Rapid top pull operation for driving drum stern bearing change rapidly increase

Rapid top pull operation for driving drum tailstock rapidly increase 2019 - bearing replacement 04 - 19 YuLiPing 【 The status quo analysis 】 NingGang steel plant 4 #, 5 #, 11 #, 12 # line owners lifting rated lifting weight of 300 tons, the new 11 # crane rated lifting weight of 320 tons, are double drum. Drum diameter, 2 meters long, 3. 6 meters, 10 tons. Since put into production use, does not change the reel shaft bearing. In the first half of the tally found bearing a certain degree of wear and tear, unsafe, need gradually to the drum shaft bearing for replacement. Steel production is characterized by strong planning, can't stop driving for a long time for bearing replacement, and reel big volume, heavy weight, high in more than 30 meters, the replacement of bearing risk factors. If will roll down to the ground, replace the bearings after installation, volume, high risk and the construction time is long, will affect the steel production. Above replacement method is clearly not the reality. Sussing out steel maintenance projects department after receiving the construction task, in steel mills, under the guidance of relevant personnel on the scene view of driving for many times, and organize workshops to discuss the construction method, finally determine the 'making special plate, using hydraulic one thousand catties bumps pull' method replacing drum end bearing. 【 Scope of application technical characteristics 】 Steel main lifting rated lifting weight 300 tons and above driving drum end bearing replacement, can be applied to other tonnage of the driving drum bearing replacement. Need to design special dish, with 50 tons of hydraulic jack bearing. Pull the bearing and bearing a fixed set of whole, bearing and fixed heating installation as a whole. With the 16 tons of electric hoist hoisting drum rear bearing replacement, don't need to change drum crane to the ground, will not affect production. Operation key point of the top bearing, the bearing fixed, tail shaft through cover screw hole split install 4 root diameter 16 special double-headed screw, placed on the outside of the bearing is special plate, pull plate is placed between the shaft and 50 tons of hydraulic jack. Shaft through cover, screw, hydraulic jack, plate composed of a set of top bearing system is shown in figure 2. Figure 1 figure 2' Use effect 】 July with the same method to replace the 5 # driving south road south north of drum drum, 11 #, 12 # north of driving roller bearing and replaced the August 11 # 4 # the south side of driving drum, the new north road roller bearing and are planning to finish, have no effect on steel production, the effect is good. Change, will use the oil heating, strictly control the heating temperature, with copper bar into the bearing, good quality process control. Replacement process because there is no big fluctuation crane hoisting, construction safety and reliability.