Application of K20 VSD in food packaging machine

I. Overview

Along with the development of automation, the operation, maintenance and daily maintenance of the packaging machine becomes more convenient and simple, it reduces the professional skills requirements of the operators. The packing quality of product is directly related to the temperature system, the accuracy of the main motor speed, and the stability of the tracking system.

The current pillow-type automatic packaging machine is designed and produced with the most advanced and reliable technology. It brings together the essence of many years of experience in the field of packaging machinery which is widely applied in the market.

2, Working principle

The core control logic of the packaging machine is a tracking system, which uses forward and reverse tracking, it improves the tracking accuracy remarkably. After the machine is running, the thin film mark sensor continuously detects the thin film mark (color mark), and the tracking micro switch of the mechanical part detects the position of the machine. The above two signals are sent to the PLC, and after the program calculation, the PLC output signal to DI1 (Forward tracking), and DI2 (Reverse tracking) to control forward and reverse tracking of the motor, timely detection of packaging material errors in the production process and make accurately compensate and correct, avoiding waste of packaging materials. If the detection fails to meet the technical requirements after tracking a predetermined number of times, it will automatically stopped for inspection to avoid the generation of waste products.

3, Composition of electrical system of automatic packaging machine

Although the application system of the food packaging machine has simple functions, it has higher requirements on the dynamic performance of the transmission. The system requires fast dynamic follow-up performance and high stability of speed accuracy. Therefore, the dynamic technical performance of the inverter is very important, the high-performance inverters can be used to meet the process requirements.

The electrical part of an automatic packaging machine generally consists of the following devices:

 (1) The main control circuit is composed of a frequency inverter and a programmable logic controller (PLC)

 (2) The temperature control circuit is composed of intelligent temperature control meter, solid state relay, thermocouple components, etc. The temperature control is accurate, the display is intuitive, and the setting is convenient.

 (3) Multi-point tracking and detection by photoelectric switches, electromagnetic proximity sensors, etc.

The frequency inverter wiring diagram is shown below:

4, The characteristics of K20 frequency inverter

K20 series inverter can meet the requirements of packaging machines, because it has the following characteristics:

(1) Apply slip frequency automatic compensation control technology to automatically correct the frequency to achieve the effect of stable motor speed when the load changes.

(2) With high stability speed accuracy and fast dynamic response, it can meet the control requirements of high performance system. It reduces the time and economic losses due to drive system failures. It has lower maintenance costs.

(3) It has the advantages of rich functions, stable performance, compact size and low noise operation.

5, The advantages of applying K20 series variable frequency drive

(1) Simplify the transmission system, greatly reduce the failure rate, and reduce the maintenance costs for the enterprise.

(2) Increase production capacity and reduce costs. It can improve production technology, improve product output and quality, and effectively save costs and maximize the profits.

(3) Realize software control and improve performance.

(4) Through the functions of torque compensation, prevention of stall and restart, etc., non-trip operation is realized; the quality of the products produced is stable and the efficiency is improved.

6. Conclusion

Due to the use of variable frequency drive, the chain transmission is greatly reduced, the stability and reliability of the machine is improved, the noise of the machine is reduced, and the packaging machine is efficient, low-loss, and full-automatic control.