Development of PLC-Based Control System for Weight Automatic Verification Devices
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摘要: 针对手动测量砝码质量存在效率低和准确性、复现性差等问题,对砝码测量的工作流程、质量比较仪的稳定性、三维机械手的运动控制,以及加卸载的定位准确度等进行了研究,分析了PLC伺服控制系统的基本原理,设计研制了一套基于PLC的砝码自动化检定装置控制系统。以CX-programmer为开发平台,运用PLC和梯形图编程语言建立了控制系统,实现了砝码加卸载全过程的自动控制和砝码质量的自动化检测,并对该系统进行了整体调试与实验验证。研究结果表明,该控制系统具有结构简单、效率高、避免人为误差等优点,提高了砝码检定的自动化水平与可靠性。Abstract: Aiming at the problems of low efficiency, accuracy, and poor reproducibility of manual measurement of weight quality, the workflow of weight measurement, stability of mass comparator, motion control of three-dimensional manipulator, and positioning accuracy of loading and unloading were studied. The basic principle of the Programmable Logic Controller (PLC) servo control system was analyzed, and a set of PLC-based control system for weight automatic verification devices was designed and developed. Taking CX programmer as the development platform, the control system was established by using PLC and ladder diagram programming language, which realized the automatic control of the whole process of weight loading and unloading and the automatic detection of weight quality. The overall debugging and experimental verification of the system were also carried out. The results showed that the control system has the advantages of simple structure, high efficiency, and avoiding human error, and improves the automation level and reliability of weight verification.
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Key words:
- weights /
- mass comparators /
- automatic control /
- PLC /
- servo system /
- verification
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表 1 控制系统运行稳定性数据
Table 1. Stability verification data for system operation
标称值/g 4次偏差绝对值/mg 允许偏差/mg 结论 200 0.02 0.08 符合要求 *200 0.03 0.08 符合要求 100 0.02 0.04 符合要求 50 0.01 0.025 符合要求 20 0.006 0.020 符合要求 *20 0.008 0.020 符合要求 10 0.003 0.015 符合要求 5 0.003 0.013 符合要求 2 0.004 0.010 符合要求 *2 0.003 0.010 符合要求 1 0.001 0.008 符合要求 表 2 控制系统检定与人工读数检定结果对比
Table 2. Comparison between the verification data from the system and manual detection results
标称值/g 控制系统检
定结果/mg人工读数检
定结果/mg两者差
值/mg200 −0.02 0.00 0.02 *200 −0.05 −0.12 0.03 100 −0.03 −0.01 0.02 50 −0.09 −0.10 0.01 20 −0.003 0.005 0.008 *20 0.014 0.004 0.010 10 0.012 0.006 0.006 5 0.028 0.030 0.002 2 0.004 0.002 0.002 *2 0.006 0.004 0.002 1 0.003 0.002 0.001 -
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