Concrete mixer is an integral part of any construction site. If during the construction of small structures it is possible to prepare cement mortar by hand, it is simply impossible to do without a concrete mixer during the construction of large structures. Today, concrete mixing tanks can be purchased in any building market for domestic use. Their cost is comparable with electric jigsaws or circular saws.
Concrete mixer device.
Varieties of concrete mixers
Cement and concrete mortars are prepared by various methods, but often forced-type concrete mixers or gravity devices are used for this.
Gravity mixers operate on the basis of a drum mechanism, which is equipped with blades. Due to this, the solution of cement powder, sand and water is mixed without stopping in the rotation mode.
Forced action concrete mixers are used not only for the manufacture of cement mortar, but also to create other mixtures. For example, at plants with the help of such a device they make a dry mixture, which is used for industrial processes. Forced concrete mixers also work on the basis of a rotational mechanism that kneads the ingredients into a single mixture.Back to table of contents
Concrete Mixer Device
The basis of the design of gravitational devices are the following components:
The scheme of forced concrete mixer.
- drum mechanism;
- frame constructed from several parts by welding;
- locking element;
- rotary device;
- running equipment;
- electrical equipment.
The drum mechanism is located in the ball bearings of the traverse. The tensioning device is a plate placed under the engine, which ensures the functioning of the drum mechanism. The shaft, rotating in ball bearings, includes in its design a supporting gear gear and a V-belt transmission pulley.
Scheme of work of the concrete mixer.
The drum mechanism, which serves as a mixer, holds a small bezel consisting of a certain number of toothed sections. For convenience during transportation the pole of the tubular structure is produced with the possibility of dismantling provided.
In some cases, to ensure stabilization of the concrete mixer, additional supports are placed. Rotary device provides free repositioning of equipment. Using the flywheel, you can pick up the desired position and fix the device in this form.Back to table of contents
Use of concrete mixers depending on their device
Scheme two-shaft concrete mixer.
When using a concrete mixer will need to act in a specific sequence. First of all, you need to make sure that the equipment is in good condition. After that, you need to start it idling, and if everything is in order, you can proceed to work directly.
The drum mechanism will need to be switched to the rotation and loading mode. After starting the concrete mixer, you must first fill it with water, then pour dry cement, and then add screened sand and gravel (if necessary). As soon as the mixing is completed, the drum mechanism must be switched to the standard mode, lower the neck of the concrete mixer and pour the prepared solution into the previously prepared container.
The forced concrete mixer, which is also known as a double-shaft mixer, has external and internal blades in a drum mechanism. In the case of contact of gravel under their base, a special mechanism operating under the spring damping support pivots into the body. Therefore, the blades work without stopping, as their functionality is provided by the clamping system of springs.
Scheme of gravitational mortar mixer.
The device also has 2 scrapers that are connected to the rotor. To ensure the stable functionality of the drum mechanism, it is recommended to trace the size of the gap between the scrapers, blades and the inside of the tank.
The mixture can be poured into the tank by various methods. In some cases, this is done on its own, especially when the concrete mixer has an average value. In other situations, a special equipment called skip acts as a mixture loader. This is the simplest bucket, rising and unloading with high-strength cables.
The drum mechanism, equipped with cables, is connected to the pulley. This design is put on the shaft, and in the process of its rotation it moves in the direction of revolutions of the axis. The start handle serves as a lift of this design. Cables are fixed with steel bolts and plates, one of which is stop and the other is simple.
Lifting skip is regulated by the following devices:
Installing a concrete mixer.
- braking tape;
- special roller, located in the bearings.
If it is necessary to lift the bucket, it will be necessary to actuate the crank and turn it to the left. This will help loosen the braking band, promoting skip lifting. Upon reaching the desired height, the skip will move the cradle, thereby disabling the friction clutch. This will trigger the braking system. To skip the handle, the handle turns so that the friction clutch is activated.
Upon completion of the preparation of cement mortar concrete mixer turns over a simple effort. If the equipment is too large, it is usually equipped with a special device that performs this action on its own.
In forced concrete mixers, the solution is discharged through a special hatch located at the bottom of the tank.
Small concrete mixers are equipped with hand-driven mixing, larger equipment has an electric motor of medium power, which mixes the mixture without any help. It is worth remembering that electric drive devices are harder to master, since the management of such equipment requires certain skills and experience with concrete mixers.
The difficulty lies in the fact that the functioning of such a device should not stop the rotation at all. If it stops, the mixture will flow out of the tank in a short period.