Twin Shaft mixing cycle

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Twin shaft mixing cycle

Recommended timing to give the fastest mixing

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Although the total cycle time is dependent on the speed at which the charging takes place as well as the type of concrete being produced, typically Ocmix twin shaft mixers can produce a batch of wet cast or ready-mix concrete in less than 90 seconds, with dry-cast, block and paver mixes taking a little longer, although we do not recommend twin shaft mixers for dry-cast concrete due to buildup on the shafts. Note that some admixtures require extra mixing time. The diagram below assumes that the aggregates are waiting in a skip or hopper, ready for discharge. Note the Premix time before water is added; this is essential to proper mixing and fast mixing times. The short total cycle time allows many plants to be upgraded to give double the output by replacing the mixer only, compared with adding a second mixer, which requires extra conveyors, chutes, holding hoppers and often an increase in elevation of bins and weigh hoppers.

Wet cast cycle (typical). Dry cast not shown - we recommend Planetary for all dry cast applications

Charge aggregates	5s							Refill
Charge cements		15sec							Refill
Premix time			20 sec							Premix
Charge water				20 sec							Refill
Charge admixes	Air			Other				Refill			etc.
Final mixing time					20 sec.
Discharge time						8 sec
Door close							2s
Total cycle time	Beginning to end = 90 seconds

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