Hoisting beam mechanism of hoist for laying cable in tunnel

The invention discloses a hoisting beam mechanism of a hoist for laying a cable in a tunnel. The hoisting beam mechanism comprises a hoisting beam bracket, a hoisting cross beam, a motor unit, a pulley block and a hydraulic lifting gantry. The hydraulic lifting gantry comprises a pedestal, an inner gantry, an outer gantry and a hydraulic cylinder. The inner gantry comprises an inner gantry left stand column and an inner gantry right stand column. The bottom end of the inner gantry left stand column and that of the inner gantry right stand column are separately fixed to the pedestal. The outer gantry comprises an outer gantry cross beam, an outer gantry left stand column and the outer gantry right stand column. The hydraulic cylinder is arranged in the inner gantry. An output shaft of the hydraulic cylinder is connected with the outer gantry cross beam. The hoisting beam mechanism is high in safety, high in working efficiency, reduced in production cost, and convenient for cooperation, saves lots of space for