The Development, Status and Prospect of Automatic Weight Sorting Technology

The automatic weight sorting scale is an automatic weighing instrument for weighing individual products pre-loaded with discrete products or bulk items. Among them, the automatic weight sorting function can also be called an automatic weight sorting scale. The automatic sorting scale can also be called an automatic weight detection scale. The technical development of automatic sorting scale products in China is relatively late. Although after the reform and opening up, some petrochemical enterprises have imported some automatic checkweighing products in equipment imported from the investment projects, but overall, automatic sorting scales are still relatively unfamiliar to our country. The earliest self-developed sorting scale products in China can be traced back to 1998. The large-scale ZJC10/50 automatic checkweigher jointly developed by Beijing Lifting Transport Machinery Research Institute of Mechanical Department and Beijing Best Industrial Weighing Technology Company adopts OIML R51. As for the testing method, some state-owned and private enterprises have also launched their own automatic checkweighing products, but they are basically primary products with relatively large scale and low accuracy once the weighing is small.

The actual promotion of automatic checkweighing products should be implemented in the beginning of this century by the General Administration of Quality Supervision, Inspection and Quarantine of China in accordance with the latest version of the R87 International Recommendation “Net Content of Prepackaged Goods” formally issued by OIML in 2004. In 2005, it revised and issued Order No. 75 of the "Measures for Supervision and Administration of Quantitatively Packaged Commodity Measurements." The application of the automatic weight sorting scale, which is one of the indispensable metrology and inspection equipments on the package logistics quality testing line, was formally mentioned on the agenda. At this stage, the original products of Japanese companies Anritsu, Ishida, Yamato and South Korea entered the Chinese market. The company Mettler Toledo was first adopted in China. Some localization gradually introduced a series of sorting scale products. Recently, products of some advanced Western industrial countries have also begun to enter the Chinese market. Companies such as Sartorius, Bizerba, and Thermo Fisher have begun some localization. In recent years, some domestic enterprises have also started independent development work, such as Zhuhai Dahang Technology, Hefei Zhengyuan, Xuzhou Saim and other company's sorting scale products. At present, the large-scale production of sorting scales in China is at the initial stage, and new national standards and verification procedures are being developed with the OIML-R51. Some domestic old companies mainly produce large-size weight sorting scales for the chemical logistics industry. For small-size and ultra-small-size weight sorting scales, due to the relatively high technical difficulty and too small indexing value, most of the domestic enterprises still have In the imitation phase, high-precision sorting scale products have been dominated by foreign brands until now. Currently, automatic sorting scales (referred to as sorting scales) are the most popular among automatic sorting scales in China. The selection scale has two types of checkweighing and sorting functions. However, regardless of checking or sorting, the sorting scale is a weighing instrument that checks the weight of the weighed articles according to a predetermined weight range limit for discontinuous preloaded discrete loads. For items of different weights, sort by the nominal setting difference.

There are two types of test objects for sorting scales, one is prepackaged goods, and the other is unpackaged items. Sorting scales are generally used on the production line of a product, after a gravity or volumetric automatic loader or filler, for weight sorting and rejection of pre-set non-conforming products, or for articles to be weighed. Grading classification of weights. The scale's weighing accuracy is higher than that of the gravity-type automatic filling scale. It is 15 times higher than the packing scale for the sorting scale of the same level. Prospects for the recent development of automatic sorting scale products in China are as follows:

Since the automatic sorting scale product is used for the on-line quality inspection of packaging and logistics, in order to achieve the highest production efficiency, it is required that the measurement throughput speed of the product itself be up to 300~400 times/min, and the highest sorting accuracy can reach 0.2g ( 3σ). The latest sorting scale products have been developed in the direction of intelligentization. According to the size and measurement speed of different inspected items, the most appropriate screening and metering time can be determined automatically; when ROM/RAM, A/D, photoelectric device, communication and other abnormalities At the same time, there are prompts and measures to implement automatic adjustment and self-diagnosis functions; as the latest sorting scale products have ARC NET and ETHERNET network communication functions, the system can realize centralized control of the computer combined scales with the previous processes, and remote Remote operation and process feedback control.

In recent years, the selection of weighing scale products has tended to be compact and multi-functional. The weight sorting scale integrated with metal detection, X-ray foreign object detection and sorting has been introduced. At present, general metal detectors can detect 0.8~1.0mm metal foreign objects, and the detection speed can reach 40~60m/min. Since metal detectors cannot detect foreign materials such as hair, thread, bones, and glass, a new X-ray foreign body detector has been developed for this purpose. In addition to detecting iron and stainless steel iron balls, the device can also detect foreign matter. Foreign objects such as hair, threads, bones, and glass. Detection speed up to 65m/min.