CN222498313U - Safety chain circuit fault diagnosis circuit, PCB and diagnosis system - Google Patents
Safety chain circuit fault diagnosis circuit, PCB and diagnosis system Download PDFInfo
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- CN222498313U CN222498313U CN202420495207.XU CN202420495207U CN222498313U CN 222498313 U CN222498313 U CN 222498313U CN 202420495207 U CN202420495207 U CN 202420495207U CN 222498313 U CN222498313 U CN 222498313U
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Abstract
本实用新型公开了一种安全链回路故障诊断电路、PCB板及诊断系统，所述电路包括安全继电器MS、触发单元、复位单元、信号采集单元和多个安全限位开关，多个安全限位开关的第一常闭触点组与安全继电器MS的引脚S11和引脚S12串联连接；所述触发单元的常闭端分别与安全继电器MS的引脚S12以及复位单元的一端连接，所述复位单元的另一端与安全继电器MS的引脚S34连接；多个所述安全限位开关的第二常闭触点组的一端以及另一端分别与信号采集单元的引脚COM和引脚X连接；本申请公开的电路，安全限位开关和安全继电器所形成的回路，可确保当任一安全限位开关动作时，自动扶梯的工作状态的可快速切换，信号采集单元与安全限位开关形成的回路可实现故障点的快速定位。
The utility model discloses a safety chain loop fault diagnosis circuit, a PCB board and a diagnosis system. The circuit comprises a safety relay MS, a trigger unit, a reset unit, a signal acquisition unit and a plurality of safety limit switches. The first normally closed contact group of the plurality of safety limit switches is connected in series with a pin S11 and a pin S12 of the safety relay MS; the normally closed end of the trigger unit is respectively connected with a pin S12 of the safety relay MS and one end of the reset unit, and the other end of the reset unit is connected with a pin S34 of the safety relay MS; one end and the other end of the second normally closed contact group of the plurality of safety limit switches are respectively connected with a pin COM and a pin X of the signal acquisition unit; the circuit disclosed in the present application, the loop formed by the safety limit switch and the safety relay can ensure that when any safety limit switch is actuated, the working state of the escalator can be quickly switched, and the loop formed by the signal acquisition unit and the safety limit switch can realize the rapid positioning of the fault point.
Description
Technical Field
The utility model relates to the technical field of fault diagnosis, in particular to a safety chain loop fault diagnosis circuit, a PCB and a diagnosis system.
Background
The escalator is used as an important supporting facility of a modern rail transit station, can effectively improve the comfort level of passenger riding rail transit, is greatly convenient for people to go out, and is an indispensable transportation tool in daily life of people nowadays.
Because the escalator and the passenger are in zero-distance contact, the design and the guarantee of personal safety of the passenger are not ignored; according to the international and domestic standards related to the installation and manufacture of the escalator, a plurality of safety limit switches are arranged around the escalator to detect various faults possibly occurring on the escalator so as to ensure the safe operation of the escalator, all the safety switches are connected into a safety chain loop, when any one of the safety switches acts, the escalator can stop operation or prevent starting, and the escalator can be restarted only after a reset button is pressed under the condition of fault relief.
The existing part of safety chain circuit design simply connects a group of normally closed contacts of all safety limit switches installed on an escalator in series to form a safety chain circuit, one end of the safety chain circuit is connected with one end of a contactor coil, the other end of the safety chain circuit is connected with a control power supply of the contactor, when any one safety limit switch on the safety chain acts, the control power supply of the contactor is cut off, the contactor contacts cut off the power supply of a driving motor of the escalator again, and the aim of stopping the escalator is achieved.
In the existing part of safety chain loop design, a line is led out separately at each safety limit switch node in the whole safety chain loop to be connected to an escalator control system to acquire whether a high-level signal of the node of the safety chain is missing or not, so that the safety limit switch nearest to the node is diagnosed to act, but when a plurality of safety limit switches on the safety chain act simultaneously, the diagnosis scheme only can diagnose the nearest node which is missing from the high-level signal, but can not diagnose the action states of all safety limit switches which act between the node and a power supply, the problem that detection is incomplete exists, and whether a fault point comprises a plurality of safety limit switches is difficult to confirm.
The existing part of safety chain loop design is to fully connect all safety limit switches in the safety chain loop back to the escalator control system, and signal judgment is carried out on each safety limit switch by the escalator control system to judge the action state of the safety limit switch, so that the problems of multiple cables and messy field wiring exist, and the cable laying cost is increased.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of utility model
In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide a safety chain loop fault diagnosis circuit, which can quickly switch the operation state of an escalator to the shutdown state when a fault occurs, and can quickly confirm the position of a fault point, thereby improving the operation and maintenance efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The safety chain loop fault diagnosis circuit comprises a safety relay MS, a trigger unit, a reset unit, a signal acquisition unit and a plurality of safety limit switches, wherein the safety limit switches comprise a first normally closed contact set and a second normally closed contact set, the first normally closed contact sets of the safety limit switches, a pin S11 of the safety relay MS and a pin S12 of the safety relay MS are connected in series, the normally closed ends of the trigger unit are respectively connected with the pin S12 of the safety relay MS and one end of the reset unit, the other end of the reset unit is connected with the pin S34 of the safety relay MS, the coil ends of the trigger unit are respectively connected with the pin 14 and the pin 24 of the safety relay MS, the normally open ends of the trigger unit are used for being connected with a driving motor of an escalator, one ends of the second normally closed contact sets of the safety limit switches are respectively connected with the pin COM of the signal acquisition unit, and the other ends of the second normally closed contact sets of the safety limit switches are respectively connected with the pin X of the signal acquisition unit.
In the safety chain loop fault diagnosis circuit, a pin S21 and a pin S22 of the safety relay MS are respectively grounded, and a pin 13, a pin 23 and a pin A1 of the safety relay MS are respectively used for being connected with a power supply unit.
In the safety chain loop fault diagnosis circuit, the triggering unit comprises a first contactor CM1 and a second contactor CM2, wherein a coil of the first contactor CM1 is connected with a pin 14 of the safety relay MS, a coil of the second contactor CM2 is connected with a pin 24 of the safety relay MS, a pin 22 of a normally closed contact of the second contactor CM2 is connected with a pin 12 of the safety relay MS, a pin 21 of the normally closed contact of the second contactor CM2 is connected with a pin 21 of the normally closed contact of the first contactor CM1, a pin 21 of the normally closed contact of the first contactor CM1 is connected with the reset unit, and a normally open end of the first contactor CM1 and a normally open end of the second contactor CM2 are respectively used for being connected with a driving motor of the escalator.
In the safety chain loop fault diagnosis circuit, the reset unit includes a reset switch SW1, a pin 2 of the reset switch SW1 is connected with a pin 21 of a normally closed contact of the first contactor CM1, and a pin 1 of the reset switch SW1 is connected with a pin S34 of the safety relay MS.
In the safety chain loop fault diagnosis circuit, the safety limit switches comprise N, wherein N is greater than or equal to 3 and is an integer, the pins X of the signal acquisition unit comprise N, the other ends of the second normally closed contact sets of the N safety limit switches are respectively and correspondingly connected with the N pins X of the signal acquisition unit, and 485 pins of the signal acquisition unit are used for being connected with a control system of the escalator.
The safety chain circuit fault diagnosis circuit further comprises a fuse FUO, wherein a plurality of the first normally closed contact sets of the safety limit switch, a pin S11 of the safety relay MS, a pin S12 of the safety relay MS and the fuse FUO are connected in series.
The application also correspondingly provides a PCB board on which the safety chain loop fault diagnosis circuit is printed.
The application also correspondingly provides a safety chain loop fault diagnosis system which comprises a fault detection device, a control system and a driving motor, wherein the fault detection device adopts the safety chain loop fault diagnosis circuit to realize working control, the normally open end of the fault detection device is connected with the driving motor, and the digital signal end of the fault detection device is connected with the control system.
The beneficial effects are that:
the utility model provides a safety chain loop fault diagnosis circuit, which is characterized in that a loop formed by a safety limit switch and a safety relay can ensure that the working state of an escalator can be quickly switched to a shutdown state when any safety limit switch acts, and the loop formed by a signal acquisition unit and the safety limit switch can realize quick positioning of a fault point and improve operation and maintenance efficiency.
Drawings
FIG. 1 is a first circuit block diagram of a safety chain loop fault diagnosis circuit provided by the present utility model;
fig. 2 is a second circuit configuration diagram of the safety chain loop fault diagnosis circuit provided by the utility model.
The main element symbol is to explain a 1-driving motor, a 2-signal acquisition unit and a 3-control system.
Detailed Description
The utility model provides a safety chain loop fault diagnosis circuit, a PCB and a diagnosis system, which are used for making the purposes, the technical scheme and the effects of the utility model clearer and more definite, and the utility model is further described in detail below by referring to the accompanying drawings and the embodiments.
In the description of the present utility model, it should be understood that the terms "mounted," "connected," and the like should be construed broadly, and that the specific meaning of the terms in the present utility model may be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and 2, the utility model provides a safety chain loop fault diagnosis circuit, which comprises a safety relay MS, a trigger unit, a reset unit, a signal acquisition unit 2 and a plurality of safety limit switches, wherein the safety limit switches comprise a first normally closed contact group and a second normally closed contact group, the first normally closed contact group of the safety limit switches, a pin S11 of the safety relay MS and a pin S12 of the safety relay MS are connected in series, the normally closed end of the trigger unit is respectively connected with the pin S12 of the safety relay MS and one end of the reset unit, the other end of the reset unit is respectively connected with a pin S34 of the safety relay MS, the coil end of the trigger unit is respectively connected with a pin 14 and a pin 24 of the safety relay MS, the normally open end of the trigger unit is used for being connected with a driving motor 1 of an escalator, one end of the second normally closed contact group of the safety limit switches is respectively connected with a pin COM of the signal acquisition unit 2, and the other end of the second normally closed contact group of the safety limit switches is respectively connected with a pin X of the signal acquisition unit 2.
The application discloses a safety chain loop fault diagnosis circuit, which is characterized in that a plurality of safety limit switches are connected with a safety relay in series, when any safety limit switch acts, the safety relay can control a trigger unit to stop working so as to control a driving motor 1 of an escalator to stop working, so that the working state of the escalator is quickly switched to a shutdown state, the safety limit switches are connected with a signal acquisition unit 2, which can quickly confirm which safety limit switch acts, namely, the quick positioning of a fault point can be realized, the operation and maintenance efficiency is improved, and furthermore, the signal acquisition unit 2 is a distributed digital signal acquisition module in an escalator junction box close to the safety limit switch, so that the connection distance can be greatly shortened, the complexity of on-site wiring is reduced, and the wiring cost is reduced.
In this embodiment, the first normally closed contact group 11-12 of each safety limit switch in the safety chain loop is connected in series through the nearby escalator junction box to form the safety chain loop, and finally connected to the pin S11 and the pin S12 of the special safety relay MS for the control cabinet, and the safety relay MS adopts dual-channel monitoring, so that the safety level of the safety chain loop reaches to EN954-1 level 4 at the highest.
Further, referring to fig. 1, the pins S21 and S22 of the safety relay MS are grounded, respectively, and the pins 13, 23 and A1 of the safety relay MS are connected to a power supply unit, respectively.
In the embodiment, by grounding the pin S21 and the pin S22 of the safety relay MS, certain two or more points in the safety chain loop can be prevented from being connected to the ground due to special conditions, and the safety limit switch between the two or more points is bypassed by virtue of the conductive characteristic of the ground, so that the safety protection effect is disabled, namely, the stability and the reliability of the safety chain fault diagnosis circuit in operation can be greatly improved by grounding the pin S21 and the pin S22 of the safety relay MS.
In this embodiment, the power supply unit may be a power supply circuit of an escalator, and the power supply unit provides a 24V dc operating voltage for a safety relay.
Further, referring to fig. 1, the triggering unit includes a first contactor CM1 and a second contactor CM2, wherein the coil of the first contactor CM1 is connected with the pin 14 of the safety relay MS, the coil of the second contactor CM2 is connected with the pin 24 of the safety relay MS, the pin 22 of the normally closed contact of the second contactor CM2 is connected with the pin 12 of the safety relay MS, the pin 21 of the normally closed contact of the second contactor CM2 is connected with the pin 21 of the normally closed contact of the first contactor CM1, the pin 21 of the normally closed contact of the first contactor CM1 is connected with the reset unit, and the normally open ends of the first contactor CM1 and the normally open end of the second contactor CM2 are respectively used for connecting the driving motor 1 of the escalator.
Further, referring to fig. 1, the reset unit includes a reset switch SW1, a pin 2 of the reset switch SW1 is connected to a pin 21 of a normally closed contact of the first contactor CM1, and a pin 1 of the reset switch SW1 is connected to a pin S34 of the safety relay MS.
In this embodiment, the pin 13 of the safety relay MS is connected to the pin 14 through a first switch, and the pin 23 and the pin 24 of the safety relay MS are connected through a second switch.
When any safety limit switch is operated, the safety chain loop is switched off, the safety relay switches on the safety output loop to enable the coil of the first contactor CM1 and the coil of the second contactor CM2 to be electrically sucked and control the driving motor 1 to operate, when any safety limit switch is operated, the safety relay MS switches off the power supply of the coil of the first contactor CM1 and the coil of the second contactor CM2 immediately, namely, the power supply loop of the driving motor 1 of the escalator is cut off, the escalator stops operating immediately, the safety of personnel and equipment is ensured, the fault reset button SW1 of the safety relay MS is connected with the normally closed end of the first contactor CM1 and the normally closed end of the second contactor CM2 in series, namely, the fault reset button SW1 is pressed to reset the safety relay MS effectively only when the first contactor CM1 and the second contactor CM2 are powered off, namely, the driving motor 1 is stopped, and the driving motor 1 can be restored to the operating state.
Further, referring to fig. 2, the second normally closed contact group 21-22 of the safety limit switch is connected with the signal acquisition unit 2, the safety limit switch includes N, where N is greater than or equal to 3 and is an integer, the pin X of the signal acquisition unit 2 includes N, the other ends of the N second normally closed contact groups of the safety limit switch are respectively and correspondingly connected with the N pins X of the signal acquisition unit 2, and the 485 pin of the signal acquisition unit 2 is used for connecting with the control system 3 of the escalator.
In this embodiment, the safety limit switch includes S1, S2. The signal acquisition unit 2 includes a pin X1, a pin X2.. The other end of the second normally closed contact group of the safety limit switch S1 is connected with a pin X1 of the signal acquisition unit 2, the other end of the second normally closed contact group of the safety limit switch S2 is connected with a pin X2 of the signal acquisition unit 2, and the other end of the second normally closed contact group of the safety limit switch Sn is connected with a pin Xn of the signal acquisition unit 2.
In this embodiment, a 485 pin of the signal acquisition unit 2 is used to connect with a control system 3 of an escalator, the state of each safety limit switch in the safety chain loop is transmitted to the control system 3 of the escalator in 485 communication mode, the control system 3 controls the escalator to cut off the control power supply of the power supply circuit of the driving motor 1 in a fault state in software mode, the escalator stops running immediately, and outputs fault information to a fault display screen so as to diagnose a specific fault occurrence point in the safety chain loop, further, heartbeat detection diagnosis with 1 second as a period is adopted between the control system 3 of the escalator and the signal acquisition unit 2, namely, the control system 3 of the escalator transmits a pulse signal to the signal acquisition unit 2 every second, if the control system 3 does not receive a response signal of the signal acquisition unit 2 within 1 second, the control system 3 of the escalator determines that the signal acquisition unit 2 and the control system 3 of the escalator have interrupted communication, the escalator stops and displays a communication interrupt fault code so as to inform a maintenance person to process and solve the problem so as to prevent the diagnosis function failure of the specific fault point of the safety chain.
Further, referring to fig. 1, the safety chain circuit fault diagnosis circuit further includes a fuse FUO, and the first normally closed contact sets of the safety limit switches, the pin S11 of the safety relay MS, the pin S12 of the safety relay MS, and the fuse FUO are connected in series.
In this embodiment, by adding the fuse FUO to the safety chain circuit, the fuse functions as a protection circuit, and when the current exceeds the preset rated value, the fuse generates heat to melt the melt, so as to break the circuit, prevent overload or short circuit of the circuit, and avoid damage to equipment or fire.
The application also correspondingly provides a PCB board on which the safety chain loop fault diagnosis circuit is printed.
The application also correspondingly provides a safety chain loop fault diagnosis system which comprises a fault detection device, a control system 3 and a driving motor 1, wherein the fault detection device adopts the safety chain loop fault diagnosis circuit to realize working control, the normally open end of the fault detection device is connected with the driving motor 1, and the digital signal end of the fault detection device is connected with the control system 3.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.
Claims (8)
1. The safety chain loop fault diagnosis circuit is characterized by comprising a safety relay MS, a trigger unit, a reset unit, a signal acquisition unit and a plurality of safety limit switches, wherein the safety limit switches comprise a first normally closed contact set and a second normally closed contact set, the first normally closed contact sets of the safety limit switches, a pin S11 of the safety relay MS and a pin S12 of the safety relay MS are connected in series, the normally closed ends of the trigger unit are respectively connected with the pin S12 of the safety relay MS and one end of the reset unit, the other end of the reset unit is connected with a pin S34 of the safety relay MS, the coil ends of the trigger unit are respectively connected with a pin 14 and a pin 24 of the safety relay MS, the normally open ends of the trigger unit are used for being connected with a driving motor of an escalator, one end of the second normally closed contact sets of the safety limit switches are respectively connected with a pin X of the signal acquisition unit, and the other ends of the second normally closed contact sets of the safety limit switches are respectively connected with a pin X of the signal acquisition unit.
2. The safety chain circuit fault diagnosis circuit according to claim 1, wherein the pins S21 and S22 of the safety relay MS are grounded, respectively, and the pins 13, 23 and A1 of the safety relay MS are connected to a power supply unit, respectively.
3. The safety chain circuit fault diagnosis circuit according to claim 2, wherein the trigger unit comprises a first contactor CM1 and a second contactor CM2, the coil of the first contactor CM1 is connected with the pin 14 of the safety relay MS, the coil of the second contactor CM2 is connected with the pin 24 of the safety relay MS, the pin 22 of the normally closed contact of the second contactor CM2 is connected with the pin 12 of the safety relay MS, the pin 21 of the normally closed contact of the second contactor CM2 is connected with the pin 21 of the normally closed contact of the first contactor CM1, the pin 21 of the normally closed contact of the first contactor CM1 is connected with the reset unit, and the normally open ends of the first contactor CM1 and the normally open end of the second contactor CM2 are respectively used for connecting a driving motor of an escalator.
4. A safety chain loop fault diagnosis circuit according to claim 3, wherein the reset unit comprises a reset switch SW1, pin 2 of the reset switch SW1 is connected to pin 21 of the normally closed contact of the first contactor CM1, and pin 1 of the reset switch SW1 is connected to pin S34 of the safety relay MS.
5. The safety chain loop fault diagnosis circuit according to claim 1, wherein the safety limit switch comprises N, N is greater than or equal to 3 and is an integer, the pins X of the signal acquisition unit comprise N, the other ends of the second normally closed contact groups of the N safety limit switches are respectively and correspondingly connected with the N pins X of the signal acquisition unit, and 485 pins of the signal acquisition unit are used for being connected with a control system of an escalator.
6. The safety chain circuit fault diagnosis circuit according to claim 1, further comprising a fuse FUO, wherein a plurality of the first normally closed contact groups of the safety limit switch, the pin S11 of the safety relay MS, the pin S12 of the safety relay MS, and the fuse FUO are connected in series.
7. A PCB board on which the safety chain circuit fault diagnosis circuit according to any one of claims 1 to 6 is printed.
8. The safety chain loop fault diagnosis system is characterized by comprising a fault detection device, a control system and a driving motor, wherein the fault detection device adopts the safety chain loop fault diagnosis circuit according to any one of claims 1-6 to realize working control, a normally open end of the fault detection device is connected with the driving motor, and a digital signal end of the fault detection device is connected with the control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420495207.XU CN222498313U (en) | 2024-03-13 | 2024-03-13 | Safety chain circuit fault diagnosis circuit, PCB and diagnosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420495207.XU CN222498313U (en) | 2024-03-13 | 2024-03-13 | Safety chain circuit fault diagnosis circuit, PCB and diagnosis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222498313U true CN222498313U (en) | 2025-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420495207.XU Active CN222498313U (en) | 2024-03-13 | 2024-03-13 | Safety chain circuit fault diagnosis circuit, PCB and diagnosis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222498313U (en) |
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- 2024-03-13 CN CN202420495207.XU patent/CN222498313U/en active Active
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