Original Articles Open access

The design of a force feedback soft gripper for tomato harvesting

Authors

Published
18 March 2021
Section
Original Articles
DOI
10.4081/jae.2021.1090

Abstract

In smart farming, both artificial intelligence and robotic systems are applied in order to improve efficiency. In agriculture, for jobs such as seeding, monitoring, and harvesting, robots are widely used. When using robots to harvest fruit and vegetables, it is essential not to apply excessive force, as it may damage the harvest. In this paper, a soft robotic three-fingered gripper is presented. It was designed and analysed using the finite element method. Each finger is made of silicone rubber. The shape of the finger is designed so that it is capable of handling spherical shaped objects, such as tomatoes or oranges. When holding a tomato, the fingers apply the contact force. The fingers are actuated pneumatically and the force applied is also controlled by a micro controller. The pressure inside the air chamber of the finger is in the range of 0- 95 kPa. Force sensors are attached to the end of each finger to provide force feedback. Then, the holding force is adjusted and applied to the surface of the tomato. The gripper can successfully grasp tomatoes with a force less than the bio-yield of the tomatoes 2.57 N.

Keywords

References

  1. Bernardi L., Hopf R., Ferrari A., Ehret A.E., Mazza E. 2017. On the large strain deformation behavior of silicone-based elastomers for biomedical applications. Polym. Test. 58:189-98. DOI: https://doi.org/10.1016/j.polymertesting.2016.12.029
  2. Brown E., Rodenberg N., Amend J., Mozeika A., Steltz E., Zakin M. R., Lipson H., Jaeger H.M. 2010. Universal robotic gripper based on the jamming of granular material. Proc. Natl. Acad. Sci. 107:18809-14. DOI: https://doi.org/10.1073/pnas.1003250107
  3. Hao Y., Liu Z., Liu J., Fang X., Fang B., Nie S., Guan Y., Sun F., Wang T., Wen L. 2020. A soft gripper with programmable effective length, tactile and curvature sensory feedback. Smart Mater. Struct. 29:035006.
  4. Hayashi S., Ganno K., Ishii Y., Tanaka I. 2002. Robotic harvesting system for eggplants. JARQ. 36:163-68. DOI: https://doi.org/10.6090/jarq.36.163
  5. Ji C., Zhang J., Yuan T. , Li W. 2014. Research on key technology of truss tomato harvesting robot in greenhouse. Appl. Mech. Mater. 442:480-86.
  6. Jinliang G., Zhao D., Wei J., Wu X. 2010. Design and control of the open apple-picking-robot manipulator. pp 5-8 in 3rd Int. Conf. Comp. Sci. Info. Tech., Chengdu, China. DOI: https://doi.org/10.1109/ICCSIT.2010.5564770
  7. Lehnert C., English A., McCool C., Tow A.W., Perez T. 2017. Autonomous sweet pepper harvesting for protected cropping systems. IEEE Rob. Autom. Lett. 2:872-9. DOI: https://doi.org/10.1109/LRA.2017.2655622
  8. Liu J., Li P., Li Z. 2007. A multi-sensory end-effector for spherical fruit harvesting robot. pp 258-62 in IEEE Int. Conf. Autom. Logist., Jinan, China. DOI: https://doi.org/10.1109/ICAL.2007.4338567
  9. Liu J., Li Z., Wang F., Li P., Xi N. 2013. Hand-arm coordination for a tomato harvesting robot based on commercial manipulator. pp 2716-20 in IEEE Int. Conf. Rob. Biomimetics, Shenzhen, China. DOI: https://doi.org/10.1109/ROBIO.2013.6739884
  10. Monta M., Kondo N., Ting K.C. 1998. End-effectors for tomato harvesting robot. J. Artif. Intell. Rev. 12:11-25. DOI: https://doi.org/10.1023/A:1006595416751
  11. Mosadegh B., Polygerinos P., Keplinger C., Wennstedt S., Shepherd R.F., Gupta U., Shim J., Bertoldi K., Walsh C.J., Whitesides G.M. 2014. Soft robotics: pneumatic networks for soft robotics that actuate rapidly. Adv. Funct. Mater 24:2109. DOI: https://doi.org/10.1002/adfm.201470092
  12. Sirisomboon P., Tanaka M., Kojima T. 2012. Evaluation of tomato textural mechanical properties. J. Food Eng. 111:618-24. DOI: https://doi.org/10.1016/j.jfoodeng.2012.03.007
  13. Truby R.L., Wehner M., Grosskopf A.K., Vogt D.M., Uzel S.G.M., Wood R.J., Lewis J.A. 2018. Soft somatosensitive actuators via embedded 3D printing. Adv. Mater. 30:1706383. DOI: https://doi.org/10.1002/adma.201706383
  14. van Henten E.J., Hemming J., van Tuijl B.A.J., Kornet J.G., Meuleman J., Bontsema J., van Os E.A. 2002. An autonomous robot for harvesting cucumbers in greenhouses. Auton. Rob. 13:241-58. DOI: https://doi.org/10.1023/A:1020568125418
  15. Wang G., Yu Y., Feng Q. 2016. Design of end-effector for tomato robotic harvesting. IFAC-Papers OnLine 49:190-3. DOI: https://doi.org/10.1016/j.ifacol.2016.10.035
  16. Wang Z., Zhu M., Kawamura S., Hirai S. 2017. Comparison of different soft grippers for lunch box packaging. Rob. Biomimet. 4:10. DOI: https://doi.org/10.1186/s40638-017-0067-1

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