How to choose weight sensor for automatic checkweigher
At this stage, whether it is for the inspection of food, daily chemical products, the pharmaceutical industry, and the petrochemical industry, or for the inspection of rechargeable batteries and auto parts, the company uses checkweighers as an important way to test the quality and total number of products. Electronic weighing instruments have been increasingly used in many manufacturing industries. With the continuous improvement of productivity, the reliability of the entire manufacturing process has been challenged. How does the company ensure that the high-speed packaging line can still achieve high-precision inspections at low speeds? Can the company automatically detect the production and processing deviations of minute 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 of the carbon ring and the small deviation of the net weight of the lithium battery electrolyte can on the Gaosu rechargeable battery automatic production line? Consistency and credibility are new topics that manufacturers are concerned about, and online monitoring of the application of new technologies is the best way to deal with this problem. The development trend of automatic checkweigher Historical time: According to the scientific research of historical time and the exploration of many methods, automatic checkweigher (also known as screening scale, sorting machine or automatic sorting electronic weighing instrument) Guangzhou Lan SER Automation Technology Co., Ltd. released a series of sensors suitable for checkweighers on the sales market. Types of weight sensors on checkweighers: Today, there are two key types of weight sensors used in automatic checkweighers: strain force resistor sensors and electromagnetic induction compensation sensors. The elements that endanger the dynamic precision of the checkweigher do not depend on which type of sensor is used. Even if the precision of the weight sensor is very high, if it is not possible to get rid of the motor vibration of the machinery and equipment itself, the vibration of the scale on the product, and the basic vibration, the expected dynamic precision cannot be achieved, even if the precision is very high. Balance scale sensor. In addition to the damping vibration hazards of the equipment itself, the factors that endanger the dynamic weighing precision of the checkweigher, the length of the product, the internal shaking of the product, and the environmental factors are all harmful to the precision. Under the same weighing platform length standard, the longer the product length and the shorter the weighing time, the worse the accuracy will be. The way to get rid of is to extend the weighing distance. When the checkweigher machine adopts an electromagnetic induction compensation weight sensor (that is, the sensor method selected by the electronic analytical balance), if the repeatability of the checkweigher is poor, there will be high precision and low repeatability conditions. The final result is that the dynamic precision is not good, and it is difficult to adjust the dynamic weighing precision according to the main parameters. When the checkweigher adopts a strain resistance sensor (ie, the sensor selected for industrial production electronic weighing instruments, automatic quantitative analysis scales, and seasoning control), if the repeatability of the checkweigher is high, it will be low. Precision and high repeatability conditions. However, in the end, the dynamic precision of the checkweigher can be made to be very high-quality according to the adjustment dynamics and static data proportional index. The key component of the checkweigher is the weight sensor. At this stage, two types of weight sensors are generally used internationally: strain force resistor sensors and electromagnetic induction compensation sensors. The principle of the electromagnetic induction compensation sensor: the principle of the electromagnetic induction compensation weight sensor is the basic principle of electric transformation: when the amount of current is based on the transmission line between the two sides of the electromagnet, the effect of the magnetic field causes the magnetic field force. In order to balance this type of system software, some auxiliary equipment must be added, such as a scale that must place the object to be measured and a displacement sensor that distinguishes 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 necessary. When no load is applied, a certain amount of electric current controlled by the electric current controller passes through the transmission line, so that the two hands of the indicator at the same level are kept intact, and the system software is in a balanced state. At this time, the amount of current marked on the detection instrument matches the zero point, that is, the zero point of the balance scale. The electromagnetic induction compensation weight sensor is widely used in the electronic analysis balance in the laboratory. Its characteristic is the high accuracy of the sensor, which is generally 0.001%. Fully consider the hazards of the belt conveyor on the weighing platform. Generally, the overall static data weighing accuracy of the weighing platform is 0.01% of the measurement range. The whole process of electromagnetic induction must be balanced inside the sensor, the weighing time is relatively long, and the dynamic response speed is relatively slow. Therefore, the checkweigher using the electromagnetic induction compensation type weight sensor cannot improve the dynamic precision short board of 400 pieces/min and the error of positive and negative poles of 300mg. The strain force resistor weight sensor is composed of four resistance strain gauges attached to metal aluminum or stainless steel polyurethane elastomer to form a Wheatstone connection power bridge. When the sensor bears the force, its appearance changes. In that way, the resistance value of the four resistance strain gauges attached to the inductor also has a relative change, in which the resistance value of the extrusion molding is reduced, and the resistance value of the tension is increased. According to the accurate measurement of the power supply circuit by Wheatstone connected to the power bridge, the change in resistance value can be accurately measured and the magnitude of the force can be calculated. Strain force resistor weight sensors are widely used in industrial production electronic weighing instruments and unique weighing operations under various industrial production sites. Its characteristics are suitable for the extreme natural environment on the spot in industrial production, with fast dynamic response and sensor precision 0.01%. Fully consider the hazards of the belt conveyor on the weighing platform. Generally, the overall static data weighing accuracy of the weighing platform is 0.03% of the measurement range.
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