The equipment in underground mines provides a continuous production flow, depending on the way their quality is preserved during operation. TR-7A scraper conveyer subassemblies, which function Jiu Valley coal basin and are subjected to abrasion wear, showed high failure frequency (chains, chain elevators, driving turning drums), as well hydraulic couplings certain electric of same machinery. da...

The present hydraulic variable-pitch mechanism of wind turbine uses three hydraulic cylinders to drive three crank and connecting rod mechanisms respectively; the blades are moved with the cranks. The hydraulic variable-pitch mechanism has complex structure, occupies a lot of space and its maintenance is trouble. In order to make up for the shortcomings of hydraulic cylinder variable-pitch syst...

Abstract For the high head pump turbine, unit instability during its operation mainly dues to hydraulic vibration inside machinery, which will cause mechanical fatigue failure under certain circumstances. In this paper, flow pattern and runner axial water thrust in turbine model partial load were analyzed by numerical simulation. The internal field vortex characteristics of obtain reasons for d...

WC-Cr3C2-Ni coatings are a vital class of hard ceramic/cermet with potential applications as wear-resistant materials. However, their erosion wear behavior in 3.5 wt.% sodium chloride medium (SCM) remains largely unexplored. The present study investigated the cavitation–silt (CSE) SCM sprayed high-velocity oxygen–fuel (HVOF) under different flow velocities (FVs) and sand concentrations (SCs). C...

Generally, during the accelerating process of construction machinery large inertia hydraulic swing system, a lot kinetic energy is accumulated, and it will be eventually dissipated through relief valve orifice decelerating process, which results in serious waste overflow loss. In order to solve this problem, new dual source motor with non-uniform flow distribution proposed, can drive high-frequ...

[1] Hydraulic tomography is a cost-effective technique for characterizing the heterogeneity of hydraulic parameters in the subsurface. During hydraulic tomography surveys a large number of hydraulic heads (i.e., aquifer responses) are collected from a series of pumping or injection tests in an aquifer. These responses are then used to interpret the spatial distribution of hydraulic parameters o...

Traditional construction machinery has the disadvantages of low energy efficiency and poor emissions, which do not meet requirements environmentally friendly industrial development. Electric attracted more attention because its advantages zero emissions high efficiency, are considered to be important factors in future development machinery. Preliminary attempts introduce electric motors into us...

INTRODUCTION: The calculation of Manning n values has been of interest since the Manning equation was presented in the late 1800s (Henderson, 1966). While estimation of n vahm for normal channels has been fairly well standardized, the estimation of n values in areas of dense vegetation continues to be subject to large variations depending on the experience of the engineer and the perceived dens...