CN102372222A - Reverse, over-speed and stall protection safety circuit of escalator and moving walkway - Google Patents
Reverse, over-speed and stall protection safety circuit of escalator and moving walkway Download PDFInfo
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- CN102372222A CN102372222A CN2010102652336A CN201010265233A CN102372222A CN 102372222 A CN102372222 A CN 102372222A CN 2010102652336 A CN2010102652336 A CN 2010102652336A CN 201010265233 A CN201010265233 A CN 201010265233A CN 102372222 A CN102372222 A CN 102372222A
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Abstract
The invention discloses a reverse, over-speed and stall protection safety circuit of an escalator and a moving walkway. The reverse, over-speed and stall protection safety circuit comprises an input control module, a control processing module, and an output execution module, wherein the input control module is used for detecting the running state of the escalator and the moving walkway and inputting a detected signal to the control processing module; the control processing module consists of a programmable logic device, and is used for determining whether reverse, over-speed and stall happen according to a running state signal of the escalator and the moving walkway inputted by the input control module, and for controlling the output execution module to act when reverse, over-speed and stall happen; and a normally-open contact of the output execution module is serially connected with a safety control circuit of the escalator and the moving walkway, and the normally-open contact is switched off when reverse, over-speed and/or stall happen so as to achieve the safety protection. The safety circuit provided by the invention can achieve non-operating reverse protection, over-speed and stall protection.
Description
Technical field
The present invention relates to escalator and moving sidewalk control field, particularly relate to reverse, hypervelocity and the stall protection vital circuit of a kind of escalator and moving sidewalk.
Background technology
In those early years, the electric safety device of escalator and moving sidewalk is to be realized by fairly simple circuit, and is classified as vital circuit to it.Now, in the control circuit of electric safety device, used more complicated electronic elements to realize needed function logic, even some must use PES (programmable electronic system) to realize.GB16899 " manufacturing of escalator and moving sidewalk and installation safety standard " has had been noted that and in vital circuit, has used electronic component, and provided the regulation of hardware aspect.
At present, GB16899 has expanded its scope to the control circuit of electric safety device, allows that PES (comprising software) realizes.But must meet the standard of PESSRAL (being applied in the programmable electronic system in the elevator safety) by the electric safety device that software participate in to be realized, must verify in strict accordance with the flow process of PESSRAL.No matter and the flow process of PESSRAL is design or verifies it all is quite complicated.
Requirement according to 14.2.2.4.1 among the GB16899 (e); Control setup should be out of service automatically in hypervelocity and the non-operating reversed following escalator of service direction; And stipulate further that at 14.2.2.4.2 the open circuited action of the switch under this situation should be accomplished through safety contact or vital circuit.
At present; The non-operating reversed protection of existing escalator and moving sidewalk does not realize through safety contact or vital circuit; Do not meet the requirement of GB16899, and, also do not have the failure-free scheme to realize non-operating reversed protection at present with the method for safety contact through the technological analysis investigation; Therefore need a kind of method of invention to realize non-operating reversed protection, to satisfy the requirement of GB16899 through vital circuit.
In addition, for the overspeed protection of escalator and moving sidewalk, major part realizes through the safety device of mechanical system that all cost can exceed much comparatively speaking at present.
Summary of the invention
The technical matters that the present invention will solve provides reverse, hypervelocity and the stall protection vital circuit of a kind of escalator and moving sidewalk, adopts vital circuit to realize non-operating reversed protection, and can realize hypervelocity and stall protection.
For solving the problems of the technologies described above, the reverse of escalator of the present invention and moving sidewalk, hypervelocity and stall protection vital circuit comprise:
One input control module is used to detect the running state of escalator and moving sidewalk, and detected signal is inputed to the control and treatment module; The signal that said input control module detects comprises the signal of escalator and moving sidewalk real-world operation speed and real-world operation direction; The signal of the operating instruction of indication escalator and moving sidewalk running state makes said operating instruction input all confirm that according to redundant fashion promptly certain operating instruction all can be confirmed by the level logic that other incoming signal is formed mutually; Indication escalator and moving sidewalk are in the signal of specified running velocity state, perhaps are in the command signal of certain running velocity state of confirming;
One control and treatment module; The employing PLD constitutes, and according to the escalator of input control module input and the operating state signal of moving sidewalk, judges whether to occur reverse, hypervelocity and stall; When reverse, hypervelocity and/or stall occurring, the action of control output execution module;
One output execution module; Be connected with the control and treatment module; Its open contact is connected in the safety control loop of escalator and moving sidewalk, and is under the normal operating condition at escalator and moving sidewalk, and its open contact is closed; Its open contact breaks off when reverse, hypervelocity and/or stall occurring, realizes reverse, hypervelocity and/or stall safety guard-safeguard.
The present invention adopts PLD (CPLD, FPGA, GAL circuit or other dynamically configured hardware circuit devcie) to realize reverse, hypervelocity and the stall protection vital circuit of escalator and moving sidewalk.The control circuit of PLD has stronger antijamming capability, can satisfy the stability and the reliability requirement of hardware circuit, and its powerful logic function can realize complicated control and treatment function simultaneously again.Said PLD is CPLD (but complicacy program logic device), FPGA (field programmable gate array), GAL (GAL) circuit or other dynamically configured hardware circuit devcie; Do not comprise any microprocessor of realizing control by software program.
The reverse of escalator of the present invention and moving sidewalk, hypervelocity and stall protection vital circuit are in the requirement that has all realized the GB16899 defined aspect reversal protection, hypervelocity and the stall protection fully.
The conventional security circuit is only accomplished function by simple electronic device, and is relatively reliable, and design and checking are simple relatively; But the circuit function by simple electronic devices and components structure can not be tackled complicated safety guard-safeguard usually, judges and the hypervelocity arbitration functions for realizing that escalator reverses, and implements difficulty relatively.
The present invention uses reverse, hypervelocity and the stall protection vital circuit that PLD is realized escalator and moving sidewalk, has all advantages of the common vital circuit that contains electronic component, simultaneously, meets the demands fully on the design function.The vital circuit of using PLD can realize the defencive function more complicated, that control accuracy is higher; Has powerful self-monitoring function; Through incoming signal is disposed various Filtering Processing flexibly, can improve the accuracy of incoming signal; The vital circuit cost of using PLD is also very economical, and design and checking flow process are also simple relatively.Therefore PLD is applied to the vital circuit of escalator and moving sidewalk, very big meaning is arranged for the development of escalator and moving sidewalk safety device.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:
Fig. 1 is reverse of the present invention, hypervelocity and stall protection vital circuit one embodiment system chart;
Fig. 2 is the scheme drawing that speed and rotation direction detect;
Fig. 3 is the inner structure block diagram of first PLD and second PLD, one embodiment among Fig. 1;
Fig. 4 is the transition diagram of the running state of the escalator realized by state machine in first PLD and second PLD among Fig. 1 or moving sidewalk;
Fig. 5 is that first, second surveys procedure chart with the 3rd PLD to the power-on self-test of safety relay among Fig. 1.
The specific embodiment
Be that example describes content of the present invention with CPLD among the embodiment below, so that the useful technique effect of better understanding technical scheme of the present invention and reaching.
Referring to shown in Figure 1, in one embodiment, the reverse of said escalator and moving sidewalk, hypervelocity and stall protection vital circuit comprise:
One input control module 1 is used to detect the running state of escalator and moving sidewalk, and detected signal is inputed to control and treatment module 2.
One control and treatment module 2; The employing PLD constitutes; For example adopt CPLD to realize,, judge whether to occur reverse, hypervelocity and stall according to the escalator of input control module 1 input and the operating state signal of moving sidewalk; When reverse, hypervelocity and/or stall occurring, 3 actions of control output execution module.All relevant control and treatment functions realize by described PLD in the present invention, do not adopt any microprocessor of being realized control by software program; That is to say the control and treatment module 2 that the present invention adopts PLD to realize, do not comprise the control and treatment module 2 that realizes by microprocessor.Said control and treatment function comprises escalator and moving sidewalk real-world operation speed and rotation direction detection, the running instruction analysis of escalator and detection certainly and the output control function that exceeds the speed limit and judge, reverse judgement, relay.
One output execution module 3; Be connected with control and treatment module 2; Its open contact is connected in the safety control loop of escalator and moving sidewalk, and is under the normal operating condition at escalator and moving sidewalk, and its open contact is closed; Its open contact breaks off when reverse, hypervelocity and/or stall occurring, realizes reverse, hypervelocity and/or stall safety guard-safeguard.
The signal that said input control module 1 detects comprises the signal of escalator and moving sidewalk real-world operation speed and real-world operation direction; The signal of the operating instruction of indication escalator and moving sidewalk running state makes said operating instruction input all confirm that according to redundant fashion promptly certain operating instruction all can be confirmed by the level logic that other incoming signal is formed mutually; Indication escalator and moving sidewalk are in the signal of specified running velocity state, perhaps are in the command signal of certain running velocity state of confirming.
Being used to detect the signal of escalator and moving sidewalk real-world operation speed and real-world operation direction, is the impulse singla of No. 2 photoelectric switchs output, A/B two phase signals of perhaps exporting for photoelectric encoder.
The signal of the operating instruction of indication escalator and moving sidewalk running state comprises following signal:
(1) upward signal, downgoing signal provide escalator instruction operation direction, in case when the service direction and instruction direction of actual measurement is inconsistent, can produce reversal protection, this incoming signal is necessary in vital circuit.
(2) run signal, the redundancy input as uplink/downlink signals offers vital circuit as Rule of judgment, and this incoming signal is necessary in vital circuit.
(3) the specified or a certain stable speed operation's indicator signal of high speed; As the stable signal that travels at the uniform speed under command speed run signal or a certain speed; This incoming signal is to select configuration in vital circuit, mainly offers vital circuit and judges that the speed in the PLD judges whether normally perhaps whether Hardware configuration is normal.
Each running state of escalator and moving sidewalk all is to confirm to have mutual redundancy check function by certain the several logic that combine in these command signals.The necessary command input signals of up low speed standby running state is: up effective, descending invalid, operation effectively, high speed is specified invalid.The running state of confirming thus should be more accurate, is difficult for receiving signal interference.
Said control and treatment module 2 comprises three PLDs, and wherein, input control module 1 detected signal inputs to first PLD 5 and second PLD 6 simultaneously.First PLD 5 has logic functions such as identical reverse, hypervelocity and stall judgement with second PLD 6, redundant reverse, hypervelocity and/or the stall protection function of realizing.7 pairs first PLDs 5 of the 3rd PLD and second PLD 6 carry out real-time running state monitoring.
Said output execution module 3 comprises at least 2 safety relaies, and wherein at least one safety relay 8 is connected with said first PLD 5, and another safety relay 9 is connected with said second PLD 6 at least.The open contact of all safety relaies is realized redundant safety guard-safeguard through series connected mode; The i.e. open contact of all safety relaies series connection is linked into the safety return circuit of escalator and moving sidewalk; Guarantee to cut off safety return circuit after arbitrary safety relay action wherein, cut off the energising of driving host and main band-type brake, when 1.4 times of hypervelocity apolegamys of this vital circuit configuration function; Then should cut off auxiliary band-type brake (secondary band-type brake) simultaneously, escalator and moving sidewalk are slowed down.Said first PLD 5 and second PLD 6 are controlled the action of the coupled safety relay that connects 8,9 respectively; Said the 3rd PLD can be controlled safety relay 8,9 actions that are connected with second PLD 6 with first PLD 5 simultaneously; When as long as any one detects reverse, hypervelocity and/or stall fault in first PLD 5, second PLD 6 and the 3rd PLD 7, then can make at least one said safety relay action.
Said reversal protection can adopt following mode to realize.
Usually the rotation direction of judging elevator motor can adopt photoelectric encoder or photoelectricity to realize near switch, shown in accompanying drawing 2.For example, in one embodiment 2 photoelectricity are installed on the Flywheel disc on the elevator motor axle near switch, produce A, the pulse of B phase of 90 ° of 2 phase differences, carry out sending into control and treatment module 2 after level is handled through input control module 1, i.e. CPLD.
CPLD judges elevator motor real-world operation direction with B front and back phase place mutually mutually through judging A, in case its actual service direction and instruction direction (upstream or downstream) produces reversal protection when inconsistent, makes the safety relay action of output execution module 3.Also will be further described in the following description this.
Said overspeed protection can adopt following mode to realize.
In one embodiment, adopt one, and stable clock accurately is used as the work clock of CPLD than high many of the A, the B impulse rate that produce under escalator and the moving sidewalk command speed running condition.With this clock two photoelectricity are counted near the A of switch output, the effective impulse pitch time of B phase pulse, the size of the count value that is drawn just can correspondence go out corresponding velocity amplitude.The concrete scheme drawing of realizing can be referring to shown in Figure 2.
Two photoelectricity are counted respectively near A, the pulse of B phase of switch output, can be reached the purpose of redundancy protecting.When detect two photoelectricity near arbitrary phase interpulse period of switch output less than escalator and moving sidewalk the interpulse period during with 1.2 times of command speves operations; And after continuing to surpass certain hour; Promptly think and exceed the speed limit 1.2 times; Make the safety relay action of output execution module 3, implement protection.Equally, when configuration during 1.4 times of overspeed protection functions, more higher leveled responsiveness setting value can be provided, 1.4 times of the constant speed degree of judging whether to exceed the quata when surpassing 1.4 times of command speves, make corresponding safety relay action, implement protection.
Fig. 3 is in the present embodiment as the inner structure block diagram of the CPLD of first and second PLDs.
Modular design is adopted in this CPLD internal logic design, and the The whole control processing capacity is realized by following sub-function module.Comprise first filtration module 11, second filtration module 12, command analysis module 17, direction check-out module 13, speed check- out module 14,15, AP-BP fault detection module 16, hypervelocity judge module 19 and running state machine module 18.
The radical function of command analysis module 17 is to confirm according to all command input signals combinatory logics which kind of operating instruction state escalator and moving sidewalk are in, and also can detect the command input signals combinatory logic level that should not occur under all normal circumstancess simultaneously.
The radical function of direction check-out module 13 is to judge the rotation direction of elevator motor according to the sequencing of A, the pulse of B phase.
The radical function of speed check- out module 14,15 is; Clock frequency through setting is counted the A of input, the effective impulse pitch time of B phase pulse; And when each input pulse finishes, produce pulsewidth counting latch signal, supply other module to read pulsewidth count value data.
The function of AP-BP fault detection module 16 is to produce impulse singla at the positive rise of AP, BP pulse (being A, the pulse of B phase) and falling edge respectively; Detect AP and BP simultaneously whether normal phase difference is arranged; Whether the pulse that is AP and BP has actv. part simultaneously; If not, explain that then photoelectricity installs wrong near switch or the device et out of order.
Running state machine module 18 radical functions are condition monitorings of realizing in the escalator operation process, comprise that reverse is judged, stall detects and the various logic fault detects.
Said escalator and moving sidewalk running state monitoring adopt following mode to realize.
In the present embodiment, utilize the running state machine module 18 of CPLD can realize the various control logic defencive functions of escalator and moving sidewalk.Input is analyzed according to operating instruction, can escalator and moving sidewalk state of living in be divided into following 4 kinds: up operation, descending operation, dead ship condition and instruction error status.Wherein up operation, descending operation, dead ship condition are referred to as normal condition.The transition diagram of the running state that is realized by running state machine module 18 can combine photoelectricity can carry out various control logics judgements near the output pulse of opening the light referring to shown in Figure 4, and concrete fault judgement is classified as follows.
(a) instruction fault:
Up-on command and downlink command are effectively;
Have one in up-on command or the downlink command effectively, but operating instruction is invalid;
Up-on command and downlink command are all invalid, but operating instruction is effective;
Up-on command, downlink command and operating instruction are all invalid, but the specified operating instruction of high speed is effective.
Any one situation of above situation takes place and continues certain more than the setting-up time T1, vital circuit output connection fault then, but safety relay is failure to actuate.If this fault continues certain longer setting-up time T2, and detect AP, when BP has pulse, safety relay moved.
(b) parking order fault: send and still detect AP behind parking order and the lasting specified time (under the normal circumstances parking order effectively back to system really be in the time that halted state needs) or be that pulse surpasses certain and sets quantity N1, make the safety relay action.
(c) up command fault: any situation of following situation then makes the safety relay action when taking place.
After getting into a certain setting-up time T3 of uplink state, do not detect AP or BP impulse singla yet;
After getting into a certain setting-up time T4 of uplink state,, and after AP or BP number of pulses surpass setting value N2, reverse when promptly thinking up if it is descending detecting the real-world operation direction;
When the specified operating instruction of high speed is effective,, and continue to surpass a certain setting-up time T5 if detect a certain preset proportion value (K1) % that actual speed is lower than command speed;
When the specified operating instruction of high speed is invalid,, and continue to surpass a certain setting-up time T6 if detect a certain preset proportion value (K2) % that actual speed is higher than command speed.
(d) down order fault: the arbitrary generation of following situation then makes the safety relay output action.
After getting into a certain setting-up time T3 of this downstream state, do not detect AP or BP impulse singla yet;
After getting into a certain setting-up time T4 of this downstream state,, and after AP or BP number of pulses surpass setting value N2, reverse when promptly thinking descending if to detect the real-world operation direction be up;
When the specified operating instruction of high speed is effective,, and continue to surpass a certain setting-up time T5 if detect a certain preset proportion value (K1) % that actual speed is lower than command speed;
When the specified operating instruction of high speed is invalid,, and continue to surpass a certain setting-up time T6 if detect a certain preset proportion value (K2) % that actual speed is higher than command speed.
7 pairs first PLDs 5 of said the 3rd PLD and second PLD 6 carry out real-time running state monitoring and can adopt following mode to realize.
The fault alarm output signal (being defined as WDT_A, WDT_B) of first PLD 5 and second PLD 6 and a certain setpoint frequency signal (being defined as PL_A, PL_B) that is produced by system clock are all inputed to the 3rd PLD 7, the waveform of these 2 groups of signals of real time monitoring.Implementation procedure simply is described below:
Pressing monitoring periods T8, WDT_A and WDT_B are carried out level ratio, is that level is different if continue 2 monitoring periods comparative results, thinks fault.
Press monitoring periods T9, the counted number of pulses of PL_A and PL_B is compared,, think fault if after continuing 2 monitoring periods and obtaining the count value difference and surpass certain setting value N3.
In case detect above arbitrary fault, then the 3rd PLD 7 self is exported breakdown signal, makes two safety relaies actions, breaks off safety return circuit.
The supervisory circuit that adopts CPLD to constitute can be realized comparatively improving the actv. monitoring function, and common electronic circuit is to be difficult to realize.
Adopt the detection certainly of CPLD realization safety relay contact can adopt following mode to realize.
Usually, vital circuit all is to continue to remain on connected state under the elevator normal circumstances always, i.e. it all is to be in attracting state for a long time that series connection inserts the open contact of safety relay wherein.Vital circuit commonly used in the past can not realize self-checking function, comprises control circuit or safety relay.Therefore there is certain hidden danger in long-term use.
In vital circuit of the present invention, just can realize self-checking function after the Using CPLD; First, second is operated with the detection certainly that the 3rd PLD all can be set the contact; Guarantee vital circuit under the long-play situation, safety relay in time detects because of the adhesion fault that long-term adhesive causes.
The concrete two parts that divide are realized:
Power-on self-test is surveyed.When vital circuit powers on and reset; All carry out the primary system self-checking detection process; CPLD realizes the time timing through the counting to system clock; Whether in certain the setting-up time T7 that at every turn powers on, carry out " being communicated with---cut-out---is communicated with " operation of one-period, detecting CPLD can normal operation to the safety relay of its control.Concrete implementation procedure is referring to shown in Figure 5.
Monitor in real time the contact.The normally closed contact that utilizes safety relay is understood the open contact action situation that this safety relay seals in safety return circuit as detecting return signal through CPLD in real time.This real time monitoring function that CPLD realizes can effectively prevent when safety relay breaks down, and system's appearance should be protected and the situation of being failure to actuate.
Incoming signal, fault holding time correlation parameter can adopt following mode to handle.
For concrete parameter such as the AP that need detect under fault judgement time length, other time-delay wait times and the various situation, BP pulse number; Be the time parameter T1～T11 described in the foregoing description, pulse number parameter N 1～N3 and proportionality coefficient K1～K2; According to the running condition of reality, confirm to draw corresponding optimal value through Theoretical Calculation and in-place test.
More than through embodiment the present invention is carried out detailed explanation, but these are not to be construed as limiting the invention.Those skilled in the art also can make some distortion and improvement (wait realize like the PLD that CPLD is changed into other) under the situation that does not break away from the principle of the invention, and these also should be regarded as belonging to protection scope of the present invention.
Claims (6)
1. reverse, hypervelocity and the stall protection vital circuit of escalator and moving sidewalk is characterized in that, comprising:
One input control module is used to detect the running state of escalator and moving sidewalk, and detected signal is inputed to the control and treatment module; The signal that said input control module detects comprises the signal of escalator and moving sidewalk real-world operation speed and real-world operation direction; The signal of the operating instruction of indication escalator and moving sidewalk running state makes said operating instruction input all confirm that according to redundant fashion promptly certain operating instruction all can be confirmed by the level logic that other incoming signal is formed mutually; Indication escalator and moving sidewalk are in the signal of specified running velocity state, perhaps are in the command signal of certain running velocity state of confirming;
One control and treatment module; The employing PLD constitutes, and according to the escalator of input control module input and the operating state signal of moving sidewalk, judges whether to occur reverse, hypervelocity and stall; When reverse, hypervelocity and/or stall occurring, the action of control output execution module;
One output execution module; Be connected with the control and treatment module; Its open contact is connected in the safety control loop of escalator and moving sidewalk, and is under the normal operating condition at escalator and moving sidewalk, and its open contact is closed; Its open contact breaks off when reverse, hypervelocity and/or stall occurring, realizes reverse, hypervelocity and/or stall safety guard-safeguard.
2. vital circuit as claimed in claim 1; It is characterized in that: said control and treatment module comprises three PLDs; Wherein, Redundant reverse, hypervelocity and/or the stall protection function of realizing of first PLD and second PLD, the 3rd PLD carries out real-time running state monitoring to first PLD and second PLD.
3. vital circuit as claimed in claim 2; It is characterized in that: said output execution module comprises at least 2 safety relaies; Wherein at least one safety relay is connected with said first PLD; At least another safety relay is connected with said second PLD, and the open contact of all safety relaies is realized redundant safety guard-safeguard through series connected mode; Said first PLD and second PLD are controlled the action of the coupled safety relay that connects respectively; Said the 3rd PLD can be controlled the safety relay action that is connected with second PLD with first PLD simultaneously; When as long as any one detects reverse, hypervelocity and/or stall fault in first PLD, second PLD and the 3rd PLD, then can make at least one said safety relay action.
4. like arbitrary described vital circuit among the claim 1-3, it is characterized in that: said PLD is CPLD, FPGA and/or GAL circuit.
5. vital circuit as claimed in claim 3; It is characterized in that: when powering at every turn; By said PLD safety relay is communicated with, breaks off control operation, when carrying out this control operation, carry out the closing of contact, open circuited feedback from detecting; During operation, whether the contact feedback signal of being monitored safety relay by PLD in real time is consistent with the action command of safety relay.
6. vital circuit as claimed in claim 3 is characterized in that: after the running velocity that detects escalator and moving sidewalk surpasses 1.2 times of command speves, cut off main brake loop by a safety relay and realize braking; After the running velocity that detects escalator and moving sidewalk surpasses 1.4 times of command speves, cut off secondary brake loop by a safety relay and realize braking.
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| CN 201010265233 CN102372222B (en) | 2010-08-26 | 2010-08-26 | Reverse, over-speed and stall protection safety circuit of escalator and moving walkway |
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| CN 201010265233 CN102372222B (en) | 2010-08-26 | 2010-08-26 | Reverse, over-speed and stall protection safety circuit of escalator and moving walkway |
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| CN103274284A (en) * | 2013-05-24 | 2013-09-04 | 康力电梯股份有限公司 | Escalator and sidewalk functional safety electronic monitoring device |
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| CN108975140A (en) * | 2018-08-28 | 2018-12-11 | 塞纳自动梯（佛山）有限公司 | A kind of escalator step tests the speed guard method and speed measuring device |
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