Balance weight mechanism capable of automatically disassembling and assembling axle housing

The utility model provides an automatic dismounting axle housing counter weight mechanism which comprises an axle housing counter weight plate and a connecting rod pressing mechanism arranged on the axle housing counter weight plate, axle housing counter weight adopts a counter weight plate form, and the connecting rod pressing mechanism pushes an inclined block and an axle housing to be locked or loosened under the action of external force provided by a push-pull structure. A single tooth pin structure enables the axle housing balance weight plate not to loosen in the rotating machining process, a disc spring is additionally arranged in a connecting rod pressing mechanism so that a locking shaft can store elastic force to eliminate a gap between two teeth of a locking tooth pin, and the axle housing balance weight plate can be tightly matched with an axle opening. In order to adapt to bridge openings of different workpieces, the balance weight plate library is designed, when production changing is needed, th