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 is proportional to the actual throughput per hour. 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. Due to low cost and adaptability, gear pump is widely used in the initial concrete pump, but due to its low pressure, high pulse resistance, it is usually used in low pressure pump or only in medium and high pressure pump Oil system; piston pump is divided into oblique and inclined axis, because of its adaptation to the pressure range, is now widely used. Such as the production of hydraulic machinery factory in Jiajiang HBTD40-6-55 low-pressure concrete pump, the main hydraulic pump on the use of Germany's Harvard V30D swash plate piston pump to high-grade components to enhance the quality of the machine . Imported hydraulic pumps, such as the A4VG, A10VG, A11VG series of products from Rexroth AG of Germany and K3V and K5V swash plate type piston pumps from Kawasaki of Japan are world-class products. Domestic oblique axis piston pump to Guiyang, represented by the source of hydraulic A7V, A8V series of products is the quality of domestic piston pump, the quality is relatively reliable. Therefore, from the use of hydraulic pump grade, you can peep a concrete pump performance of the whole machine. Hydraulic valve Hydraulic valve is the "assistant" of hydraulic pump, including sequence valve, pressure reducing valve, reversing valve, unloading valve, check valve and switching valve. Domestic valve, unloading valve to Shanghai Lixin, Beijing Huade products better, but in sequence valves, valves and other technical difficulties, high reliability requirements of the valve to the selection of Germany Hawe, Rexroth , The United States Eaton, Wei Geshi, Italy Atos (Atos), Japan Yuken and other world-renowned brands better, so that concrete pump performance can be a reliable guarantee. If a hydraulic valve group fails, it will affect the action of the whole machine; Therefore, the purchase of concrete pump, not only depends on the "heart", but also depends on its "assistant" to achieve the best configuration. Electrical components Concrete pump on the electrical components are contactors, circuit breakers, relays, etc., which operate according to logic programs to control the work of related components. Domestic electrical components although the price advantage, but the reliability and life-span and the quality of imported or joint brand components is still a gap. Such as the French Schneider contactor, Germany's Siemens circuit breakers, Japan's small Omron relay, are the best in its class. In order to reduce the number of electrical contacts and more failures, some manufacturers have PLC (programmable logic controller) applied to the concrete pump, in order to reduce the electrical system mechanical contacts to a minimum. PLC applications, to achieve a non-contact program control, but also to facilitate the realization of automated remote control, microcomputer fault detection program written to show the cause of the malfunction, to facilitate the operation and maintenance of the system. Comprehensive analysis of the brand and service Apart from the "hardware" configuration of concrete pump selection, but also the analysis of the "software" level: such as the brand's production history, research and development capabilities, service capabilities and so on. Formal large-scale enterprises in the research and development strength, quality assurance, after-sales service and spare parts supply, have a better performance, allowing users to worry about. For example, a type HB30 "Jiajiang Pump" of Seventh Engineering Bureau of Zhongshui Group, after 21 years of use, the factory can still provide enough spare parts is a typical example. In summary, the purchase of concrete pump, not only to choose the brand, the election performance, the level of election components, but also depends on the research and development of manufacturing enterprises, production history, but also depends on the level of after-sales service and product cost. Metal Spinning Copper Products Metal Spinning Copper Products,Copper Sheet Metal Lids,Tibetan Singing Bowl Set,Copper Fabrication Spun Base Shaoxing Hui Da Metal Products Factory , https://www.syhdmetal.com