Principle and Basic Knowledge of Weighbridge

A large scale set on the ground, usually used to weigh the tonnage of cargo carried by a truck. The weighbridge is also known as a car scale, in English: scale. It is the main weighing equipment used for measuring bulk goods in factories, mines, merchants, etc. Before the 1980s, the common weighbridge was generally a mechanical weighbridge constructed purely mechanically using the lever principle, also known as a mechanical weighbridge. In the mid-1980s, with the increasingly mature technology of high-precision weighing sensors, mechanical weighing scales were gradually replaced by weighing scales with high accuracy, good stability, and easy operation.

The weighbridge can be divided into U-shaped steel weighbridge, channel steel weighbridge, I-shaped steel weighbridge, and reinforced concrete weighbridge according to its structure; According to sensors, it can be divided into digital weighbridge, analog weighbridge, and full weighbridge; The weighbridge is commonly known as a weighbridge. Their basic configuration is the same. Sensors, junction boxes, printers, and weighing instruments are all required, and today's weighing scales can be equipped with computers and weighing software.

Scale, also known as the "scs" series in the industry, is commonly used for weighing weighing weighing weighing weighing weighing scales ranging from 30T to 200T. Some manufacturers can produce weighing scales up to 250T. The standard configuration of a weighing scale mainly consists of three main components: a load-bearing transmission mechanism (scale body), a high-precision weighing sensor, and a weighing display instrument, which can complete the basic weighing function of the scale. Printers can also be selected according to the requirements of different users Large screen displays and computer management systems are needed to achieve higher levels of data management and transmission. Load bearing and transmission mechanism; Flash& Amp; Flash; A mechanical platform that transfers the weight of an object to a weighing sensor, commonly available in two types: steel structure and steel-concrete structure. High precisionLoad Cell; Flash& Amp; Flash; It is the core component of the weighbridge and plays a role in converting weight values into corresponding measurable electrical signals. Its quality directly affects the quality of the entire weighing instrument. Weighing display instrument; Flash& Amp; Flash; Used to measure the electrical signals transmitted by sensors, and then processed and displayed weight readings through specialized software, and the data can be further transmitted to printers, large screen displays, and computer management systems. Printer: Used to print weight data forms. Large screen: used for remote reading. Computer management system: used for further processing, storage, transmission, etc. of weight data. The emphasis on parameters and emphasis varies among different companies' weighbridges, but they are generally the same. Let's take Koda Weighing Instrument Factory as an example.

(1) The characteristics of digital weighbridge: Digital weighbridge solves the problem of weak transmission signals and interference - digital communication.

① The maximum output signal of analog sensors is usually tens of millivolts. During the transmission of these weak signals through cables, it is easy to be disturbed, resulting in unstable system operation or reduced measurement accuracy. The output signals of digital sensors are all around 3-4V, and their anti-interference ability is far hundreds of times greater than that of analog signals, solving the problem of weak transmission signals and interference;

② Adopting RS485 bus technology to achieve long-distance signal transmission, with a transmission distance of no less than 1000 meters;

③ The bus structure facilitates the application of multiple weighing sensors, and a maximum of 32 weighing sensors can be connected in the same system.

(2) Digital weighbridge solves the problem of temperature deviation and time effect creep - intelligent technology

① Preventing cheating by using simple circuits to change the size of the weighing signal;

② The digital weighbridge can automatically compensate and adjust the effects caused by bias load and temperature changes. Consistency and good interchangeability. After multiple sensors are connected in parallel to form a scale, software methods can be used to achieve linearity, correction, and performance compensation, reducing system errors and simplifying on-site installation, debugging, calibration, and adjustment of the scale body;

③ Automatic fault diagnosis, error message code prompt function;

④ When the load is applied to a weighing sensor for a long time, its output often undergoes significant changes. The digital weighing sensor automatically compensates for creep through software in the internal microprocessor;

(3) Digital weighbridge without weighing display instrument to reduce the failure rate of weighbridge -- Digital calibration technology

① Automatically complete the calibration of the weighing instrument's bias load (four corners) once;

② You can modify the scale's range coefficient and zero point value as needed to ensure that the coefficient and zero point parameters of each sensor are consistent;

③ The digital weighbridge can be directly connected to the computer to display the weighing process, reducing the number of weighing faults.

Nowadays, computer hardware is extremely reliable, so the weighing system composed of it is more safe and reliable.

(4) The analog weighbridge consists of a steel structure modular weighing platform, high-precision bridge type resistance strain simulation sensor, static weighing control display instrument, sealed waterproof junction box, etc.

The main features of the analog weighbridge include a bridge type resistance strain analog sensor, excellent moisture-proof sealing, and adaptability to any harsh working environment.

(5) Intelligent instrument, multiple display functions, large capacity storage, standard serial output, and strong expansion function. Intelligent instrument: Display instruments can be selected according to needs to meet the requirements of different users. The instrument can display the date, time, vehicle number, as well as the tare, gross weight, item number, serial number of the vehicle number. It can store the vehicle number, with a tare weight of 200 vehicles and power off protection. Store 1000 weighing records and various statistical reports. Classification statistics of vehicle numbers, classification statistics of goods numbers, daily reports, and monthly reports. It can increase the accuracy by 10 times to display the current weighing. 10 unit price settings, storage, and retrieval for convenient trade settlement. Intelligent identification of battery level, automatic shutdown to protect the battery. Uninterrupted real-time clock with agreed date shutdown function. Capable of quickly printing 1 to 4 pound codes, equipped with Rs 232c serial data interface, and able to connect to large screen displays or computers& Middot; Modular weighing platform, U-shaped beam structure, good strength and interchangeability, can be equipped with a computer management system. The weighing platform structure adopts U-shaped cold bending steel assembly welding, and the overall stiffness, torsional resistance, and local stiffness of the table have been greatly improved. The design of the weighing platform is modular, standardized, and serialized, allowing for the free composition of various specifications. This series uses high-precision bridge or column type weighing sensors and weighing display instruments with rich functions and strong storage functions to form a multifunctional weighing and measuring system. The automatic weighing system for cement scales.

(7) The biggest difference between reinforced concrete weighbridges and all weighbridges, digital weighbridges, and analog weighbridges lies in the difference in the structure of the scale body. The former is a reinforced concrete structure, while the latter is an all steel structure. The instruments, junction boxes, and printer sensors used in these weighbridges (commonly known as weighbridges) are generally the same, with similar working principles and lightning protection facilities. The construction of the foundation of the weighbridge is the same, and there is no essential difference in functionality. However, the production cycle of cement scales is much longer than that of full steel structures, so if cement scales are to be used as weighbridges, it is best to negotiate with the manufacturer early to avoid delaying the time when the weighbridge is put into use. Advantages: It fundamentally solves the problems of corrosion, reduced accuracy, and shortened service life caused by rain, sunlight, acid and alkali corrosion, as well as thermal expansion and contraction of the structure during the use of all steel structure weighing scales. It has corrosion resistance, structural stability, self weight, accurate positioning, non deformation, and maintenance free. It is suitable for public weighing stations, chemical enterprises, ports and docks The introduction of weighing scales in industries such as the refrigeration industry that require high anti-corrosion functions can be divided into analog weighing scales and digital weighing scales according to the classification of sensor output signals; According to the weighing method, it is divided into static truck scale and dynamic weighbridge; According to the installation method, it can be divided into ground scale and ground scale; Divided into steel structure countertops and concrete countertops according to the scale platform structure; According to the usage environment, it can be divided into explosion-proof and non explosion-proof weighing scales; According to the degree of automation of the weighbridge, it can be divided into non automatic weighbridge and automatic weighbridge. In recent years, with the continuous improvement of enterprise management level, unmanned automatic weighing machines are becoming the development direction of future weighing machines.
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The application of weighbridge scales and truck scales can be found in our official website's application cases:Weighbridge Scale - Zhongxin is a first-class company selling weighing bridge accessories and sensors、Automobile scale - Zhongxin is a first-class company in the field of industrial weighing and accessories。