Summary: High speed rotating rotor with blow bar is the main working part of impact crusher. In order to meet the requirements to crush large sized ore, the rotor should have sufficient weight and run stably....

High speed rotating rotor with blow bar is the main working part of impact crusher. In order to meet the requirements to crush large sized ore, the rotor should have sufficient weight and run stably.

After replacing new blow bar and assembling and repairing old blow bar, maintainers should pay attention to the balance of rotor. Here are the consequences, causes, solutions to rotor imbalance, as well as rotor maintenance measures.

Consequences Of The Unbalance Of Rotor

1) Unbalance of rotor will produce a large inertia force and inertia moment, which will cause the unstable operation of impact crusher;

2) The unbalance of the rotor will cause greater vibration of the components, generate additional dynamic loads, destroy the normal operating conditions of the impact crusher, make the bearing temperature rise too high, shorten the service life, and even cause cracks and damage to some parts.

Reasons About The Unbalance Of Rotor

1) The quality of rotor is not up to standard. The manufacturer does not strictly follow the manufacturing requirements, and the rotor is not qualified;

2) The end face of the rotor body is severely and unevenly worn, causing the center of mass to deviate from the rotor center. As a result, the static and dynamic balance of the rotor cannot be guaranteed.

3) The uneven feeding of impact crusher causes uneven force on the rotor and disrupts the balance of rotor.

Solutions About The Unbalance Of Rotor

1) Carry out a balance test on the rotor before putting the impact crusher into production;

2) Raw materials should be fed into the impact crusher evenly and continuously to avoid uneven force on the rotor;

3) When replacing the blow bar, it is best to replace it symmetrically or change the whole set, and install it correctly.

Tips For Maintenance Of The Rotor

The working conditions of impact crusher are severe, which will aggravate the wear of rotor bearing. Once the rotor fails, the cost of repair and replacement is very high, and replacement is very difficult. So, it is very important to take effective measures to increase the service life of rotor bearings in impact crusher.

Here are some tips for the maintenance of the rotor:

1. choose the model of rotor bearing correctly

Double-row radial spherical roller bearings have strong load-bearing capacity and good self-aligning performance, so this type of bearing is often used as a rotor bearing in impact crushers.

2. Improve the force condition of impact crusher bearing

The impact load acting on the bearing depends on the impulse acting on the rotor and the support flexibility of the bearing seats. Increasing the support flexibility of the bearing seats will reduce the impact load on the bearing.

In this case, we can put a rubber plate with proper thickness between the bearing seats and the support frame to improve the support flexibility of the bearing seats.The rubber plates absorbs part of the vibration energy, improves the bearing force condition, and prolongs the service life of the rotor.

3. improve the balance accuracy of rotor

The rotor of impact crusher has a large mass and a high speed. The casting deviation of the rotor and the mass deviation caused by the installation of blow bar will make the rotor produce unbalanced centrifugal force while rotating. The centrifugal force will make the impact crusher generate forced vibrations, causing damage to bearings and other parts. Therefore, the rotor of the impact crusher needs a balance test before production.

The rotor is a very important part of the impact crusher. Correct use and reasonable maintenance can effectively avoid rotor unbalance faults and avoid unnecessary shutdowns of the impact crusher.