SU978781A1 - Shavingless cutting of trees - Google Patents

Description

DEVICE FOR BELARUS-FREE

(54)

The invention relates to devices for smooth cutting of wood and can be used for felling trees in the logging industry.

A device for chipless cutting of trees, mounted on a station relay of a logging machine and comprising a carrier frame, two double-sided sharpening knives and a drive for turning the knives l.

However, such a device does not provide an improvement in the quality of the cut surface and does not increase the output of the business field.

It is also known a device for sand-cutting of trees, mounted mainly on the boom of a logging machine and comprising a body, two knives of brushless cutting with double-sided sharpening and turning of the blades of C 23 cutters located in the same plate.

In this device, however, it is possible the spreading of cracks and the breaking of wood at the point where the knives come together, which is -. leads to less business exits & springs.

The purpose of the invention is to improve the quality of trees cut by reducing the number of cracks and tears of wood at the descent of the knives.

The goal is achieved by cutting

10, the edge of one of the knives is shifted vertically relative to the cutting edge of the other knife and the value equal to 2. 20% of the THICKNESS of the knife.

FIG. 1 shows a device that looks like &15; in fig. 2 shows section A-A in FIG. one.

The chipless cutting device comprises a housing 1, on

Claims (2)

20 of which two knife-holders 2 are installed with knives 3 fixed on them, hydro-cylinder 4 drives knives 3 and intermediate levers 5 and 6. Knives 3 are dispersed in an intermediate plane and have 1 symmetrical sharpening of cutting edges 7, such that when knives 3 go the moment of completion of cutting the tree, the cutting edge 7 of one of the knives 3 is offset in flexing relative to the cutting edge 7 of the other knife 3 by an amount X equal to 2-2% of the thickness of the knife. A device for chipless & underreport trees works as follows. When the blades 3 are opened, the device is brought to the tree up to the stop. Then, by turning on the hydrosynder 4, the lever 5 and 6, the knife holders 2 with the knives 3 are set in motion, and the tree is cut. The proposed sharpening of the cutting edges allows you to avoid the formation of a stress center in the cut wood fibers in the place of the cheap knife shells, as happens in conventional devices in which the formation of such a zone is accompanied by the spread of cracks along the tree trunk and the formation of wood in the place of the knives. . The vertical displacement of the cutting edge of one of the knives relative to the cutting edge of the other knife by δBN 14, equal to 2-20% of the thickness of the knife, significantly reduces the stress of stretching with wood in the descent of the knives and thereby reducing the outflows, formation of rails and increasing output of industrial wood by 5-10%. The invention of the device for a brushless c & trees, mounted mainly on the boom of a logging machine and containing a cortus, in the same plane two knives of a brushless cutting with double-sided sharpening and driving the turning of the knives, and that, in order to improve the quality of the cut of trees by reducing the spread of fissures and cutting wood at the knives, the cutting edge of one of the knives is shifted vertically relative to the cutting edge of the other knife by avnuyu 2-2O% knife thickness. Sources of information taken into account in the examination 1. US patent number 3888287, cl. 144-34, 1975. 2. USSR Author's Certificate No. 49О432, cl. AOIG 23/08, 1973 (prototype).