Bakelite bearings and universal application to take over at the beginning of the mill rollers

I. Introduction
        Roller is rolling workshop indispensable transport equipment. Because domestic blooming mill roller failure affecting production accounts for about 30 to 50 %. Most of the work is caused by the roller punch . Rod damage caused. Roller usually have to withstand high loads , particularly the heavy roller is rolling back and forth to work , their working environment more hostile , reversing frequent starting and braking , but also to withstand the impact of falling or rolling loads generated when tipping . It is the work in which the ambient temperature is high, the long-term withstand baking red steel and iron oxide and water intrusion insiders also continue to drive mechanism . In addition to working roller spare parts consumed in large quantities , the maintenance workload is particularly heavy. This issue has long become a blooming plant equipment problems.
        Second, after the beginning of the roller mill Problems
        I plant before and after the beginning of the roller mill adopts bevel gear former collective transmission, 10 rolls form a group consisting of a combined motor.
        Roller support bearings at both ends , originally using rolling bearings , due to withstand shock loads when turning steel , and then switch to copper tile . In the case of constant rotation of the roller , because the copper tile and red steel baking severely affected , along with the structure itself is not easy lubrication , so its badly worn , consume large. But also often caused by replacing the copper tile production. In addition , due to the different degrees of copper tile wear 10 , so 10 is not the same level of the rollers , and therefore can not guarantee that all of the bevel gear meshing correctly. At one end of the roller is equipped with bevel gear , bevel gear box by a long drive shaft to drive the rotation. Long shaft bevel gear rely on hook key to wedge tight .
        Due to frequent reversing roller mill around , by the impact of severe , long shaft bevel gear often appear on the loose . The fixed bearing is also very easy to loose screw and elongated even pull off ( consistent bolt force and shock loading direction ) . Thus , due to the fixed bearing live rollers in case of a shock on the beat is easy , does not always result in the bevel gear or gear wear caused by uneven engagement serious. Since the front and rear roller mill high surface temperature , reversing frequently, and also withstand shock loads when turning steel rollers in the case by the impact , directly collided with copper tile , it rolls off phenomenon often occurs .
        Actual production shows that focus driven roller exist many problems , spare parts consumption , long service time , shorter service life of each part , the impact of improved mill operating rates . According to statistics, the amount of maintenance before and after the two roller mills accounted for about 35 percent of our plant equipment maintenance amount rolling line , basically every shift and weekly maintenance inspection, have their maintenance projects .
        Third, bakelite bearings and universal choice to take over
        In response to these problems, we combine plant equipment repair, for the front and rear roller mill has been transformed mainly into the copper tile bakelite bearings, water lubricated. In order to reduce the impact load, bearing the following set of disc springs . In order to transfer less shock and vibration reducer box , roller and reducer in connection adds a slide -type universal over.
        Tend to work early today before the roller mill development at home and abroad in the form of a separate drive . Our factory due to restrictions on the location of the ground , while the use of 10 rolls divided into four groups driven.
        By comparison, the improved structure has the following advantages:
        1 due to de- tooth gear to fight tooth and because of the uneven gear wear caused serious basically eliminated. Reduce the number of off roller. The reason is that bakelite bearings with a larger seismic, impact resistance , disc springs can Chuan, reduces vibrations strike , took a rather universal and can change with the angle of the roller beating , so that the impact shock generated when turning steel transmission less than deceleration box . In the three and a half of production, reduction gear box has been normal , not out of trouble too .
        2 , low coefficient of friction bearing bakelite , according to the projection data , the energy consumption of the bearing bakelite lower than the non-ferrous metal bearings 15 to 50% . Bakelite polished bearing journals can improve the working conditions.
        3 spare longevity and reduce costs. Under but in 1984 after roller mill renovation, major spare parts consumption comparison table . . Seen from the table, the new roller not only reduces the spare parts consumption , but also save the country a lot of non-ferrous metals . Bearing the cost of bakelite and only about a quarter of copper tile , so the cost is cheap, easy to produce .
        Since bakelite bearing wear metal bearing 10 to 40 times longer life than metal bearings , thus saving the consumption of spare parts , reduce their maintenance time and improve the operating rate of the device.
        4 significant economic benefits. In the transformation before consuming work at the beginning of the mill rollers around the human, financial and material resources is quite large , about 42 hours a month left before the time of the accident and repair time, and after the transformation is reduced to about 27 hours per month so, improve the efficiency of the mill , the rolling mill is increased.
        October rolling ingot capacity 128,000 tons , about the transformation of the former is higher than the highest yield of the month 9.5 tons. Profit for the country 35 million yuan. Due to significantly lower consumption of spare parts , about a month less than the transformation of the former consumption costs seven thousand dollars , and spare parts costs reduced by about 80%.