CN101493676A - Control method and control device for bucket wheel material fetching machine with material measure and calculate - Google Patents
Control method and control device for bucket wheel material fetching machine with material measure and calculate Download PDFInfo
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Abstract
The invention provides a method for controlling a bucket-wheel reclaiming machine with material measurement and calculation, comprising the steps as follows: a current detection module (2) detects corresponding weak alternating current voltage signal from the line current of a bucket-wheel motor current circuit (1); the weak alternating current voltage signal is transmitted to a current/voltage signal conversion module (3) so that the rectification, voltage-stabilization and amplification treatment of the signal is carried out; the voltage signal which is processed by rectification, voltage-stabilization and amplification is input to a reclaiming automatic control module (6) which controls the actions of a revolving mechanism (19) and a truck feeding mechanism (20) according to the change of the voltage signal; and the actions of the revolving mechanism (19) and the truck feeding mechanism (20) cause the bucket-wheel motor current circuit (1) to change. The invention also relates to a reclaiming automatic control device. As the reclaiming automatic control method of the invention is adopted and the reclaiming automatic control device of the invention is installed, the functions of automatic control of reclaiming, flux display and alarming when the flux exceeds the arranged value can be quickly and simply realized at low cost.
Description
Technical field
The present invention relates to be used for the control device and the control method of bucket wheel reclaimer, especially relate to the control device and the control method that are used for the cantilever type bucket-wheel reclaimer, this cantalever bucket machine band material measuring and calculating.
Background technology
Bucket-wheel stacker reclaimer is mainly used in storing up, take and homocline of bulk cargo, and it is bringing into play important function as the core of the continuous handling system of bulk cargo.It both can be got material at bedding plant by the bucket wheel of rotation and transport, and material can be arrived the stock ground through bucket jib belt conveyor inverted running with bank again, and the heap that belongs to continuous high-efficient is got the handling machinery of unification.Stacker-reclaimer is widely used in the bedding plant of departments such as the coal yard of large-scale bulk goods harbour, fuel-burning power plant, large-scale earth work building site, the ore coal feedstock field of iron and steel corporation, large-scale coke-oven plant, large-scale cement factory, light industry chemical industry, takes materials such as stacking coal, ore, sandstone, coke, salt.
Development through decades, the bucket-wheel stacker reclaimer development level of China has obtained bigger raising, but compares with developed country, still has obvious gap, its control technology only limits to based on the unit control of Programmable Logic Controller (PLC) for core, and level of operation also only limits to the unit manual mode.From initial research steering development, product quality and the design level of Xiang Genggao stride forward now domestic bucket-wheel stacker reclaimer.Control technology with current industrial circle advanced person, compunication and treatment technology, fault diagnosis technologies etc. are incorporated in the control and communication system of bucket-wheel stacker reclaimer, it is the direction of China's bucket-wheel stacker reclaimer control and development communication technologies, it also is the inevitable approach that improves the economic target of bucket-wheel stacker reclaimer operation, some producers and colleges and universities develop jointly and start to walk now, application to bucket-wheel stacker reclaimer industrial control system and field bus technique, the exploitation of bucket-wheel stacker reclaimer management system configuration software, straighforward operation motion planning control algolithm, image monitoring and treatment technology, the sensor configuration technology, Remote Network Monitoring and service etc., can make China realize great-leap-forward development, integrate with advanced international standard as early as possible in the technical merit in this field.
The structure of bucket-wheel stacker reclaimer and profile be referring to accompanying drawing 1, mainly is made up of travel mechanism 33 (roller type), slew gear 35, bucket wheel mechanism 31, bucket jib and bucket jib belt conveyor 32 (not only material feeding, but also discharging), luffing mechanism 37 (luffing device), counterweight 38, cab 39, electric equipment etc.
Bucket-wheel stacker reclaimer is Three Degree Of Freedom (straight line moving, get on the bus a rotation and pitching) engineering machinery, actual material extracting operation adopt usually rotation continuously, intermittently walking and manually the pitching mode realize layering, etc. measure material.
The cantilever type bucket-wheel stacker-reclaimer is normally got material based on the layering of revolution when getting material, see accompanying drawing 2 and accompanying drawing 3.Generally to get the superiors' material earlier, get material according to the method for successively getting material from top to bottom, the material process is got in its layering: the bucket wheel machine of bucket-wheel stacker reclaimer is set up in the stockpile top layer as starting point, getting top ground floor → several walking drilling depths and several revolution gets material → bucket-wheel stacker reclaimer and retreats, before the jib nutation carry out the second layer → several walking drilling depths and several revolution and get material → cart and shunt, adjust three layers → several walking drilling depths of pitching to the and several revolution and get material ... → the bottom → several walking drilling depths and several revolution one way one cart are shunt, adjust pitching and return ground floor, so reach the purpose of getting material continuously repeatedly.
Also can be along with the variation of the number of plies position of getting stockpile and changes in the angle of revolution of equipment, scope maximum in angle of revolution during the bottom, and rotating angular range minimum during the superiors, every layer of drilling depth number of times of different parameters equipment is different with the drilling depth amount.
For the bucket-wheel stacker reclaimer that the automatic control system function has been installed, for adapting to the requirement of full-automatic operation, bring into play the function of automatic control system effectively, can set up bucket-wheel stacker reclaimer automatic material taking motion planning.
Adopt to wait and to measure the material mode, can improve the work capacity and the functional reliability of bucket-wheel stacker reclaimer, the impact shock in the time of can reducing bucket-wheel stacker reclaimer and get material improves its serviceable life.After bucket-wheel stacker reclaimer piled regular stockpile, if the complete standardization of stockpile, then material extracting operation can open loop approach be controlled.
Inhomogeneous logistics meeting produces bucket wheel, belt conveyor and jib to be impacted, and should make logistics stable as far as possible in getting the material process.But owing to get the restriction of material technology, when bucket wheel was made revolution break-in and variable phase angle and changed on the cantilever border, streams can reduce inevitably, even reaches zero, thus at the uniform velocity rotation to get material fully continuously be impossible realize, and middle part acquisition that can only be in stockpile.
Bucket-wheel stacker reclaimers etc. are measured material control algolithm PLC program circuit and are seen accompanying drawing 4.
The width of stockpile is wide unfavorable to the normal operation of equipment.Too short as used reclaimer jib-length with respect to the stock ground width, the bucket-wheel stacker reclaimer of both sides, stock ground only can be got the middle part in this stock ground, after a side of stockpile is removed, because stockpile has certain height, the stockpile landslide can often take place actual getting when expecting in equipment, and bucket-wheel stacker reclaimer structure, slew gear, the cantilever belt conveyor of equipment are transshipped.To start the large vehicle walking device after transshipping and withdraw from, influence mechanical efficiency.Long-term overload can influence the serviceable life of equipment.The width of stockpile is preferably when equipment is got material can get the stockpile material of a side farthest.Iff the middle part of the perpendicular end surface that can get stockpile, then when concrete the use, must note when landslide occurring, reducing as much as possible the overload of equipment.
Three phases has been experienced in the control system development of bucket-wheel stacker reclaimer basically, also i.e. manually control on the spot, semiautomatic control and control automatically.
Phase one-unit is manually controlled the stage
20th century six, the bucket-wheel stacker reclaimer control system of the seventies was made up of discrete relay, contactor and multicore traditional cable etc., the position detection control switch of mechanism also is in the initial stage of development, what adopted only is the mechanical switch with simple functions, and its accuracy of detection and degree of protection etc. are extremely low.Operating personnel carry out on-the-spot independent operation to single device in the bucket-wheel stacker reclaimer pilothouse. can not realize the interlock requirement of system complex.
Manually get and expect to get materials flow amount instability, can take place aborning to make driving arrangement and subsequent delivery flow process overload above rated flow, shorten service life of equipment, cause that tripping operation also can influence production run owing to getting material owing to judge by range estimation and experience fully; Do not reach rated flow plant factor is reduced and get material.
Existing bucket-wheel stacker reclaimer and stock ground width are because the restriction of actual conditions is difficult to accomplish reasonable disposition, cart drilling depth amount excessive during manual operation can make the bucket wheel drive motor transship, for example the 2# of BaoGang steel Co., Ltd's (calling Baosteel in the following text), 3# cantilever bucket-wheel stacker reclaimer and width this just situation in stock ground between them have quite a few enterprise also to exist such situation.Baosteel adopts belt scale to the measurement of mass flow and accumulative total tonnage, is used for monitoring and gets the materials flow amount, prevents to surpass rated flow.But be installed in belt scale on the reclaimer arm belt conveyor owing to reasons such as reclaimer vibration is big, cantilever luffing angle frequent variations all can cause error in dipping.Be installed on the belt feeder owing to electronic scales in addition, flow shows to have hysteresis quality, the stressing conditions that can not in time reflect bucket wheel scraper pan can't in time detect stockpile and cave in that the flow that causes is uprushed and bucket wheel drive motor overload, can not be as getting the material sensor of control automatically.The price of belt scale is higher in addition, and installation cost is bigger.
On the reclaimer that electronic measuring scale is not installed, can only get the material state and prevent the generation of transshipping, weak effect by range estimation.
As seen, it is more manually to control shortcoming, but this control system structure and technology are simpler, and at present, the fuel-burning power plant of China is all adopted manual control mode on the spot basically.
Subordinate phase-semiautomatic control stage:
When switching different stockpiles and floor height and carry out material extracting operation, reclaimer moves to the work of initial position and is manually finished by the operative employee, and after setting relevant parameter, material extracting operation is controlled automatically by reclaimer.
Accompanying drawing 4 shows the PLC program circuit that a kind of existing cantilevered reclaimer PLC gets material semiautomatic control algorithm, therefrom as can be seen, material extracting operation is to control with open loop approach, promptly before getting material, set cantilever angle of revolution value and cart feed value, when carrying out automatic material taking, move according to setting process, not influenced by the external procedure environmental change, its prerequisite is " after bucket-wheel stacker reclaimer piles regular stockpile, supposing the complete standardization of stockpile " (is strip, edge neatly, highly consistent).
The shortcoming that existing P LC gets the material semi-automatic controller is:
(a) most of cantilever type bucket-wheel reclaimer is when actual production moves, and stockpile is not complete standardization.At first, in order to improve the utilization ratio of reclaimer and bedding plant, the reclaimer track both sides material of several different cultivars of can banking up forms to overlook and is oval-shaped less stockpile rather than strip.Secondly, frequent windrow is got and is expected that the switching operation also can cause stockpile irregular.Reclaimer cantilever angle of revolution can change along with the difference of reclaimer position when such situation can make material extracting operation, and accompanying drawing 3 is got the material schematic top plan view for existing cantilever type bucket-wheel reclaimer.Rotary path W1, rotary path W2 and rotary path W3 be owing to reclaimer position (P1, P2, P3) different present different arc length, that is to say when getting material that the angle of revolution needs to adjust at any time could realize that grade measures material.Existing semi-automatic controller need repeatedly suspend material extracting operation, resets the angle of revolution, material has been got guaranteeing, and production efficiency is low, and practicality is not high.
(b) in PLC programmed control flow process, the setting value of cart feeding distance has only one, can cause the difference of flow in actual production along with the gyratory directions difference.
(c) angle of revolution control and cart feeding control all need the feedback signal of external encode sensor and the processing of Programmable Logic Controller, and it is more to relate to equipment, the equipment complexity, and the corresponding raising of spoilage is invested bigger.
The phase III-control the stage automatically
In order to adapt to the requirement of large power plant, the equal altitudes automated production of modernized harbour, increase work efficiency the necessary robotization of the course of work of bucket-wheel stacker reclaimer, intellectuality, communication and administrative skill modernization.Automatically control refers to bucket-wheel stacker reclaimer and realizes unmanned control, monitors the situation of bucket-wheel stacker reclaimer work by supervisory system.The staff piles material extracting operation and various control to bucket-wheel stacker reclaimer in the pulpit in the distance.On the supervision screen in the pulpit, a distant place, can demonstrate the working position of bucket-wheel stacker reclaimer and the diagram of working condition, and be equipped with automatic alarm system.Simultaneously also can understand the various operational factors of bucket-wheel stacker reclaimer and obtain needed data by computing machine by printer.Also people's transport system integral body is Guaranteed in the control of bucket-wheel stacker reclaimer.At present, the fuel-burning power plant of China has only the import equipment of only a few power plant to adopt this method of operation.
Though external control technology has developed into the unpiloted Automatic Control stage, China also carries out research and development in this regard.But technical difficulty is big, installation cost height, the few use.
Chinese patent CN 92218591.3 discloses a kind of convey materials measuring and calculating device, the relation that it is directly proportional with the flow of institute convey materials according to the line current of belt motor, the line current conversion of signals of detected motor is become the DC voltage be directly proportional with it, be converted to pulse signal again and carry out stored count, draw the weight of convey materials.
CN 92218591.3 does not design accurate balancing controls and line rectification device.Do not have accurate balancing controls and can cause belt feeder zero load or flow hour, the measuring and calculating device is accumulated the no-load current of drive motor as weight of material, cause error, this patent is only mentioned with the material on infrared ray or the mechanical means detection belt with literal, and the switch of control measuring and calculating device, the effectively practical zeroing measure of concrete proposition; Do not design linear fairing, it uses a commutation diode to make half-wave rectification in the rectification link, can cause signal voltage hour, because there is the dead band voltage about 0.5v in diode, the voltage after the rectification and the ratio of mass flow produce distortion, strengthen the measuring and calculating error, reduce practicality.
Therefore, CN 92218591.3 patents can only be used as the material measuring and calculating, do not have the function of design discharge demonstration and control external unit, can't directly apply to bucket-wheel stacker reclaimer as control use automatically.
Summary of the invention
As previously mentioned, manual operation is got materials flow amount instability, aborning overload can be taken place and shorten service life of equipment, influence production run, plant factor is reduced; Unreasonable in the semiautomatic control system design of existing cantilever type bucket-wheel reclaimer and have many shortcomings in actual use; And unmanned automatic control system is seldom used in actual production because technical difficulty is big, installation cost is high.
Come fast, realize getting simply, at low cost the automatic control function of material for overcoming above-mentioned defective, the present invention proposes the control device and the control method that are used to the bucket wheel reclaimer of material measuring and calculating.
According to an aspect of the present invention get the material autocontrol method be divided into four steps, its flow process as shown in Figure 6, the first step: current detection module 2 detects corresponding faint ac voltage signal from the line current in bucket wheel current of electric loop 1; Second step: described faint ac voltage signal is transported to current/voltage signal conversion module 3 and carries out the rectifying and voltage-stabilizing processing and amplifying; The 3rd step: be imported into through the described voltage signal of rectifying and voltage-stabilizing processing and amplifying and get material automatic control module 6, get material automatic control module 6 and control slew gear 19 and 20 actions of cart feed mechanism simultaneously according to the variation of described voltage signal; The 4th step: the action of slew gear 19 and cart feed mechanism 20 can cause that again bucket wheel current of electric loop 1 changes, and constitutes a closed-loop control system thus, realizes getting the automatic control function of material.This operating procedure has explained that simultaneously the grade of accompanying drawing 5 measures the circuit working step of the automatic control section in the material closed-loop control technological process.
Preferably, in second step of above-mentioned control method, described faint ac voltage signal is being transported to after current/voltage signal conversion module 3 carries out the rectifying and voltage-stabilizing processing and amplifying, except be imported into get the material automatic control module 6, also told one road voltage signal in addition and be input to and get materials flow amount accumulation tonnage display module 4, obtained flow accumulation tonnage Presentation Function.
Preferably, in second step of above-mentioned control method, described faint ac voltage signal is being transported to after signal conversion module 3 carries out the rectifying and voltage-stabilizing processing and amplifying of signal, except be imported into get the material automatic control module 6, also told one road voltage signal in addition and be input to the super setting value alarm module 5 of flow, thereby realized that flow surpasses the function that setting value is just reported to the police.
According to a further aspect in the invention, provide a kind of above-mentioned control device of getting the material autocontrol method that is used for, comprising: bucket wheel current of electric loop 1; Current detection module 2 is used for detecting corresponding faint ac voltage signal from the line current in bucket wheel current of electric loop 1; Current/voltage signal conversion module 3 is used for receiving from the described faint ac voltage signal of current detection module 2 outputs and carries out the rectifying and voltage-stabilizing processing and amplifying; Get material automatic control module 6, be used for receiving described voltage signal, and send control signal through current/voltage signal conversion module 3 rectifying and voltage-stabilizing processing and amplifying; And slew gear 19 and cart feed mechanism 20, the action of slew gear 19 and cart feed mechanism 20 is to control simultaneously by getting the control signal sent of material automatic control module 6, and the action of slew gear 19 and cart feed mechanism 20 simultaneously can cause that again bucket wheel current of electric loop 1 changes.
Preferably, of the present inventionly be used for the above-mentioned control device of getting the material autocontrol method and also further comprise and get materials flow amount accumulation tonnage display module 4, be used for accepting and handle by current/voltage signal conversion module 3 and carry out voltage signal after the rectifying and voltage-stabilizing processing and amplifying, thereby realize flow accumulation tonnage Presentation Function.
Preferably, of the present invention be used for above-mentioned get the material autocontrol method control device also further comprise the super setting value alarm module 5 of flow, be used for accepting and handle by current/voltage signal conversion module 3 and carry out voltage signal after the rectifying and voltage-stabilizing processing and amplifying, thereby realize that flow surpasses the function that setting value is just reported to the police.
The control device that is used for getting the material autocontrol method of the present invention get material automatic control module 6, comprise: flux lower limit comparer 9, the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage is lower than setting voltage value; Monostalbe trigger 12 is used for receiving the low level by described flux lower limit comparer 9 outputs, and exports a high level pulse by its inner RC decision pulse width; T ' trigger 14, described T ' trigger 14 causes upset by the high level pulse of monostalbe trigger 12 outputs, and the constant just upset again when next high level pulse arrives that maintains the original state; Relay 16, it is by the level signal control of using the output of T ' trigger; Two revolution pilot relays 17 are controlled by the normally closed contact and the normally opened contact of relay 16 respectively; Slew gear 19 is realized rotating and reverse by the contact of described two revolution pilot relays 17 respectively; Two timing relays 18, its power supply circuit join with the other one group of normally closed contact and the normally opened contact of relay 16 respectively, and two time relays 18 are the travel distance of may command cart feed mechanism 20 all; Flow upper limit comparer 8, the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage surpasses setting voltage value; Monostalbe trigger 11 is used for receiving the low level by described flow upper limit comparer 8 outputs, and exports a high level pulse by its internal resistance value and capacitance decision pulse width; Relay 13, its normally closed contact excites action by described high level, cuts off the current supply circuit of revolution pilot relay 17.
The materials flow amount of the getting accumulation tonnage display module 4 that is used for getting the control device of expecting autocontrol method of the present invention, comprise: flow shows 47, is used for converting the voltage signal after amplifying through current/voltage signal converter 3 rectifying and voltage-stabilizings to be complementary with mass flow flow and shows; Rate adjusted electric voltage/frequency converter 45 is used for the pulse that becomes speed to be directly proportional with it the signal voltage transitions after current/voltage signal converter 3 rectifying and voltage-stabilizings amplify; The accumulation tonnage shows 46, is used for the accumulation tonnage demonstration that obtains getting material behind the counting of counter is passed through in the pulse that rate adjusted electric voltage/frequency converter 45 is generated.
The super setting value alarm module 5 of flow that is used for getting the control device of expecting autocontrol method of the present invention, comprise: flow upper limit comparer 8, the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage surpasses setting voltage value; Monostalbe trigger 11 is used for receiving the low level by described flow upper limit comparer 8 outputs, and exports a high level pulse by its internal resistance value and capacitance decision pulse width; Relay 13 excites action by described high level pulse; Alarm 15 causes the normally opened contact closure by described relay (13) action, and triggering reports to the police rings.
On the bucket wheel reclaimer, adopt and of the present inventionly get the material autocontrol method and the material automaton of getting of the present invention is installed, make it possess the automatic material taking function after, can improve and get materials flow amount stability and production efficiency; Reduce apparatus overload generation, prolong service life of equipment, and can alleviate operative employee's labour intensity; During control system when design bucket wheel reclaimer, can install the present invention as function wherein, increase a kind of control mode.
The present invention adopts the size of the original bucket wheel current of electric of bucket wheel reclaimer instrument as Controlling Source decision angle of revolution; The time-delay of adopting the time relay is provided with the decision cart amount of feeding and the control method that need not external detection mechanism cooperates, simple structure, only need in operation room this device is connected by the circuit that designs with hand held console and current instrument and get final product, with original PLC semiautomatic control system independence connection, it is a kind of simple and efficient control device, use cost is low, and remodeling method is simple.
The present invention has designed circuit structures such as accurate zeroing, line rectification, flow demonstration and overload-alarm, and conversion accuracy is improved; Increase for operative employee's reference information; Make the material measuring and calculating be applicable to the material extracting operation of bucket-wheel stacker reclaimer.
Description of drawings
Fig. 1 is the one-piece construction figure of cantilever type bucket-wheel stacker-reclaimer;
Fig. 2 gets material fore-and-aft plane synoptic diagram for the layering of cantilever type bucket-wheel stacker-reclaimer;
Fig. 3 gets the material schematic top plan view for the cantilever type bucket-wheel reclaimer;
Fig. 4 is measured material control algolithm PLC program flow diagram for existing bucket-wheel stacker reclaimer etc.;
Fig. 5 is measured material closed-loop control process chart for bucket-wheel stacker reclaimer of the present invention etc.;
Fig. 6 is an automatic material taking control device functional relationship structure flow chart of the present invention;
Fig. 7 is the material automaton circuit process flow diagram of getting of the present invention;
Fig. 8 is for adopting the synoptic diagram of transforming the embodiment of Baosteel 6# reclaimer according to automatic material taking control device of the present invention.
Embodiment
Come the present invention is further detailed by means of embodiment below:
The size of the bucket wheel drive motor line current of bucket-wheel stacker reclaimer with raw meal particle size, density, get various factorss such as material amount, thickness of feed layer and be associated, in suitability for industrialized production raw material is sieved under the situation of processing and material extracting operation standard, raw meal particle size, density, thickness of feed layer etc. all can keep stable, bucket wheel drive motor electric current only and the scraper bowl shovel get inventory and be directly proportional, this is confirmed the read-around ratio of getting materials flow amount (electronic measuring scale is measured) and bucket wheel galvanometer motor after in production practices.
Control device of the present invention shovels the relation that how much is directly proportional of getting material according to the line current of reclaimer bucket wheel motor with bucket wheel scraper pan, design related circuit, DC voltage and the pulse signal of the line current conversion of signals of detected bucket wheel motor for being directly proportional with it, the flow value that magnitude of voltage after regulate handling and pulse aggregate-value are the material of getting and accumulate the tonnage value reaches the corresponding function of electronic measuring scale.
The present invention proposes a kind of improved material control flow design (seeing accompanying drawing 5) of getting, and mentality of designing is: original semi-automatic open loop control mode (seeing accompanying drawing 4) of getting the materials flow journey, change into the closed-loop control of mass flow as feedback quantity.In case bucket wheel is got less than material owing to cantilever produces the stockpile scope, make and get the materials flow amount and descend rapidly.When the bucket wheel current of electric drops to setting value, trigger control circuit in time allows revolution move round about, a segment distance that allows the feeding of cart feed mechanism set simultaneously, just can make bucket wheel continue to get material, the bucket wheel current of electric rises, when revolution moves to when exceeding the stockpile other end, control circuit repeats said process again.Uprush and cause the bucket wheel current of electric also to be uprushed when the stockpile flow that causes such as cave in, control circuit can make revolution stop and warnings of sounding after obtaining the excessive signal of flow, waits flow to recover to recover revolution again after normal and normally moves.Constitute the feedback and the round-robin closed-loop control of signal thus, make and get the materials flow amount and remain on and set between the flow upper and lower bound, realize waiting and measures the material operation automation.
In production practices, find because the bucket wheel disc face with respect to the horizontal plane is not at right angles, but slight angle of inclination is arranged, so that material is poured onto discharge hopper.This structure causes there are differences getting when material flow: under the identical situation of cart feeding distance, when revolution is rotated towards bucket wheel disc face vergence direction, scraper bowl is toppled over material that material spills is constituted flow in the scraper bowl again increment, and does not have this increment during reversed turning.Feeding distance is identical and difference gyratory directions can cause getting the materials flow amount certain difference.Use two time relays that can set cart feeding time value separately, make the asynchronous cart feeding distance of gyratory directions also produce certain difference, then can offset and get materials flow amount difference, realize getting the highly stable of materials flow amount.
Get the concrete device that each step relates in the material automaton functional relationship structure in order to illustrate, briefly introduce the corresponding relation between the functional relationship structural drawing of accompanying drawing 7 circuit block diagrams and accompanying drawing 6: Fig. 6 is corresponding one by one with bucket wheel current of electric loop 1, current detecting 2, conversion of signals 3 among Fig. 7; The materials flow amount of getting accumulative total tonnage display module 4 among Fig. 6 shows 47 parts corresponding to the conversion of the rate adjusted voltage/frequency among Fig. 7 45, accumulative total tonnage demonstration 46, flow; Flow among Fig. 6 surpasses setting value alarm module 5 corresponding to flow upper limit comparer 8, monostalbe trigger 11, relay 13, warning horn 15 among Fig. 7; Getting among Fig. 6 expects that automatic control module 6 is corresponding to the flow upper limit comparer 8 among Fig. 7, flux lower limit comparer 9, monostalbe trigger 11, monostalbe trigger 12, relay 13, T ' trigger 14, relay 16, revolution pilot relay 17, timing relay 18; Slew gear 19 among Fig. 6 and Fig. 7 and cart feed mechanism 20 are corresponding mutually.
The principle of work of this device is from circuit block diagram 7 as can be seen:
The line current of bucket wheel motor is converted to the faint alternating voltage that is directly proportional with it by current detection module 2, rectifying and voltage-stabilizing through current/voltage signal converter 3 amplifies, become the direct current millivolt voltage signal that is complementary with mass flow, on digital voltmeter, show 47 as flow.
Meanwhile, signal voltage is admitted in the rate adjusted electric voltage/frequency converter 45, the pulse that signal voltage transitions becomes speed to be directly proportional with it, obtains getting the accumulation tonnage demonstration 46 of material behind the process counting of counter.
Above-mentioned design can realize the corresponding function of material measuring and calculating; And the mentality of designing of saying below is will realize the flow warning and get material control automatically.
Signal voltage input flow rate lower limit comparer 9, compare with predefined magnitude of voltage, in case make bucket wheel scraper pan can't shovel enough materials owing to the slew gear rotation makes bucket wheel move to the stockpile edge, the bucket wheel current of electric descends, corresponding signal voltage also can descend, when it is lower than setting voltage value, the lower limit comparer is promptly exported a low level to monostalbe trigger 12 (low level triggering), it exports a high level pulse by its internal resistance value and capacitance decision pulse width immediately, the use of monostalbe trigger is the follow-up circuit erroneous action that causes for the fluctuation that prevents by signal voltage, pulse width must be changed direction greater than revolution and be caused the time width that flow descends, behind end-of-pulsing,, cause follow-up circuit erroneous action with regard to not exporting pulse once more owing to signal voltage still is lower than setting value.This high level makes 14 upsets of T ' trigger, when high level pulse finishes to skip back to low level, T ' trigger can maintain the original state constant, wait for just upset again when next high level pulse arrives, use the level signal pilot relay 16 of T ' trigger output, the normally closed contact of relay 16 and normally opened contact are controlled two revolution pilot relays 17 respectively, and the contact of two revolution pilot relays 17 is connected into the form that slew gear 19 is rotated and reverse respectively, can reach the adhesive of using a relay or the purpose of the control slew gear 19 change directions that reset.The other one group of normally closed contact and the normally opened contact of relay 16 are connected to respectively in the power supply circuit of two timing relays 18, two timing relays 18 are the may command cart feed mechanism 20 one section respective distance that is directly proportional with the setting-up time value of advancing all, realizes the automatic control of the cart feeding distance that is complementary with gyratory directions.Like this, when slew gear 19 is changed direction, cart feed mechanism 20 certain distance of also advancing, when the electric current of bucket wheel motor can be got material again and rises owing to scraper bowl, flux lower limit comparer 9 output high level, monostalbe trigger 12 is the rebound low level after finishing the high level that one of output has certain pulse width, enters stable state, prepares for triggering next time.
Again signal voltage input flow rate upper limit comparer 8, compare with predefined voltage, in case surpass setting voltage, flow upper limit comparer 8 is promptly exported a low level to monostalbe trigger 11, and it exports a high level pulse by its internal resistance value and capacitance decision pulse width immediately.This high level pulse makes relay 13 actions, its normally opened contact closure, alarm 15 is got, send chimes of doom, remind the operative employee to surpass rated flow, meanwhile, the action of relay 13 disconnects its normally closed contact, cuts off the current supply circuit of revolution pilot relay 17, slew gear 19 is stopped, when mass flow drops to below the setting value, and pulse output also skips back to low level by high level, and warning horn stops sounding, relay resets, connect the current supply circuit of rotation controller, revolution is restarted, and continues to get material.
Multichannel variable voltage source 10 is set for the upper limit, lower limit comparer, zeroing and analogue flow rate the stable 0-2.5V voltage that can regulate is provided.Selector switch 24 can be selected signal voltage or simulating signal, and when selecting simulating signal, the size of regulating simulating signal can provide the analog stream value for the upper limit, lower limit flow set, is convenient to determining of setting value.Power supply 21 offers subsequent conditioning circuit after handling through voltage regulation filtering 22.
Specific embodiment
Referring to accompanying drawing 8, adopt the synoptic diagram of transforming Baosteel 6# reclaimer according to automatic material taking control device of the present invention, be in principle can carry out manually, the switching fast and safely between automatically.Find out from figure, between slew gear 19 and its operation circuit input end, original manual operation switch and automatic control relay 17 are in state in parallel, can turn round manually by manual, automatic transfer switch, switch automatically, after switching to automated location, the revolution manual operation switch is inoperative, can not cause the short circuit of circuit in the time of can guaranteeing manually or automatically to operate owing to improper operation (for example automatically forward operation and manually be allocated to inverted running because of carelessness).Between cart feed mechanism 20 and its operation circuit input end, original manual operation switch and automatic control relay 18 are in series connection, can be carried out cart feeding hand, be switched automatically by short circuiting switch.When selecting the cart feeding automatic, need earlier short circuiting switch to be disconnected, again manual operation switch is allocated to the slow-motion position in advance, just connects the slow-motion operation circuit in advance, automaton can be controlled the start-stop of reclaimer cart feeding by the break-make of relay 18; Select when manual, the short circuiting switch closure is fallen automatic control relay 18 short circuits, makes it inoperative.
When equipment debugging, manually obtaining under the situation of stablizing mass flow and the operator of raw material control center in time gets in touch, relatively their the mass flow information (obtaining on the belt electronic measuring scale) that provides and the difference and the timely adjustment of this device flow value repeatedly is till basic identical.The design discharge of considering this reclaimer is that 1200t/h can be the overload-alarm setting value of flow upper limit comparer 8 greater than ratings about 30%, i.e. 1500t/h.In order to allow slew gear when bucket wheel turns round to the stockpile edge, can in time carry out reversed turning, prevent to shovel and get the material appearance intermittently, to enhance productivity, the comparison setting value of signal voltage input flow rate lower limit comparer 9 can be made as 500t/h, it is the mass flow time revolution inverted running that drops to 500t/h, simultaneously cart also can one section setpoint distance of feeding, guarantees that the continous-stable of material is obtained.
This device circuit is simple, and is cheap, and it is little to transform difficulty, as long as carry out current transformer and the inner signal anti-interference method of this device, just can realize the function of expecting smoothly.The mass flow information that provides with control center compares, and error is about ± 8%, and this can be used as mass flow fully, gets and expect that tonnage and the reference signal of controlling automatically are used in actual production.The automatic control transformation of carrying out on 6# bucket wheel reclaimer obtains promising result.
Automatically control transformation on the bucket wheel reclaimer of different model, electric wiring needs to do along with the difference of original design corresponding adjustment, as relay contact what and often open, the selection of normally closed contact etc.
Should be understood that; embodiments of the invention just are used to illustrate the present invention rather than restriction the present invention; the details that the invention is not restricted to describe herein is under the prerequisite of spirit that does not break away from claims of the present invention and aim, and other that those skilled in the art will find apparent that replaced structure and all will be dropped in the claim protection domain of the present invention.
Claims (9)
1. the control method with the bucket wheel reclaimer of material measuring and calculating comprises the steps:
Current detection module (2) detects corresponding faint ac voltage signal from the line current in bucket wheel current of electric loop (1);
Described faint ac voltage signal is sent to current/voltage signal conversion module (3) carries out the rectifying and voltage-stabilizing processing and amplifying;
To be sent to through the described voltage signal of rectifying and voltage-stabilizing processing and amplifying and get material automatic control module (6), and get material automatic control module (6) and control slew gear (19) and cart feed mechanism (20) action simultaneously according to the variation of described voltage signal;
The action of slew gear (19) and cart feed mechanism (20) causes that bucket wheel current of electric loop (1) changes, and constitutes a closed-loop control system thus.
2. the control method of the bucket wheel reclaimer of band material measuring and calculating as claimed in claim 1, wherein, get the material automatic control module (6) except being sent to through the described voltage signal of rectifying and voltage-stabilizing processing and amplifying, also told one road voltage signal in addition and be input to and get materials flow amount accumulation tonnage display module (4).
3. the control method of the bucket wheel reclaimer of band material measuring and calculating as claimed in claim 1 or 2, wherein, get the material automatic control module (6) except being sent to through the described voltage signal of rectifying and voltage-stabilizing processing and amplifying, also told one road voltage signal in addition and be input to the super setting value alarm module of flow (5).
4. be used for control device, comprise as the control method of the bucket wheel reclaimer of each described band material measuring and calculating of claim 1 to 3:
Bucket wheel current of electric loop (1);
Current detection module (2) is used for detecting corresponding faint ac voltage signal from the line current in bucket wheel current of electric loop (1);
Current/voltage signal conversion module (3) is used for receiving from the described faint ac voltage signal of current detection module (2) output and carries out the rectifying and voltage-stabilizing processing and amplifying;
Selector switch (24) can be selected signal voltage or simulating signal;
Get material automatic control module (6), be used for receiving and handle described voltage signal, and send control signal through current/voltage signal conversion module (3) rectifying and voltage-stabilizing processing and amplifying;
Slew gear (19) and cart feed mechanism (20), the action of slew gear (19) and cart feed mechanism (20) is to control simultaneously by getting the control signal sent of material automatic control module (6), and the action of slew gear (19) and cart feed mechanism (20) simultaneously can cause that again bucket wheel current of electric loop (1) changes; And
Multichannel variable voltage source (10) can be described control device stable adjustable voltage is provided.
5. control device as claimed in claim 4, wherein, the described material automatic control module 6 of getting comprises:
Flux lower limit comparer (9), the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage is lower than setting voltage value;
Monostalbe trigger (12) is used for receiving the low level by described flux lower limit comparer (9) output, and exports a high level pulse by its internal resistance value and capacitance decision pulse width;
T ' trigger (14), described T ' trigger (14) causes upset by the high level pulse of monostalbe trigger (12) output, and the constant just upset again when next high level pulse arrives that maintains the original state;
Relay (16) is by the level signal control of T ' trigger output;
Two revolution pilot relays (17) are controlled by the normally closed contact and the normally opened contact of relay (16) respectively;
Slew gear (19) is realized rotating and reverse by the contact of described two revolution pilot relays (17) respectively;
Two timing relays (18), its power supply circuit join with the other one group of normally closed contact and the normally opened contact of relay (16) respectively, and two time relays (18) are the travel distance of may command cart feed mechanism (20) all;
Flow upper limit comparer (8), the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage surpasses setting voltage value;
Monostalbe trigger (11) is used for receiving the low level by described flow upper limit comparer 8 outputs, and exports a high level pulse by its internal resistance value and capacitance decision pulse width;
Relay (13), its normally closed contact excites action by described high level, cuts off the current supply circuit of revolution pilot relay (17).
6. control device as claimed in claim 5, wherein, also comprise and get materials flow amount accumulation tonnage display module (4), be used for accepting and handle by current/voltage signal conversion module (3) and carry out voltage signal after the rectifying and voltage-stabilizing processing and amplifying, obtain getting materials flow amount accumulation tonnage and show.
7. control device as claimed in claim 6, wherein, the described materials flow amount accumulation tonnage display module (4) of getting comprising:
Flow shows (47), is used for converting the voltage signal after amplifying through current/voltage signal converter (3) rectifying and voltage-stabilizing to be complementary with mass flow flow and shows;
Rate adjusted electric voltage/frequency converter (45) is used for the pulse that becomes speed to be directly proportional with it the signal voltage transitions after current/voltage signal converter (3) rectifying and voltage-stabilizing amplifies;
The accumulation tonnage shows (46), is used for the accumulation tonnage that pulse that rate adjusted electric voltage/frequency converter (45) is generated obtains getting the materials flow amount after through counting to show.
8. as each described control device of claim 5 to 7, wherein, also comprise the super setting value alarm module of flow (5), be used for accepting and handle by current/voltage signal conversion module (3) and carry out voltage signal after the rectifying and voltage-stabilizing processing and amplifying, and when the super setting value of flow the generation alerting signal.
9. control device as claimed in claim 8, wherein, the super setting value alarm module of described flow (5) comprising: flow upper limit comparer (8), the signal voltage that is used for being imported is compared with predefined magnitude of voltage, and exports a low level when described signal voltage surpasses setting voltage value;
Monostalbe trigger (11) is used for receiving the low level by described flow upper limit comparer (8) output, and exports a high level pulse by its internal resistance value and capacitance decision pulse width;
Relay (13), its normally closed contact and normally opened contact excite action by described high level pulse;
Alarm (15), its normally opened contact causes closure by relay (13) action, triggering reports to the police rings.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100331352A CN101493676A (en) | 2008-01-25 | 2008-01-25 | Control method and control device for bucket wheel material fetching machine with material measure and calculate |
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| CNA2008100331352A CN101493676A (en) | 2008-01-25 | 2008-01-25 | Control method and control device for bucket wheel material fetching machine with material measure and calculate |
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| CN101493676A true CN101493676A (en) | 2009-07-29 |
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| CN104020791A (en) * | 2014-04-23 | 2014-09-03 | 中国神华能源股份有限公司 | Reclaiming flow stability control device and method of coal stockyard |
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| CN106743722A (en) * | 2017-02-17 | 2017-05-31 | 中国神华能源股份有限公司 | The control method of reclaimer system coal blending |
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| CN107544565A (en) * | 2017-09-26 | 2018-01-05 | 泰富国际工程有限公司 | A kind of reclaimer feeding flow control methods and feeding flow control system |
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