SU1643116A1 - Vibrating screen - Google Patents

Description

one

(21) 4636526/03 (22) 01.12.89 (46) 04.23.91. Bul Number 15

(71) Production Association Uralmash and Ural Polytechnic Institute. S.M.Kirov

(72) A.N. Kosolapoy, I.I.Blekhman, G.V. Dakalov, V.A. Oleneva and V.I. Gladkikh (53) 621.928.2 (088.8)

(56) USSR Author's Certificate No. 112448. class. B 07 B 1/40, 1957.

Copyright certificate of the USSR № 940868, cl. B 07 B 1/40, 1980. (54) VIBRATING ROUND

(57) The invention relates to the sieving of bulk materials and can be used in the metallurgical, mining and other industries of the industry. The goal is to increase the efficiency and productivity of screening by providing optimal vibration parameters along the length of the duct (K) 1 of the screen when the technological load on the screen changes. At the same time, K 1 with a sieve 2 is installed on vibration isolators 3. On K 1, two unbalanced self-synchronizing vibration drivers (VF) 4 are installed to move around it. by virtue of

the adaptive property of self-synchronizing propellant 4 is established so relative to the phasing of their rotation, in which the resultant driving force passes almost through the center of mass (CM) of the oscillating parts of the rumble. When the CM changes due to uneven distribution of the material along the K 1 length and changes in the technological load on the screen, the rotational phasing of the explosive 4 changes and the line of action of the resultant driving force of the explosive 4 changes with the CM. The adaptive property is more effectively manifested in the following relationships: sin 2dfltr 2b 7 / K;

cos2 "Ha2 + b2- / 2): K; K (2b) 2+ (a2 / 4 + b2-2). where the angle of skewing BB 4; a — center distance of explosive 4;

xcos2 "crb2 + 1/2; b is the distance from the CM to the plane passing through the axis of rotation B 4; I / is the distance from the CM to the plane, which divides the center distance of the explosive 4 in half and perpendicular to the plane passing through the axis of rotation of the explosive 4. By moving explosive 4 through K1 you can change their relative phasing and thus select the optimum angles of vibration K1 . 4 il.

B o)

Figz

The invention relates to devices for sifting bulk materials and can be applied in the metallurgical, mining and other industries.

The purpose of the invention is to increase the efficiency and productivity of screening by providing optimal vibration parameters along the length of the duct with variations in the technological load on the screen.

FIG. 1 shows a schematic crash, general view; in fig. 2 is a view A of FIG. one; in fig. 3 - a variant of the screen; in fig. 4 is a view B in FIG. 3

The vibrating screen consists of a box 1 with a screen 2 installed on vibration isolating torus 3 and a vibration drive.

The vibrodrive consists of two unbalanced vibratory exciters, each with two unbalanced shafts 5 each, and the unbalanced shafts 5 located on the same axis OL are not kinematically connected with unbalanced shafts located on the other axis O2. The rotation of the shafts 5 is imparted from two electrically uncoupled engines 6.

The motors are equipped with speed control devices 7, for example, thyristor control stations, and devices 8 for changing the direction of rotation of the motors, for example, reversing starters. Vibro-exciters 4 are provided with braking devices 9, and their axes of rotation are parallel to each other and perpendicular to the longitudinal plane of symmetry of the duct. Vibro-exciters 4 are mounted on box 1 with the possibility of moving through it, and in each of the positions they are set at a distance determined from the ratio

 VK cos 2 oo-b2 4-2 where 2a is the angle of dephasing of vibration exciters, equal to arcsln - -2;

a is the center distance of vibration exciters;

b is the distance from the center of mass of the oscillating parts of the screen to the plane passing through the axes of rotation of the vibration exciters;

Tf is the distance from the center of mass from the oscillating parts of the screen to the plane that divides the center distance of the vibration exciter in half and perpendicular to the plane passing through the axes of rotation of the vibration exciter.

(2b-tf + (J4- + b2-ft2

Vibrating screen operates as follows.

When the motors 6 are turned on, the vibration exciters 4 are rotated in opposite directions. Due to the self-synchronization effect, the exciters rotate synchronously with the phase shift, which depends on the positioning of the axes of rotation Oi and O2 relative to

center of mass with oscillating screen parts. The resulting phase shift corresponds to a certain position of the line of action of the resultant driving forces generated by vibration exciters.

4, which sets the angle of vibration / 3. Depending on the physical properties of the material, the optimum angle of vibration is established due to the new arrangement of the axes of rotation Oi and O2. In this case, the adaptive property of self-synchronizing vibration exciters is used, which is as follows: when the position of the axes of rotation of the vibration exciters is changed relative to the center of mass of the oscillating parts

the vibration moment, which provides self-synchronization of the vibration exciters, causes such a change in the relative phasing of the vibration exciters, in which the resultant driving force again passes through practically this center of mass, i.e. the resultant follows the position of the center of mass.

The adaptive property is more effectively manifested at the indicated ratios and

provides a uniform vibration field along the entire length of the sieve 2 when the position of the center of mass changes due to the uneven distribution of the material along the length of the box 1 and changes in the technological load on the screen.

Claims (1)

Claims of the invention A vibrating screen comprising a screen with a sieve mounted on vibration insulators, two unbalanced self-synchronizing vibration drivers whose axes of rotation are parallel to one another and perpendicular to the longitudinal symmetry plane of the box mounted on the box with the possibility of moving him, characterized in that, in order to increase the efficiency and productivity of screening by providing optimal vibration parameters along the length of the duct with technological changes loads on the screen, vibration exciters are set relative to each other at a distance determined from the relation: e VK-co ao-b + j / 2 where 2 (Ho - the angle of dephasing of exciters, equal to arcsln 2b TI is the distance from the center of mass of the oscillating parts of the screen to the plane that divides the center distance of the vibration exciters in half and perpendicular to the plane - center distance of the vibration exciters; 5, passing through the axes of rotation b - distance from the center of mass, vibration vibration exciters, flying parts of the screen to the plane the vibration passing through the axes of rotation of the vibro- (ob + r- 4-b2 - wake: AND one Vida TI is the distance from the center of mass of the oscillating parts of the screen to the plane that divides the center distance of the vibration exciter in half and perpendicular to the plane passing through the axes of rotation & “- cf / l - pt five Vw.f . l ± FIG. C