The reliable method is to sleeve the hollow shaft on the solid shaft, transfer the torque with the key and add the fixing bolt to prevent the axial force. If one side of the outer diameter of the two shafts is thick, the mixing shaft does not need solid shaft support, and can be connected by coupling, otherwise the two shafts need rigid connection. A solid shaft can be turned into a stepped shaft, inserted into a hollow shaft and welded with a large groove. At the same time, the intersection of hollow shaft and solid shaft can be drilled, and the pin shaft can be welded externally to further enhance the reliability. If the solid shaft is connected to the shaft connector, the axle connector can be directly made on the hollow shaft and welded directly. Scheme 1: welding the agitator hub and shaft; Scheme 2: Thin flat key is used to transmit torque, but it is necessary to check whether the steel pipe strength after keyway planing meets the requirements. If it does not meet the requirements, it is necessary to thicken the steel pipe or choose other schemes. After the thin flat key is adopted in this scheme, the transmission torque of the key per unit length is smaller than that of the ordinary Ping Jian, and the hub is relatively long; Scheme 3: welding a solid shaft on the shaft head of the hollow shaft; Scheme 4: Through-shaft bolts are adopted. This method requires plug welding of solid steel pipe in the through shaft, which is relatively complicated to manufacture and is not recommended. Option 5: To transmit torque by thread, inertia and screw scheme should be considered. Remember, there is locking. Scheme 6: The blade is directly welded on the steel pipe, depending on the blade width. If the arc length of the wheel hub is too short, a thicker plate is needed, so it is not necessarily economical or balanced to save the wheel hub. Scheme 7: coupling is recommended for connection, but other methods have defects: 1, and welding has deformation and disassembly problems. 2. Ordinary Ping Jian is not well stressed, and it is easy to damage the key or keyway; Spline manufacturing is difficult and costly. 3, interference fit is not convenient for disassembly.