RU33345U1 - Concrete Foam Mixer - Google Patents

Description

Concrete Foam Mixer

The utility model relates to the field of production of building materials and can be used to prepare a foam concrete mix in forced mixers.

Currently, the designs of forced-concrete mixer foaming of the initial components are widely known, made in the form of tanks equipped with pipes for supplying raw materials and outputting finished products, with mixing devices installed inside the tanks.

Closest to the claimed utility model in technical essence is a forced-action mixer with a rotating screw horizontally mounted inside it and equipped with nozzles for supplying solution and water. Foam under pressure is fed to the top of the mixer using a portable hose and at the same time it can be fed down the mixer through a special pipe with nozzles installed in the bottom of the tank. The finished foam concrete through pipelines is pumped to the destination with the help of a pump (US Pat. RF No. 2152871).

The efficiency of the foam mixer largely depends on the operation of the screws, on how they “gently act on the mixture without destroying the foam. In this mixer, the screw design is not so important, since the foam is supplied to the mixer both from the bottom up and from top to bottom, but such a foam supply scheme complicates the design of the mixer as a whole. Shipment of finished concrete through a pipeline to an object, firstly requires a powerful pump, and secondly reduces the mobility of the mixer, because he becomes attached only to this object. To switch it to another object, additional time and labor are required to change the concrete transportation scheme.

The task is to create a more mobile, structurally not complex and cost-effective mixer for the preparation of pneumatic concrete.

To do this, the known pneumatic concrete mixer, including a tank with a screw installed inside it and equipped with nozzles for supplying mortar, foam and output of the finished product, the tank is made with the possibility of its movement and further comprises a nozzle for supplying compressed

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IPC: B 28 C 5/38

air, nozzles for supplying mortar and foam are structurally combined, while along the screw line of the screw at an angle of 30 ° to its axis there are blades equipped with elastic aprons at the ends.

The utility model is illustrated by drawings.

Figure 1 - schematically shows a mixer for the preparation of foam.

Figure 2 - schematically shows the blades of the screw.

The mixer for the preparation of foam concrete contains a tank 1, inside which a screw 2 is installed. The tank is equipped with nozzles for loading mortar and foam 3, air supply 4 and unloading foam concrete 5. The tank is made with the possibility of movement, for example, on rails 6, for which it is mounted on the frame 7. The screw along the helix is equipped with blades 8, at the ends of which elastic aprons 9 are located.

The mixer for foam concrete works as follows.

Through the pipe 3, the cement mortar or cement-sand mortar is loaded, and foam is also fed into the tank 1. At the moment of loading the listed components, the screw 2 is turned on. Rotational speed

screw is 40 rpm. At the end of the loading, the pipe 3 is closed and air is pumped through the pipe 4 until the pressure in the mixer reaches 6 atm. Stirring is continued for about 3 minutes. During mixing, the mixer is moved along rails 6 to the molds (not shown in the drawing) for pouring the foam concrete mixture into them. The distance is 10-15 meters. After obtaining a homogeneous mixture, the pipe 5 gradually opens, through which the foam concrete mixture is unloaded into molds. Unloading occurs under the influence of excessive pressure in the mixer by gravity.

The positive effect of the proposed mixer for the preparation of foam concrete is that due to the shape of the blades and the presence of elastic aprons at the ends, it is possible to softly mix the foam with the water-cement mixture and thereby protect it from premature destruction. In addition, when sliding aprons on the inner surface of the mixer, it is not damaged by contact with the blades.

The constructive combination of loading nozzles for mortar and foam simplifies the design of the mixer, contributes to better foam saturation of concrete, and most importantly simplifies the scheme for receiving water-cement mortar.

directly from the widespread mortar-concrete plants of high productivity, with an automated unloading process. The diameter of the loading nozzle and the height of its location should be 500 mm and 4 meters, respectively.

The location of the mixer on a frame moving on rails makes it mobile, more economical and convenient to use.

Claims (2)

1. Foam mixer, comprising a tank with a screw installed inside it and equipped with nozzles for loading mortar and foam and unloading the finished product, characterized in that the tank is made with the possibility of its movement and further comprises a nozzle for supplying compressed air, while the nozzles for feeding the solution and foams are structurally combined, and blades are installed along the helical line of the screw at an angle of 20-45 ° to its axis. 2. Foam mixer according to claim 1, characterized in that the blades at the ends are equipped with elastic aprons.