SU918781A1 - Method of sweep of round timber determination - Google Patents

Description

(5) a method for determining the curvature of a round timber.

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The invention relates to a measurement technique and can be used in the forest industry and in the management of a process for the production of roundwood.

A known method for determining the curvature of roundwood timber is that the thickness of the timber is measured along its length and the curvature of the timber 1 is determined from the difference in thickness.

The disadvantage of the method consists in the impossibility of determining the type of curvature.

The closest to the proposed technical essence is a method for determining the curvature of round timber, which consists in measuring the thickness of timber in two directions shifted by a given angle, in cross-sections with lengthwise distances determined with constant pitch sections, we construct a conditional

line of perfectly straight timber, calculate the deviations of the centers of cross sections from the conventional center line and compare the resulting deviations between each other 2}.

The disadvantage of this method is the lack of accounting for the measurement of measurements in the presence of knots on the timber.

The purpose of the invention is to increase the measurement informativity.

This goal is achieved by determining the type of curvature by the number of extremes of deviations of the centers of cross sections from the conventional center line,

15 determine the sections with a constant bending direction, calculate the deflection arrows on each of these sections and, judging from the largest JP deflection arrow, judge the curvature of the timber.

Claims (2)

In addition, the coordinates of the centers in cross sections, the thicknesses of which are free from the influence of the knots, are determined. 3 The drawing is a schematic of the method for determining the curvature of round timber. The method for determining the curvature of a round timber is as follows. In the cross section of round timber 3, free from the influence of knots, two sources 1 and 2 light are installed to illuminate the timber 3 in two strands offset by a given angle. If oi is 90, then the coordinates xs, and y, j of the center of the section in the Cartesian axes of the HOU are determined by the formulas, "K. y. ) & .t, -Kg Sst. 1 is where x $,. Ys, and X5, Yi. coordinates, respectively, of the sources 1 and 2 of the light in the axes of the HOU, E UE2 coordinates of the beginning and end of the shadows falling on the axis of the coordinates of the HOU as a result of illumination of the timber, respectively, sources 1 and 2 of light. The coordinates of the cross-sectional centers are determined for all sections of the genuinely separated timber 3 with a constant pitch. Constructing the condition of the axial line of perfectly straight timber, connecting the centers of the lower H and upper K end sections. From the known coordinates of the center of the cross sections and the coordinates of the conditional axial line, the deviations of these centers from the latter are calculated. Based on the results, the number of extremes and the type of curvature of the timber are determined. There are no curvatures, if there are no extremes, simple curvature, there is, if there is an extremum of complex curvature, if there are two or more extremes, the magnitude of the curvature Z is calculated using one of the formulas depending on the timber used; 1. О-7 - «: i-uu t - where a is the largest deflection arrow; d is the diameter of the upper K end section. The largest deflection arrow is calculated as follows. The length of the NC of the conventional center line is divided into sections of the HO, DC, and SC, which are enclosed between the base points of intersection of the line of the centers of the cross sections with the conditional center line. A portion of DC is selected. A straight line drawn through two adjacent base points of this section is rotated relative to one of the base points so that the second end of the straight line moves along the center line of the cross sections until the increase in the deflection arrow of the center line stops relative to. turning right my. Then, the direct rotation is made similarly to the new position of the previously moving point. Plot B 8 of the center line of the cross sections is a plot with a constant bending direction. In the same way, all areas HB2 and BjK of timber with a constant bending direction are determined, arrows are calculated,. A B and the deflections in these areas and the largest of them are used to calculate the timber curvature. The present invention makes it possible to determine a complex curvature and to improve the accuracy of calculating the curvature values of round timber, Formula 1, A method for determining the curvature of round timber, which consists in measuring the thickness of the timber in two directions offset by a given angle in cross sections, separated by a length with a constant pitch, determine the coordinates of the centers of these cross sections, determine the conditional center line of an ideally straight timber, calculate the deviation of the centers of transverse c from the conventional center line and compare the resulting deviations between each other. Different in that, in order to increase the informativity of the measurements, the type of curvature is determined according to the number of extremes of the deviations of the centers of the cross sections from the conventional center line, the sections with the constant direction of bending The arrows of the deflection on each of these areas are shown, and the curvature of the timber is judged by the largest arrow. 2. The method of claim 1, wherein the coordinates of the centers in the cross sections, the thicknesses of which are free from the effect of the knots, are determined. Sources of information taken into account at. examination 1. US patent ff, KL..A 01 G 23/09, 1971. 2. The US patent, № 3806253, cl. G 01 B 11/10, 197 (prototype).