CN101323890A - Converter oxygen lance anti-fall device and control method - Google Patents
Converter oxygen lance anti-fall device and control method Download PDFInfo
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- CN101323890A CN101323890A CNA2008100485897A CN200810048589A CN101323890A CN 101323890 A CN101323890 A CN 101323890A CN A2008100485897 A CNA2008100485897 A CN A2008100485897A CN 200810048589 A CN200810048589 A CN 200810048589A CN 101323890 A CN101323890 A CN 101323890A
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Abstract
The invention relates to an anti-dropping device of a converter oxygen lance and a control method thereof. The anti-dropping device comprises a frequency converter, an oxygen lance electric machine and a band-type brake controlled by the frequency converter and a PLC controller. The frequency converter and the PLC are communicated through network and all important interlocking conditions are sent to the frequency converter directly through a hard connecting wire. The invention adopts a safety logistic control method of combining soft and hard wares of the PLC and the frequency converter, completely independent control loop of band-type brake circuit, safe switch-on and switch-off of the band-type brake logic, safe frequency converter withdrawal enabling logic, and real-time protection of position model calculation, and adopts oxygen lance lower limit position hard connecting wire softening logistics to carry out protection, thus realizing the anti-dropping control of the oxygen lance. The invention has advantages of simplicity, reliability, stable operation, rigorous and considerable safety interlocking, etc., thus offsetting the disadvantages of traditional oxygen lance electric control system on production, equipment and personal injury caused by frequent lance dropping.
Description
Technical field
The present invention relates to metallurgy industry process for making oxygen rifle elevator lifting device, especially relate to the electric control system that is used for converter oxygen lance anti-fall.
Background technology
Converter oxygen gun elevator lifting device belongs to the potential load, and in the blowing technology operation, the oxygen rifle need be done frequent moving and the location.Because Oxygen Furnace Steel belongs to high temperature, high pressure, big flow gas operation, as false command or communication occur and disturb and cause the flase operation of oxygen rifle, rifle or oxygen rifle take place to weigh down slip rifle at low level and then may blast, cause equipment and personnel safety accident.Therefore the oxygen rifle also more needs the tighter safety interlocking and the operation condition of anti-falling stop rifle except needs are accurately located.
There is following shortcoming in existing oxygen gunlock structure: though 1, oxygen rifle band-type brake adopted the double embrace lock, two band-type brakes are connected in parallel on a control loop, have only the output of one road electric loop, and the contact of band-type brake contactor do not feed back to frequency transformer yet.2, not to oxygen rifle band-type brake install in the erecting stage feedback band-type brake truly open and close situation near switch.3, oxygen rifle smallest limit mechanical position limitation signal is not caused frequency transformer, oxygen rifle smallest limit mechanical position limitation signal just is connected to PLC control, in case break down, trouble signal is given frequency transformer after being handled by PLC again, can't guarantee real-time.4, steel wire rope tension is not detected, can't guarantee wire cable rupture is caused the real time reaction of this abominable accident of weighing down rifle.5, too high to the rifle higher position dependency of encoder feedback, in case encoder fault can not make accurate judgment to oxygen rifle position.
Summary of the invention
Technical problem to be solved by this invention provides a kind of converter oxygen lance anti-fall device and control method, this device and control method can prevent that the block rifle weighs down the generation of rifle accident, make oxygen rifle transmission apparatus be in good safety in production state, thereby can improve the security of oxygen rifle operation effectively.
For solving the problems of the technologies described above, the technical scheme that a kind of converter oxygen lance anti-fall device provided by the invention adopted is: a kind of converter oxygen lance anti-fall device, comprise frequency transformer, oxygen rifle motor and band-type brake is characterized in that: also comprise programmable logic controller PLC, described PLC be used to control described frequency transformer startup, stop, speed is given, the open and close of band-type brake, frequency transformer is removed and is enabled, and described frequency transformer is installed communication board, by this communication board and described plc communication.
Further improved, the master loop switch of described frequency transformer has first secondary contact, and these first secondary contact are connected on the described band-type brake control loop.
Further improved again, the break-make of the band-type brake control loop of described frequency transformer is controlled to be intermediate relay, the coil of described intermediate relay is connected on the switchboard of described frequency transformer, the secondary contact of described intermediate relay are connected on the control loop of described band-type brake, when described intermediate relay coil gets when electric the secondary contact closure of described intermediate relay.
Further improved again, the contactor of described band-type brake has second secondary contact, and these second secondary contact enter on the described Frequency Converter Control plate.
As prioritization scheme, the smallest limit position guard signal hardwire of described oxygen rifle inserts described frequency transformer, and described smallest limit position guard signal is forbidden the interlocking condition that oxygen rifle motor is descending as frequency transformer.
As another prioritization scheme, near switch, this connects described Frequency Converter Control loop near switch signal by signal wire, removes the interlocking condition that enables as described frequency transformer in the other installation of the on-the-spot hydraulic push rod connecting rod of described band-type brake.
Simultaneously, the present invention also provides a kind of converter oxygen lance anti-fall control method: it is characterized in that its oxygen rifle position monitoring control process may further comprise the steps:
A-1: frequency transformer brings into operation, and described PLC is by its interruptable controller, with the frequency transformer travelling speed of certain scanning period scanning;
A-2: in each scanning period, calculate the change in location value and the oxygen rifle calculated location value of oxygen rifle, wherein:
The change in location value of oxygen rifle=current frequency transformer travelling speed multiply by the scanning period duration,
The oxygen rifle was remembered the change in location value of oxygen lance position+oxygen rifle calculated location value=last time; In the formula, remembering oxygen lance position last time is the oxygen rifle calculated location value of calculating in the last scanning period;
A-3: the oxygen rifle rifle height value of the encoder actual feedback of more current oxygen rifle calculated location value and frequency transformer; when the difference between the two is less than or equal to the position difference upper limit parameter of setting; system can normally move by processing condition always; when this difference surpasses this position difference upper limit parameter; promptly be considered as the oxygen rifle and fall rifle, trigger the urgency of frequency transformer immediately and shut down logic.
As further improvement; it also comprises steel wire rope tension detection controlling alarm process; may further comprise the steps: described PLC detects the tension force of oxygen rifle motor wireline in service in real time in each scanning period; when this tension force during greater than the tension force upper limit parameter of setting or less than the tension force lower limit parameter set; described steel wire rope tension detection unit triggers the frequency transformer shutdown procedure immediately, and sends guard signal.
As further improving again, it is characterized in that its open and close band-type brake control may further comprise the steps:
B-1: described PLC sends normal enabled instruction, frequency transformer enables, frequency transformer judges whether outward current reaches the setting current parameters of motor rated current, be, and when frequency transformer does not detect the wireline warning, on the Frequency Converter Control loop open band-type brake switch intermediate relay get electric, described band-type brake control loop intermediate relay main switch closure, band-type brake is opened;
B-2: when oxygen rifle operation arrived target bit, described PLC sent out stop signal to frequency transformer, and frequency transformer is motor actual feedback speed and given rotating speed parameter relatively, when motor actual feedback speed during less than the given rotating speed parameter, carried out the pass band-type brake;
B-3: receive wireline when described PLC or frequency transformer and report to the police, suddenly stop, during any one signal in the protection of smallest limit position, frequency transformer inner/outer fault alarm that frequency transformer closes band-type brake immediately.
As further improving again; it is characterized in that frequency transformer remove enable control may further comprise the steps: described frequency transformer is received the conventional halt command that PLC sends; judge whether the motor actual speed signal is " 0 " signal; be; and receive the described pilot contactor contact cut-off signal in the band-type brake control loop; and described during near switch closure signals, frequency transformer removes and enables.
Further the scheme of optimizing is, its oxygen rifle is descending forbids that control may further comprise the steps: when frequency transformer brings into operation, read the oxygen lance position of current encoder feedback in each scanning period, the oxygen lance position of more described current encoder feedback and the oxygen lance position smallest limit parameter value of setting, if the oxygen lance position of described current encoder feedback is during less than described smallest limit parameter value, descending forbidding of Frequency Converter Control oxygen rifle; And/or when described frequency transformer was received described smallest limit guard signal, frequency transformer controlled immediately that the oxygen rifle is descending to be forbidden.
The control loop of described band-type brake is an individual electrical loop.
The present invention compares with traditional control techniques, has following main advantage:
One, apparatus of the present invention are simple and reliable for structure, can reduce the manual maintenance amount, reduce accident rate, prolong the work-ing life of oxygen rifle.
Two, can prevent effectively that the block rifle falls rifle " slide rifle ", improve processing safety, reduction equipment and fatal accident.
Three, the generation of mechanical accidents such as anticipation band-type brake or wire cable rupture fast.
It is more steady four, can to make the oxygen rifle start, stop the location, has reduced the impact to machinery.
Five, owing to the development of national economy, to the state of the art of steel-making and the requirements at the higher level of security level, so this Controlling System has vast market prospect.
In sum, the present invention have simple and reliable, reduce accident rate, improve advantages such as processing safety.Solved traditional oxygen rifle control mode (data are all by network or all by hard wired mode) effectively, the oxygen rifle weighs down the high shortcomings of security incident incidence such as rifle.
Description of drawings
Below in conjunction with the drawings and the specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is a converter oxygen lance anti-fall device logical schematic of the present invention.
Fig. 2 is the convertible circuit figure of converter oxygen lance anti-fall device of the present invention, and present embodiment is an example with the siemens 6SE70 frequency transformer after improving.
Fig. 3 is an oxygen rifle double embrace lock independent controling circuit synoptic diagram provided by the invention.
Fig. 4 is the band-type brake logic control flow process figure that opens of the present invention.
Fig. 5 is pass band-type brake logic control flow process figure of the present invention.
Fig. 6 is that frequency transformer of the present invention is removed enable logic control synoptic diagram.
Fig. 7 is an oxygen rifle position monitoring control flow chart of the present invention.
Fig. 8 is the descending logic control flow process synoptic diagram of forbidding of oxygen rifle of the present invention.
Fig. 9 is a steel wire rope tension detection controlling alarm process flow diagram flow chart of the present invention.
Embodiment
As shown in Figure 1, oxygen lance anti-fall device provided in the present embodiment comprises frequency transformer 101, oxygen rifle motor 103, band-type brake 104, also increase and joined programmable logic controller PLC 102, PLC 102 is connected with oxygen rifle motor 103 with frequency transformer 101 respectively, realize data exchange, and be used for the operation of control of conversion device 101 and oxygen rifle motor 103.Frequency transformer 101 is connected with band-type brake 104, and the open and close band-type brake of control band-type brake 4, is connected with oxygen rifle motor 103 when band-type brake 4 closes band-type brake.
Convertible circuit figure as shown in Figure 2, frequency transformer is a siemens 6SE70 vector type frequency transformer, the DC24V power supply is the external direct current 24V of a frequency transformer power supply, be equipped with the CBP2 communication board, the PLC of the control of conversion device described in Fig. 1 utilizes the siemens CPU416 controller that has been equipped with on the oxygen rifle to realize the PLC function by programming, between frequency transformer and the PLC by the Profibus-DP net realize comprising that speed is given, the communication of control word, status word.By X448 bus grafting CBP2 communication board, CBP2 is the Profibus-DP communication board on the SOLT in Frequency Converter Control loop C interface, is connected to frequency transformer by the DP main website of oxygen rifle main control PLC system, is connected to frequency transformer No. 2 by current frequency transformer again.B11 is the motor speed feedback coder, is the necessaries that frequency transformer carries out speed closed loop control.
On 3, No. 4 interfaces of Frequency Converter Control loop X101/CUVC plate, be connected to intermediate relay KM11, the KM12 of control band-type brake respectively, contact KM11, the KM12 of intermediate relay KM11, KM12 is connected on the band-type brake pilot circuit loop, referring to shown in Figure 3.Intermediate relay KM11, KM12 are respectively as two safe internal contracting of oxygen rifle motor---first band-type brake, second band-type brake drive the band-type brake trip switch.Polyphone meets secondary contact K21, K22 on No. 5 interfaces of Frequency Converter Control loop X101/CUVC plate, and secondary contact K21, K22 are respectively the secondary contact of the main contactor of first band-type brake, second band-type brake.Polyphone is installed respectively near switch S 31, S32 by the on-the-spot hydraulic push rod connecting rod of first band-type brake, second band-type brake near switch S 31, S32 on No. 6 interfaces of Frequency Converter Control loop X101/CUVC plate.The second secondary contact K21, K22, close the trip switch that band-type brake is confirmed as first, second band-type brake simultaneously near switch S 31, S32.Polyphone point of contact K41, K42 on No. 7 interfaces of Frequency Converter Control loop X101/CUVC plate, K41, K42 are respectively the semaphore switches of oxygen rifle smallest limit and super smallest limit, K41, K42 are normally closed, and when oxygen rifle smallest limit and super smallest limit signal occurring, K41, K42 open.Point of contact K51 on No. 8 interfaces of Frequency Converter Control loop X101/CUVC plate, K51 is normally closed, is oxygen rifle motor emergent stop signal amount switch.On 15, No. 16 interfaces of Frequency Converter Control loop X102/CUVC plate, connected a steel wire rope tension signal from the output of PLC module, No. two steel wire rope tension signals on 17, No. 18 interfaces of Frequency Converter Control loop X102/CUVC plate, have been connected from the output of PLC module, this signal is the analog voltage signal of 0～10v all as the switch signal amount of control of conversion device.
Oxygen rifle double embrace lock independent controling circuit as shown in Figure 3, wherein the figure left side (a) is master loop, the right (b) is control loop.Q41 is a band-type brake master loop isolating switch, and K21 is the contactor of band-type brake one master loop control break-make, and F41 is band-type brake one a master loop hot protective relay, and K22 is the contactor of band-type brake two master loops control break-make, and F42 is band-type brake two master loop hot protective relays.Q42 is the control loop isolating switch, K1 is frequency transformer inlet wire contactor secondary contact, contact KM11 is the main switch of intermediate relay of the control first band-type brake opening/closing of frequency transformer output, and contact KM12 is the main switch of intermediate relay of control band-type brake two opening/closings of frequency transformer output.
The control method of the included oxygen lance anti-fall device of the present invention is below described:
(1) opens the band-type brake logic control: when starting, because the oxygen rifle is the potential load, in order to prevent that the slide frequency transformer must be set up certain staring torque under the rifle position in system.After receiving the PLC system action command, frequency transformer promptly begins to enable and by the ramp generator given speed of setting, outward current reach the motor rated current 25% after, this moment, initial moment was set up substantially.As long as system does not detect wireline this moment and reports to the police, frequency transformer promptly outputs signal to the two independent intermediate relay of control band-type brake contactor, and band-type brake gets electric opening.As shown in Figure 4 open band-type brake logic control flow process figure, step 201, the chain condition that PLC will normally start send frequency transformer, frequency transformer begins conventional operation/enable logic, step 202 judges whether that frequency transformer enables then, i.e. the invertor pulse of frequency transformer discharges; If whether step 203 detects outward current greater than 25% of motor rated current, if step 204 detects whether steel wire rope tension is reported to the police, if step 205 is opened band-type brake.If above institute has one in steps for not, then step 206 is not opened band-type brake, points to band-type brake and closes logic.
(2) close the band-type brake logic control: PLC control is sent out stop signal to frequency transformer when the operation of oxygen rifle arrives target bit, in case motor actual feedback speed is less than the specified speed of motor 5%.It is other that band-type brake is enjoyed lowest priority, receive that wireline is reported to the police, suddenly stopped, band-type brake was cast aside other conditions and is closed immediately when frequency transformer inner/outer fault and position model departed from objectives and report to the police etc. arbitrarily one of condition, even also be band-type brake immediately for the safety motor frequency transformer that runs up this moment.Cause frequency transformer to trip for frequency converter failure or other conditions simultaneously,, can guarantee double embrace lock power-failure close immediately as long as the frequency transformer main contactor disconnects the hardwire loop owing to be connected in series the contact of frequency transformer main contactor in the double embrace lock control loop.Pass band-type brake logic control flow process figure as shown in Figure 5.Step 301, step 302,304,305 is carried out in the motor operation this moment respectively.Step 302 compares the difference of motor position calculated value and actual value, carries out step 303 and judges that difference whether greater than 250mm, is, then carry out step 307, starts to close the band-type brake logic.Step 304, frequency transformer self detect and judge whether to occur external fault and internal fault, if, then carry out step 307, start and close the band-type brake logic.Step 305, judge whether to occur conventional out of service/emergent stop signal, conventional out of service/emergent stop signal is meant and satisfies being sent to normally stopping of frequency transformer or suddenly stopped condition by PLC of various chain conditions in the technological operation of oxygen rifle, if, carry out step 306, judge whether the motor actual speed less than 5% of specified speed, if, then carry out step 307, start and close the band-type brake logic.In the above-mentioned steps, if arbitrary being judged as not then can not start and close the band-type brake logic.
(3) frequency transformer safety is removed and enabled control: the phenomenon of slipping down when guaranteeing safety and guaranteeing that the oxygen rifle stops to take place; after receiving conventional halt command; judge that motor speed must receive that actual speed equals " 0 " signal (actual be by less than 2% motor specified speed); the contacts of contactor that must receive two band-type brake independence electric control circuits simultaneously is cut-off signal; must receive simultaneously on-the-spot two near switch closure signal; be installed in on-the-spot band-type brake hydraulic push rod connecting rod place near switch, the reaction band-type brake truly opens and closes situation.Frequency transformer removed and enables after above all conditions satisfied, invertor pulse blocking, and the oxygen rifle changes over to and relies on the mechanical hatching gate stationary state fully.Since multiple protective is arranged, can flase operation even the abnormal conditions frequency transformer takes place yet.Such as, for recurrent contactor adhesion scene, because this moment, contacts of contactor still can send cut-off signal, but actual band-type brake still the electric open mode that is in, because this Controlling System is a double embrace lock independent loop, even another contactor of contactor adhesion still can work, and can not send the band-type brake shutdown signal near switch yet, enable thereby make frequency transformer can not receive whole chain logics and can not remove for that band-type brake scene of contactor adhesion.Frequency transformer is not removed and is enabled, and motor still is in the state of exerting oneself, and speed ring is still in running order, like this with regard to effectively stopped owing to beyond take place the rifle accident.Fig. 6 removes the enable logic synoptic diagram for frequency transformer, and at first step 401 start to be closed the band-type brake logic, and step 402 judges whether that the motor actual speed signal is " 0 " signal then, if not, step 412 then, non-the removing of frequency transformer enables; If, then carry out step 403 respectively, judge whether the first band-type brake contactor contact disconnects, step 404 judges whether that first band-type brake is near switch closure, step 405, judge whether the second band-type brake contactor contact disconnects, step 406 judges whether that second band-type brake is near switch closure.Step 403,404 judgement output true-false value by step 407 and computing, whether first band-type brake is closed band-type brake confirms; Simultaneously, step 405,406 judgement output true-false value by step 408 and computing, whether second band-type brake is closed band-type brake confirms; Step 407,408 judgement output true-false value by step 409 and computing, whether first, second band-type brake is closed band-type brake simultaneously confirms, step 410, whether the output of determining step 409 is true, if, then carry out step 411, frequency transformer is removed and is enabled, otherwise, step 412, non-the removing of frequency transformer enables.
(4) oxygen rifle position monitoring control: frequency transformer brings into operation; then the PLC controller is initiated the periodic interrupt signal by its interrupt control block; time interrupt cycle is 20ms; in each interrupt cycle; PLC reads the oxygen lance position of DB data block memory last time; multiply by the theoretical position changing value of sweep time=scanning period with the frequency transformer travelling speed of each scanning; current oxygen rifle was remembered the theoretical position changing value of oxygen lance position+scanning period calculated value=last time; oxygen rifle rifle height value with current oxygen rifle calculated value and encoder actual feedback compares then; if difference is less than 250mm; then system can normally move by processing condition always; in case promptly be considered as rifle but difference surpasses 250mm, trigger the anxious logic of shutting down immediately.Fig. 7 is an oxygen rifle position monitoring control flow chart; beginning step 501 frequency transformer is in service; step 502 then; calculate oxygen rifle position calculation value; step 503; read oxygen rifle previous position; this oxygen rifle previous position is the oxygen rifle rifle head calculated value of last scanning period of storing in the DB data block in the PLC controller, and step 504 is calculated oxygen rifle calculated location value; step 505; comparing calculated location value and encoder feedback positional value, does step 506 judge that difference is greater than 250mm? if; then step 507 enters the shutdown processing logic.
(5) the oxygen rifle is descending forbids logic control: after frequency transformer brings into operation, the PLC controller all reads the oxygen lance position of current encoder feedback in each scanning period, continuous and oxygen rifle smallest limit set(ting)value compares, if oxygen rifle smallest limit set(ting)value=current liquid steel level height+750mm, in case the oxygen rifle absolute altitude that reads is less than the smallest limit set(ting)value, frequency transformer descends to the oxygen rifle immediately and forbids, that is to say that the oxygen rifle can only rise and can not descend this moment.On the other hand because mechanical smallest limit and following ultralimit are caused frequency transformer simultaneously, in case smallest limit or down ultralimit any one send actuating signal, this moment, how many rifle height regardless of oxygen rifle encoder feedback was, frequency transformer descends simultaneously and forbids.The software and hardware double insurance has guaranteed that the oxygen rifle can and not insert in the molten steel above smallest limit like this.Situation about losing efficacy for mechanical position limitation has the smallest limit of computed in software to shield, and for the wrong situation in actual rifle position wrong because of the encoder feedback data or that other interference cause, this moment, mechanical position limitation can also shield.Fig. 8 is the descending logic control flow process synoptic diagram of forbidding of oxygen rifle, beginning step 601, and the frequency transformer operation, step 602 reads current oxygen rifle rifle head position, promptly reads the oxygen rifle rifle head actual feedback of the last scanning period of storing in the DB data block in the PLC controller.Step 603 is judged the smallest limit place value whether current oxygen rifle rifle head position is set, and if not, then returns step 601; If then step 605 forbids that the oxygen rifle is descending, oxygen rifle traffic direction is forced upwards to return step 601.Simultaneously, in case in steps 604, mechanical smallest limit position triggering signal takes place, and then step 605 forbids that the oxygen rifle is descending, and oxygen rifle traffic direction is forced upwards to return step 601.
(6) steel wire rope tension detection controlling alarm: after frequency transformer brings into operation; at equal frequency transformer of each scanning period actual steel wire rope tension and the set(ting)value that PLC delivers to compared; in case find difference greater than 200% set(ting)value, perhaps, trigger shutdown procedure immediately less than 50% set(ting)value.Normally oxygen rifle machinery is stuck greater than 200% when difference, must cause wire cable rupture if continue operation; Less than 50%, a kind of situation is that wireline fracture occurred to the both sides imbalance for difference, and another situation is an oxygen rifle offset track and cause the rifle head and run into the other machinery of track when descending, and normally nitrogen seals.Under the both of these case, all should trigger shutdown procedure immediately, frequency transformer is notified the PLC controller immediately then, given notice by the PLC controller and manually carry out processing signals, and fault is not when obtaining artificial affirmation, and frequency transformer is in always forbids running status.Fig. 9 is a steel wire rope tension detection controlling alarm process flow diagram flow chart of the present invention, beginning step 701, the frequency transformer operation, step 702, PLC detects steel wire rope tension in each scanning period, step 703, whether frequency transformer is steel wire rope tension value and wireline nominal value relatively, less than 50% of nominal value, perhaps greater than 200% of nominal value? if not, then step 701 continues the frequency transformer operation; If then step 704 enters shutdown procedure, continue step 705, notice is manually handled wireline, and manual handling is meant that mode such as show notifies the surfaceman to handle on the HMI man-machine interface.
The security logic control method that technique scheme has adopted that PLC and frequency transformer cooperate is soft, hardware combines, fully independently the frequency transformer of opening and cutting out band-type brake logic, safety of band-type brake circuit control loop, safety removes enable logic, adopts position model to calculate real-time guard, adopts oxygen rifle smallest limit position hardwire to add soft logic protection.Through test, can reach following technical parameter: speed positioning error: 20mm.The oxygen rifle slips down during startup:＜20mm.Oxygen rifle carry:＜20mm when stopping.
It should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (12)
1. converter oxygen lance anti-fall device, comprise frequency transformer, oxygen rifle motor and band-type brake, it is characterized in that: also comprise programmable logic controller PLC, described PLC be used to control described frequency transformer startup, stop, speed is given, the open and close of band-type brake, frequency transformer is removed and is enabled, and described frequency transformer is installed communication board, by this communication board and described plc communication.
2. converter oxygen lance anti-fall device according to claim 1 is characterized in that: the master loop switch of described frequency transformer has first pilot contactor, and this first pilot contactor is connected on the described band-type brake contactor control loop.
3. converter oxygen lance anti-fall device according to claim 2, it is characterized in that: the break-make of the band-type brake control loop of described frequency transformer is controlled to be intermediate relay, the coil of described intermediate relay is connected on the switchboard of described frequency transformer, the secondary contact of described intermediate relay are connected on the control loop of described band-type brake, when described intermediate relay coil gets when electric the secondary contact closure of described intermediate relay.
4. converter oxygen gun stroke apparatus according to claim 3 is characterized in that: the contactor of described band-type brake has second secondary contact, and these second secondary contact enter on the described Frequency Converter Control plate.
5. converter oxygen gun stroke apparatus according to claim 3 is characterized in that: the smallest limit position guard signal hardwire of described oxygen rifle inserts described frequency transformer, and described smallest limit position guard signal is forbidden the interlocking condition that oxygen rifle motor is descending as frequency transformer.
6. converter oxygen lance anti-fall device according to claim 5, it is characterized in that: install near switch on the on-the-spot hydraulic push rod connecting rod side at described band-type brake, should connect described Frequency Converter Control loop by signal wire near switch signal, remove the interlocking condition that enables as described frequency transformer.
7. the control method of the described converter oxygen lance anti-fall device of claim 6 is characterized in that, its oxygen rifle position monitoring control process may further comprise the steps:
A-1: frequency transformer brings into operation, and described PLC is by its interrupt control routine, with the frequency transformer travelling speed of certain scanning period scanning;
A-2: in each scanning period, calculate the change in location value and the oxygen rifle calculated location value of oxygen rifle, wherein:
The change in location value of oxygen rifle=current frequency transformer travelling speed multiply by the scanning period duration,
The oxygen rifle was remembered the change in location value of oxygen lance position+oxygen rifle calculated location value=last time; In the formula, remembering oxygen lance position last time is the oxygen rifle calculated location value of calculating in the last scanning period;
A-3: the oxygen rifle rifle height value of the encoder actual feedback of more current oxygen rifle calculated location value and frequency transformer; when the difference between the two is less than or equal to the position difference upper limit parameter of setting; system can normally move by processing condition always; when this difference surpasses this position difference upper limit parameter; promptly be considered as the oxygen rifle and fall rifle, trigger the urgency of frequency transformer immediately and shut down logic.
8. the control method of converter oxygen lance anti-fall device according to claim 7; it is characterized in that: further comprising steel wire rope tension detection controlling alarm process; may further comprise the steps: described PLC detects the tension force of oxygen rifle motor wireline in service in real time in each scanning period; when this tension force during greater than the tension force upper limit parameter of setting or less than the tension force lower limit parameter set; described steel wire rope tension detection unit triggers the frequency transformer shutdown procedure immediately, and sends the warning stopping signal.
9. the control method of converter oxygen lance anti-fall device according to claim 8 is characterized in that its open and close band-type brake control may further comprise the steps:
B-1: described PLC sends normal enabled instruction, frequency transformer enables, frequency transformer judges whether outward current reaches the setting current parameters of motor rated current, be, and when frequency transformer does not detect the wireline warning, on the Frequency Converter Control loop open band-type brake switch intermediate relay get electric, described band-type brake control loop intermediate relay main switch closure, band-type brake is opened;
B-2: when oxygen rifle operation arrived target bit, described PLC sent out stop signal to frequency transformer, and frequency transformer is motor actual feedback speed and given rotating speed parameter relatively, when motor actual feedback speed during less than the given rotating speed parameter, carried out the pass band-type brake;
B-3: receive wireline when described PLC or frequency transformer and report to the police, suddenly stop, the smallest limit position protect expand, during any one signal in the frequency transformer inner/outer fault alarm, frequency transformer closes band-type brake immediately.
10. the control method of converter oxygen lance anti-fall device according to claim 9; it is characterized in that frequency transformer remove enable control may further comprise the steps: described frequency transformer is received the conventional halt command that PLC sends; judge whether the motor actual speed signal is " 0 " signal; be; and receive the described pilot contactor contact cut-off signal in the band-type brake control loop; and described during near switch closure signals, frequency transformer removes and enables.
11. the control method of converter oxygen lance anti-fall device according to claim 10, it is characterized in that the oxygen rifle descending forbid control may further comprise the steps: when frequency transformer brings into operation, read the oxygen lance position of current encoder feedback in each scanning period, the oxygen lance position of more described current encoder feedback and the oxygen lance position smallest limit parameter value of setting, if the oxygen lance position of described current encoder feedback is during less than described smallest limit parameter value, descending forbidding of Frequency Converter Control oxygen rifle; And/or when described frequency transformer was received described smallest limit guard signal, frequency transformer controlled immediately that the oxygen rifle is descending to be forbidden.
12. converter oxygen lance anti-fall device according to claim 1 is characterized in that: the control loop of described band-type brake is an individual electrical loop.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826792A (en) * | 2010-03-04 | 2010-09-08 | 江阴盛辉科技有限公司 | Method for avoiding damage of frequency converter in stopping and restarting process |
| CN102787231A (en) * | 2011-05-17 | 2012-11-21 | 上海宝信软件股份有限公司 | Emergency stopping method and emergency stopping apparatus for vertical looper of continuous annealing unit |
| CN103361463A (en) * | 2012-03-31 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Position control system and method for oxygen lance in converter |
| CN103981329A (en) * | 2014-04-28 | 2014-08-13 | 山东科技大学 | Automatic locking system for preventing oxygen lance from falling down |
| CN104120211A (en) * | 2014-07-01 | 2014-10-29 | 中冶南方工程技术有限公司 | Oxygen lance start control method and device |
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| CN105420442A (en) * | 2014-09-19 | 2016-03-23 | 鞍钢股份有限公司 | Lance-stopping protecting method for top blow oxygen lance of converter |
| CN105506216A (en) * | 2015-12-17 | 2016-04-20 | 大连华冶联自动化有限公司 | Device and method for ensuring safe operation of oxygen lance direct current emergency oxygen lance lifting |
| CN105907918A (en) * | 2016-07-05 | 2016-08-31 | 中冶赛迪电气技术有限公司 | Control system and method for improving operation safety of converter oxygen lance |
| CN107641680A (en) * | 2017-10-27 | 2018-01-30 | 江苏永钢集团有限公司 | Converter body fascinates delay contracting control method |
| CN110684879A (en) * | 2019-10-29 | 2020-01-14 | 首钢京唐钢铁联合有限责任公司 | Method and device for preventing oxygen lance from falling |
| CN111100966A (en) * | 2019-12-12 | 2020-05-05 | 首钢京唐钢铁联合有限责任公司 | Converter sublance lifting control system and method |
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| CN113667795A (en) * | 2021-07-06 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Control method and device for transverse movement locking of oxygen lance of steel converter and industrial control equipment |
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2008
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| CN101826792A (en) * | 2010-03-04 | 2010-09-08 | 江阴盛辉科技有限公司 | Method for avoiding damage of frequency converter in stopping and restarting process |
| CN101826792B (en) * | 2010-03-04 | 2012-04-11 | 江阴盛辉科技有限公司 | Method for avoiding damage of frequency converter in stopping and restarting process |
| CN102787231A (en) * | 2011-05-17 | 2012-11-21 | 上海宝信软件股份有限公司 | Emergency stopping method and emergency stopping apparatus for vertical looper of continuous annealing unit |
| CN102787231B (en) * | 2011-05-17 | 2014-09-03 | 上海宝信软件股份有限公司 | Emergency stopping method and emergency stopping apparatus for vertical looper of continuous annealing unit |
| CN103361463A (en) * | 2012-03-31 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Position control system and method for oxygen lance in converter |
| CN103361463B (en) * | 2012-03-31 | 2015-11-18 | 上海梅山钢铁股份有限公司 | A kind of oxygen lance in converter position control system and method |
| CN103981329A (en) * | 2014-04-28 | 2014-08-13 | 山东科技大学 | Automatic locking system for preventing oxygen lance from falling down |
| CN103981329B (en) * | 2014-04-28 | 2016-04-20 | 山东科技大学 | Oxygen rifle falls automatic locking system |
| CN104120211A (en) * | 2014-07-01 | 2014-10-29 | 中冶南方工程技术有限公司 | Oxygen lance start control method and device |
| CN104120211B (en) * | 2014-07-01 | 2016-03-02 | 中冶南方工程技术有限公司 | A kind of oxygen rifle starts control method and device |
| CN105420442A (en) * | 2014-09-19 | 2016-03-23 | 鞍钢股份有限公司 | Lance-stopping protecting method for top blow oxygen lance of converter |
| CN104485853A (en) * | 2014-12-19 | 2015-04-01 | 清能德创电气技术（北京）有限公司 | Servo driver with motor brake monitor and abnormal brake detection method thereof |
| CN105506216A (en) * | 2015-12-17 | 2016-04-20 | 大连华冶联自动化有限公司 | Device and method for ensuring safe operation of oxygen lance direct current emergency oxygen lance lifting |
| CN105506216B (en) * | 2015-12-17 | 2017-08-25 | 大连华冶联自动化有限公司 | It is a kind of to ensure the device and method that oxygen rifle direct current accident proposes rifle safe operation |
| CN105907918A (en) * | 2016-07-05 | 2016-08-31 | 中冶赛迪电气技术有限公司 | Control system and method for improving operation safety of converter oxygen lance |
| CN107641680A (en) * | 2017-10-27 | 2018-01-30 | 江苏永钢集团有限公司 | Converter body fascinates delay contracting control method |
| CN110684879A (en) * | 2019-10-29 | 2020-01-14 | 首钢京唐钢铁联合有限责任公司 | Method and device for preventing oxygen lance from falling |
| CN111100966A (en) * | 2019-12-12 | 2020-05-05 | 首钢京唐钢铁联合有限责任公司 | Converter sublance lifting control system and method |
| CN111100966B (en) * | 2019-12-12 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Converter sublance lifting control system and method |
| CN111334641A (en) * | 2020-03-08 | 2020-06-26 | 广东韶钢松山股份有限公司 | Device and method for preventing converter oxygen lance from rushing to top |
| CN113667795A (en) * | 2021-07-06 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Control method and device for transverse movement locking of oxygen lance of steel converter and industrial control equipment |
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