scholarly journals Geometric, kinematic and dynamic parameters of the disc ripper

2021 ◽  
Vol 18 (5) ◽  
pp. 476-487
Author(s):  
V. A. Nikolayev
Keyword(s):  
Theoretical Analysis ◽  
Thrust Force ◽  
Labour Productivity ◽  
Soil Development ◽  
Energy Costs ◽  
Dynamic Parameters ◽  
Energy Device ◽  
Minimum Diameter ◽  
Continuous Action ◽  
Working Bodies

Introduction. The unit of continuous action for the formation of the underlying layer is designed to increase labour productivity in the construction of roads and other objects, for the construction of which it is necessary to remove the upper layer of soil. For loosening of soil in the unit used bit-like working bodies. Often, disc working bodies are used to cut the soil. Therefore, the expediency of using passive discs in road-building technical means, in particular, in the unit of continuous action for the formation of the underlying layer of highways, is of practical interest. Despite the large number of works, a detailed analysis of the operation of passive disks was not made. Therefore, in order to compare the energy costs for cutting the soil with passive discs and chisel-shaped working bodies, it is necessary to make a theoretical analysis of the operation of passive disks. Analysis of the energy costs of the disk ripper cannot be carried out without having the approximate values of its geometric, kinematic and dynamic parameters.The method of research. As part of a continuous unit to form the underlying layer of roads, each disc would be clamped with soil on both sides and carried out clamped cutting. Therefore, a disk ripper is adopted for analysis, aggregated with a separate energy device. On the basis of the constructive layout, rational geometric parameters of the disk ripper are revealed. The method of calculation of its kinematic and dynamic parameters is developed. In particular, the method of determining the weighted average circumferental velocity of the disk, the angular velocity of the disk and the circumferental velocity of the point on the edge of the disk blade is considered. The modes of cutting the soil by various parts of the disk are considered.Results. On the basis of the developed technique, the dependence of the minimum diameter of the disk on the depth of soil development was revealed. The moment of resistance of the soil to the rotation of the disks is calculated. The horizontal and vertical component of soil resistance to the front disc carrying out clamped cutting and subsequent discs carrying out semi-clamped cutting of the soil are determined. The necessary thrust force of the energy device for cutting the soil with a disk ripper and the dependence of the thrust force of the energy device for cutting the soil on the depth of soil development were revealed. The performance of the unit, including the power device and the disk ripper, is calculated.Conclusion. Since as part of the unit of continuous action for the formation of the underlying layer of roads, the disks will carry out clamped cutting of the soil, for preliminary loosening of the soil with disks, it is more expedient to use a separate unit, including an energy device and a disk ripper. On the basis of the theoretical studies carried out, the necessary thrust force of the energy device for cutting the soil and the total traction force necessary to move the disc ripper were revealed. The performance of the unit is calculated. To compare the energy costs for cutting the soil with passive discs and chisel-shaped working bodies, it is necessary to make a theoretical analysis of the energy costs for the operation of passive disks.

Energy expenditure on ground cutting by continuous action buckets to form the underlying layer of the road

2020 ◽  
Vol 17 (6) ◽  
pp. 676-689
Author(s):  
V. A. Nikolaev
Keyword(s):  
Total Energy ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
Cutting Process ◽  
Energy Costs ◽  
Continuous Action ◽  
Action Unit ◽  
Method Of Calculation ◽  
The Road ◽  
Working Bodies

Introduction. To solve the problem of accelerating the construction of roads, improving their quality, it is advisable to use a continuous action unit to form a underlying layer. In general, energy costs for the construction of roads are a significant share occupied by work aimed at cutting and transporting the ground. The working bodies of existing technical means carry out mainly energy-intensive cutting of the ground, which theoretically can be likened to cutting a punch. The energy costs of ground cutting can be significantly reduced by the use of blade cutting. In the bucket of the continuous action unit to form a underlying layer of roads provides the use of working bodies, cutting the ground with blades of knives. The process of filling the bucket with cut soil, the forces attached to the bucket, and the total amount of energy spent on cutting the ground with the buckets of the continuous action unit to form the underlying layer are considered. The method of research. The method of constructions to detect the kinematics of filling the bucket with the cut ground is given. The method of calculation is given: the path of the ground on the bottom of the bucket case when it is filled; the resulting force of force projections in the longitudinal-vertical, cross-vertical and horizontal plane attached to the bucket; moments attached to the bucket in a longitudinal-vertical and horizontal plane, when the bucket is empty and full. The formulas for calculating the total energy on the movement of the bucket when cutting the ground without taking into account the energy costs of the cutting process and determining the total energy costs of cutting the ground by one cubic meter of continuous action buckets to form the underlying layer of roads are given. Results. On the basis of the developed method, the conditional path of the ground along the bottom of the bucket case was calculated, the resulting forces of force projections in the longitudinal-vertical, cross-vertical and horizontal plane attached to the bucket were revealed. The moments attached to the bucket in the longitudinal-vertical and horizontal plane, when the bucket is empty and full, have been determined. The total energy for moving the bucket during ground cutting is calculated without taking into account the energy costs of the cutting process. The total energy costs of cutting the ground by one cubic meter of continuous action buckets to form the underlying layer of roads have been determined. Conclusion. During the filling of the bucket of the unit of continuous action to form the underlying layer of roads cut off soil is twisted and shift of the cut-off layer, which contribute to its destruction into fragments. In a cross-vertical plane, the bucket is balanced. The moment attached to the bucket in the longitudinal-vertical plane is balanced by elements of the structure of the unit. The total energy on moving the bucket when cutting the ground, without taking into account the energy costs of the cutting process, includes energy costs: to accelerate the ground with a bucket, to overcome the friction of the bottom plane of the bucket on the ground, to the additional horizontal force to move the bucket, caused by friction in the elements of the structure. It is u_k≈13 kJ/m3. Theoretically reasonable total energy costs for ground cutting of one cubic meter by the buckets of the continuous action unit to form the underlying layer of roads〖u 〗 (k-gr) ≈109 kJ/m.

scholarly journals Automated section for milling soil in near-trunk zones of orchard

2020 ◽  
Vol 161 ◽  
pp. 01068
Author(s):  
Dmitriy Khort ◽  
Rostislav Filippov ◽  
Igor Smirnov ◽  
Alexey Kutyrev ◽  
Stepan Semichev
Keyword(s):  
Theoretical Analysis ◽  
Quality Indicators ◽  
Hydraulic System ◽  
Tracking System ◽  
Fruit Trees ◽  
Original Design ◽  
Milling Cutter ◽  
Working Bodies

Machines used in gardens do not fully comply with the quality indicators of tillage, especially in the near-trunk zones of fruit trees. Theoretical analysis made it possible to establish that the preferred protective distance in the aisle of the garden should be at least 0.20 m in each direction, and in the inter-barrel space of the boles along a row of 0.38 m and to establish the optimal width of the extension section of 0.55 m. As a result of the research, an original design of the deflectable milling section of the garden milling cutter with an autonomous hydraulic system was proposed and developed, as working bodies knives with special sharpening are used. The tracking system of the remote section is equipped with a double remote probe, when exposed to which the section is retracted to the required distance to protect the trunk of a tree. The use of a deflectable milling section of a garden milling cutter allows to increase the accuracy and quality indicators of processing in the near-trunk zones of garden plantings, while the density of the soil decreases on average by 24%.

scholarly journals ANALYSIS OF METHODS FOR HARVESTING HAULM ROOT CROPS AND DESIGNS OF HARVEST MODULES

2020 ◽  
Vol 2 (38) ◽  
pp. 46
Author(s):  
E. Berezhenko
Keyword(s):  
Energy Saving ◽  
Row Spacing ◽  
Energy Costs ◽  
Root Crops ◽  
Technological Efficiency ◽  
Urgent Task ◽  
New Energy ◽  
Working Bodies

Improving the technological efficiency of the machines for harvesting root crops by reducing the energy costs of the process of harvesting the main array of hills is an urgent task. The solution to this problem is possible through the development of new energy-saving methods of assembly of the main array of hills and improved designs of hock-harvesting modules. The article provides an analysis of the methods of harvesting hogs and working bodies of harvesting modules. On the basis of the analysis, an energy-saving method of assembling the main array of the ridge and a scheme of an improved jerking module are proposed.Key words: rotary cutter, auger, guide channel, dividing disk, laying of a twig, row spacing of root crops.

scholarly journals STUDY OF STATIC AND DYNAMIC PARAMETERS OF HYDROCLEAVING DEVICE

2019 ◽  
Vol 2 (4) ◽  
pp. 89-97
Author(s):  
Aleksey Kordubaylo ◽  
Boris Simonov ◽  
Yuri Pronkin
Keyword(s):  
Oil And Gas ◽  
Static Pressure ◽  
Physical Simulation ◽  
Thrust Force ◽  
Dynamic Parameters ◽  
Study Results ◽  
Pressure Pulses ◽  
Maximal Pressure ◽  
Optimal Values ◽  
Working Liquid

In the work current importance of creation of hole electro driven pulse seismic sources for treatment of productive collectors of oil and gas deposit in order to hydrocarbons extraction intensification is justified. Study results of transfer center of strike pulses to extracting column are represented. The center is represented with hydrocleaving device. Objectives of the work are: establishing of dependences of plunger dies thrust force of hydrocleaving device on static pressure of working liquid in chamber, discovering of optimal values of hydrostatic pressure for provision of maximal pressure pulses in the chamber. Analytical dependence of thrust force on pressure in the chamber is obtained. Values of static strain of pipe fragment with diameter 122mm and wall thickness 9 mm under action of calculated thrust force are determined by methods of numerical simulations. Strains of fragment of the same pipe are experimentally studied under action of prototype thrust force. It is established that at pressure in the chamber up to 10MPa pipe strain at action axis is elastic up to 1mm. Repeatability of physical and numerical measurements is within 10%. With further increasing of the pressure up to 40 MPa the strain is elastic plastic up to 2.2mm. Using the method of physical simulation, it is established that pressure pulses in hydrocleaving device reach maximal values (up to 12 MPa) when values of preliminary static pressure are from 17 MPa up to 21MPa. However, increasing of strike energy above 180 J do not influence on value of pulse pressure significantly. Previously the devices of such type were not studied and were not applied in dynamic working modes. In the work recommendations for construction change of hydrocleaver for improvement of its dynamic parameters are formulated.

scholarly journals On the problem of interaction of the tillage working body with the soil

2020 ◽  
Vol 193 ◽  
pp. 01062
Author(s):  
Sergey V. Belousov ◽  
Evgeny E. Samurganov
Keyword(s):  
Theoretical Analysis ◽  
Soil Treatment ◽  
The Subject ◽  
The Moment ◽  
Working Bodies

The article is devoted to the main soil treatment with disk working bodies. The article has a research character, which is expressed in the fact that the theoretical analysis of the interaction with the soil, as well as excerpts from the works of leading scientists on the subject under study, which provide optimal soil treatment and their shortcomings and ways to solve these problems are indicated. Equations obtained allow us to determine the movement of a particle on the surface of the disk’s blade at the moment of its operation. The disk shape is theoretically justified. In conclusion, the main results achieved so far are presented.

scholarly journals Interaction analysis of bucket bottom knife with soil to build up subbase

2020 ◽  
Vol 17 (5) ◽  
pp. 598-610
Author(s):  
V. A. Nikolaev
Keyword(s):  
Total Energy ◽  
Soil Layer ◽  
Longitudinal Force ◽  
Energy Costs ◽  
Vertical Acceleration ◽  
Continuous Action ◽  
Action Unit ◽  
The Face ◽  
The Impact ◽  
Lower Plane

Introduction. To solve the problem of accelerating the construction of roads, improving their quality, it is advisable to use a continuous action unit to form a underlying layer. The main working elements of this unit are buckets, which cut off the soil layer from below and side. At the same time, the bottom knife cuts off the ground layer from below, the right knife - on the side, and the console knife partially cuts the top layer of soil from below for the next bucket. In particular, the analysis of interaction with the ground of the bottom knife of the continuous action unit is of theoretical and practical interest. To do this, the lower knife is divided into elements and the interaction of these elements with the soil is analyzed. The consistent impact on the soil of many bottom knives, within the width of the grip of the unit, is replaced by the impact on the ground of one conventional bottom knife at a distance necessary for the development of one cubic meter of soil. The forces of interaction of the conventional bottom knife with the soil are called conditional forces.The method of research. The method of calculating energy costs when introducing the bottom knife into the ground is presented. In general, when introducing the bottom knife in the ground, there are energy costs: to separate the soil, to overcome the friction of the ground on the edge of the blade, to overcome the pressure of the ground on the face, to the rise of the ground, to the vertical acceleration of the ground by the phase, to overcome the friction of the ground on the face, to overcome the friction of the ground on the surface, to overcome the friction of the ground on the lower plane. The total energy costs of interacting with a one cubic metre soil are derived from the addition of private energy costs. The method of calculating the horizontal longitudinal force needed to move the bottom knife is given.Results. On the basis of the developed method, energy costs are calculated in the introduction of the lower knife: on the separation of the soil, on overcoming the friction of the ground on the edge of the blade, on overcoming the pressure of the ground on the face, on the rise of the ground, on the vertical acceleration of the ground face, on overcoming the friction of the ground on the fascia, to overcome the friction of the ground on the lower plane. Energy costs to overcome the friction of the ground on the surface of the bottom knife are zero, as the soil flies over it. The total energy costs of the bottom knife interact with the soil of one cubic meter. The horizontal long-lived force needed to move the bottom knife has been determined.Conclusion. As a result of the calculations: the energy needed to cut the ground with the bottom knives, about 5 kJ/cube m., horizontal longitudinal force needed to move the lower knife - 16 N. To determine the total energy costs of moving the boiler unit to remove the top layer of soil from the underlying layer of the road, you need to analyze the interaction with the soil of other elements of the bucket.

scholarly journals Continuous action right knife unit with ground interaction analysis

2020 ◽  
Vol 17 (4) ◽  
pp. 452-463
Author(s):  
V. A. Nikolayev ◽  
D. I. Troshin
Keyword(s):  
Total Energy ◽  
Soil Layer ◽  
Practical Interest ◽  
Longitudinal Force ◽  
Energy Costs ◽  
Continuous Action ◽  
Action Unit ◽  
The Face ◽  
The Right ◽  
The Impact

Introduction. To solve the problem of accelerating the construction of roads, improving their quality, it is advisable to use a continuous action unit to form a underlying layer. The main working bodies of this unit are buckets, which cut off the soil layer from below and on the side. At the same time, the bottom knife cuts off the ground layer from below, the right knife on the side, and the console knife partially cuts the top layer of soil from below for the next bucket. In particular, the analysis of interaction with the soil of the right knife of the continuous action unit is of theoretical and practical interest. To do this, the right knife is divided into elements and analyzed the interaction of these elements with the ground. The consistent impact on the soil of many right knives, within the width of the grip of the unit, is replaced by the impact on the ground of one conventional right knife at a distance necessary for the development of one cubic meter of soil. The forces of interaction of the conventional right knife with the ground are called conditional forces.The method of research. The method for calculating the energy costs during punching the right knife into the ground is shown: on separating the formation of the ground from its body, on overcoming the ground friction on the edge of the blade, on overcoming the ground pressure on the edge of the blade, on accelerating the ground of the blade by means of the axle, on overcoming the ground friction on the shelf, to overcome the ground friction against the outside surface.The total energy costs of interacting with a soil of one cubic meter are derived from the addition of private energy costs. The method of calculating the horizontal longitudinal force needed to move the right knife is given.Results. On the basis of the methodology developed, energy costs are calculated when introducing the right knife into the ground: on separating the soil from its body, on overcoming the friction of the ground on the edge of the blade, on overcoming the pressure of the ground on the face of the blade, on the acceleration of the ground with a fascia blade, on overcoming the ground friction on the face. The total energy costs of the right knife interact with the soil of one cubic meter. The horizontal long-lived force needed to move the right knife has been determined.Conclusion. As a result of the calculations: the energy needed to cut the ground with the right knives, more than 71 J/cube. The horizontal longitudinal force needed to move the right knife is 730 N. To determine the total energy spent on cutting the ground by buckets of the unit to remove the top layer of soil from the underlying layer of the road, it is necessary to analyze the interaction with the soil of other elements of the bucket.

Operation efficiency of knitters knives of domestic and import production used in agricultural machines

2020 ◽  
pp. 149-154
Author(s):  
Valeriy I. Ivanov ◽  
Vyacheslav F. Aulov ◽  
Yuriy N. Rozhkov
Keyword(s):  
Labor Productivity ◽  
Feasibility Study ◽  
Economic Effect ◽  
Import Substitution ◽  
Research Purpose ◽  
The Internet ◽  
Energy Costs ◽  
Operation Efficiency ◽  
Working Bodies ◽  
Agricultural Machines

Utilization of various stalks of grain crops (wheat, soy and rapeseed) is made by their grinding, usually in the field. The crushed straw is scattered across the field, and the spreading width is adjusted depending on the width of the reaper cutting devices. (Research purpose) The research purpose is in analyzing the existing market of knives for agricultural machines; goods of enterprises producing the knives, harvesters, using knives, types of knives, part numbers, specifications of knives in size and durability and to produce a feasibility study of using hardening knives. (Materials and methods) Authors used a digital method of searching through the Internet for enterprises that produce knives; combines that use knives; types of knives and their characteristics. (Results and discussion) It was found that due to intensive wear, the geometry of the cutting part and the overall dimensions of the working bodies of harvesting machines change, which causes violations of agricultural requirements, increased losses during crop harvesting, and increased energy costs. It was found that the efficiency of an agricultural machine directly depends on the state of its working parts, since they are limiting in terms of durability. The article notes that replacement of worn elements is accompanied by more labor, which reduces labor productivity, unnecessary equipment downtime and ultimately reduce profits of the enterprise. These factors indicate the need for technological measures to increase the resource of working parts of cutting devices of agricultural machines. (Conclusions) The article presents the results of the analysis of the market of existing enterprises for the production of knives. It gaves a feasibility to study of the effectiveness of strengthening knives using the technology of the Federal scientific Agroengineering center VIM. Production of hardened knives gives a good economic effect on import substitution.

Theoretical Analysis of Link Length Errors in Large Guided Chain Systems

1993 ◽  
Author(s):  
Y. Jin ◽  
M. Carpino
Keyword(s):  
Theoretical Analysis ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Kinematic Analysis ◽  
Dynamic Parameters ◽  
Link Length ◽  
Chain System ◽  
High Speeds ◽  
A Chain ◽  
System Operating

Abstract Large guided chains are often used in manufacturing machinery to move materials and tooling. In such applications, the accuracy of the motion of the chain has a significant impact on the quality and yield of the process. The motion of the chain will be dependent on the geometry of the machine, the dynamic parameters of the machine, and the exact tolerances of the machine components. The research presented in this paper will first address the kinematics of a chain system. The analysis will include both chordal effects and link length variations, which affect the engagement between the chain and the drive sprocket. Second, the kinematic analysis will be used to develop a dynamic analysis based upon Lagrange’s equations for a chain system with variable link lengths. Results are presented which demonstrate the influence of chain mass and drive stiffness on the dynamic behavior of the system operating at both low and high speeds with oversized links.

Research on Electromagnetic Catapult-Oriented Permanent Magnet Linear Synchronous Motor

2012 ◽  
Vol 490-495 ◽  
pp. 509-513
Author(s):  
Ji Zhu Liu ◽  
Ming Chong Sun ◽  
Tao Chen ◽  
Ming Qiang Pan
Keyword(s):  
Finite Element ◽  
Theoretical Analysis ◽  
High Speed ◽  
High Efficiency ◽  
Thrust Force ◽  
Structural Parameters ◽  
Finite Element Analyses ◽  
Aircraft Carrier ◽  
Technical Requirements ◽  
Designing Method

Compared with steam catapult device, electromagnetic catapult device has high catapult energy, low system weight, high efficiency etc., so electromagnetic catapult makes an important developing direction for the aircraft carrier catapult. According to the technical requirements of electromagnetic catapult, the paper analyses the factors that affect the efficiency of electromagnetic catapult, proposes the method of using slotting PMLSM in low-speed segment and non-slotting PMLSM in high-speed segment to drive, which improves the systematic efficiency of the catapult process. The paper designs a structure of PMLSM assembled by stator modules. Also researches on PMLSM using the designing method of finite element, analyses the structural parameters the influences have on the thrust force of slotting and non-slotting motor, presents the optimal motor structural parameters, and at last proves the correctness of the theoretical analysis through experiment.

Sign in / Sign up

Export Citation Format

Share Document