Portable Copper Ore Crusher Machine

Abstract

Four methods to improve the early failure of rotor bearing in Portable Copper Ore Crusher Machine The Portable Copper Ore Crusher Machine uses the high-speed rotating hammer on the main body of the rotor to crush materials, and during the…

Four methods to improve the early failure of rotor bearing in Portable Copper Ore Crusher Machine

The Portable Copper Ore Crusher Machine uses the high-speed rotating hammer on the main body of the rotor to crush materials, and during the operation, the rotor bearing bears a large cyclic impact force. Due to the bad working conditions of the rotor bearing, coupled with the incorrect design, manufacture and use, the service life of the bearing is only a few months, which brings huge economic losses to the users. How to take effective measures to prevent premature failure of rotor bearing is a very concerned problem for many hammer manufacturers and users.

Choose a reasonable tolerance

At normal temperature, the rotor bearing is an interference fit, but when the working temperature of the bearing reaches 60 ° C or higher, it will be converted into a clearance fit, resulting in the relative movement between the journal and the inner ring. The friction heat caused by relative motion will worsen the bearing. On the other hand, if the temperature increases, the adhesive wear at the journal will lead to premature bearing damage.

In order to ensure that the bearing inner race and the journal basically maintain the interference fit without looseness under the condition of high temperature rise, the tolerance of the journal should be selected considering the thermal expansion of the inner race. For the outer ring, we hope to have a looser fit. On the one hand, when the bearing is overheated, the outer ring has enough expansion space, which can improve the stress of the outer ring and extend the service life of the outer ring.

Strengthen seal lubrication

Timely and correct lubrication can greatly reduce the friction resistance and inhibit the temperature rise of the bearing. In order to make the rotor bearing have the working characteristics of high speed and heavy load, molybdenum disulfide compound calcium base grease (zfg-3e) should be used to lubricate the bearing. In addition, add lubricating grease every 8 hours, change lubricating oil every 3 months, clean bearing, seal and cover with gasoline or kerosene, and replace labyrinth seal cover with large wear clearance in bearing seat.

Improve bearing stress

The impact load acting on the bearing depends on the impact amount acting on the rotor and the bearing flexibility of the bearing box, so as to increase the bearing flexibility of the bearing box and reduce the impact load acting on the bearing. Therefore, a rubber plate of appropriate thickness can be added between the bearing housing and the support frame to improve the bearing flexibility of the bearing. Due to the addition of rubber sheet, the flexibility is increased, thus part of vibration energy is absorbed, the bearing conditions are improved, and the service life is extended.

Balancing the rotor during assembly

The moving crusher rotor has high quality and high speed. When the rotor rotates, the casting deviation of the rotor body and the quality deviation caused by the installation of the hammer will cause the centrifugal force imbalance. This centrifugal force will cause forced vibration of the machine, which may damage the bearings and other parts. Therefore, the manufacturer must carry out balance test on the rotor to meet the standard requirements. When installing the hammer head, two hammers with equal mass shall be assembled in two mutually symmetrical positions, and the gravity of the hammer head shall be well matched to balance the gravity of the hammer head and the rotor of each row of gravity in the circumferential direction is equal. The axial gravity is evenly arranged to meet the balance requirements. Take extra care when replacing a new hammer.

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