UA133639U - CAUSE OF TWO-FREQUENCY VIBRATIONS - Google Patents

Abstract

The activator of the two-frequency vibrations consists of a housing with a sleeve that mounts on the shaft, an imbalance on the housing, of loads mounted in a cavity, which is partially filled by the oil. The housing is made of non-magnetic material, and the sleeve is a magnet and has a profile for corrective loads.

Description

The useful model belongs to the generators of two-frequency vibrations and can be used, in particular, in such machines as screens, separators, vibrating screens, etc.

The design of the two-frequency vibration exciter is known, consisting of a housing with a bushing that is mounted on the shaft, an imbalance on the housing, loads installed in a cavity that is partially filled with lubricant. (Application of a passive autobalancer as an exciter of circular two-frequency vibrations, patent of Ukraine for a utility model Mo 92337).

The generator of two-frequency vibrations works as follows. During the start of the shaft, the loads are at the bottom of the cavity. Then they gradually get caught up in motion, cannot catch up with the shaft and get stuck at the platform's resonant frequency. When the shaft picks up the operating speed of rotation, the loads lag behind the shaft, which creates slow oscillations with the resonance frequency of the platform oscillations, and the imbalance on the body - vibrations with the frequency of rotation of the shaft.

This device is selected as the closest analogue.

The disadvantage of the device is the difficulty of fast and guaranteed acceleration of loads during shaft start-up.

The basis of a useful model is the task of achieving fast and guaranteed acceleration of cargo.

The solution to the problem is that in a known generator of two-frequency vibrations, which consists of a housing with a sleeve, which is mounted on a shaft, an unbalance on the housing, loads installed in a cavity that is partially filled with lubricant, according to a useful model, in order to quickly and guaranteed acceleration loads, the body is made of non-magnetic material, and the sleeve is a magnet and has a profile for corrective loads. At the same time, the loads are made in the form of balls or rollers.

The generator of two-frequency vibrations will work as follows. Due to the fact that the material of the case is not magnetic, but the bushing is magnetic and has a profile for loads, when starting the shaft, the loads are in contact with the bushing under the influence of the magnet. Then, under the action of centrifugal force, they gradually overcome the magnetic field, move away from the sleeve and get caught in motion, gather together, cannot catch up with the shaft and fall far behind it. When the shaft reaches operating rotational speed, the loads, also assembled together, lag behind the shaft, which creates vibrations in

From a vertical plane with a resonant frequency of platform oscillations (Filmonihin G.B. Patent

of Ukraine on the useful model Mo 92337), and imbalance on the body - vibrations with the frequency of rotation of the shaft.

Regardless of the loading of the platform, the loads in the two-frequency vibration exciter will automatically adjust to the resonant frequency of the platform's vibrations, and depending on the load, this frequency may change. Loads can be balls or rollers.

In fig. 1 shows an exciter of two-frequency vibrations with loads in the form of balls, in Fig. 2 - exciter of two-frequency vibrations with loads in the form of rollers.

Examples of specific implementation.

Example 1: In Fig. 1 shows a generator of two-frequency vibrations, which consists of a housing 1 with a sleeve 2, which is mounted on a shaft 3, an imbalance 4 on the housing 1, loads 5 installed in a cavity 6.

The generator of two-frequency vibrations will work as follows. During the start of the shaft, the loads are in contact with the sleeve under the influence of the magnet. Then they start to rotate with the shaft. Then, under the action of centrifugal force, they gradually overcome the magnetic field, move away from the bushing and get stuck at the lowest resonant frequency of rotation of the shaft. When the shaft reaches operating speed of rotation, the loads, also collected together, lag behind the shaft, which creates vibrations in the vertical plane with the resonance frequency of the platform oscillations, and the imbalance on the body - vibrations with the frequency of rotation of the shaft.

Example 2: according to example 1, it differs in that loads 5 are made in the form of rollers - Fig. 2.

Claims (3)

USEFUL MODEL FORMULA 1. An exciter of two-frequency vibrations, which consists of a housing with a bushing, which is mounted on a shaft, an imbalance on the housing, weights installed in a cavity that is partially filled with lubricant, which differs in that the housing is made of a non-magnetic material, and the bushing is a magnet and has profile for corrective loads. 2. The method according to claim 1, which differs in that the loads are made in the form of balls. 3. The method according to claim 1, which differs in that the loads are made in the form of rollers.