As China's economy has accelerated the process of global integration, quantitative packaging commodities have sprung up in retail markets across the country. The General Administration of Quality Supervision, Inspection and Quarantine issued Order No. 43 "Regulations on the Measurement of Quantitative Packaging Commodities" In 2002, the third customs clearance "HACCP" system certification management regulations. In view of the accuracy and safety of food measurement, various retail commodity manufacturers across the country, especially the food production industry, have equipped packaging measurement and detection equipment to meet the requirements of the above regulations. Among them, the multi-head intelligent multihead weigher are especially Favored by user companies.
At present, there are two types of multi-head weigher equipment at home and abroad: one is a multi-head intelligent combined weigher (hereinafter referred to as a multi-head weigher); the other is a multi-unit weigher. Although the latter can weigh different loads by multiple weighing heads, each weighing hopper is discharged to the same loading device, but this type of scale does not have a combination function, the user must distinguish when selecting a multi-head weigher, otherwise It is difficult to meet the requirements for use.
What kind of products are suitable for multi-head intelligent combined weigher?
Multi-head weigher are mainly used for high-speed, high-precision automatic quantitative weighing of uniform and uneven particles, regular and irregular bulk goods, of which the first category is large and light weight items, and the second category is easy to stick flow difference Items; the third category is foods that are difficult to separate; the fourth category is fragile packaged foods; the fifth category is frozen packaged foods; the sixth category is leak-proof packaged foods; and the seventh category is dried fresh fruits and local products.
What should users pay attention to when selecting multihead weigher?
1. Accuracy requirements
In order to reduce the losses caused by multiple products when users choose multi-head scales, they are generally willing to choose high-precision multi-head scales. Therefore, users must understand the important tolerance requirements of packaged food before purchasing multi-head weigher. In China, the regulations on the content of quantitative packaged goods are the same as OIML International Recommendation No. 87. See the chart for specific description:
|Net Weight Q||Negative Deviation T||Net Weight Q||Negative Deviation T||Net Weight Q||Negative Deviation T|
2. Requirements for metering speedThe accuracy level of a multihead weigehr is named after the x () level, and the numbers of different levels must be filled in () to distinguish its level. If the accuracy level is x (1), then first, the maximum allowable deviation mpd of each load relative to multiple weighing values is the same as T in the above table; second, the average and setting of multiple weighings The maximum allowable error of the value Mpse is not greater than 1 / 4T. Of course, the user can choose a higher accuracy level, such as K (o. 5) level, for the packaged items of higher value, the user can choose this type of accuracy level, but the higher the higher the sales price of multi-head weigher.
When users choose multi-head weigher, in order to get good economic benefits, while choosing high-precision equipment, fast speed is also very important. At present, the measurement speed of ordinary domestic multihead weigher is about 70 packs / min, but the more the number of weighing heads, the faster the speed, such as: 10-head scales and 14-head scales are 65-140 packs / min, 16-head scales and 20 heads The speed of the scale is 190-240 bags / min. At the same time, users should also pay attention to the lifting conveyor and packaging machine with a matching speed at the front and rear ends of the multi-head weigher to complete the entire process from weighing to packaging.
3. Material specific gravity and particle size requirements
For materials with different specific gravities, when selecting multi-head weigher, because the specific gravity of the materials is different, the volume of even materials of the same weight will vary greatly, so users cannot look at the maximum combined weight of the scale when selecting multihead weigher. Also refer to the maximum combined capacity, such as: a multihead weigher with a maximum combined weight of 1000 grams, generally there will be two specifications of the maximum combined capacity of 2000ml and 5000ml respectively.
For materials with different particle sizes, users should first look at the particle size of the weighed object when choosing a multi-head scale. Generally, bulk materials are divided into blocks (> lOmm), granular (> 0.5-lOmm), and powder (≤0 .5mm) Three cases. Among them, for powdery materials, the user should choose the center column, feeding vibrator, transition hopper and weighing hopper in the feeding process are sealed, leak-proof, waterproof multi-head scales. Finally, it should be emphasized that when choosing a multihead weigher, users must consider the reliability of the equipment and the interchangeability of parts maintenance. Do n’t think that it is enough to meet the functional requirements. Generally speaking, the multihead weigher is a device that can not be stopped in the middle of the production line. If the equipment is blindly pursued to be cheap and usable, regardless of its reliability and interchangeability, then it is likely to cause many problems for users in the production process.
At present, the price of foreign multi-head intelligent combined weigher is generally relatively high, which directly increases the user's cost of use. And through the development of domestic intelligent combination scale enterprises, the products have been continuously innovated and improved, and have become the first choice of the majority of user enterprises. For example, Guangdong Kenwei Intellectualized Machinery Co.,Ltd., its product lineup, weighing accuracy and weighing speed of combination scales are all leading domestically, and are favored by the majority of user companies.