Tests of the Ural-33 shearer during limestone undercutting.

Abstract

At Slantsy plant in 1965 an experimental cut was carried out on the upper part of the limestone “slab” layer, where there is a 0.04 m thick interlayer of clay shale with lower strength. At the total height of the cutting slot of 115‑120 mm, the destroyed part of the limestone was 75‑80 mm, and 40 mm were in the clay shale interlayer. The cutting was made by the Ural‑33 cutting machine mounted on skids above the scraper conveyor, with a bar length of 2 m and a non‑standard seven‑link chain. The useful depth of the cut was 1.7 m. The machine was operated at a reduced cutting speed (1.6 m/sec) with I‑80 cutters, whose back angle was increased from 5 to 15°.

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