This machine is double-horizontal-shaft concrete mixer, which is designed and manufactured according to Concrete Mixer GB /T9142-2000. It is applicable to the medium or small scale factories producing precast elements, the projects of road, bridge, irrigation works, dock, and civil construction. It can mix the concretes of hard rigid, soft, fluid or light weight aggregates and various mortars as well. The comparative table of its mixing ability and slump constant refer to appendix I. In addition to being used independently, the machine can constitute a mixing plant with HP2400 Series batching machines. It can be also used as the main engine of a mixing plant.