In numerous industrial fields such as rubber and plastic, leather, textiles, dyeing and printing, chemical engineering, and new energy, thermal oil (heat transfer oil) is used as an efficient heat transfer medium and is widely applied to various rotating equipment that require heating, such as calendering machines, plastic mixers, drying drums, etc. And the thermal oil rotary joint is precisely the key "joint" that transfers these high-temperature heat transfer oils from static pipelines to rotating rollers.