Metal crusher is the use of high-speed rotating hammer installed in the chassis by the impact force to crush the material machinery. The rotor is the main working part of the hammer breaking machine. The main shaft is an important part for supporting the rotor. It is subject to large cyclic impact force, so the material of the main shaft is required to have higher strength and toughness. The main shaft can be selected to withstand the heavy impact load Bearing. Common single-rotor hammer broken machine equipped with high-speed conditions in normal operation, a small friction double row spherical roller bearings to the heart. Hammer broken rotor assembly after the balance (static balance and dynamic balance) higher requirements, because when the rotor has a small eccentric, then by its larger cyclical inertia force acting on the bearing, can cause the mechanical Strong vibration, make the bearing wear faster. In practice, the following experience is summarized by observing and analyzing the causes of early failure of bearings.
The original situation to use the factory made metal crusher, for example, the machine is 45 # steel quenched and tempered heat treatment, matching 3628 double row radial spherical roller bearings. After the installation of equipment in normal production, bearing temperature often appears suddenly (temperature over 80 degrees) is too high, accompanied by severe mechanical noise, affecting the normal production. Began to take down cooling, intermittent work, to maintain production more than a month after the equipment has been unable to normal operation, had to stop checking, found in the maintenance of the bearing inner ring and the spindle with the spindle at the occurrence of adhesion (adhesion) wear and tear, severe At the junction of the journal is torn peeling. Has put on the original assembly of two sets of rotor assembly supply, but the replacement of the new bearing, again at the same time appear similar to the above phenomenon.
The possibility of observation First suspicion of the above problems is due to rotor imbalance, resulting in inertia, but the rotor headwear smaller and uniform, static balance is better, there is no great vibration during work. Inspection found that the grease inside the bearing dry failure, may be due to excessive temperature caused by overheating grease failure and burn. Therefore, after the focus on strengthening the lubrication of the bearing management, fixed fat fixed quantitative fuel, the use of a slight improvement in the cycle but still not effectively prevent the occurrence of journal adhesion surface damage repeated occurrence. The final analysis may be due to improper assembly of the bearing.
