SU944676A1 - Parametric vibration apparatus - Google Patents

Description

one

The invention relates to a vibration technique and can be used in mechanical engineering for testing products for vibration.

A parametric vibration device is known, which contains an elastic element of variable bending stiffness, made in the form of a cantilever beam, a rotational drive connected with parallel-installed non-circular plates, between which the elastic element 1 is placed.

The disadvantages of such a device are the narrowly limited spectrum of excited frequencies and reduced efficiency due to the excitation of parasitic oscillations.

Closest to the invention in technical essence and the achieved result is a parametric vibration device comprising a base, an actuator, a vibrating table, an elastic system located between the base and the vibration table and an adjustment mechanism for the elastic system. The elastic system is made in the form of an elastic element that operates on a bend and is connected with the drive by a system of pull and double-arm levers. The adjustment is made by rotating the pin.

rigidly connected with the elastic element and changing the initial force acting on it 2.

A disadvantage of the known device is low work efficiency due to the complexity of the design and the inability to control the elastic system during operation.

The aim of the invention is to increase work efficiency.

Claims (2)

This goal is achieved by the fact that in a parametric vibration device comprising a base, an actuator, a vibrating table, an elastic system located between the base and a vibrating table, and an elastic system regulating mechanism, the elastic system is made in the form of two opposed-arranged elastic bending, the adjustment mechanism of the elastic system and the drive are made in the form of an electromagnet, 20 whose body is fixed in the middle part of one of the elastic elements and the measles in the middle part of the other GoGo elastic member so that the longitudinal axis of the electromagnet is perpendicular to the direction of movement of the vibrating table. The elastic elements are made in the form of plates and are hinged on the table and the base with the displacement of the centers of the hinges relative to the mid-plane of the plates. In addition, the device is equipped with additional nonlinear elastic elements with adjustable characteristic installed between the vibrating table and the base. The drawing shows the device, a longitudinal section. . The parametric vibratory device comprises a base 1, a vibrating table 2, an elastic system consisting of elastic elements 3 and 4 working on longitudinal bending. The adjustment mechanism of the elastic system and the drive are made in the form of an electromagnet, the body 5 of which is fixed in the middle part of the elastic element 3, and measles 6 - in the middle honor of the elastic element 4 in such a way that the longitudinal axis of the electromagnet is perpendicular to the direction of movement of the vibrating table 2. The elastic elements 3 and 4 are made in the form of plates, hinged on the table 2 and base 1 with the displacement of the centers of the hinges 7 relative to the median plane of the plates. The device is equipped with additional elastic elements 8 with adjustable characteristic. Parametric vibration device operates as follows. A test article 9 is placed on the vibrating table 2, the mass of which causes the longitudinal deformation of the elastic elements 3 and 4. At the same time, their middle parts move towards each other. By applying a constant voltage to the electromagnet, the deflection of the elastic elements 3 and 4 can be adjusted. The oscillations of the system are excited by applying a variable shape to the coil. The magnitude of the voltage fluctuation determines the vibration amplitude of the vibration table 2. The vibration amplitude of the vibration table 2 is limited by additional nonlinear elastic elements 8, the characteristics of which can be changed with screws 10. The invention allows to expand the efficiency of the device by simplifying the design and ensuring Possibilities of regulation by an elastic system in the course of work. Claim 1. Parametric vibratory device comprising a base, an actuator, a vibrating table, an elastic system between the base and the vibration table, and an elastic system for controlling the elastic system, characterized in that, in order to increase work efficiency, the elastic system is made in the form of two opposedly located working on the longitudinal bending of elastic elements, the mechanism for regulating the elastic system and the drive are made in the form of an electromagnet, the body of which is fixed in the middle part of one of prugih elements and armature - in the middle portion of another elastic member such that the longitudinal axis of the electromagnet is perpendicular to the direction of movement of the vibrating table. 2. The device according to claim 1, characterized in that the elastic elements are made in the form of plates and hinged on the table and the base with the displacement of the centers of the hinges relative to the median plane of the plates, 3. The device according to claim 1, characterized in that it is provided with vibration table and base with additional nonlinear elastic elements with adjustable characteristic. Sources of information taken into account during the examination 1. USSR author's certificate No. 484902, cl. B 06 B 1/10, 1972. 2. USSR author's certificate Ns 706136, cl. B 06 B 1/10, 1978 (prototype). /