Low bed Trailer

Go Heavy Trailer provides a wide series of conventional low bed trailer (lowboy trailer) to clients. Which can meet different road transportation requirements.

What is low bed trailer:

Low bed trailer is a kind of semi-trailer that has a super low cargo platform, the platform is also called drop-deck. And the low bed part has no sidewalls. Rear-axle numbers could be 2-4 axles. Mainly specialized for transportation of crawler crane, excavator, crawler loader, bulldozer, railroad equipment, and other crawlers/tires equipment. Benefit from the low bed design, the trailer has high trafficability to go through bridge arc and tunnel, and lowers COG(center of gravity) of cargo.

DIFFERENT TYPES OF LOW BED TRAILER:

Low Bed Trailer Classified by chassis design:

Flatbed type, the whole trailer platform is flat, equipped with loading ramp at the rear side.
Lowbed type, the trailer body has a drop-deck which is lower than the front goose neck and the rear wheel-set, due to the drop deck design, it always comes with a goose neck, so it is also called low bed semi-trailer

Classified by suspension:

Mechanical spring suspension low loader
-Non-steer axle
-Steering axle lowbed, widely used in high carrying capacity trailers with more than 4 axles. Could manufacture 6 axles, 7 axles and above steerable trailers.
Hydraulic pendulum axle lowboy, hydraulic platform trailer could be coupled with a low bed platform to transport oversize equipment over up to 200 tons
Pneumatic(air balloon) suspension lowbed trailer

Classified by loading ways:

Rear ramp loading: Equipped with a fixed neck at the front and a climbing ramp at the rear of the trailer, no need procedure to detach neck, just put down the mechanical/hydraulic ramp then you can load and unload equipment directly. By this means construction machines need the strong ability to climb the high ramp. Loaded by a ramp at the rear side of the trailer, because of trailer wheels, the height of the rear side is higher, so the loading ramp should be very long then the machine able to climb on it. Also, the height of the rear loading ramp will increase risks during the loading and unloading process.
Side-loading: This method requires a wide-open yard for the loading, which is hard to achieve in most scenarios. If goods are on a platform, and the height of the platform is near the height of the trailer’s deck, this would be a good solution for loading.
Front-loading: With detachable(removable) gooseneck, when removing the neck from a low bed trailer, the slope design of the front deck enables construction machines to climb up/down freely. This is the most efficient way for cargos loading and unloading, this type of trailer can be divided into two categories:
Low bed RGN trailer
Low bed folding gooseneck trailer

THE STEEL STRUCTURE DESIGN OF LOWBOY:

Chassis frame design: The chassis frame is the main loading steel structure of the lowboy trailer, so the design of it will be a key part of its usability. To make sure a safe transport of the cargo machines, the design of the loading platform is to make it as low as possible, that is why the chassis frame is drop-deck design.

Flatbed type, cargo platform is flat and on top of tires, to transport steel material, logs, and oversize equipment
Gooseneck type also called stair type trailer, cargo platform is lower than the top surface of gooseneck
Low drop-deck type, gooseneck, and rear part of the trailer are both higher than the middle part of the trailer, which makes loading of goods in a very low position
Future trend of chassis design is seeking lightweight, and high strength and rigidity

LANDING GEAR OF LOW BED TRAILER:

Landing legs are installed in the front of the lowbed trailer body, the function is to support the trailer so that tractor can be connected or disconnected easily
The landing gear is extended and retracted by manual operation, via lifting structure embedded in it
Reliable for maintaining the trailer’s level when it is disconnected from the prime mover
Simple design, but strong and rigid enough to adjust height rapidly
Bearing the weight of landing gears are no more than 50% of the trailer’s total mass
The safety factor is between 1.1 to 1.3

FEATURES OF LOW BED TRAILER:

The mechanical or hydraulic climbing ramp is an option for easy loading and unloading
Lower height (hydraulic and air suspension be able to adjust height)
Detachable gooseneck is an option
Small turning radius, up to 55° steering angle
Both automatically and manually all wheels steering
Drop deck minimize the trailer’s platform height, increase trafficability and stability for over height cargo
Side bracket is an option(for increase overall width), removable and swinging
The top surface of the loading platform is wood to anti-skidding. Optional diamond plate.

CONSISTS OF LOW BED TRAILER:

Chassis fame

Side beam structure, the longitudinal beam is molding I shape steel or welded I shape steel
The frame shape is stair shape or drop-deck shape, to minimize the height
The latitudinal beam is pressed steel

Suspension in Low Bed Trailer

Including tires, axle, brake, and rim
Axle and axle head are high-quality steel
Axle body is a rectangular section
Most lowbed trailers using mechanical spring suspension, hydraulic and pneumatic suspension are options for special cargos

land gear

Double speed type with one handle bar
Double speed type with two handle bar

Electrical system

Single wire system, negative ground, voltage 24
Rear lamps, steering lamps, outline marker lamps, side marker lamps, reflex reflector, rear fog lamp, license plate lamp

brake system

Emergency relay valve, air reservoir, spring energy reservoir chamber
Smooth and rapid brake
Good cooling performance
Trailer’s brake system is coordinated with that of the tractor prime mover, braking order is front wheels of the tractor, wheels of the trailer then rear wheels of the tractor
Dual-chamber brakes the trailer in parking mode when brake air pipe is disconnected with that the tractor
Double air-lines brake system. One line is a braking line, which is connected to the tractor’s air reservoir, it’s charging air to the trailer’s reservoir all the time. Another line is the controlling line, which is connected to the tractor’s dual-chamber. There is no air in the controlling line in common situation, when the driver brakes tractor, compressed air from the tractor’s reservoir will be sent to the emergency valve of the trailer, then the emergency valve will release compressed air from trailer’s reservoir to trailer’s brake chamber. The advantage of the dual-line braking system can charge the reservoir all the time when climbing down from a slope, if leakage happens and the pressure is lower than the stipulated air pressure, the emergency can stop the trailer automatically
Brake system is able to park the trailer with a full load on a 16% slope road
Brake time between brake of the prime mover and brake of lowboy’s last axle is less than 0.2s
Leakproofness: When air reservoir pressure reaches 637kPa-735kPa, in non-brake condition, air pressure dropping speed is not more than 10kPa/10min. In brake condition, air pressure dropping speed is not more than 10kPa/6min

loading ramps

Front-loading ramp
Hydraulic rear loading ramp
Mechanical rear loading ramp
Removable rear loading ramp

SPECIFICATIONS OF LOWBOY:

Loading capacity: 30-150 tons
Length and width dimensions available custom made
Heavy duty and extra durability designed I beam
High tensile steel Q345B(or above) welded by automatic submerged-arc process
Top flange 14mm, middle flange 6mm, bottom flange 16mm, width 140mm
Axle numbers: 2 axles, 3 axles, 4 axles
Axle brands: BPW, L1, YORK or FUWA
Option for more axles than 4 if choose the hydraulic axle
Suspension: mechanical, hydraulic or air suspension
Leaf spring: 8 pieces
Ramp: mechanical spring or hydraulic lifting ramp
Traction pin: 2″ bolt-in
Spare tire: one set spare tire with tire carrier
Braking system: WABCO RE 6 ABS relay valve, T30/30 spring brake chamber, 45L air tank
Lights: 24 volts, 7 pins socket. Traffic warning signs
Heavy-duty landing gear: two speeds, manual operating
Painting: complete chassis sandblasting to clean rust, 1 coat of anticorrosive prime, 2 coats of final paint
Accessories: one standard toolbox

MAINTENANCE OF LOWbed trailer:

Tires inspection

Check the pressure of tires every month, refill air if the pressure lower than standard pressure
The pressure cannot be very high which may impact driving safety. If the tire has a crack, it should be replaced accordingly

Battery maintenance

Check if the battery is fixed up, battery liquid has to be in the middle position
Fill with electrolyte or distilled water if the liquid is short
Remain contacts of positive and negative electrode are fine
Keep the battery dry and clean
Take electrodes off if put the lowbed in storage for a long time
Recharge the battery if it’s low

Long-term storage

Avoid sunshine, damp
The storage room has ventilating air, fire equipment
Regular maintenance according to the manual
Anti-rust process before long time storage

LOADING RAMP OF LOW BED TRAILER:

Mechanical ramp
Hydraulic (folding) ramp.