阅读说明：本技术 一种综放工作面放顶煤智能控制方法 (Intelligent control method for fully mechanized caving face top coal caving ) 是由 张宁波 刘怀东 刘长友 王晨煜 唐慧波 吴占伟 王颖 李泽鑫 于 2019-12-31 设计创作，主要内容包括：本发明公开了一种综放工作面放顶煤智能控制方法,步骤如下：S1：在每台综放工作面放顶煤液压支架中均放置放顶煤智能控制器、自然射线煤矸识别探测器和电液控制器；S2：通过实验的方法确定出关窗阈值；S3：选出初始工作的综放工作面放顶煤液压支架,同时选出的综放工作面放顶煤液压支架根据关窗阈值控制放煤口的关闭状态；S4：向选出的综放工作面放顶煤液压支架中的结束开关输入低或高电平,同时控制相邻放煤口的关闭状态；S5：重复步骤S4,直至所有综放工作面放顶煤液压支架均进行工作。本发明可以避免放煤工序中人员操作的随机性,有利于综放开采顶煤放出率的提高和混矸率的降低,也有利于实现综放工作面的采放平衡,提高工作面生产效率。(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.)

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).

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.