SU1646617A1 - Device - Google Patents

Abstract

The invention relates to vibration technology and can be used to excite various mechanical structures, as well as to drive vibratory feeders, vibratory hoppers and other vibratory machines. The aim of the invention is to increase the excitation reliability by providing a constant amplitude of oscillations and simplifying, controlling the amplitude of the excited oscillations. The excitation is produced by the dynamic force of the oscillating frequency in the frequency range, which includes the resonant frequency of the elastically suspended mass of the exciter. 5 il.

Description

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The invention relates to a vibration technique and can be used to excite various mechanical structures, as well as to drive vibratory feeders, vibratory hoppers and other vibratory machines.

The purpose of the invention is to increase the excitation reliability by providing a constant amplitude of oscillations and simplifying control of the amplitude of the excited oscillations.

Fig. 1 is a block diagram of a device for driving oscillations; 2 shows diagrams explaining the principle of operation of the device; on Lig.Z and 4 are the characteristics of the energy transferred to the excited structure: in Fig. 5, the regulating characteristics of the energy transferred to the excited structure, depending on the swing speed.

The device for exciting oscillations contains an electromagnetic vibration exciter 1 connected to the output of a frequency converter 2 (thyristor inverter), the first input of which is connected to power supply unit 3, and the second input switch - to trigger output 4 via demultiplexer 5, counter 6 and digital generator 7, moreover, the input of setting zero of trigger 4 is connected to the block of code switch 8 for setting the upper swing limit - through the first code converter 9 and the first digital comparator 10, and the input of setting the unit of trigger 4 to the block of code a setting switch 1i for the lower swing limit through the second code converter 12 and the second digital comparator 13. In addition, the code switch 14 for setting the swing speed is &

four

About MA

316/466174

is not connected with the second input of demultiplexer 4. The output of trigger 4 is connected to

ra 5 through a frequency divider 15 that controls the input of the demultiplexer

the stroke of the counter 6 is connected to the second 5 and depends on the state of the trigger 4

the inputs of the first 10 and second 13 digital-mode demuxes and

Date: 28/03/2000

Number of pages: 4

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UNION OF SOVIET SOCIALIST REPUBLICS.

STATE COMMITTEE ON INVENTIONS AND DISCOVERY AT PRCS USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(7.1) 384242./Y

(22) 01/09/85.

(4b) 03/07/91. Bul ff 17

(72) I.A. Samarin

(53) 532.4 (088.8)

(56) Patent of Great Britain No. 1379955, cl. K 4 L, pub. 1975.

(54) ELECTROACOUSTIC CONVERTER

(57) The invention relates to an ultrasonic technique and can be used. The invention relates to acoustics, in particular to an ultrasonic technique, and can be used in technological equipment for washing impregnation, welding, etc.

The purpose of the invention is to increase the maximum allowable output power while improving reliability and stability.

PA figure 1 shows the transducer, the section with the piezoelectric elements in the form of a set of piezoceramic rings (a) and a set of piezoceramic disks (b); Figures 2 and 3 are graphs of the distribution of vibration amplitudes and mechanical stresses, respectively. The electroacoustic transducer contains two piezoelectric elements 1, each of which consists of two rings or disks. From the edges of the transducer piezoelectric, the passages are separated by passive elastic elements 2 in the form of nuts (Fig. 1) or cylinders with an external thread (Fig. 16), and a passive (19) is installed between the element elements 1.

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It is called for in the technological equipment of washing, degreasing, impregnation, etc. The purpose of the invention is to increase the output power with simultaneous reliability and stability of operation. A passive elastic element with a length equal to an odd number of quarters of the working wavelength is placed between the transducer piezoelectric elements, due to which the piezoelectric elements operate at lower mechanical stresses arising during operation. 3 il.

The new elastic element 3, whose length is equal to an odd number of quarters of the working wavelength. Between the piezo ceramic rings or discs that make up the piezoelectric elements I, contact petals 4 are installed, and the entire transducer is made with a pin 5 (Fig. 1a) or flare nuts 6 (Fig. 1b). When connected to the ultrasonic generator, the passive elements of the transducer are grounded, and the generator output (not shown) is connected to the parallel-connected petals 4. As a result of the inverse piezoelectric effect, the elastic oscillations that are formed interfere, a total wave is formed, the amplitude of which is 2 times larger than the amplitude of the wave each of the piezo elements (Fig. 2), i.e. The converter power is more this number. Piezo elements are located in the field of mechanical stresses, which are less than the greatest value (1).

Claims (1)

elastic element 3, the length of which is equal to an odd number of quarters of the working wavelength. Between the piezoceramic rings or disks forming the piezoelectric elements I, contact tabs 4 are installed, and the entire transducer is pulled together with a pin 5 (Fig. 1a) or union nuts 6 (Fig. 16). When connected to an ultrasonic generator, the passive elements of the transducer are grounded, and the output of the generator (not shown) is connected to the parallel connected petals 4. As a result of the inverse piezoelectric effect, the elastic vibrations generated in this case interfere, a total wave is formed whose amplitude is 2 times the amplitude of the wave propagating from each NC piezoelectric elements (figure 2), i.e. converter power is greater than η this number of times. The piezoelectric elements are located in the region of mechanical stresses less than the highest value (Fig. 3), which contributes to