Dump semi-trailer truck
A dump truck is a vehicle equipped with an automatic tipping device in its cargo box. Also known as a tipper truck or engineering vehicle, it consists of a chassis, hydraulic lifting mechanism, power take-off (PTO), and cargo box. In civil engineering, it is often used in conjunction with excavators, loaders, and belt conveyors to form a loading, transporting, and unloading production line for earthwork, sand, gravel, and loose materials. Because the cargo box can automatically tip at a certain angle to unload, it greatly saves unloading time and labor, shortens the transportation cycle, improves production efficiency, reduces transportation costs, and clearly indicates the loading capacity. It is a commonly used transportation machine. Brief introduction: The engine, chassis, and cab are constructed similarly to those of a general heavy-duty truck. The cargo box can tip backward or sideways, controlled by a piston rod movement via a control system. Rear tipping is more common, pushing the piston rod to tip the cargo box. A few models feature bidirectional tipping. High-pressure oil enters the lifting hydraulic cylinder through a distribution valve and oil pipes. The front of the cargo box has a safety guard plate for the cab. The hydraulic tipping mechanism of the truck bed consists of an oil tank, hydraulic pump, distribution valve, lifting hydraulic cylinder, control valve, and oil pipes. The engine drives the hydraulic pump through the transmission and power take-off. High-pressure oil enters the lifting hydraulic cylinder through the distribution valve and oil pipes, pushing the piston rod to tip the truck bed. Rearward tipping is more common. The piston rod movement is controlled by the operating system, allowing the truck bed to stop at any desired tilt position. The truck bed returns to its original position using its own weight and hydraulic control. The main technical parameters of a dump truck are its load weight and load capacity. New trucks or trucks undergoing major repairs must be test-run to ensure a smooth and stable lifting process. During use, all parts should be lubricated with the correct type of lubricant as specified, greatly saving unloading time and labor. Pay attention to the lubrication cycle, and strictly change the oil in the lifting mechanism on schedule. Load according to the rated load capacity; overloading is strictly prohibited.
Oil Tanker Semi-Trailer
Oil tanker semi-trailers are mainly used for transporting large quantities of oil, with a tonnage generally around 40-60 cubic meters. Oil tanker semi-trailers are typically available in two-axle and three-axle configurations. The square tank body is constructed from Q235A steel plate, with multiple reinforced anti-surge baffles inside. The baffles have through holes at the bottom to reduce the impact of the oil inside the tank during vehicle movement and to increase the tank's strength. The combined tank opening is located at the top of the tank, with a self-locking small cover on top of the large cover. A breather valve is installed on the upper side of the large cover to ensure consistent atmospheric pressure inside and outside the tank; it is equipped with a static grounding wire. An oil pump system is installed, drawing power from the gearbox side via a power take-off, allowing for self-priming and self-draining; it has two oil suction pipes with quick-connect couplings, a suction lift of 6 meters. Two fire extinguishers and special tools are included. The oil tanker semi-trailer consists of two parts: the tank body and the supporting frame or bracket. Troubleshooting and repair methods: 1. Ineffective or slow braking. Causes: 1. Excessive clearance between brake shoe friction pads and brake drum; adjust clearance accordingly. 2. Excessive wear of brake shoe friction pads; replace brake shoe friction pads. 3. Damaged air chamber; replace air chamber. 4. Air leakage in the air braking system causing pressure drop; check for leaks and repair or replace parts. 5. Malfunctioning emergency relay valve; replace it. 6. Inability to release the brake, slow brake release: Causes: System pressure too low; increase air braking system pressure to the specified value. 7. Damaged brake return spring; replace spring. 8. Blocked pipes; check and clear blockages. 9. Malfunctioning emergency relay valve or quick-release valve; check and replace it. 10. Incorrect brake chamber push rod stroke; readjust. 3. Tire wobbling: Causes include loose wheel nuts (tighten them), sintered or damaged axle bearings (replace the bearings), bent axle (correct or replace the bearings), excessive axle bearing clearance (correct and replace the bearings), properly tightening the bearing lock nuts, timely replacement of bearing lubricant, and replacement of the axle bearings; excessive tire wear, severely excessive perpendicularity between the axle axis and the frame centerline (adjust the distance between the two ends of the axle and the towing pin as evenly as possible).
4. Excessive cranking resistance: Causes include poor lubrication (add lubricant), damaged bearings (replace the bearings), eccentric or severely worn gears (disassemble and inspect, replace parts), and damaged lead screw threads (replace the lead screw).
Light Semi-Trailers
Ultra-light semi-trailers, as the name suggests, are much lighter than ordinary semi-trailers. How much lighter does it have to be to qualify as ultra-light? The industry definition is a semi-trailer with a similar load capacity and size to an ordinary semi-trailer, but weighing more than 15% less. Several factors can help make a semi-trailer lighter: 1. Reduce the thickness of the sheet metal. This can be achieved by using higher-grade steel. 1. High-strength steel: high strength, good toughness, and fatigue resistance.
2. Reduce rear axle weight. The axle plus suspension weighs nearly two tons. Lightweight axles, disc brakes, 4-leaf springs, new-style hangers, tubeless tires, and single tires are all effective solutions.
3. Variable suspension. Air suspension is sufficient, but this is less common.
4. Reduce the weight of accessories. Reduce the weight of bumpers, side guards, mesh spare tire racks, toolboxes, tarpaulin racks, etc.
5. Another option is a suspended rear axle, also known as the last axle, which can be lifted when not in use. The most common method is to use high-strength (domestic high-grade) steel to reduce weight. High-strength steel semi-trailers are lighter than ordinary carbon steel light semi-trailers. Using imported Swedish high-strength steel and optimizing the semi-trailer design, the semi-trailer's weight is reduced by more than 1.3 tons without changing the load capacity, effectively improving vehicle efficiency. Product Name: Ordinary Carbon Steel Light Semi-Trailer; High-Strength Steel Light Semi-Trailer; 13-meter Flatbed Semi-Trailer (7.0 tons, 5.98 tons); 13-meter Stake Semi-Trailer (7.7 tons, 6.68 tons); 13-meter Box Semi-Trailer (8.1 tons, 7.08 tons).
Vehicle Transport Semi-Trailer
Vehicle transport semi-trailers feature a stake structure design for the cargo area. Primarily for sedans, but can also carry vans, commercial vehicles, jeeps, and other passenger cars. 1. The body uses a rod-and-frame structure, resulting in a lightweight and sleek design. Most have two loading platforms, using hydraulic cylinders and wire rope pulleys for smooth lifting and multiple height settings. 2. Lightweight Structure: The entire vehicle uses a truss structure with a single-frame load-bearing structure, eliminating the longitudinal beams found in other semi-trailers, resulting in a weight reduction of approximately 30% compared to similar vehicles. 3. Safe and Convenient Operation: All loading and unloading platform lifting controls are reliable, allowing for clear observation and accurate operation. 4. Suspension system: It adopts a unique under-mounted leaf spring suspension system with variable cross-section leaf springs, which provides good ride comfort.
