SU1255868A1 - Weigher for powder materials - Google Patents

Abstract

The invention makes it possible to increase the metering accuracy by reducing the spillage of the material. The device contains a feed bunker with a feeder 2 and a pyramidal weight bunker Z. Two. Two opposite walls of the outlet pipe 6 and the sides of the butterfly valve 4 contacting are V-shaped with a certain angle at the apex. When issuing a material dose collected in the hopper 3, the flap 4 takes up a vertical position. The elastic elements 5 of the valve interact with the inner walls of the pipe 6. only in the closed position, tightly covering the outlet of the hopper 3. The valve 4 is rotated by a pneumatic cylinder drive. Bunker 3 is suspended on lifting levers 7 connected to a dial indicator 8. 4 Il. i SL ND SL SP 00 O) 00

Description

.

This invention relates to devices for dispensing powdered mapps,

The aim of the invention is to improve the dosing accuracy by reducing the spilling of the material.

FIG. 2 is a general scheme of the powder dispenser of FIG. 2 - diagram of the operation of the dispenser in the closed position of the valve; in fig. 3 is a diagram of the operation of the dispenser when the flap is open; in fig. 4 is a section A-A in FIG. 3

The dispenser contains a power supply device that includes a feed hopper 1, a feeder 2, for example a drum type, and a pyramidal weight hopper 3 equipped with a rotary valve 4 with elastic sealing elements 5 installed in the outlet nozzle 6,

The weight bin 3 is suspended on the load-receiving levers 7 connected to the dial indicator 8.

The outlet pipe 6 has a rectangular cross-section and is made with walls 9-12, of which walls 9 and 10, intersected by the drive shaft 13 of the valve 4, have a V-shape. The sides a and S of the valves 4 which are in contact with the walls 9 and 10 are also V-shaped with an angle y at the apex defined from

conditions

where is oL

arc

ctg (sinoi-ctg -: r-).

the angle of inclination of the shutter 4 to the horizon in the closed position; p is the angle when the horngun is V-shaped

walls 9 and 10.

This dependence is obtained by calculation.

When choosing an angular and p different from the indicated values, negative phenomena occur:

at an angle of about. : 1 5 there is a danger of jamming the valve;

at an angle of "45, the dimensions of the flap 4 of the outlet nozzle 6 and, correspondingly, of the entire metering device, are unjustified;

at an angle of p g; 1-20, the outflow of material from the weighing bin 3 is worsened due to the reduction in the size of the aperture and the location of the V-shaped walls and the outflow pipe at an angle to the horizon, which is less than the angle of natural slope to

0

5 o

five

0

five

0

five

powdered material;

when the angle r 140 increases the wear rate of the elastic elements 5.

The dispenser works as follows.

The feed of the metered powdery material from the feed bin I to the weigh bin 3 is carried out by the feeder 2. The dose is put into the weigh bin 3 at the closed position of the rotary valve 4. At this point, the shutter 4 is set at an angle to the horizon, tightly pressed against the walls 9-12 of the discharge pipe 6 and tightly covers the outlet of the hopper 3 by means of elastic elements 5. Groove. Lifting levers 7 transfer the load to the dial indicator 8. After the dose has been set, the feeder 2 stops feeding the material into the hopper 3. If it is necessary to deliver the dialed dose, the roller 4 turns and takes up the vertical position, the material is poured out of the hopper 3 through the outlet 6, valve operation control 4 is driven by a pneumatic cylinder 14. The elastic elements 5 of the valve 4 interact with the inner surface of the walls 9-12 of the nozzle 6 only in the closed position. In the open and in any intermediate. The nominal positions of the elastic elements 5 of the flap 4 do not touch the walls 9-12. Moreover, the gap between them and the edge of the flap 4 progressively decreases from the maximum in the open position to zero in the closed position.

As in the proposed metering device, the elastic elements 5 do not permanently adjoin the walls of the nozzle 6, their wear will be insignificant.

Formula of invention.

A powder dispenser containing a feeding device and a weighing bin provided in the outlet nozzle fixed on the drive shaft with a rotary valve with elastic sealing elements, characterized in that, in order to improve the metering accuracy, two opposite one other walls of the outlet nozzle and contact with them; side rotary valve

V-shaped, the axis of the drive shaft passes through the tops of the V-abrasive sides of the rotary valve, and the angle at the tip of the V-shaped side is determined from the ratio g If 2 arcctg (sin ot-ctg),

ot is the angle of inclination of the valve to the horizon, selected from a range of 15-45;

p is the angle at the apex of the V-shaped walls of the outlet nozzle, selected from a range of 120-140 °.

/ - /

Editor B, Ivanova

Compiled by A. Pronin

Tehred L. Serdyukova Proofreading. Demchik

Order 4809/40 Circulation 705 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG A

Claims (1)

Claim. A powder material dispenser comprising a feeding device and a weighing hopper equipped with a rotary valve with elastic sealing elements fixed to the drive shaft in the exhaust nozzle, characterized in that, in order to increase the metering accuracy, the two walls of the outlet nozzle opposite each other and the rotary sides in contact with them the shutters are made V-shaped, while the axis of the drive shaft passes through the vertices of the V-shaped sides of the rotary shutter, and the angle at the top of the V-shaped side is determined The relationships of the wish to set up 5 sheniya _β f = 2 arcctg (sin d.-ctg wherein οί - damper tilt angle to the horizon selected in the range of 15-45; p is the angle at the top of the V-shaped walls of the exhaust pipe, selected from the range of 120 140 °,