CN102372222B - 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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- CN102372222B CN102372222B CN 201010265233 CN201010265233A CN102372222B CN 102372222 B CN102372222 B CN 102372222B CN 201010265233 CN201010265233 CN 201010265233 CN 201010265233 A CN201010265233 A CN 201010265233A CN 102372222 B CN102372222 B CN 102372222B
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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 it is classified as vital circuit.Now, used the electronic component of more complexity to realize needed function logic in the control circuit of electric safety device, 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 used electronic component in vital circuit, 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 be met the standard of PESSRAL (being applied in the programmable electronic system in elevator safety) by the electric safety device that software participates in realizing, must verify in strict accordance with the flow process of PESSRAL.No matter and the flow process of PESSRAL is that design or checking are all very complexes.
Requirement according to 14.2.2.4.1 in GB16899 (e), control setup should be automatically out of service in hypervelocity and the non-operating reversed lower escalator of service direction, and further stipulate at 14.2.2.4.2, the action that the switch in this situation disconnects should be completed by safety contact or vital circuit.
At present; the non-operating reversed protection of existing escalator and moving sidewalk does not realize by safety contact or vital circuit; do not meet the requirement of GB16899; and investigate by technological analysis; at present also do not have the failure-free scheme to realize non-operating reversed protection with the method for safety contact; therefore need a kind of method by vital circuit of invention to realize non-operating reversed protection, to satisfy the requirement of GB16899.
In addition, for the overspeed protection of escalator and moving sidewalk, at present major part all mechanically safety device realize, cost can exceed much comparatively speaking.
Summary of the invention
The technical problem to be solved in the present invention is to provide 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 for detection of the running state of escalator and moving sidewalk, and inputs to the control processing module with the signal that detects; The signal that described 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 described operating instruction input all confirm according to redundant fashion, and namely certain operating instruction is all confirmed by the level logic that other incoming signal forms 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 determining;
One controls processing module, the employing programmable logic device (PLD) consists of, 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/or stall, when reverse, hypervelocity and/or stall occurring, control the action of output execution module;
One output execution module; be connected with the control processing module; its open contact is connected in the safe control loop of escalator and moving sidewalk; and be under normal operating condition at escalator and moving sidewalk; its open contact is closed; its open contact disconnects when reverse, hypervelocity and/or stall occurring, realizes reverse, hypervelocity and/or stall safety guard-safeguard.
The present invention adopts programmable logic device (PLD) (the hardware circuit device of CPLD, FPGA, GAL circuit or the configuration of other capable of dynamic) to realize reverse, hypervelocity and the stall protection vital circuit of escalator and moving sidewalk.The control circuit of programmable logic device (PLD) has stronger antijamming capability, can satisfy stability and the reliability requirement of hardware circuit, and its powerful logic function can realize again complicated control processing capacity simultaneously.Described programmable logic device (PLD) is the hardware circuit device of CPLD (but complexity program logic device), FPGA (field programmable gate array), GAL (GAL) circuit or the configuration of other capable of dynamic; Do not comprise any microprocessor of being realized control by software program.
The reverse of escalator of the present invention and moving sidewalk, hypervelocity and stall protection vital circuit are all realizing the requirement of GB16899 defined fully aspect reversal protection, hypervelocity and stall protection.
The conventional security circuit is only completed function by simple electronics package, and is relatively reliable, and design and checking are relatively simple; But the circuit function by simple electronic devices and components structure can not be tackled complicated safety guard-safeguard usually, for realizing that escalator reverses judgement and hypervelocity arbitration functions, implements difficulty relatively.
Complex programmable logic device of the present invention is realized reverse, hypervelocity and the stall protection vital circuit of escalator and moving sidewalk, has all advantages of the common vital circuit that contains electronic component, simultaneously, meets the demands fully on design function.The vital circuit of Complex programmable logic device can realize the defencive function more complicated, that control accuracy is higher; Has powerful self-monitoring function; Process by incoming signal being configured flexibly various filtering, can improve the accuracy of incoming signal; The vital circuit cost of Complex programmable logic device is also very economical, and design and checking flow process are also relatively simple.Therefore programmable logic device (PLD) is applied to the vital circuit of escalator and moving sidewalk, for the development of escalator and moving sidewalk safety device, very large meaning is arranged.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and the specific embodiment:
Fig. 1 is reverse of the present invention, hypervelocity and stall protection vital circuit one embodiment system chart;
Fig. 2 is the schematic diagram that speed and rotation direction detect;
Fig. 3 is the inner structure block diagram of the first programmable logic device (PLD) and the second programmable logic device (PLD) one embodiment in Fig. 1;
Fig. 4 is the transition diagram of the running state of the escalator realized by state machine in the first programmable logic device (PLD) and the second programmable logic device (PLD) in Fig. 1 or moving sidewalk;
Fig. 5 is that in Fig. 1, first, second, and third programmable logic device (PLD) is surveyed procedure chart to the power-on self-test of safety relay.
The specific embodiment
As an example of CPLD example, content of the present invention is described in the following embodiments, so that the useful technique effect of better understanding technical scheme of the present invention and reaching.
Shown in Figure 1, in one embodiment, the reverse of described escalator and moving sidewalk, hypervelocity and stall protection vital circuit comprise:
One input control module 1 for detection of the running state of escalator and moving sidewalk, and inputs to control processing module 2 with the signal that detects.
One controls processing module 2, the employing programmable logic device (PLD) consists of, for example adopt CPLD to realize, according to the escalator of input control module 1 input and the operating state signal of moving sidewalk, judge whether to occur reverse, hypervelocity and stall, when reverse, hypervelocity and/or stall occurring, control 3 actions of output execution module.All relevant control processing capacities realize by described programmable logic device (PLD) in the present invention, do not adopt any microprocessor of being realized control by software program; That is to say the control processing module 2 that the present invention adopts programmable logic device (PLD) to realize, do not comprise the control processing module 2 that is realized by microprocessor.Described control processing capacity 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 processing module 2; its open contact is connected in the safe control loop of escalator and moving sidewalk; and be under normal operating condition at escalator and moving sidewalk; its open contact is closed; its open contact disconnects when reverse, hypervelocity and/or stall occurring, realizes reverse, hypervelocity and/or stall safety guard-safeguard.
The signal that described 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 described operating instruction input all confirm according to redundant fashion, and namely certain operating instruction all can be confirmed by the level logic that other incoming signal forms 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 determining.
For detection of the signal of escalator and moving sidewalk real-world operation speed and real-world operation direction, be the impulse singla of No. 2 photoelectric switch outputs, 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 as the redundant input of 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 option and installment in vital circuit, mainly offer vital circuit judge speed in programmable logic device (PLD) judge whether normal or hardware configuration whether normal.
Each running state of escalator and moving sidewalk is to determine 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, effective operation, high speed are specified invalid.The running state of determining thus should be more accurate, is difficult for being subjected to signal interference.
Described control processing module 2 comprises three programmable logic device (PLD), and wherein, the signal that input control module 1 detects inputs to the first programmable logic device (PLD) 5 and the second programmable logic device (PLD) 6 simultaneously.The first programmable logic device (PLD) 5 and the second programmable logic device (PLD) 6 have the logic functions such as identical reverse, hypervelocity and stall judgement, and redundancy realizes reverse, hypervelocity and/or stall protection function.The 3rd 7 pairs of programmable logic device (PLD) the first programmable logic device (PLD) 5 and the second programmable logic device (PLD) 6 are carried out real-time running state monitoring.
Described output execution module 3 comprises at least 2 safety relaies, and wherein at least one safety relay 8 is connected with described the first programmable logic device (PLD) 5, and other safety relay 9 is connected with described the second programmable logic device (PLD) 6.The open contact of all safety relaies is realized the safety guard-safeguard of redundancy by the mode of series connection; 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 that drives main frame and main band-type brake; when 1.4 times of hypervelocity apolegamy functions of this vital circuit configuration; should cut off simultaneously auxiliary band-type brake (secondary band-type brake), escalator and moving sidewalk are slowed down.Described the first programmable logic device (PLD) 5 and the second programmable logic device (PLD) 6 are controlled respectively coupled safety relay 8,9 action, described the 3rd programmable logic device (PLD) can be controlled safety relay 8,9 actions that are connected with the second programmable logic device (PLD) 6 with the first programmable logic device (PLD) 5 simultaneously, when as long as in the first programmable logic device (PLD) 5, the second programmable logic device (PLD) 6 and the 3rd programmable logic device (PLD) 7, any one detects reverse, hypervelocity and/or stall fault, can make at least one described safety relay action.
Described reversal protection can be realized in the following way.
Usually the rotation direction of judgement elevator motor can adopt photoelectric encoder or photoelectricity approach switch to realize, as shown in Figure 2.For example, in one embodiment 2 photoelectricity approach switchs are installed on the Flywheel disc on the elevator motor axle, the A, the pulse of B phase that produce 90 ° of 2 phase differences are undertaken sending into after level is processed by input control module 1 and are controlled processing module 2, i.e. CPLD.
CPLD judges elevator motor real-world operation direction by judgement A phase with B front and back phase place mutually, in case produce reversal protection when its actual service direction and instruction direction (upstream or downstream) is inconsistent, makes the safety relay action of output execution module 3.Also will be further described this in the following description.
Described overspeed protection can realize in the following way.
In one embodiment, adopt one more much higher than the A, the B impulse rate that produce under escalator and moving sidewalk command speed running condition, and stable clock accurately is used as the work clock of CPLD.With this clock, the A of two photoelectricity approach switch outputs, the effective impulse interval time of B phase pulse are counted, the size of drawn count value just can correspondence go out corresponding velocity amplitude.The schematic diagram of specific implementation can be shown in Figure 2.
A, the pulse of B phase to two photoelectricity approach switch outputs are counted respectively, can reach the purpose of redundancy protecting.When the arbitrary phase interpulse period that the output of two photoelectricity approach switchs detected 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; namely think and exceed the speed limit 1.2 times; make the safety relay action of output execution module 3, implement protection.Equally, when 1.4 times of over-speed protection functions of configuration, can provide more higher leveled responsiveness setting value, judge whether 1.4 times of super command speves, 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 the first and second programmable logic device (PLD).
Modular design is adopted in this CPLD internal logic design, and whole control processing capacity is realized by following sub-function module.Comprise the first filtration module 11, the 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 first filtration module 11 and the second filtration module 12 are all the synchronous filtering modules that filtering cycle parameterisable is set, main function is that incoming signal is carried out filtering, the assurance signal holding time is just thought authentic and valid signal over the setting-up time cycle, can get rid of because the spurious signal input that some interference causes.In the present embodiment to 4 tunnel order incoming signals (operation, up, descending, at a high speed) all to have added the cycle be the synchronous filtering of T10, to 2 road photoimpact incoming signals (AP, the BP) cycle of having adopted be the filtering of T11.
The radical function of command analysis module 17 is to determine 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 all should not occur under normal circumstances simultaneously.
The radical function of direction check-out module 13 is that the sequencing according to A, the pulse of B phase judges the rotation direction of elevator motor.
Speed check- out module 14,15 radical function are, by the clock frequency of setting, the A of input, the effective impulse interval time of B phase pulse are counted, and produce pulsewidth counting latch signal when each input pulse finishes, read pulsewidth count value data for other module.
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 simultaneously AP and BP whether normal phase difference is arranged, whether the pulse that is AP and BP has actv. part simultaneously, if not, illustrate that the installation of photoelectricity approach switch is wrong or install et out of order.
Running state machine module 18 radical functions are condition monitorings of realizing in the escalator operation process, comprise that reverse judges, stall detects and the various logic fault detects.
Described escalator and moving sidewalk running state monitoring are realized in the following way.
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, escalator and moving sidewalk status can 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 be shown in Figure 4, approaches the output pulse of opening the light in conjunction with photoelectricity and can carry out various control logics judgements, 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 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 occurs and continues certain more than setting-up time T1, vital circuit output connection fault, but safety relay is failure to actuate.If this fault continues certain longer setting-up time T2, and detect AP, when BP has pulse, make safety relay action.
(b) parking order fault: send and still detect AP or BP pulse after parking order and lasting specified time (parking order effectively then really be in the time that halted state needs to system) under normal circumstances and surpass certain and set quantity N1, make the safety relay action.
(c) up command fault: any situation of following situation makes the safety relay action when occuring.
After entering a certain setting-up time T3 of uplink state, AP or BP impulse singla do not detected yet;
After entering a certain setting-up time T4 of uplink state, be descending if detect the real-world operation direction, and after AP or BP number of pulses surpass setting value N2, reverse when namely thinking up;
When the specified operating instruction of high speed is effective, if detect actual speed lower than a certain preset proportion value (K1) % of command speed, and continue to surpass a certain setting-up time T5;
When the specified operating instruction of high speed is invalid, if detect actual speed higher than a certain preset proportion value (K2) % of command speed, and continue to surpass a certain setting-up time T6.
(d) down order fault: the arbitrary generation of following situation makes the safety relay output action.
After entering a certain setting-up time T3 of this downstream state, AP or BP impulse singla do not detected yet;
After entering a certain setting-up time T4 of this downstream state, be up if detect the real-world operation direction, and after AP or BP number of pulses surpass setting value N2, reverse when namely thinking descending;
When the specified operating instruction of high speed is effective, if detect actual speed lower than a certain preset proportion value (K1) % of command speed, and continue to surpass a certain setting-up time T5;
When the specified operating instruction of high speed is invalid, if detect actual speed higher than a certain preset proportion value (K2) % of command speed, and continue to surpass a certain setting-up time T6.
7 pairs of the first programmable logic device (PLD) 5 of described the 3rd programmable logic device (PLD) and the second programmable logic device (PLD) 6 are carried out real-time running state monitoring and can be realized in the following way.
The fault alarm output signal (being defined as WDT_A, WDT_B) of the first programmable logic device (PLD) 5 and the second programmable logic device (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 programmable logic device (PLD) 7, the waveform of these 2 groups of signals of real time monitoring.Implementation procedure is briefly described as follows:
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, if after continuing 2 monitoring periods and obtaining the count value difference and surpass certain setting value N3, think fault.
In case above arbitrary fault detected, the 3rd programmable logic device (PLD) 7 self is exported breakdown signal, makes two safety relaies actions, disconnects safety return circuit.
The supervisory circuit that adopts CPLD to consist of can be realized comparatively improving the actv. monitoring function, and common electronic circuit is to be difficult to realize.
Adopt CPLD to realize that the detection certainly of safety relay contact can realize in the following way.
Usually, vital circuit is all to continue to remain on connected state at elevator under normal circumstances always, i.e. the open contact of series connection access safety relay wherein is all to be in for a long time attracting state.Vital circuit commonly used can not realize self-checking function in the past, comprised control circuit or safety relay.Therefore there is certain hidden danger in long-term the use.
Just can realize self-checking function use CPLD in vital circuit of the present invention after, first, second, and third programmable logic device (PLD) all can be set the operation of detection certainly of contact, guarantee vital circuit in the long-play situation, safety relay in time detects because of the adhesion fault that long-term adhesive causes.
Concrete minute two parts 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 is by realizing the time timing to the counting of system clock, carry out " being communicated with---cut-outs---is communicated with " operation of one-period in certain the setting-up time T7 that at every turn powers on, detect CPLD and whether can work to the safety relay of its control.The specific implementation process is shown in Figure 5.
The contact Real-Time Monitoring.Utilize the normally closed contact of safety relay as detecting return signal, understand in real time by CPLD the open contact action situation that this safety relay seals in safety return circuit.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 be processed in the following way.
For design parameters such as the AP that need detect in fault judgement time length, other time-delay wait times and various situation, BP pulse numbers, be the time parameter T1～T11 described in above-described embodiment, pulse number parameter N 1～N3 and Proportional coefficient K 1～K2, according to the running condition of reality, determine to draw corresponding optimal value through theoretical calculating and in-place test.
More than the present invention will be described in detail by embodiment, but these are not to be construed as limiting the invention.Also can make some distortion and improvement (realizing as programmable logic device (PLD) of CPLD being changed into other etc.) in the situation that do not break away from principle of the invention those skilled in the art, these also should be considered as belonging to protection scope of the present invention.
Claims (6)
1. reverse, hypervelocity and the stall protection vital circuit of an escalator and moving sidewalk, is characterized in that, comprising:
One input control module for detection of the running state of escalator and moving sidewalk, and inputs to the control processing module with the signal that detects; The signal that described 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 described operating instruction input all confirm according to redundant fashion, and namely certain operating instruction is all confirmed by the level logic that other incoming signal forms 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 determining;
One controls processing module, the employing programmable logic device (PLD) consists of, 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/or stall, when reverse, hypervelocity and/or stall occurring, control the action of output execution module;
One output execution module; be connected with the control processing module; its open contact is connected in the safe control loop of escalator and moving sidewalk; and be under normal operating condition at escalator and moving sidewalk; its open contact is closed; its open contact disconnects 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: described control processing module comprises three programmable logic device (PLD); wherein; the first programmable logic device (PLD) and the second programmable logic device (PLD) redundancy realize reverse, hypervelocity and/or stall protection function, and the 3rd programmable logic device (PLD) is carried out real-time running state monitoring to the first programmable logic device (PLD) and the second programmable logic device (PLD).
3. vital circuit as claimed in claim 2, it is characterized in that: described output execution module comprises at least 2 safety relaies, wherein at least one safety relay is connected with described the first programmable logic device (PLD), other safety relay is connected with described the second programmable logic device (PLD), and the open contact of all safety relaies is realized the safety guard-safeguard of redundancy by the mode of series connection; Described the first programmable logic device (PLD) and the second programmable logic device (PLD) are controlled respectively the action of coupled safety relay, described the 3rd programmable logic device (PLD) can be controlled the safety relay action that is connected with the second programmable logic device (PLD) with the first programmable logic device (PLD) simultaneously, when as long as in the first programmable logic device (PLD), the second programmable logic device (PLD) and the 3rd programmable logic device (PLD), any one detects reverse, hypervelocity and/or stall fault, can make at least one described safety relay action.
4. as arbitrary described vital circuit in claim 1-3, it is characterized in that: described programmable logic device (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 described programmable logic device (PLD), safety relay is communicated with, disconnects control operation, carry out the feedback of the closing of contact, disconnection from detecting when carrying out this control operation; During operation, whether consistent with the action command of safety relay by the contact feedback signal of programmable logic device (PLD) Real Time Monitoring 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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| CN101746662A (en) * | 2008-12-17 | 2010-06-23 | 上海三菱电梯有限公司 | System for escalator and automatic moving pavement |
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| WO2007128245A1 (en) * | 2006-05-04 | 2007-11-15 | Otis Elevator Company | An overspeed protective device for escalator or moving walkway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1895986A (en) * | 2006-06-26 | 2007-01-17 | 巨人通力电梯有限公司 | Non-operating reversed and overspeed protector for automatic staircase or pavement |
| CN101264843A (en) * | 2008-03-05 | 2008-09-17 | 上海中业电梯有限公司 | Escalator operation safety monitoring method and device |
| CN201245398Y (en) * | 2008-05-30 | 2009-05-27 | 杭州西子孚信科技有限公司 | Anti-reverse control device of escalator |
| CN101746662A (en) * | 2008-12-17 | 2010-06-23 | 上海三菱电梯有限公司 | System for escalator and automatic moving pavement |
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