Design and Temperature Uniformity Optimization of Electromagnetic Heating Hot Plate for Tire Vulcanizing Machine

To address the issue of temperature uniformity during the tire vulcanization process baesd on electromagnetic heating, this study focuses on the hot plate of a tire vulcanizing machine and optimizes the electromagnetic heating temperature uniformity design. An octagonal hot plate with dimensions of 1380×1380×60mm was adopted and temperature sensors were installed to monitor temperature changes in real-time. Through electromagnetic simulation, the effects of current intensity, current frequency, and coil to hot plate distance on temperature uniformity were studied, and various coil structures were designed and compared. The experimental results show that the temperature difference of the hot plate is controlled within ±2 ℃, which meets the requirements of the vulcanization process. Simulation results show that the temperature difference increases with current intensity and current frequency, while the temperature difference decreases with the increase of coil to hot plate distance. It shows that the multi-ring circular coil has the best uniformity when heating a circular hot plate, and the flower shaped coil has best temperature uniformity when heating an octagonal hot plate. This design scheme improves temperature uniformity effectively, and provides theoretical and practical basis for the application of electromagnetic heating technology using in tire vulcanizing.