

The measuring dosing machine adopts the pulse width modulation control method based on the incremental PID algorithm. The adjustment signal obtained by the incremental mode is output to the D/A holding circuit through the PB1 port. The D/A holding circuit converts the duty cycle of the PWM square wave into the corresponding 0-5V voltage value, and outputs it after photoelectric isolation.

Automatic feeding system (metering dosing machine) is suitable for conveying, metering and batching powdery and granular materials (such as refractory, cement, fly ash and pulverized coal, etc.). A complete set of automatic equipment with weighing and batching trolley, screw and belt as conveying tools for materials, and dynamic weighing and batching control at the same time. The Batching system can control the weight and flow of the materials loaded into the weighing batching vehicle through the man-machine configuration monitoring system and PLC program according to the specific production process requirements of users, so as to realize accurate metering and batching. As a complete automatic control device for dynamic continuous metering and batching, the system can also provide accurate metering data and control means for production control and management in various industrial fields.
Composition of automatic feeding system (measuring dosing machine)
1. Feeding part: The feeding part is the part that feeds materials from the silo to the weighing equipment. According to the different characteristics of materials, different feeding equipment, such as electromagnetic vibrating Feeder and screw feeder, is selected.
2. Weighing part: The weighing part is composed of weighing sensor, standard connector, junction box and hopper scale, and works with weighing instrument to weigh materials and detect errors.
3. Discharge equipment: The discharge equipment can be weighing equipment (decrement method) or discharge equipment (increment method and zero position method), and usually consists of an emptying valve, an electromagnetic vibration feeder, a screw feeder and an electro-pneumatic valve.
4. Control system: The batching control system consists of weighing instrument, upper industrial computer, programmable controller and other control devices.
5. Scale calibration system: The sensor of the batching system should be calibrated regularly to ensure the batching accuracy of the system.
Metering feeder is usually composed of automatic batching control system, controlled feeding device (equipment) and monitoring system. Compared with manual batching, it can not only save a lot of labor cost and intensity, reduce the harm of environment to human body, but also improve the stability, accuracy and efficiency of end products. It brings great benefits to production enterprises. For the ingredients of different materials, it is necessary to customize and design the corresponding control system.
Product features:
Monitoring function: detect and monitor the instantaneous flow, daily accumulation, monthly accumulation, annual accumulation and other parameters in the batching process of belt scale;
Screen display: the computer monitor can display the running status of relevant control parameters in the batching process, and display real-time batching curves and tables;
Print management: you can print the ingredient report at any time for saving and querying;
Data processing: the batching system can automatically calculate and process the collected signals and output them to the corresponding control quantities;
Communication function: bidirectional data and information exchange can be carried out between industrial computer, PLC and instrument;
Control function: according to the corresponding set value before operation, automatically control the normal operation of the equipment, including PID adjustment;
Alarm function: the upper computer gives an alarm for various parameters exceeding the limit or abnormal equipment state by means of picture and acousto-optic signal.