Feed bucket elevator rationality
Feed bucket elevator is the main one working process, feed is reasonable not only affect the performance of bucket elevators, but also after the sequence work (promotion and
discharge process) will have a ripple effect. Thus, studies and efforts to implement reasonable feed has very important significance.
Measure the feed bucket elevator is reasonable, in general, consider two aspects: First, fill factor; Second, feed resistance. As we all know, of course, is feeding resistance
as small as possible, and fill factor is Elevator conveyor not necessarily better. In the design and field operation hoist when it reasonable feed
, Is essentially filled with the appropriate coefficients, feed resistance.
1 filled with an appropriate coefficient
Fill factor is too small (too small bucket interior quantity) is a typical "big horse car" phenomenon; fill factor too big and are not economical, because it is possible to
enhance the machine and the unloading process will be a "backflow" . Thus, the meaning of the appropriate coefficient chain conveyor filled: each of the other components to work
Conditions (such as raising the belt tension, wheel diameter and speed, etc.), bucket seat loaded in the machine after upgrading the material can successfully discharged from
the discharge port without generating the maximum fill factor reflux.
Fill factor affecting many factors, but can be summed up in the following aspects:
(A) feeding method
For grain, oil, feed mill workshop of bucket elevator feed forward manner with feed, reverse feed and bi-feeding, choose which feeding method should consider speed. When
upgrading the speed and flow of material with the base material when the flow rate are relatively small, generally used in reverse into
Materials, bucket inside scoop on the part of the base material and then filled directly from the inlet part of the material, which is conducive to the improvement of fill
factor. If you upgrade the speed and flow of material with the base material when the flow rate is relatively large, the material impact on the larger bucket, reverse feed is
Affects only filled coefficient improved, and additionally increase the power consumption can be used in this case the forward feed. If you fill factor is not easy to achieve
the required value, the "yield" falters, then the feed can be bi-directional. It should be noted that grain, oil, feed mill workshop
The bucket elevator feeding method is likely by the process, process layout of the decision.
(2) internal friction coefficient and the bottom wheel speed
Bucket seat when loading the machine, in theory, the material surface conform to the pole, as the center of the logarithmic spiral composed of logarithmic spiral surface
equations. Calculation, mapping show that: the internal friction coefficient of the material which filled coefficient; bottom wheel speed is slow, the material inside the bucket
(3) bucket shape
In practice, it was found that the shape of bucket filled with impact factor. To increase the fill factor, but also conducive to the discharge, regardless of what type of
bucket, their basic form are large mouth with small, low internal high outside, bottom radiate round (no sharp corners). For enhancing the lightweight materials such as Google
Shell, bran, etc., in order to drain away the bucket of feed air to facilitate the bucket bottom opening (about 2 ~ 5mm in diameter), which is perforated bucket.
(4) feed flow
Filled with feed flow coefficient affecting one of the determinants. Some hoist mounted at the inlet feed flapper, to adjust the feed inlet cross-sectional area; Some hoist is
equipped with a buffer feeding means for regulating the feed flow.
Above mentioned factors influence coefficient filled grouped into two categories: one for on-site operation of uncontrollable factors, such as feeding method determined by the
designer, was promoted internal friction coefficient depends on the material, the bottom wheel speed and head round the same speed; second category is the uncontrollable factors
that the job site
Reliance on manual adjustment to control the feed flow rate as described above. On-site operation, adjust feed rate to control fill factor of great significance.
2 The feed resistance factors
Feeding resistance factors are mainly the following two aspects.
(A) the resistance movement
Bucket seat while loading the machine while running, its resistance on the one hand the performance of the feed bucket materials and friction between the material and the
friction between the inner wall of the base, the friction between the material and the material; hand , is the driving force of the material bucket. They are both running in the
Proportional to the distance.
(2) material impact on the bucket
When the reverse feed, there is a direct part of the material is filled into the bucket and going, so that the material is produced on the bucket wallop. If the speed of the
belt and the material to enhance the flow of material to the base when the flow rate of greater material impact on the bucket is also larger, feeding resistance increased