CN211626768U - Rail transit intrusion detection circuit based on function safety - Google Patents
Rail transit intrusion detection circuit based on function safety Download PDFInfo
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- CN211626768U CN211626768U CN202020441261.8U CN202020441261U CN211626768U CN 211626768 U CN211626768 U CN 211626768U CN 202020441261 U CN202020441261 U CN 202020441261U CN 211626768 U CN211626768 U CN 211626768U
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Abstract
The invention discloses a rail transit intrusion detection circuit based on functional safety, which relates to the safety protection design of rail transit dangerous areas such as subways, light rails and the like, and comprises a pressure pad state detection unit and a combined logic unit of a pressure pad and a threshold switch; the pressure pad state detecting unit includes a first pressure pad PM1, a second pressure pad PM2, and a safety relay; the safety relay provides two paths of redundant pressure pad detection, the state of the pressure pad is judged by detecting the resistance of the pressure pad, the two pressure pads carry out parallel detection, and the detection result states are respectively used for alarming and logical operation; the combinational logic unit is used for carrying out series connection processing on the threshold switch state and the detection state of the pressure pad on the basis of the pressure pad state detection unit; the invention adopts the mode of serial connection processing of the pressure pad and the threshold switch, thereby improving the reliability of the system; the safety of the function is improved by adopting the reverse logic design of power-off tripping and the fault detection function.
Description
Technical Field
The invention relates to an anti-intrusion system detection circuit design for dangerous areas of rail transit such as subways and light rails, which is particularly suitable for preventing the occurrence of the behavior of people entering the dangerous areas by mistake in the rail transit.
Background
Some dangerous areas exist in rail transit such as subways and light rails, such as rail traveling areas and power distribution rooms. To prevent personnel from mistakenly entering these hazardous areas, it is often necessary to provide an anti-intrusion detection system. I.e. at the entrance to the rail transit area or other hazardous area, a corresponding condition detection sensor is provided. For example, sensors such as a threshold switch and a pressure pad are arranged for detecting the position of a person and the opening and closing state of a door, and the states are sampled and sent to an Intrusion Detection System (IDS) for operations such as alarming or linkage power-off, so that the safety of personnel is ensured. However, because the humidity in the tunnel is relatively high, the working environment is relatively severe, and how to ensure the safe and reliable operation of the related sensors is related to the safety and reliability of the whole intrusion detection system. The invention provides an intrusion detection system sensor application circuit design based on functional safety, which is used for improving the reliability and the safety of an intrusion detection system.
Disclosure of Invention
In order to improve the reliability and the safety of the intrusion detection system, the pressure pads are arranged on two sides of the key entrance and exit, and when a person approaches the door and steps on the pressure pads, the corresponding pressure pads can trigger an alarm signal. Meanwhile, a threshold switch state detection signal is set, and when the door is opened, an alarm signal can be triggered. The triple redundant alarm design can effectively reduce the probability of missed alarm or false alarm of the intrusion event. The detailed arrangement is shown in figure 1. Because the pressure pad sets up the must passing through of door, often trample or the heavy object of being transported surpasss the bearing capacity of pressure pad, all probably leads to the damage of pressure pad, so need real-time detection pressure pad's health condition, as shown in fig. 2, the pressure pad of door both sides is received safety relay, and safety relay detects the people's state of trampling of pressure pad, can judge the healthy state of pressure pad simultaneously. If the device has a fault, the device can immediately alarm. Finally, the output of the safety relay and the state of the threshold switch are logically combined to generate an alarm or linkage signal to be accessed into an intrusion alarm system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a rail transit intrusion detection circuit based on functional safety comprises a pressure pad state detection unit and a combined logic unit of a pressure pad and a threshold switch;
the pressure pad state detecting unit includes a first pressure pad PM1, a second pressure pad PM2, and a safety relay; the safety relay provides two paths of redundant pressure pad detection, the state of the pressure pad is judged by detecting the resistance of the pressure pad, the two pressure pads carry out parallel detection, and the detection result states are respectively used for alarming and logical operation;
the combinational logic unit is used for carrying out series connection processing on the threshold switch state and the detection state of the pressure pad on the basis of the pressure pad state detection unit;
the alarm signal of the pressure pad state detection unit is connected with the logic operation circuit of the combined logic unit;
and the fault signal of the pressure pad state detection unit is connected with the alarm indication circuit of the combinational logic unit.
Further, the combinational logic unit comprises a power supply, a reset switch S1, a relay K1, a relay K2, a relay K3, a relay K4, a status indicator lamp L1, a status indicator lamp L2, a status indicator lamp L3 and a threshold switch DS 1;
a contact S1(a) of the reset switch S1 is connected with a normally closed contact DS1 of a power supply and threshold switch and a normally open contact K1(a) of a relay K1, a coil of the relay K1 is connected with a normally closed contact DS1 of the power supply and threshold switch, a contact S1(b) of the reset switch S1 is connected with an alarm signal PS1 of the power supply and safety relay and a normally open contact K2(a) of a relay K2, a coil of the relay K2 is connected with an alarm signal PS1 of the power supply and safety relay, a contact S1(c) of the reset switch S1 is connected with a normally open contact K3(a) of the power supply and safety relay and a normally open contact PS2 and K3 of the relay K3, a coil of the relay K3 is connected with an alarm signal PS 3(b) of the power supply and safety relay K3, and a normally open contact K3(b) of the relay K3 is connected with a normally open contact K3(b) of the relay K3 in parallel, Relay K3's coil is power connection after establishing ties, relay K2's normally closed contact K2(c) and status indicator lamp L1 are power connection after establishing ties, relay K4's normally closed contact K4(a) and status indicator lamp L2 are power connection after establishing ties, safety relay's fault signal AL1 and status indicator lamp L3 are power connection after establishing ties, relay K2's normally closed contact K2(d) inserts intrusion detection system's signal acquisition device IDS, realizes reporting to the police, relay K4's normally closed contact K4(b) inserts intrusion detection system's signal acquisition device IDS, realizes the linkage.
Further, the safety relay is an ESD3 safety relay.
Further, the two pressure pads and the threshold switch DS1 constitute a triple redundant configuration.
Furthermore, the pressure pad state detection unit and the combined logic unit are designed for the functional safety of the inverse logic of power-off tripping, after the reset switch S1 is pressed, the system enters a working state, when the system is powered off, a sensor is damaged or a relay is damaged, an alarm signal is automatically triggered, so that the functional safety design is realized, after the relevant alarm is triggered, only the alarm signal is eliminated, then the reset switch S1 is manually pressed, the corresponding alarm is reset, and the system can enter the working state again.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the redundant configuration and fault detection of the pressure pad and improves the reliability of the system;
2. the invention realizes the series connection processing of the pressure pad and the threshold switch, and improves the reliability of the system;
3. the invention realizes the reverse logic design and fault detection function of power-off tripping and realizes functional safety.
Drawings
Fig. 1 is a schematic view of the installation of the pressure pad and the threshold switch in this embodiment.
Fig. 2 is a schematic diagram of a pressure pad state detection circuit of the intrusion detection circuit in the present embodiment.
Fig. 3 is a schematic diagram of a combinational logic circuit of the intrusion detection circuit in the present embodiment.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and the detailed description.
The invention provides an intrusion detection system sensor application circuit design based on functional safety, which is used for improving the reliability and the safety of an intrusion detection system; the combined logic unit comprises a pressure pad state detection unit, a pressure pad and a threshold switch;
the pressure pad state detecting unit includes a first pressure pad PM1, a second pressure pad PM2, and a safety relay; the safety relay provides two paths of redundant pressure pad detection, the state of the pressure pad is judged by detecting the resistance of the pressure pad, the two pressure pads carry out parallel detection, and the detection result states are respectively used for alarming and logical operation;
the combinational logic unit is used for carrying out series connection processing on the threshold switch state and the detection state of the pressure pad on the basis of the pressure pad state detection unit;
the alarm signal of the pressure pad state detection unit is connected with the logic operation circuit of the combined logic unit;
and the fault signal of the pressure pad state detection unit is connected with the alarm indication circuit of the combinational logic unit.
As shown in fig. 1, the pressure pad and the threshold switch are installed schematically in this embodiment. A first pressure pad PM1, a second pressure pad PM2 and a threshold switch DS1 are arranged on two sides of the door, and when a person opens the door to enter a room, the first pressure pad PM1, the threshold switch DS1 and the second pressure pad PM2 are usually triggered in sequence. When the first pressure pad PM1 is triggered, the relay K2 and the status indicator lamp L1 are triggered, and the related safety equipment is not linked. When the threshold switch DS1 or the second pressure pad PM2 is further triggered, the interlock relay K4 and the status indicator lamp L2 are triggered.
As shown in fig. 2, the pressure pad status detection circuit of the present embodiment is schematically illustrated. The first pressure pad PM1 and the second pressure pad PM2 that set up on the both sides of door, under normal condition, the resistance of pressure pad is about 8.2K omega, and when someone trampled on the pressure pad, corresponding pressure can make the output resistance of pressure pad change, and safety relay ESD3 can trigger alarm signal PS1 or PS2 according to the change of resistance. Safety relay ESD3 triggers a fault alarm signal AL1 when the resistance of the pressure pad is too high or too low, i.e., the pressure pad fails, such as an open circuit or short circuit. The alarm signals PS1, PS2 and the fault signal AL1 generated by the pressure pad status detection unit are connected to the combinational logic unit.
As shown in fig. 3, the combinational logic circuit of the present embodiment is schematically illustrated. The system comprises a power supply, a reset switch S1, a relay K1, a relay K2, a relay K3, a relay K4, a status indicator lamp L1, a status indicator lamp L2, a status indicator lamp L3 and a threshold switch DS 1;
a contact S1(a) of the reset switch S1 is connected with a normally closed contact DS1 of a power supply and threshold switch and a normally open contact K1(a) of a relay K1, a coil of the relay K1 is connected with a normally closed contact DS1 of the power supply and threshold switch, a contact S1(b) of the reset switch S1 is connected with an alarm signal PS1 of the power supply and safety relay and a normally open contact K2(a) of a relay K2, a coil of the relay K2 is connected with an alarm signal PS1 of the power supply and safety relay, a contact S1(c) of the reset switch S1 is connected with a normally open contact K3(a) of the power supply and safety relay and a normally open contact PS2 and K3 of the relay K3, a coil of the relay K3 is connected with an alarm signal PS 3(b) of the power supply and safety relay K3, and a normally open contact K3(b) of the relay K3 is connected with a normally open contact K3(b) of the relay K3 in parallel, Relay K3's coil is power connection after establishing ties, relay K2's normally closed contact K2(c) and status indicator lamp L1 are power connection after establishing ties, relay K4's normally closed contact K4(a) and status indicator lamp L2 are power connection after establishing ties, safety relay's fault signal AL1 and status indicator lamp L3 are power connection after establishing ties, relay K2's normally closed contact K2(d) inserts intrusion detection system's signal acquisition device IDS, realizes reporting to the police, relay K4's normally closed contact K4(b) inserts intrusion detection system's signal acquisition device IDS, realizes the linkage.
In the intrusion detection sensor application circuit, the two pressure pads and the threshold switch DS1 constitute a triple redundant configuration. The pressure pad state detection unit and the combined logic unit are designed for the functional safety of the inverse logic of power-off tripping, and after S1 is pressed, the system enters a working state. When the system is powered off, the sensor is damaged or the relay is damaged, the alarm signal is automatically triggered, and therefore the functional safety design is achieved. When the relevant alarm is triggered, the system can enter the working state again only if the alarm signal is eliminated and then the corresponding alarm is reset by manually pressing S1.
The above embodiments are only for illustrating the technical idea of the implementation of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention falls within the protection scope of the present invention. The technology not related to the invention can be realized by the prior art.
Claims (4)
1. A rail transit intrusion detection circuit based on functional safety is characterized in that: the combined logic unit comprises a pressure pad state detection unit, a pressure pad and a threshold switch;
the pressure pad state detecting unit includes a first pressure pad PM1, a second pressure pad PM2, and a safety relay; the safety relay provides two paths of redundant pressure pad detection, the state of the pressure pad is judged by detecting the resistance of the pressure pad, the two pressure pads carry out parallel detection, and the detection result states are respectively used for alarming and logical operation;
the combinational logic unit is used for carrying out series connection processing on the threshold switch state and the detection state of the pressure pad on the basis of the pressure pad state detection unit;
the alarm signal of the pressure pad state detection unit is connected with the logic operation circuit of the combined logic unit;
and the fault signal of the pressure pad state detection unit is connected with the alarm indication circuit of the combinational logic unit.
2. The rail transit intrusion detection circuit based on functional safety according to claim 1, wherein: the combined logic unit comprises a power supply, a reset switch S1, a relay K1, a relay K2, a relay K3, a relay K4, a status indicator lamp L1, a status indicator lamp L2, a status indicator lamp L3 and a threshold switch DS 1;
a contact S1a of the reset switch S1 is connected with a normally closed contact DS1 of a power supply and threshold switch and a normally open contact K1a of a relay K1, a coil of the relay K1 is connected with a normally closed contact DS1 of the power supply and threshold switch, a contact S1 1 of the reset switch S1 is connected with an alarm signal PS1 of the power supply and safety relay and a normally open contact K2 1 of the relay K1, a coil of the relay K1 is connected with the alarm signal PS1 of the power supply and safety relay, a contact S1 1 of the reset switch S1 is connected with the alarm signal PS1 of the power supply and safety relay and the normally open contact K3 1 of the relay K1 in parallel, the normally open contact K1 1 of the relay K1 is connected with the normally open contact PS1 of the power supply and safety relay, the normally open contact K1 of the relay K1 is connected with the normally open contact K1 of the relay K1 in series, and the normally closed contact K1 is connected with the power supply and the normally closed contact K1 in series and is connected with the power supply and the relay K1 in series, normally closed contact K4a and the state pilot lamp L2 of relay K4 connect the power after establishing ties, fault signal AL1 and the state pilot lamp L3 of safety relay connect the power after establishing ties, relay K2's normally closed contact K2d inserts intrusion detection system's signal acquisition device IDS, realizes reporting to the police, relay K4's normally closed contact K4b inserts intrusion detection system's signal acquisition device IDS, realizes the linkage.
3. The rail transit intrusion detection circuit based on functional safety according to claim 2, wherein: the safety relay is an ESD3 safety relay.
4. The rail transit intrusion detection circuit based on functional safety according to claim 1, wherein: the two pressure pads constitute a triple redundant configuration with a limit switch DS 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020441261.8U CN211626768U (en) | 2020-03-30 | 2020-03-30 | Rail transit intrusion detection circuit based on function safety |
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| CN202020441261.8U CN211626768U (en) | 2020-03-30 | 2020-03-30 | Rail transit intrusion detection circuit based on function safety |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272317A (en) * | 2020-03-30 | 2020-06-12 | 南京国电南自轨道交通工程有限公司 | Rail transit intrusion detection circuit based on function safety |
| CN113263962A (en) * | 2021-06-28 | 2021-08-17 | 南京国电南自轨道交通工程有限公司 | Rail transit emergency power-off system |
-
2020
- 2020-03-30 CN CN202020441261.8U patent/CN211626768U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272317A (en) * | 2020-03-30 | 2020-06-12 | 南京国电南自轨道交通工程有限公司 | Rail transit intrusion detection circuit based on function safety |
| CN113263962A (en) * | 2021-06-28 | 2021-08-17 | 南京国电南自轨道交通工程有限公司 | Rail transit emergency power-off system |
| CN113263962B (en) * | 2021-06-28 | 2023-03-03 | 南京国电南自轨道交通工程有限公司 | Rail transit emergency power-off system |
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