Automatic control of the checkweigher process
1. Overview of Some products packaged in bags, bottles, cans, etc., need to be loaded first, and then checked on the checkweigher machine to ensure that the net weight of the product in the product package conforms to the product weight marked on the product package. However, due to changes in the mechanical characteristics of the loader, changes in material characteristics, etc., the weight of the goods loaded into each packaging container may change, making the goods overweight or underweight. Excessive overweight will affect the efficiency of the enterprise, while underweight may be complained by users and affect the credibility of the enterprise. If the product is loaded in liquid or powder or small granular form during the loading process of the package, the loading process can also be automatically controlled by the real-time measurement value of the checkweigher to ensure that the product is marked on the package. Weight without being too overweight. 2 When the automatic control loader of the checkweigher performs automatic control according to the feedback signal, the detection data of the checkweigher is compared with the pre-set target weight value of commodity weighing, and a feedback signal is determined to be sent to the controller and passed through the actuator. Adjust the loader charge to reduce product weight errors and variations in product charge due to drift in the loader charge (as shown in Figure 1). Since it takes a period of time for the goods loaded by the loader to arrive at the checkweigher, the weighing indicator needs to delay the control operation for the next adjustment of the loading amount of the loader. 2.1 Basic Types of Charge Control There are two basic types of charge controls that can be run on a checkweigher and they are: Continuous Charge Control: This continuous control system produces a control signal whose output is proportional to each package The difference between the weight and the target weight set by the user, an adjustment system with an extremely fast response time. Average loading control: The average loading control needs to set a period of “duration” first, which can be determined by the number of packages passed within this time. time' is 10s. The control system calculates the average weight value of 20 packages in a 10s duration, compares it with the difference between the target weight set by the user, and generates a correction signal to adjust the punching amount of the charging head. This system is mostly used for multi-head loading machines. 2.2 Types of Feedback Control Signals of the Loader There are three types of feedback control signals sent to the feeder: Analog modulation: Analog control signals, such as voltage or current loop control signals. Pulse frequency: The control signal is a series of output pulse numbers based on the direction and amplitude of the weight deviation. Pulse time: The control signal is a single pulse that changes the duration of the output pulse based on the direction and amplitude of the weight deviation. 2.3 Feedback Control System of Double Feedback When the packaging accuracy is required to be high and the tare weight change of commodity packaging needs to be considered, the double checkweigher feedback control system as shown in Figure 2 can be used to control the loading amount of the loading machine. , the weight of the empty bottle is detected by the checkweigher 1, and the signal is transmitted to the weighing display of the checkweigher 2 to detect the net weight of the material. The detection data of the loading net weight is input to the loader as a feedback signal, so as to realize the real-time control of the loading net weight.
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