Woodworking – Slicer – Rotary disk
Patent
1998-12-16
2000-11-07
Bray, W. Donald
Woodworking
Slicer
Rotary disk
1441621, 2412921, B27C 100
Patent
active
061421979
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disc for a disc chipper, said disc being adapted to rotate a disc-shipper shaft and provided with a number of knives for producing chips.
This type of chippers are used in the chipping of fibrous wood for pulping process. A typical diametric dimension for a disc in this type of a chipper is 2,5-3,8 m and the disc has a thickness of 150-250 mm. The discs are manufactured from a single quadratic piece of plate, the blank having a weight of about 10.000-30.000 kg. Manufacturers of this caliber blank plates/castings are few and far between. It is also obvious that working on the blanks requires expensive special machines.
The possible breakdown of a large-mass rapidly rotating disc during the operation of a chipper would, even in the best of circumstances, cause at least an expensive investment on spare parts, a long down-time and production halt. The disc and components associated therewith are subject to extremely strict requirements. The manufacturing costs for a qualitatively acceptable bulky blank are high and the risk of error is considerable. Therefore, it is always necessary to examine the blanks e.g. by means of ultrasonic testing for discovering possible defective points.
An object of the invention is to provide a disc for a chipper, which fulfils the high standards set for such discs, yet is superior over the prior known solutions in terms of costs.
According to the invention, this object is achieved such and a disc of the invention for a chipper is characterized in that the disc is composed of two or more sector-shaped blocks or segments.
Assembling a disc from a plurality of sector-shaped blocks offers a number of benefits: losses of raw material remain low, number of available suppliers of raw material increases, manufacturing is possible with small machine tools, the outer ring and flanges can be made from separate durable materials regardless of the material of the actual disc, the number of knives in a chipper can be altered by replacing the sector-shaped blocks (no need to replace the entire wheel), in a breakdown situation it is possible to replace only the damaged disc components, knives/knife cassettes can be provided with separate points of attachment directly in each sector-shaped block, all sector-shaped blocks can be provided with a casette/knife attachment surface beforehand at reasonable costs, the sector-shaped blocks and shaft of a disc chipper can be transported separately to an installation site, which offers benefits both in terms of transportation and assembling, a disc composed of sector-shaped blocks has a good price value because of savings in raw material, machining is more economical, a possible machining error or raw material defect is limited to the defective sector-shaped component only, the entire disc blank need not be examined separately but just the blank components, sector-shaped blocks can be castings (standard size), different parts of a disc can be made of different raw materials.
Preferred embodiments for the invention are set forth in the sub-claims.
The invention will now described in more detail by way of an example with reference made to the accompanying drawings, in which:
FIG. 1 shows a disc of the invention.
FIG. 2 shows a disc of the invention mounted on the shaft of a chipper.
FIG. 3 shows a sector-shaped block for a disc of the invention in plan view.
FIG. 4 shows a sector-shaped block for a disc of the invention in side view.
FIG. 5 shows a guide element to be fitted between the sector-shaped block of a disc of the invention and the disc.
In FIGS. 1 and 2, a disc of the invention is generally designated by reference numeral 1. The disc 1 is adapted to rotate upon a chipper shaft 2 and provided with a number of knives (not shown in FIGS. 1 and 2) for producing chips. The shaft 2 is fixed relative to a chipper frame by means of bearings 9, 10.
In a solution of the invention, the disc 1 is composed of two or more sector-shaped blocks 3. In the example shown in FIG. 1, the disc 1 includes twelve sector-shaped blocks 3.
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Andritz-Patentverwaltungs-GmbH
Bray W. Donald
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