Method for Determining Height of Standing Platform of Dragline in Blasting Throwing-Dragline Overturning and Piling Technology

Abstract

The present invention provides a method for determining the height of the standing platform of a dragline in the throw blasting - dragline backhoe stacking process, including: Step S10: Based on the historical data of the throw blasting muck pile shape, establish a regression equation f(H 抛 ) between the throw blasting bench height and the effective throw rate; Step S20: Based on the historical data of the throw blasting muck pile shape, establish a regression equation k(H 站 ) between the proportion of the dragline backhoe stacking operation volume in the total stripping operation volume and the height of the dragline standing platform; establish a regression equation g(H 站 ) between the proportion of the dragline secondary backhoe stacking volume in the total backhoe stacking operation volume and the height of the dragline standing platform; Step S30: Determine the height of the dragline standing platform when the production capacity of the dragline is fully exerted and the raw coal production is ensured to be continuous and stable according to formula (1). The present invention solves the problem in the prior art that the operation efficiency of the dragline is low due to the unreasonable design of the height of the dragline standing platform in the throw blasting - dragline backhoe stacking process.

Description

Technical Field

[0001] The present invention relates to the field of opencast coal mining, and more particularly, to a method for determining the height of the standing platform of a dragline in the throw blasting - dragline backhoe stacking process. Background Art

[0002] The dragline backhoe stacking process is a combined stripping process that integrates excavation, transportation, and waste disposal. In this process, a large dragline is used as the backhoe stripping equipment to directly excavate and backfill the stripping materials in the open - pit coal mine stope to the internal waste dump. The dragline backhoe stacking process is usually combined with the throw blasting technology. Through throw blasting, about 30% of the stripping materials on the backhoe stripping bench are directly thrown into the mined - out area of the internal waste dump, thus significantly improving the stripping production efficiency and reducing the production cost.

[0003] In the open - pit coal mines in China that adopt the throw blasting - dragline backhoe stacking process, throw blasting is first carried out on the backhoe stripping bench, then the single - bucket truck process levels the blasted muck with the assistance of a bulldozer, and finally the dragline performs the backhoe stripping operation on the leveled standing platform.

[0004] If the working face parameters of the dragline backhoe stacking operation are not reasonably designed, it will increase the auxiliary workload, reduce the operation efficiency and production capacity of the dragline, and increase the stripping cost. Among the working face parameters of the dragline backhoe stacking operation, the height of the dragline standing platform directly affects the width of the dragline standing platform, the cycle time of the dragline backhoe stacking operation, the secondary backhoe volume of the dragline, and the auxiliary stripping volume of the bulldozer or single - bucket excavator, thus affecting the production cost and raw coal production capacity of the open - pit mine. Therefore, determining a reasonable height of the dragline standing platform in combination with the throw - blasting muck shape in the open - pit coal mine, the dragline specification parameters, and the raw coal production capacity of the open - pit mine is of great significance for the open - pit mine adopting the throw blasting - dragline backhoe stacking process to achieve continuous and stable raw coal production, give full play to the production capacity of the dragline, and reduce the mining cost.

[0005] That is to say, in the prior art, the throw blasting - dragline backhoe stacking process has the problem of low dragline operation efficiency due to the unreasonable design of the height of the dragline standing platform. Summary of the Invention

[0006] The main object of the present invention is to provide a method for determining the height of the standing platform of a dragline in the throw blasting - dragline backhoe stacking process, so as to solve the problem of low dragline operation efficiency in the prior art due to the unreasonable design of the height of the dragline standing platform.

[0007] To achieve the above object, according to one aspect of the present invention, there is provided a method for determining the height of the walking dragline standing platform in the throwing blasting - walking dragline backhoe dumping process, including: Step S10: Based on the historical data of the throwing blasting muck pile shape, establish a regression equation f(H 抛 ) between the throwing blasting bench height and the effective throwing rate; Step S20: Based on the historical data of the throwing blasting muck pile shape, establish a regression equation k(H 站 ) between the proportion of the walking dragline backhoe dumping volume in the total stripping operation volume and the height of the walking dragline standing platform; establish a regression equation g(H 站 ) between the proportion of the walking dragline secondary backhoe dumping volume in the total backhoe dumping volume and the height of the walking dragline standing platform; Step S30: Determine the height of the walking dragline standing platform when the production capacity of the walking dragline is fully exerted and the raw coal production is ensured to be continuous and stable according to formula (1),

[0008]

[0009] wherein, H 抛 is the throwing blasting bench height, with the unit of m; b is the mining strip width of the throwing blasting bench, with the unit of m; λ is the throwing blasting loose coefficient; H 站 is the height of the walking dragline standing platform, with the unit of m; M 2 is the annual backhoe dumping volume of the walking dragline in the throwing blasting - walking dragline backhoe dumping system, with the unit of m 3 ; H 煤 is the average thickness of the raw coal, with the unit of m; l 煤 is the length of the raw coal working face, with the unit of m; γ is the bulk density of the raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of the raw coal, with the unit of Mt / a; l 倒 is the length of the backhoe dumping working face, with the unit of m.

[0010] Further, Step S10 includes: collecting and sorting out the shape data of the throwing blasting muck pile; statistically analyzing the effective throwing rate under different throwing blasting bench height conditions; establishing a regression equation f(H 抛 ) between the throwing blasting bench height and the effective throwing rate through regression analysis of the effective throwing rate under different throwing blasting bench height conditions.

[0011] Further, step S20 includes: collecting and collating the morphological historical data of the muck pile of the throw blasting; drawing the sectional area profiles of each operation link of the throw blasting - dragline stripping system under different throw blasting bench heights and different dragline standing platform heights; statistically analyzing the sectional areas of each operation link within the throw blasting - dragline stripping system under different throw blasting bench heights and different dragline standing platform heights; establishing a regression equation k(H 站 ) for the proportion of the dragline stripping operation volume in the total stripping operation volume and the dragline standing platform height; establishing a regression equation g(H 站 ) for the proportion of the dragline secondary stripping volume in the total stripping operation volume and the dragline standing platform height.

[0012] Further, between step S20 and S30, it also includes: determining the sectional area S 站 of the dragline stripping operation according to formula (2) and the regression equation k(H 拉 ) for the proportion of the dragline stripping operation volume in the total stripping operation volume and the dragline standing platform height,

[0013] S = S 1 + S 2 + S 3 = H 抛 ·b·λ·[1 - f(H 抛 )]·[1 + g(H 站 )] Formula (2);

[0014] S 拉 = S 2 + S 3 = H 抛 ·b·λ·[1 - f(H 抛 )]·(1 + g(H 站 ))·k(H 站 ) Formula (3);

[0015] Formula (1) is obtained from Formula (3) and Formula (4),

[0016]

[0017] where S is the sectional area of the throw blasting - dragline stripping system, with the unit of m 2 ; S 1 is the sectional area of the auxiliary operation of the shovel - truck process, with the unit of m 2 ; S 2 is the sectional area of the first - stage stripping operation of the dragline, with the unit of m 2 ; S 3is the cross-sectional area of the second rehandling in the dragline rehandling operation, with the unit of m 2 ; H 抛 is the height of the bench in the throw blasting, with the unit of m; b is the width of the mining strip of the bench in the throw blasting, with the unit of m; λ is the loose coefficient of the throw blasting; H 站 is the height of the dragline standing platform, with the unit of m; S 拉 is the cross-sectional area of the dragline rehandling operation, with the unit of m 2 ; M 2 is the annual rehandling volume of the dragline in the throw blasting - dragline rehandling system, with the unit of m 3 ; H 煤 is the average thickness of the raw coal, with the unit of m; l 煤 is the length of the working line of the raw coal, with the unit of m; γ is the bulk density of the raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of the raw coal, with the unit of Mt / a; l 倒 is the length of the rehandling working line, with the unit of m.

[0018] Furthermore, 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 rehandling system and the annual production capacity of the raw coal according to the annual advance of the working line T’,

[0019]

[0020]

[0021] establishing a functional relationship between the annual rehandling volume of the dragline in the throw blasting - dragline rehandling system and the cross-sectional area S of the dragline rehandling operation 拉 of

[0022]

[0023] wherein, M 倒 is the annual operation volume of the rehandling system, with the unit of m 3 ; S is the cross-sectional area of the operation of the throw blasting - dragline rehandling system, with the unit of m 2 ; S 2 is the cross-sectional area of the first rehandling in the dragline rehandling operation, with the unit of m 2 ; S 3 is the cross-sectional area of the second rehandling in the dragline rehandling operation, with the unit of m 2 ; H 抛 is the height of the bench in the throw blasting, with the unit of m; b is the width of the mining strip of the bench in the throw blasting, with the unit of m; λ is the loose coefficient of the throw blasting; M 2 is the annual rehandling volume of the dragline in the throw blasting - dragline rehandling system, with the unit of m 3 ; H 煤is the average thickness of raw coal, with the unit of m; l 煤 is the working line length of raw coal, with the unit of m; γ is the bulk density of raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of raw coal, with the unit of Mt / a; l 倒 is the length of the stripping working line, with the unit of m; T’ is the annual advance of the working line, with the unit of m / a.

[0024] Further, in step S10, a quadratic regression equation f(H 抛 ) is established.

[0025] Further, in step S20, a quadratic regression equation k(H 站 ) is established.

[0026] Further, in step S20, a quadratic regression equation g(H 站 ) is established.

[0027] Applying the technical solution of the present invention, the method for determining the height of the dragline standing platform in the casting blasting - dragline stripping technology includes: Step S10: Based on the historical data of the casting blasting muck pile shape, establish a regression equation f(H 抛 ) between the casting blasting bench height and the effective casting rate; Step S20: Based on the historical data of the casting blasting muck pile shape, establish a regression equation k(H 站 ) between the proportion of the dragline stripping volume in the total stripping volume and the height of the dragline standing platform; establish a regression equation g(H 站 ) between the proportion of the dragline secondary stripping volume in the total stripping volume and the height of the dragline standing platform; Step S30: Determine the height of the dragline standing platform when the production capacity of the dragline is fully exerted and the raw coal production is ensured to be continuously stable according to formula (1),

[0028]

[0029] wherein, H 抛 is the casting blasting bench height, with the unit of m; b is the excavation belt width of the casting blasting bench, with the unit of m; λ is the casting blasting loosening coefficient; M 2 is the annual stripping volume of the dragline in the casting blasting - dragline stripping system, m 3 ; H 煤 is the average thickness of raw coal, with the unit of m; l 煤 is the working line length of raw coal, with the unit of m; γ is the bulk density of raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of raw coal, with the unit of Mt / a; l 倒 is the length of the stripping working line, with the unit of m.

[0030] Through step S10, by analyzing the historical data of the muck pile shape of the throw blasting, the shape of the muck pile curve formed after the throw blasting of the stripping bench can be determined, and the effective throwing rate at different heights of the throw blasting bench can be statistically analyzed, which is convenient for clarifying the relationship between the height of the throw blasting bench and the effective throwing rate, and establishing a regression equation f(H 抛 ), so as to predict the effective throwing rate at different heights of the throw blasting bench.

[0031] It should be noted that after the throw blasting of the stripping bench, a part of the stripped material is directly thrown into the range of the dump pile where the dragline in the inner waste dump performs the backfilling operation. This part is called the effective throwing amount and does not need to be stripped by the dragline for backfilling again. The ratio of the effective throwing amount in the total throw blasting amount is the effective throwing rate. When the geological conditions and throw blasting parameters in the throw blasting area do not change significantly, the effective throwing rate of the throw blasting bench is mainly affected by the height of the throw blasting bench.

[0032] Through step S20, by analyzing the historical data of the muck pile shape of the throw blasting, the influence of the height of the dragline standing platform on the dragline backfilling operation amount, the dragline secondary backfilling amount, the total stripping operation amount, and the total backfilling operation amount can be determined, and a regression equation k(H 站 ) of the proportion of the dragline backfilling operation amount in the total stripping operation amount and the height of the dragline standing platform, and a regression equation g(H 站 ) of the proportion of the dragline secondary backfilling amount in the total backfilling operation amount and the height of the dragline standing platform are established to predict the dragline backfilling operation amount, the dragline secondary backfilling amount, the total stripping operation amount, and the total backfilling operation amount at different heights of the dragline standing platform.

[0033] It should be noted that the effective throwing amount after the throw blasting of the stripping bench does not need to be stripped by the dragline for backfilling again. The upper layer of the muck pile after the throw blasting is leveled by the shovel-truck process with the assistance of a bulldozer. After the muck pile after the throw blasting is leveled, a standing platform for the dragline backfilling operation is formed. The extended part outside the standing platform is constructed by the stripped material from the upper layer of the muck pile. This part of the stripped material needs to be backfilled to the inner waste dump by the dragline for secondary backfilling. This part of the stripped amount is the dragline secondary backfilling amount.

[0034] Through step S30, the height of the dragline standing platform is determined by formula (1) to give full play to the production capacity of the dragline, ensure the continuity of raw coal production, reduce the stripping cost of the throw blasting - dragline backfilling process system, and improve the mining efficiency. Description of the Drawings

[0035] The attached drawings of the specification, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0036] Figure 1 Shows a schematic diagram of coal mining and dragline stripping operation according to an alternative embodiment of the present invention;

[0037] Figure 2 Shows Figure 1 a schematic diagram of the effective throw profile of the throw blasting - dragline stripping process system in

[0038] Figure 3 Shows Figure 1 a sectional view of the operation areas of each link in the throw blasting - dragline stripping system in

[0039] Figure 4 Shows Figure 1 a schematic layout diagram of the integrated mining process system in

[0040] Figure 5 Shows Figure 1 a muck pile profile diagram when the throw blasting bench height is 35m in

[0041] Figure 6 Shows Figure 1 a muck pile profile diagram when the throw blasting bench height is 40m in

[0042] Figure 7 Shows Figure 1 a muck pile profile diagram when the throw blasting bench height is 45m in

[0043] Figure 8 Shows Figure 1 a muck pile profile diagram when the throw blasting bench height is 50m in

[0044] Figure 9 Shows Figure 1 the relationship between the throw blasting bench height and the effective throw rate in

[0045] Figure 10 Shows Figure 1 a sectional view of the operation volume of each link in the throw blasting - dragline stripping process system in

[0046] Figure 11 Shows Figure 1 the proportion of the operation volume of each part in the stripping system when the throw blasting bench height is 40m in

[0047] Figure 12 Shows Figure 1 the proportion of the operation volume of each part in the stripping system when the throw blasting bench height is 45m in

[0048] Figure 13 Shows Figure 1 the proportion of the operation volume of each part in the stripping system when the throw blasting bench height is 50m in

[0049] Figure 14 shows Figure 1 a flowchart of a method for determining the height of the dragline standing platform in the throw blasting - dragline stripping technology

[0050] Among them, the above - mentioned drawings include the following reference numerals:

[0051] 1. Waste dump; 2. Dragline; 3. Dragline standing platform; 4. Coal seam roof; 5. Electric shovel; 6. Throw - blasting muck pile; 7. Coal - hauling passage; 8. Truck - dumped loess; 9. Truck - dumped rock; 10. Loess layer; 11. Upper rock stratum; 12. Lower rock stratum; 13. Coal seam Specific embodiments

[0052] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments

[0053] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs

[0054] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer relative to the contour of each component itself, but the above - mentioned orientation words do not limit the present invention

[0055] To solve the problem that in the prior art, due to the unreasonable design of the height of the dragline standing platform in the throw - blasting - dragline stripping technology, the operation efficiency of the dragline is low, the present invention provides a method for determining the height of the dragline standing platform in the throw - blasting - dragline stripping technology

[0056] As Figures 1 to 14 shown, the method for determining the height of the dragline standing platform in the throw - blasting - dragline stripping technology includes: Step S10: Based on the historical data of the shape of the throw - blasting muck pile 6, establish a regression equation f(H 抛 ) between the throw - blasting bench height and the effective throw rate; Step S20: Based on the historical data of the shape of the throw - blasting muck pile 6, establish a regression equation k(H 站 ) between the proportion of the dragline stripping operation volume in the total stripping operation volume and the height of the dragline standing platform; Establish a regression equation g(H 站) Step S30: Determine the height of the dragline standing platform when the production capacity of the dragline is fully utilized and the raw coal production is ensured to be continuous and stable according to formula (1).

[0057]

[0058] where H 抛 is the height of the cast blasting bench, in m; b is the width of the cast blasting bench excavation belt, in m; λ is the cast blasting loose coefficient; H 站 is the height of the dragline standing platform, in m; M 2 is the annual dragline backfilling operation volume in the cast blasting-dragline backfilling system, in m 3 ; H 煤 is the average thickness of the raw coal, in m; l 煤 is the length of the raw coal working line, in m; γ is the bulk density of the raw coal, in t / m 3 ; M 煤 is the annual production capacity of the raw coal, in Mt / a; l 倒 is the length of the backfilling working line, in m.

[0059] By step S10, analyzing the morphological historical data of the cast blasting muck pile 6, the curve shape of the cast blasting muck pile 6 formed after the cast blasting of the stripping bench can be clarified, and the effective casting rate under different cast blasting bench heights can be statistically analyzed, which is convenient for clarifying the relationship between the cast blasting bench height and the effective casting rate, and establishing the regression equation f(H 抛 ) of the cast blasting bench height and the effective casting rate, so as to predict the effective casting rate under different cast blasting bench heights.

[0060] It should be noted that as Figure 2 shown, after the cast blasting of the stripping bench, a part of the stripped material is directly cast into the spoil bank 1 range where the dragline in the inner waste dump backfills and discards, and this part is called the effective casting volume and does not need to be backfilled by the dragline again (as shown by the shaded part in Figure 2 ). The ratio of the effective casting volume in the total cast blasting volume is the effective casting rate. When the geological conditions and cast blasting parameters in the cast blasting area do not change significantly, the effective casting rate of the cast blasting bench is mainly affected by the cast blasting bench height.

[0061] By step S20, analyzing the morphological historical data of the cast blasting muck pile 6, the influence of the height of the dragline standing platform on the dragline backfilling operation volume, the dragline secondary backfilling volume, the total stripping operation volume and the total backfilling operation volume can be clarified, and the regression equation k(H 站), and the regression equation g(H of the proportion of the secondary dumping volume of the dragline in the total dumping operation volume and the height of the dragline standing platform 站 ), predict the dragline dumping operation volume, the secondary dumping volume of the dragline, the total stripping operation volume, and the total dumping operation volume under different heights of the dragline standing platform.

[0062] It should be noted that for the effective throwing volume after the bench casting blast for stripping, there is no need to dump and strip it with a dragline. The upper layer of the casting blast heap 6 is leveled by the shovel-truck process with the assistance of a bulldozer. After the casting blast heap 6 is leveled, a standing platform for the dragline dumping operation is formed. The extended part outside the standing platform is constructed by the overburden from the upper layer of the casting blast heap 6. This part of the overburden needs to be secondarily dumped by the dragline and discharged to the internal waste dump. This part of the stripping volume is the secondary dumping volume of the dragline.

[0063] Through step S30, determine the height of the dragline standing platform by formula (1) to give full play to the production capacity of the dragline, ensure the continuous production of raw coal, reduce the stripping cost of the casting blast-dragline dumping process system, and improve the mining efficiency.

[0064] Specifically, step S10 includes: collecting and sorting out the morphological data of the casting blast heap 6; statistically analyzing the effective throwing rate under different bench heights of the casting blast; through the regression analysis of the effective throwing rate under different bench heights of the casting blast, establish the regression equation f(H of the bench height of the casting blast and the effective throwing rate 抛 ). In the process of collecting and sorting out the morphological data of the casting blast heap 6, some morphological data of the casting blast heap 6 that are closest to the actual situation of coal mine mining can be selected to statistically analyze the effective throwing rate under different bench heights of the casting blast, and then conduct a regression analysis on the effective throwing rate. Through the regression equation f(H 抛 ), predict the effective throwing rate under different bench heights of the casting blast.

[0065] As Figure 3 shown, step S20 includes: collecting and sorting out the historical morphological data of the casting blast heap 6; drawing the cross-sectional area profiles of each operation link of the casting blast-dragline dumping system under different bench heights of the casting blast and different heights of the dragline standing platform; statistically analyzing the cross-sectional areas of each operation link within the casting blast-dragline dumping system under different bench heights of the casting blast and different heights of the dragline standing platform; according to the cross-sectional areas of each operation link within the casting blast-dragline dumping system under different bench heights of the casting blast and different heights of the dragline standing platform, establish the regression equation k(H of the proportion of the dragline dumping operation volume in the total stripping operation volume and the height of the dragline standing platform 站 ); establish the regression equation g(H of the proportion of the secondary dumping volume of the dragline in the total dumping operation volume and the height of the dragline standing platform站 )。

[0066] In the process of collecting and sorting out the morphological data of the throw blasting muck pile 6, the closest morphological form of the throw blasting muck pile 6 can be selected according to the actual situation of coal mine exploitation. Under the condition of a certain throw blasting bench height and the height of the dragline standing platform, the sectional area profile diagrams of the operations of each link of the throw blasting-dragline backhoe system can be obtained, which is convenient for obtaining the sectional areas of the operations of each link within the throw blasting-dragline backhoe system, that is, the sectional areas of the auxiliary operations of the shovel-truck process, the first-time backhoe operation of the dragline, the second-time backhoe operation of the dragline, the area outside the dragline standing platform 3 where no backhoe operation is required, and the effective throw amount of the throw blasting. Furthermore, it is convenient to analyze the proportion of the dragline backhoe operation volume in the total stripping operation volume and the proportion of the second-time backhoe volume of the dragline in the total backhoe operation volume.

[0067] It should be noted that when drawing the sectional area profile diagrams of the operations of each link of the throw blasting-dragline backhoe system, it is necessary to first scan the historical morphological diagram of the throw blasting muck pile 6, and then draw the sectional area profile diagrams of the operations of each link according to the scanned image.

[0068] Under the condition of this throw blasting bench height, different heights of the dragline standing platform are selected, and the above process is repeated to statistically analyze the data, and a regression equation k(H 站 ) of the proportion of the dragline backhoe operation volume in the total stripping operation volume and the height of the dragline standing platform and a regression equation g(H 站 ) of the proportion of the second-time backhoe volume of the dragline in the total backhoe operation volume and the height of the dragline standing platform can be established, so as to predict the dragline backhoe operation volume, the second-time backhoe volume of the dragline, and the total backhoe operation volume under different heights of the dragline standing platform.

[0069] Change the throw blasting bench height, repeat the above process, and realize the statistical analysis of different throw blasting bench heights and different heights of the dragline standing platform.

[0070] It should be noted that the throw blasting bench height and the height of the dragline standing platform are not randomly selected, but the range is determined according to the historical data of the actual surface coal mine exploitation situation to ensure that the analyzed content does not deviate from the needs of production practice.

[0071] It should be noted that the sectional area S 1 of the auxiliary operation of the shovel-truck process, the sectional area S 3 of the second-time backhoe of the dragline backhoe operation, and the sectional area S 4 of the part outside the dragline standing platform 3 where no backhoe operation is required satisfy the following relationship:

[0072] S 1 =k y ·(S 3 +S4 ) Formula (6);

[0073] where k y is the compaction coefficient after leveling the muck pile 6 of the throw blasting.

[0074] It should be noted that the cross-sectional area S of the effective throwing volume of the throw blasting 5 can be defined by Formula (7),

[0075] S 5 = H 抛 · b · λ · f(H 抛 ) Formula (7).

[0076] Specifically, between steps S20 and S30, it also includes: determining the cross-sectional area S of the dragline casting operation according to Formula (2) and the regression equation of the proportion of the dragline casting operation volume in the total stripping operation volume and the height of the dragline standing platform k(H 站 ); 拉 ;

[0077] S = S 1 + S 2 + S 3 = H 抛 · b · λ · [1 - f(H 抛 )] · [1 + g(H 站 )] Formula (2);

[0078] S 拉 = S 2 + S 3 = H 抛 · b · λ · [1 - f(H 抛 )] · (1 + g(H 站 )) · k(H 站 ) Formula (3);

[0079] Formula (1) is obtained from Formula (3) and Formula (4),

[0080]

[0081] where S is the cross-sectional area of the throw blasting - dragline casting system operation, with the unit of m 2 ; S 1 is the cross-sectional area of the auxiliary operation of the shovel-truck process, with the unit of m 2 ; S 2 is the cross-sectional area of one-time casting operation of the dragline casting, with the unit of m 2 ; S 3 is the cross-sectional area of the secondary casting operation of the dragline casting, with the unit of m 2 ; H 抛is the height of the bench for throw blasting, in m; b is the width of the mining strip of the bench for throw blasting, in m; λ is the loose coefficient of throw blasting; H 站 is the height of the standing platform of the dragline, in m; S 拉 is the cross-sectional area of the dragline's backfilling operation, in m 2 ; M 2 is the annual backfilling operation volume of the dragline in the throw blasting-dragline backfilling system, in m 3 ; H 煤 is the average thickness of the raw coal, in m; l 煤 is the length of the working line of the raw coal, in m; γ is the bulk density of the raw coal, in t / m 3 ; M 煤 is the annual production capacity of the raw coal, in Mt / a; l 倒 is the length of the backfilling working line, in m.

[0082] Through the regression equation k(H 站 ) of the proportion of the dragline's backfilling operation volume in the total stripping operation volume and the height of the dragline's standing platform, and the cross-sectional area of the throw blasting-dragline backfilling system, the cross-sectional area S 拉 of the dragline's backfilling operation can be obtained; and the annual backfilling operation volume of the dragline in the throw blasting-dragline backfilling system can be obtained from formula (4), that is, the annual backfilling operation volume of the dragline in the throw blasting-dragline backfilling system can be correspondingly obtained from the cross-sectional area of the dragline's backfilling operation.

[0083] Specifically, 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 backfilling system and the annual production capacity of the raw coal according to the annual advance of the working line T’,

[0084]

[0085]

[0086] Establishing a functional relationship between the annual backfilling operation volume of the dragline in the throw blasting-dragline backfilling system and the cross-sectional area S 拉 of the dragline's backfilling operation according to formula (5),

[0087]

[0088] where, M 倒 is the annual operation volume of the backfilling system, in m 3 ; S is the cross-sectional area of the throw blasting-dragline backfilling system, in m 2 ; S 2 is the cross-sectional area of a single backfilling operation of the dragline's backfilling operation, in m 2 ; S 3is the cross-sectional area of the secondary dumping for dragline stripping operation, with the unit of m 2 ; H 抛 is the height of the cast blasting bench, with the unit of m; b is the width of the mining strip of the cast blasting bench, with the unit of m; λ is the loose coefficient of cast blasting; M 2 is the annual dumping operation volume of the dragline in the cast blasting-dragline stripping system, with the unit of m 3 ; H 煤 is the average thickness of raw coal, with the unit of m; l 煤 is the length of the raw coal working line, with the unit of m; γ is the bulk density of raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of raw coal, with the unit of Mt / a; l 倒 is the length of the dumping working line, with the unit of m; T’ is the annual advance of the working line, with the unit of m / a.

[0089] As Figure 1 shown, in the cast blasting-dragline stripping process of the open-pit coal mine, the dragline 2 and the electric shovel 5 are used to dump the blasted materials in the cast blasting muck pile 6 to the waste dump 1, and the produced coal is transported to the raw coal crushing station through the coal transportation channel 7. The coal mining and the dragline stripping working face adopt a tracking mining layout. Therefore, the advance of the stripping system should be consistent with that of the coal mining working line. Thus, the functional relationship between the annual operation volume of the stripping system and the annual production capacity of raw coal in formula (5) is obtained, and the annual dumping operation volume of the dragline is obtained corresponding to the cross-sectional area of the dragline stripping operation.

[0090] It should be noted that the annual advance T’ of the working line can be limited by formula (8),

[0091]

[0092] According to formula (5), the annual auxiliary operation volume M of the shovel-truck can also be obtained 1 ,

[0093]

[0094] Specifically, in step S10, a univariate quadratic regression equation f(H 抛 ) is established. The regression equation f(H 抛 ) is in the form of a univariate quadratic equation with a relatively small error, and can more effectively analyze the effective casting rate under different heights of the cast blasting bench.

[0095] Specifically, in step S20, a univariate quadratic regression equation k(H 站 ) is established. The regression equation k(H 站 ) is in the form of a univariate quadratic equation with a relatively small error, and can more effectively analyze the proportion of the dragline stripping operation volume in the total stripping operation volume under different heights of the dragline standing platform.

[0096] Specifically, in step S20, a unary quadratic regression equation g(H 站 ) is established. The regression equation g(H 站 ) is in the form of a unary quadratic equation with a relatively small form error, and can more effectively analyze the proportion of the secondary dumping volume of the dragline in the total dumping operation volume under different heights of the dragline standing platform.

[0097] Taking a certain large open-pit coal mine as an example, the designed raw coal production capacity is 12.0 Mt / a. The average strike length of the bottom of the mine field mining boundary is 7.8 km, the average dip width is 5.09 km, and the area is 40.25 km 2 , with an average depth of 140 m. The average thickness of the 13 workable coal seams within the boundary is 28.8 m, and the workable raw coal reserve is 1.4 billion tons.

[0098] As Figure 4 shown, this large open-pit coal mine adopts a comprehensive mining process. For the stripping of the 10 loess layer and the upper 11 rock layer, a single-bucket truck process is used, forming 8 truck-dumped loess and 9 truck-dumped rocks. For the stripping of the 12 lower rock layer about 45 m thick above the 4 coal seam roof, a dragline backhoe process is used. For the mining of the 13 coal seam, a single-bucket truck-surface semi-fixed crushing station semi-continuous mining process is used. Figure 4 Illustrates the restrictive relationship between the throw blasting-dragline backhoe stripping bench and the coal mining bench.

[0099] In this embodiment, the process of determining the height of the dragline standing platform is as follows:

[0100] 1) Establish a regression equation between the height of the throw blasting bench and the effective throw rate. As Figures 5 to 8 shown, select the typical cross-sectional view of the 6 throw blasting muck pile of this large open-pit coal mine, and count the effective throw rate under different heights of the throw blasting bench. Based on the typical cross-sectional data of the 6 throw blasting muck pile, establish the regression function relationship between the effective throw rate and the height of the throw blasting bench as Figure 9 shown, and obtain formula (10),

[0101]

[0102] 2) Draw the operation volume cross-sectional views of each link of the throw blasting-dragline backhoe system. Referring to the typical throw blasting muck pile 6 curve when the height of the throw blasting bench is 45 m, draw the operation volume cross-sectional views of each link in the throw blasting-dragline backhoe process system when the height of the throw blasting bench is 45 m and the height of the dragline standing level is 18 m, as Figure 10 shown. According to the principle of equal area, the relationship between the cross-sectional areas of S1 and S3, S4 in the figure is:

[0103] S 1 = k y·(S 3 +S 4 ) Formula (6);

[0104] where k y is the compaction coefficient, taking 0.8.

[0105] Refer to Figure 10 , and draw the sectional views of the operation volumes of each link in the cast blasting - dragline stripping process system under the conditions that the height of the cast blasting bench is 40m, 45m, and 50m, and the height of the dragline standing platform is from 11m to 18m respectively.

[0106] 3) Analysis of the height of the dragline standing platform and the operation cross-sectional area. Based on the sectional views of the operation volumes of each link at different heights of the dragline standing platform drawn, the cross-sectional areas corresponding to the operation parts of each link can be directly measured from the figures, and the operation cross-sectional areas of each link under different heights of the dragline standing platform are counted, as shown in Tables 1 to 3.

[0107] Under the condition that the height of the cast blasting bench is 40m, the loose coefficient is 1.36, the effective casting rate is 0.365, and the compaction rate is 0.8. The dragline operation cross-sectional area, secondary stripping operation cross-sectional area, and shovel-truck operation cross-sectional area at different horizontal heights of the dragline are shown in Table 1.

[0108] Standing horizontal height of dragline (m) <![CDATA[Cross-sectional area of dragline operation (m 2 )]]> <![CDATA[Cross-sectional area of the secondary piling operation (m 2 )]]> <![CDATA[Cross-sectional area of single-bucket truck operation (m 2 )]]> 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

[0109] Table 1

[0110] Under the condition that the height of the cast blasting bench is 45m, the loose coefficient is 1.45, the effective casting rate is 0.378, and the compaction rate is 0.8. The dragline operation cross-sectional area, secondary stripping operation cross-sectional area, and shovel-truck operation cross-sectional area at different horizontal heights of the dragline are shown in Table 2.

[0111] Standing horizontal height of dragline (m) <![CDATA[Cross-sectional area of dragline operation (m 2 )]]> <![CDATA[Cross-sectional area of the secondary piling operation (m 2 )]]> <![CDATA[Cross-sectional area of single-bucket truck operation (m 2 )]]> 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

[0112] Table 2

[0113] Under the condition that the height of the cast blasting bench is 50m, the loose coefficient is 1.52, the effective casting rate is 0.39, and the compaction rate is 0.8. The dragline operation cross-sectional area, secondary stripping operation cross-sectional area, and shovel-truck operation cross-sectional area at different horizontal heights of the dragline are shown in Table 3.

[0114] Standing horizontal height of dragline (m) <![CDATA[Cross-sectional area of dragline operation (m 2 )]]> <![CDATA[Cross-sectional area of the secondary piling operation (m 2 )]]> <![CDATA[Cross-sectional area of single-bucket truck operation (m 2 )]]> 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

[0115] Table 3

[0116] 4) Establish the regression functions between the operation volumes of each link in the throw blasting - dragline stripping system and the height of the dragline standing platform. Based on the data in Tables 1 to 3, establish the regression function relationship between the proportion of the operation volume of each link in the throw blasting - dragline stripping system in the total stripping operation volume and the height of the dragline standing platform, as Figures 11 to 13 shown.

[0117] Under the conditions of different throw blasting bench heights, the regression functions between the proportion of the dragline stripping operation volume and the secondary stripping operation volume in the total stripping operation volume and the height of the dragline standing platform are as follows.

[0118] When the throw blasting bench height is 40 m, the regression function relationship between the proportion of the dragline stripping operation volume in the total stripping operation volume and the height of the dragline standing platform is:

[0119]

[0120] The regression function relationship between the proportion of the secondary stripping volume of the dragline in the total stripping operation volume and the height of the dragline standing platform is:

[0121]

[0122] When the throw blasting bench height is 45 m, the regression function relationship between the proportion of the dragline stripping operation volume in the total stripping operation volume and the height of the dragline standing platform is:

[0123]

[0124] The regression function relationship between the proportion of the secondary stripping volume of the dragline in the total stripping operation volume and the height of the dragline standing platform is:

[0125]

[0126] When the throw blasting bench height is 50 m, the regression function relationship between the proportion of the dragline stripping operation volume in the total stripping operation volume and the height of the dragline standing platform is:

[0127]

[0128] The regression function relationship between the proportion of the secondary stripping volume of the dragline in the total stripping operation volume and the height of the dragline standing platform is:

[0129]

[0130] 5) Determine the height of the dragline standing platform. The annual stripping production capacity of the dragline in this large - scale open - pit coal mine is 16 million m³ 3 / a, the planned raw coal output is 34 million t / a, the width of the mining and excavation belt of the throwing blasting bench is 85 m, the length of the backhoe working line is 1550 m, the length of the coal mining working line is 2300 m, and the average bulk density of the raw coal is 1.47 t / m 3 , based on the above parameters, by solving formula (1), the reasonable height of the dragline standing platform for each mining and excavation belt can be determined, as shown in Table 4.

[0131]

[0132]

[0133] Table 4

[0134] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0135] 1. Based on the morphological historical data of the throwing blasting muck pile 6, establish the regression function relationships between the height of the throwing blasting bench and the effective throwing rate, the height of the dragline standing platform and the proportion of the secondary backhoe volume of the dragline in the total backhoe volume, and the proportion of the dragline backhoe volume in the total stripping volume, establish the mathematical model of the dragline standing platform height, and determine the reasonable height of the dragline standing platform to give full play to the production capacity of the dragline.

[0136] 2. Under the condition of a reasonable height of the dragline standing platform, the production capacity of the dragline can be fully exerted, the stripping cost of the throwing blasting - dragline backhoe process system can be reduced, and the continuous and stable production of raw coal can be ensured.

[0137] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0138] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0139] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0140] The above are only the 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 variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process, characterized in that, it includes: Step S10: Based on the historical data of the muckpile (6) shape of the throw blasting, establish a regression equation f(H 抛 ) of the bench height of the throw blasting and the effective throwing rate; Step S20: Based on the morphological historical data of the muck pile (6) formed by the throw blasting, establish a regression equation of the proportion of the stripping volume by the dragline in the total stripping volume with respect to the height of the dragline standing platform k(H 站 ); establish a regression equation of the proportion of the secondary stripping volume by the dragline in the total stripping volume with respect to the height of the dragline standing platform g(H 站 ); Step S30: Determine the height of the dragline standing platform when the production capacity of the dragline is fully exerted and the raw coal production is ensured to be continuous and stable according to formula (1), Among them, H 抛 is the height of the cast blasting bench, with the unit of m; b is the width of the mining belt of the cast blasting bench, with the unit of m; λ is the loose coefficient of cast blasting; H 站 is the height of the dragline standing platform, with the unit of m; M 2 is the annual dragline backfilling operation volume in the cast blasting - dragline backfilling system, with the unit of m 3 ; H 煤 is the average thickness of raw coal, with the unit of m; l 煤 is the length of the raw coal working line, with the unit of m; γ is the bulk density of raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of raw coal, with the unit of Mt / a; l 倒 is the length of the backfilling working line, with the unit of m; wherein, step S10 includes: Collect and collate the morphological data of the throw blasting muck pile (6); Statistically analyze the effective throwing rate under different throw blasting bench heights; By performing a regression analysis on the effective throwing rates under different conditions of the throwing blasting bench height, the regression equation f(H 抛 ) between the throwing blasting bench height and the effective throwing rate is established; wherein, step S20 includes: Collect and collate the historical morphological data of the throw blasting muck pile (6); Draw the sectional area profiles of each operation link of the throw blasting - dragline stripping system under different throw blasting bench heights and different dragline standing platform heights; Statistically analyze the sectional areas of each operation link in the throw blasting - dragline stripping system under different throw blasting bench heights and different dragline standing platform heights; According to the cross-sectional areas of each operation link in the throwing blasting - dragline stripping system under different throwing blasting bench heights and different dragline standing platform heights, establish the regression equation k(H 站 ) of the proportion of the dragline stripping operation volume in the total stripping operation volume to the dragline standing platform height; establish the regression equation g(H 站 ) of the proportion of the dragline secondary stripping volume in the total stripping operation volume to the dragline standing platform height.

2. The method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process according to claim 1, characterized in that, Between step S20 and S30, it further includes: According to formula (2) and the regression equation of the proportion of the stripping work volume of the dragline in the total stripping work volume and the height of the dragline standing platform k(H 站 ), formula (3) is obtained. S = S 1 + S 2 + S 3 = H 抛 ·b·λ·[1 - f(H 抛 )]·[1 + g(H 站 )] Formula (2); S 拉 = S 2 + S 3 = H 抛 ·b·λ·[1 - f(H 抛 )]·(1 + g(H 站 ))·k(H 站 ) Formula (3); Formula (1) is obtained from formula (3) and formula (4), Among them, S is the cross-sectional area of the cast blasting - dragline stripping system operation, with the unit of m 2 ; S 1 is the cross-sectional area of the auxiliary operation of the shovel - truck technology, with the unit of m 2 ; S 2 is the cross-sectional area of a single dragline stripping operation, with the unit of m 2 ; S 3 is the cross-sectional area of the second dragline stripping operation, with the unit of m 2 ; H 抛 is the height of the cast blasting bench, with the unit of m; b is the width of the mining belt of the cast blasting bench, with the unit of m; λ is the loose coefficient of cast blasting; H 站 is the height of the dragline standing platform, with the unit of m; S 拉 is the cross-sectional area of the dragline stripping operation, with the unit of m 2 ; M 2 is the annual dragline stripping operation volume of the dragline in the cast blasting - dragline stripping system, with the unit of m 3 ; H 煤 is the average thickness of the raw coal, with the unit of m; l 煤 is the length of the raw coal working line, with the unit of m; γ is the bulk density of the raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of the raw coal, with the unit of Mt / a; l 倒 is the length of the stripping working line, with the unit of m.

3. The method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process according to claim 2, characterized in that, During the process of obtaining formula (1) from formula (3) and formula (4), it further includes: Establish a functional relationship between the annual operation volume of the stripping system and the annual raw coal production capacity according to the annual advance of the working line T', Establish the functional relationship between the annual dumping volume of the dragline in the casting blasting-dragline stripping system and the cross-sectional area S of the dragline stripping operation according to formula (5). 拉 of the function relation Among them, M 倒 is the annual operation volume of the backhoe system, with the unit of m 3 ; S is the cross-sectional area of the casting blasting - dragline backhoe system operation, with the unit of m 2 ; S 2 is the cross-sectional area of a single backhoe operation in the dragline backhoe system, with the unit of m 2 ; S 3 is the cross-sectional area of the second backhoe operation in the dragline backhoe system, with the unit of m 2 ; H 抛 is the height of the casting blasting bench, with the unit of m; b is the width of the mining belt of the casting blasting bench, with the unit of m; λ is the loose coefficient of casting blasting; M 2 is the annual backhoe operation volume of the dragline in the casting blasting - dragline backhoe system, with the unit of m 3 ; H 煤 is the average thickness of raw coal, with the unit of m; l 煤 is the length of the raw coal working line, with the unit of m; γ is the bulk density of raw coal, with the unit of t / m 3 ; M 煤 is the annual production capacity of raw coal, with the unit of Mt / a; l 倒 is the length of the backhoe working line, with the unit of m; T’ is the annual advance rate of the working line, with the unit of m / a.

4. The method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process according to claim 1, characterized in that, In step S10, a univariate quadratic regression equation f(H 抛 ) is established.

5. The method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process according to claim 1, characterized in that, In step S20, a quadratic regression equation k(H 站 ) is established.

6. The method for determining the height of the dragline standing platform in the throw blasting - dragline stripping process according to claim 1, characterized in that, In step S20, a unary quadratic regression equation g(H 站 ) is established.

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