What is the function of semi-trailer support device? What are the requirements for it? Come on, come on, you'll get points.

Semi-trailer support device, commonly known as-leg. Based on the principle of "standing on the wooden roof", it is located at the front end of the semi-trailer frame for use after the semi-trailer is separated from the tractor. Legs are generally composed of left and right mechanical legs, which are operated by hand, with two-speed single action and linkage. But now a motor device is also installed on the original leg, which can be used as electric. The main components of the leg are two-speed gearbox, support sleeve, support rod, transmission screw (crank) and support plate. The structure is very simple and the function is very important.

Placement position map

Single leg is also called "one tube, one tube"

The linkage leg is also called "one tube and two"

Leg structure diagram

Interpretation of two-speed legs: there are two speeds for shaking legs, which are suitable for no-load and heavy load respectively. The first gear is slow, that is, pull out the rocker and shake it, which is suitable for heavy loading. Another gear is fast, which is to push the rocker into the gear of the gearbox. The acceleration of swing speed is suitable for putting legs or no load.

● Precautions for operating outriggers:

1. You can use fast gear or slow gear when there is no load. However, it is forbidden to use fast gear when overloaded.

2. Pay attention to whether the ground is flat when leaving the tractor. When necessary, the supporting plate should be padded with wooden boards to ensure that the supporting surface is basically horizontal.

3. When the leg is put away, the rocker must be put back in its original position. If you kick your leg when you walk, your leg will be damaged.

● Maintenance items:

1. Always check the fastening of leg bolts to prevent looseness and loss of support.

2. After using for one year or 30,000 kilometers, add lithium-based grease to ensure the normal use of gear parts.

Bian Xiao concluded: Card friends should not underestimate and ignore the importance of legs. The basic parts of any semi-trailer have simple legs. In addition, the legs also need care and maintenance. Regular maintenance of the legs will also make the car run more smoothly and ensure the safety of goods and trailers when loading and unloading tractors.