CN204138119U - The safety protective circuit of a kind of escalator or moving sidewalk - Google Patents
The safety protective circuit of a kind of escalator or moving sidewalk Download PDFInfo
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- CN204138119U CN204138119U CN201420518846.XU CN201420518846U CN204138119U CN 204138119 U CN204138119 U CN 204138119U CN 201420518846 U CN201420518846 U CN 201420518846U CN 204138119 U CN204138119 U CN 204138119U
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- protective circuit
- safety protective
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- escalator
- optocoupler
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Abstract
The utility model discloses the safety protective circuit of a kind of escalator or moving sidewalk; comprise multiple detecting unit and control unit; described control unit comprises master controller and from controller; each detecting unit is by corresponding optical coupling isolation circuit Access Control unit respectively; described optical coupling isolation circuit comprises two optocouplers; the former limit of two optocouplers is connected to the mouth of detecting unit, and the secondary access master controller of one of them optocoupler, the secondary access of another optocoupler is from controller.In safety protective circuit of the present utility model when carrying out Redundant Control, there will not be and occur erroneous judgement because two paths of signals is different, improve the reliability of safety protective circuit.
Description
Technical field
The utility model relates to control and the protection field of escalator or moving sidewalk, is specifically related to the safety protective circuit of a kind of escalator or moving sidewalk.
Background technology
Universal along with escalator and moving sidewalk, the safety misadventure caused due to breakdown of equipment gets more and more, and safety problem also comes into one's own gradually.In escalator and moving sidewalk control system, most safety precautions can be realized by safety protective circuit, and safety protective circuit mainly comprises some detecting units, control unit and performance element.
Each detecting unit for detect escalator or moving sidewalk running velocity, whether occur non-operating reversed, additional brake action, check step or whether pedal lacks, whether drg is opened, and the handrail speed whether running state information such as abnormal, each detecting unit is usually by sensor or detector switch circuit realiration.
The mouth of detecting unit is connected with the input end of control unit; the running state information detected is input to control unit; control unit controls performance element according to running state information and completes corresponding safety precautions, and then realizes the safety protection function of escalator or moving sidewalk.
For avoiding disturbing mutually between detecting unit and control unit, isolated location (adopting as optical coupling isolation circuit) is set between detecting unit and control unit more and carries out electrical isolation, to be the running state information that detected by each detecting unit be divided into two-way by two photoelectric coupled circuit in parallel to specific practice, each road independent input is to control unit, control unit generally comprises master controller and from controller, in two photoelectric coupled circuit in parallel, a road connects master controller, another road connects from controller, master controller and independently can control performance element from controller, realize dual safety protection.But because the two paths of signals separated is separate, when a wherein road dropout, when an other road signal is normal, master controller is different with the information received from controller, may occur the situation of erroneous judgement, reduces the reliability of safety protective circuit on the contrary.
In addition, for realizing the integration of control system in practical application, safety protective circuit is integrated in the control housing of escalator and moving sidewalk more.For ensureing safety protective circuit supply regular power; need for safety protective circuit configure dedicated power supply (such as adopts storage battery; this power source special is only for the safety protective circuit in control housing is powered); once this power source special breaks down; the detection signal of detecting unit in safety protective circuit then can be caused to make mistakes, and then cause the defencive function of safety protective circuit to lose efficacy.
Utility model content
For the deficiencies in the prior art, the utility model provides the safety protective circuit of a kind of escalator or moving sidewalk, can to avoid in control unit master controller and between controller, signal contradiction occur.
The safety protective circuit of a kind of escalator or moving sidewalk; comprise multiple detecting unit and control unit; described control unit comprises master controller and from controller; each detecting unit is by corresponding optical coupling isolation circuit Access Control unit respectively; described optical coupling isolation circuit comprises two optocouplers; the former limit of two optocouplers is connected to the mouth of detecting unit, and the secondary access master controller of one of them optocoupler, the secondary access of another optocoupler is from controller.
In the utility model, optical coupling isolation circuit is on the one hand for realizing the electrical isolation of detecting unit and control unit; on the other hand; the signal that each detecting unit detects is divided into two-way; master controller is entered on one tunnel; one tunnel is entered from controller, and the former limit (emission side) of two optocouplers in buffer circuit is for being connected in series, when carrying out Redundant Control; there will not be the situation occurring because two paths of signals is different judging by accident, be conducive to the reliability improving safety protective circuit.
When carrying out safety guard-safeguard, the running state information detected is needed mainly to comprise main frame speed signal, step lossing signal, front edge board actuating signal and drg actuating signal and handrail speed signal etc.Detecting unit is for detecting the running state information of escalator or moving sidewalk, and the number of detecting unit depends on the kind of the running state information that needs detect.
Each detecting unit adopts detector switch or sensor to realize, and is gathered by detector switch or sensor completion status information signal.For certain running state information; general only an employing corresponding detector switch or sensor; such as main frame speed; a speed sensor can be adopted to obtain corresponding signal; no matter signal is normal or abnormal; because in buffer circuit, the former limit of two optocouplers is cascaded structure, therefore master controller is consistent with the signal received from controller all the time.
In escalator or moving sidewalk, for this running state information of handrail speed, often can use two sensors, although above-mentioned optical coupling isolation circuit can be adopted for each handrail sensor, but alternatively, two handrail sensors can be accessed master controller respectively and from controller, so, Redundant Control can be realized on the one hand by two handrail sensors, on the other hand, because each handrail sensor is only connected to master controller and from the one controller, therefore master controller and the signal received from controller also can remain consistent, can not conflict.
Based on this, the utility model additionally provides the safety protective circuit of another kind of escalator or moving sidewalk, comprise multiple detecting unit and control unit, described control unit comprises master controller and from controller, at least two detecting units are handrail sensor, one of them handrail sensor is by the first optocoupler access master controller, and another handrail sensor is accessed from controller by the second optocoupler;
All the other each detecting units are by corresponding optical coupling isolation circuit Access Control unit respectively, each optical coupling isolation circuit comprises two optocouplers, the former limit of two optocouplers is connected to the mouth of corresponding detecting unit, the secondary access master controller of one of them optocoupler, the secondary access of another optocoupler is from controller.
Because handrail sensor is only connected with an optocoupler, for ensureing the conformability of each detecting unit output voltage, as preferably, connect a voltage drop element respectively in the former limit of described first optocoupler and the second optocoupler, the pressure drop of described voltage drop element is identical with the former limit pressure drop of single optocoupler.
For ease of realizing, described voltage drop element is diode.The kind of diode is identical with the type of light-emitting diode in optocoupler, adopts silicon diode more.
At each detecting unit with corresponding optical coupling isolation circuit; the running state information that detecting unit detects is by Input Control Element after optical coupling isolation circuit; control unit is adjudicated according to the running state information of input; determine the safety method needing to take, and export corresponding control signal control performance element complete this safety method.
Described master controller is connected by full duplex communication interface with from controller.
Two controllers (comprise master controller and from controller) have independently crystal oscillating circuit, reset circuit, memory circuit separately, and master controller and accessed the data of the other side from controller by full duplex communication mode, monitor to each other.One of them controller lost efficacy, and another one controller all can be taken over job, and effectively can improve the safety of safety protective circuit, avoid causing safety misadventure.For improving data transmission rate, SPI interface (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) between two controllers, can be adopted.
Described safety protective circuit also comprises voltage regulation unit, and described voltage regulation unit comprises the mutually isolated mouth of two-way, and a road is connected with detecting unit and powers, and another road is connected with control unit and powers.
In the utility model, in fact voltage regulation unit plays transformation and pressure stabilization function, is required voltage for the voltage stabilization provided by power supply (additional power source, civil power or storage battery).Additional power source exports the mutually isolated voltage of two-way after voltage regulation unit, this two-way voltage " " separate, be respectively detecting unit and control unit is powered, make each circuit component of the former avris of optocoupler and secondary side independently-powered, reduce the mutual interference between power supply, realize electrical isolation function.The mutually isolated output voltage size of two-way should be mated with the operating voltage of detecting unit and control unit respectively.
As preferably, described voltage regulation unit comprises the first Switching Power Supply and the second switch power supply of series connection mutually, wherein the second switch Power supply belt mouth that has described two-way mutually isolated.
In actual applications, safety protective circuit needs to be integrated in the control housing of escalator or moving sidewalk usually.If directly use independently power supply specially for safety protective circuit is powered, not only to waste resource, and once quality problems (as output voltage is unstable) appear in this power supply, due to without backup power, whole safety protective circuit can be caused to lose efficacy.
If safety protective circuit directly also has problems with during other module common source, the output shakiness of power supply can be caused when other module load variations, also can affect the reliability of safety protective circuit.
The utility model is not separately safety protective circuit configure dedicated power supply; and the voltage regulation unit adopting double switch power to design; additional power source is connected by the input end of the first Switching Power Supply; first Switching Power Supply has some roads and exports; first Switching Power Supply Zhong You mono-tunnel exports and is connected with second switch power supply; by second switch power supply directly for safety protective circuit is powered, remaining each road is other module for power supply in control housing except safety protective circuit.When the sudden load change of other module, even if the output voltage of the first Switching Power Supply is unstable, second switch power supply also can be the voltage of safety protective circuit stable output.
Compared with prior art, the beneficial effects of the utility model are as follows:
(1) arrange by the redundancy of sensor or controller the reliability improving safety protective circuit, the improvement for optical coupling isolation circuit makes master controller remain consistent with the signal received from controller, can not conflict.
(2) adopt double switch power design, without the need to adopting power source special, and ensure to occur the situations such as fluctuation at the output voltage of the first Switching Power Supply, second switch power supply also Absorbable organic halogens is powered, and improves the reliability of full protection circuit further.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the safety protective circuit of embodiment 1;
Fig. 2 is the structure principle chart of the safety protective circuit of embodiment 1;
Fig. 3 is the structure principle chart of the safety protective circuit of embodiment 2.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment 1
As shown in Figure 1; safety protective circuit in the present embodiment comprises voltage regulation unit, multiple detecting unit, optical coupling isolation circuit, control unit and performance element; the signal detected is sent to control unit by optical coupling isolation circuit by each detecting unit, controls performance element by control unit.
The running state information kind that each detecting unit in the present embodiment can detect as required adopts corresponding sensor or detector switch.The running state information detected is needed to comprise main frame running velocity, step loss, front edge board action and drg action and handrail speed etc. in the present embodiment.For main frame running velocity, in the present embodiment, adopt closely speed sensor to detect main frame speed, this closely speed sensor be arranged on host driven wheel, according to the running velocity of the closely pulse period computation host of speed sensor.
In the present embodiment, control unit comprises master controller and from controller; master controller and realize mutually monitoring from the data that controller accesses the other side by full duplex communication mode; when one of them controller lost efficacy; another one controller can be taken over job; the reliability of safety protective circuit can be improved, avoid the generation of accident.For improving data transmission rate, between two controllers, SPI interface can be adopted to carry out full-duplex communication.
In order to improve the reliability of safety protective circuit; each detecting unit is by corresponding optical coupling isolation circuit Access Control unit respectively; as shown in Figure 2; each optical coupling isolation circuit comprises two optocouplers; the former limit of two optocouplers is connected to the mouth of detecting unit; the secondary (sensitive side) of one of them optocoupler accesses master controller, and the secondary access of another optocoupler is from controller.
In performance element, control the host power supply of escalator or moving sidewalk, band-type brake power supply and additional brake etc. by safety relay.When running state information is abnormal, is changed the mode of operation of escalator or moving sidewalk by the action of safety relay, realize safety protection function.
A performance element comprises two safety relaies, the open contact series connection of each safety relay, and normally closed contact is as feedback, and for same safety relay, the break-make of main controller controls open contact, detects the feedback signal of normally closed contact from controller.Safety relay is with forced guiding contact, and the action simultaneously of relay inner contact, compares with common relay, be not easy the problem occurring the excessive contact short caused of contactless power.
When considering practical application there is interference in sensor and the signal detected by detector switch, in the present embodiment, the output signal of detecting unit is accessed optical coupling isolation circuit after circuit (filter) and amplitude discrimination circuit successively after filtering, can interference be removed like this.Wherein the trigger voltage of amplitude discrimination circuit is arranged according to the operating voltage of sensor, and the trigger voltage suitably improving amplitude discrimination circuit is conducive to the antijamming capability improving detecting unit, prevents erroneous judgement, improves the reliability of vital circuit.The signal that in the present embodiment, sensor collects is generally the impulse singla or on-off signal that amplitude is 24V, the trigger voltage of amplitude discrimination circuit can be set to 9V, just can trigger amplitude discrimination circuit when impulse singla amplitude is greater than 9V and export high level, otherwise output low level.
Voltage regulation unit comprises the first Switching Power Supply and the second switch power supply of series connection mutually.First Switching Power Supply input end is used for being connected with additional power source, and the first Switching Power Supply comprises multiple-channel output, and wherein a road is connected with the input end of second switch power supply, and all the other each roads are as subsequent use or be that other circuit component of control system for escalator is powered.
Second switch power supply at least comprises the mutually isolated mouth of two-way, and the output voltage of two-way is respectively 3.3V and 20V, and 20V output voltage is detecting unit (sensor) power supply, and 3.3V output voltage is that control unit is powered.
The safety protective circuit of the present embodiment can be used alone also can be integrated in control housing and uses; when being integrated in control housing; in first Switching Power Supply each road mouth except connection second switch power supply, to remain in each road mouth and control housing other model calling to power.Now, even if the load changing of other module causes the output voltage of the first Switching Power Supply unstable, second switch power supply also can be the voltage of safety protective circuit stable output.In addition; because in control housing, module is numerous; usually need between disparate modules to carry out data exchange, therefore the safety protective circuit of the present embodiment is also provided with for carrying out the communication module (in the present embodiment for RS485 communicating circuit) of data exchange with other module.Accordingly, second switch power supply also should have the mouth for exporting 5V voltage, for powering for this communication module.
In the present embodiment, the principle of work of safety protective circuit is as follows:
When detecting unit no signal exports (namely output signal is low level); corresponding optocoupler output low level; master controller and carry out decision-making determination safety method according to the signal that optocoupler inputs from controller; and export corresponding control signal; each safety relay in performance element completes corresponding safety guard-safeguard action under the effect of this output signal, realizes the safety protection function of escalator or moving sidewalk.Utilize optical coupling isolation circuit that the signal that each detecting unit detects is divided into two-way in this safety protective circuit; master controller is entered on one tunnel; one tunnel is entered from controller; because the former limit of the optocoupler of two in buffer circuit is cascaded structure; therefore master controller is consistent with the signal received from controller all the time, there will not be because two paths of signals is different and causes the situation that the reliability of safety protective circuit reduces.
Embodiment 2
Safety protective circuit and the difference of embodiment 1 of the present embodiment are that the buffer circuit that wherein two detecting units (i.e. handrail sensor) connect is different, an optocoupler is only comprised in the optical coupling isolation circuit that each handrail sensor connects, specifically as shown in Figure 3, ground connection after one of them handrail sensor is connected in series with the former limit of corresponding filter, amplitude discrimination circuit and optocoupler successively, the input end that the collecting electrode of the secondary of optocoupler is corresponding to from controller connects, grounded emitter; Ground connection after another handrail sensor is connected in series with the former limit of corresponding filter, amplitude discrimination circuit and optocoupler successively, the input end that the collecting electrode of the secondary of this optocoupler is corresponding to master controller connects, grounded emitter.
For ensureing the conformability of the output voltage of each detecting unit, the negative electrode on the former limit of each optocoupler is all connected ground connection after a voltage drop element, and the pressure drop of this voltage drop element is identical with the pressure drop on the former limit of single optocoupler (also can be close).Voltage drop element can be diode, and for avoiding reversal connection, this voltage drop element also can be bidirectional diode.In the present embodiment, voltage drop element is BAV99 bidirectional diode.
Two handrail sensors are adopted to detect handrail speed in the safety protective circuit of the present embodiment; and access master controller and from controller respectively; Redundant Control can be realized on the one hand by two handrail sensors; on the other hand; because each handrail sensor is only connected to master controller and from the one controller; therefore master controller and the signal received from controller also can remain consistent, can not conflict.
Above-described detailed description of the invention has been described in detail the technical solution of the utility model and beneficial effect; be understood that and the foregoing is only most preferred embodiment of the present utility model; be not limited to the utility model; all make in spirit of the present utility model any amendment, supplement and equivalent to replace, all should be included within protection domain of the present utility model.
Claims (10)
1. the safety protective circuit of an escalator or moving sidewalk; comprise multiple detecting unit and control unit; described control unit comprises master controller and from controller; each detecting unit is by corresponding optical coupling isolation circuit Access Control unit respectively; it is characterized in that, described optical coupling isolation circuit comprises two optocouplers, and the former limit of two optocouplers is connected to the mouth of detecting unit; the secondary access master controller of one of them optocoupler, the secondary access of another optocoupler is from controller.
2. the safety protective circuit of escalator as claimed in claim 1 or moving sidewalk, it is characterized in that, described master controller is connected by full duplex communication interface with from controller.
3. the safety protective circuit of escalator as claimed in claim 1 or moving sidewalk; it is characterized in that; described safety protective circuit also comprises voltage regulation unit; described voltage regulation unit comprises the mutually isolated mouth of two-way; one tunnel is connected with detecting unit and powers, and another road is connected with control unit and powers.
4. the safety protective circuit of escalator as claimed in claim 3 or moving sidewalk; it is characterized in that; described voltage regulation unit comprises the first Switching Power Supply and the second switch power supply of mutually series connection, wherein the second switch Power supply belt mouth that has described two-way mutually isolated.
5. the safety protective circuit of an escalator or moving sidewalk, comprise multiple detecting unit and control unit, described control unit comprises master controller and from controller, it is characterized in that, at least two detecting units are handrail sensor, one of them handrail sensor is by the first optocoupler access master controller, and another handrail sensor is accessed from controller by the second optocoupler;
All the other each detecting units are by corresponding optical coupling isolation circuit Access Control unit respectively, each optical coupling isolation circuit comprises two optocouplers, the former limit of two optocouplers is connected to the mouth of corresponding detecting unit, the secondary access master controller of one of them optocoupler, the secondary access of another optocoupler is from controller.
6. the safety protective circuit of escalator as claimed in claim 5 or moving sidewalk, is characterized in that, connects respectively after a voltage drop element and be connected with the mouth of corresponding handrail sensor in described first optocoupler and the former limit of the second optocoupler.
7. the safety protective circuit of escalator as claimed in claim 6 or moving sidewalk, it is characterized in that, described voltage drop element is diode.
8. the safety protective circuit of escalator as claimed in claim 5 or moving sidewalk, it is characterized in that, described master controller is connected by full duplex communication interface with from controller.
9. the safety protective circuit of escalator as claimed in claim 5 or moving sidewalk; it is characterized in that; described safety protective circuit also comprises voltage regulation unit; described safety protective circuit also comprises voltage regulation unit; described voltage regulation unit comprises the mutually isolated mouth of two-way; one tunnel is connected with detecting unit and powers, and another road is connected with control unit and powers.
10. the safety protective circuit of escalator as claimed in claim 9 or moving sidewalk; it is characterized in that; described voltage regulation unit comprises the first Switching Power Supply and the second switch power supply of mutually series connection, wherein the second switch Power supply belt mouth that has described two-way mutually isolated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518846.XU CN204138119U (en) | 2014-09-10 | 2014-09-10 | The safety protective circuit of a kind of escalator or moving sidewalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518846.XU CN204138119U (en) | 2014-09-10 | 2014-09-10 | The safety protective circuit of a kind of escalator or moving sidewalk |
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| Publication Number | Publication Date |
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| CN204138119U true CN204138119U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420518846.XU Active CN204138119U (en) | 2014-09-10 | 2014-09-10 | The safety protective circuit of a kind of escalator or moving sidewalk |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107128788A (en) * | 2017-07-13 | 2017-09-05 | 巨人通力电梯有限公司 | A kind of security system structure of escalator |
| CN107879215A (en) * | 2017-10-31 | 2018-04-06 | 浙江升航电子科技有限公司 | A kind of band-type brake security monitoring circuit and method |
| CN112978524A (en) * | 2021-03-02 | 2021-06-18 | 北京索德电气工业有限公司 | Elevator function safety control system |
-
2014
- 2014-09-10 CN CN201420518846.XU patent/CN204138119U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107128788A (en) * | 2017-07-13 | 2017-09-05 | 巨人通力电梯有限公司 | A kind of security system structure of escalator |
| CN107879215A (en) * | 2017-10-31 | 2018-04-06 | 浙江升航电子科技有限公司 | A kind of band-type brake security monitoring circuit and method |
| CN112978524A (en) * | 2021-03-02 | 2021-06-18 | 北京索德电气工业有限公司 | Elevator function safety control system |
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