Weighing equipment

Overview

Weighing equipment usually refers to the weighing equipment for large objects used in industry or trade. It refers to the supporting use of modern electronic technologies such as program control, group control, teleprinting records, screen display, etc., which will make the weighing equipment function Complete and more efficient. The weighing equipment is mainly composed of a load-bearing system (such as a weighing pan, a weighing body), a force transmission system (such as a lever force transmission system, a sensor), and an indication system (such as a dial, an electronic display instrument). In today's combination of weighing, production, and sales, weighing equipment has received great attention, and its demand for weighing equipment has also increased.

Functional principle

Weighing equipment is an electronic weighing device that integrates modern sensor technology, electronic technology and computer technology in order to meet and solve the "fast, accurate, continuous, automatic" weighing requirements in real life, while effectively eliminating human error To make it more in line with the application requirements of legal metrology management and industrial production process control. The perfect combination of weighing, production and sales effectively saves the resources of enterprises and merchants, reduces expenses and has won praise and trust from enterprises and merchants.

Application classification

Weighing equipment is widely used in industry, agriculture, commerce, scientific research, medical and health departments. Weighing equipment is conventionally called scales. Weighing equipment uses the principle of deformation balance of force (Hooke's law) to determine the mass of an object. Deformation balance (Hooke's law) determines the mass of the test object based on the elastic deformation of the test object. The deformation variable changes with the acceleration of gravity; the balance of the lever is based on the weight of the calibration weight and the weight of the test object. Balance on the lever to determine the mass of the test object. Lever balance has nothing to do with the change in gravity acceleration, but when gravity acceleration is equal to zero, weighing will fail.

According to the requirements of various enterprises and merchants for symmetrical heavy equipment, the principle structure, function, use, accuracy, and placement of symmetrical heavy equipment must be different. Therefore, the differences in these aspects of the symmetrical heavy equipment are systematically divided.

A. According to the principle structure, the weighing equipment is divided into electronic scales, mechanical scales, and electromechanical combined scales.

B. Weighing equipment is divided into counting scale, pricing scale and weighing scale according to function.

C. Weighing equipment is divided into industrial scales, commercial scales and special scales according to purpose

D. Divide the weighing equipment according to accuracy

Class I: Special Balance Precision ≥1 / 100,000 Reference Weighing Equipment

Class II: High-precision balances 1 / 110,000≤precision<1/100000 Precision weighing equipment

Class III: Medium-precision balance 1 / 1000≤precision<1 / 10,000 industrial and commercial weighing equipment

Class IV: Ordinary scale 1 / 100≤precision<1/1000 coarse weighing equipment

Mine-specific rail scale

E. According to the installation position, the weighing equipment is divided into a series of weighing equipment such as desktop scales, bench scales, floor scales, loader scales, traveling scales, crane scales, orbital scales.

Structure and composition

Weighing equipment is mainly composed of three parts: load-bearing system, force transfer system (sensor), and indicator system (display).

Load-bearing system

The shape of the load-bearing system often depends on its use.

Loader electronic scale

Designed with features such as heavy time and reduced operation burden. For example, platform scales and floor scales are generally equipped with flat load-bearing mechanisms; crane scales and crane scales are generally equipped with structural load-bearing structures; some special and special weighing equipment are equipped with special load-bearing mechanisms. In addition, the form of the load bearing mechanism includes the track of the track scale, the conveyor belt of the belt scale, and the bucket of the loader scale. Although the structure of the load-bearing system is different, the functions are the same.

sensor

The force transfer system (sensor) is a key component that determines the measurement performance of weighing equipment. The common force transfer system is the lever force transfer system and the deformation force transfer system. According to the conversion method, it is divided into photoelectric, hydraulic, and electromagnetic force , Capacitance type, magnetic pole change form, vibration type, gyro ceremony, resistance strain type and other 8 categories.

Electronic hook scale

The lever force transmission system is mainly composed of load-bearing levers, force-transmitting levers, bracket parts and coupling parts such as knives, knife bearings, hooks, rings and the like.

In the deformation force transmission system, spring is the earliest deformation force transmission mechanism. Spring scales can weigh from 1 milligram to tens of tons. The springs used are quartz wire springs, coil springs, coil springs and coil springs. The spring scale is greatly affected by factors such as geographical location and temperature, and the accuracy of measurement is low. In order to obtain higher accuracy, various load cells have been developed, such as resistance strain sensors, capacitive sensors, piezomagnetic sensors, and vibrating wire sensors. The resistance strain sensors are the most widely used.

monitor

The indicator system of the weighing equipment is a weighing display, which has two types of digital display and analog scale display. Weighing display types: 1. Electronic scale 81. LCD (liquid crystal display): no plug-in, power saving, with backlight; 2. LED: no plug-in, power consumption, very bright; 3. tube: plug-in, power consumption Electricity, very high. VFDK / B (key) type: 1. Membrane key: contact type; 2. Mechanical key: Grouped by many separate keys

Scope of application

For many years, China has mainly used mechanical weighing equipment. In the 1980s, it began to expand the use of electronic weighing equipment and the development of large-scale automatic weighing equipment. China can now independently design and manufacture high-precision, Fast, accurate measurement of various electronic weighing equipment. Due to the rapid development of science and technology and the improvement of application levels, the digitalization, integration, networking, and intelligence of weighing equipment products will become the development direction and focus of the world's weighing equipment industry.

Weighing equipment is used in chemical, commodity concrete, logistics, ports, docks, factories and mines, businesses, railways and highways, etc.

scs series truck scale

The main weighing equipment for weighing is that the truck scales that were common before the 1980s are generally mechanical truck scales that use the pure mechanical structure of the lever principle, also known as mechanical floor scales. Modern electronic weighing equipment adopts a newly designed steel structure carrier, which is simple, light and convenient to carry. The electronic weighing equipment can be directly laid on the concrete floor and equipped with a movable slope (optional) to make full use of space. Four high-precision shear beam load cells and intelligent weighing display instruments form a weighing system.

Precautions for use

The first is to warm up in advance. Weighing equipment usually requires preheating before use, and the preheating time of weighing equipment is often different. Generally speaking, the higher the accuracy level of the weighing equipment, the longer the preheating time is required. Preheating is required in the instruction manual. If necessary, the preheating time can be extended (usually the lower the ambient temperature, the longer the preheating time). In fact, many users use the weighing equipment out of the box, which does not guarantee the weighing performance of the weighing equipment. Therefore, the preheating of the weighing equipment is the key to accuracy.

The second is environmental conditions. Environmental conditions are also an important factor affecting the weighing performance of weighing equipment. If no special temperature limit is specified in the operating instructions of the weighing equipment, the weighing equipment should work normally at a temperature of -10 ° C ~ 40 ° C; if a special temperature limit is specified, the weighing equipment should be at the specified temperature Working under conditions; weighing equipment also requires environmental humidity, such as the relative humidity of class Ⅰ balance is not greater than 80%.

The third is the horizontal state. Generally, high-precision weighing equipments are provided with leveling devices and levelers. In use, the horizontal state of the weighing equipment should be checked frequently. In fact, some users often overlook the horizontal state inspection of weighing equipment (weighing equipment often causes unevenness or unevenness of the corners due to movement or other reasons). This is also the main reason for the inaccuracy of weighing equipment data.

The fourth is calibration at any time. Some people believe that the weighing equipment is accurate within the validity period after the periodic verification, and the importance of calibration is often ignored or even not calibrated. As everyone knows, due to changes in environmental conditions, human factors and other factors, the weighing performance of the weighing equipment often changes slightly, which requires us to calibrate it in daily use. So, how should we perform the calibration? The weighing equipment should be calibrated every day or before each use, and the frequency of calibration can be increased if necessary. The weight used for calibration is theoretically the higher the level, the better. Generally, the weight error should be no more than 1/3 of the maximum allowable error of the balance, and it should be sent to the quality supervision department for regular inspection. It should be sent to the quality supervision department for testing in time to avoid causing losses and harming consumers.

Industry prospects

There are many applications of weighing equipment in control, batching, and measurement. The system accuracy of symmetrical weighing equipment is often very high. Weighing equipment is a traditional industry and an important basic industry with a long history of development. After the reform and opening up, China's weighing equipment industry has developed rapidly. The management system, industry structure, product structure, technical level and position of the weighing equipment industry in the national economy have changed dramatically. Equipment companies have made considerable progress. Dacheng Weighing Equipment Company and other early-starting companies have played an indelible role in the progress of China's weighing equipment.

At present, China's application of advanced weighing equipment with high technological content is still at the stage of relying on imports to resolve supply. Therefore, in the field of weighing equipment products with high technological content, China's weighing equipment manufacturing enterprises have huge development space, Dacheng Weighing equipment hopes that more people can believe in domestic production and support our national industry. In addition, with the continuous growth of domestic consumption and the industrial economy, domestic demand for weighing equipment products will further increase, and it will better serve merchants and corporate users.

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Browse: Author: Source: Time:2019-12-21 21:37:15 Print