• 제목/요약/키워드: Hydraulic Breaker

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유압 브레이커의 타격 에너지 측정을 위한 유압 변환장치 개발 (Development of the Hydraulic Pressure Transducer System for Testing the Impact Energy of Hydraulic Breaker)

  • 이근호;이용범;정동수
    • 한국정밀공학회지
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    • 제21권4호
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    • pp.154-160
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    • 2004
  • Hydraulic breaker of excavator has been used for the destruction and disassembling of buildings, crashing road pavement, breaking rocks at quaky and etc. The performance of breakers is evaluated their own destructive force and the number of impact by input hydraulic flow rate and pressure on the operating conditions. Because hydraulic breakers generate high impact energy, the accurate measurement of the impact force has been facing a technical challenge. In this study, the hydraulic pressure transducer system was developed based on the characteristics of pressure variation in closed vessel fur testing the impact energy. The hydraulic pressure transducer system is consisted with a hydraulic cylinder, main base, pressure & temperature sensors, LVDT, data acquisition system and etc. The developed hydraulic pressure transducer system was applied to measure the impact energy for hydraulic breaker. The measured impact force was 438.8 kgf.m within the designed impact force bounds. The developed hydraulic pressure transducer system as a simple tester could be applied to measure the impact force and the number of impact.

단계적 타격 스트로크 가변 메커니즘이 적용된 지능형 유압브레이커의 기술 제안 (Technique Proposal of Auto-Sensing Hydraulic Breaker with Stepwise Impact Stroke Variable Mechanism)

  • 이대희;노대경;이동원;장주섭
    • 드라이브 ㆍ 컨트롤
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    • 제15권2호
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    • pp.9-21
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    • 2018
  • The aim of this study was to develop and test a model of an auto-sensing hydraulic breaker that can automatically change its 4-step impact mode according to the rock strength using SimulationX. The auto-sensing hydraulic breaker with a 4-step variable impact mode has the advantage of obtaining optimal impact energy and impact frequency under various rock conditions compared to an auto-sensing hydraulic breaker with a 2-step variable impact mode, which has already been developed overseas. Several steps were necessary to conduct this study. First, the operation principle of the auto-sensing hydraulic breaker with the 2-step variable impact mode was analyzed. Based on the findings, an analysis model of the auto-sensing hydraulic breaker with the 4-step variable impact mode was developed (and compared with the 2-step variable impact mode) Finally, an analysis of the results established that the stepwise variable of the impact mode was implemented according to the rock strength and the difference of each impact mode was confirmed. This study is expected to contribute to the development of auto-sensing hydraulic breakers that are superior to those developed by advanced companies in foreign countries.

유한요소법을 이용한 유압브레이커 Cylinder와 Piston의 열-구조 연성해석을 통한 안정성 평가 (Assessment of Stability of Stability of Hydraulic Breaker Cylinder and Piston through Thermal-Structural coupled Field Analysis by Finite Element Method)

  • 임동욱;박윤수;신봉철
    • Design & Manufacturing
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    • 제12권1호
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    • pp.41-46
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    • 2018
  • This study proves the causes of cylinder and piston jam by scratches which is the fatal problem of hydraulic breaker through the thermal analysis and thermal-structural coupled field analysis. The trouble from the scratch is a complex problem which can be caused by manufacturing process (this is an internal factor) and the users mistake or contamination in the hydraulic circuit (these are an external factor). Hence, it's not easy to investigate the causes, also hard to prevent the recurrence. In this reason, hydraulic breaker manufacturers are trying to improve the manufacturing process such as machining, heat treatment, grinding, cleaning, also to prevent the contamination in hydraulic circuit and to remove the remains. It's being managed thoroughly by manufacturers. This study shows the effect of the temperature rise by the frictional heat generated when the piston hits the tool on the hydraulic oil while the hydraulic breaker is operating, also the temperature distribution when it starts to affect main components of hydraulic breaker. The stress and the amount of deformation also could be found through thermal-structural coupled field analysis. It proved that the stress and deformation are proportionally increased according to the temperature rise in hit area, and it affects the cylinder and the viscosity of hydraulic oil inside the cylinder when it heats up beyond the certain temperature.

유압브레커의 모델링 및 피스톤과 치즐간의 탄성충돌을 고려한 해석 (Modeling and Analysis of a Hydraulic Breaker Considering Elastic Impact between the Piston and the Chisel)

  • 고승환;임종혁
    • 대한기계학회논문집
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    • 제19권2호
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    • pp.338-347
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    • 1995
  • Equations of motion and continuity equations of a hydraulic breaker are derived. Hydraulic pressures are defined with 6 state variables corresponding to 6 control volumes. Impact analysis procedure of the piston and chisel is developed based on the finite element nodal displacement description. Computer simulation is performed with given design parameters and the results are compared with experimental results.

가스보조식 이중행정 유압브레이커의 성능 최적화 (Performance Optimization of a Gas-Assisted Hydraulic Breaker with Dual Stroke)

  • 류택직;장효환
    • 유공압시스템학회논문집
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    • 제7권1호
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    • pp.11-19
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    • 2010
  • A gas-assisted hydraulic breaker uses both hydraulic and pneumatic energies and the appropriate balance between them mostly effects its performance. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected, which mostly affect the performance of the breaker. Taguchi method is used to optimize the key design parameters to maximize the output power for long and short strokes through simulation. As the result, the output power as well as the impact energy are increased significantly compared with the existing design. The pressure pulsation in the supply line is reduced to a tolerable level and the dynamic characteristics of the piston displacement is also improved by the optimization.

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Taguchi 방법을 이용한 순수 유압식 브레이커의 성능 최적화 (Performance Optimization of a Fully Hydraulic Breaker using Taguchi Method)

  • 곽광순;장효환
    • 유공압시스템학회논문집
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    • 제5권3호
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    • pp.1-8
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    • 2008
  • The optimal design of a large-size fully hydraulic breaker is studied in this paper. Mathematical modeling of the breaker is established and verified by experiments. Through sensitivity analysis, the key design parameters of the breaker are selected, which mostly affect the performance of the breaker. Taguchi method is used to optimize the key design parameters in order to maximize the output power through simulation using AMESim. As a result, the impact energy is increased by 18.9% and the output power is increased by 12.4% compared with the current design. The pressure pulsation in the supply line is also reduced by the optimization.

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브레이커 소음측정시스템을 활용한 소음의 측정 및 평가 (Measurement of Breaker Noise by Using Breaker Noise Measurement System)

  • 이재원;강대준;구진회;박형규
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.1173-1176
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    • 2007
  • The breaker noise is one of the main noise sources of construction site. It is very important to assess and measure the breaker noise accurately, because the noise labelling will be in effect January 2008 in Korea. Therefore, It is necessary to measure the sound power level of breakers and use a appropriate test method in accordance with international standard. In this study, we measure the sound power level of breakers by using the breaker noise measurement system. This system makes it possible to measure the breaker noise more accurately than to measure the noise of that attached with excavator, because this system can control main factors affecting breaker noise such as hydraulic input power, hydraulic supply pressure, breaker inlet oil flow and so on.

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유압 브레이커의 충격량 예측을 위한 모델링과 해석 (Modeling and Simulation for Predicting the Impact of Hydraulic Breaker)

  • 김성현;정재호;백동천;박종원
    • 한국산학기술학회논문지
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    • 제20권2호
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    • pp.741-749
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    • 2019
  • 굴삭기에 부착되는 유압 브레이커는 건물의 파괴 및 분해, 도로 포장재의 파손, 채석장에서의 암석 파단 등에 사용되고 있는 부착작업기의 일종의 건설 장비이다. 따라서 유압브레이커의 성능은 주로 충격량 및 충격 효율에 의해 평가되며, 이는 제조사 및 사용자 모두에게 중요한 요소이다. 본 논문에서는 건설 현장에서 주로 사용되는 20톤급 유압브레이커를 대상으로 상용 프로그램인 SimulationX를 사용하여 유압밸브 및 피스톤의 수압 면적 또는 작동 조건에 따라 유압 브레이커의 충격량 예측을 위한 모델링 및 해석을 진행하였다. 또한, 모델링 및 해석의 신뢰성을 확인하기 위하여 기존 실험 연구의 결과를 통하여 비교 및 검증하였다. 본 연구 결과는 제작 이전의 설계 단계에서 유압 브레이커의 충격량을 예측하고 충격량 향상을 위한 파라미터 연구에 도움이 될 것으로 본다. 또한 제조사 측에서는 본 논문의 결과를 통하여 유압 브레이커의 충격량을 미리 예측함으로서, 시행 착오 방지를 통하여 개발 시간 및 비용을 절감할 수 있을 것으로 예측한다.

유한요소해석을 이용한 유압브레이커용 우레탄 패킹의 성능분석 (Performance Analysis of Urethane Packing in the Hydraulic Breaker by a Finite Element Method)

  • 신현우;홍종우;최이광
    • 한국정밀공학회지
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    • 제33권2호
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    • pp.139-147
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    • 2016
  • Performances of urethane packing in the hydraulic breaker were analyzed using a finite element method. Because of high temperature and high pressure in the hydraulic breaker, it is better to use urethane rather than rubber as a packing material. We obtained the physical properties of urethane at elevated temperature by the tensile test. We analyzed buffer seal and U-packing maintaining the pressure and preventing oil leakage. Deformation, stress distribution, contact length, contact pressure of packing at each pressure step were obtained using finite element analysis. As the temperature increases, stress and contact force tend to decrease at low pressure. As the gap between piston and cylinder increases, contact length and contact forces decrease. Consequently, it is possible to design the packing section using these analyses, and construct a system to predict the possibility of oil leakage in the hydraulic breaker.

유압 브레이커의 리턴 라인의 압력 맥동 감소에 관한 연구 (A Study on the Reducing the Return Line Pressure Fluctuation of the Hydraulic Breaker System)

  • 성원준;노태봉;송창섭
    • 한국정밀공학회지
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    • 제20권9호
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    • pp.70-76
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    • 2003
  • In this study, the hydraulic breaker system was analyzed and simulated using. The simulation result was certified comparing with the experimental result. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the method to reduce the return line pressure fluctuation was presented.