| 摘要 |
mining and construction industry, in particular, equipment for punching holes in brick and concrete blocks. SUBSTANCE: punch has engine, toothed reducer, and percussion-rotary unit with hollow shaft, with mentioned parts of punch being arranged in succession. Percussion-rotary unit casing is composed of base mounted on toothed reducer, head for receiving tail part of tool spindle, and connecting pins. EFFECT: reduced material usage, simplified manufacture process, reduced heating due to percussion interaction between punch parts. 2 cl, 1 dwg
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