The forward-backward swing of machine crossbem is driven by motor and parallel shaft reducer,guided with the oil-immersed linear guide,good lubrication effect, small running resistance, and the energy consumption is reduced, Drived with high-precision double-cylinder, makes the lifting movement more stable. It adopts new spindle box structure, main parts adpot the high-quality materials.The Sealing device which is designed especially for the harsh stone processing environment, is with waterproof, dustproof and oil-proof; therefore, it has the advantages of high stability and long service life.