A Brief Introduction To Forced Concrete Mixers

Forced concrete mixers are mechanical equipment that uses forced stirring of mixing blades to quickly and evenly mix raw materials such as cement, sand, and water into concrete. It has the characteristics of high mixing efficiency, good mixing quality, and a wide range of applications. Forced action concrete mixer is especially suitable for mixing dry hard concrete, high-strength concrete, and lightweight aggregate concrete. It is widely used in construction engineering, road construction, bridge construction, and other fields.

Working principle of forced concrete mixers:
The working principle of forced concrete mixers is mainly based on the "forced mixing" mechanism, which forces the raw materials to perform complex movements in the mixing drum through mechanical force to achieve uniform mixing. Its core working process is as follows:
1. Structural composition and working basis
- Mixing system: It consists of a mixing drum, mixing blades, a rotating shaft, etc. The mixing drum is mostly horizontally placed cylindrical or vertically placed disc-shaped, and the mixing blades are fixed on the rotating shaft at a certain angle and layout.
- Power system: Power is provided by motors, reducers, etc. to drive the mixing shaft to rotate.
- Feeding and unloading devices: used for the input of raw materials and the output of finished concrete.

2. Specific work flow
- Raw material input: Cement, sand, water and additives are fed into the mixing drum through the feed port according to the proportion.
- Forced mixing process:
The mixing shaft drives the blades to rotate at high speed, and the blades exert shear, extrusion, flipping and throwing forces on the raw materials.
Under the push of the blades, the raw materials move axially along the axis of the mixing drum on the one hand, and move in a circular motion under the action of centrifugal force and friction on the other hand, forming a complex cross flow (such as "convection motion" and "shear motion").
This movement causes materials of different particle sizes and densities to intersperse, collide and rub against each other, breaking the particle aggregation state of the raw materials and achieving uniform mixing.
- Finished product unloading: After mixing is completed, the concrete is discharged through the unloading device (such as unloading door, tilting mixing drum).

Common types of forced action concrete mixer:
- Vertical shaft forced concrete mixer: The mixing drum is placed vertically and the blades rotate on the horizontal plane. It is suitable for mixing dry hard concrete and has a fast mixing speed.
- Horizontal shaft forced concrete mixer: The mixing drum is placed horizontally, and the double-shaft or single-shaft blades rotate. The mixing range is large and it is often used in large-scale projects.

Forced concrete mixers efficiently solve the problem of concrete mixing uniformity through mechanical forced mixing. They have irreplaceable advantages, especially in the preparation of high-strength, dry and hard concrete. They are one of the key construction equipment in modern engineering construction.