CN202685972U - Unloading car brake system with eddy current retarder - Google Patents
Unloading car brake system with eddy current retarder Download PDFInfo
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- CN202685972U CN202685972U CN 201220391652 CN201220391652U CN202685972U CN 202685972 U CN202685972 U CN 202685972U CN 201220391652 CN201220391652 CN 201220391652 CN 201220391652 U CN201220391652 U CN 201220391652U CN 202685972 U CN202685972 U CN 202685972U
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- control system
- eddy current
- dummy car
- current retarder
- speed
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Abstract
The present utility model discloses a unloading car brake system with an eddy current retarder. The system comprises a motor, a shaft coupling, a speed reducer and a first control system, the motor is connected with the speed reducer through the shaft coupling, the system also comprises the eddy current retarder, a speed switch and a second control system, the eddy current retarder comprises a stator assembly and a rotor assembly, the eddy current retarder is connected between the motor and the shaft coupling, the speed switch is used for measuring speed of an unloading car body, the speed switch is connected with the second control system, the second control system is connected with the first control system and used for obtaining operation state of the unloading car body, and the second control system is connected with a stator coil of the stator assembly to control current of the stator coil according to speed parameters of the unloading car body. By adopting the system, safety, economical efficiency, environmental protection performance, stability and comfortableness of equipment can be enhanced.
Description
Technical field
The utility model relates to a kind of dummy car brake system for the defeated coal coal distributor of power industry, relates in particular to a kind of dummy car brake system with current vortex retarder.
Background technology
At present, at thermal powerplant, adopt dummy car to carry out coal blending.Dummy car can carry out by one of " full automaticity ", " S. A. " or " manually " three kinds of modes the coal blending of run coal bin.Respectively there is a limit switch at the two ends in each storehouse, are used for controlling moving forward and backward of dummy car, and dummy car is by driving before and after 2 electrical motors, and the employing frequency control.To the coal blending of each storehouse the time, dummy car will (for example, 0.0203m/s) move forward and backward continuously between two limit switches in current storehouse, evenly fill out the coal amount to reach maximum with low speed.Between each unit or filled it up with coal or maintenance coal bunker above motion or when turning back to raw bits, dummy car will move with maximum speed (0.203m/s).Dummy car is in normal coal blending process, the coal amount is greater than 800t/h automatically or during the S. A. coal blending, because large effect of inertia, along the coal flow path direction, dummy car can not realize reliably that rate conversion and low speed forward that forward arrive at a high speed low speed arrive reverse conversion, at this moment the maximum torque that provides of motor can't overcome load moment, exist stall to rush car, can not realize the automatic of dummy car and S. A. operation, only have the minimizing load, manually return, have a strong impact on the coal blending efficient of coal handling system.
At first analyze the reason that causes this phenomenon, under the normal condition, dolly is stressed to be had: mechanical friction f
Rub, belt has a pulling force f forward to dummy car after starting
Draw, coal compress belt after (belt and ground angle are 16 °) applied a thrust f to dolly in the horizontal direction
Push awayThe moment of torsion that * cos16 ° and electrical motor provide.In these power, f
Push awayThat variation with load changes, different and different with the distance of the size of load and horizontal displacement, if when coal amount moment reinforcement, and by chance be in reverse state or be in the fast interval of high speed step-down, rush car with regard to as easy as rolling off a log causing.In actual production, be difficult to keep the homogeneity of load coal supply, uncertain factor is more, therefore, rushes car in case dolly is in, and only has belt feeder is tightly stopped with dummy car, causes the heavy duty connection of whole coal handling system to stop, even the serious coal problem of spreading can occur.
Since dummy car adopts variable-frequency governor, whether can solve these problems by increasing the DC injection braking unit, facts have proved that when coal blending amount during less than 800t/h, the method can partly solve the car problem of rushing.Because only under reverse state, frequency dropped to 2HZ and drops into when brake unit dropped into, namely can play preferably effect oppositely the time, can effectively reduce and rush spacing, but distance is long, also be unallowed aborning, and it can't effectively overcome the car problem of rushing of high step-down.
Why 2 electrical motors and adopt variable frequency control even change high-performance frequency converter and still can't satisfy this requirement? be only to be lower than normal operation under the rated load, nominal load? this be because: this frequency converter adopts the control of permanent torque mode, be permanent magnetic flux, according to the induced potential equilibrium equation U of electrical motor
1≈ E
1=4.44f
1N
1Φ, when the additional power source voltage constant, the air-gap flux Ф of asynchronous motor is just substantially constant, i.e. and main flux is constant during frequency control, if main flux is too high, causes magnetic saturation and exciting current is increased, and power factor reduces; Main flux is too small, and then capacity motor can not take full advantage of.It is the constant constant control that this frequency converter adopts U/f, and dummy car normally operates under 50HZ and the 5HZ two states, and when frequency fell too low, the ability that electrical motor bears load reduced, and therefore is easy to cause oppositely the time rush car.
Braking for electrical motor, the method that can adopt is a lot, DC injection braking that provides such as: magnet stopper, electronic-hydraulic brake, external contracting drum brake, disc brake, resistance braking, reversing braking, regenerative braking, low-frequency brake and frequency converter etc.These braking methods lay particular emphasis on accurate shutdown and the location of electrical motor basically; except the DC injection braking of frequency converter can increase certain moment by on the go, there is no at present the actv. braking method and can apply according to the variation of load the control of suitable moment and participation process.
The utility model content
The purpose of this utility model is to provide a kind of dummy car brake system with eddy current retarder, the problem of rushing car, affecting coal handling system coal blending efficient to solve the stall that existing dummy car exists.
In order to address the above problem, the utility model provides a kind of dummy car brake system with eddy current retarder, it comprises electrical motor, coupler, reductor and the first control system, described electrical motor is connected in described reductor by described coupler, wherein, described dummy car brake system with eddy current retarder also comprises eddy current retarder, speed switch and the second control system, described eddy current retarder comprises stator assembly and armature, described eddy current retarder is connected between described electrical motor and the described coupler, described speed switch is installed on the dummy car body to measure the speed of dummy car body, and described speed switch is connected to transmit the speed signal of dummy car body to described the second control system with described the second control system, described the second control system is connected the running state that is used for obtaining the dummy car body with described the first control system, described the second control system be connected the stator coil of stator assembly and connect to control the electric current of described stator coil according to the speed parameter of dummy car body.
According to above-mentioned a kind of preferred implementation with dummy car brake system of eddy current retarder, wherein, described the first control system and described the second control system are the PLC control system.
According to above-mentioned a kind of preferred implementation with dummy car brake system of eddy current retarder, wherein, also be provided with the DC chopped-wave voltage-regulating module between the second control system and the described stator coil.。
After the utility model provided with electric eddy current retarder, can improve safety, economy, the feature of environmental protection, stability and the traveling comfort of equipment.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the physical construction scheme drawing of the utility model embodiment;
Fig. 2 is the electrical block diagram of the utility model embodiment.
The specific embodiment
Below in conjunction with accompanying drawing of the present utility model, the technical solution of the utility model is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As depicted in figs. 1 and 2, the utility model embodiment comprises electrical motor 1, eddy current retarder, coupler 31, reductor 32, speed switch 4, DC chopped-wave voltage-regulating module 7, the PLC control system 6 that has existed as the PLC control system 5 that increases newly compared with prior art of the second control system, as the prior art of the first control system, coupler 31 is connected in reductor 32, eddy current retarder comprises stator assembly 22 and armature 21, and eddy current retarder also comprises not shown bracket assembly certainly.Eddy current retarder is connected between electrical motor 1 and the coupler 21, speed switch 4 is installed on the dummy car body to measure the speed of dummy car body, speed switch 4 is connected to transmit the speed signal of dummy car body to this PLC control system 5 with PLC control system 5, the stator coil 8 that PLC control system 5 is connected with stator assembly connects to control the electric current of stator coil 8 according to the speed parameter of dummy car body, and PLC control system 5 is connected the running state that is used for obtaining dummy car with PLC control system 6.
In the present embodiment, also be provided with DC chopped-wave voltage-regulating module 7 between PLC control system 5 and the stator coil 8, to regulate the electric current in the stator coil 8.
With regard to principle, eddy current retarder is to lean on the application force of current vortex to slow down.When passing into galvanic the time to the stator coil 8 of eddy current retarder by some way, stator coil 8 can produce magnetic field, this magnetic field is at adjacent iron core, pole plate, air gap, form a loop between the rotor, if have relative motion between rotor and the stator this moment, this motion just is equivalent to conductor at cutting magnetic line, by electromagnetic induction principle as can be known, at this time conductor is inner can produce induced current, simultaneously induced electricity failing to be convened for lack of a quorum produces the another one Induced magnetic field, have application force between this magnetic field and the magnetic field that existed, and the direction of application force is to hinder the direction of conductor motion forever.Simultaneously, need to further specify the time because rotor conductor is very large, the induced current that produces at rotor is that the form with vortex flow exists.On the angle of energy conservation, when eddy current retarder plays brake action, be to be the kinetic transformation of equipment moving the electric energy of vortex flow and then to be consumed with the form of heat.
The eddy current retarder of present embodiment is comprised of mechanics and electric part two parts.Mechanics is comprised of bracket assembly, armature 21 and stator assembly 22 3 parts.Bracket assembly is fixed on the actuating device pedestal, and connecting stator assembly 22.Armature 21 is connected on coupler 31 or the reductor 32.Have between armature 21 and the stator assembly 22 very little gap (about 1～1.6mm), guaranteed retarder in the situation of operation, can carry out nothing and rub and freely rotate and brake.Electric part can comprise control assembly, battery isolator control, working station indicator, baroceptor and speed signal sensor.When using eddy current retarder, PLC control system 5 is connected stator coil 8, and stator coil 8 produces magnetic field, and the rotor cutting magnetic field of rotation produces whirlpool shape electric current, thereby forms magnetic line of force.At this moment, two magnetic field interactions produce a braking torque opposite with hand of rotation, make the transmission rotating speed slack-off, play the effect of deceleration.
At mechanics, the drive part of dummy car is comprised of electrical motor 1, coupler 31, reductor 32 etc., for eddy current retarder is installed, situation according to the scene, electrical motor 1 and coupler 31 taken apart eddy current retarder is installed between electrical motor 1 and the coupler 31, and prolong base seat support, the label alignment of disk before and after should be noted that in the installation, whether electrical motor 1, eddy current retarder, coupler 31 right alignmenies need the experimental check mechanical vibration qualified in allowed limits at last.Control housing and power cabinet are installed on the dummy car body, and be mobile with dolly.
At control part, consider that not the production system to prior art impacts, present embodiment increases a PLC control system 5 newly, the type selecting of taking into account simultaneously PLC is consistent as far as possible with the original system model, guarantee the facility in the maintenance, adopt the S7-300 Series Programmable, the control gross horsepower is mainly the about 1.2KW of eddy current retarder consumption of power, the about 0.3KW of other electrical equipment original paper, the cable in stock core of former sliding cable part is adopted in power supply.
Control part mainly be need to obtain the advancing of dolly from PLC control system 6, retreat, at a high speed, low speed signal, simultaneously at the dummy car body switch 4 that gathers way, after in a single day dolly occurred rushing the car phenomenon, speed switch 4 sent signal and according to circumstances will apply enough moment and prevent that dolly from " flying " car.In addition, because the work under bad environment of dummy car, about 40 ℃, dust is large always for ambient temperature, so must select good seal performance, guarantees that again the control apparatus element has the preferably control housing of radiating effect.For guaranteeing the conformability of production system, need the faulty condition of eddy current retarder is in time fed back to PLC control system 6 by PLC control system 5 simultaneously, feed back at last the ipc monitor picture of master control room.
During the operation present embodiment, the failure condition according to dummy car in service occurs, adopt respectively following logic control:
When dummy car is received master control instruction high speed step-down speed, increase gradually braking current, if detection speed reaches specified value simultaneously, then cancel braking current and finish braking, if hypervelocity, then enlarging moment stops.
When dummy car receives that master control room sends the instruction of parking, no matter be when high speed or low speed, all to adopt the mode that increases gradually moment to carry out.
When dummy car became setback by advancing, logic is judged to adopt increased the moment mode gradually, same as described above, judges whether at last correctly to finish the power cut-off process.
When selection applies moment big or small, go out total square according to the calculation of parameter of dummy car electrical motor, because f
Push awayPolytropy, can't obtain accurately load moment, can only judge by method and the experience of test, according to three kinds of situations of top logic control process, apply gradually from small to large respectively different moment, draw by test at last: increase moment numerical value during high speed step-down speed; When advancing, rear regression increases numerical value; When rushing car, need Experiment on Function to determine.Perhaps apply lock torque by Intelligence Feedback, so both reduced the inertia impulsive force of car load to mechanically operated damage, can reach again the purpose of flexible control.The lock torque formula N that also can provide according to eddy current retarder
System=Kt2 (test was adjusted when the size of K value was moved for the first time in system, and t is the time that lock torque reaches setting value) determines final increase moment values.
Because eddy current retarder is the no touch friction, adopt the mode that progressively increases lock torque so that braking is more steady, safety is better, reliable and stable, noise is little, long service life, maintenance are simple.Use eddy current retarder can increase braking force, brake response time is short, and stopping distance shortens.Eddy current retarder has good controller performance, just can accurately control lock torque by applying different electric currents, can provide level and smooth, electrodeless adjustable, with the irrelevant control torque of rotating speed.Compare with hydrodynamic retarder, under lower-speed state, can produce larger brake torque.Eddy current retarder has good heat dispersion and in-use performance, and ingenious rotor and the ventilation function with retarder of its hollow design and power ventilation system adapts, and carries out from the heat radiation operation.Equipment is reliable, and stability is high.
To sum up, the utility model provided with electric eddy current retarder can improve safety, economy, the feature of environmental protection, stability and the traveling comfort of equipment, and particularly, its preceence performance aspect safety, economy is as follows:
Safety aspect, (1) can carry equipment most brake loads in service, make the drg temperature rise reduce greatly to guarantee that drg is in good working state, and then alleviate or avoid braking ineffective, stall and rush the potential safety hazards such as car.(2) can provide powerful lock torque in a quite wide range of speed, retarder just can reach maximum lock torque.(3) be a relatively independent sensitive auxiliary braking system, its rotor and transmission shaft tighten together, and whenever can both provide lock torque by demand for control.(4) adopt electric current directly to drive, without intermediate link, its control response time is very short, and only 40 milliseconds, fast 20 times than hydrodynamic retarder response time.
Economy aspect, (1) be because not contact between the stator of current vortex retarder and the rotor do not have wearing and tearing, thereby fault rate is extremely low, at ordinary times except carrying out routine inspection, beyond keeping clean, other work seldom, so service expenditure is extremely low.(2) because current vortex retarder can be born the most lock torque of equipment, thus service life that can extension device, reduce service expenditure, increase economic efficiency.
The above; it only is the specific embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion by described protection domain with claim.
Claims (3)
1. dummy car brake system with eddy current retarder, comprise electrical motor, coupler, reductor and the first control system, described electrical motor is connected in described reductor by described coupler, it is characterized in that, described dummy car brake system with eddy current retarder also comprises eddy current retarder, speed switch and the second control system, described eddy current retarder comprises stator assembly and armature, described eddy current retarder is connected between described electrical motor and the described coupler, described speed switch is installed on the dummy car body to measure the speed of dummy car body, and described speed switch is connected to transmit the speed signal of dummy car body to described the second control system with described the second control system, described the second control system is connected the running state that is used for obtaining the dummy car body with described the first control system, described the second control system be connected the stator coil of stator assembly and connect to control the electric current of described stator coil according to the speed parameter of dummy car body.
2. the dummy car brake system with eddy current retarder according to claim 1 is characterized in that, described the first control system and described the second control system are the PLC control system.
3. the dummy car brake system with eddy current retarder according to claim 1 is characterized in that, also is provided with the DC chopped-wave voltage-regulating module between the second control system and the described stator coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391652 CN202685972U (en) | 2012-08-08 | 2012-08-08 | Unloading car brake system with eddy current retarder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391652 CN202685972U (en) | 2012-08-08 | 2012-08-08 | Unloading car brake system with eddy current retarder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202685972U true CN202685972U (en) | 2013-01-23 |
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ID=47541635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220391652 Expired - Fee Related CN202685972U (en) | 2012-08-08 | 2012-08-08 | Unloading car brake system with eddy current retarder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202685972U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967609A (en) * | 2014-05-05 | 2014-08-06 | 裘尧云 | Diesel engine capable of preventing galloping |
| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
| US9413217B2 (en) | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
| US9601918B2 (en) | 2012-06-28 | 2017-03-21 | General Electric Company | Systems and methods for controlling acceleration of a power generator |
-
2012
- 2012-08-08 CN CN 201220391652 patent/CN202685972U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
| US9413217B2 (en) | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
| US9601918B2 (en) | 2012-06-28 | 2017-03-21 | General Electric Company | Systems and methods for controlling acceleration of a power generator |
| CN103967609A (en) * | 2014-05-05 | 2014-08-06 | 裘尧云 | Diesel engine capable of preventing galloping |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140808 |
|
| EXPY | Termination of patent right or utility model |