RU1793239C - Weighing drum - Google Patents

Abstract

Usage: piecewise formation of a flow of granular material. A receiving tray 2 is located inside the perforated storage drum 1. Due to the vacuum in the box 3, particles are captured by the perforations of the storage drum 1. The box 3 covers the storage drum 1 from the bottom to the near edge of the receiving tray 2. Above the particle tray 2, the particles weights are falling. 1 ill.

Description

The invention relates to the metering of granular materials and can be applied in the chemical, food, pharmaceutical and other industries.

A known design of a drum feeder-dispenser for supplying powder, fine-grained and lumpy materials.

The granular material entering the feed funnel alternately fills the individual sectors. A disadvantage of this design is the crushing of the product at each dose restriction site.

This drawback has been eliminated in the design of the drum dispenser, which consists of a storage drum, in which the receiving part of the tray is located, around which there are blades fixed on the inner surface of the storage drum.

. The material to be dosed is captured by the blades of the rotating drum, rises and is poured from the blades into the receiving part of the tray.

A disadvantage of such a dispenser is its low metering accuracy, especially at low capacities. ; The purpose of the invention is to increase the accuracy of dispensing even one-piece formation of the flow of the dosed material.

This goal is achieved by the fact that in the drum dispenser containing the rotary drum mounted in which the receiving part of the tray is located, the storage drum is perforated and provided with a box covering it from the bottom of the storage drum to the near edge of the receiving part and tray in the direction of rotation, and the box is equipped with an air suction fitting. The size of the perforation holes is smaller than the minimum grain size of the used material.

Compared with the prototype, the proposed device provides higher metering accuracy, since in the prototype the accuracy depends on the portion size, i.e. the amount of material on the blades at the time of pouring from it into the receiving part of the tray, and is random in nature depending on the structure of the package. In the proposed device; Improving the metering accuracy is ensured by the constant number of particles entering the receiving part of the tray per unit time.

When analyzing known technical solutions, no solutions were found that have

th

features similar to the set of distinctive features of the proposed device.

The drawing shows a diagram of a drum 5 dispenser, section.

The drum dispenser consists of a perforated storage drum 1, tray 2, the receiving part of which is located in the storage drum, box 3, forming

connecting the vacuum chamber with the outer surface of the storage drum 1, the Box 3 is equipped with a suction nozzle 5 of the air, to which a vacuum pump is connected (not shown).

15 The device operates as follows. By turning on the drive 4, the storage drum 1 is rotated and the granular material is agitated. In the presence of air suction

20 through the nozzle 5 in the box 3, a rarefaction is formed that holds individual grains of material on the inner surface of the storage drum 1 opposite the holes in the coverage area of the box 3. When

25, when the upper edge of the box 3 is reached, the discharge action ceases, and the grain, under the action of gravity, breaks away from the inner surface of the storage drum 1 and the receiving part of the tray 2 falls.

30 and then outputted from the device.

The adjoining of the box to the outer surface of the storage drum on an arc starting at its lower point provides grain grabbing with minimal material loading. The size of the perforation holes should be taken smaller than the minimum grain size to prevent granular material from entering the box. The tight connection of the box with the outer surface of the storage drum is provided by a seal, which is preferably made of antifriction material. The rotation speed of the storage drum and has an upper limit: critical

45 the speed at which the granular material is pressed against the inner surface of the drum-accumulator due to the centrifugal force. The performance of the dispenser is controlled by changing the number of revolutions of the drum or the number of holes.

An additional advantage of the proposed device is the ease of maintenance, since the termination of supply of granular material can be achieved by turning off the vacuum pump, and in the prototype, by stopping the rotation of the storage drum.

51793239 .... 6

Claims (1)

The claims to provide for the piecewise formation of a flow of granular material, it introduced Drum dispenser for granular ma-equipped with a suction nozzle for coteriel air, containing installed with the bin, covering the drum-drive the possibility of rotation of the drum-drive, from its lower point to the near edge ; in which the receiving part of the tray, the receiving tray is placed in the direction of rotation of the bar, and so that, with the aim of a storage drive, which is made to increase the accuracy of dosing due to counterfoils.