SU969735A1 - Rotary feeder for feeding granular materials - Google Patents

Description

(54) ROTARY FEEDER TO SUPPLY BULK

one

The invention relates to ferrous metallurgy, in particular, to devices for feeding pulverized coal into a blast furnace hearth.

Closest to the proposed technical entity is a rotary feeder for feeding bulk materials, containing a sectional rotor housed in a housing, in the lower part of which mixing chambers with nozzles are installed. When the rotor rotates, the bulk material from the cells of each section enters the appropriate mixing chamber, from where it is supplied to the dust ducts with compressed carrier air. This feeder allows, by varying the rotor speed, to simultaneously control the flow rate of the material beam per group of blast furnace tuyeres with a satisfactory uniformity of distribution between the individual tuyeres 1.

The disadvantage of this feeder is the inability to autonomously shut off the supply of bulk material for each dust pipe separately. Applicable method for shutting down individual MATERIAL dust pipe

by overlapping the cork valve of our entrance leads to the rapid compression of the bulk material in the appropriate mixing chamber, which further, if necessary, start this dust pipe, creates significant difficulties caused by the need to clean the material and purge the mixing chamber.

The purpose of the invention is to increase the reliability of operation of the feeder by providing autonomous shutdown of mixing chambers.

The goal is achieved by the fact that a rotary feeder for feeding bulk materials, containing a hollow rotor placed in a housing, in the lower part of which mixing chambers with nozzles are installed, is equipped with a pneumatic cylinder, on the output shaft of which is mounted a shtanga with free-standing brushes with transverse nozzles which, through seals, are inserted into the cavities of the mixing chambers, while the rods at the installation site on the shtange are provided with latches and locking elements in the form of plates in contact with them, nennyh longitudinal sectional shape of the cavity of the mixing chamber.

FIG. 1 shows a rotary feeder, longitudinal section; in fig. 2 - the same, cross section; in fig. 3 shows section A-A in FIG. 2

The feeder is equipped with a rotor 1, which is divided by partitions 2 into sections. Each section, in turn, is divided into cells. The rotor with a certain gap is placed in the housing 3, closed at the ends by covers 4, in which seals 5 are mounted, and bearings 6.

Through the nozzles 7, a compressed carrier gas is supplied to the ends of the rotor, which, passing through the slots in the rings 8, prevents the transported material from entering the seal and the bearings.

The lower part of the body with the aid of partitions 9 is divided into separate compartments 10, the number of which is equal to the number of rotor sections. Mixing chambers 11 with nozzles 12 are connected to the lower part of the body. Inlet tubes 13 can move along their axis, ensuring the necessary position of the nozzles. The number of nozzles 12 is equal to the number of rotor sections.

In each compartment of the lower part of the feeder housing, a locking element is fastened, for example, a flexible plate 14, rigidly or hinged, which, if necessary, overlaps the mixing chamber by acting on the rod 15 of the pneumatic cylinder 16. Each rod moves in the gland seal 17 and attaches to the rod of the pneumatic cylinder with lock 18 The transverse nozzles 19 rigidly mounted on the cones of the rods 15 placed in the mixing chambers have 0.5-0.9 times the transverse size of the mixing chambers.

The feeder operates as follows.

If necessary, turn off the flow of bulk material on any of the dust ducts, a signal is triggered to trigger the pne: cylinder 16, along which the moving rods 15, acting on the transverse nozzles 19, cover all the compartments of the rotary feeder. Then, one retainer 18 is removed, connecting a clip

section to the pneumatic cylinder 16, and a signal is given to return the pneumatic cylinder to its original position, after which the section to be cut remains closed and all the others reopen. If it is necessary to resume the flow of bulk material through the blocked dust pipe, it is necessary to turn on the pneumatic cylinder 16, then reinstall the clamp 18 and return the pneumatic cylinder to its original position.

The use of the invention improves the reliability of the feeder and allows you to automate the operation of switching on and off individual dust ducts. The use of the proposed device will allow to achieve additional savings in the amount of about 50.0 thousand rubles. per year per blast furnace at the expense of a more even and forced course of the furnace, leading to a decrease in the specific consumption of coke and an increase in production.

Claims (1)

Invention Formula A rotary feeder for feeding bulk materials containing a sectional rotor, housed in a housing, in the lower part of which mixing chambers with nozzles are installed, characterized in that, in order to increase the operation of the feeder by providing an independent shutdown of the mixing chambers, the rotary feeder is equipped with a pneumatic cylinder, on the output shaft of which a bar is fixed with brushes freely installed in it with transverse nozzles that are inserted through the seals into the mixing cavities 5 chambers, while the rods at the place of installation on the rod are provided with clamps and locking elements in contact with them in the form of plates made in the form of a longitudinal section of the cavity of the mixing chambers. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 195478, cl. From 21 to 5/00, 1968.