In order to make the material into solid briquettes under high pressure, a pre-compression screw device is used to force the material to be formed into rollers. Due to the constant speed and reverse rotation, the material is compressed and formed. The unit pressure is from small to large until the centerline of the pair of rollers "0-0" When the molding unit pressure reaches its maximum value.

As the rollers continue to rotate, the molding pressure continues to decrease, and enters the ball-off state until the ball is off. Among them, the main engine is powered by an electromagnetic speed regulating motor, which is transmitted to the driving shaft through a pin coupling through a belt pulley, a cylindrical gear reducer. The driving shaft and the driven shaft are ensured to run synchronously through open gears. A hydraulic device is installed behind the passive bearing seat. The screw feeding device is driven by an electromagnetic speed-regulating motor, and is rotated by a belt pulley and a worm reducer to force the pressed material into the feed inlet. Due to the constant torque characteristics of the electromagnetic speed-regulating motor, when the quantity of material pressed by the screw feeder is equal to the quantity of material required, a constant feeding pressure can be maintained to stabilize the finished briquette quality.

If the feeding quantity is too large, the electric power of the feeding device will be overloaded; if the feeding quantity is too small, the ball briquettes will not be formed well. Therefore, skilled operation techniques play an important part to ensure the normal operation of the energy-saving ball press. The hydraulic protection device uses a hydraulic pump to drive high-pressure oil into the hydraulic cylinder, causing the piston to produce axial displacement. The front joint of the piston rod rests on the bearing seat to meet the production pressure requirements. When there is too much feed between the two rollers or metal blocks, the piston rod of the hydraulic cylinder will be overloaded, the hydraulic pump will stop working, the accumulator will buffer the pressure change, the overflow valve will open to return oil, and the piston rod will shift enlarge the gap between the rollers so that the hard objects can pass through the rollers, and the system pressure will return to normal level, which can protect the rollers from damage.

In addition, the briquetting machine is also used for pelletizing and agglomerating non-ferrous and ferrous metal powders, which can be directly smelted into the furnace to increase the added value. All metallurgical industry waste materials needed smelting into the furnace, all need to be compressed and briquetted by a ball briquette press. Commonly the applicable materials are burnt dust ash, sludge, oxide scale, steel slag, iron ore fines, aluminum ash powder, silicomanganese powder and so on.