Pneumatic hammers such as and repairs
When the hammer head rises, it does not drop or strike, the energy is insufficient, and the hammer head drops rapidly. The upper part of the piston gas pressure and the falling part weight can be overcome, and it is much larger than the resistance and friction force of the lower part of the piston. Therefore, the reason why the hammer head does not drop or does not strike is related to the pressure of the upper piston, the resistance of the lower part of the piston and the magnitude of the frictional force:(1) the upper part of the piston gas pressure is too small (such as airway blocked, spin valve leakage and other reasons), the hammer piston pressure is insufficient, hammer blow to.(2) the lower part of the piston is too big resistance (such as the rotary valve dislocation, make small opening or not open because of the airway), lead to the gas channel is blocked or blocked, will reduce the impact force or hammer down.(3) the friction is too large, such as the hammer rod is upsetting, although the hammer has improved, but there may be stuck down. If the working piston ring broken, broken part ejection, insert inlet, hammer may be stuck down. In addition, there may be a wedge from the upper anvil, hammer down.(four) hammer guide sleeve connection stud bolts broken hammer guide sleeve and the cylinder has broken because the nut loose, resulting in uneven loading of the bolt, or because the anvil sink or the upper and lower anvil height is not enough, the working piston directly caused by hitting the guide sleeve.
When the hammer head is not high, the suitable lifting position should be on the upper anvil block, the working surface is higher than the lower surface of the guide sleeve, and not lower than the guide sleeve of the hammer head. The reason why the hammerhead is not high is mainly as follows:(1) the pressure in the lower chamber of the compression cylinder is lower than that of the work. Thus, the hammer can not be pushed up.(2) compressed gas leakage, the main reason is because the wall wear and gas from the compression chamber cylinder chamber to leak into the inferior vena cava, the guide sleeve or leaking out, or from the rotary valve ball check valve leak caused.(3) the working cylinder guide sleeve is skewed, the lower part of the hammer rod is upset, and the wedge wedge of the upper anvil is pulled out, and the hammer head can not be lifted well.
Air hammer commonly used trouble shooting(1) the main reason for the failure of the hammer rod piston on the upper cover of the working cylinder is the following:(1) the nut of the work cylinder head is loose or the upper cover gasket is damaged and the air leak is caused, and the air pressure in the cavity is insufficient. Therefore, tighten the nut or replace the gasket in time.(2) the steel ball of the ball check valve is not tightly jointed with the hole seat, or the steel ball is not round or broken, and the air leakage is caused. Therefore, the replacement of new steel balls, new springs and so on.(3) the piston top surface of the plug for shock, vibration and loose, the air enters the hollow hammer rod, causing gas pressure is insufficient. Therefore, the cover should be repaired in time, so that the cap and the hammer hole should be used as pressure fit, and then riveted.(4) the hammer rod piston top surface of the top surface of blisters, pores, cracks caused by leakage, also can make the air pressure is reduced. It can be solved by the method of repair welding.(5) the upper airway to the top of the rigid cylinder is not enough, and the air pressure in the cavity is not enough. Gaskets can be added to the top of the work cylinder.
