RU2234066C2 - Device for determination of unbalance of rotors in a static mode - Google Patents

Abstract

FIELD: mechanical engineering and means of determination of unbalance of rotors.

SUBSTANCE: the invention is dealt with the means of determination of unbalance of rotors. The device for determination of a unbalance of rotors in a static mode contains a stand, two fixed on it legs with the ball-bearings supports interacting with a horizontally mounted being balanced rotor with capability of periodical reciprocal-rotary motions of outer races of ball-bearings in respect to their internal races in the opposite directions for each support. At that a being balanced rotor interacts with the supports through intermediate links made in the form of a support shaft and flexible filaments. The outer races of the ball-bearing supports have a capability of movement due to fixed to them pendulums. The given invention is aimed to increase accuracy of a being determined value and a position of the unbalance of rotors in the static mode, and also at simplification of the whole design the device for determination of a unbalance of rotors.

EFFECT: the invention allows to increase accuracy of a being determined value and a position of the unbalance of rotors in the static mode and to simplify the device design.

2 dwg

Description

The invention relates to the field of engineering, and in particular to devices for determining the imbalance of rotors.

A device for static balancing in the centers on a fixed base / 1 /, consisting of a fixed base with horizontal rails, two racks installed in the rails with the ability to change the distance between them, in which are fixed hollow center with technological ball bearings.

The disadvantages of this device are the low accuracy of determining imbalance, balancing, narrow scope.

There is also known a device for the static balancing of gyros with axial vibration of technological ball bearings / 2 /, containing a base, two racks installed in horizontal guides of the base, technological ball bearings fixed in the nests of the racks with the possibility of axial vibrations. The source of vibration is an electromagnet that interacts with a yoke attached to one of the rack sockets.

The disadvantages of this device are the design complexity and limited use.

The closest technical solution to the invention is a device for static balancing nodes of gyroscopic devices on rotating technological ball bearings / 3 /, containing a frame, two racks mounted on it with ball bearings for horizontal installation of balanced rotors. The outer rings of the ball bearings of the bearings make periodic reverse-rotational movements relative to their inner rings to the opposite sides for each support by means of an electric motor through a hinge mechanism.

The disadvantages of this device are the design complexity due to the presence of an electric drive, insufficient accuracy of determining the imbalance and therefore balancing, limited application.

The objective of the proposed technical solution is to increase the accuracy of determining the magnitude and position of the imbalance of the rotors in static mode and simplify the design of the device.

This is achieved by the fact that the balanced rotor interacts with the supports through intermediate links in the form of a support shaft and flexible threads, and the outer rings of the ball bearings of the bearings are driven by pendulums.

The invention is illustrated by drawings. Figure 1 shows a General diagram of the device, and figure 2 is a side view.

The device for determining the imbalance of the rotors consists of a frame 1, a horizontally located support shaft 2 with pulleys 3 and 4 rigidly fixed thereon. Ball bearings 5 of the support shaft are mounted in bushings 6, which are supported through bearings 7 on the device bed. Weights are attached to the bushings 6 on rigid rods, forming pendulums 8. The balanced rotor 9 is suspended from the support shaft 2 horizontally on two flexible threads 10 thrown over the pulleys 3 and the axle of the rotor with the possibility of its free rotation around its axis. The counterweight 11 is suspended from the support shaft 2 also on a flexible thread 10 wound on a pulley 4.

The device operates as follows. The balanced rotor 9 is suspended on flexible threads 10 in a position where its center of mass C does not lie in a vertical plane passing through the axis of rotation of the rotor. In this case, the moment of gravity of the rotor G relative to this axis arises, which will rotate the rotor, bringing it to the position of static equilibrium. This torque is transmitted through the flexible threads 10 to the support shaft 2, increasing in proportion to the ratio of the diameters of the pulleys 3 and the pins of the rotor 9 D / d, which makes it possible to more effectively overcome the resistance of the ball bearings 5 of the support shaft, and, therefore, to more accurately determine the position of the imbalance of the rotor.

By varying the mass of the counterweight load 11, suspended from the flexible thread 10 wound on the pulley 4, achieve a state of equilibrium of the device at any position of the rotor, thus determining the amount of imbalance of the rotor.

Continuous reverse-rotational movements of the outer rings of the thrust ball bearings 5 in opposite directions, in order to reduce friction in them, and therefore increase the accuracy of the device, are carried out by periodic damping oscillations of two pendulums 8 together with bushings 6, driven manually.

Sources of information

1. A device for static balancing in the centers on a fixed base. Kovalev M.P., Morzhakov S.P., Terekhova K.S. Dynamic and static balancing of gyroscopic devices. - M.: Mechanical Engineering, 1965, pp. 276-278.

2. Installation for static balancing of gyros with axial vibration of technological ball bearings (author Z. Urazaev). Kovalev M.P., Morzhakov S.P., Terekhova K.S. Dynamic and static balancing of gyroscopic devices. - M.: Mechanical Engineering, 1965, pp. 279-280.

3. A device for static balancing of the nodes of gyroscopic devices on rotating technological ball bearings. Kovalev M.P., Morzhakov S.P., Terekhova K.S. Dynamic and static balancing of gyroscopic devices. - M.: Mechanical Engineering, 1965, pp. 280-281 - prototype.

Claims (1)

A device for determining the imbalance of rotors in static mode, containing a bed, two racks mounted on it with ball bearings, interacting with a horizontally mounted balanced rotor, with the possibility of periodic reciprocating movements of the outer rings of the ball bearings relative to their inner rings in the opposite sides for each bearing, different the fact that the balanced rotor interacts with the supports through intermediate links in the form of a support shaft and flexible threads, and the outer e ring of ball bearing supports have the possibility of making movements attached thereto by pendulums.

Images