Introduction

Dump trucks are often combined with construction machinery such as excavators , loaders , and belt conveyors in civil engineering to form a loading, transportation, and unloading production line for loading and unloading of earthwork, sand, and bulk materials.

Working Principle

The structure of the engine, chassis and cab of a dump truck is the same as that of a general truck.

Here is the working principle of impact crusher.The toothed counter-back plate rebounds and fallsfreely after the material reaches the top of the vortex breaking chamber and then hits and crushesconstantly with subsequently upward impacting materials.

The high-pressure oil enters the lifting hydraulic cylinder through the distribution valve and the oil pipe, and there is a cab safety protection plate at the front end of the carriage.

The engine drives the hydraulic pump through the transmission and the power take-off device, and the high-pressure oil enters the lifting hydraulic cylinder through the distribution valve and the oil pipe, and pushes the piston rod to overturn the carriage. Lateral tipping is more common, and the movement of the piston rod is controlled by the steering system to stop the carriage in any desired tilted position. The carriage is reset using its own gravity and hydraulic control .

Advantage

Since the loading carriage can automatically tip over a certain angle for unloading, it greatly saves unloading time and labor, shortens the transportation cycle, improves production efficiency, and reduces transportation costs. It is a commonly used special-purpose vehicle for transportation .

Maintenance Tips

1. New dump trucks or overhauled trucks must be tested to make the lifting process of the carriage smooth and free of movement.

2. The lubricating oil should be correctly selected for each part in use, which greatly saves the unloading time and labor, and the lifting mechanism should exchange the oil strictly on schedule.

3. Ship according to the rated load, and overload is strictly prohibited.

Operating Procedures

1Do not suddenly push the lifting handle to the "lowering position" in the middle of full-load lifting.

If such an operation error occurs, the carriage will suddenly rush down, which will bring a great impact to the frame, and even cause an accident. Therefore, the above-mentioned operations should be avoided as much as possible. If there are special circumstances, it must be operated carefully, the descent speed should be slowed down as much as possible, and the carriage must not be suddenly dropped to the bottom.

2It is not allowed to use the slam-lift truck - slam the brakes to unload the goods.

Due to the large inertial force (usually 5~20 times of the rated lifting force), it is very easy to cause permanent deformation of the frame, welding of the carriage and the auxiliary frame, burning of the oil pump, damage to the sealing ring, damage to the hydraulic cylinder, etc. , the service life of the vehicle is reduced, and in severe cases, a rollover accident will occur. Therefore, it is generally forbidden to drive the dump truck when it is lifted.

3After the dump truck unloads the goods, the power take- off must be disconnected before driving.

If this operation error occurs, when the dump truck is driving, since the power take-off is in the "engaged" position, the lift oil pump will run at high speed for a long time without load in the "small cycle" state. As a result, the temperature of the hydraulic oil rises rapidly, which is easy to cause damage to the oil seal of the oil pump, and even the phenomenon of "burning out" of the oil pump; more seriously, the operation of the oil pump means that the hydraulic system has a power source, and it is easy to cause the carriage to automatically rise during the driving process. accident.

4The power take-off cannot be in the "on" position when driving.

If it is in the "on" state (the red light is on), the oil pump will continue to rotate, and the hydraulic system will have a power source, which will cause the carriage to automatically lift due to misoperation on the air control valve; Even if the control distribution valve is in the "down" position, the oil will enter the oil pump, which will cause the oil pump to burn out.