Overview

 

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

 

Functional principle

 

Weighing equipment is an electronic weighing device that integrates modern sensor technology, electronic technology and computer technology to meet and solve the "fast, accurate, continuous, automatic" weighing requirements proposed in real life, and effectively eliminate 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 and production and sales, effectively saving resources of enterprises and merchants, and reducing expenses, has won praise and trust from enterprises and merchants.

 

Application classification

 

Weighing equipment is widely used in industrial, agricultural, commercial, scientific research, medical and health departments, weighing equipment is customarily called scales. The weighing device measures the mass of the object using the force balance principle (Hook's Law). The deformation balance (Hooke's law) determines the mass of the measured object according to the elastic shape variable caused by the weight of the measured object. The shape variable changes with the change of gravity acceleration; the leverage balance is based on the weight of the calibration weight and the weight of the measured object. Balance on the lever to determine the mass of the test object. The balance of the lever is independent of the change in gravitational acceleration, but when the gravitational acceleration is equal to zero, the weighing will fail.

 

According to the requirements of the symmetrical heavy equipment of each enterprise merchant, the principle structure, function, use, precision and placement position of the symmetrical heavy equipment are also different. Therefore, the difference between the symmetrical heavy equipment is systematically divided.

 

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

 

B. According to the function, the weighing equipment is divided into counting scale, pricing scale, weighing scale

 

C, according to the use of weighing equipment into industrial scales, commercial scales, special scales

 

D, the weighing equipment is divided into precision

 

Class I: Special balance Precision ≥1/100,000 Reference weighing equipment

 

Class II: High-precision balance 1/100,000 ≤ precision <1/100,000 Precision weighing equipment

 

Class III: Medium precision balance 1/1000 ≤ precision <1/1 million Industrial. Commercial weighing equipment

 

Class IV: Ordinary scale 1/100≤Precision<1/1000 Thick weighing equipment

 

Mine-specific track scale

 

E. According to the installation position, the weighing equipment is divided into a series of weighing equipment such as desktop scales, platform scales, floor scales, loader scales, driving scales, crane scales and track scales.

 

Structure and composition

 

The weighing equipment is mainly composed of three parts: the load-bearing system, the force transmission conversion system (ie sensor) and the indication system (display).

 

Weight bearing system

 

The shape of the load-bearing system often depends on its use, according to the shape of the weighing object combined with shortening

 

Loader electronic scale

 

Designed with features such as heavy time and reduced operational complexity. For example, platform scales and floor scales are generally equipped with flat load-bearing mechanisms; crane scales and driving scales are generally equipped with load-bearing structures; some special specialized weighing equipments are equipped with special load-bearing mechanisms. In addition, the form of the load-bearing mechanism is also the track of the railway scale, the conveyor belt of the belt scale, the body of the loader scale, and the like. The structure of the load-bearing system is different, but the function is consistent.

 

sensor

 

The force transfer conversion system (ie, the sensor) is the key component that determines the metering performance of the weighing equipment. The common force transfer system lever force transmission system and deformation force transmission system are divided into photoelectric type, hydraulic type and electromagnetic type according to the conversion method. 8, capacitive, magnetic pole deformation, vibration, gyro ceremony, resistance strain type and other 8 categories.

Electronic hook scale

 

The lever force transmission system is mainly composed of a load-bearing lever, a force transmission lever, a bracket part and a coupling part such as a knife, a knife bearing, a hook, a lifting ring and the like.

 

In the deformation force transmission system, the spring is the earliest deformation force transmission mechanism. Spring scales can be weighed from 1 milligram to tens of tons. Springs are available with quartz wire springs, flat springs, coil springs and disc springs. The spring scale is greatly affected by factors such as geographical location and temperature, and the measurement accuracy is low. In order to obtain higher accuracy, various load cells have been developed, such as resistance strain type, capacitive type, pressure magnetic type and vibrating wire type load cell, etc., and the resistance strain type sensor is the most widely used.