RU202U1 - Hydrometer of lumber in a stack - Google Patents

Abstract

The moisture meter of the lumber in the stack, containing a primary transducer with two measuring electrodes, each fixed at its end in a common housing, characterized in that at least one of the measuring electrodes is made in the form of a rod, with at least one longitudinal plate mounted on its surface and made of elastic electrically conductive material, and the transverse dimension of the rod is less than the distance between the horizontal rows of lumber in the stack, and the maximum transverse dimension is the first electrode by at least 20% greater than the distance between the horizontal rows of lumber in a stack, wherein the measuring electrode with a longitudinal plate in the housing rotatably on its axis.

Description

Hydrometer of lumber in a stack

Invent you belong to the field of analytical instrumentation I can be used to control the moisture content of sawn timber from wood

Known electronic moisture meter / I / containing a sensor with measuring electrodes and a turkey unit. The measurement principle is based on the dependence of the electrical resistance between the electrodes embedded in the wood on its moisture content.

The known device cannot be used to measure the moisture content of sawn timber in a stack due to the limited infertivity of the measurement, since the volume of wood in which a single measurement is made does not exceed several cubic centimeters.

The closest analogue is a hygrometer / 2 /, containing a primary transducer with two measuring electrodes, each fixed at its end in a common housing.

A disadvantage of the known device is the low accuracy of moisture measurement.

The technical result, which consists in increasing the accuracy of measuring the moisture content of lumber in the stack, is achieved by the fact that in the moisture meter of the lumber in the stack containing a primary transducer with two measuring electrodes fixed at each end in a common housing, at least one of the measuring electrodes is fully in the form of a rod, with at least one longitudinal plate mounted on its surface and made of elastic electrically conductive material, the transverse dimension of

I changed the distance to the horizontal rows of lumber in

the stack, and the maximum transverse dimension of the measuring electrode is at least $ 20 more than the distance between the horizontal., and the pilates in the stack, while the small electrode with the plate is fixed in the housing with the possibility of rotation around its axis.

When using the measuring electrode according to the invention, reliable contact with the sawn timber is ensured due to the longitudinal plate of an elastic electrically conductive material that performs the spring contact contact in the working positions of the measuring electrode. Thus, the measurement accuracy is improved by eliminating the influence of the surface roughness of the pilomatepials. Higher change accuracy is achieved by using two measuring electrodes

of the claimed design, placed between two horizontal rows of sawn timber in a stack, by reducing the influence of uncontrolled changes in the thickness of sawn timber and gaps between their horizontal rows. For tshksiiii distance between the measuring elektrodrody, which allows to increase the accuracy of measurements due to the possibility of calibration of the device on the reference material, the points of the electrodes are placed in a common housing. In this case, the rotation of the electrodes around the longitudinal axis ensures the transfer of elastic electrically conductive plastic from a non-thermal to a working position.

da the drawing shows: non-Tag I - a general view of the claimed device with two measuring electrodes in a fragment of a stack; on the

$ h 2 / 1- execution of measuring electrodes Ca-, -6, -c); on the

1yg., B - cross sections of measuring electrodes of various

Fopm tA, -, -i, P); on, ig Qv cross-sectional measurement

- 2 2 &

connected to the primary converters (not shown).

The measuring electrode I and / or 2 is made in the form of a rod 3 is an ALA dielectric of a metal on which a longitudinal plate 4 is fixed, made of an elastic electrically conductive material, for example, bryza. To ensure reliability of contact with lumber having a spread in thickness, several plates can be fixed on (Fig. 9.8). To enable calibration of the device at a fixed distance between the electrodes, their ends protruding beyond the stack are placed in the General housing (not shown in the drawing). The thickness of the gaskets 5 is 20-2. mm The transverse dimension of the rod (in this case its diameter) is not the thickness of the used gaskets and, accordingly,: less distance between the horizontal rows of lumber in the stack, because this distance is determined by the thickness of the gaskets. The maximum cross-section of the measuring rod is determined by the width of the longitudinal plate, which is fixed on the rod and is at least 20 / o greater than the distance of the horizontal slab with horizontal rows of lumber. the body can be rotated around its axis,

The device operates as follows. The measuring electrode is in the neutral position (Fig. 3) is freely introduced in the space between the horizontal rows of sawlogs, the distance between which is greater than the transverse dimensions of the electrode. To conduct the measurement, the electrode is brought into the operating position (Fig. Jo) by turning about 90 ° around the longitudinal axis. In this case, the longitudinal plate 4 comes into contact with the wood and bends, since the transverse size of the electrode is greater than the distance between the horizontal rows of palometrial in the stack. Due to this, a reliable contact of the measuring electrode with pyelomatheal is achieved.

 in

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„No.

The placement of the ends of the measuring electrodes in a common housing allows

keep fixed the distance between the electrodes when turning to the rods around the longitudinal axis. Moisture measurement can be based on the impedance measurement method or the dielcometric method.

The invention can be used in a moisture meter or in carrying moisture with a dalcometric type en er, intended to check the moisture content of lumber in the stack during storage and atmospheric drying, as well as before and after convective chamber S.USHKSH.

-4- %

Compiled by AG / il, Preobrazhenskaya

Claims (1)

The moisture meter of the lumber in the stack, containing a primary transducer with two measuring electrodes, each fixed at its end in a common housing, characterized in that at least one of the measuring electrodes is made in the form of a rod, with at least one longitudinal plate mounted on its surface and made of elastic electrically conductive material, and the transverse dimension of the rod is less than the distance between the horizontal rows of lumber in the stack, and the maximum transverse dimension is the first electrode by at least 20% greater than the distance between the horizontal rows of lumber in a stack, wherein the measuring electrode with a longitudinal plate in the housing rotatably on its axis.