ZWZA, ZWZB ELECTROMAGNETIC AND DRUM BRAKE

Brake drum brake consists of brake shoe, brake arm, brake wheel and brake release. The brake wheel is usually installed on the rotating shaft of the mechanism as a half body of the coupling, the symmetrically arranged brake arms are hinged with the fixed part of the frame, and two brake pads with friction materials on the inner side are hinged on the two brake arms respectively. Under the action of the brake force on the brake release, the paired brake pads hold the brake wheel tightly in the radial direction to generate braking torque.

When the power supply is turned on, the iron core of the electromagnetic brake release attracts the armature to press against the push rod, and the push rod pushes the left brake arm to swing to the left, and the main spring is compressed. At the same time, the auxiliary spring for relieving pressure pushes the right brake arm to the right, and the two brake arms drive the brake shoe to separate from the brake wheel, so that the mechanism can move.

When the power supply is cut off, the iron core loses its magnetism and the attraction to the armature is eliminated, thus relieving the pressure of the armature on the push rod. Under the tension of the main spring, the two brake arms swing inward together to drive the brake shoe to hold the brake wheel tightly to generate braking torque. At the same time, the auxiliary spring is compressed. The braking torque is determined by the force of the main spring, and the auxiliary spring ensures the slack gap. The braking performance of block brake is largely determined by the performance of brake release.

Brake is characterized by simple structure, convenient installation, and balanced pressure generated by pairs of pads, so that the brake axle is not affected by bending load. It is widely used in cranes.

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