To realize the moving of a detecting robot on the surface of heat exchanger bearing pipes in a boiler with spiral radiators around the pipes,a novel kind of compound wheel was developed.

A new type of inviolate-cydoid compound gear of chainless tractionmechanism is introduced as a result of performance analysis of two kinds of cornxnongear-pin rains.

And put forward a new type high torque hydraulic motor-compound gear motor, which has important application perspectives and practical value as one of high torque hydraulic motor.

Driven by servo motor,the compound cam connecting units drive upper and lower hook plate,making loading simple and stable,accurate and adjustable.

Mathematical modeling and application on motion analysis of compound gear trains;

Through the discussion on the teaching method of transimission ratio of compound gear train, the paper explains that in thesituation of gradually decreasing theory class hours, the teachers can also gain the expected teaching effect by means ofimproving teaching methods.

Numerical computation of inner flow passing through low specific speed compound impeller of centrifugal;

After an introduction to the operating principle and characteristics of the rotating jet pump, the design theory of the pump is emphatically expounded, and the method for calculating the structural parameters of its compound impeller with S-shaped blades is discussed.

Especially the flow of compound impeller in the centrifugal pump at low specific speed is more complex and has more problems need urgently to resolve.