SU819671A1 - Device for monitoring moisture content in fibrous loose materials in a flow - Google Patents

Description

This invention relates to a measurement technique and can be applied in the manufacture of tobacco products. The known devices for measuring the moisture content of tobacco and similar products in the stream are based on determining the humidity by measuring the electrical capacitance of the primary converter filled with the test product. At the same time, the humidity of the product 1 is determined by the measured electrical capacitance. The closest technical solution to the invention is a device containing a transport chute, side transport channels, a measuring channel of a V-type, side and bottom measuring capacitor plates, oscillatory supports and a temperature measuring transducer. 2. A disadvantage of the known device for capacitive measurement of humidity is the uneven filling of the measuring channel with tobacco, which reduces It does not measure the accuracy of tobacco moisture. The aim of the invention is to reduce raw material losses and improve product quality, achieved by improving the process flow by improving the accuracy of continuous moisture measurement of fibrous bulk materials in a stream, such as tobacco. The goal is achieved by the fact that the measuring channel of the V-shaped type is made with a varying cross-section along the length, whereby the cross-sectional area of the channel of the V-shaped type is made constant along the length and the angle between the side walls of the measuring channel of the V-shaped type increases from 60 ° in the zone of backfilling of material to 120 ° in the zone of measuring humidity. FIG. Figure 1 shows two sections of tobacco flow; in fig. 2 - the proposed device. In the initial narrow part of the measuring channel where the humidity measuring transducer is filled with shred tobacco, the cross section is an A | C |, Bi, having a base angle of 60 ° and a triangle AiDiB. In the wide - end part, where the humidity of cut tobacco is measured, the cross section is a triangle having a base angle of 120 ° and a triangle AzDiBz. As a result of applying the proposed design of the measuring channel, due to the small amount of base angle d, possible variations in the amount of tobacco, passing above the level of the edges of the measuring channel in the section y4iDiBi, in relation to the amount of tobacco passing through the section. Then, by gradually increasing the base angle to ot, the lower part of the measuring channel is filled at the end of the measuring transducer of cut tobacco, where the measuring electrodes are located. Let us consider how many times the section is reduced by decreasing the angle of the base a in the filled-in part of the measuring channel. formed by an excessive amount of tobacco. For this purpose, we calculate the ratio To the areas of the AzOg B2 triangle (Fig. 1) with an angle of ot 120 ° and a triangle L1O1B1 with an angle of N, 60 °. . . i u-SuA P Bt. H / L, & g -5dA, DV, - / SHCHL Ty-1lL / a E Since it is assumed 5dI, C, 6,, Vg,

that

about(

 ,

where do we get

.. tg30 "

 3,

Thus, by reducing the angle a in the backfill zone, the maximum amount of tobacco, the passage above the edges of the measuring channel, is reduced three times. Further, in the measurement zone, the angle a increases to 120 °, which ensures that the lower part of the measuring channel is completely filled.

The proposed device for continuous measurement of the moisture content of fibrous granular materials in a stream, including shredded tobacco, contains a measuring channel 1 of a V-shaped type with varying cross-section along the length, located in the middle of the transport chute 2, mounted on oscillatory supports 3. On the sides of the measuring channel 1 there are side transport channels 4. In the end - wide part of channel 1, the formula of the invention

A device for continuously measuring the moisture content of fibrous bulk materials in a stream, comprising a transport chute, lateral conveying channels, a measuring channel of the V-type, lateral and lower measuring capacitor plates, oscillatory

a support and a temperature measuring transducer, characterized in that, in order to increase the measurement accuracy, the measuring channel of the V-type is made with a variable angle of cross section between

in the initial - narrow part, the measuring channel has a section angle between the side walls in the range of 30-90 °, in the final - wide part in the range of 80-140 °, and the value of the cross-sectional area of the measuring channel is V-shaped by lenght.

Sources of information taken into account in the examination

1. USSR Author's Certificate No. 352206, cl. G 01 N 27/22, 1970.

2. The patent of Germany No. 1150535, cl. 42 i 19/04, 1964 (prototype). The lateral capacitor measuring plates 5 are laid, the lower measuring capacitor plate 6 and the temperature measuring transducer 7. The device operates as follows. The product, for example, tobacco, is fed into the backfill zone — the narrow part of the measuring channel of V-type 1 with a variable cross-section along the length and moving in the direction indicated by the arrow due to the vibration of the transport chute 2 by means of oscillatory supports 3. Excess tobacco is poured into the lateral transport channels 4. As you progress, tobacco is distributed in a V-type measuring channel 1 that extends along its length. In this way, uniform filling of the channel I with tobacco in the measurement zone is ensured - between the lateral measuring capacitor plates 5 and the lower measuring capacitor plate 6. This creates a more constant geometry of the electric field, by means of which the humidity of the tobacco is measured. Correction of moisture measurement results from tobacco temperature is introduced using a temperature measuring transducer 7. The technical and economic effect is obtained by more accurate measurement of the moisture content of fibrous bulk materials in the stream, which will improve the process flow and reduce the loss of raw materials.

Claims (1)

Claim A device for continuously measuring the moisture content of fibrous bulk materials in a stream, comprising a transport chute, side transport channels, a V-type measuring channel, side and lower measuring capacitor plates, vibration supports and a temperature measuring transducer, characterized in that, in order to increase the measurement accuracy , the measuring channel of the V-shaped type is made with a cross-sectional angle between the side walls of variable length, and in the initial - narrow part of the measuring The trough has a cross-sectional angle between the side walls of 30–90 °, in the final – wide part within 80–140 °, and the cross-sectional area of the V-type measuring channel remains constant in length.