process and equipment for the operation of a large underground in the mines.

摘要

925,786. Mineral - mining equipment. GEWERKSCHAFT EISENHUTTE WESTFALIA. March 7, 1962 [May 19, 1961], No. 8762/62. Class 68 (1). In an hydraulic circuit for a mineral-mining installation in which the winning machine 11 is hauled to and fro along a conveyer 10 and the conveyer 10 is driven by independent hydraulic motors 14, 16 of the same output capacity, the supply of pressurized hydraulic fluid to the circuit is from a high pressure, low volumetric output pump 19 and a low pressure, large volumetric output pump 18. The manner of flow of the pressurized hydraulic fluid through the circuit is regulated by a multi-way slide valve 24 to allow either the speed of advance of the winning machine in the conveying direction of the conveyer to be less than that of the conveyer or said speed to be greater than that of the conveyer, the speed of which is also increased, when the machine is moving against said conveying direction. Such speed adjustments facilitate uniform loading of the conveyer.