Cantilever locking mechanism of medical tower crane

The invention provides a cantilever locking mechanism of a medical tower crane. The cantilever locking mechanism comprises a body, a cantilever, a first steel plate, a first friction plate, a second friction plate, a second steel plate, a gland, a bearing and a spline shaft, wherein the cantilever is sleeved on the body; the first steel plate, the first friction plate, the second friction plate and the second steel plate are successively sleeved on the body and are positioned on the inner side of the cantilever; the gland is sleeved on the body and tightly presses the first steel plate; the bearing is sleeved on the body, the spline shaft is arranged on the lower portion of the body; the periphery of the gland tightly presses the upper portion of the cantilever; and the bearing is positioned between the body and the cantilever. The cantilever locking mechanism has the advantages that the frictional force is increased by layered transmission of the steel plates and the friction plates, a rotary arm can be lock