a drive gear 23 a with a larger diameter than the screw gear and a higher tooth count this drive gear 23 a receives the drive chain 24 that delivers the power from the motor 39 s drive sprocket 25 the hydraulic motor secures to the leg 3 a and the left bottom 6 a as shown the enclosure rests upon the other legs 3 and the base 2 fig8 a provides an alternate embodiment of the driving mechanism where the left mixer connects to its sprocket 20 and the right mixer to its sprocket 21 outwardly of the front panel 17 the two sprockets have the largest diameter as shown the sprockets rotate by the action of the chain 22 or other flexible elongated member in opposite directions the opposite rotation occurs as the chain 22 passes upon a first idler pulley 26 located upon the front panel between two shelves 17 a towards the left side panel 15 above the left sprocket 20 and outwardly from the center of the left sprocket also keeping tension in the chain or other flexible elongated member a second idler pulley 27 has its position upon the front panel beneath the left sprocket 20 inwardly from the center of the left sprocket and the first sprocket the chain continues to a third idler pulley 27 a partially shown in this figure behind drive gear 23 of the conveyor the three idler pulleys have sufficient biasing strength maintaining the chain 22 taut during initial mixing of material.