The traditional low-bed trailer can not meet the demand of long cargo transportation in many cases. As required, we design the extended flatbed trailer according to different lengths of cargo. The cargo loading platform can be extended and retracted freely.
Forced steering is the most commonly used steering form for the extendable trailer, and knuckle steering is the most common form of extendable flatbed trailer steering for sale. It is important that the maximum steering angle can reach 45 degrees.
According to the automobile theory, if the vehicle can turn normally, the value of the wheel angle must comply with the Ackerman angle theory, that is, the normal of each vehicle intersects at a point, which is called the steering center of the vehicle. When the vehicle turns, the all-wheel steering system on an extended flatbed trailer can make each wheel coordinate according to the angle value in Ackerman angle theory during the whole turning process of the vehicle, so that each wheel is basically in a rolling state during turning and driving. When a general vehicle turns, the wheel angle can not meet the value in Ackerman angle theory, so there is serious friction between the wheel and the ground in the process of turning. It shows a large turning radius and sideslip.
According to statistics, tire wear accounts for the main part of the operation and maintenance cost of extendable trailers. The selling price of a semi-trailer using all-wheel steering technology is higher than that of an ordinary low-bed trailer, but considering the long-term use, it is more economical because the trailer is in good condition, has fewer maintenance times, and less tire replacement times.
Compared with the semi-low loader trailer whose wheels do not have a steering function, the extendable flat trailer for sale whose wheels have a steering function needs less road width in the process of steering. the minimum turning radius of the hydraulic force steering is much smaller.
Helps Fuel Economy
Compared with nonsteering semi-trailer and semi-trailer with hydraulic steering system, semi-trailer with all-wheel active steering system has better fuel economy.
Most extendable trailers for sale with low loading and unloading surfaces can be extended laterally. This function is mainly realized by steel, aluminum, or wooden rotating arm or telescopic arm. On some heavy-duty trailers, hydraulic lateral extend arms are also equipped. At present, a three-stage extension can be realized at most. Longitudinal extension inevitably requires the energy supply of the transmission device to extend in the same direction. To this end, a device called an "energy chain" is most used today. By fixing the pipeline in the "energy chain", the damage to the pipeline caused by the lifting process can be effectively avoided.
The effective length of the dock(mm)
Width of the dock(mm)
Height of the dock(mm)
Each axle of maximum load(kg)
Gooseneck for truck
Amounts of tire
Total NO. of
No. of turning axle
Leaf spring suspension
Europe and Asia II
TECHNICAL WEIGHT(in kg)
Maximum load on kingpin
Maximum load on wheels
The Extendable Trailer is composed of a gooseneck, telescopic boom, suspension, steering mechanism, hydraulic power pack, etc.
The hydraulic gooseneck replaces the rigid gooseneck to transmit the traction force and acts as part of the trailer load on the tractor through the gooseneck so that the tractor does not need to add additional counterweight installed to ensure the traction force, but also plays the role of trailer load sharing. However, because the gooseneck and the trailer cannot rotate in the horizontal plane, the steering of the trailer is realized by driving the steering hydraulic cylinder by the rotation angle between the tractor's fifth wheel and the gooseneck.
The suspension is composed of wheels (including tires and hubs), supporting hydraulic cylinders, fixed arms, swing arms, brake chambers, etc. Its main function is to transfer all forces and moments acting between the wheels and the body, such as supporting force, braking force, driving force, etc., and to realize the driving and steering of the trailer
The telescopic boom adopts a large number of integrated technologies, and the high-strength welded steel plate material with yield strength up to 685MPa is selected. The box-designed chassis structure increases its strength and rigidity. In terms of manufacturing, the assembly and welding technology of tooling sections is adopted to ensure the accuracy of the telescopic boom.
In the process of hydraulic system design, modular design technology is widely used in our trailers. For example, the functions of hydraulic source control, lifting control and steering manual/remote control are integrated into the hydraulic control box, and the four-way valve and stop valve are integrated into a hydraulic valve block.
In mechanical tie rod type steering, the steering angle is generally 50°. According to the requirements of the client, the steering mode can be realized, such as splay, half splay, or diagonal. And the steering system is simple, reliable and low-cost. The tie rod steering mechanism first appeared in our modular trailer and then was transplanted to the extendable trailer.
In order to effectively quality of the oil cylinder, we cooperate with many excellent suppliers to devote themselves to R & D, and specially customize the sealing ring, which has remarkable oil leakage prevention effect, and the arrangement of the oil cylinder is more reasonable. After the oil cylinder is assembled, a 100% pressure test and top test are carried out to ensure that it leaves the factory without defect.
As a new process, electrophoresis + powder spraying not only saves energy and environmental protection but also further improves the product quality and further enhances the corrosion resistance and durability of the product.
We have improved the structure and stress of the extendable drop deck trailer, strengthened the chassis with a series of stiffeners, and achieved effective torsion resistance.
Our extendable trailer for sale is made of solid materials, not just good materials. The vehicle not only pays attention to the massiness and firmness of key parts, but also has many design details.
Our extendable flat trailer for sale adopts 100% full thickness wear-resistant steel, and the bottom plate does not need hot-rolled plate. Extruded cold hardening steel is adopted.
All the gas pipelines are anti bending and anti torsion gas pipelines to prevent air leakage.