Breast focus rotary cutting type biopsy negative pressure stable control system and control method thereof

The invention relates to a breast focus rotary cutting type biopsy negative pressure stable control system and a control method thereof.The breast focus rotary cutting type biopsy negative pressure stable control system comprises a negative pressure generating device and a vacuum barrel with a negative pressure meter, the negative pressure generating device is connected with the vacuum barrel through an air path pipe, a connector is arranged in the middle of the air path pipe, two pipelines are led out of the lower portion of the connector, and the two pipelines are communicated with the negative pressure meter. Wherein one pipe is connected with the negative pressure sensor, the other pipe is connected with the thermal proportional valve, the negative pressure sensor and the thermal proportional valve are both connected with the PID control module, the negative pressure value is adjusted by controlling the size of an opening of the thermal proportional valve, and adjustment is controlled by the PID control m