The Tumble Blender comprises a freestanding steel framed structure with a trunnion-mounted rotating cage to hold the IBC. The IBC is loaded into the cage by a forklift truck. As it is lowered down into the cage, the Cone Lock device at the bottom of the cage automatically locks the valve in place. The truck and operator exit the blender enclosure, lock the access gate, remove the interlock key and insert it into the control panel. The start button is pressed; the clamping system operates to clamp the IBC in the cage. The cage then rotates at a predetermined speed and duration (optimum speed and blend duration and time found on commissioning).There are safety interlocks to stop the process if either the clamps slacken or the valve clamp releases. The door is interlocked closed to prevent entry during operation. The main drive motor is controlled by an inverter controller which starts and drops the process by gradually running up and down to full speed. This is a vital feature to minimize the torque and torsional stresses on shafts, cage, and support structures.