Emergency turn-off system

Abstract

The utility model relates to the technical field of mechanical maintenance, in particular to an emergency turn-off system. An emergency turn-off system comprises a manual alarm station and a central control system, and the manual alarm station and the central control system are connected through network signals. The manual alarm station comprises a button contact S1 used for manual alarm, a first wiring terminal 1, a second wiring terminal 2 and a monitoring module. The monitoring module comprises a first resistor R1; the first resistor R1 is connected in parallel with the button contact S1; the first wiring terminal 1 and the second wiring terminal 2 are respectively connected with the button contact S1 and the first resistor R1; when the button contact S1 is in an off state, current flows into the second wiring terminal 2 from the first wiring segment through the first resistor R1; the central control system obtains the value of current flowing through the manual alarm station to detect the connection state. According to the utility model, the state monitoring of the manual alarm station is realized by detecting the current change of the loop and judging the current threshold value of the loop by using the central control system. Therefore, the safety and the stability of the manual alarm station are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical maintenance, in particular to an emergency shutdown system. Background Art

[0002] The PY4-2A platform's ESD system (Emergency Shutdown System) utilizes Hollysys' HiaGuard SIS system. As a key component of the ESD system, the ESD manual alarm station plays an indispensable role in ensuring safe production. When an emergency occurs, on-site workers can manually activate the ESD manual alarm station, triggering an emergency shutdown signal and immediately shutting down production. Various safety protection devices are immediately activated to ensure safe production operations.

[0003] However, the button contacts of the ESD manual alarm station are not equipped with relevant monitoring modules. When the ESD manual alarm station fails, an erroneous alarm signal may be generated, for example:

[0004] If an open circuit fault occurs in the ESD manual alarm station circuit, a shutdown signal will be issued. For example, if the fuse terminal of the ESD manual alarm station circuit is accidentally disconnected, a shutdown signal will be triggered. The operating status of the ESD manual alarm station circuit cannot be determined, and it cannot determine whether there is a poor contact between the button contacts or wiring. If a short circuit occurs in the ESD manual alarm station circuit, the ESD manual alarm station will fail to function, and it cannot determine whether it is in a short circuit state in real time. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an emergency shutdown system.

[0006] The technical solution adopted by the utility model to solve the technical problem is: an emergency shutdown system, including a manual alarm station and a central control system, wherein the manual alarm station and the central control system are connected via a signal line and / or a network signal; the manual alarm station includes a button contact S1 for manual alarm, a first wiring terminal 1 and a second wiring terminal 2; the manual alarm station also includes: a monitoring module for changing the current value flowing through the manual alarm station according to the connection status of the manual alarm station, the monitoring module including a first resistor R1;

[0007] The first resistor R1 is connected in parallel with the button contact S1; the first resistor R1 is connected to the first wiring terminal 1 and the second wiring terminal 2; the button contact S1 is connected to the first wiring terminal 1 and the second wiring terminal 2;

[0008] When the button contact S1 is in the disconnected state, current flows from the first wiring segment through the first resistor R1 into the second wiring terminal 2;

[0009] The central control system acquires the electrical signal flowing through the manual alarm station to detect its connection status.

[0010] Preferably, the monitoring module further includes a second resistor R2 and a third terminal 3;

[0011] The second resistor R2 is connected in parallel with the first resistor R1 and in series with the button contact S1; the second resistor R2 is located between the second terminal 2 and the third terminal 3 and is connected in series with the second terminal 2 and the third terminal.

[0012] Preferably, the monitoring module further includes a fourth terminal 4 and a third resistor R3;

[0013] One end of the third resistor R3 is connected in series with the fourth terminal 4 ; the other end of the third resistor R3 is connected in series with the first terminal 1 .

[0014] Preferably, the first resistor R1 is larger than the second resistor R2 and the third resistor R3; and the third resistor R3 is larger than the second resistor R2.

[0015] Preferably, the central control system includes an analog input card for sending and receiving analog signals;

[0016] The analog input card is connected to the third wiring terminal 3 and the fourth wiring terminal 4 through the signal line.

[0017] Preferably, the central control system further includes an alarm module; the alarm module generates an alarm according to the alarm instruction issued by the central control system;

[0018] The alarm module includes an LED light and a voice control unit.

[0019] Preferably, the central control system includes a signal conversion module for converting signals between the analog input card and the alarm module; the signal conversion module is connected to the analog input card.

[0020] Preferably, the central control system further comprises a judgment module for judging whether the received signal of the analog input card signal or the output signal of the signal conversion module meets preset requirements;

[0021] The judgment module is connected to the signal conversion module; the judgment module is also used to send the alarm instruction to the alarm module.

[0022] Preferably, the judgment module is further configured to judge the working states of the first resistor R1 , the second resistor R2 and the third resistor R3 according to the received signal or the output signal.

[0023] Preferably, the central control system also includes a display module for displaying alarm reminders.

[0024] The implementation of this utility model has the following beneficial effects:

[0025] This utility model monitors the status of the manual alarm station by detecting changes in the loop current and using the central control system to judge the loop's electrical signal, thereby avoiding false triggering of the shutdown signal and improving the safety and stability of the manual alarm station. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of the wiring circuit of the manual alarm station in the first embodiment;

[0028] Figure 2 This is a schematic diagram of the wiring circuit of the manual alarm station in the second embodiment;

[0029] Figure 3 This is a schematic diagram of the wiring circuit of the manual alarm station in the third embodiment. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0031] When a component is referred to as being “fixed to” or “disposed on” another component, it may be directly or indirectly located on the other component. When a component is referred to as being “connected to” another component, it may be directly or indirectly connected to the other component.

[0032] The terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features. "Multiple" means two or more, unless otherwise expressly specified.

[0033] The above terms are only for the convenience of description and should not be understood as limiting the present technical solution.

[0034] The embodiment of the present utility model provides an emergency shutdown system. Figure 1 As shown, the emergency shutdown system includes a manual alarm station and a central control system, connected via signal lines and / or network signals. The manual alarm station includes a push button contact S1 for manual alarm, a first terminal 1, and a second terminal 2. The manual alarm station also includes a monitoring module that changes the current flowing through the manual alarm station based on its connection status. The monitoring module includes a first resistor R1.

[0035] Specifically, the button contact S1, the first wiring terminal 1 and the second wiring terminal 2 of the manual alarm station can realize the manual alarm function, and are connected to the central control system through the wiring terminals.

[0036] The first resistor R1 is connected in parallel with the button contact S1. The first resistor R1 is connected to the first wiring terminal 1 and the second wiring terminal 2. The button contact S1 is connected to the first wiring terminal 1 and the second wiring terminal 2.

[0037] The first resistor R1 connected in parallel can be used for line detection, that is, to check whether the line has any faults. If the manual alarm station is disconnected or short-circuited, a fault will be reported, thereby facilitating fault detection and maintenance.

[0038] When the button contact S1 is open, current flows from the first wiring segment through the first resistor R1 to the second wiring terminal 2. When the button contact S1 is closed, current flows from the first wiring segment through the button contact S1 to the second wiring terminal 2.

[0039] Furthermore, among passive feedback signals, a normally open signal is common. Without the first resistor R1, the normally open signal is normally fed back. If the line in the manual alarm station breaks, the central control system will see the same status, unable to distinguish whether the line is broken or not. With the addition of the first resistor R1, the current values ​​differ in different states, indicating different states and thus detecting line break faults. This ensures that the manual alarm button is functioning properly when it is truly needed, preventing alarm failures in emergencies due to line problems.

[0040] The central control system obtains the current value flowing through the manual alarm station to detect its connection status.

[0041] Due to the presence of the first resistor R1, the system can distinguish between the normal state and the fault state of the line, avoid false alarms caused by line problems, and improve the accuracy and reliability of the system.

[0042] This embodiment connects a first resistor R1 in parallel with the manual alarm button contact S1. This ensures that the signals at the first and second terminals 1 and 2 reflect different current changes when the manual alarm circuit is abnormal or normal. The central control system detects changes in the loop current and determines the loop's electrical signal, thereby monitoring the status of the manual alarm station. This improves the safety and stability of the manual alarm station.

[0043] like Figure 2 As shown, in one executable embodiment, the manual alarm station further includes a second resistor R2 and a third terminal 3 .

[0044] The second resistor R2 is connected in parallel with the first resistor R1 and in series with the button contact S1. The second resistor R2 is connected between the second terminal 2 and the third terminal 3 and in series with the second terminal 2 and the third terminal 3.

[0045] The second resistor R2 is primarily used for line detection, specifically to detect faults in the manual alarm station's wiring. When the electrical signal (current value) across the first and second terminals 1 and 2 exceeds a preset maximum signal, it indicates a short circuit across the manual alarm station. The addition of a second resistor R2, connected in parallel with the first resistor R1 and in series with the pushbutton contact S1, ensures that the electrical signal across the first and second terminals 1 and 2 is less than the preset maximum signal when the pushbutton contact S1 is engaged.

[0046] like Figure 3 As shown, in one executable embodiment, the manual alarm station further includes a fourth terminal 4 and a third resistor R3.

[0047] One end of the third resistor R3 is connected in series with the fourth terminal 4 , and the other end of the third resistor R3 is connected in series with the first terminal 1 .

[0048] The third resistor R3 can be used to adjust the amplitude of the input signal to match the expected input range of the central control system, thereby ensuring that the signal neither exceeds the maximum input voltage of the central control system nor falls below the minimum detection threshold.

[0049] It is understandable that when the button contact S1 of the manual alarm station is disconnected and the manual alarm station is in the alarm state, the current received by the central control system is When the button contact S1 of the manual alarm station is closed and the manual alarm station is in normal state, the current received by the central control system is When the manual alarm station has an abnormal short circuit, the current received by the central control system is less than I1. When the manual alarm station has an abnormal short circuit, the current received by the central control system is greater than I2.

[0050] In the formula, I1 is the current value of the manual alarm station in the alarm state; I2 is the current value of the manual alarm station in the normal state; U is the voltage value at both ends of the manual alarm station; R1 is the resistance value of the first resistor R1; R2 is the resistance value of the first resistor R1; R3 is the resistance value of the first resistor R1.

[0051] In some embodiments, the third resistor R3 can be used for impedance matching to ensure impedance compatibility between the signal at the button contact S1 and the central control system, which helps reduce signal reflection and distortion and improve signal integrity.

[0052] Furthermore, the third resistor R3 can also serve as a protection element to prevent the manual alarm station from being damaged due to excessive input voltage or current. By limiting the amplitude of the input signal, the third resistor R3 helps protect the internal circuit of the manual alarm station.

[0053] In an executable embodiment, the first resistor R1 is larger than the second resistor R2 and the third resistor R3 ; the third resistor R3 is larger than the second resistor R2 .

[0054] Specifically, in this embodiment, when the manual alarm station is in a normal state, the current value of the circuit is greater than the current value of the circuit when the manual alarm station is in an alarm state. When the manual alarm station is in an open circuit abnormality, the current value of the circuit is less than the current value of the circuit when the manual alarm station is in an alarm state. When the manual alarm station is in a short circuit abnormality, the current value of the circuit is greater than the current value of the circuit when the manual alarm station is in a normal state.

[0055] In an executable embodiment, the central control system includes an analog input card for sending and receiving analog signals.

[0056] The analog input card is connected to the third wiring terminal 3 and the fourth wiring terminal 4 through a signal line.

[0057] The analog input card is an interface card used in industrial automation and monitoring systems. It can obtain continuous analog signals from manual alarm stations and convert them into digital signals so that the central control system can process them.

[0058] In an executable embodiment, the central control system further includes an alarm module, which generates an alarm according to an alarm instruction issued by the central control system.

[0059] The alarm module includes LED lights and a voice control unit.

[0060] When the manual alarm station is in normal state, the central control system's manual alarm station logo is gray; when the manual alarm station is in alarm state, the manual alarm station logo is red; when the manual alarm station is in over-range alarm state, that is, short-circuit state, the alarm module changes the color of the manual alarm station logo to yellow; when the manual alarm station is in under-range alarm state, that is, open circuit state, the alarm module changes the color of the manual alarm station logo to yellow. All types of alarms must be confirmed by the central control system before they are activated.

[0061] In an executable embodiment, the central control system includes a signal conversion module for converting signals between the analog input card and the alarm module; the signal conversion module is connected to the analog input card.

[0062] The signal conversion module can provide electrical isolation, protect the lower-level control circuit, weaken the impact of environmental noise on the test circuit, and suppress interference with the equipment from common grounding, inverters, solenoid valves and unknown pulses.

[0063] Taking the ESD2 manual alarm station HS_70101 as an example, the signal conversion module converts the 4-20 mA signal configuration received by the analog input card into a 0-100 engineering quantity.

[0064] In an executable embodiment, the central control system further includes a judgment module for judging whether the received signal of the analog input card signal or the output signal of the signal conversion module meets preset requirements.

[0065] The judgment module is connected to the signal conversion module; the judgment module is also used to send an alarm instruction to the alarm module.

[0066] Specifically, when the engineering quantity value converted from the analog quantity received by the judgment module is lower than the low set point, an alarm is triggered.

[0067] In an executable embodiment, the determination module is further configured to determine the working states of the first resistor R1 , the second resistor R2 , and the third resistor R3 according to the received signal or the output signal.

[0068] The working status of each resistor can be determined based on the level changes of the received signal or the output signal. For example, by detecting the voltage value at the test point after the resistor divides the voltage, it can be inferred whether the resistor is working properly.

[0069] In an executable embodiment, the central control system further includes a display module for displaying alarm reminders. Specifically, various alarms are displayed in the alarm prompt bar, and an alarm needs to be reported through an I / O device.

[0070] In some executable embodiments, the first resistor R1 is a 5 kilo-ohm resistor, the second resistor R2 is a 200 ohm resistor, and the third resistor R3 is a 1 kilo-ohm resistor.

[0071] Under normal circumstances, the contacts of the HS_70101ESD2 manual alarm station are in the closed state. At this time, the HS_70101 engineering quantity value is 68, and the HS_70101 alarm station color is gray;

[0072] Alarm trigger test: When the HS_70101ESD2 manual alarm station is pressed, the button contact S1 changes from a closed state to an open state, generating a manual alarm station trigger alarm, and the alarm station color is red.

[0073] Open circuit alarm test: When the HS_70101 signal line is disconnected, the central control alarm prompts the HS_70101 open circuit alarm, the alarm station color is yellow, and the shutdown alarm is not triggered.

[0074] Short circuit alarm test: Connect a 1 kilo-ohm resistor in parallel to both ends of the HS_70101 signal line. The central control alarm prompts the HS_70101 open circuit alarm. The alarm station color is yellow and the shutdown alarm is not triggered.

[0075] The above embodiments only express the preferred implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An emergency shutdown system, comprising a manual alarm station and a central control system, characterized in that: The manual alarm station and the central control system are connected via a signal line and / or a network signal; the manual alarm station comprises a button contact (S1), a first wiring terminal (1), and a second wiring terminal (2) for manual alarm; the manual alarm station further comprises: a monitoring module for changing the current value flowing through the manual alarm station according to the connection state of the manual alarm station, the monitoring module comprising a first resistor (R1); The first resistor (R1) is connected in parallel with the button contact (S1); the first resistor (R1) is connected to the first wiring terminal (1) and the second wiring terminal (2); the button contact (S1) is connected to the first wiring terminal (1) and the second wiring terminal (2); When the button contact (S1) is in an open state, current flows from the first wiring terminal (1) through the first resistor (R1) into the second wiring terminal (2); The central control system acquires the electrical signal flowing through the manual alarm station to detect its connection status.

2. The emergency shutdown system according to claim 1, characterized in that: The monitoring module further includes a second resistor (R2) and a third wiring terminal (3); The second resistor (R2) is connected in parallel with the first resistor (R1) and in series with the button contact (S1); the second resistor (R2) is located between the second wiring terminal (2) and the third wiring terminal (3), and is connected in series with the second wiring terminal (2) and the third wiring terminal.

3. The emergency shutdown system according to claim 2, characterized in that: The monitoring module further includes a fourth terminal (4) and a third resistor (R3); One end of the third resistor (R3) is connected in series with the fourth wiring terminal (4); the other end of the third resistor (R3) is connected in series with the first wiring terminal (1).

4. The emergency shutdown system according to claim 3, characterized in that: The first resistor (R1) is larger than the second resistor (R2) and the third resistor (R3); the third resistor (R3) is larger than the second resistor (R2).

5. The emergency shutdown system according to claim 4, characterized in that: The central control system includes an analog input card for sending and receiving analog signals; The analog input card is connected to the third wiring terminal (3) and the fourth wiring terminal (4) via the signal line.

6. The emergency shutdown system according to claim 5, characterized in that: The central control system further includes an alarm module; the alarm module generates an alarm according to the alarm instruction issued by the central control system; The alarm module includes an LED light and a voice control unit.

7. The emergency shutdown system according to claim 6, characterized in that: The central control system includes a signal conversion module for converting signals between the analog input card and the alarm module; the signal conversion module is connected to the analog input card.

8. The emergency shutdown system according to claim 7, characterized in that: The central control system further includes a judgment module for judging whether the received signal of the analog input card signal or the output signal of the signal conversion module meets preset requirements; The judgment module is connected to the signal conversion module; the judgment module is also used to send the alarm instruction to the alarm module.

9. The emergency shutdown system according to claim 8, characterized in that: The judgment module is further used to judge the working states of the first resistor (R1), the second resistor (R2) and the third resistor (R3) according to the received signal or the output signal.

10. The emergency shutdown system according to claim 9, characterized in that: The central control system also includes a display module for displaying alarm reminders.

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