RU2456550C1 - Multi-position batcher-collector device - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: multi-position batcher-collector device consists of a sealed collector in form of a square made from transparent organic glass or carbonate below, on the outer side of which batching elements are attached. According to the invention, the batching elements have a movable cylinder which moves along the a fixed rod inside the cylinder, said rod having a longitudinal through hole for sucking liquid through a vacuum inside the collector where an excess collected dose of liquid is collected for washing the batching elements.

EFFECT: possibility of fast establishment of the required dose of liquid without replacing batching devices, cutting time for establishing dosage and high accuracy of positioning.

3 dwg

Description

The proposed aggressive fluid metering device is designed for multi-position selection of the exact dose of solutions of acids (HCl, H ₂ SO ₄ , HclO ₄ , etc., except hydrofluoric), alkalis (NaOH, KOH, NH ₄ OH, etc.) and salts, as well as soil and plant extracts with volumes up to 25 cm ³ (on request up to 50 cm ³ ) from process cassettes used for preparing soil, plant and other samples for chemical analysis, and transfer of the selected dose to other process cassettes.

The dispenser-selector is used in conjunction with multi-position technological cassettes, for example, KSM - a cartridge with glasses upgraded, KMM - a cartridge with small containers upgraded, KBM - a cartridge with large containers, upgraded and other cassettes compatible with the proposed device.

The scope of the invention relates to agrochemical methods of soil analysis in assessing the fertility of agricultural land, as well as methods for chemical analysis of feed, plants, food raw materials and natural waters using in-line analytical technology (analytical laboratories of the agricultural chemical service, veterinary medicine, environmental protection, geochemical studies and other).

The device, for example, can be effectively used in analytical laboratories conducting mass analyzes of the chemical composition of soils, feeds and food raw materials (laboratories of the agricultural chemical service, sanitary-epidemiological service, environmental service, laboratory of design and survey services, educational and research institutions and other departments).

A multi-channel device is known for sampling and dosing during the preparation of a liquid sample for mass chemical analysis in the listed objects (Guidelines for the organization, commissioning and testing of production lines of mass analysis of soils and plants for the content of macro- and microelements using new equipment. Moscow. - 1983 . P. 118).

The dispensing element of this device is a Mora serial pipette, specially cut to the label with a constant volume. If it is necessary to change the fluid sampling dose, it will be necessary to replace the metering elements and at the same time observe their complete identity, which requires a lot of time (working shift) is quite difficult and painstaking, since it requires the choice of 10 pipettes from a large batch that are absolutely identical in size (diameter and length) .

The aim of the invention was to create a dispenser-selector that allows you to quickly set the required dose of liquid without changing the metering devices, which could lead to the possibility of using different doses of liquid on one device and significantly reduce the time of setting doses and increase the accuracy of dosing.

The device we offer just greatly simplifies the work process, since it does not require replacement of the metering element; thereby the process is significantly accelerated.

A ten-position dispenser-selector (see the hydraulic diagram of the dispenser-selector using the metering elements of the proposed design, Fig. 1) consists of an airtight collector 1 in the form of a square profile (pipe) made of transparent plexiglass or carbonate. The collector 1 is mounted on two side vertical racks connected to a massive base (figure 3 - ten position dispenser-selector of aggressive liquids with a new metering element). At the bottom of the collector 1, with a pitch of 45 mm, 10 metering elements 2 are installed (FIG. 1). Each metering element 2 (FIG. 2) consists of a fixed rod 3 and a movable cylinder 4. The cylinder of the metering element 2 has the ability to move along the stationary rod 3, which seals the internal volume with two silicone rings. The upper end 5 (FIG. 2) of the fixed rod 3 enters the collector 1 (FIG. 2) through a sealed silicone sealant, which is pressed by the screw head 6 of the fixed rod 3 (FIGS. 1 and 2). The lower end 7 (FIG. 2) of the metering element 2 is connected by means of a silicone tube to a fluoroplastic tube through which liquid is sucked from the capacity of the cassette 8 (FIG. 1) when rarefaction occurs in the collector 1. On the lid of the collector 1 on the right side there is a fitting for connecting the collector to the suction and air-pumping diaphragm pump 9 (Fig. 1) through a switching valve 10 (Fig. 1). In the lower part of the collector 1 on the right side there is an overhead valve 11 (Fig. 1), through which it is possible to drain the fluid flowing through the metering element 2 into the collector 1.

On the side racks mounted lifting mechanisms with brackets for installing process cassettes (figure 3). On the right side, under the collector, there is a lifting wheel, rotating which you can raise the cartridges with the solution to the metering elements or lower them to their original position.

On the left side of the dispenser there is a latch that secures the cassettes at any height (figure 3).

Dosing elements 2 are replaceable for a maximum volume of 5, 10, 25 cm ³ . In the range of each maximum volume, you can easily set any desired dose volume.

The technology of work on a ten-position dispenser-selector.

The operator installs a process cassette, for example KSM with a solution on a lifting device, and raises it so that the ends of the metering elements 2 are immersed in the solution to a depth not deeper than 10 mm. Then, the overhead tap 11 (FIG. 1) discharges the liquid from the collector 1, and by turning the switch tap 10 (FIG. 1) the collector chamber 1 is connected to the suction on the membrane pump 9. The membrane pump 9 is turned on (FIG. 1). As a result of rarefaction in the chamber of the collector 1, the solution from the capacities of the technological cartridge KSM begins to flow into the metering elements 2 and then overflow through their tubes into the chamber.

When the overflow occurs in all 10 metering elements 2, the operator shuts off the pumping air from the chamber with a switching valve 10 (Fig. 1). Lower the cartridge to its original position, remove it and install a technological cartridge in its place, for example, KMM. Then, the switching tap 10 (Fig. 1) is turned to pump air into the collector 1, which leads to the discharge of measured doses of solutions from the metering elements 2 into the container of the supplied KMM process cassette. After that, the operator through the overhead valve 11 (Fig. 1) discharges the accumulated liquid from the collector chamber 1. The technological cycle is repeated. Care should be taken to ensure that the fluid level in all selected containers is the same.

After completion of the work, the device is washed with distilled water, performing several dosing cycles.

Setting the dose of fluid.

Setting the dose of fluid and checking the dosed volume is as follows. Doses are selected from ten containers of the process cartridge with distilled water, which are then merged into the tanks of the KSM technological cartridge. Preliminarily, the capacities of this technological cartridge are removed from the latches so that they can easily be removed from the cartridge frame socket. Each container with a dose of distilled water is weighed to the nearest 0.005 weight of the nominal value of the dose. If the mass of the selected dose is outside the tolerance, move the cylinder of the metering element 2 down (increase in mass) or up (decrease in mass) and repeat the operation again until the necessary indicators are achieved.

Claims (1)

The device of a multi-position dispenser-selector, consisting of a sealed collector in the form of a square profile of transparent plexiglass or carbonate, at the bottom, on the outside of which metering elements are attached, characterized in that the metering elements have a movable cylinder moving along a stationary rod located inside the cylinder having a longitudinal a through hole for liquid suction by vacuum in the manifold, where the excess of the selected dose of liquid is collected to flush the metering element ta.

Images