微量高塑化流变制样仪控制系统设计

发布时间：2017-12-27 03:09

本文关键词：微量高塑化流变制样仪控制系统设计　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前国内外对新材料流变性能和力学性能的测试需要多套仪器设备共同配合,被测物料在多套仪器设备之间往复进行,设备成本高、操作过程繁琐,而且清洗工作量大、物料消耗较大。在合成初期,新材料合成量往往不足,难以满足仪器设备对被测物料消耗量的要求,不能完全达到对流变参数和力学性能参数测试的目的,有时只能有选择的测试1-2个参数。针对上述问题,本文设计一款功能高度集成的流变制样仪控制系统,使其同时具有转矩流变测试、毛细管挤出流变测试、毛细管注射流变测试和挤注快速换模制样的功能,用于天然高分子材料和合成高分子材料的加工性能测试和使用性能制样。首先,通过对流变仪和制样仪原理进行分析,设计流变制样仪控制系统总体方案。通过采用PLC控制及伺服电机控制技术,构建基于Modbus RTU通讯协议的流变制样仪控制系统。该系统是以计算机为核心的集散控制系统:计算机将控制指令传递给PLC,PLC通过Modbus RTU通讯协议与各个设备之间进行通信,可以大大提高系统检测数据的可靠性,便于日后仪器的维护和扩展。其次,设计温度控制模块、动力驱动模块、位置控制模块。各个模块自行执行计算机的指令并采集相应的数据并返回给PLC,最后由PLC将数据进行整合上传给计算机。由PLC的温度测量模块实现对加热电阻丝温度的控制;压力和转矩测量则由两台伺服电机的控制器采集伺服电机反馈扭矩经计算机进行相应换算实现;位置控制子系统通过外部编码器读取推料杆实时位置数据,由计算机根据实时位置对伺服电机进行控制,可实现高精度位置控制;同时有一台合模步进电机,在制样挤出时将模具与挤出口牢牢固定。然后,根据功能模块对其控制系统软件进行设计,流变制样仪控制系统软件由上位机控制软件和下位机模块控制程序组成。计算机主控软件包括用户接口模块、下位机设备相应软件控制模块和数据分析模块。下层设备主要包括温度控制模块、动力驱动模块以及位置控制模块。最后设计实验对流变制样仪控制系统进行验证,实验表明,本文设计的流变制样仪控制系统功能集成度高,工作效率高,而且可以提高测试精度,减少被测物料消耗,还可以满足新材料研究过程中必要的实验需求。
[Abstract]:At present, the test of rheological and mechanical properties of new materials at home and abroad requires multiple instruments and equipment to cooperate with each other. The tested materials are reciprocating between multiple sets of instruments and equipment. The equipment cost is high, the operation process is tedious, and the workload of cleaning is large, and the consumption of materials is large. In the early stage of synthesis, the amount of new materials is often insufficient, which is difficult to meet the requirements of instruments and equipment for the consumption of tested materials, and can not achieve the purpose of testing rheological parameters and mechanical properties. Sometimes only 1-2 parameters can be selected selectively. Aiming at the above problems, this paper designs a highly integrated flow sampling instrument control system, which has the torque rheological test, Capillary Extrusion rheological test, rheological test and capillary extrusion injection molding quick change kind of function, performance test for processing natural polymer and synthetic polymer materials and performance of sample preparation. First, through the analysis of the principle of the convective instrument and the sample making instrument, the overall scheme of the control system of the rheometer is designed. By using PLC control and servo motor control technology, a rheological sample control system based on Modbus RTU communication protocol is constructed. The system is a distributed control system with the core of computer: computer control instructions to PLC, the communication between PLC and other RTU devices through the Modbus communication protocol, can greatly improve the reliability of test data of the system, to facilitate the maintenance and expansion of the day after the instrument. Secondly, the temperature control module, the power drive module and the position control module are designed. Each module carries out the instructions of the computer and collects the corresponding data and returns it to the PLC. Finally, the data is integrated and uploaded to the computer by PLC. By the temperature measurement module PLC to achieve control of the heating resistance wire temperature; pressure measurement and torque controller of servo motor by the acquisition of two servo motors torque feedback via computer, the corresponding realization of conversion; position control system reads the pushing rod real time position data through the external encoder, by the computer according to the real-time position of servo control the motor, which can achieve high precision position control; at the same time there is a clamping stepper motor, in preparation of Extrusion Moulds and extrusion firmly. Then, according to the function module, the control system software is designed. The control software of rheology sampling instrument is composed of upper computer control software and slave module control program. The computer main control software includes the user interface module, the software control module of the lower computer equipment and the data analysis module. The lower equipment mainly includes the temperature control module, the power drive module and the position control module. The final design of experimental verification is performed on the rheological sampling instrument control system experiment shows that this design flow sampling instrument control system features high integration, high working efficiency, and can improve the precision and reduce the measured material consumption, can also meet the requirements of the experimental research of new materials in the process of.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ315;TP273

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