum impact occurs is recorded as the impact danger section, and the power supply of the monitoring device arranged on 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 adjusted, and the pressure of the accumulator is actively lowered through the proportional pressure valve 1 to achieve buffering at the liquid supply end.

2. The active monitoring system for the long pipeline fluid supply system of a 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 or not by a power supply circuit switch.

3. The active monitoring system for the long pipeline fluid supply system of a 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 fluid 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, and the length of each section is l i (i=1,2...,n), distance between the dangerous impact pipeline and the emulsion pump station Adjacent pipe sections are connected via pipe joints.

5. The active monitoring system for the long pipeline fluid supply system of a 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 through the acquisition card, and finally displayed and stored in the monitoring interface of the host computer.

6. A working method using 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 the proportional pressure valve 1, the proportional pressure valve 1 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 the proportional pressure valve 2, the 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: The outlet pressure and the switch signal of the electro-hydraulic reversing valve are detected by the pressure sensor at the outlet of the emulsion pump station. 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 x where the maximum impact occurs i Substituting 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, so as to obtain 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 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 occur, 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 fluid supply system of the hydraulic support.

7. The working method according to claim 6, characterized in that: In the monitoring interface, the pipe sections where the impact exceeds the set threshold are marked as dangerous sections, 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 the computer to match the long pipeline fluid supply system of the hydraulic support. The long pipeline dynamic prediction model is used to consider the influence of the turbulent state and strong time-varying load in the pipeline on the characteristics of the long pipeline, and the friction term is corrected according to the high-pressure, large-flow turbulent non-steady flow pipeline equation, so as to grasp the dynamic change law of the support fluid supply system with long pipelines, high-pressure, large-flow and strong time-varying load characteristics; the long pipeline dynamic prediction model uses the high-pressure, large-flow turbulent non-steady flow pipeline equation corrected 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 speed formula: When one end of the pipe is free: When all pipes are fixed: When the pipeline is unconstrained: Among them, K is the bulk elastic modulus, ρ is the emulsion density, e is the tube wall thickness, E is Young's modulus, and μ is Poisson's ratio; The pipeline equation for high pressure, large flow, turbulent, unsteady flow modified by Brunone's additional friction model is: Among them, g is the acceleration of 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 diameter of the pipeline.

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 position 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 power prediction model is used to calculate the position x where the maximum impact occurs, 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 the boundary conditions. i and the pressure distribution function f(x i ,Δp,Δt), Using the formula: Calculate the distance x from the maximum impact position to 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 Substituting 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, where Δt is the time when the maximum impact occurs.

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