Non-tilting Type Concrete Mixer:

Non-tilting Type Mixer (NT) consists of a cylindrical drum that rotates about a horizontal axis and does not have the tilting facility. The vanes are fixed inside the drum surface. The drum is provided with two central openings at the opposite ends. Feeding of the ingredients is done by front opening and discharging of mixed concrete by rear opening. For discharging the mixed concrete, the inclined chute is introduced into the drum at rear opening end with the help of a lever. This type of concrete mixer is shown in Figure.

It has been observed that in this type of mixers the rate of discharge is slow and chances of segregation are more as compared to tilting type mixers. The capacity of these mixers is generally higher than that of the tilting type mixers. As per  IS : 1971 - 1968, the size/capacity of non-tilting type mixers are available as 200 NT, 280 NT, 340 NT, 400 NT and 800 NT, while 'NT' represents the non-tilting type mixer and numeric data represents one batch capacity in litres.

Figure: Non-tilting Type Concrete Mixer

Reversing Drum Type Mixers (R) are similar to Non-tilting Type Mixer (NT), i.e. with a cylindrical drum, which rotates about a horizontal axis and does not have the tilting facility. The just one difference is in the discharging mechanism. In reversing drum type, the mixed concrete is discharged from the rear end opening by rotating the drum in reverse direction. The capacities of these mixers available are 200 R, 280 R, 340 R and 400 R, where 'R' represents the reversing drum type mixer and numeric data represents one batch capacity in litres.