Compact Excavator Research Articles

Construction project of a long reach compact excavator

The purpose of thesis was to comprehensively develop the construction project of a long reach compact excavator. Optimal solution was selected and its frames were determined by carrying out classic structural calculations. Then, based on them, a preliminary three-dimensional model was designed in the CAD environment. The prototype was subjected to a series of verification calculations and simulation tests using the finite element method under typical, but also non-standard operating conditions. Then, the structure was optimized and then tested again. Next, technical documentation of the final version was created. In the final part of work, technical and operational parameters of designed compact excavator were summarized and the direction of further actions was determined. The thesis ended with a summary of the observations arose during its implementation.

Development of a compact excavator mounted dust suppression system

This paper reports on the investigation of an excavator mounted dust suppression system for demolition and construction activities. Ever increasing pressure is placed on contractors to improve their environmental performance, especially dust emissions. Current methods of dust suppression have been investigated and each of the methods has also been critically analysed to determine their advantages and disadvantages. The investigation also examined the requirements of such a system and a concept system proposal was produced. A working prototype has been constructed for a mini excavator complete with a hydraulic breaker. The proposed system was rigorously tested in various configurations to determine its efficiency and effectiveness in comparison with current suppression techniques. The resulting benefits such as the reduction of water usage and cost are highlighted.

굴삭기 버킷 회전부의 응력해석

Abstract: In mining and its similar industries, compact excavators are used commonly in narrow working spaces, of which bucket must be rotated essentially. Considering of those applications, many kinds of the compact excavators have been developed, but any stress evaluation of bucket rotating part had not been attempted. In this study, using of the finite element method and Spare solver, stress analysis has been per-formed on the bucket rotating parts and its adjacent parts of compact excavator, with using an excavation stress model, in various directions and positions. Resultantly, it has been defined that stress of connector in the rotating part is a little higher, due to its shape, than those remained parts of which stress are shown equally as 1 MPa. Especially in the moving parts, the stress of bucket pin and rotating pinion gear has been calculated as 7.7 MPa and 40 MPa respectively. Keywords: Compact Excavator, Bucket, Rotating Parts, Stress Analysis 1.서 론 소형 굴삭기는 정격하중 3톤 미만의 굴삭기로 버킷 적제용량은 0.02 ~ 0.1

소형 굴삭기용 브리드 오프 센터형 유압 제어 시스템의 특성

In this study, the characteristics of the hydraulic control system with bleed-off center type of a compact excavator were analyzed using developed analysis program. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the system parameter effects on the controllable region and the pump pressure and load pressure variations were studied. The results were compared with the experimental ones. The results and discussions of the present paper could aid in the performance improvement of a hydraulic control system of a compact excavator.

Zurich – a new terminal under the main train station

The various public transportation systems are concentrated in and around Zurich's Main Train Station. It is the most important transit point in Switzerland. The railway authority predicts a significant increase in traffic over the next few years. The existing tracks of Zurich's Main Train Station will not be able to cope with this growth. That is why, the realization of the train station Loewenstrasse is impatiently awaited in 2013. The placement of the new transit station 16 m below the Main Station results in the best solution for assuring short transfer connections. This will require tunnelling under existing tracks as well as two other subsurface obstacles: a river and a future highway tunnel. The Loewenstrasse station is designed with four tracks comprising of two 420 m long median platforms. The intermediate floor, above the new platform level, contains the transit ways for the rail passengers. These are meant to be used commercially and will result in attractive shopping opportunities. The operation of the Main Train Station must not be disturbed during any of the construction activities. Furthermore, none of the tracks may be blocked after 2004, since all 20 tracks within the hall will be needed for scheduled rail traffic. This necessitates the use of the top-down construction method plus the early construction of particular portions of the future station. For this first construction phase, the site will dispose of two surface tracks and a platform with a width of 9 m. Logistics will be rendered more difficult due to the island configuration of the site, which can only be accessed across the tracks. The foundations of the medial supports pose an unusual challenge. These carry the top slab upon which the above-ground tracks and platforms are positioned. These involve solid steel struts connected to the top of diaphragm piles. Due to the high load impacts and the need for very precise placement, special solutions were developed to assure proper load transfer of the diaphragm elements by the solid steel struts. In the middle section of the station, the surface tracks cross over a river. Subsequent construction work will be performed out of the river bed under the bridges so as not to impede train operations. The dried-out excavation will allow the drilling of micro piles as a temporary foundation for the railroad bridges. The lateral diaphragm walls can be trenched using a special compact excavator. The top-down construction must therefore be executed under ground. (A). Reprinted with permission from Elsevier. For the covering abstract see ITRD E124500.