Novel medium drainage fixed screen

Abstract

The utility model discloses a novel fixed screen for medium drainage, which comprises a shell and a blowpipe, the top of the shell is provided with a storage tank, a sieve plate and a secondary sieve plate which are obliquely arranged from high to low, the side edges of the storage tank, the sieve plate and the secondary sieve plate are all fixed with the inner wall of the shell, the top edge of the storage tank is aligned with the sieve plate, and the sieve plate is aligned with the secondary sieve plate; the air blowing pipe is arranged above the first-stage sieve plate and the second-stage sieve plate and located at the high end, a plurality of obliquely downward air outlets are formed in the air blowing pipe, the air outlet of the first-stage sieve plate faces the low end of the first-stage sieve plate, and the air outlet of the second-stage sieve plate faces the low end of the second-stage sieve plate. The device has the advantages that a small part of clean coal is temporarily stored in the storage tank, most falling clean coal firstly impacts the clean coal in the storage tank, the inclination of the first-stage sieve plate and the second-stage sieve plate is reduced to 6 degrees, the scouring force of the clean coal is relieved, and the service life of the sieve plates is prolonged; meanwhile, the blowpipe blows the sieve plate, so that sieve holes are prevented from being blocked, and the influence on medium drainage is reduced.

Description

Technical field:

[0001] The utility model relates to the field of screening, in particular to a novel medium removal fixed screen. Background technology:

[0002] In a coal washing plant, coal is usually screened into clean coal through a shallow trough heavy medium separator. After screening, the clean coal must be passed through a fixed medium removal screen to remove the liquid medium. The fixed medium removal screen includes a shell, a blind plate and a sieve plate designed to be inclined at 20 degrees on the top of the shell, and the sieve hole diameter of the sieve plate is 1mm. When in use, the clean coal first reaches the blind plate, and then slides through the sieve plate along the inclination, and the liquid medium flows downward.

[0003] The following problems occurred during actual use:

[0004] 1. When the clean coal passes through the fixed screen for de-mediation, due to the relatively large angle of the fixed screen, after the clean coal hits the blind plate, the horizontal coal flow flows rapidly, strongly scouring the screen plate, causing the screen plate to be worn and damaged particularly severely. A large amount of manpower is consumed every day to check the wear of the screen plate and replace the damaged screen plate.

[0005] 2. The sieve hole diameter of the fixed screen plate is small. The raw coal produced underground contains a large amount of edge hair, and a large amount of edge hair will be mixed into the medium, causing the sieve holes of the fixed screen plate to be blocked. The medium cannot effectively pass through the sieve holes of the fixed screen, and the medium recovery is affected. Utility model content:

[0006] The utility model aims to provide a novel medium removal fixed screen.

[0007] The utility model is implemented by the following technical solutions:

[0008] A novel medium-removing fixed screen comprises a shell and a blow pipe. The top of the shell is provided with a material storage trough, a first sieve plate, and a second sieve plate arranged obliquely from high to low. The sides of the material storage trough, the first sieve plate, and the second sieve plate are all fixed to the inner wall of the shell. The top edge of the material storage trough is aligned with the first sieve plate, and the first sieve plate is aligned with the second sieve plate.

[0009] The blow pipe is placed above the first sieve plate and the second sieve plate and is located at the high end. The blow pipe is provided with a plurality of air outlets inclined downward. The air outlet of the first sieve plate faces the lower end of the first sieve plate, and the air outlet of the second sieve plate faces the lower end of the second sieve plate.

[0010] Preferably, it also includes an air compressor, a ball valve, and a solenoid valve. The outlet of the air compressor is connected to the two solenoid valves respectively through the ball valve, and the two solenoid valves are also connected to the two blowing pipes respectively.

[0011] Preferably, the material storage trough includes a bottom plate and a rectangular frame, the bottom plate is movably placed at the bottom of the rectangular frame; a hydraulic cylinder is provided under the bottom plate, the telescopic end of the hydraulic cylinder is fixed to the bottom of the bottom plate, and the fixed end of the hydraulic cylinder is fixed to the inner wall of the shell.

[0012] Advantages of the utility model:

[0013] 1. The inclination of the storage trough, the first screen plate and the second screen plate is changed from 20 degrees to 6 degrees to slow down the slope; when the coal flows down, a small part is first stored in the storage trough, and then the clean coal impacts the clean coal in the storage trough, reducing the direct impact of the coal flow on the blind plate or the first screen plate and the second screen plate. Then, according to the principle that coal floats in qualified media, most of the other clean coal flows over the storage trough and slowly flows down along the slope of the first screen plate and the second screen plate, and the gentle slope flow rate is also slowed down, which greatly reduces the damage cycle of the first screen and the second screen plate.

[0014] 2. High-pressure wind blows from the air outlet toward the sieve holes of the first and second sieve plates along the flow direction of the clean coal. The medium flow can pass through the sieve holes under the action of wind force, and the probability of clogging of the sieve holes is greatly reduced. Description of the drawings:

[0015] 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.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the utility model in use.

[0018] In the figure: housing 1, air blowing pipe 2, material storage tank 3, primary sieve plate 4, secondary sieve plate 5, air outlet 6, air compressor 7, ball valve 8, solenoid valve 9, bottom plate 10, rectangular frame 11, hydraulic cylinder 12. Specific implementation method:

[0019] 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.

[0020] like Figure 1 , Figure 2 As shown, a novel medium-removing fixed screen comprises a shell 1 and a blow pipe 2. A storage tank 3, a first sieve plate 4 and a second sieve plate 5 are arranged obliquely from high to low on the top of the shell 1. The sides of the storage tank 3, the first sieve plate 4 and the second sieve plate 5 are fixed to the inner wall of the shell 1. The top edge of the storage tank 3 is aligned with the first sieve plate 4, and the first sieve plate 4 is aligned with the second sieve plate 5. A baffle can be fixedly installed on the side of the top of the shell 1 to prevent the clean coal from being scattered. The clean coal enters the top of the shell 1 of the device, passes through the storage tank 3, the first sieve plate 4 and the second sieve plate 5 in sequence, and flows out with the inclination. , the inclination of the storage trough 3, the first sieve plate 4, and the second sieve plate 5 is changed from 20 degrees to 6 degrees, slowing down the slope; when the coal flows down, a small part is first stored in the storage trough 3, and then according to the principle that coal floats in qualified media, most of the other clean coal can turn over the side of the storage trough 3 and slowly flow down along the first sieve plate 4 and the second sieve plate 5. The subsequent clean coal impacts the clean coal in the storage trough 3, reducing the impact of the coal flow directly on the blind plate or the first sieve plate 4 and the second sieve plate 5, and the gentle slope flow rate is also slowed down, which greatly reduces the damage cycle of the first sieve plate 4 and the second sieve plate 5;

[0021] The blowing pipe 2 is placed above the first sieve plate 4 and the secondary sieve plate 5, and is located at the high end. A plurality of downwardly inclined air outlets 6 are provided on the blowing pipe 2. The air outlet 6 of the first sieve plate 4 faces the lower end of the first sieve plate 4, and the air outlet 6 of the secondary sieve plate 5 faces the lower end of the secondary sieve plate 5. The blowing pipe 2 is externally connected to high-pressure wind, and the wind blows from the air outlet 6 to the sieve holes of the first sieve plate 4 and the secondary sieve plate 5 along the flow direction of the clean coal. The wind pressure can be preferably 0.7MPa. The medium flow can pass through the sieve holes under the action of wind force, and the probability of clogging the sieve holes is greatly reduced.

[0022] It also includes an air compressor 7, a ball valve 8, and a solenoid valve 9. The outlet of the air compressor 7 is connected to two solenoid valves 9 through the ball valve 8. The two solenoid valves 9 are also connected to two blowing pipes 2 respectively. External high-pressure air can be provided by the air compressor 7. When the ball valve 8 is opened, the high-pressure air of the air compressor 7 forms high-pressure wind and is blown into the two blowing pipes 2 through the pipeline. The solenoid valve 9 is used to adjust the air volume and air pressure.

[0023] The storage tank 3 includes a bottom plate 10 and a rectangular frame 11, and the bottom plate 10 is movably placed at the bottom of the rectangular frame 11; a hydraulic cylinder 12 is provided below the bottom plate 10, and the telescopic end of the hydraulic cylinder 12 is fixed to the bottom of the bottom plate 10, and the fixed end of the hydraulic cylinder 12 is fixed to the inner wall of the shell 1. After screening, the telescopic end of the hydraulic cylinder 12 drives the bottom plate 10 to lift, so that the clean coal in the storage tank 3 can also roll down along the first sieve plate 4 and the secondary sieve plate 5.

[0024] Working principle: When the utility model is in use, clean coal enters the top of the shell 1 of the device, and a small part of the clean coal is first stored in the storage tank 3, and the other clean coal impacts the clean coal in the storage tank 3. Then, according to the principle that coal floats in qualified media, most of the other clean coal turns over the side of the storage tank 3 and slowly flows down along the first sieve plate 4 and the second sieve plate 5 at an angle. At the same time, high-pressure wind blows from the air outlet 6 to the sieve holes of the first sieve plate 4 and the second sieve plate 5 along the flow direction of the clean coal, and the medium flow can pass through the sieve holes under the action of wind force.

[0025] 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

1. A new type of fixed screen for removing media, characterized in that: It comprises a shell and a blow pipe, wherein the top of the shell is provided with a material storage trough, a first sieve plate, and a second sieve plate arranged obliquely from high to low, the sides of the material storage trough, the first sieve plate, and the second sieve plate are all fixed to the inner wall of the shell, the top edge of the material storage trough is aligned with the first sieve plate, and the first sieve plate is aligned with the second sieve plate; The blow pipe is placed above the first sieve plate and the second sieve plate and is located at the high end. The blow pipe is provided with a plurality of air outlets inclined downward. The air outlet of the first sieve plate faces the lower end of the first sieve plate, and the air outlet of the second sieve plate faces the lower end of the second sieve plate.

2. A novel medium removal fixed screen according to claim 1, characterized in that: It also includes an air compressor, a ball valve, and a solenoid valve. The outlet of the air compressor is connected to the two solenoid valves through the ball valve, and the two solenoid valves are also connected to the two blowing pipes respectively.

3. A novel medium removal fixed screen according to claim 2, characterized in that: The material storage tank includes a bottom plate and a rectangular frame, wherein the bottom plate is movably placed at the bottom of the rectangular frame; a hydraulic cylinder is arranged below the bottom plate, wherein the telescopic end of the hydraulic cylinder is fixed to the bottom of the bottom plate, and the fixed end of the hydraulic cylinder is fixed to the inner wall of the shell.

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