RU78442U1 - DEVICE FOR CUTTING AND DRYING OF Sawdust - Google Patents

Abstract

The device for grinding and drying sawdust consists of an activation chamber, in the lower part of which a rotor with grinding hammers rotates on a horizontal shaft. The lower part of the rotor is enclosed by a wall with pins mounted on it. The rotor is made in the form of a hollow drum. The upper part of the rotor is limited by a slotted separator from cantilever plates. A centrifugal classifier is installed in the upper part of the activation chamber, which closes the channel for unloading dry sawdust, and the channel for supplying hot air and the channel for supplying wet sawdust are connected to a common channel for supplying the mixture.

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 industries, more specifically for their grinding and drying.

There are devices for grinding waste from woodworking industries, for example, hammer, high-speed crushers of the Astek group of companies (St. Petersburg), which are a case with a rotor mounted on a horizontal shaft and equipped with grinding hammers on the periphery. The lower part of the rotor is closed by a mesh separator. Sawdust coming from above is crushed by the hammers of a rotating rotor and centrifugal force is thrown to the separator. Sawdust of the required size passes through the holes of the separator, the rest continue to be crushed. Such devices are productive, simple, but not suitable for drying products and classifying them by moisture.

There are also devices for grinding and drying sawdust, for example, the device of the English company ATRITOR, where two drums are coaxially mounted in the common case, equipped with rows of pins around the perimeters of the working area. Hot air and moist sawdust are fed into the inter-pin space. In the opposite direction of rotation of the drums, sawdust, activated by compressed, hot air, is ground with pins and dried. 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 device for grinding and drying wood sawdust can be considered the device according to the patent of the Russian Federation No. 66232 "Device for drying and grinding sawdust". In the specified device, wet sawdust is loaded from above onto a rotating horizontal rotor, with hammers installed on the periphery (not shown in the drawing).

Wet sawdust by centrifugal force is thrown to the periphery of the rotor, where it is crushed with hammers. The hot air supplied to the grinding zone agitates and dries the sawdust, a classifier installed coaxially to the rotor selects the sawdust of the required condition, and the rest returns to re-crushing by centrifugal air flow. Such a device is simple, but not productive, due to the small amount of sawdust crushing core.

The purpose of the proposed utility model is to eliminate this drawback. This goal is achieved by the fact that the grinding rotor is made in the form of a hollow drum with hammers, the lower part of which is enclosed by a wall concentric with the rotor and equipped with pins, and its upper part is closed by a separator made in the form of a set of mutually parallel plates concentric with the rotor. The hot air supply channel is combined with the sawdust supply channel and is directed tangentially to the rotor in the area of the pin space.

The device is illustrated by the attached drawing. In Fig 1 shows a General view of the device in section, in Fig 2 is a side view. The device consists of a housing 1, inside which a grinding rotor 2 is installed, with hammers 3 and a separating wall 4, a wall 5 with pins 6, a slot separator consisting of plates 7, a feed channel for wet sawdust 8, with a feed device 9, a channel for supplying hot air 10, the dynamic classifier 11, with the drive 12, the drive of the rotor 13 and the discharge channel 14.

The device operates as follows; in the feed channel 8, through the feeder 9 come wet sawdust. At the same time, hot air is supplied through channel 10. Wet sawdust in channel 8 is mixed with hot air and tangentially fed into the active processing zone of the mixture — pin space. The rotor 2 is continuously rotated by the drive 13 and with the work hammers 3 crushes and dries the sawdust, breaking the mixture into many streams.

The crushing and drying process is activated by fixed pins 6 in a limited processing space between walls 5 and 4. With further movement, the processed mixture is directed to a separator consisting of cantilever plates 7. The slots between the separator plates are designed to pass a certain size of sawdust. The sawdust of the right size under the action of centrifugal force fly through the slots of the separator into the zone of the classifier 11, where the final separation takes place: small dry sawdust is sent to the discharge channel 14, and large wet sawdust is returned for reprocessing. The drive of the classifier 12 has a variable speed, which allows you to configure the device to receive dry sawdust of the required condition. This embodiment of the device is effective, due to the reduction of the path of active processing of sawdust. Already in the feed channel, wet sawdust mixed with hot air softens and is thus easier to crush in a limited pin space, which contributes to the intensity of the process, and the separator from cantilever plates is constantly cleaned by a centrifugal air stream.

Claims (1)

A device for grinding and drying sawdust, comprising a housing, a grinding rotor, a separator, a feed channel for wet sawdust, a channel for supplying hot air, a centrifugal classifier and a discharge channel, characterized in that, for performance, the grinding rotor is made in the form of a vertically mounted hollow drum with hammers, the lower part of which is fenced with a wall concentric to the rotor, equipped with pins, and its upper part is closed by a separator made in the form of a set of mutually parallel concentric to the rotor plates, the hot air supply channel is combined with the sawdust supply channel and directed tangentially to the rotor in the area of the pin space.