Electronic weighing device for dosing batch components

Description

[0001] The utility model relates to the field of control and measuring equipment, namely to intelligent weighing devices intended for precision dosing of components of chemical reactions in laboratory conditions and at small-cycle enterprises, in particular for the process of obtaining technical silicon.

[0002] Electronic scales (RU No. 2050528, IPC G01G 19 / 413, published 20.12.1995; RU No. 212837, IPC G01G 19 / 40, published 11.08.2022) are known from the prior art. These scales are standard electronic scales widely used in laboratory practice. They comprise a load-receiving platform, a load cell, and a display for displaying the gross mass. These devices perform exclusively the function of measuring the physical mass of the load placed on them.

[0003] The disadvantages of known devices include the operator's need to perform manual calculations to adjust the sample weight based on the purity of the reagents. This, in dusty and intensive conditions, leads to a high probability of mathematical errors and wastes time. Furthermore, such devices do not allow for rapid response to changes in raw material parameters during batch transitions without interrupting the batch preparation process.

[0004] The PR electronic laboratory scale (Mettler-Toledo GmbH, Switzerland) is the closest in technical essence to a utility model. The PR electronic laboratory scale (State Register of Measuring Instruments of the Russian Federation No. 19145-00, https: / / all-pribors.ru / opisanie / 19145-00-pr), which features calculation and prescription weighing functions, was adopted as the prototype.

[0005] The features of the prototype, which coincide with the essential features of the utility model, are the presence of a weighing platform, a weight sensor, a data processing unit and a display.

[0006] The disadvantages of the known prototype include high cost and difficulty integrating into small production facilities, as well as redundant functionality that is not adapted to the specific task of carbothermic reduction of silicon dioxide, which requires a specific stoichiometric calculation algorithm. The economic impracticality of their use prevents them from being installed in small laboratories.

[0007] The objective of the utility model is to create a compact, reliable and affordable intelligent device that transforms the passive process of mass measurement into an active process of controlling the composition of a chemical batch, eliminating the human factor in calculations.

[0008] The technical result of the utility model consists in automating the process of preparing the batch taking into account the variable chemical composition of the raw materials, reducing the time for preparing a portion from 120-180 seconds to 10-15 seconds, and also minimizing the risk of dosing errors due to algorithmic calculation.

[0009] The specified technical result is achieved in that the electronic weighing device for dosing components of chemical reactions, containing a housing, a weighing platform, a strain gauge and an information display unit, according to the utility model, it is equipped with a microprocessor control unit based on an AVR architecture microcontroller and a 24-bit analog-to-digital converter, while an algorithm for automatically calculating the mass of the reducing agent additive is integrated into the microcontroller software ( ) in real time according to the formula:

[0010] ,

[0011] where - current mass of the main component, - purity coefficient of the main component, - the purity coefficient of the reducing agent, and - stoichiometric coefficient of the reduction process (for the process of obtaining technical silicon ), while the device is equipped with an interface for entering reagent purity data, implemented in the form of tact control buttons.

[0012] The difference between the utility model and the prototype is that the microcontroller software is algorithmically programmed to provide a two-stage correction of the purity of the original components using specific molar constants ( And ), as well as the use of an accessible element base (HX711, Arduino), which makes it possible to create a specialized dispenser.

[0013] The presence of distinctive features allows us to conclude that the utility model meets the patentability requirement of “novelty”.

[0014] The utility model is illustrated by drawings:

[0015] Fig. 1 shows the structural diagram of the weighing device.

[0016] Fig. 2 shows the general view of the device.

[0017] Fig. 3 shows the display interface for displaying the calculated data.

[0018] The device comprises a housing 1 containing a graphic OLED display 2 and control buttons 3 for entering raw material purity parameters. Housing 1 houses a microprocessor control unit based on an ATmega328P microcontroller. The device also contains a weighing platform 4 made of impact-resistant, chemically resistant ABS plastic, which is mechanically connected to a cantilever-type strain gauge with a maximum weighing limit of 20 kg. The sensor is connected to a 24-bit analog-to-digital converter (e.g., HX711), which amplifies the signal and transmits it to the microcontroller. The microprocessor control unit is connected to the graphic OLED display 2 via the I2C bus. Power is supplied by a 5V DC source with a noise filtering system.

[0019] The device operates as follows.

[0020] Before starting work, the operator enters the current values ​​of the purity of the raw materials through the settings menu using the buttons: the purity of silicon dioxide ( ) and the purity of the reducing agent ( ), the values ​​of which are displayed on the display.

[0021] When placing a sand load on the platform ( ), the strain gauge generates an analog signal, which is converted into digital code by an analog-to-digital converter. The microcontroller reads the data, applies a moving average filtering algorithm to eliminate noise, and calculates the mass of the pure substance.

[0022] Next, in automatic mode, without operator intervention, the device calculates the required mass of carbonaceous reducing agent ( ) based on the stoichiometric ratio stored in memory and the introduced purity coefficients.

[0023] The calculation result is instantly displayed at the bottom of the display (the "ADD" area), allowing the operator to add the second component until the target value is reached, controlling the process by the mass of the pure substance, not the gross mass.

[0024] Using the utility model allows eliminating complex intermediate calculations, reducing the likelihood of defects in silicon production, and increasing labor productivity in laboratory conditions by reducing the number of weighing stages from five to one.

Claims

An electronic weighing device for dosing batch components in the production of technical silicon, comprising a housing, a weighing platform, a strain gauge sensor and an information display unit, characterized in that it is equipped with a microprocessor control unit based on an AVR architecture microcontroller and a 24-bit analog-to-digital converter, while an algorithm for automatically calculating the mass of the reducing agent additive (M) is integrated into the microcontroller software. ADD ) in real time according to the formula: , where M RAW - current mass of the main component sample, P SiO2 - purity coefficient of the main component, P C - the purity coefficient of the reducing agent, and K is the stoichiometric coefficient of the reduction process, where K ≈ 0.4 for the process of obtaining technical silicon, while the device is equipped with an interface for entering data on the purity of the reagents, made in the form of tact control buttons.

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