How to Choose a Suitable Concrete Pump
2013-04-03
A concrete delivery pump has the following main technical parameters: delivery capacity, outlet pressure, motor power and distribution valve form. According to the new national standards, these main parameters can be obtained from the model of the concrete pump. The following takes Changsha Tuowo Concrete Pump "HBT60-16-110S" concrete pump as an example to illustrate its representative significance
HB-the Chinese Pinyin abbreviation of concrete pump
T-drag
S-the distribution valve is an S-shaped swing tube valve
60--Maximum conveying capacity, m3/h
16----The maximum pressure at the outlet of the concrete pump, MPa
110--Motor power, kW
According to the marked outlet pressure level, it is divided into low pressure pump (≤5MPa), medium pressure pump (6-10MPs) and high pressure pump (>10MPa); according to the maximum delivery volume per hour, there are 20-100m3 ranging from and large Most concrete pumps can realize two-stage variable displacement or stepless variable. The user should choose the outlet pressure according to the actual needs of the project and the height of the conveying distance; choose the range of the output volume according to the mixing and feeding capacity; choose the type of distribution valve according to the aggregate condition of the pumped concrete. The S-shaped swing pipe valve has less pressure loss during the pumping process, and the concrete flow path is smooth, but due to the limitation of the pipe diameter, it has higher requirements for aggregates. It is suitable for medium and high pressure pumps, and is suitable for high-rise buildings and high-quality concrete Long-distance, high-lift transportation; gate valve has been used to "eat coarse grains" because of its low requirements for aggregates. It is widely used in medium-pressure pumps. The pumping height is 100 meters and the level is within 300 meters.
Slave motor power
The motor power of a concrete pump is a prerequisite for determining the outlet pressure and delivery volume. With a certain motor power, the increase in pressure will definitely reduce the delivery volume; on the contrary, reducing the outlet pressure will make the delivery volume increase. In order to ensure that the concrete delivery pump must have a large delivery volume, but also have a certain outlet pressure and matching economic power, in the design of the concrete delivery pump, a constant power plunger pump is mostly used; that is, a constant power value After selection, when the outlet pressure increases, the output displacement of the oil pump will automatically decrease to reach the value corresponding to the power design; if you want to achieve high outlet pressure, but also want to achieve the purpose of large delivery. The only way is to increase the motor power. Therefore, in the new national standard, the concept of the capacity index of the concrete pump is cited (in MPa·m3/h); that is, the product of the actual outlet pressure of the concrete pump and the actual delivery volume per hour, the greater the value , The greater the capacity index, the greater the power of the motor, thereby achieving the purpose of large displacement and high head. When designing, our company also adopted the functional design of high and low pressure switching to meet different construction requirements. Under economic conditions, it can produce a larger delivery volume, or use the same motor power to produce a higher outlet pressure. .
