Electronic weighing instrument technical features:
Characteristics 1. Competitiveness and sustainable development are the driving force of enterprise life.
Does the survival and development of an enterprise depend on price or product innovation? The chairman of the national weighing instrument and the chairman of METTLER TOLEDO Weighing Co., Ltd. pointed out that product innovation is a prerequisite for improving the competitiveness of enterprises. The source of product innovation is profit. In product innovation, the value added is the product. design.
Feature 2, digital intelligent weighing sensor
Since the advent of the resistance strain gauge load cell in the 1940s, it has been used in the production of electronic scales by the weighing instrument industry and plays a key role in electronic weighing. However, due to the structure of the load cell, the metal material of the elastic component, the machining and heat treatment process, the resistance strain gauge and the strain adhesive, the manufacturing process, the circuit compensation and adjustment, the protection and sealing, and the artificial aging experiment, etc., The quality index in terms of accuracy, stability and reliability is difficult to reach the level of industrial developed countries. Since the output is a voltage millivolt signal, such a sensor is often called an analog sensor. Features three, digital weighing system
The digital weighing system is a new concept of weighing technology in the 21st century. It consists of digital sensors and digital junction boxes. The situation of digital sensors has been introduced before. Now we will focus on the digital junction box.
The digital junction box is the Chinese name of the English DigitalJ-Box. It is the "J-BOX" that uses the analog sensor - the name of the junction box. The junction box of the analog sensor is the device that actually acts as a wire. In addition to the display function, the digital junction box generally includes the basic functions of the weighing display, amplification, digital-to-analog conversion and data transmission. Therefore, from a formal point of view, the digital junction box can also be used as a weighing display without a display. In addition, some digital junction boxes are also equipped with a display of weighing values. Therefore, there is no clear boundary between the digital junction box and the weighing display. However, compared to the weighing controller used in the industry, the digital junction box has only a communication interface and no input and output of control signals. Connect to a dedicated display or computer only via the communication interface RS485 or RS232. There are also digital junction boxes that can be connected to Fieldbus, such as the PR1720 from gwt. However, the appearance of digital junction boxes and digital sensors, although apparently not much different from the past analog structures, actually has completely different advances in concept.
The main function of the current digital weighing system is that it can digitally compensate the sensor through the microelectronic device, which makes us focus on the stability of the sensor manufacturing. Because digital compensation is wider, more flexible, and more accurate than analog compensation. Second, the digital sensor and digital junction box allow each sensor to have its own address, and the corresponding unprocessed raw weighing signal can be detected, enabling real-time monitoring and diagnosis of the symmetric heavy system. Third, according to the above characteristics, the digital system can be used to complete the weightless calibration of the static scale. This function has been recognized abroad, and there are no manual calibration instructions in the operation manual of most word junction boxes. The fourth use of the weightless calibration technology can save a lot of manpower, material resources and time.
The challenges faced by China Weighing Technology:
Challenge 1. We must innovate in new product design and development, and expand the function of old products. At the same time, we must pay attention to the protection of intellectual property rights, create a good environment for product innovation, and conduct fair competition.
Challenge 2, due to the principle of analog load cell resistance strain conversion determines its inherent output analog signal is small, short output distance, poor anti-interference ability, inconvenient installation and adjustment, etc., as early as the 1980s, people in the sensor housing Built-in amplification and A/D conversion circuit, namely analog sensor + digital transmission (amplification and A/D circuit), constitutes * generation "digital load cell", overcomes the signal small, transmission distance of analog load cell Short, shortcomings such as poor anti-interference ability. However, since the various indicators of the sensor are determined by their own manufacturing, compensation and adjustment processes, they have not broken through the original functions. Currently, the use of such sensors is relatively common.
Challenge 3, the digital weighing system has been recognized abroad, and it has been used for nearly ten years. Its many potential advantages have not been fully utilized. Currently, it is used in batching scales, quantitative scales/packaging scales, and large scales in metallurgy and steel industries. The use of no-weight code has shown that the analog digital display can not be completed by the weighing instrument. Unfortunately, in China, the digital weighing system is recognized and used in addition to the eccentric load of the truck scale. Less use and recognition.
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