There are mainly the following categories of swing cylinders:
1. Rack and pinion type: This oil cylinder drives the rack to reciprocate through a linear oil cylinder, so as to realize the swing of the gear meshing with the rack. It is suitable for transmitting large torque, simple installation, convenient use and low price. However, the external dimensions are large and occupy more space.
2. Vane type: This type of oil cylinder is the radial arrangement of the blades. Hydraulic oil acts on the blades and finally realizes the rotation of the drive shaft. The advantage is that the moment of inertia is small, the action is sensitive, and the rotation is even and the pulse is small. The weakness is that the leakage is large, it can not work at very low speed, and the mechanical characteristics are soft.
3. Spiral type: This type of cylinder is between the inner spiral of the casing and the outer spiral of the spline sleeve, The relative movement realizes the output rotation of the shaft (flange). Its characteristics are compact structure and high reliability. Smooth operation and extremely low speed. But the processing is difficult and the cost is high.