The analysis of conclusions As the crusher rotor bear a heavier impact load, friction and heat when the bearing operation, the bearing inner ring temperature is higher than its associated journal temperature, so that due to thermal expansion of the bearing inner ring with the journal with loose. In actual work, due to the different changes of the temperature rise of the bearing inner ring and the journal, their cooperation properties are constantly changing in each period. The bearing inner ring and journal fit in the initial state (within about 1 hour) for the interference fit, early work (about 2 hours) for the gap with the work late (about 2 hours later) for the transition fit. Therefore, the original design of the choice of tolerance easy to make the bearing due to friction and heat expansion, in the early work about 1 to 2 hours relative slip occurs within the inner ring and the journal, the inner ring in the neck with the oil surface "crawling" phenomenon, with Journal due to the role of high-stress load stress, the metal surface due to fatigue peeling phenomenon, and ultimately lead to early bearing failure and journal adhesive wear.
Improvement measures to change the tightness of the bearing inner ring and journal coordination Considering the characteristics of the hammer breaking machine under heavy cyclic impact load and the influence of working temperature rise, the tolerance of bearing inner race and journal should be selected. Ensure that the bearing inner ring and the journal maintain the interference or transition fit without loosening under the condition of higher temperature rise. In addition, the axial elongation of the spindle after heating generated axial displacement of the bearing with the outer ring along with the relative displacement of the bearing radial clearance decreases, and even the occurrence of bearing stuck phenomenon, the bearing outer ring should be selected and bearing housing tolerance With, and one of the bearing and the outer end of the bearing gland left gap. Rotor balance due to the rotor mass, high speed, a small amount of unbalance, it will have a lot of vibration, and to increase power, causing serious damage to the bearings, therefore, the rotor must be balanced before use. An important factor that affects the balance of the rotor is the hammerhead. By changing the hammerheads, the two hammerheads of equal mass are assembled in two mutually symmetrical positions, and the gravity of the hammerheads needs to be matched so that the gravity of the hammerheads is aligned Balance, the circumferential direction of the rotor equal to each row of gravity, axial gravity uniform arrangement, so hammer broken machine to run up the rotor to achieve balance requirements, to avoid vibration. Special attention should be paid when replacing a new hammerhead. Strengthen the sealed lubrication timely and correct lubrication can reduce the frictional resistance, cooling can remove the frictional heat and suppress the bearing temperature. Hammer breaking machine for high-speed, heavy-duty, large bearing temperature characteristics should be used calcium aluminum sulfide composite calcium-based grease lubrication of bearings. The grease for less than 140 degrees, high temperature, high speed, heavy duty applications, its performance is better than the general composite calcium grease, its high temperature resistance, abrasion resistance and extreme pressure resistance, the service life is also far superior to ordinary calcium Grease. As Hammer broken machine work in harsh environmental conditions, larger grease friction loss should be filled with grease once every 8 hours of work, every three months to change the oil once, and with gasoline or kerosene cleaning bearings and glands and Cover, replace the labyrinth seal cover and cover with excessive wear clearance on the bearing seat in time.
