Method and apparatus for monitoring the operation of a reciproca

Details Method and apparatus for monitoring the operation of a reciproca Method and apparatus for monitoring the operation of a reciproca

1978-12-20

1981-02-24

Spruill, R. L.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164151, 164153, 164314, 425154, 425171, B22D 200, B22D 1732

Patent

active

042521742

ABSTRACT:
A method and apparatus for monitoring the operation of a reciprocating liquid injection unit wherein charges of an injection liquid, such as molten metal, are injected one-by-one to a point of consumption, such as an injection molding die, by an injection plunger reciprocating in a sleeve and driven by a double acting hydraulic cylinder and fluctuations in the oil pressure on the return side of the hydraulic cylinder are monitored to detect abnormal increases in such pressure which indicate the occurrence of dragging between the injection sleeve and the plunger head.

REFERENCES:
patent: 2950501 (1960-08-01), Harkenrider
patent: 3078515 (1963-02-01), Wintriss
patent: 3330003 (1967-07-01), Eggenberger et al.
patent: 4029122 (1977-06-01), Jaegtnes

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