SU1140955A1 - Spiral screw cutting tool for disintegrating wood to chips - Google Patents

Abstract

SPIRAL SCREW CUTTER FOR CUTTING WOOD ON A TAPE, containing VA; 1, on which}) i is attached a spiral-helix blade with an outer cutting edge, front working surface and back surface, characterized in that in order to reduce cutting forces and improve quality chips by providing guaranteed splitting of cut wood into chips along the fibers, the cutting edge of the spiral-helix blade is sharpened to form an acute angle between the forming front surface and the plane Dikulja molecular shaft and the rear surface spiralnovintovogo web formed with an undercut. (P ate

Description

The invention relates to the forest industry, in particular to equipment for chopping wood.

A spiral cutter is known, comprising a shaft on which a rotor with a helical surface is fixed, and on the latter a cutting edge 1.

Also known is a spiral-helix cutter for chopping wood into chips, which contains a shaft on which a spiral-helix blade with an outer cutting edge, a front working surface and a back surface 2 is fixed.

The disadvantages of the known incisors are large cutting forces and low quality chips.

The purpose of the invention is to reduce the cutting effort and improve the quality of the chips by ensuring guaranteed splitting of the cut wood into chips along the fibers.

The goal is achieved by the fact that in a spiral-screw cutter for chopping wood into chips, containing a shaft on which a spiral-helix blade with an outer cutting edge, front working surface and back surface is attached, the cutting edge of the spiral-helix blade is Sharpened to form an acute angle between the forming the front working surface and the plane perpendicular to the shaft, and the rear surface of the spiral-helix blade is made with undercut.

The drawing shows a spiral screw cutter, a general view.

Spiral-screw cutter contains shaft 1 and bearings 2. Helical-helical blade 3 is fixed to the shaft 1 along a helical line with a pointed outer cutting edge 4. The front working surface 5 of the cutting edge 4 faces outwards and the rear surface 6 of the spiral-spiral blade 3 made with undercut 7. The wood to be processed 8 is placed in the guide tray 9.

A helical screw cutter for chopping wood into chips works as follows.

The shaft 1 with the spiral-helix blade 3 is rotated in the supports 2 in the direction of increasing the pitch of the spiral-screw blade. On top of the tray 9 spiral wood screw 3 serves wood 8 for processing, which capture the cutting edge 4 of the upper turn of the spiral screw blade 3. The cutting edge 4 is embedded in the wood, cuts some fibers and simultaneously carries wood 8

way down. As the pitch increases, the spiral-helix blade deeper and deeper into the wood, and the tree moves down the guide tray 9 until the cutting edge 4 of the greatest pitch of the spiral-helix blade 3 completely cuts the fraction of wood with a length equal to the helix-pitch. blades 3. Simultaneously with the introduction of the cutting edge 4 into the wood, the front working surface 5 of the cutting edge 4 together with the cutting force P creates a chipping force Q, breaking off the pieces of wood with a length equal to the pitch of the spiral screws the blade 3, and the thickness proportional to the length of the front working surface forming 5. Pieces of wood chipped off by the lower turn of the spiral-helix blade 3 are fed down, and 3 pieces of wood chipped off by the upper coils of the spiral-helix blade , in its undercut 7, then, in the process of rotation, they descend down the inclined surface of the spiral-helix blade 3 and its last turn is removed outside.

When used in crushers as a working body of a spiral-helix cutter of the proposed design, two-, fourfold savings are possible in the energy spent on shredding a unit volume of wood or branches, compared to disk or drum crushers and simplifying the design. Due to the absence of shock loads, the time between regrinding of the cutting edge is significantly longer.

Claims (1)

SPIRAL-SCREW CUTTER FOR GRINDING WOOD ON A CHIP, containing a wad on which a spiral-screw blade with an external cutting edge, front working surface and rear surface is fixed, characterized in that, in order to reduce cutting forces and improve the quality of wood chips by ensuring guaranteed splitting cut wood onto wood chips along the fibers, the cutting edge of the spiral-spiral blade is pointed with the formation of an acute angle between the generatrix of the front working surface and the plane, perpendicular oh shaft, and the rear surface of the spiral screw web is made with undercut.