How the automatic multihead weigher picks the weight sensor

Author: Smartweigh–Multihead Weighter

At this stage, whether it is for the inspection of food, daily chemical products, pharmaceutical industry, petrochemical industry, or the inspection of rechargeable batteries and auto parts, the company uses multihead weigher as an important way to test the quality and total number of products. It has been increasingly used in many manufacturing industries. As productivity continues to increase, the reliability of the entire manufacturing process is challenged. How does the company ensure that the high-speed packaging line still achieves high-precision inspection at low-speed? Can the company fully automatically detect the production and processing deviation of fine parts on the conveyor under the vibration standard of the stamping machine? Can the company dynamically weigh the precise value of the fully automatic loading carbon ring and the small deviation of the net weight of the lithium battery electrolyte on the automatic production line of high-speed rechargeable batteries? Consistency and credibility are new topics that manufacturing companies care about, and the improvement of online monitoring of new technology applications is the best way to deal with this problem.

The development trend of automatic multihead weigher Historical time: According to the scientific research on historical time and the exploration of many ways, automatic multihead weigher (also known as screening scale, sorting machine or automatic sorting electronics) Guangzhou Lanser Automation Technology The LLC releases a series of sensors that conform to the multihead weigher on the market. Types of weight sensors on multihead weighers: At present, there are mainly two types of weight sensors used in automatic multihead weighers: strain resistance sensors and electromagnetic induction compensation sensors. The factors that compromise the dynamic precision of the multihead weigher do not depend on which type of sensor is used.

Even if the precision of the weight sensor is very high, if it is impossible to get rid of the vibration of the motor of the machine itself, the vibration of the scale and the basic vibration of the product, the expected dynamic precision cannot be achieved, even if the precision is very high. balance sensor. In addition to the damping vibration hazards of the equipment itself, the factors that endanger the dynamic weighing accuracy of the multihead weigher, the product length, the internal shaking of the product and its environmental factors are all harmful to the accuracy. Under the same weighing platform length standard, the longer the product length and the less weighing time, the worse the precision will be. The way to get rid of it is to extend the distance of the weighing section.

When the multihead weigher uses an electromagnetic induction compensation weight sensor (that is, the sensor method selected by the electronic analytical balance), if the repeatability of the multihead weigher is poor, high precision and low repeatability will occur. The end result is poor dynamic precision, and it is difficult to adjust dynamic weighing precision according to the main parameters. When the multihead weigher uses a strain gage resistor sensor (that is, the sensor of choice for industrial production electronics, automatic quantitative analysis scales, and seasoning controls, etc.), if the repeatability of the multihead weigher is high, low precision and High repeatability condition.

However, in the end, the dynamic precision of the multihead weigher can be made high quality by adjusting the dynamic and static data scale index. The key component of the multihead weigher is the weight sensor. At this stage, two types of weight sensors are generally used internationally: strain resistance sensors and electromagnetic induction compensation sensors.

The principle of electromagnetic induction compensation sensor: the principle of electromagnetic induction compensation weight sensor is electric transformation. In order to balance the software of this type of system, some auxiliary equipment must be added, such as a weighing plate where the object to be measured must be placed and a displacement sensor to identify the transition of the transmission line in the electromagnetic field. In addition, a current flow controller and an accurate measurement control loop for accurately measuring the current flow are also required.

When no load is applied, the transmission line just passes through a certain amount of current controlled by the current controller, so that the two needles of the indicator at the same level remain motionless, and the system software achieves a balanced state. At this time, the amount of current marked on the detection instrument matches the zero position, that is, the zero point of the balance scale. The electromagnetic induction compensation weight sensor is widely used in the electronic analytical balance in the laboratory, and its characteristic is the high precision of the sensor, generally 0.001%.

Fully considering the hazards of the belt conveyor on the weighing table, the weighing accuracy of the overall static data of the weighing table is generally 0.01% of the measurement range. The whole process of electromagnetic induction must be balanced inside the sensor, the weighing time is long, and the dynamic response speed is relatively slow. Therefore, the multihead weigher using the electromagnetic induction compensation type weight sensor cannot improve the dynamic accuracy of 400 pieces per minute and the positive and negative error of 300mg.

The strain resistance resistor weight sensor is made of four resistance strain gauges attached to the metal aluminum or stainless steel polyurethane elastomer to form a Wyeth connection power bridge. When the sensor is subjected to force, its appearance changes. In this way, the resistance values ​​of the four resistance strain gauges pasted on the inductor are also changed relatively.

According to the accurate measurement of the power supply circuit according to the power supply bridge, the change of the resistance value can be accurately measured and the magnitude of the force can be calculated. The strain resistance weight sensor is widely used in industrial production electronics and unique weighing operations in various industrial production sites. %. Fully considering the hazards of the belt conveyor on the weighing platform, the weighing accuracy of the overall static data of the weighing platform is generally 0.03% of the measurement range.

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