A ground resistance test device for lightning protection detection

Abstract

The present invention relates to the field of grounding resistance technology, and in particular to a grounding resistance test device for lightning protection detection, comprising an ohmmeter, a mounting groove is provided at the lower end of the ohmmeter, bearings are fixedly connected to the inner walls of both sides of the mounting groove, a winding roller is fixedly connected to the inner axial surface of the bearing, a rotating shaft is fixedly connected to the upper end of the winding roller, a limiting mechanism is arranged on the rotating shaft, connecting wires are connected to both sides of the lower end of the ohmmeter, the connecting wires are wound on the winding roller, a sliding rod is fixedly connected to the lower end of the connecting wire, a clamping plate is fixedly connected to one end of the sliding rod, a movable plate is connected to the sliding rod through a clamping mechanism, and the movable plate, the sliding rod and the clamping plate are all made of metal materials. The present invention has the characteristic of being convenient for testing grounding resistances of different lengths and diameters.

Description

Technical Field

[0001] The invention relates to the technical field of grounding resistance, and in particular to a grounding resistance testing device for lightning protection detection. Background Art

[0002] Grounding resistance is the resistance encountered when current flows from the grounding device into the earth and then flows through the earth to another grounding body or spreads to a distant place. The value of the resistance is detected by a test device to see whether the resistance value of the grounding resistance meets the standard. The resistance value is measured by connecting the two ends of the resistance with the test device. However, the test device in the prior art cannot adjust the length of the wire, and it is not convenient to fix and clamp resistors of different diameters, which makes it inconvenient to detect grounding resistors of different lengths and diameters. For this reason, we propose a grounding resistance test device for lightning protection detection. Summary of the invention

[0003] The purpose of the present invention is to solve the disadvantage in the prior art that it is inconvenient to detect resistors of different diameters and lengths, and to propose a grounding resistance test device for lightning protection detection.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A ground resistance test device for lightning protection detection is designed, including an ohmmeter, a mounting groove is opened at the lower end of the ohmmeter, bearings are fixedly connected to the inner walls on both sides of the mounting groove, a winding roller is fixedly connected to the inner axial surface of the bearing, a rotating shaft is fixedly connected to the upper end of the winding roller, a limiting mechanism is arranged on the rotating shaft, connecting wires are connected to both sides of the lower end of the ohmmeter, the connecting wires are wound around the winding roller, a sliding rod is fixedly connected to the lower end of the connecting wire, a clamping plate is fixedly connected to one end of the sliding rod, a movable plate is connected to the sliding rod through a clamping mechanism, and the movable plate, the sliding rod and the clamping plate are all made of metal materials.

[0006] Preferably, the limiting mechanism includes a fixing plate fixedly connected to the ohmmeter, a threaded hole is provided on the fixing plate, a threaded rod is threadedly connected to the threaded hole, the lower end of the threaded rod is fixedly connected to the limiting plate, the limiting plate is located directly above the rotating shaft, and a handle is fixedly connected to the threaded rod.

[0007] Preferably, a rotating knob is fixedly connected to the rotating shaft.

[0008] Preferably, the clamping mechanism includes a moving ring fixedly connected to the moving plate, the moving ring is sleeved on the sliding rod, the sliding rod is sleeved with a spring, one end of the spring is fixedly connected to the moving ring, and the other end of the spring is fixedly connected to the clamping plate, and the spring is in a stretched state.

[0009] Preferably, the other end of the sliding rod is fixedly connected to a limiting block, the limiting block is circular, and the diameter of the limiting block is larger than the inner diameter of the moving ring.

[0010] Preferably, connecting ears are fixedly connected to both sides of the ohmmeter, and anti-slip grooves are provided on the connecting ears.

[0011] Preferably, both ends of the winding roller are fixedly connected to limit disks.

[0012] Preferably, the movable plate, the sliding rod and the clamping plate can be made of copper.

[0013] The invention proposes a grounding resistance testing device for lightning protection detection, which has the beneficial effects of: through the design of the installation groove, the rotating shaft, the winding roller, and the limiting mechanism, it is convenient to wind and reel the connecting wire so as to measure resistances of different lengths; at the same time, through the design of the clamping plate, the clamping mechanism, and the movable plate, it is convenient to fix resistances of different diameters so as to measure grounding resistances of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a ground resistance test device for lightning protection detection proposed by the present invention;

[0015] Figure 2 A grounding resistance test device for lightning protection detection proposed by the present invention Figure 1 A front view of

[0016] Figure 3 A grounding resistance test device for lightning protection detection proposed by the present invention Figure 1 Bottom view of

[0017] Figure 4 A grounding resistance test device for lightning protection detection proposed by the present invention Figure 1 A magnified view of part A;

[0018] Figure 5 A grounding resistance test device for lightning protection detection proposed by the present invention Figure 1 A magnified view of part B;

[0019] Figure 6 A grounding resistance test device for lightning protection detection proposed by the present invention Figure 3 Enlarged view of part C;

[0020] In the figure: ohmmeter 1, connecting ear 2, mounting groove 3, connecting wire 4, anti-slip groove 5, spring 6, slide rod 7, limit block 8, clamping plate 9, moving plate 10, rotating knob 11, fixing plate 12, handle 13, moving ring 14, threaded rod 15, limit plate 16, rotating shaft 17, winding roller 18, limit disk 19, bearing 20. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1

[0023] Reference Figure 1-6 A grounding resistance test device for lightning protection detection includes an ohmmeter 1, a mounting groove 3 is opened at the lower end of the ohmmeter 1, bearings 20 are fixedly connected to the inner walls of both ends of the mounting groove 3, a winding roller 18 is fixedly connected to the inner axial surface of the bearing 20, a rotating shaft 17 is fixedly connected to the upper end of the winding roller 18, a rotating knob 11 is fixedly connected to the rotating shaft 17, a limiting mechanism is arranged on the rotating shaft 17, by rotating the knob 11, the rotating shaft 17 will be driven to rotate, so that the winding roller 18 can adjust the length of the connecting wire 4, so as to test the resistance value of the grounding resistor with different lengths.

[0024] Both sides of the lower end of the ohmmeter 1 are connected with connecting wires 4, which are wound on the winding roller 18. The lower end of the connecting wire 4 is fixedly connected with a slide bar 7, one end of the slide bar 7 is fixedly connected with a clamping plate 9, and the slide bar 7 is connected with a movable plate 10 through a clamping mechanism. The movable plate 10, the slide bar 7 and the clamping plate 9 are all made of metal materials. The movable plate 10, the slide bar 7 and the clamping plate 9 can be specifically made of copper. The grounding resistor is fixed by the movable plate 10 and the clamping plate 9, and the grounding resistor is connected to the circuit. The resistance value of the grounding resistor will be displayed on the ohmmeter 1, so as to test whether the actual value of the resistance is consistent with the standard value.

[0025] Example 2

[0026] Reference Figure 5 As another preferred embodiment of the present invention, the difference from Embodiment 1 is that the limiting mechanism includes a fixing plate 12 fixedly connected to the ohmmeter 1, a threaded hole is opened on the fixing plate 12, a threaded rod 15 is threadedly connected in the threaded hole, a limiting plate 16 is fixedly connected to the lower end of the threaded rod 15, the limiting plate 16 is located directly above the rotating shaft 17, and a handle 13 is fixedly connected to the threaded rod 15. By rotating the handle 13, the threaded rod 15 is driven to rotate, so that the limiting plate 16 abuts against the rotating shaft 17, thereby fixing the rotating shaft 17 to prevent the rotating shaft 17 from rotating, thereby fixing the length of the connecting wire 4 to prevent the connecting wire 4 from being put in too much, causing the wire to be entangled and knotted.

[0027] Example 3

[0028] Reference Figure 4As another preferred embodiment of the present invention, the difference from Embodiment 1 is that the clamping mechanism includes a moving ring 14 fixedly connected to the moving plate 10, the moving ring 14 is sleeved on the slide bar 7, the slide bar 7 is sleeved with a spring 6, one end of the spring 6 is fixedly connected to the moving ring 14, and the other end of the spring 6 is fixedly connected to the clamping plate 9. The spring 6 is in a stretched state, and the restoring force of the spring 6 forms a pulling force on the moving ring 14, and the moving plate 10 is matched with the clamping plate 9, so that the resistor is fixed, and it is also convenient to fix resistors of different diameters.

[0029] Example 4

[0030] Reference Figure 4 As another preferred embodiment of the present invention, the difference from Embodiment 3 is that the other end of the slide rod 7 is fixedly connected to a limit block 8, the limit block 8 is circular, the diameter of the limit block 8 is larger than the inner diameter of the moving ring 14, and the limit block 8 limits the moving ring 14 to prevent the moving ring 14 from detaching from the slide rod 7.

[0031] Example 5

[0032] Reference Figure 1 As another preferred embodiment of the present invention, the difference from Embodiment 1 is that connecting ears 2 are fixedly connected to both sides of the ohmmeter 1, and anti-slip grooves 5 are provided on the connecting ears 2. The design of the connecting ears 2 makes it easier to grasp the ohmmeter 1, and the design of the anti-slip grooves 5 increases the friction force to prevent the ohmmeter 1 from falling when being grasped.

[0033] Example 6

[0034] Reference Figure 6 As another preferred embodiment of the present invention, the difference from Embodiment 1 is that both ends of the winding roller 18 are fixedly connected with a limiting disk 19. Through the design of the limiting disk 19, the wound connecting wire 4 is limited to prevent the connecting wire 4 from escaping from the winding roller 18.

[0035] In summary, the grounding resistance test device for lightning protection detection facilitates winding and reeling of the connecting wire through the design of the mounting groove, rotating shaft, winding roller, and limiting mechanism, so as to measure resistances of different lengths. At the same time, through the design of the clamping plate, clamping mechanism, and movable plate, it is convenient to fix resistances of different diameters, so as to measure grounding resistances of different diameters.

[0036] 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 according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ground resistance test device for lightning protection detection, comprising an ohmmeter (1), characterized in that: The lower end of the ohmmeter (1) is provided with a mounting groove (3), and bearings (20) are fixedly connected to the inner walls of both ends of the mounting groove (3), and the inner axial surface of the bearing (20) is fixedly connected to a winding roller (18), and the upper end of the winding roller (18) is fixedly connected to a rotating shaft (17), and a limiting mechanism is arranged on the rotating shaft (17). Both sides of the lower end of the ohmmeter (1) are connected to connecting wires (4), and the connecting wires (4) are wound on the winding roller (18). The lower end of the connecting wire (4) is fixedly connected to a sliding rod (7), and one end of the sliding rod (7) is fixedly connected to a clamping plate (9). The sliding rod (7) is connected to a movable plate (10) through a clamping mechanism, and the movable plate (10), the sliding rod (7) and the clamping plate (9) are all made of metal materials; The limiting mechanism comprises a fixing plate (12) fixedly connected to the ohmmeter (1), the fixing plate (12) being provided with a threaded hole, a threaded rod (15) being threadedly connected in the threaded hole, a limiting plate (16) being fixedly connected at the lower end of the threaded rod (15), the limiting plate (16) being located directly above the rotating shaft (17), and a handle (13) being fixedly connected to the threaded rod (15); The rotating shaft (17) is fixedly connected with a rotating knob (11); The clamping mechanism comprises a moving ring (14) fixedly connected to the moving plate (10), the moving ring (14) is sleeved on the sliding rod (7), a spring (6) is sleeved on the sliding rod (7), one end of the spring (6) is fixedly connected to the moving ring (14), the other end of the spring (6) is fixedly connected to the clamping plate (9), and the spring (6) is in a stretched state; The other end of the sliding rod (7) is fixedly connected to a limiting block (8); the limiting block (8) is circular, and the diameter of the limiting block (8) is greater than the inner diameter of the moving ring (14).

2. A grounding resistance test device for lightning protection detection according to claim 1, characterized in that: The ohmmeter (1) has connecting ears (2) fixedly connected to both sides, and the connecting ears (2) are provided with anti-slip grooves (5).

3. A ground resistance test device for lightning protection detection according to claim 1, characterized in that: Both ends of the winding roller (18) are fixedly connected to a limiting disk (19).

4. A ground resistance test device for lightning protection detection according to claim 1, characterized in that: The movable plate (10), the sliding rod (7) and the clamping plate (9) can be specifically made of copper.

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