Main-auxiliary sleeve type positioning device

The utility model discloses a main-auxiliary sleeve type positioning device belonging to the technical field of cranes. The main-auxiliary sleeve type positioning device comprises a main sleeve which is arranged on a trolley and an auxiliary sleeve which is arranged on a lifting tool. The main sleeve and the auxiliary sleeve are arranged vertically and oppositely. The auxiliary sleeve comprises a fixed link which is arranged on the lifting tool vertically. The main sleeve comprises a sleeve which is used for sheathing the fixed link and is fixedly arranged on the trolley. The precise position of a lifted heavy load is realized and no excessively large space is occupied. When the main-auxiliary sleeve type positioning device is in operation, the fixing position can be automatically adjusted. Meanwhile, because of the separate structure of the auxiliary sleeve and the main sleeve, the length of the sleeve is reduced and the borne inertia moment is reduced. Thus, the boundary dimension is small and the cost is l