Abstract
The article discusses the mechanisms of walking used on dragline excavators. The disadvantages of each mechanism are identified and based on this, the most promising movement mechanism is selected – a three-legged walking mechanism with a hydraulic drive. For this mechanism, the main disadvantages are also identified. The following is a technical solution that allows you to save this mechanism from the main drawback – the need to raise the center of mass of the excavator to a significant height to ensure the maximum step value. The technical solution includes the presence of a flat hydrostatic support that allows to increase the efficiency of the mechanism in open-pit mining operations. The calculation of oil consumption through a flat hydrostatic support in the conditions of its use on quarry soils with different bearing capacity is made.
Highlights
One of the most effective ways to conduct overburden operations is a transportless technology with the use of dragline excavators on a walking course
To calculate the oil consumption of a flat hydrostatic bearing, a method has been developed for a stable gap formed by the oil supply between the contacting planes[9, 10]: Q
Our case of using a hydrostatic bearing does not allow us to apply this calculation due to the deflection of the support shoes when moving over the roughness of the quarry ground, since the value of the resulting deflection depends on the size of the gap between the sliding surfaces, which leads to an increase in the flow of lubricating fluid through the flat hydrostatic bearing
Summary
One of the most effective ways to conduct overburden operations is a transportless technology with the use of dragline excavators on a walking course. The use of singlebucket excavators for excavating soil dates back to 1832-1836 in the United States during the creation of the Otis steam single-bucket excavator. The movement mechanism was modernized, the requirements for the speed of movement and the ability to move on various soils increased. The mechanism of movement was improved over time from the railway to the walking course [1]. The walking undercarriage meets the main requirementsit provides a low specific pressure on the ground with huge masses of the excavator, is reliable in operation and provides a fairly high speed of movement
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