Main hoisting mechanism of material sucking and discharging crown block

The invention discloses a main hoisting mechanism of a material sucking and discharging crown block, the main hoisting mechanism of the material sucking and discharging crown block comprises a base, a first supporting plate is arranged on the upper surface of the base, a safety box is arranged on the upper surface of the first supporting plate, and a first through hole is formed in the safety box; and a sliding rod is slidably connected into the first through hole. According to the main hoisting mechanism of the material sucking and discharging crown block, through matched arrangement of a sliding rod, a limiting baffle, an electromagnetic iron ring, a first spring, a clamping block and a limiting block, when a winch braking system is powered off, the electromagnetic iron ring is powered off, then magnetism disappears, under the elastic force effect of the first spring, the limiting baffle is pushed to slide, the limiting block is extruded, and the limiting baffle is clamped by the limiting block; and meanwhi