SU1161841A1 - Automatic sampling system - Google Patents

Abstract

1. SYSTEM OF AUTOMATIC SELECTION OF SAMPLES, containing a sampler, about 4-day capacity, a sample accumulator dispenser connected by a transport pipeline to a switching device, can be connected to the analyzer and to the sewers, the pulp decontamination unit and the control unit are So that, in order to increase the representativeness of the sample by eliminating the influence of the remnants of the previous sample and automating the process, the switchboard device is made in a water overflow dispenser equipped with a source The washing water dehydration unit is made in the form of a centrifuge with a multisection rotor installed between the dosing dispenser and the analyzer. . The system is in accordance with claim 1, so that the bottom of the rotor (made with an inclination less than the angle of natural repose of the solid phase. eo 4

Description

one

The invention relates to the technique of automatic sampling of suspensions from reaction apparatus with a slight excess pressure of 0.05-0.1 MPa, their filtration and sample feeding into automated automatic analyzers and can be used, for example, in food, chemical, pulp and paper and other industries to ensure the normal operation of photocolorimeters, conductometers, pH-meters, etc.

The purpose of the invention is to increase the quality of the sample by eliminating the influence of residuals of the previous sample and automation of the process,

FIG. 1 shows the proposed automatic sampling system; in fig. 2 - centrifuge, general view.

The automatic sampling system contains a tank 1 for the product under investigation, a sampler 2, an end surface that is made in the form of a filter 3, knives 4 installed inside the sampler and equipped with an electric motor 5, intermediate tank 6, a sample accumulator 7, equipped with a warning lamp 8, a float 9 and a crane 10 with an engine 11 connecting the dispenser with an atmosphere or a source of compressed air, the accumulation dispenser 7 being connected to the overflow dispenser 12, which is connected to the sewage through the valve 13, and 14 with the engine 15 is connected to the fixed pipe 16 of the rotor of the centrifuge 17; an electric motor 18, a centrifuge rotor drive 19; collection 20, the output of which is a stationary discharge discharge pipe 21 connected to the discharge valve 22 with a drive 23. The volume of the overflow dispenser 12 is 5 times less than the volume of the dispenser 7 and does not exceed the total volume of the rotor sections of the centrifuge 19.

Pa figs. 2 depicts a centrifuge rotor 19 divided into sections by partitions 24, a fixed nozzle 16 of a centrifuge rotor, an inclined bottom 25, a collection 26 a fixed nozzle 21 unloading, an electric motor 18 - a centrifuge rotor 19.

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The device works as follows.

The sequence of all operations (turn on and turn off

electric motors, rotating. cranes, and electric motors, rotary knives and centrifuge rotor 19) are implemented by a software control unit (not shown).

In the initial state, the inlet filter 3 of the sampler is clogged with coarse particles of the suspension being withdrawn, as a result of which the suspension does not fall into the body of the sampler

2 and intermediate tank 6.

On command from the software control unit, the electric motor 5 begins to rotate the shaft with knives 4 mounted on it, which clean the inlet filter 3 of the sampler 2 and the suspension flows through the sampler housing into the intermediate tank 6. The partially cleaned suspension enters the dispenser 7

accumulation of the sample and then into the overflow dispenser 12. At the same time, the valve 10 connects the accumulation of the sample accumulator 7 with the atmosphere, and the valve 13 is closed.

After triggered float

the level indicator (float) 9, at the command of the software control unit, stops the electric motor 5 and switches the taps. In this case, the valve 10 connects

an accumulation dispenser 7 with compressed air piping, and a faucet 13 dispenser 12 with sewage and the test medium from accumulation dispenser 7 using compressed air is supplied through a transport pipeline (up to 30 m long) through an overflow dispenser 12 to the sewage system, and the transport pipeline is flushed out and the overflow dispenser is 12 times the sample volume, and in the dispenser 12 there remains a sample volume not exceeding the total volume of the rotor sections 19 of the centrifuge. Thus, the influence of residuals

the next sample for the composition of the next in the transport pipeline and overflow dispenser 12.

After that, on command from the control unit, the valve 13 is closed, and

 14 connects the outlet of the overflow metering device 12 to the fixed nozzle 16 of the centrifuge 17. Then the program block turns on the engine 18, which rotates the centrifuge rotor 19, and the sample not exceeding the total volume of the centrifuge rotor sections 19 is injected from the overflow meter 7 with compressed air the rotating rotor section 19 cent and the vacuum through the fixed inlet pipe 16 of the loading. At the same time, the cleaned suspension partially removes the cleaned suspension from the intermediate tank 6 by cleaning the reverse flow of the sampling casing 2 .

Thus, the effect of the residues of the sample on the composition of the subsequent sample is eliminated. Following the command, the compressed air supply to the dispenser 7 is switched, the valve 10 is switched to the Closed position, and the filter 3 of the inlet sampler is clogged with a solid phase, preventing the suspension from entering the container 1 into the probe body 2.

Centrifuge 17 brightens the sample. The rotor speed of the centrifuge 19 is 7,000 rpm, with a separation factor of 5,000.

At the command of the software control unit, the engine 18 is turned off, and the crane 22 unloading the rotor 19 of the centrifuge is connected to the industrial-. lenny analyzer. After stopping the rotor 19 of the centrifuge, the clarified filtrate by gravity on the inclined bottom 25, the angle of inclination of which is less than the angle of repose of the solid phase (Fig. 2), merges I

with a stationary collector 26 and through the discharge pipe 21 and the crane 22 unloading of the rotor 19 of the centrifuge is supplied for analysis to the industrial analysis torus. At the same time, there is no mixing of solid phase and clarified filtrate, since the angle of inclination of the bottom 25 is chosen less than the angle of repose of the solid phase.

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Claims (2)

1. AUTOMATIC SAMPLING SYSTEM, comprising a sampler, an intermediate tank, a sample accumulation dispenser connected by a transport pipe to a switching device configured to connect to the analyzer and to sewers; the pulp dehydration unit and the control unit, with the aim that, in order to increase the representativeness of the sample by eliminating the influence of the remnants of the previous sample and automating the process, the switching device is made in the form of an overflow dispenser equipped with a flushing source water, the pulp dewatering unit is made in the form of a centrifuge with a multi-section rotor installed between the overflow dispenser and the analyzer, while the sampler is fixed with a perforated end surface and is equipped with knives inside it, and the centrifuge rotor is made with an inclined bottom. 2. The system according to claim 1, characterized by the fact that, the bottom of the rotor is filled with a slope smaller than the angle. About the natural slope of the solid phase. TF8191 l 1 (161841