CN201950031U - Separating device for down-hole spoil - Google Patents
Separating device for down-hole spoil Download PDFInfo
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- CN201950031U CN201950031U CN2010205750919U CN201020575091U CN201950031U CN 201950031 U CN201950031 U CN 201950031U CN 2010205750919 U CN2010205750919 U CN 2010205750919U CN 201020575091 U CN201020575091 U CN 201020575091U CN 201950031 U CN201950031 U CN 201950031U
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- 239000003245 coal Substances 0.000 claims abstract description 204
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- 230000003116 impacting effect Effects 0.000 claims description 47
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- 229910052790 beryllium Inorganic materials 0.000 claims description 11
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 11
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Abstract
The utility model provides a separating device for down-hole spoils, which comprises a first belt conveyor and a second belt conveyor. The first belt conveyor is used for conveying run-of-mine coal and the second belt conveyor is used for conveying the coal wherein most spoils are removed from the run-of-mine coal. The material outlet of the first belt conveyor is higher than the conveyer belt of the second belt conveyor in the vertical direction. By utilizing the difference of the physical properties between coal and spoils, such as the hardness thereof, the run-of-mine coal is bumped with rotary run-of-mine coal bumping bodies between the material outlet of the first belt conveyor and the conveyer belt of the second belt conveyor, so that the speeds of the coal and the spoils are different from each other in the horizontal direction. Therefore, the coal and the spoils are separated from each other based on the different ejection distances thereof. The separating device for down-hole spoils has the advantages of simple structure, safe and reliable operation, small occupation space and easy down-hole implementation. Meanwhile, the mine ineffective transportation is obviously reduced and the in-site backfill of down-hole spoils is realized.
Description
Technical field
The utility model relates to a kind of downhole gangue separator, particularly directly separates the device of coal and spoil under coal mine.
Background technology
Along with improving constantly of mining mechanization degree, particularly the top coal caving broad application makes in the coal mining process and sneaks into coal stream by a large amount of spoils of generations such as working face tomography, roof and floor and dirt band.According to incompletely statistics, promote the middle percentage of shale content of the run-of-mine coal (ROM coal) (without the coal of any processing, mainly being coal and spoil after the extraction) that enters ground coal preparation plant from the down-hole on average about 16%.
In the coal industry traditional work, all will mine with coal separation be divided into two independently systems.The colliery does not deal with the spoil of sneaking in the coal in the down-hole, but directly transports, is promoted to ground together, is got rid of by washing by coal preparation plant again.Its weak point has: the transportation of spoil and a large amount of energy of lifting waste; Increase the electromechanical equipment loss and the energy consumption of ground coal preparation plant; The isolated spoil of coal preparation plant takies a large amount of soils; Spoil pollutes the soil and the water source of surrounding area; Mining area depression etc.
Therefore, coal preparation technology and equipment under the development coal mine are got rid of spoil on the spot in the down-hole, especially get rid of the bulk spoil, can produce remarkable economic efficiency and social benefit, are embodied in:
(1) can avoid a large amount of invalid transportations, improve the actual production capacity of mine, realize " energy-saving and emission-reduction ".With sneak into spoil in the run-of-mine coal (ROM coal) by down-hole transportation, be promoted to ground coal preparation plant and process invalid transportation again; If can get rid of on the spot in the down-hole, then the capacity that was used to transport, promote spoil originally can be converted into the fortune coal, not only can improve the practical capacity of mine transportation, also played the effect of " energy-saving and emission-reduction " simultaneously.
(2) the electromechanical equipment loss and the energy consumption of reduction ground coal preparation plant.Lock out operation, the especially processing of bulk spoil of a large amount of spoils can cause bigger mechanical loss to the electromechanical equipment of coal preparation plant, have also increased the energy consumption of electromechanical equipment simultaneously.The separation on the spot of downhole gangue can significantly reduce the electromechanical equipment loss and the energy consumption of ground coal preparation plant.
(3) save the area, preserve the ecological environment.The spoil that ground coal preparation plant is got rid of need take a large amount of places and carry out accumulation deposit, after the spoil weathering, meets wind and then stirs up a cloud of dust, and meets then sewage crossing current of rain, and the sulphur content in the spoil and combustible very easily form spontaneous combustion, has more increased the weight of the infringement to ecological environment.Get rid of spoil in the down-hole on the spot by sorting, then can eliminate these drawbacks.
(4) the spoil backfill on the spot of down-hole separation.The spoil (especially bulk spoil) that the down-hole is got rid of on the spot can effectively be avoided subsiding of ground, mining area as adopting empty backfilling material; After technical finesse, the coal in the unrenewable safety pillar of replaceable conventional art, the purpose that realize improving the coal recovery ratio, prolongs mine service-life.
Summary of the invention
The utility model technical problem at first to be solved provides a kind of downhole gangue separator, and it is simple and practical and be easy to the down-hole and implement.For this reason, the utility model is by the following technical solutions: it comprises first ribbon conveyer and second ribbon conveyer, described first ribbon conveyer is carried run-of-mine coal (ROM coal), described second ribbon conveyer is carried the coal behind the most of spoil of eliminating from run-of-mine coal (ROM coal), the material outlet of described first ribbon conveyer is higher than the conveyer belt of described second ribbon conveyer in vertical direction, between the conveyer belt of the material outlet of described first ribbon conveyer and described second ribbon conveyer, also be provided with the run-of-mine coal (ROM coal) impacting body of rotation, the rotating shaft level of described run-of-mine coal (ROM coal) impacting body and perpendicular to the throughput direction of first ribbon conveyer.
Device provided by the utility model utilizes coal and spoil to distinguish in the difference aspect the physical propertys such as hardness, and making most of spoil (especially bulk spoil) is separated going out in the down-hole.
Because coal (especially lumped coal) quality is loose, is easy to fragmentation, so elasticity is less, coal Powdered destruction occurs or integral body is broken into a plurality of fritters at rum point easily after being clashed into.In this destructive process, most of energy that bump produces is absorbed, so the coal after being clashed into does not have too big kinetic energy usually, it is less to show as movement velocity.
Spoil is then different.Spoil (especially block spoil) quality densification is hard, is difficult to fragmentation, so the energy that produces when being subjected to clashing into can not in time discharge, the spoil after being clashed into has bigger kinetic energy usually, thereby makes spoil often have the movement velocity bigger than coal.
The utility model realizes that based on above-mentioned principle waste shaft separates down: by the run-of-mine coal (ROM coal) that bump falls from the top, make coal near the direction of level, produce different speed with spoil, and then according to effectively separating apart from difference of ejecting.
On the basis of adopting technique scheme, the utility model also can adopt following further technical scheme simultaneously:
Ejection direction that spoil is clashed into by the run-of-mine coal (ROM coal) impacting body tiltedly below be provided with the spoil collection container; Clashed into by the run-of-mine coal (ROM coal) impacting body and the direction that falls is provided with the coal guide plate that material is imported the conveyer belt of second ribbon conveyer at coal.
The top of described spoil collection container is provided with towards the spillplate run-of-mine coal (ROM coal) impacting body, rotating, and described spillplate can constitute around the baffle plate bar of turning cylinder independent rotation by many; The top of described spillplate is provided with spray header; Described spillplate is in the top of described coal guide plate, and described spillplate and described coal guide plate have material to import matching relationship.
Described baffle plate bar is towards the one side of run-of-mine coal (ROM coal) impacting body, has to contain chromium or contain beryllium or contain the superficial layer of chromium and beryllium simultaneously.
The main body of described run-of-mine coal (ROM coal) impacting body is a cylinder, and its surface has axial bump bar, and the top of described run-of-mine coal (ROM coal) impacting body is provided with spray header.
The surface of described bump bar has and contains chromium or contain beryllium or contain the superficial layer of chromium and beryllium simultaneously.
Owing to adopt the technical solution of the utility model, can utilize said apparatus, run-of-mine coal (ROM coal) impacting body by rotation clashes into the run-of-mine coal (ROM coal) that falls from the top, makes coal and spoil obtain different horizontal velocity component, and then according to the difference of drop point coal is separated with most of spoil; Further, can also in separation process, directly the coal transhipment be carried, spoil is collected in separation process automatically.Further, the spillplate be furnished with of spoil collection container only could be opened during greater than critical value in suffered external force; When spoil clashed into spillplate with bigger kinetic energy and speed, spillplate was opened greater than critical value because of suffered external force, and spoil is fallen into the spoil collection container; For the coal of a small amount of bullet to spoil collection container top, because its kinetic energy and speed are less than normal, to the impact of spillplate less than critical value, be not enough to spillplate is rushed open, thereby make it on the conveyer belt of coal guide plate landing to the second conveyer, further improve separating effect, reduce the loss of coal resources.
Description of drawings
Fig. 1 is the schematic diagram of downhole gangue separator embodiment of the present utility model.
Fig. 2 is the structural representation of spillplate.
Number in the figure is expressed as follows respectively: 1, run-of-mine coal (ROM coal) impacting body, 2, the bump bar on run-of-mine coal (ROM coal) impacting body surface, 3, the rotating shaft of run-of-mine coal (ROM coal) impacting body, 4, spillplate, 5, spoil collection container, 6, coal guide plate, 7, the spray header of run-of-mine coal (ROM coal) impacting body top, 8, the spray header of spillplate top, 9, the conveyer belt of first ribbon conveyer, the material outlet of 10, first ribbon conveyer, the conveyer belt of 11, second ribbon conveyer, 12, baffle plate bar, 13, spring, 14, be equipped with the turning cylinder of resilience damper, 100, run-of-mine coal (ROM coal), 101, coal, 102, spoil.
The specific embodiment
As shown in Figure 1, the utility model comprises first ribbon conveyer and second ribbon conveyer; The conveyer belt 9 of first ribbon conveyer is carried run-of-mine coal (ROM coal) 100, the conveyer belt 11 of second ribbon conveyer is carried the coal 101 behind the most of spoil of eliminating from run-of-mine coal (ROM coal), the material outlet 10 of first ribbon conveyer is higher than the conveyer belt 11 of second ribbon conveyer in vertical direction, between the conveyer belt 11 of the material outlet 10 of first ribbon conveyer and second ribbon conveyer, also be provided with the run-of-mine coal (ROM coal) impacting body 1 of rotation, rotating shaft 3 levels of described run-of-mine coal (ROM coal) impacting body and perpendicular to the throughput direction of the conveyer belt 9 of first ribbon conveyer.
The top of spoil collection container 5 be provided with towards run-of-mine coal (ROM coal) impacting body 1, that tilt, spring-supported spillplate 4 arranged; Spillplate 4 is in the oblique upper of coal guide plate 6, and spillplate 4 has material to import matching relationship with coal guide plate 6.
As shown in Figure 2, spillplate 4 is by constituting around many baffle plate bars 12 of turning cylinder 14 independent rotation that are equipped with the resilience damper; Every baffle plate bar 12 is supported by separately spring 13 respectively.
The main run-of-mine coal (ROM coal) of forming by coal 101 and spoil 102 100, conveying through the conveyer belt 9 of first ribbon conveyer, arrive material outlet 10 places of first ribbon conveyer, above run-of-mine coal (ROM coal) impacting body 1, fall, and be subjected to the bump of run-of-mine coal (ROM coal) impacting body 1, coal 101 in the run-of-mine coal (ROM coal) obtains different horizontal velocity component with spoil 102, and as previously mentioned, spoil 102 often flies fartherly than coal 101.Spoil collection container 5 is arranged on the position more farther than the drop point of most of coals 101; Spoil collection container 5 is furnished with spillplate 4, and spillplate 4 could be opened greater than by the critical value of spring 13 decision the time in suffered external force; When spoil 102 clashed into spillplate 4 with bigger kinetic energy and speed, spillplate 4 was opened greater than critical value because of suffered external force, and spoil 102 is fallen into spoil collection container 5; For the coal 101 of a small amount of bullet,, the impact of spillplate 4 less than critical value, is not enough to spillplate 4 is rushed open, thereby makes above-mentioned coal 101 along spillplate 4 landings because its kinetic energy and speed are less than normal to spoil collection container 5 tops.Above-mentioned coal 101 does not have the coal 101 of bullet to spoil collection container 5 tops with other great majority, is slipped to through coal guide plate 6 on the conveyer belt 11 of second ribbon conveyer.
In order to explain above-mentioned embodiment more fully, below with regard to two capital equipments of downhole gangue separator: run-of-mine coal (ROM coal) impacting body 1 and spillplate 4 are described further.
1, run-of-mine coal (ROM coal) impacting body
As shown in Figure 1, the agent structure of run-of-mine coal (ROM coal) impacting body 1 can adopt the solid cylinder formed steel construction, makes run-of-mine coal (ROM coal) impacting body 1 have bigger quality, and then kinetic energy and inertia when increasing 1 rotation of run-of-mine coal (ROM coal) impacting body.Because coal 101 and spoil 102 fall continuously, for making all coals 101 or spoil 102 as far as possible can both effectively bump take place with run-of-mine coal (ROM coal) impacting body 1, have axial bump bar 2 at the outer surface of run-of-mine coal (ROM coal) impacting body 1.Above-mentioned bump bar 2 can be made of the bigger alloy steel products (as manganese steel) of solid steel or intensity, at the outer surface of run-of-mine coal (ROM coal) impacting body 1 fixedly the time, with rotating shaft 3 keeping parallelisms of run-of-mine coal (ROM coal) impacting body 1.Above-mentioned outer surface is fixed with bump bar 2, the similar lotiform run-of-mine coal (ROM coal) impacting body 1 in cross section, with suitable rotating speed rotation, can make most coals 101 or spoil 102 and run-of-mine coal (ROM coal) impacting body 1 that effectively bump takes place, and near the direction of level, obtain different movement velocitys.The rotating speed of run-of-mine coal (ROM coal) impacting body 1 can be regulated, and can determine optimum speed by test at different operating modes, makes coal 101, spoil 102 and the effectively difference maximization of bump back catapulting distance of run-of-mine coal (ROM coal) impacting body 1.
It is accidents caused to produce spark when avoiding run-of-mine coal (ROM coal) 100 with run-of-mine coal (ROM coal) impacting body 1 bump, taked following measure in the utility model: (1) is provided with spray header 7 above the run-of-mine coal (ROM coal) impacting body, run-of-mine coal (ROM coal) impacting body 1 and near run-of-mine coal (ROM coal) thereof are all within the spray scope, so both can suppress and extinguish spark, can effectively reduce the dust that the bump back produces again, when eliminating accident potential, improve the downhole production environment.(2) the bump bar 2 to run-of-mine coal (ROM coal) impacting body surface carries out surface treatment, makes it have the superficial layer that contains chromium or contain beryllium or contain chromium and beryllium simultaneously; Chromium and beryllium belong to active less metal, can effectively reduce the generation of spark and the kindling of reduction spark; Above-mentioned measure does not influence the intensity of described bump bar 2, can guarantee the production safety of separation process under the waste shaft simultaneously.
2, spillplate
The structural representation of spillplate 4 as shown in Figure 2.Spillplate 4 is made of many baffle plate bars 12, and baffle plate bar 12 can be made of steel plate, and each baffle plate bar 12 can center on turning cylinder 14 independent rotation that are equipped with the resilience damper, and is furnished with support spring 13 separately.Be not subjected to other external force to do the time spent, under the elastic force effect of spring 13, every baffle plate bar all is still in as the position among Fig. 1.Select the proper strength of spring 13, make to launch to the spoil 102 of spoil collection container 5 tops and can rush open corresponding baffle plate bar 12 and enter spoil collection container 5, the resilience damper that is equipped with by turning cylinder 14 simultaneously, make this baffle plate bar 12 return initial resting position, avoid because the quick bounce-back of spring 13 and spoil 102 is bounce back into the outside of spoil collection container 5 with appropriate speed.Rush open the synchronization of certain bar baffle plate bar 12 at spoil 102, may also have a small amount of coal 101 other adjacent screen bars of bump, can not rush open the baffle plate bar because kinetic energy and speed are less than normal, above-mentioned coal 101, and is finally fallen on the conveyer belt 11 of second ribbon conveyer to coal guide plate 6 along the landing of baffle plate bar.Though the spillplate 4 of said structure may cause part kinetic energy fritter spoil less than normal can not enter spoil collection container 5, but can guarantee especially bulk spoil of most of spoil 102() enter spoil collection container 5 smoothly, and stop that effectively coal 101 is strayed into spoil collection container 5, thereby in the process of getting rid of spoil 102, reduce the loss of coal resources to greatest extent.
Simultaneously for guaranteeing the production safety of spoil separation process, the danger of avoiding spoil 102 or coal 101 when bump spillplate 4, to produce spark, the utility model has been taked the safety measure similar to run-of-mine coal (ROM coal) impacting body 1: (1) is provided with spray header 8 above spillplate 4, all baffle plate bars 12 are sprayed, suppress also in time to extinguish spark, reduce the dust that the bump back produces; (2) all baffle plate bars 12 are carried out surface treatment, make the one side of each baffle plate bar 12, have and contain chromium or contain beryllium or contain the superficial layer of chromium and beryllium simultaneously towards run-of-mine coal (ROM coal) impacting body 1.
The design of above-mentioned spillplate 4 only is a preferred embodiment, also can take following scheme during concrete enforcement: spillplate 4 need not to be equipped with spring 13 or resilience damper etc., when initial inactive state, be in vertical direction, by increasing quality to a suitable critical value of baffle plate bar 12, baffle plate bar 12 can be rushed open and can not be rushed open by coal 101 by sudden spoil 102, and the baffle plate bar 12 that is rushed open relies on himself gravity subsequently and rotates and get back to initial vertical state around turning cylinder.
In addition, related first ribbon conveyer and second ribbon conveyer in the above-mentioned specific embodiment of the utility model, be preferred embodiment only, when specifically implementing discontinuous formulas such as first ribbon conveyer, the also replaceable one-tenth coal bunker funnel of second ribbon conveyer or wagon box, batch conveying device.
Simultaneously, related spoil collection container in the above-mentioned specific embodiment of the utility model, be preferred embodiment only also, when specifically implementing the spoil collection container also replaceable for continous way conveying device such as ribbon conveyer the spoil of separating is collected continuously and directly transhipment carry.
The above-mentioned specific embodiment is used for the utility model of explaining; it only is preferred embodiment of the present utility model; rather than the utility model limited; in the protection domain of spirit of the present utility model and claim; any modification that the utility model is made, be equal to replacement, improvement etc., all fall into protection domain of the present utility model.
Claims (6)
1. downhole gangue separator, it is characterized in that it comprises first ribbon conveyer and second ribbon conveyer, described first ribbon conveyer is carried run-of-mine coal (ROM coal), described second ribbon conveyer is carried the coal behind the most of spoil of eliminating from run-of-mine coal (ROM coal), the material outlet of described first ribbon conveyer is higher than the conveyer belt of described second ribbon conveyer in vertical direction, between the conveyer belt of the material outlet of described first ribbon conveyer and described second ribbon conveyer, also be provided with the run-of-mine coal (ROM coal) impacting body of rotation, the rotating shaft level of described run-of-mine coal (ROM coal) impacting body and perpendicular to the throughput direction of first ribbon conveyer.
2. downhole gangue separator as claimed in claim 1, it is characterized in that ejection direction that spoil is clashed into by the run-of-mine coal (ROM coal) impacting body tiltedly below be provided with the spoil collection container; Clashed into by the run-of-mine coal (ROM coal) impacting body and the direction that falls is provided with the coal guide plate that material is imported the conveyer belt of second ribbon conveyer at coal.
3. downhole gangue separator as claimed in claim 1 or 2 is characterized in that the top of described spoil collection container is provided with towards the spillplate run-of-mine coal (ROM coal) impacting body, rotating, and described spillplate can constitute around the baffle plate bar of turning cylinder independent rotation by many; The top of described spillplate is provided with spray header; Described spillplate is in the top of described coal guide plate, and described spillplate and described coal guide plate have material to import matching relationship.
4. downhole gangue separator as claimed in claim 3 is characterized in that the one side of described baffle plate bar towards the run-of-mine coal (ROM coal) impacting body, has the superficial layer that contains chromium or contain beryllium.
5. downhole gangue separator as claimed in claim 1, the main body that it is characterized in that described run-of-mine coal (ROM coal) impacting body is a cylinder, and its surface has axial bump bar, and the top of described run-of-mine coal (ROM coal) impacting body is provided with spray header.
6. downhole gangue separator as claimed in claim 5 is characterized in that the surface of described bump bar has the superficial layer that contains chromium or contain beryllium.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750919U CN201950031U (en) | 2010-10-25 | 2010-10-25 | Separating device for down-hole spoil |
| PCT/CN2011/074260 WO2012055233A1 (en) | 2010-10-25 | 2011-05-18 | Method and device for separating gangue under well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750919U CN201950031U (en) | 2010-10-25 | 2010-10-25 | Separating device for down-hole spoil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201950031U true CN201950031U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205750919U Expired - Fee Related CN201950031U (en) | 2010-10-25 | 2010-10-25 | Separating device for down-hole spoil |
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| Country | Link |
|---|---|
| CN (1) | CN201950031U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979832A (en) * | 2010-10-25 | 2011-02-23 | 浙江大学 | Underground separation method and device for gangue |
| CN102658265A (en) * | 2012-04-27 | 2012-09-12 | 王向华 | Method and device for separating stone impurities from tuber crops |
| CN103909063A (en) * | 2014-03-20 | 2014-07-09 | 江西稀有稀土金属钨业集团有限公司 | Ore separating device for waste and gangue ore bins of inclined shaft |
| CN106493081A (en) * | 2016-11-29 | 2017-03-15 | 浙江优嘿嘿食品有限公司 | Pusher gear collected by a kind of food |
| CN111054635A (en) * | 2019-11-12 | 2020-04-24 | 河北玖河精密机械制造有限公司 | JHDDS intelligent gangue selecting method and device |
| CN112827835A (en) * | 2021-01-04 | 2021-05-25 | 太原理工大学 | Method and device for separating coal and gangue by using inclined belt conveyor underground |
| CN112845101A (en) * | 2021-01-04 | 2021-05-28 | 太原理工大学 | Method and device for separating coal and gangue by using high-speed belt conveyor underground |
| CN113457989A (en) * | 2021-07-02 | 2021-10-01 | 安徽理工大学 | Intelligent coal gangue dry separation device based on friction coefficient difference and separation method thereof |
-
2010
- 2010-10-25 CN CN2010205750919U patent/CN201950031U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979832A (en) * | 2010-10-25 | 2011-02-23 | 浙江大学 | Underground separation method and device for gangue |
| CN102658265A (en) * | 2012-04-27 | 2012-09-12 | 王向华 | Method and device for separating stone impurities from tuber crops |
| CN103909063A (en) * | 2014-03-20 | 2014-07-09 | 江西稀有稀土金属钨业集团有限公司 | Ore separating device for waste and gangue ore bins of inclined shaft |
| CN106493081A (en) * | 2016-11-29 | 2017-03-15 | 浙江优嘿嘿食品有限公司 | Pusher gear collected by a kind of food |
| CN111054635A (en) * | 2019-11-12 | 2020-04-24 | 河北玖河精密机械制造有限公司 | JHDDS intelligent gangue selecting method and device |
| CN112827835A (en) * | 2021-01-04 | 2021-05-25 | 太原理工大学 | Method and device for separating coal and gangue by using inclined belt conveyor underground |
| CN112845101A (en) * | 2021-01-04 | 2021-05-28 | 太原理工大学 | Method and device for separating coal and gangue by using high-speed belt conveyor underground |
| CN112845101B (en) * | 2021-01-04 | 2022-07-29 | 太原理工大学 | Method and device for separating coal and gangue by using high-speed belt conveyor underground |
| CN113457989A (en) * | 2021-07-02 | 2021-10-01 | 安徽理工大学 | Intelligent coal gangue dry separation device based on friction coefficient difference and separation method thereof |
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