CN112145231A - Early warning method for working condition of hydraulic support - Google Patents
Early warning method for working condition of hydraulic support Download PDFInfo
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Abstract
The application discloses an early warning method for working conditions of a hydraulic support, and relates to the technical field of coal mine safety mining, wherein the method comprises the following steps: monitoring the working resistance data of all hydraulic supports on the coal mine working face in real time; determining index values of a plurality of evaluation indexes for evaluating the working condition of the hydraulic support according to the working resistance change data in each coal mining cycle; and generating early warning information according to the index value of the evaluation index. Through the technical scheme of this application, carry out real-time supervision to all hydraulic support's of colliery working face working resistance data, can combine in the colliery and adopt the working face extraction in-process, through hydraulic support working resistance data analysis, confirm a plurality of evaluation indexes that are used for comprehensive evaluation hydraulic support operating mode to the realization is to the real-time supervision, analysis and the early warning of hydraulic support operating mode, in time the problem that exists in the middle of locating support struts and the roof management, have the important function to the guarantee is combined and is adopted working face roof safety.
Description
Technical Field
The application relates to the technical field of coal mine safety mining, in particular to a hydraulic support working condition early warning method.
Background
The hydraulic support is support equipment for supporting a top plate and a bottom plate of a coal face in coal mine production, the work face is isolated from a goaf, and the hydraulic support plays an important role in guaranteeing equipment and personnel safety in a stoping work face, and the performance level of the support performance is determined by the condition of the working condition of the hydraulic support, so that the hydraulic support has a great safety relation with the coal mine top plate. The roof accidents of the working face of the coal mine in China are analyzed, and besides natural factors such as complex geological conditions, strong mine pressure and the like, the factors that the working condition of the support is poor, and the support supporting capability of the support cannot be fully exerted are important disaster-causing factors generally existing in the roof accidents. In recent years, along with the increase of mining strength and mining depth year by year, in order to avoid roof accidents, many coal mines select hydraulic supports with high supporting strength and high working resistance as far as possible, but often neglect the management of mine pressure monitoring and supporting quality, the problems of poor working conditions such as low initial supporting force of the supports, uneven stress of front and rear columns, faulty operation of the supports and the like cannot be regarded for a long time, the supporting capability of the hydraulic supports with high supporting strength cannot be effectively exerted, and potential safety hazards are caused for a long time.
The defects of the prior art are as follows: the evaluation of the working condition of the hydraulic support lacks a uniform standard, and is mostly single index evaluation or after-the-fact evaluation, and the evaluation result has certain one-sidedness or lacks timeliness, so that the function of accurate and timely early warning cannot be achieved.
Disclosure of Invention
In view of the above, the application provides a hydraulic support working condition early warning method, and mainly aims to solve the technical problems that the existing hydraulic support working condition evaluation lacks a unified standard, and mostly is single index evaluation or after-the-fact evaluation, and the evaluation result has a certain one-sidedness or lacks timeliness, and cannot accurately and timely early warn.
According to the application, the early warning method for the working condition of the hydraulic support comprises the following steps:
monitoring the working resistance data of all hydraulic supports on the coal mine working face in real time;
determining index values of a plurality of evaluation indexes for evaluating the working condition of the hydraulic support according to the working resistance change data in each coal mining cycle;
and generating early warning information according to the index value of the evaluation index.
By means of the technical scheme, compared with the scheme that the existing hydraulic support working condition evaluation lacks a unified standard and is mostly single index evaluation or post evaluation, the method for early warning the working condition of the hydraulic support determines the evaluation index for evaluating the working condition of the hydraulic support by monitoring the working resistance change data of all hydraulic supports on the coal mine working face in each coal mining cycle in real time, so that corresponding early warning information is generated according to the determined index type and index value of the evaluation index. This application can combine in the colliery and adopt working face extraction in-process, through hydraulic support working resistance data analysis, confirms a plurality of evaluation indexes that are used for the comprehensive evaluation hydraulic support operating mode to the realization is to real-time supervision, analysis and the early warning of hydraulic support operating mode, and the problem that exists in the middle of in time locating support struts and the roof management has important effect to the guarantee is combined and is adopted working face roof safety.
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 shows a schematic flowchart of an early warning method for a working condition of a hydraulic bracket according to an embodiment of the present application;
FIG. 2 is a schematic flow chart illustrating another early warning method for the working condition of a hydraulic support according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a working resistance curve of a support in a coal mining cycle provided by an embodiment of the application;
fig. 4 shows a radar chart for comprehensive evaluation of the working condition grade of the bracket 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 method aims at the technical problems that the existing hydraulic support working condition evaluation result has certain one-sidedness or lacks of timeliness and cannot accurately and timely give an early warning. The embodiment provides an early warning method for the working condition of a hydraulic support, which can determine a plurality of evaluation indexes for comprehensively evaluating the working condition of the hydraulic support through the analysis of the working resistance data of the hydraulic support in the stoping process of a fully mechanized mining face of a coal mine, thereby realizing the real-time monitoring, analysis and early warning of the working condition of the hydraulic support, timely positioning the problems existing in support supporting and roof management, and having an important role in ensuring the safety of the roof of the fully mechanized mining face. As shown in fig. 1, the method includes:
and S101, monitoring the working resistance data of all the hydraulic supports on the coal mine working face in real time.
In the embodiment, the working resistance data of all hydraulic supports on the coal mine working face is monitored in real time by using the mine pressure on-line monitoring system, the monitoring of the working resistance of the hydraulic supports is the most main content of mine pressure monitoring on the coal mine fully mechanized working face, the resistance change characteristic in the working process of the supports is the most visual reflection of the good and bad working conditions of the supports, reliable index parameters reflecting the working conditions of the supports can be obtained through the analysis of the real-time monitoring data of the working resistance of the supports, and then a comprehensive evaluation and early warning model of the working conditions of the supports is established.
And S102, determining index values of a plurality of evaluation indexes for evaluating the working condition of the hydraulic support according to the working resistance change data in each coal mining cycle.
In this embodiment, the main factors influencing the working condition of the support of the fully mechanized mining face of the coal mine include the support initial supporting force condition, the safety valve opening condition, the support working resistance reporting condition, the working resistance distribution condition, the pressure maintaining condition of the hydraulic support system and the support upright stress balance condition. Therefore, the index values of 6 evaluation indexes influencing the working condition of the support of the fully mechanized coal mining face of the coal mine are obtained by monitoring the working resistance data of all hydraulic supports of the coal mine working face in real time, and the index values comprise the unqualified support initial supporting force proportion, the opening proportion of a support safety valve, the high reporting proportion of the support working resistance, the unqualified support working resistance distribution proportion, the support non-pressure-maintaining proportion and the support unbalance proportion.
In this embodiment, a plurality of evaluation indexes for evaluating the working condition of the hydraulic support include: the support pressure-maintaining device comprises a support initial supporting force unqualified proportion, a support safety valve opening proportion, a support working resistance high reporting proportion, a support working resistance distribution unqualified proportion, a support pressure-maintaining proportion and a support unbalance proportion.
In order to objectively and comprehensively evaluate the working condition of the hydraulic support of the whole coal mine fully-mechanized mining face, when an evaluation and early warning model (corresponding to the early warning method of the working condition of the hydraulic support) of the fully-mechanized mining face is established, the 6 evaluation indexes are used as main indexes for evaluating the working condition of the support and used for obtaining an evaluation result whether the support is selected or the working state of the support is reasonable or not.
And step S103, generating early warning information according to the index value of the evaluation index.
In this embodiment, according to the degree of influence of 6 evaluation indexes on the support operating mode, the weighted values of 6 evaluation indexes are determined in a pairwise comparison mode, the membership degree corresponding to the actual index value of the 6 evaluation indexes is determined, the overall membership degree of the hydraulic support operating mode is determined, therefore, according to the early warning grade division of the working face support operating mode, the early warning grade corresponding to the overall membership degree is determined, each index value and the corresponding support operating mode early warning grade are displayed in the early warning interface of the mine pressure on-line monitoring system in a radar map mode, when the early warning grade corresponding to the overall membership degree is poor or poor in the set support operating mode early warning grade, the early warning interface sends out early warning information, and the early warning information is early warning prompt tones and character information.
By applying the technical scheme of the embodiment, compared with the scheme that the existing hydraulic support working condition evaluation lacks a unified standard and is mostly single index evaluation or after-the-fact evaluation, the embodiment determines the evaluation index for evaluating the working condition of the hydraulic support by monitoring the working resistance data of all hydraulic supports on the coal mine working face in real time so as to generate corresponding early warning information according to the index type and the index value of the determined evaluation index. This application can combine in the colliery and adopt working face extraction in-process, through hydraulic support working resistance data analysis, based on a plurality of evaluation indexes that are used for the comprehensive evaluation hydraulic support operating mode, carry out real-time supervision, analysis and early warning to the hydraulic support operating mode, in time the problem that exists in the middle of the locating support struts and the roof management, has important effect to the guarantee to combine to adopt working face roof safety.
Further, as a refinement and an extension of the specific implementation of the above embodiment, in order to fully describe the specific implementation process of the embodiment, a method for warning the working condition of the hydraulic bracket is provided, as shown in fig. 2 and fig. 3, the method includes:
step S201, monitoring working resistance data of all hydraulic supports on a coal mine working face in real time.
And S202, determining the unqualified proportion of the initial support force of the support according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S202, as an optional manner, the method specifically includes:
determining the initial supporting force of each hydraulic support according to the working resistance change data;
and determining the unqualified proportion of the initial support force which is smaller than the standard value of the initial support force by judging whether the initial support force of each hydraulic support is smaller than the standard value of the initial support force.
In the implementation, whether the initial supporting force of each hydraulic support is smaller than the initial supporting force standard value or not is judged, and the unqualified proportion of the initial supporting force smaller than the initial supporting force standard value is determined, and the method specifically comprises the following steps:
and determining the proportion of the initial supporting force quantity in the total quantity of the initial supporting force of the hydraulic support on the coal mine working face according to the initial supporting force quantity smaller than the initial supporting force standard value, and taking the proportion as the unqualified proportion of the initial supporting force of the support.
In specific implementation, the actual initial supporting force of each hydraulic support in each coal mining cycle is determined by utilizing the automatic support initial supporting force identification function of the mine pressure on-line monitoring system; and when the actual initial support force of the support is smaller than the standard value (80% of the rated initial support force of the support), judging that the initial support force of the support is unqualified, and further determining the proportion of the initial support force of the support in the working surface, which is called the unqualified proportion of the initial support force of the support. The standard value of the initial supporting force of the hydraulic support is determined specifically by generally requiring that the actual initial supporting force of the support is not lower than 80% of the rated initial supporting force of the support according to the management requirement of a working face top plate.
As shown in fig. 3, after the initial supporting force of the hydraulic support is generated for a new frame moving operation, when the frame lifting action of the hydraulic support is finished, the emulsion pump station supplies emulsion to the lower cavity of the upright column to pressurize, so as to generate an active supporting force for the top plate. And monitoring the working resistance data of the bracket in real time by using an online monitoring system for mine pressure, and identifying the initial supporting force of the bracket according to the monitored working resistance data of the bracket. Specifically, the difference value of the working resistance data of two adjacent supports is compared in real time, when the difference value is larger than a threshold value (such as 5MPa), a key point is determined, and a turning point, namely an initial supporting force point, is searched backwards from the key point, wherein the turning point is formed by changing the speed of the working resistance data of the supports from high to low.
And S203, determining the opening ratio of the safety valve of the support according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S203, as an optional manner, the method specifically includes:
determining the number of stand columns of the bracket opened by the safety valve according to the working resistance change data;
and determining the proportion of the number of the stand columns of the support opened by the safety valve in the total number of the stand columns of the hydraulic support on the coal mine working face, and taking the proportion as the opening proportion of the safety valve of the support.
In implementation, the number of the stand columns of the bracket for opening the safety valve is determined according to the working resistance change data, and the method specifically comprises the following steps:
determining the working state of the hydraulic support upright post safety valve according to the working resistance change data;
and determining the number of the stand columns of the support opened by the safety valve according to the working state of the safety valve of the stand columns of the hydraulic support.
In specific implementation, the ratio of the number of the support stand columns with the opened safety valves to the total number of all hydraulic support stand columns on the working face in one coal mining cycle is counted, and the ratio is called the opening ratio of the support safety valves of the cycle.
And S204, determining the high reporting ratio of the working resistance of the support according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S204, as an optional manner, the method specifically includes:
and determining the reported proportion of the monitored working resistance of the bracket exceeding the early warning value of the bracket height, wherein the early warning value of the bracket height is a preset percentage of the rated working resistance of the bracket.
In specific implementation, the proportion of the number of the working resistance data to the total number of the working resistance data of the hydraulic support on the coal mine working face is determined according to the monitored number of the working resistance data exceeding the support height report early warning value and is used as the support working resistance height report proportion, specifically, the mine pressure online monitoring system monitors the support working resistance data in real time, and when the support working resistance data is increased to be close to the support rated working resistance data, namely 90% -95% of the support rated working resistance is reached, the support working resistance height report early warning is generated and displayed (the height report early warning value is set to be 90% -95% of the support rated working resistance). In one coal mining cycle, the working resistance of the stand column of the working face support reaches the proportion of the high-report early warning value, which is called the high-report proportion of the working resistance of the support.
And S205, determining the unqualified distribution proportion of the working resistance of the support according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S205, as an optional manner, the method specifically includes:
determining average working resistance data according to the working resistance change data;
and determining the proportion of the average working resistance data exceeding the preset reasonable value range of the average working resistance, and taking the proportion as the unqualified proportion of the distribution of the working resistance of the bracket.
In the specific implementation, the average working resistance data of the support in the coal mining circulation is counted and recorded as P, and the reasonable value requirement of the average working resistance of the support meets the following requirements: 80%. times.P0≤P≤90％×PForehead (forehead)In which P is0For pump station pressure or support rated setting force, PForehead (forehead)When the average working resistance of the bracket is too high (higher than the initial supporting force standard value or 90 percent multiplied by P) for the rated working resistance of the bracketForehead (forehead)) Or too low (lower than the overhead warning value of the stent, or 80% multiplied by P)0) The working condition of the bracket is unreasonable. And in one coal mining cycle, calculating the proportion of the average working resistance of all the supports on the working surface exceeding a reasonable range, namely the proportion of unqualified support working resistance distribution.
And S206, determining the support pressure-maintaining proportion according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S206, as an optional manner, the method specifically includes:
determining the cycle end resistance of each hydraulic support according to the working resistance change data;
and determining the non-pressure-maintaining proportion of all hydraulic supports on the coal mine working face by judging the difference value between the cycle end resistance and the initial supporting force.
In the implementation, the pressure-maintaining proportion of all the hydraulic supports on the coal mine working face is determined by judging the difference value between the cycle end resistance and the initial supporting force, and the method specifically comprises the following steps:
when the cycle end resistance is smaller than the initial support force and the difference value between the cycle end resistance and the initial support force exceeds a preset percentage of the rated initial support force, determining the number of the support stand columns without pressure maintaining;
and determining the proportion of the number of the upright columns of the pressure-maintaining support to the total number of the upright columns of the hydraulic support on the coal mine working face, and taking the proportion as the pressure-maintaining proportion of the support.
In specific implementation, the support non-pressure maintaining refers to the condition that the damage of a sealing element of a support hydraulic system causes the automatic pressure relief of a support upright column, which is expressed as the resistance reduction of the support, the condition that the resistance of the support at the end of circulation is smaller than the initial supporting force occurs, the support upright column can cause the unbalance loading of the support, the support supporting capacity can not be effectively exerted, and particularly, when the support is subjected to non-pressure maintaining in a large range, the roof cutting or the frame pressing accident of a working face can be easily caused.
Specifically, the slope change of the curve of the working resistance of the support and the time is analyzed, when the continuous reduction of the working resistance of the support is monitored, the cycle end resistance of the support stand column is compared with the initial support force of the stand column in the coal mining cycle, and if the initial support force is larger than the end resistance force and the difference value exceeds 10% of the rated initial support force, the support stand column is judged not to maintain pressure. The proportion of the number of the support columns with non-pressure-maintaining state in the coal mining cycle to the total number of the support columns of the working face is counted, and the proportion is called the non-pressure-maintaining proportion of the support of the working face.
As shown in FIG. 3, the end-of-cycle resistance is the final working resistance at the end of each coal mining cycle before the hydraulic support moves. And monitoring the working resistance data of the support in real time by using an online mine pressure monitoring system, and identifying the resistance at the end of circulation according to the monitored working resistance data of the support. Specifically, the difference value of the working resistance data of two adjacent supports is compared in real time, when the difference value is larger than a threshold value (such as 5MPa), a key point is determined, and a maximum value point in a fixed time is searched forward from the key point, namely the resistance at the end of circulation.
And S207, determining the unbalance proportion of the support according to the working resistance change data in each coal mining cycle.
In the foregoing embodiment, to illustrate a specific implementation process of step S207, as an optional manner, the method specifically includes:
determining the pressure difference value between the upright columns of each hydraulic support according to the working resistance change data;
and determining the unbalance proportion of all the hydraulic supports on the coal mine working face by judging the pressure difference value between the upright columns of each hydraulic support.
In the implementation, through judging the pressure difference between the stand of every hydraulic support, confirm the unbalanced proportion of all hydraulic supports of colliery working face, specifically include:
respectively determining pressure thresholds for judging the stress imbalance of the upright columns of the support according to different support types of the hydraulic support;
and determining the proportion of the number of the hydraulic supports in the total number of the hydraulic supports on the coal mine working face according to the number of the hydraulic supports with the pressure difference value larger than the pressure threshold value, and taking the proportion as the unbalance proportion of the supports.
In specific implementation, the unbalanced support refers to the phenomenon that the left and right upright columns or the front and rear upright columns of the support are stressed unevenly. The pressure difference between the left and right upright columns of the two-column hydraulic support exceeds 10 percent (corresponding to a pressure threshold) of the rated working pressure, and the pressure difference between the front and rear upright columns of the four-column hydraulic support exceeds 15 percent (corresponding to a pressure threshold) of the rated working pressure, and the support is considered to be unbalanced. And counting the proportion of the number of the unbalanced supports of the left and right upright columns or the front and rear upright columns in the total number of the counted supports of the working face according to a judgment standard of the unbalance of the supports, wherein the proportion is called the unbalance proportion of the supports of the working face.
And S208, determining the integral membership degree of the working condition of the hydraulic support according to the weight value corresponding to each evaluation index and the membership degree corresponding to each index value.
In specific implementation, according to the unqualified proportion of the initial support force of the support, the opening proportion of a safety valve of the support, the high reporting proportion of the working resistance of the support, the unqualified proportion of the distribution of the working resistance of the support, the non-pressure maintaining proportion of the support and the unbalanced proportion of the support, the early warning grade of the working condition of the support corresponding to 6 evaluation indexes is determined according to the influence degree of different threshold intervals of the evaluation indexes on the working condition of the support, and interval division is carried out according to the:
1) and (3) grading the working conditions of the support corresponding to the unqualified proportion of the initial support force of the support, as shown in table 1.
TABLE 1 classification of unqualified proportional support setting force
| Unqualified proportion u1 of support |
0～10％ | 10％～30％ | 30％～50％ | 50％～100％ |
| Degree of membership μ 1 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
2) And (3) grading the working conditions of the support corresponding to the opening ratio of the safety valve, as shown in table 2.
TABLE 2 bracket safety valve opening ratio grading
| Opening ratio u2 of |
0～10％ | 10％～30％ | 30％～50％ | 50％～100％ |
| Degree of membership μ 2 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
3) The working resistance of the support is reported in grades according to the working conditions of the support, and the grades are shown in table 3.
TABLE 3 high reporting ratio grading of stent working resistance
| High report ratio u3 of working resistance of |
0～20％ | 20％～40％ | 40％～60％ | 60％～100％ |
| Degree of membership μ 3 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
4) The working condition grades of the bracket corresponding to the unqualified distribution ratio of the working resistance of the bracket are shown in the table 4.
TABLE 4 Classification of unqualified proportion of distribution of working resistance of support
| Unqualified distribution proportion u4 of working resistance of |
0～20％ | 20％～40％ | 40％～60％ | 60％～100％ |
| Degree of membership μ 4 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
5) The classification of the working condition grades of the bracket corresponding to the pressure-maintaining proportion of the bracket is shown in table 5.
TABLE 5 proportional grading of scaffolds without pressure maintenance
| Scaffold pressure-maintaining |
0～5％ | 5％～10％ | 10％～20％ | 20％～100％ |
| Degree of membership μ 5 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
6) The classification of the bracket working condition grades corresponding to the bracket unbalance proportion is shown in table 6.
TABLE 6 Stent imbalance ratio grading
| Stent |
0～10％ | 10％～30％ | 30％～50％ | 50％～100％ |
| Degree of membership μ 6 | 1.0～0.8 | 0.8～0.6 | 0.6～0.4 | 0.4～0 |
| Bracket working condition grade | Good effect | Medium and high grade | Is poor | Is very poor |
Let the weight of 6 evaluation indexes be Ai(i ═ 1, 2, 3, 4, 5, 6), the overall membership value μ for the rack operating condition classes was calculated as follows:
μ＝ΣAiμi＝A1μ1+A2μ2+A3μ3+A4μ4+A5μ5+A6μ6
according to the influence degree of the 6 evaluation indexes on the working condition of the support, the weight distribution of the 6 evaluation indexes is determined in a pairwise comparison mode, and the weight distribution is shown in the following table 7.
TABLE 7 support Condition evaluation index weight partitioning
And S209, generating early warning information containing early warning grades according to the membership degree and/or the overall membership degree corresponding to each index value.
In specific implementation, the membership value mu corresponding to 6 evaluation indexes is usediAnd calculating the comprehensive membership value of the support working condition according to the preset weight, judging the early warning level of the working surface support working condition according to the calculation result, and displaying each index value and the corresponding support working condition early warning level in a radar map form on a system early warning interface, as shown in fig. 4. When any index value in the 6 evaluation indexes reaches a set early warning threshold value with poor or poor bracket working condition grade, a system interface sends out early warning information.
The working conditions of the support are divided into 4 grades, namely good, medium, poor and poor. And classifying the early warning grades of the working conditions of the support according to a membership degree evaluation method, as shown in a table 8.
TABLE 8 early warning classification of bracket working condition
| Degree of membership mu | <0.4 | 0.4～0.6 | 0.6～0.8 | ≥0.8 |
| Bracket working condition grade | Is very poor | Is poor | Medium and high grade | Good effect |
In specific implementation, the hydraulic support and/or the roof hidden danger can be positioned according to the evaluation index corresponding to the early warning level in the early warning information and/or the overall working condition of the hydraulic support. When the evaluation index corresponding to the early warning level is the unqualified support initial supporting force proportion, prompting that the roof management requirement is not met; when the evaluation index corresponding to the early warning level is the ratio of the reported working resistance of the support, prompting the site to pay attention to prevent the situations that the roof rapidly sinks and the like are used for representing the strong mine pressure of the working face, and the situations that the safety valve of the support is opened and the like; and when the evaluation index corresponding to the early warning level is the pressure-maintaining proportion of the support, prompting that the roof cutting or support pressing accident of the working surface is easy to cause.
For the convenience of implementation of the application, the following early warning of the working condition of the hydraulic support based on the working resistance of the support is described by a specific example.
The statistical evaluation index parameters of the working conditions of 4 coal mine supports in China are shown in a table 9, the membership degree of the working condition evaluation index of each coal mine support and the grade of the working condition of the support are obtained by the early warning method, and the grades of the working conditions of the supports corresponding to 4 coal mines are good, medium and poor respectively.
TABLE 9 statistics of coal mine support working condition evaluation index parameters
TABLE 10 statistics of membership of evaluation indexes of working conditions of coal mine supports and grading of working conditions of supports
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus a necessary general hardware platform, and can also be implemented by hardware. By applying the technical scheme of the application, compared with the prior art, the evaluation index for evaluating the working condition of the hydraulic support is determined by monitoring the working resistance change data of all the hydraulic supports on the coal mine working face in real time in each coal mining cycle, so that corresponding early warning information is generated according to the index type and the index value of the determined evaluation index. This application can combine in the colliery and adopt working face extraction in-process, through hydraulic support working resistance data analysis, confirms a plurality of evaluation indexes that are used for the comprehensive evaluation hydraulic support operating mode to the realization is to real-time supervision, analysis and the early warning of hydraulic support operating mode, and the problem that exists in the middle of in time locating support struts and the roof management has important effect to the guarantee is combined and is adopted working face roof safety.
Finally, it should be noted that those skilled in the art can 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 for illustrating the technical solution of the present invention and is not limited, 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, and all that should be covered in the claims of the present invention.
Claims (10)
1. The early warning method for the working condition of the hydraulic support is characterized by comprising the following steps of:
monitoring the working resistance data of all hydraulic supports on the coal mine working face in real time;
determining index values of a plurality of evaluation indexes for evaluating the working condition of the hydraulic support according to the working resistance change data in each coal mining cycle;
and generating early warning information according to the index value of the evaluation index.
2. The method of claim 1, wherein the plurality of evaluation indicators for evaluating the operating condition of the hydraulic mount comprise: the support pressure-maintaining device comprises a support initial supporting force unqualified proportion, a support safety valve opening proportion, a support working resistance high reporting proportion, a support working resistance distribution unqualified proportion, a support pressure-maintaining proportion and a support unbalance proportion.
3. The method according to claim 2, wherein the step of determining the unqualified support initial support force ratio according to the working resistance variation data in each coal mining cycle specifically comprises the following steps:
determining the initial supporting force of each hydraulic support according to the working resistance change data;
and determining the unqualified proportion of the initial support force which is smaller than the standard value of the initial support force by judging whether the initial support force of each hydraulic support is smaller than the standard value of the initial support force.
4. The method according to claim 2, wherein determining the opening proportion of the support safety valve according to the working resistance change data in each coal mining cycle specifically comprises:
determining the number of stand columns of the bracket opened by the safety valve according to the working resistance change data;
and determining the proportion of the number of the stand columns of the support opened by the safety valve in the total number of the stand columns of the hydraulic support on the coal mine working face, and taking the proportion as the opening proportion of the safety valve of the support.
5. The method according to claim 2, wherein determining a bracket working resistance reporting ratio according to the working resistance change data in each coal mining cycle specifically comprises:
and determining the reported proportion of the monitored working resistance of the bracket exceeding the early warning value of the bracket height, wherein the early warning value of the bracket height is a preset percentage of the rated working resistance of the bracket.
6. The method according to claim 2, wherein the step of determining the unqualified support working resistance distribution ratio according to the working resistance variation data in each coal mining cycle specifically comprises the following steps:
determining average working resistance data according to the working resistance change data;
and determining the proportion of the average working resistance data exceeding the preset reasonable value range of the average working resistance, and taking the proportion as the unqualified proportion of the distribution of the working resistance of the bracket.
7. The method according to claim 2, wherein the determining of the scaffold no-pressure proportion according to the working resistance change data in each coal mining cycle comprises:
determining the cycle end resistance of each hydraulic support according to the working resistance change data;
determining the non-pressure-maintaining proportion of all hydraulic supports on the coal mine working face by judging the difference value between the cycle end resistance and the initial supporting force;
the method comprises the following steps of determining the non-pressure-maintaining proportion of all hydraulic supports on the coal mine working face by judging the difference value between the cycle end resistance and the initial supporting force, and specifically comprises the following steps:
when the cycle end resistance is smaller than the initial support force and the difference value between the cycle end resistance and the initial support force exceeds a preset percentage of the rated initial support force, determining the number of the support stand columns without pressure maintaining;
and determining the proportion of the number of the upright columns of the pressure-maintaining support to the total number of the upright columns of the hydraulic support on the coal mine working face, and taking the proportion as the pressure-maintaining proportion of the support.
8. The method according to claim 2, wherein determining a bracket imbalance ratio based on the operational resistance change data in each coal mining cycle comprises:
determining the pressure difference value between the upright columns of each hydraulic support according to the working resistance change data;
and determining the unbalance proportion of all the hydraulic supports on the coal mine working face by judging the pressure difference value between the upright columns of each hydraulic support.
9. The method of claim 8, wherein determining the imbalance ratio of all hydraulic supports on the coal mine working face by determining the pressure difference between the columns of each hydraulic support comprises:
respectively determining pressure thresholds for judging the stress imbalance of the upright columns of the support according to different support types of the hydraulic support;
and determining the proportion of the number of the hydraulic supports in the total number of the hydraulic supports on the coal mine working face according to the number of the hydraulic supports with the pressure difference value larger than the pressure threshold value, and taking the proportion as the unbalance proportion of the supports.
10. The method according to claim 1, wherein generating early warning information according to the index value of the evaluation index specifically includes:
determining the integral membership degree of the working condition of the hydraulic support according to the weight value corresponding to each evaluation index and the membership degree corresponding to each index value;
and generating early warning information containing early warning grades according to the membership degree and/or the integral membership degree corresponding to each index value.
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Application publication date: 20201229 |