CN115095326A - Method for determining height of dragline standing platform in throwing blasting-dragline reverse piling process - Google Patents

Abstract

The invention provides a method for determining the height of a dragline standing platform in a throwing blasting-dragline reverse piling process, which comprises the following steps: step S10: based on the historical data of the shape of the blasting pile of the throwing blasting, a regression equation f (H) of the height of the blasting step of the throwing blasting and the effective throwing rate is established _Throwing ) (ii) a Step S20: based on the historical data of the throwing blasting pile form, a regression equation k (H) of the ratio of the falling pile workload of the dragline in the total stripping workload and the height of a standing platform of the dragline is established _Station ) (ii) a Establishing a regression equation g (H) of the proportion of the secondary reverse pile amount of the dragline in the total reverse pile operation amount and the height of a standing platform of the dragline _Station ) (ii) a Step S30: and (3) determining the height of a standing platform of the dragline which gives full play to the production capacity of the dragline and ensures the continuous and stable production of raw coal according to the formula (1). The invention solves the problems of the prior artThe problem of low operating efficiency of the dragline is caused by unreasonable design of the height of a dragline standing platform in the throwing blasting-dragline reverse piling process in the operation.

Description

Throwing blasting - dragline dumping process method for determining the height of the standing platform of the dragline

technical field

The invention relates to the field of coal open-pit mining, in particular to a method for determining the height of a standing platform of a dragline shovel in a throwing blasting-drawback dumping process.

Background technique

The dragline dumping process is a combined stripping process that integrates mining, transportation and disposal. In this process, a large dragline is used as the dumping stripping equipment, and the stripped material located in the stope of the open-pit coal mine is directly excavated and discharged to the inner dump. The dragline dumping process is usually combined with the throwing blasting technology. Through throwing blasting, about 30% of the exfoliated objects in the dumping step are thrown directly into the goaf of the inner dump, thereby greatly improving the stripping production efficiency and reducing production costs. .

In my country's open-pit coal mines using the throwing blasting-drag shovel dumping process, first throwing blasting is carried out on the dumping stripping step, and then the single bucket-truck technology is used to carry out the necessary leveling of the blasting pile with the cooperation of the bulldozer, and finally the dragline shovel Carry out the stacking stripping operation on the leveled standing platform.

The unreasonable design of the working face parameters of the dragline dumping operation will increase the amount of auxiliary works, reduce the work efficiency and production capacity of the dragline, and increase the stripping cost. In the working face parameters of dragline dumping operation, the height of dragline standing platform directly affects the width of dragline standing platform, the cycle time of dragline dumping operation, the secondary dumping amount of dragline, bulldozer or single bucket excavation The amount of machine-assisted stripping, which in turn affects the production cost and raw coal production capacity of the open pit mine, is one of the more important parameters. Therefore, according to the shape of the throwing blasting blasting pile, the specification parameters of the dragline shovel, and the raw coal production capacity of the opencast coal mine, the reasonable standing platform height of the dragline shovel is determined, and the raw coal production is realized for the opencast mine using the throwing blasting-drawing shovel dumping process. It is of great significance to maintain stability, give full play to the production capacity of draglines, and reduce mining costs.

That is to say, in the prior art, the throwing blasting and dragline dumping process has the problem of low operation efficiency of the dragline due to the unreasonable height design of the standing platform of the dragline.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a method for determining the height of the standing platform of the dragline shovel in the process of throwing and blasting - dragline dumping, so as to solve the problem of the throwing blasting - dragline dumping process in the prior art due to the design of the height of the standing platform of the dragline shovel. Unreasonable and lead to the problem of low efficiency of dragline operations.

In order to achieve the above object, according to one aspect of the present invention, there is provided a method for determining the height of a standing platform of a dragline shovel in a throwing blasting-drawback dump process, comprising: Step S10: Based on the historical data of the throwing blasting blasting pile shape, establish a throwing blasting process Regression equation f(H _throw ) of blasting step height and effective throwing rate; Step S20: Based on the historical data of blasting pile shape of throwing blasting, establish the proportion of dragline dumping operation in the total stripping operation and dragline standing The regression equation k of the platform height (H _station ); establish the regression equation g (H station) of the proportion of the secondary dumping amount of the dragline in the total dumping operation and the standing platform height of the dragline (H _station ); Step S30: According to Formula (1) determines the standing platform height of the dragline shovel under the condition that the production capacity of the dragline shovel can be fully utilized and the production of raw coal can be ensured continuously and stably.

Among them, H _{throw is} the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m _; is the annual dumping operation volume of the dragline in the throwing blasting-dragline dumping system, the unit is m ³ ; H _coal is the average thickness of the raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the The bulk density of raw coal, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, the unit is _Mt /a; l is the length of the stacking working line, the unit is m.

Further, step S10 includes: collecting and arranging morphological data of the throwing blasting stack; statistically analyzing the effective throwing rates under different throwing and blasting step height conditions; The regression equation f(H- _throwing ) between the height of the throwing blasting step and the effective throwing rate.

Further, step S20 includes: collecting and arranging the shape history data of the throwing blasting and blasting pile; drawing the operation cross-sectional area profile of each link of the throwing blasting-drawing bucket dumping pile system under the conditions of different throwing blasting step heights and different dragline standing platform heights Figure: Statistical analysis of the cross-sectional area of each link operation in the throwing blasting-drawback dumping system under the conditions of different throwing and blasting step heights and different dragline standing platform heights; Throwing blasting at the height - the cross-sectional area of each link in the dragline dumping system, establish the regression equation k(H _Station ); establish the regression equation g (H _station ) of the proportion of the secondary dumping amount of the dragline in the total dumping operation and the height of the standing platform of the dragline.

Further, between steps S20 and S30, it also includes: according to formula (2) and the regression equation k ( _station H) of the proportion of the dragline dumping operation in the total stripping operation and the height of the dragline standing platform Determine the cross-sectional area S _pull of the dragline shovel dumping operation,

S=S ₁ +S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·[1+g(H _station )] Formula (2);

S _pull =S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·(1+g(H _station ))·k(H _station ) Formula (3);

Equation (1) is obtained from Equation (3) and Equation (4),

Among them, S is the operating sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₁ is the single bucket-truck process auxiliary operation sectional area, the unit is m ² ; S ₂ is the drag bucket dumping operation once The cross-sectional area of the dumping pile, the unit is m ² ; S ₃ is the cross-sectional area of the second dumping dumping operation of the dragline, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the throwing blasting step mining zone Width, the unit is m; λ is the throwing blasting loosening coefficient; H is the _standing platform height of the dragline, the unit is m; _Spu is the sectional area of the dragline dumping operation, the unit is _m2 ; ^M2 is the throwing blasting- In the dragline dumping system, the annual amount of dragline dumping, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the raw coal bulk density, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, and the unit is _Mt /a; l is the length of the stacking working line, and the unit is m.

Further, in the process of obtaining formula (1) from formula (3) and formula (4), it also includes: establishing a functional relationship between the annual operation volume of the stacking system and the annual production capacity of raw coal according to the annual advancement degree T' of the working line,

According to the formula (5), the functional relationship between the annual dragline dumping operation volume and the dragline dumping cross-sectional area S _pull in the throwing blasting- dragline dumping system is established,

Among them, M _is the annual operation volume of the dumping system, the unit is m ³ ; S is the operation cross-sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₂ is the dumping interception of one dragging operation. Area, the unit is m ² ; S ₃ is the cross-sectional area of the secondary dumping of the drag bucket dumping operation, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m; λ is the loosening coefficient of throwing blasting; M ₂ is the annual amount of dragline dumping operation in throwing blasting-drawback dumping system, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the bulk density of the raw coal, the unit is t/m ³ ; M is the annual production capacity of the raw _coal , the unit is Mt/a; _l is the stacking working line length, the unit is m; T ' is the annual advancement of the working line, in m/a.

Further, in step S10, a quadratic regression equation f(H _throw ) is established.

Further, in step S20, a quadratic regression equation k(H _station ) is established.

Further, in step S20, a quadratic regression equation g(H _station ) is established.

Applying the technical solution of the present invention, the method for determining the height of the standing platform of the dragline shovel in the throwing blasting-drawback dumping process includes: Step S10: Based on the historical data of the throwing blasting blast pile shape, establish a regression equation between the throwing blasting step height and the effective throwing rate f(H _throwing ); Step S20: Based on the historical data of the blasting pile shape of throwing blasting, establish a regression equation k (H _station ) of the proportion of the dragline dumping operation amount in the total stripping operation and the dragline standing platform height ; Establish the regression equation g (H _station ) of the proportion of the secondary dumping amount of the dragline in the total dumping operation and the height of the dragline standing platform; Step S30: Determine according to formula (1) to give full play to the dragline production capacity, the height of the standing platform of the dragline shovel to ensure the continuous and stable production of raw coal,

Among them, H is the height of the _throwing blasting step, the unit is m; b is the width of the mining belt of the throwing blasting step, the unit is m; λ is the throwing blasting loosening coefficient _; Annual dumping operation volume, m ³ ; H _coal is the average thickness of raw coal, in m; l _coal is the length of the raw coal working line, in m; γ is the bulk density of raw coal, in t/m ³ ; M _coal is the annual production of raw coal Capacity, the unit is _Mt /a; l is the length of the stacking working line, the unit is m.

Through step S10, analyzing the historical data of the blasting pile shape of the throwing blasting, the shape of the blasting pile curve formed after the throwing blasting of the stripping step can be determined, and the effective throwing rate under different throwing blasting step heights can be counted, which is convenient to clarify the difference between the throwing blasting step height and the effective throwing rate. The relationship between the throwing blasting step height and the effective throwing rate f(H _throwing ) is established to predict the effective throwing rate under different throwing blasting step heights.

It should be noted that after the stripping step is thrown and blasted, a part of the exfoliated material is directly thrown into the dumping area of the inner dumping yard, which is called the effective throwing amount and does not need to be Pull bucket to dump the pile for stripping. The ratio of the effective throwing volume to the total throwing blasting volume is the effective throwing rate. When the geological conditions of the throwing blasting area and throwing blasting parameters have not changed greatly, the effective throwing rate of throwing blasting steps is mainly affected by the height of throwing blasting steps.

Through step S20, analyzing the historical data of the shape of the throwing blasting blasting pile, it is possible to clarify the relationship between the height of the standing platform of the dragline shovel on the stacking operation volume of the dragline shovel, the secondary stacking volume of the dragline shovel, the total amount of stripping operations, and the total amount of stacking operations. Influence, establish the regression equation k ( _station H) of the proportion of the dragline dumping operation in the total stripping operation and the height of the dragline standing platform, and the secondary dumping amount of the dragline in the total dumping operation Regression equation g(H _station ) of the proportion of in and the height of the standing platform of the dragline shovel. The total amount and the total amount of dumping operations are forecasted.

It should be noted that the effective throwing volume after the throwing blasting of the stripping step does not need to be stripped by the drag bucket. After the pile is leveled, a standing platform for dragline dumping operation is formed. The outer extension part of the standing platform is constructed by the layered exfoliation on the blasting heap. In the field, the peeling amount of this part is the secondary dumping amount of the dragline shovel.

Through step S30, the standing platform height of the dragline is determined by formula (1), so as to give full play to the production capacity of the dragline, ensure the continuous production of raw coal, reduce the stripping cost of the throwing blasting-drawback dumping process system, and improve the mining efficiency.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Figure 1 shows a schematic diagram of coal mining and dragline dumping operations according to an optional embodiment of the present invention;

FIG. 2 shows a schematic cross-sectional schematic diagram of the effective throwing amount of the throwing blasting-draw bucket dumping process system in FIG. 1;

Fig. 3 shows a cross-sectional view of the operation area of each link of the throwing blasting-draw bucket dumping system in Fig. 1;

Figure 4 shows a schematic diagram of the layout of the integrated mining process system in Figure 1;

Fig. 5 shows the sectional view of the blasting stack when the height of the throwing blasting step in Fig. 1 is 35m;

Fig. 6 shows the sectional view of the blasting stack when the height of the throwing blasting step in Fig. 1 is 40m;

Fig. 7 shows the sectional view of the blasting stack when the height of the throwing blasting step in Fig. 1 is 45m;

Fig. 8 shows the sectional view of the blasting stack when the height of the throwing blasting step in Fig. 1 is 50m;

Fig. 9 shows the relationship between the throwing blasting step height and the effective throwing rate in Fig. 1;

Fig. 10 shows the sectional view of the workload of each link in the throwing blasting-draw bucket dumping process system in Fig. 1;

Figure 11 shows the proportion of the work volume of each part of the dumping system when the height of the throwing blasting step in Figure 1 is 40m;

Fig. 12 shows the proportion of the workload of each part in the dumping system when the height of the throwing blasting step in Fig. 1 is 45m;

Figure 13 shows the proportion of the work volume of each part in the dumping system when the height of the throwing blasting step in Figure 1 is 50m;

FIG. 14 is a flow chart showing the method for determining the height of the standing platform of the dragline bucket in the throwing blasting-drawback dumping process in FIG. 1 .

Wherein, the above-mentioned drawings include the following reference signs:

1. Mound dump; 2. Dragline; 3. Standing platform of dragline; 4. Coal seam roof; 5. Electric shovel; 6. Throwing blasting pile; 7. Coal transport channel; 9. The truck discards the rock; 10. The loess layer; 11. The upper rock layer; 12. The lower rock layer; 13. The coal seam.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless otherwise stated, the directional words used such as "upper, lower, top, bottom" are usually for the directions shown in the drawings, or for the components themselves in vertical, In terms of vertical or gravitational direction; similarly, for the convenience of understanding and description, "inner and outer" refers to the inner and outer relative to the contour of each component itself, but the above-mentioned orientation words are not used to limit the present invention.

In order to solve the problem of low dragline operation efficiency caused by the unreasonable height design of the standing platform of the dragline shovel in the prior art throwing blasting - dragline dumping process, the present invention provides a throwing blasting - dragline dumping stacking A method for determining the height of a standing platform of a craft dragline.

As shown in Fig. 1 to Fig. 14, the method for determining the height of the standing platform of the dragline shovel in the throwing blasting-drawback dumping process includes: Step S10: Based on the historical data of the throwing blasting pile 6 shape, establish the throwing blasting step height and the effective throwing rate The regression equation f(H _throw ); Step S20: Based on the historical data of the shape of the throwing blasting pile 6, establish the regression equation k of the proportion of the dragline dumping operation amount in the total stripping operation and the dragline standing platform height (H _station ); establish a regression equation g (H _station ) of the proportion of the secondary dumping amount of the dragline in the total dumping operation and the height of the dragline standing platform; Step S30: Determine the sufficient amount according to formula (1). To give full play to the production capacity of the dragline shovel and to ensure the standing platform height of the dragline shovel under the condition of continuous and stable raw coal production,

Among them, H _{throw is} the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m _; is the annual dumping operation volume of the dragline in the throwing blasting-dragline dumping system, the unit is m ³ ; H _coal is the average thickness of the raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the The bulk density of raw coal, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, the unit is _Mt /a; l is the length of the stacking working line, the unit is m.

Through step S10, analyzing the shape history data of the throwing blasting detonation pile 6, the curve shape of the throwing blasting blasting pile 6 formed after the throwing and blasting of the stripping step can be determined, and the effective throwing rate under different throwing blasting step heights can be counted, so as to facilitate the identification of the throwing blasting blasting step. The relationship between the height and the effective throwing rate was established, and the regression equation f(H _throwing ) of the throwing blasting step height and the effective throwing rate was established, so as to predict the effective throwing rate under different throwing blasting step heights.

It should be noted that, as shown in Figure 2, after the stripping step is thrown and blasted, a part of the exfoliated material is directly thrown into the dump 1 range discarded by the drag shovel in the inner dump field. This part is called effective. Throwing amount, no need to dump the pile with a dragline (shown as the shaded part in Figure 2). The ratio of the effective throwing volume to the total throwing blasting volume is the effective throwing rate. When the geological conditions of the throwing blasting area and throwing blasting parameters have not changed greatly, the effective throwing rate of throwing blasting steps is mainly affected by the height of throwing blasting steps.

Through step S20, analyzing the shape history data of the throwing blasting detonation pile 6, it can be clear that the height of the standing platform of the dragline shovel affects the amount of the dragline dumping operation, the secondary dumping amount of the dragline, the total amount of stripping operations, and the total amount of dumping operations. To determine the influence of the dragline shovel, the regression equation k(H _station ) of the proportion of the dragline dumping operation in the total stripping operation and the height of the dragline standing platform was established, and the secondary dumping amount of the dragline in the dumping operation was established. The regression equation g(H _station ) of the proportion of the total and the height of the dragline standing platform The total number of jobs and the total number of dumping jobs are forecasted.

It should be noted that the effective throwing amount after the throwing blasting of the stripping step does not need to be stripped by a drag shovel. The upper layer of the throwing blasting blasting pile 6 is leveled by a single bucket-truck process with the assistance of a bulldozer, and the throwing blasting is carried out. After the blast pile 6 is leveled, a standing platform for dragging and dumping is formed. The outer extension part of the standing platform is constructed by the layered exfoliation on the blasting blast pile 6. This part of the exfoliation needs to be dumped by the drag shovel for a second time. Discharge to the inner dump, and this part of the stripping amount is the secondary dumping amount of the dragline shovel.

Through step S30, the standing platform height of the dragline is determined by formula (1), so as to give full play to the production capacity of the dragline, ensure the continuous production of raw coal, reduce the stripping cost of the throwing blasting-drawback dumping process system, and improve the mining efficiency.

Specifically, step S10 includes: collecting and arranging the morphological data of the throwing blasting stack 6; statistically analyzing the effective throwing rates under different throwing and blasting step height conditions; through regression analysis of the effective throwing rates under different throwing blasting step height conditions, The regression equation f(H- _throwing ) of the throwing blasting step height and the effective throwing rate is established. In the process of collecting and arranging the morphological data of the throwing and blasting detonation piles 6, it is possible to select some shapes of the throwing and blasting blasting piles 6 that are closest to the actual conditions of coal mining, and conduct a statistical analysis of the effective throwing rates under the conditions of different throwing and blasting step heights. Then, the regression analysis of the effective throwing rate is carried out, and the effective throwing rate under different throwing blasting step heights is predicted by the regression equation f(H _throwing ).

As shown in FIG. 3 , step S20 includes: collecting and sorting out the shape history data of the throwing and blasting blasting pile 6; Sectional diagram of operation cross-sectional area; statistical analysis of the cross-sectional area of each link operation in the throwing blasting-drawback dumping system under the conditions of different throwing blasting step heights and different dragline standing platform heights; according to different throwing blasting step heights, different pulling Throwing blasting at the height of the bucket bucket standing platform - the cross-sectional area of each link operation in the dragline dumping system, and establishing the proportion of the dragline dumping operation volume in the total stripping operation and the return of the dragline bucket standing platform height Equation k ( _station H); establish the regression equation g ( _station H) of the proportion of the secondary dumping amount of the dragline in the total dumping operation and the height of the standing platform of the dragline.

In the process of collecting and arranging the shape data of the throwing blasting pile 6, the shape of the throwing blasting pile 6 can be selected according to the actual situation of coal mining. Under the conditions, the cross-sectional area sectional view of each link of the throwing blasting-draw bucket dumping system can be obtained. , The cross-sectional area of the one-time dumping operation of the dragline shovel, the second dumping operation of the dragline shovel, no dumping operation outside the standing platform 3 of the dragline shovel, and the sectional area of the effective throwing amount of throwing blasting, which is convenient for analyzing the amount of dumping operation of the dragline shovel. The proportion of the total stripping operation and the proportion of the secondary dumping of the dragline in the total dumping operation.

It should be noted that, when drawing the cross-sectional area sectional diagram of each link of the throwing blasting-draw bucket dumping system, it is necessary to scan the historical shape diagram of the throwing blasting blasting pile 6 first, and then draw the sectional area sectional view of each link operation according to the scanned image. .

Under the condition of the height of the throwing blasting step, selecting different platform heights of the dragline shovel, repeating the above process, and analyzing the data statistically, the proportion of the dragline dumping operation in the total stripping operation can be established and the dragline standing The regression equation k ( _station H) of the platform height and the proportion of the secondary dumping amount of the dragline in the total dumping operation and the regression equation g ( _station H) of the standing platform height of the dragline shovel, so that the different pull The dragline dumping volume, the second dragline dumping volume and the total dumping volume are predicted at the height of the bucket bucket standing platform.

Change the height of the throwing blasting step and repeat the above process to achieve statistical analysis of different throwing blasting step heights and different dragline standing platform heights.

It should be noted that the height of the throwing blasting step and the height of the standing platform of the dragline are not randomly selected, but the range is determined according to the historical data of the actual open-pit coal mining situation to ensure that the content of the analysis does not deviate from the actual production needs.

It should be noted that the cross-sectional area S ₁ of the auxiliary operation of the single bucket-truck process, the cross-sectional area S ₃ of the secondary dumping operation of the dragline dumping operation, the cross-sectional area S ₄ of the outside of the standing platform 3 of the dragline shovel that does not require dumping operation, The following relationship is satisfied between:

S ₁ = _ky ·(S ₃ +S ₄ ) formula (6);

Among them, _ky is the compaction coefficient of the throwing blasting stack 6 after leveling.

It should be noted that the effective throwing amount cross-sectional area S5 of throwing blasting can be limited by formula ( ₇ ),

S ₅ =H _throw ·b·λ·f(H _throw ) Formula (7).

Specifically, between steps S20 and S30, it also includes: according to formula (2) and the regression equation k ( _station H) of the proportion of the dragline dumping operation in the total stripping operation and the height of the dragline standing platform Determine the cross-sectional area S _{of the} dragline dumping operation;

S=S ₁ +S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·[1+g(H _station )] Formula (2);

S _pull =S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·(1+g(H _station ))·k(H _station ) Formula (3);

Equation (1) is obtained from Equation (3) and Equation (4),

Among them, S is the operating sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₁ is the single bucket-truck process auxiliary operation sectional area, the unit is m ² ; S ₂ is the drag bucket dumping operation once The cross-sectional area of the dumping pile, the unit is m ² ; S ₃ is the cross-sectional area of the second dumping dumping operation of the dragline, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the throwing blasting step mining zone Width, the unit is m; λ is the throwing blasting loosening coefficient; H is the _standing platform height of the dragline, the unit is m; _Spu is the sectional area of the dragline dumping operation, the unit is _m2 ; ^M2 is the throwing blasting- In the dragline dumping system, the annual amount of dragline dumping, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the raw coal bulk density, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, and the unit is _Mt /a; l is the length of the stacking working line, and the unit is m.

Through the regression equation k(H _station ) of the proportion of the dragline dumping operation volume in the total stripping operation and the height of the dragline standing platform and the operating cross-sectional area of the throwing blasting-drawbine dumping system, the dragline can be obtained. The cross-sectional area S _of shoveling and dumping; and the annual amount of dragline dumping in the throwing blasting-draw bucket dumping system can be obtained from formula (4), that is, the pulling bucket in the throwing blasting-drawing bucket dumping system The annual amount of dumping work can be obtained from the cross-sectional area of the dragline dumping operation.

Specifically, the process of obtaining formula (1) from formula (3) and formula (4) also includes: establishing a functional relationship between the annual operation volume of the stacking system and the annual production capacity of raw coal according to the annual advancement degree T' of the working line,

According to the formula (5), the functional relationship between the annual dragline dumping operation volume and the dragline dumping cross-sectional area S _pull in the throwing blasting- dragline dumping system is established,

Among them, M _is the annual operation volume of the dumping system, the unit is m ³ ; S is the operation cross-sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₂ is the dumping interception of one dragging operation. Area, the unit is m ² ; S ₃ is the cross-sectional area of the secondary dumping of the drag bucket dumping operation, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m; λ is the loosening coefficient of throwing blasting; M ₂ is the annual amount of dragline dumping operation in throwing blasting-drawback dumping system, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the bulk density of the raw coal, the unit is t/m ³ ; M is the annual production capacity of the raw _coal , the unit is Mt/a; _l is the stacking working line length, the unit is m; T ' is the annual advancement of the working line, in m/a.

As shown in FIG. 1 , in the throwing blasting-dragon shovel dumping process in an open-pit coal mine, the dragline shovel 2 and the electric shovel 5 are used to discharge the explosives in the throwing blasting blasting pile 6 to the dumping pile 1, and the output The coal is transported to the raw coal crushing station through the coal transport channel 7. Coal mining and dragline dumping working face adopts tracking mining arrangement, so the propulsion of dumping system and coal mining working line should be consistent. Therefore, formula (5) is obtained between the annual operation volume of dumping system and the annual production capacity of raw coal. Function relationship, corresponding to the cross-sectional area of the dragline dumping operation, the annual amount of the dragline dumping operation can be obtained.

It should be noted that the annual advancement degree T' of the working line can be defined by formula (8),

According to formula (5), the annual auxiliary work volume M ₁ of the single bucket-truck can also be obtained,

Specifically, in step S10, a univariate quadratic regression equation f(H _throw ) is established. The regression equation f(H _throw ) is a quadratic equation with less formal error, which can more effectively analyze the effective throwing rate under different throwing blasting step heights.

Specifically, in step S20, a quadratic regression equation k(H _station ) is established. The regression equation k(H _station ) is a one-dimensional quadratic equation, and the formal error is small, which can be more effective for the proportion of the dragline dumping work volume in the total stripping work under different dragline standing platform heights. analyze.

Specifically, in step S20, a quadratic regression equation g(H _station ) is established. The regression equation g(H _station ) is a one-dimensional quadratic equation, and the formal error is small, which can be used to calculate the proportion of the secondary dumping amount of the dragline shovel in the total dumping operation at different heights of the standing platform of the dragline shovel. effective analysis.

Taking a large open-pit coal mine as an example, the designed raw coal production capacity is 12.0Mt/a. The bottom of the mining boundary has an average strike of 7.8km, an average dip width of 5.09km, an area of 40.25km ² and an average depth of 140m. The average thickness of the mineable coal seam 13 within the boundary is 28.8m, and the recoverable raw coal reserves are 1.4 billion tons.

As shown in Figure 4, the large open-pit coal mine adopts a comprehensive mining process. The loess layer 10 and the upper rock layer 11 are peeled off using a single bucket-truck process to form a truck dumped loess 8 and a truck dumped rock 9. The thickness of the coal seam roof 4 is about 45m. The lower rock layer 12 of the coal seam is stripped using the dragline dumping process, and the coal seam 13 is mined by the single bucket-truck-surface semi-fixed crushing station semi-continuous mining process. Figure 4 illustrates the constraint relationship between the throwing blasting-drag bucket dump pile stripping step and the coal mining step.

In this embodiment, the process of determining the height of the dragline standing platform is as follows:

1) Establish a regression equation between the throwing blasting step height and the effective throwing rate. As shown in Fig. 5 to Fig. 8, the typical cross-sectional view of the throwing blasting blasting pile 6 of the large open-pit coal mine is selected, and the effective throwing rate under different throwing blasting step heights is counted. Based on the typical profile data of the throwing blasting detonation pile 6, the regression function relationship between the effective throwing rate and the throwing blasting step height is established as shown in Figure 9, and the formula (10) is obtained,

2) Draw a cross-sectional view of the workload of each link of the throwing blasting-draw bucket dumping system. Referring to the typical throwing blasting stack 6 curve when the throwing blasting step height is 45m, draw the working volume profile of each link in the throwing blasting-draw bucket dumping process system when the throwing blasting step height is 45m and the dragline standing horizontal height is 18m Figure, as shown in Figure 10. According to the principle of equal area, the relationship between the cross-sectional areas of S1, S3, and S4 in the figure is:

S ₁ = _ky ·(S ₃ +S ₄ ) formula (6);

In the formula, _ky is the compaction coefficient, which is taken as 0.8.

Referring to Figure 10, when the height of the throwing blasting step is 40m, 45m and 50m, and the height of the standing platform of the dragline bucket is 11m to 18m, the sectional views of the work volume of each link in the throwing blasting-drawbine dumping process system are drawn.

3) Analysis of the height of the standing platform of the dragline bucket and the operation cross-sectional area. Based on the drawn profile diagram of the work volume of each link at different standing platform heights of the dragline, it is possible to directly measure the cross-sectional area corresponding to the working part of each link from the figure, and count the work section of each link under the condition of different standing platform heights of the dragline. area, as shown in Tables 1 to 3.

Under the condition of throwing blasting step height of 40m, the loosening coefficient is 1.36, the effective throwing rate is 0.365, and the compaction rate is 0.8. Table 1 shows the cross-sectional area of dragline operation, the cross-sectional area of secondary dumping operation and the cross-sectional area of single bucket-truck operation under different standing levels of the dragline.

Dragline standing horizontal height (m) Cross-sectional area of dragline operation (m²) Cross-sectional area of secondary dumping operation (m²) Cross-sectional area of single bucket-truck operation (m²) 11 2235 610 1302 12 2346 630 1211 13 2449 643 1120 14 2527 633 1035 15 2599 617 949 16 2659 592 864 17 2708 558 782 18 2746 515 701

Table 1

Under the condition of throwing blasting step height of 45m, the loosening coefficient is 1.45, the effective throwing rate is 0.378, and the compaction rate is 0.8. Table 2 shows the cross-sectional area of the dragline shovel, the cross-sectional area of the secondary dumping operation, and the single-bucket-truck operating cross-sectional area at different standing levels of the dragline shovel.

Dragline standing horizontal height (m) Cross-sectional area of dragline operation (m²) Cross-sectional area of secondary dumping operation (m²) Cross-sectional area of single bucket-truck operation (m²) 11 2258 651 1843 12 2399 708 1759 13 2553 778 1675 14 2708 851 1593 15 2864 926 1512 16 2906 888 1432 17 3001 903 1352 18 3061 885 1274

Table 2

Under the condition of throwing blasting step height of 50m, the loosening coefficient is 1.52, the effective throwing rate is 0.39, and the compaction rate is 0.8. Table 3 shows the cross-sectional area of the dragline shovel, the cross-sectional area of the secondary dumping operation, and the single-bucket-truck operating cross-sectional area at different standing levels of the dragline shovel.

Dragline standing horizontal height (m) Cross-sectional area of dragline operation (m²) Cross-sectional area of secondary dumping operation (m²) Cross-sectional area of single bucket-truck operation (m²) 11 2248 321 2013 12 2399 367 1907 13 2552 416 1803 14 2707 467 1699 15 2864 522 1598 16 3023 581 1498 17 3183 642 1399 18 3345 707 1302

table 3

4) Establish a regression function between the workload of each link of the throwing blasting-drawback dumping system and the height of the dragline standing platform. Based on the data in Tables 1 to 3, the relationship between the proportion of the work volume of each link of the throwing blasting-drawback dumping system in the total dumping operation and the height of the dragline standing platform is established, as shown in Figures 11 and 11. 13 shown.

Under the conditions of different throwing and blasting step heights, the regression function between the proportion of the dragline dumping amount and the secondary dumping amount in the total dumping operation and the height of the dragline standing platform is as follows.

When the height of the throwing blasting step is 40m, the proportion of the dragline dumping operation in the total stripping operation is related to the regression function of the height of the dragline standing platform:

The relationship between the proportion of the secondary dumping amount of the dragline in the total dumping operation and the regression function of the height of the standing platform of the dragline is:

When the height of the throwing blasting step is 45m, the proportion of the dragline dumping operation in the total stripping operation is related to the regression function of the height of the dragline standing platform:

The relationship between the proportion of the secondary dumping amount of the dragline in the total dumping operation and the regression function of the height of the standing platform of the dragline is:

When the height of the throwing blasting step is 50m, the proportion of the dragline dumping operation in the total stripping operation is related to the regression function of the height of the dragline standing platform:

The relationship between the proportion of the secondary dumping amount of the dragline in the total dumping operation and the regression function of the height of the standing platform of the dragline is:

5) Determine the height of the standing platform of the dragline. The large open-pit coal mine has a dragline production capacity of 16 million m ³ /a per year for dumping and stripping, a planned raw coal output of 34 million t/a, a throwing and blasting step mining belt width of 85 m, a stacking working line length of 1550 m, and a coal mining working line length of 2300 m. , the average bulk density of raw coal is 1.47t/m ³ . Based on the above parameters, formula (1) can be solved to determine the reasonable standing platform height of each mining belt, as shown in Table 4.

Table 4

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

1. Based on the historical data of the shape of the throwing blasting stack 6, establish the proportion of the throwing blasting step height and the effective throwing rate, the standing platform height of the dragline bucket and the secondary dumping volume of the dragline bucket in the total dumping operation, and the pull The regression function relationship between the proportion of bucket dumping operations in the total stripping operation, establish a mathematical model for the height of the dragline standing platform, and determine a reasonable dragline standing platform height to give full play to the production capacity of the dragline. .

2. Under the condition of a reasonable height of the standing platform of the dragline shovel, the production capacity of the dragline shovel can be fully utilized, the stripping cost of the throwing blasting-drawback shovel dumping process system can be reduced, and the continuous and stable production of raw coal can be ensured.

Obviously, the above-described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, acts, devices, components, and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. a method for determining the height of a standing platform of a dragline shovel and a dragline shovel dumping process for throwing and blasting, is characterized in that, comprising: Step S10: based on the historical data of the shape of the throwing blasting blasting pile (6), establish a regression equation f(H _throwing ) of the throwing blasting step height and the effective throwing rate; Step S20: Based on the historical data of the shape of the throwing blasting pile (6), establish a regression equation k ( _station H) of the proportion of the dragline dumping operation amount in the total stripping operation and the height of the dragline standing platform; Establish the regression equation g(H _station ) of the proportion of the secondary dumping volume of the dragline in the total dumping operation and the height of the standing platform of the dragline; Step S30: According to formula (1), determine the height of the standing platform of the dragline shovel under the condition that the production capacity of the dragline shovel can be fully utilized and the production of raw coal can be ensured continuously and stably,

Among them, H _{throw is} the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m _; is the annual dumping operation volume of the dragline in the throwing blasting-dragline dumping system, the unit is m ³ ; H _coal is the average thickness of the raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the The bulk density of raw coal, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, the unit is _Mt /a; l is the length of the stacking working line, the unit is m. 2. The method for determining the height of a dragline shovel standing platform according to claim 1, wherein the step S10 comprises: Collect and sort out the morphological data of the throwing blasting stack (6); Statistically analyze the effective throwing rate under different conditions of the throwing blasting step height; Through the regression analysis of the effective throwing rate under different conditions of the throwing blasting step height, the regression equation f(H _throwing ) of the throwing blasting step height and the effective throwing rate is established. 3. The method for determining the height of the dragline standing platform according to claim 2, wherein the step S20 comprises: Collect and sort out the historical data of the form of the throwing blasting stack (6); Draw a sectional view of the operation cross-sectional area of each link of the throwing blasting-drawback dumping system under the conditions of different throwing blasting step heights and different dragline standing platform heights; Statistical analysis of the cross-sectional area of each link in the throwing blasting-drawback dumping system under the conditions of different throwing and blasting step heights and different dragline shovel standing platform heights; According to the different heights of the throwing and blasting steps and the cross-sectional area of each link operation in the throwing and blasting-drawback dumping system at different heights of the dragline standing platform, the amount of the dragline dumping operation is established in the above The proportion of the total peeling operation and the regression equation k (H _station ) of the standing platform height of the dragline; establish the proportion of the secondary dumping amount of the dragline in the total dumping operation Ratio of the regression equation g( _Hstand ) to the platform height of the dragline bucket. 4. The method for determining the height of the standing platform of the dragline shovel according to claim 1, characterized in that, between steps S20 and S30, the method further comprises: Formula (3) is obtained according to formula (2) and the regression equation k ( _station H) of the proportion of the dragline dumping work amount in the total stripping work and the height of the dragline standing platform. , S=S ₁ +S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·[1+g(H _station )] Formula (2); S _pull =S ₂ +S ₃ =H _throw ·b·λ·[1-f(H _throw )]·(1+g(H _station ))·k(H _station ) Formula (3); The formula (1) is obtained from the formula (3) and the formula (4),

Among them, S is the operating sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₁ is the single bucket-truck process auxiliary operation sectional area, the unit is m ² ; S ₂ is the drag bucket dumping operation once The cross-sectional area of the dumping pile, the unit is m ² ; S ₃ is the cross-sectional area of the second dumping dumping operation of the dragline, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the throwing blasting step mining zone Width, the unit is m; λ is the throwing blasting loosening coefficient; H is the _standing platform height of the dragline, the unit is m; _Spu is the sectional area of the dragline dumping operation, the unit is _m2 ; ^M2 is the throwing blasting- In the dragline dumping system, the annual amount of dragline dumping, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the raw coal bulk density, the unit is t/m ³ ; M _coal is the annual production capacity of raw coal, and the unit is _Mt /a; l is the length of the stacking working line, and the unit is m. 5 . The method for determining the height of a dragline shovel standing platform according to claim 4 , wherein, in the formula (1), the formula (3) and the formula ( 4) The obtained process also includes: According to the annual advancement T' of the working line, a functional relationship between the annual operation volume of the stacking system and the annual production capacity of raw coal is established.

According to formula (5) _, a functional relationship between the annual amount of the dragline dumping operation and the cross-sectional area S of the dragline dumping operation in the throwing and blasting-drawback dumping system is established,

Among them, M _is the annual operation volume of the dumping system, the unit is m ³ ; S is the operation cross-sectional area of the throwing blasting-draw bucket dumping system, the unit is m ² ; S ₂ is the dumping interception of one dragging operation. Area, the unit is m ² ; S ₃ is the cross-sectional area of the secondary dumping of the drag bucket dumping operation, the unit is m ² ; H _throw is the height of the throwing blasting step, the unit is m; b is the width of the excavation belt of the throwing blasting step, the unit is m; λ is the loosening coefficient of throwing blasting; M ₂ is the annual amount of dragline dumping operation in throwing blasting-drawback dumping system, the unit is m ³ ; H _coal is the average thickness of raw coal, the unit is m; l _coal is the length of the raw coal working line, the unit is m; γ is the bulk density of the raw coal, the unit is t/m ³ ; M is the annual production capacity of the raw _coal , the unit is Mt/a; _l is the stacking working line length, the unit is m; T ' is the annual advancement of the working line, in m/a. 6 . The method for determining the height of the dragline standing platform according to claim 1 , wherein in step S10 , a quadratic regression equation f (H _throw ) is established. 7 . 7 . The method for determining the height of the dragline standing platform according to claim 1 , wherein in step S20 , a quadratic regression equation k (H _station ) is established. 8 . 8 . The method for determining the height of the dragline standing platform according to claim 1 , wherein in step S20 , a quadratic regression equation g (H _station ) is established.

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