Rotary kiln roller bearing shell temperature causes and treatment methods

Rotary kiln roller bearing shell temperature 2020 - cause and the treatment method 04 - 08 sea ChanDan Qian Fang ( Shenyang cement machinery co. , LTD. ) Rotary kiln cement enterprises is the key equipment in the process of production of a cement plant 'heart' roller as rotary kiln, under thermal load, the material load and kiln three weight load. The stable operation of the rotary kiln is the guarantee of safe operation, also directly affect the production of cement plant and the operation rate. But the roller bearing with fever can affect the operation efficiency of rotary kiln. In this paper, the heat causes and treatment measures of the roller bearing shell are discussed. A fever cases, common roller bearings and handling measures ( 1) Roller bearing caused by oil heating roller bearing lubricating oil reach standard without an oil change, oil change caused by lubricant oil emulsification viscosity reduction, or, or oil contains impurities such as dust, can cause bearing heating. Measures: lubricating oil should have abrasion resistance, anti-oxidation, emulsification, corrosion resistance, high temperature resistant performance, such as viscosity coefficient index, and has a high when he worked in roller bearing can form a certain thickness of oil film protection shaft and bushing, so should choose special lubricants and replaced periodically. （ 2) Roller oil and lubrication device loss caused by bearing fever for shaft seal is not good, serious, reduce oil level, or spoon, lubricating oil lubrication and cause temperature rise of bearing bush. Measures: replace the sealing ring roller seal, tighten lubrication spoon. （ 3) Hydraulic gear wheel bearing fever caused by uneven speed when the hydraulic catch wheel upstream speed slow and uneven, and the downward speed is too fast, formed the axial thrust downward, the thrust can also be produced between the axle and the tile relatively sharp move and friction. When a roller thrust plate and the end contact bearing clearance hours, will appear bearing fever phenomenon. Measures: check hydraulic wheel speed regulating valve, throttle valve opening and oil cylinder seals. （ 4) Because of circulating water not free, less or inner loop pipe water seepage caused by fever when the roller bearing inner loop pipe ageing have leakage, lubricating oil emulsification, worsen oily, bearing heating. Treatment: according to the in and out of the water meter of the shuikou provide enough cooling water, water temperature table. The periodic check meter, prevent excessive cooling water impurities. （ 5) Bearing temperature rise caused by small tile edging clearance roller bearing used for a long time, and shaft contact Angle is bigger and bigger, and tile edging contact with axial clearance is becoming more and more small, small to a certain degree, the lubricating oil can't go into the bottom of the bearing lubrication, bearing caused by fever. Measures: to open tile edging, tile edging clearance to 0. 003 d ( mm） （ D for shaft diameter) 。 ( 6) Belting leather and roller surface stress concentration caused by roller bearing temperature rise and belting leather under the condition of the normal force, the contact surface light, colour and lustre degree should be consistent, there is no obvious vertical stripes of light and shade of belting leather. If appear light and dark stripes, light on one side of the show and the bearing force of the bearing is larger, whereas the other side is small. If the belting leather dark stripes in contact with the roller from gap, its dark stripe area is larger, the roller bearing shell will appear fever phenomenon. Measures: to rotary kiln roller rotate slowly, make belting leather and roller surface to achieve specified requirements, generally more than 60%. ( 7) Base and roller bearing group bearing caused by fever caused by installation base and roller bearing group bearing caused by fever. Measures: NSP kiln adopts hydraulic gear wheel, roller and longitudinal center line parallel to the longitudinal center line of rotary kiln, within the perpendicular to the vertical plane of the longitudinal center line of rotary kiln, each file within the two roller center and the center of belting leather should make regular triangle, each Angle of 60 & deg; , as shown in figure 1. Only under the conditions to ensure that each tile force equilibrium, thus avoiding roller by the longitudinal force and make the supporting shaft end thrust out unreasonable friction between the ring and the surface of the bushing, results in the decrease of bushing temperature, rigidity, strain, deformation and failure of the serious consequences. As shown in figure 2. ( 8) Roller bearing caused by scraping the inquiry bearing shell heat treatment: spherical tile spherical should cooperate with bearing base in research, each of the 25 mm & times; 25 mm area of not less than 1 ~ 2 PM, contact point between the contact surface evenly daub grease when installation, requirements of spherical tile can move, without resistance, so the wheel on both sides of the bearing during operation can achieve self adjustment, to ensure that the supporting force equilibrium. Bushing and axle shaft neck should be exposed, A narrow strip, asked the contact zone along the full length of continuous width, namely the bushing work surfaces in contact with the supporting shaft area into A uniform continuous strip with up and down the bus, the actual contact with A 30 mm ( See figure 3) 。 The bushing material variety, in practice, should consider the various characteristics of the bushing material itself, the specific value of contact zone to make correction. Bushing on both ends of the tile edging slightly greater than zero clearance requirements on each side. d ~ 0 1%。 d (15% D) in the name of the journal diameter , as shown in figure 4. To ensure lubrication, it is suggested that amplify appropriate tile edging clearance, take 1. 2 - 1. 5mm。 Second, the epilogue bearing fever are common problems in the operation of rotary kiln, a variety of reasons, so to solve the hot roller bearing is a comprehensive management process, need to constantly sum up experience, optimization of process operation, carefully for routine maintenance, to ensure the stable operation of rotary kiln.