Importantly, manually digging out the crusher before repairs or restarts puts workers in dangerous positions. The Mine Safety and Health Administration (MSHA) has reported numerous injuries and fatalities incurred when climbing in or under the jaw to manually clear, repair or adjust the typical older-style jaw crusher.
As such, a welcome market entry is that of modern crusher design, derived from a major impetus to put safety first while also meeting demand for far greater productivity and ease of maintenance. A recent example is the newly designed Telsmith 3258 jaw crusher, a model engineered with innovative hydraulic systems that handle all of the 'heavy work,' maximizing uptime and eliminating the need for maintenance personnel to climb into or under the jaw.
The hydraulic chamber clearing system on the Model 3258 jaw automatically opens the crusher to a safe position, allowing materials to pass. Its hydraulic relief protects parts and components against overload damage, and its hydraulic adjustment reduces maintenance time and maintains safe, consistent crusher output without the need for manual intervention.
How is Hydraulic chamber cleared:
Whether a crusher is jammed by large material or uncrushable debris, or stalled by a power failure, the chamber must be cleared before restarting. Manual clearing is a lengthy and risky task, especially since material can be wedged inside the crusher with tremendous pressure, and dislodging poses much danger to workers placed in harm's way inside the crusher.
Unlike that of the older-style jaw, the Model 3258 jaw clears itself automatically with hydraulics that open the crusher to a safe position and allow materials to pass. If a feeder or deflector plate is installed under the crusher, uncrushables will transfer smoothly onto the conveyor without slicing the belt.
To prevent crusher damage, downtime and difficult maintenance procedures, the hydraulic overload relief system opens the crusher when internal forces become too high, protecting the unit against costly component failure. After relief, the system automatically returns the crusher to the previous setting for continued crushing.
A Jaw Crusher reduces large size rocks or ore by placing the rock into compression. A fixed jaw, mounted in a 'V' alignment is the stationary breaking surface, while the movable jaw exerts force on the rock by forcing it against the stationary plate. The space at the bottom of the 'V' aligned jaw plates is the crusher product size gap, or the size of the crushed product from the jaw crusher. The rock remains in the jaws until it is small enough to pass through the gap at the bottom of the jaws.
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