System for changing the hammers of a shredder and relative method
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsAlessio GIACOMEL, Davide BRAGA
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Abstract
The invention relates to a system for changing the hammers of a shredder including a shredder with one or more covers and a rotating drum equipped with a plurality of hammers; a lifting system suitable to move said hammers and a control unit which controls both the opening of the shredder and the movements of the lifting system and preferably also the unlocking/locking of the hammers from/on the drum to allow their replacement. The system can be managed hydraulically with a single hydraulic supply. It is included to be able to control the system remotely or to include its automation according to a maintenance plan. A relative method for changing the hammers of a shredder is also disclosed.
Claims10
A system for changing the hammers of a shredder comprising:
- (a) a shredder which in turn comprises
- (a1) a housing which defines a shredding chamber and which is equipped with one or more covers, and optionally drive rotors to drive the material to be shredded, which can be lifted and lowered by means of relative lifting devices, in particular hydraulic lifting devices;
- (a2) inside said housing a rotating drum equipped with a plurality of hammers;
- (a3) a first control system to control said lifting devices;
- (b) a lifting system, preferably hydraulically operated, suitable to move said hammers by means of a second control system in order to control the movements of said lifting system;
- (c) a control unit which controls both the first and the second control system.
A method for changing the hammers of a shredder comprising the following steps:
- (i) providing a shredder with a rotating hammer drum and a lifting system of the hammers and a locking/unlocking device to block/unblock said hammers to/from said drum;
- (ii) opening said shredder;
- (iii) unlocking at least one hammer with said locking/unlocking device;
- (iv) operating said lifting system and extraction of a hammer at least partially worn from said drum;
- (v) alternatively
- (v-1) removing a completely worn hammer from said shredder, preferably placing it in a storage device, and providing said lifting system with a new hammer, preferably taken from another or said storage device and inserting said new hammer into said drum in the vacant position;
- or
- (v-2) repositioning of a partially worn hammer in the vacant position in said drum so that its working faces are in a different position from the one before extraction;
- (vi) locking said new or repositioned hammer with said locking/unlocking device;
- (vii) repetition of phases (iii) to (vi) for each hammer to be replaced or repositioned or of phases (iv) to (v) if in phases (iii) and (vi) several hammers are unlocked and locked at the same time;
- (vii) closing the shredder;
- wherein phases (ii) to (viii) are controlled by a single control unit, which is preferably controlled remotely, and are preferably managed by hydraulic mechanisms, preferably powered by a single hydraulic power unit.
Dependencies are inferred from the claim text.