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Abstract

A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no lowfrequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
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Bibliography

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[9] Sun, B., Teng, Z., Hu, Q., Lin, H., & Tang, S. (2020). Periodic noise rejection of checkweigher based on digital multiple notch filter. IEEE Sensors Journal, 20(13), 7226–7234. https://doi.org/10.1109/JSEN.2020.2978232.
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Authors and Affiliations

Hyun-Ho Lee
1
Kyung-Taek Yoon
1
Young-Man Choi
1

  1. Ajou University, Department of Mechanical Engineering, 206, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea, Suwon, Republic of Korea
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Abstract

A checkweigher is an automatic machine to measure the weight of in-motion products. It is usually located around the end of the production process and ensures the weight of a product within specified limits. Any products are taken out of line if their weights are out of the specified limits. It is usually equipped with an optical device. It is used to make a trigger to set the time duration to allow a product to move completely on the weigh belt for sampling the weight. In this paper, a new method of mass measurement for checkweighers is proposed which uses just signal processing without the optical device. The effectiveness of the method is shown through experiments. Also a possibility of faster estimation of weight is shown.
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Authors and Affiliations

Kengo Fukuda
Koji Yoshida
Tetsuya Kinugasa
Morihito Kamon
Yoichiro Kagawa
Toshiro Ono

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