What Are Forklift Cylinders?

Forklift truck door frame is the main load-bearing structure of the forklift load handler. The mechanism for lifting goods is also called the mast. It consists of inner mast, outer mast, fork frame, fork, sprocket, chain, lifting cylinder and tilting cylinder.

Forklift truck door frame is the main part of the forklift load handler

The mechanism for lifting goods is also called the mast. It consists of inner mast, outer mast, fork frame, fork, sprocket, chain, lifting cylinder and tilting cylinder.

According to the requirements of the lifting height of the forklift, the forklift mast can be made into two or more stages. Common ordinary forklifts usually use two-stage masts. Commonly there are three sections of full free masts, two sections of full free masts and two sections of standard masts. Among them, the full free mast is usually called a container mast because it can work in a container.

The two-stage mast is composed of an inner mast and an outer mast. The fork and the fork suspended on the fork rack are moved up and down along the inner mast by means of a fork rack roller, which drives the goods to rise or fall. The inner mast is driven up and down by a lifting cylinder and is also guided by a roller. There are tilt cylinders on both sides of the back of the mast to make the mast tilt forward or back Pick up and stack cargo.

The lower end of the outer door frame is hinged on the frame, and the middle part is hinged with the inclined oil cylinder. Due to the expansion and contraction of the tilting cylinder, the mast can be tilted back and forth (the inclination is generally 6 ° ~ 12 °), which stabilizes the fork and the cargo during the transportation.

The inner mast is provided with rollers and is embedded in the outer mast. When the inner mast rises, it can partially extend out of the outer mast. The fork rack has wheels, which are embedded in the inner mast and can move up and down. The bottom of the lifting cylinder is fixed at the lower part of the outer mast, and the piston rod of the cylinder moves up and down along the lead rod on the inner mast. The top of the piston rod is equipped with a sprocket. One end of the lifting chain is fixed on the outer mast, and the other end is connected to the fork rack by bypassing the sprocket. When the top of the piston rod is lifted with a sprocket, the chain lifts the fork and the fork rack together. At the beginning of lifting, only the fork is lifted, and the inner mast can be driven to rise after the piston rod reaches the inner mast. The inner mast's rising speed is 1/2 of the fork.

The maximum height that the fork can lift when the fork is lifted and the inner mast is not moving is called the free lift height . The general free lifting height is about 300 mm. After the fork frame is lifted to the top of the inner mast, the mast that the inner mast and the fork frame are raised at the same time is called a fully free-lift mast . Forklift sprocket wheels of more than 10 tons are mostly fixed directly on the top of the inner mast. The lifting cylinder lifts the mast from the beginning, so it cannot be lifted freely. A free-lift forklift can enter a slightly higher door opening. The fully free-lifting forklift is used in low places, and it does not cause the disadvantage that the fork cannot be raised to the prescribed height because the inner mast is roofed to the roof, so it is also suitable for operation in the cabin and container. In order to make the driver have a better field of vision, two lifting cylinders are used and arranged on both sides of the mast, which is called a wide field of vision mast. This type of mast gradually replaced the ordinary mast ^[1] .