(1) cutting tool in cutting efficiency of the sand, sand gravel strata, namely how to reduce the cutting resistance, ensure the liquidity of cutting soil.
(2) by the changes of shape of cutting tool, reducing drivage wear, the durability of the tool.
(3) to adapt to the needs of urban construction prosperous area as much as possible to reduce the knife rotating cutter cutting process of soil disturbance to the surrounding soil and the environment, such as vibration, noise, etc.