Three-axle flatbed trailer - white

Product Overview

The flatbed trailer is mainly composed of main frame, front panel, container locks, axles, tires, suspension, lighting circuit system, ABS braking system(optional), toolbox, landing gear, side and rear protective devices and safety accessories.

Main Structure and Working Principle

Main frame

The main frame is the load-bearing body of the trailer, which is welded into a frame structure by two longitudinal beams and several channel shaped crossbeams. The transverse section of the trailer longitudinal beam is in the shape of an "I", and the material is high-strength steel plate, which has the characteristics of high strength, high stiffness, and light weight.

The frame is the load-bearing body of the trailer, welding or drilling on the longitudinal beam is not allowed without the technical guidance or permission of our company. Trailers are uniformly loaded, and concentrated loads are not allowed.

King pin

The king pin is the main key component connecting the trailer and the tractor. The model of the king pin should match the model of the tractor's fifth wheel. The trailers produced by our company are generally equipped with a diameter of Φ 89.8mm king pin without special instructions. According to user requirements, a diameter of Φ 50.8mm king pin can also be installed. The king pin of the trailer is connected to the king pin seat on the trailer through 8 units of M14*45-10.9 high-strength anti loosening bolts. When the vehicle is in use, sufficient automotive lithium based grease should be applied to the king pin and seat plate to ensure reliable lubrication.

The king pin should be regularly maintained, and the tightness of the fastening bolts and the wear degree of the king pin should be checked. When the neck of the king pin with a diameter of Φ 89.8mm wears down to Φ 86mm, or the neck of the king pin with a diameter of Φ 50.8mm wears down to Φ 48mm, it needs to be replaced. When replacing, use a wrench to loosen the 8 units of fastening bolts for replacement, but the 8 units of fastening bolts are disposable and cannot be reused. It needs to be replaced with new bolts.

Rope Winch

There are rope winches located under the side beams of the trailer for tightening ropes and fixing goods or tarpaulin during transportation. The rope winch mainly consists of a bracket, a shaft, an anti loosening gear, etc..

Operation method of the rope winch: Turn the brake teeth of the rope winch to the rope tightening state, wrap one end of the rope around the rope fixing column on the rope tightening shaft, wrap the rope around the rope tightening shaft a few times, and press the rope end tightly. Then insert the pry bar into the hole of the rope tightening shaft, rotate the rope tightening shaft clockwise, and slowly wrap the rope around the rope tightening shaft. As the rope is shortened, the rope is gradually tightened until it feels firmly fastened. Stop rotating and place the brake teeth in the teeth of the anti loosening gear. Thus, it prevents the rotation of the rope shaft and prevents the loosening of the fastening rope. When it is necessary to loosen the fastening rope, insert the pry bar into the hole of the tightening rope shaft. First, rotate the tightening rope shaft slightly clockwise to shift the brake teeth to the loose rope state, and then slowly rotate the tightening rope shaft counterclockwise until the tightening rope is completely released without tension.

Container lock

Container locks are mainly used to secure containers and consist of lock tongues and lock seats. The lock seats are equipped with grease fittings in the width direction. After a period of use, the lubrication of the locks should be checked and lubricated to ensure that the locks rotate flexibly. Container locks are divided into two types: welded and retractable. When transporting large-sized containers or other goods, the retractable container locks could be placed in the lock's placement slot, so that the lock is lower than the flatbed , thus avoiding the impact on the goods and facilitating the loading, unloading, and fixing of the goods.

The use of container locks: Adjust the lock longitudinally, align the bottom corner of the container with the lock, and then place it firmly. Hold the lock tongue and rotate the handle to rotate the lock tongue 90 ° to achieve the fixed locking of the container.

Landing gear

The landing gear is mainly composed of support legs, support leg connecting plates, and tension components. When the trailer is detached from the tractor, it is used to support the front load of the trailer. The support legs have two forms: linkage and single action. The structure of two forms is almost the same, consisting of a base, a screw transmission mechanism, an inner square tube, an outer square tube, a gearbox, and a control handle. The driven leg of the linkage type does not have a gearbox, and is connected to the active leg by a transmission connecting rod. Rotate the handle to raise and lower the landing gear. The lifting of the support legs has two speed ratios: fast and slow. When the rotation shaft of the support legs is pulled out, it is in fast speed, which is used for no-load and slow speed for heavy load.

Attention should be paid to the maintenance of the landing gears, and lithium based grease should be regularly injected into the gearbox to ensure reliable lubrication of the gears and easy lifting and lowering. When the trailer is detached, it must be parked on a flat cement road or a solid flat ground, and it is not allowed to use support legs on slopes or soft soil roads. The landing gears are not allowed to exceed the lifting height. When the lifting height is not enough, regular rectangular pillows can be used to cushion the landing gears base to an appropriate height.

Leaf spring hanger, suspension

The suspension mainly consists of front hanger, middle hanger, rear hanger, adjustable pull rod, non-adjustable pull rod, balance shaft, balance beam, U-shaped bolt, fixing seat of pull rod, upper and lower clamping plates for axle, and leaf springs. The suspension should be regularly maintained and serviced, and the lubrication condition of each tightening bolt and lubrication part should be checked regularly.

Pre tightening torque of each bolt:
Balance beam bolt:	M30	with cotter pin
Pulling rod shaft nut:	M14	120-160N. m
Adjustable pull rod locking nut:	M16	189-252N. m
Leaf spring blocking bolt:	M16	with cotter pin
U-bolt:	M24	680-850N. m

Axle, tire and wheel rim

The axle and wheels play a supporting, running, and braking role. The axle is composed of a shaft body, shaft head, hub, brake, etc. , and the wheel is composed of tire, rim, connecting bolts, etc. The axles are high-quality products from well-known domestic and foreign factories such as BPW, Fuwa and Ll. These axles are manufactured by specialized production lines of each factory, with advanced technology, good quality, high precision, strong and powerful, lightweight, and durable. The wheel rim model includes 8.25x22.5, 9.00x22.5, 8.5-20, 9.0-20 etc. The tire size includes 11.00R20, 12.00R20, 12R22.5, 315/80R22.5 etc.

Brake system and ABS

The trailer is equipped with dual air brake system, and the system mainly consists of air joints, air supply pipelines, control pipelines, emergency brake valves, air reservoirs, brake chambers, and wheel brakes. And ABS is optional for trailers.

Electric Circuit system

The trailer is equipped with an international standard circuit system that is compatible with the tractor. There are electric connection sockets on the front beam of the trailer. And it is equipped with brake lights, turn signals, reverse lights, license plate lights, fog lights, rear clearance lights, and triangular reflectors at the rear of the trailer. The front end of beam is equipped with front position lights and front clearance lights; There are multiple side indicator lights on both sides of the trailer. The voltage is 24V DC.

Main technical parameters

The specification of flatbed trailer as below:

Dimension:
Length:	12,550mm
Width:	2,550mm
Height:	1,600@unload
King Pin Location:	1,300mm from the front face of the front bolster.
Landing Gear Position:	2,650mm from the king pin.
Axle Spacer:	6,880mm+1,310mm+1,310mm
King Pin Height:	Approx 1,330mm with the chassis level
2. Weight:
Tare Weight:	~7,500kg
Max. Payload:	40,000kg
Gross Vehicle Weight:	~47,500kg
3. Steel Structure:
Frame:	The frame is made up of main beam, cross beam, side beam and steel plate.
Material:	High strength low alloy steel Q345B is used for welded I-beam and Q235 is used for the fabricated parts
Main beam:	“I” shape, welded by automatic submerged arc welding. Material is mild alloy Q345B, height 500mm.
Side beam:	Q235B channel beam, height 160mm.
Floor:	Checkered sheet, thickness 3mm.
Bulk head:	One bulk head (removable front panel).
4. Assemblies
King Pin:	JOST 2’’ (50#) bolted king pin, interchangeable with 3 1/2’’, model KZ1010.
Landing Gear:	2 speed road side winding with sand shoe. Lift capacity 28ton. Brand Fuwa, model FW28.
Suspension:	Heavy duty under mount tri-axle suspension with equalizers 10-leaf spring.
Axle:	Square axle, 13 tons capacity each, 3 axles. Brand Fuwa.
Tyre:	315/80R22.5 tubeless tyre, 12 pcs, none spare tyre.
Container locks:	12 twist locks, for 1x40ft, 2x20ft or 1x20ft container.
Brake System:	Dual air brake system. None ABS.
Brake Chamber:	Type 30/30 on the rear two axles, type 30 on the front axle.
Electrical System:	24 volt lighting system with modular wiring harness, 7 way ISO receptacle in front of the front bolster.
Light System:	standard
Side Guard:	standard
Tool Box:	Equipped one set
Spare tire carrier:	Two
Winch:	Standard manual winches for cargo, to be welded under left and right side beams.
Painting:	Color white.
Package:	Trailers with bolted rear part. 2 trailers in one container. With protector for side beam to reduce damage of painting.