The difference between the most popular computer c

2022-08-04
  • Detail

The difference between computer combined scale and traditional quantitative packaging scale

since the birth of the first computer combined scale in the world in the 1970s, it has created a new era in the field of weighing instruments in the world. Because of its high speed, high-precision weighing and high degree of automation, it is widely used in the quantitative packaging of fried food, potato chips, candy, puffed food, biscuits, frozen vegetable food and other industries. Among them, the quantitative weighing of fried food can best reflect the revolutionary and superiority of the computer combined scale in the weighing instrument field. It solves the problem of large measurement error caused by the small weight of a single piece

fried food is a kind of packaged food made from the main raw materials such as fruit and vegetable seeds, nuts and nuts, with or without auxiliary materials, through the processes of frying, baking (including baking after cooking), frying, etc., including baking and frying. In the face of a large number of stir fry production enterprises, nearly half of the domestic units are still at the level of manual packaging, the accuracy of packaging measurement is unstable, and human factors are large. Some enterprises have outdated packaging equipment, backward technology, and poor measurement repeatability. Take a fried food factory in Zhejiang Province as an example. It is an enterprise specialized in producing all kinds of fried food. A year ago, it has been using the traditional measurement method (traditional quantitative automatic packaging scale). Its speed can only reach 25 times/minute, and the average error of single bag weighing is greater than 4G, that is, each bag (50g) has at least 4G error due to inaccurate weighing. Based on the annual output of 4000 tons, the enterprise alone loses nearly 400 tons of fried food every year The performance of computer combined scale in packaging accuracy and speed is much higher than that of traditional measurement methods. At present, the weighing error of multi head scales is generally set as positive deviation 0 0g; Weighing range g; Take yinweimin, Minister of human resources and social security of Hangzhou Zhongheng Bao, who once estimated the total number of people to be resettled by the Bank of China in the national and coal de capacity work. Taking a 10 head computer combined scale of China National Machinery Co., Ltd. as an example, the weighing speed can reach 70 times/minute, and the weighing speed can reach 130 times/minute with 14 head computer combined scales; In order to solve the problem of inaccurate product measurement, the enterprise tentatively purchased a computer combined scale (zh-a10). Using the computer combined scale, the enterprise sets the actual weighing error value as About 0g, with an average error of 0 6G, that is, the weighing error loss of each bag of fried food (40g) is reduced by more than 3 grams compared with that of manual weighing. It is confirmed through cost accounting that the computer combined scale has been used for less than half a year to recover all the investment. Now the enterprise has been used in all branches across the country

there are mainly the following differences between the computer combined scale and the traditional quantitative automatic packaging scale:

1. The weighing principle of the computer combined scale is different from that of the traditional quantitative automatic packaging scale.

the traditional quantitative automatic packaging scale is to weigh while feeding, and continue to feed before reaching the target weight data. When there is a small difference between the target weight and the target weight, a weighed object must be added, that is, fine measurement after rough measurement, If the weighed object is large or heavy, there will be a large error, which will affect its weighing accuracy. The computer combined scale is composed of multiple weighing units with independent feeding and discharging structure. Generally, the computer combined scale is composed of 8 ~ 32 weighing units. The computer uses the principle of permutation and combination to automatically optimize and combine the load of each weighing unit, and obtains the best and closest combination to the quantitative value for packaging. For example, a 10 head computer combined scale of Hangzhou Zhongheng Packaging Machinery Co., Ltd. is taken as an example. When weighing, each weighing unit is weighed, and the weight data of each weighing bucket is read into the computer. The computer carries out the optimal combination. According to the mathematical combination principle and computer technology, the ten weighing units can achieve a total of 1023 combinations, and the computer selects the combination closest to the target weight value from these 1023 combinations. In this way, the above manual repeated collocation and difficult to achieve quantitative value can be easily solved. The computer combined scale automatically weighs according to the set weight and automatically selects the combination closest to the target weight

2. The data reliability of the computer combined scale is different from that of the traditional quantitative automatic packaging scale

since the traditional quantitative automatic packaging scale weighs while feeding, the sensor weighs under dynamic conditions. If the weighed object is impacted or bounced, the sensor will sense the unstable weight data and cause errors, The computer combined scale is mainly used for the vibration feeding of the storage hopper for which the customer has no clear understanding of the fixture materials when selecting. The weighing of the weighing hopper is carried out under stable conditions, so the weight data obtained is of high accuracy

3. The drop error between the computer combined scale and the traditional quantitative automatic packaging scale

this error is a very significant error for the quantitative automatic packaging scale. When the weight value in the weighing bucket reaches the set value, although the electromagnetic vibration feeder has stopped, at the moment of stopping, the existence of a section of weighed object from the weighing bucket to the vibrator will eventually fall into the bucket, resulting in the so-called drop error, Although some quantitative automatic packaging scales reduce the drop error by shortening the feeding time, there are still different degrees of error due to the influence of system uncertainties such as flow rate and feeding uniformity. The computer combined scale is fed from the surge hopper to the weighing hopper. After the weighing hopper is completely stabilized, it sends out instructions to weigh, so there is no drop error

4. The difference between the weighing speed of the computer combined scale and the traditional quantitative automatic packaging scale

the traditional quantitative automatic packaging scale generally needs to go through the weighing process of rough measurement and fine measurement, especially the process of fine measurement needs to be added bit by bit, which takes a long time and affects the weighing speed. For example, the weighing speed of a quantitative automatic packaging scale of less than 1kg is generally 20 ~ 30 packets/minute, and the deformation is mainly concentrated in a local area clock of the sample, while the computer combined scale can generally reach 100 ~ 120 packets/minute for 14 weighing units in the computer's rapid optimization and combination operation, which is 4 ~ 6 times faster than the weighing speed of a quantitative automatic packaging scale, and is easy to cooperate with various packaging machines. It greatly improves the packaging efficiency and is more suitable for the needs of modern production management

5. The difference between the weighing range of the computer combined scale and the traditional quantitative automatic packaging scale

in the case of the same accuracy ", the weighing range of the computer combined scale is larger than that of the traditional quantitative automatic packaging scale. Generally, the weighing range of the traditional quantitative automatic packaging scale under the same accuracy is controlled within 4 times, while the weighing range of the computer combined scale in the small weighing section can reach more than 10 times. From a large number of test results, it can be seen that there is a difference in the weighing range between the two. For example, within the scale range of more than ten grams to one kilogram, the computer combined scale can meet the requirements of X (1) accuracy level, especially in the small scale section. If you want to keep the accuracy level unchanged, the traditional quantitative automatic packaging scale can only reduce the scale range and form a multi-stage scale. Only by producing multiple series products can you meet the requirements of the manufacturer. General manufacturers will hardly accept this phenomenon. This has brought limitations to its practical application, which can not meet the requirements of different packaging specifications (g) in some production fields but with similar accuracy. The above are the advantages of the computer combined scale. Another important feature of the computer combined scale is that it has corresponding application technologies according to different materials, such as waterproof, fragile, sticky, mixed weighing, number weighing, etc., which can meet the needs of all aspects In the past, China relied on imports from Japan, Australia and other countries. Due to the high price, it hindered the wide application and popularization of computer combined scales. (end)

Copyright © 2011 JIN SHI