CN1224568C - Directly stopping elevator system and its control method - Google Patents
Directly stopping elevator system and its control method Download PDFInfo
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- CN1224568C CN1224568C CN 02110769 CN02110769A CN1224568C CN 1224568 C CN1224568 C CN 1224568C CN 02110769 CN02110769 CN 02110769 CN 02110769 A CN02110769 A CN 02110769A CN 1224568 C CN1224568 C CN 1224568C
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- elevator
- frequency converter
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- leveling switch
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Abstract
The present invention relates to an elevator system which can directly park and a control method thereof. The elevator system comprises a programmable logic controller (namely PLC), a frequency converter, an electric motor, an encoder, a cage, a hoist way and various switching signals, wherein the electric motor controlled by the frequency converter can drive the elevator cage to vertical move, and the PLC detects signals of the hoist way, stations and the cage so as to control and manage the elevator; the PLC and an input-output line of the frequency converter control the frequency converter to start and stop, so the frequency converter can obtain accurate distance remaining information and can correct deceleration curves of the elevator in real time, and the actual deceleration distance of the elevator is consistent with the remaining distance. The elevator starts to directly decelerate from a deceleration point to zero and can accurately level, and the running efficiency and the comfortable sense of the elevator are increased.
Description
Technical field
The present invention relates to elevator device, relate in particular to a kind of elevator device and control method that can realize directly stop.
Background technology
In the present existing elevator, be to adopt programmable logic controller (PLC) (being designated hereinafter simply as PLC) and frequency converter as control system.This system passes through each status detection on hoistway and the car is realized control, the management of elevator by PLC, and controls the start and stop of frequency converters according to these detection signals.And frequency converter produces velocity curve, and driving motor moves up and down lift car predetermined running curve.
In this system, PLC can carry out such as elevator safety monitoring, hoistway signal detection, to car call, floor call signal detection, maintenance, the affirmation of running state automatically.And, by frequency converter being started or stoped, and make frequency converter obtain the service direction and the object run speed of electrical motor with frequency converter bonded assembly input/output signal with after the various signal conditioning.For example elevator stops at the 1st building, have command signal need make elevator run to the 3rd buildings this moment, then at first judge by PLC, if system is normal, when elevator unclamps band-type brake and provides elevator and make progress run signal and to make frequency converter object run speed be High-Speed Automatic operation, lift car is operation upwards, when elevator car arrives when the 3rd buildings also have, PLC sends restriction signal notice frequency converter and elevator is slowed down by predetermined curve and finally stops.
Here management program mainly is to be finished by PLC.This is that when this starts, slows down or stop only can not knowing elevator by itself because the input and output of frequency converter are counted to be lacked.That is to say that frequency converter inside lacks the management program of elevator, the deceleration point of elevator operation is sent by PLC, but velocity curve must be realized by frequency converter.Because influence of various factors such as PLC cycle of run, the output time-delay of PLC contact, frequency converter input time delay, when frequency converter obtains restriction signal that PLC sends, elevator is from real surplus leading or postponement apart from possibility of target floor level position, be that Distance Remaining is indefinite, but frequency converter is to slow down by the specific run curve, and promptly deceleration distance is relatively-stationary.If therefore by directly decelerating to zero-speed at a high speed and stopping, then elevator is difficult to accomplish accurate flat bed to elevator from deceleration point.
Based on above reason, the apparatus for controlling elevator of being made up of PLC and frequency converter in the past is not to adopt the method for directly stopping, but after frequency converter is received restriction signal, make elevator from the very low creeper speed of high deceleration to earlier, elevator does not also arrive level position when finishing as deceleration, just keeps this creeper speed, and elevator continues ahead running, up to running to level position, elevator stops.
As shown in Figure 4, it is speed and acceleration operation diagram of curves that conventional non-direct stop elevator adopts.Among Fig. 4, PLC sends restriction signal constantly and is received by frequency converter at T1, elevator reduces speed now, owing to the reason that illustrates previously, frequency converter obtains restriction signal and may in advance or postpone, be that elevator Distance Remaining S (i.e. dash area area among the figure) is for indefinite, but owing to do not comprise management program in the frequency converter, it does not also know this situation, can only slow down according to predetermined accelerating curve,, deceleration distance is fixed if therefore adopt the method that directly decelerates to zero-speed, then inconsistent with the real surplus distance, flat bed is inaccurate.In order to make Elevator landing accurate, as shown in Figure 4, after frequency converter is received restriction signal, make elevator decelerate to a lower creeper speed V1 from high speed V0 earlier, deceleration distance is S0, keeps this creeper speed then, elevator is creeped apart from being S1, when elevator runs to level position (magnetic isolation plate 9 all moves upper and lower leveling switch 7,8), elevator decelerates to zero and stop by creeper speed V1, and the elevator stopping distance is S2.Hence one can see that, the deceleration distance S=S0+S1+S2 that elevator is total, wherein, S0 and S2 are owing to the setting of accelerating curve is fixed, and the time that creeper speed is kept is variable, promptly from T2 play constantly T3 that upper and lower leveling switch 7,8 all moves constantly till, therefore creeping apart from S1 is that level position according to reality changes, finally make total reduction apart from S and real surplus apart from consistent, realize accurate flat bed.
But but elevator is produced the other problem thus.Because the situation that the T3 in Fig. 4 makes upper and lower leveling switch 7,8 all move constantly, for making leveling accuracy and making the band-type brake acceleration/accel not excessive, stopping distance S2 can not be too big, and generally between 5-8mm, so the setting of creeper speed V1 can not be too high.In the time of can elevator being creeped because of the low speed feature of motor is bad so certain vibration be arranged, cause the uncomfortable sensation of passenger.In addition, cause the measurement error that detects car position because of the PLC performance period, make that the real surplus distance was littler than the deceleration distance of needs when PLC sent deceleration point, then elevator may exceed level position and reverse flat bed, therefore must force PLC to send deceleration point in advance, the frequency converter driving motor is slowed down in advance and be unlikely to make the elevator operation excessive, can make the distance of creeping elongated so again, crawl time increases, and has reduced the elevator operating efficiency.
Summary of the invention
The object of the present invention is to provide and a kind ofly eliminate creeper speed in the system, make elevator can directly decelerate to that zero-speed stops, and accurate flat bed, the system and the control method of the operating efficiency of raising elevator and the realization direct stopping of elevator of traveling comfort from deceleration point.
In order to achieve the above object, the present invention is achieved in that
The present invention at first provides following system, and this system comprises programmable logic controller (PLC), frequency converter, electrical motor, coder, car, hoistway, goes up leveling switch, leveling switch, magnetic isolation plate and connect one group of input/output signal in the frequency converter of programmable logic controller (PLC) down; The lift car sidewall is equipped with leveling switch and following leveling switch, the fixing magnetic isolation plate in each floor position place on the elevator hoistways sidewall, magnetic isolation plate and last leveling switch, leveling switch is related down, and above-mentioned all signals are sent into the programmable logic controller (PLC) of elevator together in company with safety signal, car call and each landing button signal of elevator; Logical signal after described programmable logic controller (PLC) detects and handles is by the input/output signal input converter, frequency converter is started or stoped, the impulse singla of coder is then sent in programmable logic controller (PLC) and the frequency converter respectively, make programmable logic controller (PLC) can monitor the absolute location of lift car, the drive part frequency converter of elevator and coder constitute the speed closed loop system simultaneously, by the frequency converter driving motor, make direct stopping of elevator and accurate flat bed.
The present invention also provides a kind of control method that realizes direct stopping of elevator, at first magnetic isolation plate (9) make leveling switch (7) or down leveling switch (8) action moment elevator be fixing and known apart from the Distance Remaining of level position, and this Distance Remaining apart from level position is input in the frequency converter (2); Secondly when magnetic isolation plate (9) make leveling switch (7) or down during leveling switch (8) action programmable logic controller (PLC) (1) detect and send signal and makes it change accelerating curve for frequency converter (2), and make by described go up leveling switch (7) or when being zero when leveling switch (8) moves down to elevator speed the dash area area that velocity curve comprised identical with described elevator apart from the Distance Remaining of level position.
The present invention also provides the control method of another kind of realization direct stopping of elevator, at first the elevator floor position signal is written to simultaneously programmable controller (1) and frequency converter (2); Secondly elevator is in operational process, frequency converter (2) by coder (4) calculate in real time lift car (5) in the residing position of hoistway (6) and elevator apart from the Distance Remaining of level position, frequency converter (2) is according to the Distance Remaining of described elevator apart from level position, revise the accelerating curve of elevator, make deceleration distance identical apart from the Distance Remaining of level position with described elevator.
The present invention carries out logical combination by the programmable logic controller (PLC) information of receiving in the elevator device, under the situation that the input and output that do not increase frequency converter are counted out, increase its quantity of information that can obtain, make frequency converter can obtain floor position information accurately, revise running velocity and accelerating curve, the direct stop of realization elevator and the accurate flat bed of elevator in real time by this information.
Description of drawings
Can better understand technology contents of the present invention and purpose effect with reference to following accompanying drawing:
Fig. 1 is the scheme drawing of elevator device of the present invention and control method thereof;
Fig. 2 realizes the elevator speed and the acceleration operation diagram of curves of directly stop with single-point Distance Remaining modification method for the present invention;
Fig. 3 realizes the elevator speed and the acceleration operation diagram of curves of directly stop with omnidistance Distance Remaining modification method for the present invention;
Fig. 4 is speed and the acceleration operation diagram of curves that conventional non-direct stop elevator adopts.
Element title and symbol contrast among the figure:
1 programmable logic controller (PLC)
2 frequency converters
3 electrical motors
4 coders
5 cars
6 hoistways
Leveling switch on 7
8 times leveling switch
9 magnetic isolation plates
10 input/output signals
11 safety inspection signals
12 car calls and landing button signal
The specific embodiment
Elevator device and control method thereof that the present invention as shown in Figure 1 adopts, this elevator device comprises lift car 5 and is installed in the last leveling switch 7 and the following leveling switch 8 of lift car 5 sidewalls, elevator hoistways 6 and be installed in the magnetic isolation plate 9 at each floor position place on hoistway 6 sidewalls, magnetic isolation plate 9 is related with last leveling switch 7 and following leveling switch 8, above-mentioned all signals are in company with other safety signals 11 of elevator, car call and each landing button signal 12 etc. are sent into the programmable logic controller (PLC) that manages and control of elevator together, send and receive input/output signal 10 by signal wire (SW), frequency converter 2 can obtain the logical signal after PLC detects and handles, such as elevator automatically, overhaul or write running statees such as layer, and elevator service direction and the place ahead stop stop etc., and frequency converter 2 is started or stoped, the impulse singla of coder 4 is sent into respectively in PLC1 and the frequency converter 2, the absolute location of lift car 5 can be monitored by PLC1, the drive part frequency converter 2 of elevator constitutes the speed closed loop system with rotary encoder 4 simultaneously, frequency converter 2 driving motors 3 make lift car 5 according to predetermined speed and accelerating curve operation.
Directly stopping is exactly that elevator is directly stopped by directly decelerating to zero-speed at a high speed, and accurate flat bed, and it has cancelled the section of creeping, and elevator operating efficiency and traveling comfort all are greatly increased.Fig. 2 realizes the elevator speed and the acceleration operation diagram of curves of directly stop with single-point Distance Remaining modification method for the present invention.As previously mentioned, PLC in the past adds elevator device that frequency converter forms, and can not to adopt the reason of direct stop be that frequency converter can not obtain accurately the Distance Remaining information apart from level position, therefore can't regulate accelerating curve, and the measure that can only take to increase the section of creeping solves the problem of accurate flat bed.If can make frequency converter obtain the accurate information apart from the Distance Remaining of level position of elevator from level position, adjust accelerating curve then, make deceleration distance consistent with Distance Remaining apart from level position, can realize direct stop.Consider that working as magnetic isolation plate 9 makes a moment of going up leveling switch 7 or following leveling switch 8 actions, elevator is accurate and definite from the distance L 0 of level position, can revise the Distance Remaining apart from level position of elevator with this signal.With reference to Fig. 2, in the process of deceleration of elevator, when magnetic isolation plate 9 make leveling switch 7 when up () or down during leveling switch 8 when descending () action when T2 (among Fig. 3) send signal and make it change accelerating curve for frequency converter 2, and to make by T2 be L0 to the dash area area that velocity curve comprised of T3, and elevator is realized directly stopping and accurate flat bed.In this process, because the restriction signal that PLC sends may shift to an earlier date or postpone, the accelerating curve shape of various situations can be different, various situations are analyzed, and be that prerequisite realizes directly stopping to guarantee that saltus step does not appear in accelerating curve.
The present invention as shown in Figure 3 realizes the elevator speed and the acceleration operation diagram of curves of directly stop with omnidistance Distance Remaining modification method.With reference to Fig. 3, PLC sends restriction signal constantly and is just received by frequency converter at T1, elevator reduces speed now, if this moment, frequency converter was known the Distance Remaining of elevator from the actual distance level position of level position, then can calculate required maximum deceleration of elevator and deceleration/decel rate of change according to this Distance Remaining apart from level position, and between whole deceleration period, constantly revise the accelerating curve of elevator, make deceleration distance consistent, realize directly stopping and accurate flat bed with the Distance Remaining of actual distance level position.Owing to be that whole process is revised at any time, accelerating curve saltus step can not occur in the makeover process of elevator accelerating curve, and traveling comfort is good, has increased the accuracy of flat bed simultaneously yet.Key of the present invention is exactly how to make frequency converter obtain accurately Distance Remaining apart from level position during the elevator whole service.The floor position signal is written to frequency converter inside, the restriction signal that sends by PLC obtains stopping the floor signal simultaneously, and when an action is arranged in last leveling switch 7 and following leveling switch 8 and two floor position of correction when all moving signals, frequency converter can complete monitoring apart from the Distance Remaining of level position, and change accelerating curve in the operational process according to present speed and acceleration/accel at any time.In order to realize the present invention, must increase the quantity of information between frequency converter and the PLC, frequency converter needs to obtain to write layer from PLC, maintenance, multiple elevator operation type signal such as automatically, the deceleration of elevator signal, restriction signal is forced at the end station, a leveling switch (going up leveling switch 7 or following leveling switch 8) actuating signal, two leveling switch (going up leveling switch 7 and following leveling switch 8) are actuating signal all, elevator service direction signal, multiple operating state signals such as frequency converter enable signal, frequency converter transmits motor zero-speed signal to PLC simultaneously, motor low speed signals etc. are made safety for PLC and are judged use.The present invention is under the prerequisite that does not influence elevator safety, by suitable logical combination, only used 2 output points of frequency converter, 4 entrance points to finish the transmission of above multiple signal, this is the input and output number of spots that nearly all universal or special frequency converter can both provide.After finishing above signal transmission, the elevator floor position signal can be write in the frequency converter, realize the direct stop of the Distance Remaining correction of whole range distance level position.The result shows that elevator can directly stop, and has improved operating efficiency, and leveling accuracy and accelerating curve are level and smooth, does not have uncomfortable vibration.
Claims (3)
1, a kind of system that realizes direct stopping of elevator, this system comprise programmable logic controller (PLC) (1), frequency converter (2), electrical motor (3), coder (4), car (5), hoistway (6), go up leveling switch (7), leveling switch (8), magnetic isolation plate (9) and connect one group of input/output signal (10) in the frequency converter (2) of programmable logic controller (PLC) (1) down; Lift car (5) sidewall is equipped with leveling switch (7) and following leveling switch (8), the fixing magnetic isolation plate (9) in each floor position place on elevator hoistways (6) sidewall, magnetic isolation plate (9) and last leveling switch (7), leveling switch (8) is related down, and above-mentioned all signals are sent into the programmable logic controller (PLC) (1) of elevator together in company with safety signal (11), car (5) instruction and each landing button signal (12) of elevator; It is characterized in that: the logical signal after described programmable logic controller (PLC) (1) detects and handles is by input/output signal (10) input converter (2), frequency converter (2) is started or stoped, the impulse singla of coder (4) is then sent into respectively in programmable logic controller (PLC) (1) and the frequency converter (2), make programmable logic controller (PLC) (1) can monitor the absolute location of lift car (5), the drive part frequency converter (2) of elevator and rotary encoder (4) constitute the speed closed loop system simultaneously, by frequency converter (2) driving motor (3), make direct stopping of elevator and accurate flat bed.
2, a kind of control method that adopts the system of realization direct stopping of elevator as claimed in claim 1 is characterized in that:
At first magnetic isolation plate (9) make leveling switch (7) or down leveling switch (8) action moment elevator be fixing and known apart from the Distance Remaining of level position, and this Distance Remaining apart from level position is input in the frequency converter (2);
Secondly programmable logic controller (PLC) (1) detects and sends signal and makes its change accelerating curve to frequency converter (2) when magnetic isolation plate (9) makes leveling switch (7) or leveling switch (8) moves down, makes deceleration distance identical apart from the Distance Remaining of level position with described elevator.
3, a kind of control method that adopts the system of realization direct stopping of elevator as claimed in claim 1 is characterized in that:
At first the elevator floor position signal is written to simultaneously programmable controller (1) and frequency converter (2);
Secondly elevator is in operational process, frequency converter (2) by coder (4) calculate in real time lift car (5) in the residing position of hoistway (6) and elevator apart from the Distance Remaining of level position, frequency converter (2) is according to the Distance Remaining of described elevator apart from level position, revise the accelerating curve of elevator, make deceleration distance identical apart from the Distance Remaining of level position with described elevator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110769 CN1224568C (en) | 2002-02-05 | 2002-02-05 | Directly stopping elevator system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110769 CN1224568C (en) | 2002-02-05 | 2002-02-05 | Directly stopping elevator system and its control method |
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| Publication Number | Publication Date |
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| CN1436713A CN1436713A (en) | 2003-08-20 |
| CN1224568C true CN1224568C (en) | 2005-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02110769 Expired - Fee Related CN1224568C (en) | 2002-02-05 | 2002-02-05 | Directly stopping elevator system and its control method |
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| CN (1) | CN1224568C (en) |
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| CN102849614A (en) * | 2011-06-28 | 2013-01-02 | 苏州经贸职业技术学院 | Four-story elevator control system based on PLC |
| CN102502367A (en) * | 2011-10-31 | 2012-06-20 | 广州日滨科技发展有限公司 | Method for controlling stopping of elevator and control system |
| CN103318735B (en) * | 2013-06-30 | 2015-06-17 | 东南电梯股份有限公司 | Horizontally movable elevator car assembly |
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| CN104340785B (en) * | 2014-10-16 | 2016-05-11 | 怡达快速电梯有限公司 | Elevator speed control method |
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| CN105084141A (en) * | 2015-09-18 | 2015-11-25 | 广州日滨科技发展有限公司 | Control method capable of achieving direct stopping of elevator |
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| JP6774384B2 (en) * | 2017-06-15 | 2020-10-21 | 株式会社日立製作所 | Elevator control device and elevator control method |
| CN107539857A (en) * | 2017-08-30 | 2018-01-05 | 顺德职业技术学院 | A kind of practice teaching elevator of bistable state sensing |
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| CN109969881A (en) * | 2019-03-12 | 2019-07-05 | 武汉合康电驱动技术有限公司 | Control the method and apparatus of construction hoist stopping distance |
| CN111689318B (en) * | 2020-05-18 | 2022-09-09 | 北京索德电气工业有限公司 | Elevator smooth leveling control method |
| CN114132810B (en) * | 2020-09-04 | 2023-09-29 | 上海三菱电梯有限公司 | Method and system for monitoring elevator running state and elevator part state |
| CN113086793B (en) * | 2021-03-30 | 2022-05-20 | 北京猎户星空科技有限公司 | Floor determination method and device |
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2002
- 2002-02-05 CN CN 02110769 patent/CN1224568C/en not_active Expired - Fee Related
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| CN1436713A (en) | 2003-08-20 |
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