CN221046629U - Screening device and sorting system - Google Patents

Abstract

The utility model provides a screening device and a sorting system, wherein the screening device comprises: a screening member having a first screening outlet and a second screening outlet, the first screening outlet having a screen reject with a particle size greater than the particle size of the screen reject of the second screening outlet; a first transport member having a first transport passage, a second transport member having a second transport passage; the screening device is provided with a first screening state and a second screening state by adjusting the position of the shielding part; when the screening device is in a first screening state, the screening out matters at the first screening outlet enter the input port of the first conveying channel through the shielding component, and the screening out matters at the second screening outlet enter the input port of the second conveying channel under the shielding action of the shielding component. The utility model solves the problem of low raw coal selection rate caused by the fact that a relaxation sieve with fixed mesh size in the prior art cannot flexibly screen according to the content of the tail coal in the raw coal.

Description

Screening device and sorting system

Technical Field

The utility model relates to the technical field of coal sorting, in particular to a screening device and a sorting system.

Background

Coal is used as main energy, occupies important positions in energy production and consumption structures, and is an energy foundation for national economy development and industrial production. Coal dressing is used as a source technology of clean coal technology, and coal sorting can effectively reduce ash content and sulfur content of raw coal and improve heat productivity of coal, so that transportation load is reduced, emission of trace elements, CO ₂, dust and other pollutants in coal is reduced, and atmospheric pollution is lightened. The selection of an efficient sorting and upgrading means is a key for realizing clean and efficient utilization of coal.

At present, a heavy medium shallow slot separator is used as main separation equipment for separating coal from the power coal in the coal separation process of the power coal, however, the problem of lower lump content of coal produced by partial power coal ores exists, and the separation efficiency of the heavy medium shallow slot separator is lower when all raw coal enters the heavy medium shallow slot separator.

In the prior art, the relaxation sieve with the diameter of 13mm is used for efficiently screening raw coal before the raw coal enters the dense-medium shallow-slot separator, screened lump coal is sent to the dense-medium shallow-slot separator, screened fine coal is sent to a fine coal washing system for product sale or enters the fine coal washing system for washing, the fine coal is prevented from entering the dense-medium shallow-slot separator for separation, and the washing efficiency of the dense-medium shallow-slot separator is improved. However, the fluctuation of coal quality of raw coal is large, when the content of the tail coal in the raw coal is high, the relaxation sieve with fixed mesh size can cause the quantity of the separated coal entering the dense medium shallow slot separator to be too small, and further the raw coal entering selection rate is low.

Disclosure of utility model

The utility model mainly aims to provide a screening device and a screening system, which are used for solving the problem that the raw coal selection rate cannot be flexibly adjusted because a relaxation screen with fixed mesh size cannot be flexibly screened according to the content of the tail coal in the raw coal in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a screening apparatus comprising: the screening component is provided with a first screening outlet and a second screening outlet which are arranged at intervals along a first preset direction, and the grain size of the screened product of the first screening outlet is larger than that of the screened product of the second screening outlet; a first transport member having a first transport channel and a second transport member having a second transport channel; the screening component is positioned on the same side of the input port of the first transportation channel and the input port of the second transportation channel; the shielding component is arranged among the input port of the first transportation channel, the input port of the second transportation channel, the first screening outlet and the second screening outlet, and the position of the shielding component is adjustably arranged so that the screening device has a first screening state and a second screening state by adjusting the position of the shielding component; when the screening device is in a first screening state, two ends of the shielding component are respectively communicated with the input port of the first conveying channel and the first screening outlet, so that screened objects at the first screening outlet enter the input port of the first conveying channel through the shielding component, and screened objects at the second screening outlet enter the input port of the second conveying channel under the shielding effect of the shielding component; when the screening device is in the second screening state, the two ends of the shielding component are respectively communicated with the input port of the first conveying channel and the second screening outlet, so that screened objects at the second screening outlet and the first screening outlet enter the input port of the first conveying channel through the shielding component.

Further, the screening means further comprises: the shell comprises a first shell wall, a second shell wall and a third shell wall which are sequentially connected, wherein the first shell wall and the third shell wall are oppositely arranged, and the second shell wall is positioned between the first shell wall and the third shell wall; the first screening plate and the second screening plate are arranged in an area surrounded by the first shell wall, the second shell wall and the third shell wall; the first screening plates and the second screening plates are arranged at intervals along a first preset direction, the first screening plates are arranged above the second screening plates, the first shell wall and the third shell wall jointly enclose a first screening outlet, and the first screening outlet and the second shell wall are arranged oppositely; the second screening plate, the first shell wall and the third shell wall jointly enclose a second screening outlet, and the second screening outlet and the second shell wall are oppositely arranged.

Further, a plurality of first screening holes are formed in the first screening plate at intervals, and the first screening holes are communicated with a feed inlet of a screening component for pouring objects to be screened; a plurality of second screening holes are formed in the second screening plate at intervals; the flow cross section of the first screening hole is larger than that of the second screening hole; and/or, a discharge hole is formed by encircling among the bottom end of the first shell wall, the bottom end of the second shell wall and the bottom end of the third shell wall, and the discharge hole is arranged opposite to the second screening plate.

Further, the first screening hole has a hole diameter of 25mm, and the second screening hole has a hole diameter of 13mm.

Further, the first transportation component comprises a first channel wall, the first channel wall comprises a first channel wall section, a second channel wall section and a third channel wall section which are sequentially connected, the first channel wall section and the third channel wall section are oppositely arranged, and the first channel wall section, the second channel wall section and the third channel wall section jointly enclose a first transportation channel; wherein the first end of the shielding member is movably connected with the second channel wall section such that the shielding member is adjustably arranged.

Further, the second transportation component comprises a second channel wall, the second channel wall comprises a fourth channel wall section, a fifth channel wall section and a sixth channel wall section which are sequentially connected, the fourth channel wall section and the sixth channel wall section are oppositely arranged, and the fourth channel wall section, the fifth channel wall section and the sixth channel wall section jointly enclose a second transportation channel; wherein the fourth channel wall section is arranged obliquely to the vertical plane; the third channel wall section is connected to the sixth channel wall section.

Further, the shielding component is a baffle; and/or the shielding member is rotatably arranged.

Further, when the screening device is in the first screening state, the second end of the shielding component is connected with the first screening plate, so that screened objects at the first screening outlet enter the input port of the first conveying channel through the shielding component, and screened objects at the second screening outlet enter the input port of the second conveying channel under the shielding effect of the shielding component; when the screening device is in the second screening state, the second end of the shielding component is connected with the second screening plate, so that screened objects at the second screening outlet and the first screening outlet enter the input port of the first conveying channel through the shielding component.

Further, the screening member is disposed above the input port of the first transportation path and the input port of the second transportation path; and/or the screening component is a relaxation screen; and/or the first screening outlet and the second screening outlet are arranged obliquely to the vertical plane.

According to another aspect of the utility model, a sorting system is provided, the sorting system comprises a desliming screen, a dense medium shallow slot sorting machine, a clean coal desliming screen and a gangue desliming screen, and the sorting system further comprises the screening device.

By applying the technical scheme of the utility model, the screening device comprises a screening component, a first conveying component, a second conveying component and a shielding component, wherein the screening component is provided with a first screening outlet and a second screening outlet which are arranged at intervals along a first preset direction, and the grain diameter of the screened material of the first screening outlet is larger than that of the screened material of the second screening outlet; the first transport member has a first transport passage and the second transport member has a second transport passage. When the content of the tail coal in the raw coal is low, the position of the shielding component is adjusted, so that two ends of the shielding component are respectively communicated with the first input port of the first conveying channel and the first screening outlet, the screening device is switched to a first screening state, at the moment, screened matters at the first screening outlet enter the first input port of the first conveying channel through the shielding component, and screened matters at the second screening outlet enter the second input port of the second conveying channel under the shielding effect of the shielding component; when the content of the fine coal in the raw coal is higher, the position of the shielding component is adjusted, the two ends of the shielding component are respectively communicated with the first input port and the second screening outlet of the first conveying channel, and when the screening device is switched to the second screening state, the screening objects at the second screening outlet and the screening objects at the first screening outlet enter the first input port of the first conveying channel through the shielding component, so that the screening objects at the first screening outlet with larger grain size and the screening objects at the second screening outlet with smaller grain size enter the first conveying channel, and then the screening objects are conveyed to the heavy medium shallow slot separator for separation through the first conveying channel, thereby avoiding the problem that the quantity of lump coal entering the heavy medium shallow slot separator is too low when the content of the fine coal in the raw coal is higher, and further solving the problem that the loose screen with fixed mesh size in the prior art cannot be flexibly screened according to the content of the fine coal in the raw coal, so that the raw coal entering selection rate cannot be flexibly adjusted.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

Fig. 1 shows a schematic structural view of an embodiment of a screening device according to the present utility model;

Fig. 2 shows a schematic partial construction of a screening element of a screening arrangement according to the present utility model (in a first screening state);

Fig. 3 shows a schematic view of a part of the screening means of the screening device according to the utility model (in a second screening state).

Wherein the above figures include the following reference numerals:

1. A feed inlet; 2. a discharge port; 10. a screening part; 11. a first screening outlet; 12. a second screening outlet; 13. a housing; 132. a second housing wall; 133. a third shell wall; 14. a first screening plate; 141. a first screening well; 15. a second screening plate; 151. a second screening well; 20. a first transport member; 21. a first transport path; 22. a first input port; 25. a first channel wall; 251. a first channel wall section; 252. a third channel wall section; 26. a second channel wall; 261. a fourth channel wall section; 262. a sixth channel wall section; 30. a second transport member; 31. a second transport path; 32. a second input port; 40. a shielding member; 41. a first end; 42. a second end.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The present utility model provides a screening device, please refer to fig. 1 to 3, comprising: a screening part 10, wherein the screening part 10 is provided with a first screening outlet 11 and a second screening outlet 12 which are arranged at intervals along a first preset direction, and the grain size of the screened material of the first screening outlet 11 is larger than that of the screened material of the second screening outlet 12; a first transport member 20 and a second transport member 30, the first transport member 20 having a first transport channel 21, the second transport member 30 having a second transport channel 31; the screening element 10 is located on the same side of the first inlet 22 of the first transport channel 21 as the second inlet 32 of the second transport channel 31; a shielding member 40, the shielding member 40 being disposed between the first input port 22 of the first transportation path 21, the second input port 32 of the second transportation path 31, the first screening outlet 11 and the second screening outlet 12, the shielding member 40 being adjustably positioned so that the screening apparatus has a first screening state and a second screening state by adjusting the position of the shielding member 40; when the screening device is in the first screening state, two ends of the shielding component 40 are respectively communicated with the first input port 22 and the first screening outlet 11 of the first conveying channel 21, so that screened materials at the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, and screened materials at the second screening outlet 12 enter the second input port 32 of the second conveying channel 31 under the shielding effect of the shielding component 40; when the screening device is in the second screening state, both ends of the shielding member 40 are respectively communicated with the first input port 22 and the second screening outlet 12 of the first transportation path 21, so that screened matters at the second screening outlet 12 and at the first screening outlet 11 enter the first input port 22 of the first transportation path 21 through the shielding member 40.

The screening device comprises a screening component 10, a first conveying component 20, a second conveying component 30 and a shielding component 40, wherein the screening component 10 is provided with a first screening outlet 11 and a second screening outlet 12 which are arranged at intervals along a first preset direction, and the grain size of the screened matters of the first screening outlet 11 is larger than that of the screened matters of the second screening outlet 12; the first transport member 20 has a first transport passage 21 and the second transport member 30 has a second transport passage 31. When the content of the slack coal in the raw coal is low, the position of the shielding component 40 is adjusted so that two ends of the shielding component 40 are respectively communicated with the first input port 22 of the first conveying channel 21 and the first screening outlet 11, the screening device is switched to a first screening state, at the moment, screening out matters at the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, and screening out matters at the second screening outlet 12 enter the second input port 32 of the second conveying channel 31 under the shielding effect of the shielding component 40; when the content of the fine coal in the raw coal is higher, the position of the shielding component 40 is adjusted, so that the two ends of the shielding component 40 are respectively communicated with the first input port 22 and the second screening outlet 12 of the first conveying channel 21, and when the screening device is switched to the second screening state, the screened matters at the second screening outlet 12 and the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, so that the screened matters of the first screening outlet 11 with larger grain size and the screened matters of the second screening outlet 12 with smaller grain size enter the first conveying channel, and then are conveyed to the heavy medium shallow slot separator for separation through the first conveying channel 21, thereby avoiding the problem that the quantity of lump coal entering the heavy medium shallow slot separator is too low when the content of the fine coal in the raw coal is higher, and further solving the problem that the raw coal entering rate cannot be flexibly adjusted due to the fact that the loose-stretch screening with fixed mesh size cannot be flexibly screened according to the content of the fine coal in the raw coal in the prior art, so that the screening device provided by the utility model can reasonably adjust the raw coal entering rate according to the quality of the raw coal, and the economical benefit of a coal mill is improved.

Specifically, the screened material entering the first transportation channel is lump coal, and the screened material entering the second transportation channel is fine coal.

In this embodiment, as shown in fig. 2 and 3, the screening member 10 further includes: the shell 13, the shell 13 includes a first shell wall, a second shell wall 132 and a third shell wall 133 which are connected in sequence, the first shell wall and the third shell wall 133 are arranged oppositely, and the second shell wall 132 is positioned between the first shell wall and the third shell wall 133; the first screening plate 14 and the second screening plate 15, the first screening plate 14 and the second screening plate 15 are disposed in an area surrounded by the first casing wall, the second casing wall 132 and the third casing wall 133; the first screening plate 14 and the second screening plate 15 are arranged at intervals along the first preset direction, the first screening plate 14 is arranged above the second screening plate 15, the first screening plate 14, the first shell wall and the third shell wall 133 jointly enclose a first screening outlet 11, and the first screening outlet 11 and the second shell wall 132 are arranged oppositely; the second screening plate 15 encloses the second screening outlet 12 together with the first and third housing walls 133, the second screening outlet 12 being arranged opposite the second housing wall 132.

Specifically, the first, second and third housing walls 132, 133 together support the first and second screening plates 14, 15, and the first and second screening plates 14, 15 are each adapted to screen the objects to be screened to obtain screened objects and to flow out of the screening member 10 through the first and second screening outlets 11, 12, respectively.

Specifically, the objects to be screened are raw coal, and the first preset direction is the vertical direction shown in fig. 2.

In this embodiment, as shown in fig. 2 and 3, a plurality of first screening holes 141 are provided at intervals on the first screening plate 14, and the first screening holes 141 are communicated with the feed inlet 1 of the screening member 10 for pouring the objects to be screened; a plurality of second screening holes 151 are formed in the second screening plate 15 at intervals; the flow cross section of the first screening hole 141 is larger than that of the second screening hole 151; and/or, enclose into discharge gate 2 between the bottom of first shell wall, the bottom of second shell wall 132 and the bottom of third shell wall 133, discharge gate 2 sets up with second screening board 15 relatively.

Specifically, the discharge port 2 communicates with the second transport passage 31. Pouring the objects to be screened into the screening part 10 from the feed inlet 1, and enabling the screened objects with the particle size larger than the diameter of the first screening holes 141 to flow out of the screening part 10 through the first screening outlet 11; the screened material having a particle diameter larger than the diameter of the second screening hole 151 and smaller than or equal to the diameter of the first screening hole 141 flows out of the screening means 10 through the second screening outlet 12; the screened material having a particle diameter smaller than or equal to the diameter of the second screening hole 151 flows into the second transport path 31 through the discharge port 2.

In this embodiment, as shown in fig. 2 and 3, the aperture of the first screening hole 141 is 25mm and the aperture of the second screening hole 151 is 13mm.

Specifically, the objects to be screened are poured into the screening component 10 from the feed inlet 1, and the screened objects with the particle size of more than 25mm flow out of the screening component 10 through the first screening outlet 11; the screened material with the particle size of more than 13mm and less than or equal to 25mm flows out of the screening member 10 through the second screening outlet 12; the screened material having a particle size of 13mm or less flows into the second transport passage 31 through the discharge port 2.

Specifically, the particle size of the objects to be screened entering the feed inlet 1 is smaller than 150mm; the object to be screened is raw coal.

In this embodiment, as shown in fig. 1, the first transportation component 20 includes a first channel wall 25, where the first channel wall includes a first channel wall section 251, a second channel wall section, and a third channel wall section 252 that are sequentially connected, where the first channel wall section 251 and the third channel wall section 252 are disposed opposite to each other, and the first channel wall section 251, the second channel wall section, and the third channel wall section 252 together enclose a first transportation channel 21; wherein the first end 41 of the shielding member 40 is movably connected with the second channel wall section such that the shielding member 40 is adjustably arranged.

Specifically, the first end 41 of the shielding member 40 is movably connected with the second channel wall section, so that the shielding member 40 can be flexibly adjusted according to the content of the pulverized coal in the raw coal, and the screening device can be flexibly switched between the first screening state and the second screening state; the first channel wall section 251, the second channel wall section and the third channel wall section 252 together enclose the first transportation channel 21, so that the screen out entering from the first input port 22 can be conveyed to the dense medium shallow slot classifier for classification by the first transportation channel 21, wherein the first channel wall section 251 and the third channel wall section 252 are oppositely arranged, and the first channel wall section 251 and the third channel wall section 252 extend along the direction perpendicular to the extending direction of the first transportation channel 21, so that the screen out in the first transportation channel 21 can be prevented from overflowing the first transportation channel by the first channel wall section 251 and the third channel wall section 252, and the excessive low lump coal entering the dense medium shallow slot classifier is further avoided.

In this embodiment, as shown in fig. 1, the second transportation component 30 includes a second channel wall 26, where the second channel wall 26 includes a fourth channel wall segment 261, a fifth channel wall segment, and a sixth channel wall segment 262 that are sequentially connected, the fourth channel wall segment 261 and the sixth channel wall segment 262 are disposed opposite to each other, and the fourth channel wall segment 261, the fifth channel wall segment, and the sixth channel wall segment 262 together enclose a second transportation channel 31; wherein the fourth channel wall section 261 is disposed obliquely to the vertical; the third channel wall section 252 and the sixth channel wall section 262 are connected.

Specifically, the end of the second transport path 31 remote from the screening member 10 communicates with a first conveyor belt for transporting the screened material in the second transport path 31 to the clean coal bin. The fourth channel wall section 261 is disposed obliquely to the vertical plane to facilitate the smooth flow of the screen material in the second transport channel 31 onto the first conveyor below; the fourth channel wall section 261, the fifth channel wall section and the sixth channel wall section 262 together enclose a second transport channel 31 such that the screen output flowing in from the second screening outlet 12 is transported by the second transport channel 31 onto the first conveyor belt; the fourth channel wall section 261 and the sixth channel wall section 262 are disposed opposite to each other, and the fourth channel wall section 261 and the sixth channel wall section 262 extend along a direction perpendicular to the extending direction of the second transportation channel 31, so that the fourth channel wall section 261 and the sixth channel wall section 262 can prevent the screen material in the second transportation channel 31 from overflowing the second transportation channel, and ensure smooth recovery of the screen material in the second transportation channel 31.

In the present embodiment, as shown in fig. 1, the shielding member 40 is a shutter; and/or the shielding member 40 is rotatably provided.

Specifically, the shielding member 40 is a baffle plate, such that when the screening device is in the first screening state, the shielding member 40 can ensure that the screen out at the first screening outlet 11 smoothly enters the first input port 22 of the first transportation path 21, the screen out at the second screening outlet 12 enters the second input port 32 of the second transportation path 31, the screen out at the second screening outlet 12 is blocked from entering the first transportation path 21, and when the screening device is in the second screening state, the screen out at the second screening outlet 12 and the screen out at the first screening outlet 11 can be ensured to enter the first input port 22 of the first transportation path 21.

Specifically, the shielding component 40 is rotatably arranged, so that two ends of the shielding component 40 are respectively communicated with the first input port 22 and the first screening outlet 11 of the first transportation channel 21, or two ends of the shielding component 40 are respectively communicated with the first input port 22 and the second screening outlet 12 of the first transportation channel 21, thereby ensuring smooth switching of the screening device between the first screening state and the second screening state, and further enabling the screening device to flexibly adjust according to the content of the pulverized coal in the raw coal.

In this embodiment, as shown in fig. 1, when the screening device is in the first screening state, the second end 42 of the shielding member 40 is connected to the first screening plate 14, so that the screened material at the first screening outlet 11 enters the first inlet 22 of the first transportation channel 21 via the shielding member 40, and the screened material at the second screening outlet 12 enters the second inlet 32 of the second transportation channel 31 under the shielding action of the shielding member 40; when the screening device is in the second screening state, the second end 42 of the shielding member 40 is connected to the second screening plate 15 such that screened material at the second screening outlet 12 and at the first screening outlet 11 enters the first inlet 22 of the first transportation channel 21 via the shielding member 40.

Specifically, when the content of the slack coal in the raw coal is low, the second end 42 of the shielding member 40 is connected with the first screening plate 14, so that the screening device is switched to the first screening state, the screened material at the first screening outlet 11 enters the first input port 22 of the first transportation channel 21 through the shielding member 40, and the screened material at the second screening outlet 12 enters the second input port 32 of the second transportation channel 31 under the shielding effect of the shielding member 40; when the content of the tail coal in the raw coal is higher, the screening device is switched to a second screening state, the second end part 42 of the shielding part 40 is connected with the second screening plate 15, and the screen out with smaller particle size at the second screening outlet 12 and the screen out with larger particle size at the first screening outlet 11 are all fed into the first input port 22 of the first conveying channel 21 through the shielding part 40 and then conveyed to the dense medium shallow slot separator for separation through the first conveying channel 21, so that the problem that the quantity of lump coal fed into the dense medium shallow slot separator is too low when the content of the tail coal in the raw coal is higher is avoided.

In the present embodiment, as shown in fig. 1, the screening member 10 is disposed above the first input port 22 of the first transport path 21 and the second input port 32 of the second transport path 31; and/or the screening element 10 is a relaxation screen; and/or the first screening outlet 11 and the second screening outlet 12 are arranged obliquely to the vertical.

Specifically, the screening component 10 is disposed above the first input port 22 of the first transportation channel 21 and the second input port 32 of the second transportation channel 31, so that the screened product of the screening component 10 enters the first transportation channel 21 and the second transportation channel 31 under the action of gravity, and the screening component 10 is prevented from being blocked due to the fact that part of screened product remains on the screening component 10.

Specifically, the screening component 10 is a relaxation screen, which further ensures that the screening component 10 can sufficiently screen the objects to be screened.

Specifically, the first screening outlet 11 and the second screening outlet 12 are inclined to the vertical plane, so that the screened material can flow out smoothly from the first screening outlet 11 and the second screening outlet 12 respectively, and the screened material is prevented from blocking the first screening plate 14 and the second screening plate 15.

The utility model provides a sorting system, which is shown in fig. 1, and comprises a desliming screen, a dense medium shallow slot sorting machine, a clean coal desliming screen and a gangue desliming screen, and the sorting system also comprises a screening device in the embodiment.

The sorting system comprises a desliming screen, a dense medium shallow-trough sorter, a clean coal desliming screen, a gangue desliming screen and a screening device in the embodiment, wherein the screening device comprises a screening component 10, a first conveying component 20, a second conveying component 30 and a shielding component 40, the screening component 10 is provided with a first screening outlet 11 and a second screening outlet 12 which are arranged at intervals along a first preset direction, and the grain size of the screened product of the first screening outlet 11 is larger than that of the screened product of the second screening outlet 12; the first transport member 20 has a first transport passage 21 and the second transport member 30 has a second transport passage 31. When the content of the slack coal in the raw coal is low, the position of the shielding component 40 is adjusted so that two ends of the shielding component 40 are respectively communicated with the first input port 22 of the first conveying channel 21 and the first screening outlet 11, the screening device is switched to a first screening state, at the moment, screening out matters at the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, and screening out matters at the second screening outlet 12 enter the second input port 32 of the second conveying channel 31 under the shielding effect of the shielding component 40; when the content of the fine coal in the raw coal is higher, the position of the shielding component 40 is adjusted, so that the two ends of the shielding component 40 are respectively communicated with the first input port 22 and the second screening outlet 12 of the first conveying channel 21, and when the screening device is switched to the second screening state, the screened matters at the second screening outlet 12 and the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, so that the screened matters of the first screening outlet 11 with larger grain size and the screened matters of the second screening outlet 12 with smaller grain size enter the first conveying channel, and then are conveyed to the heavy medium shallow slot separator for separation through the first conveying channel 21, thereby avoiding the problem that the quantity of lump coal entering the heavy medium shallow slot separator is too low when the content of the fine coal in the raw coal is higher, and further solving the problem that the raw coal entering rate cannot be flexibly adjusted due to the fact that the loose-stretch screening with fixed mesh size cannot be flexibly screened according to the content of the fine coal in the raw coal in the prior art, so that the screening device provided by the utility model can reasonably adjust the raw coal entering rate according to the quality of the raw coal, and the economical benefit of a coal mill is improved.

In specific implementation, two desliming sieves are used in parallel, and the mesh size of each desliming sieve is 3mm; the mesh sizes of the clean coal medium removing sieve and the gangue medium removing sieve are 13mm; one end of the first conveying channel 21 far away from the screening component 10 is communicated with a second conveying belt, the second conveying belt conveys screened products to a desliming screen, a discharge port of the desliming screen is communicated with a feed port of a heavy medium shallow slot separator, and a discharge port of the heavy medium shallow slot separator is communicated with a feed port of a clean coal desliming screen and a gangue desliming screen. The method specifically comprises the following steps: 1) Raw coal passes through a screening part 10 to obtain 150-25/13mm lump coal and-25/13 mm fine coal; 2) The screen out of 150-25/13mm is transported to a desliming screen through a second conveyor belt for coal slime removal; 3) The screen out after the coal slime is removed enters a dense medium shallow slot separator for separation to obtain lump clean coal and gangue; 4) The lump clean coal and the gangue enter a clean coal medium removal sieve and a gangue medium removal sieve respectively for medium removal.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

The screening device comprises a screening component 10, a first conveying component 20, a second conveying component 30 and a shielding component 40, wherein the screening component 10 is provided with a first screening outlet 11 and a second screening outlet 12 which are arranged at intervals along a first preset direction, and the grain size of the screened matters of the first screening outlet 11 is larger than that of the screened matters of the second screening outlet 12; the first transport member 20 has a first transport passage 21 and the second transport member 30 has a second transport passage 31. When the content of the slack coal in the raw coal is low, the position of the shielding component 40 is adjusted so that two ends of the shielding component 40 are respectively communicated with the first input port 22 of the first conveying channel 21 and the first screening outlet 11, the screening device is switched to a first screening state, at the moment, screening out matters at the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, and screening out matters at the second screening outlet 12 enter the second input port 32 of the second conveying channel 31 under the shielding effect of the shielding component 40; when the content of the fine coal in the raw coal is higher, the position of the shielding component 40 is adjusted, so that the two ends of the shielding component 40 are respectively communicated with the first input port 22 and the second screening outlet 12 of the first conveying channel 21, and when the screening device is switched to the second screening state, the screened matters at the second screening outlet 12 and the first screening outlet 11 enter the first input port 22 of the first conveying channel 21 through the shielding component 40, so that the screened matters of the first screening outlet 11 with larger grain size and the screened matters of the second screening outlet 12 with smaller grain size enter the first conveying channel, and then are conveyed to the heavy medium shallow slot separator for separation through the first conveying channel 21, thereby avoiding the problem that the quantity of lump coal entering the heavy medium shallow slot separator is too low when the content of the fine coal in the raw coal is higher, and further solving the problem that the raw coal entering rate cannot be flexibly adjusted due to the fact that the loose-stretch screening with fixed mesh size cannot be flexibly screened according to the content of the fine coal in the raw coal in the prior art, so that the screening device provided by the utility model can reasonably adjust the raw coal entering rate according to the quality of the raw coal, and the economical benefit of a coal mill is improved.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be capable of being practiced otherwise than as specifically illustrated and described. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A screening apparatus, comprising:

A screening member (10), the screening member (10) having a first screening outlet (11) and a second screening outlet (12) arranged at intervals along a first preset direction, the particle size of the screen output of the first screening outlet (11) being larger than the particle size of the screen output of the second screening outlet (12);

A first transport member (20) and a second transport member (30), the first transport member (20) having a first transport channel (21), the second transport member (30) having a second transport channel (31); the screening element (10) is located on the same side of a first inlet (22) of the first transport channel (21) and a second inlet (32) of the second transport channel (31);

A shielding member (40), the shielding member (40) being arranged between a first inlet (22) of the first transportation channel (21), a second inlet (32) of the second transportation channel (31), the first screening outlet (11) and the second screening outlet (12), the shielding member (40) being positionally adjustably arranged to provide the screening device with a first screening state and a second screening state by adjusting the position of the shielding member (40);

When the screening device is in the first screening state, two ends of the shielding component (40) are respectively communicated with the first input port (22) of the first conveying channel (21) and the first screening outlet (11), so that screened matters at the first screening outlet (11) enter the first input port (22) of the first conveying channel (21) through the shielding component (40), and screened matters at the second screening outlet (12) enter the second input port (32) of the second conveying channel (31) under the shielding effect of the shielding component (40);

When the screening device is in the second screening state, two ends of the shielding component (40) are respectively communicated with the first input port (22) of the first conveying channel (21) and the second screening outlet (12), so that screened objects at the second screening outlet (12) and the first screening outlet (11) enter the first input port (22) of the first conveying channel (21) through the shielding component (40).

2. A screening arrangement according to claim 1, wherein the screening means (10) further comprises:

The shell (13), the shell (13) comprises a first shell wall, a second shell wall (132) and a third shell wall (133) which are sequentially connected, the first shell wall and the third shell wall (133) are oppositely arranged, and the second shell wall (132) is positioned between the first shell wall and the third shell wall (133);

A first screening plate (14) and a second screening plate (15), wherein the first screening plate (14) and the second screening plate (15) are arranged in an area surrounded by the first shell wall, the second shell wall (132) and the third shell wall (133); the first screening plates (14) and the second screening plates (15) are arranged at intervals along the first preset direction, the first screening plates (14) are arranged above the second screening plates (15), the first screening plates (14) and the first shell wall and the third shell wall (133) jointly enclose a first screening outlet (11), and the first screening outlet (11) and the second shell wall (132) are oppositely arranged; the second screening plate (15) and the first shell wall and the third shell wall (133) jointly enclose a second screening outlet (12), and the second screening outlet (12) and the second shell wall (132) are oppositely arranged.

3. A screening device according to claim 2, wherein the first screening plate (14) is provided with a plurality of first screening holes (141) at intervals, the first screening holes (141) being in communication with the feed opening (1) of the screening means (10) for pouring the objects to be screened; a plurality of second screening holes (151) are formed in the second screening plate (15) at intervals; the flow cross section of the first screening hole (141) is larger than the flow cross section of the second screening hole (151); and/or

The bottom of the first shell wall, the bottom of the second shell wall (132) and the bottom of the third shell wall (133) enclose a discharge hole (2), and the discharge hole (2) and the second screening plate (15) are oppositely arranged.

4. A screening arrangement according to claim 3, wherein the first screening holes (141) have a pore size of 25mm and the second screening holes (151) have a pore size of 13mm.

5. The screening device of claim 1, wherein,

The first transportation component (20) comprises a first channel wall (25), the first channel wall comprises a first channel wall section (251), a second channel wall section and a third channel wall section (252) which are connected in sequence, the first channel wall section (251) and the third channel wall section (252) are oppositely arranged, and the first channel wall section (251), the second channel wall section and the third channel wall section (252) jointly enclose the first transportation channel (21); wherein a first end (41) of the shielding member (40) is movably connected with the second channel wall section such that the shielding member (40) is adjustably arranged.

6. The screening apparatus of claim 5, wherein,

The second transportation component (30) comprises a second channel wall (26), the second channel wall (26) comprises a fourth channel wall section (261), a fifth channel wall section and a sixth channel wall section (262) which are connected in sequence, the fourth channel wall section (261) and the sixth channel wall section (262) are oppositely arranged, and the fourth channel wall section (261), the fifth channel wall section and the sixth channel wall section (262) jointly enclose the second transportation channel (31); wherein the fourth channel wall section (261) is arranged obliquely to the vertical;

The third channel wall section (252) and the sixth channel wall section (262) are connected.

7. A screening arrangement according to any one of claims 1-6, wherein the shielding member (40) is a baffle; and/or the shielding member (40) is rotatably arranged.

8. The screening apparatus of claim 2, wherein,

When the screening device is in the first screening state, the second end (42) of the shielding member (40) is connected with the first screening plate (14) so that screened material at the first screening outlet (11) enters the first input port (22) of the first conveying channel (21) through the shielding member (40) and screened material at the second screening outlet (12) enters the second input port (32) of the second conveying channel (31) under the shielding effect of the shielding member (40);

when the screening device is in the second screening state, the second end (42) of the shielding member (40) is connected to the second screening plate (15) such that screen output at the second screening outlet (12) and at the first screening outlet (11) enters the first inlet (22) of the first transportation channel (21) via the shielding member (40).

9. The screening device according to any one of claims 1 to 6, wherein,

The screening component (10) is arranged above a first input port (22) of the first conveying channel (21) and a second input port (32) of the second conveying channel (31); and/or

The screening component (10) is a relaxation screen; and/or

The first screening outlet (11) and the second screening outlet (12) are arranged obliquely to the vertical plane.

10. A sorting system comprising a desliming screen, a dense medium shallow trench classifier, a clean coal desliming screen and a gangue desliming screen, characterized in that the sorting system further comprises a screening device according to any one of claims 1 to 9.