Resistance measuring device

Abstract

The utility model discloses a resistance measuring device in the technical field of measuring devices, which comprises a shell, two ends of the shell are connected with connecting wires, one end of each connecting wire is connected with a metal clip, and one side of the shell is embedded with a power supply bin. According to the utility model, the connecting wires at the two ends of the shell are connected to the two ends of the grounding resistor to be detected through the metal clips, so that the grounding resistor to be detected and the measuring circuit and the power supply bin in the shell form a complete loop, and during measurement operation, the rotating disc is rotated by a hand to drive the contact sheet to slide on the sliding resistor sheet; the overall resistance value of the variable resistor assembly is adjusted, the maximum resistance value of the variable resistor assembly is far larger than ohm, the situation that the corresponding resistance value cannot be adjusted is avoided, the scale ring on the rotating disc is matched with the pointer for resistance value identification, and when the overall resistance value of the variable resistor assembly is adjusted and the voltmeter is zero, the identification resistance value of the scale ring is the grounding resistance value, and resistance measurement operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a resistance measuring device. Background Art

[0002] Grounding resistance is the resistance encountered by current flowing from the grounding device into the earth and then flowing through the earth to another grounding body or spreading to a distant place. Grounding resistance is an important parameter used to measure whether the grounding state is good. It is the resistance encountered by current flowing from the grounding device into the earth and then flowing through the earth to another grounding body or spreading to a distant place. It includes the resistance of the grounding wire and the grounding body itself, the contact resistance between the grounding body and the earth's resistance, and the resistance of the earth between the two grounding bodies or the earth's resistance from the grounding body to infinity. The grounding resistance is required to be less than 4 ohms, and the grounding resistance needs to be tested.

[0003] However, most of the existing grounding resistance measuring devices calculate after measuring the voltage data and current data detected by the voltmeter and the ammeter. The grounding resistance measurement data is inconvenient to read directly. Ordinary resistance measuring devices are inconvenient to carry and operate, and the use effect is not good. Based on this, the utility model designs a resistance measuring device to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a resistance measuring device to solve the above-mentioned problems that the ground resistance measurement data is inconvenient to read directly and the common resistance measuring device is inconvenient to carry.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A resistance measuring device, comprising a shell, both ends of the shell are connected to connecting wires, one end of the connecting wire is connected to a metal clip, a power supply compartment is embedded and installed on one side of the shell, a voltmeter is installed on the shell, a pointer is welded on the upper end of the shell, a variable resistor component is installed inside the shell, the variable resistor component comprises a mounting plate, a support rod is welded on the upper end of the mounting plate, a rotating disk is rotatably connected to the support rod, a scale ring is connected to the upper end of the rotating disk, a contact sheet is welded on the bottom end of the rotating disk, and an arc-shaped sliding resistor sheet is connected to the upper end of the mounting plate The contact sheet is in contact with the sliding resistor sheet, a measuring circuit is installed inside the shell, the measuring circuit includes a resistor to be measured Rx, a resistor RQ of a variable resistor assembly, a built-in resistor R1 and a built-in resistor R2, the built-in resistor R1 and the built-in resistor R2 are installed in the shell, the input end of the measuring circuit is electrically connected to the resistor Rx and the resistor R2, the downstream of the resistor Rx is electrically connected to the voltmeter and the resistor RQ, the downstream end of the resistor RQ serves as an output end of the circuit, the upstream end of the voltmeter is electrically connected to the resistor R2, and the downstream end of the resistor R2 is connected to the output end of the circuit through the resistor R1.

[0007] As a further solution of the utility model: the pointer is arranged at the upper end of the rotating disk, and one end of the pointer is in a pointed cone shape.

[0008] As a further solution of the utility model: an elastic plate is arranged in the middle of the contact piece, and the elastic plate is corrugated.

[0009] As a further solution of the utility model: the clamping end of the metal clip is tooth-shaped, and the metal clip is made of copper material.

[0010] As a further solution of the utility model: a storage bin is connected to the bottom of the shell, the bottom of the storage bin is open, and wire grooves are provided at both ends of the storage bin.

[0011] As a further solution of the utility model: both sides of the storage bin are connected with latching teeth, and a cover plate is latched with the bottom of the storage bin through the latching teeth.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, the connecting wires at both ends of the shell are connected to the two ends of the required detection grounding resistance through metal clips, so that the detection grounding resistance forms a complete loop with the measuring circuit and the power supply compartment inside the shell. During the measurement operation, the hand knob is used to rotate the disk to drive the contact piece to slide on the sliding resistor to adjust the overall resistance value of the variable resistor component. The maximum resistance value of the variable resistor component is much larger than ohms to avoid being unable to adjust the corresponding resistance value. The scale ring on the rotating disk cooperates with the pointer to mark the resistance value. When the overall resistance value of the variable resistor component is adjusted to make the voltmeter zero, the marked resistance value of the scale ring is the grounding resistance value, and the resistance measurement operation is convenient.

[0014] 2. In the utility model, a storage bin is connected through the bottom of the shell, and wire grooves are provided at both ends of the storage bin. The bottom of the shell is connected to the storage bin to fold and store the connecting wires at both ends. The connecting wires are clamped in the wire grooves to reduce the storage volume. A cover plate is clamped at the bottom of the storage bin through clamping teeth, and the open end of the storage bin is closed by the cover plate to prevent the folded and stored connecting wires from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 This is a bottom-up three-dimensional structural schematic diagram of the utility model;

[0017] Figure 3 This is a schematic diagram of the rotary disk connection structure of the utility model;

[0018] Figure 4This is a schematic diagram of the contact plate connection structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the resistance measurement circuit structure of the utility model.

[0020] In the figure: 1. Shell; 2. Connecting wire; 3. Metal clip; 4. Power supply compartment; 5. Voltmeter; 6. Pointer; 7. Mounting plate; 8. Support rod; 9. Contact piece; 10. Elastic plate; 11. Rotating disk; 12. Scale ring; 13. Sliding resistor; 14. Storage compartment; 15. Wire trough; 16. Cover plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example:

[0023] See also Figure 1-Figure 5 In an embodiment of the utility model, a resistance measuring device includes a shell 1, both ends of the shell 1 are connected to a connecting wire 2, one end of the connecting wire 2 is connected to a metal clip 3, a power supply compartment 4 is embedded and installed on one side of the shell 1, a voltmeter 5 is installed on the shell 1, a pointer 6 is welded on the upper end of the shell 1, a variable resistor assembly is installed inside the shell 1, and the variable resistor assembly includes a mounting plate 7, a support rod 8 is welded on the upper end of the mounting plate 7, a rotating disk 11 is rotatably connected to the support rod 8, a scale ring 12 is connected to the upper end of the rotating disk 11, a contact piece 9 is welded to the bottom end of the rotating disk 11, an arc-shaped sliding resistor sheet 13 is connected to the upper end of the mounting plate 7, and the contact piece 9 is in contact with the sliding resistor sheet 13. A measuring circuit is installed inside the shell 1, and the measuring circuit It includes a resistor Rx to be measured, a resistor RQ of a variable resistor component, a built-in resistor R1 and a built-in resistor R2. The built-in resistor R1 and the built-in resistor R2 are installed in a shell 1. The input end of the measuring circuit is electrically connected to the resistor Rx and the resistor R2. The downstream of the resistor Rx is electrically connected to the voltmeter 5 and the resistor RQ. The downstream end of the resistor RQ serves as an output end of the circuit. The upstream end of the voltmeter 5 is electrically connected to the resistor R2. The downstream end of the resistor R2 is connected to the output end of the circuit through the resistor R1. The connecting wires 2 at both ends of the shell 1 are connected to both ends of the required detection grounding resistance through metal clips 3, so that the detection grounding resistance forms a complete loop with the measurement circuit and the power supply compartment 4 inside the shell 1. In the measurement circuit, the voltmeter 5 is kept at the zero point. According to the equal pressure method, it can be obtained. Rx is positively correlated with RQ. When the resistance values ​​of the built-in resistor R1 and the built-in resistor R2 are equal, Rx is equal to RQ. During the measurement operation, the hand knob is used to rotate the disk 11 to drive the contact piece 9 to slide on the sliding resistor 13 to adjust the overall resistance value of the variable resistor component. The maximum resistance value of the variable resistor component is much greater than 4 ohms to avoid being unable to adjust the corresponding resistance value. The scale ring 12 on the rotating disk 11 cooperates with the pointer 6 to mark the resistance value. When the overall resistance value of the variable resistor component is adjusted to make the voltmeter 5 zero, the marked resistance value of the scale ring 12 is the grounding resistance value. The resistance measurement operation is convenient and the value can be read directly. The overall structure is compact and easy to use.

[0024] Preferably, Figure 1 As shown, the pointer 6 is arranged at the upper end of the rotating disk 11, and one end of the pointer 6 is in a pointed cone shape. The pointer 6 is arranged at the upper end of the rotating disk 11 for upper end indication. The pointed cone end of the pointer 6 facilitates clear indication and easy reading.

[0025] Preferably, Figure 4 As shown, an elastic plate 10 is provided in the middle of the contact piece 9. The elastic plate 10 is corrugated. The corrugated elastic plate 10 in the middle of the contact piece 9 ensures sufficient elasticity so that the contact piece 9 can stably contact the upper end of the sliding resistor 13.

[0026] Preferably, Figure 1 As shown, the clamping end of the metal clip 3 is tooth-shaped, and the metal clip 3 is made of copper material. The metal clip 3 made of copper material has good electrical conductivity, and the tooth-shaped clamping end of the metal clip 3 stably clamps the grounding resistance detection end.

[0027] Preferably, Figure 2 As shown, the bottom of the shell 1 is connected to a storage bin 14, the bottom of the storage bin 14 is open, and wire grooves 15 are provided at both ends of the storage bin 14. The bottom of the shell 1 is connected to the storage bin 14 to fold and store the connecting wires 2 at both ends. The connecting wires 2 are snapped into the wire grooves 15 to reduce the storage volume.

[0028] Preferably, Figure 2 As shown, the two sides of the storage bin 14 are connected with latches, and a cover plate 16 is latched at the bottom of the storage bin 14 through the latches. The open end of the storage bin 14 is closed by the cover plate 16 to prevent the folded and stored connection line 2 from falling off.

[0029] The working principle of the utility model is: the connecting wires 2 at both ends of the housing 1 are connected to the two ends of the required detection grounding resistance through the metal clip 3, so that the detection grounding resistance and the measuring circuit and the power supply compartment 4 inside the housing 1 form a complete loop. In the measuring circuit, the voltmeter 5 is kept at the zero point. According to the equal pressure method, it can be obtained Rx is positively correlated with RQ. When the resistance values ​​of the built-in resistor R1 and the built-in resistor R2 are equal, Rx is equal to RQ. During the measurement operation, the hand knob is used to rotate the disk 11 to drive the contact piece 9 to slide on the sliding resistor 13 to adjust the overall resistance value of the variable resistor component. The maximum resistance value of the variable resistor component is much greater than 4 ohms to avoid being unable to adjust the corresponding resistance value. The scale ring 12 on the rotating disk 11 cooperates with the pointer 6 to mark the resistance value. When the overall resistance value of the variable resistor component is adjusted to make the voltmeter 5 zero, the marked resistance value of the scale ring 12 is the grounding resistance value, and the resistance measurement operation is convenient.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A resistance measuring device, comprising a housing (1), characterized in that: Both ends of the shell (1) are connected to connecting wires (2), one end of the connecting wire (2) is connected to a metal clip (3), one side of the shell (1) is embedded with a power supply compartment (4), a voltmeter (5) is installed on the shell (1), a pointer (6) is welded to the upper end of the shell (1), a variable resistor assembly is installed inside the shell (1), and the variable resistor assembly includes a mounting plate (7), a support rod (8) is welded to the upper end of the mounting plate (7), a rotating disk (11) is rotatably connected to the support rod (8), a scale ring (12) is connected to the upper end of the rotating disk (11), a contact sheet (9) is welded to the bottom end of the rotating disk (11), and the mounting plate (7) is provided with a plurality of contact pieces (9). ) is connected to an arc-shaped sliding resistor (13), the contact sheet (9) is in contact with the sliding resistor (13), a measuring circuit is installed inside the housing (1), the measuring circuit includes a resistor to be measured Rx, a resistor RQ of a variable resistor assembly, a built-in resistor R1 and a built-in resistor R2, the built-in resistor R1 and the built-in resistor R2 are installed in the housing (1), the input end of the measuring circuit is electrically connected to the resistor Rx and the resistor R2, the downstream of the resistor Rx is electrically connected to the voltmeter (5) and the resistor RQ, the downstream end of the resistor RQ serves as an output end of the circuit, the upstream end of the voltmeter (5) is electrically connected to the resistor R2, and the downstream end of the resistor R2 is connected to the output end of the circuit through the resistor R1.

2. A resistance measuring device according to claim 1, characterized in that: The pointer (6) is arranged at the upper end of the rotating disk (11), and one end of the pointer (6) is in a pointed cone shape.

3. A resistance measuring device according to claim 1, characterized in that: An elastic plate (10) is arranged in the middle of the contact piece (9), and the elastic plate (10) is corrugated.

4. A resistance measuring device according to claim 1, characterized in that: The clamping end of the metal clip (3) is tooth-shaped, and the metal clip (3) is made of copper material.

5. A resistance measuring device according to claim 1, characterized in that: The bottom of the housing (1) is connected to a storage bin (14), the bottom of the storage bin (14) is open, and wire grooves (15) are provided at both ends of the storage bin (14).

6. A resistance measuring device according to claim 5, characterized in that: The two sides of the storage bin (14) are connected with latching teeth, and the bottom of the storage bin (14) is latched with a cover plate (16) via the latching teeth.

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