CN106731930B - System and method for uniformly blending filter-pressed coal slime cakes and gravity coarse-grain coal - Google Patents
System and method for uniformly blending filter-pressed coal slime cakes and gravity coarse-grain coal Download PDFInfo
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- CN106731930B CN106731930B CN201611148270.2A CN201611148270A CN106731930B CN 106731930 B CN106731930 B CN 106731930B CN 201611148270 A CN201611148270 A CN 201611148270A CN 106731930 B CN106731930 B CN 106731930B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/60—Mixing solids with solids
- B01F23/69—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/30—Feeding devices ; Discharge devices
- B01D25/305—Feeding devices ; Discharge devices for discharging filtrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
- B01F25/90—Falling particle mixers, e.g. with repeated agitation along a vertical axis with moving or vibrating means, e.g. stirrers, for enhancing the mixing
- B01F25/901—Falling particle mixers, e.g. with repeated agitation along a vertical axis with moving or vibrating means, e.g. stirrers, for enhancing the mixing using one central conveyor or several separate conveyors, e.g. belt, screw conveyors or vibrating tables, for discharging flows from receptacles, e.g. in layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83612—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by crushing or breaking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
- B02C18/142—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with two or more inter-engaging rotatable cutter assemblies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/18—Knives; Mountings thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/22—Feed or discharge means
- B02C18/2225—Feed means
- B02C18/2266—Feed means of revolving drum type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/286—Feeding devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to the technical field of uniform mixing of flotation clean coal and gravity clean coal, in particular to a system and a method for uniformly mixing filter-pressed coal slime cakes and gravity coarse-grained coal. The invention comprises a working system, wherein a filter cake of a multi-section pull-open type filter press is impacted by dead weight to roll an elastic connecting rod primary crushing device to finish primary crushing; the materials after primary crushing enter a double-layer scraper, the upper layer of the double-layer scraper is used for storing the materials, and the lower layer of the double-layer scraper is used for continuously transporting the materials through a scraper; the materials enter a low-speed disc feeder, and the blanking amount is controlled by adjusting the rotating speed and the opening degree of a blanking opening; the materials are crushed by a cutter tooth type double-roller crusher and then fall onto a total clean coal belt, and a three-layer squirrel-cage mixer is arranged obliquely below the discharge end of the total clean coal belt to realize uniform mixing of the materials; a material guide plate is arranged at the discharge end of the upper bin belt to play a role of dispersing blanking points; the invention has reasonable process layout, equipment selection and structural design, even material mixing and reliable and stable effect.
Description
Technical Field
The invention relates to the technical field of uniform mixing of flotation clean coal and gravity clean coal, in particular to a system and a method for uniformly mixing filter-pressed coal slime cakes and gravity coarse-grained coal.
Background
Flotation is the most important interfacial separation method, is generally used for separating coal slime of-0.5 mm, and is the only effective separation method for coal slime of-0.1 mm. The flotation effect is affected by various factors, such as the material composition and chemical composition of minerals, pulp preparation, a flotation reagent system, the working condition of a flotation machine and the like, so that the ash content of the flotation clean coal can fluctuate in a certain interval, and in order to ensure the quality (ash content and moisture content) of clean coal of the whole coal preparation plant, the method of back ash of the gravity clean coal is adopted by most coal preparation plants, namely the ash content of the gravity clean coal is reduced, so that the phenomenon of high ash content of the flotation clean coal is compensated, and the ash content of a mixed product of the flotation clean coal and the gravity clean coal meets the requirements of users. Because the flotation concentrate foam is mostly dehydrated and recovered by adopting a filter press, the filter cake of the filter-pressed coal slime has high viscosity and high moisture, is usually agglomerated into cakes and is discontinuously discharged, and crushing equipment is generally required to crush and loosen the filter cake so as to be uniformly mixed into the gravity coarse-grained clean coal; the coal slime crusher is commonly used in coal preparation plants at present, as disclosed in Chinese patent document CN104475211A, a tooth knife type coal product crushing and mixing machine and a clean coal and coal slime cake crushing and mixing method are utilized, the crushing part of the crusher is utilized to crush and loosen the agglomerated coal slime, but the problems are that (1) the crushing and loosening of the filter pressing coal slime cake is incomplete, the phenomenon of re-agglomeration of the filter pressing coal slime cake is caused in the subsequent transportation process, and (2) the method is imperfect, only the crushing and loosening method of the filter pressing coal slime cake is provided, and the problem of uniformly mixing the crushed and loosened material with the re-selected coarse grain coal is ignored.
Accordingly, there is a need in the art to provide a more efficient and improved system and method for crushing and loosening filter cake of press-filter coal slurry and uniformly blending the crushed and loosened material with the gravity-fed coarse-grained coal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a more effective and perfect system and a method for uniformly mixing filter-pressed coal slime cakes and gravity coarse-grained coal. The invention includes two systems: and the filter cake crushing system and the material uniform mixing system of the filter press. The filter cake crushing system of the filter press comprises a multi-section pull-open filter press, a rolling elastic connecting rod primary crushing device, a double-layer scraper, a low-speed disc feeder and a cutter tooth type double-roller crusher; the rolling elastic connecting rod primary crushing device is arranged in a discharging chute of the filter press, and the rolling elastic connecting rod is impacted by the dead weight of a coal slime filter cake in the discharging process to crush the filter cake; the material crushed by the rolling elastic connecting rod primary crushing device enters a double-layer scraper, the upper layer of the double-layer scraper is used for storing the material crushed primarily, the lower layer of the double-layer scraper is used for continuously transporting the material by a scraper, the filter press is well and intermittently and intensively discharged and converted into continuous and dispersed discharging, and in addition, a plurality of discharging holes are formed between the upper layer and the lower layer of the double-layer scraper and are used for dispersing the material and falling onto the scraper of the lower-layer scraper, so that the material crushed primarily is prevented from being bonded again into blocks due to high moisture and high viscosity; the discharging material of the double-layer scraper enters a low-speed disc feeder, the working rotating speed of the low-speed disc feeder is lower than 2r/min, a hydraulic flashboard is arranged at a discharging opening of the low-speed disc feeder and is used for adjusting the opening degree of the discharging opening of the disc feeder, and the discharging amount is effectively controlled; the low-speed disc feeder continuously and evenly distributes and discharges materials, conditions are provided for deep refinement and crushing of coal slime by the cutter tooth type double-roller crusher, the cutter tooth type double-roller crusher comprises rollers moving in opposite directions, cutter teeth for cutting are arranged on the rollers, and the cutter teeth can effectively crush massive coal slime into fine-particle-grade coal slime and provide conditions for uniform mixing of materials in the next step. The material uniform mixing system comprises a total clean coal belt, a three-layer squirrel-cage mixer, an upper bin belt and a material guide plate; the discharged materials of the cutter tooth type double-roller crusher uniformly fall onto a continuous running total clean coal belt, and a thin layer of coal slime is formed on the upper layer of the gravity separation coarse-grained coal; in order to fully mix the crushed coal slime and the gravity coarse-grain coal to form a homogenized product, a three-layer squirrel-cage mixer is arranged on the inclined lower part of the discharge end of a total clean coal belt along the track of material movement, the three-layer squirrel-cage mixer comprises an outer-layer stirrer, a middle-layer stirrer, an inner radial rib and a central sleeve, the outer-layer stirrer and the middle-layer stirrer are respectively composed of a transverse stirring rib and a circumferential stirring rib, the outer-layer stirrer and the middle-layer stirrer are fixedly connected in series by the inner radial rib, the other end of the inner radial rib is fixedly connected on the central sleeve, the central sleeve is cylindrical, on one hand, the material is prevented from directly penetrating through the three-layer squirrel-cage mixer in the discharging process to form a series, on the other hand, the rotating shaft arranged in the interior is protected, the rotating speed of the rotating shaft can be regulated by a speed reducer, and the speed reducer is driven by a motor, and the crushed coal slime and the gravity coarse-grain coal are uniformly mixed under the combined action of the outer-layer stirrer, the middle-layer stirrer and the central sleeve; the evenly mixed materials are transferred and transported to a product bin through an upper bin belt, a left material guide plate, a middle material guide plate and a right material guide plate are respectively arranged at the discharge end of the upper bin belt along the movement direction of the belt, under the action of the material guide plates, the materials are scattered and fall into different positions of the product bin, and the coal slime bonding problem caused by concentrated blanking is solved by the way of scattering blanking points, so that the blending uniformity is further improved. The invention has reasonable layout, equipment selection and structural design of the process system, even material mixing and reliable and stable effect.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a system and a method for uniformly blending filter-pressed slime cakes and gravity coarse-grain coal comprise a multi-section pull-open type filter press, and are characterized by further comprising the following components: a rolling elastic connecting rod primary crushing device is arranged in a discharging chute of the filter press, and the rolling elastic connecting rod is impacted by the dead weight of the coal slime filter cake in the discharging process to perform primary crushing; the materials after preliminary crushing fall into a double-layer scraper arranged below, wherein the upper layer of the double-layer scraper is used for locally storing materials, and the lower layer of the double-layer scraper is used for transporting; the material conveyed by the double-layer scraper enters a low-speed disc feeder, the working rotating speed of the low-speed disc feeder is lower than 2r/min, and a hydraulic flashboard is arranged at a feed opening of the low-speed disc feeder and used for controlling the feed amount; feeding materials of the low-speed disc feeder into a cutter tooth type double-roller crusher, wherein the cutter tooth type double-roller crusher comprises rollers which move in opposite directions, and cutter teeth for cutting are arranged on the rollers; the utility model provides a cutter tooth formula twin roll breaker's ejection of compact evenly drops to total clean coal belt, the oblique below of discharge end of total clean coal belt has arranged three-layer squirrel cage blender on the orbit of material motion for mix filter-pressing coal slime and gravity coarse grain coal, the material after mixing drops to last storehouse belt, at the discharge end of storehouse belt, along the direction of motion of belt, left side, well, right side have arranged left stock guide, well stock guide and right stock guide respectively, under the effect of stock guide, the material disperses and falls into the different positions in product storehouse.
The rolling elastic connecting rod primary crushing device comprises a rolling elastic connecting rod and a frame for fixing the rolling elastic connecting rod; the rolling elastic connecting rod is made of steel with certain elasticity and toughness, and two ends of the rolling elastic connecting rod are fixedly connected to the frame and cannot transversely move along the frame, but can do circular motion around the fixed joint; the coal leveling device is characterized in that guide rails are arranged above the brackets on the two lateral sides of the frame, and a coal leveling device driven by a chain can do reciprocating lateral movement on the guide rails.
A plurality of discharge holes are formed between the upper layer of the double-layer scraper and the lower layer of the double-layer scraper and are used for dispersing materials and falling onto the scraping plate of the scraper.
The three-layer squirrel-cage mixer comprises an outer layer mixer, a middle layer mixer, inner radial ribs and a central sleeve; the outer layer stirrer consists of transverse stirring ribs and circumferential stirring ribs at the outermost layer; the middle layer stirrer consists of a middle layer transverse stirring rib and a circumference stirring rib; the outer layer stirrer and the middle layer stirrer are fixedly connected in series by the inner radial ribs, the other ends of the inner radial ribs are fixedly connected on the central sleeve, a rotating shaft is arranged in the central sleeve, the rotating shaft is connected with the kinetic energy output end of the speed reducer, and the speed reducer is driven by a motor.
The invention has the beneficial effects that:
the invention is reasonable and effective in the design of the process system, and the whole process system comprises a filter cake crushing system of a filter press and a material uniform mixing system.
1. A filter cake crushing system of the filter press: the filter cake of the multi-section pull-open type filter press is impacted by self gravity to roll the elastic connecting rod in the unloading process, the whole filter cake is broken into small blocks under the action of the impact force, the broken coal slime blocks are also subjected to upward resilience force and form secondary collision with falling coal slime to further promote the materials to be broken and loose, in order to prevent the materials from piling up in a chute, the rolling elastic connecting rod is designed into a form that the rolling elastic connecting rod can roll around a fixed joint by itself, the probability of piling up the materials in the chute is reduced, meanwhile, a coal leveling device which is driven by a chain and can do transverse movement above the rolling elastic connecting rod is arranged in the chute, and the phenomenon that the materials are piled up in the chute is thoroughly eradicated by periodically reciprocating transverse movement of the coal leveling device; the double-layer scraper machine has the advantages that the upper layer is used for storing the materials after primary crushing, the lower layer is used for scraping plates for continuously transporting the materials, intermittent concentrated discharging of the filter press is well converted into continuous dispersed discharging, conditions are provided for the space and time of the low-speed disc feeder, on one hand, the materials are prevented from being accumulated in the low-speed disc feeder, on the other hand, the material conveying time is prolonged, and preconditions are provided for the low-speed disc feeder to work at a rotating speed lower than 2 r/min; the low-speed disc feeder strictly controls the discharge amount under the conditions of low rotation speed and low opening degree of a feed opening, and creates good conditions for deep fine fraction crushing of the massive coal slime; the cutter teeth type double-roller crusher is selected for crushing the coal slime, and cutter teeth for cutting are arranged on the roller, so that the massive coal slime can be effectively crushed into fine-particle-grade coal slime, and conditions are provided for uniform blending of materials in the next step.
2. The materials are mixed in a uniform mixing system to realize 'two steps', firstly 'blending', fine-particle-grade coal slime falls down uniformly on a continuous running total clean coal belt, and a thin layer of coal slime is formed on the upper layer of the gravity coarse-particle coal; secondly, mixing to fully mix the crushed coal slime and the coarse grain coal to form a homogenized product; a three-layer squirrel-cage mixer is arranged on the track of the movement of the materials at the obliquely lower part of the discharge end of the total clean coal belt, the three-layer squirrel-cage mixer comprises an outer layer stirrer, a middle layer stirrer, an inner radial rib and a central sleeve, the outer layer stirrer and the middle layer stirrer are respectively composed of transverse stirring ribs and circumferential stirring ribs, the outer layer stirrer and the middle layer stirrer are fixedly connected in series by the inner radial rib, the other end of the inner radial rib is fixedly connected on the central sleeve, the central sleeve is cylindrical, on one hand, the materials are prevented from directly penetrating through the three-layer squirrel-cage mixer to form a series of materials in the discharging process, on the other hand, the rotating speed of the rotating shaft is regulated by a speed reducer, the speed reducer is driven by a motor, the outer layer stirrer, the middle layer stirrer and the central sleeve form a three-layer stirring effect, and the uniform mixing of broken coal slime and heavy-selection coarse particles is realized; the evenly mixed materials are transferred and transported to a product bin through an upper bin belt, a left material guide plate, a middle material guide plate and a right material guide plate are respectively arranged at the discharge end of the upper bin belt along the movement direction of the belt, under the action of the material guide plates, the materials are scattered and fall into different positions of the product bin, and the coal slime bonding problem caused by concentrated blanking is solved by the way of scattering blanking points, so that the blending uniformity is further improved.
Drawings
Fig. 1 is a device layout diagram of the present invention.
FIG. 2 is a flow chart of the process system of the present invention.
Fig. 3 is a front view of a three-layer squirrel cage mixer structure.
Fig. 4 is a top view of a three-layer squirrel cage mixer structure.
The meaning of the reference symbols in the figures is as follows:
a-multistage pull-open filter press A1-blanking chute B-rolling elastic connecting rod primary crushing device
B1-rolling elastic connecting rod B2-frame B3-guide rail B4-coal leveling device
C-double-layer scraper C1-double-layer scraper upper layer C2-double-layer scraper lower layer
D1-hydraulic flashboard of C3-discharge port D-low-speed disc feeder
E-cutter tooth type double-roller crusher E1-roller E2-cutter tooth F-total clean coal belt
G-three-layer squirrel-cage mixer G1-outer stirrer G11-transverse stirring rib
G12-circumferential stirring rib G2-middle layer stirrer G21-transverse stirring rib
G3-inner radial rib G4-center sleeve G41-rotating shaft G42-speed reducer
G43-motor H-upper bin belt H1-middle guide plate H2-left guide plate H3-right guide plate
I-product bin
Detailed Description
For ease of understanding, specific embodiments of the present invention are described further herein below in conjunction with FIGS. 1-4:
the specific components of the invention are divided into two systems: and the filter cake crushing system and the material uniform mixing system of the filter press. The filter cake crushing system of the filter press comprises a multi-section pull-open filter press A, a rolling elastic connecting rod primary crushing device B, a double-layer scraper C, a low-speed disc feeder D and a cutter tooth type double-roller crusher E; the material uniform mixing system comprises a total clean coal belt F, a three-layer squirrel-cage mixer G, an upper bin belt H and a material guide plate; the following describes one by one:
1. filter cake crushing system of filter press
(1) Multi-section pull-open type filter press
The flotation foam enters a multistage pull-open type filter press A to be dehydrated, a filter pressing cake is formed, and a multistage pull-open mode is adopted to rapidly discharge.
(2) Initial crushing device for rolling elastic connecting rod
The rolling elastic connecting rod primary crushing device B is arranged in a discharging chute A1 of the filter press, the rolling elastic connecting rod B1 is impacted by the dead weight of a coal slime filter cake in the discharging process to crush the filter cake, the rolling elastic connecting rod B1 has certain elasticity and toughness, materials are impacted to the rolling elastic connecting rod B1 and then are subjected to the secondary action of resilience force and the collision action of opposite movement among the materials, the materials are further promoted to be crushed and loosened, the rolling elastic connecting rod B1 can do circular rolling movement around a fixed joint, the probability of stacking the materials in the chute is reduced, meanwhile, a coal flattening device B4 which is driven by a chain and can do transverse movement on a guide rail B3 above a frame B2 is arranged in the chute, and the coal flattening device B4 periodically reciprocates transversely, so that the phenomenon that the materials are stacked in the chute is completely eradicated.
(3) Double-layer scraper
The material after the crushing of roll elastic connecting rod primary crushing device B gets into bilayer and scrapes trigger C, and bilayer scrapes the upper strata C1 of trigger and is used for storing the material after the primary crushing, and bilayer scrapes the upper strata C2 of trigger and is used for the scraper blade to transport the material in succession, and bilayer scrapes trigger C's adoption, fine concentrated the row of pressure filter, changes the scattered ejection of compact of continuity, in addition, has seted up a plurality of discharge gates C3 between upper strata and the lower floor of trigger is scraped to bilayer for the material dispersion falls into on the scraper blade of trigger is scraped to the lower floor, avoids the material after the primary crushing to bond into the piece again because of moisture is high, viscosity is big.
(4) Low-speed disc feeder
The discharging material of the double-layer scraper enters a low-speed disc feeder D, the working rotating speed of the low-speed disc feeder is lower than 2r/min, a hydraulic flashboard D1 is arranged at a discharging opening of the low-speed disc feeder and used for adjusting the opening degree of the discharging opening of the disc feeder, the discharging amount is effectively controlled, and good conditions are created for deep and fine fraction crushing of the blocky coal slime.
(5) Knife tooth type double-roller crusher
The cutter tooth type double-roller crusher E comprises a roller E1 which moves in opposite directions, and cutter teeth E2 used for cutting are arranged on the roller, so that the massive coal slime can be effectively crushed into fine-particle-grade coal slime, and conditions are provided for uniform mixing of materials in the next step.
2. Material uniform mixing system
(1) Belt for general clean coal
The discharged materials of the cutter tooth type double-roller crusher E uniformly drop onto a continuous running total clean coal belt F, a thin layer of coal slime is formed on the upper layer of the gravity coarse-grain coal, and preliminary blending of the crushed coal slime and the gravity coarse-grain coal is completed.
(2) Three-layer squirrel-cage mixer
In order to fully mix the crushed coal slime and the gravity coarse-grain coal to form a homogenized product, a three-layer squirrel-cage mixer G is arranged on the track of the movement of the materials along the oblique lower part of the discharge end of the total clean coal belt F, the three-layer squirrel-cage mixer G comprises an outer-layer stirrer G1, a middle-layer stirrer G2, an inner radial rib G3 and a central sleeve G4, the outer-layer stirrer G1 consists of an outermost transverse stirring rib G11 and a circumferential stirring rib G12, the middle-layer stirrer G2 consists of a middle-layer transverse stirring rib G21 and a circumferential stirring rib (G12), the outer-layer stirrer G1 and the middle-layer stirrer G2 are fixedly connected in series by the inner radial rib G3, the other end of the inner radial rib G3 is fixedly connected on the central sleeve G4, the central sleeve G4 is cylindrical, on the one hand, the materials are prevented from directly penetrating through the three-layer squirrel-cage mixer G in the discharging process to form a series material, on the other hand, the rotating shaft G41 arranged inside is protected, the rotating speed of the rotating shaft G41 can be adjusted by a speed reducer G42, and the speed reducer G42 is driven by a motor G43 to uniformly mix the coarse-grain coal slime under the actions of the outer-layer stirrer G1, the coarse-layer stirrer G2 and the gravity coarse-grain coal slime and the gravity coarse-grain coal.
(3) Feeding belt H and guide plate
The evenly mixed materials are transferred and transported to a product bin I through an upper bin belt H, a left material guide plate H2, a middle material guide plate H1 and a right material guide plate H3 are respectively arranged at the discharge end of the upper bin belt H along the movement direction of the belt, under the action of the material guide plates, the materials are scattered and fall into different positions of the product bin I, and the coal slime bonding problem caused by concentrated blanking is solved by a material scattering and blanking point mode, so that the mixing uniformity is further improved.
Claims (1)
1. A system for uniformly blending filter-pressed slime cakes and gravity coarse-grain coal comprises a multi-section pull-open filter press (A), and is characterized by further comprising the following components: a rolling elastic connecting rod primary crushing device (B) is arranged in a discharging chute (A1) of the filter press, and the rolling elastic connecting rod (B1) is impacted by the dead weight of a coal slime filter cake in the discharging process to perform primary crushing; the materials after preliminary crushing fall into a double-layer scraper (C) arranged below, the upper layer (C1) of the double-layer scraper is used for partial storage, and the lower layer (C2) of the double-layer scraper is used for transportation; the material conveyed by the double-layer scraper machine (C) enters a low-speed disc feeder (D), the working rotating speed of the low-speed disc feeder (D) is lower than 2r/min, and a hydraulic flashboard (D1) is arranged at a feed opening of the low-speed disc feeder (D) and used for controlling the feed amount; feeding the low-speed disc feeder (D) into a cutter tooth type double-roller crusher (E), wherein the cutter tooth type double-roller crusher (E) comprises a roller (E1) which moves in opposite directions, and cutter teeth (E2) for cutting are arranged on the roller (E1); the method comprises the steps that the discharged materials of a cutter tooth type double-roller crusher (E) uniformly fall onto a total clean coal belt (F), the discharging end of the total clean coal belt (F) is obliquely arranged below the discharging end of the total clean coal belt, a three-layer squirrel-cage mixer (G) is arranged on a track along which materials move and is used for mixing filter-pressed coal slime and gravity coarse-grain coal, the mixed materials fall onto an upper bin belt (H), a left guide plate (H2), a middle guide plate (H1) and a right guide plate (H3) are respectively arranged at the discharging end of the upper bin belt (H) along the moving direction of the belt, and the materials fall into different positions of a product bin (I) in a dispersed manner under the action of the guide plates;
the rolling elastic connecting rod primary crushing device (B) comprises a rolling elastic connecting rod (B1) and a frame (B2) for fixing the rolling elastic connecting rod (B1); the rolling elastic connecting rod (B1) is made of steel with certain elasticity and toughness, and two ends of the rolling elastic connecting rod (B1) are fixedly connected to the frame (B2) and cannot transversely move along the frame (B2), but can do circular motion around the fixed joint; a guide rail (B3) is arranged above the brackets on the two lateral sides of the frame (B2), and a coal leveling device (B4) driven by a chain can do reciprocating lateral movement on the guide rail;
a plurality of discharge holes (C3) are formed between the upper layer (C1) of the double-layer scraper and the lower layer (C2) of the double-layer scraper and are used for dispersing materials and falling onto the scraping plate of the scraper.
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| CN201611148270.2A CN106731930B (en) | 2016-12-13 | 2016-12-13 | System and method for uniformly blending filter-pressed coal slime cakes and gravity coarse-grain coal |
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| CN201611148270.2A CN106731930B (en) | 2016-12-13 | 2016-12-13 | System and method for uniformly blending filter-pressed coal slime cakes and gravity coarse-grain coal |
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| CN106731930B true CN106731930B (en) | 2023-10-03 |
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| CN110961014A (en) * | 2018-09-30 | 2020-04-07 | 南京梅山冶金发展有限公司 | Device and method for scattering and uniformly mixing two materials |
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| CN111390773A (en) * | 2020-03-30 | 2020-07-10 | 西安理工大学 | Sand blasting device and sand blasting method thereof |
| CN113368994A (en) * | 2021-06-01 | 2021-09-10 | 安徽理工大学 | Device for crushing filter cake and proportioning mixed materials |
| CN113754224A (en) * | 2021-08-31 | 2021-12-07 | 中煤天津设计工程有限责任公司 | Continuous feeding device for filter-pressing coal slime |
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