In the middle of the 20th century, the manufacture of electronic weighing instruments using single or multiple weighing sensors in parallel marked the transition of weighing instruments from the past mechanical age to the electronic age. The combination of microprocessors and weighing sensors has triggered major changes in the field of weighing. With the progress of society, people have higher and higher requirements for the accuracy of weighing equipment. After the 1980s, electronic weighing instruments have been widely used in various fields from micro weighing to large-scale professional weighing due to their excellent performance.
Electronic truck scales are large-scale cargo weighing devices, generally consisting of a load carrier, a weighing sensor, and a weighing display instrument. According to different needs, electronic truck scales can be used with a variety of external devices to expand their functions. With the continuous advancement of China's scientific and technological level, China's electronic truck scale technology has reached the world's advanced level, and China is also a major manufacturer of electronic truck scales in the world. The most tedious part of coal yard management in the coal industry is the weighing and accounting of coal transport vehicles in and out. Due to the large number of turnover coal yards, the relatively poor environment for coal yard transportation, and the large number of coal transport vehicles, it is easy to make mistakes in coal transportation measurement, and the weighing truck scale is also prone to various failures, especially the relatively precise weighing sensor. Once a problem occurs, it often lasts for a period of time and involves multiple batches, which will bring huge direct economic losses to related coal enterprises. In addition to accurate weighing and measurement, the coal industry's requirements for electronic truck scales must also have stable performance, durability, and easy maintenance.
As an important basic component of electronic truck scales, weighing sensors play an important role in electronic truck scale weighing. Especially in the coal industry, weighing sensors are crucial for accurately measuring the weight of objects.
1  Introduction to the principle of truck scale weighing sensors
Electronic truck scale weighing sensors are signal output devices that use their internal bridge balance principle to convert mass signals into measurable electrical signals when weighing. Wheatstone bridge is widely used in weighing sensors because it can easily solve the compensation problem of weighing sensors, suppress lateral force interference, and suppress the influence of temperature changes.
Shear beam weighing sensors are less affected by eccentric loads, can withstand large lateral forces, have good rigidity, and have low installation height requirements. However, shear beam weighing sensors with a large range (above 30t) are severely restricted by installation space and installation conditions, and are difficult to replace, install, and maintain. In my country's coal industry, because the total weight of coal transport vehicles is large, it is very rare for weighing sensors in electronic truck scales with a range of more than 30t to use shear beam structures. Therefore, this type of weighing sensor can basically not be promoted and used in the coal industry.
With the rapid development of weighing sensor technology, electronic truck scales are more widely used in various industries. Different products have different characteristics. According to different application scenarios, the selection of weighing sensors is crucial. According to the actual application environment and characteristics of the coal industry, combined with the introduction of different types and characteristics of weighing sensors in this article, as well as the analysis of actual application cases, we can analyze that for electronic truck scale users in the coal industry, choosing spherical bridge series digital weighing sensors is a good choice.