RU151220U1 - DEVICE FOR EXCITING MECHANICAL OSCILLATIONS - Google Patents

Abstract

A device for exciting mechanical vibrations, consisting of a body made in the form of a closed circular cylindrical shell, an electric drive, a rotating shaft and a rod on which several loads of different weights are fixed at the same time.

Description

The utility model relates to devices for generating and exciting oscillations of a wide range of frequencies and amplitudes and can be used in industrial and civil engineering, vibration machines used in construction, transport, metalworking, machine tools, mining and other industries where vibration is used, and also in mechanical engineering and other branches of technology.

A device for exciting vibrations is known from the state of the art, comprising a cylindrical body with a treadmill running around the ball, a drive shaft mounted on the axis of the body, and a carrier rigidly mounted on the drive shaft and provided with lobes enclosing the ball (US 2829529 A).

A device is known, made in the form of a cylindrical body fixed to a metal structure with an internal treadmill, driven by a ball of a shaft and a drive mounted on the axis of the body and rigidly mounted on a carrier shaft, made in the form of a rod with an element for point contact with the ball (SU No. 656673) .

The disadvantages of this technical solution are the impossibility of obtaining a wide range of frequencies and amplitudes of excited vibrations and the relatively low reliability of the device during operation, due to the point contact of the element with the ball, which cannot be carried out for a long time due to the fact that the sliding friction force leads to rapid wear of the ball and drove and premature destruction of the device as a whole.

It is also known a device containing a hammer, made in the form of a ball mounted inside the housing and moved by a carrier, made in the form of a rod. Energy is transmitted to the ball as a result of the rotation of the carrier, which leads to force interactions of the striker with the body and the occurrence of vibrations (RU No. 2204444, class B06B 1/16, 2003, bull. No. 14).

The disadvantages of this device are not a wide range of frequencies, amplitudes of the excited oscillations, as well as the low stability of the excited oscillations and the low energy of the generated oscillations.

Closest to the claimed technical solution is a device for exciting vibrations, comprising a cylindrical body with an internal treadmill run in by a ball, a drive shaft mounted perpendicular to the axis of the body, and a carrier made in the form of a rod at the ends of which ball bearings are installed, while the diameters of the ball and the outer cage of the ball carrier drove are in a ratio of 2: 1 (RU No. 2275971).

The disadvantages of this technical solution is that the excitation of high-frequency modes of operation is accompanied by relatively large amplitudes of the oscillations of the object to which the impact is applied and, as a result, the oscillations of the device. With fluctuations of the device and the effective force of gravity of the balls, their friction, This feature can lead to disruption of the excited oscillations, unstable operation of the device and rapid wear of the device parts - carrier, ball bearings (Strength. Stability. Oscillations. Reference book. M .: Engineering. 1968. - T. 3. 567 s).

The task to which the claimed utility model is directed is to create a device that can stably excite oscillations of a wide range of frequencies and amplitudes.

The technical result is to obtain a device with a wide range of frequencies and amplitudes of excited oscillations with high stability and stability.

The devices described above, in particular RU No. 2275971, do not allow to achieve the claimed technical result, since when receiving high-frequency oscillations, the shaft rotation speed can be so small that the balls, at a certain location of the device, and under the action of their own gravity will be torn off from the balls being rolled platforms in a circular cylindrical shell. In addition, when receiving high-frequency and low-frequency oscillations, the device’s vibrations will cause certain interference, disruption of vibrations arising due to the impact of balls on a rotating rod or due to separation of balls from a rolling surface, which will lead to unstable operation of the device.

The novelty of the proposed technical solution lies in the fact that several loads of different weights are attached to the rod at the same time, which allows to obtain a wide range of vibration frequencies. For a theoretical rationale for this feature, see “Strength. Sustainability; Oscillations. " Directory. M .: Engineering. 1968.- T. 3. 567 s. etc. In addition, the load is attached to the rod rigidly, which allows you to excite high-frequency oscillations with large amplitudes with high stability and stability of the device.

The device of a utility model is shown in Fig., Where

1 - device body;

2 - electric drive;

3 - shaft;

4 - a core;

5- cargo;

6 - waveguide;

7 - a design in which it is necessary to cause mechanical vibrations.

The device is made in the form of a device 7 fixed to a certain structure 7 through a waveguide 6 of the device body 1. The body 1 is made in the form of a closed circular cylindrical shell, which is connected to the electric drive 2. The electric drive can be of any power, as well as with a power adjustment function. Inside the electric drive 2 there is a rotating shaft 3, which penetrates into the housing of the device 1 and drives the rod 4. Weights 5 are attached to the rod 4, which can be attached at any point along the entire length of the rod 4. The device operates as follows.

The inclusion of the electric drive 2 drives the shaft 3, which in turn rotates the rod 4, which is rigidly fixed to it, to which the loads 5 are attached. The centrifugal forces created by the rotation of the rod 4 with the loads 5 excite in the cylindrical body 1 oscillations of a wide range of frequencies and amplitudes, which through the waveguide 6 are transmitted to the structure in which it is necessary to cause oscillations.

8 FSBEI HPE “KnAGTU” (Komsomolsk-on-Amur) created and tested two devices. The essence of the first device is similar to RU No. 2275971. And the second device is declared in this utility model.

As a result of the experiment, it was revealed that a device similar to RU No. 2275971 stably works only at relatively high shaft revolutions, which allows generating high-frequency oscillations. At low speeds, shocks are heard and the BC 110 vibration transducer recorded an increase in frequency. This is due to the impact of the balls on the rod or body of the device during their fall inside the shell.

In addition, the mass ratio of the balls 2: 1 does not allow under such conditions to obtain a wide frequency spectrum.

A device made on the basis of the claimed technical solution at high and low speeds works stably. That is, there are no disruptions in vibrations and jumps in the frequency spectrum, which were monitored and recorded by a special measuring device - the BC 110 vibration transducer.

The proposed technical solution allows to obtain a wide range of frequencies and amplitudes of the excited oscillations with high stability and stability of the device.

Claims (1)

A device for exciting mechanical vibrations, consisting of a body made in the form of a closed circular cylindrical shell, an electric drive, a rotating shaft and a rod on which several loads of different weights are fixed at the same time.

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