JS500 Concrete mixer is double shaft compulsory mixer, it has double advantages: To be operated independently as single, and to be combined with PLD series compounding machine to form simple concrete batching plant, it can provide associated main machine for batching plant, and is applicable to road, bridge, irrigation works, dock and civil building project, it can mix hard concrete, quaking concrete, fluidity concrete, light weight aggregate concrete and various kinds of mortar, it is a kind of high efficiency model and is used widely.