Cable strand breaking and pulling tool

Abstract

The utility model discloses a cable breaking and pulling tool belongs to the cable installation field. Its technical scheme is, a kind of cable breaking and pulling tool, including clamping rod, the front end of the clamping rod is equipped with conical cover, the top of conical cover is connected with the end of the clamping rod, the bottom of conical cover is open setting, the clamping rod is located on the axis of conical cover;The clamping rod includes hollow section, the hollow section is located at the front of clamping rod, the inner chamber of hollow section is communicated with the inside of the conical cover, the pipe wall of the hollow section is threadedly installed with multiple locking bolts, the screw rod end of the locking bolt is located in the inner chamber of hollow section.This tool when fixing cable, cable end does not occur bending, reduce the stress of core, cable can keep flat state after being pulled out from tool, simultaneously, cable is fixed on the rotary axis of hand gun drill, the whole operating process is more stable, reduces the shaking.

Description

Technical Field

[0001] This utility model relates to the field of cable installation, and in particular to a cable strand breaking and stretching tool. Background Technology

[0002] Control cables serve as the medium for transmitting analog signals in the secondary circuits of substations, playing a crucial role in the communication between secondary equipment within the substation. A control cable primarily consists of three parts: the innermost layer of secondary cable cores, the middle layer of aluminum armor encasing the secondary cable cores, and the outermost insulation layer. The innermost cable cores are the most important component of the secondary cable, typically arranged in a twisted configuration, and are primarily responsible for transmitting electrical quantities.

[0003] The main cables in the cable layers and cable trenches of substations are armored control cables. After entering the cabinet, the outer insulation and aluminum armor of the cables need to be removed, leaving only the secondary cable cores, which are then connected to the correct positions. Because the cable cores, freshly stripped of their outer insulation and armor, are twisted, making wiring difficult and aesthetically unappealing, in practice, wiring personnel manually rotate clockwise to break each wire individually, then use pliers to clamp and straighten each core. Due to the large number of secondary cables, each containing 4-21 cores, manually breaking and straightening the wires is extremely labor-intensive and inefficient.

[0004] To address the inefficiency of manual wire breaking and stretching, workers have designed auxiliary tools, such as patent CN213559633U, which discloses a special straightening tool for cable cores. This tool mainly includes a ring and a rod. The cable passes through the ring and is fixed through a notch on the ring. Then, the rod is clamped onto a pistol drill, and the rotation of the pistol drill is used to achieve automatic strand breaking.

[0005] However, in this tool, the end of the cable connected to the ring is bent at a 90-degree angle to the other cable parts. After the cable is removed, due to the release of internal stress in the copper wire, the multiple wire cores at the end of the cable become messy and disordered, which is not conducive to subsequent wiring. In addition, the cable passes vertically through the ring, but the rotation axis of the ring is one of its own diameters. When rotating, the cable and the shaft of the pistol drill are not collinear, causing the pistol drill to swing back and forth, making it difficult for the operator to hold. Summary of the Invention

[0006] This invention addresses the problems of excessive cable end spreading and poor compatibility with hand drills caused by current cable core breaking and straightening tools, and provides a more practical, effective, and better-fitting cable breaking and stretching fixture.

[0007] To solve the above problems, the technical solution adopted by this utility model is a cable strand breaking and stretching fixture, including a clamping rod. The front end of the clamping rod is provided with a conical cover, the apex of which is connected to the end of the clamping rod, and the bottom of which is open. The clamping rod is located on the axis of the conical cover. The clamping rod includes a hollow section located at the front of the clamping rod. The inner cavity of the hollow section communicates with the interior of the conical cover. Multiple locking bolts are threaded onto the wall of the hollow section, with the screw ends of the locking bolts located within the inner cavity of the hollow section. When fixing the cable, this fixture prevents the cable end from bending, reducing stress on the core. After the cable is removed from the fixture, the end remains flat. Simultaneously, the cable is fixed on the rotation axis of the hand drill, making the entire operation more stable and reducing vibration.

[0008] As a preferred embodiment of a cable strand breaking and stretching fixture, the clamping rod further includes a solid section located behind the hollow section and coaxially aligned with it. The solid section has sufficient strength to facilitate clamping by a pistol drill chuck, preventing fixture deformation due to clamping force, while also providing rear-end support for the hollow section to ensure overall structural stability.

[0009] As a preferred implementation of a cable strand breaking and stretching fixture, multiple locking bolts are evenly distributed circumferentially on the clamping rod. The locking bolts ensure uniform circumferential force on the cable, preventing cable misalignment or localized damage during fixing and improving fixing reliability.

[0010] As a preferred embodiment of a cable strand breaking and stretching fixture, the inner cavity of the hollow section is conical, with the bottom of the conical cavity connecting to the top of the conical cover. The conical inner cavity and the conical cover form a gradual channel, which guides the cable cores towards the top of the cone, making the cores more compact in the circumferential direction, enhancing the fixing strength, and facilitating better clamping when the locking bolts are applied.

[0011] As a preferred embodiment of a cable strand breaking and stretching fixture, the axis of the locking bolt is inclined relative to the axis of the clamping rod, the screw end of the locking bolt is close to the rear end of the clamping rod, and the bolt head is close to the front end of the clamping rod. The locking bolt is driven in the opposite direction to the cable pulling out direction, which can further press the cable end into the cone apex region of the hollow section when tightening. This not only enhances the pull-out resistance and prevents the cable from accidentally coming out, but also makes the core more tightly fitted through the inclined force, improving the fixing stability.

[0012] As a preferred embodiment of a cable strand breaking and stretching fixture, a scratch-resistant ring is fixedly provided on the bottom edge of the conical cover. The cross-section of the scratch-resistant ring is circular, and the diameter of the circle is greater than the thickness of the sidewall of the conical cover at the bottom. The scratch-resistant ring creates a smooth structure at the bottom edge of the conical cover, preventing the copper core of the cable from being scratched by sharp edges when inserted, protecting the insulation layer and metal conductor of the core, and ensuring that the cable performance is not damaged.

[0013] As a preferred embodiment of a cable strand breaking and stretching fixture, the conical cover has a connecting ring at its apex. This connecting ring is fitted onto the outer front end of the clamping rod. A threaded hole is provided on the side wall of the connecting ring, and a grommet screw is threaded into the hole. The end of the grommet screw abuts against the outer wall of the clamping rod. This modular design facilitates the disassembly and replacement of the conical cover and clamping rod. The grommet screw's abutment against the outer wall of the clamping rod ensures reliable fixation, preventing the conical cover from detaching during the strand breaking process. It also allows for easy replacement of the appropriate conical cover according to different cable specifications.

[0014] As a preferred implementation of a cable strand breaking and stretching tool, the outer diameter of the solid section is larger than the outer diameter of the hollow section. The larger outer diameter of the solid section allows the pistol drill clamping force to be fully applied to the solid section, preventing deformation of the hollow section due to pressure. Simultaneously, the diameter difference creates a limiting structure, facilitating precise positioning and clamping of the pistol drill chuck, and improving operational stability.

[0015] As can be seen from the above technical solutions, the advantages of this utility model are as follows: The cable strand breaking and stretching fixture provided by this utility model, through the coaxial design of the clamping rod and the conical cover, keeps the end of the cable straight when fixed, reduces the stress on the wire core, and the end is flat after removal. Moreover, the fixture coincides with the rotation axis of the pistol drill, making the operation stable and less shaking. The solid section of the clamping rod enhances the strength when clamped by the pistol drill chuck, preventing the fixture from deforming. Its outer diameter, which is larger than that of the hollow section, can also concentrate the clamping force and facilitate positioning. The circumferentially evenly distributed locking bolts can make the cable bear the force evenly, improving the reliability of the fixation. The gradual channel formed by the conical inner cavity of the hollow section and the conical cover can guide the wire core to gather and enhance the fixation strength. With the locking bolts with the axis inclined, the cable end can be pressed into the cone top area when tightening, enhancing the pull-out resistance. The anti-scratch ring at the bottom of the conical cover can prevent the wire core from being scratched and protect the cable performance. The conical cover is connected to the clamping rod separately through the connecting ring and the nut screw, which is convenient for disassembly, assembly, and replacement to adapt to different specifications of cables. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0019] Figure 3 for Figure 1 A sectional view.

[0020] Explanation of main figure symbols 1. Clamping rod, 11. Solid section, 12. Hollow section, 2. Conical cover, 21. Connecting ring, 3. Locking bolt, 4. Anti-scratch ring, 5. Measuring screw. Detailed Implementation

[0021] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] like Figure 1-3 As shown, a cable strand breaking and stretching fixture includes a clamping rod 1 and a conical cover 2, to... Figure 3 The right end is the front end, and the conical cover 2 is installed at the front end of the clamping rod 1. The clamping rod 1 is located on the axis of the conical cover 2.

[0023] The clamping rod 1 includes a solid section 11 and a hollow section 12. The solid section 11 and the hollow section 12 are coaxially arranged, with the solid section 11 located behind the hollow section 12. The front end of the hollow section 12 is open. In use, the solid section 11 has sufficient strength to be clamped by the pistol drill's clamp. Furthermore, the outer diameter of the solid section 11 can be larger than the outer diameter of the hollow section 12, so that the clamping force of the pistol drill is fully applied to the solid section 11, preventing the hollow section 12 from being deformed by pressure. Multiple locking bolts 3 are threaded onto the wall of the hollow section 12. The screw ends of the locking bolts 3 are located in the inner cavity of the hollow section 12, and the multiple locking bolts 3 are evenly distributed in the circumferential direction of the clamping rod 1.

[0024] The cone apex of the conical cover 2 is connected to the end of the hollow section 12 of the clamping rod 1, and the cone bottom of the conical cover 2 is open, thus the inner cavity of the hollow section 12 communicates with the interior of the conical cover 2. A scratch-resistant ring 4 is fixedly provided along the edge of the cone bottom of the conical cover 2. The cross-section of the scratch-resistant ring 4 is circular, and the diameter of the circle is greater than the thickness of the sidewall of the conical cover 2 at the cone bottom. Therefore, the edge of the cone bottom of the conical cover 2 has a smooth structure, avoiding damage to the copper core of the cable.

[0025] The clamping rod 1 and the conical cover 2 are designed as separate units. Specifically, the conical cover 2 has a connecting ring 21 at its cone apex, and the connecting ring 21 is fitted onto the outside of the front end of the clamping rod 1. Figure 2 As shown, the side wall of the connecting ring 21 is provided with a threaded hole, and a grommet screw 5 is threadedly installed in the threaded hole. The end of the grommet screw 5 abuts against the outer wall of the clamping rod 1.

[0026] When using this tool, first assemble the clamping rod 1 and the conical cover 2. Insert the solid section 11 of the clamping rod 1 into the pistol drill and clamp it with the pistol drill's clamp. Then remove the outer sheath and armor of the cable, insert the end of the cable core into the hollow section 12 through the guide of the conical cover 2, tighten the locking bolt 3 to press and fix the cable, and then start the pistol drill. As the pistol drill rotates, the cable strands will be broken.

[0027] As can be seen, during the use of this fixture, the cable end remains basically collinear and straight with the rest of the cable, reducing the stress on the core. After the cable is removed from the fixture, the end can remain basically straight. At the same time, the cable is fixed on the rotation axis of the pistol drill, making the entire operation more stable and reducing vibration.

[0028] Furthermore, to improve the cable's fixing strength, the inner cavity of the hollow section 12 can be made conical, such as... Figure 3 As shown, the conical bottom of the inner cavity of the hollow section 12 connects to the conical top of the conical cover 2. Simultaneously, the axis of the locking bolt 3 is inclined relative to the axis of the clamping rod 1. The screw end of the locking bolt 3 is close to the rear end of the clamping rod 1, and the bolt head of the locking bolt 3 is close to the front end of the clamping rod 1. Therefore, the insertion direction of the locking bolt 3 is opposite to the cable extraction direction. During insertion, the cable end can be further pressed into the conical top region of the hollow section, making the cable end core more compact in the circumferential direction, while achieving a stronger pull-out resistance and preventing accidental cable pull-out.

[0029] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: the coaxial design of the clamping rod and the conical cover ensures that the cable end remains straight when fixed, reducing core stress and resulting in a flat end after removal. Furthermore, the tooling coincides with the rotation axis of the pistol drill, ensuring stable operation with minimal vibration. The solid section of the clamping rod enhances the strength when clamped by the pistol drill fixture, preventing tooling deformation. Its larger outer diameter than the hollow section also concentrates the clamping force and facilitates positioning. The evenly distributed locking bolts ensure uniform cable stress, improving fixation reliability. The gradual channel formed by the conical inner cavity of the hollow section and the conical cover guides the core to converge, enhancing fixation strength. Combined with the inclined locking bolts, the cable end is pressed into the cone apex area during tightening, enhancing pull-out resistance. The anti-scratch ring at the bottom of the conical cover prevents core scratches, protecting cable performance. The conical cover is connected to the clamping rod separately via a connecting ring and nut screws, facilitating disassembly, assembly, and replacement to accommodate different cable specifications.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cable strand breaking and stretching tool, comprising a clamping rod (1), characterized in that, The clamping rod (1) has a conical cover (2) at its front end. The cone top of the conical cover (2) is connected to the end of the clamping rod (1). The cone bottom of the conical cover (2) is open. The clamping rod (1) is located on the axis of the conical cover (2). The clamping rod (1) includes a hollow section (12). The hollow section (12) is located at the front of the clamping rod (1). The inner cavity of the hollow section (12) is connected to the inside of the conical cover (2). Multiple locking bolts (3) are threaded on the tube wall of the hollow section (12). The screw end of the locking bolt (3) is located in the inner cavity of the hollow section (12).

2. The cable strand breaking and stretching tool according to claim 1, characterized in that, The clamping rod (1) also includes a solid section (11), which is located at the rear end of the hollow section (12) and is collinear with the hollow section (12).

3. The cable strand breaking and stretching tool according to claim 2, characterized in that, The multiple locking bolts (3) are evenly distributed in the circumferential direction of the clamping rod (1).

4. The cable strand breaking and stretching tool according to claim 1, characterized in that, The inner cavity of the hollow section (12) is conical, and the bottom of the inner cavity of the hollow section (12) is connected to the top of the conical cover (2).

5. The cable strand breaking and stretching tool according to claim 4, characterized in that, The axis of the locking bolt (3) is inclined relative to the axis of the clamping rod (1), the screw end of the locking bolt (3) is close to the rear end of the clamping rod (1), and the bolt head of the locking bolt (3) is close to the front end of the clamping rod (1).

6. The cable strand breaking and stretching tool according to claim 1, characterized in that, The conical cover (2) has a fixed anti-scratch ring (4) at the bottom edge. The cross-section of the anti-scratch ring (4) is circular, and the diameter of the circle is greater than the thickness of the side wall of the conical cover (2) at the bottom of the cone.

7. The cable strand breaking and stretching tool according to claim 1, characterized in that, The cone-shaped cover (2) has a connecting ring (21) at the cone top. The connecting ring (21) is fitted onto the front end of the clamping rod (1). The side wall of the connecting ring (21) has a threaded hole. A granulator screw (5) is threaded into the threaded hole. The end of the granulator screw (5) abuts against the outer wall of the clamping rod (1).

8. The cable strand breaking and stretching tool according to claim 2, characterized in that, The outer diameter of the solid section (11) is larger than the outer diameter of the hollow section (12).

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