CN114326369A - A safety circuit circuit of a platform door system - Google Patents

Abstract

The embodiment of the present application discloses a safety circuit circuit of a platform door system, including a first output end of a first solid state relay connected to a signal input end of a safety circuit, a second output end of the first solid state relay connected to a first output end of the second solid state relay The output end is connected, the first input end of the first solid state relay is connected with one end of the first travel switch, the second input end of the first solid state relay is connected with one end of the second travel switch and the DCU input signal end, the second The output end is connected with the first output end of the second solid state relay; the other end of the first travel switch is connected with the DCU input signal end; the other end of the second travel switch is connected with the first input end of the second solid state relay; The second input end of the two solid state relays is connected to the DCU input signal end, and the second output end of the second solid state relay is connected to the safety loop signal output end. The embodiments of the present application can solve the problem of circuit instability and improve the stability of the safety loop circuit.

Description

A safety circuit circuit of a platform door system

technical field

The embodiments of the present application relate to the field of platform door systems, and in particular, to a safety loop circuit of a platform door system.

Background technique

With its advantages of speed, punctuality, convenience and comfort, subway has become the main development direction of public transportation in modern cities. The control of the rail platform door, as a key component in the subway safety system, is directly related to and affects the safety and reliability of the subway operation.

In the prior art, the safety monitoring of subway platform doors is carried out by setting up safety circuits. Door closing locking switches are installed on sliding doors, emergency doors and end doors. The door closing locking switches and necessary circuits form a safety circuit. The safety circuit units of the unit are connected in series and returned to the platform door controller to form the platform door control system to close and lock the safety circuit.

However, in the current platform door safety circuit design, there is a problem that the control circuit is unstable and the platform door cannot work normally. At present, the instability of the control circuit in the design of the platform door safety circuit includes the jitter of the travel switch contacts, the asynchronous contact of the travel switch, and the abnormal operation of the entire safety circuit caused by a single contact failure. The contact jitter of the travel switch means that when the travel switch is not installed properly or is aging, the signal jitter is prone to occur when the travel switch is in action. Once the switch jitters, the signal state of the entire safety circuit will be unstable. When the contact of the travel switch vibrates, because the signal system detects the state jump of the safety circuit of the platform door, it is determined that the state of the platform door is unsafe, and the train is not allowed to enter or leave the station. It is necessary to manually operate the interlock release device on the platform control panel. to allow the train to enter and exit the station. Moreover, the situation of the contact vibration of the travel switch is often a flash, and it is difficult to troubleshoot and locate. Under normal circumstances, the contacts of the travel switch are triggered synchronously. When the travel switch is aged or installed in a critical position, the contact group of the travel switch will be out of synchronization. The current platform door safety circuit design is composed of all platform door travel switch contacts connected in series. Any group of travel switch failures on the main road, such as contact damage, poor contact, etc., will cause the entire side of the safety circuit to work abnormally. The sliding door safety circuit is short-circuited and bypassed, and the sliding door can be restored to normal operation only after maintenance.

SUMMARY OF THE INVENTION

The embodiment of the present application provides a safety circuit circuit of a platform door system, which can solve the problem of instability of the platform door safety circuit control circuit and improve the stability of the platform door safety circuit circuit.

In a first aspect, an embodiment of the present application provides a safety loop circuit of a platform door system, including a first solid state relay, a second solid state relay, a first travel switch, and a second travel switch;

Wherein, the first output end of the first solid state relay is connected to the safety circuit signal input end, the second output end of the first solid state relay is connected to the first output end of the second solid state relay, and the first output end of the first solid state relay is connected to the first output end of the second solid state relay. An input end is connected to one end of the first travel switch, and the second input end of the first solid state relay is connected to one end of the second travel switch and the DCU input signal end;

The other end of the first travel switch is connected to the DCU input signal end;

The other end of the second travel switch is connected to the first input end of the second solid state relay;

The second input end of the second solid state relay is connected to the DCU input signal end, and the second output end of the second solid state relay is connected to the safety circuit signal output end.

Further, the circuit further includes: a first normally open relay, a second normally open relay, a first normally closed relay, a second normally closed relay, a third travel switch and a fourth travel switch, the first normally open relay is arranged between the safety circuit signal input end and the first output end of the first solid state relay, and the second normally open relay is arranged between the second output end of the second solid state relay and the safety circuit signal output end;

One end of the first normally open relay is connected to the safety circuit signal input end, and the other end is connected to the first output end of the first solid state relay; one end of the second normally open relay is connected to the second output end of the second solid state relay , the other end of the second normally open relay is connected to the safety circuit signal output end;

One end of the first normally closed relay is connected with the safety circuit signal input end, and the other end is connected with one end of the third travel switch;

The other end of the third travel switch is connected to one end of the fourth travel switch;

The other end of the fourth travel switch is connected to one end of the second normally closed relay;

The other end of the second normally closed relay is connected with the signal output end of the safety circuit.

Further, the circuit further includes: a third solid state relay, the third solid state relay is disposed between the second output end of the second solid state relay and the second normally open relay;

The first input end and the second input end of the third solid state relay are connected to the first DCU control signal end, the first output end of the third solid state relay is connected to the second output end of the second solid state relay, and the The second output end of the third solid state relay is connected to one end of the second normally open relay;

The first DCU control signal terminal is used to control the conduction of the third solid state relay after detecting that the conduction signals of the first travel switch and the second travel switch are stable.

Further, the circuit further includes: the first normally open relay and the second normally open relay are respectively connected to the second DCU control signal terminal.

Further, the circuit further includes: the first normally closed relay and the second normally closed relay are respectively connected to the third DCU control signal terminal.

Further, the circuit further includes: the safety loop signal input end is connected to the safety loop signal output end of the previous platform door;

The safety loop signal output end is connected to the safety loop signal input end of the next platform door.

Further, the first limit switch is a limit switch of a sliding door, and the second limit switch is a limit switch of an emergency door.

Further, the third travel switch is a travel switch for a sliding door, and the fourth travel switch is a travel switch for an emergency door.

Further, the first solid state relay, the second solid state relay and the third solid state relay are DC type solid state relays.

The embodiment of the present application also provides an electronic device, including the above-mentioned safety circuit circuit of the platform door system.

In this embodiment of the present application, the first output end of the first solid state relay is connected to the safety circuit signal input end, and the first input end of the first solid state relay is connected to the first travel switch connected to the input signal end of the DCU, so as to control the first limit switch through the DCU signal. The travel switch is closed so that the first output end of the first solid state relay and the second output end of the first solid state relay are connected, so that the safety circuit signal passes through the first output end of the first solid state relay and the second output end of the first solid state relay, It is transmitted to the first output end of the second solid state relay, so that the conduction of the first solid state relay and the input of the DCU signal are triggered by the contact of the first travel switch, so that the signal input of the safety circuit and the signal input of the DCU are the same input source, This solves the problem that the safety circuit signal input is not synchronized with the travel switch contacts of the DCU signal input, thereby improving the stability of the platform door safety circuit circuit. In addition, the first output end of the second solid state relay is connected to the second output end of the first solid state relay, and the first input end is connected to the second travel switch connected to the input signal end of the DCU, so as to control the second travel switch to be closed by the DCU signal The first output end of the second solid state relay and the second output end of the second solid state relay are turned on, so that the safety circuit signal is transmitted to the safety circuit through the first output end of the second solid state relay and the second output end of the second solid state relay. The loop signal output terminal makes the conduction of the second solid state relay and the DCU signal input trigger the input through the contact of the second travel switch, so that the safety loop signal input and the DCU signal input are the same input source, thus solving the problem of the safety loop signal input. The problem of being out of sync with the travel switch contacts of the DCU signal input, thereby improving the stability of the platform door safety circuit circuit.

Description of drawings

1 is a schematic structural diagram of the safety circuit circuit of the first platform door system provided by an embodiment of the present application;

2 is a schematic structural diagram of the safety loop circuit of a second platform door system provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a safety circuit circuit of a third platform door system provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments.

FIG. 1 shows a schematic structural diagram of the safety circuit circuit of the first platform door system provided by the embodiment of the present application. Referring to FIG. 1 , the safety circuit circuit of the platform door system includes a first solid state relay, a second solid state relay, and a first travel switch 3 and the second travel switch 4; wherein, the first output end 6 of the first solid state relay is connected to the safety circuit signal input end 5, and the second output end 10 of the first solid state relay is connected to the first output end of the second solid state relay Connection 11, the safety loop signal input terminal 5 is connected to the safety loop signal output terminal 15 of the previous platform door. The first input end 7 of the first solid state relay is connected to one end of the first travel switch 3, the second input end 8 of the first solid state relay is connected to one end of the second travel switch 4 and the DCU (gating control unit) input signal end 9 is connected; the other end of the first travel switch 3 is connected to the DCU input signal end 9; the other end of the second travel switch 4 is connected to the first input end 12 of the second solid state relay; the second solid state relay The second input end 13 is connected with the DCU input signal end 9, the second output end 14 of the second solid state relay is connected with the safety loop signal output end 15, and the safety loop signal output end 15 is connected with the safety of the next platform door. The loop signal input terminal 5 is connected. The first limit switch 3 is a limit switch of a sliding door, and the second limit switch 4 is a limit switch of an emergency door.

The first solid state relay, the second solid state relay, the first travel switch 3 and the second travel switch 4 constitute the main road. When the platform door is powered on, after the DCU input signal terminal completes the self-test, and the main road is turned on, the first travel switch 3 and the second limit switch 4 are closed, so that the safety loop signal is transmitted from the safety loop signal input terminal 5 to the safety loop signal output terminal 15 through the first solid state relay and the second solid state relay.

The first output terminal 6 of the first solid state relay is connected to the safety circuit signal input terminal 5, and the first input terminal 7 of the first solid state relay is connected to the first travel switch 3 connected to the DCU input signal terminal 9, so as to be controlled by the DCU signal The first travel switch 3 is closed so that the first output end 6 of the first solid state relay and the second output end 10 of the first solid state relay are turned on, so that the safety circuit signal passes through the first output end 6 of the first solid state relay and the first solid state relay. The second output terminal 10 of the relay is transmitted to the first output terminal 11 of the second solid state relay, so that the conduction of the first solid state relay and the input of the DCU signal are triggered by the contact of the first travel switch 3 to realize the safety circuit signal. The input and the DCU signal input are the same input source, which solves the problem that the safety circuit signal input and the trip switch contact of the DCU signal input are not synchronized, thereby improving the stability of the platform door safety circuit circuit. In addition, the first output terminal 11 of the second solid state relay is connected to the second output terminal 10 of the first solid state relay, and the first input terminal is connected to the second travel switch 4 connected to the DCU input signal terminal 9, so as to be controlled by the DCU signal The second travel switch 4 is closed so that the first output end 11 of the second solid state relay and the second output end 14 of the second solid state relay are turned on, so that the safety circuit signal passes through the first output end 11 of the second solid state relay and the second solid state relay. The second output terminal 14 of the relay is transmitted to the safety circuit signal output terminal 15, so that the conduction of the second solid state relay and the DCU signal input are triggered by the contact of the second travel switch 4, and the safety circuit signal input and DCU signal are realized. The input is the same input source, which solves the problem that the safety circuit signal input and the trip switch contact of the DCU signal input are not synchronized, thereby improving the stability of the platform door safety circuit circuit.

FIG. 2 shows a schematic structural diagram of the safety circuit circuit of the second platform door system provided by the embodiment of the present application. Referring to FIG. 2 , the safety circuit circuit of the platform door system includes a first normally open relay 1 , a second normally open relay 2 , and a first normally open relay 2 . a solid state relay, a second solid state relay, a first travel switch 3, a second travel switch 4, a first normally closed relay 17, a second normally closed relay 18, a third travel switch 19 and a fourth travel switch 20; One end of the first normally open relay 1 is connected to the safety circuit signal input end 5, and the other end is connected to the first output end 6 of the first solid state relay; the first input end 7 of the first solid state relay is connected to the first travel switch. 3 is connected to one end, the second input end 8 of the first solid state relay is connected to one end of the second travel switch 4 and the DCU input signal end 9, and the second output end 10 of the first solid state relay is connected to the first end of the second solid state relay. An output end 11 is connected; the other end of the first travel switch 3 is connected to the DCU input signal end 9; the other end of the second travel switch 4 is connected to the first input end 12 of the second solid state relay; The second input terminal 13 of the two solid state relays is connected to the DCU input signal terminal 9, the second output terminal 14 of the second solid state relay is connected to one end of the second normally open relay 2; the other end of the second normally open relay 2 Connected with the safety circuit signal output end 15; one end of the first normally closed relay 17 is connected with the safety circuit signal input end 5, and the other end is connected with one end of the third travel switch 19; the other end of the third travel switch 19 is connected with one end of the fourth travel switch 20; the other end of the fourth travel switch 20 is connected with one end of the second normally closed relay 18; the other end of the second normally closed relay 18 is connected with the safety circuit signal output end 15 . The first normally open relay 1 and the second normally open relay 2 are respectively connected to the second DCU control signal terminal 16, and the first normally open relay 1 and the second normally open relay 2 are connected to the same DCU. The control signal terminal, or the first normally open relay 1 and the second normally open relay 2 are integrated in the same relay, and the first normally open relay 1 and the second normally open relay 2 are realized by closing different contacts. Function. The first normally closed relay 17 and the second normally closed relay 18 are respectively connected to the third DCU control signal terminal 21, and the first normally closed relay 17 and the second normally closed relay 18 are connected to the same DCU The control signal terminal, or the first normally closed relay 17 and the second normally closed relay 18 are integrated in the same relay, and the first normally closed relay 17 and the second normally closed relay 18 are realized by closing different contacts. Function. Or the first normally open relay 1, the second normally open relay 2, the first normally closed relay 17 and the second normally closed relay 18 are integrated in the same relay, and are realized by closing different contacts. Functions of the first normally open relay 1 , the second normally open relay 2 , the first normally closed relay 17 and the second normally closed relay 18 . The relay can be a double normally closed double normally open output relay. The third travel switch 19 is a travel switch for a sliding door, and the fourth travel switch 20 is a travel switch for an emergency door.

The first normally open relay 1, the second normally open relay 2, the first solid state relay, the second solid state relay, the first travel switch 3 and the second travel switch 4 constitute the main circuit, and the first normally closed relay 17, The second normally closed relay 18, the third travel switch 19 and the fourth travel switch 20 constitute a backup branch. When the platform door is in a power-off state or the trunk road is in an abnormal state, the safety circuit signal is output through the backup branch. When it is detected that the trunk circuit is abnormal, the first normally open relay 1 and the second normally open relay 2 are disconnected by stopping the second DCU control signal terminal 16 outputting the DCU control signal, so that the trunk circuit is in an open state. In addition, by closing the third travel switch 19 and the fourth travel switch 20, the backup branch is turned on, so that the safety circuit signal passes through the safety circuit signal input terminal 5, the first normally closed relay 17, the third travel switch 19, the first The four-stroke switch 20 and the second normally closed relay 18 are transmitted to the safety circuit signal output terminal 15 . By adopting the mode of active-standby switching in the embodiment of the present application, in the event of a power failure or failure of the main road, the work is carried out through the standby branch, which greatly improves the stability of the safety circuit of the platform door, and solves the problem that the safety of the whole side caused by the failure of a single contact is solved. The problem that the circuit works abnormally.

FIG. 3 shows a schematic structural diagram of a third platform door system safety circuit circuit provided in the embodiment of the present application. Referring to FIG. 3 , the platform door system safety circuit circuit includes a first normally open relay 1 , a second normally open relay 2 , and a third normally open relay 2 . A solid state relay, a second solid state relay, a first travel switch 3, a second travel switch 4, a first normally closed relay 17, a second normally closed relay 18, a third travel switch 19 and a fourth travel switch 20 and a third solid state relay A relay, the third solid state relay is arranged between the second output end 14 of the second solid state relay and the second normally open relay 2 .

One end of the first normally open relay 1 is connected to the safety circuit signal input end 5, and the other end is connected to the first output end 6 of the first solid state relay; the first input end 7 of the first solid state relay is connected to the first output end 6 of the first solid state relay. A travel switch 3 is connected to one end, the second input end 8 of the first solid state relay is connected to one end of the second travel switch 4 and the DCU input signal end 9, and the second output end 10 of the first solid state relay is connected to the second solid state relay. The first output end 11 of the relay is connected; the other end of the first travel switch 3 is connected with the DCU input signal end 9; the other end of the second travel switch 4 is connected with the first input end 12 of the second solid state relay; The second input end 13 of the second solid state relay is connected to the DCU input signal end 9, the second output end 14 of the second solid state relay is connected to the first output end 22 of the third solid state relay; The first input end 23 of the three solid state relays and the second input end 24 of the third solid state relay are connected to the first DCU control signal end 25 , and the second output end 26 of the third solid state relay is connected to the second normally open relay 2 One end is connected; the other end of the second normally open relay 2 is connected with the safety circuit signal output end 15 . The first DCU control signal terminal 25 is used to control the conduction of the third solid state relay after detecting that the conduction signals of the first travel switch 3 and the second travel switch 4 are stable. The first solid state relay, the second solid state relay and the third solid state relay are DC type solid state relays. One end of the first normally closed relay 17 is connected to the safety circuit signal input end 5 , and the other end is connected to one end of the third travel switch 19 ; the other end of the third travel switch 19 is connected to one end of the fourth travel switch 20 ; The other end of the fourth travel switch 20 is connected to one end of the second normally closed relay 18 ; the other end of the second normally closed relay 18 is connected to the safety circuit signal output terminal 15 . The first normally open relay 1 and the second normally open relay 2 are respectively connected to the second DCU control signal terminal 16, and the first normally open relay 1 and the second normally open relay 2 are connected to the same DCU. The control signal terminal, or the first normally open relay 1 and the second normally open relay 2 are integrated in the same relay, and the first normally open relay 1 and the second normally open relay 2 are realized by closing different contacts. Function. The first normally closed relay 17 and the second normally closed relay 18 are respectively connected to the third DCU control signal terminal 21, and the first normally closed relay 17 and the second normally closed relay 18 are connected to the same DCU The control signal terminal, or the first normally closed relay 17 and the second normally closed relay 18 are integrated in the same relay, and the first normally closed relay 17 and the second normally closed relay 18 are realized by closing different contacts. Function. Or the first normally open relay 1, the second normally open relay 2, the first normally closed relay 17 and the second normally closed relay 18 are integrated in the same relay, and are realized by closing different contacts. Functions of the first normally open relay 1 , the second normally open relay 2 , the first normally closed relay 17 and the second normally closed relay 18 . The relay can be a double normally closed double normally open output relay.

The first normally open relay 1, the second normally open relay 2, the first solid state relay, the second solid state relay, the third solid state relay, the first travel switch 3 and the second travel switch 4 constitute the main road, when the platform door is energized After the DCU input signal terminal 9 and the second DCU control signal terminal 16 complete the self-test, the second DCU control signal terminal 16 outputs the control signal to enable the signal relay coil, so that the first normally open relay 1 and the second normally open relay 2 closed, so that the main road is turned on. When the main road is turned on, the first travel switch 3 and the second travel switch 4 are closed, and the first normally open relay 1 and the second normally open relay 2 are closed, so that the safety circuit signal is passed from the safety circuit signal input terminal 5 through the first solid state relay. and the second solid state relay are transmitted to the first output terminal 22 of the third solid state relay. The first DCU control signal terminal 25 is used to output a corresponding control signal to the third solid state relay after detecting that the conduction signal of the first travel switch 3 and the second travel switch 4 is stable, so that the third solid state relay is turned on, so as to make the safety The loop signal is transmitted from the first output terminal 22 of the third solid state relay to the safety loop signal output terminal 15 through the second output terminal 26 of the third solid state relay. In the embodiment of the present application, the software controls the first DCU control signal terminal 25 to control the third solid-state relay to turn on after detecting that the turn-on signals of the first travel switch 3 and the second travel switch 4 are stable, thereby realizing the combined output control of software and hardware, so that the After waiting for the conduction signals of the first travel switch 3 and the second travel switch 4 to stabilize, the third solid-state relay is controlled to be turned on to transmit the safety circuit signal to the safety circuit signal output terminal 15, which solves the unstable state of the safety circuit signal caused by the jitter of the travel switch. problem, which improves the stability of the platform door safety loop circuit.

As mentioned above, the first output terminal 6 of the first solid state relay is connected to the first normally open relay 1, and the first input terminal 7 is connected to the first travel switch 3 connected to the DCU input signal terminal 9, so as to control the first travel through the DCU signal The switch 3 is closed so that the first output terminal 6 of the first solid state relay and the second output terminal 10 of the first solid state relay are turned on, so that the safety circuit signal passes through the first output terminal 6 of the first solid state relay and the first output terminal of the first solid state relay. The two output terminals 10 are transmitted to the first output terminal 11 of the second solid-state relay, so that the conduction of the first solid-state relay and the input of the DCU signal are triggered by the contact of the first travel switch 3 to realize the safety circuit signal input and DCU signal input. The signal input is the same input source, which solves the problem that the safety circuit signal input and the trip switch contact of the DCU signal input are not synchronized, thereby improving the stability of the platform door safety circuit circuit. In addition, the first output terminal 11 of the second solid state relay is connected to the second output terminal 10 of the first solid state relay, and the first input terminal is connected to the second travel switch 4 connected to the DCU input signal terminal 9, so as to be controlled by the DCU signal The second travel switch 4 is closed so that the first output end 11 of the second solid state relay and the second output end 14 of the second solid state relay are turned on, so that the safety circuit signal passes through the first output end 11 of the second solid state relay and the second solid state relay. The second output terminal 14 of the relay is transmitted to the safety circuit signal output terminal 15, so that the conduction of the second solid state relay and the DCU signal input are triggered by the contact of the second travel switch 4, and the safety circuit signal input and DCU signal are realized. The input is the same input source, which solves the problem that the safety circuit signal input and the trip switch contact of the DCU signal input are not synchronized, thereby improving the stability of the platform door safety circuit circuit.

The embodiment of the present application also provides an electronic device, including the above-mentioned safety circuit circuit of the platform door system.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present application.

In this application, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a It is a detachable connection or an integral body; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

It should be noted that, in this application, unless otherwise expressly specified and limited, the first feature "on" or "under" the second feature may be in direct contact with the first and second features, or the first and second features Features are indirectly contacted through an intermediary. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The above are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Equivalent replacements or changes to its application concept shall be covered within the protection scope of the present application.

Claims (10)

1. A platform door system safety loop circuit, comprising: the relay comprises a first solid-state relay, a second solid-state relay, a first travel switch and a second travel switch;

the first output end of the first solid-state relay is connected with a signal input end of a safety loop, the second output end of the first solid-state relay is connected with the first output end of the second solid-state relay, the first input end of the first solid-state relay is connected with one end of a first travel switch, and the second input end of the first solid-state relay is connected with one end of the second travel switch and a DCU input signal end;

the other end of the first travel switch is connected with a DCU input signal end;

the other end of the second travel switch is connected with a first input end of a second solid-state relay;

and a second input end of the second solid-state relay is connected with a DCU input signal end, and a second output end of the second solid-state relay is connected with a safety circuit signal output end.

2. A platform door system safety loop circuit according to claim 1, further comprising: the safety circuit comprises a first normally open relay, a second normally open relay, a first normally closed relay, a second normally closed relay, a third travel switch and a fourth travel switch, wherein the first normally open relay is arranged between a safety circuit signal input end and a first output end of a first solid-state relay, and the second normally open relay is arranged between a second output end of a second solid-state relay and a safety circuit signal output end;

one end of the first normally open relay is connected with the signal input end of the safety loop, and the other end of the first normally open relay is connected with the first output end of the first solid-state relay; one end of the second normally open relay is connected with the second output end of the second solid state relay, and the other end of the second normally open relay is connected with the signal output end of the safety loop;

one end of the first normally closed relay is connected with a signal input end of the safety loop, and the other end of the first normally closed relay is connected with one end of the third stroke switch;

the other end of the third travel switch is connected with one end of a fourth travel switch;

the other end of the fourth travel switch is connected with one end of a second normally closed relay;

and the other end of the second normally closed relay is connected with a signal output end of the safety circuit.

3. A platform door system safety loop circuit according to claim 2, wherein the circuit further comprises: the third solid-state relay is arranged between the second output end of the second solid-state relay and the second normally-open relay;

the first input end and the second input end of the third solid-state relay are connected with the first DCU control signal end, the first output end of the third solid-state relay is connected with the second output end of the second solid-state relay, and the second output end of the third solid-state relay is connected with one end of the second normally-open relay;

and the first DCU control signal end is used for controlling the conduction of the third solid-state relay after detecting that the conduction signals of the first travel switch and the second travel switch are stable.

4. A platform door system safety loop circuit according to claim 2, wherein the circuit further comprises: and the first normally-open relay and the second normally-open relay are respectively connected with a second DCU control signal end.

5. A platform door system safety loop circuit according to claim 2, further comprising: and the first normally closed relay and the second normally closed relay are respectively connected with a third DCU control signal end.

6. A platform door system safety loop circuit according to claim 1, further comprising: the safety loop signal input end is connected with the safety loop signal output end of the last platform door;

and the safety loop signal output end is connected with the safety loop signal input end of the next platform door.

7. A platform door system safety loop circuit as claimed in claim 1, wherein the first travel switch is a travel switch for a sliding door and the second travel switch is a travel switch for an emergency door.

8. A platform door system safety loop circuit as claimed in claim 2, wherein the third travel switch is a travel switch for a sliding door and the fourth travel switch is a travel switch for an emergency door.

9. A platform door system safety loop circuit according to claim 3, wherein the first, second and third solid state relays are dc type solid state relays.

10. An electronic device comprising a platform door system safety loop circuit as claimed in any one of claims 1 to 9.

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