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列宁格勒林学院水运和水力学教研室与维切格达木材水运局共同研制成水上半自动化选材廊(发明证书№695935)。该选材廊由金属浮船1、前后桥2和3、带漂浮横挡5的横向传送机4组成(见图1。选材廊分为若干段,每段长10米,宽为所选原木长加0.5米。在每段由梁7堵起的侧选材门6内安装电动机驱动的圆筒助推器8。在选材门的上方安装与每段的中心线成45～55度角的双液压推杆9。圆筒助推器装有特殊截面的导向板10,从而能接纳不同直径甚至不同容重的原木。借助专少月固定装置11确保原木推
Leningrad Grove Institute of Water and Hydraulics and Vecigenda Wood Water Board jointly developed into semi-automatic water gallery (Certificate of Invention № 695935). The material gallery consists of a metal pontoon 1, front and rear axles 2 and 3, and a transverse conveyor 4 with a floating cross 5 (see Fig. 1). The material selection gallery is divided into several sections of 10 meters long each, 0.5 meters in each section by the beam 7 side selection door 6 mounted motor driven cylindrical booster 8. Above the selection of the door installed with the center line of each paragraph at 45 to 55 degrees angle of the double hydraulic push Rod 9. The cylinder booster is equipped with a guide plate 10 of special cross section so as to be able to receive logs of different diameters or even different weights.