scholarly journals Establishment of rational parameters of temperature of working liquid in the hydraulic drive of the excavator of the fourth dimensional group at different equipment

2021 ◽  
pp. 98
Author(s):  
Igor Pimonov ◽  
Igor Pohorilyi ◽  
Maksim Fedyuchkov
Keyword(s):  
Hydraulic System ◽  
Hydraulic Drive ◽  
Internal Flow ◽  
Technical Condition ◽  
Working Fluid ◽  
Fluid Temperature ◽  
Hydraulic Motor ◽  
Dimensional Group ◽  
Increasing Temperature ◽  
Working Liquid

The article considers the hydraulic drive of a modern excavator on which the influence of the working fluid temperature on the power is established, depending on the technical condition of the hydraulic elements. Studies have shown that new pumps and which have operating wear, have different rational temperature of the working fluid. It is impossible to imagine modern construction machines without equipping them with a hydraulic drive. The operation of the hydraulic drive largely determines the efficiency of operation of both a single machine and the entire fleet, which consists of new and old machines . The efficiency of hydrated machines is ensured in their design, manufacture, and operation, where an important role is played by the parameters of the working fluid: the degree of its contamination and temperature (viscosity). The influence of the temperature of the working fluid on the efficiency of the hydraulic drive and the ability to control the efficiency of the hydraulic drive with the help of temperature have not been studied enough. One of the promising areas in determining the rational temperature of the working fluid is the development of new designs of heat exchangers, heaters, diagnostic devices, which will be able to assess the technical condition of individual elements and the hydraulic drive as a whole. Establishing a rational temperature of the working fluid as a necessary parameter of the hydraulic system is mandatory when using modern methods to increase the efficiency of operation, maintenance and repair of hydraulic drives. With increasing temperature of the working fluid, its viscosity decreases and the loss of pressure and power in the mains of the hydraulic drive. However, this increases the internal flow of hydraulic units, which leads to an increase in power loss. Studies have shown that new pumps and which have operational wear, have different rational temperature of the working fluid. At rational values of temperature to the hydraulic motor the worn out pumps can give almost twice more power, than at 50 ° C, recommended for new pumps. The driving power of the pump, thus, practically does not change.

scholarly journals Justification of the Kinematic Diagrams for the Distribution System of a Planetary Hydraulic Motor

2018 ◽  
Vol 7 (4.3) ◽  
pp. 6 ◽  
Author(s):  
Angela Voloshina ◽  
Anatolii Panchenko ◽  
Oleg Boltynskiy ◽  
Igor Panchenko ◽  
Olena Titova
Keyword(s):  
Distribution System ◽  
Hydraulic System ◽  
Hydraulic Drive ◽  
Fluid Distribution ◽  
Working Fluid ◽  
Hydraulic Motor ◽  
Hydraulic Motors ◽  
Output Characteristics ◽  
Kinematic Diagram ◽  
The Impact

The output characteristics of a planetary (orbital) hydraulic motor could be significantly improved if the kinematic diagrams for its working fluid distribution system are chosen correctly and substantiated. Fluctuations in the flow of the power fluid cause pulsation in the cavity of the input pressure of the hydraulic motor. This results to vibration of the hydraulic system elements. Thus, the hydraulic motor can be considered as a source of pulsation which leads to functional failures of the hydraulic system. As they run at low rotational speeds with high torque, planetary hydraulic motors are commonly applied for a hydraulic drive in active working tools of self-propelled machinery. It has been established that one of the main components of a planetary hydraulic motor, which causes pressure pulsations, is its distribution system. The frequency and amplitude of these pulsations depends on the kinematic diagram for the distribution system of the power fluid. Therefore, we studied how the kinematic diagram for the distribution system effects on the output characteristics of a planetary motor. Since the change in the capacity of a distribution system with various kinematic diagrams influences on the output characteristics of a planetary motor, the impact was investigated. The kinematic diagrams, which improve the output characteristics of planetary hydraulic motors, were justified. 

The Ongoing Assessment of the Technical Condition of Avionic Hydraulic Drives on the Basis of Information Received from Means for Unbiased Flight Control of Aircrafts

2016 ◽  
Vol 817 ◽  
pp. 261-270 ◽  
Author(s):  
Leszek Ułanowicz
Keyword(s):  
Flight Control ◽  
Hydraulic System ◽  
Hydraulic Drive ◽  
Diagnostic Value ◽  
Technical Condition ◽  
Hydraulic Motor ◽  
Drive Control ◽  
Control Objective ◽  
Ongoing Assessment ◽  
First Time

During the ongoing operation of the hydraulic system you need a drive control information capable of maintaining fitness. Existing methods for assessing the technical condition of the hydraulic system require dismantling the hydraulic units and their research on test rigs. These methods are expensive, time consuming and do not provide a quick assessment of the technical condition. The aim of the study is to present the possibilities of using the evaluation of technical aviation hydraulic drive method which involves the use of objective information from the aircraft's flight control. In the proposed method, the carrier of information to the ongoing evaluation of the technical condition of the hydraulic system aviation as a whole is the pressure prevailing in it. With pressure and its features is inextricably bound up time. This relationship may be obtained directly from the objective flight control of the aircraft. The greatest credibility and the diagnostic value of two control parameters are obtained from the flight control objective. The first time the air pressure drop in the hydraulic drive from the top to the bottom of the measured value of the measured value after switching off the power unit. The second time the pressure falls below a certain value, and its return to the values ​​of the movement during the hydraulic motor. The method enables the ongoing assessment of the technical condition of the hydraulic system is a fast and costless.

Calculation of a closed hydraulic volumetric system

2021 ◽  
pp. 27-30
Author(s):  
Keyword(s):  
Power Plant ◽  
Wind Power ◽  
Hydraulic System ◽  
Working Fluid ◽  
Wind Power Plant ◽  
Hydraulic Systems ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Oil Pump ◽  
Selection Of

An algorithm is proposed for calculating a closed volumetric hydraulic pump-hydraulic motor system using the example of the hydraulic system of a wind power plant, based on the calculation of the hydraulic systems of mobile machines. The main characteristics of the system components, the selection of initial data for the calculation, working fluid and diameters of hydraulic lines are analyzed. Keywords: hydraulic system, energy, fluid, oil, pump, motor, renewable energy source, wind power plant, machine. [email protected]

scholarly journals ENERGY-EFFICIENT TECHNICAL SOLUTIONS FOR THE OPERATIONAL CHARACTERISTICS OF THE HYDRAULIC DRIVE OF THE TRACTOR

2021 ◽  
Author(s):  
R.V. Yudin ◽  
◽  
R.N. Puzakov ◽  
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Hydraulic System ◽  
Hydraulic Drive ◽  
Working Fluid ◽  
Uneven Terrain ◽  
Operational Characteristics ◽  
High Dynamic ◽  
Hydraulic Accumulator ◽  
Technical Solutions

During the movement of the tractor on the uneven terrain, there are fluctuations that cause jumps of the working fluid in the hydraulic system and high dynamic loads. The solution to this problem is the use of an energy-saving hydraulic drive with a hydraulic accumulator and a system of aggregates this leads to increased efficiency and increased productivity of skidding grippers. A mathematical model of working processes with an energy-saving hydraulic drive is compiled.

scholarly journals Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders

2019 ◽  
Vol 19 (3) ◽  
pp. 242-249 ◽  
Author(s):  
A. T. Rybak ◽  
I. K. Tsybriy ◽  
S. V. Nosachev ◽  
A. R. Zenin
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test Bench ◽  
Hydraulic Drive ◽  
Mechanical Transmission ◽  
Hydraulic Motor ◽  
Hydraulic Machines ◽  
Life Tests ◽  
Hydraulic Cylinders

Introduction. The durability and performance of hydraulic machines is determined through life tests. At that, various braking devices (mechanical, electric, hydraulic, etc.) are used for strength loading of the hydraulic motor, as a result of which a significant amount of energy is lost. This can be avoided if the method of rotational motion with energy recovery is used during life tests. This approach is applicable for hydraulic pumps, motors, and hydraulic cylinders.Materials and Methods. A test bench is presented, the design of which provides recreation of the conditions most appropriate for the field operation of hydraulic cylinders. In this case, energy recovery is possible. To solve the research problems, methods of mathematical modeling were used, the basic functional parameters of the proposed design were calculated. The determination of the pressure increment at various points in the hydraulic system is based on the theory of volumetric rigidity. When modeling the motion of the moving elements of the bench hydraulic system, the laws of rotor motion are used.Research Results. In the structure of the test bench, the cylinders in question are located in the pressure main between the hydraulic pump and the hydraulic motor. This enables to significantly reduce the bench itself and to save a significant amount of energy due to its recovery. A basic hydraulic diagram of the test bench for piston hydraulic cylinders is presented, in which the operation of the moving elements of the system is shown. A mathematical modeling of the hydraulic system of the bench is performed. A kinematic diagram of the mechanism for transmitting motion between test cylinders is shown.Discussion and Conclusions. The system of equations presented in the paper shows how the increment of pressure at the selected nodal points of the energy recovery system is determined (in particular, how the increment depends on time, reduced coefficient of volumetric rigidity, operating fluid consumption, and piston areas). The velocities of the hydraulic pistons are determined according to the kinematic scheme of the mechanical transmission of the bench. Thus it can be argued that, thanks to the solution presented in the paper, the life test results of hydraulic cylinders will adequately reflect their operation under rated duties.

scholarly journals MATHEMATICAL MODEL OF THE INTERACTION OF THE SCREW WORKING BODIES OF FOREST FIRE GROUND-THROWING MACHINES WITH THE GROUND COVER

2021 ◽  
Vol 11 (1) ◽  
pp. 163-171
Author(s):  
Petr Popikov ◽  
Anton Pozdnyakov
Keyword(s):  
Mathematical Model ◽  
Forest Fire ◽  
Forest Fires ◽  
Hydraulic Drive ◽  
Ground Cover ◽  
Forest Litter ◽  
Working Fluid ◽  
Hydraulic Motor ◽  
Working Bodies ◽  
Fire Ground

The paper provides an overview of research on the working processes of screw working bodies of technological machines. It is noted that at present such important issues in the theory of auger working bodies as the required number of auger turns, the required position of the auger spiral in relation to the center, etc. have not been fully resolved, since the solution of these issues can provide an increased productivity of the tool. A structural and technological scheme of a forest fire machine with multifunctional modules is proposed, which consists of auger working bodies, which can be changed modularly with a screw metal thread for a brush, depending on the area and type of soil, the rotor of the thrower, with the ability to drive the cutters-throwers and auger working bodies both from the power take-off shaft of the tractor, and using a hydraulic motor, a guide casing. A mathematical model of an auger working body with a hydraulic drive has been compiled for removing the ground cover with forest litter when extinguishing forest fires with a ground gun, so that combustible materials do not fall into the fire zone together with the soil flow from the rotor-thrower. The working process of the hydraulic drive of the auger working bodies of a forest fire ground-sweeping machine is described by a system of differential equations, including the equations of translational and rotational movements of the auger working body and the equation of the flow rate of the working fluid. The problem of optimization of kinematic and dynamic parameters of auger working bodies of forest fire ground-sweeping machine is set

The Transitional Simulation of Self-Propelled Winch System by the AMESim

2014 ◽  
Vol 687-691 ◽  
pp. 228-231
Author(s):  
Jing Tao Yue ◽  
Hui Pu ◽  
Xiao Jun Wei
Keyword(s):  
Hydraulic System ◽  
Structural Characteristics ◽  
System Simulation ◽  
Hydraulic Drive ◽  
Simulation Models ◽  
Operating Conditions ◽  
The Self ◽  
Hydraulic Motor ◽  
Control Loops ◽  
System Operating

The self-propelled winch system was studied taking the 20-ton transitional self-driven winch system as the engineering background. By the analysis of structural characteristics, control loops, speed solutions and hydraulic motor-driven forms of winch hydraulic system, The system of mathematical models was established which lay the foundation of the establishment of system simulation model. The walking hydraulic drive system simulation models were established by using AMESim software. On this basis, by setting different parameters, the simulation system operating conditions are simulated, which verified the rationality and stability of the design of the winch hydraulic transmission system.

scholarly journals IMPROVEMENT OF TECHNOLOGICAL EQUIPMENT OF THE MACHINE FOR TRIMMING TREE CROWNS IN ROADSIDE FOREST BELTS

2017 ◽  
Vol 7 (1) ◽  
pp. 205-210
Author(s):  
Попиков ◽  
Petr Popikov ◽  
Бухтояров ◽  
Leonid Bukhtoyarov
Keyword(s):  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Operating Conditions ◽  
Cutting Process ◽  
Design Parameters ◽  
Working Fluid ◽  
Hydraulic Motor ◽  
Technological Parameters ◽  
Tree Crowns ◽  
Circular Saw

When cleaning cutting, pruning of branches of roadside trees and shelter belt contour cutters are widely used, cutters is designed for total horizontal, vertical and oblique trimming crowns. These devices are hinged or removable ones and aggregated with wheeled tractors of traction class 0.6 to 1.4 kN, widespread in forestry. Improving the design of such devices is made in the following areas: cutting devices and hydraulic drives. In the proposed working body of the machine for cutting tree crowns containing base machine, crane on the handle of which a rotary hydraulic motor (rotator)is mounted, the shaft of which has movable connection with the housing of the circular saw with one-sided sharpening in the direction of the detachable part of the branch, V-shaped emphasis in the form of unilateral action hydraulic cylinder with spring-loaded rod, piston cavity which is connected in series with the drain lines of the hydraulic motor which is mounted an adjustable throttle to create pressure of the working fluid (support). In this implementation of the device when circular goes deep into the branch, which is cut, the V - shaped support with spring-loaded rod moves all the way in the branch and eliminates the clamping of the saw blade in the cut, which will improve reliability and performance. The article has developed a mathematical model of device for pruning tree crowns by circular saw with hydraulic drive on the basis of common methodology for the simulation of planar mechanisms. Differential equations of the cutting process were composed. The model of proposed design of the device for cutting tree crowns allows to study the influence of geometrical and mechanical parameters of the branches of the trees, technological parameters of cutting process on energy consumption and quality of the cut, taking into account design parameters. The model allows also to assess the performance and to examine the effectiveness of the device in different operating conditions.

scholarly journals INFLUENCE OF OPERATING MODES OF FOREST FIRE SOIL-THROWING MACHINE WITH HYDRAULIC DRIVE ON EFFICIENCY INDICATORS

2020 ◽  
Vol 10 (1) ◽  
pp. 209-217 ◽  
Author(s):  
P. Popikov ◽  
Petr Popikov ◽  
Andrey Sharov ◽  
Aleksandr Petkov ◽  
Anton Pozdnyakov
Keyword(s):  
Energy Saving ◽  
Forest Fire ◽  
Visual Analysis ◽  
Soil Layer ◽  
Hydraulic Drive ◽  
Fire Fighting ◽  
Working Fluid ◽  
Hydraulic Motor ◽  
Operating Modes ◽  
Efficiency Indicators

Many areas of human activity, in particular, agriculture and the timber industry, use technological machines and equipment having in their arsenal a hydraulic system for supplying pressure to the used units for soil cultivation, sowing, cutting, rooting out and many others. The article discusses the use of an energy-saving hydraulic drive. It provides experimental data on its use in a forest fire soil-throwing machine. The experiment was carried out using the LHT-55 forestry tractor, on the rear hitch of which a laboratory sample of a fire-fighting soil-throwing machine with a rotor-thrower drive from a hydraulic motor has been mounted. An adjustable hydraulic pump is installed on the rear frame of LHT-55 tractor, on which there is a regulator of the volume of supplied fluid. In the course of experimental studies we used the methods, specified in State Standard 20915–2011, Industrial Standard 70.2.16–73. During the experiments, the main indicators of the efficiency of forest fire-fighting soil-throwing machine have been determined: the maximum surge in the pressure of the working fluid in the hydraulic drive for the duty cycle Pm; the energy stored by the pneumohydraulic accumulator in one working cycle Pm (operation of the safety valve); the maximum energy that a pneumohydraulic accumulator with these parameters is able to accumulate per line kilometer or per shift Eav;, average range of the soil throwing Lav and the thickness of the soil layer depending on the distance of throw T. A large number of selected determining factors made it possible to depict graphically obtained data and conduct a visual analysis to obtain the most effective operating modes of a forest fire soil-throwing machine with an energy-saving hydraulic drive. The paper presents the rationale for the new design of a forest fire soil-throwing machine with an energy-saving hydraulic drive. The dependences of the efficiency indicators of working flows on the design and technological parameters of a forest fire soil-throwing machine have been obtained.

scholarly journals Assessment of the influence of the working fluid production on the output parameters of the transmission hydraulic motor of the front loader

2021 ◽  
Vol 1 (92) ◽  
pp. 167
Author(s):  
Viktor Kosolapov
Keyword(s):  
Bearing Capacity ◽  
Operating Time ◽  
Experimental Studies ◽  
Hydraulic Drive ◽  
Rate Of Change ◽  
Volumetric Efficiency ◽  
Working Fluid ◽  
Test Time ◽  
Hydraulic Motor ◽  
Fluid Production

Problem. During the operation of the volumetric hydraulic drive of the front loader, as the surfaces of the movable interfaces of the hydraulic drive elements wear out, the gaps increase, and as a result, the leaks of the working fluid (WF) increase, and, therefore, the performance of the machine as a whole decreases. The resource of the hydraulic drive units is largely determined by the physicochemical properties of the WF, and in particular, the ability of the WF to reduce the specific load in the contact of the surfaces of the movable joints. During the operation of the transmission hydraulic drive, the aging of the fluid occurs. As a result, its operational properties deteriorate, including a decrease in the bearing capacity of the WF  lubricant film. This leads to an increase in the wear of the interface surfaces of the volumetric hydraulic drive of the transmission (VHDT) and a decrease in the productivity of the machine. Goal. Experimental studies of the influence of the working fluid production on the rate of change of the volumetric efficiency of the hydraulic motor of the volumetric hydraulic drive of the front loader transmission have been carried out. Methodology.  The tests of the MP-90 hydraulic motor were carried out at the stand. The object of the study was the hydraulic motor of the MP-90 frontal loader. Hydraulic oil MANITOU HUILE HYDRAULIQUE ISO HV46 with different operating time was used as the WF. Samples were taken from the transmission drive system of the PMTS-1200 front loader. The experimental ones were carried out under the following conditions: WF temperature, t = 323 K; rotational speed of the pump drive shaft, n = 25 s ; the operating time of the WF varied within the range of T = 0–720 motor-hours with a step of 200 motor-hours; the purity of RZ is not less than 10 class according to GOST 17216-2001; the test time was taken equal to 40 hours; pressure in the discharge line 26.5 MPa, vibration amplitude 6 MPa, vibration frequency 0.2 s. Results. It is shown that an increase in the operating time of the WF during the operation of the machine determines, other things being equal, an increase in the rate of change in the volumetric efficiency of the VHDT hydraulic motor. Originality. To prevent increased wear of the moving surfaces of the VHDT interfaces during the operation of the front-end loader, it is necessary to use WF the bearing capacity of the lubricating film which is higher than the maximum permissible value. Practical value. The use of the results of the study will increase the VHDT of the hydraulic drive elements of the front loader and reduce the rate of decrease in its productivity during its operation.

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