SU1759630A1 - Platform vibrator for compaction of concrete mixtures in mold - Google Patents

Abstract

Use: in the manufacture of precast concrete and reinforced concrete. SUMMARY OF THE INVENTION: The vibrating plate contains a vibrating channel 1 supported by the base 2 by means of the main supporting and auxiliary bent plates 4. Each plate 4 is equipped with a screw mechanism 6 horizontal movements of one of its ends, the other end is fixed in the base plate 2. The bent plates 4 are made elastic and reversed bulge up. In this case, the length of their sweep exceeds b - 7 times their thickness. 2 Il.

Description

This invention relates to the manufacture of products from precast concrete and reinforced concrete.

A vibrating plate is known, comprising a spring-loaded vibrating tool with roller guides mounted on its upper plane and an elastic gasket. This design is characterized by low reliability of the guides and a short service life of the elastic gasket. In addition, with an arbitrarily chosen rigidity of an elastic gasket and a form freely installed on it with concrete, the oscillation frequency is halved, which prevents stiff concrete mixtures from being compacted.

The closest technical solution to the proposed is vibroplatform for compacting concrete mixes in the form, containing at least one vibroblock, supported on the base by means of supports located along its perimeter and having basic and secondary elements in the form of curved plates mounted on the base plate.

The disadvantage of this device is the impossibility of adjusting the operating mode of vibration compaction.

The purpose of the invention is to intensify the process of compacting concrete by adjusting it to the optimum mode of operation.

To do this, in the vibrating platform for compacting concrete mixes in a form containing at least one vibroblock, supported on the base by means of supports arranged along its perimeter, having main and auxiliary elements in the form of bent plates mounted on the base, each auxiliary element is provided with a screw mechanism horizontal movements of one of the ends of the bent plate, the other end of which is fixed in a groove formed in the base plate, bent plates

sl o (

with

about

filled with elastic and convex upward, and the length of the sweeps of the latter is 6 - 7 times their thickness.

Fig. 1 schematically shows a vibrating plate (supporting part); figure 2 - the same, with increasing load and maximum stiffness of the elastic plates.

The vibrating platform contains at least one vibroblock 1. supported along the perimeter on the base 2 by means of interlocked basic support elements 3 and auxiliary in the form of curved plates 4. The latter play the role of additional adjustable elasticities and are intended to stabilize the oscillation amplitude with increasing load. Elastic arcuate plates 4 are installed with a bulge upward, with one end of each plate fixed in the groove 5 of the frame and the other pressed by a screw mechanism 6 including a bracket 7 with a thread and a screw 8 passing through it with a clamp 9 of translational motion. At the maximum distance between the ends of the plate, its rigidity is minimal (figure 1), when the ends are in contact, it is maximum. For real structures, the thickness of the elastic plate D is 6–7 times less than its unrolled length L At –d 7, the rigidity of arcuate, for example, rubber plates decreases, which reduces the load capacity, and the dimensions between the ends increase.

When -d 6 and the plate's maximum compression

its upper part produces significant bending stresses which, when a certain number of cycles of vibration are reached, break the plate.

The stiffness of the main supports 3 and the auxiliary elastic plates 4 is chosen so as to provide a resonant intensive vibration mode with a ratio of the frequency of forced vibrations to the resonant, equal to 3-4. A high amplitude of oscillations is required (for example, 1.5 mm is most optimal at a frequency of 24 Hz) should be the same as with a minimum load (1/4 - 1/3 of the carrying capacity), so

and maximum. In the second case, this should be ensured by limiting compression until the elastic plates c.

The vibrating platform works as follows

in a way.

A vibrating unit (vibratory units) 1 is installed and secured with a form with concrete, the weight of which constitutes a smaller part of the carrying capacity. The vibratory unit 1 is supported on the supporting shock absorbers 3 and partially preloaded elastic plates 4. An electric motor (not shown) is turned on, generating a predetermined forced frequency to the unit's causative agent. After intense vibration with an optimal amplitude and duration, the form is removed and transferred to the post of steaming.

When changing the product range

and increasing the load, for example, up to the maximum, rotating the screw 8 with the handle, pushing the clamp 9 until the ends of the plates 4 touch. The increase in the total stiffness of the supports is proportional to the increase

load keeps the resonance curve in its original position, which practically ensures the stability of a given amplitude of oscillation.

Claims (1)

Invention Formula A rotary platform for compacting concrete mixtures in a mold, containing at least one vibroblock, supported on the base by means of supports arranged along its perimeter, which are interlocked in pairs and mounted on the base plate, the main and auxiliary elements in the form of curved plates, characterized in that Intensification of the compaction process by adjusting for optimal operation, each auxiliary element is equipped with a helical mechanism for horizontal movements of one of the ends of the bent plate, ugoy end of which is fixed in a groove formed in the base plate, the curved plate are elastic and convexity facing upwards and the latter sweeps length exceeds b - 7 times their thickness. (////////////////////// 7/7/7 //// 7777Л FIG. § Our -M / f / f / fiu.  /////////////// A