HM12-D concrete mixer trucks are made to transport and mix concrete up to the construction site. They can be charged with dry materials and water, with the mixing occurring during transport.
They can also be loaded from a "central mix" plant, with this process the material has already been mixed prior to loading. The concrete mixer truck maintains the material's liquid state through agitation, or turning of the drum, until delivery.
The interior of the drum on a concrete mixer trucks trailer is fitted with a spiral blade. In one rotational direction, the concrete is pushed deeper into the drum. This is the direction the drum is rotated while the concrete is being transported to the building site. This is known as "charging" the mixer. When the drum rotates in the other direction, the Archimedes' screw-type arrangement "discharges", or forces the concrete out of the drum. From there it may go onto chutes to guide the viscous concrete directly to the job site.
If the self loading concrete mixer trucks cannot get close enough to the site to use the chutes, the concrete may be discharged into a concrete pump, connected to a flexible hose, or onto a conveyor belt which can be extended some distance (typically ten or more metres).
A pump provides the means to move the material to precise locations, multi-floor buildings, and other distance prohibitive locations. Buckets suspended from cranes are also used to place the concrete. The drum is traditionally made of steel but on some newer trucks as a weight reduction measure, fibreglass has been used.
Models and Technical Specifications
|Residual Ratio of Discharging||<=0.5%|
|Water Supply System||Air Pressure|
|Water Tank Volume||400L|
|Clutch||430 Monolithic dry type|
|Min Ground Clearance||245mm|
|Engine Max Output Power||340kw|
|Emission Standard||Euro ||||