Detection device and detection method for automatic doffing yarn holding cross beam

The invention relates to a detection device and method for an automatic doffing yarn holding cross beam, the holding cross beam is provided with a first air channel and a second air channel in the transverse direction, an air bag of a yarn holder installed on the holding cross beam is communicated with a corresponding air hole, and a positioning column is arranged in a corresponding positioning hole and sealed; the working gas circuit unit is used for providing power for holding and releasing a bobbin for an air bag of the yarn holder, and comprises an external air pipe, a first air inlet pipe, a first electromagnetic valve, a first pressure reducing valve and a vacuum generator; the pressure maintaining air path unit is used for inflating and maintaining pressure of a second air path and monitoring the air pressure in real time, and comprises a second air inlet pipe, a second electromagnetic valve, a second pressure reducing valve and a pressure monitor; the pipe leakage monitoring unit is used for monitorin