The controller used in the dosing system is Siemens S7-200 programmable controller with dual CPUs to form a redundant system, and the STEP7MicroWin V4.0SP6 programming software provided by Siemens is used as the human-machine interface to write programs to debug programs, download programs, etc. The PC and PLC experimental machine are connected with a PC/PPI cable to communicate, and the appropriate parameters are Setting. Use RS-485 bus to connect the PC with PL. It consists of a water heating unit, weighing module, digital temperature sensor, kettle weighing, data acquisition card and PC. The digital temperature sensor converts the measured temperature of the liquid into a digital quantity and transmits it to the PC through the data acquisition card, and the real-time volume of the mixed liquid is converted into a digital quantity and transmitted to the PC through the data acquisition card. The monitoring system based on LabVIEW software displays the liquid mixing process in real time.

Weighing control system is a kind of batching equipment commonly used in production and construction fields. The main function is to mix different types and sizes in certain proportions to meet specific production or construction needs. There are many key components and principles in the complex process behind the batcher. The operating principles of a batching machine are described in detail below.

1. Construction of the blender

A Feeder usually consists of a silo, a dosing system, a mixer and an electrical control system. Its working process is to feed different specifications into the warehouse, measure the proportion of different specifications through the metering system, and then mix them in the mixer for the final output to the production or construction sites.

2.Measuring system of mixer

The dosing system of the batching machine is the key part to control the proportion and dosage accuracy. It usually includes flat drum meters, load cells and micro-meters. These devices determine the proportions and quantities by conveying different sizes to the silo and then weighing and measuring them, among other things.

3. Batcher's mixer

The mixer is the core component in a batching plant and is responsible for stirring the mixed to produce a homogeneous mixture. The mixer is usually horizontal and utilizes a powerful mixing technology to effectively homogenize the mixture in a short period of time. In the mixer, there is also a water spraying device to carry out water and mixing.

4. Closed conveyor system

The closed conveyor system is a part of the batching machine, which is used to ensure the environmental hygiene and safety of the whole batching process. The closed conveyor system usually consists of conveyors, wear-resistant bends and sealed connectors to ensure that no safety accidents occur due to dry or wet conditions.

5. Electronic control system

The electronic control system is the key part of the batching machine, responsible for controlling the automation of the whole batching process. The electronic control system is usually controlled by human-machine interface or intelligent terminal, and it is also equipped with all kinds of sensors and protection equipments to detect and prevent all kinds of abnormal situations in the whole process.

To summarize, the operation principle of the batching machine is to make a homogeneous mixture by mixing different specifications together through the work of the batching control system and the mixer and other components to meet specific production and construction needs. Through the protection and control of airtight conveying system and electric control system, the stability and safety of the whole batching process can be ensured.