CN103466284A - Belt conveyor centralized control method and system - Google Patents
Belt conveyor centralized control method and system Download PDFInfo
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- CN103466284A CN103466284A CN2013104210447A CN201310421044A CN103466284A CN 103466284 A CN103466284 A CN 103466284A CN 2013104210447 A CN2013104210447 A CN 2013104210447A CN 201310421044 A CN201310421044 A CN 201310421044A CN 103466284 A CN103466284 A CN 103466284A
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Abstract
A belt conveyor centralized control method comprises 1) measuring coal flow at a position S away from the machine head of a belt convey to obtained calculated coal flow amount; 2) according to the comparison result of the calculated coal flow amount and a threshold value to adjust the working frequency of a next belt conveyor. The invention also provides a belt conveyor centralized control system. The belt conveyor centralized control method and system enables every belt conveyor to perform automatic frequency variation reaction to coal flow to be increased or reduced in advance, avoids machine tail burying accidents caused by abrupt coal flow increase due to production imbalance, achieves real-time matching of the belt conveyors and the actual output of a mine and further achieves frequency variation in the true sense.
Description
Technical field
The present invention relates to the running technology of sealing-tape machine, more specifically, relate to centralized control method and the system of sealing-tape machine.
Background technology
In the mine district transport, extensively adopt conveyer, comprise belt conveyer (sealing-tape machine) and apron conveyer.Because driving surface is longer to the district coal bin distance, conveyer reaches 10 more than sometimes, is called the exploiting field transport systems.Each conveyer in whole transport systems, can control separately (manually divide on the spot platform control), but also centralized control (by a driver, controlling whole transport systems).
The artificial control that divides on the spot platform to control to be exactly every conveyer, by driver's local operation, is the most original a kind of mode.This mode is the master cock of direct control conveyer, operates the simplyst, does not increase any control components and parts, maintenance workload is less, but need personnel many, and often have contingency to occur because each driver's ideological quality and technical quality do not wait, impact is produced and is normally carried out.Except transportation range is very short or have specific (special) requirements, generally should not adopt this mode.But employing common control system.
Common control system, be to grow up in China the sixties in 20th century, is also a kind of mode that state-owned most of collieries generally adopt at present.It is newly-increased a set of centralized controlling device on whole lane of traffic, in large tunnel loading point centralized operation mechanism, by a driver, at loading point, handles whole conveyers.It not only can save a large amount of driver personnel, is also to find in time fault, shortens the off-time and has created condition with the comprehensive production automation.
In addition, along with the requirement of energy-saving and emission-reduction, the sealing-tape machine in working process is carried out to frequency conversion drive.When the coal mining flow is large, the sealing-tape machine working speed increases, flow hour, and working speed reduces.
When sealing-tape machine adopts frequency conversion drive, still adopt the centralized control form, centralized control center, ground maneuvers chamber carries out centralized control by optical cable to each frequency conversion sealing-tape machine of down-hole.Due to Mechanized and connect digging to advance driving surface etc. be not average rate production, on the different time sections sealing-tape machine, the coal flow is also different, thereby cause the load of sealing-tape machine also different, when the coal flow is very little, sealing-tape machine still keeps high-speed operation can cause the significant wastage of electric energy, and sealing-tape machine adopts the frequency conversion running will greatly save electric energy like this.Sealing-tape machine frequency conversion drive manner has two kinds:
(1) manually intervene conversion system.Due to sealing-tape machine, want when the type selecting emphasis to consider the needs of the following production capacity of mine, and when real-world operation, the actual production capacity of mine is more much smaller than sealing-tape machine, if sealing-tape machine is still in power frequency work, to occur " low load with strong power " phenomenon during mine normal production, sealing-tape machine is all the time in light condition.At this time can adopt manual mode, in advance the operation of sealing-tape machine is set in to a certain frequency, as be set to 80% of power frequency.Can greatly reduce like this sealing-tape machine operation power consumption, the unnecessary wearing and tearing of also avoiding the long-term high-speed operation of sealing-tape machine to cause simultaneously.
(2) automatic frequency-conversion mode.Due to sealing-tape machine underloading or when idle running electric current can reduce, control system is when sealing-tape machine moves like this, can determine according to the electric current (the also factor such as with good grounds conveyor belt tension) of sealing-tape machine variable-frequency motor the load of sealing-tape machine, then automatically adjust rotating speed (frequency quickening when load is large of sealing-tape machine according to magnitude of load, a load hour frequency reduces), to guarantee that sealing-tape machine adapts to the coal flowrate variation automatically, thereby realize energy-conservation purpose.
There is technical shortcoming in existing automatic frequency-conversion mode, and for manual intervention conversion system, although this mode is adopted in a large number in production, the shortcoming of this mode can not be ignored too.Because the prerequisite of manually intervening must be that between sealing-tape machine capacity and the actual production capacity of mine, irrational coupling is " low load with strong power ", the sealing-tape machine capacity just can adopt than the maximum production capacity of mine is much larger.In general, set the frequency of sealing-tape machine and must first calculate the actual maximum production capacity of mine, and then be multiplied by a safety factor with maximum production capacity and draw sealing-tape machine actual needs capacity, finally according to sealing-tape machine actual needs capacity, be converted into the sealing-tape machine operating frequency.Like this sealing-tape machine within the most of the time still in light condition, the electric energy of saving only for solving the problem of production capacity and the unreasonable coupling of capacity.Thereby, in real work, seldom adopt the manual intervention conversion system, and sealing-tape machine is all the time in the power frequency mode of operation, and frequency converter has only played the effect of soft start, can not realize sealing-tape machine frequency conversion running.
If adopt the automatic frequency-conversion mode of prior art, due to each getting working face of mine, when producing, each driving surface coal uninterrupted is unstable, and sealing-tape machine load can not truly reflect the coal flow on sealing-tape machine, and the phenomenon that coal stream buries tail occurs often.As fully-mechanized mining working becomes normal coal mining by feed suddenly, because the coal flow significantly increases suddenly, the coal significantly increased flows to while reaching adhesive tape tail place, because total coal amount on sealing-tape machine now is still less, it is still underloading that the sealing-tape machine load monitoring shows, sealing-tape machine still remains on lower operating speed, moment coal stream can cause the generation of pile things on adhesive tape tail accident.So realize that with sealing-tape machine load this function of automatic frequency-conversion does not have accomplished in production reality.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of sealing-tape machine centralized control method, comprising: 1) at the head length S place of distance sealing-tape machine, detect the coal flow, obtain calculating the coal flow; 2), according to the comparative result of described calculating coal flow and threshold value, regulate the frequency of operation of next sealing-tape machine.
The present invention also proposes a kind of sealing-tape machine centralized control system, for to multi-section sealing-tape machine dynamic frequency-conversion, comprising: a plurality of traction electric machines, a traction electric machine of each sealing-tape machine configuration; A plurality of frequency converters, each frequency converter is connected to a traction electric machine, for controlling the frequency of operation of traction electric machine; Control setup, frequency converter is connected to described control system by optical cable; Uclear scale, described uclear scale is arranged on the sealing-tape machine top, and apart from the head length S place of sealing-tape machine, described uclear scale is connected to described control setup by optical cable; Described control system is configured to: receive the coal flow that described uclear scale is measured, calculate and calculate the coal flow; According to described calculating coal flow and threshold, regulate the frequency of operation of next sealing-tape machine.
The invention has the advantages that:
1, with existing automatic frequency-conversion, compare, each sealing-tape machine can be made automatic frequency-conversion reaction in advance to the coal flow that is about to increase or reduce, and prevents due to unbalanced, the tail that the coal flow causes while increasing suddenly of producing by the accident of burying.
2, with manual frequency conversion, compare, manually frequency conversion is changeless, and its setting value is only eliminated " problem of low load with strong power ", but after setting, the actual capacity of sealing-tape machine still is complementary with the maximum production capacity of mine, can not solve the problem of unbalanced production.And this automatic frequency-conversion mode can accomplish that sealing-tape machine mates with the actual output of mine at any time, thereby realize frequency conversion truly.
The accompanying drawing explanation
The collection control schematic diagram that Fig. 1 is sealing-tape machine of the present invention;
The frequency conversion drive principle schematic that Fig. 2 is frequency converter;
The schematic diagram of the embodiment that Fig. 3 is sealing-tape machine centralized control method of the present invention;
The schematic diagram of the embodiment that Fig. 4 is sealing-tape machine centralized control method of the present invention.
The specific embodiment
As shown in 1, sealing-tape machine is driven by traction electric machine 5, the power determination of traction electric machine 5 operating speed of sealing-tape machine.Traction electric machine 5 is electrically connected to frequency converter 2, and frequency converter 2 is controlled the frequency of operation of traction electric machine 5.Frequency converter 2 can carry out variable frequency control at local control desk 1 by technical personnel, more advantageously, by ground control unit 4, is controlled.Frequency converter 2 is communicated by letter with ground control unit 4 by optical cable 3.
Fig. 2 has shown frequency converter 2 structures and the Frequency Conversion Theory in Fig. 1.Frequency converter 2 is to utilize the on-off action of power semiconductor device power frequency supply to be transformed to the electric energy control device of another frequency.By frequency converter, power frequency supply (50Hz or 60Hz) is transformed into to the source of AC of various frequencies, with the equipment of the variable-speed operation of realizing traction electric machine 5.Frequency converter 2 comprises:
Rectifier, rectifier will be transformed into direct current (DC) from the alternating current through the voltage transformer transformation of electrical network;
Inverter, it becomes alternating current by direct current (DC) another mistake;
Direct-flow intermediate circuit, smothing filtering is carried out in its output to rectifier, and direct-flow intermediate circuit can be sinusoidal filter.Because what inverter produced is square wave, the stack that square wave is sinusoidal waveform and high order harmonic, directly acting on electrical motor will damage motor and maybe should improve the motor voltage withstand class, and degree of utilization is low, so at the filter circuit that installs thereafter electric capacity, inductance additional and form, by the square wave harmonic elimination, be shaped as the near sinusoidal ripple.
Control circuit, it is controlled rectifier, inverter, direct-flow intermediate circuit, and control method is that application controls or Direct Torque battle array are controlled (DTC).
Fig. 2 only shows an example, and frequency converter 2 can also be vector-control frequency converter, and this frequency converter need to carry out a large amount of computings, and frequency converter can also comprise CPU and some the corresponding circuit that carries out torque calculation as required.
The output of frequency converter 2 is connected to the line frequency of the stator winding of electrical motor, thereby reaches the purpose of speed governing.Development along with industrial technology, frequency control not only can be optimized speed adjusting performance, and can realize saving energy and reduce the cost, therefore in application and the popularization of field, colliery converter technique, not only can improve significantly Coal Mine Electromechanical Equipment performance and degree of automation, and can realize energy efficiency, and reduce cost of ton coal, there is very large economic benefit and social benefit concerning coal mining enterprise.At present, the colliery converter technique is mainly used in longwall coal cutter, frequency conversion three machines, the equipment such as shuttle car, Lian Caiji, sealing-tape machine, force (forcing) pump.
Fig. 1 again, collection control sealing-tape machine converter plant comprises uclear scale 8, uclear scale 8 is arranged on tail 9 tops of last section strand with machine 7, and uclear scale 8 is for monitoring the coal flow on last section sealing-tape machine 7, and by optical cable 2, the coal flow signal is sent to centralized control center, sealing-tape machine ground device 4.
Known according to aforesaid prior art, the control frequency variation signal of sealing-tape machine automatic frequency-conversion running can not derive from sealing-tape machine load, should adopt other detection meanss.Because the mine main delivery system generally is the multi-section sealing-tape machine, can on each last section sealing-tape machine, install a uclear scale like this, to monitor the coal flow on each last section sealing-tape machine, and the coal flow signal is sent to centralized control center, sealing-tape machine ground.
End section sealing-tape machine refers to: while due to mine, installing sealing-tape machine, all that (at the bottom of going out slope mouth or main vertical, parking lot starts to lay each sealing-tape machine to driving surface from the main adit mouth, and extend forward with the field with "nine squares" developing, so the sealing-tape machine that goes out slope mouth in main adit is commonly referred to as the First sealing-tape machine, like this with the fully-mechanized mining working elevating conveyor or to connect what adopt that the face coal transporting breaking machine directly overlaps mutually be last section sealing-tape machine.In Fig. 2, only shown two sealing-tape machines, last section sealing-tape machine is with 7 and First sealing-tape machine 7-1.
First embodiment
As shown in Figure 3, method of the present invention comprises:
Step 1: the coal flow is detected at the head S length place at the distance sealing-tape machine;
S can determine according to the belt speed of belt feeder.On colliery, the belt speed V of last section sealing-tape machine 7 generally is about 4 meter per seconds, and rated load is 3000 tons/hour.Install belt conveyer scale (for example uclear scale) on end section sealing-tape machine 7 and measure the coal flow, the position of belt conveyer scale is S apart from the distance of head, preferably, and S=240 second.With a part of coal, flow at the time difference t=S/V=240/4=60 (second) through belt conveyer scale and adhesive tape head=1(minute like this), the coal flow signal is delivered to centralized control center, sealing-tape machine ground device 4 through optical fiber transmission.Certainly, according to practical application, belt conveyer scale can change apart from S apart from head.
On the one hand, last section sealing-tape machine 7 can adopt power frequency (50Hz) type of drive all the time, to prevent that the sealing-tape machine tail is by the generation of the accident of burying.
On the other hand, when needed also can frequency conversion drive end section sealing-tape machine 7.If during the sealing-tape machine power frequency running of last section, operational throughput is greater than the maximum production capacity of driving surface, last section sealing-tape machine operating frequency should be down to reasonable value.For example, during last section sealing-tape machine 6 power frequency, the actual fed ability is 2200 tons/hour, and its instantaneous maximum production of driving surface of bearing the conveying task is 1600 tons/hour, last section sealing-tape machine rotating speed can be descended to 20%, and last section sealing-tape machine 7 operating frequency can be 40Hz.Concrete down ratio can be set according to need of production.
In addition, although be noted that aforementioned coal flow is by recording such as instruments such as electronic scaless, described coal flow=instantaneous coal flow * sealing-tape machine speed.In other words when certain sealing-tape machine raises speed, the coal flow that its head unloading section flows out will increase in proportion with belt speed (supposing that the coal flow on this sealing-tape machine is uniform), so when control system predicts last section sealing-tape machine and comes the coal amount to increase by electronic scales, control system must increase all sealing-tape machines in the given time ratio in the coal amount is carried out the Synchronous Pre speed-raising, and the speed-raising speed that guarantees each top sealing-tape machine is not less than next sealing-tape machine, to prevent each adhesive tape machine tail place, presses coal or spill the generation of coal accident.
Principle of the present invention is exactly, and by detecting apart from the coal flow on the sealing-tape machine of head S distance, with threshold, controls the frequency of next step sealing-tape machine 7-1.That is to say, centralized control center's device 4 according to belt conveyer scale on last section sealing-tape machine 7 to the coal flow in this segment distance of head, thereby when the coal flow that increases or reduce suddenly is about to arrive last section adhesive tape head, (general advance time can be controlled in about 1 minute to send in advance instruction, to eliminate due to the error between sealing-tape machine running speed signal and actual speed and other errors), corresponding increase or reduce the electric machine frequency of the series connection sealing-tape machine 7-1 of next, to increase in advance or to reduce the capacity of next sealing-tape machine, guarantee that next adhesive tape function adapts to the needs of coal flowrate variation in time.
Step 2: according to measured coal flow and threshold, regulate the frequency of operation of next sealing-tape machine;
Centralized control center's device 4 is converted into main fortune sealing-tape machine operating frequency signal by the coal flow signal.Centralized control center's device 4 is collected on last section sealing-tape machine after the coal flow signal, according to the relation between sealing-tape machine operating frequency and coal flow, rated load while turning round according to sealing-tape machine power frequency (50hz), determine in proportion the sealing-tape machine operating frequency in variant coal flow situation, the coal flow value is converted into to main fortune sealing-tape machine operating frequency value.
For example, the rated load during running of sealing-tape machine power frequency is 3000 tons/hour, when 80% power frequency is 40hz corresponding coal flow be the 0.8*3000=2400 ton/hour, can calculate sealing-tape machine operating frequency value according to the coal flow value conversely thus, when condition meets, (belt speed raises or the decline condition), by the automatic input adhesive tape machine operating frequency of this operating frequency value controller chassis, can adjust the sealing-tape machine operating frequency immediately automatically.
In real process, be to guarantee the system normal operation, generally all leave surplus or different situation and condition of service is multiplied by corresponding coefficient according to sealing-tape machine, coefficient settings can be considered generally between 1.1-1.2, too low may causing spilt coal, and too high sealing-tape machine redundancy is too large, causes waste of energy.
More preferably, the present invention also comprises step 3: when coal flow rising changing value surpasses certain amplitude, and corresponding rise sealing-tape machine rotating speed;
This be because, consider that the coal flow is always among changing, frequently adjusting the sealing-tape machine rotating speed not have too large practical significance, should set the amplitude limit value, as when coal volume forecasting rising changing value over 10% the time, corresponding automatic rise sealing-tape machine rotating speed 10% immediately.And, except each last section sealing-tape machine, each main fortune sealing-tape machine of connecting will synchronously raise speed, and should be greater than a rear sealing-tape machine in accordance with last sealing-tape machine belt speed or capacity.
More preferably, the present invention also comprises step 4: when coal flow decline changing value surpasses certain amplitude and has continued certain time length, and corresponding downward sealing-tape machine rotating speed;
Raise difference with the sealing-tape machine belt speed and be, descend and only meet energy-conservation needs, postpone to descend and can not cause coal stream to block up, spill the phenomenon generations such as coal.Consider that driving surface interior production declining of very short time or stopping production (as occurred slightly having break in coalcutter coal cutting process) situation is more, should consider that in such cases the sealing-tape machine belt speed does not cut, in order to avoid situation about and then raising again occurs just having lowered.The factor that the sealing-tape machine belt speed is lowered like this focuses on only having the some work face to cause coal underfed, some work to look unfamiliar in production and produces the various underloading phenomenons that cause the sealing-tape machine long period such as extremely causing production declining, as adhesive tape machine-made egg-shaped or honey-comb coal briquets flow decline time length over 2 minutes, and fall is minimum surpasses 10%, and sealing-tape machine rotating speed automatically at this moment should descend.Under the sealing-tape machine belt speed, AM depth is same lowers with coal flow precedent, lowers the main fortune sealing-tape machine that requires respectively to connect and synchronously lowers, and should be greater than a rear sealing-tape machine in accordance with last sealing-tape machine belt speed or capacity.
Second embodiment
In second embodiment of the present invention, adopted diverse ways to control the frequency of sealing-tape machine.The method of this second embodiment comprises:
Step 1: Δ t measures the coal flow at distance sealing-tape machine head S place at set intervals.The method of measurement of this step is identical with the first embodiment, does not repeat them here.
The setting of coal flow signal reading interval of delta t and S, belt speed, coal flow are relevant.Δ t interval is less, more accurate to the measurement of the coal flow on sealing-tape machine, meticulousr to the control of sealing-tape machine.In general, belt speed is faster, and the coal flow is larger, and interval of delta t is less.
Step 2: the coal flow distributed in calculating from described S to the sealing-tape machine head, obtain coal flow sequence, select maxim Qmax;
Qmax is maxim that to be initial point from the sealing-tape machine head flow to distribution coal on this section zone face of the adhesive tape tail direction S of our department place cut-off.Suppose that coal flow signal reading interval is made as Δ t=10 second, uclear scale apart from the adhesive tape head apart from S=270 rice, the coal flow that a certain 10s recorded in the period be the Q=2000 ton/hour, end section sealing-tape machine operating speed is the V=4.5 meter per second, through the time of 10s, this coal stream advance is 10*4.5=45 rice, and in the time of such 10 seconds, 45 meters coal flows are 2000 tons/hour.Each coal flow during through uclear scale, can calculate its dynamic position on sealing-tape machine, can come from like this after uclear scale every the DYNAMIC DISTRIBUTION situation of 10 seconds each different coal flows of time gap on sealing-tape machine, as shown in Figure 4.
The first method of calculating that calculates the maximum coal flow Qmax in S length is:
While 1) starting, Qmax=0, the S place records coal flow Q1 first;
2) behind interval of delta t=10 second, the coal flow Q1 V* Δ t=4*10=40 rice<S (270 meters) that advanced, Qmax be 0 and Q1 in maxim, obvious Qmax=Q1, the coal flow sequence on sealing-tape machine is Q1 and the Q2 that just measured;
3) so repeat above-mentioned steps, until the 6th time gap, when the Q1 now recorded the earliest advances to head in 10 seconds through 6 (4*10*6=240 rice), on the sealing-tape machine now recorded, existing coal flow sequence has Q1, Q2 ... Q5(Qmax is the maximum in these 5 coal flows), and the Q6 just measured;
4) again through behind interval of delta t=10 second, measure Q7, Q1's 240+4*10=280 measured has first advanced > 270 meters, Q1 has flowed out the sealing-tape machine head, now on sealing-tape machine, existing sequence is Q2, Q3 ... Q6(Qmax is the maximum in these 5 coal flows), and the Q7 just measured.
According to length S, belt speed V, can determine in S length several coal flow sequential values are arranged in fact.But in practice, belt speed is what can change, the variation of belt speed can affect the value of coal flow, and while with part of coal is popular, entering on sealing-tape machine diverse location, the coal flow also changes with the variation of sealing-tape machine operating speed.The value that is to say coal flow sequence is dynamic change.The size of coal flow value is directly proportional to the sealing-tape machine operating speed.
As, it is 2000 tons/minute that uclear scale measures certain part of coal flow value on sealing-tape machine, now the sealing-tape machine operating speed is 4 meter per seconds, this part coal stream was advanced after a period of time on sealing-tape machine, because the sealing-tape machine operating speed slows down, be 2 meter per seconds, this part coal flow value become the 2000*2/4=1000 ton/minute.Therefore, the coal flow Qn that each has been measured, its distance=current distance of advancing+current belt speed * Δ t.What travel distance was greater than S shows to flow out sealing-tape machine, while when measure next time, calculating Qmax, no longer counts.
Step 3: the coal flow Q1 at measuring distance sealing-tape machine head S length place, described coal flow Q1 is compared with maxim Qmax, adjust the operating frequency of next step sealing-tape machine according to comparative result;
Coal flow Q1 according to distance last section's adhesive tape head S length place, adjust next sealing-tape machine motor rotation frequency automatically.As Q1>Qmax, press the size of Q1, automatically increase immediately the electric machine frequency of next sealing-tape machine, the frequency values of increase is directly proportional to the coal flow value.
In addition, because adhesive tape machine-made egg-shaped or honey-comb coal briquets flow is constantly all changing and during nuclon steelyard measure dynamic coal flow, numerical value jumps larger, frequently adjusts next sealing-tape machine frequency meaning little, therefore just carry out frequency modulation by exceeding certain amplitude when above as plussage reaches 10%, to eliminate variable, jump and affect.In actual production, the reading jump amplitude of electronic scales is still larger, observes its coal rheologyization not obvious, can consider to adopt the method for average to eliminate the impact that the coal flow value jumps, and as every 10s is one section, gets the variation foundation of its average as the coal flow.
For as coal flow on sealing-tape machine, reducing to gradually certain amplitude, as the Q1 fall surpasses 10%, and Q1<Qmax, automatically by Q1 value down ratio, reduce next sealing-tape machine operating speed.
The 3rd embodiment
In the 3rd embodiment of the present invention, adopted diverse ways to control the frequency of sealing-tape machine.The method of the 3rd embodiment comprises:
Step 1: measure the coal flow at distance sealing-tape machine head S place.
Advantageously, can adopt belt feeder to measure, the coal flow that monitoring is passed through continuously in real time.
Step 2: the coal flow distributed in calculating from described S to the sealing-tape machine head obtains the coal flow value on this zone face;
The belt feeder collection be certain flashy coal flow value, therefore, by instant value is carried out to integration in time, can obtain the coal flow value on the zone face of this length S.
Step 3: by described coal flow value and threshold, regulate the frequency of operation of next sealing-tape machine;
Usually, the frequency values of next step sealing-tape machine to described coal flow value, be directly proportional by, because adhesive tape machine-made egg-shaped or honey-comb coal briquets flow is constantly all changing and during nuclon steelyard measure dynamic coal flow, numerical value jumps larger, frequently adjusts next sealing-tape machine frequency meaning little.Therefore can by exceed certain amplitude as plussage reaches 10% can frequency modulation when above, jump and affect to eliminate variable.Concrete grammar is identical with the second embodiment.
So, for next step sealing-tape machine, by predict future a period of time (as predicted in 5 minutes, carrying out the coal situation of change), the tail of this sealing-tape machine coal flowrate variation on the horizon situation, regulate in advance its operating frequency, thereby realize the reasonable collection control of multi-section sealing-tape machine.
In addition, last section sealing-tape machine preferably is chosen as the crossheading sealing-tape machine near driving surface, and all crossheading sealing-tape machines that so last section sealing-tape machine is later and all great lane sealing-tape machine can be realized the frequency conversion running.
It should be noted that, because being drives the frequency converter of sealing-tape machine frequency conversion itself to want the loss electric energy, the sealing-tape machine frequency conversion drive should be set threshold value, as the coal flow can be taked frequency conversion drive at 90% of sealing-tape machine rated value when following, larger inclined gallery or the inclined shaft for angle, the threshold value of sealing-tape machine frequency conversion drive should be lower, as 80%, can take frequency conversion drive when following.
The 4th embodiment
In the present embodiment, describe the optimization technique method, above-mentioned centralized control method is improved.
Described threshold value can be by load (current value or active volt-amperes) or the operating frequency of next step sealing-tape machine in the foregoing embodiments, and sets.The coal the flow on the horizon if carrying capacity of next step sealing-tape machine can be loaded, without the operating frequency that increases next step sealing-tape machine.But to consider whether to reduce the problem of frequency.That is to say, described threshold value changes, and can be corrected.
1, according to each sealing-tape machine, this sealing-tape machine operating frequency is revised in current load
When main fortune sealing-tape machine is long, for example have 8 sealing-tape machines, the sealing-tape machine zone face has 12Km altogether, likely there will be calculation error.Therefore, load that can be current according to each sealing-tape machine, current value or active volt-amperes, revise this sealing-tape machine operating frequency.
As certain gallery sealing-tape machine (gallery sealing-tape machine energy-saving effect is more obvious), when power frequency turns round, it is rated value with carrying capacity 50%, when operating frequency is 25Hz, known sealing-tape machine will become fully laden, now sealing-tape machine acting reduces, and the current value of motor or meritorious value will drop to an anticipated value (this depend primarily on sealing-tape machine zone face itself the reduction that produces due to speed decline of the increment load that produces).If the current value of frequency conversion rear motor or meritorious value are greater than the first anticipated value, can judge that sealing-tape machine zone face coal flows through full, the risk that exists coal to overflow zone face, should raise the frequency conversion value.Correspondingly, if after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value are lower than the second anticipated value, lower the frequency conversion value of this sealing-tape machine, wherein the first anticipated value is greater than the second anticipated value.
2, install in the sealing-tape machine appropriate location accuracy that belt conveyer scale carrys out corrected Calculation additional.
Measure the coal flow as the sealing-tape machine that overall length is 12km at its 6km place, obtain measured value, by the comparison of measured value and computing value before, and get higher value.Existing for a long time both to differ larger phenomenon should analyze its reason and be corrected.
The sealing-tape machine of multi_motor control, as coal flow all too hour, little when the certain value, can automatically cut off a part of motor, to reduce non-power consumption loss.
In addition, advantageously, in the time of need to raising speed to the multi-section sealing-tape machine, for the speed-raising amount of last sealing-tape machine, be greater than a rear sealing-tape machine simultaneously, and, for the speed-raising time of last sealing-tape machine will be a little early than a rear sealing-tape machine, to prevent the coal piling phenomenon.
The 5th embodiment
Automatic frequency-conversion also can adopt the method for segmentation frequency conversion to realize, as main fortune sealing-tape machine is born a fully-mechanized mining working altogether, and the coal amount of two driving faces.When fully mechanized coal face stops producing, driving face also, when producing, because the coal flow will become very little, can be lowered each main fortune sealing-tape machine running speed degree according to the shutdown signal of fully mechanized coal face crossheading sealing-tape machine automatically, as under motor, is adjusted to 20Hz.
The 6th embodiment
Also can automatically along coal stream, start and stop each sealing-tape machine.Due to coal rheologyization on each sealing-tape machine look-ahead, when each driving surface starts to produce, each sealing-tape machine can be restarted when coal stream is about to arrive its head like this, as startup in 1 minute in advance, when drawing sky, coal stream automatically stops immediately sealing-tape machine running, the generation of the phenomenon of stopping to dally.
For predictive control time point more accurately; time point and the operating speed that now can come the adjacent strips machine of coal direction to start or stop according to each sealing-tape machine be estimated the time point that our department's adhesive tape machine-made egg-shaped or honey-comb coal briquets stream will arrive or draw empty time point, thereby realizing accurately automatically starting or shutting down.
In sum, the present invention reads different period coal flow values on the last section sealing-tape machine of multi-section series connection sealing-tape machine automatically by measurement instruments such as uclear scales, and according to each sealing-tape machine operating speed, length equivalence, calculate the travel distance of each period coal flow on sealing-tape machine, thereby draw coal flow dynamics distribution situation on each sealing-tape machine.
The present invention is according to coal flow dynamics distribution situation on each sealing-tape machine, anticipation is about to enter the coal flowrate variation trend of each sealing-tape machine, and according to being about to the coal flow that increases or reduce, appropriateness is sent the variable frequency control instruction in advance, increase in advance or reduce the operating speed of each sealing-tape machine, guarantee that each sealing-tape machine capacity can mate the coal flow of variation in time, reach not only guarantee to produce but also save electric energy, texts reduces wear.
According to above-mentioned centralized control method.Refer again to Fig. 1, sealing-tape machine centralized control system of the present invention and core are to install additional mutual between belt conveyer scale and control setup 4 and frequency converter 2, traction electric machine 5 on sealing-tape machine.Uclear scale, the head length S place apart from sealing-tape machine, be connected to described control setup 4 by the coal flow of measurement by optical cable.Control setup 4 receives the coal flow that described uclear scale is measured, and calculates and calculates the coal flow; According to described calculating coal flow and threshold, regulate the frequency of operation of next sealing-tape machine.Control setup 4 is sent to frequency converter 2 after calculating the frequency of operation value after adjustment, and frequency converter 2 drives traction electric machine 5 to change frequency of operation.Concrete regulative mode is as described as above-mentioned parametric technique embodiment.
Concise and to the point, in one embodiment, control setup 4 calculates, and described calculating coal flow rises or decline changing value while surpassing described threshold value certain amplitude, by the corresponding rise of described frequency converter 2 or lower the frequency of operation of next sealing-tape machine.
In another embodiment, described uclear scale calculates the coal flow at distance sealing-tape machine head length S place every a spacer segment time Δ t.The coal flow that described control setup distributes in calculating from described S to the sealing-tape machine head, obtain coal flow sequence, selects coal flow maxim Qmax as described calculating coal flow; The coal flow Q1 at measuring distance sealing-tape machine head S length place, as described threshold value.Wherein said coal flow maxim Qmax obtains according to the belt speed dynamic calculation of sealing-tape machine, and described interval time Δ t is by sealing-tape machine belt speed, length S, coal flow and determine.
In another embodiment, described control setup is after the coal flow is detected at the head length S place of distance sealing-tape machine, and the coal flow distributed in calculating from described S to the sealing-tape machine head, obtain the coal flow value on this zone face, as described calculating coal flow.
In another embodiment, described control setup according to each sealing-tape machine current load revise this sealing-tape machine operating frequency, and correction is sent to frequency converter, frequency converter is controlled the frequency of operation of this sealing-tape machine by traction electric machine according to this correction.
In another embodiment, after described control setup calculates: if after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value are higher than the first anticipated value, raise the frequency of operation of this sealing-tape machine; If, and after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value, lower than the second anticipated value, are lowered the frequency of operation of this sealing-tape machine, wherein the first anticipated value is greater than the second anticipated value.
In another embodiment, a plurality of belt conveyer scales can be set, each belt conveyer scale is arranged on the midway location of current sealing-tape machine, and each belt conveyer scale is connected to described control system by optical fiber.Described control setup obtains actual measurement coal flow, by measured value and described measurement coal throughput ratio, adjusts the frequency of operation of current sealing-tape machine according to both higher values, and the value after adjustment is sent to corresponding frequency converter.
Above-described embodiment is typical embodiment of the present invention; but the present invention is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (18)
1. a sealing-tape machine centralized control method, is characterized in that, comprising:
1) detect the coal flow at the head length S place of distance sealing-tape machine, obtain calculating the coal flow;
2), according to the comparative result of described calculating coal flow and threshold value, regulate the frequency of operation of next sealing-tape machine.
2. sealing-tape machine centralized control method according to claim 1, is characterized in that, described step 2) also comprise: when described calculating coal flow rises or decline changing value while surpassing described threshold value certain amplitude, corresponding rise or lower the rotating speed of next sealing-tape machine.
3. sealing-tape machine centralized control method according to claim 1, is characterized in that, described step 2) also comprise: set the head length S apart from sealing-tape machine according to sealing-tape machine frequency of operation and lifting capacity.
4. sealing-tape machine centralized control method according to claim 1, is characterized in that,
Described step 1) comprises:
1-1) every a spacer segment time Δ t, at the head length S place of distance sealing-tape machine, calculate the coal flow;
The coal flow distributed in 1-2) calculating from the head length S of distance sealing-tape machine to the sealing-tape machine head, obtain coal flow sequence, selects coal flow maxim Qmax as described calculating coal flow;
1-3) the coal flow Q1 at the head S length place of measuring distance sealing-tape machine, as described threshold value.
5. sealing-tape machine centralized control method according to claim 4, it is characterized in that, described coal flow maxim Qmax obtains according to the belt speed dynamic calculation of sealing-tape machine, and described interval time Δ t is by sealing-tape machine belt speed, head length S apart from sealing-tape machine, coal flow and determine.
6. sealing-tape machine centralized control method according to claim 5, it is characterized in that, described step 1) also comprises: after the coal flow is detected at the head length S place of distance sealing-tape machine, the coal flow that calculating distributes in from the head length S of distance sealing-tape machine to the sealing-tape machine head, obtain the coal flow value on this zone face, as described calculating coal flow.
7. sealing-tape machine centralized control method according to claim 1, is characterized in that, also comprises: step 3) according to each sealing-tape machine current load revise this sealing-tape machine operating frequency.
8. sealing-tape machine centralized control method according to claim 7, is characterized in that, in step 3), if after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value are higher than the first anticipated value, raises the frequency of operation of this sealing-tape machine; If, and after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value, lower than the second anticipated value, are lowered the frequency of operation of this sealing-tape machine, wherein the first anticipated value is greater than the second anticipated value.
9. sealing-tape machine centralized control method according to claim 1, it is characterized in that, also comprise: 3 ') install belt conveyer scale additional at the midway location of current sealing-tape machine, obtain actual measurement coal flow, by measured value and described measurement coal throughput ratio, adjust the frequency of operation of current sealing-tape machine according to both higher values.
10. a sealing-tape machine centralized control system, for to multi-section sealing-tape machine dynamic frequency-conversion, is characterized in that, comprising:
A plurality of traction electric machines, a traction electric machine of each sealing-tape machine configuration;
A plurality of frequency converters, each frequency converter is connected to a traction electric machine, for controlling the frequency of operation of traction electric machine;
Control setup, frequency converter is connected to described control system by optical cable;
Uclear scale, described uclear scale is arranged on the sealing-tape machine top, and apart from the head length S place of sealing-tape machine, described uclear scale is connected to described control setup by optical cable;
Described control system is configured to: receive the coal flow that described uclear scale is measured, calculate and calculate the coal flow; According to described calculating coal flow and threshold, regulate the frequency of operation of next sealing-tape machine.
11. sealing-tape machine centralized control system according to claim 10, it is characterized in that, described control setup is configured to: when described calculating coal flow rises or decline changing value while surpassing described threshold value certain amplitude, by the corresponding rise of described frequency converter or lower the frequency of operation of next sealing-tape machine.
12. sealing-tape machine centralized control system according to claim 10, is characterized in that, sets according to last section sealing-tape machine rotating speed and lifting capacity apart from the head length S of sealing-tape machine.
13. sealing-tape machine centralized control system according to claim 10, is characterized in that,
Described uclear scale calculates the coal flow every a spacer segment time Δ t at the head length S place of distance sealing-tape machine;
Described control setup is configured to: calculate head length S from described apart from sealing-tape machine to the coal flow distributed in the sealing-tape machine head, obtain coal flow sequence, select coal flow maxim Qmax as described calculating coal flow; The coal flow Q1 at the head S length place of measuring distance sealing-tape machine, as described threshold value.
14. sealing-tape machine centralized control system according to claim 13, it is characterized in that, described coal flow maxim Qmax obtains according to the belt speed dynamic calculation of sealing-tape machine, and described interval time Δ t is by sealing-tape machine belt speed, head length S apart from sealing-tape machine, coal flow and determine.
15. sealing-tape machine centralized control system according to claim 14, it is characterized in that, described control setup is configured to: after the coal flow is detected at the head length S place of distance sealing-tape machine, the coal flow that calculating distributes in from described S to the sealing-tape machine head, obtain the coal flow value on this zone face, as described calculating coal flow.
16. sealing-tape machine centralized control system according to claim 10, it is characterized in that, described control setup is configured to: according to each sealing-tape machine, this sealing-tape machine operating frequency is revised in current load, and correction is sent to frequency converter, frequency converter is controlled the frequency of operation of this sealing-tape machine by traction electric machine according to this correction.
17. sealing-tape machine centralized control system according to claim 16, is characterized in that, described control setup is configured to: if after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value are higher than the first anticipated value, raise the frequency of operation of this sealing-tape machine; If, and after frequency conversion, the current value of the motor of sealing-tape machine or meritorious value, lower than the second anticipated value, are lowered the frequency of operation of this sealing-tape machine, wherein the first anticipated value is greater than the second anticipated value.
18. sealing-tape machine centralized control system according to claim 10, is characterized in that, also comprises: a plurality of belt conveyer scales, each belt conveyer scale is arranged on the midway location of current sealing-tape machine, and each belt conveyer scale is connected to described control system by optical fiber;
Described control setup is configured to: obtain actual measurement coal flow, by measured value and described measurement coal throughput ratio, adjust the frequency of operation of current sealing-tape machine according to both higher values, the value after adjustment is sent to corresponding frequency converter.
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