Research And Design Of Oven In Highway Engineering

The oven is a commonly used heating device in the road indoor test.It is mainly used to heat or insulate asphalt,aggregates,and mixtures.As these substances have strict requirements on the temperature state during the indoor test,the temperature of the oven is controlled.Accuracy and insulation capabilities are extremely important.However,most of the ovens used in the laboratories in the current price range are general-purpose ovens,which have low temperature control accuracy and poor temperature uniformity in the inner cavity.This can easily lead to the heating or heat preservation materials failing to reach the standard temperature of the test,which eventually leads to The result of the test is distorted.Therefore,this article made a high-precision oven suitable for the road industry,so that when the test is carried out,the test result is more reliable,and the indoor test has more practical engineering significance.In order to make a road-specific oven,this article first made a detailed investigation and analysis of all aspects of the general-purpose oven,including the design shortcomings of the general-purpose oven,internal cavity temperature distribution,uniformity,temperature control accuracy,fluctuation,etc.,and then passed the specific The test proves that the universal oven has a great influence on the test results.Secondly,this paper analyzes the heat transfer mode and heat transfer mechanism of the oven,calculates the heat transfer of the oven in different modes,and obtains the main heat transfer mode of the oven,and proposes improvements and optimization suggestions for the main heat transfer mode.When improving and optimizing the oven,this article adopts the method of simulating first and then making samples.In order to make the results of the simulation have practical significance,this article firstly modeled the general oven,and verified the reliability of the model by comparing the results of the simulation and the actual measurement.Then,the test plan was designed,and the temperature field of the hot fan at different positions and the oven at different wind speeds was simulated by the model,and the best hot fan position and the best wind speed of the oven were obtained by using the temperature uniformity of the oven as a measurement index.Secondly,the temperature field distribution formed by the heat source was studied by simulation.According to the simulation result of a single heat source,the relationship between the temperature and the distance of the heat source was obtained;the uniformity of the temperature field at different distances from the two-sided heat source was obtained.The optimal design width of the oven;based on the optimal distance of the heat source on both sides,the relationship between the uniformity of the temperature field and the distance of the third heat source is studied,and the optimal design height of the oven is obtained;the optimal size of the heat source on the three sides is maintained Based on the study of the distance relationship between the temperature uniformity and the fourth heat source,the optimal design depth of the oven was obtained.Then using the model under the optimal wind speed,by changing the power of the heat source,the relationship between the power and the average temperature of the oven was studied.Finally,using the conclusions of the simulation,a model of the road-specific oven was made.The simulation results of the road-specific oven showed that the structural size and boundary conditions of the model were reasonable.Under the condition that the simulation results of the road-specific oven model are relatively good,this paper carries out the actual restoration according to the simulated model.First,the parts and materials of the road-specific oven are selected,and then the drawings are designed for the structure of each part of the oven and follow The structure of the drawings was restored,and a sample of a road-specific oven was obtained through assembly with parts.After the sample oven was successfully made,a new temperature control system was provided to the sample oven through hardware selection and software design.The correctness of the simulation was verified through actual tests.At the same time,the control system was debugged and analyzed.Finally,The solutions to improve the control accuracy of the sample oven are given.