The operation spiral Weighing system is a device that integrates feeding and measurement functions and can achieve continuous dynamic feeding and weighing of granular materials. The spiral scale is an integrated equipment that combines feeding and conveying, weighing and quantitative feeding control based on the working principle of a constant-speed quantitative feeding scale. It is a fully integrated, continuous dynamic feeding and weighing equipment with mechanical and electrical integration. The spiral scale mainly consists of a pre-feed feeding spiral (which can also use a fan wheel Feeding machine or other pre-feed equipment), a weighing spiral (or a measurement spiral), a weighing module, a weighing instrument, a frequency converter, and an electrical control cabinet. The feeding spiral regulates the screw rotation speed through the frequency converter to control the feeding amount, so that the measurement spiral reaches the instantaneous flow rate set by the system. When the measurement spiral runs at a constant speed, the instantaneous material load in the screw tube is measured by the weighing sensor at the measuring point, and the material gravity is converted into a proportional electrical signal and input to the controller. The controller processes the signal, performs calculations, displays the flow rate, and automatically adjusts and controls the material flow according to the set parameters. 

The spiral weighing system is mainly applicable to powder coloration functions and functional particle batching, injection molding, extrusion, plastic molding and other industries. It is usually used for batch mixing of two or more ester granular raw materials in proportion, and through program control, makes the batch mixing perform continuous actions, thereby achieving the effect of uniform mixing according to the mixing ratio. The weighing system uses the human-machine interface to input the corresponding ratio parameters, and transmits the signals of each weighing scale to the weighing instrument through the weighing sensor. Then, the signals are converted by the weighing instrument and connected to the central controller. The central controller, combined with the set formula, controls the feeding time and amount of each material based on the real-time data of each weighing. When all raw materials are weighed, they all enter the horizontal mixer, and after thorough mixing, they are introduced into the main screw through vacuum suction machine or gravity. This Batching system can weigh up to 8 types of granular raw materials. The batch mixing ratio error (depending on the size of the set ratio) is controlled within ±0.1 - 0.5% F.S. 

The batching system is mainly responsible for all the operations of material batching. Each workstation is equipped with a weighing instrument, which mainly completes the collection and display of weight data. This instrument supports serial communication. Through this communication interface, the weight data can be quickly transmitted to the PLC to assist the PLC in completing the control of the weighing process. It mainly accomplishes formula analysis, automatic weighing control, conveying, and other auxiliary operations. Due to the powerful computing ability and response speed of the serial port, in practical use, it is equivalent to being able to simultaneously control the operation of each weighing device, which greatly enhances the real-time control of the batching process. During the weighing process, the PLC automatically controls the weighing speed according to the formula settings, uses variable frequency speed regulation, and feedback control the batching speed controller to control the feeding device. The material is fed at a given speed, and the system continuously samples and calculates the material weight to obtain the feeding speed, and compares this speed with the given speed. Based on the calculation results, the output value of the batching speed controller is adjusted, and the adjustment of the output value affects the feeding speed of the feeding device, so that the feeding speed is always controlled within the allowable range. Through such continuous sampling and adjustment, the batching instrument receives the weighing signal and speed measurement signal from the weighing body, calculates and displays the instantaneous flow rate and cumulative quantity, and sends the instantaneous flow rate as a feedback signal to the regulator as the measurement input signal. The regulator compares and operates this signal with the set value inside the machine and outputs a control signal to control the frequency output of the frequency converter. The frequency converter provides a set of voltage and frequency variable power supply for the batching motor, and the motor speed changes with the change of the power supply frequency output of this power supply, thereby further controlling the feeding flow of this type of material. Finally, the instantaneous feeding flow rate and the cumulative quantity are maintained within the range required by the user. 

According to the recipe, start the three weighing hoppers one by one for weighing. After the weighing is completed, pour them into the mixer (the mixer must be turned off). After the stirring is finished, perform pre-mixing. Once the mixing is completed, the material is poured into the finished product storage through the screw Feeder and the batching machine. The control method of the frequency converter of the screw feeder: adjust the frequency of the frequency converter according to the difference in measurement to adjust the feeding speed of the frequency converter. Set the target value and preset point for each material. The target value is the weighing value of the material, and the preset point is the coarse-fine switching value during weighing. During the weighing process, start the weighing instrument to begin the coarse weighing. At this time, set the frequency converter to a relatively high speed; after reaching the preset point, switch the frequency converter speed to a lower speed, that is, to perform fine feeding; after reaching the target value, stop the feeding of the frequency converter and the weighing of the instrument. The batching process is mainly completed by the weighing device. The control system controls its accurate weighing according to the recipe. There is a collection hopper under each weighing device, and each collection hopper forms a ring shape and is connected and fixed to the track of the material conveying line by a pull rod. After each weighing, the weighed material is unloaded into the collection hopper, and then the cylinder of the conveying line moves once, pushing the collection hopper assembly to slide on the track. After advancing one material level, it stops running and starts the next weighing. The collection hopper is lined with the batching storage. After the collection hopper rotates around the ring for one cycle, the batching storage collects various weights of small materials required by the recipe.