Importance

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Abstract

A heavy-duty grinder is disclosed having increased durability and longevity due to a construction that produces low mechanical vibrations and noises during operation. The grinder includes a pair of end plates, preferably solid steel, and a pair of cutting blade rotors carried between the end plates, which are also preferably machined from solid steel. A direct in-line hydraulic drive of the rotors is provided by hydraulic motors and compression fittings which lock the hydraulic motors to the rotors without the need of keys or splines. In this manner, a drive and construction is provided which accommodates load reverses, shocks, and shears encountered during the grinding process without detrimental effect to the mechanical integrity of the grinder. Machined blade pockets having recessed heels are formed on the periphery of the rotors. Knife blades are mounted in the recessed heels for reinforcement and support against cutting. An anvil is disposed in a cutting nip of the rotors having hardened cutting edges. The anvil is mounted by means of journal bosses so that it may be rotated during assembly so that the cutting edges of the rotor blades and anvil are precisely parallel and aligned before welding. Sieve screens carried closely adjacent the rotor surfaces control the size of the product. A first cutting of the material occurs between opposing blades of the two rotors prior to reaching the anvil, a second cutting occurs between the blades and the anvil, and a third cutting occurs between the cutting blades and the screens after passing the anvil.

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First Claim