注塑機畢業(yè)設計外文翻譯-文庫吧資料
2025-05-21 22:20本頁面
【正文】 le in the CPU puting power to allow the premise, according to the user39。 second motion control system to the process of injection pressure, velocity and displacement multiple class switching. In the temperature control, its control accuracy has reached a 177。On the control of plastic injection molding machine Modern plastic injection molding machine is a set of mechanical, electrical and fluid in one typical system, as this device has forming plex products, less postprocessing, processing characteristics of the plastic variety, since its inception has grown rapidly, the current full Over 80% of the world39。s products are used plastic injection molding machine for processing. Conventional injection molding machines generally use a simple openloop control, that is, in accordance with a preset value of control. In the device manufacturing process, preconfigured parameter values, such as the clamping force, cycle time, temperature, etc., from the machine in the production process be maintained. For example, by controlling the die temperature can be maintained the temperature of heating fluid, plastic temperature can be outside the heating device by controlling the power to maintain. This control method of simple structure, however, poor antiinterference ability to control the temperature is relatively low. At present, more injection molding machine uses a closedloop control, that is, according to online measurement value and set the value of the deviation control. Closedloop control system uses a negative feedback loop, antijamming ability, when the injection speed, injection pressure, mold cavity temperature, cavity pressure, melt temperature and oil pressure due to interference in the production process, deviation of the machine through the adaptive control system for automatic correction of interference. This control method of antiinterference ability, high control accuracy. More advanced control method is to apply puter controlled, that is, to build a closedloop realtime puter control system. It includes direct digital control system (DDC), supervisory puter control system (SCC), distributed control system (DCS) and multilevel control of several types. Commonly used injection molding machine control system has three kinds, namely, the traditional relaybased, programmable controllers and puterbased control type. In recent years, programmable logic controller (referred to as PLC) with its high reliability, highperformance characteristics in injection molding machine control system has been widely used. In order to improve the level of injection molding machine control system and quality, a higher level than the PLC, control system design specifically for small and medium programmable puter controller (PCC) came into being. PCC integrates a standard PLC and industrial control puter features, multitask timesharing operating systems, data puting and processing power more powerful than the PLC. PCC formed with injection molding machine control system in order to achieve, including position control, sp
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