Crusher and movable cone nut protective sleeve thereof

The utility model discloses a crusher and a movable cone nut protective sleeve thereof, and the movable cone nut protective sleeve comprises a protective sleeve main body sleeved at the periphery of a movable cone nut, the protective sleeve body is provided with a lining hole used for being matched with a main shaft lining, a movable cone nut hole used for being matched with a movable cone nut and a boss hole used for being matched with a boss of the movable cone nut. The lining hole and the movable cone nut hole are coaxially communicated. The boss hole is connected to the outer edge of the movable cone nut hole, and the depth of the boss hole is larger than or equal to the distance between the boss and the lower end face of the cutting ring. Therefore, the outer wall surface of the protective sleeve main body effectively reduces the contact abrasion of the cutting ring, the boss and the ore, prolongs the service life of the cutting ring and the boss, prevents the cutting ring and the boss from being damaged