Some common applications of springs in cotton picker machines include:

1. Tension springs: These are used to apply a resisting force when the spring is pulled or stretched. Tension springs are often used in mechanisms that require pulling and retracting movements, such as in the picker heads or in the harvesting mechanism.

2. Compression springs: Compression springs are designed to absorb and store energy when compressed, providing stability and cushioning. They are commonly used in cushioning systems, shock absorbers, or to maintain alignment of components in the cotton picker machine.

3. Extension springs: Extension springs are used when a pulling force needs to be exerted to extend the spring to its full length. They are often found in parts of the cotton picker machine that require extending and retracting movements.

4. Torsion springs: Torsion springs are used to provide torque or rotational force to components that need to move in a circular motion. They are commonly used in mechanisms that require twisting or rotational movements in the cotton picker machine.