SELF-PROPELLED BELT SAWMILL Russian patent published in 2013 - IPC A01G23/08 B27B15/00 

FIELD: agriculture.

SUBSTANCE: invention relates to the field of forest harvestings operations. Sawmill comprises a belt saw, a roller conveyer (4), a table (6), a support (7), a mechanism (8) of pressing the logs (9) to a support, a device (10) for removal of chips, and a control unit (11). The saw is mounted in the sawing head (2). The sawing head is cantilever fitted on a vertical rack (3) with the ability to move on it up and down and back. The roller conveyer consists of three parts, hingedly connected to each other and having hydraulic cylinders (5) of double action. The sawmill is mounted on a power unit (12). The power unit comprises a motor unit (13) connected by the cardan-joint (14) to the current generator (15), a cabin (16), a crawler truck (17) with the front (18) and rear (19) carriages with springs (20), and a device (21) to secure them relative to the frame (22) of the crawler truck. The vertical rack of the sawing head is mounted on the frame of the crawler truck with the ability to rotate around its axis with the sawing head with double acting hydraulic cylinder at a given angle. The cotangent of this angle is equal to the ratio of the ultimate resistance value of the wood species of the sawn timber at compressing along the grains to the ultimate resistance value of the wood species of the sawn timber at a tangential shearing along the grains. On the vertical rack of the sawing head from above the axis of the pivot arm of the variable resistor head (25) is mounted coaxially. The resistor housing is attached to the crawler truck frame. The milliamperemeter (27) included in one electric circuit with a variable resistor, is mounted in the power unit cabin. The milliamperemeter scale is scaled in degrees.

EFFECT: simplified design of the sawmill, reduction of peak loads on the blade of the belt saw, saving of energy is provided.

3 cl, 5 dwg