Rotary braking mechanism of detector

The utility model discloses a rotary braking mechanism of a detector. The rotary braking mechanism of the detector comprises a base, a vertical pillar, a rotary mechanism, a braking mechanism body, a cantilever, a flat panel detector, a high-pressure bulb pipe and a beam-limiting device. The braking mechanism comprises a large gear, a pinion rack and a linear electromagnet, wherein the rear portion of the pinion rack is connected with the linear electromagnet, a limiting notch is formed in one side of the large gear, a limiting block is arranged on the cantilever, and the cantilever is in a rotary locking or 90-degree free rotation state by controlling pushing or contracting of the linear electromagnet. A photoelectric sensing assembly is installed at the limiting notch, and components of an inducing device are arranged around the machine and are convenient to install and maintain. The rotary braking mechanism of the detector is free of the problem that the meshing gap between the gears is enlarged, simple in