Shanghai Qin Chou Industrial Company specializes in selling electronic scales, including digital floor scales, digital platform scales, explosion-proof electronic scales, digital drum scales, and digital vehicle scales. According to the technical department of Zhejiang Keda Weighing Instrument Co., Ltd., China is the country with the largest production and operation of vehicle scales in the world. Due to inaccurate weighing, short service life, and poor stability of scale operations, frequent inspections are required, leading to economic losses that exceed those caused by issues with commercial scales in the past. Therefore, revising the standards and calibration methods for vehicle scales is a very important, urgent, and serious issue.
In conjunction with China's situation, because the types of vehicles in China are very complex, there are many different models from various countries driving on domestic roads, and there are also many modified vehicles, which makes it difficult to specify the concentrated load values for scales. Additionally, since China has been using the average load method to calibrate vehicle scales, some manufacturers, in pursuit of cost savings, have made the scale platforms very fragile. Although they can pass one-time calibration loading, they cannot withstand repeated vehicle loadings and soon experience structural damage. Some people in China suggest determining whether a scale is "qualified" by checking its stiffness. This method was used in the 1970s and 1980s in China mainly for rail scales (especially deep pit rail scales). However, this method is not very reasonable or easy to operate because the load-bearing part of a vehicle scale is a component rather than a simple mechanical device, making it hard to check its "stiffness." Moreover, calculating its "stiffness" simply through calculations is not very reasonable. More importantly, overseas, whether it is vehicle scales or rail scales, there are so-called "lightweight structures" for load-bearing components. These scales may deform significantly when loaded, but they still have long operational lifespans and ensure accurate weighing. Therefore, judging using "stiffness" not only makes it hard to operate but also limits the development of load-bearing components. JS-30BM counting heavy scales.
This is because modifying a procedural standard not only involves the interests of manufacturers but also relates to users' benefits. Manufacturers need to change existing production processes and designs to meet new requirements and conduct experiments to see if new products satisfy new regulations. During the revision process of overseas procedures, manufacturers participate, allowing users to understand the performance of new products and determine what range and accuracy levels of products are more reasonable and cost-effective. Most of China's scale manufacturers already have the ability to participate in the creation and modification of procedures. It is hoped that more experienced manufacturers will be involved in the formulation or revision of procedural standards in China.
For the calibration of vehicle scales in China, it used to follow R76 domestically. R76 is the basic standard for scales, focusing mainly on small commercial scales. In the U.S.'s Handbook 44, I can see that Class III scales are divided into two categories: Class III and Class IIIL. Class IIIL is aimed at large scales such as vehicle scales, axle load scales, rail scales, livestock scales, and large hopper scales. It also specifies that for scales with over 1000 divisions, for every additional 500d, the error value increases by 1d, which is not equivalent to the R76 recommendation. Of course, these regulations should align with the country’s specifications for large-scale commodity measurement deviations.
Zhejiang Keda Weighing Instrument Co., Ltd. feels that revising China's vehicle scale standards and calibration methods should consider the following issues:
1. If China adopts the "rolling load" method, first, it needs to reasonably specify the concentrated load values for vehicle scales of various ranges. It should also be noted that the "rolling load" implementation cannot replace the "eccentric load" test of the scale.
2. Vehicle scales should still undergo uniform load testing to judge the nominal load, i.e., the maximum capacity.
3. Following the nominal load formula ?CLCN-0.5 to evaluate the rationality of vehicle scale design.
4. Whether to allow the use of bearing platforms exceeding three weighing segments with eight sensors and how many sensors are allowed for a full-bearing platform.
5. For outdoor vehicle scales without wind protection, what should the maximum number of divisions be?
These are all issues related to manufacturers and users who should pay attention to and correctly utilize vehicle scales for weighing. Finally, in the revision of individual standards and calibration procedures, there should be manufacturer support; otherwise, it would just be textual revisions without substance. Significant modifications should be supported by experimental data and economic analysis. There should also be legal provisions for handling original vehicle scales after revisions. With the development and progress of China's weighing industry over these years, there is now sufficient experience and capability to revise vehicle scale standards and calibration methods suitable for China's national conditions.
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Shanghai Qin Chou Industrial Company specializes in selling electronic scales, digital floor scales, electronic truck scales, digital crane scales, electronic balances, electronic platform scales, electronic desk scales, explosion-proof electronic scales, stainless steel electronic scales, hydraulic pallet truck scales, electronic drum scales, industry-specific scales, and commercial parts cabinets, etc.