RU2491125C1 - Gyro grinder to determine natural grading of rocks - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: gyro grinder comprises grinding table and roll interacting therewith. Roll power drive comprises base and horizontal platform with balance weights and degree gyro composed of motor with shaft and flywheel. Truncated cone of central loader is secured at horizontal platform cylindrical case. Horizontal platform cylinder connects said platform with power drive and is secured at driver support to turn about vertical axis. Grinding table cylinder is fixed at power drive base coaxially with horizontal platform cylinder and there inside with clearance. Rock central splitter is composed of a cone mounted at grinding table center. Grinding wheel is arranged inside grinding table cylinder in one horizontal plane with horizontal platform and is solid with no perforations.

EFFECT: grinding of rocks solely by gyration.

1 dwg

Description

The invention relates to mining, in particular, to devices for grinding rock and determining its natural particle size distribution, the knowledge of which determines the percentage yield by weight of minerals from a unit mass of the feedstock, the cost of the final product and the amount of specific energy consumption.

A well-known dry rock grinder, during operation of which a gyroscopic effect is used, comprising a grinding table, a roller with a lever interacting with the grinding table, a power drive for rotating the roller, a horizontal platform with balancing weights, a support for the roller lever and a two-stage gyroscope. In the grinder, the main gyroscopic force, which presses the roller to the working table with the rock placed on it, is created due to the reaction of a two-stage gyroscope [1].

A disadvantage of the known technical solution is the peripheral location (outside the horizontal platform) of the grinding table, which significantly increases the size of the gyroscopic chopper and its weight. In addition, this arrangement of the grinding table significantly increases the moment of friction forces arising due to the friction of the roll on the surface of the grinding table, which significantly increases the power and, accordingly, the dimensions of the power drive for rotating the horizontal platform, and therefore the dimensions and weight of the whole grinder as a whole.

The closest in technical essence and the achieved result is a gyroscopic shredder with a central rock loading, during operation of which a gyroscopic effect is used, comprising a grinding table, a roller with a lever interacting with the grinding table, a power drive for rotating the roller with a base, a horizontal platform with balancing weights, support for the roll axis and a two-stage gyroscope in the form of an electric motor with a shaft and a flywheel, a cylindrical casing of a horizontal platform with a mounted on it with a bounded cone of the central loading device, a cylinder of a horizontal platform connecting the horizontal platform with a power drive and fixed at the base of the power drive with the possibility of rotation around a vertical axis, a discharge truncated cone and a discharge cone cylinder, wherein the discharge cone is installed inside the cylinder of the discharge truncated cone, fixed at the base of the power drive coaxially with the cylinder of the horizontal platform and placed inside it with azoor, the central rock divider, made in the form of a cone and installed in the middle of the grinding table, the grinding table is placed inside the cylinder of the discharge truncated cone in the same horizontal plane as the horizontal platform, and the grinding table is perforated, through the holes of which the crushed rock falls into truncated discharge cone and further into the hopper [2].

The disadvantages of the known grinder is its insufficiently high productivity due to the low speed of rotation of the roll relative to the crushed rock, which determines the time of direct contact of the rock with the roll, as well as its volume, which is currently directly involved in the process of its abrasion.

In addition, due to the fact that the grinding table is perforated, through the holes of which the crushed rock enters the discharge truncated cone and then into the hopper, the rock is abraded to the size of the fraction passing through the perforated holes, which does not allow to determine the natural granulometric composition of the rock .

The technical result of the invention is the creation of a gyroscopic grinder for determining the natural particle size distribution of rocks of different hardness according to the M. M. Protodyakonov scale.

The specified technical result is achieved by the fact that the gyroscopic grinder for determining the natural granulometric composition of rocks contains a grinding table, a roller with a lever interacting with the grinding table, a power drive for rotating the roller by rolling, a horizontal platform with balancing weights, a support for the axis of the roll and a two-stage gyroscope in the form an electric motor with a shaft and a flywheel, a cylindrical casing of a horizontal platform with a truncated cone of the central loading unit mounted on it a cylinder of a horizontal platform connecting the horizontal platform with the power drive and fixed at the base of the power drive with a ball bearing rotatably around the vertical axis, the grinding table cylinder fixedly fixed at the base of the power drive coaxially to the cylinder of the platform horizontally and placed inside with a gap, central a rock divider made in the form of a cone and installed in the middle of the grinding table, and the grinding table is placed inside the grinding mill cylinder about the table in the same horizontal plane as the horizontal platform, while the grinding table is made continuous without perforations with the possibility of abrasion of the rock solely due to gyroscopic forces and determine the natural particle size distribution, which ensures the safety of all fractions of the rock obtained in the process abrasion and determining its natural particle size distribution.

The invention is illustrated by the drawing, which shows a General view of the gyroscopic grinder for determining the natural particle size distribution of rocks, including 1 - the electric motor of the working platform, 2 - base, 3 - horizontal platform, 4 - support, 5 - hinge, 6 - electric motor with shaft, 7 - flywheel, 8 - roller, 9 - lever, 10 - grinding table, 11 - balancing weights, 12 - cylindrical casing, 13 - truncated cone of the central loading device, 14 - cylinder of the horizontal platform, 15 - ball bearing, 16 - grinding cylinder nnogo table, 17 - the central divider of the loaded rock; 18 - crushed rock.

The device comprises a power drive 1 of rotation of the roll 8 around a vertical axis with a base 2, a horizontal platform 3, a support 4 with a hinge 5, an electric motor with a shaft 6 and a flywheel 7, a roll 8, a roll lever 9, a grinding table 10, on which the crushed rock 18 , which after grinding remains on the grinding table. An electric motor with a shaft 6 and a flywheel 7 mounted on a roll lever 9 and pivotally connected to a support 4 form a two-stage gyroscope.

To balance the gyroscopic chopper during rotation around a vertical axis, the device can be equipped with balancing weights 11 installed on a horizontal platform 3.

The horizontal platform 3 is covered by a cylindrical casing 12 with a truncated cone of the central loading device 13 mounted on it. In turn, the horizontal platform 3 is mounted on the cylinder 14, through which it is kinematically connected to the power drive 1. The cylinder 14 is mounted in a ball bearing 15. In addition, the base 2 coaxially to the cylinder 14 of the horizontal platform 3 fixedly mounted cylinder 16 of the grinding table 14.

To determine the natural granulometric composition of the rock, the grinding table 10 is made continuous without perforations, grinding is carried out so that all fractions of the rock obtained in the process of its abrasion and determining its natural granulometric composition remain on the grinding table.

A gyroscopic grinder for determining the natural particle size distribution of rocks works as follows:

the power drive 1 untwists the horizontal platform 3 with the roll 8 installed on it to an angular velocity Ω about the vertical axis of rotation, the electric motor 6 untwists the flywheel 7 to the angular velocity ω, the vector direction of which coincides with the direction of the lever 9 of the roller 8. At the same time, the gyroscope acts on a two-stage gyro moment, the value of which is determined by the formula

$I{M}_{g}I=J_{m}x\omega x\Omega xsin\alpha ,\text{(one)}$

where J _m = m _{m m} R ^2/2 - the moment of inertia of the flywheel 7, m and R _{m m} - respectively the mass and radius of the flywheel 7, α - angle between the vectors ω and Ω.

On the roll 8 acts vertical gyroscopic force F _d equal to

$I{F}_{d}I=I{M}_{g}I/l_{\mathrm{one}}=J_{m}x\omega x\Omega xsin\alpha /l_{\mathrm{one}},\text{(2)}$

where l ₁ is the distance from the hinge 5 and to the center of the roll 8. The direction of this force is determined by the sign of the trigonometric function.

From relations (1) and (2) it follows that, by changing ω and Ω independently from each other, it is possible to change the value of the gyroscopic force F _d in a wide range of values.

The crushed rock 18 through a truncated cone of the Central loading device 13 falls on the grinding table 10, which is made continuous without perforations and through which it is evenly distributed using the central divider 18. When abrasion on the grinding table, the rock is disintegrated so that all fractions of the rock, obtained in the process of its abrasion and determining its natural composition, remained on the grinding table, which ensures the receipt of the natural granulometric composition of the mountain pore odes.

The stability of the proposed device is determined by the fact that with an increase in the resistance of the crushed rock to the movement of the roll 8 along the grinding table, the specified value of the angular velocity Ω decreases, which, in turn, according to formula (1), leads to a decrease in the gyroscopic moment, and hence the value the gyroscopic force F _d , which provides an increase in the value of the angular velocity Ω to a predetermined value.

Thus, from the point of view of the theory of automatic control, the proposed device is an automatic device with negative feedback, which ensures its stable operation.

Information sources

1. Trubetskoy K.N., Bobin V.A., Vaysberg L.A., Voronyuk A.S., Lanyuk A.N. RF patent №2248242 "Gyroscopic shredder of dry rock", 2005, bull. No. 8 (analog).

2. Bobin V.A., Pokamestov A.V., Bobina A.V., Lanyuk A.N. RF patent No. 2429912 "Gyroscopic shredder with a central rock loading", 2011, bull. No. 27 (prototype).

Claims (1)

A gyroscopic chopper containing a grinding table, a roller with a lever interacting with the grinding table, a power drive for rotating the roll with a base, a horizontal platform with balancing weights, a support for the roll axis and a two-stage gyroscope in the form of an electric motor with a shaft and a flywheel, a cylindrical casing of a horizontal platform with a fixed on it with a truncated cone of the central loading device, a horizontal platform cylinder connecting the horizontal platform with the power drive and fixed in the base the power drive using a ball bearing with the possibility of rotation around a vertical axis, the grinding table cylinder, fixed at the base of the power drive coaxially with the horizontal platform cylinder and placed inside it with a gap, the central rock divider, made in the form of a cone and mounted in the middle of the grinding table, the grinding table is placed inside the cylinder of the grinding table in the same horizontal plane as the horizontal platform, characterized in that the grinding table is made solid, without perforations, with abrasion of rock exclusively at the expense of gyroscopic forces and determining the natural size distribution.

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