CN105022886A - Space transhipment unloading elephant trunk design method based on discrete element method - Google Patents
Space transhipment unloading elephant trunk design method based on discrete element method Download PDFInfo
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Abstract
The invention is suitable for the technical field of unloading elephant trunks, and provides a space transhipment unloading elephant trunk design method based on a discrete element method, wherein a space transhipment unloading elephant trunk is composed of discrete elements of each segment. The design method comprises the following steps of: building a three-dimensional model of the discrete element of each segment through a three-dimensional software, and importing the three-dimensional model in a discrete element model software EDEM; creating a particle model of the material to be conveyed by the unloading elephant trunk, and importing the particle model of the material in the EDEM; determining simulation parameters, wherein the simulation parameters include operating speed and particle conveying quantity of a superior unloading device and a lower receiving device, and also include own material attributes of the particle and the discrete element, and contact attribute between the two; finishing simulation, and outputting simulation result. According to the invention, the discrete element method is introduced in the design process of the space transhipment unloading elephant trunk, movement locus of material flow in the elephant trunk can be fitted accurately, and variation of stress on each part of the elephant trunk can be calculated.
Description
Technical field
The invention belongs to discharger slip awaing tube technical field, particularly relate to a kind of space based on discrete element method and reprint discharger slip awaing tube method for designing.
Background technology
In the industrial circles such as metallurgy, coal, building materials, mining, chemical industry, all will carry every year, process large material, in course of conveying, the reprinting of material is absolutely necessary a link.Along with the increase year by year of material treatment capacity, the design problem of material reprinting aspect becomes increasingly conspicuous, and the research of this respect have also been obtained to be paid close attention to widely.
Transfer system is mainly made up of higher level's delivery device, elephant trunk and subordinate's feeding equipment three part.The major function of transfer system makes the material of higher level's delivery device be concentrated the middle body being discharged in subordinate's feeding equipment by elephant trunk, form stable stream shape, prevent belt feeder sideslip, prevent the material fallen from spilling and fall to the ground, in order to avoid waste resource, contaminated environment.
Elephant trunk plays a part directing material and flows in loading chute, in traditional elephant trunk design process, due to inconsiderate to various influence factor, easily cause and reprint elephant trunk fault such as feed blocking, elephant trunk spills material, elephant trunk serious wear, noise is large, dust is large, percentage of damage is high, the wearing and tearing of material feeding conveying belt, carrying roller well damage in the process of application, both have impact on the normal production of enterprise, turn increase unnecessary production cost.Therefore, be necessary to analyze the design of elephant trunk, and improved.
The method for designing of elephant trunk mainly contains physical model method and engineering experience method etc.First method needs the solid model building corresponding proportion, adopts the material of similar quality to carry out physical object simulating, and operating relatively intuitively, still process is loaded down with trivial details, and costly, the cycle is long, cannot use on a large scale.The experience that second method mainly relies on designer to accumulate in engineering reality in the past, designer is needed to have stronger overall qualities and design experiences, higher to the requirement of designer, design result often produces larger difference because of the difference of designer.Above two kinds of methods still can be dealt with for the elephant trunk design under general operating mode, but for the complex working condition that large conveying quantity, high drop, material characteristic comparatively complicated (such as water percentage is too high, abrasiveness is large, fragility is large, easily fragmentation etc.), elephant trunk shape are spatial special structure, said method cannot meet design requirement, and often causes feed blocking, elephant trunk spills material, elephant trunk serious wear, the fault such as noise is large, dust is large, percentage of damage is high, the wearing and tearing of material feeding conveying belt, carrying roller well damage.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of space based on discrete element method to reprint discharger slip awaing tube method for designing, to solve the problem of prior art.
The embodiment of the present invention realizes like this, discharger slip awaing tube method for designing is reprinted in a kind of space based on discrete element method, described space is reprinted discharger slip awaing tube and is made up of each section of discrete unit, described discrete unit comprises the transition section, free-falling section, convex arc section, concave arc-shaped section and the undertaking section that is connected with subordinate feeding equipment that are connected with higher level's delivery device, said method comprising the steps of:
Built the three-dimensional model of described each section of discrete unit by three-dimensional software, and described three-dimensional model is imported discrete element analysis software EDEM; Create described discharger slip awaing tube want the granular model of convey materials, and the granular model of described material is imported described EDEM; Determine simulation parameter, described simulation parameter comprises higher level's delivery device, the travelling speed of subordinate's feeding equipment and the grain amount of conveying; Described simulation parameter comprises particle and discrete unit own material attribute, and contact attribute between the two; Complete emulation, and Output simulation result.
Preferably, the granular model that the described discharger slip awaing tube of described establishment will be carried, specifically comprises: the style characteristic collecting material, and the granular model creating material according to each style characteristic.
Preferably, described simulation parameter also comprises: the size-grade distribution of material and the water percentage of material.
Preferably, described in complete emulation and specifically comprise: determine simulation step length, concrete: the severe degree of being moved by count particles chooses corresponding simulation time step-length, thus ensure the stability of particle system iterative computation.
Preferably, described in complete emulation, and Output simulation result, specifically comprise: the running status of emulation material in elephant trunk, show whether material the conclusion of putty, buildup can occur.
Preferably, the running status of emulation material in elephant trunk, specifically comprise: the behavior of emulation material aggregates inside, the intensity of colliding between each constituent in the system that analysis reprints discharger slip awaing tube by space, material forms, frequency and distribution, the speed of each material particles and position, and particles collision, wearing and tearing, to be polymerized and relevant energy of loosening, show whether material the conclusion of putty, buildup can occur.
Preferably, described in complete emulation, and Output simulation result, specifically comprise: emulation draws the normal force acted in the boundary surface of setting, tangential force and total acting force; With described normal force, tangential force and total acting force, determine the degree that on elephant trunk, each position is hit, and predict the serviceable life of elephant trunk.
Preferably, after described emulation draws the normal force acted in the boundary surface of setting, tangential force and total acting force, also comprise: analyze the normal direction between falling material and conveying belt and tangential total power, maximum, force and mean force, and calculate material whether sideslip can occur on material feeding belt conveyor.
Preferably, describedly complete emulation, and in Output simulation result, if simulation result is defective, wherein, the acting force that simulation result is less than predetermined threshold value the defective serviceable life comprising expection, subordinate's feeding equipment fallen by material, then described method also comprises: by adjusting the quantity of described each section of discrete unit and being connected angle, realize the dynamic conditioning of the normal force of material in boundary surface, tangential force and total acting force.
Preferably, described in complete emulation, and Output simulation result, also comprise: early warning is made for the work that calculates in simulation process position of may causing danger.
The beneficial effect that discharger slip awaing tube method for designing is reprinted in a kind of space based on discrete element method that the embodiment of the present invention provides comprises: discrete element method is incorporated into space and reprints in the design process of elephant trunk by the embodiment of the present invention, accurately can simulate the movement locus of stream in elephant trunk, calculate the stressed change of elephant trunk various piece; According to the contrast of material loading chute emulated data in elephant trunk, can analyze the stressed situation of change of each parts of elephant trunk, find out by the load such as material impact, vibration the best part, namely this part is the dangerous position that possible cause elephant trunk operational failure; Counter-measure can be made targetedly for dangerous position; According to material flow track, geometric configuration and the space arrangement form of elephant trunk can be improved; The stressed change of elephant trunk associated components before and after contrast improves, can verify improves one's methods is correct.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of a kind of reprinting of the space based on discrete element method discharger slip awaing tube method for designing that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the space reprinting discharger slip awaing tube that the embodiment of the present invention provides;
Fig. 3 is the structural representation of the space reprinting discharger slip awaing tube that the embodiment of the present invention provides.
The undertaking section that the transition section that 1---higher level's delivery device is connected, 2---free-falling section, 3---convex arc section, 4---concave arc-shaped section, 5---subordinate feeding equipment are connected.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
Discrete element method is incorporated in the design process of space discharger slip awaing tube.The thought of discrete element method comes from molecular dynamics the earliest, is applied to rock-soil mechanics the earliest.Through the development of several years, be obtained in a lot of field and apply widely, simulate and solve a series of engineering problem.The present invention utilizes discrete element method principle exactly, labor is carried out to the state of the material be transferred and air two-phase flow, elasticity between research material particles, stickiness, plasticity, deformation grade, slip, expansion and mobility, adopt Three Dimensional Dynamic Simulation analysis software (Engineering Discrete Element Method, EDEM) analytical technology, analyze the dropping process of material, design novel space and reprint discharger slip awaing tube.
EDEM software can be careful Simulation and analysis particle's behavior, and provide a platform for the combination of particle, fluid and Mechanics of Machinery.EDEM is the general CAE software coming the process of Simulation and analysis particle system and production operation with modernization discrete element analysis, its analog result can provide a lot of valuable data: it can analyze the behavior of the interactional aggregates inside with machine surface, the intensity of colliding between analytic system constituent, frequency and distribution, the speed of each particle and position and and an aggregates in particles collision, wearing and tearing, be polymerized and the structural intergrity of loosen relevant energy and submicron particle structure and riding chain.Utilize EDEM aftertreatment instrument, the system action of particle can be determined, thus amendment model is better to carry out simulating and to desired solution iteration.EDEM is particle system simulation software.It can set up parameterized model for Gas-Soliq Particle Systems, by importing computer-aided design (CAD) (the Computer Aided Des ign of true particle, CAD) model carrys out the shape of accurate description particle, by add mechanical property, material properties and other physical property set up granular model, and in simulation process generate data storing in corresponding database.
Adopt discrete element method design space to reprint the conventional method of discharger slip awaing tube to be: the contact model on the particle setting up material according to discrete unit ratio juris and particle, material particles and elephant trunk border and contact determination methods, utilize Hertzian contact theory to set up contact mechanics model simultaneously; According to actual condition, pass through computational analysis, set up the geometric model of elephant trunk, by the movement locus of EDEM software emulation material in loading chute, analyze material to the kinetic effect of the corresponding various piece of elephant trunk, pass through analysis result, improve design shape and the space arrangement form of elephant trunk, to reduce the shock and vibration of material to each parts of elephant trunk, increase the serviceable life of elephant trunk, reduce material broken simultaneously, reduce noise and reduce dust; In addition, elephant trunk is as the transitional rehandling facilities of a material, and its design quality directly affects the ability to work of material receiving device; Discrete element emulated data result in loading chute can be chosen calculating for material receiving device and provide valuable reference, for product beforehand research and can find before product uses whether product associated components exists serious quality problems, can a large amount of unpredictable loss be reduced, a large amount of time and financial resource and material resource expenditure can be saved; Industrial and mining enterprises be applied to further for expanding feeding equipment, playing great facilitation, there is wide application prospect.
Embodiment one
Be illustrated in figure 1 a kind of space based on discrete element method provided by the invention and reprint discharger slip awaing tube method for designing, described space is reprinted discharger slip awaing tube and is made up of each section of discrete unit, described discrete unit comprises the transition section, free-falling section, convex arc section, concave arc-shaped section and the undertaking section that is connected with subordinate feeding equipment that are connected with higher level's delivery device, said method comprising the steps of:
In step 201, built the three-dimensional model of described each section of discrete unit by three-dimensional software, and described three-dimensional model is imported discrete element analysis software EDEM.
As shown in Figures 2 and 3, the front elevation of the three-dimensional model of the elephant trunk built for utilizing three-dimensional software CAD and side view, marked each section of discrete unit involved by the embodiment of the present invention in figure.
In step 202., create described discharger slip awaing tube want the granular model of convey materials, and the granular model of described material is imported described EDEM.
In step 203, determine simulation parameter, described simulation parameter comprises higher level's delivery device, the travelling speed of subordinate's feeding equipment and the grain amount of conveying; Described simulation parameter comprises particle and discrete unit own material attribute, and contact attribute between the two.
In step 204, complete emulation, and Output simulation result.
Discrete element method is incorporated into space and reprints in the design process of elephant trunk by the embodiment of the present invention, accurately can simulate the movement locus of stream in elephant trunk, calculates the stressed change of elephant trunk various piece; According to the contrast of material loading chute emulated data in elephant trunk, can analyze the stressed situation of change of each parts of elephant trunk, find out by the load such as material impact, vibration the best part, namely this part is the dangerous position that possible cause elephant trunk operational failure; Counter-measure can be made targetedly for dangerous position; According to material flow track, geometric configuration and the space arrangement form of elephant trunk can be improved; The stressed change of elephant trunk associated components before and after contrast improves, can verify improves one's methods is correct.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, the granular model that the described discharger slip awaing tube of described establishment will be carried, specifically comprises:
Collect the style characteristic of material, and create the granular model of material according to each style characteristic.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described simulation parameter also comprises:
The size-grade distribution of material and the water percentage of material.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described in complete emulation and specifically comprise:
Determine simulation step length, concrete: the severe degree of being moved by count particles chooses corresponding simulation time step-length, thus ensure the stability of particle system iterative computation.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described in complete emulation, and Output simulation result, specifically comprise:
The running status of emulation material in elephant trunk, show whether material the conclusion of putty, buildup can occur.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, the running status of emulation material in elephant trunk, specifically comprises:
The behavior of emulation material aggregates inside, the intensity of colliding between each constituent in the system that analysis reprints discharger slip awaing tube by space, material forms, frequency and distribution, the speed of each material particles and position, and particles collision, wearing and tearing, to be polymerized and relevant energy of loosening, show whether material the conclusion of putty, buildup can occur.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described in complete emulation, and Output simulation result, specifically comprise:
Emulation draws the normal force acted in the boundary surface of setting, tangential force and total acting force;
With described normal force, tangential force and total acting force, determine the degree that on elephant trunk, each position is hit, and predict the serviceable life of elephant trunk.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described emulation also comprises after drawing the normal force acted in the boundary surface of setting, tangential force and total acting force:
Analyze the normal direction between falling material and conveying belt and tangential total power, maximum, force and mean force, and calculate material whether sideslip can occur on material feeding belt conveyor.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, describedly complete emulation, and in Output simulation result, if simulation result is defective, wherein, the acting force that simulation result is less than predetermined threshold value the defective serviceable life comprising expection, subordinate's feeding equipment fallen by material, then described method also comprises:
By adjusting the quantity of described each section of discrete unit and being connected angle, realize the dynamic conditioning of the normal force of material in boundary surface, tangential force and total acting force.
In conjunction with the embodiment of the present invention, there is a kind of preferred scheme, wherein, described in complete emulation, and Output simulation result, also comprise:
Early warning is made for the work that calculates in simulation process position of may causing danger.
Those of ordinary skill in the art it is also understood that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, comprises ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. discharger slip awaing tube method for designing is reprinted in the space based on discrete element method, it is characterized in that, described space is reprinted discharger slip awaing tube and is made up of each section of discrete unit, described discrete unit comprises the transition section, free-falling section, convex arc section, concave arc-shaped section and the undertaking section that is connected with subordinate feeding equipment that are connected with higher level's delivery device, and described method comprises:
Built the three-dimensional model of described each section of discrete unit by three-dimensional software, and described three-dimensional model is imported discrete element analysis software EDEM;
Create described discharger slip awaing tube want the granular model of convey materials, and the granular model of described material is imported described EDEM;
Determine simulation parameter, described simulation parameter comprises higher level's delivery device, the travelling speed of subordinate's feeding equipment and the grain amount of conveying; Described simulation parameter comprises particle and discrete unit own material attribute, and contact attribute between the two;
Complete emulation, and Output simulation result.
2. method according to claim 1, is characterized in that, the granular model that the described discharger slip awaing tube of described establishment will be carried, and specifically comprises:
Collect the style characteristic of material, and create the granular model of material according to each style characteristic.
3. method according to claim 1, is characterized in that, described simulation parameter also comprises:
The size-grade distribution of material and the water percentage of material.
4. method according to claim 1, is characterized in that, described in complete emulation and specifically comprise:
Determine simulation step length, concrete: the severe degree of being moved by count particles chooses corresponding simulation time step-length, thus ensure the stability of particle system iterative computation.
5. the method according to claim 1 or 4, is characterized in that, described in complete emulation, and Output simulation result, specifically comprise:
The running status of emulation material in elephant trunk, show whether material the conclusion of putty, buildup can occur.
6. method according to claim 5, is characterized in that, the running status of emulation material in elephant trunk, specifically comprises:
The behavior of emulation material aggregates inside, the intensity of colliding between each constituent in the system that analysis reprints discharger slip awaing tube by space, material forms, frequency and distribution, the speed of each material particles and position, and particles collision, wearing and tearing, to be polymerized and relevant energy of loosening, show whether material the conclusion of putty, buildup can occur.
7. the method according to claim 1 or 4, is characterized in that, described in complete emulation, and Output simulation result, specifically comprise:
Emulation draws the normal force acted in the boundary surface of setting, tangential force and total acting force;
With described normal force, tangential force and total acting force, determine the degree that on elephant trunk, each position is hit, and predict the serviceable life of elephant trunk.
8. method according to claim 7, is characterized in that, described emulation also comprises after drawing the normal force acted in the boundary surface of setting, tangential force and total acting force:
Analyze the normal direction between falling material and conveying belt and tangential total power, maximum, force and mean force, and calculate material whether sideslip can occur on material feeding belt conveyor.
9. method according to claim 1, it is characterized in that, describedly complete emulation, and in Output simulation result, if simulation result is defective, wherein, the acting force that simulation result is less than predetermined threshold value the defective serviceable life comprising expection, subordinate's feeding equipment fallen by material, then described method also comprises:
By adjusting the quantity of described each section of discrete unit and being connected angle, realize the dynamic conditioning of the normal force of material in boundary surface, tangential force and total acting force.
10. method according to claim 1, is characterized in that, described in complete emulation, and Output simulation result, also comprise:
Early warning is made for the work that calculates in simulation process position of may causing danger.
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| CN107239639A (en) * | 2017-06-29 | 2017-10-10 | 福建龙净环保股份有限公司 | The operation emulation mode and device of a kind of circular pipe belt type conveyer |
| CN108507357A (en) * | 2018-03-28 | 2018-09-07 | 中国冶集团有限公司 | Industrial furnace branch pipe tee connection liner brick setting out method |
| CN110496565A (en) * | 2019-08-15 | 2019-11-26 | 天地科技股份有限公司 | A kind of big flow twin shaft vibrates mixed coal conveying device and design method to roller |
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| CN105930568A (en) * | 2016-04-15 | 2016-09-07 | 河海大学 | Method for constructing particle cluster discrete element model of convex polyhedral aggregate in any shape |
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| CN106557613A (en) * | 2016-10-31 | 2017-04-05 | 中国五环工程有限公司 | A kind of rake teeth method for designing based on discrete element method |
| CN106557613B (en) * | 2016-10-31 | 2019-05-17 | 中国五环工程有限公司 | A kind of rake teeth design method based on discrete element method |
| CN107239639A (en) * | 2017-06-29 | 2017-10-10 | 福建龙净环保股份有限公司 | The operation emulation mode and device of a kind of circular pipe belt type conveyer |
| CN107239639B (en) * | 2017-06-29 | 2021-02-02 | 福建龙净环保智能输送工程有限公司 | Operation simulation method and device for circular tube belt conveyor |
| CN108507357A (en) * | 2018-03-28 | 2018-09-07 | 中国冶集团有限公司 | Industrial furnace branch pipe tee connection liner brick setting out method |
| CN108507357B (en) * | 2018-03-28 | 2020-01-31 | 中国一冶集团有限公司 | Laying-out method for bricks lined in three-way pipeline of industrial furnace |
| CN110496565A (en) * | 2019-08-15 | 2019-11-26 | 天地科技股份有限公司 | A kind of big flow twin shaft vibrates mixed coal conveying device and design method to roller |
| CN114239327A (en) * | 2020-09-09 | 2022-03-25 | 西安增材制造国家研究院有限公司 | Single-screw feeding optimization method and system based on discrete element method |
| CN114239327B (en) * | 2020-09-09 | 2024-06-25 | 西安增材制造国家研究院有限公司 | Single screw feeding optimization method and system based on discrete element method |
| CN113011033A (en) * | 2021-03-25 | 2021-06-22 | 赣江新区澳博颗粒科技研究院有限公司 | Numerical simulation method for belt type material conveying process of non-spherical particles |
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