Explosion-proof grounding alarm device

Abstract

The utility model discloses an explosion-proof type grounding alarm device comprising an explosion-proof box and a grounding clamp, the explosion-proof box is provided with a power supply interface and an explosion-proof interface, the explosion-proof interface is electrically connected with the grounding clamp, the explosion-proof box is provided with an audible and visual alarm, the audible and visual alarm comprises a buzzer HA and a flash indicating lamp L, and the flash indicating lamp L is electrically connected with the power supply interface. A first electrode P1 and a second electrode P2 are arranged on the grounding clamp; and a circuit board is arranged in the explosion-proof box. According to the explosion-proof type grounding alarm device, the explosion-proof box, the grounding clamp and the audible and visual alarm are arranged in a matched mode, when the grounding clamp is in good contact with a metal body needing to be grounded, the voltage of the two ends of the grounding clamp is very small and is close to zero potential, the alarm driving circuit is in a locked state, and the alarm outputs no sound and light alarm; when grounding is poor, the two ends of the grounding clamp are in high level, the alarm circuit is triggered to act, and the alarm can give out sound and light alarms to prompt field personnel to be grounded again.

Description

Technical Field

[0001] The utility model relates to the technical field of alarm devices, in particular to an explosion-proof grounding alarm device. Background Art

[0002] When vehicles and ships in explosion-proof areas load and unload liquid flammable and explosive materials, the liquid will generate static electricity. In order to prevent the generation of static sparks, vehicles and ships must be well grounded through grounding clamps to discharge the static charge to the ground. The general practice is to use an intrinsically safe static grounding alarm. The power supply uses a disposable battery with a battery voltage of 3V. The buzzer is intrinsically safe, the volume is very low, there is no indicator light, the battery cannot be replaced, and the service life is very short. It is suitable for noise-free places. This new type is flameproof, the power supply uses external direct current, the grounding clamp is intrinsically safe, and the explosion-proof box is flameproof. Once the grounding is poor, it can emit a loud alarm sound and a dazzling flash, which is suitable for various explosion-hazardous environments.

[0003] Based on the above situation, the utility model proposes an explosion-proof grounding alarm device, which can effectively solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an explosion-proof grounding alarm device. The explosion-proof grounding alarm device of the utility model has a simple structure and is easy to use. Through the coordinated setting between the explosion-proof box, the grounding clamp and the sound and light alarm, when the grounding clamp is in good contact with the metal body that needs to be grounded, the voltage at both ends of the grounding clamp is very small, close to zero potential, so that the alarm drive circuit is in a locked state, and the alarm has no sound and light alarm output; when the grounding is poor, the two ends of the grounding clamp are high level, triggering the alarm circuit to operate, and the alarm will send out sound and light alarms to prompt the on-site personnel to reconnect the ground.

[0005] The utility model is realized by the following technical solutions:

[0006] An explosion-proof grounding alarm device comprises an explosion-proof box and a grounding clamp, wherein the explosion-proof box is provided with a power interface and an explosion-proof interface, wherein the explosion-proof interface is electrically connected to the grounding clamp, wherein the explosion-proof box is provided with an audible and visual alarm, wherein the audible and visual alarm comprises a buzzer HA and a flashing indicator light L, and wherein the grounding clamp is provided with a first electrode P1 and a second electrode P2;

[0007] The explosion-proof box is provided with a circuit board, and the circuit board is provided with a 24V terminal, a 0V / PE terminal, a DC / DC converter, a first resistor R1, a second resistor R2, a third resistor R3, a diode DZ, an NPN transistor T, and a photoelectric coupler OC. The 24V terminal is electrically connected to the 24V interface of the DC / DC converter, one end of the second resistor R2, one end of the buzzer HA, and one end of the flash indicator light L, respectively. The 5V interface of the DC / DC converter is electrically connected to one end of the first resistor R1 and the negative electrode of the diode DZ, respectively. The other end of the first resistor R1 is electrically connected to the negative electrode of the diode DZ. The end is electrically connected to pin 1 of the photoelectric coupler OC, pin 2 of the photoelectric coupler OC is electrically connected to the first electrode P1, the second electrode P2 is electrically connected to the anode of the diode DZ, pin 4 of the photoelectric coupler OC, the emitter of the NPN transistor T, and the 0V / PE terminal respectively, the base of the NPN transistor T is electrically connected to one end of the third resistor R3, the other end of the third resistor R3 is electrically connected to pin 3 of the photoelectric coupler OC and the other end of the second resistor R2 respectively, and the collector of the NPN transistor T is electrically connected to the other end of the buzzer HA and the other end of the flash indicator light L respectively.

[0008] The purpose of the utility model is to provide an explosion-proof grounding alarm device. The explosion-proof grounding alarm device of the utility model has a simple structure and is easy to use. Through the coordinated setting between the explosion-proof box, the grounding clamp and the sound and light alarm, when the grounding clamp is in good contact with the metal body that needs to be grounded, the voltage at both ends of the grounding clamp is very small, close to zero potential, so that the alarm drive circuit is in a locked state, and the alarm has no sound and light alarm output; when the grounding is poor, the two ends of the grounding clamp are high level, triggering the alarm circuit to operate, and the alarm will send out sound and light alarms to prompt the on-site personnel to reconnect the ground.

[0009] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0010] The explosion-proof grounding alarm device of the utility model has a simple structure and is easy to use. Through the coordinated arrangement of the explosion-proof box, the grounding clamp and the sound and light alarm, when the grounding clamp is in good contact with the metal body that needs to be grounded, the voltage at both ends of the grounding clamp is very small, close to zero potential, so that the alarm drive circuit is in a locked state, and the alarm has no sound and light alarm output; when the grounding is poor, the two ends of the grounding clamp are high level, triggering the alarm circuit to operate, and the alarm will send out sound and light alarms to prompt on-site personnel to reconnect the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as a limitation on this patent.

[0014] Embodiment 1:

[0015] like Figures 1 to 2 As shown, the utility model provides an explosion-proof grounding alarm device, including an explosion-proof box 1 and a grounding clamp 2, the explosion-proof box 1 is provided with a power interface 11 and an explosion-proof interface 12, the explosion-proof interface 12 is electrically connected to the grounding clamp 2, the explosion-proof box 1 is provided with an audible and visual alarm 3, the audible and visual alarm 3 includes a buzzer HA and a flash indicator light L, and the grounding clamp 2 is provided with a first electrode P1 and a second electrode P2;

[0016] The explosion-proof box 1 is provided with a circuit board, and the circuit board is provided with a 24V terminal, a 0V / PE terminal, a DC / DC converter, a first resistor R1, a second resistor R2, a third resistor R3, a diode DZ, an NPN transistor T, and a photoelectric coupler OC. The 24V terminal is electrically connected to the 24V interface of the DC / DC converter, one end of the second resistor R2, one end of the buzzer HA, and one end of the flash indicator light L, respectively. The 5V interface of the DC / DC converter is electrically connected to one end of the first resistor R1 and the negative electrode of the diode DZ, respectively. The other end of the first resistor R1 is electrically connected to the negative electrode of the diode DZ. The end is electrically connected to pin 1 of the photoelectric coupler OC, pin 2 of the photoelectric coupler OC is electrically connected to the first electrode P1, the second electrode P2 is electrically connected to the anode of the diode DZ, pin 4 of the photoelectric coupler OC, the emitter of the NPN transistor T, and the 0V / PE terminal respectively, the base of the NPN transistor T is electrically connected to one end of the third resistor R3, the other end of the third resistor R3 is electrically connected to pin 3 of the photoelectric coupler OC and the other end of the second resistor R2 respectively, and the collector of the NPN transistor T is electrically connected to the other end of the buzzer HA and the other end of the flash indicator light L respectively.

[0017] When in use, clamp the grounding clamp 2 on the metal parts of the vehicle body or hull. If there is an alarm, it proves that the contact is poor. It is necessary to reconnect or remove impurities on the surface of the metal parts until there is no sound or light alarm.

[0018] In industrial and mining enterprises, when vehicles and ships loading and unloading flammable and explosive materials are docked in explosion-proof areas, they must be grounded. If the grounding is poor or there is no grounding, static sparks may be generated. When the sparks encounter leaked flammable and explosive materials, fire or explosion may occur. This alarm device uses explosion-proof technology and instrument safety barrier voltage and current limiting principles to prevent sparks. It consists of an explosion-proof box 1, electronic circuits in the box, an audible and visual integrated alarm on the box, and a grounding clamp 2. It can work in explosion-proof areas. Connect the grounding clamp 2 to the metal body that needs to be grounded. The connected metal body is at the same potential as the earth, and the static electricity is discharged to the earth through the grounding clamp 2. When the grounding clamp 2 is in good contact with the metal body that needs to be grounded, the voltage at both ends of the grounding clamp 2 is very small, close to zero potential, so that the alarm drive circuit is in a locked state, and the alarm has no sound and light alarm output; when the grounding is poor, the two ends of the grounding clamp 2 are high level, triggering the alarm circuit to operate, and the alarm will send out sound and light alarms to prompt the on-site personnel to reconnect the ground; when the internal circuit fails, such as the internal circuit short circuit, the electric spark is controlled in the explosion-proof box 1; and the electric energy passing through the grounding clamp 2 is limited to less than 6V and less than 2mA. After voltage and current limiting, the energy flowing through the grounding clamp 2 is very small and insufficient to form electric sparks. The buzzer has a flashing indicator light, explosion-proof type, installed on the explosion-proof box 1, with a loud volume, can be used in a noisy environment, and the flashing indicator light is red, which is still very eye-catching in the daytime sunlight environment. The explosion-proof box 1 is flameproof, wall-mounted, and installed in a conspicuous place on site.

[0019] The working principle of one embodiment of the utility model is as follows:

[0020] The invention discloses an explosion-proof grounding alarm device. The power supply enters the circuit board through the 24V terminal and the 0V / PE terminal, and then passes through the DC / DC converter to obtain a 5V power supply. The 5V power supply is limited by the first resistor R1, isolated by the photoelectric coupler OC, and connected to two electrodes P1 and P2 of a grounding clamp 2. When the grounding clamp 2 is in an inactive state or in good contact with a metal body that needs to be grounded, P1 is connected with P2, current passes through OC, the output-end transistor of OC is turned on, the base of the NPN transistor T is pulled to a low level, T is not turned on, and the sound and light alarm 3 does not work. When the grounding clamp 2 is in poor contact with the metal body that needs to be grounded, P1 is not connected with P2, no current passes through OC, the output-end transistor of OC is turned off, the base of the transistor T is connected to the 24V power supply through R2 and R3, T is turned on, the sound and light alarm 3 is actuated, and a sound and light alarm is issued. The DC / DC power supply is used to reduce the voltage of the grounding clamp 2. DZ is a Zener diode with a breakdown voltage of 6V. Its function is to prevent the 24V power supply from being connected to the grounding clamp 2 in series when a line fault occurs. Due to the effects of DC / DC, R1, and DZ, the voltage across the grounding clamp 2 will not exceed 6V, and the current will not exceed 2mA, thereby limiting the spark of the grounding clamp 2 from being insufficient to ignite inflammable and explosive items.

[0021] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the explosion-proof grounding alarm device of the present invention, and can produce the positive effects recorded in the present invention.

[0022] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0023] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An explosion-proof grounding alarm device, characterized in that: It includes an explosion-proof box and a grounding clamp, the explosion-proof box is provided with a power interface and an explosion-proof interface, the explosion-proof interface is electrically connected to the grounding clamp, the explosion-proof box is provided with an audible and visual alarm, the audible and visual alarm includes a buzzer HA and a flashing indicator light L, and the grounding clamp is provided with a first electrode P1 and a second electrode P2; The explosion-proof box is provided with a circuit board, and the circuit board is provided with a 24V terminal, a 0V / PE terminal, a DC / DC converter, a first resistor R1, a second resistor R2, a third resistor R3, a diode DZ, an NPN transistor T, and a photoelectric coupler OC. The 24V terminal is electrically connected to the 24V interface of the DC / DC converter, one end of the second resistor R2, one end of the buzzer HA, and one end of the flash indicator light L, respectively. The 5V interface of the DC / DC converter is electrically connected to one end of the first resistor R1 and the negative electrode of the diode DZ, respectively. The other end of the first resistor R1 is electrically connected to the negative electrode of the diode DZ. The end is electrically connected to pin 1 of the photoelectric coupler OC, pin 2 of the photoelectric coupler OC is electrically connected to the first electrode P1, the second electrode P2 is electrically connected to the anode of the diode DZ, pin 4 of the photoelectric coupler OC, the emitter of the NPN transistor T, and the 0V / PE terminal respectively, the base of the NPN transistor T is electrically connected to one end of the third resistor R3, the other end of the third resistor R3 is electrically connected to pin 3 of the photoelectric coupler OC and the other end of the second resistor R2 respectively, and the collector of the NPN transistor T is electrically connected to the other end of the buzzer HA and the other end of the flash indicator light L respectively.

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