• Title/Summary/Keyword: Screw conveyor

Search Result 16, Processing Time 0.145 seconds

Model test on operation efficiency in the screw conveyor of shiled TBM in soft ground (축소모형시험을 통한 연약지반 shield TBM의 screw conveyor 배토효율에 관한 연구)

  • Oh, Tae-Sang;Kim, Sang-Hwan;Kim, Won-Kyung;Lee, Hye-Yoon;Shin, Min-Ho
    • Journal of Korean Tunnelling and Underground Space Association
    • /
    • v.16 no.2
    • /
    • pp.203-211
    • /
    • 2014
  • This paper presents the screw conveyor operation efficiency of shield TBM in soft ground. In order to study the screw conveyor operation efficiency, the experimental and theoretical studies were carried out. In experimental study, the operating amounts of muck were examined and compared due to the screw conveyor operating parameters including types (Shaft and Ribbon screw), angles of screw and conveyor. The results obtained from the laboratory model tests were analysed and evaluated to suggest the most suitable muck operating parameters during the shield TBM tunnelling in soft ground. In conclusion, it is found the operation parameters to increase the screw conveyor efficiency. In addition, the information presented in this paper may be useful for developing the design technology of shield TBM in the future.

DEM-based numerical study on discharge behavior of EPB-TBM screw conveyor for rock (EPB-TBM 암반굴착시 스크류컨베이어의 배토 거동에 대한 DEM 기반 수치해석적 연구)

  • Lee, Gi-Jun;Kwon, Tae-Hyuk;Kim, Huntae
    • Journal of Korean Tunnelling and Underground Space Association
    • /
    • v.21 no.1
    • /
    • pp.127-136
    • /
    • 2019
  • Tunnel construction by TBMs should be supported by the performance of a screw conveyor in order to obtain the optimum penetration rate, so studies related to the screw conveyor performance have been being conducted. Compared to the study on the performance of the screw conveyor for the soil, however, the research on the performance of the screw conveyor for the rock is insufficient. Considering the domestic tunnel sites with more rock layers than soil layers, simulation of discharge of 6 types of rock chips by the screw conveyor was conducted using DEM. Regardless of the shape and volume of the rock chips, the discharge rates of the rock chips by the parallel placed screw conveyor at a speed of 10 RPM in the same rock mass were about 20% (standard deviation: 1.3%) of the maximum volume of discharge rate by the screw conveyor. It is expected that this study can be used as a reference material for screw conveyor design and operation in TBM excavations in rock masses.

An experimental study on screw conveyor system of EPB shield TBM (EPB Shield TBM의 스크루 컨베이어 시스템에 관한 실험적 연구)

  • Kim, Sang-Hwan;Kim, Jin-Dae;Park, Inn-Joon
    • Journal of Korean Tunnelling and Underground Space Association
    • /
    • v.13 no.6
    • /
    • pp.519-530
    • /
    • 2011
  • The screw conveyor system installed in EPB Shield TBM chamber was manufactured in small scale for pilot test to investigate the tunnel muck hauling system that could control the earth pressure and support face thrust force. In this experimental study, there were three different test conditions that include screw angles, screw pitch, and screw RPM. Through analysis on test results based on the muck hauling amount per unit time from screw conveyor, the optimum conditions of screw conveyor were proposed to be efficiently performed by the muck processing system. Finally, this study provided the meaningful results such as optimum screw angle, screw RPM, and screw pitch for anti-reverse flow of muck hauling.

A Study on Design of Small Type Screw Decanter using Commercial Analysis Tool (상용해석 툴을 이용한 소형 스크류 디캔터의 설계에 관한 연구)

  • Kim, Y.S.;Kim, J.T.;Yang, S.Y.
    • Journal of Drive and Control
    • /
    • v.11 no.4
    • /
    • pp.46-52
    • /
    • 2014
  • This study suggests a small-sized screw decanter specialized for dredging sites. Generally, conventional screw decanters are composed of a cylinder and a cone. However, the suggested screw decanter simply has a cone based on a cone-type bowl structure. In this research, a commercial analysis tool is used to establish an optimal design for the bowl and the screw conveyor. Moreover, the base frame, where the main bearings that support the spindle of the bowl and the screw conveyor are installed, is optimally designed considering the weight of the rotating body and the deflection caused by the high centrifugal force. Furthermore, the natural frequency range of the spinning body, the bowl and the screw conveyor, is applied to this base frame; it is designed not to correspond to the resonance frequency range and achieves stability as a result. This study suggests an optimal design for the rotating body and the base frame of a screw decanter considering its vibration characteristics. Such a design will prevent overuse of materials and help to reduce the weight and volume-and the price-of a screw decanter.

Evaluation of Screw Conveyor Model Performance depending on the Inclined Angle by Discrete Element Method (개별요소법을 활용한 경사각에 따른 스크루 컨베이어 모델 성능 평가)

  • Park, Byungkwan;Choi, Soon-Wook;Lee, Chulho;Kang, Tae-Ho;Chang, Soo-Ho
    • Tunnel and Underground Space
    • /
    • v.29 no.6
    • /
    • pp.379-393
    • /
    • 2019
  • For the economical construction of a tunnel by TBM, the selection of TBM optimized with the various project conditions is important, and also necessary to predict the performances of selected TBM in advance. This study was conducted to comprehensively evaluate the performance of the EPB shield TBM screw conveyor by the discrete element method. The sticky particles were used for the excavated material models, and screw conveyor with 11 different inclined angles were simulated to evaluate the performance depending on the different inclined angles. The four different rotational speed conditions of the screw were used, and torque, required power, extra energy for muck discharge, and the muck discharge rate were selected as four performance indicators. As a result, the optimized inclined angle was selected, and selected angle accords with the fact that EPB shield TBM screw conveyor is generally installed and adjusted at the inclined angle between 20.0° and 30.0° in the field.

A Treatability Study on the Soil Washing Device for the Remediation of Oil-Contaminated Soil (유류 오염토양 복원을 위한 토양세척 장비의 적용성 연구)

  • Kong, Jun;Choi, Sang-Il
    • Journal of Korea Soil Environment Society
    • /
    • v.3 no.3
    • /
    • pp.109-116
    • /
    • 1998
  • Treatability tests of a soil washing device were performed for the remediation of eil-contaminated soil. The contaminant-containing soil with water was first fed into a oc-current screw conveyor and then into a counter-current washer. Surfactant was introduced into the washer and feeding soil was continuously separated on the basis of #40 mesh at the same time. A washing efficiency of 97.9% was achieved by the the soil washing device optimized.

  • PDF

Development and Verification of the Automated Cow-Feeding System Driven by AGV (무인이송로봇기반 자동 소사료 공급 시스템 개발 및 검증)

  • Ahn, Sung-Su;Lee, Yong-Chan;Yoo, Ji-Hun;Lee, Yun-Jung
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.18 no.3
    • /
    • pp.232-241
    • /
    • 2017
  • This paper presents an automated cow-feeding system based on an AGV and screw conveyor for domestic livestock farms, which are becoming larger and more commercialized. The system includes a hopper module for loading pellet-type mixed feed at the top of the system, a transfer module mounted with a screw conveyor to transfer feed from the hopper module to the outlet module, an outlet module composed of belt conveyors, and an electromagnetic guided driving-type AGV. The weight of the loaded feed is measured by a load cell located under the transfer module. The system reads the feed discharge information stored in RFID tags installed in each cowshed cell, and a predetermined amount of feed is discharged while the AGV is moving. A cow-feed test system was constructed to determine the design parameters of the screw conveyor in the transfer module that determine the feeding capacity. These parameters include the screw's outer diameter, the screw shaft outer diameter, and screw pitch. The parameters were applied to the finalized cow-feed system construction. A DSP-based main controller and cow-feeding algorithm for different scenarios were also developed to control the system. Experimental results confirmed that the system could supply a total of 21 kg of feed uniformly at 420 g/s for a cowshed cell which has 7 cows. The driving distance was 5 m and the speed was 0.1 m/s. Thus, the proposed system could be applied to standardized domestic livestock farms.

Development of a Rice Seed Pelleting Machine for Direct Seeding in Rice Cultivation (직파용 벼 펠렛종자 제조장치 개발)

  • 박종수;유수남;최영수;유대성
    • Journal of Biosystems Engineering
    • /
    • v.27 no.5
    • /
    • pp.381-390
    • /
    • 2002
  • Direct seeding of rice-seed pellets is expected to be an alternative for solving problems in current direct seeding cultivation of rice. but mass production of rice-seed pellets is prerequisite for practical application. Design. construction and performance evaluation of an experimental rice seed pelleting machine were carried out for mass production of rice-seed pellets. The pelleting machine intended to make a ball type rice-seed pellet, which have 3∼5 rice seeds and diameter of which is 12 mm. Pellet materials ; rice seeds, soil, and binder were mixed and kneaded by the mixer. The designed rice seed pelleting machine fed pellet materials by screw conveyor to forming rolls and made rice-seed pellets. Capacity, ratio of perfect rice-seed pellets, seed and pellet material loss were investigated as mixing ratio of soil to rice seed and feeding rate of pellet materials. The pelleting machine showed up to 37,000 pellets/h of pelleting rate, 61∼71% of weight ratio of perfect rice-seed pellets to pellet materials supplied, 17∼48% of seed loss ratio. Average weight and average diameter of the pellets were 1.66 g and 12.0 mm. respectively. More than 3 rice seeds were included in most pellets at 6 : 1 of mixing ratio of soil to rice seed. And compression strength of the pellets was in the range of 88-130 N. To improve performance of the pelleting machine, improvements of the forming rolls, feeding mechanism, and discharging mechanism for reducing loss of pellet materials and seeds damage are needed.