RU77561U1 - DEVICE FOR CUTTING AND DRYING OF Sawdust - Google Patents

Abstract

A device for grinding and drying wood sawdust consists of an activation chamber with a drive disk - activator, for mixing and grinding raw materials, a pneumatic channel system for supplying and removing a drying agent - compressed hot air, raw materials, finished products, secondary products, and a classifier installed at the inlet channel unloading shredded dry sawdust. A flow separator is installed coaxially with the classifier in the activation chamber in the form of an inverted truncated cone, the outer surface of which is equipped with blades inclined to the axial line, and elastic reflectors are installed on the wall of the activation chamber in the plane of the activator, and hot air is supplied through the bottom of the activation chamber, equipped with openings.

Description

The utility model relates to the field of technology for the production of wood processing products, and more specifically for the production of fuel pellets from waste wood processing plants, more specifically for their grinding and drying.

There are devices for grinding wood sawdust, for example, a device of the company BUHLER, which is a vertically arranged centrifugal hammer mill, in which a disk with hammers installed along the edge and fenced with a mesh with holes of a given size is mounted on the motor shaft. Sawdust arrives at the activator’s rotating ditch and is discarded by centrifugal force to the peripheral zone, where it is ground with working hammers and penetrate through the holes of the mesh. Such a device does not select light, non-inertial filings and does not dry products.

There are devices for grinding and drying wood sawdust, for example, the device of the English company ATRITOR, which is arranged as follows; two drums are coaxially mounted in the common housing, provided along the perimeters of the working area with rows of pins installed with minimal gaps between the mating rows. Hot air and moist raw materials - sawdust - are fed into the intercenter space. In the western direction of rotation of the drums, the raw material activated by hot compressed air enters the interdigital space, is crushed and dried. Unbound moisture is discharged to the outside by air flow, and crushed and dried sawdust is pushed overpressure together with cooled air into the inactive zone of the device - channel

unloading and pneumatic transport are sent to the product storage. Such a device is complex, expensive and not productive due to the non-selectivity of processing the flow of raw materials.

The closest in technical essence devices for grinding and drying sawdust can be considered devices according to the patent. No. 66232

"Device for drying and grinding sawdust", which is an activation chamber with an activator in the form of a rotating disk. Wet sawdust is fed to the disk, which is centrifugally discharged to the peripheral zone into which hot air is simultaneously supplied.

 Wet sawdust, mixed with hot air, and colliding with activator hammers (not shown in the drawing) are crushed due to friction and crushing of colliding wood particles. In the upper part of the chamber, coaxial to the activator, a classifier is installed, which passes only small, predetermined fractions of sawdust into the discharge channel.

This device has a significant drawback: wet sawdust is poorly reflected from the chamber wall in the grinding zone by the activator, stick. Heavy and wet sawdust accumulate in the stagnant area under the activator disk. Wet sawdust goes directly to the activator disk without being subjected to preliminary crushing into streams. All this reduces the efficiency of the device.

The purpose of this utility model is to eliminate this drawback. This goal is achieved by the fact that for the purpose of productivity, the device is equipped with a flow separator installed below and coaxially to the classifier, made in the form of an inverted hollow truncated cone, the side wall of which is equipped with blades inclined to the axial line. The peripheral part of the activation chamber in the plane of the activator

closed by elastic reflectors, the podactivator space of the latter is separated by a partition with holes and provided with a channel for supplying hot air.

 The device is illustrated by the attached drawing. Figure 1 shows a General view of the device. Figure 2 is a view along arrow A of the elastic reflectors of sawdust.

A device from a bed 1, with an activation chamber 2 mounted on it, with an activator 3 equipped with grinding hammers 4, an activator drive 5, wet sawdust device 6, on a loading channel 7, a classifier 8 with a drive 9, an unloading channel 10, a flow separator 11, with inclined blades 12, elastic reflectors 13, dividing wall 14 and rocked the supply of hot air 15.

The device operates as follows: in the activation chamber 2 mounted on the bed 1 with an activator 3, equipped with grinding hammers 4 and connected to the drive 5, wet sawdust comes from the wet sawdust feeder 6 through the loading channel. The classifier 8, receiving rotation from the drive 9, deflects the heavy (wet) sawdust to the walls of the activation chamber 2, where they, colliding with the upward flows of sawdust and hot air from the activator 3 and repeatedly reflected from the inclined blades 12, are crushed and dried for subsequent contact with discharge channel 10. Heavy wet sawdust glide along the hot inclined wall of the flow separator 11, while part of the dried sawdust is also deflected by the oncoming flow from the rotating activator 3 into the area of the inclined blades 12, where they are crushed drying and drying. Heavy wet sawdust, getting on the activator disk 3, is reflected by centrifugal force into the area of the grinding hammers 4, on the elastic reflectors 13,

which, by vibrating, prevent the buildup of sawdust on the walls of the activation chamber and create additional vortex flows. The podaktivatorny space is separated from the activation chamber by an additional wall 14, equipped with holes, and connected to the channel for supplying hot air 15. The injected hot air prevents the accumulation of sawdust under the activator and creates vortex flows simultaneously throughout the grinding zone, dries and moves the sawdust to the impact zone of the grinding hammers 4 onwards to the classifier.

Claims (1)

A device for grinding and drying sawdust, including a bed, an activation chamber with an activator, a hot air supply channel, a wet sawdust loading channel, a centrifugal classifier, an unloading channel and a drive, characterized in that, for the purpose of performance, it is equipped with a separator installed below and coaxially of the classifier flows, made in the form of a hollow truncated cone, the outer wall of which is equipped with blades inclined to the axial line, the peripheral part of the activation chamber in the plane of the activator is closed with elastic spacers, and the podactivator space of the latter is separated by a partition with holes and provided with a channel for supplying hot air.