Precautions for replacement of wear parts of jaw crusher
In the jaw crusher, the liner, thrust plate and eccentric shaft are the main wear parts. The service life of the jaw crusher wear parts is shown in the figure below. The following introduces the precautions for the replacement of these wear parts.
1. Replacement of liner
The fixed jaw lining plate (tooth plate), movable jaw lining plate (tooth plate), and both side lining plates (guard plate) of jaw crusher are * easily worn out. If the abrasion is severe, the particle size of the product will increase. When the liner is initially worn, the liner can be turned around, or the upper and lower parts can be turned around. The wear of the jaw plate is *ly concentrated in the middle and lower parts. When the tooth plate is worn out by 3/5, a new liner needs to be replaced. When the lining plates on both sides wear out by 2/5, they also need to be replaced.
2. Replacement of mandrel, eccentric shaft and bearing bush
If there is not much shaft wear, and you just want to repair the geometric shape, you can turn it on a lathe, but when the journal size is reduced by 5% compared with the original after several turnings, it is not allowed to turn again and should be replaced with a new one. Since the jaw crusher works under impact load, the babbitt alloy lining on the bearing bush needs to be recast every two years.
If the eccentric shaft and the bearing bush, the mandrel and the bearing bush are worn, and the gap is greater than 1.5 times the original assembly clearance, it needs to be adjusted or replaced; the oil groove is worn 1.5 mm, the oil groove should be reopened and adjusted; the upper cover of the connecting rod head When the gap between the eccentric shaft and the eccentric shaft is worn to more than 1.5 times the assembly gap, it is also necessary to add pads for adjustment or replace with a new one.
3. Replacement of thrust plate
When the thrust plate is severely worn or the front thrust plate is broken, the ore in the crushing cavity must be removed *, the severely worn or broken thrust plate must be taken out, and the movable jaw and the toggle plate on the connecting rod must be checked for damage. Then pull the movable jaw to the vicinity of the fixed jaw, lubricate the working surface of the toggle plate with dry oil, replace it with a new thrust plate, make it slowly contact the working surface of the toggle plate, and tighten the horizontal pull rod to make the movable jaw handle thrust The board is clamped. Tighten the safety cover, connect the lubrication system, and then adjust the size of the discharge port.