CN111681125A - Top plate pressure calculation method, storage medium, and electronic apparatus - Google Patents
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Abstract
The application discloses a top plate pressure calculation method, a storage medium and an electronic device, which include: screening the maximum support load value of each hydraulic support and the corresponding key time point; determining a coal mining cycle process according to the maximum support load value and the key time point; and calculating the pressure of the top plate by utilizing the circulation end resistance of the hydraulic support in the coal mining circulation process. The mine pressure data that can not reflect roof motion law that utilizes this application can reduce because hydraulic support bad behavior, artifical maloperation produce makes the calculated result more accurate, is favorable to comprehensively, accurately summarizing roof mine pressure law, improves the automatic level of analysis of mine pressure data, reduces the human input, and then guarantees coal mining's security.
Description
Technical Field
The application relates to the technical field of coal mines, in particular to a top plate pressure calculation method, a storage medium and electronic equipment.
Background
The method is an effective means for effectively preventing and treating roof disasters by enhancing mine pressure monitoring and early warning, and the calculation of the step distance of roof pressure is a key link for analyzing the activity rule of the roof and developing the mine pressure early warning.
At present, the roof pressure step is mainly calculated by a single hydraulic support, and due to the fact that the geology and the mining conditions of the fully-mechanized mining working face are very complex, the phenomena of unevenness of the roof and the bottom plate, liquid leakage or liquid leakage of pipelines and the like happen occasionally, the working resistance of partial hydraulic supports cannot completely reflect the sinking movement characteristics of the roof, the roof pressure obtained through calculation is not accurate enough, and the danger coefficient of coal mining is increased.
Disclosure of Invention
In view of the above, the present application provides a top plate pressure calculation method, a storage medium and an electronic device to solve the above technical problems.
The application provides a top plate pressure calculation method, which comprises the following steps: screening the maximum support load value of each hydraulic support and the corresponding key time point; determining a coal mining cycle process according to the maximum support load value and the key time point; and calculating the pressure of the top plate by utilizing the circulation end resistance of the hydraulic support in the coal mining circulation process.
Optionally, screening out the maximum bracket load value and the corresponding key time point of each hydraulic bracket comprises: collecting the working resistance of the hydraulic support on the whole working face in real time, and drawing a hydraulic support time sequence curve by taking time as an abscissa and the working resistance of the hydraulic support as an ordinate; calculating the difference value of the working resistance of each adjacent hydraulic support according to the hydraulic support time sequence curve; and comparing the difference value with a first preset threshold value, determining the maximum value of the support load according to the comparison result, and determining the time point corresponding to the maximum value of the support load as the corresponding key time point.
Optionally, comparing the difference with a first preset threshold, determining a maximum value of the rack load according to a comparison result, and determining a time point corresponding to the maximum value of the rack load as a corresponding key time point includes: if the difference value of the working resistance of the hydraulic support at the current time point and the working resistance of the hydraulic support at the next time point is smaller than a first preset threshold value, filtering the working resistance of the hydraulic support at the current time point; and if the difference value of the working resistance of the hydraulic support is judged to be larger than or equal to a first preset threshold value, screening out the maximum value of the working resistance of the hydraulic support in a preset historical time period according to the timing curve of the hydraulic support, determining the maximum value of the working resistance of the hydraulic support as the maximum value of the load of the support, and determining the corresponding time point as the corresponding key time point.
Optionally, determining the coal mining cycle process according to the maximum value of the support load and the key time point comprises: calculating a judgment interval of each coal mining cycle process according to the key time point set of each hydraulic support; and if the proportion of the number of the key time points in the judgment interval to the total number in the key time point set is larger than a second preset threshold value, judging the judgment interval as a coal mining circulation process.
Optionally, calculating a determination interval of each coal mining cycle process according to the set of key time points of each hydraulic support includes: determining key time points of each hydraulic support in each resistance reducing action, and constructing a key time point set; calculating the average value of the key time points in the key time point set, and determining the average value as an average time point; and calculating the interval endpoint of the judgment interval according to the key time point and the average time point.
Optionally, calculating the section endpoint of the determination section according to the key time point and the average time point includes: determining the key time points which are greater than or equal to the average time point as first key time points, and determining the key time points which are less than the average time point as second key time points; calculating a left interval endpoint of the judgment interval by using the first key time point and a first calculation formula; and calculating the right interval endpoint of the judgment interval by using the second key time point and a second calculation formula.
Optionally, a first calculation formula and a second calculation formulaThe calculation formulas are as follows:
wherein T1 is the left interval endpoint, T2 is the right interval endpoint, TijGenerating a key time point corresponding to the maximum value of the support load when the jth hydraulic support performs the jth resistance reducing action when
When t isijIs the first key time point when
When t isijIs a second key time point;
is the average time point;
the average value of the difference value between the first key time point or the second key time point and the average time point is obtained.
Optionally, calculating the roof pressure using the hydraulic support end-of-cycle resistance during the coal mining cycle comprises: determining the key time point in the judgment interval as a target key time point, and determining the working resistance of the hydraulic support corresponding to the target key time point as the resistance at the end of circulation; the average of the end-of-cycle resistances is calculated and determined as the roof pressure during the coal mining cycle.
The present application also provides a non-transitory computer storage medium storing computer-executable instructions configured as the top plate pressure calculation method as described above.
The present application further provides an electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the ceiling pressure calculation method as described above.
The top plate pressure calculation method screens the maximum support load value of each hydraulic support and the corresponding key time point; then determining a coal mining cycle process according to the screened maximum support load value and the key time point; and the hydraulic support circulation end resistance in the coal mining circulation process is reused for calculating the roof pressure, and the maximum support load value and the key time point are subjected to screening treatment, so that mine pressure data which cannot reflect roof movement rules and are generated due to poor working conditions and manual misoperation of the hydraulic support can be reduced, the calculation result is more accurate, the comprehensive and accurate summary of the roof mine pressure rules is facilitated, the analysis automation level of the mine pressure data is improved, the labor input is reduced, and the safety of coal mining is further ensured.
Drawings
Fig. 1 is a schematic flow chart of a top plate pressure calculation method according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of a top plate pressure calculation method according to another embodiment of the present application.
FIG. 3 is a timing diagram of the hydraulic mount of the present application.
Fig. 4 is a schematic structural diagram of a top plate pressure calculation device according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a top plate pressure calculation device according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Fig. 1 is a flowchart illustrating a roof pressure calculation method according to the present application, and as shown in fig. 1, the roof pressure calculation method provided by the present application is applicable to calculation of roof pressure of a fully mechanized mining face, and the method includes:
s101, screening the maximum support load value of each hydraulic support and the corresponding key time point.
The execution main body in the embodiment can be a device and equipment for judging and identifying the coal mining circulation process and calculating the top plate pressure of the fully-mechanized coal face in the coal mining circulation process.
And S102, determining a coal mining cycle process according to the maximum support load value and the key time point.
For the embodiment, which resistance reduction belongs to the frame moving action and the coal mining cycle can be judged according to the maximum support load value and the key time point, and the purpose is to filter out the resistance reduction process generated by non-frame moving, so that the correct cycle end resistance and the corresponding time in the coal mining cycle process are identified, and the roof pressure is accurately calculated.
S103, calculating the pressure of the top plate by utilizing the circulation end resistance of the hydraulic support in the coal mining circulation process.
For this embodiment, the average of the identified hydraulic mount end-of-cycle resistances may be taken as the full face mine pressure, i.e., the roof pressure.
The top plate pressure calculation method screens the maximum support load value of each hydraulic support and the corresponding key time point; then determining a coal mining cycle process according to the screened maximum support load value and the key time point; and the hydraulic support circulation end resistance in the coal mining circulation process is reused for calculating the roof pressure, and the maximum support load value and the key time point are subjected to screening treatment, so that mine pressure data which cannot reflect roof movement rules and are generated due to poor working conditions and manual misoperation of the hydraulic support can be reduced, the calculation result is more accurate, the comprehensive and accurate summary of the roof mine pressure rules is facilitated, the analysis automation level of the mine pressure data is improved, the labor input is reduced, and the safety of coal mining is further ensured.
Further, as a refinement and an extension of the embodiment of the above embodiment, in order to fully explain the implementation process in this embodiment, another method for calculating the roof pressure of a fully mechanized mining face is provided, as shown in fig. 2, the method includes:
s201, collecting the working resistance of the hydraulic support on the full working face in real time, and drawing a hydraulic support time sequence curve by taking time as an abscissa and the working resistance of the hydraulic support as an ordinate.
In a specific application scenario of the application, a mine pressure real-time monitoring system with a data acquisition period of less than 30s can be adopted to acquire all the working resistances of the hydraulic supports on the whole working face in real time. The hydraulic support of the whole working face is the whole hydraulic support on the whole working face.
In order to more intuitively display the change trend of the working resistance of the hydraulic support along with the time, the time can be an abscissa, the working resistance of the hydraulic support can be an ordinate, a hydraulic support time sequence curve is drawn, and the hydraulic working resistance data is arranged according to time sequence.
S202, calculating the difference value of the working resistance of each adjacent hydraulic support according to the hydraulic support time sequence curve.
For the embodiment, in a specific application scenario, if a hydraulic support time sequence curve in a time period from 18:14 days 07/07 to 03:50 days 07/08 is taken as an analysis curve of a certain hydraulic support, as shown in fig. 3, a difference between working resistances of adjacent hydraulic supports, that is, P, can be calculated in the analysis curven+1-Pn。
S203, comparing the difference value with a first preset threshold value, determining the maximum value of the support load according to the comparison result, and determining the time point corresponding to the maximum value of the support load as the corresponding key time point.
For this embodiment, in a specific application scenario, in order to determine the maximum stent load and the corresponding key time point, step S203 may specifically include:
if the difference value of the working resistance of the hydraulic support at the current time point and the working resistance of the hydraulic support at the next time point is smaller than a first preset threshold value, filtering the working resistance of the hydraulic support at the current time point;
and if the working resistance difference value of the hydraulic support is judged to be larger than or equal to a first preset threshold value, screening out the maximum value of the working resistance of the hydraulic support in a preset historical time period according to the timing curve of the hydraulic support, determining the maximum value of the working resistance of the hydraulic support as the maximum value of the load of the support, and determining the corresponding time point as the corresponding key time point.
The first preset threshold is a minimum determination value used for determining whether a maximum value of the stent load exists before the current time point, and the specific numerical value may be set according to an actual application scenario, for example, may be set to 5 KN. The preset historical time period is a minimum range interval for screening out the maximum working resistance of the hydraulic support, and can be set to 5 minutes for example. In a specific application scenario, based on the example of embodiment step 202, if P is determinedn+1-PnWhen the pressure is less than 5KN, the resistance reducing process generated by non-moving of the frame can be determined, and in order to not influence the calculation result of the fully-mechanized mining face roof pressure, the working resistance of the hydraulic support needs to be filtered out, so that the effective circulation end resistance can be screened out from the massive ore pressure data. When judging Pn+1-PnWhen greater than or equal to 5kN, can be PnAnd searching the maximum working resistance value of the hydraulic support within 5 minutes forwards as a time starting point, and determining a time point corresponding to the value as a key time point of the resistance reducing process of the hydraulic support.
And S204, calculating a judgment interval of each coal mining cycle process according to the key time point set of each hydraulic support.
For this embodiment, in a specific application scenario, in order to determine the determination section of each hydraulic bracket, step S204 may specifically include:
determining key time points of each hydraulic support in each resistance reducing action, and constructing a key time point set;
calculating the average value of the key time points in the key time point set, and determining the average value as an average time point;
and calculating the interval end point of the judgment interval according to the key time point and the average time point.
For this embodiment, based on the embodiment of the embodiment S203, the key time points of the resistance reducing process of each hydraulic support on the whole working surface are analyzed one by one, and the maximum value p of the support load when the ith hydraulic support generates the jth resistance reducing action is sequentially obtainedijAnd its critical time point tijAnd with pijElements form a bracket load maximum value set P of the full working surface hydraulic bracket in the resistance reducing process, and t is usedijAnd forming a key point set T for the elements, and calculating the average value of key time points in the key time point set.
In a specific application scenario, in order to calculate the average value and the range conveniently, the key time point t may be setijConverting into time stamp, processing, such as 2019-12-2016: 21:47 converting into time stamp 1576830107, calculating average value and range, and converting into specific time point. The key time point corresponding to the time from stent # 1 to stent # i is t11-ti1. Wherein t is11Is the critical moment of resistance reduction of the first bracket of the working face machine head, ti1Is the key moment of resistance reduction of the last bracket at the tail of the working face machine. Then the average time point of the first cycle is t11-ti1The j th coal mining cycle t is obtained by the same method1j-tijAverage time point of (a).
Correspondingly, in order to calculate the section end point of the determination section according to the key time point and the average time point, the method may further include: determining the key time points which are greater than or equal to the average time point as first key time points, and determining the key time points which are less than the average time point as second key time points; calculating a left interval endpoint of the judgment interval by using the first key time point and a first calculation formula; and calculating the right interval endpoint of the judgment interval by using the second key time point and a second calculation formula.
Correspondingly, a full working face hydraulic support cycle end resistance analysis model can be established according to the obtained maximum value set T, and resistance reduction processes generated by non-frame moving are screened out from a plurality of calculated significant resistance reduction processes, so that the correct time corresponding to the cycle end resistance is identified. Wherein, the key time point t of each bracket can be determined according to i jAnd average time point
Size of (2), divide the set element intoIs divided into two parts, wherein one part is when tij≥tijWhen, will tijThe first key time point is determined, and the corresponding first calculation formula is as follows:
the other part is when tij<tijWhen, will tijDetermining a second key time point, wherein a corresponding second calculation formula is as follows:
wherein,
the average value of the difference value between the first key time point or the second key time point and the average time point is obtained.
And S205, if the proportion of the number of the key time points in the judgment interval to the total number in the key time point set is larger than a second preset threshold value, judging the judgment interval as the coal mining circulation process.
The second preset threshold is a minimum threshold used for determining that the current determination interval is a coal mining cycle process, and specific numerical values can be set according to actual application scenarios, for example, the numerical values can be set to 80%.
With the present embodiment, after the section boundaries T1 and T2 of the respective coal mining cycles are determined based on step S204, it may be further determined whether the time of the first coal mining cycle of all the racks is at [ T1, T2 ]]Within this boundary, if element tijIn the set [ T1, T2]The number of inner accounts for tijWhen the ratio of the total amounts exceeds 80%, the results are considered to be [ T1, T2 ]]This time period is a coal mining cycle, otherwise not a coal mining cycle.
And S206, determining the key time point in the judgment interval as a target key time point, and determining the working resistance of the hydraulic support corresponding to the target key time point as the end-of-cycle resistance.
For the embodiment, the purpose of determining the target key time point is to screen out the resistance reduction process generated by non-moving frames in order to identify the correct cycle end resistance and the corresponding time, so that the calculated fully-mechanized mining face roof pressure is more accurate.
And S207, calculating an average value of resistance at the end of the cycle, and determining the average value as the roof pressure in the coal mining cycle process.
For the present embodiment, the set [ T1, T2 ] may be calculated]Internal element tijAnd taking the average value of the corresponding hydraulic cycle end resistance as the full working face top plate pressure.
In this embodiment, when t isijIn the interval [ T1, T2]When the coal mining is performed in the beginning, the coal mining circulation analysis of the (j + 1) th time is not involved; when t isijIn the interval [ T1, T2]Otherwise, the time point lags the jth frame moving time, and the j +1 th coal mining cycle analysis process can still be participated; the time difference between two adjacent coal mining cycles is larger than the ratio of the length of the working face to the speed of the coal mining machine, and the length of the working face and the speed of the coal mining machine can be obtained according to actual field measurement.
The top plate pressure calculating method can adopt a high-precision high-sampling-frequency mine pressure monitoring system to acquire the working resistance of the hydraulic supports of a full-mechanized coal mining face in real time, draw a hydraulic support working resistance time sequence change curve, calculate the maximum support load value and the key time point of each hydraulic support of the full-mechanized coal mining face in the coal mining cycle process one by one, and screen the resistance reduction process generated by non-moving supports in the calculated numerous obvious resistance reduction processes according to the working resistance change characteristics of the hydraulic supports in the frame moving process, so that correct cycle end resistance and corresponding time are identified, and the top plate pressure is calculated by using the cycle end resistance of the hydraulic supports in the coal mining cycle process. Through the scheme, whole working face mine pressure can be identified in real time and automatically, roof pressure step pitch calculation is carried out to whole working face mine pressure, mine pressure data which cannot reflect roof motion rules and are generated due to poor working conditions of the hydraulic support and manual misoperation can be reduced, calculation results are more accurate, comprehensive and accurate roof mine pressure rules can be summarized, the analysis automation level of the mine pressure data is improved, the labor input is reduced, and the safety of coal mining is guaranteed.
Further, as a concrete embodiment of the method shown in fig. 1 and fig. 2, the present application provides a device for calculating the pressure of the top plate, as shown in fig. 4, the device includes: a screening module 31, a determination module 32 and a calculation module 33;
the screening module 31 can be used for screening the maximum support load value of each hydraulic support and the corresponding key time point;
the determining module 32 is used for determining a coal mining cycle process according to the maximum bracket load value of the judging interval and the key time point of the judging interval;
and the calculation module 33 can be used for calculating the roof pressure by using the hydraulic support circulation end resistance in the judgment interval coal mining circulation process.
In a specific application scenario, in order to screen out the maximum bracket load value of each hydraulic bracket and the corresponding key time point, as shown in fig. 5, the screening module 31 may specifically include: a drawing unit 311, a calculation unit 312, a determination unit 313;
the drawing unit 311 is used for collecting the working resistance of the hydraulic support on the full working face in real time, judging the working resistance of the hydraulic support in an interval as a vertical coordinate by taking time as a horizontal coordinate, and drawing a hydraulic support time sequence curve;
the calculating unit 312 is configured to calculate a difference between the working resistances of the adjacent hydraulic supports according to the timing curve of the hydraulic support in the determination interval;
the determining unit 313 may be configured to compare the determination section difference with a first preset threshold, determine a maximum value of the rack load according to a comparison result, and determine a time point corresponding to the maximum value of the rack load in the determination section as a corresponding key time point.
Correspondingly, the determining unit 313 is specifically configured to filter the working resistance of the hydraulic support at the current time point of the determination interval if it is determined that the difference between the working resistance of the hydraulic support at the current time point and the working resistance of the hydraulic support at the next time point is smaller than the first preset threshold value of the determination interval; and if the difference value of the working resistance of the hydraulic support in the judgment interval is greater than or equal to a first preset threshold value in the judgment interval, screening the maximum value of the working resistance of the hydraulic support in a preset historical time period according to a time sequence curve of the hydraulic support in the judgment interval, determining the maximum value of the working resistance of the hydraulic support in the judgment interval as the maximum value of the load of the support in the judgment interval, and determining the corresponding time point as the key time point of the corresponding judgment interval.
In a specific application scenario, in order to determine a coal mining cycle process, as shown in fig. 5, the determining module 32 may specifically include: calculation section 321 and determination section 322;
the calculating unit 321 is configured to calculate a determination interval of each coal mining cycle process in the determination interval according to the set of key time points of each hydraulic support;
the determining unit 322 is configured to determine the determination interval as a coal mining cycle process if it is determined that the ratio of the number of the key time points in the determination interval to the total number in the set of key time points in the determination interval is greater than a second preset threshold.
Correspondingly, the calculating unit 321 is specifically configured to determine a key time point of each hydraulic support in each resistance reducing action, and construct a key time point set; calculating the average value of the key time points in the set of the key time points of the judgment interval, and determining the average value of the judgment interval as the average time point; and calculating the section endpoint of the judgment section according to the key time point of the judgment section and the average time point of the judgment section.
Correspondingly, in order to determine the interval endpoint of the determination interval, the calculating unit 321 is specifically configured to determine a key time point greater than or equal to the average time point of the determination interval as a first key time point, and determine a key time point smaller than the average time point of the determination interval as a second key time point; calculating a left interval endpoint of the judgment interval by using a first key time point of the judgment interval and a first calculation formula; and calculating the right interval endpoint of the judgment interval by using the second key time point of the judgment interval and a second calculation formula.
In a specific application scenario, in order to calculate the top plate pressure, as shown in fig. 5, the calculating module 33 may specifically include: a determination unit 331, a calculation unit 332;
the determining unit 331 is configured to determine a key time point in the determination interval as a target key time point, and determine a working resistance of the hydraulic support corresponding to the target key time point in the determination interval as a cycle end resistance;
and a calculating unit 332, which is used for calculating the average value of the resistance at the end of the judging interval cycle and determining the judging interval average value as the roof pressure in the judging interval coal mining cycle process.
It should be noted that other corresponding descriptions of the functional units involved in the calculation device of the top plate pressure provided by the present embodiment may refer to the corresponding descriptions in fig. 1 to fig. 2, and are not described redundantly here.
Those skilled in the art will appreciate that the computing device of the ceiling pressure provided in the embodiments of the present application does not constitute a limitation to a physical device and may include more or fewer components, or some components in combination, or a different arrangement of components.
Through the application of the technical scheme, compared with the prior art, the method includes the steps that firstly, a high-precision and high-sampling-frequency mine pressure monitoring system is adopted to collect the working resistance of the hydraulic supports on the whole working face in real time, a hydraulic support working resistance time sequence change curve is drawn, the maximum support load value and the key time point of each hydraulic support on the whole working face in the coal mining cycle process are calculated one by one, the resistance reduction process generated by non-moving supports is screened out from the calculated numerous obvious resistance reduction processes according to the working resistance change characteristics of the hydraulic supports in the moving support process, and therefore correct cycle end resistance and corresponding time are identified. And finally, calculating the pressure of the top plate by using the circulating end resistance of the hydraulic support in the coal mining circulating process. Through the scheme, the whole working face mine pressure can be identified in real time and automatically, the top plate pressure step pitch calculation is carried out according to the whole working face mine pressure, mine pressure data which are generated due to poor working conditions of the support and manual misoperation and cannot reflect the motion rule of the top plate are reduced, the calculation result is more accurate, comprehensive and accurate summarization of the mine pressure rule of the top plate is facilitated, the analysis automation level of the mine pressure data is improved, the manpower input is reduced, and the safety of coal mining is further guaranteed.
The present application also provides a non-transitory computer storage medium storing computer-executable instructions configured as the top plate pressure calculation method as described above.
The present application further provides an electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the ceiling pressure calculation method as described above.
The apparatus for performing the top plate pressure calculation method as described above may further include: an input device and an output device. The processor, memory, input device, and output device may be connected by a bus or other means.
The memory, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes various functional applications of the server and data processing by executing nonvolatile software programs, instructions and modules stored in the memory, that is, implements the top plate pressure calculation method in the above method embodiment.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the stored data area may store data created according to the use of the top plate pressure calculation method, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid state storage device.
The input device may receive input numeric or character information and generate key signal inputs related to user settings and function controls related to the top plate pressure calculation method. The output device may include a display device such as a display screen.
The one or more modules are stored in the memory and, when executed by the one or more processors, perform the top plate pressure calculation method of any of the method embodiments described above.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The electronic device of embodiments of the present invention exists in a variety of forms, including but not limited to:
(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.
(3) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices.
(4) A server: the device for providing the computing service comprises a processor, a hard disk, a memory, a system bus and the like, and the server is similar to a general computer architecture, but has higher requirements on processing capacity, stability, reliability, safety, expandability, manageability and the like because of the need of providing high-reliability service.
(5) And other electronic devices with data interaction functions.
Based on such understanding, the technical solution of the present invention may be embodied in a form of a software product, which is stored in a storage medium and includes instructions for causing a mobile terminal (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and not to limit the same; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A top plate pressure calculation method, comprising:
screening the maximum support load value of each hydraulic support and the corresponding key time point;
determining a coal mining cycle process according to the maximum support load value and the key time point;
and calculating the pressure of the top plate by utilizing the circulation end resistance of the hydraulic support in the coal mining circulation process.
2. The method of claim 1, wherein screening the maximum support load value for each hydraulic support and the corresponding critical time point comprises:
collecting the working resistance of the hydraulic support on the whole working face in real time, and drawing a hydraulic support time sequence curve by taking time as an abscissa and the working resistance of the hydraulic support as an ordinate;
calculating the difference value of the working resistance of each adjacent hydraulic support according to the hydraulic support time sequence curve;
and comparing the difference value with a first preset threshold value, determining the maximum value of the support load according to the comparison result, and determining the time point corresponding to the maximum value of the support load as the corresponding key time point.
3. The method of claim 2, wherein comparing the difference with a first preset threshold, determining a maximum stent load based on the comparison, and determining a time point corresponding to the maximum stent load as a corresponding key time point comprises:
if the difference value of the working resistance of the hydraulic support at the current time point and the working resistance of the hydraulic support at the next time point is smaller than a first preset threshold value, filtering the working resistance of the hydraulic support at the current time point;
and if the working resistance difference value of the hydraulic support is judged to be larger than or equal to a first preset threshold value, screening out the maximum value of the working resistance of the hydraulic support in a preset historical time period according to the timing curve of the hydraulic support, determining the maximum value of the working resistance of the hydraulic support as the maximum value of the load of the support, and determining the corresponding time point as the corresponding key time point.
4. The method of claim 1, wherein determining a coal mining cycle course from the support load maximum and the key time point comprises:
calculating a judgment interval of each coal mining cycle process according to the key time point set of each hydraulic support;
and if the proportion of the number of the key time points in the judgment interval to the total number in the key time point set is larger than a second preset threshold value, judging the judgment interval as a coal mining circulation process.
5. The method of claim 4, wherein calculating a decision interval for each coal mining cycle based on the set of key time points for each hydraulic support comprises:
determining key time points of each hydraulic support in each resistance reducing action, and constructing a key time point set;
calculating the average value of the key time points in the key time point set, and determining the average value as an average time point;
and calculating the interval end point of the judgment interval according to the key time point and the average time point.
6. The method of claim 5, wherein calculating an interval end point for a decision interval based on the key time point and the average time point comprises:
determining the key time points which are greater than or equal to the average time point as first key time points, and determining the key time points which are less than the average time point as second key time points;
calculating a left interval endpoint of the judgment interval by using the first key time point and a first calculation formula;
and calculating the right interval endpoint of the judgment interval by using the second key time point and a second calculation formula.
7. The method of claim 6, wherein the first calculation formula and the second calculation formula are both:
wherein T1 is the left interval endpoint, T2 is the right interval endpoint, TijGenerating a key time point corresponding to the maximum value of the support load when the jth hydraulic support generates the jth resistance reducing action when
When t isijIs the first critical time point when
When t isijIs a second key time point;
is the average time point;
the average value of the difference value between the first key time point or the second key time point and the average time point is obtained.
8. The method of any one of claims 1-7, wherein calculating the roof pressure using the hydraulic support end-of-cycle resistance during a coal mining cycle comprises:
determining a key time point in the judgment interval as a target key time point, and determining the working resistance of the hydraulic support corresponding to the target key time point as the resistance at the end of the cycle;
the average of the end-of-cycle resistances is calculated and determined as the roof pressure during the coal mining cycle.
9. A non-transitory computer storage medium storing computer-executable instructions configured for the method of ceiling pressure calculation according to any of claims 1-8.
10. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the ceiling pressure calculation method of any of claims 1-8.
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