Energy-saving friction-free step braking device and braking method

The invention provides an energy-saving friction-free step braking device and method, and relates to the technical field of braking equipment. According to the energy-saving type friction-free step braking device and method, kinetic energy of equipment can be converted into compressed gas energy in the energy accumulator to be stored in the braking process, an oil pump needs to be started except for leakage caused by first-time brake opening and long-term oil way use, the oil pump does not need to be started in the normal braking and brake opening switching process, and therefore the energy-saving type friction-free step braking device is convenient to use. The starting frequency of the oil pump is extremely low, and the purpose of saving energy is achieved; in the braking process, the brake wheel is in rolling contact with the rolling wheel, the torque applied to the brake wheel by the brake oil cylinder through the rolling wheel is also increased in a stepped mode, when the torque applied to the brake wheel