Cable protection device

Abstract

A cable protection device includes a cable reel and a protective cylinder. The protective cylinder has a cable passage at its center for the power supply cable to pass through. One end of the protective cylinder is embedded in a pipe, and the outer surface of the portion of the protective cylinder embedded in the pipe forms an expansion fit with the inner surface of the pipe. The cable reel is fixed to the other end of the protective cylinder. The beneficial effects of this invention are: through the cable passage at the center of the protective cylinder, the cable is guided and passes centrally through the passage during transport, avoiding direct contact with the sharp edges of the pipe opening. This effectively prevents damage or breakage of the cable insulation layer due to abrasion, improving the reliability and safety of cable installation.

Description

Technical Field

[0001] This utility model relates to a device for installing cables in a pipe, and more particularly to a cable protection device. Background Technology

[0002] In the field of cable installation, especially in applications such as power transmission, communication networks, and building wiring, threading cables into pre-buried conduits is a common construction step. For example, in urban construction, underground pipeline laying, or industrial facility renovation, operators typically use a cable reel as a cable storage and release device. The cable is pre-wound onto the reel, and then one end is inserted into the conduit inlet using manual or mechanical traction. During the pulling process, the cable is gradually released from the reel and moves along the inside of the conduit to the target position, completing the entire threading operation. This process involves matching the conduit diameter with the cable size to ensure smooth passage and relies on traction tools such as winches or pulleys for assistance. Typical scenarios include underground installations of electrical wiring or fiber optic communication systems in residential buildings, where the conduit protects the cable from external environmental damage, but installation efficiency is limited by manual intervention and physical conditions. Overall, this method is widely adopted due to its simplicity and low cost, making it an industry standard practice.

[0003] However, existing technologies have significant drawbacks, primarily the vulnerability of cables to damage during conduit installation. When cables are directly inserted into conduits from the reel, the conduit opening often lacks effective protective devices. As one end of the cable moves within the conduit, its surface repeatedly scrapes against the sharp edges or burrs of the conduit inlet, causing cuts or scratches to the cable sheath. This damage can expose the internal conductor, leading to short circuits, arcing, or insulation failure, potentially resulting in fires, electric shocks, and other safety accidents. Furthermore, this problem is exacerbated by rough conduits or rapid traction conditions, increasing maintenance costs and potential failure rates, necessitating improvements to enhance installation safety and reliability. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a cable protection device for preventing the outer sheath of cables from being cut when they move through pipe openings.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cable protection device, comprising a cable reel and a protective cylinder, wherein a cable passage for the power supply line is provided at the center of the protective cylinder, one end of the protective cylinder is embedded in a pipe and the outer surface of the portion of the protective cylinder embedded in the pipe forms an expansion fit with the inner surface of the pipe, and the cable reel is fixed to the other end of the protective cylinder.

[0006] The beneficial effects of this utility model are as follows: Through the cable passage at the center of the protective cylinder, the cable is guided and passes centrally through this passage during transport, avoiding direct contact with the sharp edges of the pipe opening. This effectively prevents damage or breakage of the cable insulation layer due to abrasion, improving the reliability and safety of cable installation. Simultaneously, one end of the protective cylinder is fitted into the pipe with an expansion fit. When the protective cylinder is inserted into the pipe, its outer surface forms a tight frictional contact with the inner wall of the pipe, generating sufficient fixing force. Even if external force is applied during cable pulling, it can prevent the protective device from accidentally dislodging, ensuring the stability of the entire transport process. Furthermore, the cable reel is fixed to the other end of the protective cylinder, facilitating smooth cable release and reducing installation resistance. As a preferred embodiment, the protective cylinder can be made of an elastic material (such as thermoplastic polyurethane), with a tapered outer surface design. When inserted into the pipe, the material's elasticity naturally expands to fit against the inner wall of the pipe, forming a reliable expansion fit. The inner wall of the cable passage is coated with a smooth polytetrafluoroethylene coating, reducing the coefficient of friction for cable passage and preventing cable jamming or wear during transport. This structure not only provides functional protection but also simplifies the installation process and is suitable for operating environments with different cable diameters.

[0007] Furthermore, the outer surface of the protective cylinder is provided with a deformation groove extending from the end face where the wire feeding wheel is fixed to the end face that mates with the pipe.

[0008] The design of this deformation groove significantly enhances the adaptability of the protective cylinder: on the one hand, it allows the outer diameter of the protective cylinder mating with the pipe to elastically deform when inserted into the pipe. The opening and closing of the groove adjusts the outer surface of the protective cylinder to fit more tightly against the inner wall of the pipe, forming a more reliable tightening fit and reducing the risk of loosening due to minor deviations in the pipe's inner diameter. On the other hand, the longitudinal extension of the deformation groove allows the protective cylinder to adapt to pipes of different inner diameters through its own compression or expansion, enabling it to be applied to various pipe sizes without replacing parts, thus improving the versatility and installation efficiency of the device. As a preferred design, the deformation groove is designed as one or more axial slots. When the protective cylinder is compressed, the slot width decreases, reducing the outer diameter of the protective cylinder for easier pipe insertion. After the pressure is released, the slot returns to its original position, increasing the outer diameter for tightening and fixation. Simultaneously, the groove width can be controlled within 1 / 3 to 1 / 2 of the protective cylinder wall thickness to ensure structural strength is not compromised, while the rounded edges of the groove avoid stress concentration and extend service life. This solution achieves efficient adaptive adjustment through a simple mechanical deformation principle.

[0009] Furthermore, the protective cylinder is provided with a positioning ring at one end of the fixed wire feeding wheel, and fixing plates for fixing the wire feeding wheel are symmetrically arranged on both sides of the positioning ring; the positioning ring is arranged around the outer surface of the protective cylinder and is arranged to avoid the deformation groove.

[0010] This structure effectively isolates the influence of deformation forces on the pay-off reel: the positioning ring, acting as a rigid support ring, is positioned around the outer surface of the protective cylinder but avoids the deformation groove. When the protective cylinder deforms due to the expansion fit, the positioning ring constrains its fixed end to prevent radial displacement, thus preventing the deformation force from being transmitted to the pay-off reel and avoiding pressure displacement or damage to the pay-off reel. Simultaneously, the fixing plates are symmetrically positioned on both sides of the positioning ring, providing a stable mounting base and ensuring the pay-off reel remains horizontally balanced during cable transport, reducing the risk of cable twisting or knotting. This improves the durability and operational stability of the device. As a preferred method, the positioning ring is made of a metal material (such as stainless steel) to form an annular sleeve, fixed to the outer surface of the protective cylinder by welding or bolting. Its inner diameter is slightly larger than the outer diameter of the protective cylinder to form a clearance fit, so that it only bears localized stress during deformation. The fixing plate is designed as an L-shaped bracket, with one end welded to the positioning ring and the other end connected to the pay-off reel via an adjustable bolt, allowing the pay-off reel's height to be finely adjusted to adapt to different cable traction angles. This design utilizes rigid elements to absorb deformation energy, ensuring that the core components are not disturbed.

[0011] Furthermore, the protective cylinder is provided with an adjustment component on the outer surface of the end where the wire feeding wheel is fixed, and the adjustment component is used to adjust the width of the deformation groove.

[0012] This adjustment component optimizes the installation and adjustment process of the device: Located on the outer surface of the fixed end of the protective cylinder, it avoids interference with the pipe opening during insertion, simplifying operation; by manually adjusting the width of the deformation groove, the outer diameter of the protective cylinder can be pre-reduced for smooth pipe insertion, and then the width can be increased after insertion to enhance the tightening force, achieving dynamic control of the fixing strength. This adapts to changes in the pipe's inner diameter or loosening after long-term use, improving installation accuracy and maintenance convenience. As a preferred embodiment, the adjustment component includes a lever mechanism with its base fixed to the outer surface of the protective cylinder. Rotating the handle drives a linkage system to change the distance between the two sides of the deformation groove; specifically, rotating the handle pushes a slider along a guide rail. The slider is connected to the edge of the deformation groove, causing the groove width to change linearly with the slider's displacement, thereby precisely controlling the expansion degree of the protective cylinder. This mechanical structure is intuitive to operate and allows for rapid adjustment without additional tools.

[0013] Furthermore, the adjustment assembly includes a backing plate, an adjustment plate, and an adjustment bolt. The backing plate and the adjustment plate are both fixed to the outer surface of the protective cylinder and are located on both sides of the deformation groove. The adjustment bolt cooperates with the adjustment plate and can move toward or away from the backing plate. An operating head is provided at the end of the adjustment bolt exposed outside the protective cylinder.

[0014] This specific structure enables reliable adjustment of the deformation groove width: the abutment plate and the adjusting plate are fixed on both sides of the deformation groove, serving as force transmission points. The adjusting bolt passes through the adjusting plate and is threaded into it. When the operating head is rotated, the bolt moves axially to push or pull the abutment plate, directly changing the distance between the two side plates, thereby precisely controlling the width of the deformation groove. The operating head is exposed, facilitating manual operation and allowing for real-time adjustment of the tension without disassembling the device, enhancing practicality and flexibility. As a preferred method, the abutment plate and adjusting plate are made of high-strength aluminum alloy to reduce weight and resist corrosion; the adjusting bolt uses a stainless steel threaded rod, and the operating head is designed as a hexagonal nut or knob. Users rotate the operating head by hand or with a wrench to compress the deformation groove when the bolt moves towards the abutment plate and releases it when it moves away. The working principle is based on the conversion of the helical motion of the thread into linear displacement, ensuring a smooth and controllable adjustment process, suitable for rapid on-site maintenance. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a partial enlarged view of the adjustment component according to an embodiment of the present invention; Detailed Implementation

[0017] This utility model embodiment provides a cable protection device, such as... Figure 1-2 As shown: The device includes a cable reel 3 and a protective cylinder 2. A cable passage 21 for the power supply cable is located at the center of the protective cylinder 2, allowing the cable to pass smoothly and avoiding friction during transport. One end of the protective cylinder 2 is embedded in a conduit, with its outer surface forming a tight fit with the inner surface of the conduit, ensuring that the device will not come loose due to external force during cable installation. The cable reel 3 is fixed to the other end of the protective cylinder 2 and is used to guide the movement of the cable. As a common component in the prior art, the cable reel 3 is rotatable to reduce cable traction resistance.

[0018] The outer surface of the protective cylinder 2 is provided with a deformation groove 24, which extends from the end face where the wire feeding wheel 3 is fixed to the end face that mates with the pipe. The deformation groove 24 allows one end of the protective cylinder 2 to deform elastically, thereby better forming an expansion fit with pipes of different inner diameters and enhancing adaptability. A positioning ring 25 is provided at the end of the protective cylinder 2 where the wire feeding wheel 3 is fixed. The positioning ring 25 is arranged around the outer surface of the protective cylinder 2 and avoids the deformation groove 24 to prevent the positioning ring 25 from interfering with the function of the deformation groove 24. Fixing plates 251 are symmetrically arranged on both sides of the positioning ring 25. The fixing plates 251 are used to fix the wire feeding wheel 3 and ensure that the wire feeding wheel 3 is not squeezed when the protective cylinder 2 deforms.

[0019] An adjustment assembly 26 is provided on the outer surface of the protective cylinder 2 at one end where the wire feeding wheel 3 is fixed, for adjusting the width of the deformation groove 24. The adjustment assembly 26 includes a backing plate 261, an adjusting plate 262, and an adjusting bolt 263. The backing plate 261 and the adjusting plate 262 are both fixed to the outer surface of the protective cylinder 2 and are located on both sides of the deformation groove 24. The adjusting bolt 263 cooperates with the adjusting plate 262 and can move toward or away from the backing plate 261. An operating head 264 is provided on the end of the adjusting bolt 263 exposed outside the protective cylinder 2, which facilitates manual operation to adjust the width of the deformation groove 24.

[0020] During cable transport, the cable enters the pipe through the cable passage 21. The cable passage 21 of the protective cylinder 2 shields the sharp edges of the pipe opening, preventing the cable from being scratched or damaged. The protective cylinder 2 is fixed inside the pipe by an expansion joint, providing stable support. The elastic design of the deformation groove 24 allows one end of the protective cylinder to adapt to changes in the inner diameter of the pipe. By operating the operating head 264 of the adjusting bolt 263, the width of the deformation groove 24 can be adjusted, thereby controlling the force of the expansion joint and facilitating the insertion or removal of the device from the pipe. The positioning ring 25 and the fixing plate 251 absorb the deformation force, protecting the cable delivery reel 3 from being affected and ensuring smooth cable guidance.

[0021] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A cable protection device, comprising a cable reel, characterized in that: It also includes a protective cylinder, which has a cable passage at the center for the power supply cable to pass through. One end of the protective cylinder is embedded in the pipe, and the outer surface of the portion of the protective cylinder embedded in the pipe forms an expansion fit with the inner surface of the pipe. The cable reel is fixed to the other end of the protective cylinder.

2. The cable protection device according to claim 1, characterized in that: The outer surface of the protective cylinder is provided with a deformation groove extending from the end face where the wire feeding wheel is fixed to the end face that mates with the pipe.

3. The cable protection device according to claim 2, characterized in that: The protective cylinder has a positioning ring at one end where the wire feeding reel is fixed, and fixing plates for fixing the wire feeding reel are symmetrically arranged on both sides of the positioning ring; the positioning ring is arranged around the outer surface of the protective cylinder and is arranged to avoid the deformation groove.

4. The cable protection device according to claim 2, characterized in that: The protective cylinder has an adjustment component on the outer surface of the end where the wire feeding wheel is fixed. The adjustment component is used to adjust the width of the deformation groove.

5. The cable protection device according to claim 4, characterized in that: The adjustment assembly includes a backing plate, an adjustment plate, and an adjustment bolt. The backing plate and the adjustment plate are both fixed to the outer surface of the protective cylinder and are located on both sides of the deformation groove. The adjustment bolt cooperates with the adjustment plate and can move toward or away from the backing plate. An operating head is provided at the end of the adjustment bolt that is exposed outside the protective cylinder.

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