CN110878704A - Intelligent control method for fully mechanized caving face top coal caving - Google Patents
Intelligent control method for fully mechanized caving face top coal caving Download PDFInfo
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Abstract
The invention discloses an intelligent control method for caving top coal of a fully mechanized caving face, which comprises the following steps: s1: a caving coal intelligent controller, a natural ray coal and gangue identification detector and an electro-hydraulic controller are arranged in each fully mechanized caving face caving coal hydraulic support; s2: determining a window closing threshold value through an experimental method; s3: selecting a top coal caving hydraulic support of the fully mechanized caving face for initial work, and controlling the closing state of a coal caving port by the selected top coal caving hydraulic support of the fully mechanized caving face according to a window closing threshold value; s4: inputting a low or high level to an end switch in the top coal caving hydraulic support of the selected fully mechanized caving face, and simultaneously controlling the closing state of adjacent coal caving ports; s5: and repeating the step S4 until all the top coal caving hydraulic supports of the fully mechanized caving face work. The invention can avoid the randomness of manual operation in the coal caving process, is beneficial to the improvement of the fully mechanized top coal caving rate and the reduction of the gangue mixing rate, is also beneficial to the realization of the mining balance of a fully mechanized caving face, and improves the production efficiency of the face.
Description
Technical Field
The invention relates to the technical field of caving coal mining, in particular to an intelligent control method for caving coal of a fully mechanized caving face.
Background
Intelligent mining is the necessary route for coal development. The fully-mechanized top coal caving mining technology is one of the most effective methods for realizing high-efficiency intensive production of thick and ultra-thick coal seams, and the coal caving process is the core of fully-mechanized top coal caving, but the top coal caving process of the fully-mechanized top coal caving still depends on manual operation of a hydraulic support according to the principle of 'finding gangue and closing windows' for control, so that great humanity is achieved, and the situations that resources are wasted and the coal quality is influenced due to the over-caving and under-caving conditions in the coal caving process are difficult to avoid.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an intelligent control method for fully mechanized caving face top coal caving, aiming at the problems of over-caving and under-caving in the coal caving process in the existing fully mechanized top coal caving mining technology.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
an intelligent control method for top coal caving of a fully mechanized caving face specifically comprises the following steps:
s1: the method comprises the following steps that N fully mechanized caving face caving coal hydraulic supports are placed in a coal seam, the N fully mechanized caving face caving coal hydraulic supports are mutually connected in series, and meanwhile, an intelligent caving coal controller, a natural ray coal and gangue identification detector and an electro-hydraulic controller are placed in each fully mechanized caving face caving coal hydraulic support;
s2: determining the composition change and the corresponding radiation intensity of the coal bed and the rock stratum by a chemical method, and determining a window-closing threshold value by an experimental method;
s3: selecting an initial fully mechanized caving face caving coal hydraulic support from N fully mechanized caving face caving coal hydraulic supports, and controlling the closing state of a coal caving port in the selected fully mechanized caving face caving coal hydraulic support according to a window closing threshold value by using a caving coal intelligent controller, a natural ray coal gangue identification detector and an electro-hydraulic controller in the selected fully mechanized caving face caving coal hydraulic support;
s4: inputting a low level or a high level to an end switch of a caving coal intelligent controller in the selected fully mechanized caving face caving coal hydraulic support according to the closing state of the caving coal port, and simultaneously controlling the closing state of the caving coal port in the adjacent fully mechanized caving face caving coal hydraulic support;
s5: and repeating the step S4 until all the top coal caving hydraulic supports of the fully mechanized caving face work.
Further, in step S1, an intelligent controller for top coal caving, a natural ray coal gangue identification detector and an electrohydraulic controller are placed in the hydraulic support for top coal caving of the fully mechanized caving face, specifically:
the natural ray coal and gangue identification detector is installed at the tail beam lower side of each hydraulic support of the fully mechanized caving face and leans on the insertion plate root, the electro-hydraulic controller is arranged at the middle position of a rear upright post of the hydraulic support, and the caving coal intelligent controller is installed above the electro-hydraulic controller in the middle of two upright posts of the hydraulic support.
Furthermore, the intelligent controller for top coal caving receives radiation intensity data of a natural ray coal and gangue identification detector, obtains window opening/closing time according to the radiation intensity data, and simultaneously sends a window opening/closing instruction to the electro-hydraulic controller to control the window opening/closing action of the coal discharging port.
Further, in step S3, controlling the closing state of the coal discharge port in the selected hydraulic support for top coal caving of the fully mechanized caving face is as follows:
s3.1: in the selected top coal caving hydraulic support of the fully mechanized caving face, a singlechip in the intelligent top coal caving controller receives a radioactive intensity digital signal generated by a natural ray coal gangue identification detector;
s3.2: the single chip microcomputer analyzes and processes the radioactive intensity digital signal and judges the content of gangue in a coal gangue mixture falling to a coal discharge port in the fully mechanized caving face top coal caving hydraulic support;
when the content of the gangue in the coal gangue mixture falling to the coal discharge port does not reach a window closing threshold value, keeping the coal discharge port in the top coal discharge hydraulic support of the selected fully mechanized caving face to continue discharging coal;
and when the content of the gangue in the coal gangue mixture falling to the coal discharge port reaches a window closing threshold value, closing the coal discharge port in the top coal hydraulic support of the selected fully mechanized caving face.
Furthermore, two accumulators are arranged in the single-chip microcomputer in each top coal caving intelligent controller, wherein one accumulator accumulates the number of signals input into the single-chip microcomputer, and the other accumulator accumulates the number of signals which are input into the single-chip microcomputer and are greater than a window closing threshold value.
Further, in step S4, controlling a closing state of a coal discharge port in the hydraulic support for top coal caving of the adjacent fully mechanized caving face, specifically:
when the coal caving port in the selected fully mechanized caving face top coal caving hydraulic support continues to perform coal caving, an end switch of a top coal caving intelligent controller in the selected fully mechanized caving face top coal caving hydraulic support inputs a low level, and meanwhile, the coal caving port in the adjacent fully mechanized caving face top coal caving hydraulic support is kept in a closed state;
when the coal caving port in the selected fully mechanized caving face top coal caving hydraulic support is closed, the end switch of the top coal caving intelligent controller in the selected fully mechanized caving face top coal caving hydraulic support inputs a high level, and simultaneously the high level is input into a starting circuit switch of the top coal caving intelligent controller in the adjacent fully mechanized caving face top coal caving hydraulic support, and the coal caving port of the top coal caving intelligent controller in the adjacent fully mechanized caving face top coal caving hydraulic support is opened.
Further, in the step S3.2, the determination process of the content of the gangue in the coal gangue mixture falling to the coal tap hole is specifically as follows:
the first step is as follows: the single chip microcomputer collects a radioactive intensity digital signal generated by a natural ray coal and gangue identification detector, compares the radioactive intensity digital signal with a window closing threshold value, and increases 1 to both the two accumulators when the radioactive intensity digital signal is greater than the window closing threshold value;
when the digital signal of the radioactivity intensity is not more than a closing window threshold value, the first accumulator does not work, and the second accumulator is increased by 1;
the second step is that: setting a preset signal acquisition number, judging whether 80% of signal data in the signal data acquired by the single chip microcomputer exceeds the window closing threshold value or not when the signal number acquired by the single chip microcomputer reaches the preset signal acquisition number, if not, keeping an ending switch of the intelligent top coal caving controller to input a low level, and continuing to perform coal caving;
and otherwise, inputting a high level to an end switch of the intelligent controller for top coal caving, closing the coal caving port, and opening the coal caving port of the next intelligent controller for top coal caving.
Further, the number of the pre-signal acquisition is selected according to the sampling frequency of the natural ray coal and gangue identification detector.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
(1) compared with the handheld top coal caving control, the intelligent control method for top coal caving of the fully mechanized caving face can improve the caving rate of the fully mechanized caving mining top coal on the basis of high-efficiency and accurate automatic identification of coal and gangue, and meanwhile, a coal caving worker does not need to perform machine tracing operation, so that the working efficiency is improved, and the coal mining worker is far away from the severe environment of the underground working face;
(2) the intelligent control method for the fully mechanized caving face top coal caving can avoid the randomness of human operation in the coal caving process, realize the control of coal caving and equivalent coal caving in a real sense, is favorable for improving the top coal caving rate of fully mechanized caving mining and reducing the gangue mixing rate, is favorable for realizing the mining balance of the fully mechanized caving face and improving the production efficiency of the working face, and has simple operation, good controllability and wide practicability.
Drawings
FIG. 1 is a schematic flow chart of an intelligent control method for top coal caving of a fully mechanized caving face of the invention;
FIG. 2 is a schematic illustration of the top coal caving process of the present invention;
FIG. 3 is an oblique view of the probe installation of the present invention;
FIG. 4 is a side view of the detector of the present invention mounted;
FIG. 5 is a front view of the detector of the present invention installed;
FIG. 6 is a front view of the hydraulic mount of the present invention;
FIG. 7 is a schematic diagram of the automatic take-over of the hydraulic mount of the present invention;
FIG. 8 is a comparison flow chart of the signal collected in accordance with the present invention;
the numbers in the figures correspond to part names:
1. a coal seam; 2. a rock formation; 3. a hydraulic support; 4. crushing coal; 5. gangue; 6. a coal discharge port; 7. a scraper conveyor; 8. a top coal caving intelligent controller; 9. a natural ray coal gangue identification detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. The described embodiments are a subset of the embodiments of the invention and are not all embodiments of the invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Example 1
Referring to fig. 1, the embodiment provides an intelligent control method for fully mechanized caving face top coal caving, which specifically includes the following steps:
step S1: referring to fig. 2, N hydraulic supports 3 for top coal caving of the fully mechanized caving face are all placed inside the coal seam 1, and the N hydraulic supports 3 for top coal caving of the fully mechanized caving face are mutually connected in series. According to the position of each hydraulic support 3 of the fully mechanized caving face, an intelligent controller 8 for caving the top coal, a natural ray coal and gangue identification detector 9 and an electro-hydraulic controller are placed. Referring to fig. 3, 4 and 5, the natural ray coal gangue identification detector 9 uses the lower side of the tail beam as a mounting point, and a detection surface is parallel to the coal caving body. Specifically, the intelligent controller 8 for top coal caving is placed beside the electrohydraulic control of the hydraulic support, namely the intelligent controller 8 for top coal caving is installed above the electrohydraulic controller in the middle of two upright posts of the hydraulic support 3, the natural ray coal gangue identification detector 9 is installed at the lower side of a tail beam of each hydraulic support 3 of the fully mechanized caving face close to the root of an inserting plate, and the electrohydraulic controller is arranged in the middle of the rear upright post of the hydraulic support 3.
In the fully mechanized top coal caving process, low coal of the coal bed 1 is cut, a rock stratum 2 is arranged above the coal bed 1, top coal is supported by a hydraulic support 3, and as coal mining progresses and the hydraulic support 3 moves forwards, part of the rock stratum 2 and the coal bed 1 are crushed, so that gangue 5 and crushed coal 4 are formed. The top coal is discharged from the coal discharge port 6, and in the process of discharging the top coal, part of gangue 5 is discharged along with the discharge of the top coal and falls on the scraper conveyor 7.
Wherein the intelligent controller 8 for top coal caving is arranged as an intermediary connecting device between the natural ray coal gangue identification detector 9 and the electrohydraulic controller. Specifically, the intelligent top coal caving controller 8 receives radiation intensity data of the natural ray coal and gangue identification detector 9, and carries out real-time processing and analysis on the radiation intensity data of the natural ray coal and gangue identification detector 9, so as to obtain window opening/closing time, and sends a window opening/closing instruction to the electro-hydraulic controller, so as to control the window opening/closing action of the coal discharging port 6, and further realize intelligent control of a coal discharging process.
Step S2: the occurrence condition of the top plate is investigated, the component change and the corresponding radiation intensity are measured by a chemical method, and the window closing threshold value is determined by an experimental method. Wherein the roof is the general term for the coal seam 1 and the rock stratum 2.
Step S3: and (4) selecting the fully mechanized caving face caving coal hydraulic support 3 which is initially operated from the N fully mechanized caving face caving coal hydraulic supports 3 in the step (S1), and controlling the closing state of the coal outlet 6 in the selected fully mechanized caving face caving coal hydraulic support 3 according to a closing window threshold value by using the intelligent controller 8, the natural ray coal gangue identification detector 9 and the electro-hydraulic controller which are arranged in the selected fully mechanized caving face caving coal hydraulic support 3. The method comprises the following specific steps:
step S3.1: referring to fig. 6, the start button a of the controller in the selected fully mechanized caving face caving coal hydraulic support 3 is manually pressed by the caving worker, thereby starting the intelligent controller 8 for caving coal in the selected fully mechanized caving face caving coal hydraulic support 3. Meanwhile, a single chip in the intelligent controller 8 for caving the top coal in the fully mechanized caving face caving coal hydraulic support 3 selected receives the radioactive intensity digital signal generated by the natural ray coal gangue identification detector 9.
Referring to fig. 7, when the coal discharge port 6 of the intelligent controller 8 for top coal discharge in the selected hydraulic support 3 for top coal discharge of the fully mechanized caving face starts to discharge coal, the single chip microcomputer of the intelligent controller 8 for top coal discharge in the selected hydraulic support 3 for top coal discharge of the fully mechanized caving face receives a wireless signal transmitted by the bluetooth of the natural ray coal and gangue identification detector 9 through the bluetooth module at a sampling frequency of 500 Hz. Specifically, through the connection between the bluetooth module and the single chip microcomputer, the radioactive intensity digital signal generated by the natural ray coal and gangue identification detector 9 is transmitted to the single chip microcomputer of the intelligent controller 8 for top coal caving in the top coal caving hydraulic support 3 of the selected fully mechanized caving face.
In this embodiment, two accumulators are respectively disposed in all the singlechips in the intelligent controller 8 for caving coal, where the two accumulators are respectively selected as an accumulator X and an accumulator Y, where the accumulator X accumulates the number of signals input to the singlechips, and the accumulator Y accumulates the number of signals input to the singlechips that is greater than a window-closing threshold.
Step S3.2: the singlechip analyzes and processes the radioactive intensity digital signals generated by the natural ray coal and gangue identification detector 9, and judges the content of the gangue in the coal and gangue mixture falling to the coal discharge port 6 in the top coal hydraulic support 3 of the selected fully mechanized caving face according to the analysis result. The judgment result is specifically as follows:
and when the content of the gangue in the gangue mixture falling to the coal outlet 6 in the fully mechanized caving face top coal caving hydraulic support 3 does not reach a window closing threshold value, keeping the coal outlet 6 in the fully mechanized caving face top coal caving hydraulic support 3 to continue to discharge coal.
And when the content of gangue in the gangue mixture falling to the coal outlet 6 in the top coal hydraulic support 3 of the selected fully mechanized caving face reaches a window closing threshold value, closing the coal outlet 6 in the top coal hydraulic support 3 of the selected fully mechanized caving face.
Referring to fig. 8, the determination of the content of gangue in the gangue mixture falling to the coal tap hole is as follows:
the first step is as follows: when the first signal is input into the single chip microcomputer, the single chip microcomputer collects a radioactivity intensity digital signal generated by the natural ray coal and gangue identification detector 9, the radioactivity intensity digital signal is compared with a closed window threshold value, when the radioactivity intensity digital signal is larger than the closed window threshold value, both the accumulators are increased by 1, namely the accumulator X and the accumulator Y are increased by 1, namely the accumulator X is 1, and the accumulator Y is 1.
When the digital signal of the radioactivity intensity is not greater than the closing window threshold, the first accumulator does not work, the second accumulator is increased by 1, namely the accumulator X is kept unchanged, and the accumulator Y is increased by 1, namely the accumulator X is 0, and Y is 1.
The second step is that: the number of the pre-signal acquisition is set, specifically, the number of the pre-signal acquisition is selected according to the sampling frequency of the natural ray coal and gangue identification detector 9, in this embodiment, the sampling frequency of the natural ray coal and gangue identification detector 9 is 100 hz, so that the number of the pre-signal acquisition is set to 10. Similarly, with the increase of the sampling frequency of the natural ray coal gangue identification detector 9, the collection number of the top coal caving intelligent controller 8 can be increased.
And when the number of the signals acquired by the single chip microcomputer reaches the preset number of the signals acquired, namely 10 signals, judging whether 80% of the 10 signal data acquired by the single chip microcomputer exceed the window closing threshold value, if not, keeping the ending switch of the intelligent top coal caving controller 8 to input a low level, and continuing to perform coal caving. Otherwise, inputting a high level to an end switch of the intelligent controller 8 for top coal caving, closing the coal caving port 6, and opening the coal caving port 6 of the next intelligent controller 8 for top coal caving.
In this embodiment, it is determined whether the value of the accumulator Y is less than 8 when the accumulator X is equal to 10, the coal discharge is continued when the accumulator Y is less than 8, and the coal discharge port 6 is closed when the accumulator Y is greater than or equal to 8.
Step S4: and inputting a low level or a high level to an end switch of a caving coal intelligent controller 8 in the selected fully mechanized caving face caving coal hydraulic support 3 according to the closing state of the coal outlet 6 in the selected fully mechanized caving face caving coal hydraulic support 3, and simultaneously controlling the closing state of the coal outlet 6 in the adjacent fully mechanized caving face caving coal hydraulic support 3. The method specifically comprises the following steps:
when the coal caving port 6 in the selected fully mechanized caving face top coal caving hydraulic support 3 continues to perform coal caving, a low level is input to an end switch of a top coal caving intelligent controller 8 in the selected fully mechanized caving face top coal caving hydraulic support 3, and meanwhile, the coal caving port 6 in the adjacent fully mechanized caving face top coal caving hydraulic support 3 keeps a closed state.
When the coal caving port 6 in the selected fully mechanized caving face top coal caving hydraulic support 3 is closed, the end switch of the top coal caving intelligent controller 8 in the selected fully mechanized caving face top coal caving hydraulic support 3 inputs a high level, the high level is input into a starting circuit switch of the top coal caving intelligent controller 8 in the adjacent fully mechanized caving face top coal caving hydraulic support 3, and the coal caving port 6 of the top coal caving intelligent controller 8 in the adjacent fully mechanized caving face top coal caving hydraulic support 3 is opened.
Step S5: and (8) repeating the step (S4) until all the top coal caving hydraulic supports 3 of the fully mechanized caving face work.
In this embodiment, the coal discharge port 6 is in a closed state before each hydraulic support 3 works, the start reset circuit of the intelligent controller 8 for top coal discharge inputs a low level, and the control circuit inputs a high level. Except the top coal caving intelligent controllers 8 in the top coal caving hydraulic support 3 of the selected fully mechanized caving face, the start of each top coal caving intelligent controller 8 is controlled by the previous controller. When the previous top coal caving intelligent controller 8 finishes working, the control system inputs a high level to the end switch circuit, and simultaneously the high level is also input to the starting circuit switch of the next top coal caving intelligent controller 8, and the coal discharging port 6 of the next top coal caving intelligent controller 8 is opened.
Specifically, at the end of each cycle, the single-chip outputs the value of the accumulator Y in the form of a digital signal, which is converted by a D/a converter into an analog signal proportional to the magnitude of its value. If the value of the output signal is 7, the voltage of 7V is obtained after passing through a D/A converter, and the analog signal obtained by conversion is compared with the power supply voltage of 7.5V through a voltage comparator. If the analog signal is less than 8V, inputting low level to the electromagnetic valve control circuit, and inputting low level to the starting circuit of the next caving coal intelligent controller 8 through the transmission jack B shown in figure 6 and the starting jack A' of the next caving coal intelligent controller 8 connected with the transmission jack B by a lead, and meanwhile, keeping the coal discharge port 6 in an open state, and continuing to discharge coal.
The starting circuit of the next top coal caving intelligent controller 8 inputs low level, the singlechip is still kept in a power-off state without starting reset, and the coal discharging port 6 is kept in a closed state continuously.
If the analog signal is not less than 8V, a high level is output to the electromagnetic valve control circuit and a starting reset circuit of the next top coal caving intelligent controller 8, and the high level excites the control circuit to further control the electromagnetic valve to close the coal caving port 6. The starting circuit of the next top coal caving intelligent controller 8 inputs high level, the single chip microcomputer is started to reset after being powered on, signals of the natural ray coal and gangue identification detector 9 are received through the Bluetooth module, and circulation is started. Generally, after the first cycle, the voltage comparator will input a high level to the control circuit to activate the control circuit, which in turn controls the solenoid valve to open the coal discharge port 6.
The present invention and its embodiments have been described in an illustrative manner, and are not to be considered limiting, as illustrated in the accompanying drawings, which are merely exemplary embodiments of the invention and not limiting of the actual constructions and methods. Therefore, if the person skilled in the art receives the teaching, the structural modes and embodiments similar to the technical solutions are not creatively designed without departing from the spirit of the invention, and all of them belong to the protection scope of the invention.
Claims (8)
1. An intelligent control method for top coal caving of a fully mechanized caving face is characterized by comprising the following steps:
s1: n fully mechanized caving face top coal caving hydraulic supports (3) are all placed in a coal seam (1), the N fully mechanized caving face top coal caving hydraulic supports (3) are mutually connected in series, and simultaneously a top coal caving intelligent controller (8), a natural ray coal gangue identification detector (9) and an electro-hydraulic controller are placed in each fully mechanized caving face top coal caving hydraulic support (3);
s2: determining the composition change and the corresponding radiation intensity of the coal seam (1) and the rock stratum (2) by a chemical method, and determining a window-closing threshold value by an experimental method;
s3: selecting an initial fully mechanized caving face caving coal hydraulic support (3) from N fully mechanized caving face caving coal hydraulic supports (3), and controlling the closing state of a coal outlet (6) in the selected fully mechanized caving face caving coal hydraulic support (3) according to a window closing threshold value by using a caving coal intelligent controller (8), a natural ray coal gangue identification detector (9) and an electro-hydraulic controller in the selected fully mechanized caving face caving coal hydraulic support (3);
s4: inputting a low level or a high level to an end switch of a caving coal intelligent controller (8) in the selected fully mechanized caving face caving coal hydraulic support (3) according to the closing state of the caving coal port (6), and simultaneously controlling the closing state of the caving coal port (6) in the adjacent fully mechanized caving face caving coal hydraulic support (3);
s5: and repeating the step S4 until all the top coal caving hydraulic supports (3) of the fully mechanized caving face work.
2. The intelligent control method for the fully mechanized caving face caving coal according to claim 1, wherein in the step S1, an intelligent controller (8) for the caving coal, a natural ray coal gangue identification detector (9) and an electro-hydraulic controller are placed in the hydraulic support (3) for the fully mechanized caving face caving coal, and specifically:
natural ray coal gangue discernment detector (9) are installed and are leaned on picture peg root department at the tail-beam downside of every hydraulic support (3) of fully mechanized caving face, electrohydraulic controller sets up in hydraulic support (3) rear column intermediate position, the top of electrohydraulic controller is installed in the middle of two stands of hydraulic support (3) in caving coal intelligent control ware (8).
3. The intelligent control method for the caving of the fully mechanized caving face according to claim 2, wherein the intelligent controller (8) for the caving receives radiation intensity data of a natural ray coal gangue identification detector (9), obtains window opening/closing time according to the radiation intensity data, and sends a window opening/closing command to the electro-hydraulic controller to control the window opening/closing action of the coal outlet (6).
4. The intelligent control method for fully mechanized caving face caving coal according to claim 1, 2 or 3, wherein in the step S3, the closing state of the coal outlet (6) in the selected hydraulic support (3) for fully mechanized caving face caving coal is controlled as follows:
s3.1: in the selected top coal caving hydraulic support (3) of the fully mechanized caving face, a singlechip in the top coal caving intelligent controller (8) receives a radioactive intensity digital signal generated by a natural ray coal gangue identification detector (9);
s3.2: the single chip microcomputer analyzes and processes the radioactive intensity digital signal, and judges the content of gangue in a gangue mixture falling to a coal discharge port (6) in the top coal hydraulic support (3) of the selected fully mechanized caving face;
when the content of the gangue in the coal gangue mixture falling to the coal discharge port (6) does not reach a window closing threshold value, keeping the coal discharge port (6) in the selected fully mechanized caving face top coal discharging hydraulic support (3) to continue discharging coal;
and when the content of the gangue in the gangue mixture falling to the coal discharge port (6) reaches a window closing threshold value, closing the coal discharge port (6) in the selected fully mechanized caving face top coal discharging hydraulic support (3).
5. The intelligent control method for caving coal of a fully mechanized caving face according to claim 4, characterized in that two accumulators are arranged in all the single chip microcomputers in the intelligent controller (8) for caving coal, wherein one of the accumulators accumulates the number of signals input to the single chip microcomputers, and the other accumulator accumulates the number of signals which are greater than a window closing threshold value and input to the single chip microcomputers.
6. The intelligent control method for fully mechanized caving face caving coal according to claim 5, wherein in the step S4, the closing state of the coal outlet (6) in the hydraulic support (3) of the fully mechanized caving face caving coal is controlled, specifically:
when the coal caving port (6) in the selected fully mechanized caving face top coal caving hydraulic support (3) continues to perform coal caving, an end switch of a top coal caving intelligent controller (8) in the selected fully mechanized caving face top coal caving hydraulic support (3) inputs a low level, and meanwhile, the coal caving port (6) in the adjacent fully mechanized caving face top coal caving hydraulic support (3) keeps a closed state;
when the coal caving port (6) in the selected fully mechanized caving face top coal caving hydraulic support (3) is closed, the end switch of the top coal caving intelligent controller (8) in the selected fully mechanized caving face top coal caving hydraulic support (3) inputs a high level, the high level is input into a starting circuit switch of the top coal caving intelligent controller (8) in the adjacent fully mechanized caving face top coal caving hydraulic support (3), and the coal caving port (6) of the top coal caving intelligent controller (8) in the adjacent fully mechanized caving face top coal caving hydraulic support (3) is opened.
7. The intelligent control method for the top coal caving of the fully mechanized caving face according to claim 5, wherein in the step S3.2, the determination process of the content of the gangue in the gangue mixture falling to the coal caving mouth (6) is as follows:
the first step is as follows: the single chip microcomputer collects a radioactive intensity digital signal generated by a natural ray coal gangue identification detector (9), the radioactive intensity digital signal is compared with a window closing threshold value, and when the radioactive intensity digital signal is greater than the window closing threshold value, both the two accumulators are increased by 1;
when the digital signal of the radioactivity intensity is not more than a closing window threshold value, the first accumulator does not work, and the second accumulator is increased by 1;
the second step is that: setting a preset signal acquisition number, judging whether 80% of signal data in the signal data acquired by the single chip microcomputer exceeds the window closing threshold value or not when the signal number acquired by the single chip microcomputer reaches the preset signal acquisition number, if not, keeping an end switch of the intelligent top coal caving controller (8) to input a low level, and continuing to perform coal caving;
and otherwise, inputting a high level to an end switch of the top coal caving intelligent controller (8), closing the coal caving port (6), and opening the coal caving port (6) of the next top coal caving intelligent controller (8).
8. The intelligent control method for the top coal caving of the fully mechanized caving face according to claim 7, wherein the number of the pre-signal acquisition is selected according to the sampling frequency of a natural ray coal gangue identification detector (9).
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