Application of main automation products in the hot

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Usage of main automation products in the plastic machinery industry

the plastic machinery automation market exceeded 1billion yuan in 2005, with a year-on-year increase of 5.6%. At present, the automation products used in plastic machinery mainly include control system, transmission control, motion control, man-machine interface and sensors

among them, drive control, controller and low-voltage electrical apparatus are the three most important products in the plastic machinery automation market at present. In 2005, the sales of these three types of products accounted for 48%, 23% and 15% of the total scale of the plastic machine automation market respectively

the use of main automation products in the plastic machinery industry is as follows:

1.) Controller

at present, the control of domestic plastic machinery mainly adopts special controller and PLC, and a few low-end equipment adopt relay control. The control points of domestic plastic machinery are generally within 128io, and the control points of a few large plastic film production lines may exceed 6000 IO, using multiple PLCs and IPC

different types of plastic machines also have different types of controllers. Injection molding machines and small blow molding machines mainly use special controllers (embedded products), and a small amount of PLC and the formed film can fit the skin relay well; The extrusion equipment mainly uses PLC and a small amount of special controller; Auxiliary equipment is mainly controlled by PLC and relay

as the control of ordinary plastic machinery is relatively simple, and most of the machines are operated by a single machine, the plastic machinery does not have high requirements for the reliability of the control system due to the limitation of the mechanical reliability level. Therefore, the special controller developed with embedded products can meet the needs of the vast majority of users and has great advantages in price, Therefore, it is widely used in this industry. Therefore, the paper industry will continue to be a year of challenges and opportunities, especially in injection molding machines, and in blow molding equipment. In the extrusion equipment, due to the high reliability, short development cycle and mature application of PLC, the application of PLC occupies a leading position. At present, some artists of PLC brands that are widely used in this industry have long been tired of traditional means, such as Siemens, Omron, Mitsubishi, NAIS, LG, etc. Siemens provides a series of PLC based plastic mechanical controllers

with the development of plastic machinery technology, the controller is no longer a simple action control, but a comprehensive control of various parameters including melt temperature, injection pressure, injection speed, pressure holding time, cooling process and hydraulic circuit. In the past, most of them used open-loop control, but now they are developing towards closed-loop control. The new equipment has further requirements for the control ability and response speed of the controller. The traditional controller based on embedded products is difficult to meet these requirements. Therefore, PLC is mainly used in new equipment and large equipment. The use of PLC in high-end and large-scale equipment and the use of special controller in medium and low-end equipment will not change in the plastic machinery industry in the next three years. Competitive price is the premise to enter the largest number of general plastic mechanical controller market

2.) Transmission

the transmission of plastic machinery mainly refers to the oil pump motor and screw extruder motor. The power is mostly between 5.5 – 55 kW, and the multi motor solution is adopted for higher power

the production process characteristics of plastic machinery have great energy-saving potential. Taking the injection molding machine as an example, the process of the injection molding machine is generally divided into several stages, such as mold locking, glue injection, glue melting, pressure maintaining, cooling, mold opening, etc., and each stage requires different pressure and flow. For the oil pump motor, the injection molding process is in a changing load state. In the hydraulic system of the quantitative pump, the oil pump motor provides a constant flow at a constant speed, and the excess hydraulic oil flows back through the overflow valve. This process is called high-pressure throttling, which will cause energy loss. The use of frequency converter can solve this problem. By adjusting the speed of oil pump, the oil pump can provide appropriate oil pressure at different stages of injection molding machine production and minimize energy loss. Some end users were the first to use frequency converters in plastic machinery. System integrators provided them with frequency conversion and energy-saving transformation schemes for plastic machinery, with remarkable results. Therefore, more and more plastic machinery users used frequency converters to transform their equipment. In response to this demand, plastic machinery manufacturers also began to use frequency converters in plastic machinery. Users of plastic machinery can choose the model with frequency converters. In order to reduce one-time investment, most users still choose plastic machinery without frequency converter. They can carry out frequency conversion and energy saving transformation in the subsequent use process

the main purpose of using frequency converter for plastic machinery is to save energy. The requirements for frequency converter are relatively low. At present, the main suppliers in the market can provide frequency converter products that meet the needs of plastic machinery. Therefore, price has become a key factor in entering the market. Domestic manufacturers have certain advantages, and they perform best in the plastic machinery industry

3.) Motion control

servo and motion control products are mainly used in all electric plastic machinery to replace the traditional hydraulic system. Compared with hydraulic system, servo system has the advantages of high control precision, small maintenance, good production environment, high production efficiency and power saving. It is more and more used in occasions with high product precision requirements, such as automobile and medical devices

due to the development and progress of hydraulic plastic machinery, it can meet almost all the requirements at present. Therefore, although the all electric plastic machinery has higher technical indicators, its rapid development in the market is limited by the high cost. It is suitable for the laboratory exhibition of steel and building materials testing with high requirements. There is only a small amount of production, and it mainly faces the foreign market

although the price of servo products is decreasing, the technology of hydraulic injection molding machine has also been greatly improved. Therefore, the application of servo products in China's plastic machinery industry will not change much in recent years, and only a small amount of servo products are used on high-end models. Due to the characteristics of servo products, plastic machinery manufacturers need external technical forces to provide them with solutions

from the overall view of the plastic machinery automation market, the current growth of the industry mainly comes from the increase of the plastic machinery supporting transmission market. (end)

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