Anti-loosening high-voltage cable terminal fixing device
By adopting a combined structure of cylindrical supporter, cold-condensing fixing pipe and fixing bolts, the threaded connection and the cable self-weight joint are used to solve the problem of difficult torque control when the existing cable terminal fixing device is laid vertically, and the stability and safety of cable fixing are achieved.
Patent Information
- Application Number
- CN202421789144.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-26
AI Technical Summary
When the existing cable terminal fixing device is laid vertically, the torque of the clamp pressing bolts is difficult to control, which can easily lead to damage or unfixed fixation of the internal structure of the cable, increasing the risk of cable loosening and magnetic circuit closure.
The combined structure of cylindrical supporter, cold-condensing fixing pipe and fixing bolts is adopted. Through the threaded connection and the occlusion of the cable's own weight, the decomposition force is parallel for the front and reverse teeth to ensure that the force is distributed evenly and avoid lateral stress.
It effectively solves the problems of unstable cable fixation and damage to the internal structure, improves the stability and safety of cable fixation, and avoids secondary problems such as magnetic circuit closure and fixture heating.
Smart Images
Figure CN222915627U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cable construction, in particular to a high-voltage cable terminal fixing device that prevents loosening. Background Art
[0002] The cable line construction of standard electrical installation projects requires that cables laid vertically or at an angle exceeding 45° should be fixed on each bracket, and the fixing clamps of single-core cables of AC systems or split-phase lead-sheathed cables after phase separation should not form a closed magnetic circuit.
[0003] The existing cable terminals are fixed by clamping the cables with L-shaped steel and U-shaped steel by tightening bolts. Or two semicircular steel rings are tightened by bolts to achieve the purpose of fixing. In order to ensure that the fixing fixture does not constitute a gasket for the closed magnetic circuit bolt and the cushion between the fixing fixtures, rubber or epoxy materials are used.
[0004] The existing vertical cable fixing method is essentially to tighten the clamp by bolts through lateral pressure to increase the longitudinal friction between the cable surface and the clamp to achieve the purpose of fixing the cable. The disadvantages of this method are:
[0005] 1. The clamp tightening bolt torque is difficult to control. If the bolt is pulled too tight, the clamp will squeeze the steel armor layer and copper shielding layer inside the cable. After squeezing, the steel armor layer and copper shielding layer are prone to deformation. In extreme cases, the copper shielding layer cuts the semi-conductive layer and the main insulation, causing electric field distortion and serious consequences. If the cable is pulled too loose, the friction between the cable surface and the clamp is insufficient, which will cause the cable to fall. The cable nose and its connected insulator will be under stress, which may lead to the risk of cable nose and core crimping breakage and insulator breakage.
[0006] 2. The rubber and epoxy gaskets set to disconnect the magnetic circuit will gradually age and become brittle over time. They may fall off without being discovered during maintenance, causing the fixture to heat up and damage the cable during operation. Utility Model Content
[0007] The purpose of the utility model is to provide a high-voltage cable terminal fixing device to prevent loosening in view of the defects of the prior art, so as to solve the problems of small contact area between the fixing fixture and the cable body, small friction coefficient, and easy loosening when laying high-voltage cables vertically. At the same time, it can also avoid the insulation damage caused by the operator fixing the fixing fixture and the cable too tightly to prevent loosening during construction, and the heating of the magnetic circuit closing fixture.
[0008] The technical purpose of the utility model is achieved through the following technical solutions: a high-voltage cable terminal fixing device to prevent loosening, including a cylindrical support, a cold shrink fixing tube and a fixing bolt, the cylindrical support includes two semi-cylindrical support parts, the two semi-cylindrical support parts are detachably connected by fixing bolts, one end of the cylindrical support is provided with a connecting ring, the inside of the cylindrical support is hollow and provided with an internal thread, and the outer wall of the cold shrink fixing tube is provided with an external thread that matches the internal thread.
[0009] Preferably, the cylindrical support is made of high-strength flame-retardant engineering plastics.
[0010] Preferably, both the internal thread and the external thread are Z-shaped hard rubber threads.
[0011] Preferably, a split type cold shrink support strip is provided in the cold shrink fixing tube.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] 1. The utility model provides a high-voltage cable terminal fixing device to prevent loosening, which changes the existing cable installation and fixing method, making the force applied to the cable more scientific during installation and fixing.
[0014] 2. The utility model provides an anti-loosening high-voltage cable terminal fixing device, which adopts threaded connection and uses the cable's own weight for full engagement. The multi-layer engagement decomposes the friction force increased by the lateral force squeezing the local point of the cable into positive and negative tooth engagement forces with a wide force area and parallel to the cable body. The force is evenly distributed, and there is no lateral stress on the cable. The high-strength flame-retardant engineering plastic material will not produce a closed magnetic circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 It is a schematic diagram of the structure of the cylindrical support in the utility model.
[0018] Figure 3 It is a structural schematic diagram of the cold shrink fixed tube in the utility model.
[0019] Figure 4 It is a structural schematic diagram of the semi-cylindrical support part in the utility model.
[0020] In the figure: 1. cylindrical support; 2. cold shrink fixing tube; 3. semi-cylindrical support part; 4. connecting ring; 5. internal thread; 6. external thread. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limitations on this patent.
[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.
[0024] See also Figures 1 to 4 The utility model provides a high-voltage cable terminal fixing device to prevent loosening, including a cylindrical support 1, a cold shrink fixing tube 2 and a fixing bolt. The cylindrical support 1 includes two semi-cylindrical support parts 3, and the two semi-cylindrical support parts 3 are detachably connected by fixing bolts. A connecting ring 4 is provided at one end of the cylindrical support 1. The cylindrical support 1 is hollow inside and is provided with an internal thread 5. The outer wall of the cold shrink fixing tube 2 is provided with an external thread 6 that is compatible with the internal thread 5.
[0025] In the above embodiment, since the cold shrink fixing tube 2 needs to form a connection relationship with the cylindrical support 1 when the cable is installed, it is necessary to provide a split cold shrink support strip in the cold shrink fixing tube 2 during the manufacturing stage to keep the cold shrink fixing tube 2 in an expanded state. This is basic common sense in cold shrink sleeves.
[0026] In some preferred embodiments, in order to ensure the structural strength of the cylindrical support 1 and its flame retardancy, the cylindrical support 1 in this embodiment is made of high-strength flame retardant engineering plastic.
[0027] In some preferred embodiments, in order to ensure the reliability of the connection between the cylindrical support 1 and the shrink fixing tube 2, the internal thread 5 and the external thread 6 in this embodiment are both Z-shaped hard rubber threads, and double-start threads can also be used to increase the force strength.
[0028] When installing cables using the anti-loosening high-voltage cable terminal fixing device provided by the utility model, first use sandpaper to polish the expected fixing place of the cable, then clean the polished surface, insert the cold shrink fixing tube into the expected fixing place of the cable, and pull out the cold shrink support strip; then align the split support with the positive and negative teeth to wrap the power cable, use bolts to fix the support, and finally connect and fix the anti-loosening high-voltage cable terminal fixing device provided by the utility model to the fixed building. This fixing method adopts threaded connection and uses the deadweight of the cable for full bite. The multi-layer bite decomposes the friction force increased by the lateral force squeezing the local point of the cable into the positive and negative tooth bite force with a wide force area and parallel to the cable body. The force is evenly distributed, and there is no lateral stress on the cable. The high-strength flame-retardant engineering plastic material will not produce a closed magnetic circuit.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A high voltage cable terminal fixing device for preventing loosening, characterized in that: It includes a cylindrical support, a shrink fixing tube and fixing bolts. The cylindrical support includes two semi-cylindrical support parts. The two semi-cylindrical support parts are detachably connected by fixing bolts. A connecting ring is provided at one end of the cylindrical support. The cylindrical support is hollow inside and is provided with an internal thread. The outer wall of the shrink fixing tube is provided with an external thread that matches the internal thread.
2. The anti-loosening high-voltage cable terminal fixing device according to claim 1 is characterized in that: The cylindrical support is made of high-strength flame-retardant engineering plastics.
3. The anti-loosening high-voltage cable terminal fixing device according to claim 1 is characterized in that: The internal thread and the external thread are both Z-shaped hard rubber threads.
4. The anti-loosening high-voltage cable terminal fixing device according to claim 1 is characterized in that: A split type cold shrink support strip is arranged in the cold shrink fixing tube.