CN102877845B - Method for determining automatic coal cutting track of coal mining machine for fault zone - Google Patents

Abstract

The invention provides a method for determining an automatic coal cutting track of a coal mining machine for a fault zone, and belongs to methods for determining automatic coal cutting tracks of coal mining machines. The method comprises the following steps of: performing a computed tomography (CT) to analyze the occurrence of a fault by using basic data of slot waves of a coal seam to obtain the fault side position, the fall and the fault surface dip angle of the fault; building a rectangular plane coordinate system by using a midpoint of a section AE as an origin; determining the track of the coal mining machine by using minimal rock cutting quantity as a principle, and enabling the sum of the area of delta ABC and the area of delta EFG to be minimized; and minimizing the sum of the area of the delta ABC and the area of the delta EFG when the area of the delta ABC is equal to that of the delta EFG under the condition that the coal mining machine cuts coal at the maximum elevation gamma. The analytic expressions of the coal cutting track under the condition of the minimal rock cutting quantity can be calculated by a geometrical relationship and are respectively shown in the specification. The coal mining machine cuts coal according to the track, the rock cutting quantity of the coal mining machine is minimal, and the abrasion of cutting teeth and the content of gangues are reduced.

Description

The method of the automatic coal cutting track of a kind of definite fault zone coal-winning machine

Technical field

The present invention relates to the method for the automatic coal cutting track of a kind of definite coal-winning machine, specifically the method for the automatic coal cutting track of a kind of definite fault zone coal-winning machine.

Background technology

In process of coal mining, Chang Yin runs into the tomography of not verifying makes production technique complicated, brings difficulty to coal-winning machine automation coal cutting, increases cost of winning, even causes production accident, threatens personnel in the pit's life security.In the time of exploration tomography, surface seismic exploration has unsurmountable shortcoming, and for example radio-frequency component is decayed very soon with the increase of propagation distance, stimulating frequency is low, interbed multiple disturbs, and causes resolution ratio precision not high.Adopt the basic data of coal seam slot wave be CT analyze can accurate detection tomography occurrence.

When Coal Face Passing Through Fault, the method adopting at present has: adjust coal cutting height method, flat stacking, the end method of having caunched of blowing out.The common shortcoming of these methods be the coal cutting track of coal-winning machine through optimization, coal-winning machine cuts that rock amount is large, equipment attrition large, spoil content is high when tomography crossing.

Summary of the invention

The object of the invention is to provide one to cut rock amount minimum, can determine the method for the automatic coal cutting track of fault zone coal-winning machine.

The object of the present invention is achieved like this: concrete steps are as follows:

A, adopt the basic data of coal seam slot wave to be CT to analyze, to detect the occurrence of tomography, draw fault wall position, the drop of tomography, the numerical value at fault plane inclination angle;

B, set up plane right-angle coordinate taking the mid point of the section lap of tomography as initial point;

C, taking the tangent value of coal-winning machine maximum elevation as slope does two straight lines, form respectively two triangles;

D, taking minimal cut rock amount as principle, get the minimum value of two triangle area sums;

E, can be calculated by geometrical relationship, the analytic expression that cuts the coal cutting track of rock amount minimum is respectively: straight line is: $y=\tan \mathrm{\γ}\·x+\frac{m}{2\cos \mathrm{\γ}};$ Another straight line is: $y=\tan \mathrm{\γ}\·x-\frac{m}{2\cos \mathrm{\γ}};$

In formula: m is coal seam thickness; γ is coal-winning machine maximum elevation.

Beneficial effect, owing to having adopted such scheme, adopt the basic data of coal seam slot wave to do the occurrence of CT analysis tomography, and set up plane right-angle coordinate, taking minimal cut rock amount as principle, making two triangles is that the area sum of △ ABC and △ EFG is got minimum value, can be calculated the analytic expression of the coal cutting track that cuts rock amount minimum by geometrical relationship.Coal-winning machine carries out coal cutting according to this track, and it cuts rock amount minimum, has reduced the wearing and tearing of pick and the content of spoil; Also reduced difficulty when coal-winning machine is crossed tomography, accelerated fltting speed simultaneously.

Brief description of the drawings

Fig. 1 is fault parameter schematic diagram.

Fig. 2 is that Fig. 1 sets up plane right-angle coordinate schematic diagram.

In figure: 1, hanging wall; 2, footwall; I, fault plane one side; J, fault plane opposite side; α, seam inclination; β, fault plane inclination angle; γ, coal-winning machine maximum elevation; H, fault throw; M, coal seam thickness; O, plane right-angle coordinate initial point; B, I side coal-winning machine coal cutting track one end; D, the I side coal-winning machine coal cutting track other end; H, J side coal-winning machine coal cutting track one end; F, the J side coal-winning machine coal cutting track other end; A, hanging wall upper surface and fault plane intersection point; E, footwall soffit and fault plane intersection point.

Detailed description of the invention

Below in conjunction with accompanying drawing, enforcement of the present invention is further described:

Embodiment 1: concrete steps are as follows:

A, adopt the basic data of coal seam slot wave to be CT to analyze, to detect the occurrence of tomography, draw fault wall position, the drop of tomography, the numerical value at fault plane inclination angle;

B, set up plane right-angle coordinate taking the mid point of the section lap AE of tomography as initial point; Described A is that hanging wall upper surface and fault plane intersection point, E are footwall soffit and fault plane intersection point;

C, taking the tangent value of coal-winning machine maximum elevation as slope does two straight lines, be straight line BD and straight line HF, forming respectively two triangles is △ ABC and △ EFG; Above-mentioned B is that I side coal-winning machine coal cutting track one end, D are that the I side coal-winning machine coal cutting track other end, H are that J side coal-winning machine coal cutting track one end, F are the J side coal-winning machine coal cutting track other end; I is that fault plane one side, J are fault plane opposite side;

D, taking minimal cut rock amount as principle, get the minimum value that two triangles are the area sum of △ ABC and △ EFG;

Get the method for the minimum value of two triangle area sums: the area of establishing △ ABC and △ EFG is respectively S1 and S2.Because under different coal-winning machine tracking conditions, the value of S1 and S2 changes, therefore S1 and S2 are variablees, and the span of these two variablees is all nonnegative real number.If the area sum of two triangle △ ABC and △ EFG is S, i.e. S=S1+S2.

For function S (S1, S2)=S1+S2, its domain of definition be (S1, S2) | S1 >=0, S2 >=0, S1+S2 > 0, S1, S2 ∈ R}, codomain is { Y|Y > 0, Y ∈ R}.For the area sum S of two triangle △ ABC and △ EFG, in the time that the value of S1, S2 changes, the value of S also changes.Therefore, function S (S1, S2),, there is a minimum value s in the area sum of two triangle △ ABC and △ EFG in the value that can get, and this minimum value s is exactly the minimum value of getting two triangle area sums.

E, can be calculated by geometrical relationship, the analytic expression that cuts the coal cutting track of rock amount minimum is respectively: straight line BD: $y=\tan \mathrm{\γ}\·x+\frac{m}{2\cos \mathrm{\γ}};$ Another straight line HF: $y=\tan \mathrm{\γ}\·x-\frac{m}{2\cos \mathrm{\γ}};$

In formula: m is coal seam thickness; γ is coal-winning machine maximum elevation.

(1), in Fig. 1, adopt the basic data of coal seam slot wave to do the occurrence of CT analysis tomography, the fault wall position, drop, the fault plane inclination angle that draw tomography;

(2), in Fig. 2, set up plane right-angle coordinate taking the mid point of section AE as initial point;

Determine the track of coal-winning machine taking minimal cut rock amount as principle, make the area sum of △ ABC and △ EFG in Fig. 2 get minimum value.In the time that coal-winning machine carries out coal cutting with maximum elevation γ, it is little while carrying out coal cutting than coal-winning machine with other elevations angle that it cuts rock amount.Further, carry out under the condition of coal cutting at coal-winning machine with maximum elevation γ, in the time that △ ABC equates with the area of △ EFG, the area sum of △ ABC and △ EFG obtains minimum value.Can be calculated by geometrical relationship, the analytic expression that cuts the coal cutting track of rock amount minimum is respectively: straight line BD: $y=\tan \mathrm{\γ}\·x+\frac{m}{2\cos \mathrm{\γ}};$ Straight line F H: $y=\tan \mathrm{\γ}\·x-\frac{m}{2\cos \mathrm{\γ}};$

Claims (1)

1. a method for the automatic coal cutting track of definite fault zone coal-winning machine, is characterized in that: concrete grammar step is:

A, adopt the basic data of coal seam slot wave to be CT to analyze, to detect the occurrence of tomography, draw fault wall position, the drop of tomography, the numerical value at fault plane inclination angle;

B, set up plane right-angle coordinate taking the mid point of the section lap of tomography as initial point;

C, taking the tangent value of coal-winning machine maximum elevation as slope does two straight lines, form respectively two triangles;

D, taking minimal cut rock amount as principle, get the minimum value of two leg-of-mutton area sums;

E, can be calculated by geometrical relationship, the analytic expression that cuts the coal cutting track of rock amount minimum is respectively: straight line is: $y=\tan \mathrm{\γ}\·x+\frac{m}{2\cos \mathrm{\γ}};$ Another straight line is: $y=\tan \mathrm{\γ}\·x-\frac{m}{2\cos \mathrm{\γ}};$

In formula: m is coal seam thickness; γ is coal-winning machine maximum elevation.