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 cannot be adjusted in time;
② The 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 For the worn jaw plates, jaw teeth can be restored by overlaying method.
② 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.
③ 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.
④ 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.
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