A double-hoist, double-spreader bridge crane experimental facility comprises a trolley fixed on the supporting frame of a gantry, the trolley is connected with the gantry through a driving mechanism, lift control motors are respectively arranged on both sides of the trolley, reels connected with the motors are connected with spreaders through swing ropes, swing angle-measuring devices are arranged on the lower end of the trolley, and
signal processors are arranged on the upper end of the trolley; each swing angle-measuring device comprises a rotary rocker
assembly arranged inside, the rotary rocker
assembly comprises a big semicircular rocker and a small semicircular rocker which are crossed by each other, and
grating measuring devices are respectively arranged on one end of the big semicircular rocker and one end of the small semicircular rocker; each
grating measuring device comprises a
grating disk, a lens and an indicating grating are arranged by both sides of the grating disk, an LED (light-emitting
diode)
point light source is arranged by one side of the lens, and a photoelectric element is arranged by one side of the indicating grating, and is connected with one of the
signal processors through a
signal cable. The double-hoist, double-spreader bridge crane experimental facility does not need additional sensors or detectors, the cost is low, the structure is simple, and the double-hoist, double-spreader bridge crane experimental facility is convenient to use.