阅读说明：本技术 一种卸料臂接近开关故障报警电路及卸料臂 (Unloading arm proximity switch fault alarm circuit and unloading arm ) 是由 张希友 贺永利 黄亮 *** 张勇 阚宝义 于 2019-10-22 设计创作，主要内容包括：一种卸料臂接近开关故障报警电路及卸料臂,电路包括：N个接近开关；与N个接近开关一一对应相连的中继器,中继器的输入端与对应的接近开关的输出端相连；与各个中继器的第一输出端和第二输出端相连的PLC系统；与中继器一一对应相连的锁存继电器,锁存继电器的继电器线圈的正极与预设外部电源相连,继电器线圈的负极与中继器的第一输出端相连,锁存继电器的第一动作开关的静触头与中继器的第一输出端相连,锁存继电器的第一动作开关的动触头与中继器的第二输出端相连,第一动作开关为常开开关；PLC系统用于,用于接收中继器转发的、接近开关输出的故障信号,并生成第一报警信号,实现了故障信号的精准快速的定位。(The utility model provides a unload arm proximity switch malfunction alerting circuit and unload arm, the circuit includes: n proximity switches; the input ends of the repeaters are connected with the output ends of the corresponding proximity switches; a PLC system connected to the first output terminal and the second output terminal of each repeater; the latching relays are connected with the repeaters in a one-to-one correspondence mode, the anodes of relay coils of the latching relays are connected with a preset external power supply, the cathodes of the relay coils are connected with the first output end of the repeaters, the fixed contacts of first action switches of the latching relays are connected with the first output end of the repeaters, the moving contacts of the first action switches of the latching relays are connected with the second output end of the repeaters, and the first action switches are normally open switches; the PLC system is used for receiving fault signals which are forwarded by the repeater and output by the proximity switch, generating first alarm signals and achieving accurate and rapid positioning of the fault signals.)

1. The utility model provides a discharge arm proximity switch malfunction alerting circuit, is applied to and unloads the arm, its characterized in that includes:

n proximity switches, wherein N is a positive integer greater than 1;

the input ends of the repeaters are connected with the output ends of the corresponding proximity switches;

the PLC system is connected with the first output end and the second output end of each repeater;

the latching relays are connected with the repeaters in a one-to-one correspondence manner, the anodes of relay coils of the latching relays are connected with a preset external power supply, the cathodes of the relay coils are connected with the first output end of the repeaters, the static contacts of first action switches of the latching relays are connected with the first output end of the repeaters, the moving contacts of the first action switches of the latching relays are connected with the second output end of the repeaters, and the first action switches are normally open switches;

the PLC system is used for receiving the fault signal which is forwarded by the repeater and output by the proximity switch and generating a first alarm signal.

2. The discharge arm proximity switch fault alarm circuit of claim 1, further comprising a DOS system;

and the second action switch of the latching relay is connected with the input end of the DOS system, when the DOS acquires an input signal for representing the closing of the second action switch, the DOS acquires latching relay address information corresponding to the input signal, generates and outputs a second alarm signal matched with the latching relay address information, and the second action switch is a normally open switch.

3. The discharge arm proximity switch malfunction alerting circuit of claim 2, wherein the DOS system is specifically configured to perform the following operations:

collecting the connection state between each group of first input end and second input end of the DOS, wherein each group of first input end and second input end of the DOS are connected with the second action switch of one corresponding latching relay, the first input end of the DOS is connected with one end of the second action switch, and the second input end of the DOS is connected with the other end of the second action switch;

judging whether the DOS has a first input end and a second input end which are conducted or not;

acquiring address information of the conducted first input end and/or second input end;

acquiring address information of a proximity switch or a loop where the proximity switch is located, which is matched with the address information of the first input end and/or the second input end, from a first preset mapping table;

and sending the obtained address information of the proximity switch or the loop where the proximity switch is located to display equipment for displaying.

4. The discharge arm proximity switch fault alarm circuit of claim 3, wherein the DOS system comprises:

a collecting unit for collecting the connection state between the first and second input ends of each group of the DOS system

The judging unit is used for judging whether the DOS has a first input end and a second input end which are conducted or not according to the acquisition result of the acquisition unit, and outputting a trigger signal to the port address acquisition unit when the first input end and the second input end which are conducted exist;

the port address acquisition unit is used for acquiring address information of the conducted first input end and/or second input end;

the fault address analysis unit is used for acquiring address information of the proximity switch or a loop where the proximity switch is located, which is matched with the address information of the first input end and/or the second input end, from the first preset mapping table based on a first preset mapping table;

and the signal output unit is used for sending the obtained address information of the proximity switch or the loop where the proximity switch is positioned to display equipment for displaying.

5. The discharge arm proximity switch fault alarm circuit of claim 1, wherein the relay is specifically a 9170 relay.

6. The discharge arm proximity switch malfunction alerting circuit of claim 1, wherein said latching relay is a dc type latching relay and said external power source is a dc power source.

7. The discharge arm proximity switch malfunction alerting circuit of claim 2, wherein a reset switch is provided on said latching relay.

8. The discharge arm proximity switch malfunction alerting circuit of claim 1, wherein the relay, latching relay, and PLC system are disposed within a control cabinet.

9. A discharge arm equipped with the discharge arm proximity switch malfunction alerting circuit of any one of claims 1-8.

Technical Field

The invention relates to the technical field of electric control equipment, in particular to a fault alarm circuit for a proximity switch of a discharging arm and the discharging arm.

Background

A Liquefied Natural Gas (LNG) discharge arm is a loading and unloading device, and when an LNG ship arrives at an LNG receiving terminal, the LNG ship transfers LNG to a storage tank of the receiving terminal through a liquid-phase discharge arm and a discharge line by means of a ship-mounted discharge pump.

The proximity switch fault is one of faults frequently occurring in the existing discharging arm, and as the discharging arm is provided with a plurality of proximity switch loops and uses one alarm channel, when the loops have fault alarm, the fault loops cannot be accurately determined.

Therefore, how to determine that the proximity switch of the discharging arm outputs the fault signal and accurately locate the fault becomes one of the technical problems to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In view of this, embodiments of the present invention provide a discharge arm proximity switch fault alarm circuit and a discharge arm, so as to achieve fast positioning of a proximity switch and a fault signal output by a loop where the proximity switch is located.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

the utility model provides a discharge arm proximity switch malfunction alerting circuit, is applied to and discharges in the arm, includes:

n proximity switches, wherein N is a positive integer greater than 1;

the input ends of the repeaters are connected with the output ends of the corresponding proximity switches;

the PLC system is connected with the first output end and the second output end of each repeater;

the latching relays are connected with the repeaters in a one-to-one correspondence manner, the anodes of relay coils of the latching relays are connected with a preset external power supply, the cathodes of the relay coils are connected with the first output end of the repeaters, the static contacts of first action switches of the latching relays are connected with the first output end of the repeaters, the moving contacts of the first action switches of the latching relays are connected with the second output end of the repeaters, and the first action switches are normally open switches;

the PLC system is used for receiving the fault signal which is forwarded by the repeater and output by the proximity switch and generating a first alarm signal.

Optionally, the fault alarm circuit for the proximity switch of the discharge arm further comprises a DOS system;

and the second action switch of the latching relay is connected with the input end of the DOS system, when the DOS acquires an input signal for representing the closing of the second action switch, the DOS acquires latching relay address information corresponding to the input signal, generates and outputs a second alarm signal matched with the latching relay address information, and the second action switch is a normally open switch.

Optionally, in the discharge arm proximity switch fault alarm circuit, the DOS system is specifically configured to perform the following operations:

collecting the connection state between each group of first input end and second input end of the DOS, wherein each group of first input end and second input end of the DOS are connected with the second action switch of one corresponding latching relay, the first input end of the DOS is connected with one end of the second action switch, and the second input end of the DOS is connected with the other end of the second action switch;

judging whether the DOS has a first input end and a second input end which are conducted or not;

acquiring address information of the conducted first input end and/or second input end;

acquiring address information of a proximity switch or a loop where the proximity switch is located, which is matched with the address information of the first input end and/or the second input end, from a first preset mapping table;

and sending the obtained address information of the proximity switch or the loop where the proximity switch is located to display equipment for displaying.

Optionally, in the above-mentioned discharge arm proximity switch malfunction alerting circuit, the DOS system includes:

a collecting unit for collecting the connection state between the first and second input ends of each group of the DOS system

The judging unit is used for judging whether the DOS has a first input end and a second input end which are conducted or not according to the acquisition result of the acquisition unit, and outputting a trigger signal to the port address acquisition unit when the first input end and the second input end which are conducted exist;

the port address acquisition unit is used for acquiring address information of the conducted first input end and/or second input end;

the fault address analysis unit is used for acquiring address information of the proximity switch or a loop where the proximity switch is located, which is matched with the address information of the first input end and/or the second input end, from the first preset mapping table based on a first preset mapping table;

and the signal output unit is used for sending the obtained address information of the proximity switch or the loop where the proximity switch is positioned to display equipment for displaying.

Optionally, in the fault alarm circuit for the proximity switch of the discharging arm, the relay is specifically 9170 relay.

Optionally, in the fault alarm circuit for the proximity switch of the discharging arm, the latching relay is a direct-current latching relay, and the external power supply is a direct-current power supply.

Optionally, in the fault alarm circuit for the proximity switch of the discharging arm, the latching relay is provided with a reset switch.

Optionally, in the fault alarm circuit for the proximity switch of the discharging arm, the relay, the latching relay and the PLC system are disposed in the control cabinet.

A discharge arm provided with a fault alarm circuit for a discharge arm proximity switch as described in any one of the above.

Based on the above technical solution, in the above solution provided in the embodiments of the present invention, when the proximity switch outputs an alarm signal or the loop in which the proximity switch is located outputs an alarm signal, the first output terminal and the second output terminal of the relay are turned on under the control of the signal, so that the PLC system is turned on between two ports connected to the first output terminal and the second output terminal of the relay, and when the PLC detects that the two ports are turned on, the PLC generates and outputs the alarm signal, and meanwhile, because the positive electrode of the relay coil of the latching relay is connected to the positive electrode of the external power supply, the negative electrode is connected to the first output terminal of the relay, and the static contact of the first action switch of the latching relay is connected to the first output terminal of the relay, and the moving contact of the first action switch of the latching relay is connected to the second output terminal of the relay, when the first output end and the second output end of the repeater are conducted, the current of the external power supply can flow through the relay coil of the latching relay to generate an induction magnetic field, the first action switch of the latching relay is closed and kept in a closed state under the action of the induction magnetic field, when the proximity switch outputs an alarm signal or the alarm signal output by a loop where the proximity switch is located disappears, the two ports connected with the first output end and the second output end of the repeater are disconnected, at the moment, because the first action switch of the latching relay is still kept in the closed state, and the static contact of the first action switch of the latching relay is connected with the first output end of the repeater, the moving contact of the first action switch of the latching relay is connected with the second output end of the repeater, therefore, under the action of the first action switch of the latching relay, the two ports corresponding to the PLC system are kept in a conducting state, so that the PLC system can realize continuous alarm, and because the conducting condition can not occur between the two output ports of other relays, coils of other latching relays have no current flow, correspondingly, first action switches in the latching relays can not be closed, therefore, the alarm signal output by the loop where the approach switch or the approach switch is located can be accurately judged by searching the switching state of the first action switch of each latching relay, and the accurate and quick positioning of the fault signal is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a circuit structure diagram of a fault alarm circuit of a proximity switch of a discharging arm according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an equivalent circuit of a circuit structure of a discharging arm proximity switch failure alarm circuit according to an embodiment

Fig. 3 is a schematic structural diagram of a fault alarm circuit for a proximity switch of a discharge arm according to a second embodiment of the present application;

fig. 4 is a circuit structure diagram of a fault alarm circuit of a proximity switch of a discharging arm provided in the third embodiment of the present application;

FIG. 5 is a schematic diagram of a work flow of a DOS system in a fault alarm circuit of a proximity switch of a discharge arm disclosed in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a DOS system disclosed in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.