SU815106A1 - Plant for preparing asphalt-concrete mix - Google Patents

Description

one

The invention relates to road construction, in particular, to devices for preparing bitumen-mineral mixtures.

A known device for the preparation of asphalt concrete, comprising a drying and mixing drum with a drive and a firing device, located on the side of the last branch pipe of inert materials, mineral powder and watering bitumen, located on the opposite side of the flue device, branch pipes of the asphalt concrete mixture and exhaust gases and the blade of the drying and mixing drum sections ij.

The disadvantage of this installation is the high temperature of the gas flow (500-1) when drying and mixing inert materials, which leads to a decrease in the quality of bitumen and contamination of the environment by its expired particles, and the enveloping of inert particles with bitumen at the beginning of its heating leads to an increase in the duration of the mixture preparation process and the reduction of the physicomechanical properties of asphalt concrete.

Closest to the present invention is a mixing plant, which includes a rotary drying and mixing drum with paddles of drying and mixing sections, a combustion device, on its side and entering inside the drum inlets of inert materials, mineral powder and bitumen, located on the opposite side sides of the outlet of the finished mixture and exhaust gases, connected to the last chimney with a fan and a drum drive 2.

five

This installation also has a number of disadvantages, the most significant of which are insufficient Heating of the inert material and blowing the mineral powder with a gas stream, which leads to deterioration in the preparation of asphalt concrete mixes and pollution of the environment with waste gases.

five

The purpose of the invention is to improve the quality of the mixture preparation and reduce the dust content of the exhaust gases.

The goal is to achieve that the installation, including the

a rotary mixing drum with blades of the drying and mixing sections, a furnace, located on its side and entering into the drum inlet nozzles of inert materials, mineral powder and bitumen, placed on the opposite side of the outlet nozzle of the finished mix2H and exhaust gases, connected with the latter, a chimney with a fan and a drum drive is equipped with a partition installed in the middle of the drum with an opening and scoops with trays adjacent to it from the side of the combustion device, the ends of which are placed in the opening of the bursting, the blades of the drying section of the drum are installed between its end with the furnace and the end of the bitumen and mineral powder supply nozzles, the end of the nozzle for inert materials is mounted above the furnace, and the nozzles for the bitumen and mineral powder are under it , the latter is located under the bitumen input pipe.

The drawing shows schematically the installation, a longitudinal section.

The installation consists of a drying drum 1, driven in rotation by the drive 2. Baraba 1 has a nozzle 3 of inert Materials, the end of which is located above and in the middle of the combustion device 4, the nozzles 5 and 6 of the input, respectively, of bitumen and mineral powder, located below the furnace 4 and taken out of the place where the inert materials fall into the drum 1, with the bitumen nozzle 5 located above the nozzle 6 for the mineral powder. In the middle part of the drum 1, a partition 7 is placed with an opening near which from the furnace 4 are installed the dies 8 with trays 9 for transferring materials through the opening in the partition 7, in the drying section of the drum 1 in the interval from the furnace to the end of the branch pipes 5 and b are placed the blades 10, in a mixing: compartment along the rest of the drum 1, blades 11 are installed, and at its end there is a nozzle 12 for the finished asphalt-concrete mix and a nozzle 13 for the exhaust gases, which through the fan 14 and smoke 15 communicates with the atmosphere.

The installation works as follows.

The inert materials otozirovanny on fractions and kolchestv continuously through a branch pipe 3 enter the gas stream of the furnace device 4

a passage through which is partially dehydrated and heated. In the drying section of the drum 1 with the paddles 10, the material is mixed and subjected to further drying. Then, also, bitumen and mineral powder dosed are fed continuously through nozzles 5 and 6, which are mixed with inert materials. At the same time bitumen envelops

 particles of mineral material and binds the mineral powder, preventing it from being carried away by Gases. This is achieved especially in the process of transfer of inert materials through the opening in the partition 7, when waste

5, the gases, penetrating through the suspended material, are cleaned from dust particles. The final mixing and heating of the raw materials of the mixture is carried out in the mixing compartment of the drum 1. The ready-mix asphalt concrete passes through the nozzle 12 to the consumer, and the exhaust gases through the nozzle 13 by the fan 14 are sucked into the atmosphere

5 through the chimney 15.

Such an embodiment of the device provides more efficient heating of inert materials, eliminating the reduction of bitumen qualities, which contributes to improving the quality of the mixture preparation and reducing the degree of environmental pollution by dust particles, and also provides the possibility of preparing asphalt concrete mixtures with different composition of inert materials fractions and operating temperature.

Claims (2)

1. US patent 3423222, cl. 106278, 1969. 2.L nrobage and chaud par centrales a tambour s4cheur-ffia1axeur Chat. mag. -monlt. argus, 1977, 80, c. 27-28, France / P hlch S 19 jv 4 s / "Q / IЮ 2 I / / A / v //