Mining flame-proof and intrinsic safety type grounding resistance testing device

Abstract

The utility model discloses a mining explosion-proof and intrinsic safety type grounding resistance testing device, which comprises an explosion-proof shell, fixing plates are fixed on the upper side of the explosion-proof shell, and mounting holes are formed in the fixing plates; a microprocessor controller is arranged in the explosion-proof shell, a handle is mounted on the upper side of the explosion-proof shell, a display window is formed in the front side of the explosion-proof shell, and a hinge is mounted on the front end side of the explosion-proof shell. After calculation and processing, the microprocessor controller obtains the grounding resistance value of the protective grounding grid at the collected position and related information and sends the grounding resistance value and the related information to the display and the Ethernet, so that the problem that the protective grounding resistance value is measured by manually using a grounding megger at regular intervals in the prior art is solved, the trouble of manually testing the grounding resistance on site is avoided, the operation is simpler, and the reliability is higher. The labor cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mining grounding resistance testing technology, and in particular relates to a mining explosion-proof and intrinsically safe grounding resistance testing device. Background Technology

[0002] Protective grounding of coal mine power supply systems is one of the three major protections in coal mines. In recent years, power supply systems built in major coal mines across the country have formed and applied a complete set of technologies around overcurrent protection and leakage protection. However, the implementation of protective grounding still relies on manual periodic visual inspection and the use of grounding megohmmeters to measure the protective grounding resistance value. This method has the problems of large subjective factors, low inspection frequency, complicated operation, and low safety. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a mine-use explosion-proof and intrinsically safe grounding resistance testing device. By installing a microprocessor controller inside the explosion-proof housing, externally acquired input signals are converted, processed, and sent to the microprocessor controller. After calculation and processing, the microprocessor controller obtains the grounding resistance value of the protective grounding network at the acquired location and related information, which is then sent to a display and an Ethernet connection. This solves the problem of relying on manual, periodic measurement of protective grounding resistance values ​​using a grounding megohmmeter, avoids the inconvenience of manual on-site grounding resistance testing, simplifies operation, reduces labor costs, and improves work efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A mining explosion-proof and intrinsically safe grounding resistance testing device includes an explosion-proof housing. A fixing plate is fixed to the upper side of the explosion-proof housing, and mounting holes are provided on the fixing plate. A handle is installed on the upper side of the explosion-proof housing. A display window is provided on the front side of the explosion-proof housing. A hinge is installed on the front end of the explosion-proof housing. Several input tubes are equidistantly arranged on the left side of the explosion-proof housing, and output tubes corresponding to the input tubes are provided on the right side of the explosion-proof housing. A grounding bolt and a keypad are provided on the right side of the explosion-proof housing. A microprocessor controller is installed inside the explosion-proof housing, and a display is installed in the display window. By setting up a microprocessor controller inside the explosion-proof housing, externally acquired input signals are converted and processed before being sent to the microprocessor controller. After calculation and processing, the microprocessor controller obtains the grounding resistance value of the protective grounding network at the acquired location and related information, which is then sent to the display and Ethernet. This solves the problem of relying on manual, periodic measurement of protective grounding resistance values ​​using a grounding megohmmeter, avoids the inconvenience of manual on-site grounding resistance testing, simplifies operation, reduces labor costs, and improves work efficiency.

[0006] Furthermore, the input terminals of the microprocessor controller are respectively connected to a data acquisition input, a keypad, and an RS 485, and the output terminals of the microprocessor controller are respectively connected to a display and an Ethernet. The display can display information such as the grounding resistance value and parameter settings of the protective grounding network in real time and in history. The grounding resistance value and parameter settings of the protective grounding network in real time and in history can be set by the keypad. The RS 485 can receive the RS 485 signal sent by the microprocessor controller, and the Ethernet can convert the signal sent by the microprocessor controller into an Ethernet electrical signal and send it out. The modules are fixed together in an integrated manner to achieve a reasonable structure and improve the reliability and service life of the circuit board.

[0007] Furthermore, the input terminal of the microprocessor controller is connected to a protection circuit. The input terminal of the protection circuit is connected to an AC 127V input, and the output terminal of the protection circuit is connected to a DC 12V power supply. The protection circuit protects the input power supply and performs intrinsically safe processing on the output signal.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. By installing a microprocessor controller inside the explosion-proof enclosure, externally acquired input signals are converted and processed before being sent to the microprocessor controller. After calculation and processing, the microprocessor controller obtains the grounding resistance value of the protective grounding network at the acquired location and related information, which is then sent to the display and Ethernet. This solves the problem of relying on manual, periodic measurement of protective grounding resistance values ​​using a grounding megohmmeter, avoids the hassle of manual on-site grounding resistance testing, simplifies operation, reduces labor costs, and improves work efficiency.

[0010] 2. The grounding resistance value and parameters of the protective grounding network can be set by pressing the keypad for real-time and historical data. RS485 enables it to receive incoming RS 485 signals, and Ethernet enables it to convert the signals sent by the microprocessor controller into Ethernet electrical signals for transmission. The modules are fixed together in an integrated manner to achieve a reasonable structure, improve the reliability and service life of the circuit board, and protect the input power supply and intrinsically ensure the safety of the output signal. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

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

[0013] In the diagram: 1. Explosion-proof housing, 2. Display window, 3. Handle, 4. Mounting hole, 5. Hinge, 6. Input tube, 7. Grounding bolt, 8. Keyboard, 9. Microprocessor controller, 10. Data acquisition input, 11. Display, 12. Protection circuit, 13. AC 127V input, 14. DC 12V power supply, 15. Ethernet, 16. RS 485. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example

[0016] See appendix Figure 1-2 As shown, a mine-use explosion-proof and intrinsically safe grounding resistance testing device includes an explosion-proof housing 1. A fixing plate is fixed to the upper side of the explosion-proof housing 1, and mounting holes 4 are provided on the fixing plate. A handle 3 is installed on the upper side of the explosion-proof housing 1. A display window 2 is provided on the front side of the explosion-proof housing 1. A hinge 5 is installed on the front end of the explosion-proof housing 1. Several input tubes 6 are equidistantly arranged on the left side of the explosion-proof housing 1. Output tubes corresponding to the input tubes 6 are provided on the right side of the explosion-proof housing 1. A grounding bolt 7 and a keypad 8 are provided on the right side of the explosion-proof housing 1. A microprocessor controller 9 is provided inside the explosion-proof housing 1. The display window 2 is equipped with a display 11. By setting a microprocessor controller 1 inside the explosion-proof housing 1, the externally acquired input signal 10 is converted and processed before being sent to the microprocessor controller 1. After calculation and processing, the microprocessor controller 1 obtains the grounding resistance value of the protective grounding network at the acquired location and related information, and sends it to the display 11 and Ethernet 15. This solves the problem of relying on manual periodic use of a grounding megohmmeter to measure the protective grounding resistance value, avoids the trouble of manual on-site grounding resistance testing, simplifies operation, reduces labor costs, and improves work efficiency.

[0017] The input terminals of the microprocessor controller 9 are connected to the acquisition input 10, the keypad 8, and the RS 485 16, respectively. The output terminals of the microprocessor controller 9 are connected to the display 11 and the Ethernet 15, respectively. The display 11 can display the grounding resistance value and parameter settings of the protective grounding network in real time and in history. The grounding resistance value and parameter settings of the protective grounding network in real time and in history can be set by the keypad 8. The RS 485 16 can receive the RS 485 signal sent by the microprocessor controller 9. The Ethernet 15 can convert the signal sent by the microprocessor controller 9 into an Ethernet electrical signal and send it out. The modules are fixed together in an integrated manner to achieve a reasonable structure and improve the reliability and service life of the circuit board.

[0018] The input terminal of the microprocessor controller 9 is connected to a protection circuit 12. The input terminal of the protection circuit 12 is connected to an AC 127V input 13, and the output terminal of the protection circuit 12 is connected to a DC 12V power supply 14. The protection circuit 12 protects the input power supply and performs intrinsic safety processing on the output signal.

[0019] Working principle: The externally acquired input signal 10 is converted and processed before being sent to the microprocessor controller 1. After calculation and processing, the microprocessor controller 1 obtains the grounding resistance value of the protective grounding network at the acquired location and related information, which is then sent to the display 11 and Ethernet 15. This solves the problem of relying on manual periodic measurement of the protective grounding resistance value using a grounding megohmmeter, avoiding the trouble of manual on-site grounding resistance testing, simplifying operation, reducing labor costs, and improving work efficiency. The display 11 can display real-time and historical grounding resistance values ​​and parameter settings of the protective grounding network. The real-time and historical grounding resistance values ​​and parameters of the protective grounding network can be set by pressing the keypad 8. The RS 485 16 can receive incoming RS 485 signals. The Ethernet 15 can convert the signals sent by the microprocessor controller 9 into Ethernet electrical signals and send them out. The modules are fixed together in an integrated manner, achieving a reasonable structure, improving the reliability and service life of the circuit board. The protection circuit 12 protects the input power supply and performs intrinsically safe processing on the output signal.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0021] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mining explosion-proof and intrinsically safe grounding resistance testing device, comprising an explosion-proof housing, wherein a fixing plate is fixed to the upper side of the explosion-proof housing, and mounting holes are provided on the fixing plate, characterized in that: A handle is installed on the upper side of the explosion-proof housing, a display window is opened on the front side of the explosion-proof housing, a hinge is installed on the front end of the explosion-proof housing, several input tubes are equidistantly arranged on the left side of the explosion-proof housing, an output tube corresponding to the input tubes is arranged on the right side of the explosion-proof housing, a grounding bolt and a keypad are arranged on the right side of the explosion-proof housing, a microprocessor controller is arranged inside the explosion-proof housing, and a display is arranged inside the display window.

2. The mining explosion-proof and intrinsically safe grounding resistance testing device according to claim 1, characterized in that: The input terminals of the microprocessor controller are respectively connected to a data acquisition input, a keyboard, and an RS 485, and the output terminals of the microprocessor controller are respectively connected to a display and an Ethernet.

3. The mining explosion-proof and intrinsically safe grounding resistance testing device according to claim 1, characterized in that: The microprocessor controller has a protection circuit connected to its input terminal. The input terminal of the protection circuit is connected to an AC 127V input, and the output terminal of the protection circuit is connected to a DC 12V power supply.

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