SU726453A1 - Method of dynamic balancing of elastically-suspended working members of machines - Google Patents

Description

The invention relates to a technique for balancing bodies and, in particular, to dynamic balancing of machines with rotating working bodies that have an elastic suspension, for example, rotors of centrifuges and washing and squeezing machines. It is known methods of dynamic balancing of bodies of rotation that are produced on special machines or devices equipped with oscillating frame or oscillating support l}. To install the body of rotation on such machines, it must have at least two base surfaces. The selection of masses of balancing weights and radius vectors of their installation site is carried out according to the method of B. V. Shitikova A, A. Savelova, and others. However, the known methods of balancing are complex. The purpose of the invention is to simplify the dynamic balancing of rotating working bodies of machines, for example, single-support laundry centrifuges. The goal is achieved by using the phenomenon of jamming - not leaving the working mode of a rotating working body due to the lack of energy supplied by it to overcome the vibration moment when passing through resonance. In this case, the installation location and the value of the corrective counterweight are determined by selecting unbalance plates attached at various points around the circumference of the balancing tool to determine the maximum and minimum debalance values in diametrically opposing points. Figs 1 and 2 illustrate examples of possible schemes for the working bodies of single-support centrifuges. The working body of a centrifuge consists of a drive shaft 1 and a drum consisting of a shell 2 and a bottom 3, and has

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one or two elastic suspensions (points

0 and O2).

The balancing is carried out as follows.

For example, on the circumference of the junction of the shell 2 and the bottom 3, a point test load 4 is assembled from unbalanced tsagotii with a minimum mass, which ensures steady-state oscillations of the working body in the resonance zone during acceleration. Then the test load is moved around the selected circle and again the smallest weight of the test load is determined in the same centrifuge operating mode. For two diametrically opposed points on the selected circle, the minimum maximum (t) masses of p {/ bulk loads is recorded. The corrective counterweight 5 is calculated using these values.

If the counterweight is supposed to be put at the point where it is found or removed

max then its value is metal at point t,

mm is equal to

.

(one)

If the counterweight 4 is supposed to be set or removed at another point of the plane passing through the diametrically opposite points and the axis of rotation of the working element, then its value (t) is calculated from the condition of equality of the centrifugal moments of inertia of the unbalances I1 and m

mex

m

(2)

and li.

-the distance from the center of the elastic suspension to the plane of the weights W and m, respectively;

, e.

-radius vectors of cargo HZ, respectively.

After installing or removing the balancing weight, the rotor is dynamically balanced.

Claims (2)

1. USSR author's certificate number 62304, cl. Gr 01 M 1/04, 1941. 2. The basics of balancing technology. Volume 1, M., Mechanical Engineering, 1975, p. 180-1 & 4.