CN220941187U - Bulk raw coal sorting system with high middling content - Google Patents

Abstract

The utility model provides a large-block raw coal sorting system with high middling content, which comprises a raw coal belt conveyor, a raw coal double-layer classifying screen and a movable sieve jigger, wherein the raw coal double-layer classifying screen is provided with a large-block raw coal discharge port, a mixed middling raw coal discharge port and a non-raw coal discharge port, the large-block raw coal discharge port is connected with the movable sieve jigger, the movable sieve jigger is provided with a large-block clean coal discharge port, a large-block middling coal discharge port and a large-block gangue discharge port, the large-block middling coal discharge port is connected with a large-block middling crusher, the large-block middling crusher is respectively connected with the non-raw coal belt conveyor and a scraper conveyor through a three-way chute, the large-block clean coal discharge port is connected with the large-block clean coal crusher, the mixed middling raw coal discharge port is connected with the scraper conveyor, and the dense medium shallow slot sorter. The utility model is beneficial to the effective separation and utilization of the middling, the gangue and the clean coal, avoids the ash content of the lump clean coal exceeding the standard, and also avoids serious middling loss caused by the mixing of the middling into the lump gangue.

Description

Bulk raw coal sorting system with high middling content

Technical Field

The utility model relates to the technical field of coal preparation equipment, in particular to a bulk raw coal separation system with high medium coal content.

Background

In the field of coal dressing, a movable sieve jigger is generally adopted to sort large raw coal with the size of more than 50 mm. In particular to a mine adopting a caving coal mining process, more large gangue is mixed in raw coal, and a large amount of gangue can be discharged after washing and selecting, so that qualified large-block clean coal is produced. But the sorting precision of the movable sieve jigger is lower, and the imperfection degree I value is 0.09-0.11 according to GB 50539-2016. The movable sieve jigger is suitable for sorting large raw coal which is easy to select and medium to select, when the medium density grade material, namely medium coal, is high in content, the material is difficult to process, so that the rate of coal in gangue is high or the gangue amount in clean coal is large, and a product meeting the production requirement is not easy to obtain; if the sorting density is too high, the middlings are mixed into lump clean coal, so that the ash content of the lump clean coal exceeds the standard; if the separation density is too low, the middlings are mixed into the lump gangue, so that the middlings are seriously lost and cannot be effectively utilized.

Disclosure of utility model

The utility model provides a large-block raw coal sorting system with high middling content, which is beneficial to effectively separating and utilizing middling, gangue and clean coal, avoids the ash content of the block clean coal exceeding standard, and also avoids serious middling loss caused by mixing the middling into the block gangue.

The technical scheme of the utility model is realized as follows: the utility model provides a big piece raw coal sorting system that middling content is high, including from the top down raw coal belt conveyor, raw coal double-deck classifying screen and the movable sieve jigger that sets gradually, the below of movable sieve jigger is provided with big piece raw coal discharge gate, mix well piece raw coal discharge gate and last raw coal discharge gate, the last raw coal discharge gate links to each other with the feed inlet of last coal belt conveyor, big piece raw coal discharge gate links to each other with the feed inlet of movable sieve jigger, be provided with big piece clean coal discharge gate on the movable sieve jigger, big piece middling discharge gate and big piece waste rock discharge gate, big piece waste rock discharge gate links to each other with the feed inlet of waste coal belt conveyor, the discharge gate of big piece middling crusher links to each other with the feed inlet of big piece middling crusher, big piece clean coal discharge gate links to each other with the feed inlet of last belt conveyor and scraper conveyor respectively through the tee bend chute, big piece clean coal discharge gate links to each other with the feed inlet of big piece clean coal crusher and the feed inlet of big piece clean coal belt conveyor, the feed inlet of big piece clean coal crusher links to each other with the feed inlet of coal crusher in the big piece clean coal crusher, the feed inlet links to each other with the feed inlet of the coal crusher.

Further, a fixed medium removing sieve is arranged on the overflow side of the heavy medium shallow slot separator, a discharge hole of the fixed medium removing sieve is connected with a block clean coal double-layer medium removing sieve, a lower layer sieve surface outlet and an upper layer sieve surface outlet are arranged on the block clean coal double-layer medium removing sieve, the lower layer sieve surface outlet is connected with a mixed clean coal belt conveyor, and the upper layer sieve surface outlet is connected with a large clean coal belt conveyor.

Further, a waste rock discharge port of the heavy-medium shallow slot separator is connected with a feed port of the block waste rock medium-removing sieve, and a block waste rock discharge port of the block waste rock medium-removing sieve is connected with a feed port of the waste rock belt conveyor.

Further, the movable sieve jig comprises a casing, wherein a sorting chamber capable of reciprocating is arranged on one side in the casing, a gangue separating component, a middling separating component and a clean coal overflow component are arranged in the sorting chamber, a rotating lifting wheel is arranged on the other side in the casing, a gangue groove, a middling groove and a clean coal groove are arranged in the lifting wheel, and a large gangue discharge hole, a large middling discharge hole and a large clean coal discharge hole are arranged on the upper portion of the casing.

Further, the gangue separation assembly comprises a lower sieve plate arranged in the separation chamber, a gangue discharge wheel is arranged at the discharge end of the lower sieve plate, and the gangue discharge wheel is connected with the gangue groove through a gangue discharge chute.

Further, the middling separation assembly comprises an upper sieve plate, the upper sieve plate is located above the discharge end of the lower sieve plate, a vertical first overflow plate is arranged at the feed end of the upper sieve plate, a middling discharging wheel is arranged at the discharge end, and the middling discharging wheel is connected with the middling tank through a middling discharging chute.

Further, the clean coal overflow assembly comprises a vertical second overflow plate, the second overflow plate is located above the discharge end of the upper sieve plate, and the second overflow plate is connected with the clean coal tank through a downward inclined guide plate.

The utility model has the beneficial effects that:

(1) Dividing raw coal into a large block of raw coal, a mixed middle block of raw coal and a powder raw coal through a raw coal double-layer classifying screen, then waving a sieve jigger to realize the advantages of good gangue discharging effect and large treatment capacity on the large block of raw coal, discharging the large block of gangue in advance, greatly reducing the amount of gangue entering a subsequent heavy medium separation link, reducing the equipment model and the number of a heavy medium separation system, and avoiding disturbance of the stability of a heavy medium suspension caused by gangue slabbing;

(2) The movable sieve jigging separator can simultaneously produce three products of large-block clean coal, large-block middle coal and large-block gangue, and the treatment mode of the large-block middle coal is flexible. Depending on the coal quality and dissociation condition of the medium coal, the medium coal can be crushed to below 13mm by a large-sized medium coal crusher and mixed with 13-0mm of the fine raw coal. The coal can be crushed to be less than 200mm by a large-block medium coal crusher, and the crushed large-block medium coal and mixed block raw coal are mixed and enter a dense medium shallow groove separator for further separation, so that the effective separation and utilization of medium coal, gangue and refined coal are facilitated, the ash content of the block refined coal is prevented from exceeding the standard, and the serious medium coal loss caused by mixing the medium coal into the block gangue is also avoided;

(3) Compared with the traditional two sets of separation systems for main separation and recleaning of lump coal of the heavy medium shallow slot separator, the separation system omits a set of heavy medium separation and medium recovery purification system, is more compact, and reduces investment and operation cost;

(4) The production system is suitable for the power coal adopting the caving coal mining process, the granularity and the content of the gangue are reduced along with the granularity reduction, the ash content of the last raw coal is generally lower, the heating value is higher, the sorting system is not needed, the sorting system is more compact and concise, the product structure is flexible, the operation stability is good, and the production system is suitable for industrial production.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a bulk raw coal sorting system according to the present utility model;

Fig. 2 is a schematic view of a structure of a moving sieve jig.

Raw coal belt conveyor 1, raw coal double-deck classifying screen 2, moving screen jigger 3, last coal belt conveyor 4, scraper conveyor 5, gangue belt conveyor 6, bulk raw coal discharge port 7, mixed medium bulk raw coal discharge port 8, last raw coal discharge port 9, bulk clean coal discharge port 10, bulk medium coal discharge port 11, bulk gangue discharge port 12, bulk clean coal crusher 13, bulk medium coal crusher 14, three-way chute 15, heavy medium shallow trench classifier 16, fixed medium removal screen 17, bulk clean coal double-deck medium removal screen 18, lower screen surface outlet 19, upper screen surface outlet 20, mixed medium bulk clean coal belt conveyor 21, bulk clean coal belt conveyor 22, circulating medium drum 23, magnetic separator 24, bulk gangue medium removal screen 25, casing 26, sorting chamber 27, lifting wheel 28, gangue chute 29, medium chute 30, clean coal chute 31, lower screen plate 32, gangue discharge wheel 33, upper screen 34, first overflow wheel 35, medium chute 36, second screen plate 37, overflow chute 39, and overflow chute 38.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.

Example 1

As shown in fig. 1, the large-block raw coal sorting system with high medium coal content comprises a raw coal belt conveyor 1, a raw coal double-layer classifying screen 2 and a movable screen jigger 3 which are sequentially arranged from top to bottom, wherein a dust coal belt conveyor 4, a scraper conveyor 5 and a gangue belt conveyor 6 are arranged below the movable screen jigger 3, and a discharge port of the raw coal belt conveyor 1 is connected with a feed port of the raw coal double-layer classifying screen 2 through a machine head chute. The raw coal double-layer classifying screen 2 is provided with a large raw coal discharge port 7, a mixed raw coal discharge port 8 and a non-raw coal discharge port 9, the large raw coal discharge port 7 is connected with a feed port of a movable screen jigger 3 below through a large raw coal chute before screening, the mixed raw coal discharge port 8 is connected with a feed port of a scraper conveyor 5 below through a mixed raw coal chute before screening, and the non-raw coal discharge port 9 is connected with a non-raw coal belt conveyor 4 below through a undersize funnel.

The movable sieve jigger 3 is provided with a large block clean coal discharge port 10, a large block middle coal discharge port 11 and a large block waste rock discharge port 12, and the large block waste rock discharge port 12 is connected with a feed port of the waste rock belt conveyor 6 below through a large block waste rock chute. The large-block clean coal discharge port 10 is connected with the feed inlet of the large-block clean coal crusher 13 below through a large-block clean coal chute, the discharge port of the large-block clean coal crusher 13 is connected with the feed inlet of the scraper conveyor 5 through a discharge chute, the large-block middle coal discharge port 11 is connected with the feed inlet of the large-block middle coal crusher 14 below through a large-block middle coal chute, and the discharge port of the large-block middle coal crusher 14 is respectively connected with the feed inlets of the last coal belt conveyor 4 and the scraper conveyor 5 below through a three-way chute 15.

The discharge port of the scraper conveyor 5 is connected with the feed port of the heavy medium shallow slot separator 16 below through a machine head chute, a fixed medium removing sieve 17 is arranged on the overflow side of the heavy medium shallow slot separator 16, the discharge port of the fixed medium removing sieve 17 is connected with a block clean coal double-layer medium removing sieve 18 below through a chute, a lower layer sieve surface outlet 19 and an upper layer sieve surface outlet 20 are arranged on the block clean coal double-layer medium removing sieve 18, the lower layer sieve surface outlet 19 is connected with a mixed clean coal belt conveyor 21 through a mixed clean coal chute before sieving, the upper layer sieve surface outlet 20 is connected with a large clean coal belt conveyor 22 before sieving, and the mixed clean coal belt conveyor 21 and the large clean coal belt conveyor 22 are both positioned below the block clean coal double-layer medium removing sieve 18. The undersize funnel of the front third section of the block clean coal double layer medium removing sieve 18 is connected with a circulating medium barrel 23 through a pipeline, and the undersize funnel of the rear two third section of the block clean coal double layer medium removing sieve 18 is connected with a magnetic separator 24 through a pipeline.

The waste rock discharge port of the heavy-medium shallow-slot separator 16 is connected with the feed port of the waste rock medium-removing sieve 25 through a waste rock discharge chute, and the waste rock discharge port of the waste rock medium-removing sieve 25 is connected with the feed port of the waste rock belt conveyor 6 through a chute before the sieve. The undersize funnel of the front third section of the block gangue removing sieve 25 is connected with the circulating medium barrel 23 through a pipeline, the undersize funnel of the rear two third section of the block gangue removing sieve 25 is connected with the magnetic separator 24 through a pipeline, and the magnetic separator 24 is connected with the circulating medium barrel 23 through a pipeline.

The application method of the bulk raw coal sorting system comprises the following steps:

a. 300-0mm raw coal is fed into a raw coal double-layer classifying screen 2 (the screen holes of the upper layer are 50mm, the screen holes of the lower layer are 13 or 25 mm) by a raw coal belt conveyor 1 to obtain large raw coal blocks, mixed medium raw coal blocks and powder raw coal blocks, the large raw coal blocks automatically flow into a movable screen jigger 3 through large raw coal block chute, the mixed medium raw coal blocks enter a scraper conveyor 5 through the mixed medium raw coal block chute, and the powder raw coal blocks enter a powder coal belt conveyor 4 through a undersize funnel;

b. After being sorted by a movable sieve jig 3, the bulk raw coal is produced into bulk clean coal, bulk middling coal and bulk gangue, the bulk clean coal and the bulk middling coal respectively flow into corresponding crushers in a self-flowing way through a chute, the bulk clean coal is crushed to be less than 200 or 150mm and then enters a scraper conveyor 5, the bulk middling coal is crushed to be less than 13 or 25mm and then enters a dust coal belt conveyor 4 in a self-flowing way through a three-way chute 15, the bulk middling coal can also be crushed to be less than 200 or 150mm and then flows into the scraper conveyor 5 in a self-flowing way through the three-way chute 15;

c. The materials in the scraper conveyor 5 are reversed and flow into the heavy medium shallow slot separator 16 through a machine head chute, overflow of the heavy medium shallow slot separator 16 flows into the fixed medium removing sieve 17, clean coal on the sieve flows into the block clean coal double-layer medium removing sieve 18 through a chute to obtain large block clean coal and mixed clean coal, the large block clean coal flows into the large block clean coal belt conveyor 22 through a pre-sieve chute, and mixed clean coal flows into the mixed clean coal belt conveyor 21 through a pre-sieve chute;

d. Waste rocks of the heavy medium shallow slot separator 16 flow into a block waste rock medium removing sieve 25 through a chute, and the block waste rocks flow into a block waste rock belt conveyor 6 through a pre-sieve chute;

e. The undersize qualified medium of the fixed medium removing sieve 17, the undersize qualified medium of the block clean coal double-layer medium removing sieve 18 and the undersize qualified medium of the block gangue medium removing sieve 25 flow into the circulating medium barrel 23 respectively through pipelines, and are pumped into the heavy medium shallow slot separator 16 through pipelines by a pump for recycling;

f. The qualified medium which is shunted out of the undersize qualified medium of the fixed medium removing sieve 17, the undersize diluted medium of the block clean coal double-layer medium removing sieve 18 and the undersize diluted medium of the block gangue medium removing sieve 25 respectively flow into the magnetic separator 24 through the pipe, the concentrated medium of the magnetic separator 24 flows into the circulating medium barrel 23 through the pipe, and the slime water of the magnetic separator 24 enters the slime water treatment system.

Example two

The embodiment is basically the same as the first embodiment, except that, as shown in fig. 2, the movable sieve jig 3 includes a housing 26, a sorting chamber 27 that reciprocates is provided at one side in the housing 26, the sorting chamber 27 reciprocates through a hydraulic driving system, a rotating lifting wheel 28 is mounted at the other side in the housing 26, a gangue trough 29, a middling trough 30 and a clean coal trough 31 are fixed in the lifting wheel 28, and a large gangue discharge port 12 corresponding to the gangue trough 29, a large middling discharge port 11 corresponding to the middling trough 30 and a large clean coal discharge port 10 corresponding to the clean coal trough 31 are provided at the upper part of the housing 26. Through the rotation of lifting wheel 28, promote gangue groove 29, well coal groove 30 and clean coal groove 31 of bottom to the top, the notch is downward, and the material in gangue groove 29, well coal groove 30 and the clean coal groove 31 falls into corresponding discharge gate.

The separation chamber 27 is internally provided with a gangue separation assembly, a middling separation assembly and a clean coal overflow assembly, wherein the gangue separation assembly comprises a lower sieve plate 32 fixed in the separation chamber 27, and a gangue discharge wheel 33 at the discharge end of the lower sieve plate 32 is connected with the gangue groove 29 through a gangue discharge chute 39. The middling separation assembly comprises an upper sieve plate 34, wherein the upper sieve plate 34 is positioned above the discharge end of the lower sieve plate 32, the lower sieve plate 32 and the upper sieve plate 34 are connected through a connecting plate, the connecting plate is channel steel, a vertical first overflow plate 35 is fixed at the feed end of the upper sieve plate 34, and a middling discharging wheel 36 at the discharge end is connected with the middling tank 30 through a middling discharging chute 40. The mesh size of the upper screen deck 34 and the lower screen deck 32 is 10-20mm.

The clean coal overflow assembly comprises a vertical second overflow plate 37, the second overflow plate 37 is positioned above the discharge end of the upper sieve plate 34, and the second overflow plate 37 is connected with the clean coal tank 31 through a downward inclined guide plate. The lower end of the housing 26 is also provided with a collection hopper 38, and the slime water of the upper screen plate 34 and the lower screen plate 32 automatically flows into the collection hopper 38 and is discharged from a discharge port of the collection hopper 38 to be discharged outside the machine by a bucket elevator.

The use method of the movable sieve jig 3 comprises the following steps:

a. Feeding 300-50mm bulk raw coal into a sorting chamber 27 which is driven by a hydraulic driving system to reciprocate through a feed inlet of a movable sieve jigger 3, and falling on a lower sieve plate 32;

b. The waste rock sinking on the lower sieve plate 32 is fed into the waste rock groove 29 by the waste rock discharging wheel 33, overflows through the first overflow plate 35 and falls onto the upper sieve plate 34;

c. Middlings sinking on the upper screen plate 34 are fed into the middling tank 30 by a middling discharge wheel 36, overflowed through a second overflow plate 37 and then enter the clean coal tank 31;

d. Under the drive of the lifting wheel 28, the gangue, middlings and clean coal are lifted to the top of the lifting wheel 28 and discharged outside the machine through the large gangue discharge port 12, the large middling discharge port 11 and the large clean coal discharge port 10 respectively.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (7)

1. A bulk raw coal sorting system with high middling content is characterized in that: the device comprises a raw coal belt conveyor, a raw coal double-layer classifying screen and a movable screen jigger which are sequentially arranged from top to bottom, wherein a bulk raw coal discharge port, a mixed raw coal discharge port and a bulk raw coal discharge port are arranged on the raw coal double-layer classifying screen, the bulk raw coal discharge port is connected with a feed port of the bulk raw coal belt conveyor, the bulk raw coal discharge port is connected with a feed port of the movable screen jigger, the movable screen jigger is provided with a bulk clean coal discharge port, a bulk middle coal discharge port and a bulk waste rock discharge port, the bulk waste rock discharge port is connected with a feed port of the waste rock belt conveyor, the bulk middle coal discharge port is connected with a feed port of the bulk middle coal crusher, the bulk middle coal crusher discharge port is respectively connected with feed ports of the bulk clean coal belt conveyor and the scraper conveyor through a three-way chute, the bulk clean coal discharge port is connected with a feed port of the bulk clean coal crusher, the bulk clean coal discharge port and the mixed clean coal crusher discharge port is connected with a feed port of the coal crusher, and the bulk waste coal crusher discharge port is connected with a feed port of the coal crusher is connected with a feed port of the separator.

2. The bulk raw coal sorting system with high middling content according to claim 1, wherein: the overflow side of the heavy medium shallow slot separator is provided with a fixed medium removing sieve, a discharge port of the fixed medium removing sieve is connected with a block clean coal double-layer medium removing sieve, a lower layer sieve surface outlet and an upper layer sieve surface outlet are arranged on the block clean coal double-layer medium removing sieve, the lower layer sieve surface outlet is connected with a mixed clean coal belt conveyor, and the upper layer sieve surface outlet is connected with a large clean coal belt conveyor.

3. A bulk raw coal sorting system with high middlings content according to claim 1 or 2, characterized in that: the waste rock discharge port of the heavy-medium shallow slot separator is connected with the feed port of the block waste rock medium-removing sieve, and the block waste rock discharge port of the block waste rock medium-removing sieve is connected with the feed port of the waste rock belt conveyor.

4. The bulk raw coal sorting system with high middling content according to claim 1, wherein: the movable sieve jigger comprises a casing, wherein a sorting chamber capable of reciprocating is arranged on one side in the casing, a gangue separating component, a middling separating component and a clean coal overflow component are arranged in the sorting chamber, a rotating lifting wheel is arranged on the other side in the casing, a gangue groove, a middling groove and a clean coal groove are arranged in the lifting wheel, and a large gangue discharge hole, a large middling discharge hole and a large clean coal discharge hole are arranged on the upper portion of the casing.

5. The high middling content bulk raw coal sorting system of claim 4, wherein: the gangue separation assembly comprises a lower sieve plate arranged in the separation chamber, a gangue discharge wheel is arranged at the discharge end of the lower sieve plate, and the gangue discharge wheel is connected with the gangue trough through a gangue discharge chute.

6. The high middling content bulk raw coal sorting system of claim 4, wherein: the middling separating assembly comprises an upper sieve plate, the upper sieve plate is located above the discharge end of the lower sieve plate, a vertical first overflow plate is arranged at the feed end of the upper sieve plate, a middling discharging wheel is arranged at the discharge end, and the middling discharging wheel is connected with the middling tank through a middling discharging chute.

7. The high middling content bulk raw coal sorting system of claim 4, wherein: the clean coal overflow assembly comprises a vertical second overflow plate, the second overflow plate is located above the discharge end of the upper sieve plate, and the second overflow plate is connected with the clean coal tank through a downward inclined guide plate.