The heating system of the conveyor belt vulcanizing machine is analyzed as follows:
Composition of the heating system
The heating system of the conveyor belt vulcanizing machine is mainly composed of heating plates and heat insulation plates. The heating plate is the heating component of the vulcanizing machine. It is equipped with electric heating elements inside to ensure the heating temperature required for the vulcanization of the conveyor belt joint. The heat insulation plate is set between the electric heating plate and the frame to reduce the heat loss of the electric heating plate and improve the thermal efficiency.
Heating method
Steam heating: Initially, most vulcanizing machines used steam as the heat source to control the temperature. Steam heating medium is relatively inexpensive, the pipeline control is simple, and the cost is low. However, there is a temperature lag during the heating process, and the controllability of the process is poor. In the steam heating structure, there are equal-spaced channels inside the heating plate and perpendicular channels on the other side. A serpentine structure is formed by using conical nuts, plugs and plug supports. When steam enters the serpentine structure, it flows along the pre-planned route and exchanges heat with the surface of the heating plate’s channels, thereby raising the temperature of the heating plate.
Heat transfer oil heating: Compared with steam heating, heat transfer oil heating has the advantages of small temperature fluctuation, easy realization of automatic control, and good product quality. The heat transfer oil heating system can output high-temperature hot oil to heat users under normal pressure liquid phase, and adopts intelligent temperature control technology with high control accuracy. In addition, the heat transfer oil heating system adopts a liquid-phase closed-loop circulation, featuring a high heat utilization rate and significant energy savings compared with steam boilers.
Electric heating tube heating: In the electric heating tube heating plate, holes are drilled according to the equal or unequal spacing arrangement of the heating tubes. After being powered on, the heating tubes heat up, and the heating plate is heated through heat transfer.
Electromagnetic induction heating: Induction heating mainly relies on induced current to form Joule heat on a magnetic object, generating a heat source to raise the temperature of the object. When high-frequency alternating current is passed through a coil, an alternating magnetic field is generated around it. The magnetic flux passes through the heating plate, and an induced electromotive force that hinders the change of the magnetic flux is produced at the center of the heating plate. This creates a closed loop and forms vortex-like current lines, which are called eddy currents. Eddy currents can generate huge amounts of heat, thereby raising the temperature of the heating plate.
Characteristics and advantages of the heating system
Fast heating: The efficient heating system can raise the heating plate to the set temperature in a relatively short time, reducing the vulcanization preparation time.
Uniform temperature: By optimizing the layout of heating elements and insulation design, the heating system can achieve uniform surface temperature of the heating plate, reducing the impact of temperature gradients on the quality of vulcanization.
High thermal efficiency: By optimizing the layout of heating elements and insulation design, the heating system can efficiently convert electrical energy or other thermal energy into the heat required for rubber vulcanization, reducing energy loss.
Heating system control
The control of the heating system is usually accomplished by an electrical control box. The electric control box can automatically control the heating temperature, constant temperature maintenance and power-off control of the vulcanization operation. Through precise temperature control, it can be ensured that the conveyor belt joints achieve uniform and stable heating effects during the vulcanization process.