The weighing of oil heating reactor is realized by the computer distributed control system itself, that is, no additional computer hardware is attached. With the control system composed of network communication, the requirement for the control software of the reactor is not only how powerful its function and how rich its content, but the demand for the user's redevelopment ability of different objects is becoming increasingly important.

The dosing system is composed of a touch screen as the HMI, a weighing meter, a temperature control meter, as well as a water filling control and a starch delivery control device. The system is also equipped with a number of pumps, shut-off valves, liquid level and material level sensors. Through the screen to monitor the deviation of the dosing process, and automatically according to the proportion of the formula to correct the back of the dosing ratio, in order to ensure the accuracy of the formula; can be realized with the user's production management system of data communication, through the parameter setting, automatically according to the production of orders to be produced to determine the control amount of the program can be automatically modify the formula can be to meet the dosage production line of the technological requirements. The batching system adopts touch screen as the human-machine interface, weighing instrument, temperature control instrument, water filling control and starch conveying control device. The system is also equipped with a number of pumps, shut-off valves, liquid level and material level sensors. Through the screen to monitor the deviation of the dosing process, and automatically according to the proportion of the formula to correct the proportion of the dosing of the back to ensure the accuracy of the formula; can be realized with the user's production management system of data communication, through the parameter setting, automatically according to the production of the order to be produced to determine the amount of control, the program can be automatically modify the formula can be to meet the dosage production line of the technological requirements. Feeding system is suitable for the site without continuous dosage requirements, can be batch dosage, batch allows the existence of a certain time interval, kettle weighing before and after the feeding of the two batch time interval of 3 ~ 5min, each batch of material from a variety of materials, materials accounted for the ratio of the requirements of the process over a period of time in a relatively fixed proportion of the composition of a single material requirements are not stringent, as long as the proportion of the composition of the material in the more batches to meet the process requirements. Requirements can be. Automatic feeding system due to material measurement, transportation, adding and other aspects of the time can be overlapped, in the control process can be used in parallel, in order to save feeding time, improve feeding speed. Various materials are stored in different silos, silo feeding is generally used in the form of electric vibration feeding, screw feeding or gate feeding. Measuring silo and equipped with pressure or weighing module for force and power conversion, the signal is amplified by the secondary instrumentation processing access to PLC or DCS to complete the measurement. In some applications with wide time requirements, a measuring trolley can be used for uniform measurement, measuring trolley running along the track, positioned in turn to the bin under the proportional material dosage, the dosage of various materials using the subtraction method of calculation. There is also a single fixed measuring bin way, the bins in a ring-like distribution around a measuring bin, the measurement of the material also uses the subtraction method, the material from the chute or conveyor in order to proportionally add to the measuring bin. The materials after dosing and metering are assembled, generally forming a layer or segment distribution, and then conveyed to the receiving port by the conveying equipment (such as screws or trolleys) to enter the next process, i.e., completing a batch of material dosing.

Weighing system with PLC as the control core, including the actuator, voice alarm, weighing instrument system and other parts, mainly control the elevator, classifier, crusher, feeder, screw, valve and other components. The operator station and engineer station are set up in the central control room and connected to the general control room for system monitoring and management of the whole plant. The weighing system is divided into operator stations and engineer stations, and is connected via Ethernet. The operator station is the same as the engineer station, with some limited functions.

The automatic feeding system realizes a historical record of all measurement points on the basis of real-time trends. Once you need to trace the past data information, open the historical trend page, click the right mouse button on the blank space below, and in the pop-up dialog box, you can select any curve you want. Through the "Set Parameters" button on the Historical Trend page, the curve can be displayed according to the time period specified by the user. Meanwhile, the events occurred during the operation can be displayed in real time and queried in the history alarm page, the query content includes: time, date and time of alarm occurrence, alarm limit value, alarm recovery time, operation user, alarm variable name, etc.

After the batching system enters the feeder from the bin, the weighing signal is processed by the controller to control the vibration feeder to drop the material at a certain rate. When the set value is reached, the feeding stops. Confirm that when the charging position is specified, and confirm that there is no material in the silo, the charging is opened according to the operator's instruction, and the material enters the charging silo; When all the measured materials enter the feeding bin, and confirm that the door of the measuring feed bin is closed, add the next batch of materials according to the operator's instruction, and start the walking motor of the feeding bin according to the operator's instruction or automatic program when starting, to complete the batching process.

Batching system has convenient and flexible Chinese operation interface, real-time data acquisition, display (e.g. weighing) and processing; control operation and control output; equipment and status monitoring; alarm monitoring and processing; data communication with DCS system; historical data management; log record; process flow screen generation and display and dynamic screen display of tank operation; initialization of batching and dosage process; online calculation and online modification; self-diagnosis and self-recovery of batching; database maintenance; report printing; batching function expansion; communication interface with management level, etc. Calculation, online modification; dosage self-diagnosis and self-recovery; database maintenance; report printing; expandability of dosage functions; communication interface with management level.

Automatic dosage system will weigh the hopper and the feeding mechanism as the whole scale body, through the weighing instrument or the upper computer non-stop weight signal sampling on the scale body, calculate the weight in the unit of time as the ratio of the instantaneous flow rate of the weight, and then through a variety of hardware and software filtering technology, resulting in the control object can be used as the "actual flow rate". Then FC through the PID feedback algorithm, close to the target flow rate control operation, the output regulation signal to control the frequency converter and other feeder controllers.

The dosage system and weighing instrument realize serial communication based on the development environment. The data from the weighing instrument is sent to the host computer in real time through the serial port, and the read data is intercepted and converted, and the weighing data can be displayed in real time on the operation screen, and at the same time, the weighing data can be stored in the database for querying and tracing the data, which is not only convenient to supervise the weighing process, but also to restrain the worker's operation. The upper computer software of automatic dosage system is designed with PLC program. The WINDOWS-based upper computer software has the functions of real-time process monitoring, overweight/overtime alarm, alarm processing, automatic data saving, querying historical data, printing formula and historical data. The feeding system adopts the rotating feeding basket installed on the screw to receive the materials, which effectively solves the problem that the feeding time in the whole production time accounts for too large a proportion in the dosing program of the lined-up dosing system. The weighing terminal from the signal to rotate to the receiving position is only 2 baskets apart, which is much faster than the receiving speed, and is conducive to improving the efficiency of the entire system. Sequential pick-up method, so that each recipe of small materials in a set order of cascade, so that the process personnel can easily identify the weighing of small materials and troubleshooting in parallel. The dosage weighing device adopts silo screw machine, the material flows to the mixer through the silo, each mixer has two weighing modules, and connected to the junction box, a speed weighing module, the signals through the junction box to the weighing instrument, and then by the dosage weighing instrument will be analog signals and pulse signals to the PLC, PLC processing output signals to the computer to monitor the operation of the PLC will be the computer commands to the weighing instrument for processing. The PLC will transmit the commands from the computer to the weighing instrument for processing. Batching scales and electrical interlocking, can be set from the computer flow, control to the dosage of dosage scales, can be switched through the "switch" button to switch the control, the frequency of dosage is the computer through the PLC to the frequency converter communication to control the output of the frequency converter, so as to change the rotational speed of the silo screw, in accordance with the required amount of dosage of dosage scales. The weighing flow setting at the weighing terminal is set by calculating the required value and outputting it to the PLC, then inputting it to the dosage weighing instrument and adjusting the frequency of the silo screw machine after PID calculation in order to achieve the required amount of material to be discharged.

The automatic dosage system has a mechanism of mutual monitoring between the computer and the weighing instrument and various alarm mechanisms, with animation and PID control functions. The dosage can be operated by clicking on the mouse. The dosage ratio can be changed at any time. When changing the ratio of one material, the other ratios will be automatically adjusted according to their original ratios, which ensures that the total dosage ratio is 100%, thus guaranteeing the quality and yield of the products.