Testing of the PK-7 combine at the mine No. 3 of the Leningradslanets Trust.
Abstract
The tests were carried out in 1965 to determine the efficiency of destruction of layers of industrial oil shale stack by the executive body of the combine, which is a milling-type cutting crown. The rotation speed of the crown is 58 r/min from the electric motor KOF‑22‑4k (25 kW). Rotation of the crown in vertical and horizontal planes and feed back and forth (0.5 m) are carried out by hydraulic cylinders. Two hydraulic jacks provide the combine's support between the roof and the floor. The hydraulic jack pumps are driven by the second electric motor KOF‑22‑4k. Thus, the total installed power of the motors for rotation and feeding of the crown is 50 kW.
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