First of all, the forging workshop of the forging factory connects the power supply, starts the air hammer through the handle or pedal rod, controls the upper and lower rotary valves, and enables the air hammer to be idled, the hammer head suspended, the continuous strike and the single blow four actions. To meet the needs of various forgings processing. (1) when the lower valve handle is in the vertical position and the middle valve control handle is in the "air" position, the lower chamber is directly connected to the atmosphere and the pressure becomes consistent, as there is no compressed air entering the working cylinder, Therefore, the hammer does not work. (2) when the upper chamber of the working cylinder and the compression cylinder are connected with the atmosphere, the upper cavity of the working cylinder and the compression cylinder are connected with the atmosphere when the lower valve handle is in the vertical position when the hammer head is suspended and the handle is in the vertical position. At this point, the compressed piston goes up and the compressed air enters the atmosphere; the compressed air enters the lower chamber of the working cylinder from the air chamber through the air chamber, and the hammer head rises and is placed in the suspended position.
When the valve handling handle is in the "working" position, the lower valve handle (or pedal rod) rotates counterclockwise so that the compression cylinder, the lower cavity and the working cylinder are connected with each other. When the compression piston moves down or up, the compressed air in the lower or upper chamber of the compression cylinder shall enter the lower or upper chamber of the working cylinder accordingly, lifting or falling the hammer head. In this cycle, the hammer produces a continuous blow. The energy of striking forgings depends on the upper, lower valve rotation angle, the greater the energy of striking forgings. (4) the single strike is realized by changing the operating position of the handle. Before a single forging strike begins, the hammer is in a suspended position at the hammer head (that is, the middle valve handle is in the "working" position and will then be up, The control handle of the lower valve rotates from the vertical position to a certain position quickly and slowly to the original vertical position (or changes the position of the pedal rod accordingly) and then gets a single blow. The magnitude of the strike energy varies with the angle of rotation to 45. Time single strike energy. If the handle or treadle is kept in an inclined position (rotation angle < 45 °), the hammer is continuously struck. Therefore, a single strike is in fact only a special case of continuous strike forgings.