SU1747190A1 - Vibration exciter - Google Patents

Abstract

The invention relates to a vibration technique and can be used to create vibrations. The purpose of the invention is to increase reliability by eliminating spontaneous axial movement. The vibration exciter consists of two coaxially mounted on the drive shaft and the cutting-off unbalances. They are made in the form of cylindrical glasses with unbalanced eccentric masses and are fixed one rigidly and the other rotatably and axially displaced. The fixation of the rolling unbalance is achieved by means of a ball with a diameter larger than the gap between the unbalances placed in the groove provided in the shoulder of one of the annular grooves placed oppositely on the adjacent ends of the unbalances. 4 il. h

Description

The invention relates to unbalanced vibration exciters and can be used, for example, in devices designed to relieve residual stresses by a vibration method.

The purpose of the invention is to increase reliability by eliminating spontaneous axial movement.

FIG. 1 shows a vibration exciter, a general view. lengthwise cut; in fig. 2 — node I in FIG. 1 (the working position of the ball in the groove); in fig. 3 is a section A-A in FIG. 2; in fig. 4 is a view B in FIG. 1 (scale and label).

The vibration exciter consists of unbalances installed on the drive shaft 1, made in the form of glasses 2 and 3. equipped with unbalance masses 4 and 5, respectively. Shaft 1 is mounted on supports 6 and 7 having common base and connected to electric motor 8. Glass 2 is fixed on shaft 1 by retainer 9 and is simultaneously a housing of an exciter, in which a second unbalance 3 enters coaxially and can be rotated and axially moved on shaft 1 For fixing the mutual position of unbalances 4 and 5, glasses 2 and 3 are interconnected with each other, for example, fine-grained toothed cuts 10 and 11, made on the inner projecting surface of unbalance 2 and peripheral surface of unbalance 3. Axial eremeschenie unbalance 3 is limited on the one hand a shoulder 12 of the shaft 1, and the other - the end face 2. unbalance forming with the end of the unbalance technological gap 3 a. Its size exceeds the width of the cutting 11, i.e. the cutting protrusion 11 can get out of the engagement with the cutting 10 of the unbalance 2.

The unbalance fixation mechanism 3 at the required positions is arranged as follows. By matching ends of unbalances

2

VI

k

yoo o

2 and 3 are opposedly formed annular grooves 13 and 14 of the same size, the total depth of which exceeds the diameter of the ball 15 placed in these grooves and thus receiving the possibility of free movement in the annular channel formed. At the same time, the diameter of the ball is 15. for example, 20–30% greater than the gap and between the unbalances 2 and 3. which does not allow it to fall out of the annular channel formed by the grooves 13 and 14.

On the shoulder of a larger diameter of the groove 10, in the unbalance 2, a groove 16 is made, which is a rectangular bevel with a length of 1.7-2.3 times the diameter of the ball 15 and a bevel angle of 20-30 ° to the plane of rotation, which allows the effect of self-retardation of the ball 15 and fixing the unbalance in this way 3. For ease of maintenance, the outer cylindrical surfaces of the unbalances 2 and 3 are marked with marks 17, scale 18, graduated as a percentage of the maximum disturbing force, the outer end of the unbalance

3 has a flange protrusion 19. In this case, the mark 17 also indicates the location of the groove 16 (below the mark 17).

Vibro works as follows.

When the engine 8 is turned on, the drive shaft 1 rotates unbalance 2 and unbalance 3 which is in engagement with its rifle 11. At the same time, axial displacement of unbalance 3 is prevented by ball 15, under the action of centrifugal forces held in a groove 16 and in a braking state. The rotating unbalances 2 and 3 transmit the disturbing force through the supports 6 "7 to the base.

When it is necessary to change the disturbing effort, the exciter is stopped and turned with the mark 17 upwards. When this groove 16 is in the upper position, the ball 15 falls out of the groove 16, rolling down the channel

formed by grooves 13 and 14, downward, under the axis of rotation, and unbalance 3 gets the possibility of axial movement. For the protrusion 19 debalzns 3 shift inward until the debalance 2 until it stops at its end. In this case, the cutting 11 gets out of engagement with the cutting 10 and enters the gap a (the ball 15 is in the channel formed by the grooves 13 and 14) and the imbalance 3 is able to

rotation Turning it, control the turn on a scale of 18 and establish the required disturbing force. The reverse axial displacement of the unbalance 3 is introduced into the engagement of the cutting 11 and 10, fixing the mutual position of the unbalance 2 and 3. When the drive 8 is turned on, the unbalance 2 and 3 begin to rotate, the ball 15 under the action of self-weight rolls over the ring channel and falls into the groove 16, where held by centrifugal force and is in a self-braking state, fixing the unbalance 3 from axial displacement. The rotating unbalances 2 and 3 transmit the disturbing force through the supports 6 and 7 to the base.

Claims (1)

Vibro-exciter comprising a drive shaft rigidly attached thereto. the imbalance encompassing it and mounted to be rotatable around an axis and axially moving a second unbalance and a fixing mechanism of unbalances, characterized in that, in order to increase reliability, the fixation mechanism is designed as opposedly placed on facing each other ends of the two balances of the annular grooves, performed at one of the ends of the balances and communicated with the corresponding annular groove of a groove having a triangular cross-section in the radial plane and a ball placed in the groove and having a diameter larger than the distance between the ends unbalance at / I FIG. 2 FI.1 Viib 17 fig.E Phage. four