Internal fires, also known as spontaneous combustion fires, are caused by the physical and chemical reaction heat of the rock itself. The formation of such a fire, in addition to the characteristics of oxidative self-heating of the ore itself, must also have a heat collecting condition. When the heat is accumulated, the temperature rise phenomenon must occur. The temperature rise causes the accelerated oxidation of the rock and the vicious cycle. When the temperature reaches the ignition point of the substance, a natural fire occurs. External fires, also known as external fires, are fires caused by various external causes. For example: 1. Fires ignited by open flames; 2. Fires caused by oil during transportation, storage and use; 3. Fires caused by explosives during transportation, processing and use; 4. Mechanical effects Fire; 5. Fire caused by insulation damage and poor performance of electrical equipment. Yarn Assembly Winding Machine,Assembly Winding Machine,Cheese Yarn Winding Machine,Yarn Package Winding Machine JIEPAI MACHINERY , https://www.jyjiepai.com