Dust explosion-proof FPI-12-30 two-stage deviation switch is a product in conveyor belt automation. Can be used for underground and cableway support belt conveyors; Ship loading and unloading system; Stacking/reclaiming conveyor; Tilt and shuttle conveyors; Cranes, excavators, boom limits; Skirt feeder/conveyor; The heavy-duty limit switch detects the deviation of the adhesive tape, which is a protective device for automatic alarm and shutdown of the adhesive tape machine control. The FPI-20-35 deviation switch is a protective device used to detect the deviation and twisting degree of the conveyor belt, which can prevent edge damage and material scattering caused by belt deviation, and achieve automatic alarm and shutdown. When the tape in motion deviates, the edge of the tape drives vertical rotation and compresses to tilt the material. If the tilt of the vertical roller is greater than the action angle, immediately send out a set of switch signals; If the vertical roller continues to tilt more than the second level action angle, another set of switch signals will be output, and the two sets of switch signals can be used for alarm or shutdown respectively. The switch is installed on both sides of the belt conveyor in the chemical plant as a deviation accident detection device. Level 1 signal is used for light deviation warning. Connecting this signal to automatic adjustment of deviation can achieve automatic correction function without stopping the machine. Level 2 action outputs an automatic stop signal for heavy deviation. Working principle: When the tape in motion deviates, the edge of the tape drives vertical rotation and compresses to tilt the material. If the tilt of the vertical roller is greater than the action angle, immediately send out a set of switch signals; If the vertical roller continues to tilt more than the second level action angle, another set of switch signals will be output, and the two sets of switch signals can be used for alarm or shutdown respectively< br/>