드라이브 ㆍ 컨트롤 (Journal of Drive and Control)

  • 제15권4호
  • /
  • Pages.17-22
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  • 2018
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  • 2671-7972(pISSN)
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  • 2671-7980(eISSN)
유공압건설기계학회 (The Korean Society for Fluid Power and Construction Equipment)
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모바일 유압장치에서 부하의 유지와 내림 특성 비교

Analysis of Characteristics of Load Movement in Mobile Hydraulic Equipment

  • Jo, Mi Hyeon (Graduate School, Korea University of Technology and Education) ;
  • Huh, Jun Young (School of Mechatronic Engineering, Korea University of Technology and Education)
  • 투고 : 2018.08.03
  • 심사 : 2018.10.02
  • 발행 : 2018.12.01
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초록

Mobile hydraulics require higher energy efficiency, and a simpler as well as robust design, than general industrial hydraulics. The 6/3-way directional control valve is widely used as a mobile hydraulic control valve. However, since the 6/3-way directional control valve is a spool type valve, it is difficult to maintain the load. A counterbalance valve is typically used, to maintain the load, and lift down. However, in an industrial field using a mobile hydraulics device, a pilot controlled check valve may be used to implement holding and lifting operation of the self-weight load, and a relief valve may be used simply to exert back pressure. But no comparative analysis of advantages and disadvantages of each method was revealed. In this study, various methods of holding and unloading load with self-weight in mobile hydraulics are investigated, and compared through simulation using AMESim software. This is experimentally verified by using Festo's mobile hydraulic test rig TP800.

키워드

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Fig. 1 3 circuits controlling load movement (a) Double non-return valve (b) Pressure relief valve (c) Counterbalance valve

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Fig. 2 High capacity counterbalance valve

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Fig. 3 Counter Balance Valve

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Fig. 4 Schematic diagram of the poppet used in counterbalance valve

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Fig. 5 Hydraulic circuit of counter balance valve with load simulator

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Fig. 6 Hydraulic components arrangement

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Fig. 7 Control Valves (a) Double non-return valve (b) Counterbalance valve

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Fig. 8 Pressure at cylinder rod side with load

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Fig. 9 Pressure at cylinder rod side without load

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Fig. 10 Pressure at cylinder rod side in case of using DNRV

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Fig. 12 Signal to 6/3 direction control valve and rod displacement in case with load

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Fig. 13 Pressure at cylinder head side with load

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Fig. 14 Pressure at rod side of cylinder with load in case of DNRV

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Fig. 15 Signal to 6/3 direction control valve

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Fig. 16 Pressure at head side of cylinder

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Fig. 17 Pressure at rod side of cylinder without load

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Fig. 11 AMESim Model of counterbalance valve

Table 1 Cylinder rod side static pressures for two loads

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Table 2 System Parameter

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참고문헌

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  3. S. H. Lee, W. J. Sung and K. S. Chung, "A Study on the Dynamic Characteristics of Counter Balance Valve for High Load," Journal of the Korean Society of Tribologists and Lubrication Engineers, Vol.18, No.1, pp.68-74, 2002.
  4. S. R. Lee, "Optiomal Design of the Hoist Hydraulic System Including the Counter Balance Valve and Differential Cylinder Circuit," Journal of Drive and Control, Vol.5, No.1, pp.48-54, 2008.
  5. T. J. Um, "Design Optimization of the Counter Balance Valve System," Autumn Annual Conference of IEIE, pp.85-89, 1996.
  6. J. W. Chung, "Design of Hydraulic Actuating Circuit of doing Over-running Load," Journal of Korean Society of Mechanical Technology, Vol.17, No.2, pp.413-418, 2015. https://doi.org/10.17958/ksmt.17.2.201504.413
  7. I. Y. Lee, Hydraulic Engineering, Munundang Publish., Co., Seoul, pp.239-240, 2012.