CN112267886B - Strip mine mining and transporting method - Google Patents
Strip mine mining and transporting method Download PDFInfo
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- CN112267886B CN112267886B CN202011125205.4A CN202011125205A CN112267886B CN 112267886 B CN112267886 B CN 112267886B CN 202011125205 A CN202011125205 A CN 202011125205A CN 112267886 B CN112267886 B CN 112267886B
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- conveyor
- crushing station
- stope
- ditching
- working
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
- E21C47/02—Machines for obtaining or the removal of materials in open-pit mines for coal, brown coal, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application discloses a strip mine mining and transporting method, which comprises the following steps: performing full-head ditching on the ground surface covering on one side of the stope working side close to the ground surface crushing station to form a ditching section ditch advanced in the advancing direction of the stope working side; a crushing station is arranged in the ditching ditch at a preset distance from the ditching ditch working side; laying a first conveyor; mineral aggregate crushed by the crushing station is directly transported out of the stope through the first conveyor. Utilize this application to need not to follow end group walking transportation mineral aggregate step by step through the truck, can reduce the distance of transport greatly, improve conveying efficiency.
Description
Technical Field
The application relates to the technical field of coal mines, in particular to a strip mine mining and transporting method.
Background
Currently, in open pit mining, trucks are mostly used to transport coal out of pit bottoms of stopes. During transportation, trucks need to walk step by step along the highwalls. The inventor finds that as the strip mine is continuously mined, the distance between trucks becomes longer, and the coal conveying cost is increased continuously.
Disclosure of Invention
In view of the above, the present application proposes a strip mining transportation method to solve the above technical problems.
The application provides a strip mine mining and transporting method, which comprises the following steps: performing full-head ditching on the ground surface covering on one side of the stope working side close to the ground surface crushing station to form a ditching section ditch advanced in the advancing direction of the stope working side; a crushing station is arranged in the ditching ditch at a preset distance from the ditching ditch working side; laying a first conveyor; mineral aggregate crushed by the crushing station is directly transported out of the stope through the first conveyor.
Optionally, the mineral aggregate crushed by the crushing station is transported directly out of the stope via the first conveyor, comprising before: arranging a discharging platform in the open section ditch; on the discharge platform, mineral aggregate is discharged into a crushing station.
Optionally, the width of the open channel is W k Length L k ；W k =2a+b+c+2d; a is the turning radius of the transport means; b is the width of a mineral aggregate transporting channel; c is the width affected by the inclination angle of the first conveyor; d is the safe distance between the devices; l (L) k ＝1/2W x +2E+F+G+H+2A；W x For the width of the unloading platform, E is the flat slope distance, F is the horizontal projection of a mineral aggregate transporting channel, G is the width of a stope working side blasting area parallel to the pushing direction, and H is the distance between the crushing station and a stope working flat disc at the same horizontal height.
Alternatively, the predetermined distance L p ＝0.5W x +2E+F+G+2A。
Optionally, the working flat plate of the working side of the ditching is B norm ，
B norm ＝H/cotα-B min (n-1); wherein alpha is the final slope angle, B min The minimum working flat plate width is H, the total height of the working side of the ditching groove is H, and n is the number of the working flat plates.
Optionally, the height of the first step of the open-section trench directly connected with the coal seam roof is equal to the height of the crushing station.
Optionally, the unloading platform is located on a flat plate of the open-section ditch end upper above the first step, and the width of the flat plate of the open-section ditch end upper is equal to the sum of the length of the unloading platform and the width of the mineral aggregate transporting channel.
Optionally, the tail of the first conveyor is arranged at the bottom of the open-section ditch, the nose discharge opening of the first conveyor is positioned on the ground surface, and the inclination angle of the first conveyor is larger than 34 degrees.
Optionally, the method further comprises: when the spacing between the crushing station and the stope working flat plate at the same level is D p *S g At the same time, the first conveyor and the crushing station are moved and arranged p The time required for the crushing station to move once S g The daily propulsion speed is used for stope work.
Alternatively, for the formula F (L) =c/L- (Q) k +Q j ) Obtaining an optimal solution as a moving step distance L of the crushing station, wherein L is less than or equal to V f /T 1 C is the cost of single movement of the crushing station, Q k For truck transportation cost, Q j For the first conveyor transportation cost, V f Is the surplus soil discharging space of the inner soil discharging field, T 1 The amount of dig generated for each forward propulsion of the trench segment of 1 m.
According to the strip mine exploitation and transportation method, the pit is fully dug through the earth surface covering on one side of the stope working side, which is close to the earth surface crushing station, the open section trench advanced in the advancing direction of the stope working side is formed, the first conveyor and the crushing station are arranged in the open section trench, crushed materials are directly transported out of the stope through the first conveyor, a truck is not required to walk along the end side step by step, the transportation distance can be greatly reduced, and the transportation efficiency is improved.
Drawings
Fig. 1 is a flow chart of a strip mine mining transportation method of the present application.
Fig. 2 is a mining schematic diagram of the strip mine mining transportation method of the present application.
Detailed Description
The following describes the technical scheme of the present application in detail with reference to the accompanying drawings and specific embodiments. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Fig. 1 shows a flowchart of a strip mine mining transportation method of the present application, and as shown in fig. 1, the strip mine mining transportation method provided by the present application includes:
s100, performing head-type ditching on a ground surface covering on one side of a stope working side close to a ground surface crushing station to form a ditching ditch advanced in the advancing direction of the stope working side;
as shown in fig. 2, the direction of propulsion is upward. One side of the open section ditch 1 is an open section ditch end wall 2, the other side is a stope end wall 3, the open section ditch end wall 2 and the stope end wall 3 are arranged oppositely, and the ditch bottom 4 of the open section ditch 1 is positioned on the coal seam roof 5.
S200, arranging a crushing station in the ditching ditch at a preset distance from the ditching ditch working side;
in this embodiment, the crushing station 7 is a semi-fixed crushing station which is arranged on the open trench end. As shown in fig. 2, the predetermined distance between the crushing station 7 and the trenching working side 6 is Lp.
S300, arranging a first conveyor;
the first conveyor 8 is located below the discharge opening of the crushing station 7. In this embodiment, the first conveyor 8 is a large-inclination-angle belt conveyor, the tail part of the large-inclination-angle belt conveyor is arranged at the ditch bottom 4 of the ditching ditch 1, the head part is arranged on the ground surface on one side of the stope end slope 3, and the inclination angle of the first conveyor 8 is larger than 34 degrees.
S400, the mineral aggregate crushed by the crushing station is directly transported out of the stope through the first conveyor.
The first conveyor 8 conveys crushed mineral aggregate to the ground surface, and the ground surface is provided with a second conveyor 9, and the conveying direction of the second conveyor 9 is parallel to the stope working side.
The throughput of the crushing station 7 is smaller than the conveying capacity of the first conveyor 8, and the feed particle size of the crushing station 7 is smaller than the accept particle size of the first conveyor 8.
According to the strip mine exploitation and transportation method, the pit is fully dug through the earth surface covering on one side of the stope working side, which is close to the earth surface crushing station, the open section trench advanced in the advancing direction of the stope working side is formed, the first conveyor and the crushing station are arranged in the open section trench, crushed materials are directly transported out of the stope through the first conveyor, a truck is not required to walk along the end side step by step, the transportation distance can be greatly reduced, and the transportation efficiency is improved.
Further, S400, the mineral aggregate crushed by the crushing station is directly transported out of the stope via the first conveyor, and the steps include:
s320, arranging a discharging platform in the open section ditch;
the working side 6 of the open-section ditch is a combined step and is served by a mining device. The combined steps of the working sides 6 of the open-section ditch are respectively a first step and a second step which are respectively the Nth step of … …, and N is more than 2, and the combined steps are sequenced along the direction from the coal seam roof 5 to the ground surface.
In the present embodiment, the height of the first step corresponds to the height of the crushing station 7. The discharge platform 10 is arranged on an end upper flat plate of the second step. The width of the end upper flat disc of the second step is equal to the length L of the discharging platform x And the width B of the transport mineral aggregate channel.
S340, on the discharging platform, the mineral aggregate is discharged into the crushing station.
By arranging the discharging platform 10, the mineral aggregate can be conveniently discharged, the crushing efficiency is improved, and the transportation efficiency is further improved.
In one embodiment, the width of the open channel is W k Length L k ；
W k ＝2A+B+C+2D；
A is the vehicle turning radius, e.g., the radius required for a truck turn; b is the width of a mineral aggregate transporting channel; c is the width affected by the inclination angle of the first conveyor; d is the safe distance between the devices, typically 2.5m.
L k ＝1/2W x +2E+F+G+H+2A；
W x The width of the unloading platform is that E is the flat slope distance, and is generally 25m; f is the horizontal projection of a mineral aggregate transporting channel, G is the width of a stope work side blasting area 11 parallel to the advancing direction, and H is the distance between a crushing station and a stope work flat disc at the same horizontal height. H is influenced by the volume of stripped materials and the surplus volume of the internal dumping site when the section ditch 1 is dug.
Alternatively, the predetermined distance L p ＝0.5W x +2E+F+G+2A。
Further, the working flat plate of the working side of the ditching is B norm ，
B norm ＝H/cotα-B min (n-1)；
Wherein alpha is the final slope angle, B min The minimum working flat plate width is H, the total height of the working side of the ditching groove is H, and n is the number of the working flat plates.
The combination step refers to a set of adjacent steps that hold one working flat disc. And the final slope angle is an included angle between an imaginary inclined plane formed by connecting a slope top line of the uppermost working step and a slope bottom line of the lowermost working step and a horizontal plane. The minimum working flat disc width is typically 3-5 times its step height.
Optionally, the strip mine mining transportation method further comprises:
when the spacing between the crushing station and the stope working flat plate at the same level is D p *S g At the same time, the first conveyor and the crushing station are moved simultaneously.
Wherein D is p The time required for the crushing station to move once is d, S g The unit of the daily propulsion speed for the working highwall of the stope is m/d. And the coal mining carbon during the moving period is transported by a development transportation system established by the end walls of the internal dumping site and the stope. Time-shifting crushing station 7 and first conveyor 8Is the maximum value of (a).
In a specific embodiment, safety struts are arranged at two ends and the middle position of the conveying direction of the first conveyor 8, sliding rails corresponding to the safety struts one by one are arranged on stope end sides, and the first conveyor 8 slides on the sliding rails through the mounting struts, so that movement is realized, and movement efficiency is improved.
By moving the first conveyor 8 and the crushing station 7, the service is continued.
Preferably, for the formula F (L) =c/L- (Q) k +Q j ) L is derived to obtain an optimal solution, namely the moving setting step distance L of the crushing station 7, wherein L is less than or equal to V f /T 1 C is the cost of single movement of the crushing station, Q k For transportation cost, the unit is yuan/m; q (Q) j The transportation cost of the first conveyor is expressed as yuan/m; v (V) f The unit of the surplus soil discharging space of the inner soil discharging field is m 3 ；T 1 The unit of the excavation amount generated for each forward propulsion of the ditches is m 3 /m。
The foregoing has described in detail the technical solutions of the present application with reference to specific embodiments, which are described to help understand the ideas of the present application. Those skilled in the art will appreciate that many modifications and variations are possible in light of the above teachings.
Claims (8)
1. A method of strip mining and transportation, comprising:
performing full-head ditching on the ground surface covering on one side of the stope working side close to the ground surface crushing station to form a ditching section ditch advanced in the advancing direction of the stope working side;
a crushing station is arranged in the ditching ditch at a preset distance from the ditching ditch working side;
arranging a first conveyor, wherein the tail of the first conveyor is arranged at the bottom of a ditching section ditch, the head discharge opening of the first conveyor is positioned on the ground surface, and the first conveyor conveys crushed mineral aggregate to the ground surface;
mineral aggregate crushed by the crushing station is directly transported out of a stope through the first conveyor;
when the spacing between the crushing station and the stope working flat plate at the same level is D p *S g At the same time, the first conveyor and the crushing station are moved and arranged p The time required for the crushing station to move once S g The daily propulsion speed of the working side of the stope is increased;
the two ends and the middle position of the conveying direction of the first conveyor are respectively provided with a safety strut, the stope end sides are provided with sliding rails corresponding to the safety struts one by one, and the first conveyor is moved by sliding the mounting struts on the sliding rails;
for formula F (L) =c/L- (Q) k +Q j ) Obtaining an optimal solution as a moving step distance L of the crushing station, wherein L is less than or equal to V f /T 1 C is the cost of single movement of the crushing station, Q k For transportation cost, Q j For the first conveyor transportation cost, V f Is the surplus soil discharging space of the inner soil discharging field, T 1 The amount of dig generated for each forward propulsion of the trench segment of 1 m.
2. The strip mine mining transportation method of claim 1, wherein the ore material crushed by the crushing station is directly transported out of the stope via the first conveyor, comprising, before:
arranging a discharging platform in the open section ditch;
on the discharge platform, mineral aggregate is discharged into a crushing station.
3. The strip mining transportation method according to claim 2, wherein the width of the open-section trench is W k Length L k ；
W k ＝2A+B+C+2D；
A is the turning radius of the transport means; b is the width of a mineral aggregate transporting channel; c is the width affected by the inclination angle of the first conveyor; d is the safe distance between the devices;
L k ＝1/2W x +2E+F+G+H+2A；
W x for the width of the unloading platform, E is the flat slope distance, F is the horizontal projection of the mineral aggregate transporting channel, G is the stope working sideThe width of the blast zone parallel to the direction of advance, H is the spacing of the crushing station from the stope working pan at the same level as it.
4. The strip mining transportation method according to claim 3, wherein the predetermined distance L p ＝0.5W x +2E+F+G+2A。
5. The strip mining transportation method as claimed in claim 4, wherein the working platform of the trenching working side is B norm ，
B norm ＝H/cotα-B min (n-1)；
Wherein alpha is the final slope angle, B min The minimum working flat plate width is H, the total height of the working side of the ditching groove is H, and n is the number of the working flat plates.
6. The strip mine mining transportation method of claim 5, wherein a height of the first step of the open-section trench directly connected to the roof of the coal seam is equal to a height of the breaking station.
7. The strip mining transportation method of claim 6, wherein the discharge platform is located on a open-section trench end slope pan above the first step, the open-section trench end slope pan having a width equal to a sum of a discharge platform length and a transportation mineral aggregate channel width.
8. The strip mining transportation method of claim 7, wherein the first conveyor has an inclination angle greater than 34 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125205.4A CN112267886B (en) | 2020-10-20 | 2020-10-20 | Strip mine mining and transporting method |
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|---|---|---|---|
| CN202011125205.4A CN112267886B (en) | 2020-10-20 | 2020-10-20 | Strip mine mining and transporting method |
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| CN112267886A CN112267886A (en) | 2021-01-26 |
| CN112267886B true CN112267886B (en) | 2023-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418690A (en) * | 2008-11-21 | 2009-04-29 | 平朔煤炭工业公司 | Flat coal deposit large open pit mine end-slope transport technological process |
| CN103216237B (en) * | 2012-12-28 | 2015-11-18 | 中国神华能源股份有限公司 | A kind of Opencut coal mine mining technique |
| CN103470262A (en) * | 2013-09-12 | 2013-12-25 | 中国矿业大学 | Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping |
| CN106437720A (en) * | 2016-11-17 | 2017-02-22 | 中国矿业大学(北京) | Mining method |
| CN106869935B (en) * | 2017-04-21 | 2020-02-07 | 长沙有色冶金设计研究院有限公司 | Bidirectional trenching method for strip mine |
| CN108716402B (en) * | 2018-05-21 | 2019-11-05 | 中国矿业大学 | A kind of Semicontinuous Technology in Surface Coal Mines intermediate axle arrangement |
| CN109162716B (en) * | 2018-08-01 | 2020-02-07 | 包头钢铁（集团）有限责任公司 | Method for trenching open-pit mine |
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