SU356142A1 - CONCRETE MIXER - Google Patents

Description

The invention can find application in the building materials industry and in construction.

Continuous concrete mixers for the preparation of mobile concrete mixtures are known, which contain a drum fixed on guide rims with support rollers and having a rotational drive, along the inner perimeter of which the blade is fixed and mounted between its turns of the blade.

The purpose of the invention is to provide the possibility of preparing a concrete mixture of high grades and a hard consistency, partially returning the mixture in the opposite direction to the movement of the mixture, and activating the mixing process.

This is achieved by the fact that the blades are set at an angle of 10-30 ° with respect to the generator of the cylindrical surface of the drum, passing along the ends of the blades, and each guide rim is made with an external contour in the form of a polyhedron.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 is a section along LL in FIG. one; in fig. 3 shows the layout of the working zones in the drum of the cytel cone; in fig. 4 is a diagram of the movement of the mixture along inclined blades during the operation of the concrete mixer.

The concrete mixer consists of a drum 1 with a hopper 2 and guide rims 3, each of which can be made with an external contour, for example, in the form of a polyhedron and mounted on support rollers 4. The drum 1 has a rotational drive 5, a screw 6 and installed between the turns of the blades 7, mounted at an angle of 10-30 ° with respect to the generatrix cylindrical

the surface of the drum 1 extending along the ends of the blades.

It works as follows.

The constituents of the concrete mixture enter through the receiving hopper 2 into the drum /, during rotation of which from the actuator 5, the screw 6 moves the mixture located in the lower zone a-ai (see Fig. 3). At the same time, the mixture is subjected to unmixing by the blades 7. In this case, the mixture is caught by the blades and rises in zone a - E. In the zone C, the mixture collapses. In zone a, the mixture is distributed along the blade mainly evenly.

(see Fig. 4, a).

With the passage of the blade in the zone a - e, the mixture moves towards the slope of the blade and its accumulation in the lower part of the blade (see Fig. 4.6). In zone in occurs

Thus, during its passage in zone a - b, the mixture is displaced in the direction opposite to the direction of motion 5 created by the screw 6 by a distance equal to:

,

where L is the path of the mixture in the direction opposite to the direction of movement, 5;

(1) is the distance from the edge of the blade to the center of gravity of the volume of the mixture captured by the blade at the beginning of the process of raising the mixture;

(2) is the distance from the edge of the forest to the center of gravity of the volume of the mixture captured by the blade at the time of the collapse. In order to ensure the forward movement of the mixture in the direction S, it is necessary that the mixture be mixed in the direction S be greater than L. The change in L is made by changing the angle of the ball.

The displacement of the mixture along the blades also creates an additional factor for its mixing.

LAMINATING dinners 3, made in the form of a polyhedron, by beating against the support rollers 4 cause oscillations of the drum 1 and associated screw 6 and blades 7, and oscillations of the latter are transferred to the mixture, activating the mixing process and improving the macrohomogeneity of the mixture.

Vibrating the mixing drum / also prevents the mixture from sticking to the screw 6 and vanes 7 and intensifies the mixing process.

Subject invention

Claims (2)

1. A continuous concrete mixer for preparing mobile concrete mixtures containing a drum fixed on guide rims with support rollers and having a rotational drive, the screw around the inner perimeter of which is fixed between its turns of the blade, characterized in that, in order to enable the preparation of concrete mixture high grades and hard consistency, partial return of the mixture in the direction opposite to the direction of movement of the mixture, and activation of the mixing process, blades 1I are set at an angle of 10-30 ° with respect to the generator of the cylindrical surface of the drum, passing along the ends of the blades. 2. A concrete mixer according to claim 1, characterized in that each guide rim is made with an external contour in the form of a polyhedron.