CN204412437U - A kind of dry method dense medium separation bed - Google Patents

Abstract

The utility model provides a dry heavy medium separation bed, which is specially used for a dry heavy medium separation machine. The dry heavy medium separation machine includes a medium drum screen at the floating object end, a dust collector pipeline, and a medium drum screen at the sinking object end. And magnetic separator; wherein the medium drum screen at the floating end and the medium drum screen at the sinking end are set under the floating discharge end and the sinking discharge end of the dry dense medium separator; on the top of the dry dense medium separator Dust collector pipes are installed; dust suction pipes are installed at the floating side media drum screen, the sinking side media drum screen and the magnetic separator, and the whole system is in a fully closed working state. The sorting bed can not only solve the problem of unstable fluidized density and uneven air distribution in the fluidization process, but also the low efficiency of the existing media removal screen for the removal of fine-grained materials, and the magnetic medium content of the fine-grained materials after removal. It can also achieve a significant increase in the removal efficiency of fine-grained materials.

Description

A dry dense medium separation bed

technical field

The utility model belongs to the field of dry mineral separation, in particular to a dry dense medium separation bed, which is especially suitable for the separation of coal and other minerals with different densities, and belongs to solid separation equipment.

Background technique

At present, the dry dense medium separators used in industrial production at home and abroad are mainly wind jigs and wind shakers. Using air instead of water as the sorting medium has poor sorting effect, low production capacity, and requires strong wind, which has been gradually eliminated.

Since the 1960s, scholars such as Douglas E in the United States and Beeckmans J M in Canada have successively carried out research on dry separation of ordinary gas-solid fluidized beds. The separation principle is to use fine particle materials (such as magnetite powder) As a weighting substance, under the action of a uniform updraft, a gas-solid two-phase fluidized bed with a certain density is formed, and the selected materials (such as coal) are fed into the bed and stratified according to the density of the fluidized bed to achieve separation. However, because these scholars only based on the material replacement principle of the upper fluidized bed reactor in the chemical industry, they did not conduct in-depth research on the dense phase high-density fluidization characteristics suitable for coal separation (such as air flow distributors, weighted particle size gradation, etc.), and failed to Realize industrialization.

Since the 1980s, China University of Mining and Technology has been engaged in the research of fluidized dry coal preparation, and developed dry separation technology and equipment based on gas-solid two-phase flow. Utilize the fluidization gas and the aggravated substance (such as magnetite powder) with a certain particle size to form a dense-phase fluidized bed, and the selected materials are subjected to the buoyancy of the overall density of the fluidized bed in the gas-solid two-phase fluidized bed layer, according to The bed density is stratified, the materials smaller than the bed density float up, and the materials larger than the bed density sink, so as to realize the effective separation of the selected materials. The fluidized bed for gas-solid-heavy medium separation provides a new way of high-efficiency dry clean separation for coal in the world, and has broad application prospects and great application value. Since Tangshan Shenzhou Machinery Co., Ltd. began to study the theory and separation process of dry dense medium separation in 2006, after analyzing a large amount of research data of dry dense medium separation, it has successfully developed a new generation of dry dense medium separation. Selected device, and successfully applied to industrialization.

However, there are the following problems in the previous research on the dry dense medium separator: the fluidized density is unstable and the air flow distribution is not uniform during the fluidization process, so it is difficult to improve the separation accuracy and efficiency of the difficult-to-separate coal; There are problems such as the low removal efficiency of the fine-grained material by the removal screen, and the high magnetic medium content of the fine-grained material after removal, so that the removal efficiency of the fine-grained material cannot be improved.

Utility model content

In order to solve the problems existing in the prior art, the utility model proposes a dry dense medium separation bed, which can not only solve the problems of unstable fluidized density and The problems of uneven distribution of air flow, low removal efficiency of fine-grained materials by the existing removal screen, and high magnetic medium content of fine-grained materials after removal can also significantly improve the removal efficiency of fine-grained materials.

According to the technical scheme of the utility model, a dry heavy medium separation bed is provided, which is specially used for a dry heavy medium separation machine. The medium trommel screen and magnetic separator at the object end; the medium trommel screen at the floating end and the medium trommel at the sinking end are set under the floating discharge end and the sinking discharge end of the dry heavy medium separator; There is a dust collector pipe on the top of the medium separator; dust suction pipes are installed at the medium drum screen at the floating end, the media drum screen at the sinking end, and the magnetic separator, and the whole system is in a fully closed working state.

Wherein, the dry dense medium separator further includes an air bag, a Roots blower and a high-pressure air pipe that constitute the air supply system of the dry dense medium separator. The dry heavy medium separation bed is equipped with a double-chain scraper conveying device, which rotates counterclockwise at different speeds.

Preferably, the upper chain scraper conveying device in the double-chain scraper conveying device is used to push the feed material to move to the left; the lower chain scraper conveying device in the double-chain scraper conveying device is used to discharge the sunken material from the tailing coal end . The upper space inside the sorting host is under negative pressure.

More preferably, a conveying device is provided for the products on the screen to be transported to a designated position by the conveying device after the trommel screen is de-intermed; The chute returns to the sorting host.

Further, a double-chain chain plate discharge device is adopted. The dry dense medium separation bed is equipped with a gas distributor. The gas distributor is a steel-based fiber composite distributor or a two-stage composite gas distributor with large pressure drop. The two-stage composite large pressure drop gas distributor is composed of a steel-based porous guard plate and a wire mesh pressed plate or woven fabric.

Therefore, the dry dense medium separation bed of the present utility model is aimed at the fluidized separation bed that uses heavy medium and coal powder mixed medium for high-precision separation of difficult-to-separate coal and the like, which can overcome the existing technology. Insufficiencies such as unstable fluidized density and uneven airflow distribution, so as to improve the separation accuracy and efficiency of difficult coal separation. It further overcomes the problems of low de-medium removal efficiency of the fine-grained material by the existing de-medium sieve, high magnetic medium content of the fine-grained material after de-medium removal, etc., and improves the de-medium removal efficiency of the fine-grained material. Using the dry heavy medium separation bed of the utility model, the material to be sorted is effectively stratified according to the high and low density fluidization in the gas-solid two-phase flow bed layer of high pressure gas and heavy medium to realize separation.

Description of drawings

Figures 1-1 to 1-3 are the front view, left view and top view of the dry-process dense medium separator according to the utility model respectively.

view.

Fig. 2 is a process flow diagram of the dry-process dense medium separator according to the utility model.

Fig. 3 is a schematic structural diagram of a dense medium sorting host in a dry dense medium sorting machine according to the present invention.

Figure 4-1 is a schematic diagram of the stainless steel grate screen in the dry dense medium separation mechanism.

Figure 4-2 is a schematic diagram of the longitudinal section of the stainless steel grate screen in the dry dense medium separation mechanism.

Figure 4-3 is a transverse cross-sectional view of the stainless steel grate screen in the dry dense medium separation mechanism.

Figure 5-1 is the front view of the cleaning mechanism of scraper and pinch wheel.

Figure 5-2 is the left side view of the scraper pressure wheel.

Figure 6-1 is the front view of the wear block parts of the scraper machine.

Figure 6-2 is a cross-sectional view of the wear block of the scraper machine.

Figure 7-1 is the right view of the scraper.

Figure 7-2 is the front view of the scraper.

Figure 8-1 is a detailed schematic diagram of the high-pressure air chamber.

Figure 8-2 is a detailed schematic diagram of another high-pressure air chamber.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Aiming at the problems existing in the prior art, the inventor of the utility model further carries out basic research and development and experimental development on the research and development of a new generation of dry-process heavy-media sorting machine, mainly in the following aspects:

(1) Laboratory basic research and model test

Based on years of research accumulation, laboratory basic research and model tests have been carried out on the dry heavy medium fluidized bed, the dry separation theory of dense phase high-density gas-solid fluidization has been established, and the air distribution and wide particle size weighted mass separation theory has been proposed. Based on the principle of gradation, a kinetic model for the separation of wide-screened multi-component materials in a dense-phase high-density gas-solid fluidized bed was established.

(2) Development of a new generation of dry dense medium fluidized bed dry dense medium separator

Based on theoretical research, model test and pilot test, a new generation of dry dense medium fluidized bed separator was developed. Based on the special process requirements, according to the principle of pressure drop center and the idea of low fluidization number and large pressure drop composite air distribution, the key components and overall structure of the dry-process dense medium separator are optimized and innovated.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Figures 1-1 to 1-3 are respectively the front view, left view and top view of the dry-process dense medium separator according to the present invention. Each of the reference signs specifically indicates: 1 wind bag, 2 floating medium drum screen, 3 dust collector pipe, 4 material inlet, 5 heavy medium separation host, 6 magnetic separator, 7 bag dust collector, 8 medium bucket Hoist, 9 Roots blower, 10 bag filter induced draft fan, 11 medium trommel screen at the sinking end, 12 high-pressure air pipe.

There is a certain amount of medium in the discharged product of the dry heavy medium separator, so the medium trommel 2 at the floating end and the medium trommel 11 at the sinking end are set at the floating discharge end and the sinking end of the dry heavy medium separator. Below the discharge end, it is used to separate the sorting product from the medium.

In order to prevent the dust from polluting the environment during the working process of the dry dense medium separator, a bag filter 7 is used to remove dust, and a dust collector pipe 3 is installed on the top of the dry dense medium separator, and the suction volume is greater than that of the dry dense medium separator. The air supply volume of the separator is in a negative pressure state inside the machine, so that the dust in the dry-type dense medium separator does not escape. 11 and the magnetic separator 6 etc. are provided with dust suction pipes, and the whole system is in a fully enclosed working state.

The air bag 1, Roots fan 9 and high-pressure air pipe 12 form the air supply system of the dry-process dense medium separator, which provides a stable air source for the dry-process dense medium separator when it is working.

Fig. 2 is a process flow diagram of the dry-process dense medium separator according to the utility model. When using a dry heavy medium separator, it mainly includes the following steps:

In the first step, the 6-100mm grade coal enters the dry dense medium separator, and the dense medium also enters the dry dense medium separator. The feed of the dry dense medium separator is along the width of the dry dense medium separator. Feed evenly, the feeding amount and the amount of heavy medium added should be continuously adjustable.

In the second step, the air supply system is composed of a Roots blower, an air bag and several air ducts. Compressed air is provided, and the dense medium is in a certain ratio to form a gas-solid two-phase fluidized bed layer, thereby realizing layered separation of different densities.

In the third step, there is a certain amount of medium in the discharged product of the dry heavy medium separator, so a medium drum screen is installed and placed under the discharge end of the floating and sinking objects of the dry heavy medium separator. For the separation of sorting products and media. The separated medium is lifted to the magnetic separator above the dry dense medium separator by the medium bucket elevator, and the coal powder in the medium is removed by the magnetic separator, and then the pure medium is unloaded to the dry dense medium separator Inside the machine, the medium can be recycled to reduce medium consumption.

In the fourth step, there is a dust suction pipe on the top of the dry dense medium separator, which is connected to the bag filter to reduce environmental pollution during the working process of the dry dense medium separator.

Fig. 3 is a schematic structural diagram of a dense medium sorting host in a dry dense medium sorting machine according to the present invention. Each reference sign in Fig. 3 specifically indicates: 501 float end unloader, 502 float scraper sprocket, 503 float scraper pinch wheel, 504 inspection window, 505 inspection door, 506 float chain scraper, 507 Medium powder screw conveyor, 508 sinking scraper sprocket, 509 sinking end unloader, 510 sinking scraper pressure wheel, 511 host leg, 512 sinking scraper, 513 high-pressure air chamber, 514 glass flowmeter , 515 host housing.

The unloader 501 at the floating object end and the unloader 509 at the sinking object end are located on both sides of the main separator, and their functions are to discharge products and lock the air; the whole main machine of the utility model is fully enclosed, and the use of the unloader can ensure The internal wind pressure is constant and there is no air leakage.

As shown in Figure 3, the floating scraper sprocket 502, the floating scraper pressing wheel 503, the floating chain scraper 506, the sinking scraper sprocket 508, the sinking end unloader 509, the sinking scraper press The wheel 510 and the sinking scraper 512 constitute the sorting system in the main separator, transport the sorted floating and sinking objects to the discharge ports on both sides of the main separator, and then discharge the products through the discharger .

The glass flowmeter 514 is located below the dry-process dense medium separator, which can detect the specific gravity of the gas-solid two-phase mixture in the dry-process dense medium separator, helping users complete the separation more intuitively and accurately.

The medium powder screw conveyor 507 is located below the outlet of the sinking scraper, and can transport the discharged medium at the sinking end to the main separator. The inspection window 504 and the inspection door 505 are windows for equipment inspection and maintenance, which are opened on the main body casing 515 . The high-pressure air chamber 513 can more evenly distribute the high-pressure air blown by the Roots blower into the main separator.

Figure 4-1 is a schematic diagram of a stainless steel grate screen in a dry-process dense medium separation mechanism, in which Figure 4-2 is a schematic diagram of a longitudinal section; Figure 4-3 is a schematic diagram of a transverse section. The stainless steel grate screen is made up of round tie rod 41 and grating bar 42.

The stainless steel grate screen is distributed in the high-pressure air chamber to prevent large particles from entering the air chamber under the screen. The stainless steel grate screen is selected because of its good wear resistance, corrosion resistance, good rigidity and stable performance.

Figure 5-1 is the front view of the scraper and pinch wheel cleaning mechanism, and Figure 5-2 is the left side view of the scraper pinch wheel. Wherein each reference sign specifically indicates: 51 adjusting bolts, 52 comb teeth, 53 pressure rollers. The comb tooth 52 is a steel plate with a pointed shape that can rotate according to a certain track. Under the support of the adjusting bolt 51, its pointed tooth will be in the direction of the outer circle diameter of the groove of the pressure roller 53 under normal operation. There is a gap of about 2 mm, which can scrape off the material on the pressure roller to prevent changing the running track of the scraper machine.

Figure 6-1 is the front view of the wear-resistant block, and Figure 6-2 is the cross-sectional view of the wear-resistant block. The wear-resistant block is a special part of the scraper machine in the main separator. It is the transitional link connecting the scraper and the chain. It works In the process, the wear-resistant block slides along the track in the main separator, so it must be treated with wear-resistant treatment (A surface in the figure) and the wear-resistant hardness is required to be above HRC55.

Fig. 7-1 is the right view of the scraper, and Fig. 7-2 is the front view of the scraper, in which each reference sign specifically indicates: 71 scraper bottom plate, 72 reinforced arc plate, 73 vertical rib. When the sorting bed surface of the main separator exceeds a specific value, in order to increase its rigidity and bending resistance, and the weight should not be overweight, it can be manufactured according to the structure shown in the figure, which saves materials and does not affect its rigidity.

Figure 8-1 is a detailed schematic diagram of the high-pressure air chamber. Figure 8-2 is a detailed schematic diagram of another high-pressure air chamber. Wherein each reference sign specifically indicates: 801 air chamber side plate, 802 stainless steel grating bar screen, 803 air distribution plate, 804 air chamber bottom plate, 805 air intake pipe. The air chamber side plate 801 and the air chamber bottom plate 804 form the air chamber, the air distribution plate 803 is above the bottom plate, the air intake pipe 805 is opened on the bottom plate, and the stainless steel grate screen 802 is above the air chamber. blind spot.

The dry-process dense medium separator of the utility model overcomes the problems of the existing single-chain scraper machine with single speed, low efficiency of coal conveying at the upper end, unclean waste rock scraping at the lower end, and dead angles left.

Adopting the dry method dense medium separator of the utility model can provide a kind of dry method dense medium fluidized bed dry method dense medium separator, and this dry method dense medium separator has the fluidity that can overcome the defective of prior art The state-based separation bed has a reasonable discharge scraper, a reasonable discharge adjustable speed, a reasonable length of the effective separation section, and a height of the separation bed, thereby improving the separation accuracy. It further has a reasonable de-intermediation device to improve the de-intermediation efficiency and increase the product recovery rate.

Further, by using the dry dense medium separator of the present invention, a dry dense medium fluidized bed sorting device can be provided, which can integrate sorting, dust removal, air supply and material feeding, and its The sorting tank solves the defects of the sorting tank in the prior art.

Investigate the essence of the utility model, the dry dense medium separator of the utility model firstly provides a kind of dense medium fluidized separation bed (i.e. dry dense medium separation bed) in the technology of overcoming the defects of the prior art , including the three flow streams in the separation bed (gas, aggravated matter and coal) all meet in the separation bed. The aggravated matter is in the fluidized separation chamber of the sorting bed, and the compressed gas enters the air chamber for initial pressure equalization and then enters the fluidized separation chamber to fluidize the aggravated matter to form a fluidized bed suitable for separation. The double-chain scraper conveying device rotates counterclockwise at different speeds. The coal to be selected enters from one end of the upper part, and the upper chain pushes the incoming material to move to the left. During the movement, the incoming material is layered, and the sink will not be pushed by the scraper. , it will gradually sink to the bottom of the fluidized separation chamber, and the lower chain will discharge the sinking from the tailing coal end; the floating matter above the fluidized bed will be discharged from the clean coal end by the upper chain. Fluidization is a continuous blowing process. After the gas rises from the solid particle interface, it should be in a positive pressure state, but the air volume of the dust removal is greater than the fluidization air volume, so that the upper space in the sorting host is in a negative pressure state, and the discharge No dust escapes at the coal end or elsewhere. Floating and sinking objects will bring out part of the aggravated matter when they are discharged. After being separated by the drum sieve, the products on the sieve can be transported to the designated position by the conveying equipment; Return to the sorting host through the chute.

The trommel de-intermediation device refers to that the clean coal and gangue separated from the sorting bed are discharged from the clean coal port and the gangue port respectively, and then enter their respective trommel de-intermediation devices for de-intermediation. The trommel screen uses the rotation of the central shaft to drive the screen The surface is rotated to make the material de-intermediate on the rotating screen surface. With this device, the de-intermediation efficiency is high.

In order to enable the materials to be effectively sorted in the fluidized bed, so that the light-density materials after separation can be fully floated, and the heavy-density materials can be completely sunk, and a double-chain chain plate discharge device is adopted. The upper chain plate can be used to transport light-density materials, so that the two materials can be fully and effectively separated.

One of the utility model points of the utility model is: based on the optimized design and innovation of the key components and the overall structure of the dry-process dense-medium separator, the developed dry-process dense-medium fluidized bed dry-process dense-media separator has greatly improved It increases the uniform stability of the fluidized bed, improves the separation effect, reduces the workload and time of equipment maintenance, and can ensure the long-term, continuous, stable and efficient operation of the dry-process heavy-medium separator.

Another utility model point of the utility model is: a new gas distributor and an easily disassembled air distribution device. The gas distributor is one of the key factors affecting bed fluidization and separation performance, and its main parameters include material, structure, pressure drop, opening ratio, pore size, etc. In order to discharge the sorted products out of the machine continuously, a scraper conveying device is installed in the fluidized bed. Different degrees of crushing occur, resulting in fine-grained sediments, and at the same time, the upper surface of the air distribution plate is subject to different degrees of wear. Therefore, the air distribution plate should have good anti-blocking, easy to clean, and wear-resistant properties. Based on the special process requirements and the Cp discriminant method of the pressure drop criterion, a large number of theoretical and experimental studies have been carried out, and two types of composite gas distributors have been developed. The first is the steel-based fiber composite distributor, which is mainly composed of steel-based material plates and fiber layers, and has the characteristics of smooth surface, wear resistance, resistance to block material embedding, and uniform air distribution. The role of the steel-based material plate is to support the bed material, resist impact and wear, and the role of the fiber layer is to control the pressure drop and evenly distribute the wind. The second is a two-stage composite large pressure drop gas distributor, which is mainly composed of a steel-based porous guard plate and a metal mesh pressing plate or woven fabric. It has the characteristics of easy cleaning, smooth surface, and wear resistance. The role of the steel-based porous guard is to support the bed material, resist impact and wear, and can be disassembled and cleaned when necessary. In order to effectively delay the plugging cycle, tapered holes can be used, and an appropriate height-to-diameter ratio can be selected. The function of the wire mesh pressing plate or woven cloth is to control the pressure drop and evenly distribute the air. At the same time, due to its certain strength, it can resist the embedding of block materials and assist in supporting the bed materials.

During the coal sorting process, the scraper conveyor in the dry heavy-medium sorting machine needs to continuously discharge the sorted products out of the machine. The air distribution plate is always in a state of extrusion and friction, which causes the crushing of the sink and the wear on the surface of the air distribution plate, and the fine particles produced by the crushing are easy to block the air inlet, which affects the performance and use of the air distribution plate life. Once the air distribution plate is damaged, it is difficult to replace it, and the workload is heavy, which takes 5-7 days to complete. In order to solve this problem, a drawer-type easy-to-disassemble air distribution device is proposed. The disassembly and assembly of the device only takes 3 to 5 hours, which is convenient for maintenance and adjustment. The sorting machine runs continuously and stably for a long time.

Heavy mass short-distance return device:

During the sorting process, part of the aggravated mass is discharged out of the dry heavy medium sorter along with the product. If the amount of heavy mass circulation is large, it will increase the difficulty of regulating the fluidized bed and affect the separation effect. In order to reduce the amount of weighted mass circulation, a weighted mass short-distance return device is added during the design process of the dry dense medium separator, as shown in Figure 5-6. With the application of the short-distance reflux device, the weighted mass circulation volume outside the machine is reduced by 80%, the operating power consumption and cost are greatly reduced, the fluidized bed is easy to control, and the separation effect is improved.

Another one of utility model point of the present utility model is: optimize process system design:

The modular dry dense medium fluidized bed coal preparation system integrates raw coal preparation, sorting, medium purification and recovery, air supply and dust removal on the same platform. It is a continuous operation coal high-efficiency dry coal preparation system. It works as follows:

(1) Fluidized sorting process

Under the action of the updraft after uniform air distribution, the fine-grained solid weight forms a gas-solid two-phase flow with fluid-like characteristics. The selected materials are subjected to the overall density of the fluidized bed in the gas-solid two-phase fluidized bed. According to the buoyancy effect of the bed layer density, the materials smaller than the bed layer density float up, and the materials larger than the bed layer density sink, and the light and heavy products after layering are discharged through the scraper conveying mechanism to complete the separation process. The dry heavy medium fluidized bed dry heavy medium separator uses the above principles to separate the selected materials to obtain clean coal and tailing coal products.

(2) Working process of sorting system

The process flow of the system is that the compressed air passes through the pre-air distribution chamber and the air distribution plate to form an evenly distributed updraft, and interacts with the weight in the dry dense medium separator to form a fluidized bed with a certain density. The selected raw coal is (dried) graded (100-6mm) and then evenly fed into the dry-process heavy-medium separator through the feeder, and the light and heavy products after stratification according to the density of the fluidized bed are discharged through the discharge mechanism. The light products and heavy products are separated through the media removal sieve to obtain clean coal and tailing coal. Part of the aggravated matter removed by the media removal screen enters the magnetic separator to remove the non-magnetic matter (coal powder), and the other part is recycled. The partial flow rate of the circulating medium, the feeding amount of the magnetic concentrate and the circulating medium are adjusted according to the height and density of the fluidized bed in the dry dense medium separator, so as to realize the control of the height and density of the fluidized bed. The dust generated during the working process of the sorting system is collected and circulated through induced wind dust removal.

(3) The dry method dense medium separator has the following breakthroughs

Breaking through the traditional wet coal preparation theory, the dry separation theory of dense-phase high-density gas-solid fluidization was established, and the principle of air distribution and wide particle size plus mass gradation was proposed. Developed a two-stage composite large pressure drop gas distributor, which has the properties of uniform air distribution, easy disassembly, anti-blocking and wear resistance; a short-distance return device is designed to reduce the amount of aggravated mass circulation by 80%; a wide particle size aggravated quality, the dominant particle size range has been expanded by 2.5 times, and the operating cost has been greatly reduced.

Integrate and modularize a new generation of dry dense medium fluidized bed dry dense medium separator and related auxiliary equipment, and develop a modular dry dense medium fluidized bed coal preparation system and equipment with a processing capacity of 40-60t /h, the sorting accuracy (possible deviation E value) is 0.05-0.08g/cm ³ , the feed particle size is 100-6mm, the sorting density can be adjusted within the range of 1.3-2.2g/cm ³ , the sorting quantity efficiency >90%, media consumption per ton of coal <0.5kg. The air intake volume of the modular dry dense medium fluidized bed coal preparation system is greater than the air supply volume, the system is in a negative pressure state, the dust removal system is reasonably matched, and the dust is small; the system runs smoothly with low noise and meets environmental protection requirements.

As above, the technical solution proposed by the present utility model has been described clearly and in detail. Although the preferred embodiments of the present invention have described and explained the present invention in detail, those of ordinary skill in the art will understand that, without departing from the spirit and scope of the present invention defined by the appended claims, it can be made in the form Various modifications were made in the details.

Claims (7)

1. A dry heavy medium separation bed, which is specially used for a dry heavy medium separator, is characterized in that the dry heavy medium separator includes a floating object end medium drum screen, a dust collector pipeline, and a sinking object end medium Trommel screen and magnetic separator; among them, the medium trommel screen at the floating end and the medium trommel at the sinking end are set under the floating discharge end and the sinking discharge end of the dry dense medium separator; Dust collector pipes are installed on the top of the machine; dust suction pipes are installed at the floating side media trommel screen, the sinking side media trommel screen and the magnetic separator, and the whole system is in a fully closed working state; The dry dense medium separation bed is equipped with a gas distributor, the gas distributor is a steel-based fiber composite distributor or a two-stage composite large pressure drop gas distributor, and the two-stage composite large pressure drop gas distributor is composed of a steel-based porous guard plate Overlaid with wire mesh pressboard or woven fabric. 2. according to the described dry method dense medium separation bed of claim 1, it is characterized in that, the dry method dense medium separator further comprises the air bag, the Roots blower that have formed the air supply system of dry method dense medium separator and high pressure hoses. 3. The dry heavy medium separation bed according to claim 1, characterized in that the dry heavy medium separation bed is provided with a double-chain scraper conveying device, which rotates counterclockwise at different speeds. 4. According to the dry heavy medium separation bed according to claim 3, it is characterized in that the upper chain scraper conveyor in the double-chain scraper conveyor is used to push the feed to move to the left; the double-chain scraper conveyor The lower chain scraper conveying device is used to discharge the sunken material from the tailing coal end. 5. The dry dense medium separation bed according to claim 3, characterized in that the upper space in the separation host is in a negative pressure state. 6. According to the dry heavy medium separation bed according to claim 3, it is characterized in that conveying equipment is set, and the product on the screen can be transported to a designated position by the conveying equipment after the trommel screen is released; the medium belt under the screen is set, and the screen The lower weight falls on the medium belt under the screen, and then the upper bucket elevator returns to the sorting host through the chute. 7. The dry dense medium separation bed according to claim 1-3 or 6, characterized in that a double chain chain plate discharge device is used.