RU1816516C - Vibration exciter - Google Patents

Abstract

Usage: in vibration technology. SUMMARY OF THE INVENTION: the vibration exciter comprises a housing 1 rotatably disposed therein, shaft 2 with a drive wheel rigidly fixed thereon, which is made with two hubs 3 and 4. One of the hubs 3 is made integral with the shaft 2. and on the extension of this shaft 5, the hub 4 is fixed by means of a key 6 and the tail portion 7 of the shaft 5 with a thread and a nut. An odd number of rollers 10-14, evenly spaced around the circumference of the wheel, are mounted on the drive wheel in the hubs 3 and 4 on the axles with the possibility of rotation. The frame 17 is mounted in the guides 18 and 19, fixed in the housing 1 and enclose the rollers 10-14 of the drive wheel 3 and 4 around the inner surface. The frame 17 is pivotally connected to the pusher 20 connecting it to the working body. 2 z.p., f-ly, 4 ill.

Description

Iobration is related to mechanical engineering and can be used in vibration technology.

The purpose of the invention is to increase efficiency.

Figures 1 and 2 show transverse and longitudinal sections of vibration exciters; Figs. 3 and 4 show in cross section the interaction of the main structural elements of the exciter during its operation.

The vibration exciter contains a housing 1, a rotatably disposed shaft 2 therein with a drive wheel rigidly fixed thereon, which in FIG. 2 is shown made with two hubs 3 and 4. One of the hubs 3 is made integrally with the shaft 2, and to continue this shaft 5, the hub 4 is fixed using the dowel 6 and the tail .7 of the shaft 5 with a thread and a nut. In this case, the shaft 2 is composite with the extension of the shaft 5, the tail part, the shaft 7 and the hub 4 and has a bearing 8, and the wheel hub 4 is a bearing 9. Both bearings 8 and 9 are mounted in the housing 1. On the drive wheel in the hubs 3 and 4 on the axles with the possibility of rotation, an odd number of rollers 10 ... 14 are installed, evenly spaced around the circumference of this Wheel (see Fig. 1). The axes of the rollers 10 ... 14 are mounted in bearings, for example, 15 and 16 (see figure 2.) for the roller 10, located in the hubs 3 and 4, and parallel to the shaft 2 and its extension 5 and 7. The vibration exciter has a frame 17 mounted in guides 18 and 19, mounted in the housing 1, and covering the rollers 10 ... 14 of the drive wheel 3 and 4 with its inner surface drawings not shown). The hinge connection is depicted using a bolt 21.

Vibration exciter works as follows.

When the hubs 3 and 4 of the drive wheel rotate, the rollers 10 ... 14 alternately come into contact with the opposite surfaces of the frame 17, perpendicular to the guides 18 and 19, as well as the axis of the pusher 20 (see figures 1, 3 and 4). In the position shown in FIG. 1, the roller 10 is in contact with the surface of the frame 17 closest to the pusher 20. Further rotation of the drive wheel with the shaft 2 and its continuation 5 leads to the withdrawal of the roller 10 from the contact surface of the frame 17 and to the beginning of the interaction of the roller 12c farthest relative to the pusher 20 by the surface of the frame 17 (see Fig. 3). When the wheel rotates from the position of the rollers 10 ... 14,

shown in FIG. 1, prior to contacting the frame 17 of the roller 12 shown in FIG. frame 17 remains stationary due to its flat contact surfaces. when

the roller 10 opens from the contact surface of the frame 17 closest to the pusher 20, and the roller 12 has not yet begun to contact the opposite said surface of the frame 17. After the contact of the roller 12 with

by the frame 17 shown in Fig. 3, the rotation of the wheel moves the frame 17 from one extreme position shown in Fig. 1 to another such position shown in Fig. 4. Indicated movement

occurs according to a sinusoidal law. In the future, again there is a break in the movement of the frame 17 until it starts to contact the surface of the roller 14 closest to the pusher 20, which, as shown

1, the roller 10 moves the frame 17 to another extreme position. Thus, the rollers 10 ... 14, changing each other, move the frame 17 from one extreme position to another, creating a vibration that

by means of the pusher 20 is transmitted to the working body.

In Figs. 3 and 4, the letters indicate: B is the width of the window frame 17 in the direction of its movement;

R is the radius of rotation of the axes of the rollers 10-14;

g is the radius of the rollers themselves 10-14;

the a-angle of the position of the axis of rotation of the rollers 10 ... 14 at the moment of their contact with the frame 17.

Using the indicated notation and taking into account the described, the displacement of the frame 17 and the pusher 20 can be determined from the following expression

(R + r) -B (1)

Hence the vibration amplitude, equal to half the amount of movement of the frame 17 of the collider 20, can be written in this form:

b R + r-f (2)

From the expression (2) it follows that the amplitude of vibration 6 can be adjusted by changing the width of the window B of the frame 17.

The vibration frequency is proportional to the number of rollers 10 ... -14 and the rotational speed of the shaft 2. By changing the latter, various values of the vibration frequency can be obtained.

By profiling the contact surfaces of the frame 17, it is possible to obtain a sinusridal waveform.

The described vibration exciter has a simple design, high load capacity and durability and can be used to obtain vibration of mechanisms in the frequency range from fractions of Hertz to 500 Hertz and amplitude from fractions of a millimeter to several millimeters at a frequency of hundreds of Hertz, as well as several centimeters in the range frequencies of the Hertz fraction.

F o rmul izobret n and

Claims (3)

1. A vibration exciter comprising a housing, a rotatable shaft disposed therein with a drive wheel rigidly fixed thereon, and an odd number of roles Cove. characterized in that, in order to increase efficiency, it is equipped with a guide rigidly mounted on the housing, a frame covering the drive wheel with rollers and mounted to move along the guide and alternately interact with opposite sides perpendicular to the guide with one of the rollers and a pusher articulated to the frame. 2. The vibration exciter according to claim 1, with the fact that the drive wheel is made with two hubs fixed to the shaft. 3. The vibration exciter according to claim 2, with the fact that one of the hubs of the drive wheel is made integrally with the shaft, and the shaft itself is composite. Figl