Pick For Earthworking Machine

Abstract

A pick to be used on an earth working roll for mining, construction and public works machines such as crushers, surface miners, milling machines and the like. The pick includes a working end with holes that extend into the pick and inserts are received into the holes. The inserts during operation impact and fracture a consolidated material to separate the material. Impacting the material generates heat in the pick at the working end of the pick which must be dissipated and attenuated to limit thermal fatigue in the inserts that occurs at high temperatures. The inserts in the working end are configured to dissipate the generated thermal energy from the inserts to the body of the pick.

Description

FIELD OF THE INVENTION[0001]This invention relates to a cutter tool, primarily for use in mineral winning, such as coal mining, but also usable for other underground purposes such as tunnel or roadway driving, or above ground for civil engineering works such as road planing and trench cutting, whether with drums or endless chains, both on land and underwater.BACKGROUND OF THE INVENTION[0002]A number of machines involved in mining, construction and public works use rolls or drums that are driven for the crushing, mining, milling and the like of earthen materials. These earth working rolls or drums include an array of pick assemblies to engage and separate a consolidated material into smaller portions that can be further separated in subsequent operations. A pick assembly may include a pick releasably attached to a holder secured to the drum or roll. The pick includes a head configured to contact the material and separate it. The picks are wear parts that are replaced after a certain ...

AI Technical Summary

Benefits of technology

[0011]In a second embodiment the elongate inserts are parallel to each other in the head along their length. Preparing the head of the pick to accept parallel inserts is a less complex and lower cost process than other configurations and the closely spaced tips impacting the material work more efficiently than a single large tip.

[0012]In a third embodiment the holes with inserts are spaced apart in the head of the pick and the inserts converge toward the face to a closely spaced co

Problems solved by technology

In operation, the impact of the tips can generate significant heat.

Dissipation of this heat is critical as the carbide tips are subject to thermal fatigue when they consistently reach or operate at high temperatures.

Inefficient operation of the picks due to damage or wear can also generate excessive heat, raising the temperature of proxi

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