Reasons for Abrasion of Impact Crusher’s Rotor and Flat Hammer

Impact crusher is a type of new high efficiency crushing equipment. It has the advantages of small in size, simple structure, high crushing ratio, low energy consumption, big output capacity, even final product size.

However, the impact crusher also has a weakness: the flat hammer and impact plate of impact crusher are easy to be abraded, especially in the process of crushing hard ore, so they shall be changed frequently. 

1.    Reasons for the abrasion
During the crushing process, rotor and flat hammer of impact crusher will be abraded and impacted unevenly by the raw crushing material, and then the clearance will appear between the surface of the flat hammer and rotor. When the impact crusher is running, the rotor will vibrate because after being abraded, the gravity center of rotor and its rotation center will be far from each other which will produce additional centrifugal force. In this way, the bearing will be abraded prematurely and bend. That will influence the installation of flat hammer which has to suspend and bear bending shear force. Hence, the service life of flat hammer will be shortened. The screw of flat hammer will often break off or bend, which will affect the regular work of impact crusher.

2.    Solutions for the abrasion
(1)    Ensure the balance of rotor parts when repair the rotor and change the flat hammer.
①    Sling up the upper cover of the impact crusher, dismount the v-belt and clean the bearing pedestal and bearing at the two sides.
②    After the clearing, inject the machine oil and rotate the rotor by hand till it can rotate flexibly and conveniently.
③    Observe the balance situation of the rotor when rotate it.
④    Confirm the weld position and mark it based on the unbalance situation when the rotor is rotating.
⑤    Divide the rotor length into several sections with each section of about 20mm and mark them.
⑥    Dismount the old flat hammer, and weigh the new flat hammer one by one, and marked their weight on the flat hammer by chalk.
⑦    Prepare the hand grinder and arc welding device.


In the follow article, we will give more suggestions about the maintenance of rotor and flat hammer of impact crusher.

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