CN206240340U - A system for uniform mixing of press filter coal slime cake and gravity separation coarse coal - Google Patents

Abstract

The utility model relates to the technical field of uniform mixing of flotation clean coal and gravity separation clean coal, in particular to a system for uniform mixing of pressure filter coal slime cake and gravity separation coarse coal. The utility model includes the following working system. The filter cake of the multi-stage pull-off filter press relies on its own weight to impact the rolling elastic connecting rod primary crushing device to complete the primary crushing; the primary crushed material enters the double-layer scraper machine, and the double-layer scraper machine The upper layer is used to store materials, and the lower layer is used for continuous transportation of materials by scrapers; materials enter the low-speed disc feeder, and the amount of feeding is controlled by adjusting the speed and opening of the feeding port; the materials are crushed by a knife-toothed double-roller crusher. After that, it falls onto the clean coal belt, and a three-layer squirrel cage mixer is arranged obliquely below the discharge end of the clean coal belt to achieve uniform mixing of materials; a material guide plate is arranged at the discharge end of the upper bin belt, It plays the role of dispersing the blanking point; the utility model is reasonable in process layout and equipment structure design, the materials are evenly mixed, and the effect is reliable and stable.

Description

A system for uniform mixing of press filter coal slime cake and gravity separation coarse coal

technical field

The utility model relates to the technical field of uniform mixing of flotation clean coal and gravity separation clean coal, in particular to a system for uniform mixing of pressure filter coal slime cake and gravity separation coarse coal.

Background technique

The flotation method is the most important interface separation method, which is generally used for the separation of -0.5mm coal slime, and is the only effective separation method for -0.1mm coal slime. The flotation effect is affected by many factors, such as the material composition and chemical composition of minerals, pulp preparation, flotation agent system, and the working conditions of flotation machines. Therefore, the ash content of flotation clean coal will fluctuate in a certain range. In order to ensure The quality (ash and moisture) of clean coal in the entire coal preparation plant meets the needs of users. Most coal preparation plants adopt the method of "back ash" for heavy separation clean coal, that is, to reduce the ash content of heavy separation clean coal to make up for flotation clean coal. The high coal ash content makes the ash content of the mixed product of flotation clean coal and gravity separation clean coal meet the user's requirements. Because most of the flotation concentrate foam is dehydrated and recovered by filter press, the filter cake of filter press slime has high viscosity and high water content, and usually agglomerates into cakes and is unloaded intermittently. Generally, crushing equipment is required to break and loosen it. In order to be evenly mixed into the coarse-grained clean coal of gravity separation; coal slime crushers are commonly used in coal preparation plants, such as the "tooth knife type coal product crusher and clean coal and slime cake crushing and mixing machine" disclosed in Chinese patent document CN104475211A method", using the crushing parts of the crusher to break and loosen the agglomerated coal slime, but there are the following problems: ① The filter press coal slime cake is not completely broken and loose, and there is a phenomenon of rebonding into lumps during the subsequent transportation process. ② The method is not perfect. It only provides the method of crushing and loosening the filter press coal slime cake, but ignores the problem of how to mix the crushed and loosened material evenly with gravity-selected coarse-grained coal.

Therefore, those skilled in the art urgently need to provide a more effective and complete system and method for crushing and loosening the press filter coal slime filter cake, and uniformly blending the crushed and loose material with gravity-selected coarse coal.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art, and provide a more effective and perfect system for evenly mixing the filter press slime cake and gravity-selected coarse-grained coal. The utility model includes two systems: a filter cake crushing system of a filter press and a material uniform mixing system. The filter cake crushing system of the filter press includes a multi-stage pull-off filter press, a rolling elastic connecting rod primary crushing device, a double-layer scraper machine, a low-speed disc feeder, and a knife-toothed double-roller crusher; a rolling elastic connecting rod primary crushing device The crushing device is arranged in the discharge chute of the filter press, and the crushing of the filter cake is completed by the impact of the weight of the slime filter cake on the rolling elastic connecting rod during the unloading process. Because the rolling elastic connecting rod has certain elasticity and toughness, the material impacts to the rolling After the elastic connecting rod, it is also subjected to the secondary action of the rebound force and the collision between the materials, which further promotes the breaking and loosening of the material. The rolling elastic connecting rod itself can perform circular rolling motion around the fixed point, reducing the probability of material accumulation in the chute. At the same time, a coal leveler that uses a chain drive and can move laterally above the rolling elastic connecting rod is set in the chute. The leveling device periodically reciprocates and laterally moves to completely prevent the accumulation of materials in the chute; the rolling elastic connecting rod initially The material crushed by the crushing device enters the double-layer scraper machine. The upper layer of the double-layer scraper machine is used to store the primary crushed material, and the lower layer is used for continuous transportation of materials by the scraper. The adoption of the double-layer scraper machine is very good. The intermittent centralized discharge of the filter press is converted into continuous dispersed discharge. In addition, there are multiple discharge ports between the upper and lower layers of the double-layer scraper machine for materials to disperse and fall into the lower layer of the scraper machine. on the scraper to prevent the primary crushed material from re-bonding into blocks due to high moisture and high viscosity; the output of the double-layer scraper machine enters the low-speed disc feeder, and the working speed of the low-speed disc feeder is lower than 2r/min, a hydraulic ram is set at the discharge port of the low-speed disc feeder, which is used to adjust the opening degree of the discharge port of the disc feeder, and effectively control the discharge amount; the continuity of the low-speed disc feeder Evenly disperse the material, which provides conditions for the deep refinement of the knife-toothed double-roller crusher to crush the coal slime. The knife-toothed double-roller includes rollers moving in opposite directions, and the cutter teeth for cutting are installed on the rollers, which can Effectively crush lumpy coal slime into fine-grained coal slime, providing conditions for the uniform mixing of materials in the next step. The material uniform mixing system includes the total clean coal belt, the three-layer squirrel cage mixer, the upper bin belt and the material guide plate; A thin layer of coal slime is formed on the upper layer of gravity-selected coarse-grained coal; in order to fully mix the broken coal slime and gravity-selected coarse-grained coal to form a homogenized product, it is obliquely below the discharge end of the total clean coal belt, A three-layer squirrel-cage mixer is arranged along the trajectory of material movement. The three-layer squirrel-cage mixer includes an outer layer agitator, a middle layer agitator, an inner radial rib and a central sleeve. The outer and middle layer agitators are both It consists of respective horizontal stirring ribs and circumferential stirring ribs. The outer stirrer and the middle stirrer are connected in series by the inner radial ribs, and the other end of the inner radial ribs is fixed on the central casing. The central sleeve is cylindrical, on the one hand, it prevents the material from passing through the three-layer squirrel cage mixer directly during the feeding process to form "stringing", on the other hand, it protects the internal rotating shaft, whose speed can be adjusted by the reducer , the reducer is driven by the motor, and under the joint action of the outer layer agitator, the middle layer agitator and the center casing, the broken coal slime and gravity-selected coarse coal are evenly mixed; the evenly mixed materials are transferred to the product bin by the upper bin belt, At the discharge end of the belt in the upper warehouse, along the moving direction of the belt, there are left, middle and right guide plates respectively arranged on the left, middle and right guide plates. Under the action of the guide plates, the materials fall into the The different positions of the product bins and the method of dispersing the blanking points eliminate the problem of coal slime sticking caused by centralized blanking, and further improve the uniformity of blending. The utility model is reasonable in process system layout, equipment selection and structural design, materials are evenly mixed, and the effect is reliable and stable.

In order to achieve the above object, the utility model adopts the following technical solutions:

A system for uniformly blending filter press slime cake and gravity-selected coarse coal, comprising a multi-stage pull-off filter press, characterized in that it also includes the following components: a rolling elastic coupling is arranged in the discharge chute of the filter press The rod primary crushing device relies on the self-weight impact of the slime filter cake during the unloading process on the rolling elastic connecting rod for primary crushing; the primary crushed material falls into the double-layer scraper machine arranged below, and the upper layer of the double-layer scraper machine is used for Partial storage, the lower layer of the double-layer scraper machine is used for transportation; the material conveyed by the double-layer scraper machine enters the low-speed disc feeder, and the working speed of the low-speed disc feeder is lower than 2r/min. The feeding port of the feeder is equipped with a hydraulic gate to control the amount of feeding; the feeding of the low-speed disc feeder enters the knife-toothed double-roll crusher, which includes opposite-moving rollers. There are knife teeth for cutting on the rollers; the output of the knife-toothed double-roller crusher falls evenly on the total clean coal belt, and the discharge end of the total clean coal belt is obliquely below, along the track of material movement. There are three layers of squirrel-cage mixers, which are used to mix the press filter coal slime and gravity-selected coarse-grained coal. The mixed materials fall to the belt in the upper warehouse, and at the discharge end of the belt in the upper warehouse, along the moving direction of the belt, There are left material guide plate, middle material guide plate and right material guide plate arranged on the left, middle and right respectively. Under the action of the material guide plate, the materials are scattered and fall into different positions of the product bin.

The rolling elastic connecting rod primary crushing device includes 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 the two ends of the rolling elastic connecting rod are fixed It is on the frame and cannot move laterally along the frame, but it can move circularly around the fixed point; there are guide rails above the supports on both lateral sides of the frame, and the leveler driven by a chain can reciprocate on the guide rails lateral movement.

A plurality of outlets are provided between the upper layer of the double-layer scraper machine and the lower layer of the double-layer scraper machine, for materials to disperse and fall onto the scraper plate of the double-layer scraper machine.

The three-layer squirrel cage mixer comprises an outer layer agitator, a middle layer agitator, an inner radial rib and a central sleeve; Composition; the middle layer agitator is composed of the middle horizontal stirring ribs and the circumferential stirring ribs; the outer layer agitator and the middle layer agitator are connected in series by the inner radial ribs, and the other internal radial ribs One end is fixedly connected to the central casing, and a rotating shaft is arranged in the central casing, and the rotating shaft is connected to the kinetic energy output end of the reducer, and the reducer is driven by a motor.

The beneficial effects of the utility model are:

The utility model is reasonable and effective in the process system design, and the whole process system includes a filter cake crushing system of a filter press and a material uniform mixing system.

1. Filter cake crushing system of filter press: The filter cake of the multi-stage pull-off filter press relies on its own gravity to impact the rolling elastic connecting rod during the unloading process. Under the action of the impact force, the whole filter cake is broken into small pieces. Due to the certain elasticity and toughness of the rolling elastic connecting rod, the crushed slime block is also subject to an upward rebound force, which forms a secondary collision with the falling slime, further promoting the crushing and loosening of the material. In order to prevent the material from collecting in the chute In piles, the rolling elastic connecting rod is designed so that it can perform circular rolling motion around the fixed point, which reduces the probability of material accumulation in the chute. The moving coal leveler, the leveler moves reciprocatingly and laterally periodically, completely eliminating the phenomenon of material accumulation in the chute; the preliminary crushed material is transported by double-layer scraper machine. The advantage of double-layer scraper machine is that the upper layer is used for storage For the primary crushed material, the lower layer is used for the scraper to continuously transport the material. It is very good to convert the intermittent concentrated discharge of the filter press into continuous dispersed discharge, which provides space and time for the work of the low-speed disc feeder. The above conditions are provided, on the one hand, avoiding the accumulation of materials in the low-speed disc feeder, on the other hand, prolonging the material conveying time, which provides a prerequisite for the low-speed disc feeder to work at a speed lower than 2r/min; low speed The disc feeder strictly controls the discharge volume at low speed and low opening of the lower material port, which creates good conditions for the deep and fine-grained crushing of massive coal slime; the knife-toothed double-roller crusher is used to crush the coal slime, and the roller The cutter teeth for cutting are installed on the wheel, which can effectively break the massive coal slime into fine-grained coal slime, and provide conditions for the uniform mixing of materials in the next step.

2. The material realizes "two steps" in the uniform mixing system. First, it is "mixed". The fine-grained coal slime evenly falls onto the continuously running total clean coal belt, forming a thin layer on the upper layer of the gravity-selected coarse coal. A layer of coal slime; followed by "mixing", in order to fully mix the broken coal slime and gravity-selected coarse coal to form a homogeneous product; obliquely below the discharge end of the total clean coal belt, along the trajectory of material movement There are three layers of squirrel-cage mixers arranged on the top. The three-layer squirrel-cage mixer includes an outer layer agitator, a middle layer agitator, an inner radial rib and a central sleeve. The outer layer agitator and the middle layer agitator are connected in series by the inner radial ribs, and the other end of the inner radial ribs is fixed on the central casing, and the central casing is formed into a circle. Cylindrical shape, on the one hand, prevents the material from directly passing through the three-layer squirrel cage mixer to form "stringing" during the feeding process, and on the other hand, protects the rotating shaft installed inside. The speed of the rotating shaft can be adjusted by the reducer, and the reducer relies on the motor Driven, the outer layer agitator, the middle layer agitator and the center casing form a three-layer stirring effect, which realizes the uniform mixing of the broken coal slime and gravity-selected coarse-grained coal; At the discharge end of the belt in the upper warehouse, along the moving direction of the belt, there are left, middle and right guide plates respectively arranged on the left, middle and right guide plates. Under the action of the guide plates, the materials fall into the The different positions of the product bins and the method of dispersing the blanking points eliminate the problem of coal slime sticking caused by centralized blanking, and further improve the uniformity of blending.

Description of drawings

Fig. 1 is the equipment arrangement contact diagram of the present utility model.

Fig. 2 is the process flow chart of the utility model.

Figure 3 is a front view of the structure of the three-layer squirrel cage mixer.

Figure 4 is a top view of the structure of a three-layer squirrel cage mixer.

The meanings of the marked symbols in the figure are as follows:

A-multi-stage pull-off filter press A1-feeding chute B-rolling elastic connecting rod primary crushing device

B1-Rolling elastic connecting rod B2-Frame B3-Guide rail B4-Leveler

C-Double-layer scraper C1-The upper layer of the double-layer scraper C2-The lower layer of the double-layer scraper

C3-Outlet D-Low-speed disc feeder D1-Hydraulic gate

E-knife tooth double roll crusher E1-roller E2-knife tooth F-total clean coal belt

G-three-layer squirrel cage mixer G1-outer layer agitator G11-horizontal mixing ribs

G12-Circumferential Stirring Ribs G2-Middle Stirrer G21-Transverse Stirring Ribs

G3-Inner Radial Rib G4-Central Sleeve G41-Rotating Shaft G42-Reducer

G43-motor H-upper belt H1-middle material guide H2-left material guide H3-right material guide

I-Product Warehouse

detailed description

For ease of understanding, here in conjunction with Fig. 1-4, the specific embodiment of the present utility model is further described as follows:

The specific components of the utility model are divided into two systems: the filter cake crushing system of the filter press and the material uniform mixing system. The filter cake crushing system of the filter press includes a multi-stage pull-off filter press A, a rolling elastic connecting rod primary crushing device B, a double-layer scraper machine C, a low-speed disc feeder D, and a knife-toothed double-roller crusher E; The material uniform mixing system includes the total clean coal belt F, the three-layer squirrel cage mixer G, the upper warehouse belt H and the material guide plate; the following describes them one by one:

1. Filter cake crushing system of filter press

(1), multi-stage pull-off filter press

The flotation foam enters the multi-stage pull-off filter press A to complete dehydration and form a press filter cake, which is quickly discharged by means of multi-stage pull-off.

(2), rolling elastic connecting rod primary crushing device

The rolling elastic connecting rod primary crushing device B is arranged in the discharge chute A1 of the filter press, relying on the self-weight impact of the slime filter cake during the unloading process, the rolling elastic connecting rod B1 completes the crushing of the filter cake, because the rolling elastic connecting rod B1 has With a certain degree of elasticity and toughness, after the material hits the rolling elastic connecting rod B1, it is also subjected to the secondary action of the rebound force and the collision effect of the relative movement between the materials, which further promotes the breaking and loosening of the material, and the rolling elastic connecting rod B1 itself can make a circular roll around the fixed point Movement reduces the probability of material accumulation in the chute. At the same time, a coal leveler B4 that uses a chain drive and can move laterally on the guide rail B3 above the frame B2 is set in the chute. The coal leveler B4 periodically reciprocates laterally. Completely eliminate the phenomenon of material accumulation in the chute.

(3), double layer scraper machine

The materials crushed by the rolling elastic connecting rod primary crushing device B enter the double-layer scraper machine C. The upper layer C1 of the double-layer scraper machine is used to store the primary crushed materials, and the upper layer C2 of the double-layer scraper machine is used for continuous scraping. For transporting materials, the adoption of the double-layer scraper machine C is a good way to convert the intermittent centralized discharge of the filter press into continuous dispersed discharge. In addition, there are multiple layers between the upper and lower layers of the double-layer scraper machine A discharge port C3 is used for the material to disperse and fall onto the scraper of the lower scraper machine, so as to prevent the primary crushed material from re-bonding into blocks due to high moisture and high viscosity.

(4), low speed disc feeder

The output of the double-layer scraper machine enters the low-speed disc feeder D, and the working speed of the low-speed disc feeder is lower than 2r/min. A hydraulic gate D1 is installed at the discharge port of the low-speed disc feeder. It is used to adjust the opening degree of the discharge opening of the disc feeder, effectively control the discharge volume, and create good conditions for the deep and fine-grained crushing of massive coal slime.

(5), knife-tooth double-roll crusher

The knife-tooth double-roller crusher E includes opposite-moving rollers E1, on which are installed cutter teeth E2 for cutting, which can effectively break lumpy coal slime into fine-grained coal slime for the next step of material crushing. Uniform mixing provides conditions.

2. Material uniform mixing system

(1), total clean coal belt

The output of knife-tooth double-roller crusher E evenly falls onto the continuously running total clean coal belt F, forming a thin layer of coal slime on the upper layer of gravity-selected coarse-grained coal, and completes the separation of broken coal slime and gravity separation. Preliminary blending of coarse coal.

(2), three-layer squirrel cage mixer

In order to fully mix the broken coal slime and gravity-selected coarse-grained coal to form a homogeneous product, a three-layer squirrel-cage mixer is arranged obliquely below the discharge end of the total clean coal belt F and along the track of material movement. G, the three-layer squirrel cage mixer G includes the outer layer agitator G1, the middle layer agitator G2, the inner radial rib G3 and the central sleeve G4, the outer layer agitator G1 is composed of the outermost horizontal stirring rib G11 It is composed of the circular stirring rib G12, the middle stirrer G2 is composed of the middle horizontal stirring rib G21 and the circumferential stirring rib (G12), the outer stirrer G1 and the middle stirrer G2 are connected in series by the inner radial rib G3 Connected, the other end of the inner radial rib G3 is fixed on the central sleeve G4, and the central sleeve G4 is cylindrical, on the one hand, it prevents the material from directly passing through the three-layer squirrel cage mixer G during the feeding process. On the other hand, it protects the rotating shaft G41 installed inside. The speed of the rotating shaft G41 can be adjusted by the reducer G42. The reducer G42 is driven by the motor G43. Under the joint action, the broken coal slime and gravity-selected coarse-grained coal are evenly mixed.

(3) Upper warehouse belt H and material guide plate

The evenly mixed materials are reloaded and transported to the product bin I by the upper bin belt H. At the discharge end of the upper bin belt H, along the moving direction of the belt, the left, middle and right are respectively arranged with a left material guide plate H2 and a middle material guide plate. H1 and the right material guide plate H3, under the action of the material guide plate, the material disperses and falls into different positions of the product bin I. The method of dispersing the material blanking point eliminates the problem of coal slime adhesion caused by concentrated material blanking, and further improves the mixing efficiency. With uniformity.

Claims (4)

1. A system that press filter coal slime cake and heavy-election coarse-grained coal are evenly blended, comprise multi-section pull-off type filter press (A), it is characterized in that also comprising following component: the blanking chute of filter press ( A1) is equipped with a rolling elastic connecting rod primary crushing device (B), which relies on the self-weight impact of the slime filter cake during the unloading process on the rolling elastic connecting rod (B1) for primary crushing; the primary crushed material falls into the double crushing device arranged below. Layer scraper machine (C), the upper layer (C1) of the double-layer scraper machine is used for local material storage, and the lower layer (C2) of the double-layer scraper machine is used for transportation; the materials conveyed by the double-layer scraper machine (C) enter Low-speed disc feeder (D), the working speed of the low-speed disc feeder (D) is lower than 2r/min, and a hydraulic gate (D1) is set at the discharge port of the low-speed disc feeder (D) , used to control the amount of feeding; the feeding of the low-speed disc feeder (D) enters the knife-toothed double-roller crusher (E), and the knife-toothed double-roller crusher (E) includes opposite-moving rollers (E1 ), the cutter teeth (E2) for cutting are installed on the rollers (E1); the discharge of the cutter-toothed double-roller crusher (E) falls evenly onto the total clean coal belt (F), and the total clean coal belt ( The discharge end of F) is obliquely below, and a three-layer squirrel-cage mixer (G) is arranged along the track of material movement, which is used to mix the press filter coal slime and gravity separation coarse coal, and the mixed material falls to the top The warehouse belt (H), at the discharge end of the upper warehouse belt (H), along the moving direction of the belt, the left, middle and right are respectively arranged with a left guide plate (H2), a middle guide plate (H1) and a right guide The material plate (H3), under the action of the material guide plate, the material disperses and falls into different positions of the product bin (I). 2. a kind of press filter coal slime cake according to claim 1 and the system that the re-election coarse-grained coal is uniformly blended, it is characterized in that: described rolling elastic connecting rod primary crushing device (B) comprises rolling elastic connecting rod ( B1) and the 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 the two ends of the rolling elastic connecting rod (B1) are fixedly connected It is on the frame (B2) and cannot move laterally along the frame (B2), but it can make circular motions around the fixing points; guide rails (B3) are arranged above the lateral two sides of the frame (B2), using The coal leveler (B4) driven by the chain can make reciprocating lateral movement on the guide rail. 3. A system for evenly blending filter press slime cake and heavy-election coarse-grained coal according to claim 1, characterized in that: the upper strata (C1) of the double-layer scraper machine and the double-layer scraper machine There are multiple outlets (C3) between the lower layer (C2) for materials to disperse and fall onto the scraper of the scraper machine. 4. A system for uniformly blending filter press slime cake and gravity-selected coarse coal according to claim 1, characterized in that: said three-layer squirrel-cage mixer (G) includes an outer layer agitator (G1), the middle stirrer (G2), the inner radial ribs (G3) and the central sleeve (G4); Stirring ribs (G12) are composed; the middle layer agitator (G2) is made up of the middle horizontal stirring ribs (G21) and the circumferential stirring ribs (G12); the outer layer agitator (G1) and the middle layer agitator ( G2) The inner radial ribs (G3) are connected in series, and the other end of the inner radial ribs (G3) is fixed on the central sleeve (G4), and the central sleeve (G4) is provided with a rotating shaft ( G41), the rotating shaft (G41) is connected to the kinetic energy output end of the reducer (G42), and the reducer (G42) is driven by the motor (G43).