Starting a construction site, anyone at least once had a question: how to make a manual concrete mixer with your own hands? It is quite a tedious task to mix the solution in a bucket.
And if you need to make a floor screed, you will hardly be able to do this with your hands: the viscous solution will quickly set before you have time to mix it to the desired homogeneity.
It is expensive to purchase a factory concrete mixer, since this technique is not cheap. And renting it will cost you a lot. Homemade concrete mixers with a manual drive are specific devices, but for small construction work, including the complete filling of the foundation of the house, they are quite enough.
The time spent will quickly pay off by speeding up mixing and increasing the quality of work.
Each of you at least once in your life has seen how concrete solution is mixed in a bucket using a drill with a mixer attachment. And it looked so simple. But, firstly, the drill mechanism is not designed for long work and in this mode will not last long.
And this is not the main problem .
When mixing the solution in this way, the tool will need to be driven in a circle. Therefore, during construction, mechanical forced mixing in a non-moving barrel is not used, since the mechanism for moving the mixer is complex, expensive and unreliable.
Let's consider how a construction concrete mixer works.
As a rule, four methods of mixing cement-sand mortar are used:
With this mixing, the bucket with the components of the solution gradually rolls over, the solution begins to flop on itself and mix.
But you can't get a large volume like that, the quality of the finished solution is satisfactory, and this method is not used in industry.
For personal use, you can quickly and easily make a good gravity concrete mixer.
Also, with this mixing, the container remains stationary, and the mixer creates compression waves in the concrete mixture, which mix well and compact the solution. The disadvantage of this method is increased energy consumption: a mixer drive of 1.3 kW is needed for 20 liters of solution.
This pure kneading is usually not used.
As a rule, mechanical mixing is combined with gravity: a mixer rotates in an inclined barrel, or the barrel itself rotates with protrusions inside. You can make such a concrete mixer yourself.
In a gravity concrete mixer, you can knead dry mortar on the screed: a special axle pipe will cut the concrete solution when transferring, so that a certain forced mixing takes place in this machine.
The disadvantage of this mixer is one: it is difficult to rotate, and the batch lasts about 15 minutes.depending on the viscosity of the concrete solution.
But the efficiency compared to a bucket and a shovel is three times higher, and the quality of the concrete mix for self-construction is excellent.
Concrete mixers of this type allow you to quickly and with good quality pour the foundation for a garden house. If you are planning a more capital construction, then you will need a forced concrete mixer. You can also make them yourself.
Consider the individual units of the concrete mixer:
In the corners, the solution does not mix properly, and for a better quality solution, you need to rotate for a very long time, consuming electricity. For small batches of solution, a good bucket is obtained from two identical basins. If the agitator is to be used occasionally, you can also take plastic cans, fastened along the rim with a metal tape. One of the cans needs to cut the bottom. This bucket will only be tiltable: side discharge is not possible.
The neck of this top-discharge bucket must be reinforced with two cross bars.
How it looks when assembled: the axle, with a rotating flywheel and the tub, the main end is included into a ball bearing clutch located inside the hub.
This is the first option; in the second version, you need to weld the hub to the flywheel, and bolt to the hub behind the bottom of the bucket.
In this case, the bearing clutch will be attached to the flywheel, and another clutch will be needed to reinforce the bucket neck. On the bearing of the coupling, if the bucket is inclined with the top unloading, concrete solution will always get into it, therefore this solution will be suitable for a horizontal bucket with a blind bottom.
For an inclined bucket it is better to choose a straight reducer; and for horizontal - angular. The approximate rotation speed of the bucket is 40 rpm. With an increase in speed, the concrete solution will start to spray, and with a decrease, it will not mix well.
For the required speed, the gear train is supplemented by a belt if necessary. For an inclined bucket, the motor power is 20 W / L, 15 W / L for a horizontal rotating bucket and 12 W / L for a stationary bucket and a mixer that rotates on an axis.
In hand-operated concrete mixers, especially with a bucket from a barrel, the mixer should be welded to the axle, because.the load on the vessel will not benefit him.
The advantage of a simple concrete mixer with a forced mixing mechanism is the larger volume . The drive does not have to be electric, it can be manual. Unloading, usually lateral .
The main disadvantage is the impossibility of mixing in the corners. The second minus is the spraying of the solution at increased speed (35 / min). The duration of mixing the solution is 5 minutes; dry 12 min.
This stirrer can be manual or electric.
There are two advantages: high homogeneity and quality of the concrete mix, as well as the speed of mixing. This do-it-yourself concrete mixer gives high quality concrete that is not inferior to any industrial mixtures, and the mixing speed is determined by the number of revolutions: 4 turns are enough for the solution to be ready.
Minus one: the complexity of the mechanism. Even a manual concrete mixer consists of dozens of elements and parts. During production, special attention should be paid to the unloading hatch: its card hinges, latches and sealing must be of high quality and reliable.
Concrete mixers of this type are produced by industrial enterprises.
When manufacturing its bottom and the mouth of the bucket, it is necessary to strengthen the bars welded crosswise. It is better to make the bucket rotating together with the axis: this will complicate the frame design, but eliminate the need to seal the shaft in the very bottom of the bucket. The ideal mixer for this mixer is a frame type, welded to the shaft.
Also, many craftsmen, who have a perforator with manual forced switching, tried to make vibrating concrete mixers, but often the design was not very successful.
Below we will consider why this happens:
The solution above the vibrator should also be equal to its diameter. When these conditions are met, the quality of the solution will be excellent.
Do-it-yourself concrete mixer is easy to do, and the speed of your work will increase several times even with a simple mixer . When working, it is worth adhering to the technical documentation and following all safety rules. And then, the construction of the house will be much faster!
( 1 grade, average 5 out of 5 )
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