Double-end screw for fixing electrical equipment

Abstract

This utility model discloses a double-ended screw for fixing electrical equipment, including a rod body with a smooth rod section in the middle and threaded sections at both ends. A through hole is provided on the rod body, axially connecting to the end of the rod body. A protective cap is fitted onto the threaded section, the protective cap including a cap tube and a threaded ring. A corrugated tube is provided between the cap tube and the threaded ring, and the cap tube and the threaded ring have internal threads that engage with the threaded section. This utility model's double-ended screw, by opening resin injection holes within the rod body, can fill the installation gap of the double-ended screw, eliminating internal voids and cavities, and preventing loosening and disengagement due to vibration transmitted during the use of electrical equipment. Furthermore, the protective cap protects the exposed threaded section of the double-ended screw during installation, preventing it from being exposed to air, reducing corrosion, and extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of double-ended screw technology, specifically to a double-ended screw for fixing electrical equipment. Background Technology

[0002] Double-ended studs, also called double-ended bolts or double-ended studs, are used for fixing and connecting machinery. Double-ended bolts have threads on both ends and a threaded rod in the middle, which can be thick or thin. They are generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, cranes, large-span steel structures, and large buildings.

[0003] The most common form of existing double-ended screws is that both ends are threaded and the middle is a smooth rod, which can be used for locking threaded connections at both ends, and the two sets of threads are in opposite directions. In the existing double-ended screw technology, a threaded hole is pre-drilled on the equipment, one end is fixed to the equipment by threads, and the other end is connected to the installation target. One end on the equipment remains fixed for a long time, while the installation target at the other end will have the need for frequent disassembly.

[0004] The above technical conditions also have some drawbacks: Firstly, the depth of conventional pre-set threaded holes is generally greater than the length of the threaded part, and the bottom of the threaded hole is generally conical. This results in a cavity inside the equipment after the double-ended screw is fixed. Secondly, one end of the screw is directly exposed to the air and is prone to moisture and rust, which reduces its service life. Furthermore, corrosion can easily cause jamming, making subsequent disassembly very troublesome. Utility Model Content

[0005] In view of the prior art, the purpose of this utility model is to provide a double-ended screw with an inner hole and matching components, which can solve the technical problems mentioned in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a double-ended screw for fixing electrical equipment, comprising a rod body, a smooth rod portion in the middle of the rod body, threaded portions at both ends of the smooth rod portion, a through hole on the rod body, the through hole axially connecting to the end of the rod body, a protective plug cap fitted to the threaded portion, the protective plug cap comprising a cap tube and a screw ring, a corrugated tube between the cap tube and the screw ring, and an internal thread portion of the cap tube and the screw ring that is threadedly engaged with the threaded portion.

[0007] As a further provision of the above scheme, a radial hole is provided on the threaded portion on the opposite side of the through hole, and an axial groove extends from the threaded portion relative to the radial hole.

[0008] As a further feature of the above solution, a sealing gasket is also provided on the screw ring, and the sealing gasket is located on the other side of the screw ring connecting to the bellows.

[0009] As a further feature of the above solution, the threaded portion is fitted with an anti-loosening nut, which includes a threaded part and an anti-loosening spring.

[0010] As a further feature of the above scheme, the guide rod is provided with two sets of milled grooves, which are arranged symmetrically in mirror image on the guide rod.

[0011] Beneficial effects: The double-ended screw of this utility model can fill the installation gap of the double-ended screw by opening a resin injection hole in the rod body, eliminating internal voids and cavities, and avoiding the problem of loosening and falling off due to vibration transmitted during the use of electrical equipment. Secondly, a protective cap is also provided to protect the exposed threaded part of the double-ended screw during installation, so that it is not exposed to the air, reducing the problem of corrosion and extending its service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the double-headed screw structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the double-ended screw in use according to this embodiment.

[0014] Figure 3 This is a schematic cross-sectional view of the double-ended screw in this embodiment.

[0015] Reference numerals: 1. Rod body; 2. Plain rod section; 21. Milled groove; 3. Threaded section; 4. Through hole; 41. Radial hole; 42. Axial groove; 5. Locking nut; 51. Threaded part; 52. Locking spring; 6. Protective plug; 61. Cap tube; 62. Threaded ring; 63. Bellows; 64. Sealing gasket ring. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0017] like Figure 1-3 The double-ended screw for fixing electrical equipment shown includes a rod body 1, a smooth rod part 2 in the middle of the rod body 1, threaded parts 3 at both ends of the smooth rod part 2, a through hole 4 on the rod body 1, the through hole 4 axially connecting to the end of the rod body 1, a radial hole 41 on the threaded part 3 on the opposite side of the through hole 4, and an axial groove 42 extending from the threaded part 3 relative to the radial hole 41.

[0018] As described above, in this embodiment, after the threaded portion 3 with the through hole 4 at one end of the double-ended screw is fixed to the threaded hole at the mounting location, resin or other filler can be injected through the through hole 4 using an external device. This serves two purposes: firstly, it allows the double-ended screw to be completely fixed to the electrical equipment, preventing vibration from causing the screw to loosen; secondly, the high-pressure injected resin expels internal air, filling the connection gap and eliminating cavities. Furthermore, in this embodiment, the through hole 4 has a radial hole 41 and an axial groove 42 on the threaded portion 3 that extends into the threaded hole. The solidified resin fills the central thread, and the resin solidified in the axial groove 42 restricts the threaded portion 3 circumferentially relative to the threaded hole, causing the resin to coat the thread and the inner wall of the axial groove 42, preventing the double-ended screw from rotating and loosening.

[0019] As a further provision of the above scheme, the threaded portion 3 is provided with a protective plug 6, the protective plug 6 including a cap tube 61 and a screw ring 62, a bellows tube 63 is provided between the cap tube 61 and the screw ring 62, and the cap tube 61 and the screw ring 62 are provided with internal threads that are threadedly engaged with the threaded portion 3.

[0020] As a further provision of the above scheme, the screw ring 62 is also provided with a sealing gasket ring 64, which is located on the other side of the screw ring 62 connecting to the bellows 63.

[0021] As described above, in order to ensure that the thread exposed at the end of the electrical equipment can be used for a long time, the double-ended screw in this embodiment is also equipped with a protective cap 6 to cover and protect the thread. When using the protective cap 6 in this embodiment, the threaded ring 62 and the threaded part 3 need to be screwed in first. After screwing in close to the anti-loosening nut 5, the cap tube 61 at the rear end is also screwed in. After the threaded ring 62 abuts against the anti-loosening nut 5, the cap tube 61 is fastened to the end of the threaded part 3, and a corrugated tube 63 is provided between it and the threaded ring 62 to form a shielding and covering.

[0022] As a further feature of the above scheme, the threaded portion 3 is fitted with an anti-loosening nut 5, which includes a screw 51 and an anti-loosening spring 52.

[0023] As a further feature of the above scheme, the guide rod 2 is provided with two sets of milled grooves 21, and the two sets of milled grooves 21 are arranged in a mirror symmetrical manner on the guide rod 2.

[0024] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A double-ended screw for fixing electrical equipment, comprising a rod body (1), wherein a smooth rod portion (2) is provided in the middle of the rod body (1), and threaded portions (3) are provided at both ends of the smooth rod portion (2), characterized in that: The rod body (1) is provided with a through hole (4), which is axially connected to the end of the rod body (1). The threaded part (3) is provided with a protective cap (6). The protective cap (6) includes a cap tube (61) and a screw ring (62). A corrugated tube (63) is provided between the cap tube (61) and the screw ring (62). The cap tube (61) and the screw ring (62) are provided with internal threads that are threaded to the threaded part (3).

2. The double-ended screw for fixing electrical equipment according to claim 1, characterized in that: A radial hole (41) is provided on the threaded portion (3) on the opposite side of the through hole (4), and an axial groove (42) extends from the threaded portion (3) relative to the radial hole (41).

3. The double-ended screw for fixing electrical equipment according to claim 1, characterized in that: The screw ring (62) is also provided with a sealing gasket (64), which is located on the other side of the screw ring (62) connecting to the bellows (63).

4. A double-ended screw for fixing electrical equipment according to claim 1, characterized in that: The threaded portion (3) is fitted with a locking nut (5), which includes a screw (51) and a locking spring (52).

5. A double-ended screw for fixing electrical equipment according to claim 1, characterized in that: The smooth rod section (2) is provided with two sets of milled grooves (21), and the two sets of milled grooves (21) are arranged symmetrically in mirror image on the smooth rod section (2).

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