Design And Development On The Cooling Type Roller Of The Mill

Milling roller is the components of grinding mill, which is used to squeeze, shear and peel scratch materials, so as to crush and grind materials. In the process of crushing and grinding, a lot of heat will be generated between the surface of material and roller because of extrusion and friction, the temperature of roller will increase gradually, the temperature of the roller surface could reach 60℃~ 80℃. If the roller can't be cooled in time in the process of work, the protein and heat-sensitive vitamins of materials will degenerate, which would greatly falling off the quality of the product. At the same time, it will cause the failure of grinding and reduce the life of the roller probably and increase power consumption because of the burning of materials and bonding paste on the roller. So the problem that the high temperature of the roller brings need urgently to be solved.In order to reduce the temperature of roller, domestic and foreign scholars have researched and designed the water-cooled roller, which is able to reduce it effectively, but brings about a series of problems. One of the biggest one is that it complexes water-cooled circulation devices, especially after doing the Assembly and Disassembly for many times, the encapsulation becomes the biggest problem, at the same time production cost is raised.In connection with above problems, in this paper, the design scheme of a heat pipe cooling type roller is put forward, through calculation and simulation design, the heat pipe cooling type roller core components -- rotating heat pipe is researched and the feasibility and reliability is proved through the test for this method of the cooling type roller. The cooling type roller for mill manufactured finally. The primary works of this paper are listed as follows:1. By calculating, the geometric size and function parameters of rotating heat pipe are designed, that is to determine the internal and external diameter size, length size, the work liquid material, the pipe shell material, the fluid-filled ratio, the fin height, thickness, chip numbers of the rotating heat pipe and so on. The rotating heat pipe meeting basic requirements has been produced.2. The test rig, on which the actual work status of the rotation heat pipe is simulated to test, is designed and improved to set up. By changing the heating temperature, speed and other test parameters, the transferring heat performance of the rotating heat pipe is analyzed. In addition, test results, theoretical analysis, and simulation results are compared to achieve some of the conclusions of the rotating heat pipe designed in this paper, such as the average transferred heat coefficient of the condensation paragraph of the rotating heat pipe increases with the speed; The deviation of the test value and the calculated value of the rotating heat pipe is within the scope of the deviation; Calculation and simulation results are basically right. The isotherm of the designed rotating heat pipe is good, and the research results lay the foundation for the further study.3. Having created the cooling type roller and passing the experimental verification of the cooling type roller's results, I find that the isothermal and start-up performance are good performances, and that the cooling type roller can well meet the requirements.4. Existing problems are put forward about cooling type roller, and some suggestions are made to research and design the heat pipe cooling type roller in the future.