CN113137234A - Open-pit coal mine pit bottom self-moving type inner dumping field lifting coal conveying system - Google Patents
Open-pit coal mine pit bottom self-moving type inner dumping field lifting coal conveying system Download PDFInfo
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- 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
Abstract
The invention discloses a pit bottom self-moving type inner dumping ground lifting coal conveying system for an open pit coal mine, which is suitable for a deep concave open pit coal mine adopting a single bucket excavator-automobile process inner dumping mining condition. The key technical problem that a belt conveyor is adopted for lifting and transporting coal out of a pit from the bottom of the pit is solved. The system is formed by connecting a plurality of cantilever type connecting bridges and a transfer conveyor in series, is obliquely arranged in an open-pit coal mine across steps, is connected with a coal face system from the bottom end to the bottom of a pit of the open-pit coal mine; the top end is connected with the ground belt conveyor system. The system can be arranged in a positive inclined way, a false inclined way, a staggered way and can also be temporarily adjusted in position and form according to the needs. When the inner soil discharge field is pushed forward or special needs are met, the system can be quickly moved and flexibly adjusted. Can be butted with a coal face belt conveyor; the coal crushing station removes a receiving bin and a plate feeder, does not lay a foundation and does not build a retaining wall. The method has the advantages of outstanding economic benefit and wide practical range, and has universal practical value for open-pit coal mines mined by inner rows.
Description
Technical Field
The invention relates to a pit bottom self-moving type inner dumping yard lifting and coal transporting system for an open pit coal mine, and belongs to the field of open pit mining technology.
Background
For a deep open pit coal mine, under the condition of adopting a single-bucket excavator-automobile process internal row mining, the coal is taken out of a pit from the bottom of the pit and transported in a climbing manner by adopting an automobile basically. Because the climbing ability of automobile transportation is little, cause that the distance to fortune is far away, the freight rate is high, economic effect is not good, still form alternately with peeling off the car when interior row moreover, cause the potential safety hazard.
Open pit is a short for open pit, and consists of a working side, a non-working side, two end sides and a pit bottom. And after the strip mine is internally discharged, the non-working side position becomes an internal soil discharge field. Open pit coal mining is the stripping (removal) of rock overlying a coal seam to mine the lower coal. In order to facilitate the operation of mining equipment, the working slope and the inner soil discharge field are divided into steps with different heights and flat discs with different widths one by one from the bottom of an open pit coal mine to the ground surface, and platforms with the minimum widths communicated with the working slope and the inner soil discharge field are reserved on the two side end slopes one by one according to slope stability conditions and inner vehicle transportation conditions.
With continuous extraction of coal in an open pit coal mine stope (stope), a working slope needs to be continuously pushed forward to be excavated and stripped so as to expose a new coal body and form a new open pit bottom of the open pit coal mine. Meanwhile, as the stripped objects excavated from the working slope are moved to an inner soil discharging yard to be discharged, the slope position of the inner soil discharging yard is dynamically pushed forward along with the working slope to form a new slope position; the end walls on the two sides and the bottom of the open pit coal mine are continuously buried. In the process of open pit coal mining, the working side, the inner soil discharge field, the two end sides and the pit bottom of the open pit coal mine are dynamically moved forwards and changed.
The working slope flat plate width and the inner earth discharge field flat plate width of the open pit coal mine can be increased or decreased at any time according to the mining production process, and are dynamically adjusted; the platform width of the end slope is reserved in the excavation process according to the slope stability condition and the inner row transportation condition, and can not be adjusted in the production process. In order to reduce the end slope coal pressing as much as possible and recover more coal resources, the width of the reserved end slope platform is narrow.
The belt conveyor coal conveying system arranged at the end slope part of the existing opencast coal mine has the following problems:
firstly, the platform width on the end slope needs to be occupied, so that extra supplementary slope expanding stripping amount is increased, the production stripping ratio of the open pit coal mine is increased, and the production cost is increased.
Secondly, potential safety hazards exist, the belt conveyor coal conveying system arranged on the end slope is arranged, and once the slope landslide is indicated, the adjustable range is small due to the narrow width of the platform on the end slope, so that the operation safety of the belt conveyor conveying system can be seriously threatened, and the production safety of an open pit coal mine is threatened.
And thirdly, after the open pit coal mine is discharged, the end slope is continuously buried, and a belt conveyor transportation system arranged on the end slope needs to be constantly and continuously moved. Due to the influence of the landslide threat of the end slope, the new position is difficult to select, the movement is difficult, the construction is difficult, and the maintenance is difficult.
And fourthly, in order to maintain the stability of the end slope, the bottom of the end slope of the belt conveyor transportation system is pressed, and the coal which is exposed is not dared to be extracted, so that the resource loss is caused.
And fifthly, because the inclination angle of the belt conveyor is not coupled with the slope angle and the shape of the side edge of the open pit coal mine, extra side cleaning amount needs to be increased.
And sixthly, after the belt conveyor transportation system is arranged at the end slope of the open pit coal mine, the transportation path of the inner row automobile is blocked, the inner row automobile cannot normally pass, and the inner row automobile needs to detour, so that the transportation distance is increased, the transportation cost is increased, and the like.
In summary, under the condition of drainage and mining in an opencast coal mine, the belt conveyor coal conveying system is arranged on the end slope, so that the side effects and the potential safety hazards are greater than the generated benefits, and the application is extremely few.
Disclosure of Invention
The invention provides a pit bottom self-moving type inner soil discharging field lifting coal conveying system for an open-pit coal mine, which is elevated, can move automatically, is arranged on a side slope of an inner soil discharging field of the open-pit coal mine, and can be quickly and flexibly adjusted and arranged along with the dynamic change of the side slope of a stope of the open-pit coal mine. The belt conveyor is adopted for the transportation of the coal of the open-pit coal mine with the internal row mining from the pit bottom out of the pit to climb, so that the transportation cost is reduced; the problem of potential safety hazards to a coal conveying system caused by the landslide of the end slope of the open pit coal mine is solved; the change of the shape of the end slope is not influenced, the coal is not pressed, and the coal resource is not lost; the supplementary expansion amount is not generated; the two side end walls of the opencast coal mine can be completely released, so that the inner row automobiles can freely pass through the two side end walls of the stope of the opencast coal mine according to the shortest path. The end slope at two sides of the open pit coal mine is arranged according to the minimum platform width, so that the occupied bandwidth of the end slope platform is reduced, and the coal pressing below the end slope is recovered more. The method has general practical value for open pit coal mines with large mining depth and internal drainage mining and automobile transportation. The economic benefit is outstanding. The pit bottom self-moving type inner dumping ground lifting coal conveying system for the open pit coal mine is suitable for all conditions of the deep concave inner dumping open pit coal mine.
The invention adopts the following technical scheme:
the invention relates to a pit bottom self-moving type inner dumping yard lifting and coal transporting system for an open pit coal mine, wherein a lifting and coal transporting system formed by connecting a plurality of cantilever type connecting bridges in series is obliquely arranged in the dumping yard of the open pit coal mine in a step-by-step manner, and the dumping yard in the open pit coal mine is reserved for switching, transferring and moving the plurality of cantilever type connecting bridges; the bottom end of a lifting coal conveying system formed by connecting a plurality of cantilever type connecting bridges in series is connected to the bottom of an open pit coal mine pit and is connected with a lowest horizontal coal face system in the pit; the top end of a lifting coal conveying system consisting of a plurality of cantilever type connecting bridges connected in series is connected to the ground surface and is connected with a ground belt conveyor system, and the coal is conveyed to the ground belt conveyor system; when the coal mining steps and the inner earth discharge field of the open pit coal mine are pushed forward for a certain distance, the cantilever type connecting bridge series system is switched and transferred to the reserved position.
The invention relates to a pit bottom self-moving type inner dumping ground lifting coal conveying system for an opencast coal mine, which is formed by mixing a plurality of cantilever type connecting bridges and a plurality of transfer conveyors and is arranged in an inner dumping ground of the opencast coal mine; reserving a dumping field in an opencast coal mine for switching and shifting a self-moving lifting coal conveying system; the plurality of cantilever type connecting bridges and the plurality of transfer conveyors are mixed to form a self-moving type lifting coal conveying system from the bottom end to the bottom of the open pit coal mine pit and are connected with a lowest horizontal coal face system in the pit; the top end of a self-moving type lifting coal conveying system formed by mixing a plurality of cantilever type connecting bridges and a plurality of reversed loaders is connected to the ground surface and connected with a ground belt conveyor system, and the coal is conveyed to the ground belt conveyor system; after the coal mining steps and the inner earth discharge field of the open pit coal mine are pushed forward for a certain distance, the plurality of cantilever type connecting bridges and the plurality of transfer conveyors are mixed to form a self-moving type lifting coal conveying system which is switched and transferred to the reserved position.
The invention adopts a series-connection lifting coal conveying system formed by mixing the cantilever type connecting bridge and the reversed loader, and the reversed loader can be arranged at the front end, the rear end or the middle part of the system according to the specific conditions of the opencast coal mine. The problem of because after opencut coal mine coal seam bottom plate height fluctuation and surface height fluctuation change, arouse that the most upper row of native step and the most lower row of native step height change, cause cantilever type connecting bridge to receive material height, unload the height change, and then arouse the connection with coal face system and ground belt conveyor system is solved.
The invention relates to a pit bottom self-moving type inner dumping yard lifting coal conveying system for an open pit coal mine. The truss extends out of the two ends, and the steel wire ropes are pulled obliquely. Each support consists of a bracket, a rotary platform and a travelling mechanism; the truss is erected on the two supporting brackets and is hinged with the brackets; the truss and the bracket can rotate up and down; the two supports, wherein one support can rotate around the other support; the two supports can be twisted relative to the truss; the operation position can be adjusted back and forth, left and right, and up and down.
According to the pit bottom self-moving type inner dumping ground lifting coal conveying system for the open pit coal mine, when the width of a dumping step flat disc of the inner dumping ground is large, the cantilever type connecting bridge and the transfer conveyor series system can be arranged in a positive inclination mode; when the width of the flat plate of the soil discharging step of the inner soil discharging field is narrow, a pseudo-inclined arrangement can be adopted.
The pit bottom self-moving type inner soil discharge field lifting coal transportation system for the open pit coal mine adopts the staggered arrangement when the soil quality of the inner soil discharge field of the open pit coal mine is soft, and the positive pressure transmitted by the coal transportation lifting system formed by connecting a plurality of cantilever type connecting bridges and the transfer conveyor in series is larger than the bearing capacity of the side slope soil rock in the arrangement area or the special requirement of the mining engineering is met. The arrangement position and form can also be adjusted temporarily.
The length of the middle bridge of the cantilever type connecting bridge and the length of the truss extending out of the two ends are determined by an image method according to parameters such as the height of an inner dumping site dumping step, the width of a dumping flat disc, the natural repose angle of materials, material engineering mechanical indexes and the like of different open mines. Two supports of the cantilever type connecting bridge are respectively arranged at different levels, and the arrangement inclination angle of the cantilever type connecting bridge is less than or equal to 18 degrees.
The pit bottom self-moving type inner dumping ground lifting coal conveying system for the open pit coal mine has the advantages that the height of a dumping step of the inner dumping ground is 20-30 m, the width of a flat plate of the dumping step of the inner dumping ground is 60-100 m, and the slope angle of a side wall of the inner dumping ground is 10-20 degrees.
According to the open-pit coal mine pit bottom self-moving type inner soil discharge field lifting and coal transporting system, the distance of forward movement of the open-pit coal mine pit bottom self-moving type inner soil discharge field lifting and coal transporting system is synchronous with the propelling distance of the working side, the distance of forward movement is 40-100 m each time, and the left and right switching distance is 80-150 m.
According to the pit bottom self-moving type inner dumping yard lifting coal conveying system for the open pit coal mine, the safe distance from the center of the cantilever type connecting bridge or the transfer conveyor to the dumping step slope top line is 30-50 m, and is greater than the requirement (four P238 in the open pit mining handbook) that the size of the dumping machine is 15-20 m, the operation safety is better than that of the dumping machine with the same weight scale, and the operation conditions are better than those of a bucket shovel expansion platform operation and a transfer shovel traveling operation. When the inner dumping ground area of the self-moving inner dumping ground lifting coal conveying system for laying the open pit coal mine has landslide, the operation position and the arrangement form of the system can be temporarily adjusted, so that the equipment system keeps a safe operation environment and is convenient to maintain and adjust.
The invention relates to a pit bottom self-moving type inner dumping field lifting coal conveying system for an open pit coal mine, wherein a lowest horizontal coal face system in the pit is a coal crushing station consisting of a scraper conveyor, a crusher and a connecting belt conveyor, the connecting belt conveyor is arranged below a discharge port of the crusher, and the connecting belt conveyor is butted with a cantilever type connecting bridge or a transfer conveyor. The crusher stands in isolation on a level ground at a distance from the step. The pile foundation can be pre-punched and poured and fixed by pre-embedded foundation bolts; the scraper conveyer is arranged perpendicular to the slope of the step, one end of the scraper conveyer is laid on the flat plate of the step, and the other end of the scraper conveyer is lapped on a receiving port of the crusher. The operation flow is as follows: the coal mined from the coal face of the working slope of the open pit coal mine is transported to a coal crushing station in the pit by an automobile, unloaded into a storage tank formed by a scraper conveyor, uniformly fed to a crusher by the scraper conveyor, crushed by the crusher, and then enters a lifting coal transporting system formed by connecting a plurality of cantilever type connecting bridges and a transfer conveyor in series through an interconnecting belt conveyor below the crusher, so that the coal is transported to a ground belt conveyor.
The invention relates to a pit bottom self-moving type inner dumping field lifting coal conveying system for an open-pit coal mine, wherein a lowest horizontal coal face system in a pit consists of a single-bucket excavator, a movable crushing station and a face belt conveyor, and the single-bucket excavator loads mineral aggregates into the movable crushing station; the movable crushing station conveys the crushed aggregates to a working face belt conveyor, and the working face belt conveyor is butted with a lifting coal conveying system formed by connecting the cantilever type connecting bridge and the transfer conveyor in series and lifted and conveyed to the ground belt conveyor system. The working face belt conveyor is divided into a left section and a right section so as to be converged to a lifting coal conveying system formed by serially connecting the cantilever type connecting bridge and the transfer conveyor.
The invention relates to a pit bottom self-moving type inner dumping field lifting coal conveying system for an open-pit coal mine, wherein a lowest horizontal coal face system in a pit consists of a bucket wheel excavator, a transfer conveyor and a face belt conveyor, and the face belt conveyor is butted with a lifting coal conveying system consisting of a cantilever type connecting bridge and the transfer conveyor in series and lifted and conveyed to a ground belt conveyor system. The working face belt conveyor is divided into a left section and a right section so as to be converged to a lifting coal conveying system formed by serially connecting the cantilever type connecting bridge and the transfer conveyor.
Advantageous effects
The open-pit coal mine pit bottom self-moving type internal dumping yard lifting coal conveying system has obvious economic benefit. Has wide application prospect. Has wide practicability.
The invention provides a pit bottom self-moving type inner dumping yard lifting coal conveying system for an open-pit coal mine, which is elevated, can move automatically, is arranged on a side slope of a dumping yard in the open-pit coal mine, can be adjusted and arranged quickly and flexibly along with the dynamic change of the side slope of a stope of the open-pit coal mine, and solves the problems of long conveying distance, high conveying expense and poor economic effect caused by small climbing capacity when a vehicle is adopted for conveying coal from a pit bottom to a pit and climbing.
The pit bottom self-moving type inner dumping ground lifting coal conveying system for the open-pit coal mine can realize the climbing transportation of the open-pit coal mine mined by inner dumping from the pit bottom by adopting a belt conveyor, thereby reducing the transportation cost; the end walls on the two sides of the open pit coal mine can be completely liberated, so that peeled inner-row automobiles can freely pass around the end walls, and the conveying distance of the inner-row automobiles is reduced to the maximum extent; the change of the shape of the end slope is not influenced, and the coal is not pressed; the supplementary expansion amount is not increased; the potential safety hazard problem that the end slope landslide caused the conveying system can be overcome. The economic effect is outstanding.
The pit bottom self-moving type inner dumping ground lifting coal conveying system for the open pit coal mine is flexible in arrangement, can flexibly adjust the operation position and the arrangement form according to the actual condition, and is good in safety. The method has general practical value for deep open pit coal mines with inner row mining and automobile transportation.
The pit bottom self-moving type inner dumping ground lifting coal conveying system for the open pit coal mine is suitable for all conditions of the deep concave inner dumping open pit coal mine.
Drawings
FIG. 1 is a schematic diagram of a positive inclination arrangement of a pit bottom self-moving type inner dumping ground lifting coal conveying system of an open pit coal mine.
FIG. 2 is a schematic diagram showing the state of the system after the working upper and the inner soil discharge field are pushed.
Fig. 3 is a schematic diagram of the system after position switching (cellular) transfer.
Fig. 4 is a schematic diagram of a pseudo-tilt arrangement of the system of the present invention.
FIG. 5 is a schematic diagram of the arrangement of the coal conveying system of the open pit coal mine under self-moving type inner dumping ground lifting.
Fig. 6 is a schematic layout of the coal lifting and transporting system of the mobile crushing station of the invention.
Fig. 7 is a schematic view of the serial connection of the cantilever type connecting bridges of the present invention.
Fig. 8 is a schematic view of the cantilever type connecting bridge structure of the present invention.
FIG. 9 is a schematic view of the coal crushing station arrangement of the present invention.
In the figure: 1-opencast coal mine working slope, 2-opencast coal mine inner soil discharge field, 3-opencast coal mine end slope, 4-opencast coal mine pit bottom, 5-automobile, 6-scraper conveyor, 7-crusher, 8-tie belt conveyor, 9-cantilever type connecting bridge, 9-1-cantilever type connecting bridge truss, 9-2-cantilever type connecting bridge bracket, 9-3-cantilever type connecting bridge traveling mechanism, 9-4-cantilever type connecting bridge rotary platform, 9-5-steel wire rope, 10-ground belt conveyor, 11-single bucket excavator, 12-mobile crushing station, 13-working face belt conveyor, 14-transfer machine.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1, fig. 2, fig. 3 and fig. 6, in the process of open pit coal mining, a lifting coal conveying system composed of a plurality of cantilever type connecting bridges 9 or transfer conveyors 14 which are connected in series is obliquely arranged across steps on an earth discharge field 2 in an open pit coal mine, and the bottom end of the lifting coal conveying system is connected to the pit bottom 4 of the open pit coal mine and is connected with a lowest horizontal coal face system in the pit; the top end is connected to the ground surface, and the coal is transported from the bottom 4 of the open pit coal mine → mined to a lifting coal transporting system consisting of a plurality of cantilever type connecting bridges 9 or transfer conveyors 14 which are connected in series → transported to a ground belt conveyor system 10; the stripped objects are discharged from the working side 1 of the open pit coal mine → the end sides 3 of the two sides → the inner dump site 2 by the inner dump truck 5. Free passage, short distance and low cost.
As shown in fig. 2 and fig. 3, when the coal mining steps and the inner soil discharge field of the open-pit coal mine are pushed forward for a certain distance, the lifting coal conveying system formed by serially connecting the cantilever type connecting bridges 9 or the transfer conveyors 14 is inverted (shifted) to the reserved position for transfer. So as to circularly reciprocate.
As shown in fig. 8, the cantilever type connecting bridge 9 is composed of a cantilever type connecting bridge truss 9-1 of the built-in belt conveyor and two supports. The truss extends out to two ends, and the steel wire ropes 9-5 are obliquely pulled. Each support of the two supports consists of a bracket 9-2, a rotary platform 9-4 and a travelling mechanism 9-3; the truss 9-1 is erected on the two supporting brackets 9-2 and is hinged with the brackets; the truss 9-1 and the bracket 9-2 can rotate up and down; the two supports, wherein one support can rotate around the other support; the two supports can be twisted relative to the truss 9-1; the operation position can be adjusted back and forth, left and right, and up and down. The cantilever type connecting bridge 9 arranged on the step of the inner dumping yard can pass through the dumping cars 5 under the armpit, and the running condition of the inner dumping cars is met.
The length of the middle bridge of the cantilever type connecting bridge 9 and the length of the truss extending out of the two ends are determined by an image method according to parameters such as the height of an inner dumping site dumping step, the width of a dumping flat disc, the natural repose angle of materials, material engineering mechanical indexes and the like of different open mines. Two supports of the cantilever type connecting bridge 9 are respectively arranged at different levels, and the arrangement inclination angle of the cantilever type connecting bridge 9 is less than or equal to 18 degrees.
As shown in fig. 1 and 4, when the width of the flat plate of the soil discharging step of the inner soil discharging field is large, the cantilever type connecting bridge 9 or the reversed loader 14 can be arranged in series in a positive inclination way; when the width of the flat plate of the soil discharging step of the inner soil discharging field 2 is narrow, the flat plate can be arranged in a pseudo-inclined mode. The arrangement position and form can also be adjusted temporarily. If the standing position shows landslide signs or other conditions, the equipment system can flexibly adjust the working position and the arrangement form.
As shown in fig. 5, when the soil quality of the soil discharge field in the open pit coal mine is soft, the positive pressure transmitted by the coal lifting and transporting system formed by connecting a plurality of cantilever type connecting bridges 9 or transfer conveyors 14 in series is intensively arranged to be larger than the bearing capacity of the side slope soil rock in the arrangement area, or when the special requirement of the mining engineering is met, the staggered arrangement is adopted.
By adopting the series-connection lifting coal conveying system formed by mixing the cantilever type connecting bridge 9 and the reversed loader 14, the reversed loader 14 can be arranged at the front end, the rear end or the middle part of the system according to the specific situation of the opencast coal mine.
After the arrangement of the lifting coal conveying system formed by serially connecting the cantilever type connecting bridges 9 or the transfer conveyors 14 is finished, the inner soil discharging steps on the two sides are further pushed forwards continuously to gradually form a clamping-shaped concave slope, so that the slope is more stable, as shown in fig. 2 and fig. 3.
Two supporting and traveling mechanisms of the cantilever type connecting bridge 9 are respectively arranged on the upper soil discharging step and the lower soil discharging step. The supporting travelling mechanism arranged on the upper soil discharging step plays a role in drawing the supporting travelling mechanism arranged on the lower soil discharging step; the supporting travelling mechanism arranged on the lower soil discharging step plays a role in supporting and supporting the supporting travelling mechanism arranged on the upper soil discharging step. The operation safety, stability and stress condition are better than those of a connecting bridge type wheel bucket excavator, a dumping machine, a reversed loader and the like under the same working condition. The system has low equipment cost.
As shown in fig. 1, coal extracted from the coal face of the working wall 1 of an open pit coal mine is transported to a coal crushing station in a pit through an automobile 5, discharged into a storage tank formed by a scraper conveyor 6, uniformly fed to a crusher 7 through the scraper conveyor, crushed by the crusher, enters a lifting coal transporting system formed by connecting a plurality of cantilever type connecting bridges 9 or transfer conveyors 14 in series through an interconnecting belt conveyor 8 below the crusher, and is transported to a ground belt conveyor system 10.
As shown in fig. 9, the in-pit lowest horizontal coal face system consists of a scraper conveyor 6, a crusher 7, a communication belt conveyor 8, the crusher 7 standing in isolation on a floor at a distance from the bench. The pile foundation can be pre-punched and poured and the foundation bolts can be pre-embedded for fixation. The scraper conveyor 6 is arranged perpendicular to the slope of the step, one end of the scraper conveyor is laid on the flat plate of the step, and the other end of the scraper conveyor is lapped on the receiving port of the crusher 7. And a connecting belt conveyor 8 is arranged below a discharge port of the crusher 7 and is in butt joint with a lifting coal conveying system formed by connecting cantilever type connecting bridges 9 or transfer conveyors 14 in series. The coal crushing station removes a receiving bin and a plate feeder, is additionally provided with a scraper conveyor, does not build a retaining wall or lay a foundation, adopts a crawler, an auxiliary slideway or a crane and the like to rapidly move, and can perform 24-hour in-place operation.
As shown in fig. 6, the lowest horizontal coal face system in the pit is composed of a single-bucket excavator 11, a mobile crushing station 12, a transfer conveyor 14 and a face belt conveyor 13, wherein the face belt conveyor is butted with a lifting coal conveying system composed of cantilever type connecting bridges 9 or transfer conveyors 14 in series, lifted and conveyed to a ground face belt conveyor system 10. The face belt conveyor 13 is divided into left and right sections so as to converge to a lifting coal conveying system composed of a cantilever type connecting bridge 9 or a transfer conveyor 14 connected in series.
The height of the soil discharging step of the inner soil discharging field 2 is 20 m-30 m, the width of the soil discharging step flat plate of the inner soil discharging field 2 is 60 m-100 m, and the slope angle of the side wall of the inner soil discharging field 2 is 10-20 degrees.
The distance of the self-moving inner dumping ground lifting coal conveying system at the bottom of the open pit coal mine is synchronous with the advancing distance of the working upper 1, the distance is 40-100 m when the coal conveying system moves forwards, and the distance is 80-150 m when the coal conveying system moves left and right.
The safe distance from the center of the cantilever type connecting bridge or the reversed loader to the slope top line of the dumping step is 30-50 m, which is greater than the requirement (four P238 in the open-pit mining handbook) of 15-20 m of the dumping machine with similar scale, the operation safety is better than that of the dumping machine with the same weight scale, and the operation safety is better than that of the bucket shovel extended platform operation and the operation condition when the adjusting shovel runs. When the slope slide is indicated in the area of the inner soil discharge field 2 for laying the open pit coal mine bottom self-moving inner soil discharge field lifting coal conveying system, the operation position and the arrangement form of the system can be temporarily adjusted, so that the equipment system keeps a safe operation environment and is convenient to maintain and adjust.
As shown in fig. 7, if the step height of the inner soil discharge field 2 is 30m, the width of the flat plate is 80m, the natural repose angle is 40 °, the slope angle of the inner soil discharge field is 15 °, the standing position is 30m away from the safe distance of the step top line, and when the cantilever type connecting bridges are in the condition of an underarm two-line passing soil discharging vehicle, the length of each cantilever type connecting bridge is 245 m, wherein: the length of the middle bridge is 120 m, the length of the left cantilever and the right cantilever is 30m + 95 m, and the arrangement inclination angle is 16 degrees. Each is lifted by 60m, and 4 cantilever type connecting bridges are lifted by 240 m.
If the cantilever type connecting bridge series system is arranged in the middle of an inner dumping site, and the cantilever type connecting bridge is used for single line passing dumping cars under the armpits, the safety distance between the standing position and the top line of the step can be increased to 50 m.
As shown in figure 3, when the width of the excavating belt of the open-pit coal mine is 80m, the inner dumping ground is propelled at equal intervals, and the annual pushing progress of the working slope is 400 m/a, the pit bottom self-moving inner dumping ground lifting coal conveying system of the open-pit coal mine needs to be switched (moved) for 5 times every year, and the switching (moving) distance is about 150 m each time.
When the width of a mining belt is 40 m, the inner dumping ground is propelled at equal intervals, and the annual pushing progress of a working slope is 400 m/a, the open-pit coal mine bottom self-moving inner dumping ground lifting coal conveying system needs to be switched (moved) 10 times every year, and the switching (moving) distance is about 80m each time.
Compared with automobile transportation, the belt conveyor transportation has the advantages of low unit operation cost, low energy consumption, low material consumption, low maintenance cost and low wage proportion, and the unit operation cost is generally 1/2-1/3 of an automobile; the equipment utilization rate is high, the system integrity rate of the belt conveyor reaches more than 98 percent, and the automobile availability rate is about 70 percent; the service time is long, the service time of the belt conveyor is about 25 years, and the service time of the automobile is about 12 years; the climbing capacity is large, the transportation climbing capacity of the belt conveyor is 16 degrees, and the transportation climbing capacity of the automobile is 5 degrees (when the slope is limited by 8 percent, the length of the moderate section is 80m, and the conversion gradient is only 3.2 degrees).
Because the automobile is heavy, about 60% of energy consumption is used for self weight. While the belt conveyor only consumes about 20% of the energy for self-weight transportation and 80% for material transportation. Therefore, under the condition of proper conditions, the belt conveyor is used for replacing automobile transportation, and the production cost is obviously saved. Especially, the economic effect of replacing automobile transportation by the belt conveyor is more obvious under the condition of deep level and long and large slope transportation.
AR26300X 95 type dumping theory capability 6300 m3(loose square), the length of the discharge arm is 95 m, the weight is 1142 t, and the external dimension (length multiplied by width multiplied by height: 166 multiplied by 22 multiplied by 42) ("open mining handbook" four P229); AR2Theoretical capacity 6500 m of 1800/(58 + 90) X27 type dumping device3H (loose square), a discharge arm length of 90 m and a weight of 1280 t (four P231 in the handbook of open-cast mining). The length of a connecting bridge of the Bagger series wheel bucket excavator is generally 120 m, the length of a bucket arm is 90 m, and the total length is 240 m. The cantilever length of the cantilever type dumping plough reaches more than 220 m (the handbook of open-pit mining, four P515). As the cantilever type connecting bridge in the open pit bottom self-moving type inner dumping field lifting coal conveying system of the invention has no lateral moment and no impact dynamic load,the balance mechanism is not arranged, the upper mechanism is not provided with a rotation driving device, an independent receiving and discharging mechanism is not arranged, and the receiving and discharging mechanisms are not provided with rotation functions. The weight is light like a dumping machine and a reversed loader with the same capacity and specification.
Black daidzein opencut coal mine, halwu opencut coal mine, baori schiler opencut coal mine, antiebao opencut coal mine, anjialing opencut coal mine, tenoto opencut coal mine, yimin river opencut coal mine, shenhua north electric opencut coal mine, opencut coal mine No. 1, opencut coal mine No. 2, opencut coal mine No. 3, opencut coal mine No. 4, south opencut coal mine, north opencut coal mine, zhahu tang opencut coal mine of holy new company, and quasi-east opencut coal mine, red sand spring open cut coal mine, black mountain opencut coal mine of xinjiang super new company, etc., south opencut coal mine of sinkiang sky pool energy company, opencut coal mine No. one, open cut coal mine No. two of general, etc. 30 million tons of large-scale and extra-large-scale opencut coal mine which are under internal drainage mining, coal mine reaches more than 7 hundred million tons, and the opencut coal mine is large in depth, coal is transported by automobiles from the pit bottom, and the coal is large in mining depth, long in transport distance, high in transport cost and poor in economic effect, and is crossed with stripping automobiles in the process of internal arrangement, so that potential safety hazards exist.
According to the unit operation cost (including fuel oil, tires, materials, maintenance, driver wages, excluding equipment depreciation, management cost and other indirect cost or allocation cost and the like) of transporting the automobile from the bottom 4 of the opencast coal mine to the ground by 200 m, 2 yuan/t km, the unit operation cost of the belt conveyor is 0.7 yuan/t km (coal crushing cost is not additional expenditure and is not considered), and the distance of transporting the automobile from the bottom 4 of the opencast coal mine to the ground is about 3.5 km (slope limit is 8 percent, and the length of the relaxation section is 80 m). The carrying distance of the system adopting the cantilever type connecting bridge is only about 1.0 km. The transportation cost per ton of coal can be saved by 6.3 yuan/t (3.5 multiplied by 2-1.0 multiplied by 0.7). The saving can be 12600 ten thousand yuan (2000 x 6.3) per year according to the coal production scale of 2000 million t/a.
The single bucket excavator-automobile process is adopted to transport coal from the bottom 4 of the open pit coal mine to the ground, and about 2 single bucket excavators and 24 automobiles are needed. The pit bottom 4 self-moving type coal lifting and transporting system for the open pit coal mine only needs 12 automobiles (each single-bucket excavator is provided with 6 automobiles), 12 automobiles can be reduced (namely, half of automobiles can be reduced), and the automobile purchase cost can be saved by 3.24 million yuan (12 multiplied by 2700).
Considering the belt width of a belt conveyor of the cantilever type connecting bridge is 1800 mm and the hourly conveying capacity is 10000 t/h, the weight of each belt conveyor is about 2000 t, and the weight of each belt conveyor is about 1000 t distributed to each supporting point. Each cantilever type connecting bridge costs about 1.2 million yuan, and a set of four cantilever type connecting bridges costs about 4.8 million yuan.
Therefore, the coal transporting system of the open pit coal mine bottom self-moving type inner dumping ground lifting is adopted to replace an automobile to transport coal from the open pit coal mine bottom 4 to the ground, the additional investment amount is about 1.56 billion yuan (4.8-3.24), and the additional investment recovery period is about 1 year (15600/12600).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. Open coal mine pit bottom self-moving type inner dumping field lifting coal conveying system, which is characterized in that: a lifting coal conveying system formed by connecting a plurality of cantilever type connecting bridges in series is obliquely arranged in an open pit coal mine across steps, and the plurality of cantilever type connecting bridges are reserved in the open pit coal mine for switching, transferring and shifting; the bottom end of a lifting coal conveying system formed by connecting a plurality of cantilever type connecting bridges in series is connected to the bottom of an open pit coal mine pit and is connected with a lowest horizontal coal face system in the pit; the top end of a lifting coal conveying system consisting of a plurality of cantilever type connecting bridges connected in series is connected to the ground surface and is connected with a ground belt conveyor system, and the coal is conveyed to the ground belt conveyor system; when the coal mining steps and the inner earth discharge field of the open pit coal mine are pushed forward for a certain distance, the cantilever type connecting bridge series system is switched and transferred to the reserved position.
2. Open coal mine pit bottom self-moving type inner dumping field lifting coal conveying system, which is characterized in that: a self-moving type lifting coal conveying system formed by mixing a plurality of cantilever type connecting bridges and a plurality of transfer conveyors is arranged in an earth discharge field in an opencast coal mine; reserving a dumping field in an opencast coal mine for switching and shifting a self-moving lifting coal conveying system; the plurality of cantilever type connecting bridges and the plurality of transfer conveyors are mixed to form a self-moving type lifting coal conveying system from the bottom end to the bottom of the open pit coal mine pit and are connected with a lowest horizontal coal face system in the pit; the top end of a self-moving type lifting coal conveying system formed by mixing a plurality of cantilever type connecting bridges and a plurality of reversed loaders is connected to the ground surface and connected with a ground belt conveyor system, and the coal is conveyed to the ground belt conveyor system; after the coal mining steps and the inner earth discharge field of the open pit coal mine are pushed forward for a certain distance, the plurality of cantilever type connecting bridges and the plurality of transfer conveyors are mixed to form a self-moving type lifting coal conveying system which is switched and transferred to the reserved position.
3. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the cantilever type connecting bridge consists of a truss with a built-in belt conveyor and two supports; the truss extends out of the two ends and is fixed with the two supports by adopting the inclined pulling of a steel wire rope;
each support consists of a bracket, a rotary platform and a travelling mechanism; the truss is erected on the two supporting brackets and is hinged with the brackets; the truss and the bracket can rotate up and down; one of the two supports can rotate around the other support; the two supports are twistable relative to the truss; the cantilever type connecting bridge can adjust the operation position forwards, backwards, leftwards, rightwards, upwards and downwards.
4. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: when the width of the flat plate of the soil discharging step of the inner soil discharging field is large, a lifting coal conveying system formed by connecting a plurality of cantilever type connecting bridges and a transfer conveyor in series is arranged in a positive inclination manner; when the width of the flat plate of the soil discharging step of the inner soil discharging field is narrow, a lifting coal conveying system formed by connecting a plurality of cantilever type connecting bridges and a transfer conveyor in series is arranged in a pseudo-inclined manner;
the dumping field in the opencast coal mine is soft soil or the bearing capacity of the dumping field in the opencast coal mine in the area is smaller than the positive pressure transmitted by the coal lifting and transporting system, and the lifting and transporting system formed by connecting the cantilever type connecting bridges and the reversed loader in series is arranged in a staggered manner.
5. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the height of the soil discharging step of the inner soil discharging field is 20 m-30 m, the width of the soil discharging step flat disc of the inner soil discharging field is 60 m-100 m, and the slope angle of the side wall of the inner soil discharging field is 10-20 degrees; the distance of the self-moving inner dumping ground lifting coal conveying system of the open pit bottom of the open pit coal mine is synchronous with the propelling distance of the working upper, the distance of the self-moving inner dumping ground lifting coal conveying system is 40-100 m when the self-moving inner dumping ground lifting coal conveying system moves forwards, and the left and right switching distance is 80-150 m.
6. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the safe distance from the center of the cantilever type connecting bridge or the reversed loader to the top line of the dumping step is 30-50 m.
7. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the lowest horizontal coal face system in the pit comprises a coal crushing station consisting of a scraper conveyor, a crusher and a connecting belt conveyor, wherein the connecting belt conveyor is arranged below a discharge port of the crusher and is in butt joint with a lifting coal conveying system consisting of a cantilever type connecting bridge and a transfer conveyor in series.
8. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the lowest horizontal coal face system in the pit consists of a single-bucket excavator, a movable crushing station and a working face belt conveyor, wherein the working face belt conveyor is butted with a lifting coal conveying system consisting of a cantilever type connecting bridge and a transfer conveyor in series and lifted and conveyed to a ground belt conveyor system.
9. The open pit coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1 or 2, wherein: the lowest horizontal coal face system in the pit consists of a bucket excavator, a transfer conveyor and a face belt conveyor, wherein the face belt conveyor is butted with a lifting coal conveying system formed by connecting a cantilever type connecting bridge and the transfer conveyor in series and lifted and conveyed to a ground belt conveyor system.
10. The opencut coal mine pit bottom self-propelled inner dump lifting coal conveying system of claim 1, wherein: two supports of the cantilever type connecting bridge are respectively arranged at different levels, and the arrangement inclination angle of the cantilever type connecting bridge is less than or equal to 18 degrees.
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