CN107130989A - Coal Caving Method of Hydraulic Support in Fully Mechanized Caving Face - Google Patents

Abstract

The invention discloses a coal caving method for a hydraulic support of a fully mechanized caving face, wherein the hydraulic support is a hydraulic support adopting an electric hydraulic control system, and the coal caving method comprises the following steps: step 1, evaluating the caving performance of top coal on a working face in real time; step 2, determining a coal caving mode of a working face; step 3, establishing a hydraulic support coal caving port mode matched with the working face coal caving mode, and finally executing coal caving operation; step 4, monitoring the scraper conveyor in real time, and reducing or closing the coal discharge port of the hydraulic support when the set threshold value is exceeded, wherein the invention has the beneficial effects that: (1) safety indexes, monitoring indexes and progress indexes are included in the coal caving method, and on the premise of ensuring safety and yield, standardized coal caving is realized; (2) the coal discharging device replaces manual coal discharging, reduces the labor intensity of workers and improves the working environment; (3) by refining and quantizing the indexes, a foundation is laid for the comprehensive implementation of intelligent mining of the top coal caving face.

Description

Coal Caving Method of Hydraulic Support in Fully Mechanized Caving Face

technical field

The invention relates to a coal discharging method of a fully mechanized caving face, in particular to a coal discharging method of a hydraulic support of a fully mechanized caving face, belonging to the technical field of coal mining production.

Background technique

For the top coal caving face, coal caving operation is the most important process, which not only affects the recovery rate of coal resources, but also has an important impact on personnel safety and equipment safety. At present, the coal discharge operation of the top coal caving face in my country mainly relies on manual operation. Due to the randomness and irregularity of human operation, manual operation is not only inefficient and labor intensive, but also affects the safety of equipment and the quality of coal discharge. It often occurs that the rear scraper conveyor is crushed to death, and large pieces of gangue in the goaf fall into the frame.

Contents of the invention

In order to overcome the defects of high labor intensity, low efficiency, poor standardization, large randomness, and many safety hazards in the coal caving operation in the fully mechanized caving face, the invention provides a method for caving coal with hydraulic supports in the fully mechanized caving face.

In order to achieve the above object, the technical solution of the present invention is: a method for discharging coal with a hydraulic support in a fully mechanized caving face, the hydraulic support is a hydraulic support using an electro-hydraulic control system, and the method for discharging coal includes the following steps:

Step 1. Real-time evaluation of the top-coal caving performance of the working face;

Step 2. Calculate the carrying capacity of the scraper conveyor and combine it with step 1 to determine the coal discharge method on the working face;

Step 3. Establish a hydraulic support coal discharge port mode that matches the coal discharge mode of the working face, and finally execute the coal discharge operation;

Step 4. Real-time monitoring of the output current of the motor of the scraper machine and the amount of gas gushing out, and when exceeding the set threshold, reduce or close the coal discharge port of the hydraulic support.

As an improvement of the above technical solution, the step 1 includes the following process:

1) Determine the thickness of the top coal and the number and strength of gangue layers;

2) Determine the opening rate of the hydraulic support safety valve on the working face;

3) Determine the percentage of the number of hydraulic supports whose maximum working resistance accounts for 80% of the rated working resistance of the hydraulic support on the working face;

4) Divide the working face into 3~5 sections, each section is manually discharged by two on-site personnel, and record the coal discharge time, the number of times the tail beam swings, and the number of times the inserting plate is extended and retracted, and the recorded results of the two people average;

5) For the values collected in 1) to 4), determine the membership degree value and assign weights, and calculate the comprehensive score through the membership degree matrix method, and finally determine the risk of top-coal caving.

As an improvement of the above technical solution, the coal discharge method described in step 2 includes the number of coal discharge wheels and the number of coal discharge intervals.

As an improvement of the above technical solution, the coal discharge port mode of the hydraulic support is a general term for a series of standardized procedures of when and where the coal discharge mechanism of the hydraulic support performs which coal discharge action.

As an improvement of the above-mentioned technical scheme, the coal discharge port mode is divided into three types, which are the initial discharge mode F1, the normal recovery mode F2, and the closing mode F3; the three coal discharge port modes are respectively different coal discharge sequences, coal discharge Mechanism status and angle;

See Table 1, Table 2 and Table 3 for the coal discharge sequence, coal discharge mechanism status and angle of initial discharge mode F1, normal recovery mode F2, and final mode F3:

Table 1. Initial release mode F1

Table 2. Normal recovery mode F2

Table 3. Closing mode F3

Preferably, there are two scraper thresholds in step 4, which are full-load warning value and overload warning value.

The beneficial effects of the present invention are:

(1) Incorporating safety indicators, monitoring indicators, and progress indicators into the present invention, under the premise of ensuring safety and production, standardized coal discharge is realized, and resource waste caused by manual coal discharge is avoided.

(2) By replacing manual coal caving, the labor intensity of workers is reduced and the working environment is improved.

(3) Through detailed and quantitative indicators, the foundation has been laid for the full implementation of intelligent mining in the top-coal caving face.

Description of drawings

Figure 1 is the F1 cycle diagram of the initial discharge mode of the coal discharge port of the hydraulic support;

Fig. 2 is the F2 cycle diagram of the normal recovery mode of the hydraulic support coal outlet;

Fig. 3 is the F3 cycle diagram of the finishing mode of the coal outlet of the hydraulic support;

Figure 4 is a schematic diagram of the load monitoring of the scraper machine.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Example 1

Taking the top-coal caving working face of a mining electric hydraulic control hydraulic support as an example, in combination with Fig. 1, Fig. 2, Fig. 3, and Fig. 4, the coal caving method of the hydraulic support of the fully mechanized caving face of the present invention is described in detail, including the following steps:

Step 1. Real-time evaluation of the top-coal caving performance of the working face. The specific evaluation method is as follows:

(1) Determine the thickness of the top coal and the number and strength of gangue layers;

According to the comprehensive histogram of the working face of the mine, the top coal thickness H1=15m, the number of layers of gangue inclusions C=8 layers, and the thickness of gangue inclusions H2=1.9m.

(2) Determine the opening rate of the safety valve of the hydraulic support of the working face;

The results shown in Table 4 below can be obtained by analyzing the data obtained from the monitoring system of the mine pressure monitoring system in the working face of the mine.

Table 4 Opening rate of safety valve

(3) Determine the percentage of the number of hydraulic supports whose maximum working resistance accounts for 80% of the rated working resistance;

The results shown in Table 5 below can be obtained by analyzing the data obtained from the monitoring system of the mine pressure monitoring system in the working face of this mine.

Table 5 The ratio of maximum working resistance to rated working resistance

(4) Divide the working face into 3 sections, and each section is manually discharged by two on-site personnel, and record the coal discharge time, the number of swings of the tail beam, and the number of extensions and retractions of the inserting plate, and calculate the recorded results of the two persons. Average value, as shown in Table 6 below;

Table 6 The ratio of maximum working resistance to rated working resistance

(5) Determine the membership degree value and assign weights for the values determined in steps (1)~step (4), and calculate the comprehensive score through the membership degree matrix method, and finally determine the risk of top-coal leakage, as shown in Table 7 below .

Table 7 Classification of top-coal caving properties

Step 2. Determine the coal discharge method of the working face according to the top-coal caving performance, mainly including the number of coal discharge rounds and the number of coal discharge intervals.

Step 3. Establish the coal discharge opening mode of the hydraulic support that matches the coal discharge mode of the working face, and finally execute the coal discharge operation. The coal discharge port mode refers to the general term for a series of standardized procedures for when and where the coal discharge mechanism of the support performs what kind of coal discharge action, as shown in Table 8 below.

Table 8 Determination of coal discharge mode and coal discharge port mode

Step 4. Real-time monitor the output current of the scraper machine motor and the amount of gas gushing out. There are two threshold values for the scraper machine, which are the full-load warning value 1 and the overload warning value 2. When the set full-load warning value 1 is exceeded At this time, reduce the coal discharge port of the hydraulic support. When exceeding the set overload warning value 2, close the coal discharge port of the hydraulic support.

The technical solution of the present invention is not limited to the limitations of the above-mentioned specific embodiments, and any technical deformation made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims (6)

1. a kind of hydraulic support of top-coal saving face puts coal method, it is characterised in that：The hydraulic support is using electric hydraulic control system Hydraulic support, the coal method of putting comprises the following steps：

Step 1, to working face Top coal caving characteristic carry out Real-Time Evaluation；

Step 2, accounting drag conveyor bearing capacity are simultaneously combined determination working face caving mode with step 1；

The hydraulic support coal discharge outlet pattern that step 3, foundation match with working face caving mode, final perform puts coal operation；

The output current and gas emission of step 4, in real time monitoring scrapper conveyor motor, when more than set threshold value, subtract Small or closing hydraulic support coal discharge outlet.

2. a kind of hydraulic support of top-coal saving face according to claim 1 puts coal method, it is characterised in that：The step 1 Including below scheme：

1）, determine the top coal thickness and dirt band number of plies and intensity；

2）, determine working surface hydraulic support safety valve unlatching rate；

3）, determine that working surface hydraulic support maximum operation resistance accounts for the percentage of the hydraulic support quantity of yield load 80%；

4）, working face is divided into 3 ~ 5 sections, every section by being carried out putting coal manually by two Field Force, and record top coal caving time, Tail boom number of oscillations, plate stretch receipts number of times, and the record result of two people is averaged；

5）, to 1）~4）The numerical value that is gathered determines to be subordinate to angle value and distributes weight, and obtained by subordinated-degree matrix method comprehensive Point, finally determine Top coal caving characteristic.

3. a kind of hydraulic support of top-coal saving face according to claim 1 puts coal method, it is characterised in that：The step 2 Described caving mode includes putting coal freighter number and puts coal space-number.

4. a kind of hydraulic support of top-coal saving face according to claim 1 puts coal method, it is characterised in that：The hydraulic pressure branch Frame coal discharge outlet pattern for hydraulic support Fang Mei mechanisms when, where perform which kind of put coal action series of standards program General name.

5. a kind of hydraulic support of top-coal saving face according to claim 1 or 4 puts coal method, it is characterised in that：It is described to put Coal mouth mold formula is divided into three kinds, is respectively first mode playback F1, normal back production model F 2, ending model F 3；Three kinds of coal discharge outlet patterns point Drawing sequence that Wei be not different, put coal mechanism status and angle；

First mode playback F1, normal back production model F 2, the drawing sequence for the model F 3 that finishes up, put coal mechanism status and angle is shown in Table 1, table 2 and table 3：

Table 1, first mode playback F1

Table 2, normal back production model F 2

Table 3, ending model F 3

。

6. hydraulic support of top-coal saving face according to claim 1 puts coal method, it is characterised in that：Scraped in the step 4 Trigger threshold values is two, is respectively fully loaded with early warning value and overload early warning value.