An automatic control DC 24V grounding monitoring and alarm device

Abstract

This invention provides an automatic control DC 24V ground fault monitoring and alarm device, including a detection circuit. The detection circuit includes a first relay and a second relay connected in series. The first relay is connected to the positive terminal of the power supply, and the second relay is connected to the negative terminal of the power supply. A first indicator light and a second indicator light are connected in parallel in the detection circuit. The first indicator light is connected in series with a first switch a, and the second indicator light is connected in series with a second switch a. This device operates based on voltage changes during a ground fault, causing the relays to activate, thereby enabling real-time detection and alarm for the ground fault. It can also provide different prompts for different fault conditions. Using relay connections, it eliminates the need for chips and other components, making it suitable for high-temperature or acidic environments, and ensuring reliable and stable operation. It has a simple structure and is easy to use.

Description

Technical Field

[0001] This utility model belongs to the field of circuit monitoring technology and relates to an automatic control DC 24V grounding monitoring and alarm device. Background Technology

[0002] In the non-ferrous metal smelting industry, automated linkage equipment has gradually become widespread, replacing frontline personnel in repetitive and physically demanding tasks in harsh working environments. The control circuits of these automated equipment use 24V DC as their power supply. Due to the harsh environment of non-ferrous metal smelting and the numerous moving parts in automated equipment, grounding faults caused by insulation damage are prone to occur. If not detected in time, these faults can lead to malfunctions. However, existing grounding protection devices are mostly designed for AC or high-voltage DC circuits, lacking specificity for the 24V power supply circuits of automated equipment control systems. These devices suffer from problems such as complex structures, numerous electronic components, short lifespan in corrosive environments, and difficulties in maintenance and repair. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the background technology by providing an automatic control DC 24V grounding monitoring and alarm device.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] An automatic control DC 24V grounding monitoring and alarm device includes a detection circuit. The detection circuit includes a first relay and a second relay connected in series. The first relay is connected to the positive terminal of the power supply, and the second relay is connected to the negative terminal of the power supply. The detection circuit has a first indicator light and a second indicator light connected in parallel. The first indicator light is connected in series with a first switch a, and the second indicator light is connected in series with a second switch a.

[0006] Furthermore, the detection circuit has a third relay and a fourth relay connected in parallel. The third relay is connected in series with a first switch b, and the first switch b is connected in parallel with a third switch a. The fourth relay is connected in series with a second switch b, and the second switch b is connected in parallel with a fourth switch a. The detection circuit also has a third indicator light and a fourth indicator light connected in parallel. The third indicator light is connected in series with a third switch b, and the fourth indicator light is connected in series with a fourth switch b.

[0007] Furthermore, the detection circuit is connected in parallel with a buzzer alarm, the buzzer alarm is connected in series with a first switch c, and the first switch c is connected in parallel with a second switch c.

[0008] Furthermore, the detection circuit has a first capacitor and a second capacitor connected in parallel and in series. The first capacitor is connected in series with the first relay and the second relay, and the second capacitor is connected in series with the first relay.

[0009] The beneficial effects of this utility model are as follows: This device activates the relay based on the voltage change during a ground fault, thereby enabling real-time detection and alarm of the ground fault. It can also provide different prompts for different fault conditions. It is constructed using relay connections and does not require chips or other devices, making it suitable for high-temperature or acidic environments, and its operation is reliable and stable. It has a simple structure and is easy to use. Attached Figure Description

[0010] Figure 1 This is the circuit diagram of this utility model;

[0011] In the diagram, 1-detection circuit, 2-positive power supply, 3-negative power supply, 4-first indicator light, 5-second indicator light, 6-third indicator light, 7-fourth indicator light, and 8-buzzer alarm. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings:

[0013] like Figure 1 As shown, an automatic control DC 24V grounding monitoring and alarm device includes a detection circuit 1. The detection circuit includes a first relay KM1 and a second relay KM2 connected in series. The first relay KM1 is connected to the positive terminal 2 of the power supply, and the second relay KM2 is connected to the negative terminal 3 of the power supply. This device is connected to the power supply of the automatic control equipment, realizing parallel connection with the automatic control equipment. The power supply voltage is 24V, and the rated voltage of the first relay KM1 and the second relay KM2 is 24V. When the voltage reaches 70% of the rated voltage of the relays, the first relay KM1 and the second relay KM2 can operate. Since the first relay KM1 and the second relay KM2 are connected in series, the voltage of each of the first relay KM1 and the second relay KM2 is 1V during normal operation of the equipment. At 2 volts, the first relay KM1 and the second relay KM2 are not in operation. When a ground fault occurs in the automatic control equipment circuit due to insulation damage, the voltage of the detection circuit will increase, thereby causing the first relay KM1 and the second relay KM2 to operate. The detection circuit 1 also has a first indicator light 4 and a second indicator light 5 connected in parallel. The first indicator light 4 is connected in series with the first switch aK1a, and the second indicator light 5 is connected in series with the second switch aK2a. When the first relay KM1 operates, it will cause the first switch aK1a to close, thereby causing the first indicator light 4 to light up. When the second relay KM2 operates, it will cause the second switch aK2a to close, thereby causing the second indicator light 5 to light up. The lighting of the first indicator light 4 and the second indicator light 5 can indicate to the on-site operator that a fault has occurred.

[0014] The detection circuit 1 also has a third relay KM3 and a fourth relay KM4 connected in parallel. The third relay is connected in series with a first switch bK1b, and the first switch bK1b is connected in parallel with a third switch aK3a. The fourth relay KM4 is connected in series with a second switch bK2b, and the second switch bK2b is connected in parallel with a fourth switch aK4a. When the first relay KM1 is running, it can also close the first switch bK1b. When the second relay KM2 is running, it can also close the second switch bK2b. The detection circuit 1 also has a third indicator light 6 and a fourth indicator light 7 connected in parallel. The third indicator light 6 is connected in series with a third switch bK3b, and the fourth indicator light 7 is connected in series with a fourth switch bK4b. When the third relay KM3 is running, it can drive the third switches aK3a and bK3b to close. When the fourth relay KM4 is running, it can drive the fourth switches aK4a and bK4b to close.

[0015] The detection circuit 1 is also connected in parallel with a buzzer alarm 8. The buzzer alarm 8 is connected in series with a first switch cK1c. The first switch cK1c is connected in parallel with a second switch cK2c. When the first relay KM1 is running, it can also drive the first switch cK1c to close. When the second relay KM2 is running, it can also drive the second switch cK2c to close. When the first switch cK1c or the second switch cK2c is closed, the buzzer alarm 8 is powered on and alarms are triggered.

[0016] The detection circuit 1 has a first capacitor C1 and a second capacitor C2 connected in parallel and in series. The first capacitor C1 and the second relay KM2 are connected in series, and the second capacitor C2 and the first relay KM1 are connected in series. The first capacitor C1 and the second capacitor C2 can play an anti-interference role, thereby preventing the first relay KM1 and the second relay KM2 from malfunctioning due to power supply voltage fluctuations.

[0017] The operating principle of this utility model is as follows:

[0018] When the insulation layer of the automatic control device's circuit is damaged, exposing the internal wire core, and the exposed wire core temporarily contacts other devices, causing a temporary grounding fault, the voltage at the first relay KM1 and the second relay KM2 will temporarily increase. This causes the first relay KM1 and the second relay KM2 to temporarily operate for a period of time and then stop. At this time, the first relay KM1 drives the first switches aK1a, bK1b, and cK1c to temporarily close for a period of time and then open. Similarly, the second relay KM1 drives the second switches aK2a, bK2b, and cK2c to temporarily close for a period of time and then open. When the first switch aK1a closes, the first indicator light 4 lights up; when the first switch aK1a opens, it goes out. When the second switch aK2a closes, the second indicator light 5 lights up; when the second switch aK2a opens, it goes out. When the first switch bK1b closes, the third relay KM3 is energized and operates. The third switch aK3a and the third switch bK3b are closed. When the third switch aK3a is closed, the third relay KM3 is continuously energized after the first switch bK1b is open. When the third switch bK3b is closed, the third indicator light 6 illuminates. At the same time, when the second switch bK2b is closed, the fourth relay KM4 is energized. The fourth relay KM4 drives the fourth switch aK4a and the third switch bK4b to close. When the fourth switch aK4a is closed, the fourth relay KM4 is continuously energized after the second switch bK2b is open. When the fourth switch bK4b is closed, the fourth indicator light 7 illuminates. That is, when a temporary grounding fault occurs, the first indicator light 4 and the second indicator light 5 flash once, while the third indicator light 6 and the fourth indicator light 7 remain illuminated. Simultaneously, the first relay KM1 and the second relay KM2 drive the first switch cK1c and the second switch cK2c to close, causing the buzzer alarm 8 to temporarily sound an alarm as a warning.

[0019] When the insulation layer of the automatic control device circuit is damaged, the internal wire core is exposed. If the exposed wire core is in contact with other devices for a long time, the voltage at the first relay KM1 and the second relay KM2 will increase, causing the first relay KM1 and the second relay KM2 to run continuously. The first relay KM1 drives the first switch aK1a, the first switch bK1b and the first switch cK1c to close, which in turn causes the first indicator light 4 to light up. The third relay KM3 is energized and runs, and the third indicator light 6 lights up after the third relay KM3. At the same time, the second relay KM2 drives the first switch aK1a, the first switch bK1b and the first switch cK1c to close, which in turn causes the second indicator light 5 to light up. The fourth relay KM4 is energized and runs, and the fourth indicator light 7 lights up after the fourth relay KM4. That is, when a long-term grounding fault occurs, the first indicator light 4, the second indicator light 5, the third indicator light 6 and the fourth indicator light 7 will continue to light up, and the buzzer alarm 8 will sound a buzzer alarm for a long time as a warning.

[0020] This device can detect and alarm grounding faults in real time, and can also provide different prompts for different fault conditions. In addition, this device is constructed with relays and does not have chips or other components, making it suitable for harsh working environments. It can operate stably, and its simple structure and convenient operation make it easy to use.

Claims

1. An automatic control DC 24V grounding monitoring and alarm device, characterized in that, The system includes a detection circuit comprising a first relay and a second relay connected in series. The first relay is connected to the positive terminal of the power supply, and the second relay is connected to the negative terminal of the power supply. The detection circuit also includes a first indicator light and a second indicator light connected in parallel. The first indicator light is connected in series with a first switch a, and the second indicator light is connected in series with a second switch a.

2. The automatic control DC 24V grounding monitoring and alarm device according to claim 1, characterized in that, The detection circuit has a third relay and a fourth relay connected in parallel. The third relay is connected in series with a first switch b, and the first switch b is connected in parallel with a third switch a. The fourth relay is connected in series with a second switch b, and the second switch b is connected in parallel with a fourth switch a. The detection circuit also has a third indicator light and a fourth indicator light connected in parallel. The third indicator light is connected in series with a third switch b, and the fourth indicator light is connected in series with a fourth switch b.

3. The automatic control DC 24V grounding monitoring and alarm device according to claim 1, characterized in that, The detection circuit is connected in parallel with a buzzer alarm, the buzzer alarm is connected in series with a first switch c, and the first switch c is connected in parallel with a second switch c.

4. The automatic control DC 24V grounding monitoring and alarm device according to claim 1, characterized in that, The detection circuit has a first capacitor and a second capacitor connected in parallel and connected in series. The first capacitor and the second relay are connected in series, and the second capacitor and the first relay are connected in series.

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