RU1838111C - Head for radial molding structures from concrete mixes - Google Patents

Abstract

Usage: molding concrete and. Reinforced concrete tubular products, SUMMARY OF THE INVENTION: On a vertical drive shaft 1 there is a rigidly fixed disk 2 with tapering roller rollers 4, a guide skirt 5, mounted by rolling bearings, and an additional skirt 6. most formed from the drive shaft 1 forming the working surface of each roller 4 is parallel to the axis of rotation of the drive shaft 1. 3 ill.

Description

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The invention relates to the field of forming concrete and reinforced concrete tubular products on radial pressing machines.

An object of the invention is to prevent the rollers from sliding on the moldable mixture.

Figure 1 shows a head for radial pressing, plan view; figure 2 is a section aa in figure 1; in Fig.Z - section. B-B in Fig.2.

The head for radial pressing of concrete products consists of a drive shaft 1 with a disk 2 rigidly fixed on it, in which the axles 3 of the conical rolling rollers 4 are fixed. Under the rollers 4 there is a skirt 5 mounted on the drive shaft with a bearing. An additional skirt 6 is located below the guide skirt 5 and is rigidly fixed to the drive shaft by means of a key. A distribution disk 7 with scraper blades 8 is installed in the upper part of the head.

The head works as follows.

Concrete mixture is supplied from above to the rotating and vertically rising head, which is blown by the blades 8 to the mold 9, where it is pressed by rollers 4 that perform planetary motion - simultaneous rotation around its axis due to friction on the concrete to be formed and around the drive shaft together with the head.

The guide skirt 5 prevents the concrete from being squeezed out of the mold wall.

During operation, the skirt rises without rotation, as seated on a drive shaft on a bearing. The additional skirt 6, simultaneously performing a rotational and translational upward movement together with the shaft 1, wipes the inner surface of the tubular product and finally calibrates it.

During the molding process, the rolling rollers move along the inner surface of the tubular product in a spiral, as a result of their simultaneous movement along the circumference and vertical together with the forming head. In this case, the rollers move upward by rolling due to the conicity of their working surfaces, all points of which move along an arc of a circle with a radius equal to the distance from the imaginary vertex of the truncated cone to the point in question.

To completely eliminate the sliding of the rollers along the concrete mixture, it is necessary to coordinate the amount of their rise during vertical movement of the head with the vertical displacement of the rollers when rolling along an arc of a circle.

This makes it possible to completely replace the sliding friction of the rollers on the concrete mixture during vertical movement of the head with a lower rolling friction, which will reduce the intensity of the interaction of the rollers with the molded concrete

mixture and, accordingly, the degree of their wear, and will prevent the occurrence of shear deformations of the reinforcing cage and concrete mixture.

FORMULA AND ZOBRETIN

A head for radially pressing concrete products, comprising a disk with rolling rollers rigidly mounted on a vertical drive shaft, a guide located beneath it

a skirt with a hub mounted on the drive shaft by rolling bearings and rigidly fixed to. drive shaft additional skirt, characterized in that

the rollers are made in the form of truncated cones installed with a smaller base upward, while the most distant from the drive shaft forming the working surface of each roller is parallel to the axis

drive shaft rotation.

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