How to solve the problem of excessive hydraulic oil temperature in the boom concrete pump truck system?

meter double bridge pump truck (1)

Common faults of boom concrete pump truck and maintenance of boom concrete pump truck. The application of boom concrete pump trucks is not uncommon in civil engineering, high-rise building engineering, water conservancy engineering, large-scale foundation engineering, bridge engineering, subway engineering, hydropower engineering and other projects.

boom concrete pump truck is a special concrete conveying machine with strong mobility. Usually, concrete pumps are installed on special vehicles or car chassis. It has the advantages of high pouring quality, fast construction speed, labor saving, etc. It is an indispensable boom concrete pump truck in engineering projects. In practice, the boom-type concrete pump truck has more or less failures due to difficult operation and complex structure.

The temperature of the hydraulic oil in the pumping system is too high:
Boom-type concrete pump trucks are often accompanied by pressure shocks during reversing during continuous operation, and the pumping system often reverses. The main oil circuit of the pumping hydraulic system is a closed circuit, usually in a large flow or high pressure state. It consists of two main hydraulic cylinders connected in series and a bidirectional variable axial piston pump. Once the pumping system fails, the oil temperature of the boom concrete pump truck will inevitably be too high. The main reason for high oil temperature is improper component adjustment, maintenance and operation, or problems in manufacturing and design. Specifically, there may be the following reasons:

Boom concrete pump truck

1. The internal leakage of the hydraulic system is too serious;

2. The safety valve is not unloaded or the set pressure is too high;

3. Poor heat dissipation of the heat sink and excessive dust accumulation;

4. The cooler fan stops;

5. The cooler is blocked;

6. ​​The set pressure of the low pressure relief valve is too high or damaged;

7. The hydraulic system of the boom is not unloaded;

8. The amount of hydraulic oil itself is insufficient. When the oil temperature rises too fast, or the hydraulic oil temperature is 30 ~ 80 higher than the normal operating temperature, it is necessary to find and compare the cause of the fault in time based on experience in order to take corresponding repair measures.

The principle of    boom concrete pump truck is as follows: it is modified on the chassis of a truck. It is equipped with motion and power transmission devices, pumping and mixing devices, distributing devices and other auxiliary devices on the chassis. The power of the boom concrete pump truck transmits the power of the engine to the hydraulic pump unit or the rear axle through the power transfer box, and the hydraulic pump pushes the piston to drive the concrete pump to work. Then use the placing boom and delivery pipe on the pump truck to transport the concrete to the highest height and distance. High pressure is used when the concrete of the pump truck is relatively poor or the output height is relatively high. The characteristic is that the stroke of the main cylinder is short and the pressure is large, so the speed of the material is relatively slow. Usually the working place is relatively flat, and low pressure is used, and the low pressure speed is fast and fuel-efficient. Low pressure and large displacement, high pressure and small displacement.

Post time: Nov-23-2020