At present, the popular robots for injection molding machines on the market are the minimum control systems using dedicated microprocessors and interfaces for the control system. In terms of mechanical construction, when the positioning accuracy is not high, the timing belt drive is adopted, and the running part is equipped with a slide rail guide, which is controlled by the frequency converter speed control. This paper proposes a special manipulator for injection molding machine based on PLC control, making full use of the characteristics of PLC flexible control. The walking part is equipped with slide rail guide, adopting helical gear rack drive and frequency conversion speed control; it is a cost-effective electromechanical integration equipment. . The article makes a relatively complete discussion of the machine from two levels of mechanical construction and electrical control.
1 Introduction
In plastic products, they are classified into four categories according to the different processing methods of the products. One is injection molding products; the second is blow molding products; the third is extrusion molding products; and the fourth is calender molding products. Among them, the most widely used, the most variety, the highest precision, when the number of injection molded products, from the daily necessities of the pots and bowls, children's toys, to the parts of precision industrial equipment, with various With the continuous emergence of new polymer materials, many metal parts are also gradually being replaced by these new materials. In order to meet the requirements of automatic production of injection molding products, in order to ensure high quality and high efficiency of products, manual intervention must be minimized. Based on the above ideas, many injection molding machine manufacturers have included the equipment of special robots for injection molding machines in the scope of customer-assisted selection. .
However, for the original injection machine, most of them do not have this device. Therefore, the development of a special auxiliary manipulator suitable for the injection molding machine has become an important means and an inevitable choice for improving the competitiveness of the manufacturer's products.
2 industry status
Various types of robots are essential equipment for automated production. Especially in dangerous situations, it is of great significance to use robots instead of people in an environment that seriously threatens people's safety and health.
The plastics industry in the Pearl River Delta region is very developed and has a leading position in the country. It is also known as the world factory in the Pearl River Delta. At present, the special robots for injection machines used in this industry are produced in Taiwan, such as the Jinli brand robots produced by Taiwan Jinli Company and the special robots of the Wadeke W255 series injection machines produced by Taiwan Weideke International Co., Ltd. and many more.
Analyze the structure of such a robot, the electrical control system generally adopts the microcomputer minimum system or single-chip system, and the manipulator drive part adopts pneumatic drive, frequency conversion speed drive and servo drive. In the mechanical construction, the slide rail structure is adopted with the timing belt drive, or the ball and pinion rack structure is equipped with the slide rail guide. The overall design idea is to use mature control technology and mechanical parts and institutions as much as possible.
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