CN220941187U - A large raw coal sorting system with high medium coal 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

A large raw coal sorting system with high medium coal content

Technical Field

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

Background technique

In the field of coal preparation, dynamic screen jigs are usually used to sort large pieces of raw coal larger than 50 mm. In particular, in mines that use the top coal mining process, there are many large pieces of gangue mixed in the raw coal. After washing, a large amount of gangue can be discharged to produce qualified large pieces of clean coal. However, the sorting accuracy of the dynamic screen jig is low. According to GB50539-2016, its imperfection I value is 0.09-0.11. The dynamic screen jig is suitable for sorting large pieces of raw coal that are easy to select and medium to select. When the content of the intermediate density material, that is, medium coal, is high, it is difficult to handle, resulting in a high coal rate in the gangue or a large amount of gangue in the clean coal, and it is not easy to obtain products that meet production requirements; if the sorting density is too high, the medium coal is mixed with the clean coal, resulting in excessive ash content in the clean coal; if the sorting density is too low, the medium coal is mixed with the gangue, resulting in serious loss of the medium coal and ineffective utilization.

Utility Model Content

The utility model provides a large lump raw coal sorting system with high medium coal content, which is beneficial to the effective separation and utilization of medium coal, gangue and clean coal, avoids excessive ash content of the clean coal, and also avoids serious loss of medium coal caused by mixing medium coal with gangue.

The technical solution of the utility model is implemented as follows: a large raw coal sorting system with high medium coal content comprises a raw coal belt conveyor, a raw coal double-layer grading screen and a moving screen jig which are arranged in sequence from top to bottom, a fine coal belt conveyor, a scraper conveyor and a gangue belt conveyor are arranged below the moving screen jig, a large raw coal discharge port, a mixed medium raw coal discharge port and a fine raw coal discharge port are arranged on the raw coal double-layer grading screen, the fine raw coal discharge port is connected to the feeding port of the fine coal belt conveyor, the large raw coal discharge port is connected to the feeding port of the moving screen jig, and a large raw coal discharge port is arranged on the moving screen jig. The discharge port of large clean coal, large medium coal and large gangue, the discharge port of large gangue is connected to the feed port of gangue belt conveyor, the discharge port of large medium coal is connected to the feed port of large medium coal crusher, the discharge port of large medium coal crusher is connected to the feed ports of fine coal belt conveyor and scraper conveyor respectively through three-way chute, the discharge port of large clean coal is connected to the feed port of large clean coal crusher, the discharge port of large clean coal crusher and mixed medium raw coal are both connected to the feed port of scraper conveyor, and the discharge port of scraper conveyor is connected to the feed port of heavy medium shallow trough separator.

Furthermore, a fixed de-mediating screen is provided on the overflow side of the heavy medium shallow trough separator, and the discharge port of the fixed de-mediating screen is connected to the double-layer de-mediating screen for lump clean coal. The double-layer de-mediating screen for lump clean coal is provided with a lower screen surface outlet and an upper screen surface outlet, the lower screen surface outlet is connected to a mixed lump clean coal belt conveyor, and the upper screen surface outlet is connected to a large lump clean coal belt conveyor.

Furthermore, the gangue discharge port of the heavy medium shallow trough separator is connected to the feed port of the block gangue de-media screen, and the block gangue discharge port of the block gangue de-media screen is connected to the feed port of the gangue belt conveyor.

Furthermore, the moving screen jig includes a casing, a reciprocating sorting chamber is provided on one side of the casing, a gangue separation component, a medium coal separation component and a clean coal overflow component are provided in the sorting chamber, a rotating lifting wheel is provided on the other side of the casing, a gangue trough, a medium coal trough and a clean coal trough are provided in the lifting wheel, and a large gangue discharge port, a large medium coal discharge port and a large clean coal discharge port are provided on the upper part of the casing.

Furthermore, the gangue separation component includes a lower screen plate arranged in the sorting chamber, and a gangue discharge wheel is arranged at the discharge end of the lower screen plate, and the gangue discharge wheel is connected to the gangue trough through a gangue discharge chute.

Furthermore, the middle coal separation assembly includes an upper sieve plate, which is located above the discharge end of the lower sieve plate. The feed end of the upper sieve plate is provided with a vertical first overflow plate, and the discharge end is provided with a middle coal discharge wheel, which is connected to the middle coal trough through a middle coal discharge chute.

Furthermore, the clean coal overflow assembly includes a vertical second overflow plate, the second overflow plate is located above the discharge end of the upper screen plate, and the second overflow plate is connected to the clean coal trough through a downwardly inclined guide plate.

Beneficial effects of the utility model:

(1) The raw coal is divided into large raw coal, mixed medium raw coal and fine raw coal through the double-layer grading screen, and then the advantages of the dynamic screen jig for large raw coal are brought into play, such as good gangue removal effect and large processing capacity, and large gangue is discharged in advance, which greatly reduces the amount of gangue entering the subsequent heavy medium separation link, reduces the equipment model and number of the heavy medium separation system, and avoids the disturbance of the stability of the heavy medium suspension by the muddling of gangue;

(2) The dynamic screen jigging separator can produce three products at the same time: large clean coal, large medium coal and large gangue, and the processing method of large medium coal is relatively flexible. Depending on the quality and dissociation of the medium coal, it can be crushed to less than 13mm by a large medium coal crusher and mixed with 13-0mm fine raw coal. It can also be crushed to less than 200mm by a large medium coal crusher, mixed with the crushed large clean coal and mixed medium raw coal, and enter the heavy medium shallow trough separator for further sorting, which is conducive to the effective separation and utilization of medium coal, gangue and clean coal, avoiding excessive ash content in clean coal and serious loss of medium coal caused by mixing with gangue.

(3) Compared with the two separation systems of the traditional heavy medium shallow trough separator for lump coal, the new separation system saves one set of heavy medium separation and medium recovery and purification system, making the system more compact and reducing investment and operation costs;

(4) This production system is suitable for thermal coal that adopts the top coal mining process. The particle size and content of gangue decrease as the particle size decreases. The ash content of the final raw coal is generally low and the calorific value is high. No sorting is required. The sorting system is more compact and simple, the product structure is flexible, and the operation stability is good, which is suitable for industrial production.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a bulk raw coal sorting system of the utility model;

Figure 2 is a schematic diagram of the structure of the moving screen jig.

Raw coal belt conveyor 1, raw coal double-layer grading screen 2, dynamic screen jig machine 3, fine coal belt conveyor 4, scraper conveyor 5, gangue belt conveyor 6, large raw coal discharge port 7, mixed medium raw coal discharge port 8, fine raw coal discharge port 9, large clean coal discharge port 10, large medium coal discharge port 11, large gangue discharge port 12, large clean coal crusher 13, large medium coal crusher 14, three-way chute 15, heavy medium shallow trough separator 16, fixed de-mediating screen 17, double-layer de-mediating screen for lump clean coal 18, lower screen Surface outlet 19, upper screen surface outlet 20, mixed medium block clean coal belt conveyor 21, large block clean coal belt conveyor 22, circulating medium barrel 23, magnetic separator 24, block gangue de-mediating screen 25, casing 26, sorting chamber 27, lifting wheel 28, gangue trough 29, medium coal trough 30, clean coal trough 31, lower screen plate 32, gangue discharge wheel 33, upper screen plate 34, first overflow plate 35, medium coal discharge wheel 36, second overflow plate 37, collecting funnel 38, gangue discharge chute 39, medium coal discharge chute 40.

Detailed ways

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Embodiment 1

As shown in FIG1 , a large raw coal sorting system with high medium coal content includes a raw coal belt conveyor 1, a raw coal double-layer grading screen 2 and a moving screen jig 3 arranged in sequence from top to bottom. A fine coal belt conveyor 4, a scraper conveyor 5 and a gangue belt conveyor 6 are arranged below the moving screen jig 3. The discharge port of the raw coal belt conveyor 1 is connected to the feed port of the raw coal double-layer grading screen 2 through the head chute. The raw coal double-layer grading screen 2 is provided with a large raw coal discharge port 7, a mixed medium raw coal discharge port 8 and a fine raw coal discharge port 9. The large raw coal discharge port 7 is connected to the feed port of the moving screen jig 3 below through the large raw coal chute before the screen, the mixed medium raw coal discharge port 8 is connected to the feed port of the scraper conveyor 5 below through the mixed medium raw coal chute before the screen, and the fine raw coal discharge port 9 is connected to the fine coal belt conveyor 4 below through the under-screen hopper.

The moving screen jig 3 is provided with a large clean coal discharge port 10, a large medium coal discharge port 11 and a large gangue discharge port 12. The large gangue discharge port 12 is connected to the feed port of the gangue belt conveyor 6 below through the large gangue chute. The large clean coal discharge port 10 is connected to the feed port of the large clean coal crusher 13 below through the large clean coal chute. The discharge port of the large clean coal crusher 13 is connected to the feed port of the scraper conveyor 5 through the discharge chute. The large medium coal discharge port 11 is connected to the feed port of the large medium coal crusher 14 below through the large medium coal chute. The discharge port of the large medium coal crusher 14 is connected to the feed ports of the final coal belt conveyor 4 and the scraper conveyor 5 below through the three-way chute 15.

The discharge port of the scraper conveyor 5 is connected to the feed port of the heavy medium shallow trough separator 16 below through the head chute. A fixed de-mediating screen 17 is provided on the overflow side of the heavy medium shallow trough separator 16. The discharge port of the fixed de-mediating screen 17 is connected to the double-layer de-mediating screen 18 for lump clean coal below through the chute. The double-layer de-mediating screen 18 for lump clean coal is provided with a lower screen surface outlet 19 and an upper screen surface outlet 20. The lower screen surface outlet 19 is connected to the mixed lump clean coal belt conveyor 21 through the pre-screen mixed lump clean coal chute. The upper screen surface outlet 20 is connected to the pre-screen large lump clean coal chute with the large lump clean coal belt conveyor 22. The mixed lump clean coal belt conveyor 21 and the large lump clean coal belt conveyor 22 are both located below the double-layer de-mediating screen 18 for lump clean coal. The under-screen funnel of the front third section of the double-layer de-mediating screen 18 for lump clean coal is connected to the circulating medium barrel 23 through a pipeline, and the under-screen funnel of the rear two-third section of the double-layer de-mediating screen 18 for lump clean coal is connected to the magnetic separator 24 through a pipeline.

The gangue discharge port of the heavy medium shallow trough separator 16 is connected to the feed port of the gangue removal screen 25 through the gangue discharge chute, and the gangue discharge port of the gangue removal screen 25 is connected to the feed port of the gangue belt conveyor 6 through the pre-screen chute. The under-screen funnel of the front third section of the gangue removal screen 25 is connected to the circulating medium barrel 23 through a pipeline, and the under-screen funnel of the rear two thirds section of the gangue removal screen 25 is connected to the magnetic separator 24 through a pipeline, and the magnetic separator 24 is connected to the circulating medium barrel 23 through a pipeline.

The method for using the bulk raw coal sorting system comprises the following steps:

a. 300-0mm raw coal is fed into the raw coal double-layer grading screen 2 (the upper screen hole is 50mm, the lower screen hole is 13 or 25mm) by the raw coal belt conveyor 1 to obtain large raw coal, mixed medium raw coal and fine raw coal. The large raw coal flows into the dynamic screen jig 3 through the large raw coal chute, the mixed medium raw coal enters the scraper conveyor 5 through the mixed medium raw coal chute, and the fine raw coal enters the fine coal belt conveyor 4 through the hopper under the screen;

b. After the large pieces of raw coal are sorted by the moving screen jig 3, large pieces of clean coal, large pieces of medium coal and large pieces of gangue are produced. The large pieces of clean coal and large pieces of medium coal flow into the corresponding crushers through the chutes by gravity. The large pieces of clean coal are crushed to less than 200 or 150 mm and then enter the scraper conveyor 5. The large pieces of medium coal are crushed to less than 13 or 25 mm and flow into the final coal belt conveyor 4 through the three-way chute 15 by gravity. The large pieces of medium coal can also be crushed to less than 200 or 150 mm and flow into the scraper conveyor 5 through the three-way chute 15 by gravity.

c. The materials in the scraper conveyor 5 are transferred and flow into the heavy medium shallow trough separator 16 by gravity through the head chute. The overflow of the heavy medium shallow trough separator 16 flows into the fixed de-mediation screen 17 by gravity. The clean coal on the screen flows into the double-layer de-mediation screen 18 of lump clean coal by gravity through the chute to obtain large lump clean coal and mixed medium lump clean coal. The large lump clean coal flows into the large lump clean coal belt conveyor 22 by gravity through the chute before the screen, and the mixed medium lump clean coal flows into the mixed medium lump clean coal belt conveyor 21 by gravity through the chute before the screen;

d. The gangue from the heavy medium shallow trough separator 16 flows by gravity into the gangue removal screen 25 through the chute, and the gangue flows by gravity into the gangue belt conveyor 6 through the chute before the screen;

e. The qualified medium under the fixed de-mediation screen 17, the qualified medium under the lump clean coal double-layer de-mediation screen 18, and the qualified medium under the lump gangue de-mediation screen 25 flow into the circulating medium barrel 23 through the pipeline, and then are pumped into the heavy medium shallow tank separator 16 through the pipeline for recycling;

f. The qualified medium separated from the qualified medium under the fixed de-mediating screen 17, the dilute medium under the screen of the double-layer de-mediating screen 18 for lump clean coal, and the dilute medium under the screen of the lump gangue de-mediating screen 25 flow into the magnetic separator 24 through pipelines respectively, and the concentrated medium of the magnetic separator 24 flows into the circulating medium barrel 23 through pipelines, and the coal slurry water of the magnetic separator 24 enters the coal slurry water treatment system.

Embodiment 2

This embodiment is basically the same as the first embodiment, except that, as shown in FIG. 2 , the moving screen jig 3 includes a housing 26, a reciprocating sorting chamber 27 is provided on one side of the housing 26, and the sorting chamber 27 reciprocates through a hydraulic drive system, a rotating lifting wheel 28 is installed on the other side of the housing 26, a gangue trough 29, a medium coal 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 medium coal discharge port 11 corresponding to the medium coal trough 30 and a large clean coal discharge port 10 corresponding to the clean coal trough 31 are provided on the upper part of the housing 26. By rotating the lifting wheel 28, the gangue trough 29, the medium coal trough 30 and the clean coal trough 31 at the bottom are lifted to the top, with the troughs facing downward, and the materials in the gangue trough 29, the medium coal trough 30 and the clean coal trough 31 fall into the corresponding discharge ports.

The sorting chamber 27 is provided with a gangue separation assembly, a medium coal separation assembly and a clean coal overflow assembly. The gangue separation assembly includes a lower sieve plate 32 fixed to the sorting chamber 27. The gangue discharge wheel 33 at the discharge end of the lower sieve plate 32 is connected to the gangue trough 29 through a gangue discharge chute 39. The medium coal separation assembly includes an upper sieve plate 34, which is located above the discharge end of the lower sieve plate 32. The lower sieve plate 32 and the upper sieve plate 34 are connected by a connecting plate, which is a channel steel. A vertical first overflow plate 35 is fixed to the feed end of the upper sieve plate 34, and the medium coal discharge wheel 36 at the discharge end is connected to the medium coal trough 30 through a medium coal discharge chute 40. The sieve hole size of the upper sieve plate 34 and the lower sieve plate 32 is 10-20 mm.

The clean coal overflow assembly includes a vertical second overflow plate 37, which is located above the discharge end of the upper screen plate 34 and is connected to the clean coal trough 31 through a downwardly inclined guide plate. A collecting funnel 38 is also provided at the lower end of the casing 26, and the coal slurry water on the upper screen plate 34 and the lower screen plate 32 flows into the collecting funnel 38 by gravity, and is discharged from the discharge port of the collecting funnel 38 and discharged out of the machine by the bucket elevator.

The method for using the moving screen jig 3 comprises the following steps:

a. The 300-50mm large pieces of raw coal enter the sorting chamber 27 driven by the hydraulic drive system to reciprocate through the feed port of the dynamic screen jig 3, and fall on the lower screen plate 32;

b. The gangue sinking on the lower screen plate 32 is fed into the gangue trough 29 by the gangue discharge wheel 33, and after overflowing through the first overflow plate 35, falls onto the upper screen plate 34;

c. The medium coal sinking on the upper screen plate 34 is fed into the medium coal tank 30 by the medium coal discharging wheel 36, and overflows through the second overflow plate 37 and enters the clean coal tank 31;

d. Driven by the lifting wheel 28, the gangue, medium coal and clean coal are lifted to the top of the lifting wheel 28 and discharged out of the machine through the large gangue discharge port 12, the large medium coal discharge port 11 and the large clean coal discharge port 10 respectively.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A large raw coal sorting system with high medium coal content, characterized in that it comprises a raw coal belt conveyor, a raw coal double-layer grading screen and a moving screen jig arranged in sequence from top to bottom, a fine coal belt conveyor, a scraper conveyor and a gangue belt conveyor are arranged below the moving screen jig, a large raw coal discharge port, a mixed medium raw coal discharge port and a fine raw coal discharge port are arranged on the raw coal double-layer grading screen, the fine raw coal discharge port is connected to the feed port of the fine coal belt conveyor, the large raw coal discharge port is connected to the feed port of the moving screen jig, and a large clean coal discharge port is arranged on the moving screen jig The outlet of large piece of medium coal is connected with the feeding port of gangue belt conveyor, the outlet of large piece of medium coal is connected with the feeding port of large piece of medium coal crusher, the outlet of large piece of medium coal crusher is connected with the feeding port of fine coal belt conveyor and scraper conveyor respectively through three-way chute, the outlet of large piece of clean coal is connected with the feeding port of large piece of clean coal crusher, the outlet of large piece of clean coal crusher and the outlet of mixed medium piece of raw coal are both connected with the feeding port of scraper conveyor, the outlet of scraper conveyor is connected with the feeding port of heavy medium shallow trough separator. 2. A large lump raw coal sorting system with high medium coal content according to claim 1 is characterized in that: a fixed de-mediation screen is provided on the overflow side of the heavy medium shallow trough separator, the discharge port of the fixed de-mediation screen is connected to the double-layer de-mediation screen for lump clean coal, and the double-layer de-mediation screen for lump clean coal is provided with a lower screen surface outlet and an upper screen surface outlet, the lower screen surface outlet is connected to a mixed medium lump clean coal belt conveyor, and the upper screen surface outlet is connected to a large lump clean coal belt conveyor. 3. A large lump raw coal sorting system with high medium coal content according to claim 1 or 2, characterized in that: the gangue discharge port of the heavy medium shallow trough separator is connected to the feed port of the block gangue de-media screen, and the block gangue discharge port of the block gangue de-media screen is connected to the feed port of the gangue belt conveyor. 4. A large-lump raw coal sorting system with high medium coal content according to claim 1 is characterized in that: the moving screen jig includes a casing, a reciprocating sorting chamber is provided on one side of the casing, a gangue separation component, a medium coal separation component and a clean coal overflow component are provided in the sorting chamber, a rotating lifting wheel is provided on the other side of the casing, a gangue trough, a medium coal trough and a clean coal trough are provided in the lifting wheel, and a large gangue discharge port, a large medium coal discharge port and a large clean coal discharge port are provided on the upper part of the casing. 5. A large raw coal sorting system with high medium coal content according to claim 4, characterized in that: the gangue separation component includes a lower screen plate arranged in the sorting chamber, and a gangue discharge wheel is arranged at the discharge end of the lower screen plate, and the gangue discharge wheel is connected to the gangue trough through a gangue discharge chute. 6. A large raw coal sorting system with a high medium coal content according to claim 4 is characterized in that: the medium coal separation component includes an upper sieve plate, the upper sieve plate is located above the discharge end of the lower sieve plate, the feed end of the upper sieve plate is provided with a vertical first overflow plate, and the discharge end is provided with a medium coal discharge wheel, which is connected to the medium coal trough through a medium coal discharge chute. 7. A large raw coal sorting system with high medium coal content according to claim 4 is characterized in that the clean coal overflow assembly includes a vertical second overflow plate, the second overflow plate is located above the discharge end of the upper screen plate, and the second overflow plate is connected to the clean coal trough through a downward inclined guide plate.