In recent years, the state has increased investment in infrastructure construction. Concrete machinery market has also been rapid development, including concrete pump in the increasingly booming construction market plays an important role in the domestic full-hydraulic two-cylinder concrete pump has experienced from scratch, from weak to strong development. With the market warming, concrete pump manufacturers continue to emerge, different manufacturers, models of concrete pump products more and more. "Workers want things good, we must first sharpen his" in the face of dazzling concrete pump market, how users should identify their performance? From which aspects to cut in order to buy quality and cheap, high performance concrete pump? The following discussion. From the technical parameters to start. Usually, a concrete pump has the following main technical parameters: delivery displacement, outlet pressure, motor power and distribution valve form. In accordance with the new national standards, these main parameters from the concrete pump models can be known. Here to "HBTS60-13-90" type concrete pump as an example to illustrate its significance. HB - Chinese Pinyin abbreviation for concrete pump T - Drag-type concrete pump S - Distribution valve is S-shaped tube valve (D for butterfly valve, Z for gate valve) 60 - The maximum theoretical delivery, m3 / h 13 - maximum pressure at the concrete pump outlet, MPa 90 - motor power, kW According to the marked outlet pressure level, divided into low pressure pump (≤ 5MPa), medium pressure pump (6-10MPs) and high pressure pump > 10MPa); According to the maximum throughput per hour, there are 20-100m3 range, and most concrete pump can achieve two variable displacement or variable. The user should select the outlet pressure according to the actual needs of the project according to the height of the conveying distance. Select the range of the output side volume according to the ability of mixing feeding. Select the form of distribution valve according to the aggregates of pumping concrete. Butterfly valve to the best adaptability of the aggregate, but the commutation swing larger cross-sectional area, suitable for low, medium pressure level of concrete pump, suitable for infrastructure; S-shaped tube valve during the pump pressure Less loss, smooth flow of concrete, but by the diameter restrictions, the higher the aggregate, suitable for medium and high pressure pump for high-rise buildings and concrete high quality long-distance, high-lift delivery; Between the butterfly valve and the S valve, the application in the medium pressure pump more. The motor power of a concrete pump is a prerequisite for determining the outlet pressure and delivery volume. When the motor power is constant, the increase of pressure will reduce the delivery volume. On the contrary, reducing the outlet pressure will make the delivery volume increase. In order to ensure that the concrete pump has both a larger delivery capacity, but also have a certain outlet pressure and the corresponding economic power in the design of concrete pump, most of the constant power piston pump; the constant power value Selected, when the outlet pressure increases, the pump output displacement will be automatically reduced to reach the value corresponding to the power design; if it is necessary to achieve high outlet pressure, but also want to get a large amount of delivery purposes. The only way is to increase the motor power. Therefore, in the new national standard, the concept of capacity index of concrete pump is quoted (measured in MPa? M3 / h); that is, the actual output pressure of concrete pump and the actual output per hour, the more the value Large, the greater its ability index, the greater the power of the motor, thus achieving the purpose of large displacement, high lift. Many manufacturers in the design, also used high and low voltage switching function design to meet different construction requirements, in economic conditions, but also have a larger delivery capacity, or with the same motor power, resulting in a higher outlet pressure . Still taking HBTS60-13-90 as an example, when it is at the maximum delivery volume of 63m / 3h, the outlet pressure is 7.7MPa, which can realize the rapid pumping with large displacement at low pressure. When switching to the delivery volume of 37m3 / h, the maximum outlet Pressure reached 13MPa, high-pressure small displacement can achieve high-lift, long-distance transport. If the outlet pressure of the concrete pump reaches a high pressure level and at the same time has a great throughput, this can not be achieved at the same time if the motor power is insufficient. See concrete pump components configuration Hydraulic pump Hydraulic pump is the "heart" of concrete pump, according to the origin of different domestic hydraulic pump and imported hydraulic pump points; according to the structure of the hydraulic pump gear pump, vane pump, piston pump The points. For the same type of hydraulic pump suitable for different pressure levels.