Repair method of movable jaw of jaw crusher

During normal jaw crusher production, the movable jaw of a jaw crusher may suddenly break. This can significantly impact production progress and easily cause significant losses. Therefore, it's important to understand common jaw crusher malfunction solutions. Today, we'll focus on the causes of breakage and their solutions. Common scenarios include the following:
1. The movable jaw's casting process was substandard during production, resulting in serious defects such as dense air holes. This is due to structural issues within the movable jaw itself, so it should be replaced promptly.
 
2. Substandard toggle plates and toggle pads were used. In this case, in addition to replacing the movable jaw, the manufacturer's original toggle plates and toggle pads should also be replaced.
 
3. When the jaw crusher encounters unbreakable material, the impact pressure increases, and the toggle plate fails to function as a self-breaking protection, transferring the powerful force to the movable jaw. In this case, the movable jaw needs to be replaced and the unbreakable material removed.
 
4. The movable jaw has shifted during operation, causing the bottom to collide with components such as the frame guard. At this time, the movable jaw needs to be replaced, and the position and connection of the eccentric shaft, bearing, locking bushing, and movable jaw need to be adjusted. Damaged parts should also be replaced.
 
5. The tie rod spring is failing. You need to replace the tie rod spring or adjust the tension of the tie rod spring.
 
6. Improper feed position or feeding method may cause the movable jaw to break. In this case, we should ensure that the material is fed evenly and smoothly while the jaw crusher is operating, and use the feed hopper to reduce the impact of the weight of the free-falling material on the movable jaw.
 
Of course, if the cost of replacing parts is too high, welding repairs are also possible. Most cracks in the movable jaw occur above the toggle plate seat. First, clean the suspected cracked area with kerosene, then apply white powder. Wait a few moments for the crack to appear. Then, drill a 6mm round hole at either end or the inner end of the crack. The hole depth should be no less than 1.1-1.3 times the crack depth. Select appropriate welding rods and welding grooves. Preheat the area around the weld to about 300-600 degrees before welding. Add repair steel plates if necessary. If the movable jaw is broken, use "X" welding, with a 45-degree groove on each side. After welding, the movable jaw size should be consistent with the original size.
 
ZHENGZHOU YIHONG INDUSTRIAL EQUIPMENT CO., LTD. is a trusted international supplier of crushing equipment and wear parts. We provide high-performance jaw crushers and cone crushers, designed with a deep understanding of global crushing technology. Furthermore, we specialize in supplying a comprehensive range of premium OEM-compatible wear parts for major brands including ​Metso, ​Sandvik, and others, ensuring our clients achieve maximum productivity and cost-efficiency.