Easy restoration work during jamming of foreign matter (Crusher protection mechanism)

The special lock cylinder mentioned above has a different structure and functions compared to the normal hydraulic cylinder and the cylinder tube and piston have an interference fit structure. They are normally tenaciously locked to disable expansion and contract even if an external force is applied.

      On the other hand, when the lock cylinder is operated, the cylinder tube is expanded by pressurizing oil in unlock port to expand and retract as in the normal cylinder.

      For this reason, the cylinder contracts by reaction force and the movable teeth move from Position (1) to Position (2) in Fig. 8 to prevent damage to the frame, bearing, shaft or other components.

      In restoration work, the cylinder is operated and the movable teeth are moved from Position (2) to Position (3) in Fig. 8, to further expand the tooth tip clearance to release the jamming of the foreign matter. The foreign matter is then dropped onto the crusher and is removed onto the conveyer.

      The fed raw material filled to the capacity on the foreign matter can continually be crushed and ejected, allowing resumption of operation .

      During normal operation, the lock cylinder is locked and outlet clearance is adjusted by actuating the lock cylinder in the foregoing operation procedures.

      The locking force is set by multiplying the load during crushing by a preset safety factor and the cylinder does not expand or contract by an external force and the tooth tip clearance does not vary.

      If a metal lump or other object is fed by error and is jammed tenaciously in tooth tips, suddenly stopping crusher operation, the reaction from the movable teeth to the cylinder will become an anomalous load greatly surpassing the set load mentioned above, far exceeding the cylinder lock force.

2)  Easy removal of jammed foreign matter

      During crushing of concrete waste, reinforcements mixed in concrete waste sometimes pass the crusher and remain on the  underneath the crusher to block the conveyor movement.

      If this happens, operation is temporarily shut down, the ejection chute under the crusher is removed, blocked reinforcements and other foreign matter are removed through the opening and the area is cleaned.

      To simplify this work, the carrier roller is eliminated and wear plates are provided, to lower the height of the track shoe and to increase the dimensions of the opening for easy accessing (Fig. 9).

3)  Anti-slipping

      Anti-slip sheets similar to emery paper and small bumps are provided

in places where the operator climbs onto the crusher during checks and maintenance work, to enhance the safety and durability of anti-slip sheets .

4)  Centralized greasing

       Grease nipples in the bearing part in the crusher operation section and in the pin bush part totaling 12 are put together in one place, to facilitate greasing during checks and maintenance work.

A centralized operation panel incorporating the multiple-function monitor mentioned above and switches is installed in the lower part of the machine body to facilitate machine ope-ration and monitoring from the ground .

       Operation monitoring system by multiple-function monitor A multiple-function monitor is equipped inside the operation panel and display of the crusher outlet clearance mentioned above and an adjustment operation function have been added. The functions to display machine operation status, as well as problem location and status in the case of an anomaly, have been reinforced.

       One example of monitor display is illustrated in Fig. 12.