Vacuum mixer for ultra-high performance concrete

Abstract

The invention relates to the technical field of concrete mixers. A vacuum mixer for ultra-high performance concrete comprises a stirring barrel, a stirring assembly, a vacuumizing assembly and a feeding assembly. A cover body is arranged at the top of the stirring barrel. The stirring assembly is arranged in the stirring barrel and used for stirring and mixing a mixture, and a sealing unit is arranged between the stirring assembly and the stirring barrel. The vacuumizing assembly is connected with the stirring barrel and is used for vacuumizing the interior of the stirring barrel. The feedingassembly is connected with the stirring barrel through a conveying pipeline, and a sealing valve is arranged on the conveying pipeline. The vacuum mixer is reasonable in structural design, the constant vacuum degree in the stirring barrel can be guaranteed, the quality of the stirred mixture is improved, the product structure is optimized, the service life is prolonged, and the use convenience isimproved.

Description

technical field [0001] The invention relates to the technical field of concrete mixers, in particular to a vacuum mixer for ultra-high performance concrete. Background technique [0002] Ultra-High Performance Concrete (UHPC for short) is a new development of modern concrete technology, which is jointly promoted by good particle accumulation, suitable mixing procedure, scientific maintenance system and appropriate amount of cement and admixture. UHPC has attracted more and more attention because of its excellent performance, and its application range has become wider and wider. Using UHPC as the outer protective panel of buildings can not only reduce the impact damage caused by external forces such as aircraft on important facilities such as nuclear power plants, high-rise buildings and power plants, but also obtain ideal aesthetic effects; high fluid self-compacting performance makes it more suitable for Structure with complex formwork and high reinforcement ratio; excelle...

AI Technical Summary

Problems solved by technology

But this application is only for the forced concrete vacuum mixer, and its structural feature is that the motor is placed outside the mixing drum, and the rotating shaft connected with the motor must pass through the mixing drum, and it is difficult to ensure the airtightness of the mixing drum at the connection between the rotating shaft and the mixing drum sex and vacuum

At the same time, the feeding and mixing procedure of this application will also affect the performance of concrete, and it is not suitable for mixing UHPC mixture

In view of the problems existing in this application, another Chinese patent (CN201721108634.4) tries to solve them. This application proposes a conical reverse discharge concrete vacuum mixer, which is characterized in that the motor drives the mixing drum to rotate during the mixing process, but Due to the rotation of the mixing drum, vacuuming must be completed before stirring, but the vacuum degree in the mixing drum will be lost during the process of adding water and stirring. Since the vacuum cannot be continuously pumped, the effect of eliminating air bubbles in the mixture is limited, especially The lack of forced blades to puncture air bubbles and the relatively low rotational speed of the mixing drum determine that this mixer is not suitable for mixing UHPC mixtures with higher viscosity, especially those mixed with fibers.

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