How to choose a good concrete pump?

In recent years, the state has increased investment in basic infrastructure construction. Concrete pump market has also developed rapidly. Concrete pump has played an important role in the construction market. Domestic hydraulic double-cylinder concrete pump has experienced a development process from scratch, from weak to strong. With the market warming, concrete pump production enterprises continue to emerge, different manufacturers, models of concrete pump products more and more. "Gongyushanjishi, we must first of its profits", the face of another dazzling concrete pump product market, the user how to identify its performance? From where the cut, in order to purchase quality and cheap, high performance concrete pump? This is discussed below. From the technical parameters. 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 several parameters from the concrete pump model can be informed. The following to "HBTS60-13-90" type concrete pump as an example to illustrate its representative significance. HB ?? concrete pump Pinyin abbreviation T ?? drag concrete pump S ?? distribution valve for the S-shaped swing valve (D said butterfly valve, Z said the valve) 60 ?? maximum theoretical throughput, m3 / H13 ?? The maximum pressure at the outlet of concrete pump, MPa90 ?? Motor power, kW in accordance with the marked outlet pressure level, divided into low-pressure pump (≤ 5MPa), medium pressure pump (6-10MPs) and high-pressure pump ); According to the maximum throughput per hour, there are 20-100m3 range, and most of the concrete pump can be achieved two variable or variable stepless variable. The user should select the outlet pressure according to the actual needs of the engineering project according to the height of the conveying distance. According to the capacity of the mixing material, select the range of the outputting quantity; select the form of the distributing valve according to the aggregate situation of pumping concrete. Butterfly valve on the aggregate of the best adaptability, but the swing of the larger cross-sectional area, suitable for low and medium pressure level of concrete pump for basic infrastructure; S-shaped valve in the pumping process Low pressure loss, smooth flow of concrete, but limited by the diameter of the aggregate demanding, suitable for medium and high pressure pumps, high-rise buildings and concrete for high quality long-distance, high-lift delivery; Between the butterfly valve and the S valve between the application of more in the medium-pressure pump. A concrete pump motor power is to determine the outlet pressure and the amount of the transport of the prerequisite for a certain power in the case of the motor, the pressure will increase the amount of transport to reduce; the contrary, reducing the export pressure, will make the delivery volume increase. In order to ensure that the concrete pump should not only have a larger transmission capacity, but also have a certain outlet pressure and the economic power to match in the concrete pump design, most of the constant power piston pump; constant power value When selected, when the outlet pressure increases, the pump output displacement will automatically reduce to reach the value corresponding to the power design; if both to achieve high export pressure, but also want to get a large amount of transportation purposes. The only way is to increase the motor power. Therefore, in the new national standards, the concept of the ability of concrete pump index (in MPa? M3 / h for the measurement unit); that is, the actual delivery of concrete pump pressure per hour and the actual throughput of the product, the value of the more Large, the greater the ability index, the motor power will be greater, thus achieving large displacement, high-lift purposes. Many manufacturers in the design, but also the use of high and low voltage switching function design to meet the different requirements of the construction, in the economic state, but also produce a larger delivery volume, or the same motor power, resulting in higher outlet pressure . Still HBTS60-13-90, for example, when its maximum throughput 63m / 3h, the outlet pressure of 7.7MPa, can achieve low-pressure large-capacity rapid pumping, when the transfer volume of 37m3 / h, the largest export Pressure up to 13MPa, can achieve high-pressure low-displacement high-lift, long-distance transport. To the concrete pump outlet pressure to high pressure level, while a large amount of delivery, in the case of insufficient motor power, which is impossible to achieve at the same time. According to the structure of the hydraulic pump pump gear, vane pump, piston pump, pump pump, piston pump, pump, pump, pump, pump, pump, . For the same type of hydraulic pump suitable for different pressure levels. Gear pump because of low cost, strong adaptability, in the early concrete pump is widely used, but its smaller pressure, pulse resistance, usually configured on low-pressure pump, or only in the high-pressure pump auxiliary Oil system; plunger pump sub-swashplate and oblique axis, because of its adaptation to the pressure range, is currently widely used. Such as the Jiajiang Hydraulic Machinery Plant HBTD40-6-55 production of low-pressure concrete pump, the main hydraulic pump on the use of the German Harvard's V30D swashplate piston pump to high-grade component configuration to enhance the quality of the machine . Imports of hydraulic pumps, such as Germany's Rexroth's A4VG, A10VG, A11VG series of products and Japan's Kawasaki's K3V, K5V swashplate piston pump, are world-class products. Domestic oblique axis piston pump, Guiyang Guiyang Liyuan hydraulic representative of the 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 peek a concrete pump performance of the whole machine. Hydraulic valve Hydraulic valve is the hydraulic pump "assistant", including the order valve, pressure reducing valve, reversing valve, unloading valve, check valve and switching valve. But in order valve, pressure relief valve and other technical difficulties, high reliability requirements of the valve class, to use Germany Harvey, Germany, Germany, Germany, Germany, the United States, Rexroth, the United States Eaton, Wei Ge Shi, Italy Atos (Atos), the Japanese oil research, and other world-renowned brands better, so that concrete pump performance can be a reliable protection. If the failure of a hydraulic valve, it will affect the movement of the whole; so buy concrete pump, not only depends on the "heart", but also to see the "assistant" to achieve the best configuration. Electrical components The electrical components on the concrete pump are contactors, circuit breakers, relays, etc., which operate in a logical sequence to control the operation of the associated components. Domestic electrical components in the price advantage, but the reliability and longevity of imported or joint venture brand component quality is still a gap. Such as the French Schneider contactors, Germany's Siemens circuit breaker, Japan Omron's small relays, are similar products in the crowd. In order to reduce the electrical contacts to bring more failures, some manufacturers have the PLC (Programmable Logic Controller) applied to the concrete pump, so that its electrical system to minimize the mechanical contact. PLC applications, to achieve a non-contact program control, but also facilitate the realization of automated remote control, with micro-computer programming fault detection procedures, show the cause of the malfunction, to facilitate the operation and maintenance of the system. Comprehensive analysis and analysis of brand and service In addition to the concrete pump from the "hardware" configuration options, but also analysis and analysis of its "software" level: such as the brand's production history, research and development capabilities, after-sales service capabilities and so on. Formal large enterprises in research and development strength, quality assurance, after-sales service and supply of spare parts supply, have a better performance, allows users to remove worries. For example, HBT60-13-90SD, purchased from Heajee in the Seventh Engineering Engineering Bureau of Zhongshui Group, has been able to provide enough spare parts after 21 years of operation, which is a typical example. In summary, the purchase of concrete pump, not only to choose the brand, select performance, select the component grade, but also depends on the R & D strength of manufacturing enterprises, production history, but also to see the level of after-sales service and product cost.