Crushing element and mills with grinding bodies, mixers, extruders and a pressing worm provided with said crushing elements
First Claim
1. Ground element having a smooth working surface (38) or a working surface provided with a lamellar structure, characterised in that at least two fastening elements (44, 45), which preferably have undercuts (44), beads (48) and/or corners, are provided on the fastening side (36) opposing the working surface (38) for fastening the ground element in corresponding holes in a support body (19).
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Accused Products
Abstract
The invention relates to a ground element for mills, mixers and worms used preferably for the grinding/processing of paper stock and plastics materials comprising ceramic fillings, other fibrous substances such as crude brown coal, beet chip and the like. The ground elements have at least two fastening elements, which can have undercuts (44), beads and/or corners, on the fastening side (36) opposing the working surface (38) for fastening the ground element (41) in corresponding holes in a support body. Ground elements of this type can be arranged on the rotors of high-speed refiners. Rotors of this type have annular sectors which can be composed of a large number of individual ground elements. Differing tasks can, in this case, be assigned to the individual annular sectors. A central sector is formed from securely embedded metal carbides which have high thermal stability and which have emergency running properties if the ground discs are scraped. As a result of the provision of a slightly smaller working gap in the region of this sector, the adjacent sectors are protected from scraping and can be formed by modularly constructed, cost-effective ground elements (lamellar bodies) made of ceramics or pressed carbon fibres. As a result of precise large-scale production by powder injection moulding (PIM) and pressing into a screen-like carrier plate, these lamellar bodies can be produced for any user as desired, with optimum geometry. Exchange is simple and rapid.
17 Citations
59 Claims
- 1. Ground element having a smooth working surface (38) or a working surface provided with a lamellar structure, characterised in that at least two fastening elements (44, 45), which preferably have undercuts (44), beads (48) and/or corners, are provided on the fastening side (36) opposing the working surface (38) for fastening the ground element in corresponding holes in a support body (19).
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39. Ground body comprising a support body (19) and at least two ground elements (41) which are provided on the support body (19) and are arranged one behind the other in a specific direction defined by the direction of conveyance for a ground product, referred to hereinafter as the direction of the flow of material, characterised in that a first ground element (41) is made of materials which ensure “
- emergency running properties” and
in that the working surface (38) of this first ground element projects beyond the surfaces (38) of the other ground element (41) by a specific distance.
- emergency running properties” and
Specification