WO2020186591A1

WO2020186591A1 - Pulsating-type heavy medium shallow slot separating device and method

Info

Publication number: WO2020186591A1
Application number: PCT/CN2019/083663
Authority: WO
Inventors: 桂夏辉; 马子鉴; 邢耀文; 夏阳超; 曹亦俊; 刘炯天
Original assignee: 中国矿业大学
Priority date: 2019-03-15
Filing date: 2019-04-22
Publication date: 2020-09-24
Also published as: CN109731670A; CN109731670B

Abstract

A pulsating-type heavy medium shallow slot separating device, comprising a separating slot body (1), a guiding portion (2), a transmission portion (3), a funnel portion (4), an air valve transmission device (5) and an air chamber (6). The pulsating-type heavy medium shallow slot separating device enhances the effect of separating by means of a pulsating flow of the air chamber, completely disperses and stratifies run-of-mine coal, and precisely stratifies according to density, being able to effectively separate materials of a small granularity level, reducing the lower limit of shallow slot separating, and improving the separating precision of shallow slot separating. In addition, the heavy medium fed into the shallow slot can keep a stable suspension state, improving the utilization rate of the medium, and reducing the medium consumption. In addition, further disclosed is a separating method using the pulsating-type heavy medium shallow slot separating device.

Description

Pulsating type heavy medium shallow groove sorting device and method

Technical field:

The invention relates to a pulsating type heavy medium shallow tank sorting device and method, which is especially suitable for a wider material particle size range, and effectively reduces the medium consumption, so that the sorting accuracy of the heavy medium shallow tank is more stable. Slot sorting device and method.

Background technique:

Dense medium separation is the core separation process of the current coal preparation plant production technology. It is also an important improvement direction for the improvement of the separation accuracy of the heavy medium equipment. At the same time, the medium consumption is the main production cost of the current coal preparation plant. It improves the utilization rate of the heavy medium and reduces Media consumption is an effective way to reduce washing costs.

The original dense medium shallow slot separator has the problem of density instability in the medium system. During the washing process of the heavy medium shallow slot separator, the density of the medium may not reach the set value for a certain period of time. If the density of the medium is too low, a large amount of clean coal will be mixed into the gangue and discharged, resulting in crushing of the shallow groove scraper or blocking the gangue chute. At the same time, because the medium and coal are deposited together, it becomes very difficult to separate the product; if the density of the medium is too high, a large amount of medium coal or gangue will enter the clean coal system, causing the quality of the lump clean coal to decrease. In addition, if the medium system is unstable and the liquid level in the medium barrel is too low, the coal and medium in the separator will also accumulate, causing the scraper at the bottom of the tank to be crushed.

At the same time, the original heavy-medium shallow groove sorting machine only relies on a single rising medium flow, which cannot sufficiently loosely layer the materials and ensure the stable suspension of the suspension, and affect the accurate layering of light and heavy products.

In the original pulsating water media sorting machine, such as the sorting process of the jig machine, the hydrodynamic effect is the main factor affecting the jig sorting. The speed resistance and the additional thrust produced by the hydrodynamic action together determine the quality of the sorting effect, and the speed resistance and the additional resistance have different relative sizes with the jig stroke and stroke combination. If the combination of stroke and stroke is improper, the bed can't be properly loosened and it is difficult to get a good sorting effect.

At the same time, the jigger also has uneven water supply under the sieve. The design of the top water pipe under the screen is only given to the center of the jig, so that the top water will not be evenly distributed along the whole section of the jig, which will affect the sorting effect.

Summary of the invention:

Purpose of the invention: Aiming at the shortcomings of the above technology, to provide a pulsating type heavy medium shallow tank sorting device and method with low medium consumption, high sorting accuracy of light and heavy products, and increasing the washing particle size range of washing equipment.

Summary of the invention: The pulsation type heavy medium shallow tank sorting device of the present invention includes a sorting tank body. The upper part of the sorting tank body is provided with a damper transmission device. The bottom of the sorting tank body is provided with multiple air chambers. The body is provided with a guide part, the guide part is connected with a transmission part arranged at the end of the sorting tank body through a chain, and the bottom of the sorting tank body is provided with a plurality of funnel parts;

The separation tank body has a rectangular parallelepiped structure. The two sides of the separation tank body are respectively provided with a raw coal inlet and a clean coal overflow weir. A horizontal flow inlet is provided below the raw coal inlet, and is located below the transmission part of the end of the separation tank body. With gangue discharge port;

The guide part includes a guide rail arranged around the sorting tank body to match the circular motion track of the chain, and drive the scraper on the chain to perform circular movement, thereby driving the scraper to perform circular movement. , It also includes a head wheel group, a follow-up wheel group and a tail wheel group horizontally arranged above the sorting tank. The head wheel group is arranged above the gangue discharge port, and the follow-up wheel group and the tail wheel group are arranged under the air valve transmission device. , The two ends of the head wheel group, the following wheel group and the tail wheel group are respectively equipped with sprockets, and the sprockets of the head wheel group, the following wheel group and the tail wheel group are respectively equipped with two chains, and there is a space between the two ends of the chain There is a scraper through the connecting plate, the lower end of the chain is embedded in the slide groove of the guide rail, the chain moves in the guide rail, and drives the scraper on the chain to move in a circular motion. The sinker sinking to the bottom of the sorting tank moves through the curve of the scraper. Scrape the bottom sediment, lift the bottom sediment to the gangue discharge port at the end of the tank, and discharge the gangue;

The transmission part includes a motor, a reducer, and a V-belt, wherein the motor is connected to the reducer through the V-belt, and the reducer is connected to the head wheel assembly to provide power for the curved movement of the guiding part;

The air chamber has a hollow structure, the lower side of the air chamber is provided with an air chamber lower hole, the upper side of the air chamber is provided with an air chamber upper hole, and the top of the air chamber is provided with a plurality of air chamber top holes arranged side by side, wherein the air chamber upper hole It is connected with the air valve transmission device through the pipeline, the lower hole of the air chamber is connected with the funnel part through the pipeline, and the top hole of the air chamber is set vertically;

The damper transmission device is a compressed air generating device.

A pulsating type heavy-medium shallow tank sorting method, the steps are:

Feed the raw coal into the sorting tank body through the raw coal inlet, and enter the horizontal flow evenly along the full width of the sorting tank body through the horizontal inlet, and feed the medium flow to the lower holes of all air chambers through the funnel part, and drive through the air valve. The device feeds compressed air with periodically changing air volume to the upper holes of the air chambers of all air chambers. After the compressed air and the medium flow are mixed in the air chamber, the intermittent compressed air body passed through the air valve drive device drives the medium flow from The top hole of the air chamber makes a vertical alternating motion. When the air volume increases, the compressed air medium flow vertically upwards, the air volume decreases, the compressed air medium flow vertically downwards, the air volume periodically changes, and the compressed air medium flow periodically increases or Falling, horizontal flow and vertical alternating pulse movement of the medium flow achieve sufficient dispersion and stratification of the raw coal, and the separation according to density is beneficial to the floating of the clean coal. The separated clean coal overflows from the clean coal along the horizontal flow direction The gangue is discharged from the weir, and the sorted gangue is lifted to the end of the sorting tank by two continuously movable scrapers, and discharged through the gangue discharge port, forming the whole process of separating clean coal and gangue.

Beneficial effects: The invention is equipped with an air chamber, and the pulsating flow of the air chamber strengthens the separation effect. Compared with the single upflow of the traditional shallow trough, the raw coal is more fully dispersed and stratified, and the density is more accurately stratified. Smaller particle size materials can be effectively sorted, so the lower limit of shallow slot sorting is reduced, and the sorting accuracy of shallow slot sorting machine is improved. At the same time, the heavy medium fed into the shallow tank can maintain a stable suspension state, increase the utilization rate of the medium, and reduce the medium consumption.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a pulsating type heavy medium shallow tank sorting device of the present invention;

Figure 2 is a plan view of the pulsating type heavy medium shallow groove sorting device of the present invention;

Figure 3 is a top view of the pulsating type heavy medium shallow tank sorting device of the present invention;

Figure 4 is a schematic diagram of the air chamber structure of the present invention.

In the picture: 1-sorting trough body, 2-guide part, 3-transmission part, 4-funnel part, 5-air valve transmission device, 6-air chamber, 7-head wheel group, 8-follow wheel group, 9 -Tail wheel set, 10-chain, 11- gangue discharge port, 12- scraper, 13- guide rail, 14- connecting plate, 15- motor, 16- triangle belt, 17- reducer, 18- raw coal inlet, 19 -Clean coal overflow weir, 20-horizontal inlet, 21-upper hole of air chamber, 22-lower hole of air chamber, 23-top hole of air chamber.

detailed description:

The implementation of the present invention will be further described below in conjunction with the drawings.

As shown in Figures 1 and 2, the pulsation type heavy medium shallow tank sorting device of the present invention is characterized in that it includes a sorting tank body 1, and a damper transmission device 5 is arranged above the sorting tank body 1. The bottom of the tank body 1 is provided with a plurality of air chambers 6, and the sorting tank body 1 is provided with a guide part 2, and the guide part 2 is connected with a transmission part 3 provided at the end of the sorting tank body 1 through a chain 10. A plurality of funnel parts 4 are provided at the bottom of the tank 1;

The separation tank body 1 has a rectangular parallelepiped structure. Both sides of the separation tank body 1 are provided with a raw coal inlet 18 and a clean coal overflow weir 19, respectively. Below the raw coal inlet 18, a horizontal inflow inlet 20 is provided. A gangue discharge port 11 is provided below the end transmission part 3;

The guide portion 2 includes a guide rail 13 arranged around the sorting tank 1 to match the circular motion track of the chain 10 and drive the scraper on the chain 10 to perform circular movement, thereby driving the scraper to perform circular movement. , Also includes a head wheel set 7, a follow-up wheel set 8 and a tail wheel set 9 transversely arranged above the sorting tank 1, wherein the head wheel set 7 is set above the gangue discharge port 11, and the follow-up wheel set 8 and the tail wheel set 9 is set under the air valve transmission device 5. The head wheel group 7, the follower wheel group 8 and the tail wheel group 9 are respectively provided with sprockets at both ends. The sprockets of the head wheel group 7, the follower wheel group 8 and the tail wheel group 9 Two chains 10 are respectively provided on the upper part. The upper interval between the two ends of the chain 10 is provided with a scraper 12 through the connecting plate 14. The lower end of the chain 10 is embedded in the guide rail chute, and the chain 10 moves in the guide rail 13 to drive the chain 10 The scraper moves in a circular motion, and the sediment sinking to the bottom of the sorting tank 1 scrapes the bottom sediment through the curved movement of the scraper 12, and lifts the bottom sediment to the gangue discharge port at the end of the tank to discharge the gangue;

As shown in Figure 3, the transmission part 3 includes a motor 15, a reducer 17, and a V-belt 16. The motor 15 is connected to the reducer 17 through the V-belt 16, and the reducer 17 is connected to the head wheel set 7, which is Guiding part 2 provides power for curved movement;

As shown in Figure 4, the air chamber 6 is a hollow structure, the lower side of the air chamber 6 is provided with an air chamber lower hole 22, the upper side of the air chamber 6 is provided with an air chamber upper hole 21, and the top of the air chamber 6 is provided with multiple side-by-side The top hole 23 of the air chamber is provided, wherein the upper hole 21 of the air chamber is connected with the air valve transmission device 5 through a pipeline, the lower hole 22 of the air chamber is connected with the funnel part 4 through a pipeline, and the top hole 23 of the air chamber is vertically arranged;

The damper actuator 5 is a compressed air generating device.

A pulsating type heavy-medium shallow tank sorting method, the steps are:

Feed the raw coal into the sorting tank body 1 through the raw coal inlet 18, and evenly enter the horizontal flow along the full width to the sorting tank body 1 through the horizontal inlet 20, and feed it into the lower air chambers 22 of all air chambers 6 through the funnel part 4 The medium flow, through the air valve transmission device 5, feeds compressed air whose air volume changes periodically to the upper holes 21 of the air chambers 6 of the air chamber. After the compressed air and the medium flow are mixed in the air chamber 6, they pass through the air valve transmission device 5 The intermittent compressed air body is introduced to push the medium flow from the top hole 23 of the air chamber to make a vertical alternating motion. When the air volume increases, the compressed air medium flow vertically upwards, the air volume decreases, and the compressed air medium flow vertically downwards. Periodically change, the compressed air medium flow will periodically rise or fall. The horizontal flow and the medium flow of vertical alternating pulse motion realize the sufficient dispersion and stratification of the raw coal, and the separation according to density is beneficial to the floating of the clean coal. After separation The cleaned coal is discharged from the cleaned coal overflow weir 19 along the horizontal flow direction, and the sorted gangue is lifted to the end of the sorting tank 1 through the two continuously movable scrapers 12, and discharged through the gangue discharge port 11. , Into the entire process of separation and separation of clean coal and gangue.

Working process, raw coal is fed from one side of the tank body, the raw coal and the medium suspension are mixed, and then sorted through the tank body. Under the combined action of horizontal flow and pulsating water flow, the density is sorted, and the float is transported by the horizontal flow. When the overflow weir is discharged, the sediment at the bottom of the tank is lifted to the head of the tank through the curved movement of the scraper and falls into the gangue chute. During the working process, the heavy medium is fed in by two parts, and the other is fed from the funnel at the bottom of the tank, which accounts for about 10% to 20% of the heavy medium. This way forms a pulsating medium flow, which promotes the suspension of the suspension and is beneficial to The clean coal and the suspension are fully mixed and stratified according to the density to achieve the floating of the clean coal; the other part is evenly distributed along the full width of the feed opening, accounting for about 80% to 90% of the total medium volume, resulting in a horizontal medium The floating clean coal flows uniformly to the discharge port under the promotion of the horizontal medium flow, and discharges from the separator along with the medium flow to complete the separation of the raw coal.

Compared with the conventional shallow groove sorting machine, the present invention changes the original single upward flow, and alternately feeds compressed air through the air chamber at the bottom to form a pulsating medium flow. Under the action of the pulsating flow, it can make The properties of the suspension are more stable, which solves the problem of uneven distribution of the density of the medium system. At the same time, under the combined action of heavy medium and hydrodynamics, it can realize the separation of raw coal together, further improve the separation accuracy of the equipment, and improve the recovery of clean coal. rate. Experiments show that under the same sorting situation, the medium consumption will be lower, the sorting accuracy of the sorting machine is higher, and the lower limit of sorting is also reduced.

Claims

A pulsating type heavy medium shallow tank sorting device, which is characterized in that it comprises a sorting tank body (1), a damper transmission device (5) is arranged above the sorting tank body (1), and the sorting tank body (1) ) Is provided with a plurality of air chambers (6) at the bottom of the inside, a guide part (2) is provided in the sorting tank body (1), and the guide part (2) is connected to the sorting tank body (1) through a chain (10). ) At the end of the transmission part (3), there are multiple funnel parts (4) at the bottom of the sorting tank body (1);

The separation tank body (1) has a rectangular parallelepiped structure. Both sides of the separation tank body (1) are provided with a raw coal inlet (18) and a clean coal overflow weir (19), and a horizontal coal inlet (18) is provided below the raw coal inlet (18). The inflow port (20) is provided with a gangue discharge port (11) below the end transmission part (3) of the sorting tank body (1);

The guide part (2) includes a guide rail (13) set around the sorting tank (1) to match the circular motion track of the chain (10), and drive the scraper on the chain (10) to perform circular motion, Thereby driving the scraper to make a circular motion. , It also includes a head wheel group (7), a follower wheel group (8) and a tail wheel group (9) which are transversely arranged above the sorting tank body (1), wherein the head wheel group (7) is arranged at the gangue discharge port ( 11) Above, the following wheel group (8) and the tail wheel group (9) are arranged below the air valve transmission device (5), and the two wheels of the head wheel group (7), the following wheel group (8) and the tail wheel group (9) There are sprocket wheels respectively at the ends, and two chains (10) are provided on the sprockets of the head wheel group (7), the follower wheel group (8) and the tail wheel group (9). The interval is provided with a scraper (12) through the connecting plate (14), the lower end of the chain (10) is embedded in the guide rail chute, and the chain (10) moves in the guide rail (13) to drive the scraper on the chain (10) to make a circle Movement, the sediment sinking to the bottom of the sorting tank (1) scrapes the bottom sediment through the curved movement of the scraper (12), lifts the bottom sediment to the gangue discharge port at the end of the tank, and discharges the gangue;

The transmission part (3) includes a motor (15), a reducer (17), and a V-belt (16), wherein the motor (15) is connected to the reducer (17) through the V-belt (16), and the reducer (17) ) Is connected with the head wheel group (7) to provide power for the curved movement of the guiding part (2);

The air chamber (6) is a hollow structure, the lower side of the air chamber (6) is provided with an air chamber lower hole (22), the upper side of the air chamber (6) is provided with an air chamber upper hole (21), and the air chamber (6) The top is provided with a plurality of air chamber top holes (23) arranged side by side, wherein the upper hole (21) of the air chamber is connected to the air valve transmission device (5) through a pipeline, and the lower hole (22) of the air chamber is connected to the funnel through the pipeline The parts (4) are connected, and the top hole (23) of the air chamber is set vertically;

The air valve transmission device (5) is a compressed air generating device.
A sorting method using the pulsating type heavy medium shallow groove sorting device according to claim 1, characterized in that the steps are:

Feed the raw coal into the sorting tank body (1) through the raw coal inlet (18), and evenly enter the horizontal flow along the full width to the sorting tank body (1) through the horizontal flow inlet (20), and to all air through the funnel part (4) The lower hole (22) of the air chamber of the chamber (6) feeds the medium flow, and the compressed air whose air volume changes periodically to the upper holes (21) of the air chambers (6) through the air valve transmission device (5) After the compressed air and the medium flow are mixed in the air chamber (6), the intermittent compressed air body passed in through the air valve transmission device (5) pushes the medium flow to make a vertical alternating motion from the top hole of the air chamber (23). The air volume increases, the compressed air medium flow vertically upwards, the air volume decreases, the compressed air medium flow vertically downwards, the air volume periodically changes, the compressed air medium flow periodically rises or falls, horizontal flow and vertical alternating pulse motion The medium flow of the raw coal is fully dispersed and stratified, separated by density, which is conducive to the floating of the clean coal. The separated clean coal is discharged from the clean coal overflow weir (19) in the direction of the horizontal flow. The gangue is lifted to the end of the sorting tank body (1) through two continuously movable scrapers (12), and discharged through the gangue discharge port (11), forming the entire clean coal and gangue sorting and separation process.