The adjustment of the feeding port should ensure that the material at the feeding port is evenly spread in the width direction to prevent uneven feeding that may cause the feeding of the bucket elevator to be biased, resulting in uneven wear of the chain plate (or tape), hopper or sprocket, or deviation of the elevator chain plate (or tape). To achieve this intention, the following factors should be considered:
1) The slip angle of the feed chute should be appropriate to prevent material blockage before the feed inlet. The slip angle of the chute should be determined based on the characteristics of the material, the information and shape of the chute, and the operating conditions. It is generally stipulated that the slip angle should be 5 ° to 10 ° greater than the dynamic angle of repose of the material. For block shaped materials, materials with low moisture content, and materials that rely on mechanical force, the slip angle can be taken as a small value. For powdery materials, materials with high moisture content, and materials that rely on self flow, the slip angle should be taken as a large value.
2) The adjustment of the feed inlet should consider the loading method of the bucket elevator, in order to ensure smooth feeding and without adding any resistance to the elevator's movement (primarily referring to the resistance to increase material and the resistance to extract material). There are two loading methods for bucket elevators, namely the extraction method and the inflow method. The scoop type is primarily used for transporting bulk materials in powder, granular, and small block forms that are non abrasive or semi abrasive. Hoppers are generally sparsely placed because there is no significant resistance when retrieving materials, so the operating speed of the hopper is allowed to be relatively high. The inflow type is used to transport large chunks and materials with high grinding properties. The placement of the hoppers is very dense to prevent materials from scattering between the hoppers, and the operation speed of the hoppers is relatively low.
Regarding pull-out loading, the higher the material level, the greater the resistance during material extraction. To prevent overloading and material spillage, the height of the material surface should be lower than the horizontal plane of the lower chain wheel axle. That is to say, when adjusting the orientation of the feed inlet due to poor slip angle, the original planned feed inlet orientation can be appropriately lowered, which has a larger adjustment range.
Regarding inflow loading, in order to prevent materials from entering the lower part of the casing, the orientation of the lower edge of the feed inlet should be higher than the horizontal plane of the lower sprocket shaft. That is to say, when adjusting the orientation of the feed inlet due to poor slip angle, the feed inlet can be lowered appropriately, but the lowering direction is limited. In theory, the orientation of the feed inlet is not limited, and the higher the orientation of the feed inlet, the shorter the interval between the hopper loading sections, and the lighter the load on the machine. But when the orientation of the feed inlet is raised, on the one hand, it is necessary to consider adding guide rails (or guide plates) inside the corresponding casing to prevent the shaking of the chain plate (or tape), and on the other hand, it is also necessary to consider the problem of material blockage when jumping or stopping due to faults.
Article source: Guangdong bucket elevator
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