SU1407584A1 - Arrangement for screening loose materials - Google Patents

Abstract

The invention relates to the separation of bulk materials (M) by size and is intended for the coal, construction, oil and other industries. The purpose of the invention is to simplify the construction and increase the efficiency of the separation of M by size by using the rotation of the vibrator (B) to move the grid (C) and excite the wave oscillations in it. Made in the form of an infinite canvas C covers the leading 3 and driven stars. The hubs of 10 stars 3 are installed with a gap in the conical holes of the sleeves 9. The latter are rigidly connected to the hub 10 by means of a housing 11 B and 7 circular lobes. The sleeves 9 are mounted on the frame with the possibility of displacement of the sprockets 3 along the axis of rotation. The frame rests on the base by means of shock absorbers. Under the upper branch C, a receptacle is installed. When the asterisk 3 rotates, C is longitudinally displaced, the circular oscillations of the asterisks 3 excite in C transverse wave oscillations with the rotational frequency B 7. The most intense oscillations C occur when the oscillation frequency B 7 coincides with one of the natural oscillation frequencies C. The incoming to the upper branch C the original M is vibrated during movement. The undersize product passes through the C and is output to the receiver. 1 3. Clause f-ly. 2 Il. S cl c

Description

(Reg. 2

SP

00

This invention relates to a technique for separating bulk materials by size and can be used in the coal, construction, oil and other industries.

The purpose of the invention is to simplify the con- struction and increase the efficiency of the separation of the material by size by using the rotation of the vibrator to override the grid and excite wave oscillations in it.

FIG. 1 shows the device, the view; in fig. 2 - drive mechanism.

The device for screening bulk materials consists of frame 1, grid 2, encompassing an infinite canvas of lead 3 and trailing 4 stars, receiver 5 (oddretny product, shock absorbers 6, through which frame 1 rests on the base Vibrator vibrator 7 circular oscillations, I drive 8.

The frame 1 is fixed coaxially to the sleeves 9, (the holes x with a gap in it are installed the hubs of 10 leading stars 3, rigidly interconnected by the body 11 of the vibrator 7. Driven sprockets 4 are installed 1 and in frame 1 in the traditional way - by bearing supports 12.

To adjust the gap, e, the openings of the sleeves 9 are made of co- and the bushes are mounted on

Ame 1 with the possibility of displacement along the axis

Asterisks 3.

The contacting surfaces of the sleeves of the 9 hubs 10 are rubber coated to increase their adhesion and soften the contact. The device works as follows.

The actuator 8 rotates an inertia vibrator 7, exciting circular movements 1, the mass centers of the driving sprockets 3 with the frequency of rotation of the drive shaft 8. As a result of oscillations generated, the hubs 10 sprockets 3 roll around the inner surface of the bushes 9. At the same time for one obfoto vibrator shaft 7 drive sprockets 3 turn the angle

2D (02-0 |)

 - 1) 7-

Where

(p - the angle of rotation of the leading stars 3, happy; l: 3.14;

B | and Da, respectively, the diameters of the hubs 10 and sleeves 9 along the contact line. Thus, the drive sprockets 3 perform circular oscillations in a vertical n intensity with a frequency of rotation of the vibrator 7 and rotate about their own axis with a circular frequency

(2)

r.tie 0) 3 and WB are the angular velocities of rotation of the asterisks 3 and the vibrator 7, respectively.

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As can be seen from formula (2), the angular velocity of rotation of the sprocket 3 can be changed by adjusting the size of the gap e at a constant speed of rotation of the vibrator 7. This gap can be changed by axial displacement of the sleeves 9 and then fixing them on the frame 1 by means of known techniques. If we take the gap size mm, the hub diameter of 10 drive sprockets 3 DI 300 mm, the angular velocity of rotation of the vibrator 7 and 100 rad. then the angular velocity of rotation of the asterisks in this case will be shz 3.33 rad. . With a sprocket diameter of 3500 mm, the speed of grid 2 will be 1.67 m., Which corresponds to the speed of the belt on belt conveyors.

As a result of the rotation of the leading sprockets 3 of the grid 2, the longitudinal movement is connected, and the circular oscillations of the stars of riders 3 excite in the grid 2 transverse wave vibrations with the frequency of rotation of the vibrator 7. The amplitude of oscillations of the grid 2 is determined by its elastic properties, length of idle and working sections and their tension by living.

The most intense oscillations occur when the oscillation frequency of the vibrator 7 coincides with one of the natural frequencies of the oscillation of the grid 2. By selecting the parameters of the grid 2 and the frequency of the forced oscillations in the grid 2, oscillations of the "one hundredth wave" type are excited.

The source material is fed to the upper branch of the grid 2. As a result of its movement, the material moves to the discharge end of the device. In the course of the movement, the material layer is subjected to vibrations of different intensity depending on its position on the grid 2. The undersize product passing through the grid enters the receiver 5 and is led to the side from under the grid.

Frame I, mounted on shock absorbers 6, oscillates in the vertical plane with a small 0 intensity (much less than the driving sprockets 3). However, these oscillations contribute to efficient removal from the grid through the receiver 5 of the undersize product.

Simplification of the design of the screening device is carried out by combining the functions of the vibrator, which excites oscillations of the grid and its longitudinal movement.

Improving the efficiency of screening Q is achieved due to a significant increase in the frequency of wave oscillations in comparison with the known devices.

In addition, the proposed device makes it possible to adjust the amplitude of oscillations of the grid and the speed of its proximate longitudinal movement, which makes it possible to determine the modes of grid movement that are optimal for the technological process.

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Claims (2)

1. A device for screening bulk materials, comprising a frame mounted on shock absorbers, a grid in the form of an endless web, encompassing driven and driving stars with hubs, a receiver of a sub-mesh product, located under the upper branch of the grid, a circular vibrator and an actuator, characterized in that in order to simplify the design and increase Neither is the efficiency of screening, the device is equipped with bushings fixed coaxially on the frame, in the holes of which the hubs of the drive sprockets rigidly connected with each other by the body of the vibrator are installed with a gap. 2. The device according to claim 1, characterized in that the openings of the sleeves are made conical, and the sleeves themselves are mounted on the frame with the possibility of displacement along the axis of rotation of the driving sprockets. X five ///// // /// 1