It's a machine that produces hollow blocks using pressure and vibration. In modern construction practices, bricks are categorized according to materials used to form them and the method of production. Under this classification, there are five common types. Categorizing Bricks by Raw Materials: Burnt clay bricks.A hollow block machine is a machine that produces hollow blocks using pressure and vibration to compress the concrete mortar into the molds and form the concrete blocks.The concrete block machine uses pressure and vibration to form different kinds of concrete blocks by using different moulds. The machine is then pressed with high pressure so that well- made cement, hollow and pavement blocks are manufactured.