CN2514935Y - Equipment for producing multi vibration type screen using biexciting motor - Google Patents

Abstract

The utility model relates to a device using two exciting electric machines with the same characteristic. The two exciting electric machines are symmetrically arranged on crossbeams 2 with a definite tilting angle (throwing angle) at both sides of a screening box 1 of a vibrating screen. The connecting wire of the exciting centers of the two exciting electric machines 3 is coincided with the centroid of the screening box. When the longitudinal axial lines of the exciting electric machine 3 on both sides and the central line of the horizontal plane of the screening box 1 form an angle alpha, the moving path of the screening box is elliptic; when the alpha is 0 DEG, the moving path of the screening box is in a straight line; when the alpha is 90 DEG, the moving path of the screening box is circular. The utility model has the advantage that when the screening medium changes, under the condition of not changing the vibrating screen, different vibrating types and the exciting force sizes can be selected at any time to obtain the best screening effect so as to extend the service life of the sieve, enlarge the handling capacity, save energy and reduce cost.

Description

Use the device that two shock electric machines produce many vibration shape vibratory sieve

The utility model relates to a kind of device that two shock electric machines produce many vibration shape vibratory sieve of using.Many vibration shape vibratory sieve is specially adapted in the course of the work, after sieving media changes, requires to use the vibratory sieve of the corresponding vibration shape, to use under the condition of raising the efficiency

Ore dressing of the prior art, the machine manufacturing, the various vibratory sieves of food industry and oil drilling industry can be divided into the garden type, three kinds on linear pattern and balanced ellipse garden type according to the movement locus of screen box.In the prior art, all by single vibration shape design vibratory sieve.The garden vibration shape vibratory sieve that advanced in the world Braoid company produces, the Derrick company of the U.S. produces straight line shaker, and the IBAG of Germany, the Hengshan Mountain industrial group of Japan, the ellipse garden of Kawasaki Heavy Industries production smoothing sieve.

The vibratory sieve of three kinds of vibration shapes all has own specific best sieving media.For example, the mud vibrating screen in the oil drilling industry in drilling process, pass different rock stratum, and the screening effect of the landwaste of different rock-layers has direct relation with the vibratory sieve of the different vibration shapes.Garden vibration shape vibratory sieve is particularly suitable for sieving the rich clay layer, and straight line shaker is specially adapted to harder gravel rock stratum, and balanced ellipse garden sieve is specially adapted to sieve those and is easy to stop up screen cloth, and the rock stratum that treating capacity is descended.

In the prior art, the two shock electric machines of still unresolved application can be finished the conversion of the different vibration shapes through simple adjustment on same vibratory sieve.The purpose of this utility model is that a kind of two shock electric machine devices that can produce three kinds of different vibration shapes on same vibratory sieve will be provided.Require to adjust by simple, can effectively select the garden vibration shape respectively according to the character of screening material, the vibratory sieve of the straight line vibration shape or the ellipse garden vibration shape carries out work.And can regulate the size of exciting force and the ratio of oval length semiaxis.

Fig. 1 is the installation site schematic diagrames of two shock electric machines on screen box.Among Fig. 1, the 1st, shock electric machine; The 2nd, the center line of shock electric machine; The 3rd, the screen box of vibratory sieve; The 4th, the axis of the horizontal direction of screen box; The 5th, the support spring of screen box; The β angle is make a concerted effort angles (being projection angles) with horizontal direction of two shock electric machine excitings; The α angle is the angle between the center line of two shock electric machine longitudinal axis and screen box horizontal level.

Fig. 2 is a mathematics mechanical model of using the vibratory sieve screen box center of mass motion track of two shock electric machines.O is the centroid position of screen box among the figure.According to this model,, can derive the movement locus equation group of screen box barycenter according to self synchronization theory and kinematic principle:

x＝ASinωt (1)

y＝BCosωt (2)

θ=Ω Sin ω t (3) is wherein:

A＝2meSinα/[(ω _x0/ω) ²-1] (4)

B＝2me/[(ω _y0/ω) ²-1] (5) $\mathrm{\Ω}=\mathrm{SmeSin\α}/[{({\mathrm{\ω}}_{{\mathrm{\θ}}_0}/\mathrm{\ω})}^2-1]--\left(6\right)$ In the formula:

A, B, Ω are respectively the maximum transversal of screen box barycenter, pitch amplitude and pitch angle;

The exciting piece eccentric mass square of me--shock electric machine;

The lateral displacement of x--screen box barycenter;

The length travel of y--screen box barycenter;

θ--screen box is around the angular displacement of barycenter;

The M--mass of vibration;

The J--mass of vibration is around the rotary inertia of barycenter;

L ₁, L ₂--barycenter is to the distance of support spring, L ₁=L ₂

ω--shock electric machine angular speed;

The S--two shock electric machine lines of centres are to the distance of screen box barycenter;

ω _X0, ω _Y0, Be respectively that screen box is horizontal to shake, the intrinsic frequency of longitudinal vibration and torsional oscillation is respectively:

ω _x0＝[2K _x/M] ^-0.5 (7)

ω _y0＝[2K _y/M] ^-0.5 (8) ${\mathrm{\ω}}_{{\mathrm{\θ}}_0}=L[2K_y/J{]}^{-0.5}--\left(9\right)$

K _x, K _yIt is the vertical and lateral stiffness of screen box support spring.

According to the mathematics mechanics conclusion of above-mentioned derivation, the purpose of this utility model is achieved in that

The utility model is by two equal-wattages, and rotating speed, exciting force and the shock electric machine of doing reverse rotation are installed in the screen box both sides symmetrically by on the crossbeam at β inclination angle and form.Regulate eccentric block position on the shock electric machine, can obtain different exciting forces.

The utility model strictness designs by the requirement that the line and the screen box barycenter at two shock electric machine centers coincides.Therefore in the formula (6)

S＝0

So

θ＝0

So the screen box that centers on the barycenter front and back has not had faces upward the motion of bowing, the screen box each point has the movement locus of identical equilibrium.1. realize the balanced ellipse garden of screen box movement locus

The movement locus of screen box obtains elliptic equation by formula (1) and formula (2) summed square

(x/A) ²+(y/B) ²＝1 (10)

Thereby realized elliptical trajectory.Generally, intrinsic frequency one ω _X0, ω _Y0,

Much smaller than excited frequency, can be similar to and think ω _X0=ω _Y0So, have

A＝BSinα (11)

Therefore, the utility model can be adjusted the ratio of the major and minor axis of elliptical trajectory by the size at the α angle of adjustment two shock electric machines.2. realize screen box linear pattern movement locus

Shock electric machine in the utility model is adjusted to the position of α=0 °, and promptly the axis of two shock electric machines is parallel to screen box horizontal plane center line, learns Sin α=0 by formula (11), thus A=0, so linear equation

x＝0

y＝BCosωt (12)

Thereby realized the screen box straight-line trajectory.3. realize screen box garden shape movement locus

Learn by formula (4) and (5), as long as

ω _x0＝ω _y0

For this reason, select rigidity (K such as two-way for use _x=K _y) spring also can achieve the goal.Learn by formula (11),, be about to two shock electric machines and be arranged on the same axis that A=B is then arranged, obtain the screen box garden equation of motion by (10) formula when α=90 °

x ²+y ²＝1 (13)

Thereby realized screen box garden movement locus.

Structure of the present utility model is provided by following example and accompanying drawing.

Fig. 3 is the structural representation of the vibratory sieve of the balanced elliptical trajectory that provides according to the utility model.Among the figure, the 1st, the screen box of vibratory sieve; The 2nd, the crossbeam of the screen box both sides of shock electric machine is installed; The 3rd, shock electric machine; The 4th, support spring.At this moment, 0 °＜α＜90 °.

Fig. 4 is the structural representation according to the vibratory sieve of the straight-line trajectory that the utility model proposes.Among the figure, the 1st, screen box; The 2nd, the crossbeam of the screen box both sides of supporting shock electric machine; The 3rd, shock electric machine; The 4th, support spring.With the unique difference of Fig. 3 only be that longitudinal axis with two shock electric machines is rotated into the state that is parallel to each other in the original place, i.e. α=0 ° is to realize the garden movement locus of screen box.

Fig. 5 is the structural representation according to the vibratory sieve of the garden movement locus that the utility model proposes.Among the figure, the 1st, screen box; The 2nd, the crossbeam of the screen box both sides of supporting shock electric machine; The 3rd, shock electric machine; The 4th, support spring.With the unique difference of Fig. 3 only be that longitudinal axis with two shock electric machines is rotated into the straight line state in the original place, i.e. α=90 ° are to realize the garden movement locus of screen box.

The utility model is compared with existing vibratory sieve technology, has the following advantages:

1. can under the situation of not changing vibratory sieve, select the size of the different vibration shapes and exciting force at any time according to the character of screening material, obtaining best screening effect, prolong screen cloth service life, increase disposal ability, save the energy, reduce cost;

Effective simplification the structure of vibratory sieve.Because the utility model requires the screen box barycenter to overlap with the line at two shock electric machine centers, therefore, need only shock electric machine is done counterrotating adjustment in position, just can obtain the different vibration shape, the while can be adjusted the size of exciting force, the ratio of ellipse garden major and minor axis.

Claims (4)

1. an energy is on same vibratory sieve, realize that the screen box movement locus is respectively balanced ellipse garden, the device of three kinds of vibration shapes of straight line and garden, it is characterized in that: use two power, rotating speed, exciting force size, the shock electric machine 3 that weight is identical, being arranged in the screen box both sides symmetrically has on the crossbeam 2 at certain inclination angle, and the exciting line of centres of two shock electric machines and the barycenter of screen box coincide; Two groups of screen box support spring symmetries are installed on the barycenter both sides.

2. according to right 1 described device, when the longitudinal axis that it is characterized in that two shock electric machines becomes the α angle with screen box horizontal plane center line (0 °＜α＜90 °), the screen box movement locus is the balanced ellipse garden vibration shape.

3. according to right 1 described device, when it is characterized in that the longitudinal axis of two shock electric machines and screen box horizontal plane center line are parallel to each other (α=0 °), the screen box movement locus is the straight line vibration shape.

4. according to right 1 described device, when it is characterized in that the longitudinal axis of two shock electric machines is vertical mutually with screen box horizontal plane center line (α=90 °), the screen box movement locus is the garden vibration shape.

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