Fault diagnosis circuit for safety loop of platform screen door system and platform screen door system

Abstract

The present invention provides a safety circuit fault diagnosis circuit for a shielded door system and a shielded door system. In the safety circuit fault diagnosis circuit for a shielded door system provided by the present invention, a safety circuit fault diagnosis subcircuit for the shielded door system is respectively provided for each safety circuit relay in the safety circuit of the shielded door system. The front-end wiring harness state of the safety circuit relay is detected by a relay front-end wiring harness detection unit, and the open / close state of the safety circuit relay is detected by a relay open / close state detection unit. The front-end wiring harness states and the open / close state of the safety circuit relay can be detected and monitored in real time. The specific cause of the safety circuit fault can be discovered in time through the detection signal, whether it is the front-end wiring harness of the safety circuit relay being disconnected or the safety circuit relay not being closed. The specific location of the safety circuit fault can also be located in time through the detection signal, thereby greatly reducing maintenance and troubleshooting time and improving the operational reliability of rail transportation such as subways.

Description

Technical Field

[0001] The present invention relates to the field of automation technology, in particular to a safety loop fault diagnosis circuit for a shielding door system and a shielding door system. Background Art

[0002] The subway platform screen door system is an essential facility for modern subway projects. To ensure the safety of train operations, a safety circuit was incorporated into the subway track design. The platform screen door system's safety circuit is a ring circuit consisting of a safety circuit relay in each sliding door control unit (DCU) connected in series with the PSC safety relay coil. When all doors are closed and locked, all sliding door control units (DCUs) close the safety circuit relay, with a logical value of 1. This is transmitted to the PSC (central interface control panel), triggering the PSC safety relay to conduct, with a logical value of 1. This command is sent via a hard-wired control cable to the signaling system, which transmits it to the train. Only after receiving this command can the train depart safely. Otherwise, the train will immediately brake to troubleshoot and resume operation only after the fault is eliminated. This will not only affect the current train but also delay subsequent trains.

[0003] Therefore, the safety circuit is an important component to ensure the safe operation of the platform shield door system. Its rapid and intelligent fault diagnosis directly facilitates the operation of the subway track. However, the current safety circuit fault diagnosis and positioning can generally only detect whether the safety circuit relay of the current control unit is closed. If the connection line between the control units is disconnected, it cannot be located and still needs to be manually checked, which makes the fault diagnosis efficiency low. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a detection technical solution for the safety circuit of a shielded door system to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned and other related objects, the present invention provides a safety circuit fault diagnosis circuit for a platform screen door system. The platform screen door system safety circuit includes a plurality of safety circuit relays connected in series. The platform screen door system safety circuit fault diagnosis circuit includes a plurality of platform screen door system safety circuit fault diagnosis sub-circuits. The plurality of platform screen door system safety circuit fault diagnosis sub-circuits are connected to the plurality of safety circuit relays in a one-to-one correspondence. The platform screen door system safety circuit fault diagnosis sub-circuits include:

[0006] A relay front-end harness detection unit, connected to the safety circuit relay, detects a front-end harness state of the safety circuit relay, and outputs a first detection signal;

[0007] The relay opening and closing state detection unit is connected to the safety circuit relay, detects the opening and closing state of the safety circuit relay, and outputs a second detection signal.

[0008] Optionally, the shielding door system includes multiple door control units, each of the door control units includes a safety loop relay, the safety loop relay has a first pair of contacts, the first pair of contacts includes a first normally open point, a first common point and a first normally closed point, and the multiple safety loop relays are connected in series in sequence, the first normally open point of the latter safety loop relay is connected to the first common point of the previous safety loop relay, the first normally open point of the first safety loop relay is connected to the working voltage, and the first common point of the last safety loop relay is grounded.

[0009] Optionally, the relay front-end wiring harness detection unit includes a first resistor, a second resistor and a first optocoupler. The first normally open point of the safety loop relay is grounded after being connected in series with the first resistor and the second resistor. The positive pole of the input end of the first optocoupler is connected to the common end of the first resistor and the second resistor, the negative pole of the input end of the first optocoupler is grounded, the positive pole of the output end of the first optocoupler outputs the first detection signal, and the negative pole of the output end of the first optocoupler is grounded.

[0010] Optionally, the relay front-end wiring harness detection unit further includes a first capacitor, which is connected in parallel with the second resistor.

[0011] Optionally, the safety loop relay further has a second pair of contacts, and the second pair of contacts includes a second normally open point, a second common point and a second normally closed point.

[0012] Optionally, the relay opening and closing state detection unit includes a second optocoupler and a third resistor, the positive pole of the input end of the second optocoupler is connected to the working voltage after being connected in series with the third resistor, the negative pole of the input end of the second optocoupler is connected to the second normally open point of the safety loop relay, the second common point of the safety loop relay is grounded, the positive pole of the output end of the second optocoupler outputs the second detection signal, and the negative pole of the output end of the second optocoupler is grounded.

[0013] Optionally, the safety circuit fault diagnosis circuit of the platform shielding door system further includes a processing unit, which receives the first detection signal and the second detection signal, determines the status of the safety circuit of the platform shielding door system, and outputs corresponding status information.

[0014] In addition, to achieve the above-mentioned purpose and other related purposes, the present invention also provides a shielding door system, including a host computer and multiple door control units, each of the door control units includes a safety circuit relay, and multiple safety circuit relays are connected in series in sequence. The shielding door system also includes the above-mentioned shielding door system safety circuit fault diagnosis circuit, and the host computer receives the status information.

[0015] Optionally, the safety loop relay has a first pair of contacts, which include a first normally open point, a first common point and a first normally closed point. Multiple safety loop relays are connected in series in sequence, with the first normally open point of the latter safety loop relay connected to the first common point of the previous safety loop relay, the first normally open point of the first safety loop relay connected to the working voltage, and the first common point of the last safety loop relay connected to ground; the positive pole of the coil of the safety loop relay is connected to the working voltage, and the negative pole of the coil of the safety loop relay is grounded.

[0016] Optionally, each of the gate control units further includes a freewheeling diode. In each of the gate control units, the anode of the freewheeling diode is connected to the negative pole of the coil of the safety loop relay, and the cathode of the freewheeling diode is connected to the positive pole of the coil of the safety loop relay.

[0017] As described above, the safety circuit fault diagnosis circuit of the shielded door system of the present invention has the following beneficial effects:

[0018] For each safety circuit relay in the safety circuit of the shield door system, a corresponding shield door system safety circuit fault diagnosis subcircuit is set for detection. The front-end wiring harness status of the safety circuit relay is detected by the relay front-end wiring harness detection unit, and the open and closed status of the safety circuit relay is detected by the relay open and closed status detection unit. Therefore, the front-end wiring harness status of multiple safety circuit relays and the open and closed status of the safety circuit relay can be detected and monitored in real time, and the specific cause or type of the safety circuit fault can be discovered in time, and the specific location of the safety circuit fault can be located, which greatly reduces the maintenance and troubleshooting time and improves the operation reliability of rail transportation such as subways. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a circuit diagram of the safety circuit of the platform shield door system.

[0020] Figure 2 Shown is a circuit diagram of a safety circuit fault diagnosis sub-circuit of a shielded door system according to an embodiment of the present invention.

[0021] Figure 3 Display as Figure 2 Circuit diagram of the relay front end wiring harness detection unit.

[0022] Figure 4 Display as Figure 2 Circuit diagram of the relay open and close status detection unit.

[0023] Description of Reference Numerals

[0024] C1—first capacitor, D1~D24—freewheeling diodes, DCU1~DCU24—gate control units, R1—first resistor, R2—second resistor, R3—third resistor, U1—first optocoupler, U2—second optocoupler, VCC—operating voltage, GND—ground, 1—positive pole of the coil of the safety circuit relay, 16—negative pole of the coil of the safety circuit relay, 13—first common point of the safety circuit relay, 11—first normally closed point of the safety circuit relay, 9—first normally open point of the safety circuit relay, 4—second common point of the safety circuit relay, 6—safety circuit The second normally closed point of the safety circuit relay, 8—the second normally open point of the safety circuit relay, L0~L23—wiring harness terminals, RelayA—the first detection signal, RelayB—the second detection signal, 21—the positive input terminal of the first optocoupler U1, 22—the negative input terminal of the first optocoupler U1, 23—the negative output terminal of the first optocoupler U1, 24—the positive output terminal of the first optocoupler U1, 31—the positive input terminal of the second optocoupler U2, 32—the negative input terminal of the second optocoupler U2, 33—the negative output terminal of the second optocoupler U2, 34—the positive output terminal of the second optocoupler U2. DETAILED DESCRIPTION

[0025] As mentioned above in the background technology, Figure 1 As shown, the safety circuit of the shield door system is a ring circuit composed of the safety circuit relay in the door control unit (DCU1~DCU24) of each sliding door and the PSC safety relay coil in series. The current safety circuit fault diagnosis and positioning can generally only detect whether the safety circuit relay of the current door control unit DCU is closed. When the connection line between the door control units DCU is disconnected, it cannot be located and still needs to be manually checked, and the fault diagnosis efficiency is low.

[0026] Based on this, the present invention proposes a safety circuit fault diagnosis scheme for a shielded door system. For each safety circuit relay in the safety circuit of the shielded door system, a corresponding safety circuit fault diagnosis subcircuit is set for detection: first, the front-end wiring harness status of the safety circuit relay is detected by the relay front-end wiring harness detection unit; secondly, the open and closed status of the safety circuit relay is detected by the relay open and closed status detection unit, thereby performing real-time detection on the connection status of the front-end wiring harness in each door control unit and the open and closed status of the safety circuit relay.

[0027] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] See also Figure 1-Figure 4 . It should be noted that the diagrams provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the diagrams only show the electronic components related to the present invention and are not drawn according to the component type, number and layout during actual implementation. During actual implementation, the type, quantity and layout of each electronic component can be changed at will, and its layout type may also be more complex. The structural form, quantity and layout of the electronic components illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification or simple addition or subtraction of the structural electronic components should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "first" and "second" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0029] In detail, such as Figure 1 As shown in Figure 1, the subway platform platform door system consists of multiple door control units (DCU1-DCU24). Each door control unit (DCU1-DCU24) includes a safety circuit relay. These safety circuit relays are connected in series and then in series with the PSC safety relay coil, forming a loop. This is the platform platform door system's safety circuit. When all safety circuit relays are fully closed, a signal is transmitted, closing the PSC safety relay and sending a safety circuit signal.

[0030] In more detail, Figure 1 As shown, the safety circuit relay has a first pair of contacts, which includes a first normally open point 9, a first common point 13, and a first normally closed point 11. Multiple safety circuit relays are connected in series in sequence, with the first normally open point 9 of the subsequent safety circuit relay connected to the first common point 13 of the previous safety circuit relay (the first normally open point 9 of the second safety circuit relay is connected to the first common point 13 of the first safety circuit relay via the wiring harness terminal L1, the first normally open point 9 of the third safety circuit relay is connected to the first common point 13 of the second safety circuit relay via the wiring harness terminal L2, and so on, ..., the first normally open point 9 of the last safety circuit relay is connected to the first common point 13 of the second-to-last safety circuit relay via the wiring harness terminal L23). The first normally open point 9 of the first safety circuit relay is connected to the operating voltage VCC via the wiring harness terminal L0, and the first common point 13 of the last safety circuit relay is grounded GND. At the same time, the positive pole 1 of the coil of the safety circuit relay is connected to the operating voltage VCC, and the negative pole 16 of the coil of the safety circuit relay is grounded GND.

[0031] In more detail, Figure 1 As shown, each gate control unit (DCU1 to DCU24) also includes a freewheeling diode. In each gate control unit DCUi (i is an integer from 1 to 24), the anode of the freewheeling diode Di is connected to the negative pole 16 of the coil of the safety circuit relay, and the cathode of the freewheeling diode Di is connected to the positive pole 1 of the coil of the safety circuit relay: The gate control unit DCU1 includes a freewheeling diode D1. In the gate control unit DCU1, the anode of the freewheeling diode D1 is connected to the negative pole 16 of the coil of the safety circuit relay, and the cathode of the freewheeling diode D1 is connected to the positive pole 1 of the coil of the safety circuit relay. The positive pole 1 of the coil of the electrical appliance; the gate control unit DCU2 includes a freewheeling diode D2. In the gate control unit DCU2, the anode of the freewheeling diode D2 is connected to the negative pole 16 of the coil of the safety circuit relay, and the cathode of the freewheeling diode D2 is connected to the positive pole 1 of the coil of the safety circuit relay; and so on, ...; the gate control unit DCU24 includes a freewheeling diode D24. In the gate control unit DCU24, the anode of the freewheeling diode D24 is connected to the negative pole 16 of the coil of the safety circuit relay, and the cathode of the freewheeling diode D24 is connected to the positive pole 1 of the coil of the safety circuit relay.

[0032] In this embodiment, the present invention provides a screen door system safety circuit fault diagnosis circuit, which includes multiple independent screen door system safety circuit fault diagnosis sub-circuits, and the multiple screen door system safety circuit fault diagnosis sub-circuits are connected to multiple safety circuit relays in the screen door system safety circuit in a one-to-one correspondence, such as Figure 2 As shown, the safety circuit fault diagnosis sub-circuit of the shield door system includes:

[0033] A relay front-end harness detection unit is connected to the safety circuit relay, detects the front-end harness status of the safety circuit relay, and outputs a first detection signal RelayA;

[0034] The relay opening and closing state detection unit is connected to the safety circuit relay, detects the opening and closing state of the safety circuit relay, and outputs a second detection signal RelayB.

[0035] The following describes in detail the specific circuit structure and working principle of the safety circuit fault diagnosis subcircuit of the platform shielded door system, taking the safety circuit fault diagnosis subcircuit of the platform shielded door system corresponding to the door control unit DCU1 as an example.

[0036] In detail, such as Figure 2-Figure 3As shown, in the shield door system safety circuit fault diagnosis subcircuit corresponding to the door control unit DCU1, the relay front-end wiring harness detection unit includes a first resistor R1, a second resistor R2 and a first optocoupler U1. The first normally open point 9 (wiring harness terminal L0) of the safety circuit relay is connected in series with the first resistor R1 and the second resistor R2 and then grounded to GND. The positive input terminal 21 of the first optocoupler U' is connected to the common end of the first resistor R1 and the second resistor R2, the negative input terminal 22 of the first optocoupler U1 is grounded to GND, the positive output terminal 23 of the first optocoupler U1 outputs the first detection signal RelayA, and the negative output terminal 23 of the first optocoupler U1 is grounded to GND.

[0037] Alternatively, as Figure 2-Figure 3 As shown, the relay front-end harness detection unit further includes a first capacitor C1 , and the first capacitor C1 is connected in parallel with the second resistor R2 .

[0038] In more detail, Figure 2-Figure 3 As shown, the working principle of the relay front-end harness detection unit is as follows: when the front-end harness of the gate control unit DCU1 is normal (i.e., not disconnected), the harness terminal L0 is at a high level, so that the first optocoupler U1 is turned on, and the first detection signal RelayA is pulled down to the ground GND. That is to say, when the first detection signal RelayA is at a low level, the front-end harness of the gate control unit DCU1 is normal.

[0039] In detail, such as Figure 1-Figure 2 As shown, the safety loop relay further has a second pair of contacts, which includes a second normally open point 8 , a second common point 4 and a second normally closed point 6 .

[0040] In detail, such as Figure 2 and Figure 4 As shown, in the shield door system safety circuit fault diagnosis subcircuit corresponding to the door control unit DCU1, the relay open and close state detection unit includes a second optocoupler U2 and a third resistor R3. The positive input terminal 31 of the second optocoupler U2 is connected to the operating voltage VCC through the third resistor R3 connected in series. The negative input terminal 32 of the second optocoupler U2 is connected to the second normally open point 8 of the safety circuit relay. The second common point 4 of the safety circuit relay is grounded GND. The positive output terminal 34 of the second optocoupler U2 outputs the second detection signal RelayB, and the negative output terminal 33 of the second optocoupler U2 is grounded GND.

[0041] In more detail, Figure 2 and Figure 4As shown, the working principle of the relay opening and closing state detection unit is as follows: when the safety loop relay in the gate control unit DCU1 is closed, the second normally open point 8 of the safety loop relay is connected to the second common point 4, that is, the negative input terminal 32 of the second optocoupler U2 is grounded GND, so that the second optocoupler U2 is turned on, and the second detection signal RelayB is pulled down to the ground GND. That is to say, when the second detection signal RelayB is at a low level, the safety loop relay in the gate control unit DCU1 is closed.

[0042] Optionally, the safety circuit fault diagnosis circuit of the shielding door system also includes a processing unit (such as a single-chip microcomputer), which receives the first detection signal RelayA and the second detection signal RelayB, judges the status of the safety circuit of the shielding door system based on this, and outputs corresponding status information: if the first detection signal RelayA is at a low level, the front-end wiring harness is normal, otherwise the line segment wiring harness is abnormally disconnected; if the second detection signal RelayB is at a low level, the safety circuit relay is closed, otherwise the safety circuit relay is not closed.

[0043] At the same time, since a shield door system safety circuit fault diagnosis subcircuit is provided for each safety circuit relay in the shield door system safety circuit for detection, the front-end wiring harness status of multiple safety circuit relays and the open and closed status of the safety circuit relays are detected and monitored in real time. The processing unit receives the first detection signal RelayA and the second detection signal RelayB corresponding to the multiple safety circuit relays, and can promptly discover the cause of the fault (the front-end wiring harness of the safety circuit relay is disconnected or the safety circuit relay is not closed), and can also locate the specific location of the fault (specifically which one or several door control units), greatly reducing the maintenance and troubleshooting time.

[0044] In addition, in this embodiment, the present invention also provides a screen door system, which includes a host computer (not shown in the figure) and multiple door control units (DCU1 to DCU24), each of which includes a safety circuit relay. Figure 1 As shown, multiple safety circuit relays are connected in series in sequence. The shield door system also includes the above-mentioned shield door system safety circuit fault diagnosis circuit. The status information output after judgment by the host computer receiving processing unit can be used to more conveniently and intuitively discover and locate faults with the help of charts or documents, which is convenient for maintenance and troubleshooting.

[0045] To sum up, in the shield door system safety circuit fault diagnosis circuit and shield door system provided by the present invention, a shield door system safety circuit fault diagnosis sub-circuit is respectively provided for each safety circuit relay in the shield door system safety circuit, and the front-end wiring harness status of the safety circuit relay is detected by the relay front-end wiring harness detection unit, and the open and closed status of the safety circuit relay is detected by the relay open and closed status detection unit. The front-end wiring harness status of multiple safety circuit relays and the open and closed status of the safety circuit relay can be detected and monitored in real time. The specific cause of the safety circuit fault can be discovered in time through the detection signal, whether it is the front-end wiring harness of the safety circuit relay being disconnected or the safety circuit relay not being closed. The specific location of the safety circuit fault can also be located in time through the detection signal, which greatly reduces the maintenance and troubleshooting time and improves the operation reliability of rail transportation such as subways.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A safety circuit fault diagnosis circuit for a shielded door system, wherein the safety circuit of the shielded door system comprises a plurality of safety circuit relays connected in series, characterized in that: The shielded door system safety circuit fault diagnosis circuit includes a plurality of shielded door system safety circuit fault diagnosis sub-circuits, wherein the plurality of shielded door system safety circuit fault diagnosis sub-circuits are connected to the plurality of safety circuit relays in a one-to-one correspondence, and the shielded door system safety circuit fault diagnosis sub-circuit includes: A relay front-end harness detection unit, connected to the safety circuit relay, detects a front-end harness state of the safety circuit relay, and outputs a first detection signal; a relay opening and closing state detection unit, connected to the safety circuit relay, detecting the opening and closing state of the safety circuit relay and outputting a second detection signal; Wherein, the shielded door system includes a plurality of door control units, each of the door control units includes a safety circuit relay, the safety circuit relay has a first pair of contacts, the first pair of contacts includes a first normally open point, a first common point, and a first normally closed point, the plurality of safety circuit relays are connected in series in sequence, the first normally open point of the latter safety circuit relay is connected to the first common point of the former safety circuit relay, the first normally open point of the first safety circuit relay is connected to the operating voltage, and the first common point of the last safety circuit relay is grounded; The relay front-end harness detection unit includes a first resistor, a second resistor, and a first optocoupler. The first normally open point of the safety circuit relay is grounded after being connected in series with the first resistor and the second resistor. The positive electrode of the input end of the first optocoupler is connected to the common end of the first resistor and the second resistor. The negative electrode of the input end of the first optocoupler is grounded. The positive electrode of the output end of the first optocoupler outputs the first detection signal, and the negative electrode of the output end of the first optocoupler is grounded. The relay front-end harness detection unit further includes a first capacitor, which is connected in parallel with the second resistor; The safety circuit relay further has a second pair of contacts, wherein the second pair of contacts includes a second normally open point, a second common point and a second normally closed point; The relay opening and closing state detection unit includes a second optocoupler and a third resistor. The positive electrode of the input end of the second optocoupler is connected to the working voltage after being connected in series with the third resistor. The negative electrode of the input end of the second optocoupler is connected to the second normally open point of the safety loop relay. The second common point of the safety loop relay is grounded. The positive electrode of the output end of the second optocoupler outputs the second detection signal, and the negative electrode of the output end of the second optocoupler is grounded.

2. The safety circuit fault diagnosis circuit of the platform shield door system according to claim 1, characterized in that: The platform shield door system safety circuit fault diagnosis circuit further includes a processing unit, which receives the first detection signal and the second detection signal, determines the state of the platform shield door system safety circuit, and outputs corresponding state information.

3. A screen door system, characterized in that: It includes a host computer and multiple door control units, each of the door control units includes a safety circuit relay, and the multiple safety circuit relays are connected in series. The shielding door system also includes the shielding door system safety circuit fault diagnosis circuit according to claim 2, and the host computer receives the status information.

4. The screen door system according to claim 3, characterized in that: The safety loop relay has a first pair of contacts, which include a first normally open point, a first common point and a first normally closed point. Multiple safety loop relays are connected in series in sequence, with the first normally open point of the latter safety loop relay connected to the first common point of the previous safety loop relay, the first normally open point of the first safety loop relay connected to the working voltage, and the first common point of the last safety loop relay connected to ground; the positive pole of the coil of the safety loop relay is connected to the working voltage, and the negative pole of the coil of the safety loop relay is grounded.

5. The screen door system according to claim 4, characterized in that: Each of the gate control units further includes a freewheeling diode. In each of the gate control units, the anode of the freewheeling diode is connected to the negative pole of the coil of the safety loop relay, and the cathode of the freewheeling diode is connected to the positive pole of the coil of the safety loop relay.

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