RU185975U1 - CENTRIFUGAL VIBRATORY EXCITER WITH ADJUSTABLE STATIC DETAIL OF MASS OF DEBALANCE - Google Patents

Abstract

The utility model relates to vibration technology and can be used in various industries where vibration devices with severe operating conditions are required.

The technical result is aimed at maintaining the constancy of the given vibration velocity of the resonant vibrations of the working body of the vibrating machine, excited by a centrifugal vibration exciter, when the mass of the process load changes due to the use of self-regulating (passive) unbalance.

The essence of the utility model lies in the fact that the centrifugal vibration exciter unbalance is made in the form of a rectangular or cylindrical beam, while there is a radial cavity from one end of the beam, inside of which there is a weight, screwed by a spring to the center of rotation, and a screw plug, and the weight can move along a line passing through the center of mass of the unbalance and the axis of rotation. Thus, its displacement relative to the axis of rotation changes depending on the speed of unbalance rotation, the stiffness of the spring and the degree of preloaded spring. With increasing / decreasing speed, rotation, the total eccentricity of the unbalance decreases / increases, due to which the vibration velocity of the resonant vibrations of the working body of the vibrating machine is constant when the mass of the process load changes. 2 ill.

Description

The utility model relates to vibration technology and can be used in various industries where vibration devices with severe operating conditions are required.

The technical result is aimed at maintaining the constancy of the given amplitude of the resonant vibrations of the working body of the vibrating machine, excited by a centrifugal vibration exciter when the mass of the technological load changes due to the use of self-regulating (passive) unbalance.

Known unbalanced vibration exciter containing an electric motor, a drive shaft with two unbalances installed on it, one of which is fixed to the shaft motionless, and the other is mounted with the possibility of rotation by means of a copier and a spring tightening them (A.S. USSR No. 784945, class B06V 1 / 16, 1980). The disadvantages of this vibration exciter are also the design complexity and low reliability due to the lack of cooling, as well as an unsatisfactory linear law of variation of the spreading force from speed, which makes it difficult for the vibration exciter to pass through the resonance zone.

Known vibration exciters presented in [1, 2]. They have a simple design, ease of manufacture and use, but there are disadvantages, such as: there is no way to automatically maintain the amplitude of the vibrations of the mechanical system during the operation of the vibrating machine, there is no way to automatically maintain the vibration speed of the vibrations of the vibrating machine. Some of them have the ability to automatically control, increasing the static moment as acceleration [1, p. 214, Fig. 109e)], however, in order to maintain the constant vibration velocity of the working body of the vibrating machine, an inverse relationship is required: the change in the static moment from maximum to minimum as the acceleration accelerates.

To achieve a technical result, a centrifugal vibration exciter with an adjustable static moment of unbalance mass is proposed, containing a drive motor, the unbalance of which is made in the form of a massive steel rectangular or round beam and symmetrically mounted on the axis of the motor shaft, with a radial cavity from one end of the beam , in which a weight is located, drawn towards the center by means of a spring and a screw plug, with the possibility of moving it along the cavity I fixed position from the center of rotation of the unbalanced mass, which is determined depending on processing load unbalance according to the formula: L = kP,

where L is the distance from the center of rotation to the end face of the plug, mm;

k is the unbalance coefficient;

P - the technological load of unbalance, kg

The invention is illustrated by drawings, which depict:

in FIG. 1 - centrifugal vibration exciter,

FIG. 2 - centrifugal vibration exciter, type AA.

The centrifugal vibration exciter contains a drive motor 1, on the shaft 2 of which an unbalance 3 is rigidly fixed in the form of a rectangular or round beam, while there is a radial cavity 4 from one end of the beam, in which a weight 5 is located, pressed against the center of rotation by a spring 6 and a screw plug 7.

In the initial position with a non-rotating drive shaft, the weight 5 is spring loaded 6 to the axis of rotation of the shaft 2. During acceleration, the weight is shifted by a certain distance from the axis of rotation and, thereby, the total eccentricity of the unbalance is reduced. At the resonant frequency of oscillations of the working body of the vibrator, the position of the weight relative to the axis of rotation of the unbalance will determine the amplitude of the oscillations of the working body. With a change in the resonant frequency of oscillations of the vibrator, caused by a change in the mass of the process load, the unbalance rotation frequency changes, as a result of which the position of the weight and, accordingly, the disturbing force change so that the vibration velocity of the resonance oscillations remains unchanged.

The stiffness of the spring should provide such a shift of the weight, in which the disturbing unbalance force changes so that the vibration velocity of the resonant vibrations remains unchanged when the mass of the process load changes.

Thus, the proposed utility model - a centrifugal vibration exciter, in comparison with the prototype, has the function of maintaining a constant vibration velocity of the vibrations of the working body of the vibrating machine when the mass of the process load changes, which, in turn, ensures maximum productivity of the process.

Bibliography:

1. Vibration in technology: a reference. In 6 t. T. 4. Vibration processes and machines / under. ed. E.E. Lavendela. - M.: Mechanical Engineering, 1981. - 509 p., Pp. 460-467.

2. Bykhovsky II. Fundamentals of the theory of vibration technology. - M.: Mechanical Engineering, - 1968. - 361 p.

Claims (4)

A centrifugal vibration exciter with an adjustable static moment of unbalance mass, containing a drive motor, on the shaft of which an unbalance is fixed, characterized in that the unbalance is made in the form of a massive steel rectangular or round beam symmetrically fixed to the axis of the motor shaft, while there is a radial cavity from one end of the beam, in which a weight is located, drawn towards the center, by means of a spring and a screw plug with the possibility of moving it along the cavity and adjusting I from the center of rotation of the unbalanced mass, which is determined depending on processing load unbalance according to the formula: L = kP, where L is the distance from the center of rotation to the end face of the plug, mm; k is the unbalance coefficient; P - technological unbalance load, kg

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