How to solve the problem of concrete pump cutoff
Since the concrete pump now uses a two-cylinder driven helium pump, although there is an advantage, there will be a flow interruption phenomenon. The solution to the interruption of the flow of the concrete pump during the pumping process is to shorten the commutation time as much as possible and to accelerate the running speed of the main cylinder piston at the beginning of the commutation. Let's take a look at the solution.
For most pumping systems, the current cut-off problem can be solved by using a proportionally controlled constant power piston pump. Since the electric proportional control + constant power control is that the electronic control variable takes precedence over the constant power control, the displacement is controlled by the control current when the power is hyperbolic, and before the commutation process and the reversing cylinder piston pushes the enthalpy in the pipeline The system pressure is usually lower than the pumping pressure. It is possible to increase the displacement of the main oil pump to realize the quick reversal of the distribution valve, reduce the time after the commutation and start to push the sputum, and realize the turbulent flow from the apparent.
In the use of concrete pumps, it is possible to improve the pumpability of concrete by adding additives without increasing the amount of cement, which can reduce production costs. Let's take a look at what the added additives do.
There are many kinds of additives, and the admixtures which can improve the pumpability of concrete include an air entraining agent, a water reducing agent, a retarder and a pumping agent.
The water reducing agent can change the agglomerated structure of the cement slurry to a dispersed structure, thereby improving the fluidity. If the fluidity of the fresh concrete is kept constant, the use of water reducing agent can greatly reduce the amount of water used for mixing, thereby improving the stability of the concrete and improving the strength and compactness. If the strength of the concrete is kept constant, the amount of cement can be saved. Commonly used water reducing agents are lignin sulfonate and naphthalene sulfonate formaldehyde condensate, such as calcium lignosulfonate, NNO, Jianyi, MF, FDN and so on.
The air entraining agent can make the concrete produce many fine bubbles, improve the cohesiveness and water retention of the concrete, improve the fluidity, and improve the frost resistance and impermeability of the concrete, but affect the strength of the concrete. Commonly used air entraining agents are rosin soap, sodium alkyl sulfonate, sodium sulphate, and aluminum powder air entraining agent. Retarders can delay the setting and hardening of concrete, and sometimes can also be used as a water reducing agent.
The role of the retarder is to extend the transport time of the concrete, and it is important to pump it during the hot season. Commonly used retarders are molasses, calcium lignosulfonate, tartaric acid, citric acid, boric acid, and the like. The pumping agent is a kind of lubricant. Like other admixtures, it is possible to significantly increase the fluidity without changing the mix ratio of the concrete, which is to expand the proportioning design range of the concrete.
We Saner Heavy Industry(SEZG)was founded in 2010,We specialize in producing various concrete pump equipment, including tunnel installation machinery, energy mining machinery, environmental engineering machinery, and research and development manufacturing solutions for underground engineering machinery. For more information, click on the link below：
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