SPC400 truck mounted water well drilling rig mainly dial rotary drilling, could be available in clay, sand, gravel, rock and bedrock.
    Flushing fluid to achieve positive circulation drilling. SPC400 truck mounted water well drilling rig can realize gas lift reverse circulation drilling with double wall drill; SPC400 drilling rig can realize air DTH hammer drill with DTH hammer drill, air compressor and dial reducer; SPC400 drilling rig can realize foam drilling with foam pump; PC-400 drilling rig can realize short auger drilling with short spiral drill.
   During the initial process, pressurizing the drilling tools by pressure mechanism could help increase shallow hole drilling efficiency. Until the drilling tools weight is more than the essential pressure, decompression drilling should be used.
   The rotary drilling openings the early auxiliary pressure drilling to improve into the hole drilling efficiency, with the hole depth increase when the weight of the drill exceed the necessary that add the pressure of the drilling can realize drilling currently decompression.