An electronic scale generally refers to an instrument equipped with an electronic device. Because of its wide variety, and involving trade settlement and protection of the interests of consumers, it has been widely concerned and valued by governments around the world and has been identified as a legal measurement instrument for state compulsory management. The electronic weighing instrument is an important means of automated weighing control and trade measurement, and plays an important role in strengthening enterprise management, strict production, trade settlement, transportation, port measurement and scientific research. The electronic weighing instrument has the characteristics of fast reaction speed, wide measuring range, wide application range, simple structure, convenient operation, long-distance signal transmission and convenient computer control. It is widely used in various fields such as coal, petroleum, chemical, electric power, light industry, metallurgy, mining, transportation, port, construction, machinery manufacturing and national defense.

First, the status quo

        The infiltration of electronic technology in the mid-1950s drove the development of the weighing instrument manufacturing industry. Since the emergence of electromechanical combined electronic weighing instruments in the early 1960s, after more than 40 years of continuous improvement and improvement, China's electronic weighing instruments have evolved from the initial electromechanical combination to the current full electronic and digital intelligent. The technical equipment and testing methods of China's electronic weighing instruments have basically reached the level of the international mid-1990s. Electronic weighing instrument manufacturing technology and application have been newly developed. The development of electronic weighing technology from static weighing to dynamic weighing: measurement methods from analog measurement to digital measurement; measurement characteristics from single-parameter measurement to multi-parameter measurement, especially for rapid weighing and dynamic weighing research and application . However, in general, the quantity and quality of China's electronic weighing products are still far behind that of industrial developed countries. The main gap is that technology and technology are not advanced enough, process equipment and test instruments are aging, development capacity is insufficient, and product varieties Less specifications, incomplete functions, poor stability and reliability.

Second, the development trend

        By analyzing the development of electronic weighing products and the demand of domestic and foreign markets in recent years, the overall development trend of electronic weighing instruments is miniaturization, modularization, integration and intelligence; its technical performance tends to be high speed, high accuracy and stability. High and high reliability; its functional trend is the “intelligence” function of weighing measurement control information and non-control information; its application performance tends to be comprehensive and combined.

Modular

        For large or large carrier structures, such as large static and dynamic electronic truck scales, modules of standard construction of several lengths have been adopted, and new varieties and specifications have been produced through split combination. Taking 3 standard modules of the same width (5, 6, 7) m as an example, a single block, two blocks, three blocks and four blocks can be combined to form 22 kinds of lengths (5-28) m. The split type body structure of the specification. Of course, in practical applications, according to the needs of users in various industries, more than 10 commonly used standard specifications can be selected. This modular split-type scale structure not only improves the versatility, interchangeability and reliability of the product, but also greatly improves production efficiency and product quality. At the same time, it also reduces costs and enhances the market competitiveness of enterprises.

2. miniaturization

        Small size, low height and light weight, ie small, thin and light. In recent years, the newly developed electronic platform scale structure fully reflects the development direction of small and light. For low-capacity electronic platform scales and electronic axle scales, a thin or thin circular load cell can be directly embedded in the blind hole of the bottom surface of the steel plate or aluminum plate and the outer diameter of the load cell to form a low-profile scale structure. The number and position of the load cells are determined by the rated load and mechanical requirements of the scale. The steel plate or aluminum plate is the table top of the scale body. The load cell is both a sensing element and a bearing fulcrum, which greatly reduces the structure of the scale body and reduces the active connection, which not only reduces the cost, but also improves the stability and reliability. Sex. For medium or large-capacity electronic platform scales and electronic ground scales, thin-walled steels with square or rectangular closed sections have been used, and parallel rows of queues are welded into a single bamboo-plated structure scale body, and four load cells are respectively Installed in the incision at the two ends of the two thin-walled steels outside, the fixed support installed on the load-bearing point of the load cell is the bearing fulcrum of the scale body, which reduces the bearing force transmission mechanism and saves the height of the scale body. A very promising scale body structure. For large electronic platform scales, the finite element method can be used for the calculation of equal strength and stiffness, and the profiles with high bending rigidity and light corrugated sandwich steel plates are used.

3. Intelligent

        The weighing display controller of the electronic weighing instrument is combined with an electronic computer to increase the function of the weighing display controller by using the intelligence of the electronic computer. On the basis of the original functions, the electronic weighing instrument can add functions such as reasoning, judgment, self-diagnosis, self-adaptation and self-organization. This is the electronic weighing instrument and the intelligent weighing display control which adopts the microcomputerized weighing display controller on the market today. The fundamental difference between the electronic weighing instrument.

4. Integration

        For some types and structures of electronic scales, such as small electronic platform scales, special scales, portable static and dynamic electronic axle scales, static and dynamic electronic rail scales, etc., can be realized scale body and load cell, rail and load cell, track scale Integration of body and railway lines.

        For example, the portable static and dynamic electronic axle scale integrated with the scale body and the load cell is made of hard aluminum alloy thick plate. The structural principle is an aluminum alloy plate strengthened by solution heat treatment, or four cantilever beam type load cells are respectively formed by drilling and milling grooves at four corners; or a plurality of symmetric blind holes are milled on the bottom surface of the aluminum alloy plate. An integral shear beam type load cell is formed with the blind groove. This makes the scale body and the load cell combined into one, that is, the aluminum alloy plate is both a scale body surface and a large plate type load cell. For example, the 10T portable dynamic electronic axle scale of the latter structure has a size of 720 mm × 550 mm × 32 mm and a weight of about 23 kg.

5. Combination

        In the industrial weighing measurement process or process flow, many weighing measurement systems also require composability, that is, the measurement range can be arbitrarily set; the hardware can make some adjustments according to certain working conditions and environment, and the hardware function is Software development; software can be modified and expanded according to certain procedures; input and output data and instructions can use different languages and barcodes, and can communicate with external control and data processing equipment.

6. Comprehensive

        The development law of electronic weighing technology is to continuously strengthen basic research and expand application, expand new technology fields, penetrate into adjacent disciplines and industries, and integrate various technologies to solve problems such as weighing measurement, automatic control and information processing. For example, in the flow metering profession, if a standard large flow measuring system is constructed according to conventional theories and methods, the price is quite expensive. If the weighing method, that is, the mass flow method, is used, the measurement of the large flow rate can be solved as long as the weight and time are accurately measured. For some commercial electronic pricing scales, it is far from enough to only weigh, price, display, and print. Modern commercial systems also require it to provide a variety of sales information, and tightly combine weighing and management automation. Heavy, pricing, storage, sales management integration, to achieve management automation. This requires electronic pricing scales to be networked with electronic computers, and the weighing system and computer system form a complete integrated control system.