A drum mixing machine is the device that creates the sound of percussion instruments such as cymbals, drums, and maracas. Normal drum mixers consist of drum pads that contain the drum heads. Other types of drum machines include those that have a pre-set or preset pattern of sounds, called pre-recorded sounds. Also available are drum machines that use solid state controls. Drum machines are often used in music studio recording studios.
A tumbling drum mixer (or commonly known as a non-tumbling drum mixer) is an automated type of drum mixer that creates concrete on-the-spot using a set of inbuilt hard-wearing steel balls. The drum head rotates around its fixed axis as different materials are loaded into a drum sock at one end of a drum and then exit through another vent hole at the other end. Once all the material has been loaded, the drum head will rotate on its axis at high speed to apply the concrete powder. As the drum gets heated, it will continue to rotate until the heat builds up enough pressure to escape through the drum head vent.
A line out of a drum mixer consists of a pair of discharge tubes attached to an aluminum tube. The discharge tubes enable the mixer to control the amount of air or other fluid that is flowing through the system. A high efficiency mixer will have an aluminum tube with a complete inner wall that has several discharge ports. Most of these units will have both a valve and a control for the discharge.