SU1216309A1 - Apparatus for mixing and feeding concrete mixes - Google Patents

Description

The invention relates to the construction, in particular to devices for mixing and transporting compressed air-dense concrete mixtures through pipelines, and can be used in the production of concrete work for the construction of a scientific research institute for floors and other monolithic structures.

A device for mixing and feeding concrete mixtures is known, comprising a mixing tank with a charging port, a discharge pipe, a paddle shaft with a plastic valve, air ducts that are connected to the mixing tank and a discharge pipe, and a material pipeline with a removable lid at the outlet end for shut off the pipeline when flushing the discharge pipe to prevent it from clogging l,

The lack of such a device is hampered by the low efficiency of its operation due to the breakthrough of compressed air in the material pipe through the concrete mixture conveyed in it.

The closest to the invention is a device for mixing and feeding concrete mixes, containing a mixing tank with a loading hatch, a discharge nozzle with a blade shaft and a plate valve, air ducts connected to the tank and a discharge nozzle, and a material pipeline with a device for creating inside its back pressure is 2J.

The disadvantages of the known device are spraying the concrete mixture when it is dispensed to the consumer, worsening the conditions of operation of the device, as well as low reliability of its operation due to incomplete overlapping of the outlet of the material pipeline with the rotary valve of the device or creating counter pressure in it when the valve is clogged with concrete.

The purpose of the invention is to improve the operating conditions and increase the reliability of the device.

This goal is achieved by the fact that in the device for mixing and supplying concrete mixes containing a mixing tank with a loading hatch, a discharge pipe

com., blade shaft with a plate valve, air ducts attached to the tank and discharge pipe, and a material pipe with a device for creating counterpressure inside it, the tool is made in the form of an airtight hopper with a valve in the lower part and a valve installed on it and a valve for adjustment and depressurizing compressed air to atmosphere, the upper part of which is connected to the outlet end of the material conduit.

FIG. 1 shows a device for mixing and supplying concrete mixes; the general view {in FIG. 2 is a fold A-A in FIG. one.

The device contains a hermetic mixing tank 2 installed on the mobile frame 1, in the upper part of which there is a loading hatch 3 with a bolt 4 with a bolt 5. On the bolt 5 there is a safety valve 6 and a valve 7 for communicating the cavity of the tank with the atmosphere. To the top of the tank summed up the air pipe 8 from the compressor, and in its lower part is the discharge pipe 9 connected to the material pipe 10 and the tube 11, which is connected to the air pipe 12 from the compressor. A shaft 14 is mounted inside the tank by means of sub-hinged supports 13, which is connected to the rotational drive 15, on which the blades 16 and the flap valve 17 are fixed.

The device also contains a device for creating a counterpressure in the material pipe, which prevents the possibility of breakthrough of compressed air entering the discharge pipe through portions of the concrete mix, made in the form of a sealed bunker 18 connected by the upper part through the pipe 19 with the outlet end of the specified pipe. The bunker has a volume of at least the volume of the tank and for receiving from it the entire loaded quantity of concrete mix. To clean the bunker after it has been emptied of the remnants of the concrete mix, a hatch 20 with a bolt 21 and a lid 22 and a sealing gasket 23 is provided in it.

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and depressurizing compressed air from it to the atmosphere.

The bunker is equipped with a pressure gauge 26 to control the pressure of compressed air in it, and in the lower part of it above the bottom there is an outlet 27, which is crossed by a clamp 28 of the bolt 29 through a sealing gasket 30. The valve can have both a manual and a mechanized drive, for example, type of pneumatic cylinder. A vibrator 31 is fixed on the bottom mounted in the bin obliquely in the direction of the outlet for better unloading of the concrete mix from it to induce it during unloading. For the convenience of moving the hopper during work, it is equipped with support wheels 32 and a swivel wheel 33.

The device works as follows.

When the hatch 20, the outlet 27, the valve 25 and the pressure of the compressed air adjusted to the pressure of the compressed air corresponding to the backpressure in the pipe 10, depending on its length and density of the concrete mix, are closed, the tank 24 is loaded the mixture through the open hatch 3. Thereafter, compressed air is supplied to the discharge port 9 through the tube 11, which, when filling the cavities of the pipeline 10 and the hopper, goes through the pinhole of the tank 2 into its cavity and open hatch 3 is thrown out

The drive 15 of rotation of the blade shaft 14 is turned on and through the hatch 3 the concrete mix is loaded into the tank 2, the mixer is mixed until a uniform state. At the same time, the air leaving the discharge pipe 9 into the cavity of the tank 2 prevents the formation of a concrete plug in the discharge pipe 9. After the concrete mixture is mixed, the hatch 3 is closed by the cover 5 of the gate 4 and compressed air is supplied to the tank 2 under the pressure of the pressure in the discharge pipe 9, the pipe 10 and the hopper 18. As a result, an overpressure of compressed air is created in the tank 2, at which the concrete mixture is squeezed out

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in the discharge pipe 9. When rotating the blade shaft 14 plate valve 17 closes the outlet of the tank 2, stopping

access of the concrete mixture to the discharge pipe 9, in which it is cut off with compressed air, is supplied through pipe 11. As the blade shaft 14 is further rotated, the flap valve 17 opens the outlet of the tank 2 and a portion of the concrete mix flows into the discharge pipe 9. In the process of rotating the shaft 14 of its blade 16

while mixing the concrete mix, it is moved to the outlet of the tank 2, ensuring that the concrete mix is supplied to the discharge pipe 9 in equal portions. When moving along the pipeline 10 portions of the concrete mixture are tested from the side of its output end, the backpressure created by the excess pressure of compressed air

in the bunker 18 and preventing the breakthrough of compressed air through portions of the concrete mix due to their compaction.

When the device is in operation, the hopper 18 is gradually filled with concrete, and the compressed air that it displaces from the cavity of the hopper 18 and the compressed air coming from the pipeline 10 is thrown out through the valve. pan 24 supporting a constant overpressure inside the hopper 18.

After the whole concrete mix is reloaded from tank 2 into the hopper 18, the supply of compressed air to tank 10 and the discharge pipe 9 is stopped. The drive 15 is turned off; no blade shaft 14. Through:. the cranes 7 and 25 of the cavity of the tank 2 and the hopper 18 are connected with the atmosphere, after which the outlet 27 of the hopper 18 opens and the vibrator 31 is turned on. When vibrated, the concrete mix on the sloping bottom of the hopper 18 is calm

flow without splashing through the outlet 27 to the consumer.

At the end of the delivery of the concrete mix, the device is rinsed by pouring water over the tank 2, turning on the drive 15 for rotating the shaft 14 and forcing it with air

water from tank 2 to hopper 18. At the same time, the internal cavity of tank 2, the blade shaft 14, pipeline 10 and the internal cavity of bunker 18, which after washing, merges from pipe 10 and is transported to the place of contaminated water through the outlet outlet, are cleaned off the opening 27 of the bunker 18. Subsequently, after the connection of the bunker 18 with the pipeline 10 and, if necessary, the relocation of the device to a new object, the order of its operation is repeated.

With this design of the device for mixing and feeding concrete mixes, the possibility of splashing the concrete mix when it is delivered to the consumer is eliminated, thereby improving the operating conditions of the device and improving its performance, and using compressed air therein to create a counterpressure in the material conduit increases reliability. It does not simplify the readjustment of the device when transporting the running of tonne mixtures of different density at different distances.

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Editor N.Vobkova

Compiled by B. Lebedev Tehred M. Gergel

Order 968/34 Circulation 729 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PIP Patent, Uzhgorod, st. Design, 4,

Proofreader O.Lugov

Claims (1)

DEVICE FOR MIXING AND FEEDING CONCRETE MIXTURES, comprising a mixing tank with a loading hatch, an unloading nozzle, a vane shaft with a plate valve, air ducts connected to the tank and the unloading nozzle, and a material pipeline with a device for creating back pressure inside it, characterized in that , in order to improve operating conditions and increase reliability, the device for creating back pressure is made in the form of a sealed hopper with a shutter in the lower part and installed on it with a valve and a valve for adjusting and relieving the pressure of compressed air into the atmosphere, with the upper part of the hopper connected to the output end of the material pipeline. SU> 1216309>