Cable fixing device

Abstract

The utility model relates to the technical field of cable mounting structures, aims to solve the problem of how to reduce the damage risk of a cable, and provides a cable fixing device which comprises a cover plate, a base and a first connecting piece. The cover plate comprises an upper cover and a first connecting part, an open groove is formed in the upper cover, and the first connecting part is connected to the end, in the first direction, of the upper cover. The base comprises a lower cover, a second connecting part and a limiting structure; the lower cover covers the upper cover in the second direction. The second connecting part is connected to one end of the lower cover close to the first connecting part along the first direction. The limiting structure comprises a penetrating part and a limiting part, the penetrating part is connected between the end, away from the second connecting part in the first direction, of the lower cover and the limiting part, the penetrating part penetrates through the open groove and can move relative to the upper cover in the first direction, and the limiting part is limited to the side, away from the lower cover, of the upper cover. The first connecting piece penetrates through the first connecting part and the second connecting part. The beneficial effect of the utility model is that the risk of cable damage is reduced.

Description

Technical Field

[0001] This application relates to the field of cable installation structure technology, and more specifically, to cable fixing devices. Background Technology

[0002] Cables are flexible or rigid transmission lines composed of a conductor, insulation layer, shielding layer (optional), and sheath layer, used to achieve safe, efficient, and interference-resistant transmission of electrical energy or signals in complex environments. For example, leaky coaxial cables (also known as leaky coaxial cables) support diverse applications of 5GHz band communication in urban rail transit, such as train operation control and dispatching, passenger service and information interaction, and multimedia communication during emergency communication and rescue operations. They need to be laid on the tunnel walls beside the track.

[0003] A cable fixing device is provided in the related art for fixing cables to locations such as tunnel walls. However, the pressure of the cable fixing device in the related art can easily cause external damage to the cable. Utility Model Content

[0004] This application provides a cable fixing device to address the problem of how to reduce the risk of cable damage.

[0005] This application provides a cable fixing device, including a cover plate, a base, and a first connector. The cover plate includes an upper cover and a first connecting portion. The upper cover has a slot, and the first connecting portion is connected to one end of the upper cover along a first direction. The base includes a lower cover, a second connecting portion, and a limiting structure. The lower cover is fitted onto the upper cover along a second direction to define a receiving space for accommodating a cable between the upper and lower covers. The second connecting portion is connected to one end of the lower cover along the first direction near the first connecting portion. The limiting structure includes a through-hole portion and a limiting portion. The through-hole portion is connected between one end of the lower cover along the first direction away from the second connecting portion and the limiting portion. The through-hole portion passes through the slot and is movable relative to the upper cover along the first direction. The limiting portion is located on the side of the upper cover away from the lower cover. The first connector is respectively through the first connecting portion and the second connecting portion. The first and second directions intersect.

[0006] In the aforementioned cable fixing device, the cover plate and base are fixed at one end along the first direction via a first connector, forming a rigid connection at this end. The tightening force of the bolts causes the upper cover to undergo initial deformation towards the lower cover. A limiting structure passes through the slot, restricting the separation of the upper and lower covers in the second direction to prevent cable clamping failure, but does not restrict the slight displacement of the upper cover along the first direction or the elastic warping deformation around one end of the first connector, forming a flexible limiting. The slot provides a gap along the first direction to accommodate the elastic deformation of the upper cover. When the first connector is tightened, the cover plate undergoes elastic bending around one end of the first connector, and the elastic recovery force of its bending deformation is the elastic clamping force acting on the cable. Compared to the rigid clamping of bolts at both ends, the clamping force of the cable fixing device comes from the elastic deformation of the material, which is adaptive and can be adapted to cables with different diameter tolerances. This avoids excessive tightening that could damage the cable sheath or deform the internal structure of the cable, reducing the risk of cable damage.

[0007] In one embodiment, the dimension of the limiting portion along the third direction is larger than the dimension of the slot along the third direction. The first direction, the second direction, and the third direction intersect each other.

[0008] In one embodiment, the dimension of the limiting portion along the first direction is smaller than the dimension of the slot along the third direction. The dimension of the through portion along the first direction is smaller than the dimension of the slot along the third direction.

[0009] In one embodiment, both the upper and lower covers are curved plates.

[0010] In one embodiment, the dimension of the accommodating space along the first direction is larger than the dimension of the accommodating space along the second direction.

[0011] In one embodiment, the slot extends from one end of the top cover to the other end along a first direction.

[0012] In one embodiment, the lower cover has a radiation marking line slot on the side near the upper cover, and the radiation marking line slot is connected to the receiving space.

[0013] In one embodiment, the base also includes a support base connected to the lower cover.

[0014] In one embodiment, the support includes an extension and a mounting portion. One end of the extension along a second direction is bent and connected to the lower cover, and the other end of the extension along the second direction is bent and connected to the mounting portion. The cable fixing device also includes a second connector that passes through the mounting portion.

[0015] In one embodiment, the extension is provided with an operating hole.

[0016] In one embodiment, the base is a one-piece molded part; and / or, the cover is a one-piece molded part. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of a cable fixing device according to an embodiment of this application.

[0019] Figure 2 for Figure 1 Side view of the cable fixing device in the illustrated embodiment.

[0020] Figure 3 for Figure 1 An exploded view of the cable fixing device in the illustrated embodiment.

[0021] Explanation of key component symbols:

[0022] Cable fixing device 100

[0023] 100a of space

[0024] Cover plate 10

[0025] Top cover 11

[0026] Slotting 11a

[0027] First connecting part 12

[0028] First threaded hole 12a

[0029] Base 20

[0030] Bottom cover 21

[0031] Radiation Identification Line Slot 21a

[0032] Second connecting part 22

[0033] Second threaded hole 22a

[0034] Limiting structure 23

[0035] Penetration Department 231

[0036] Limiting part 232

[0037] Support base 24

[0038] Extension 241

[0039] Operating hole 241a

[0040] Installation section 242

[0041] Third threaded hole 242a

[0042] First connector 30

[0043] Second connector 40

[0044] Locking part 50

[0045] First direction Z

[0046] Second direction Y

[0047] Third direction X

[0048] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0049] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0050] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0053] Example

[0054] For ease of understanding, the embodiments of this application introduce a first direction Z, a second direction Y, and a third direction X for description. The first direction Z, the second direction Y, and the third direction X are three non-parallel directions in a spatial coordinate system; in subsequent embodiments, the first direction Z, the second direction Y, and the third direction X are described as three mutually perpendicular reference directions in a three-dimensional Cartesian coordinate system. The directions shown in the embodiments of this application are used to help understand the relative positional relationships of the components, but do not limit their specific directions. It should be noted that perpendicularity within 5°, or the angle between two adjacent directions between 85° and 95°, can be considered perpendicular.

[0055] Figure 1 This is a perspective view of a cable fixing device 100 according to an embodiment of this application; Figure 2 for Figure 1 Side view of the cable fixing device 100 in the illustrated embodiment; Figure 3 for Figure 1 Exploded view of the cable fixing device 100 in the illustrated embodiment.

[0056] See Figures 1 to 3 This embodiment provides a cable fixing device 100, including a cover plate 10, a base 20, and a first connector 30 (such as a bolt). The cover plate 10 includes an upper cover 11 and a first connecting portion 12. The upper cover 11 has a slot 11a, and the first connecting portion 12 is connected to one end of the upper cover 11 along a first direction Z. The base 20 includes a lower cover 21, a second connecting portion 22, and a limiting structure 23. The lower cover 21 covers the upper cover 11 along a second direction Y to define a receiving space 100a for accommodating cables between the upper cover 11 and the lower cover 21. The second connecting portion 22 is connected to the end of the lower cover 21 along the first direction Z near the first connecting portion 12. The limiting structure 23 includes a through portion 231 and a limiting portion 232. The through portion 231 is connected between the end of the lower cover 21 away from the second connecting portion 22 along the first direction Z and the limiting portion 232. The through portion 231 passes through the slot 11a and can move relative to the upper cover 11 along the first direction Z. The limiting portion 232 is limited to the side of the upper cover 11 away from the lower cover 21. The first connecting member 30 passes through the first connecting portion 12 and the second connecting portion 22 respectively.

[0057] The cable fixing device 100 described above has a cover plate 10 and a base 20 fixed at one end along the first direction Z by a first connector 30, forming a rigid fixed connection between the cover plate 10 and the base 20 at this end. The tightening force of the bolts causes the upper cover 11 to undergo initial deformation towards the lower cover 21. The limiting structure 23 passes through the slot 11a, limiting the separation of the upper cover 11 and the lower cover 21 in the second direction Y, preventing failure of cable clamping, but not limiting the slight displacement of the upper cover 11 along the first direction Z and the elastic warping deformation around one end of the first connecting part 12, forming a flexible limiting. The slot 11a has a reserved gap along the first direction Z, providing space for the elastic deformation of the upper cover 11. When the first connector 30 is tightened, the cover plate 10 undergoes elastic bending around one end of the first connector 30, and the elastic recovery force of its bending deformation is the elastic clamping force acting on the cable. Compared to rigid clamping with bolts at both ends, the cable fixing device 100 uses elastic deformation of the material to clamp the cable, providing self-adaptability and accommodating cables with different diameter tolerances. This avoids excessive tightness that could damage the cable sheath or deform the internal structure, reducing the risk of cable damage. It also prevents excessive looseness that could cause cable movement. Furthermore, the elastic clamping force remains stable even when the cable expands or contracts slightly due to temperature changes, preventing clamping failure due to cable deformation. Therefore, it ensures that the cable does not loosen or shift under conditions of vibration and temperature changes, providing reliable and safe fixation even in harsh environments, such as when a high-speed train passes through a tunnel, creating strong piston-like winds that periodically disturb and vibrate surrounding objects.

[0058] The cable in this embodiment is, for example, a hollow flexible waveguide leaky cable, also known as a hollow structure flexible waveguide leaky coaxial cable. It uses a hollow metal cavity as the main transmission channel for electromagnetic waves, and its flexible structure design allows for flexible laying. Specific radiating grooves are created in the cavity wall to control the leakage of some of the transmitted electromagnetic wave energy along the line, thus achieving radio frequency transmission for wireless signal coverage. Hollow flexible waveguide leaky cables can be used for wireless communication coverage in subway and light rail tunnels. Their flexibility allows for laying in curved sections of tunnels, and their low-loss characteristics enable long-distance coverage. They are also used for communication and positioning signal transmission in enclosed spaces such as mines, underground utility tunnels, and civil defense projects, as well as for vehicle-road cooperative signal coverage in highway tunnels and bridges. As an important technology in the field of communication and signal transmission, its application prospects show significant potential in many emerging communication fields. This technology supports diverse applications of 5GHz band communication in urban rail transit, such as train operation control and scheduling, passenger service and information interaction, and multimedia communication during emergency communication and rescue. Since the waveguide leaky cable needs to be laid on the tunnel wall beside the track, the cable fixing device 100 can be installed on the tunnel wall and then the cable can be installed on the cable fixing device 100.

[0059] In some embodiments, such as Figure 3As shown, the first connecting part 12 has a first threaded hole 12a through which the first connecting member 30 passes, and the second connecting part 22 has a second threaded hole 22a through which the first connecting member 30 passes. In this case, the first threaded hole 12a and the second threaded hole 22a function as nuts. Of course, in other embodiments, an additional anti-loosening nut can be added below the second threaded hole 22a to strengthen the locking mechanism.

[0060] In some embodiments, the size of the limiting portion 232 along the third direction X is larger than the size of the slot 11a along the third direction X, so as to prevent the limiting portion 232 from coming out of the slot 11a.

[0061] In some embodiments, the dimension of the limiting part 232 along the first direction Z is smaller than the dimension of the slot 11a along the third direction X, and the dimension of the through part 231 along the first direction Z is smaller than the dimension of the slot 11a along the third direction X, so that the limiting part 232 and the through part 231 can be inserted into or removed from the slot 11a after rotating relative to the top cover 11 by a certain angle (such as 90 degrees).

[0062] Optionally, in this embodiment, the limiting part 232 and the through part 231 have a T-shaped structure.

[0063] In some embodiments, both the upper cover 11 and the lower cover 21 are arc-shaped plates to adapt to cables with arc-shaped outer contours, such as circular or elliptical cables, thereby increasing the contact area between the upper cover 11 and the lower cover 21 and the cable. It should be noted that the elliptical cable in this embodiment may have an anisotropic cross-section that is approximately elliptical.

[0064] In some embodiments, the dimension of the receiving space 100a along the first direction Z is larger than the dimension of the receiving space 100a along the second direction Y, so that the shape of the receiving space 100a can be adapted to an elliptical cable. Optionally, the upper cover 11 and the lower cover 21 can respectively fit precisely to the outer contour of the elliptical cable to avoid local stress concentration in the cable due to shape deviation. Circular cables, due to their structural symmetry, are more easily subjected to uniform force, so the cable fixing device 100 can also be used for circular cables.

[0065] It should be noted that the cover plate 10 and the base 20 are provided with axial rigid constraint at one end along the first direction Z by the first connector 30, and are constrained by the surface contact of the upper cover 11 at the other end along the first direction Z by the limiting part 232, which restricts separation along the second direction Y. When external force is applied to the second direction Y, the cover plate 10 and the base 20 have no effective deformation space. Therefore, they have strong resistance to deformation and high rigidity along the second direction Y, thereby ensuring the stability of the clamping direction and preventing the cable from moving along the second direction Y under vibration, impact and other working conditions, thus ensuring reliable clamping. When an external force is applied to the connection structure between the cover plate 10 and the base 20 along the first direction Z, the structure can allow the limiting structure 23 to slide slightly in the first direction Z through the slot 11a, and can also allow the cover plate 10 to elastically warp around one end of the first connector 30. The resistance of these two deformations is small, so the stiffness along the first direction Z is low, thereby adapting to the length direction expansion and contraction deformation of the cable caused by temperature changes, laying tension or vibration. Through the low stiffness deformation of the structure itself, the expansion and contraction of the cable is absorbed, avoiding the cable from being pulled apart or the structure from being damaged due to stress concentration.

[0066] Therefore, the cable fixing device 100 has low stiffness in the first direction Z and high stiffness in the second direction Y. When the cable is an elliptical cable, the dimension of the cable in the first direction Z is larger than the dimension in the second direction Y, so the stiffness of the cable in the first direction Z is low. Thus, the pressure of the cable fixing device 100 on the cable in different directions can match the stiffness of the cable in different directions, further preventing the cable from being flattened or twisted.

[0067] It should be noted that when the cable is a leaky cable, the slot 11a not only allows the threaded part 231 to pass through, but can also serve as a long slot for the leaky cable to radiate electromagnetic waves to the outside.

[0068] In some embodiments, the slot 11a extends from one end of the top cover 11 along the first direction Z to the other end to reduce the interference of the metal material on the electromagnetic field distribution of the cable (especially in high-frequency communication scenarios).

[0069] In some embodiments, the lower cover 21 has a radiation marking line slot 21a on the side near the upper cover 11. The radiation marking line slot 21a communicates with the receiving space 100a to ensure that the cable does not deflect after long-distance installation in tunnels or elevated sections, and that the radiation marking line is accurate. It should be noted that the leaky cable, through the periodic radiation slots opened in the outer conductor, enables it to transmit and receive electromagnetic wave signals in one direction, similar to the function of an antenna. To prevent the radiation direction of the leaky cable from being reversed during construction, the leaky cable manufacturer designs a raised back rib marking line (i.e., radiation marking line) along the length of the leaky cable on the sheath surface, indicating that there are radiation slots at 180° (directly opposite the back rib). To accommodate the raised back rib of the leaky cable, a recessed slot is added to hold the back rib in place, preventing the back rib from twisting and the leaky cable from flipping after long-distance installation. This recess is the radiation marking line slot 21a.

[0070] In some embodiments, the base 20 further includes a support 24 connected to the lower cover 21. The support 24 is used to connect with a pre-embedded structure (pre-embedded groove or pre-embedded sleeve, etc.) in the urban rail transit tunnel, or other mounting surfaces, such as walls, cable trays, towers, etc., to support the cable on the external structure.

[0071] In some embodiments, the support base 24 includes an extension 241 and a mounting portion 242. One end of the extension 241 along the second direction Y is bent and connected to the lower cover 21, and the other end of the extension 241 along the second direction Y is bent and connected to the mounting portion 242. The cable fixing device 100 also includes a second connector 40, which passes through the mounting portion 242. Thus, a third threaded hole 242a is provided on the mounting portion 242 for the second connector 40 to pass through. The second connector 40 can lock the mounting portion 242 to different mounting surfaces, thereby improving the compatibility of the support base 24 with different mounting surfaces. The extension 241 ensures that there is space between the cable and the mounting surface such as the wall, reducing signal obstruction and interference from the mounting surface.

[0072] In some embodiments, the support base 24 is an integrally formed part. For example, the support base 24 is a three-dimensional support structure made of flat stainless steel through multiple bending, punching and other processes. It does not require subsequent welding or fastener assembly, reduces seams and loosening points, avoids stress concentration, and improves the overall rigidity and fatigue resistance of the cable fixing device 100.

[0073] In some embodiments, the extension 241 is provided with an operating hole 241a to provide operating space for tools such as wrenches. Optionally, the operating hole 241a is provided at one end of the extension 241 along the second direction Y near the cover plate 10 to facilitate operation of the first connector 30.

[0074] In some embodiments, the second connector 40 is a T-bolt used to engage with a pre-embedded structure, such as a pre-embedded groove, in an urban rail transit tunnel.

[0075] Optionally, in this embodiment, the base 20 is a one-piece molded part, and / or the cover plate 10 is a one-piece molded part. Through continuous bending, punching and other processes, the flat stainless steel is processed into a three-dimensional support structure, which eliminates the need for subsequent welding or fastener assembly, reduces seams and loosening points, avoids stress concentration, and improves the overall rigidity and fatigue resistance of the cable fixing device 100.

[0076] During installation, first place the head of the second connector 40 into the pre-embedded groove, then rotate it 90 degrees clockwise to engage with the teeth inside the pre-embedded groove. Fit the mounting part 242 of the base 20 onto the second connector 40, and adjust the installation angle of the cable fixing device 100. For example, make the first direction Z parallel to the vertical direction, with the limiting structure 23 below and the second connector 22 above. Then, fix the base 20 to the second connector 40 using locking parts such as nuts 50. Next, assemble the cover plate 10. First, make the extension direction of the slot 11a approximately parallel to the extension direction of the limiting part 232, for example, make the extension direction of the slot 11a horizontal, so that the limiting part 232 passes through the slot 11a. Then, rotate the cover plate 10 90 degrees to align the upper cover 11 with the lower cover 21. Then, open the end of the cover plate 10 away from the limiting structure 23, place the cable into the base 20, and place the cable's radiation marking line (back rib) into the radiation marking line slot 21a to ensure the correct signal radiation direction and normal operation of the cable. Finally, close the cover plate 10, pass the first connector 30 through the first connecting part 12 and the second connecting part 22, and tighten it with a wrench or other installation tools to make the cover plate 10 and the base 20 fit together. Check the installation effect to ensure that the cable fixing device 100 does not loosen when the cable is shaken. The cable laying operation is then complete.

[0077] The aforementioned cable fixing device 100, by separately configuring the cover plate 10 and the base 20 and connecting them through the first connector 30 and the limiting structure 23, allows for the installation and fixing of hollow flexible waveguide leaky cables without drilling, facilitating quick installation, disassembly, and construction adjustments, thus saving operation time. By providing an arc-shaped accommodating space 100a that matches the outer contour of the elliptical cable, the contact area between the cable fixing device 100 and the cable is increased, preventing stress concentration.

[0078] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A cable fixing device, characterized in that, include: A cover plate includes an upper cover and a first connecting part, wherein the upper cover is provided with a slot, and the first connecting part is connected to one end of the upper cover along a first direction; A base includes a lower cover, a second connecting portion, and a limiting structure; the lower cover is fitted onto the upper cover along a second direction to define a receiving space for accommodating a cable between the upper cover and the lower cover; the second connecting portion is connected to one end of the lower cover along a first direction near the first connecting portion; the limiting structure includes a through portion and a limiting portion, the through portion being connected between one end of the lower cover along the first direction away from the second connecting portion and the limiting portion, the through portion passing through the slot and being movable relative to the upper cover along the first direction, the limiting portion being located on the side of the upper cover opposite to the lower cover; and... The first connector is respectively inserted into the first connecting part and the second connecting part; The first direction and the second direction intersect.

2. The cable fixing device according to claim 1, characterized in that: The dimension of the limiting part along the third direction is greater than the dimension of the slot along the third direction; The first direction, the second direction, and the third direction intersect each other.

3. The cable fixing device according to claim 2, characterized in that: The dimension of the limiting portion along the first direction is smaller than the dimension of the slot along the third direction; The dimension of the through portion along the first direction is smaller than the dimension of the slot along the third direction.

4. The cable fixing device according to claim 1, characterized in that: Both the upper cover and the lower cover are curved plates.

5. The cable fixing device according to claim 1, characterized in that: The dimension of the accommodating space along the first direction is greater than the dimension of the accommodating space along the second direction.

6. The cable fixing device according to claim 1, characterized in that: The slot extends from one end of the top cover to the other end along the first direction.

7. The cable fixing device according to claim 1, characterized in that: The lower cover has a radiation marking line slot on the side near the upper cover, and the radiation marking line slot is connected to the receiving space.

8. The cable fixing device according to claim 1, characterized in that: The base also includes a support base, which is connected to the lower cover; The support base includes an extension and a mounting portion. One end of the extension along the second direction is bent and connected to the lower cover, and the other end of the extension along the second direction is bent and connected to the mounting portion. The cable fixing device further includes a second connector, which passes through the mounting portion.

9. The cable fixing device according to claim 8, characterized in that: The extension is provided with an operating hole.

10. The cable fixing device according to any one of claims 1-9, characterized in that, The base is a one-piece molded part; and / or, the cover plate is a one-piece molded part.

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