Dump truck semi-trailer
A dump truck is a car with an automatic dumping device in the cabin. It is also called a dump truck or an engineering truck. It consists of a car chassis, a hydraulic lifting mechanism, a power take-off device and a cargo compartment.
In civil engineering, it often works together with excavators, loaders, belt conveyors, etc. to form a loading, transporting and unloading production line for loading and unloading earth, sand and gravel, and loose materials.
Because the loading compartment can automatically tip over at a certain angle to unload, it greatly saves unloading time and labor, shortens the transportation cycle, improves production efficiency, reduces transportation costs, and indicates the loading volume. It is a commonly used transportation machinery.
Introduction: The structure of the engine, chassis and cab is the same as that of a general truck. The compartment can tip backward or sideways. The piston rod movement is controlled by the operating system. Backward tipping is more common, and the piston rod is pushed to tip the compartment. A few two-way tipping. High-pressure oil enters the lifting hydraulic cylinder through the distribution valve and oil pipe, and there is a cab safety protection plate at the front end of the compartment. Carriage
The hydraulic tipping mechanism consists of a fuel tank, a hydraulic pump, a distribution valve, a lifting hydraulic cylinder, a control valve and an oil pipe. The engine drives the hydraulic pump through the transmission and the power take-off device. The high-pressure oil enters the lifting hydraulic cylinder through the distribution valve and the oil pipe, pushing the piston rod to tip the car. Backward tipping is more common. By controlling the movement of the piston rod through the operating system, the car can be stopped at any desired tilting position. The car uses its own gravity and hydraulic control to reset.
The main technical parameters of dump trucks are loading weight, and the loading volume is indicated. New cars or overhauled cars must be tested to ensure that the lifting process of the car is smooth and without stringing. When using, all parts should be correctly selected according to regulations to greatly save unloading time and labor. Pay attention to the lubrication cycle, and the lifting mechanism should strictly change the oil on schedule. Ship according to the rated load, and overloading is strictly prohibited.
Oil tanker semi-trailer
Oil tanker semi-trailers are mainly used for large-scale oil transportation, with a tonnage of generally around 40~60 cubic meters.
Oil tanker trailers usually include: two-axle trailers and three-axle trailers. The square tank body of the oil tanker trailer is made of Q235A steel plate. The tank body has multiple reinforced wave-proof baffles built in. There are through holes at the bottom of the baffles to reduce the impact of the oil in the tank body during driving and improve the strength of the tank body. The combined tank mouth is located at the top of the tank body. There is a self-locking small cover on the large cover. A breathing valve is installed on the upper side of the large cover to ensure that the atmospheric pressure inside and outside the tank is consistent; with an electrostatic grounding wire. Install an oil pump system, which takes power from the gearbox side through a power take-off, and can be self-priming and self-draining; with two oil extraction pipes, equipped with quick-release connectors, and a suction range of 6 meters. Two fire extinguishers and special tools. The oil tanker trailer is divided into two parts, the oil tank body and the frame or bracket that supports the tank body.
Faults and repair methods:
- Ineffective braking and slow braking Cause: The gap between the brake shoe friction plate and the brake drum is too large, adjust the gap. The brake shoe friction plate is excessively worn, replace the brake shoe friction plate. The air chamber is damaged, replace the air chamber. The air brake system leaks and the pressure drops. Check the leaking part and repair or replace the parts. The emergency relay valve is not working properly and should be replaced.
- The brake cannot be released and the brake is released slowly. Cause: The system pressure is too low, increase the air brake system pressure to the specified value. The brake return spring is damaged, replace the spring. The pipeline is blocked, check and clear the emergency relay valve or quick release valve. Check and replace the brake air chamber push rod. The stroke is incorrect and readjusted.
- Reasons for tire swing: loose wheel nuts, tighten them. Axle bearings are sintered or damaged, and the bearings should be replaced. The axle is bent, correct it, and replace it. The axle bearing clearance is too large, tighten the bearing locking nuts correctly, replace the bearing grease on time, and replace the axle bearings; the tire is excessively worn, and the verticality between the axle axis and the center line of the frame exceeds the standard seriously. Adjust the distance between the two ends of the axle and the traction pin as much as possible. 4. Reasons for too much resistance to the crank: poor lubrication, add lubricating grease. The bearing is damaged, and the bearing is replaced. The gear is eccentric or worn seriously, and the screw thread is damaged and replaced.
