In explosive environments, in addition to the use of electrical equipment, a large number of non electrical devices are also used, such as conveyors, air compressors, mixers, exoskeleton equipment, etc. Among these devices, reducers, gearboxes, pulleys, brakes, and other devices are used. Although these devices do not use electricity and have no power, they have high-speed moving parts during operation. During use, sparks may be generated due to collisions, and high temperatures may be generated due to friction, compression, and other factors. For explosive hazardous areas, these are dangerous ignition sources and pose a risk of igniting explosive substances in the environment.

Although these hazards have been considered in the design process of these devices and some measures have been taken to reduce their occurrence, such as using oil cooled and sealed structures for reducers, and protecting moving parts with protective covers, these local measures cannot fundamentally solve the danger of sparks and high temperatures generated by non electrical equipment when used in explosive environments, especially since these devices are often complex products, and multiple structures on one device may pose an explosion hazard.

Therefore, such non electrical equipment needs to consider taking explosion-proof protection measures to achieve explosion-proof performance.