SU917034A1 - Device for taking measured samples of pulp - Google Patents

Description

(54) DEVICE FOR THE SELECTION OF DOSED PULSE TESTS

one

The invention relates to devices for sampling liquids and suspensions from containers and can be used in the chemical and food industries, as well as in gold extraction factories for sampling pulp samples from process tanks to determine the concentration of ion exchange resin in the pulp or other purposes.

A device for sampling liquids and suspensions is known, comprising a housing having, in the upper part, a filling valve with a brush, a diaphragm interacting with the brush, and a flexible air duct 1.

The disadvantage of the device is the low representativeness of the sample.

Closest to the proposed technical entity is a device for sampling pulp samples, including a housing with spring-loaded filling and draining valves on a common Ctoke 2.

The drawbacks of the device are the inconvenience of its removal from the process tank to the outside and samples from the devices itself, and consequently the inexpediency of its use in automated

system of analytical control of liquid media.

When taking a sample from the process tank, in which the level of the medium to be withdrawn varies over time, rigidly fixing the valves relative to each other on the common stem does not provide a constant dose of the sample, since opening the filling valve opens one, j. temporarily, and a drain valve, opening access to the sample to the drain line, which is filled according to the law of communicating vessels. And since the level of the medium selected in the process tank varies, the level in the drain line, i.e.

15, each time a sample is taken, the dose is changed, which is a drawback of the device. The purpose of the invention is to improve the dosing accuracy and representativeness of the sample.

This goal is achieved by the fact that the device containing a housing with spring-loaded filling and draining valves on a common stem is equipped with a pneumocamera with a diaphragm and spring mounted on the stem, and the housing is equipped with a compressed air supply nozzle with an elastic valve and a sample outlet fitting installed after the drain valve while the filling valve is fixed on the rod, and the drain valve is mounted for movement.

The drawing shows the device, a longitudinal section.

The device consists of a cylindrical body 1, a lid 2 and a pneumatic chamber 3 of one-way action, which is coaxially mounted on the body 1 by means of columns 4.

The pneumatic chamber 3 contains a nozzle 5 for supplying compressed air, a membrane 6, a stem 7 and a return spring 8. On the stem 7, there is a fixed E-filling valve and a drain valve 10 with a spring 11 are mounted on the stem 7 and are located on the outer side of the housing 1 equipped with a socket 12 compressed air supply with an elastic valve 13 and a sample outlet nozzle 14 installed after the drain valve.

The device works as follows.

The device immersed in the process tank is subject to the static pressure of the column of controlled pulp.

In the initial position, the filling valve 9 and the drain valve 10 are closed.

To take a dose of the sample, through the nozzle 5B, the lower cavity of the pneumatic chamber 3 is supplied with compressed air, iTol compressed air pressure membrane G, compressing the spring 8, moves the rod 7 with the filling valve 9 upwards, opening the sample of the pulp into the cavity of the housing 1.

When the stem 7 is moved upward, the spring 11 is compressed, additionally pressing the drain valve 10 in order to seal. When filling the cavity of the housing 1, the elastic valve 13 prevents the pulp from entering the pipe 12.

After the cavity of the housing 1 is filled, the pulp sample, the dose of which is determined by volume Oi, compressed air supply to the lower cavity of the pneumatic chamber 3 is stopped and the spring 8 returns the rod 7 with the filling valve 9 to its original position, the sample dose compartment.

In order to force the sample out through the pipe 12, compressed air is supplied to the cavity of the housing 1. Under pressure of compressed air, the drain valve 10, compressing the spring 11, moves down the stem 7, opening the outlet of the sample, which is forced through the drain pipe 14 to the outside.

After the sample has been displaced, water is supplied through the nozzle 12 to flush the cavity of the housing 1 and the entire drain line. At the end of the flush, the water supply is stopped, and the one that remains in the device is forced out of the pressure of compressed air to the outside.

After the water is displaced, the compressed air supply is stopped and the spring 11 closes the drain valve 10.

This cycle of operation of the device ends.

Technical and economic advantages are due to the fact that the design of the device permits an increase in the metering accuracy and representativeness of samples due to the fact that when filling the cavity of the body of a breakdown, the drain valve and the elastic valve of nozzle 12 prevent the slurry from entering the nozzles of the drain and compressed air supply is determined by the capacity of the body and does not depend on the level of the pulp in the process tank.

The device makes it possible to use it as an integral part of the complex of technical means of an automated system for analytical control of liquid media.

Claims (2)

1. USSR Author's Certificate No. 381950, cl. G 01 N 1/10, 1971. 2. USSR author's certificate number 310153, cl. G 01 N 1/10, 1970.