The weighing and dropping system realizes the process control of batching. According to the need of batching, various control function program modules and control subroutines are designed in the control software. It mainly includes "control system state initialization", "automatic work control", "manual work control", "automatic batching", "state test", "fault detection" and so on. The dosing control software follows the automatic control and manual control modes. In order to improve the performance of the batching control system, improve the accuracy and speed of the batching system, and ensure the reliable operation of the control system, effective measures are taken.

In the batching control field environment, the analog signal of the weighing module is transmitted by shielding and hardware filtering, and the digital signal after A/D conversion is filtered and processed by software, so that the high precision weighing value can be obtained. In the process of system batching, the control can automatically detect the failure of the switch of the weighing door and the mixing door and the failure of the feeder. It is obtained by detecting the status signal of the feedback stroke switch. When a fault or error is detected, the fault location is displayed on the CRT screen.

The mixing dosing system outputs a certain number of square wave pulses through PLC programming to control the Angle of the stepper machine and then control the dosing feed of the servo mechanism. The loop pulse distributor distributes the control pulses output by the programmable controller to the corresponding winding according to the power sequence of the stepper motor. The pulse distribution of the stepper motor controlled by PLC can be realized by software such as batching, capping, sealing, palletizing, weighing equipment and corresponding conveying.

Labeling inspection machine consists of weighing module, when the items through the load cell, the load cell records the weight of the size, so that after the analog collection of signals through the conversion needs. Digital signals processed through the microprocessor display, the current display equipment are to apply the liquid crystal display, when the collection of weight data and printing and labeling, these data through the microprocessor can be analyzed, sorted to meet the requirements of the weight of the simplest and most common is the current widely used small electronic scales.

Checkweigher can be selected does not meet the requirements of the set weight value, with the conveyor belt and reject equipment to do not meet the requirements of the weight of the production of mouth separation, to meet the requirements of the pass. Has included a lot of today's needs of the function, using the world's advanced digital weighing unit, to achieve high-speed, stable measurement. Patented scale frame structure ensures accuracy and stability. Multi-mode LCD graphic display operating system, Chinese, English and Korean operating interface, easy to learn. Powerful statistical function to record the inspection data of each shift. Adopting dismounted conveyor belt, easy to maintain automatic counting, automatic rejection of nonconforming products or alarm when encountering nonconforming products. Testing standard weight can be set, real-time display of testing weight and quantity, and display of inspection results.

After the checkweigher gets the weight signal of the product, the system will compare it with the pre-set weight range to sort the product, and the sorting type will be different according to the application, and there are mainly the following types: non-conforming products are rejected, and overweight and underweight are rejected separately, or conveyed to different places, and sorted to different weight categories according to different weight ranges.

The main control component of the belt scale is composed of CPU module, I/O module, high-speed counting module, AD/DA module and scanner module, which is responsible for the digital measurement and output control of the whole belt scale and provides the input and output signals required for external connection. Two 16-bit analog inputs and two analog output modules NI04I A/D for weight sampling, D/A for frequency control and current instantaneous flow output 4-20mA current signal. The weight signal is converted into 4-20mA current signal by the transmitter and sent to NI04I, and the speed adjustment signal after computer processing is sent to the inverter by NI04I, and the coded pulse from the speed encoder is sent to the high-speed counter and calculated by PLC to obtain the running speed of the belt.

Checkweigher generally consists of control device, classification device, conveying device and sorting roadway. The function of the control device is to recognize, receive and process the sorting signals, instruct the sorting device according to the requirements of the sorting signals, and automatically sort the commodities according to the commodity varieties, according to the commodity delivery location or according to the category of the owner. These sorting requirements can be through different ways, such as bar code scanning, color code scanning, keyboard input, weight detection, voice recognition, height detection and shape recognition, etc., input to the sorting control system, according to the sorting signals to determine a certain kind of goods should enter which sorting channel.

The belt scale is equipped with a load weighing module bridge, mounted on the longitudinal beam of the conveyor. The weighing rollers on the weighing bridge detect the weight of the material on the belt and produce an electrical output signal proportional to the belt load. The speed sensor is directly coupled to the follower pulley or large diameter rollers and provides a series of pulses, each pulse representing a unit of belt motion, at a frequency proportional to the belt speed. The weighing instrument receives the output signals from the weighing module and the speed sensor, electronically multiplies the belt motion and belt load, and produces an instantaneous flow value and a cumulative total by calculating the time. The cumulative total and the instantaneous flow are converted into selected engineering units and displayed on the accumulator respectively.