♦ The wear failure reasons and solutions of swing and fixed jaw plates
Mainly shown in the middle and bottom parts of jaw plate, especially 1／3 point is the most serious wear, the upper part is less wear. After the tooth profile of the plate surface flatted, it will lose the crushing ability and can't be used.
(1) Reason Analysis
Swing and fixed jaw plates wear is normal, but the jaw plate wear failure in a short period of time, which is not normal. Main reason basically has:
① The material properties such as brittleness, hardness, feed particle size, density, etc shall be changed, but the crushing opening can not be adjusted in time;
② The door angle of the swing jaw plate and the fixed jaw increases, more than the normal range (18°-22°);
③ The speed of eccentric shaft is too fast, the swing jaw plate swings too many times and the crushed material is too late to full discharged, which cause the crushing chamber blocked and speeds up the jaw plate wear;
④ The inadaptation of jaw material, poor its own strength, abrasion resistance and impact resistance or the contact surface of jaw plate and frame is not smooth.
(2) The solutions
① Sampling inspection for each batch of material, if found significant fluctuation of material properties, adjust main parameters of crusher such as forceps angle, eccentric shaft speed, capacity and motor power, etc. Make adjustment to reduce plate wear and tear.
② Pay attention to tighten the new jaw plates, and ensure the contact surface of jaw plates (swing and fixed)and frame is smooth. A layer of better plastic material should be underlaied between two surfaces. Assembly requirements for swing and fixed jaw plates is teeth peaks of one jaw plate aligned with tooth space of another jaw plate, namely swing jaw plate and fixed jaw plate be in the basic meshing state.
③ Cast jaw plates with high hardness and toughness material. Generally, jaw plate is made into symmetrical shape, the less-wear lower plate can still be used when turn it upside down in maintenance. Jaw plate of large jaw crusher is made of several plates which can be used interchangeably to prolong the service life of jaw plates.
④ For the worn jaw plates, jaw teeth can be restored by overlaying method.
♦ Spare parts of jaw crusher – reason of bearing heating
① Oil pipes are plugged, it causes poor lubrication oil flow.
② Pipeline leak causes insufficient supply pressure.
③ Lubrication oil is dirty mixed with sundry.
④ The clearance between bearing and axial is too narrow.
⑤ Lubrication oil is not appropriate, particle size is too big or too small.
⑥ In the winter, the oil temperature heater is not yet opened before starting, oil is too sticky.
⑦ In the summer, lubrication oil from the oil pump do not flow through the oil cooler, or oil cooler breaks down, such as water pipe plug, water break.
⑧ Bearing cooling water circulation device breaks down, such as plugging, etc.
⑨ Outlet size is too small (thrust plate is too long),which causes large eccentric shaft force.
⑩ Drive belt pull too tight, causes large bearing load.