Industry introduction

Filling machine is mainly a small class of products in the filling machine, from the point of view of the packaging of materials can be divided into volume filling machine, weighing filling machine, etc.; from the degree of automation in terms of the production of automatic filling machine and filling production line, recently with the CE certification of the active agent, manufacturers have begun to pay attention to the quality of the product and packaging, so the status of the filling equipment to come to the fore.

Customer demand

The customer wants to improve the degree of automation through the filling machine, through the PLC control to remove the shortcomings of the previous simple relay control, to ensure that the metering filling more durable, and can be set through the text of the filling capacity. Due to the wide sales market of metering and filling machine, the customer requires PLC to have better industry reputation and higher stability, to enhance the product grade and ensure the normal operation of the filling system for a long time, and to reduce the maintenance cost in the later stage.

The solution

Semi-automatic filling control process is relatively simple, mainly sequential control. In this case, Yonghong FBS-MA series economic host is chosen as the control unit. For different automatic filling models, respectively, the selection of the corresponding host. The human-machine interface selected Yonghong FD101 text control.

Program Background

Yonghong MA series economic host has 10 points to 60 points of different models, the host is configured with up to 8 points of 20KHz high-speed counting, 8 points of 20KHz high-speed pulse output, and can be expanded to two communication ports, the communication rate of 921.6Kbps. PLC program execution rate of 0.33uS, the program capacity of up to 20KWords, 36 sequential commands, the application of the command 326 (126 types)

Weighing and Filling Design

1 Hardware configuration

The control core of the filling machine adopts one Yonghong FBs-10MA host, which is configured with 6-point input and 4-point output. The host comes with an RS232 communication port, in addition to being used as a programming port can also be used as a slave station for the man-machine or other metering and filling machine. The human-machine interface uses a FD101 text.

2 process design

This filling machine for automatic metering control, each start after the implementation of a cycle, you need to manually adjust the barrel position to restart; the following details of the process flow as follows: press the start button, pump start, two flow valves open, the flow meter began to record the flow rate of flow through a flow meter to reach the set value of the flow valve is closed, when the other one to reach the set value of the valve closes the pump to stop, The conveyor belt starts to run; this completes a working cycle.

3 software design

Metering filling machine process, it can be seen that the control is a typical sequential process control. Yonghong PLC programming instructions more than 300 kinds of instructions, and the most humane, readable and strongest multi-input / multi-output instruction format, a directive to achieve most of its PLC several instructions to do the function, so that the program is greatly streamlined, while the results of the operation can be obtained directly from the internal or external output. It is very convenient and easy to design, operate and maintain. Filling control is mainly the application of the two-way hardware high-speed counting function of Yonghong PLC, through the two-way flowmeter respectively control the opening and closing of the filling port, through the specialized hardware high-speed counting instructions and I / O settings, easy to achieve the purpose of accurate measurement, and reduces the difficulty of programming, improves the convenience of the program and easy to read.

4 Human-machine interface editing

The human-machine interface integrates recipe management, filling and weighing, personnel management, report generation, providing interface and data management, the key is to solve the data communication between the computer and the filling system. Completion of the raw materials and raw materials selected in the formula to set the standard weight and error weight as well as to provide for the weighing of the selected raw materials weighing scale number.

The filling control process is clearer and works in only one cycle process. The commissioning was also done step by step in accordance with the sequential control. First tested the pump control and flow control valves, and then through the panel display to test the flow meter measurement function; debugging basically completed the expected function of the isopropyl alcohol quantitative filling machine.

Implementation effect

After on-site commissioning, the weighing and filling machine fully meets the customer's functional requirements for filling, and through the content of the simple human-machine interface settings, application parameter setting display, etc., so that the filling automation, humanization degree is higher. The implementation of this case, the customer's recognition of Yonghong PLC products, Yonghong products, stable, reliable, superior performance has also been well verified in this case.

Application experience

The excellent performance, reliability, stability and ease of operation of the host of the Yonghong FBS series is deeply experienced in this case. the PLC is based on Yonghong's self-developed SOC as the core, integrating the Central Processing Unit (CPU), Hardware Logic Processor (HLS), high-speed communication ports, high-speed counters/high-speed timers, and NC positioning into a single unit, which makes it faster and more stable. The humanized editing, monitoring, and debugging functions of WinProladder programming software are more easily accepted by users and improve the efficiency of project development.