Abstract
The efficiency coefficient of the boom machine working equipment is around 50%. When payload lifting in the bucket, gravity force of the working equipment performs useless operation. The piston air spring balances the working equipment gravity force and eliminates the indicated defect. The selection problem of the piston air spring parameters has been solved. The theory of the piston air spring and hydraulic power cylinders is supplemented by a new equation connecting the design parameters of kinematic triangles with parameters of hydraulic mechanisms of the boom machine working equipment.
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