Chain crusher capable of efficiently crushing sludge

A crushing bin is installed on one side of the top end of a rack in an embedded mode, a PVC lining plate is installed on the inner wall of the crushing bin through screws, a feeding box is installed at the position, corresponding to an inlet, of the top end of the crushing bin, a main shaft is rotatably installed between two feeding ports in an embedded mode, and a fixing block is installed on one side of the top end of the rack; connecting columns are uniformly embedded into the top end of the mounting sleeve, a thick chain is connected to the top of the outer side of the mounting sleeve through the connecting columns, a thin chain is connected to the bottom of the outer side of the mounting sleeve through the connecting columns, and the crushing chain is of a structure with the thick upper portion and the thin lower portion; sludge blocks are crushed to be finer through the thin chains, the service life of the chains can be prolonged through the thick chains, the contact face of the thin chains is smaller,