Inner container space monitoring device for slot machine and inner container monitoring method for inner container space monitoring device

The invention provides an inner container space monitoring device for a slot machine and an inner container monitoring method for the inner container space monitoring device. The device comprises a slot machine shell, an inner container, a motor seat, a motor, a draught line coiling wheel, a draught line, an inner container pressing counterweight, a tension sensor, a Hall sensor, a microprocessor module and a power module, wherein the inner container is arranged in the slot machine shell; the motor seat is arranged in the slot machine shell; the motor and the draught line coiling wheel are arranged on the motor seat respectively; the tension sensor is arranged on the draught line; the Hall sensor is arranged corresponding to the rim of the draught line coiling wheel on the motor seat; the tension sensor and the Hall sensor are connected with the microprocessor module respectively; and the power module is connected with the tension sensor, the Hall sensor and the microprocessor module respectively. According to the monitoring method, the descending distance of the inner container pressing counterweight is calculated according to the number of pulse signals transmitted by the Hall sensor and the preset wheel diameter of the draught line coiling wheel, and furthermore, the height of a residual space in the inner container is calculated according to the preset starting position of the inner container pressing counterweight.