SU1586791A2 - Screen - Google Patents

Abstract

This invention relates to the separation of materials by size and can be used in the mining and other industries. The purpose of the invention is to increase the efficiency of screening and dynamic balance of the screen. The screen contains box 1 with sieves 2 and vibration exciter 3. Box 1 rests on racks / C / 5 with hinges / W / 6 and 7 and on shock absorbers 4. Top hinges 7 racks 5 are interconnected by an @ -shaped beam 9. Between boxes 4 and @ -shaped beam 9 are located springs / П / 10. At the same time П 10 have a transverse axis coinciding with the axis Ш 7,8 and installed at an acute angle, which can be changed, to the longitudinal axis C 5. When the vibration exciter 3 rotates the box 1 performs oscillations non-uniform along the length. When installing P 10 at an acute angle, box 1 begins to make a complex movement. The relative amplitude is transmitted by the P 10 to the racks 5 with a force that sets them in motion. 3 il.

Description

The invention relates to devices for the separation of materials by size, can be used in the mining, metallurgical and other industries of the industry and is an improvement of the invention according to the author. Ev, No. 1119740.

The purpose of the invention is to increase the efficiency of screening and dynamic balance of the screen.

FIG. 1 shows the device, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - kinematic device diagram with spring installation at an acute angle.

The screen consists of a box 1 with sieves 2 and vibro-excitator 3, which rests in the discharge part on the shock absorbers - coil springs 4, and in the loading part on the racks 5 with hinges 6 and 7. The lower hinges 6 of the racks 5 rest on the frame 8. The upper hinges 7 The posts 5 are interconnected by a 1 - L-shaped beam 9. The beam provides for the passage of the transverse axis of the upper hinges 7, which coincides with the position of the center of impact of the box, through the transverse axis of the springs 10 mounted on the beam 9. The springs 10 are installed with rotatable around the transverse axis ak that their longitudinal axis is an acute angle with the longitudinal axis 5. The struts unbalance exciters shaft 3 can be mounted both along and transverse to the longitudinal axis of inertia of the box 1,

An inertial vibration exciter is located on the central axis of inertia of the duct in the center of impact, and the axes of the struts are perpendicular to the central axis of inertia of the duct and are located from the axis of the vibratory exciter oscillation

one

K 1c m g

where io is the moment of inertia of the box relative to the rack;

m is the box mass;

g is the distance from the stand to the center of the body of the duct;

K - coefficient taking into account the mass of the material moving through the sieve (, 951, 1).

The roar works as follows.

When the unbalance shaft rotates, the vibration exciter 3 box 1 oscillates non-uniformly along the length of the box so that in the area of the point of attachment of the springs 10 in the general case there are normal and tangential components of the amplitude oscillations. If the pillars 5 are fastened to the duct as in the prototype, then the duct points in the area of attachment of the hinges 7 are made moving.

due to the fact that the amplitude component of the AP as a force is transmitted through the stands to the foundation

Fn ApSa,

where Ca is the stiffness of the hinges, N / m;

An - normal amplitude component, m.

When installing the springs 10 under the sharp

the corner of the box begins to make difficult

0 movement. At point A (Fig. 3) is relative

the amplitude A is transmitted by the spring to

rack 5 in the form of a force equal to

F SpAotn sin, where Cn is the spring stiffness, N / m; 5 Aоn-relative amplitude of the box, m; p is the angle between the direction of Аон and the central axis of inertia of the box OOi;

“- an angle between the axles of the springs 10 and the struts 5.

0This force drives rack 5,

which, in turn, report a portable motion to point A. According to the rule of summation of displacements in a complex motion, the resulting tangential amplitude will be determined as the sum

AG Ag-lAgs,

where AG is a relative tangential component of the amplitude of the tray at point A;

Arc-portable amplitude due to swinging the rack.

A change in the angle of inclination of the spring to the axis of the lever leads to a change in the magnitude of the tangent component of the amplitude; as this angle increases, the tangential component of the amplitude increases. As for the normal component of the amplitude at point A, it remains equal to

0 An, i.e. the normal component of the relative amplitude, since the portable movement — swing of the struts 5 — does not give an increase in the amplitude along the normal. That part of the normal component of the amplitude An, which

5 is transmitted to racks 5 in the form of a force and from the racks to the frame, while being equal to

s - d sp sa

gp - APS

Un-t-Sa

And it constitutes dynamic loads transferred to the foundation. Since the value

  WITH

. Г I, f is less than Cn and less than Sa, then norL-n Г La

the marginal component of the AFS force transferred to the foundation is reduced, than 5 a positive effect is achieved due to an increase in the dynamic balance of the system,

Claims (1)

Formula of Invention St. Ns 1119740, characterized in that, in order to increase screening efficiency and dynamic 515867916 balance screen, it is equipped with a transverse axis of the springs coincides with the axis  -shaped beam linking the hinges, and the springs are installed by the sub-side lateral parts of the upper hinge angle to the longitudinal axis of the struts with possible racks, and the springs, by means of which they rotate around their transverse The box is supported on the beam, with 5 axles.  l Fi.Z