... 4.Easy maintenance HJK-50 Clay brick making machine,Double stage vacuum extruder This machine is used to produce solid bricks and hollow ... .Main Use of Fired and Energy-saving Clay Brick Machine Supplier: The machine applies to clay, shale, coal gangue, fly ash, ... Pictures: If you have any question about the machine,please contact with me. HJK-50 Clay brick making machine,Double stage vacuum extruder