Introduction to Continuous Concrete Mixer

The wide application of continuous concrete mixers has brought good social and economic benefits. This article will give you a detailed introduction to a continuous concrete mixer.

Here is the outline of this article.

Classification of Concrete Mixers

In order to adapt to different concrete mixing requirements, there are various types of mixers, each of which has its own characteristics in terms of structure and performance. The mixers are classified as follows.

According to the mode of operation, concrete mixers are divided into batch and continuous. A batch concrete mixer is a machine that mixes concrete in a cyclic manner in the order of feeding, mixing, and discharging; a continuous concrete mixer is a mixer that can continuously and evenly mix and discharge. The process of loading, mixing, and discharging of batch concrete mixers is done periodically in batches. It is a simple structure, easy to control the mix ratio and mix quality, and is a common type in construction.

Continuous concrete mixers are continuous in the process of loading, mixing, and discharging. Therefore, it has high productivity, but the concrete mix ratio and mixing quality are difficult to control. It is seldom used in common building construction but is mostly used in road, bridge, and dam projects where large quantities of concrete are needed.

The Development History of Concrete Mixer

Free-fall concrete mixers can be traced back to the early 20th century when steam-driven drum concrete mixers began to appear. In the next fifty years, reversing and tipping drum concrete mixers were introduced and developed.

Since the free-fall concrete mixer is mainly to mix plastic concrete, so the compulsory concrete mixer began to rise. From the early 1950s after the rise of the compulsory concrete mixer has been rapid development and promotion. The first to appear is the disc vertical shaft type compulsory concrete mixer. This mixer is divided into turbo concrete mixers and planetary concrete mixers.

After the 70s, with the application of light aggregates, the horizontal shaft mixer appeared. It is also divided into single horizontal shaft type and double horizontal shaft type and has the characteristics of both free-fall concrete mixer and compulsory concrete mixer. It started to appear in the United States and Germany in the late 1940s, but its development was basically at a standstill due to the immaturity of the shaft-end sealing technology. Until the early 1970s, due to this technological breakthrough, double horizontal shaft mixers in many countries y redeveloped. At present, a series of products have been formed.

Then the continuous concrete mixer appeared. Its working principle is that: it is equipped with spiral mixing blades. Various materials are weighed and fed into the mixer according to the ratio, and the mixed concrete is continuously discharged outward from the discharge end. A continuous concrete mixer has the advantage of short mixing time and high productivity.

With the development of concrete materials and construction technology, there are many new structures of concrete mixers, such as steam-heated mixers, supercritical speed mixers, sonic mixers, no mixing blades of the swinging disc mixer, and secondary mixing concrete mixers.

The Importance of Continuous Concrete Mixers

At present, the concrete mixers used on construction sites are of different shapes and sizes, but the mixers are of a single cylinder structure. In the operation of a single cylinder mixer, the feeding and discharging make the mixing interrupted. Feeding, mixing, discharging, and re-feeding form an intermittent operation, seriously affecting the efficiency.

Furthermore, the capacity of the single cylinder mixer is limited, which often makes the concrete pouring a long pause, causing a certain impact on the quality of the project. In large construction projects, road projects, and bridge projects, due to a large amount of concrete, and concrete pouring quality requirements, it is difficult to meet the construction requirements for a single cylinder mixer. Therefore, the design and manufacture of a continuous concrete mixer that can operate continuously and mix concrete evenly will be very necessary.

Structure of Continuous Concrete Mixer

Continuous Concrete Mixer
Continuous Concrete Mixer

1. Mixer

2. Feeding port

3. Discharge port

4. Mixing blade

5. Support frame

6. Rolling support

7. Water sprinkler

8. Central mixing cylinder

9. Secondary outer mixing cylinder

10. Outer mixing cylinder

11. Peephole

Features of Continuous Concrete Mixer

The continuous concrete mixer has features of reasonable structure, novelty, and easy production. It is convenient to feed and discharge during operation. The concrete material is uniform and can be suitable for any requirement of concrete mixing. No concrete material is deposited in the mixer, and the mixing cylinder is easy to clean. In the unit time, the mixing capacity is greatly increased than the single cylinder mixer, and the work efficiency is improved exponentially. It is a kind of replacement product for a concrete mixer. It has significant economic and social benefits.

The Significance of Concrete Mixer

A concrete mixer is a special machine for preparing concrete by mixing concrete materials: cement, sand, gravel (aggregate) and water, etc., in a certain ratio.

It is generally believed that the main role of the concrete mixer is: to make the filler evenly distributed so that it is fully mixed; destroy the cement “dough” phenomenon and make the cement in the aggregate surface fully wrapped, ready for full mixing; keep mixing to promote the full combination of cement particles and its coarse and fine aggregates to form the ideal cement mixture. Once the water is too much wrapped in coarse and fine aggregates, it is not conducive to the adhesion of cement powder. The mixing of the mixer can split the attachment influence of the water film, so as to achieve the purpose of homogenization of the cement mixture.

After reading this article, I believe you have a preliminary understanding of the continuous concrete mixer. If there is anything unclear, you can leave a message and let me know, and I will answer your questions as best I can.

Also to read:

How to Calibrate Concrete Mixers

How to Operate Concrete Batching Plant

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