Weighing and feeding system as a whole is a mechanical and electrical integration equipment, the start and braking of the control part of the turntable, the identification of raw materials, opening, capping, weighing, pouring, calibration and so on are completed by the control system. The mechanical part and the control part form a good coordination, and the action is accurate. Advanced control, equipment modeling and process optimization technologies are adopted to realize complete sets of special systems for biological fermentation process, complete sets of special systems for synthetic reaction process and complete sets of special systems for extraction process. It provides a customizable and extensible industry control engineering algorithm library. Based on the unified modeling specification and supported by the batching architecture platform, the batching efficiency can be significantly improved through inheritance, derivation, reuse and reconfiguration mechanisms.
020-34563445In the dosing system, technicians select the raw material formula on the touch screen, input the total amount of dosing and the weight of a single bag of products, and the system adopts the "upper and lower" measurement mode, that is, the weighing module of the weighing reactor is responsible for the weight collection of the feeding part, and the weighing module of the discharging reactor is responsible for the weight collection of the discharging part. After the operator enters the data, click the feeding button, and according to the formula setting, the controller drives the motor of the Feeding machine through the frequency converter. The motor drives the screw Feeder of the feeding machine to transfer the powder to the weighing tank, after reaching the set weight, the powder of the weighing tank is put into the discharge tank, and then the controller switching motor will finish all the raw materials in the formula in turn, and then use the mixing motor in the discharge tank to mix the raw materials evenly, after the mixing is completed, the operator can quantitative output the product according to needs. Set the number of discharge bags, single bag weight, click the discharge button, complete the discharge process in turn.
The core controller of the feeding system is PLC, which is mainly composed of batching production line, operation table (touch screen), speed control subsystem, weight Measurement system, actuator, material level detection and power supply and other ancillary equipment. The equipment needed to build the whole system is connected to PLC. The system is equipped with an emergency stop button when the system is abnormal during the feeding process, emergency stop can be carried out. When the system is abnormal, the buzzer is used to cooperate with the upper computer interface to make corresponding prompts for the convenience of staff. The system uses five access switches installed at the bottom of the silo to detect whether the material level is sufficient. The frequency converter controls several motors through the five-way contactor switch for the sequential loading of powder raw materials. In the data acquisition part, the analog signal is collected by the weighing sensor, which is sent to the transmitter for A/D sampling and then sent to the PLC for processing. The whole weighing tank and mixer are designed with four weighing sensors in series, which are installed at the bottom of the reactor in the form of a rectangle, and the weight information is finally obtained by adding each signal. It is very good to ensure that the load of the weighing sensor is vertically downward, which can ensure the measurement accuracy of the weighing tank and the mixer.
The loading completes the batching work of the whole system. Since it is multi-powder sequential loading, the weighing module is opened for data collection before the loading starts. The PLC writes the speed regulation data into the inverter through the 485 serial port, and starts the motor at high speed for fast loading. When the real-time weight of the raw material reaches the set value 1(obtained according to the system pre-experiment data), frequency conversion speed regulation is carried out for low-speed feeding; when the real-time weight reaches the predetermined value 2(obtained according to the system pre-control), the motor is turned off and the error collection is delayed. If the error range is greater than the error required by the ingredients, the motor's low-speed speed step is dynamically adjusted according to the error size until it is within the required error. After the system enters the jitter stage through reasonable parameter setting, the error requirement can be reached basically 3 times, and the rapidity can be guaranteed. When the feeding is complete, open the weighing valve to release the powder, turn off the current motor and switch the motor corresponding to the next powder, and start the feeding of the next powder until the feeding of all powder is completed.
Discharge completes the discharge work of the whole system, start the discharge bucket stirring motor to mix the powder evenly before discharge, then input the necessary data bag number and bag weight on the touch screen, click the discharge button to start discharge after completion of input. When the real-time weight of the material reaches the set value 3(according to the pre-test data of the system, the set value of different devices is different), the PLC controls the small discharge valve of the linear motor. When the remaining discharge quantity enters the required error range, the discharge valve is closed, and the buzzer sounds to indicate that the discharge is completed and the next bag is ready to discharge.
