The invention relates to a self-adjusting type
crank drum type
brake which comprises a braking bottom plate. Two braking shoes in floating connection with the braking bottom plate are symmetrically arranged on the side face of the braking bottom plate. A
crank cylinder body is arranged at the upper end of the braking bottom plate. A
crank cam is installed in the crank cylinder body. Two side cylinder bodies extend from the exterior of the crank cylinder body. A
piston is installed in each side cylinder body. An adjusting screw rod, a
ratchet wheel and a plate are installed on the end portion of each side cylinder body. One end of each adjusting screw rod extends into the corresponding
piston, and the other end of each adjusting screw rod directly faces the braking shoes. An adjusting and pulling plate is installed at the front end of the crank cylinder body, one end of the adjusting and pulling plate is clamped with the plates, and the other end of the adjusting and pulling plate makestooth contact with the
ratchet wheels. The two braking shoes are mutually connected through a return plate spring. A pulling spring is further installed. According to the
brake, an automatic gap adjusting device is arranged in the
brake, the two braking shoes are adjusted independently, and the braking stability is improved. After braking, resetting is achieved through the return plate spring, due to the design of the return plate spring, enough space is reserved for assembling the brake, and the assembling efficiency is improved.