RU2433857C1 - Plant for preparation of loose and viscous loose mixes - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to chemical industry and is intended for production of construction materials. Proposed plant comprises driven conveyor, loose components feeders arranged alternating along said conveyor, fluid component sprayers, mixing assembly and mix discharge bin. Mixing assembly is made up of two stages including parallel rotors with intersecting elastic beaters. Note here that first stage is mounted behind components feeders while second stage is arranged between conveyor and mix discharge bin.

EFFECT: higher mixing efficiency in processing adhesion-prone materials.

1 dwg

Description

The invention is intended for use in the chemical industry, agriculture, the production of building materials and several other industries. The unit is most effective when used in the production of asphalt mixtures.

Known mixer [RF Patent 2203727, publ. 03/10/03, bull. No. 13], comprising a device for feeding loose components, a mixing unit made in the form of two stages, each having two drums with flexible mixing elements that are installed in the housing on the base, and mixture discharge pipes. The axes of the drums are rotated relative to each other by 90 °. The components from the dispensers enter the mixing unit, where they are actively mixed with two drums with flexible mixing elements rotating in opposite directions with different angular velocities.

The disadvantages of this mixer include the relatively low quality of mixing due to the lack of a stage of preliminary layer-by-layer application of components, as well as the inability to use it for the preparation of viscous bulk mixtures due to overgrowing of working elements with materials prone to adhesion.

A device for mixing bulk materials is known [RF Patent No. 2135052, publ. 08/27/99, bull. No. 24], containing a drive conveyor, alternately installed along it the device for feeding bulk components, a mixing unit with flexible mixing elements and nozzles for unloading the mixture. The conveyor belt of the device is equipped with transverse elastic ribs. Behind the dispensers, a drive roller is installed to destroy the packed pieces of bulk material. At the outlet of the dispenser there is a plate for smoothing the surface of bulk material.

The components to be mixed from the dispensers are fed to the drive conveyor and laid out in layers on the tape. When the components pass under the mixing unit with flexible mixing elements, the layers located in the cells between the ribs are shuffled and additional mixing occurs due to the transfer of particles between the cells.

The disadvantages of this device include a relatively low efficiency due to the low rate of exchange (mixing) of the particles of the components in the direction perpendicular to the direction of movement of the tape, and due to the overgrowth of the working elements with materials prone to adhesion. This device, like the previous one, cannot be used to obtain viscous bulk mixtures.

Closest to the proposed invention is a mixer of bulk materials [Patent No. 2378041, publ. 01/10/10, bull. No. 1], comprising a drive conveyor, alternately mounted devices for feeding bulk solids and nozzles for spraying the liquid component, a mixing unit with flexible mixing elements, a hopper for unloading the mixture.

Bulk material using a feeder in a thin layer is distributed on the moving surface of the conveyor. Then particles of the hot liquid component are sprayed onto the surface of the granular layer with the nozzle. After this, the resulting mixture is subjected to additional exposure to the screws and unloaded.

The disadvantages of such a mixer include the relatively low quality of mixing due to fluctuations in the concentration of the component, taken as the key, in the direction perpendicular to the direction of movement of the tape. This is due to the mismatch in this direction of the mass distributions of the sprayed liquid particles and the layered dosed particles of the granular component. The effectiveness of the mixer is also reduced due to the sticking of a material prone to adhesion on the working bodies (screws).

The objective of the invention is the creation of an aggregate for the preparation of bulk and viscous bulk mixtures, providing high mixing efficiency and the possibility of processing materials prone to adhesion.

The solution to this problem is achieved by the fact that in the unit for the preparation of granular and viscous granular mixtures containing a drive conveyor with a belt, alternately installed along the device for feeding granular components and nozzles for spraying a liquid component, a mixing unit with flexible mixing elements, a hopper for unloading the mixture, a mixing unit made in the form of two stages, including parallel rotors with intersecting elastic beams, and the first stage is installed behind the component feeders, and the second is between the conveyor and the hopper for unloading the mixture.

The drawing shows a diagram of the unit for the preparation of bulk and viscous bulk mixtures.

The unit for the preparation of granular and viscous granular mixtures consists of a drive belt conveyor 1, alternately installed along it feed devices for granular components 2, 3 and nozzle 4 for spraying the liquid component, the mixing unit in the form of two stages 5 and 6, each of which includes parallel rotors with intersecting elastic beaters. The feeding device 2 and 3, the nozzle 4 and the stage 5 of the mixing unit are located in the insulating casing 7. At the outlet of the conveyor belt 1, a guiding device 8 is installed, and behind the second stage 6 of the mixing unit there is a hopper for unloading the mixture 9.

The unit for the preparation of bulk and viscous bulk mixtures works as follows.

Bulk material is uniformly fed to the working belt of the drive conveyor 1 by the device 2 in the form of a thin layer. During the passage of this layer under the atomizer, made in the form of a nozzle 4, particles of the heated component are sprayed onto its surface. Then, a third layer of bulk materials, previously mixed in the first stage 5 of the mixing unit, is applied to the surface of the heated particles of the liquid component. When moving along the tape, the particles of the liquid component cool and solidify. Further, components having a three-layer structure, with the help of the guiding device 8 are fed to the second stage 6 of the mixing unit, from where the finished mixture enters the discharge hopper 9.

The efficiency of mixing the components in the unit is ensured by the fact that for supplying both liquid and granular components, atomizers are used: nozzles and rotors with elastic working elements, respectively. Particle mass distributions both at the outlet of the nozzle 4 (liquid phase) and at the outlet of the first stage 5 of the mixing unit are similar and correspond to the normal law. Due to this, when layers are applied, the particle concentration of the key component is equalized in the direction transverse to the tape. There is no need to use additional mixing devices to even out particle concentrations.

In addition, the particles of the liquid heated component are between the layers of granular material, which envelops them and further prevents sticking to the working elements of the rotors of the second stage 6 of the mixing unit.

The quality of the viscous bulk mixture is also ensured by the presence of the first stage 5 of the preliminary preparation of bulk components. This eliminates the need to use for these purposes an additional mixer for the preparation of a homogeneous bulk mixture.

Claims (1)

An aggregate for the preparation of bulk and viscous bulk mixtures, comprising a drive conveyor, alternately mounted devices for feeding bulk components and nozzles for spraying a liquid component, a mixing unit with flexible mixing elements, a hopper for unloading the mixture, characterized in that the mixing unit is made in two stages, including parallel rotors with intersecting elastic beams, the first stage being installed behind the component feeders, and the second between the conveyor and the hopper unloading the mixture.

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