Attention! Iron Jamming Causes Continuous Damage to Impact Crusher Rotor Body

In mining crushing and construction solid waste treatment sites, iron pieces mixed into materials act as hidden risks to the rotor of impact crushers. Many operators only check whether the blow bars are damaged, ignoring the continuous damage to the rotor body caused by iron jamming. Such damage accumulates during continuous production and gradually affects the stable operation of the whole crushing equipment.

When iron pieces such as bucket teeth, drill bits and steel plates enter the crushing chamber with materials and get stuck, the huge impact load generated at the moment the high-speed rotating blow bars strike the iron pieces is directly transmitted to the rotor base. A single impact leaves indentations on the rotor surface and produces invisible microcracks. During continuous production of the production line, alternating stress acts repeatedly, making the microcracks extend slowly. With the increase of impact times, the cracks deepen and may cause local cracking of the rotor in severe cases.

When iron pieces are stuck between blow bars and impact liners, the rotor load rises sharply in a short time, resulting in obvious torque fluctuation. The fluctuating load continuously acts on the blow bar mounting grooves of the rotor and causes extrusion deformation of the grooves. After the deformation of mounting grooves, the fitting precision between blow bars and the rotor decreases. The force distribution becomes uneven during equipment operation, which further amplifies vibration and forms a vicious cycle. The continuous transmission of vibration also acts on the rotor main shaft and bearing housing, accelerating bearing wear and increasing the frequency of equipment shutdown for maintenance.

Under some working conditions, if iron pieces remain stuck in the crushing chamber and cannot be discharged, the rotor may be locked temporarily. The motor continuously outputs torque, bringing torsional stress to the rotor and changing its original dynamic balance state. Once the dynamic balance of the rotor is disrupted, the equipment runs with high vibration for a long time, which continuously wears the rotor structure and loosens the frame and anchor bolts, bringing potential safety hazards to the site. The repair of the rotor body is much more difficult than blow bar replacement. Rotor calibration and welding repair require complete equipment disassembly, which takes plenty of production time and leads to capacity loss.

In daily production, iron removal devices can be installed on the feeding belt. Regular inspection of the iron removal equipment helps reduce the possibility of iron entering the crushing chamber. During each shutdown maintenance, in addition to inspecting blow bar wear, operators should check for indentations and tiny cracks on the rotor mounting grooves and rotor base surface to detect hidden risks in advance. Hunan Xiangjian Machinery Technology Co., Ltd. focuses on mining wear-resistant parts. Its core products include cone concave, mantle, jaw plate, toggle plate, guard plate, impact crusher blow bar, ball mill liner, hammer head and gyratory crusher liner. The company serves mines and sand plants for ore crushing applications and can provide supporting reference solutions for different working conditions. If metal foreign matters often enter the feeding material at your crushing site and you want to learn about protection solutions for rotors and wear-resistant parts, feel free to contact us. We can offer corresponding suggestions combined with your on-site materials and equipment models.