Analyze The Temperature Field Of Roller Conveyor In The Heat Preservation Covers

Roller Conveyor is commonly used in steel production in the transmission equipment. Hot-rolled billet conveyor rollers in the middle of rough rolling mill group and between the finishing mills, bear the task of conveying the middle blank. In the production process, since the middle of billet conveyor rollers in a long running time, resulting in a large temperature difference between end to end, the edge of a serious temperature drop, leading to instability and the rolling edge cracking, reducing the quality and finished product rate. By the middle of billet conveyor rollers of additional insulation cover. Significantly improve the quality and finished product rate, works well. However, the temperature of roller conveyor also will rise, frequent roller bearings at both ends of deformation due to excessive heat generated stuck phenomenon has seriously affected the normal production.In this paper, the problem, using the finite element method on the conveyor roller temperature field numerical simulation of the transport system in the hot roll temperature field in the process of change; according to the normal bearing operating temperature, calculated heat flux journal office combined with water-cooled heat exchanger, determined the roller bearings at both ends of the cooling system water spray. The main contents include:(1) This paper analyzes the roller conveyor system in the transmission process in the temperature change, because Roller Conveyor system during operation by alternating the role of load, if the establishment of the whole model into a three-dimensional load terms, the boundary too complex loading conditions and load calculation is very difficult. Therefore, in order to be able not only to the reality of the model seems reasonable, but also can reduce the computation and reduce the calculation is difficult, we simplify the model. Three-dimensional simulation will be reduced to two-dimensional two-step treatment: roller body radial cross section calculation of transient temperature field and temperature field axial roller system of calculation. In this way, reasonable responses to the actual transportation roller during operation of the temperature field changes within the system, but also simplify the calculation.(2), body roll in the radial cross section of temperature field calculation, the roller simplified calculation of transient temperature field for the plane, it can be a true reflection of conveying rollers are in the slab when the slab by heat conduction and radiation, temperature changes. This step can get roller temperature distribution profiles and the roll body temperature and time of data transmission for the further roll model calculation basis.(3) Department of axial roll temperature field calculation, due to the contact roller body and part of the length of the slab is much larger than the size of roller body section diameter, and the delivery roller part of the roller contacts with the slab body structure, thermal environment, materials, uniform, continuous are identical. Therefore, we can actually reduce the problem in three-dimensional space to a two-dimensional problem to do similar processing. The radial cross section on the roll stability of the temperature and time data as boundary conditions, cross-section model is loaded into the roller shaft body, to steady-state analysis to obtain the entire transportation system operation during roll temperature distribution. This decomposition not only reduces the computational difficulty, while real conditions will reasonably decomposed to accurately reflect the operation of the conveyor roller process.(4) The bearing of the normal operating temperature, calculated heat flux journal office, combined with water-cooled heat exchanger, determined the roller bearings at both ends of the cooling system, water spray.In this paper, the finite element method conveyor rollers during operation of the temperature field to determine the transport roller water spray cooling system for the development of transportation programs and the cooling roller conveyor rollers to ensure an increased heat shield can be long after time of normal operation, providing a theoretical basis.