Synergy of surface textures on a hydraulic cylinder piston

2019 ◽  
Vol 14 (4) ◽  
pp. 424-429 ◽  
Author(s):  
Ying Zhang ◽  
Liangcai Zeng ◽  
Zhenpeng Wu ◽  
Xianzhong Ding ◽  
Kuisheng Chen
Keyword(s):  
Hydraulic Cylinder ◽  
Surface Textures ◽  
Cylinder Piston

The Double Role Piston Pump Based on the Symmetrical Gears and Crank-Link-Slider Mechanism Driven by Servo Motor

2011 ◽  
Vol 121-126 ◽  
pp. 2308-2312
Author(s):  
Ming Di Wang ◽  
Qiang Song ◽  
Kang Min Zhong
Keyword(s):  
High Speed ◽  
Noise Pollution ◽  
Hydraulic Cylinder ◽  
Piston Pump ◽  
Servo Motor ◽  
Straight Line ◽  
Wide Range ◽  
Cylinder Piston ◽  
High Speed Rotation ◽  
New Type

The double role piston pump based on the symmetrical gear and crank-link-slider mechanism driven by servo motor is innovated, its working principle and technical characteristics are introduced. In this new type of piston pump, the hydraulic cylinder piston is drived, and the velocity can be adjusted, but the flow pulse of a single pump is undoubtedly great. So two piston pumps are adopted, whose velocity are controled by NC, then the variable stepless timing in wide range can be achieved. If the velocity in this two pumps |v1|+|v2|=C (C is a constant), the flow curve of two pumps will be coupled into a straight line, in order to achieve constant flow output without the need of complex and inefficient throttle controlling loops, and there has not any power machines and mechanical parts in high-speed rotation ,and the noise pollution is very low. According to the varied circumstance, the high and low pressure conversion can be achieved when the angle velocity in this piston pump is controlled by the instructions. It is also very easy to achieve the dynamic and intelligent control.

Experimentally Validated Models of O-Ring Seals for Tiny Hydraulic Cylinders

2014 ◽  
Author(s):  
Jicheng Xia ◽  
William K. Durfee
Keyword(s):  
Simulation Models ◽  
Hydraulic Cylinder ◽  
Operating Conditions ◽  
System Level ◽  
Needle Valve ◽  
Hydraulic Systems ◽  
System Level Simulation ◽  
Piston Seal ◽  
Cylinder Piston ◽  
Hydraulic Cylinders

To enable simulation of tiny hydraulic systems, including predicting system efficiency, it is necessary to determine the effect of the hydraulic cylinder piston seal. For tiny cylinders whose bore is less than 10 mm, O-ring seals are convenient. Simplified models for the O-ring were used to describe piston leakage and friction and based on the models, the force and volumetric efficiencies for tiny cylinders were predicted for a range of steady state operating conditions. To validate the models, a test stand was constructed to collect experimental data for 4, 6 and 9 mm bore cylinders, which were in the form of a vertical ram with a single O-ring seal. The ram was fully extended and put under load. A needle valve was then cracked to cause the ram to descend at different speeds. Pressure, load and velocity were recorded and the data used to calculate cylinder efficiencies, which were then compared to model predictions. The model and the experiment showed essentially zero leakage. The experimental force efficiency had good agreement with the model over a range of operating conditions. The study showed that simple O-ring models for tiny hydraulic cylinders suffice for building system level simulation models.

scholarly journals A model for determining the time of pointing a grip-cutting device of feller buncher machines on a growing tree

2021 ◽  
Author(s):  
А.В. Андронов ◽  
И.А. Зверев ◽  
О.А. Михайлов ◽  
Г.С. Тарадин
Keyword(s):  
Mathematical Model ◽  
Average Distance ◽  
Hydraulic Cylinder ◽  
Technological Equipment ◽  
Maximum Time ◽  
Cylinder Piston ◽  
Experienced Operator ◽  
Time Required ◽  
The Way

Исследование посвящено нахождению аналитической математической модели по определению времени наведения захватно-срезающего устройства на растущее дерево. В качестве известных параметров используются конструктивные размеры технологического оборудования, снятые с компоновочно-кинематических схем валочно-пакетирующих машин, требуемая высота пня и среднее расстояние между деревьями пасики. Поиск требуемой модели кратко можно разделить на несколько последовательных этапов: нахождение пути, который пройдет шток гидроцилиндра привода стрелы, и по известной формуле скорости перемещения поршня гидроцилиндра находится время на подвод стрелы к дереву; нахождение пути, который пройдет шток гидроцилиндра привода рукояти; нахождение пути, который пройдет шток гидроцилиндра привода наклона захватно-срезающего устройства; нахождение пути, который пройдет шток гидроцилиндра привода рычагов захвата в процессе раскрытия. Сумма времени на подвод каждого из элементов технологического оборудования и есть время на наведение, присущее неопытному оператору, в случае опытного оператора время на наведение захватно-срезающего устройства к дереву определяется максимальным временем одного из компонентов. The research is devoted to finding an analytical mathematical model for determining the aiming time of a feller head on a growing tree. As the known parameters are used. The design dimensions of the technological equipment, taken from layout and kinematic diagrams of feller-buncher machines, the required stump height and the average distance between the trees of the windrow. The search for the required model can be briefly divided into several successive steps: finding the path that the hydraulic cylinder rod of the boom drive will take and by the known formula of speed of movement of the hydraulic cylinder piston is time to bring the boom to the tree; finding the way which the rod of the hydraulic cylinder of the arm drive; to find the path which the hydraulic cylinder rod of the tilt of the feller head; finding the path which the hydraulic cylinder rod for the arm actuator will take during the opening. The sum of the time for supplying each of the elements of technological equipment is the time required for the orientation, which is characteristic for a nonexperienced operator. In case of an experienced operator the time for setting the feller head to the tree is determined by the maximum time of one of the components.

scholarly journals STRESSED-DEFORMED STATUS OF THE HANGING HYDROCYLINDER: INFLUENCE OF THE CONJUGATED ELEMENTS’ PAIRS

2020 ◽  
Vol 17 (1) ◽  
pp. 44-56
Author(s):  
D. A. Potakhov
Keyword(s):  
Contact Interaction ◽  
Three Dimensional ◽  
Road Construction ◽  
Hydraulic Cylinder ◽  
Hydraulic Motor ◽  
The Road ◽  
Spatial Design ◽  
Urgent Task ◽  
Cylinder Piston ◽  
Hydraulic Cylinders

Introduction. The contact interaction of the associated elements of the hydraulic cylinder (piston with sleeve, guide sleeve with cylinder and rod) determines the reliability of the reciprocating hydraulic motor. Assessing the effect of gaps of articulated hydraulic cylinder elements is an urgent task in view of the fact that the formation of gaps is inevitable, since friction is always accompanied by tribological wear processes. The paper investigates the determination and assessment of the influence of the gaps of the hydraulic cylinders’ mating elements on the stress-strain state of the contacting bodies on the example of the hydraulic cylinder for the Sokol 80.01 railway crane.Materials and methods. The author used the finite element method implemented in the Simulation SolidWorks module. Moreover, the author applied the Huber–Mises criterion as a criterion for the material plasticity. The paper also considered theoretically possible spatial design schemes of loading and depending on the type of the mating elements’ contacting of the hydraulic cylinder.Results. As a result, the author presented plots and graphical dependences, which were three-dimensional surfaces constructed according to the results of numerical experiments. The calculations took into account the joint deformation of the piston, sleeve, rod, guide sleeve and supporting guide rings of the hydraulic cylinder. The author carried out the analysis of the obtained diagrams and dependences of the contact interaction of the hydraulic cylinder for various options of the elements contacting. The paper presented the results that were useful for studying all types of hydraulic cylinders and working equipment of the road, construction and hoisting-andtransport machines.Financial transparency: the author has no financial interest in the presented materials or methods. There is no conflict of interest.

scholarly journals Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

2019 ◽  
pp. 103-112 ◽  
Author(s):  
Grzegorz Filo ◽  
Edward Lisowski ◽  
Dominik Kwiatkowski ◽  
Janusz Rajda
Keyword(s):  
Geometric Model ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Hydraulic Actuator ◽  
Fluid Stream ◽  
Practical Applications ◽  
Supply Line ◽  
Throttle Valve ◽  
Cylinder Piston ◽  
Made In

This article discusses the possibility of increasing the speed of movement of a single-sided hydraulic cylinder piston rod using a fluid stream from the return line. Directing the return stream back to the supply line instead of the fluid reservoir causes significant increase in the inflow rate to the actuator. This situation may arise when the piston rod of the cylinder is not fully loaded on part of the movement range. As part of this work, we proposed a solution in the form of a novel control valve, consisting of a throttle valve and a differential valve controlled by the pressure difference between the supply line and the return line. A geometric model was created using SolidWorks, then a simulation model was made in Matlab/Simulink. Next, simulations were carried out to prove that the use of the return fluid stream gives a possibility of a significant increase in the piston rod speed. The results of the numerical analyses were verified on a test bench where the valve prototype was tested. Speed characteristics of the piston rod against both payload force and throttle valve setting were determined. High convergence with the simulation results was obtained. It has also been confirmed that the proposed solution can be advantageous in practical applications.

Digital Control Hydraulic Variable Pump Based on Mechatronic-Hydraulic-Air Integration Driven by Compressed Air

2011 ◽  
Vol 291-294 ◽  
pp. 2643-2646 ◽  
Author(s):  
Xiao Ming Sheng
Keyword(s):  
Digital Control ◽  
Simple Structure ◽  
High Reliability ◽  
Hydraulic Cylinder ◽  
Linear Displacement ◽  
Compressed Air ◽  
Displacement Sensor ◽  
Cylinder Piston ◽  
Forced Air ◽  
High Flexibility

This paper introduces digital control hydraulic variable pump based on mechatronic-hydraulic- air integration driven by compressed air. By inserting the toggle force amplifier in between double-acting rodless air cylinder and variable pump, this pump, driven by compressed air, utilizes small forced air to create big output power. The displacement of air cylinder piston is measured by using digitally linear displacement sensor and it is compared with input signal by computer in order to control pressure and flow rate output by hydraulic cylinder. This pump provides high flexibility and high reliability, simple structure and compact; it is easier to control by artificial intelligence and it will be widely used in the industry.

The Design of Hydraulic Cylinder for Measuring the Contact Stress of the Bud Type Seal Ring

2013 ◽  
Vol 834-836 ◽  
pp. 1365-1368
Author(s):  
Xi Zhang ◽  
Zhi Min Zhao ◽  
Miao Yu ◽  
Yan Yan Wang
Keyword(s):  
Contact Stress ◽  
Detection Method ◽  
Hydraulic Cylinder ◽  
Seal Ring ◽  
Test Cylinder ◽  
Cylinder Piston ◽  
Selection Of

At present, the bud type rings are widely used in the hydraulic cylinder piston rod seal, but there is no corresponding detection method to measure the contact stress when the seals are in the dynamic sealing condition. However, the contact stress is very important for analyzing the performance of the seals. A method for measuring the contact stress is presented in this paper, and the design of major parts of the test cylinder and the selection of seals are emphatically introduced.

Hydraulic Excavator Bucket Teeth Load-Time Courses Measurement

2014 ◽  
Vol 945-949 ◽  
pp. 2048-2052
Author(s):  
Xiao Li Hu ◽  
Wei Yan ◽  
Qin Xiang ◽  
Yu Ting Xie
Keyword(s):  
Low Cost ◽  
Measuring Method ◽  
Hydraulic Cylinder ◽  
Calculation Model ◽  
Hydraulic Excavator ◽  
Load Spectrum ◽  
Reliability Design ◽  
Hydraulic Excavators ◽  
Cylinder Piston ◽  
Time Courses

Based on the bucket teeth load-time courses calculation model under bucket digging condition, the stresses on the hydraulic cylinder piston rods of boom and bucket and the real-time length of bucket hydraulic cylinder were set as measured variables, and a measuring method of the bucket teeth load-time courses was developed which had the advantages of less measuring points, simplified measurement process and low cost. The bucket teeth load-time courses were calculated by inputting the measuring data into the self-developed Constructing Hydraulic Excavators Load Spectrum software, and its characteristics of each digging step in one excavation cycle at digging macadam were analyzed. Then, using rain-flow counting module in FE-SAFE software, the statistical graphs of bucket teeth load-time courses were acquired which could provide the basis for hydraulic excavator reliability design and fatigue life prediction.

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