Structural characteristics of hydraulic transmission concrete pump

Concrete pump, is the use of pressure concrete along the pipeline for continuous delivery of machinery. Consists of pump body and delivery pipe. According to the structure is divided into piston type, squeeze type, hydraulic diaphragm type. Pump body mounted on the chassis of the car, and then equipped with telescopic or inflatable fabric rod, to form a pump. Hydraulic transmission concrete pump consists of hopper, hydraulic cylinder and piston, concrete cylinder, distribution valve, Y-shaped pipe, flushing equipment, hydraulic system and power system. The hydraulic system pushes the piston back and forth by pressure. When the piston moves backward, the concrete will be pressed into the conveying pipe through the Y-shaped pipe before pushing. After the pump concrete is over, clean the pump body and delivery pipe with high-pressure water or compressed air. Piston concrete pump displacement, depending on the number and diameter of concrete tanks, piston reciprocating speed and volume of concrete cylinder suction efficiency. Hydraulic pump concrete pump system consists of hydraulic pumps, hydraulic motors, hydraulic cylinders, accumulators, filters, coolers, valves, pressure gauges, tubing and fuel tanks and other components, generally divided into four subsystems: the main pump hydraulic system, Boom leg and turntable hydraulic system, pump truck mixing and cooling hydraulic system and washing hydraulic system. In order to reduce the weight of the hydraulic components such as the hydraulic cylinder on the fabric rod, the cloth rod and the leg circuit adopt a higher rated pressure. The hydraulic system of pump truck varies with different models, but its basic working principle is the same. In concrete pump hydraulic system, due to performance requirements, the system often has safety valves, relief valves and sequence valves. If the safety valve pressure is too low, the safety valve will be frequently opened, resulting in overflow loss, resulting in system fever; if the pressure is too high, it will increase the system leakage, the system fever, therefore, should be hydraulic system Load requirements, correct calculation and adjustment of safety valves and pressure values ​​to ensure that the system operates within the specified pressure range. When the main pump pump system for the closed loop system, the pump system must be located in the heat exchange circuit, the heat exchanger circuit relief valve set pressure should pay attention to setting the pressure is too low, will pump Hydraulic cylinder to increase the impact, set the pressure is too high, will make the overflow loss is too large, the system temperature is too high. If the internal control sequence valve to adjust the pressure is too high, when the working pressure of the hydraulic cylinder is lower than the adjustment pressure, there is pressure loss of the sequence valve port, causing temperature rise, resulting in system fever, a reasonable set of internal control sequence valve settings Pressure, the working pressure of the working cylinder is higher than the opening pressure of the sequence valve. When the sequence valve is in operation, the valve port will be fully open and the valve port will be substantially pressure-free, thereby avoiding the system heat caused by the improper setting of the sequence valve .