• Title/Summary/Keyword: 이송장치

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Smoothed Particle Hydro-dynamic Analysis of Improvement in Sludge Conveyance Efficiency of Screw Decanter Centrifuge (입자 완화 유체 동역학 해석 기법을 이용한 스크류 디켄터형 원심분리기의 슬러지 이송 효율 향상 분석)

  • Park, Dae Woong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.39 no.3
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    • pp.285-291
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    • 2015
  • A centrifuge works on the principle that particles with different densities will separate at a rate proportional to the centrifugal force during high-speed rotation. Dense particles are quickly precipitated, and particles with relatively smaller densities are precipitated more slowly. A decanter-type centrifuge is used to remove, concentrate, and dehydrate sludge in a water treatment process. This is a core technology for measuring the sludge conveyance efficiency improvement. In this study, a smoothed particle hydro-dynamic analysis was performed for a decanter centrifuge used to convey sludge to evaluate the efficiency improvement. This analysis was applied to both the original centrifugal model and the design change model, which was a ball-plate rail model, to evaluate the sludge transfer efficiency.

Study on Simulation and Calculation Method of Thermal Error Compensation System for a Ball Screw Feed Drive (볼 스크류 이송장치 열 에러 보상 시스템의 시뮬레이션 및 계산 방법에 관한 연구)

  • Xu, Zhe Zhu;Choi, Chang;Kim, Lae-Sung;Baek, Kwon-In;Lyu, Sung-ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.2
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    • pp.88-93
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    • 2017
  • Due to the requirement of the development of the precision manufacturing industry, the accuracy of machine tools has become a key issue in this field. A critical factor that affects the accuracy of machine tools is the feed system, which is generally driven by a ball screw. Basically, to improve the performance of the feed drive system, which will be thermally extended lengthwise by continuous usage, a thermal error compensation system that is highly dependent on the feedback temperature or positioning data is employed in the machine tool system. Due to the overdependence on measuring technology, the cost of the compensation system and low productivity level are inevitable problems in the machine tool industry. This paper presents a novel feed drive thermal error compensation system method that could compensate for thermal error without positioning or temperature feedback. Regarding this thermal error compensation system, the heat generation of components, principal of compensation, thermal model, mathematic model, and calculation method are discussed. As a result, the test data confirm the correctness of the developed feed drive thermal error compensation system very well.

Optimum Design for the Frame of the Shuttle Car for LMTT to transfer a Container (컨테이너 이송을 위한 LMTT용 셔틀 카의 프레임 치수최적설계)

  • Han, Dong-Seop;Han, Geun-Jo;Lee, Kwon-Hee;Shim, Jae-Joon;Lee, Seong-Wook
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.29 no.1
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    • pp.429-432
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    • 2005
  • LMTT(Linear Motor based Transfer Technology) is a new type of transfer system used in the maritime container terminal for the port automation, and largely consists of a controller, shuttle car, and rail. The shuttle car is divided into the frame part, the driving part, and wheels. In order to design this system, various researched on each part of it must be conducted. In this study, we dealt with the optimum design for the frame part of the shuttle car designed from previous studies on the strength of the frame with respect to the number of cross beams to minimize the weight of the shuttle car and to satisfy design criteria of cargo-handling systems in container terminal. For the optimization of the frame, thicknesses of each beam were adopted as design variables, the weight of the frame as objective function, and stress and deflection per unit length as constraint conditions.

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Six Sigma based on Robust Design of Gripper for LCD Transfer System (LCD 이송장치의 그립퍼부 시그마 기반 강건설계)

  • Chung W.J.;Jung D.W.;Kim H.J.;Yoon Y.M.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.361-362
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    • 2006
  • This paper presents the robust design of gripper part for a high-speed LCD (Liquid Crystal Display) transfer system. In this paper, the 1st DOE (Design of Experiment) is conducted to find out main-effect factors fur the design of gripper part. Thirty-six experiments are performed using $ANSYS^{(R)}$ and their results are statistically analyzed using $MINITAB^{(R)}$, which shows that the factors, i.e., First-width, Second-width, Rec-width, and thickness of gripper part, are more important than other factors. The main effect plots shows that the maximum deflection and mass of gripper part are minimized by increasing First-width, Second-width, Rec-width and thickness. The 2nd DOE is conducted to obtain RSM (Response Surface Method) equation. The CCD (Central Composite Design) technique with four factors is used. Optimum design is conducted using the RSM equation. Genetic algorithm is used for optimal design. Six sigma robust design is conducted to find out a guideline for control range of design parameter. To obtain six sigma level reliability, the standard deviations of design parameters are shown to be controlled within 5% of average design value.

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Implementation of Wireless Micro-Magnetic Detection System in the Conveyer Belt (컨베어 이송장치에서의 무선 미소자기감지 시스템 구현)

  • Lee, Young-Dong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.12
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    • pp.2975-2981
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    • 2014
  • Micro-magnetic detection system is used to detect small particles in an automatic transmission valve body, which signal noise and time-delay may occurs in process of signal transmitting and filtering. In this paper, we present the design and implement of a micro-magnetic detection system based on wireless sensor networks in conveyer belt. Micro-magnetic detection system consists of five modules which are magnetic sensor detector, signal processing unit, wireless sensor networks, system control unit and system monitoring unit. Our experimental results show that the proposed wireless micro-magnetic detection system improves both accuracy and time delay compared to the wired system; therefore, it may apply for wireless micro-magnetic detection system by analysis of packet reception rate.

Development of Transporter for Marine Leisure Ship with Safety and Operation Support System (안전·운용 지원 시스템을 적용한 해양레저선박 이송장치 개발)

  • Kim, Bae-Sung;Hwang, Hun-Gyu;Yoon, Sung-Won;Kim, Tae-Yeob;Kang, Jong-Lin
    • Journal of Ocean Engineering and Technology
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    • v.33 no.5
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    • pp.486-494
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    • 2019
  • Recently, the interest in marine leisure activities has been growing rapidly with the work-life balance trend. In response to this demand, the Korean government is supporting fostering and revitalizing the relevant industries and facilities. In particular, a marina has been making efforts to change itself into a resort with multiple amenities instead of a simple mooring facility. However, the facilities in a marina for the transport of marine leisure equipment mostly consist of cranes and boat-lifts using ropes, which can result in incidents such as damage and accidents during lifting or movement. This paper proposes the equipment and support system for the safe transportation of marine leisure ships. Aluminum transport equipment was designed by performing a structural analysis to achieve a lighter weight than the existing steel products. In addition, a safety support system with alarms for tilting or obstacles and a slope monitoring system was developed to enhance the safety during operation and transportation. The safety support system developed in this study was implemented and installed in the transport system, and verified through commissioning on land.

A study on Optical Element Pick-up Mechanism of Ultrasonic Transport System (초음파 이송 장치의 광소자 픽업 메커니즘에 관한 연구)

  • Jeong S.H.;Kim G.H.;Shin S.M.;Lee S.H.;Kim J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.327-328
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    • 2006
  • Recently, as the infocomindustry is developed, the semiconductor industry as well as the optical industry such as the optical communication and the optical instrument is developed rapidly. The transmission, storage and processing of information has been reaching an limit because amounts of information increase rapidly. The more quickly the optical communication is developed, the more sharply the demand of optical elements increase. The transport and inspection process is time consuming and the error rate is high, because this process are not automated in case of an optical lens. In this paper, the pick-up system that can hold optical elements and be transferred by the ultrasonic transport system is developed. The inspection system that distinguishes between the existence and the nonexistence of a defect is connected easily to pick-up system. The pick-up system separates the optical glass lens by results of the inspection. The automation program is developed by visual c++ programming.

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Fabrication of a Micro Fluidic Device for Micro-FACS and Test of Electroosmosis (Micro-FACS용 미세 유첼 소자의 저작 및 전기삼투 구동 시험)

  • Choi, Eun-Soo;Kim, Geun-Young;Park, Tae-Gyu;Yang, Sang-Sik
    • Proceedings of the KIEE Conference
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    • 2001.11a
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    • pp.69-71
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    • 2001
  • 본 논문에서는 FACS(fluorescence activated cell sorting)의 초소형화를 위한 미세 유체소자들을 플라스틱 기판에 집적하여 제작하고 전기삼투를 이용해서 세포가 일렬로 이송되는 특성을 시험한다. 제작된 미세 유체 소자는 유리 하부 기판과 플라스틱 상부 기판 및 전원장치로 구성된다. 상부기판은 세포를 주입하기 위한 샘플 측 레저버와 세포를 운반 및 일렬 이송이 가능하게 하는 버퍼를 저장할 두 개의 레저버가 있고 이들이 배출되는 레저버로 구성된다. 마이크로머시닝 기술을 이용하여 실리콘 기판 위에 미세 채널 몰드를 제작한 후 PDMS(polydimethylsiloxane)로 주물을 제작한다. $O_2$ 플라즈마를 이용하여 유리 기판과 PDMS 주물을 접합하며 제작된 채널에 적색 잉크와 bead를 샘플 측에 충전하고 버퍼 측에 sodium borate를 충전한 후 전기삼투로 구동시킨다. bead가 일렬로 이송되도록 전장을 조절하고 이때의 유속과 유량을 측정한다. 다양한 전장에 따른 실험을 통하여 채널의 구조를 최적화한다.

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플라즈마 연질화 처리된 마이크로 구동 요소부품의 표면미세구조 변화

  • Lee, Sang-Min;An, Gyeong-Jun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2013.05a
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    • pp.125-125
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    • 2013
  • 기계부품 및 자동차부품 등의 내마모나 내피로성의 향상을 위한 표면처리로서 고주파처리, 침탄처리, 질화처리 등이 사용되고 있다. 최근에는 변형을 최소화 함으로써 후가공을 생략할 수 있는 질화처리가 주목받고 있다. 질화처리종류로는 염욕질화나 가스질화법이 사용되고 있으나, 이들에 비해 환경오염 및 공해가 적고 인체에 무해한 플라즈마 연질화법이 사용되고 있다. 플라즈마 연질화 기술은 IT기기의 제품에 적용되는 표면경화의 공정개발은 미비한 실정이다. 마이크로 구동 요소 부품중의 하나인 Leadscrew는 이송장치를 구성하는 핵심 부품으로 IT기기의 정밀 이송 및 구동제어에 사용되는 핵심 부품으로 사용되고 있으며, 리드스크류의 소재인 SWCH1018A(냉간압조용강선)은 표면 경도가 낮고 변형이 쉽기 때문에 표면 경화를 위한 플라즈마 연질화 기술을 이용하고자 했다. 본 연구는 플라즈마 연질화 공정을 적용한 시편의 표면경도를 높혀주고 변형을 최소화 할 수 있는 공정을 확인하는 것이다. 공정변수를 변화 시키면서 얻어진 시편의 표면미세 구조를 미소경도측정, XRD, SEM분석을 통하여 확인하였으며, 이를 통해 시편 표면경도를 높여주는 공정 조건을 도출하였다.

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Development of Feeding System by Micro Particle Powder (마이크로 미립 이송시스템 개발에 관한 연구)

  • 박정수
    • Journal of Korea Society of Industrial Information Systems
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    • v.8 no.3
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    • pp.105-110
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    • 2003
  • The purpose of this paper is to development of micro particle powder feeding systems for the reduction of air leakage of the feeding system. Most of the powder-granule supply systems using compressed air supply have a large amount of air leakage interference. The results of this study lead to reduce air leakage rate by over 50% and to save production cos by. 60%.

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