Grounding screw for fixing power line

Abstract

The utility model discloses a grounding screw used for fixing a power line, which comprises a nut, a screw rod, a line clamping flower tooth gasket and an elastic ring, the screw rod comprises a wiring polished rod section and a threaded section which are connected end to end, the screw rod is connected on the inner end face of the nut through the polished rod section, the wiring polished rod section is provided with a cambered surface slot, and the threaded section is provided with a threaded groove. Compared with a sharp thread, a larger contact area between the grounding screw and the power line is obtained, so that the conductive performance of the grounding screw is improved, and the grounding effect of the power line is ensured. The wire clamping toothed gasket and the elastic ring are arranged on the wiring polished rod section in a sleeving mode, the wire clamping toothed gasket can grasp and lock a power line and prevent the power line from sliding, and the elastic ring abuts against the lower side, away from the nut, of the wire clamping toothed gasket and supports the wire clamping toothed gasket, limits movement of the wire clamping toothed gasket on the wiring polished rod section and assists fixation of the power line. And in addition, the wire clamping serrated gasket is matched, so that the damping and buffering effects can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a grounding screw used for fixing a power line. Background Art

[0002] Various types of electrical equipment often use metal casings. The metal casings that are accessible to personnel need to be reliably grounded and conducted in accordance with safety standards to prevent the metal casing from becoming electrified due to accidents such as leakage and poor insulation, and to prevent personnel from touching the metal casing and getting an electric shock. After the metal casing is grounded, the current can flow into the earth through the ground wire, thereby avoiding electric shock.

[0003] The power cord is fixed by setting a grounding screw. After the grounding screw is locked, the power cord is fixed by the end of the screw rod away from the nut. However, the screw rod of a conventional grounding screw is full of threads, and the contact area on the threads is small. As a result, after the grounding screw is locked, for example, the commonly used flat-tail grounding screw, the contact area between the tail thread and the power cord is small, and the conductivity is poor, which affects the reliability of the grounding screw. Therefore, it is necessary to provide a new grounding screw improvement solution to solve the above technical problems. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a grounding screw for fixing a power line to solve the above problem.

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

[0006] The utility model provides a grounding screw for fixing a power line, comprising a nut, a screw rod, a wire clamping toothed gasket and an elastic ring, wherein the screw rod comprises a wiring bare rod section and a threaded section connected end to end, the screw rod is connected to the inner end surface of the nut through its bare rod section, the wire clamping toothed gasket and the elastic ring are sleeved on the wiring bare rod section, the elastic ring abuts against the lower side of the wire clamping toothed gasket away from the nut to support the wire clamping toothed gasket, and the wiring bare rod section is provided with an arc surface groove.

[0007] Preferably, the side wall of the connection polished rod segment is concave inwardly in the shape of an arc surface, forming the arc surface groove.

[0008] Preferably, the arc surface groove is a cutting groove formed by cutting along the radial direction of the polished rod segment.

[0009] Preferably, a waterproof gasket is also sleeved on the wiring bare rod section, and the waterproof gasket is located between the nut and the wire clamping tooth gasket.

[0010] Preferably, the arc-surface groove is located on the lower side of the waterproof gasket away from the nut and adjacent to the threaded section.

[0011] Preferably, the elastic ring is a rubber ring, and the waterproof gasket is a PVC gasket.

[0012] Preferably, a galvanized protective layer is provided on the outer surfaces of the nut and the screw.

[0013] Preferably, the maximum radial length of the wiring bare rod section is 5.9-6.0 mm, the outer diameter length of the threaded section is 4.83-4.98 mm, and the radial length of the nut is 9.8-10.0 mm.

[0014] The technical effects achieved by the technical solution of the utility model mainly include:

[0015] Based on the technical solution of the above grounding screw, a half-thread screw is used, one part of which is a wiring bare rod section and the other part is a threaded section. By cutting an arc surface groove on the wiring bare rod section at the upper part of the screw, when the grounding screw is used to fix the power cord, the power cord can be wound through the arc surface groove. Compared with a sharp thread, a larger contact area with the power cord can be obtained, thereby improving the conductive performance of the grounding screw, improving the grounding effect of the power cord, ensuring the reliability of the grounding screw, and facilitating the grounding screw to press the power cord and prevent it from loosening easily;

[0016] The wire clamping tooth gasket set on the wiring bare rod section can grasp and lock the power wire wound on the grounding screw to prevent the power wire from sliding;

[0017] The elastic ring below the clamping tooth gasket is tightly wrapped around the wiring bare rod section to limit the movement of the clamping tooth gasket on the wiring bare rod section, assist in fixing the power line, and can play a role of shock absorption and buffering in cooperation with the clamping tooth gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a grounding screw for fixing a power cord provided in an embodiment of the utility model;

[0019] Figure 2 For the corresponding Figure 1 A schematic cross-sectional view of the connection polished rod section at the section line AA';

[0020] Figure 3 For the corresponding Figure 1 A schematic cross-sectional view of the connection polished rod section at the middle section line BB';

[0021] Figure 4 It is a top view of the nut in the grounding screw.

[0022] The reference numerals in the above drawings are:

[0023] Nut 1, screw rod 2, connection rod section 21, arc surface slot 210, threaded section 22, wire clamping toothed gasket 3, elastic ring 4, waterproof gasket 5. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.

[0025] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not very relevant are omitted.

[0026] Reference Figure 1 As shown, an embodiment of the utility model provides a grounding screw for fixing a power cord, which includes a nut 1, a screw rod 2, a wire clamping toothed washer 3 and an elastic ring 4.

[0027] The screw rod 2 includes a connection rod section 21 and a threaded section 22 connected end to end. The screw rod 2 is connected to the inner end surface of the nut 1 through its rod section 21. The wire clamping toothed gasket 3 and the elastic ring 4 are sleeved on the connection rod section 21. The elastic ring 4 abuts against the lower side of the wire clamping toothed gasket 3 away from the nut 1 to support the wire clamping toothed gasket 3. The connection rod section 21 is provided with an arc groove 210.

[0028] The above-mentioned grounding screw provided by the embodiment of the utility model adopts a half-thread screw 2, one part of which is a wiring bare rod section 21 and the other part is a threaded section 22. By modifying the arc surface groove 210 on the wiring bare rod section 21 at the upper part of the screw 2, when the grounding screw is used to fix the power cord, the power cord can be wound through the arc surface groove 210, and a larger contact area with the power cord is obtained compared with the sharp thread, thereby improving the conductivity of the grounding screw, improving the grounding effect of the power cord, and being more conducive to the grounding screw pressing the power cord and not being easy to loosen. The clamping tooth gasket 3 can grasp and lock the power cord wound on the grounding screw, further preventing the power cord from sliding. The elastic ring 4 can be tightly fixed on the wiring bare rod section 21, below the clamping tooth gasket 3, limiting the movement of the clamping tooth gasket 3 on the wiring bare rod section 21, assisting in the fixation of the power cord, and cooperating with the clamping tooth gasket 3 can also play a role in shock absorption and buffering.

[0029] Combination Figure 1 , Figure 2 as well as Figure 3As shown, the side wall of the wiring bare rod section 21 is concave in an arc shape, forming the arc groove 210. It can be understood that the arc groove 210 can cater to the circular cross-sectional shape of the power cord, so that the outer wall of the power cord fits the arc groove 210 as closely as possible, thereby obtaining a larger contact area. Therefore, the specific dimensions including the concave depth of the arc groove 210 can be selected by the manufacturer according to the requirements of different power cords.

[0030] Exemplarily, the arc surface groove 210 is a cut groove formed by cutting along the radial direction of the polished rod segment 21. Obtaining grooves by cutting is a common process in screw processing, which is easy to implement and is conducive to reducing production costs and carrying out mass production.

[0031] Furthermore, a waterproof gasket 5 is sleeved on the wiring bare rod section 21, and the waterproof gasket 5 is located between the nut 1 and the wire clamping tooth gasket 3. The installation place of the grounding screw is an electrical device and a component, and it is necessary to prevent water vapor from invading the interior through the gap between the grounding screw and the installation hole. Therefore, by providing the waterproof gasket 5, the waterproof performance under the nut 1 can be improved to prevent water vapor from invading.

[0032] Considering the actual detour position of the power line, in order to facilitate wiring, specifically, the arc groove 210 is located at the lower side of the waterproof gasket 5 away from the nut 1 and adjacent to the threaded section 22.

[0033] Exemplarily, the elastic ring 4 is a rubber ring, and the waterproof gasket 5 is a PVC gasket.

[0034] In this embodiment, a galvanized protective layer is provided on the outer surface of the nut 1 and the screw 2. As a fastener, the screw will be exposed to water, oxygen and other substances during use. If it is not protected, it is easy to be corroded. After long-term use, the thread will be seriously damaged, which will bring great trouble and risk to the use. Therefore, galvanizing is required to increase the service life of the screw. In this embodiment, the outer surface of the nut 1 and the screw 2 is plated with a 5-8um blue zinc protective layer.

[0035] Combination Figure 1 and Figure 4 As shown, the preferred specifications and dimensions of some structures in the grounding screw are as follows:

[0036] The maximum radial length D1 of the connection polished rod section 21 is 5.9-6.0 mm, the outer diameter length D2 of the threaded section 22 is 4.83-4.98 mm, and the radial length D3 of the nut 1 is 9.8-10.0 mm.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A grounding screw for fixing a power cord, characterized in that: It comprises a nut (1), a screw (2), a thread clamping tooth gasket (3) and an elastic ring (4). The screw rod (2) comprises a connection rod section (21) and a threaded section (22) connected end to end. The screw rod (2) is connected to the inner end surface of the nut (1) through its rod section (21). The wire clamping toothed gasket (3) and the elastic ring (4) are sleeved on the connection rod section (21). The elastic ring (4) abuts against the lower side of the wire clamping toothed gasket (3) away from the nut (1) to support the wire clamping toothed gasket (3). The connection rod section (21) is provided with an arc groove (210).

2. The grounding screw for fixing a power line according to claim 1, characterized in that: The side wall of the connection polished rod section (21) is concave inwardly in the shape of an arc surface, forming the arc surface slot (210).

3. The grounding screw for fixing a power line according to claim 1, characterized in that: The arc surface groove (210) is a cutting groove formed by cutting along the radial direction of the polished rod segment (21).

4. The grounding screw for fixing a power line according to claim 1, characterized in that: The wiring bare rod section (21) is also sleeved with a waterproof gasket (5), and the waterproof gasket (5) is located between the nut (1) and the wire clamping tooth gasket (3).

5. The grounding screw for fixing a power line according to claim 4, characterized in that: The arc surface groove (210) is located on the lower side of the waterproof gasket (5) away from the nut (1) and is adjacent to the threaded section (22).

6. The grounding screw for fixing a power line according to claim 4, characterized in that: The elastic ring (4) is a rubber ring, and the waterproof gasket (5) is a PVC gasket.

7. The grounding screw for fixing a power line according to claim 1, characterized in that: A galvanized protective layer is provided on the outer surfaces of the nut (1) and the screw rod (2).

8. The grounding screw for fixing a power line according to claim 1, characterized in that: The maximum radial length of the connection rod section (21) is 5.9-6.0 mm, the outer diameter of the threaded section (22) is 4.83-4.98 mm, and the radial length of the nut (1) is 9.8-10.0 mm.

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