In recent years, the development of the plastic industry has become increasingly agile, and the injection molding industry is also facing a rapid development opportunity. But at the same time, the competition within the profession is becoming increasingly fierce. In addition to focusing on product quality and brand, manufacturers are also paying more attention to controlling production costs. From the process of injection molding machine technology, it is known that electricity consumption accounts for a large proportion of the cost of injection molding products. Therefore, whether it can effectively reduce electricity loss has received attention from various injection molding machine manufacturers and users. With the promotion of variable frequency speed regulation technology, variable frequency speed regulation has been widely used in the fields of transmission control and energy conservation, especially in pump load applications where variable frequency control is more energy-efficient. This article takes the Sifang V560 series frequency converter as an example to introduce a frequency conversion control application plan for the injection molding machine profession.
A plan has been designed for the Sifang V560 series frequency converter to be equipped with a dedicated expansion card based on the molding process and process characteristics of the injection molding machine. The system composition is shown in Figure 1, and the details are as follows:
1. The dedicated expansion card integrates four analog input channels, two voltage type and two current type, providing input interfaces for different types of flow and pressure commands;
2. Integrated multi-stage speed control, which can be combined with flow and pressure setting signals to determine the operating frequency of the frequency converter;
3. Bottom flow can be set to improve the response speed and stability of the system.
Plan advantages:
1. It has a dedicated operating frequency channel for injection molding machines, with short acceleration and deceleration time and agile system response;
2. The system has strong current suppression ability, effectively preventing the occurrence of overcurrent and other problems, and ensuring stable operation of the system;
3. The function of superimposing multi-stage speed, flow rate, and pressure commands facilitates the implementation of different process requirements for operating frequency;
4. The temperature rise of the hydraulic oil in the injection molding machine has significantly decreased, effectively extending the service life of the hydraulic oil;
5. The system has good energy efficiency, generally reaching 20% to 50%.
This article introduces a drive plan for an injection molding machine based on a quad V560 frequency converter. The plan has the advantages of short acceleration and deceleration time, agile system response, and stable system operation. The system has strong skills and significantly reduces the temperature rise of the hydraulic oil in the injection molding machine, effectively extending the service life of the hydraulic oil. It has now been successfully applied to multiple injection molding machine energy-saving renovation sites.