Air suspension came into being in the mid-19th century. It has gone through many stages, such as pneumatic spring, airbag composite suspension, semi-active air suspension, central charging and bleeding suspension, etc. it was not applied to trucks, buses, cars and railway vehicles until the 1950s.

What are the main advantages of air suspension compared with other types of suspension?

1. Light weight. Compared with leaf spring, the biggest advantage of air suspension is light weight and obvious advantage in self weight.

2. Liftable. It can be lifted in two aspects. First, it can be lifted through air suspension to reduce wear and save fuel. It is especially suitable for one-way empty vehicles. Second, through the manual height valve in the air suspension system, the height of the vehicle loading platform can be adjusted within a certain range to facilitate loading and unloading of goods.

3. Smooth driving, good shock absorption. Compared with lightweight vehicles, vehicles with air suspension drive more smoothly. The height of the air spring can be automatically adjusted according to the road conditions to reduce vibration, which is conducive to the safety of goods.

The most common fault of air suspension is air bag wrinkle or air bag with little or no air. The reasons for these two situations are different, and the treatment methods are also different.

1. Airbag wrinkles.

reason:

(1) When the vehicle is transported and hoisted, the air bag is stretched out more and not reset normally, resulting in air bag wrinkles;

(2) When vehicles enter and leave the maintenance workshop or large slope platform, individual airbags may also be stretched excessively, resulting in airbag wrinkles.

Treatment method:

Disassemble the rubber connector under the horizontal height valve, lift the rod upward, and then install the rod back after all airbags are fully inflated, and the airbag can return to normal state.

In addition, if such faults often occur during driving, it is necessary to consider adding a limit device between the axle and the frame.

2. There is little or no air in the air bag.

reason:

(1) The special air cylinder for air suspension has no air or low pressure. When the air pressure of the trailer is lower than 6kg, the pressure protection valve will suspend the air supply to the air suspension air cylinder to ensure that the braking system maintains sufficient pressure;

(2) The air pipeline is blocked or discounted and cannot pass the air;

(3) The connecting rod of the horizontal height valve falls off;

(4) The level valve is damaged.

Treatment method:

The air source of the air suspension is connected from the braking system, passes through the pressure protection valve and is stored in a special air reservoir. During operation, it passes through the filter to the horizontal height valve of the air suspension, and then to the left and right airbags. When there is little or no air in the airbag, as long as you find the correct cause of the fault, you will know where to start and it will not be difficult to solve it.

After the promulgation and implementation of gb7258-2017 national standard for safety technical conditions for motor vehicle operation, it is required that three axle barrier plate and warehouse grid semi-trailer must be equipped with disc brake and airbag suspension, otherwise it will affect the vehicle's license plate or road driving. In this way, the use of air suspension will be more and more widely. The air suspension series of Shandong Darong group is forged with 3D forming technology, which has better toughness and stronger sealing. It can calmly filter the impact caused by bumpy road on the frame, and greatly reduce the load and stress. With Darong disc axle, it can ensure driving safety, reduce or avoid cargo loss, improve operation efficiency and increase economic benefits.