Hydraulic support pressure maintaining system and stand column and safety valve state monitoring method

Abstract

The invention discloses a hydraulic support pressure maintaining system and a stand column and safety valve state monitoring method.The system comprises a hydraulic source, a hydraulic support stand column, a hydraulic control one-way valve and an electro-hydraulic reversing valve, and the hydraulic source provides emulsified liquid for a rodless cavity through the electro-hydraulic reversing valve, the hydraulic control one-way valve and a first pipeline; the rod cavity passes through the second pipeline and returns oil to the emulsion tank through the electro-hydraulic directional control valve; or the hydraulic source provides the emulsion for the rod cavity through the electro-hydraulic directional control valve and the second pipeline, and the rodless cavity returns oil to the emulsion tank through the first pipeline, the hydraulic control one-way valve and the electro-hydraulic directional control valve in sequence; a pressure sensor and an intelligent safety valve are arranged on the first pipeline; and an operation chip is arranged on the intelligent safety valve. According to the hydraulic support pressure maintaining system, the states of the stand column and the safety valve are monitored, abnormal conditions such as valve element clamping and system liquid leakage can be found in time, and the pressure relief flow of the safety valve can be given during normal work. And coal mine production workers are scientifically and efficiently assisted to complete equipment inspection tasks.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine comprehensive excavation tunnel support, and in particular to a hydraulic support pressure maintaining system and a column and safety valve status monitoring method. Background Art

[0002] The lower chamber of the hydraulic support column for coal mines (the name given by the coal industry, it is actually a large hydraulic cylinder, and the lower chamber represents the rodless chamber), the safety valve and the hydraulically controlled one-way valve form a pressure maintaining system. The pressure sensor is responsible for monitoring the pressure changes of the system. When the column is subjected to external load, the pressure in the lower chamber of the column will increase. When the pressure rises to the threshold of the safety valve, the safety valve will open. If the load continues at this time, the pressure in the lower chamber of the column will be maintained at the threshold of the safety valve. At this time, the safety valve plays the role of maintaining constant resistance in the lower chamber of the column. This shows the importance of the safety valve.

[0003] During actual use, safety valves and hydraulically controlled one-way valves may leak or open abnormally due to the use environment, use time or quality abnormalities. Pressure leakage may cause insufficient working resistance in the lower chamber of the column, or excessive pressure and failure of the safety valve to open may cause the column to expand, affecting safe production.

[0004] The existing technology lacks corresponding monitoring means, and basically checks the problem through manual inspection. After manual inspection, it is judged whether there is an abnormality, or the abnormality is discovered only after damage. The personnel input is large and there may be missed judgments and misjudgments. During manual inspection, it is difficult to find the safety valve core stuck, which may cause the column to expand and cause huge losses. In addition, it is also difficult to detect leakage in time through manual inspection. Leakage of the column will cause insufficient working resistance and affect the safety of coal mining. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and provide a hydraulic support pressure maintaining system and a method for monitoring the status of columns and safety valves. Through intelligent safety valves, pressure sensors and software strategies, the status of the lower cavity of the column can be monitored, the number of times the safety valve is opened and the pressure maintaining condition can be monitored, and safety valve abnormalities can be fed back.

[0006] In order to achieve the above object, the technical solution of the present invention is: A hydraulic support pressure maintaining system, comprising: A hydraulic source, providing emulsion to the hydraulic support column; The hydraulic support column bears the load of the top plate; it includes a rodless cavity of the hydraulic support column and a rod cavity of the hydraulic support; A hydraulically controlled one-way valve is arranged on the first pipeline of the rodless chamber to control the inflow and outflow of the emulsion in the rodless chamber to ensure the pressure of the rodless chamber; The electro-hydraulic reversing valve is arranged on the pipeline shared by the rodless chamber and the rod chamber, so that the hydraulic source provides emulsion to the rodless chamber through the electro-hydraulic reversing valve, the hydraulically controlled one-way valve and the first pipeline, and the rod chamber returns oil to the emulsion tank through the second pipeline and the electro-hydraulic reversing valve; or the hydraulic source provides emulsion to the rod chamber through the electro-hydraulic reversing valve and the second pipeline, so that the rodless chamber returns oil to the emulsion tank through the first pipeline and the hydraulically controlled one-way valve and the electro-hydraulic reversing valve in sequence; The first pipeline is provided with a pressure sensor and an intelligent safety valve to monitor the pressure state of the rodless chamber, and the pressure sensor and the intelligent safety valve are connected in parallel on the first pipeline; The hydraulically controlled one-way valve, pressure sensor and intelligent safety valve are connected to a controller, and the controller is electrically connected to a centralized control center; a computing chip is provided on the intelligent safety valve.

[0007] As an improvement to the above technical solution, the intelligent safety valve is a safety valve with an integrated displacement sensor, including a safety valve body and a displacement sensor integrated behind the safety valve body; The safety valve body comprises a hollow safety valve housing and a valve core which is arranged in the hollow inner cavity of the safety valve body and can move forward and backward; The displacement sensor includes an iron core, an induction coil surrounding the iron core and separated from the iron core by a gap so that an electromotive force is generated when the iron core moves, a hollow sensor housing, and a chip arranged in the hollow cavity of the sensor housing and electrically connected to the induction coil. A sensor probe is arranged at the front end of the iron core to measure the displacement of the valve core.

[0008] As an improvement to the above technical solution, the hollow cavity of the safety valve housing is a stepped hole, one end of which is a small-diameter axial hole, and the other end is a large-diameter spring seat mounting hole; a spring seat is arranged at the front end of the spring seat mounting hole, and a pressure regulating plug is installed at the rear end so that the safety valve spring is installed between the spring seat and the pressure regulating plug to adjust the elastic force of the safety valve spring on the spring seat, and the valve core passes through the axial hole and the rear end is in contact with the spring seat.

[0009] As an improvement to the above technical solution, a joint is provided at the front end of the valve core, and a rubber sleeve is provided at the outer periphery of the front end of the safety valve housing.

[0010] As an improvement to the above technical solution, rivets are riveted between the pressure regulating plug and the safety valve housing.

[0011] As an improvement to the above technical solution, a front cover with an opening and a measuring head shell installed at the front end of the front cover are installed at the front end of the sensor housing; a rear plug is provided at the rear end of the measuring head shell, and a front plug with an opening is provided at the front end; a pull rod is penetrated by the front plug, the sensor probe is provided at the front end of the pull rod, and the iron core is provided at the rear end of the pull rod; a built-in spring is provided at the periphery of the iron core, and the induction coil surrounds the periphery of the built-in spring and is separated from the built-in spring by a gap; the chip is provided at the rear end of the sensor housing and is electrically connected to the induction coil.

[0012] As an improvement to the above technical solution, a cover plate is installed at the rear end of the sensor housing.

[0013] As an improvement to the above technical solution, the peripheral opening of the sensor housing is used to embed a Hirschmann joint.

[0014] As an improvement to the above technical solution, the induction coil includes a primary coil and two secondary coils.

[0015] As an improvement to the above technical solution, the inner cavity of the front plug is provided with a copper sleeve to form a sliding fit with the pull rod.

[0016] As an improvement to the above technical solution, the present invention also provides a method for monitoring the status of a column and a safety valve based on the above hydraulic support pressure maintaining system, and the monitoring method comprises the following steps: S1, hydraulic support pressure-maintaining system works. Hydraulic support column maintains pressure and starts monitoring; S2, the intelligent safety valve monitors the displacement state of the internal valve core; the pressure sensor monitors the pressure state of the rodless chamber of the hydraulic cylinder, and sends the pressure state to the controller, which then sends it to the computing chip of the intelligent safety valve; S3. The computing chip determines the state of the pressure-maintaining system according to the displacement state of the valve core and the engineering data, and sends the determination result to the controller, which then sends it to the centralized control center.

[0017] As an improvement to the above technical solution, the determination method of step S3 is: S31. If the rodless chamber pressure of the hydraulic cylinder is greater than the safety valve threshold, and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that the intelligent safety valve may be abnormal, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, and then uploads it to the centralized control center for reference and analysis, and generates an alarm message; S32, if the rodless chamber pressure of the hydraulic cylinder continues to decrease and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that there may be leakage in the hydraulic support pressure-maintaining system, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, and then uploads it to the centralized control center for reference and analysis, and generates an alarm message; S33: If it is detected that the system pressure rises to the safety valve threshold and the valve core of the intelligent safety valve is displaced at this time, the controller determines that the system is normal.

[0018] As an improvement to the above technical solution, the monitoring frequency of the intelligent safety valve is 100 Hz.

[0019] As an improvement to the above technical solution, the leakage refers to column leakage, control valve leakage or safety valve leakage.

[0020] The working principle of this application is: when the system is in a pressure-maintaining state, the intelligent safety valve remains in a working state, and the displacement of the valve core of the intelligent safety valve is monitored in real time. The monitoring frequency is maintained at 100 Hz per second. The pressure sensor monitors the pressure in the lower cavity of the hydraulic support column in real time, and sends pressure data to the intelligent safety valve once a second. If the pressure continues to rise and exceeds the threshold, the intelligent safety valve responds and packages this segment of data and sends it to the controller.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects: The invention can monitor the hydraulic support pressure-maintaining system in real time through the coordination of displacement sensors, pressure sensors and software strategies for safety valves, timely detect abnormal conditions such as valve core jams and system leakage, and provide the safety valve pressure relief flow rate during normal operation, thus scientifically and efficiently assisting coal mine production workers to complete equipment inspection tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the overall structure of the intelligent safety valve of the present invention; Figure 2 It is a structural schematic diagram of the built-in spring sensor of the present invention; Figure 3 It is a schematic diagram of the composition of the pressure-maintaining system of the present invention; Figure 4 It is a schematic diagram of the logical steps of the method for monitoring the status of a column and a safety valve of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0025] like Figure 1 , 2 As shown in Figure 3, the hydraulic support pressure maintaining system of the present invention comprises: A hydraulic source 3, providing emulsion to the hydraulic support column; The hydraulic support column 8 bears the load of the top plate; it includes a rodless cavity of the hydraulic support column and a rod cavity of the hydraulic support; The hydraulically controlled one-way valve 6 is arranged on the first pipeline of the rodless chamber to control the inflow and outflow of the emulsion in the rodless chamber and play a role in maintaining pressure; The electro-hydraulic reversing valve 4 is arranged on the pipeline shared by the rodless chamber and the rod chamber, so that the hydraulic source 3 provides emulsion to the rodless chamber through the electro-hydraulic reversing valve 4, the hydraulically controlled one-way valve 6 and the first pipeline, and the rod chamber returns oil to the emulsion tank 10 through the second pipeline and the electro-hydraulic reversing valve 4; or the hydraulic source 3 provides emulsion to the rod chamber through the electro-hydraulic reversing valve 4 and the second pipeline, so that the rodless chamber returns oil to the emulsion tank 10 through the first pipeline and the hydraulically controlled one-way valve 6 and the electro-hydraulic reversing valve 4 in sequence; The first pipeline is provided with a pressure sensor 7 and an intelligent safety valve 5 to monitor the pressure state of the rodless chamber, and the pressure sensor 7 and the intelligent safety valve 5 are connected in parallel on the first pipeline; The hydraulically controlled one-way valve 6 , the pressure sensor 7 , and the intelligent safety valve 5 are connected to the controller 2 , and the controller 2 is electrically connected to the centralized control center 1 ; and a computing chip is provided on the intelligent safety valve 5 .

[0026] The intelligent safety valve 5 of the present invention comprises a safety valve body and a displacement sensor integrated behind the safety valve body; The safety valve body comprises a hollow safety valve housing 11 and a valve core 12 disposed in the hollow inner cavity of the safety valve body 11 and capable of moving forward and backward; The displacement sensor includes an iron core 14, an induction coil 15 surrounding the iron core 14 and separated from the iron core 14 by a gap so that an electromotive force is generated when the iron core 14 moves, a hollow sensor housing 13, and a chip 16 arranged in the hollow cavity of the sensor housing 13 and electrically connected to the induction coil 15. A sensor probe 17 is arranged at the front end of the iron core 14 to measure the displacement of the valve core 12.

[0027] The hollow cavity of the safety valve housing 11 is a stepped hole, one end of which is a small-diameter shaft hole, and the other end is a large-diameter spring seat mounting hole; a spring seat 18 is arranged at the front end of the spring seat mounting hole, and a pressure regulating plug 19 is installed at the rear end so that the safety valve spring 20 is installed between the spring seat 18 and the pressure regulating plug 19 to adjust the elastic force of the safety valve spring 20 on the spring seat 18, and the valve core 12 passes through the shaft hole and the rear end contacts the spring seat 18. A joint 22 is arranged at the front end of the valve core 12, and a rubber sleeve 21 is arranged on the outer periphery of the front end of the safety valve housing 11. Rivets 23 are riveted between the pressure regulating plug 19 and the safety valve housing 11.

[0028] The front end of the sensor housing 13 is installed with a front cover 24 with an opening and a measuring head housing 25 installed at the front end of the front cover 24; the rear end of the measuring head housing 25 is provided with a rear plug 26, and the front end is provided with a front plug 27 with an opening; the front plug 27 is penetrated by a pull rod 28, the sensor probe 17 is arranged at the front end of the pull rod 28, and the iron core 14 is arranged at the rear end of the pull rod 28; the periphery of the iron core 14 is provided with an internal spring 29, and the induction coil 15 surrounds the periphery of the internal spring 29 and is separated from the internal spring 29 by a gap; the chip 16 is arranged at the rear end of the sensor housing 13 and is electrically connected to the induction coil 15. The rear end of the sensor housing 11 is installed with a cover plate 30. The periphery of the sensor housing 11 is opened to embed a Hirschmann joint 31. The induction coil 15 includes a primary coil and two secondary coils.

[0029] The inner cavity of the front plug 27 is provided with a copper sleeve 32 to form a sliding fit with the pull rod 28 .

[0030] The intelligent safety valve 5 integrates a displacement sensor behind the safety valve and collects valve core displacement data using the LVDT principle. The displacement data of the valve core of the safety valve can be read and recorded. The working state of the safety valve can be detected by calculating the displacement data and pressure data. Finally, the working state information, displacement data information and time information of the safety valve are transmitted to the outside through the Hirschmann connector.

[0031] First, the opening pressure of the intelligent safety valve is set at the factory, and the opening pressure value is written into the controller; in the pressure-maintaining system, the hydraulic source continuously supplies fluid; when the electro-hydraulic reversing valve is energized in the left position, it is unidirectionally conducted into the lower chamber of the column (the rodless chamber of the hydraulic cylinder) through the hydraulically controlled one-way valve, and the column rises and contacts the roof (the top of the coal mine working face, which can be regarded as a load), causing the electro-hydraulic reversing valve to lose power, and the electro-hydraulic reversing valve returns to the middle position and no longer supplies fluid to the column; the hydraulically controlled one-way valve is reset, and the column is in a pressure-maintaining state; 10 seconds later, the intelligent safety valve begins to monitor the internal valve core displacement state, and the pressure sensor continuously monitors the pressure state of the lower chamber of the column and sends the data to the controller; at this time, the pressure-maintaining system state is judged according to the software strategy, an alarm is issued, and the data at the corresponding time point is recorded; when the electro-hydraulic reversing valve is energized in the right position, fluid enters the upper chamber of the column (the rod chamber of the hydraulic cylinder), fluid returns to the lower chamber of the column, and the column descends. At this stage, the system suspends judging abnormal conditions.

[0032] The intelligent safety valve adjusts the opening pressure of the safety valve by adjusting the compression of the spring (this pressure value is the threshold value of the intelligent safety valve). The safety valve connector is connected to the hydraulic system. When the pressure of the hydraulic system connected to it reaches the opening pressure of the safety valve, the valve core overcomes the spring force and moves. The hole on the valve core passes over the sealing ring to achieve the purpose of pressure relief. When the valve core moves, it also pushes the spring seat to move, thereby causing the displacement sensor in contact with the spring seat to move. When the front end of the displacement sensor moves, the displacement generated will be recorded at a frequency of 100 times per second and processed according to the software logic.

[0033] like Figure 3 and 4 As shown, the present invention also provides a method for monitoring the status of a column and a safety valve based on the above hydraulic support pressure maintaining system, and the monitoring method comprises the following steps: S1, hydraulic support pressure-maintaining system works. Hydraulic support column maintains pressure and starts monitoring; S2, the intelligent safety valve monitors the displacement state of the internal valve core; the pressure sensor monitors the pressure state of the rodless chamber of the hydraulic cylinder, and sends the pressure state to the controller, which then sends it to the computing chip of the intelligent safety valve; S3. The computing chip determines the state of the pressure-maintaining system according to the displacement state of the valve core and the engineering data, and sends the determination result to the controller, which then sends it to the centralized control center.

[0034] The determination method of step S3 is: S31. If the rodless chamber pressure of the hydraulic cylinder is greater than the safety valve threshold (i.e., the opening pressure of the safety valve), and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that the intelligent safety valve may be abnormal, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, which is then uploaded to the centralized control center for reference and analysis, and generates an alarm message; S32, if the rodless chamber pressure of the hydraulic cylinder continues to decrease and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that there may be leakage in the hydraulic support pressure-maintaining system, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, and then uploads it to the centralized control center for reference and analysis, and generates an alarm message; S33: If it is detected that the system pressure rises to the safety valve threshold and the valve core of the intelligent safety valve is displaced at this time, the controller determines that the system is normal.

[0035] The monitoring frequency of the intelligent safety valve is 100 Hz. The leakage refers to column leakage, control valve leakage or safety valve leakage.

[0036] The above software logic is: When the system is in the pressure-maintaining state, the intelligent safety valve remains in working state and monitors the displacement of the safety valve core in real time. It maintains a monitoring frequency of 100 Hz per second. The pressure sensor monitors the pressure in the lower cavity of the column in real time and sends pressure data to the intelligent safety valve once a second. If the pressure continues to rise and exceeds the threshold, the intelligent safety valve responds and packages this section of data and sends it to the controller.

[0037] If the detected pressure is greater than the safety valve threshold and the displacement of the safety valve core has not changed, the system will determine that there may be an abnormality in the safety valve, and will package and upload the data 5 seconds before and after this time for reference and analysis, and the system will generate an alarm.

[0038] If it is detected that the pressure continues to decrease and the displacement of the safety valve core does not change, the system will determine that there is a possibility of leakage, and will package and upload the data 5 seconds before and after this time, and the system will generate an alarm message.

[0039] If it is detected that the system pressure rises to the safety valve threshold and the safety valve core is displaced at this time, this state is normal. The flow rate of the safety valve opening and discharging at this time can be calculated based on the simulation data.

[0040] The present invention can realize real-time monitoring of the column pressure-maintaining system through the coordination of displacement sensors, pressure sensors and software strategies for safety valves, timely discover abnormal conditions such as valve core jams and system leakage, and provide the safety valve pressure relief flow rate during normal operation. The present invention scientifically and efficiently assists coal mine production workers in completing equipment inspection tasks.

[0041] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A hydraulic support pressure maintaining system, characterized in that: include: A hydraulic source, providing emulsion to the hydraulic support column; Hydraulic support columns bear the load of the top plate; It includes a rodless cavity of a hydraulic support column and a rod cavity of a hydraulic support; A hydraulically controlled one-way valve is arranged on the first pipeline of the rodless chamber to control the inflow and outflow of the emulsion in the rodless chamber; The electro-hydraulic reversing valve is arranged on the pipeline shared by the rodless chamber and the rod chamber, so that the hydraulic source provides emulsion to the rodless chamber through the electro-hydraulic reversing valve, the hydraulically controlled one-way valve and the first pipeline, and the rod chamber returns oil to the emulsion tank through the second pipeline and the electro-hydraulic reversing valve; or the hydraulic source provides emulsion to the rod chamber through the electro-hydraulic reversing valve and the second pipeline, so that the rodless chamber returns oil to the emulsion tank through the first pipeline and the hydraulically controlled one-way valve and the electro-hydraulic reversing valve in sequence; The first pipeline is provided with a pressure sensor and an intelligent safety valve to monitor the pressure state of the rodless chamber, and the pressure sensor and the intelligent safety valve are connected in parallel on the first pipeline; The hydraulically controlled one-way valve, pressure sensor and intelligent safety valve are connected to a controller, and the controller is electrically connected to a centralized control center; a computing chip is provided on the intelligent safety valve.

2. The hydraulic support pressure maintaining system according to claim 1, characterized in that: The intelligent safety valve is a safety valve with an integrated displacement sensor, comprising a safety valve body and a displacement sensor integrated behind the safety valve body; The safety valve body comprises a hollow safety valve housing and a valve core which is arranged in the hollow inner cavity of the safety valve body and can move forward and backward; The displacement sensor includes an iron core, an induction coil surrounding the iron core and separated from the iron core by a gap so that an electromotive force is generated when the iron core moves, a hollow sensor housing, and a chip arranged in the hollow cavity of the sensor housing and electrically connected to the induction coil. A sensor probe is arranged at the front end of the iron core to measure the displacement of the valve core.

3. The hydraulic support pressure maintaining system as claimed in claim 2, characterized in that: The hollow cavity of the safety valve housing is a stepped hole, one end of which is a small-diameter axial hole and the other end is a large-diameter spring seat mounting hole; a spring seat is arranged at the front end of the spring seat mounting hole and a pressure regulating plug is installed at the rear end so that the safety valve spring is installed between the spring seat and the pressure regulating plug to adjust the elastic force of the safety valve spring on the spring seat, and the valve core passes through the axial hole and the rear end is in contact with the spring seat.

4. The hydraulic support pressure maintaining system as claimed in claim 3, characterized in that: A joint is arranged at the front end of the valve core, and a rubber sleeve is arranged on the outer periphery of the front end of the safety valve housing; rivets are riveted between the pressure regulating plug and the safety valve housing.

5. The hydraulic support pressure maintaining system according to claim 2, characterized in that: A front cover with an opening and a measuring head shell installed at the front end of the front cover are installed at the front end of the sensor housing; a rear plug is provided at the rear end of the measuring head shell, and a front plug with an opening is provided at the front end; a pull rod is penetrated by the front plug, the sensor probe is provided at the front end of the pull rod, and the iron core is provided at the rear end of the pull rod; a built-in spring is provided at the periphery of the iron core, and the induction coil surrounds the periphery of the built-in spring and is separated from the built-in spring by a gap; the chip is provided at the rear end of the sensor housing and is electrically connected to the induction coil.

6. The hydraulic support pressure maintaining system as claimed in claim 5, characterized in that: A cover plate is installed at the rear end of the sensor housing; and the peripheral portion of the sensor housing is opened to embed a Hirschmann joint.

7. The hydraulic support pressure maintaining system as claimed in claim 5, characterized in that: The induction coil includes a primary coil and two secondary coils; the inner cavity of the front plug is provided with a copper sleeve to form a sliding fit with the pull rod.

8. A method for monitoring the status of a column and a safety valve of a hydraulic support pressure maintaining system according to any one of claims 1 to 7, characterized in that: The monitoring method comprises the following steps: S1. Maintain the pressure of the hydraulic support column and start monitoring; S2, the intelligent safety valve monitors the displacement state of the internal valve core; the pressure sensor monitors the pressure state of the rodless chamber of the hydraulic cylinder, and sends the pressure state to the controller, which then sends it to the computing chip of the intelligent safety valve; S3. The computing chip determines the state of the pressure-maintaining system according to the valve core displacement state and engineering data, and sends the determination result to the controller, which then sends it to the centralized control center.

9. The monitoring method according to claim 8, characterized in that: The determination method of step S3 is: S31. If the rodless chamber pressure of the hydraulic cylinder is greater than the safety valve threshold, and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that the intelligent safety valve may be abnormal, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, and then uploads it to the centralized control center for reference and analysis, and generates an alarm message; S32, if the rodless chamber pressure of the hydraulic cylinder continues to decrease and the valve core displacement of the intelligent safety valve does not change, the computing chip determines that there may be leakage in the hydraulic support pressure-maintaining system, and packages and uploads the data of the intelligent safety valve before and after 5 seconds to the controller, and then uploads it to the centralized control center for reference and analysis, and generates an alarm message; S33: If it is detected that the system pressure rises to the safety valve threshold and the valve core of the intelligent safety valve is displaced at this time, the controller determines that the system is normal.

10. The monitoring method according to claim 8, characterized in that: The monitoring frequency of the intelligent safety valve is 100 Hz; the leakage refers to column leakage, control valve leakage or safety valve leakage.

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