The lifting mechanism of forklift truck is mainly to lift the movement of the piston in the hydraulic cylinder to the fork frame of forklift truck to achieve the effect of lifting or falling goods.
Before understanding its working principle, first of all, we understand the composition of the whole lifting mechanism: mainly composed of lifting hydraulic cylinder, lifting chain, guide pulley and regulating wheel frame forklift accessories. Its working principle is that the forklift lift hydraulic cylinder it is driven by the sprocket inner door frame, forklift frame up. The lower seat is on the outer door frame beam, and the upper end is connected with the inner door frame beam and sprocket. One end of the lifting chain of the forklift is connected with the lower part of the outer door frame, and the other end is connected with the fork frame around the sprocket. When the pressure oil is passed into the hydraulic cylinder, the piston rod forklift accessories move upward at the speed of V and drive the sprocket and the inner door frame to rise at the same speed.
According to the principle of moving pulley, the chain pulling fork frame rises and falls at a speed of 2V. When the forklift hydraulic smile full stroke end, the inner frame is in the extreme position above the outer frame, the forklift frame is in the extreme position above the inner frame. When the leakage of oil pressure, cargo or cargo forklift and other parts of the gravity drop. Forklift fork lifting as long as not only the role of the hydraulic cylinder, so the plunger, piston cylinder have applications. Early due to the influence of production condition, multi-purpose the plunger cylinder, but forklift truck outside the plunger cylinder open prone to leak, size, quality, and therefore more than today's forklift with piston cylinders, but some of the free lift forklift also USES two levels of hoist hydraulic cylinder, cylinder piston outside than inside the cylinder area is large, lifting, outer cylinder first action to drive the goods fork rose to limit position, and by the mechanical limit; When the pressure continues to rise, the inner cylinder will move and drive the inner door frame lifting; When falling, the inner cylinder is the first action, the outer cylinder after action.
