Ways to Improve The Efficiency of Quantitative Packaging Scale

1.Preface

Quantitative packaging technology has been widely developed and applied, quantitative packaging scale is also more and more widely used in the production line. Quantitative packing scale is an automatic weighing device which can automatically pack a large number of bulk materials according to the set program. Automatic quantitative packaging scale is mainly used in automatic quantitative packaging of industrial and agricultural automation production. The whole weighing process is controlled by computer and completed automatically. It has the advantages of high weighing accuracy, labor saving, convenient maintenance and simple operation. In this era of time is money, it is very important to improve work efficiency, but for the packaging scale, it is almost impossible to give consideration to both quantitative speed and quantitative accuracy. Therefore, it is quite difficult to improve both accuracy and efficiency, which may increase a certain cost. Therefore, this paper mainly discusses how to improve the work efficiency of quantitative packaging scale on the basis of ensuring the accuracy.

2.The relationship between accuracy and speed

2.1 analysis of working process of quantitative packaging scale

Starting from the working process, the analysis generally includes: in the process of front feeding, adding more materials as much as possible in a shorter time, so as to shorten the weighing cycle and improve the work efficiency of quantitative packaging scale; Compared with the first stage, the last stage takes a long time to feed, and only 5% - 10% of the rated dosage is added, so that the accuracy of the packaging scale is guaranteed. In order to improve the working speed, in the process of front feeding, the flow should be as large as possible, so that the closer the feeding value is to the rated value, the better; In order to improve the accuracy of the angle of analysis, the smaller the flow rate of the final stage feeding, the better the accuracy. However, in actual operation, it is not as mentioned above. At the end of the previous feeding process, the impact force brought by the material causes oscillation ripple on the scale and damages the scale to a certain extent; If the front stage material flow is increased, the impact force will be greater and the peak value of oscillation will be greater. In addition, if the feed value set by the previous stage is closer to the feed value set by the last stage, the peak value of shock oscillation caused by it will increase, which will cause it to exceed the feed value set by the last stage, and then lead to the closing of the last stage. However, the actual weight value does not exceed the feeding value set by the last stage, resulting in a relatively large error. Therefore, in order to prevent large error, some traditional methods are used, such as reducing the feeding flow of the previous stage or adding another stage to reduce the impact force, Thus, the peak value of the impact force brought by the material on the scale will not exceed the final feeding value, so as to maintain the equipment and ensure the accuracy of the work. Although from the accuracy of the work, this ensures the accuracy of the packaging, but from the perspective of work efficiency, either increasing the feeding time of the previous stage or increasing the feeding time of the last stage will lead to the reduction of the work efficiency of the packaging.

2.2 analysis of automatic control function

In order to improve the accuracy and stability of the quantitative packaging scale, a lot of automatic control theories are added into the automatic weighing controller, which has many automatic functions, such as the automatic alarm function of zero abnormal, the automatic alarm function of out of tolerance, the function of zero tracking and the function of correcting the automatic drop, etc. The above functions have one thing in common, that is, they are all based on weight related data as a basis for measurement, and there are mainly two monitoring data, one is the empty scale value detected after unloading, the other is the full scale value detected after charging. On the basis of this kind of dynamic work, it is difficult for the staff to accurately measure the values of these two points. The traditional method is to detect the zero value before each feeding operation, then detect the full scale value after the feeding operation, and finally take them as the data basis of automatic control in sequence. However, the quantitative packaging scale is different. It is a dynamic operation process. Relatively speaking, some data and information related to weight are changed from dynamic to static. Therefore, the detection work needs to be carried out in a relatively stable time. If we want to detect the data related to weight every time, we have to wait for the scale to be in a stable state, Then the static weight data is detected, which will extend the working cycle time and reduce the work efficiency, so that the accuracy can not be guaranteed and the efficiency can not be improved at the same time. It is worth noting that the value to be measured must be set properly to ensure that the required weight can be met after the small gate is closed once. Otherwise, if the weight is lower than the required value after the small gate is closed once, the small gate will be re opened for feeding, resulting in out of tolerance. In addition, if the change of the parameters is not appropriate and reasonable, the phenomenon of small gate feeding will also occur. Therefore, the parameters must be readjusted before the operation, so as to ensure the accuracy of weighing and avoid the phenomenon of out of tolerance. Only when the accuracy is guaranteed can we talk about the method of improving the working speed.

3. Ways to improve efficiency

First, comparative discrimination is prohibited. When the two-stage feeding mode is adopted, after the previous feeding process is completed, it is not able to judge whether the relevant weight data reaches the closing value set by the last stage feeding immediately, but after a period of time delay. In the extended period of time, we can't judge it, we can only judge it after the extended period of time, which can effectively avoid the wave crest caused by the impact force brought by the previous feeding on the scale. By adopting such a control method, the feed value of the former stage is close to the feed value set by the last stage, resulting in the increase of the feed value of the former stage and the decrease of the feed flow of the last stage. If the time in the material flow process remains unchanged, it can not only effectively shorten the operation cycle of the packaging scale, but also improve the work efficiency. Through this method, it can be proved that the greater the ratio of the feed flow of the former stage to the last stage, the more significant the work efficiency will be. Second, group detection. Grouping detection is based on the principle of main mathematical statistics and the knowledge of error analysis. The main causes of large errors in quantitative packaging are systematic errors and random errors. The sum of absolute values of systematic error and random error is the total error difference. The systematic error is fixed, while the random error is symmetric, unimodal, bounded and compensated. According to the characteristics of system error and random error, the whole packing scale is divided into two groups: check side group and non check side group. The two test groups are adjacent test groups, which are used as the sampling group, and the sampling group interval method is used for the non inspection side group. In the process of detecting data, the full scale value and the empty scale value in the stable state should be recorded respectively, and then the average value of this group of recorded data should be calculated, and then these data values are compared through the list, and it is used as a data basis for automatic control detection, so as to control the detection process of the next adjacent detection group and the next detection group. Finally, select some test data from the test group and non test side group, and then control the number of samples and sampling interval. Through the grouping detection method, it can reduce the error caused by the random detection of quantitative packaging scale and the influence on the accuracy of the weight value. Because there is no need to record all kinds of weight data in the non inspection side group, it does not need to spend time waiting for the packaging scale to work in a stable state, which saves time and improves the work efficiency. Third, in order to reduce the impact of the compensation time of the drop on the weighing speed, the weighing device and the feeding device should be fully and well combined for an overall design, so as to shorten the distance between the weighing hopper and the feeding hopper as far as possible; It is also necessary to reduce the loss of materials in transportation, so as to reduce the drop; In addition, it is necessary to shorten the transportation time of materials, reduce the impact of symmetrical measuring bucket of falling materials, and reduce the peak range of shock wave, so as to shorten the stability time. The above measures can effectively improve work efficiency. Fourth, in the weighing device, in order to ensure that the weight signal of the material contained in the weighing bucket can be accurately transmitted to the weighing sensor, it is necessary to require that the limiting device on the weighing bucket will not generate other additional forces to the weighing bucket, so it is necessary to reserve enough space for movement when loading, Moreover, the impact of material loading and unloading and the vibration generated by the action of each executive component will be transmitted to the weighing bucket through the steel structure support, which will slow down the speed of the weighing bucket to achieve stability and prolong the time of judging the stability of the feeding process. To solve this problem, we need to design the weighing device, We should not only ensure that the weight signal can be transmitted stably and accurately, but also consider whether there is a better limit structure to make the weighing bucket run quickly and stably. Finally, we also need to consider the vibration reduction measures to shorten the time of judging stability.

4.Conclusion

Accuracy and speed has always been the goal of people, especially in today's society, only the quality and speed can keep up, the enterprise can get long-term development. In the previous paper, it is specially mentioned that the application of forbidden comparison discrimination method and grouping detection method can effectively improve the working efficiency of the packaging scale on the basis of ensuring the quantitative accuracy. However, the quantitative packaging scale is a highly integrated automatic control system of mechanism, electricity and instrument, and its sensor and mechanical structure include the installation structure of the scale bucket, the feeding mechanism, the feeding mechanism and the control system Driving elements and unloading mechanism have great influence on the accuracy and speed of quantitative packaging scale. Therefore, we should consider how to improve the work efficiency of quantitative packaging scale from multiple angles.

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