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众所周知,带有 S 形管阀的混凝土泵由料斗、活塞缸以及 S 形管阀组成。阀管的一端绕输送管道摆动,另一端与二个活塞缸交替相通。这种传统的混凝土泵有如下缺点:通常摆动管的位置是瞬时转换,要使活塞缸内充满混凝土,就应使摆管快速摆动。但是,如果料斗中的混凝土是低塌落度混凝土,就不可能迅速进入快速摆动的摆管中。这样在活塞缸的孔口周围就会形成一个真空区,结果会使活塞缸与摆管中混凝土的输送发生中断及易使液态混凝土分离成水泥砂浆和骨料,而且在活塞缸的缸口上面会产生混凝土结拱现象。这种成拱的混凝土就不能进入缸内。此外,混凝土在料斗内还会形成空气通道,
As we all know, concrete pump with S-shaped pipe valve consists of hopper, piston cylinder and S-shaped pipe valve. One end of the valve tube swings around the delivery pipe, and the other end alternately communicates with two piston cylinders. This conventional concrete pump has the following disadvantages: Usually the position of the swinging pipe is instantaneously switched. To make the piston cylinder filled with concrete, the pendulum pipe should be swung quickly. However, if the concrete in the hopper is low slump concrete, it is not possible to quickly enter the rapidly swinging pendulum tube. In this way, a vacuum zone is formed around the orifice of the piston cylinder. As a result, the conveying of the concrete in the piston cylinder and the oscillating tube is interrupted and the liquid concrete is easily separated into cement mortar and aggregate, and above the cylinder port of the piston cylinder. Concrete will result in arching. This arched concrete cannot enter the tank. In addition, concrete will form air passages inside the hoppers.