CN111911214B - Method for monitoring working state of safety valve of hydraulic support - Google Patents
Method for monitoring working state of safety valve of hydraulic support Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 56
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- 238000005065 mining Methods 0.000 abstract description 2
- 230000003245 working effect Effects 0.000 abstract description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/46—Telescopic props with load-measuring devices; with alarm devices
- E21D15/465—Telescopic props with load-measuring devices; with alarm devices with essential hydraulic or pneumatic details
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The application discloses a method for monitoring the working state of a safety valve of a hydraulic support, which relates to the technical field of coal mine safety mining, wherein the method comprises the following steps: the pressure state of the hydraulic support upright column of the coal mine working face is monitored in real time, so that pressure change data of the hydraulic support upright column are obtained; and determining the working state of the safety valve of the hydraulic support column on the coal mine working face according to the pressure change data of the hydraulic support column and the working characteristics of the safety valve of the hydraulic support column. Through the technical scheme of this application, carry out real-time supervision to colliery working face hydraulic support pressure, can obtain hydraulic support working resistance variation conditions comprehensively to according to relief valve operating condition, obtain colliery working face hydraulic support relief valve open pressure and long time, thereby reach the purpose that whether evaluation hydraulic support working property, roof come pressure state, relief valve damage.
Description
Technical Field
The application relates to the technical field of coal mine safety mining, in particular to a method for monitoring the working state of a safety valve of a hydraulic support.
Background
The hydraulic support is a device for supporting a top plate and a bottom plate of a coal face in coal mine production, is used for isolating the face from a goaf and plays an important role in ensuring the safety of equipment and personnel in a stoping face, and a safety valve of a vertical column of the hydraulic support is a core element for protecting the hydraulic support from exceeding rated working resistance to realize overload protection, and the main parameters of the safety valve include opening pressure, opening duration and the like.
The design rated support strength (working resistance) of the hydraulic support is determined by the cylinder diameter of the upright columns of the support, the number of the upright columns and the opening pressure of the safety valve. When the safety valve is used in a field, the opening pressure of the safety valve determines whether the support can play a role of effectively supporting the top plate, when the opening pressure of the safety valve is greater than a set value, the stand column emulsion cannot overflow in time and cannot play a role of protecting the support, and a support structural member is damaged; when the opening pressure of the safety valve is smaller than a set value, the support cannot effectively support the top plate of the working face, the sinking amount of the top plate is large, and the top plate disaster is easy to occur. In addition, the opening duration of the safety valve is also one of important indexes for evaluating the mine pressure display strength of the working face roof and whether the support can meet the supporting requirement of the working face. Therefore, timely analysis of the opening pressure and the opening duration of the safety valve of the support is important content for working face top plate management.
At present, the opening pressure of the safety valve is monitored in a mode of detaching the safety valve from a support in order to analyze the opening pressure and the opening time of the safety valve of the support in time, namely, a special monitoring system is adopted on the ground for relevant monitoring, time and labor are wasted, and the actual opening pressure and the opening time of the safety valve in a coal mine underground in a working state cannot be reflected. Therefore, the monitoring of the working state of the safety valve is the basis for ensuring the actual opening pressure and the opening time accuracy of the safety valve in the underground coal mine, namely the monitoring of the working state of the safety valve is realized without an effective technical means in the underground coal mine.
Disclosure of Invention
In view of the above, the application provides a method for monitoring the working state of a safety valve of a hydraulic support, and mainly aims to solve the problems that the conventional safety valve of the hydraulic support needs to adopt a special monitoring system on the ground for monitoring the opening pressure, wastes time and labor, cannot reflect the actual opening pressure and the opening duration of the safety valve in the working state of the safety valve in a coal mine, and cannot realize the monitoring of the working state of the safety valve in a well by an effective technical means.
According to the application, the method for monitoring the working state of the safety valve of the hydraulic support comprises the following steps:
the pressure state of the hydraulic support upright column of the coal mine working face is monitored in real time, so that pressure change data of the hydraulic support upright column are obtained;
and determining the working state of the safety valve of the hydraulic support column on the coal mine working face according to the pressure change data of the hydraulic support column and the working characteristics of the safety valve of the hydraulic support column.
By means of the technical scheme, the application provides a method for monitoring the working state of the safety valve of the hydraulic support, and compared with the scheme that the existing safety valve of the hydraulic support needs to adopt a special monitoring system on the ground for monitoring the opening pressure, the method obtains the pressure change data of the hydraulic support stand column by monitoring the pressure state of the hydraulic support stand column of the coal mine working face in real time; and determining the working state of the safety valve of the hydraulic support column on the coal mine working face according to the pressure change data of the hydraulic support column and the working characteristics of the safety valve of the hydraulic support column. The working state of the safety valve of the hydraulic support stand column on the coal mine working face can be determined by combining the working characteristics of the safety valve of the hydraulic support stand column on the basis of monitoring the pressure of the hydraulic support stand column in the coal mine, so that the actual opening pressure and the opening time of the safety valve in the working state are further determined, and the actual working condition of the safety valve in the coal mine working process is accurately reflected.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart illustrating a method for monitoring an operating state of a safety valve of a hydraulic bracket according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating another method for monitoring the working state of a safety valve of a hydraulic support according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a hydraulic support provided by an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a hydraulic support column provided by an embodiment of the present application;
FIG. 5 is a graph illustrating pressure variation data of a hydraulic support column provided by an embodiment of the present application;
fig. 6 is a graph diagram illustrating another pressure variation data of the hydraulic support column provided by the embodiment of the application.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The problem of current do not have effectual technological means to realize the monitoring to the relief valve state of opening in the pit is solved. The embodiment provides a method for monitoring the working state of a safety valve of a hydraulic support, which can monitor pressure change data of a hydraulic support stand column under a coal mine, and determine the working state of the safety valve of the hydraulic support stand column on a coal mine working surface by combining the working characteristics of the safety valve of the hydraulic support stand column, thereby further determining the actual opening pressure and the actual opening time of the safety valve in the working state and accurately reflecting the actual working condition of the safety valve in the working process of the coal mine. As shown in fig. 1, the method includes:
In this embodiment, in the coal mine working face extraction process, the pressure sensor is used for monitoring the pressure of the hydraulic support stand column in real time, and the monitored pressure data is transmitted to the ground mine pressure monitoring system in real time through an optical cable or an electric cable, so that the pressure change of the hydraulic support stand column is monitored in real time. In addition, the working resistance change condition of the hydraulic support can be comprehensively acquired according to the pressure change data of the hydraulic support upright column, and the working state of the safety valve of the hydraulic support on the coal mine working face, the actual opening pressure and the actual opening duration of the safety valve in the working state are determined by combining the working characteristics of the safety valve.
And 102, determining the working state of the hydraulic support column safety valve on the coal mine working surface according to the pressure change data of the hydraulic support column and the working characteristics of the hydraulic support column safety valve.
In the embodiment, according to the pressure change data of the hydraulic support stand column and the working characteristics of the safety valve, the working state of the safety valve and the actual opening pressure and the actual opening duration of the safety valve in the working state are automatically identified, so that the aims of evaluating the working performance of the hydraulic support, the pressure coming state of the top plate and whether the safety valve is damaged are fulfilled.
By applying the technical scheme of the embodiment, compared with the scheme that the existing hydraulic support safety valve needs to adopt a special monitoring system on the ground for monitoring the opening pressure, the embodiment monitors the pressure state of the hydraulic support upright post on the coal mine working face in real time to obtain the pressure change data of the hydraulic support upright post; and determining the working state of the safety valve of the hydraulic support column on the coal mine working face according to the pressure change data of the hydraulic support column and the working characteristics of the safety valve of the hydraulic support column. Therefore, the pressure change data of the hydraulic support stand column can be monitored in the underground coal mine, the working state of the hydraulic support stand column safety valve on the working face of the coal mine is determined by combining the working characteristics of the hydraulic support stand column safety valve, the actual opening pressure and the opening time of the safety valve in the working state are further determined, and the actual working condition of the safety valve in the underground coal mine working is accurately reflected.
Further, as a refinement and an extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of the embodiment, another method for monitoring the opening state of the safety valve of the hydraulic bracket is provided, as shown in fig. 2, the method includes:
In specific implementation, a sensor is used for monitoring the pressure state of the emulsion in the hydraulic support stand column in real time, and pressure change data of the hydraulic support stand column within preset time is obtained according to the pressure state of the emulsion. As shown in fig. 3 and 4, the hydraulic support includes a support front column 301, a support rear column 302, and a sensor 303 (e.g., a pressure sensor) disposed on the side of the column outer cylinder for monitoring the pressure of the emulsion in the column, and further, the column is mainly composed of a rod 401, an outer cylinder 402, a safety valve 403, a sensor 404, and the like, and the emulsion 405 is filled in the column. According to the needs of the practical application scenario, the number of the columns is not specifically limited, the sensor may be a pressure sensor or a stress sensor, and the type and model of the sensor are not specifically limited here.
Further, the sensor monitors the pressure state of the emulsion in the column to obtain pressure change data within a certain period of time, as shown in fig. 5, the pressure change data are respectively the pressure change data of the front column and the rear column, and the monitoring of the working state of the safety valve by the sensor is realized by combining the characteristics that the fluctuation and the change of the emulsion pressure are influenced by the opening and the closing of the safety valve of the column, namely the opening and the closing characteristics of the safety valve of the column, so that the working resistance and the supporting strength of the support are further reflected.
The working resistance of the bracket refers to the supporting force reflected by the pressure of the top plate when the bracket is in a working state. The calculation formula of the working resistance of the bracket is as follows:
in the formula, F is the working resistance of the bracket, kN; n is the number of the stand columns of the bracket; p is column pressure, MPa; d is the diameter of the vertical column cylinder, m.
The support strength of the support refers to the support resistance received by the unit area of the top plate in the range of the support top control area, and the calculation formula of the support strength is as follows:
in the formula, q is the support strength of the bracket, and is MPa; f is the working resistance of the bracket, kN; a is the area of the top of the stent, m2。
In specific implementation, before the pressure change data of the hydraulic support stand column is judged, whether the pressure change data of the hydraulic support stand column meets the time requirement or not and whether the pressure data contained in the pressure change data meets the quantity requirement or not are judged. And if the time requirement and the quantity requirement are met, further judging whether the pressure difference value between adjacent monitoring time points in the pressure change data of the hydraulic support stand column meets a first preset condition.
And 203, determining the working state of the hydraulic support column safety valve on the coal mine working face according to the judgment result and the working characteristics of the hydraulic support column safety valve.
In specific implementation, it is assumed that pressure data of the emulsion is recorded every 0.5min within a time period t, pressure data of n stand columns are obtained through monitoring, and according to a time sequence, each pressure data is recorded as P in sequencei(i is 1 to n). And judging whether the n upright post pressure data obtained by monitoring can meet preset conditions, if so, determining that the working state of the upright post safety valve is an open state, otherwise, determining that the working state of the upright post safety valve is a closed state.
In the foregoing embodiment, to illustrate the specific implementation process of steps 202 and 203, as an optional manner, the method specifically includes:
according to the opening characteristic of the safety valve of the hydraulic support column, if the pressure change data of the hydraulic support column is within the pressure threshold range, determining that the working state of the safety valve of the hydraulic support column on the coal mine working face is an opening state;
and according to the closing characteristic of the hydraulic support column safety valve, if the pressure change data of the hydraulic support column is greater than or equal to or less than or equal to the pressure threshold value, determining that the working state of the hydraulic support column safety valve on the coal mine working face is a closing state.
In a specific implementation, as shown in FIG. 6, the data P is the pressure data of the rear columniAnd rear column mean pressure data AiA graph of pressure change data of (a). As is known from the operating characteristics of the safety valve, i.e., the opening and closing principle, if the column pressure variation data fluctuates around a certain pressure specific value (e.g., average pressure data) over a period of time, it indicates that the safety valve is in an open state, and if the column pressure variation data always remains above or below the average pressure data (i.e., equal to or greater than or equal to or less than the average pressure data) over a period of time, it indicates that the safety valve is in an unopened state. It should be noted that, in the method for determining whether the safety valve is in the open state, a pressure fluctuation threshold may be set, and the safety valve may be determined to be in the open state by making the pillar pressure variation data fluctuate around a certain pressure specific value (for example, average pressure data) and ensuring that the pillar pressure variation data within a certain period of time is within a range of the average pressure data ± the pressure fluctuation threshold.
In the foregoing embodiment, in order to illustrate a specific implementation process of step 202, as an optional manner, the step 202 specifically includes:
2021, calculating a pressure difference value between adjacent monitoring time points to be B according to pressure change data of the hydraulic support upright columni＝Pi-Pi-1The pressure change data comprises pressure data P in sequence according to time sequencei，i＝1～n。
Step 2022, determining whether the calculated pressure differences are all within a preset pressure difference range.
Step 2023, if the pressure difference values are all within the preset pressure difference value range, acquiring the number of the pressure difference values larger than 0 and the number of the pressure difference values smaller than 0, and judging whether the first preset condition is met according to the acquired result.
In the foregoing embodiment, as an optional manner, the acquiring the number of pressure difference values greater than 0 and the number of pressure difference values less than 0, and determining whether the first preset condition is met according to the acquired result specifically includes:
when the pressure difference values comprise pressure difference values larger than 0 and pressure difference values smaller than 0, judging whether the difference value between the pressure difference value quantity larger than 0 and the pressure difference value quantity smaller than 0 is within a comparison threshold value range or not;
if the difference value is within the comparison threshold range, pressure data continuously greater than or equal to 0, pressure data continuously less than or equal to 0 and pressure data continuously equal to 0 are obtained, and whether a first preset condition is met or not is judged according to the obtained result.
Further, as an optional mode, the acquiring pressure data continuously greater than or equal to 0, pressure data continuously less than or equal to 0, and pressure data continuously equal to 0, and determining whether the first preset condition is met according to the acquired result specifically include:
if the obtained pressure data quantity continuously greater than or equal to 0, the obtained pressure data quantity continuously less than or equal to 0 and the obtained pressure data quantity continuously equal to 0 are respectively less than or equal to corresponding quantity thresholds, a first preset condition is met, otherwise, the first preset condition is not met; alternatively, the first and second electrodes may be,
if the obtained pressure data accumulated values which are continuously greater than or equal to 0 and the obtained pressure data accumulated values which are continuously less than or equal to 0 respectively meet the corresponding preset accumulated value range, and the quantity of the pressure data which are continuously equal to 0 is less than or equal to the corresponding quantity threshold value, a first preset condition is met, otherwise, the first preset condition is not met.
In specific implementation, if the following 5 conditions are simultaneously met, it is determined that the safety valve is in an open state, and if any one of the conditions is not met, it is determined that the safety valve is in a closed state, where the conditions for determining the working state of the safety valve are specifically:
(1) monitoring pressure data within a certain time after the initial supporting force of the hydraulic support upright column is generated, wherein the monitoring time t is generally not less than 10min and contains n (n is greater than 4) pieces of pressure data;
(2) calculating the pressure difference between two pressure data between adjacent monitoring time points, and recording as Bi＝Pi-Pi-1According to a plurality of pressure differences BiAbsolute value of | BiI, determine absolute value | BiWhether | is within the preset pressure difference value range, namely, the absolute value | B is satisfiediLess than or equal to 3MPa and represents an absolute value | BiAnd | is within a preset pressure difference value range. According to the requirements of practical application scenes, a plurality of pressure difference values B can be obtainediJudging whether the pressure is in a preset pressure difference range, namely, B is more than or equal to-3 MPaiLess than or equal to 3MPa, represents BiWithin the preset pressure difference range, the preset pressure difference range is not specifically limited.
(3) Obtaining a pressure difference value B according to n pressure data in a certain timei>Total number of 0 s, denoted as K (B)i>0) Differential pressure Bi<Total number of 0 s, denoted as M (B)i<0) Wherein K and M are not equal to 0, that is, if K is equal to 0, it indicates that the pressure data shows a descending trend, and the safety valve is in an unopened state; if M is equal to 0, the pressure data shows an increasing trend, and the safety valve is in an unopened state.
Further, the absolute value of the difference between K and M should satisfy the following condition: judging | K-M | < ═ F, wherein F is a comparison threshold, and if n is 5-8, F is 4; if n is 8-12, F is 7; if n is greater than 12, F is 0.7 n/2. According to the requirements of the actual application scene, whether the difference value between K and M is within the comparison threshold range can be judged, namely, the comparison threshold is not specifically limited, wherein K is not more than F, and M is not more than F.
(4) Obtaining a pressure difference value B according to n pressure data in a certain timeiThe number of pressure data continuously occurring is greater than or equal to 0 and is marked as K0(Bi>0) and the accumulated value is recorded as
Pressure difference BiThe number of pressure data, denoted M, occurring successively is less than or equal to 00(Bi<0), the accumulated value is recorded as
Pressure difference BiThe number of consecutive occurrences of pressure data equal to 0, denoted L (B)i0). Judging whether the following conditions are met according to the acquisition result: judgment of K0<8 or
M0<8 or
L<If the above conditions are simultaneously satisfied, the safety valve is determined to be in the open state.
For example, if the pressure difference value B is obtainediHas a partial sequence of-0.1, 0, 0.2, 0, 0.3, 0.6 or-1.1, then K0Is 6, the accumulated value thereof
Is 1.1, i.e. satisfies K0<8 or
If the obtained pressure difference value BiHas a partial sequence of 3, 0, -0.2, 0, -0.3, 0.6, then M0Is 5, its accumulated value
Namely, satisfy M0<8 or
If the obtained pressure difference value BiHas a partial sequence of 3, 0, 0.6, then L is 5, i.e., L is satisfied<＝6。
In the foregoing embodiment, in order to illustrate a specific implementation process of step 203, as an optional manner, step 203 specifically includes:
step 2031, if the pressure difference value meets a preset condition, determining that the working state of the hydraulic support column safety valve of the coal mine working face is an open state according to the working characteristics of the hydraulic support column safety valve.
Step 2032, if the pressure difference does not meet the preset conditions, determining the working state of the safety valve of the hydraulic support column of the coal mine working face to be a closed state according to the working characteristics of the safety valve of the hydraulic support column.
And 204, determining the opening pressure and the opening duration of the hydraulic support column safety valve according to the opening state of the hydraulic support column safety valve.
In specific implementation, as shown in fig. 6, when the open state of the safety valve is determined by the above-mentioned determination method, the first pressure data of the hydraulic support column at that time is recorded and used as the open pressure of the hydraulic support column safety valve, and the first current time is recorded and used as the open time of the hydraulic support column safety valve, the working state of the safety valve is continuously determined, when the working state of the safety valve is determined to be changed from the open state to the closed state, the second pressure data of the hydraulic support column at that time is recorded and the second current time is recorded and used as the close time of the hydraulic support column safety valve, and the open time of the hydraulic support column safety valve is obtained by calculating the difference between the close time and the open time.
According to the requirement of an actual application scenario, the opening pressure of the hydraulic support column safety valve may also be a difference value between the second pressure data and the first pressure data, and the calculation principle of the opening pressure of the hydraulic support column safety valve is not specifically limited here.
Correspondingly, the opening pressure standard value and the opening time standard value of the hydraulic support upright post safety valve are set so as to determine the quality of the working performance of the hydraulic support, the condition whether the pressure coming from the top plate is abnormal or not and the damage of the safety valve or not by comparing the opening pressure standard value and/or the opening time standard value with the actual opening pressure and/or the actual opening time of the hydraulic support upright post safety valve, thereby realizing the intelligent judgment of the evaluation of the quality of the working performance of the hydraulic support, the condition whether the pressure coming from the top plate is abnormal or not, the damage of the safety valve and the like.
In the foregoing embodiment, in order to illustrate a specific implementation process of step 205, as an optional manner, the step 205 specifically includes:
and 2051, judging whether the pressure maximum value and the average value of the hydraulic support column in the pressure change data of the hydraulic support column safety valve in the opening state meet second preset conditions.
And step 2052, if the second preset condition is met, determining that the final working state of the safety valve of the hydraulic support column on the coal mine working face is an opening state.
And step 2053, if the second preset condition is not met, determining that the final working state of the safety valve of the hydraulic support column on the coal mine working face is a closed state.
In the above embodiment, as an optional manner, the determining whether the maximum and average values of the pressure of the hydraulic support column in the pressure variation data of the hydraulic support column safety valve in the open state satisfy a second preset condition specifically includes:
judging whether the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is smaller than the maximum value difference value of preset pressure and whether the average value of the pressure of the hydraulic support upright column in the time period corresponding to the starting time length is larger than the average pressure threshold value;
if the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is smaller than the maximum value difference value of the preset pressure, and the average value of the pressure of the hydraulic support upright column in the time period corresponding to the starting time is larger than the average pressure threshold, determining that the maximum value and the average value of the pressure of the hydraulic support upright column meet a second preset condition;
and if the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is greater than or equal to the maximum value difference value of the preset pressure, and/or the average value of the pressure of the hydraulic support upright column in the time period corresponding to the opening time is less than or equal to the average pressure threshold, determining that the maximum value and the average value of the pressure of the hydraulic support upright column do not meet a second preset condition.
In specific implementation, after the working state of the hydraulic support column safety valve is determined through the step 201 and the step 203, the determined opening state of the hydraulic support column safety valve is further verified, so that the condition of misjudgment of the opening state is avoided in the whole judgment process. Specifically, after the hydraulic support column safety valve is determined to be in the opening state, the maximum value and the minimum value of the pressure of the hydraulic support column are obtained from the pressure change data of the hydraulic support column safety valve in the opening state, the pressure change data in the opening state are obtained according to the time node, and the pressure average value in the opening time period is calculated, so that whether a second preset condition is met or not is further judged.
For example, in the opening time period of the hydraulic support column safety valve, the maximum pressure P of the hydraulic support column is obtainedmaxAnd a minimum value of pressure PminCalculating the pressure difference between the two, if the pressure difference satisfies Pmax-Pmin<5MPa, and the pressure average value P in the opening time period of the safety valve of the upright post of the hydraulic support>If the pressure is 15MPa, determining that the pressure maximum value and the average value of the hydraulic support upright column meet a second preset condition, and indicating that the final working state of the hydraulic support upright column safety valve is an opening state; accordingly, if the pressure difference satisfies Pmax-PminAnd the pressure average value P in the opening time period of the hydraulic support column safety valve is not less than 5MPa, and/or the pressure average value P in the opening time period of the hydraulic support column safety valve is not more than 15MPa, determining that the pressure minimum value and the average value of the hydraulic support column do not meet a second preset condition, and indicating that the final working state of the hydraulic support column safety valve is a closed state.
Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus an essential general hardware platform, and can also be implemented by means of hardware. Through the technical scheme who uses this application, compare with current prior art, this embodiment obtains the pressure change data of hydraulic support stand through the pressure state of real-time supervision colliery working face hydraulic support stand to comprehensively obtain the hydraulic support working resistance variation situation, and according to the pressure change data of hydraulic support stand and the operating characteristic of hydraulic support stand relief valve, confirm the operating condition of colliery working face hydraulic support stand relief valve, thereby reach evaluation hydraulic support working property, roof pressure state, whether the relief valve damages the purpose. Therefore, the pressure change data of the hydraulic support stand column can be monitored in the underground coal mine, the working state of the hydraulic support stand column safety valve on the working face of the coal mine is determined by combining the working characteristics of the hydraulic support stand column safety valve, the actual opening pressure and the opening time of the safety valve in the working state are further determined, and the actual working condition of the safety valve in the underground coal mine working is accurately reflected.
Finally, it should be noted that, those skilled in the art should understand that the drawings are only schematic diagrams of a preferred implementation scenario, the flow in the drawings is not necessarily required for implementing the present application, the above detailed description is only used to illustrate the technical solution of the present invention and not to limit the present invention, and although the present invention is described in detail with reference to the examples, those skilled in the art should understand that, modifications or equivalent substitutions can be made on the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered in the scope of the claims of the present invention.
Claims (8)
1. A method for monitoring the working state of a safety valve of a hydraulic support is characterized by comprising the following steps:
the pressure state of the hydraulic support upright column of the coal mine working face is monitored in real time, so that pressure change data of the hydraulic support upright column are obtained;
determining the working state of the safety valve of the hydraulic support column on the coal mine working face according to the pressure change data of the hydraulic support column and the working characteristics of the safety valve of the hydraulic support column;
the working state of the hydraulic support column safety valve on the coal mine working face is determined according to the pressure change data of the hydraulic support column and the working characteristics of the hydraulic support column safety valve, and comprises the following steps:
according to the pressure change data of the hydraulic support upright column, calculating the pressure difference value between adjacent monitoring time points to be Bi＝Pi-Pi-1The pressure change data comprises pressure data P in sequence according to time sequencei，i＝1～n；
Judging whether the calculated pressure difference values are all within a preset pressure difference value range or not;
if the pressure difference values are within the preset pressure difference value range, acquiring the number of the pressure difference values larger than 0 and the number of the pressure difference values smaller than 0, and judging whether a first preset condition is met according to the acquired result;
and determining the working state of the hydraulic support column safety valve on the coal mine working face according to the judgment result and the working characteristics of the hydraulic support column safety valve.
2. The method of claim 1, wherein determining the operational status of the hydraulic support column safety valve at the coal mine face based on the pressure change data of the hydraulic support column and the operational characteristics of the hydraulic support column safety valve comprises:
according to the opening characteristic of the safety valve of the hydraulic support column, if the pressure change data of the hydraulic support column is within the pressure threshold range, determining that the working state of the safety valve of the hydraulic support column on the coal mine working face is an opening state;
and according to the closing characteristic of the hydraulic support column safety valve, if the pressure change data of the hydraulic support column is greater than or equal to or less than or equal to the pressure threshold value, determining that the working state of the hydraulic support column safety valve on the coal mine working face is a closing state.
3. The method according to claim 1, wherein the obtaining of the number of pressure difference values greater than 0 and the number of pressure difference values less than 0, and the determining whether the first preset condition is met according to the obtained result comprises:
when the pressure difference values comprise pressure difference values larger than 0 and pressure difference values smaller than 0, judging whether the difference value between the pressure difference value quantity larger than 0 and the pressure difference value quantity smaller than 0 is within a comparison threshold value range or not;
if the difference value is within the comparison threshold range, pressure data continuously greater than or equal to 0, pressure data continuously less than or equal to 0 and pressure data continuously equal to 0 are obtained, and whether a first preset condition is met or not is judged according to the obtained result.
4. The method according to claim 3, wherein the acquiring pressure data continuously greater than or equal to 0, pressure data continuously less than or equal to 0, and pressure data continuously equal to 0, and determining whether the first preset condition is met according to the acquiring result comprises:
if the obtained quantity of the pressure data which is continuously greater than or equal to 0, the quantity of the pressure data which is continuously less than or equal to 0 and the quantity of the pressure data which is continuously equal to 0 are respectively less than or equal to corresponding quantity thresholds, a first preset condition is met, otherwise, the first preset condition is not met; alternatively, the first and second electrodes may be,
if the obtained pressure data accumulated values which are continuously greater than or equal to 0 and the obtained pressure data accumulated values which are continuously less than or equal to 0 respectively meet the corresponding preset accumulated value range, and the quantity of the pressure data which are continuously equal to 0 is less than or equal to the corresponding quantity threshold value, a first preset condition is met, otherwise, the first preset condition is not met.
5. The method of claim 1, wherein determining the operational status of the hydraulic support column safety valve at the coal mine face based on the determination and the operational characteristics of the hydraulic support column safety valve comprises:
if the pressure difference value meets a first preset condition, determining that the working state of the hydraulic support column safety valve of the coal mine working face is an opening state according to the working characteristics of the hydraulic support column safety valve;
and if the pressure difference does not meet the first preset condition, determining the working state of the hydraulic support column safety valve of the coal mine working face to be a closed state according to the working characteristics of the hydraulic support column safety valve.
6. The method of claim 5, further comprising:
and determining the opening pressure and the opening duration of the hydraulic support column safety valve according to the opening state of the hydraulic support column safety valve.
7. The method of claim 6, further comprising: verifying the opening state of the safety valve of the vertical column of the hydraulic support on the coal mine working face, and determining the final working state of the safety valve of the vertical column of the hydraulic support on the coal mine working face, wherein the method specifically comprises the following steps:
judging whether the pressure maximum value and the average value of the hydraulic support upright post in the pressure change data of the hydraulic support upright post safety valve in the opening state meet a second preset condition or not;
if the second preset condition is met, determining that the final working state of the safety valve of the vertical column of the hydraulic support on the coal mine working face is an opening state;
and if the second preset condition is not met, determining that the final working state of the safety valve of the vertical column of the hydraulic support on the coal mine working face is a closed state.
8. The method according to claim 7, wherein the determining whether the pressure minimum value and the average value of the hydraulic support column in the pressure variation data of the hydraulic support column safety valve in the open state satisfy a second preset condition specifically comprises:
judging whether the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is smaller than the maximum value difference value of preset pressure and whether the average value of the pressure of the hydraulic support upright column in the time period corresponding to the starting time length is larger than the average pressure threshold value;
if the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is smaller than the maximum value difference value of the preset pressure, and the average value of the pressure of the hydraulic support upright column in the time period corresponding to the starting time is larger than the average pressure threshold, determining that the maximum value and the average value of the pressure of the hydraulic support upright column meet a second preset condition;
and if the difference value between the maximum value and the minimum value of the pressure of the hydraulic support upright column is greater than or equal to the maximum value difference value of the preset pressure, and/or the average value of the pressure of the hydraulic support upright column in the time period corresponding to the opening time is less than or equal to the average pressure threshold, determining that the maximum value and the average value of the pressure of the hydraulic support upright column do not meet a second preset condition.
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| CN112483141A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for predicting impact risk by support resistance |
| CN113900457B (en) * | 2021-09-29 | 2024-03-19 | 西安北方华创微电子装备有限公司 | Pressure zeroing method and semiconductor process equipment |
| CN114215564B (en) * | 2021-12-15 | 2023-11-28 | 北京康宁电通科技发展有限公司 | Intelligent early warning method for coal mine supporting equipment |
| CN115436051B (en) * | 2022-09-07 | 2023-10-17 | 国能榆林能源有限责任公司 | Hydraulic support pressure abnormality identification method |
| CN115235676B (en) * | 2022-09-26 | 2022-12-09 | 山东济矿鲁能煤电股份有限公司阳城煤矿 | Automatic alarm method for pressure abnormity of mine hydraulic support |
| CN117743988B (en) * | 2024-02-20 | 2024-04-19 | 太原理工大学 | Instant prediction method for pressure-bearing state of hydraulic support after initial support |
| CN117888938A (en) * | 2024-03-18 | 2024-04-16 | 宁波长壁流体动力科技有限公司 | Control method and control system for hydraulic support speed regulating valve |
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