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Analysis of bucket elevator output is not ideal causes and Solutions

Number of visits: Release date: 2020-07-28 10:44 source: admin

The output of bucket elevator can not meet the design requirements, which affects the normal production of the whole process line. This paper analyzes the factors affecting the output of bucket elevator, hoping to help the relevant personnel to solve such problems in the future.

Please make sure we can't meet the production commitment before we start the design. That is to say, what is the basis (data) to make clear that the output can not meet the requirements? Is it reasonable to consider these basis (data) to prove the problem? We should know that the production data that can truly explain the field bucket elevator must be generated under the following three conditions: first, the upper link of the feeding capacity is continuous and sufficient; second, the lower link of the material flow is smooth: again: Bucket elevator Normal operation (stop without blocking). So whether these data meet the above three conditions? We need to carefully check and verify the data on site.

After confirming that the on-site equipment output can not meet the requirements, we can start the following cause analysis and search process.

1: confirm the physical properties of lifting materials.

The physical properties mentioned here mainly refer to the bulk density, particle size and fluidity of materials. Because the output of bucket elevator is mostly reflected by the quality output, and the on-site measurement of quality and yield is more realistic, so the design quality output is different according to the actual proportion of the material to be lifted. The yield data we provide in various materials are based on 0.75 granular material and 0.5 powder material. It can be seen that the data on the data can not be taken directly, and can only be compared after corresponding correction. The particle size and fluidity mainly affect the filling coefficient of hopper. In order to facilitate and intuitive comparison, we often use corn flour as reference material for grain material and corn flour for flour material. Therefore, when upgrading other materials, please take the reference material as the standard to correct the output. (this analysis and search method is only used when the difference between the measured output and the designed output is small, because the difference of the material characteristics is not very big, so the impact of the material characteristics on the output is not very large.

If the upgraded material itself is a standard material or the output after correction is still unable to meet the requirements, we must continue to find out the cause in the next step.

 Bucket elevator

2: check the equipment configuration.

The relevant configuration mainly refers to the model of motor and reducer, the number of teeth of master-slave chain (chain drive), the model of dustpan, the distance between the buckets, etc.

Check whether the frequency of the configuration motor of the bucket elevator is consistent with the frequency of the power grid; confirm whether the speed ratio of the reducer meets the standard configuration. If it is chain drive, check the number of teeth of driving and driven sprocket at the same time, and make sure whether the comprehensive reduction ratio of reducer and sprocket is consistent with that of standard reducer. The above work is to exclude the influence of speed on yield. The speed of the increase is proportional to the speed of the increase, resulting in a decrease in the volume of the bucket. At the same time, due to the decrease of speed, the unloading mode of bucket elevator will be changed, resulting in an increase in the amount of return material, thus further reducing the output. At a certain limit, increasing the speed will increase the output, but it will also lead to the increase of material impact on the machine wall, which will increase the wall wear and improve the material crushing rate. It is also possible to increase the amount of material returned due to the material being thrown out in advance. Therefore, according to the requirements of the configuration of the lifting speed to meet the equipment in an excellent state and ensure the production.

However, to check the type and spacing of the dustpan is to exclude the influence of the lifting volume per unit time on the output under the same line speed. The effect of lifting volume on yield is obvious. The reasonable matching of the type of the dustpan also takes into account the factors such as large loading capacity, good material receiving and throwing properties and filling rate.

Therefore, if we want to meet the design output, the above configuration can meet the design requirements. Configuration problems may be caused by process selection and configuration errors caused by negligence of process personnel, or installation errors caused by configuration model delivery or installation site confusion caused by other reasons. Only when the lifting machine is finished, only a part of the lifting machine is completed from the factory. Such a long process leads to many uncertain factors, and configuration errors are inevitable.

If the above parameters are different from the standard configuration, please take measures or replace them in time. If no abnormality is found, please proceed to the next step.

 Bucket elevator

3: observe the process layout as a whole to see if there is any problem with the field installation interface.

It's a little difficult to make an accurate judgment on this point, but it is often a problem prone point. The judge should have a certain understanding of bucket elevator and have a little experience in handling it.

In this paper, only a few points which often appear in the field are put forward for reference.

The influence of feeding mode: the bucket elevator frame provides continuous feeding ports, the relatively high one is the reverse feeding port, and the low one is the forward feeding port. In general, it is recommended to use reverse feeding for granular materials and forward feeding for powder materials. But sometimes because of the need of the process, the grain material may also adopt the forward feed, but the output of the forward feed is only 80% of that of the reverse feed. In this case, our design output also needs to be modified accordingly.

Improper layout of feed chute: the improper arrangement of chute here refers to that the material flow into the feed inlet is not evenly spread along the width direction of the feed inlet due to the layout problem of the feed chute, but to a certain side, so as to offset the material receiving of the bucket, reduce the filling rate of the bucket, and deposit the residual material on the machine base, resulting in the occurrence of material blocking. In case of secondary problems, it is recommended to correct the feed chute. If there is not enough space in the inlet, the effect can be increased.

Too large corner of the chute at the outlet: the problem here is mainly due to the insufficient space position of the process, which leads to the too large corner of the discharge chute, resulting in poor material flow and material deposition, which eventually leads to a huge increase in the amount of material returned and the phenomenon of material blockage.

The problems in the field process installation may be strange and unpredictable, but we only need to grasp one fundamental principle: the material flow into the material inlet must be evenly spread in the width direction of the feed inlet, and there must be no deviation, and the material flow at the discharge port must be smooth without any material retention. We can respond to all changes with the same.

It is impossible to find a simple problem in the design process of the bucket elevator. We should not only focus on the single equipment in front of us, but also analyze and consider the problems from the perspective of the whole process. A lot of knowledge here still needs us to learn and sum up in practice.



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