With the increasing market demand for plastic products, the upgrading of injection molding machine equipment is also getting faster and faster. The early injection molding machines were all hydraulic. Due to the need for environmental protection and energy saving, as well as the mature application and price drop of servo motors, more and more all-electric precision injection molding machines have been used in recent years. Only two different types of power are compared. The characteristics of the source injection molding machine will make it possible to clarify the technical development direction of the injection molding machine. 53Cm Pvc Wallpaper,Modern Chinese Embossed Pattern Wallpaper,Daixin Chinese Style Wallpaper,Modern Striped Wallpaper,Geometric figure PVC wallpaper JIANGSU ARTSTYLE DECORATION MATERIALS CO..LTD , https://www.jsadpvcwallpaper.com
The all-hydraulic injection molding machine has many unique advantages in the molding of sophisticated and complex products. It has evolved from the traditional single-cylinder liquid-filled and multi-cylinder liquid-filled type to the current two-plate direct-pressure type, in which two plates are directly pressed. The most representative, but the control technology is difficult, the machining precision is high, and the hydraulic technology is difficult to grasp.
All-electric injection molding has a series of advantages, especially in terms of environmental protection and energy saving. Due to the high precision of the injection control of the servo motor, the rotation speed is also stable, and it can be adjusted in multiple stages. However, all-electric injection molding machines are not as durable as full-hydraulic injection molding machines, while full-hydraulic injection molding machines must use servo valves with closed-loop control to ensure accuracy, and servo valves are expensive and costly.
The electric-hydraulic injection molding machine is a new injection molding machine integrating hydraulic and electric drive. It combines the high-performance and all-electric energy-saving advantages of the full-hydraulic injection molding machine. This electric-hydraulic combined injection molding machine Has become the development direction of injection molding machine technology. The injection molding industry is facing a rapid development opportunity. However, in the cost structure of injection molding products, electricity costs account for a considerable proportion. According to the requirements of the injection molding machine equipment process, the power consumption of the injection molding machine oil pump motor accounts for as much as the entire equipment. 50%-65%, so it has great potential for energy saving. Designing and manufacturing a new generation of "energy-saving" injection molding machines has become an urgent need to pay attention to and solve problems.
The process of injection molding machine is generally divided into several stages, such as clamping, injection, melting, holding, cooling, and mold opening. Different stages require different pressures and flows. For the oil pump motor, the injection molding process is in a changing load state. In the hydraulic system of the dosing pump, the oil pump motor provides a constant flow rate at a constant rotational speed, and excess hydraulic oil is recirculated through the overflow valve. This process is called a high pressure section. flow. According to statistics, the energy loss caused by high pressure throttling is as high as 36%-68%.
With the increasingly strict requirements of environmental protection in the world, such as energy consumption, noise, leakage, etc., energy conservation has been completed as the research focus of injection molding electro-hydraulic systems, and there is a lack of energy loss for valve-controlled electro-hydraulic systems. China, Japan and other countries have developed a load-sensing injection molding electro-hydraulic control system using a combination of variable pump and electro-hydraulic proportional valve. In order to further reduce energy consumption and reduce noise, the latest generation of injection molding machine uses a motor with adjustable speed to drive the hydraulic pump as the power source. It maintains a low speed during pressure keeping, cooling and idle conditions to achieve energy saving and noise reduction. The working principle is as follows:
Using the injection machine synchronization signal and electrical control system, according to the injection molding process requirements, the electro-hydraulic proportional control system is simulated into a load tracking control system, so that the speed of the oil pump motor is proportional to the product of the hydraulic flow and pressure required for the injection molding machine. The traditional quantitative pump is transformed into a variable frequency variable pump, so that the return flow of the overflow valve is minimized, and no high-pressure throttling energy loss is obtained, thereby upgrading the conventional "energy-consuming" injection molding machine with high-pressure throttling to none. High-pressure throttling “energy-saving†injection molding machine, in addition to the main features of energy-saving functions, energy-saving injection molding machine also has the advantages of additional series according to its energy-saving principle, including:
Reduces the opening and clamping impact and prolongs the service life of the machine and the mold.
Extend the service life of the oil circuit system (sealing components, etc.), reduce the number of repairs, and save maintenance.
Reduce noise and improve the working environment.
The temperature of the oil is greatly reduced, and the cooling water consumption can be saved by more than 30%.
The motor has multiple protections such as overvoltage, overcurrent and lack of.
The original control mode and oil path of the injection molding machine are unchanged.
The injection molding machine will be upgraded to an “energy-saving†injection molding machine, and its investment (mainly the inverter) should be recovered within one year by saving electricity or oil.
In short, the development of "energy-saving" injection molding machine is theoretically feasible, with small investment and obvious benefits. Perhaps in the near future, variable-frequency energy-saving injection molding opportunities will become a new selling point in the injection molding machine manufacturing industry.