The working principles of auger conveyor in conveying materials is basically divided into three categories: one is the pushing method, the other is a centrifugal induction method, and the third is gravity sliding method;
This kind of method generally uses the spiral blade to carry on the transportation material, commonly used in the discharge transportation of warehouse bottom. The material is often filled with helices, and the static pressure of granular materials is larger. The gravity of each material itself is much smaller than other forces (screw thrust, friction force, static pressure). The resistance of this kind of screw is very large, and it must overcome the friction formed under great pressure. When working, the material seems to be a nut, and the screw acts as a nut bolt. As long as the nut does not rotate (or rotates slowly), the nut can move along the axial direction by using the rotation of nut bolts. The warehouse bottom discharge spiral often adopts a variable pitch helix and has a larger pitch at the exit end.
(2) Centrifugal Induction Method.
It is used for vertical, steeply inclined auger conveyors, or any higher speed auger conveyors. The working characteristic is that the material is filled between two kinds. At the high speed of the spiral, the loose material is subjected to centrifugal forces much more than other external forces such as gravity.
(3) Gravity Slide Method.
The spiral has a relatively low speed, and the material on the surface of the spiral is far more affected by gravity than by centrifugal force. As the rotating material of the spiral continues to slide down the spiral, there is an axial displacement, which is essentially the principle of the CX screw machine. The filling coefficient of screw machines following this principle is generally less than 0.5. Because of the overfilling, the material does not slide down the spiral surface but is churned by the spiral and falls over the spiral axis. Therefore, it does not obtain a large axial velocity. Since the material in the slow spiral is more affected by gravity, it is not suitable for vertical spiral or upward conveying situations with large inclination angles.
The principle of sliding down method, although the twenty value is small, the conveying capacity is low, is suitable for easy lumping, abrasive material since the material is loose, free-rolling down, and less squeezed. With standard spirals, it not only maintains a relatively fast sliding speed but also has certain adaptability to inclined conveying (inclination is generally within 20°).
(4)Maintenance of Auger Conveyor
Since the auger conveyor is composed of a spiral housing section, a drive section, and a support section, when maintaining and servicing the auger conveyor, we also have to maintain it partly. As for the maintenance of the shell of the auger conveyor's spiral, since the shell is generally undamaged if the material inside is acid and alkali corrosive material, you should pay attention to clean the shell of the conveyor when it stops. The auger conveyor's drive unit consists of two main parts, the gearbox, and the motor. For models that require oiling, they must be replaced regularly. This is the equivalent of the heart part of the conveying equipment, so be sure to in time and regularly change the oil.
As for the auger conveyor's main spiral, the spiral sleeve is a combination of the spiral core tube and a spiral blade. The spiral blade is also a wearable part. Depending on the different abrasive properties of the material, their service life will differ. When the gap between the spiral blade and the spiral shell part is large, or when the blade is deformed, it needs to be changed, otherwise, it affects the material transport capacity. As for the spiral core tube part of the auger conveyor, the main concern is the transmission shaft and connecting shaft, which need regular oil injection to ensure lubrication. Observe the thickness of the spiral sleeve. When working for a long time, the spiral shaft sleeve is most likely to be thinner by friction. To a certain extent, it will affect the concentricity of the spiral axis. Therefore, spare parts should be retained and replaced in time. In the inlet and outlet, the main observation is whether the bolts at the flange contact are tightened, whether there is any rust, and to deal with it in time.
Finally, in the inspection of the drive bracket, because the drive part is connected with other parts by the drive shaft, we need to regularly check the fastening of the drive bracket to prevent the drive part and the screw body part from being out of concentricity.
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