The transmission ratio accuracy of belt drive is worse than that of gear meshing drive, but when it is overloaded, the belt slips and plays an overload protection role. The invention has the advantages of stable transmission, low noise, simple structure and convenient maintenance. Therefore, belt transmission mechanism is widely used in mechanical transmission. However, because the belt is easy to generate electrostatic discharge after rubbing, it cannot be used in places where combustion or explosion is easy to occur.

The dangerous part of the belt drive mechanism is where the belt joint and belt enter the pulley, so it should be protected.

The distance between the belt guard and the belt should not be less than 50mm, and the design should be reasonable so as not to affect the operation of the machine. Generally, the transmission mechanism is below 2m from the ground, and a protective cover should be set. But in the following three cases, even if it is more than 2m, it should be protected: the pulley spacing is more than 3 m; The width of the waistband is above 15cm; The rotating speed of the belt exceeds 9m/min. In this way, the broken belt will not fall and hurt people.

The joint of the belt must be firm and reliable. When installing the belt, it should be moderately elastic. The belt drive mechanism can be protected by covering all belts or using protective railings.

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