RU2475306C2 - Jigger - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to mining, particularly, to processing minerals, and may be used in dressing of coal and ores of ferrous and nonferrous metals. Jigger consists of rock compartment and middlings compartment and has loader, housing, jigging screen, pulsators, unloader with controller, and dewatering elevators. Middlings compartment boards are secured at bottom section by sealed hinges to housing. Top section are hinged by articulated metal links with eccentric drive on one side and, on opposite side, with boards and clevis to provide for synchronous reversal vibrations at top section of boards in fluid upstream and downstream flows.

EFFECT: higher efficiency of separation.

2 dwg

Description

The invention relates to the processing and enrichment of minerals and can be used in the enrichment of coal and ores of ferrous and non-ferrous metals.

Jigging machines have high productivity and enrichment efficiency, are easily automated and have a wide scale of enriched material fineness from 0.5 to 120 mm. Owing to the indicated advantages, depositing machines are widely used in enrichment processes; moreover, when coal is enriched with deposit, more than 50% of the total volume of coal is enriched [1].

The essence of the jigging process is to separate the source material according to the density in vertical alternating fluid flows. In the period of an upward fluid flow, the initial mass (bed) is brought into a loose state, i.e. particles of solid material rise and flow for a certain time in a suspended state, while the distance between them increases significantly. It is during periods of repeated loosening that the material is divided into densities, i.e. in the upper layers of the bed, light fractions are concentrated, and in the lower layers - heavy fractions.

Therefore, the process of loosening is the main condition for the operation of jigging machines. At the same time, it has been established by numerous experimental data that the process of loosening should be carried out without fluid turbulence by smooth ascending flows.

In the longitudinal direction, by the movement of the liquid and the material being enriched, the jigging machine is divided into two compartments: pedigree and industrial products. In the breed department on the depositor there is a separation into two layers: at the top there are light and intermediate products, and below are heavy ones that are discharged from the machine by bucket dehydrating elevators. In the industrial section on the depositing screen, separation is also made into two layers, but here there are light fractions (concentrate) at the top and industrial product below. Light fractions are discharged from the machine by a fluid stream, and industrial product is discharged by dewatering bucket elevators.

The jigging sieve is fixed in the upper part of the jigging machine at a height from the upper edge of the sides of 700-800 mm, i.e. the bed in the oversize space is limited by the side walls, and in unloading - by a drain threshold.

At the Sholokhovskaya processing plant, samples of concentrate were taken over the entire width of the drain threshold. As a result of testing, it was found that in the center of the drainage threshold, the ash content of the concentrate is lower by 0.2-0.4% compared with the concentrate taken directly from the sides of the jigging machine. This indicates that at the sides of the machine loosening of the bed is less effective than in the center of the sieve. The reason for this is the contact of the material with the sides during ascending and descending fluid flows, as a result of which there is additional resistance to separation processes. In order to prevent this, a laboratory jigging machine with expanding sides was manufactured and tested. But the expected effect of improving the separation processes was not obtained, due to the fact that with an upward flow of fluid, the loosening of the bed really increases, since the bed, breaking away from the sieve and moving upwards, enters into a large volume due to the expansion of the sides. But with a downward flow, the boundary material with the sides settles on their surface, and thereby creates additional resistance to the separation processes much greater than with the vertical position of the sides [2]. Jigging machine with expanding sides adopted as a prototype of the present invention.

From the above it follows that to increase the loosening of the bed directly at the sides of the jigging machine, it is necessary to increase the volume of the machine in which the bed is located with upward flows of liquid, and reduce it with downward flows of water.

This can only be achieved if the sides of the jigging machine in the industrial section will alternately expand outward during the upward flow and taper inward during the downward flow.

The aim of the present invention is to develop such a design of the jigging machine, in which there is an effective loosening of the bed over the entire area of the sieve, including the border with the sides of the zone, which ultimately will reduce the total ash content of the concentrate by 0.2-0.3%.

This goal is achieved by the fact that in the industrial product compartment the sides of the jigging machine are fixed with hermetic joints and are driven in alternating oscillatory movements by an eccentric drive synchronously with upward and downward fluid flows.

The invention is illustrated by drawings (figure 1 and figure 2).

In Fig.1 shows a diagram of the jigging machine with movable sides when viewed from above, and Fig.2 shows a section of the machine along axis AA.

The proposed jigging machine consists of a pedigree and industrial product compartments, a loading device, an unloading device with automatic controls, a housing, a depositing sieve, pulsators and dewatering elevators.

A frame 8 is installed above the center of the sieve 10 in the longitudinal direction of the industrial product compartment. A shaft 5, an earring 4 is mounted on it from below on the hinges. Both ends of the earring are pivotally connected through metal rods 2 to the sides 1 of the jigging machine. The sides of the jigging machine are secured with hermetic hinges with the lower parts 9. The conveyor belt fixed to the sides and the machine body using bolts 13 is hermetic hinges.

Alternating oscillations of the upper part of the sides are made by an eccentric drive consisting of a disk 7, a gearbox 11 and an electric motor 12. The eccentric drive 7 is connected by a rod 6 to the jigging board via a hinge 3. When the eccentric drive rotates, the rod 6 exerts pressure on the side of the machine, which is connected to the rod 2 and by earring 4. When pushing by traction 6, the side of the machine with its upper part will advance into the machine. At the same time, with his movement from himself, he will turn the earring, and she will pull the other side of the machine inwards through the rod 2 with her other end.

When the eccentric drive begins to move the side of the machine to the outside, the opposite end of the earring will push the other side of the machine also to the outside.

Thus, from one eccentric drive, both sides of the jigging machine move synchronously either to the outside or to the inside. In this case, the eccentric drive motor must be interlocked with pulsators providing both ascending and descending flows of water. With an upward flow of fluid, the sides of the machine should move in the outer sides, and with a downward flow, inside the machine.

Alternating movements of the sides create an alternating change in volumes in the oversize space of the jigging machine, providing a favorable environment for separation processes.

With an upward flow of liquid due to the expansion of the sides, the volume of the oversize space will increase, and this ensures an effective increase in loosening of the bed. With a downward flow of liquid on the sides of the machine, the boundary layer of material is pushed towards the center of the sieve with its movements inward, thereby reducing the contact resistance of the material with the sides. In addition, when the sides move inside the machine, heavy material particles will receive an additional impetus to their initial deposition rate.

Thus, the proposed design of the jigging machine with movable sides during its modernization will not require large financial expenses, as conveyor belts are used as a sealed hinge of the sides, and any drive of oscillating feeders can be used as a drive.

These costs will quickly pay off, since reducing the ash content of the concentrate even by 0.1% will increase its commercial price and ensure a high annual economic effect.

Literature

1. Technique and technology of coal preparation. Reference Guide Ed. V.A. Chanturia and A.R. Molyavko. M .: Nauka, 1995.

2. Samylin N.A., Zolotko A.A., Pochinok V.V. Jigging. M .: Nedra, 1976.

Claims (1)

The jigging machine, consisting of a pedigree and industrial product compartments and having a loading device, a housing, a jig sieve, pulsators, an unloading device with automatic controls, dewatering elevators, characterized in that the sides of the product section are fixed on the body with hermetic hinges, and the upper parts are connected by hinges metal rods on the one hand with an eccentric drive, and on the other with sides and an earring, which provides synchronous alternating oscillations in the upper part comrade during ascending and descending liquid flow, increasing the efficiency of separation processes.

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