Multi-path protection switch alarm system

Abstract

The invention relates to the technical field of current detection, in particular to a multipath protection switch alarm system. The protection circuit is connected in series with a 220V loop and outputs a protection signal to the MCC control end according to the action of a protection switch; the auxiliary control circuit is connected to the protection circuit end in parallel, releases energy according to the action of a relay in the protection circuit and provides a current path; and the alarm circuit is connected to the protection circuit end in parallel, is electrified according to the action of the protection switch and is connected with the auxiliary control circuit to realize sound-light alarm. According to the invention, the fault position is accurately positioned, the defect elimination efficiency is obviously improved, the real-time sound-light alarm function is realized, the quick response of an operator is facilitated, and the relay can be quickly and reliably released; meanwhile, a current path is provided for the electronic alarm device, no cable needs to be newly added, the system structure is simplified, stable work of the circuit in a high-voltage environment can be ensured, false alarm and element damage are avoided, and the reliability and the service life of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of line protection, in particular to a multi-way protection switch alarm system. Background Art

[0002] Multiple protection switches in series are widely used in pull-cord protection circuits for equipment such as long-distance conveyor belts. Multiple protection switches (e.g., protection switch 1, protection switch 2, etc.) are connected in series in a 220V AC circuit to drive a relay. When one of the protection switches activates, the relay loses power, causing its auxiliary contacts to step, outputting a protection signal to the MCC circuit. While this design meets basic protection requirements, it presents some significant challenges in practical applications.

[0003] In long-distance, multi-device scenarios, fault location efficiency is extremely low, seriously affecting production safety and equipment maintenance efficiency; existing technologies only rely on the contact signal of the relay to transmit protection information and cannot provide intuitive sound and light alarms, making it difficult for operators to detect and handle faults in a timely manner, increasing safety hazards. In the AC 220V circuit, the relay will generate self-excitation magnetism when it is released due to power failure, which may cause the relay to fail to release normally, affecting the accurate output of the protection signal.

[0004] Therefore, a multi-way protection switch alarm system that can provide real-time sound and light alarms to accurately locate faults, improve circuit design, and assist relay energy release is needed to meet the needs of the existing environment. Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0006] In view of the above-mentioned existing technologies, traditional equipment has extremely low fault location efficiency, cannot provide intuitive sound and light alarms, and the relay may not be able to release energy normally.

[0007] Therefore, the technical problem to be solved by the present invention is to design a multi-way protection switch alarm system that can accurately locate faults with real-time sound and light alarms, improve circuit design, and assist relays in releasing energy to meet the needs of the existing environment.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-way protection switch alarm system, comprising:

[0009] The protection circuit is connected in series to the 220V circuit and outputs a protection signal to the MCC control terminal according to the action of the protection switch;

[0010] The auxiliary control circuit is connected in parallel to the protection circuit end, and releases energy according to the action of the relay in the protection circuit to provide a current path;

[0011] The alarm circuit is connected in parallel to the protection circuit end. According to the action of the protection switch, it is energized and connected to the auxiliary control circuit to realize the sound and light alarm.

[0012] As an improvement of the present invention,

[0013] The protection circuit includes a protection switch assembly and a relay, wherein the protection switch assembly is coupled in series with multiple protection switches;

[0014] One end of the protection switch assembly is connected to the AC220V voltage source, and the other end is connected to the relay;

[0015] The relay is connected to the MCC control terminal.

[0016] As an improvement of the present invention,

[0017] The auxiliary control circuit is provided with an auxiliary coupling terminal, and the auxiliary coupling terminal is connected to both sides of the relay;

[0018] A voltage-dropping resistor element is provided in the auxiliary control circuit. One end of the voltage-dropping resistor element is connected to the auxiliary coupling terminal, and the other end is connected to the auxiliary warning element.

[0019] As an improvement of the present invention,

[0020] The alarm circuit includes a step-down safety module and a rectifier transmission module;

[0021] An alarm coupling terminal is provided in the step-down safety module, and the alarm coupling terminal is connected to both sides of the protection switch;

[0022] The other end of the alarm coupling terminal is connected to a RC voltage drop component and a transient voltage processing component respectively.

[0023] As an improvement of the present invention,

[0024] The step-down safety module and the rectifier transmission module are connected via a bridge rectifier element;

[0025] The output ends of the RC voltage-dropping element and the transient voltage processing element are connected to the bridge rectifier element.

[0026] As an improvement of the present invention,

[0027] The rectifier transmission module is equipped with a parallel bridge rectifier element, a filter element, a voltage stabilizing element and a resistor-capacitor coupling element;

[0028] The output end of the resistor-capacitor coupling element is connected to the sound alarm element.

[0029] As an improvement of the present invention,

[0030] The first light alarm element and the second light alarm element are arranged in the rectifier transmission module.

[0031] The first light alarm element and the second light alarm element are respectively connected with the blocking and capacitive coupling element and the sound alarm element.

[0032] As an improvement of the present application,

[0033] The auxiliary warning element, the first light alarm element and the second light alarm element are redundantly arranged.

[0034] The auxiliary warning element is connected with the capacitive element in parallel.

[0035] The present application has the advantages of accurate positioning of fault position, significant improvement of defect elimination efficiency, realization of instant sound and light alarm function, convenience for operators to quickly respond, ensuring that the relay can be quickly and reliably released, providing a current path for the electronic alarm device, without the need to add new cables, simplifying the system structure, ensuring stable operation of the circuit in a high-voltage environment, avoiding false alarms and component damage, and improving the reliability and service life of the system. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0037] Fig. 1 It is the architecture planning diagram of the multi-way protection switch alarm system in the present application.

[0038] Fig. 2 It is the original architecture diagram of the multi-way protection switch alarm system in the present application.

[0039] Fig. 3 It is the internal planning diagram of the alarm circuit of the multi-way protection switch alarm system in the present application.

[0040] Fig. 4 It is the internal planning diagram of the auxiliary control circuit of the multi-way protection switch alarm system in the present application. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0042] Embodiment 1

[0043] Reference Figs. 1-2, this embodiment provides a multi-way protection switch alarm system.

[0044] Protection circuit 1 is used to trigger the protection signal of the series protection switch. When any protection switch is activated (such as the switch is triggered), the entire protection circuit is disconnected, causing the relay to lose power, thereby outputting the protection signal to the MCC (Motor Control Center) to stop the equipment operation.

[0045] Protection circuit 1 consists of multiple protection switches and a relay at one end. These components are coupled in series. The relay outputs a corresponding protection signal to the MCC control terminal based on the operation of any protection switch. When all protection switches are closed, 220V current flows through the relay, closing its normally open contacts and allowing the equipment to operate normally. When any protection switch is opened, the entire series circuit loses power, causing the relay to release, reset its normally closed contacts, and send a shutdown signal to the MCC.

[0046] The auxiliary control circuit 2 is used to cooperate with the relay to release energy and provide a current path. When the relay is powered off, the auxiliary control circuit 2 can quickly release the self-induced electromotive force of the relay coil to prevent the relay from being "stuck" and unable to release normally. Subsequently, it provides a current path for the alarm circuit 3 to ensure that the alarm function is triggered normally.

[0047] Auxiliary control circuit 2 is equipped with a corresponding RC energy release circuit and an LED light. Under normal conditions, the 220V voltage closes the relay switch, and the LED lights up to indicate that the relay is working properly. Under fault conditions, the relay loses power and the coil generates a reverse electromotive force. At this time, the RC energy release circuit absorbs energy, preventing the relay from being unable to release.

[0048] Alarm circuit 3 provides audible and visual alarms, pinpointing the fault location. When a specific protection switch operates, the corresponding alarm circuit is energized, generating both an audible (buzzer) and visual (LED) alarm, directly notifying the operator of the fault location. Each protection switch is connected in parallel with an independent alarm module. When the protection switch is closed, the alarm circuit is deactivated. When a protection switch is open, 220V voltage is applied to the corresponding alarm circuit, where it is stepped down, rectified, and filtered before driving the LED and buzzer to generate an alarm.

[0049] This embodiment details how the protection circuit 1, auxiliary control circuit 2, and alarm circuit 3 work together to achieve precise fault location and rapid alarm. Compared to traditional solutions, this invention is particularly suitable for long-distance, multi-switch industrial scenarios (such as coal mine belt conveyors and power plant conveyor belts), significantly improving safety and maintenance efficiency.

[0050] Example 2

[0051] Reference Figs. 1-4This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0052] The protection circuit 1 includes a protection switch assembly 11 and a relay 12. The alarm circuit 3 is connected in parallel with each protection switch in the protection switch assembly 11 to monitor the corresponding operating condition of each protection switch. The auxiliary control circuit 2 is connected in parallel with the relay 12 to coordinate the operation of the relay 12 and provide a current path for the alarm circuit 3, ensuring the alarm function is properly triggered.

[0053] One end of the protection switch assembly 11 is connected to the AC220V voltage source, and the other end is connected in series with the relay 12. Terminals 1 and 4 of the relay 12 are responsible for circuit access respectively. When any protection switch is triggered, the coil of the relay 12 loses its magnetism and releases, and the contacts are reset through terminals 2 and 3, sending a protection signal into the MCC control circuit.

[0054] Auxiliary coupling terminal 21 within auxiliary control circuit 2 connects both sides of relay 12. A voltage-dropping resistor 22 is also included within auxiliary control circuit 2. This resistor is responsible for stepping down the 220V AC loop voltage. In this embodiment, a 240kΩ resistor is used. One end of resistor 22 is connected to auxiliary coupling terminal 21, and the other end is connected to auxiliary warning element 23.

[0055] Auxiliary warning element 23 can be equipped with an LED light of a corresponding color. When relay 12 is energized and magnetized, auxiliary warning element 23 illuminates, making it easier for staff to identify. When the protection switch is activated and relay 12 loses power and demagnetizes, auxiliary control circuit 2 immediately eliminates the self-excitation magnetization of relay 12, and auxiliary warning element 23 controls the LED light to turn off, while providing a current path for alarm circuit 3.

[0056] A capacitor element 231 is provided in parallel on one side of the auxiliary warning element 23 . The capacitor element 231 is a 1 uf CBB non-polarized capacitor. In an AC circuit, a 1 uf capacitor can carry an alternating current of approximately 69 mA.

[0057] The alarm circuit 3 is composed of a step-down safety module 31 and a rectifier transmission module 32. The step-down safety module 31 is responsible for the safe operation of the alarm circuit 3. An alarm coupling terminal 311 is set in the step-down safety module 31, and the two ends of the alarm coupling terminal 311 are connected in parallel to the two sides of the protection switch.

[0058] The other end of the alarm coupling terminal 311 is connected to a resistance-capacitance voltage reduction element 312 and a transient voltage processing element 313, respectively. The resistance-capacitance voltage reduction element 312 is responsible for reducing the AC 220V loop voltage. The internal C1 and R1 component data are 220nf 450V CBB capacitor and 523kΩ, respectively.

[0059] The transient voltage processing element 313 is composed of a bidirectional diode and a TVS transient suppression diode, which plays an effective transient protection role, improves the working voltage of the entire alarm loop, protects the loop from the low-voltage induction area, and prevents false alarms.

[0060] The voltage reduction safety module 31 and the rectification transmission module 32 are connected through a bridge rectifier element 321, which ensures that the input voltage of the bridge rectifier element 321 is reduced to 10-12V after resistance-capacitance reduction. The bridge rectifier element 321 selects KBP310, with a maximum repetitive peak reverse voltage (VRRM) of 1000V, a maximum RMS bridge input voltage (VRMS) of 700V, a maximum DC blocking voltage (VDC) of 1000V, and a maximum average forward rectification output current (IF(AV)) of 3A at TA=50℃.

[0061] The bridge rectifier element 321 in the rectification transmission module 32 is connected in parallel, and is provided with a filter element 322, a voltage stabilizing element 323, and a resistance-capacitance coupling element 324. The filter element 322 selects a 100uf 50v electrolytic capacitor, the voltage stabilizing element 323 selects SM15T39AY, and the C3 and R2 in the resistance-capacitance coupling element 324 form a high-frequency coupling.

[0062] The output end of the resistance-capacitance coupling element 324 is connected to a sound alarm element 33, which can use a buzzer alarm. The rectification transmission module 32 is also provided with a first light alarm element 35 and a second light alarm element 36, which ensures that the LED and buzzer are triggered when the protection switch is disconnected, and sound and light alarms are given to remind personnel to handle immediately. The color settings of the first light alarm element 35 and the second light alarm element 36 are distinguished, which is convenient for workers to distinguish the working conditions on site.

[0063] The auxiliary warning element 23, the first light alarm element 35, and the second light alarm element 36 are all redundantly set to prevent the above elements from not working properly in unexpected situations and causing greater safety accidents.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multi-way protection switch alarm system, characterized by: include, The protection circuit (1) is connected in series to the 220V loop and outputs a protection signal to the MCC control terminal; The auxiliary control circuit (2) is connected in parallel to the protection circuit (1) and provides a current path according to the energy release of the relay in the protection circuit (1); The alarm circuit (3) is connected in parallel to the end of the protection circuit (1), and is energized and connected to the auxiliary control circuit (2) according to the action of the protection switch to realize the sound and light alarm.

2. The multi-way protection switch alarm system according to claim 1, characterized in that: The protection circuit (1) includes a protection switch assembly (11) and a relay (12), wherein the protection switch assembly (11) is connected in series and coupled with multiple protection switches; One end of the protection switch assembly (11) is connected to an AC220V voltage source, and the other end is connected to a relay (12); Relay (12) is connected to the MCC control terminal.

3. The multi-way protection switch alarm system according to claim 1, characterized in that: The auxiliary control circuit (2) is provided with an auxiliary coupling terminal (21), and the auxiliary coupling terminal (21) is connected to both sides of the relay (12); A voltage-dropping resistor element (22) is provided in the auxiliary control circuit (2), one end of the voltage-dropping resistor element (22) is connected to the auxiliary coupling terminal (21), and the other end is connected to the auxiliary warning element (23).

4. The multi-way protection switch alarm system according to claim 1, characterized in that: The alarm circuit (3) includes a voltage reduction safety module (31) and a rectification transmission module (32); An alarm coupling terminal (311) is provided in the step-down safety module (31), and the alarm coupling terminal (311) is connected to both sides of the protection switch; The other end of the alarm coupling terminal (311) is respectively connected to the RC voltage drop element (312) and the transient voltage processing element (313).

5. The multi-way protection switch alarm system according to any one of claims 1 to 4, characterized in that: The voltage reduction safety module (31) and the rectification transmission module (32) are connected via a bridge rectifier element (321); The output ends of the RC voltage-dropping element (312) and the transient voltage processing element (313) are connected to the bridge rectifier element (321).

6. The multi-way protection switch alarm system according to claim 5, characterized in that: A bridge rectifier element (321) is connected in parallel in the rectifier transmission module (32) and is provided with a filter element (322), a voltage stabilizing element (323) and a resistance-capacitance coupling element (324); The output end of the resistance-capacitance coupling element (324) is connected to the sound alarm element (33).

7. The multi-way protection switch alarm system according to claim 6, characterized in that: A first light alarm element (35) and a second light alarm element (36) are provided in the rectification transmission module (32); Two ends of the first light alarm element (35) and the second light alarm element (36) are connected to a resistance-capacitance coupling element (324) and a sound alarm element (33) respectively.

8. The multi-way protection switch alarm system according to claim 7, characterized in that: The auxiliary warning element (23), the first light warning element (35) and the second light warning element (36) are redundantly arranged; A capacitor element (231) is provided in parallel on one side of the auxiliary warning element (23).

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