What is the condition of self-locking in differential band brake? Why should it be avoidedin speed-control brakes? Explain self-energizing block brake and self-locking block brake

The condition of self-locking in a differential band brake occurs when the brake shoe is forced against the drum due to the rotation of the drum itself. This happens when the direction of rotation of the drum is such that it tends to tighten the brake shoe against the drum, increasing the braking force.

Self-locking in a differential band brake should be avoided in speed-control brakes because it can lead to excessive braking force and potential damage to the braking system. In speed-control brakes, it is important to have precise control over the braking force to maintain the desired speed. Self-locking can cause the braking force to become uncontrollable and may result in sudden stops or loss of control.

A self-energizing block brake is a type of brake that uses the principle of self-locking to increase the braking force. It consists of a block or shoe that is forced against a rotating drum by the action of a lever or cam mechanism. As the drum rotates, it tends to push the block or shoe harder against the drum, increasing the braking force.

On the other hand, a self-locking block brake is a type of brake that uses the principle of self-locking to maintain the braking force even when the actuating force is removed. It is designed in such a way that the braking force is self-sustaining and does not require continuous application of force to maintain the brake engagement. This type of brake is commonly used in applications where it is necessary to hold a load or prevent movement without the need for constant force application.