... the structure is compact, the main body of the machine is short .center of gravity core is low , ... of Φ700x550 or Φ750x550 can both be used in the machine,the cutting speed is good when it mines ... of cantilever type partly section roadheader, it is used in tunneling of roadway when the roadway section ... road or half coal rock . it can also used in railway ,highway, water conservancy for the tunneling ...