SU1373451A1 - Centrifuge for dehydration of granular materials - Google Patents

Abstract

The invention relates to centrifuges for the dewatering of granular materials, can be used in the mining, coal and other industries and is aimed at productivity. When the drive is turned on, the rotor 2 with the drums 4 begins to rotate. The filter element 5, made in the form of an endless flexible belt, is pressed by maximum centrifugal forces to the outermost wall of the drum 4, thereby engaging in the rotational

Description

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movement and rolling rollers 6 and 7, placed inside drum D in the zone of minimal centrifugal forces (the closest part of the drum 4 to the axis of the rotor 2). The axis of the tube I1 is located between the axes of the drum A and the rotor 2 in the same plane with them. The tube 1I is installed in such a way that it creates, together with the rollers 6.7, the bend of the filter element 5. The raw material is fed by the second roller 6 along the rotation of the drum 4 by the roller 6 and is pressed by the centrifugal forces increasing as the drum A rotates And the filter element 5.

passing through the filter element 5 and the drum 4, enters the corresponding collection, and the filtered sediment approaches the placement area of the rollers 6, 7 and tube 1 I, and loosens and cleaves with the rollers 6 and 7 and created by the bend, is dropped into the corresponding collection . The air supplied to the apertures of the tube 11 cleans the clogged cells of the filter element 5. This ensures the removal of sediment and the cleaning of the filter elements 5 during the centrifuge operation, which leads to an increase in the centrifuge capacity. 2 Il.

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The invention relates to a technique for dewatering and drying fine-grained materials by centrifuging them and can be used in ore dressing, coal, metallurgical, and other industries, in particular for dewatering, for example, coal or ore-containing pulp.

The purpose of the invention is to increase the productivity of the centrifuge by simultaneously removing sediment and filter elements during operation.

Fig, I schematically shows the proposed centrifuge, longitudinal section; figure 2 is the same, top view with a local transverse section of one of the drums.

The centrifuge contains an actuator 1, a rotor 2 comprising a base 3 and a number of drums 4 with filter elements 5 installed rotatably around the axis of the rotor 2 and around their own axes. Each filter element 5 is made in the form of an endless flexible belt and inside each drum 4 there are two rollers 6 and 7, the axes of which are rigidly connected to the rotor 2, for example, brackets 8 and radially spring-loaded springs 9 In addition, inside each drum 4 there is a rigidly attached to the base 3 of the rotor 2 by a clamp 10 a tube 1I for bending the filter element 5 having a number of holes 12

for supplying air to the filter element 5. The tube II is fixed so that its axis is located in a plane passing through the axes of rotation of the drum 4 and the rotor 2 between them, while the angle between between the planes passing through the axis of rotation of the drum 4 and each roller 6 and 7 is 50-80. The centrifuge also contains a power supply device 13 rigidly connected with the rotor 2 with nozzles 14. At the base 3 of the rotor 2, slots 15 are made to allow sediment to pass to collector 16 and slots 17 to drain the filtrate to collector 18.

The centrifuge works as follows.

When the drive I is turned on, the rotors 4 installed rotatably around their axes and around the axis of the rotor 2 and kinematically connected with the rotor 2 begin to rotate. The filter element 5, pressed against the walls of the drum 4 in the zone of maximum centrifugal forces, is also involved in rotational motion due to friction forces, during which it rolls in rollers 6 and 7, on which it is pulled, and is bent using tube 1I. Rollers 6 and 7 and tube P, to which air begins to be supplied, are installed in the zone of action of minimum centrifugal forces. Source material supplied

the filter element 5 through the pipe 14, installed inside the drum 4 after the roller 6 in the course of rotation of the drum 4, begins to be pressed to it under the action of centrifugal forces. In the zone of maximum centrifugal forces, the most intense separation of the liquid phase from the solid occurs. The filtrate, the passage through the cells of the filter element 5 and the drum 4, through the slots 17 enters the collection 18.

Rollers 6 and 7 installed in the zone of minimum centrifugal forces and tube 1I for bending the filter element 5 loosening and chipping the filtered sediment, which through the slots 15 falls into the collector 16. The air coming out of the holes 12 of the tube 11 cleans the clogged cells of the filter element 5. Created air cushion between the tube 11 and the filter element 5 protects the latter from rapid wear due to friction on the tube 11, and the springiness of the rollers 6 and 7 protects them from damage, while the degree of loosening liruets stiffness springs 8 and 9.

The magnitude of the zone of action of the minimum centrifugal forces is determined by the angle 06, formed by planes passing through the axis of the drum 3 and each of the rollers 6 and 7. The value of this angle is determined experimentally and the coupling.

is 50-80. Oi angle reduction

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(less than 50) leads to constructive difficulties in placing the rollers 6 and 7 and the tube I1 to bend the filter element 5. Increasing the angle about (more than 80) leads to an unreasonable reduction of the zone in which

centrifugal filtration, which in the final 45 centrifugal forces, reaches the maximum result adversely affects the performance of the centrifuge.

As a result of the rotation of the drums around the axis of the rotor and around its own axes, the bodies placed in the drums are affected by the resulting centrifugal forces that are not the same in magnitude. At the points furthest from the rotor axis, they are maximal, so

as here the centrifugal forces, arising from the rollers and due to the presence of curvature from the two rotational movements (kinks) of the filter element, add up, which creates favorable conditions for the centrifugal filter and causes the filter to be loosened, cleaved and discharged into the appropriate collection. , full. At the closest points

centrifugal forces are minimal, since they are subtracted. At these points, the most favorable conditions are created for unloading the filtered sludge. The angle cA, equal to 50-80, determines the magnitude of the zone of action of the minimum resulting centrifugal forces. The rollers and the tube for bending the filter element in the form of an endless flexible ribbon are placed in this zone. The rollers are placed in such a way that the angle formed by the planes passing through the axis of rotation of the drum and each of the rollers is 50-80, and the axis of the tube is located between the axes of rotation of the drum and the rotor in the same plane.

0 The filter element, located loosely inside the drum, is subject to centrifugal forces. In the zone of maximum resulting centrifugal forces, the filter element is pressed against the walls of the drum and, as a result of friction forces, is drawn into rotational motion. Tightening with rollers and changing your curvature, the filter element is in the process of its

0 rotational movement runs them around. The injected air through the holes in the tube creates a kind of air cushion, which participates in creating the bend of the element, cleans the clogging of the filter cell and prevents the filter from rubbing against the tube. With such a complex rotational motion of the drums and a specific arrangement of the rollers, it is obvious that it is rational to feed the source material behind the second roller in the direction of rotation of the drum. In this case, the material being filtered is pressed all the more as the drum rotates around its axis.

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the effect of centrifugal forces, and then enters, in the zone of decreasing centrifugal forces.

The residence time in the zone of maximum centrifugal forces is determined by the speed of rotation of the drum around its axis. Go to the rollers, already filtered sediment using

rollers and due to the presence of curvature (kink) of the filter element

It begins to loosen, peel off and be discharged into the corresponding collection, and the air-blown filter is full513

stew is cleaned. All this ensures the removal of sediment and the cleaning of each filter element in the process, which leads to an increase in centrifuge productivity.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A centrifuge for dewatering granular materials comprising a rotor, IQ comprising a base and a number of drums with filter elements mounted rotatably around the rotor axis and around their own axes, a feeding device and collectors of ozone fractions, characterized by L5 so that, in order to increase productivity, each filtering element is designed as an endless flexible ribbon, rollers and a tube rigidly attached to the rotor base to bend the filtering element are located inside each drum, and the tube has a number of holes for supplying air to the filtering element and its axis is located in a plane passing through the axes of rotation of the drum and the rotor between them, wherein the angle between the planes passing through the axis of rotation of the drum and each roller is 50-80 °. fig