Lifting arm for crushing device

The lifting arm for the crushing device comprises a lifting arm body and a supporting assembly, the top of the lifting arm body can be connected with a corresponding crushing hopper, the supporting assembly comprises a first supporting rod and a first extending rod which are connected in a sliding mode, and the first supporting rod and the first extending rod are locked through a first locking piece. The bottom of the first supporting rod is hinged to the corresponding rack, and the top of the first extending rod is hinged to the lifting arm body. The first extension rod telescopically slides relative to the first support rod to push the lifting arm main body to rotate up and down, so that the crushing hopper can lift, the height position of the crushing hopper can be adjusted, the operation is convenient, the structure is more compact and stable, the occupied space is reduced, the safety, the stability and the reliability are high, and the practicability is high. And the application and development of the eq