SU1542814A1 - Vibration-impact rotational table for compacting articles from concrete mixes - Google Patents

Description

The invention relates to the production of precast concrete and reinforced concrete and improves reliability and usability. Vibro-shock torsion area for compacting concrete products is provided with a torsion located along its vertical axis in the form of supporting ring disks 8 and 9 fixed to the mobile 2 and balancing 3 frames of supporting annular disks 8 and 9 connected to each other by inclined plates 10. Each plate 10 in cross section is bent along the radius the tangent to its convex surface intersects the vertical axis of the torsion, and the pathogen 7 of vertically directed oscillations is mounted on one of the frames symmetrically to the same axis. 4 il.

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FIG. one

3

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four

The invention relates to the production of precast concrete and reinforced concrete.

The purpose of the invention is to improve the reliability and ease of operation.

FIG. 1 schematically shows a vibro-impact torsion area for compacting concrete products, a section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - torsion, general view; in fig. 4 shows a section BB in FIG. 3

Vibro-shock torsional platform for sealing products from concrete mixtures consists of mobile 2 installed on the base and interconnected by means of elastic elements 1 and balancing 3 frames. On the upper plane of the balancing frame 3, elastic buffers 4, which are pulled out with the help of a screw pair, are fixed, forming a calculated gap and with the lower plane of the moving frame 2. which coincides with the vertical axis of the site, passing through its center of gravity.

On the inner surface of the movable frame 2, a pathogen of vertically directed oscillations 7 is mounted, capable of generating various driving forces as the movable frame moves up and down. This can be achieved, for example, in a four-shaft vibration exciter by rotating the unbalances on two shafts with a frequency to it, and on two - with a frequency of 2xg. When installing the vibration exciter on a movable frame, the driving force down must be greater than upwards. When installing the vibration exciter on the balancing frame, taking into account the antiphase nature of the oscillating masses - on the contrary.

The torsion bar 6 is made in the form of the upper 8 and lower 9 supporting annular disks connected to each other by inclined plates 10, each of which is curved in cross section along a radius, and the tangent to its convex surface intersects the vertical axis of the torsion 6. The dynamic parameters of the system are chosen so that to provide a resonant mode of vertical and torsional vibrations.

Vibro torsional platform for compacting concrete products works as follows.

After fixing the round shape 11 on the movable frame 2 and filling it with rigid concrete, the pathogen of the vertically directed oscillations 7 is turned on, which informs the movable frame 2 and the counterbalancing frame 3 of antiphase vertically directed oscillations, and

power down more than up. When the torsion bar 6 is compressed in the inclined plates 10, horizontal forces occur, which rotate in opposite directions of the movable frame 2 and the balancing frame 3 about their vertical axis, i.e., torsional oscillations arise. Since the mode is adopted resonant, significant vertical and angular amplitudes of oscillations are realized. Concrete particles in circular form 11 are reported intensive spatial acceleration along a helical line. During the downward movement of the working organ, large forces from the causative agent of vertical directional vibrations 7, torsion 6 and collisions with buffers 4 are added up. When the working organ moves upward, only forces from the causative agent of vertical directional vibrations 7, which are smaller than the lower ones, act on the concrete. This is explained by the correspondingly opposite arrangement of unbalances on the shafts of the pathogen of vertically directed oscillations in the extreme upper position of the movable frame and lower torsion rigidity when it is stretched. With less effort, the concrete can be decompressed. Thus, a significant asymmetry in the loads (accelerations) on the concrete allows to obtain a high compaction coefficient.

After reaching the required degree of compaction of concrete, the pathogen of vertically directed oscillations 7 is turned off and the form 11 is removed from the working body.

Claims (1)

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