SU1237436A1 - Table vibrator - Google Patents

Description

The invention relates to devices for vibrating the materials and can be used in the manufacture of articles of concrete and reinforced concrete.

The purpose of the invention is to increase productivity by providing the possibility of tuning to the optimum mode.

Figure 1 shows the proposed vibroplatform, a general view; figure 2 - section aa in figure 1; fig.Z - screw mechanism.

The vibrating platform contains a balancing frame 3 installed on a base 1 on elastic supports 2 with 4 cranking oscillation exciters, cranks 5 of which are connected to working device 7 by means of elastic elements 6 and are supported by shock absorbers 8 on balancing frame 3 and contact with it buffer elements 9.

Additional shock absorbers K) of the working body 7 are connected by means of contacting vertical stops 11 with the base 1.

The balancing frame 3 is made in the form of horizontally movable upper 13 and lower 14 wedge elements connected with each other by means of a screw mechanism 2 and connected with each other by means of a screw 15. Buffer elements 9 are fixed on the upper wedge element 13, and shock absorbers 8 and elastic supports 2 - on the lower wedge element 14.

So that the gap size e at any technological load remains optimal and ensures the stability of the amplitudes of the working device, the rigidity of the shock absorber Ca, the elastic supports Co and the additional shock absorbers Cz are related by

one

TO

vj vjfj r e

the coefficient of proportionality between the technological load P and the magnitude of the change in the optimal gap between the buffer elements and the working body (K), determined by known experimental or analytical methods. The platform works as follows

After installing the form on the working body 7 and filling it with a concrete mix, 4 oscillations of 4-way oscillator exciters, which inform the working body and the balancing frame 3, vertical asymmetrical oscillations in counterphase. The amplitude of oscillations of the working body is determined by the rigidity of the shock absorbers 8, the elastic supports 2, the additional dampers 10 and the buffer elements 9. The contribution of the latter to the total rigidity depends on the size of the gap e and increases as it decreases, and vice versa. Since the stiffnesses of the elastic bonds are chosen from the relation connecting the optimal gap e and the process load, the contribution of the rigidity of the buffers to the total stiffness due to the change in the gap e varies according to the optimal law simultaneously with the change in the technological load. Therefore, the eigenfrequency of the two-mass oscillatory system remains constant and different technological load does not affect the mode of operation of the vibrating plate: the amplitude of oscillations of the working body does not change and the compaction efficiency does not fall. After

5, the exciters are turned off and the form is removed from the working device.

Adjusting the vibrating plate to the optimum mode is carried out by setting the initial gap e between the buffer elements and the working body without the technological load. For this, the rotation of the shank of the screw mechanism 12 of the upper wedge element 13 is moved along the bevel of the lower wedge element 14, as a result of which the buffer elements 9 are displaced vertically relative to the working element and the gap e changes. After adjustment, the wedge elements are fastened to the monolith with screws 15. The horizontal displacement of the upper wedge element 13 relative to the transverse axis of the vibroplapdka does not cause significant changes in the position of the center of gravity of the balancing frame and does not affect the operation of the vibratory area. For example, when the wedge bevel angle is 7 ° and the gap e is adjusted within 8 mm

5, the displacement of the upper wedge element 13 is ± 30 mm, which does not exceed the error of the installation of the form on the working member.

0

five

V

/ f / / X / X // l / 77 7/7 7/7 / / X xx /

FIG. 2

fig.Z

Claims (1)

VIBRATION PLATFORM containing a balancing frame mounted on a base on elastic supports with crank oscillators, connecting rods of which are connected via elastic elements to a working body supported on a balancing frame by means of shock absorbers and buffer elements in contact with it, characterized in that, in order to increase performance by providing the ability to tune to the optimal mode, the working body is equipped with additional shock absorbers, connected by contacting x vertical stops with the base, and the balancing frame is made in the form of horizontally movable upper and lower wedge elements connected by bevels in contact with a screw mechanism, with buffer elements mounted on the upper wedge element, and shock absorbers and elastic supports on the lower . 6 5 4