... all kinds of concrete ,and the gravel, it has the below functionsReasonable struction , good mixing quality ... air valve , melt break implement, hot relay, it has the short circuit ,overload, protecting functions The ... ,50ton , 100ton, 150ton, 200ton, 250ton, 300ton . it is made up of hopper , leg , input tube , ... spiral conveyer has two types , cement one or coal ash one. It can be used to deliver the ...