A cable pulling head

Abstract

This application relates to a cable pulling head, which includes a fixed joint and a movable joint. The movable joint is sleeved on one end of the fixed joint and threadedly engaged with it. The end of the cable passes between the fixed joint and the movable joint. A locking component is provided between the fixed joint and the movable joint to restrict cable movement. A connecting member for facilitating pulling of the fixed joint is installed at the other end of the fixed joint. This application improves the applicability of the cable pulling head.

Description

Technical Field

[0001] This application relates to the field of cable traction technology, and in particular to a cable traction head. Background Technology

[0002] Cable pulling heads can be efficiently towed using mechanical traction equipment (such as winches and conveyors), significantly reducing manpower requirements. In complex environments such as tunnels and utility tunnels, their tensile design can withstand greater tension, reducing the risk of construction interruptions and minimizing safety accidents caused by cable slippage or breakage. By reinforcing the cable end, the pulling head evenly distributes the traction force to the conductor and sheath, preventing direct pulling that could lead to insulation damage, conductor deformation, or armor breakage, effectively preventing permanent damage caused by mechanical stress concentration. By reducing hidden damage during laying, the pulling head avoids potential defects such as partial discharge and insulation aging from the source, laying the foundation for the long-term stable operation of the cable system.

[0003] Chinese Patent No. CN222191647U discloses a single-core high-voltage cable pulling head, which includes a fixed shell. A crosshead screw is installed on one side of the upper end of the fixed shell, and a second crosshead screw is installed on the lower part of one side wall of the fixed shell. A connecting sleeve is connected to the locking end of both the first and second crosshead screws. The advantages are: through the coordinated design of the first and second crosshead screws, a linkage plate, a rubber pressure plate, a rubber pad, a guide groove, and a guide block, this utility model enables the single-core high-voltage cable pulling head to not only conveniently clamp and fix cables of different sizes during use, greatly improving the flexibility of the pulling head, but also to lock and fix the cable end in a double-locking manner, effectively avoiding the risk of the cable slipping and falling off relative to the pulling head during the pulling process, thus improving the pulling efficiency of the pulling head on the cable.

[0004] Regarding the aforementioned technologies, existing technologies utilize Phillips screws one and two to restrict the cable through the cooperation of a rubber pressure plate and a rubber pad, thereby securing the cable end within the fixed housing. However, in existing technologies, the mounting cavity within the fixed housing is designed with a corner. When the cable end encounters the corner of the mounting cavity, it presses against the vertical side wall of the mounting cavity. Since the rubber pad protrudes from the side wall surface of the mounting cavity, the cable end will abut against the rubber pad, making it difficult to enter between the rubber pressure plate and the rubber pad operated by Phillips screw two. This requires workers to use other tools to manipulate the cable end, which is cumbersome. Furthermore, bending the cable can easily damage the internal conductors, reducing the applicability of the cable pulling head. Summary of the Invention

[0005] To improve the applicability of cable pulling heads, this application provides a cable pulling head.

[0006] The cable pulling head provided in this application adopts the following technical solution:

[0007] A cable pulling head includes a fixed joint and a movable joint. The movable joint is sleeved on one end of the fixed joint and threadedly engaged with the fixed joint. The end of the cable passes between the fixed joint and the movable joint. A locking component is provided between the fixed joint and the movable joint to restrict the movement of the cable. A connector for facilitating pulling of the fixed joint is installed on the other end of the fixed joint.

[0008] By adopting the above technical solution, during installation, the cable is threaded through the movable joint, then the movable joint is threaded onto the fixed joint, and finally the cable is secured using the locking assembly, thus achieving cable end installation. The cooperation between the fixed and movable joints keeps the cable end straight, reducing the possibility of damage to the internal conductors compared to existing technologies. The locking assembly further reduces the overall installation steps, and the cable traction head can be disassembled and reused, improving its applicability.

[0009] Optionally, the locking assembly includes a shrink ring. The sidewalls of the fixed joint and the movable joint are provided with pressure-applying arc surfaces. Taking the axis of the fixed joint to the inner wall of the fixed joint as a reference direction, the distance between the two pressure-applying arc surfaces gradually decreases. The shrink ring is located between the two pressure-applying arc surfaces and is provided with a shrink notch. When locking the cable, the two pressure-applying arc surfaces apply pressure to the shrink ring, and the shrink ring deforms and squeezes the cable.

[0010] By adopting the above technical solution, when locking the cable, the moving joint applies pressure to the shrink ring, causing the shrink ring to change until the shrink ring squeezes the cable surface, thereby increasing the friction between the shrink ring and the cable and achieving the effect of locking the cable.

[0011] Optionally, the inner ring wall of the shrink ring is provided with a plurality of protruding rings.

[0012] By adopting the above technical solution, the convex ring is used to further increase the friction between the shrink ring and the cable, thereby further improving the cable locking effect.

[0013] Optionally, the locking assembly includes a fixing ring, a pressing arc block, a moving block, and a return spring. The fixing ring is connected to the end of the fixed connector, and the end of the fixing ring away from the fixed connector is provided with an abutting arc surface. The moving block slides on the moving connector with several blocks, and the moving direction of the moving block coincides with the radial direction of the moving connector. The pressing arc block is connected to the moving block, and the pressing arc block is provided with a contact arc surface for abutting the abutting arc surface. The return spring is installed inside the moving connector and located between the moving block and the moving connector. When locked, the cable is locked between the several pressing arc blocks.

[0014] By adopting the above technical solution, when locking the cable, the movable joint is threaded onto the fixed joint. During this process, the contact arc surface on the fixed ring applies pressure to the squeezing arc block, causing the movable block to move. The return spring is compressed until the squeezing arc block presses against the cable surface, thereby restricting the cable's degree of freedom and realizing cable installation. When releasing, the movable joint is released, and the movable block moves in the opposite direction under the force of the return spring, causing the squeezing arc block to disengage from the cable, thus releasing the cable.

[0015] Optionally, the fixed joint is threaded with a lock nut, which abuts against the movable joint.

[0016] By adopting the above technical solution, the locking nut is used to apply pressure to the movable joint, thereby increasing the friction between the movable joint and the fixed joint and reducing the possibility of the movable joint being loosened by vibration.

[0017] Optionally, the connector is a pull ring, and the threaded portion of the connector is threaded into the other end of the fixed joint.

[0018] By adopting the above technical solution, the pull ring is used for quick connection of the fixed joint, which is simple and convenient to operate and improves the traction operability of the fixed joint.

[0019] Optionally, the inner ring wall of the extrusion arc block is connected with several fixed flanges.

[0020] By adopting the above technical solution, the fixed flange is used to increase the friction between the extrusion arc block and the cable, reducing the possibility of cable movement.

[0021] Optionally, the movable joint is provided with a pre-tightening assembly, which includes a rotating ring, a pre-tightening column, a limiting block, and a pre-tightening arc block. A connecting block is connected to the movable joint, and a pre-tightening hole is opened on the connecting block. The limiting block is connected in the pre-tightening hole, and the pre-tightening column passes through the pre-tightening hole. A limiting groove is opened on the surface of the pre-tightening column, and the limiting groove is parallel to the pre-tightening column. The limiting block is slidably fitted in the limiting groove. The pre-tightening arc block is connected to the end of the pre-tightening column. The rotating ring is rotatably connected to the connecting block and is threadedly engaged with the pre-tightening column.

[0022] By adopting the above technical solution, when the movable joint is fitted onto the cable, in order to ensure that the cable end enters the fixed joint by a certain amount, it is necessary to initially secure the cable on the movable joint. During pre-tightening, the cable is threaded through the movable joint, and the rotating ring is turned. Due to the cooperation between the pre-tightening column and the rotating ring, and the cooperation between the pre-tightening column and the limiting block, the pre-tightening column moves from its original state until the end of the pre-tightening column presses the cable, thus achieving the initial connection between the cable and the movable joint.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. During installation, the cable is threaded through the movable joint, then the movable joint is threaded onto the fixed joint, and finally the locking assembly is used to secure the cable end, thus completing the installation. The cooperation between the fixed and movable joints keeps the cable end straight, reducing the possibility of damage to the internal conductors compared to existing technologies. The locking assembly further reduces the overall installation steps, and the cable traction head can be disassembled and reused, improving its applicability.

[0025] 2. When tightening the cable, thread the movable connector onto the fixed connector. During this process, the contact arc surface on the fixed ring applies pressure to the squeezing arc block, causing the movable block to move. The return spring is compressed until the squeezing arc block presses against the cable surface, thereby restricting the cable's degree of freedom and enabling cable installation. When loosening, release the movable connector. The movable block moves in the opposite direction under the force of the return spring, causing the squeezing arc block to disengage from the cable, thus releasing the cable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the cable traction head in Embodiment 1 of this application.

[0027] Figure 2 This is an exploded view used to illustrate the structure of the traction head in Embodiment 1 of this application.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 This is a cross-sectional view used to illustrate the structure of the traction head in Embodiment 1 of this application.

[0030] Figure 5 This is a schematic diagram of the cable pulling head in Embodiment 2 of this application.

[0031] Figure 6 This is an exploded view used to illustrate the structure of the pre-tightening component in Embodiment 2 of this application.

[0032] Figure 7This is a cross-sectional view used to illustrate the pre-tightening component structure in Embodiment 2 of this application.

[0033] Figure 8 This is a cross-sectional view used to illustrate the structure of the locking assembly in Embodiment 2 of this application.

[0034] Figure 9 This is a schematic diagram of the locking component in Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 01, cable; 1, fixed connector; 11, lock nut; 12, connector; 2, movable connector; 3, locking assembly; 31, shrink ring; 311, shrink notch; 312, convex ring; 32, fixed ring; 33, compression arc block; 331, fixed flange; 34, movable block; 35, return spring; 4, pressure arc surface; 5, pre-tightening assembly; 51, rotating ring; 52, pre-tightening column; 521, limiting groove; 53, limiting block; 54, pre-tightening arc block. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-9 This application will be described in further detail.

[0037] Embodiment 1 of this application discloses a cable pulling head. (Refer to...) Figure 1 The cable pulling head includes a fixed connector 1 and a movable connector 2. The movable connector 2 is sleeved on one end of the fixed connector 1 and is threaded into the fixed connector 1. The cable 01 passes between the movable connector 2 and the fixed connector 1.

[0038] Reference Figure 2 , Figure 3 and Figure 4 A locking assembly 3 is provided between the fixed connector 1 and the movable connector 2. The locking assembly 3 includes a shrink ring 31. The shrink ring 31 has a shrink notch 311. Several protruding rings 312 are provided on the inner ring wall of the shrink ring 31 to increase the roughness of the inner ring wall of the shrink ring 31. The shrink ring 31 is located between the fixed connector 1 and the movable connector 2 and is sleeved on the cable 01. Both the fixed connector 1 and the movable connector 2 have pressure-applying arc surfaces 4 at their ends facing the shrink ring 31. Taking the axis of the movable connector 2 to the inner wall of the movable connector 2 as a reference direction, the distance between the two pressure-applying arc surfaces 4 gradually decreases, and the shrink ring 31 abuts against the two pressure-applying arc surfaces 4.

[0039] When locking cable 01, rotate the movable joint 2 to apply pressure to the two pressure-applying arc surfaces 4 on the shrink ring 31, causing the shrink ring 31 to deform and squeeze the surface of cable 01, thereby achieving the effect of fastening cable 01.

[0040] Reference Figure 1 and Figure 2To reduce the possibility of the movable joint 2 being loosened by vibration, a locking nut 11 is threaded onto the fixed joint 1, and the locking nut 11 abuts against the movable joint 2. The locking nut 11 is used to increase the friction between the movable joint 2 and the fixed joint 1, thereby reducing the possibility of the movable joint 2 being loosened by vibration.

[0041] Reference Figure 1 and Figure 3 The other end of the fixed joint 1 is provided with a connector 12, which is a pull ring, and the connector 12 is threaded onto the other end of the fixed joint 1. The pull ring facilitates the assembly and traction operation of the fixed joint 1.

[0042] The implementation principle of a cable pulling head in Embodiment 1 of this application is as follows: During installation, the cable 01 is passed through the movable joint 2 and the shrink ring 31. Then, the movable joint 2 is threaded onto the fixed joint 1. The two pressure arc surfaces 4 press against the shrink ring 31, causing the shrink ring 31 to deform and squeeze the cable 01 to restrict the cable 01. Then, the locking nut 11 is rotated to press against the movable joint 2. Finally, the connector 12 is threaded onto the other end of the fixed joint 1, thus realizing the installation of the cable 01 pulling head.

[0043] By using the fixed connector 1 and the movable connector 2, the end of the cable 01 is kept straight, which reduces the possibility of damage to the internal conductors of the cable 01 compared to the prior art. At the same time, by squeezing the shrink ring 31 to restrict the cable 01, the overall installation steps are reduced, which improves the installation efficiency of the cable 01 traction head. In addition, the traction head components can be disassembled and reused, which improves the applicability of the cable 01 traction head.

[0044] Example 2: The difference between this example and Example 1 is that the structure of the locking component 3 is different, and a pre-tightening component 5 for pre-tightening cable 01 is added.

[0045] Reference Figure 5 , Figure 6 and Figure 7 The pre-tightening assembly 5 includes a rotating ring 51, a pre-tightening post 52, a limiting block 53, and a pre-tightening arc block 54. A connecting block is fixedly connected to the end of the movable joint 2 away from the fixed joint 1. A pre-tightening hole is formed on the connecting block, and the limiting block 53 is fixedly connected within the pre-tightening hole. The pre-tightening post 52 passes through the pre-tightening hole and has a limiting groove 521. The limiting groove 521 is parallel to the pre-tightening post 52 and slides in engagement with the limiting block 53. The rotating ring 51 is rotatably connected to the connecting block and threadedly engaged with the pre-tightening post 52.

[0046] Reference Figure 8 and Figure 9The locking assembly 3 includes a fixed ring 32, a pressing arc block 33, a moving block 34, and a return spring 35. The fixed ring 32 is fixedly connected to the end of the fixed joint 1, and has an abutting arc surface. The moving joint 2 has several sliding grooves, six in this embodiment, which coincide with the radial direction of the moving joint 2 and are T-shaped grooves. The moving block 34 slides within the sliding grooves, and a stop block is fixedly connected to the opening of the sliding groove. The return spring 35 is installed between the moving block 34 and the stop block. The pressing arc block 33 is fixedly connected to the moving block 34, and has a contact arc surface. Several fixing flanges 331 are fixedly connected to the inner ring wall of the pressing arc block 33, which are used to increase the friction of the pressing arc block 33.

[0047] When installing cable 01, cable 01 is threaded through movable connector 2. Then, rotating ring 51 is turned. Through the cooperation of pre-tightening column 52 and limiting block 53, and the cooperation of pre-tightening column 52 and rotating ring 51, the pre-tightening column 52 moves from its original state until the end of the pre-tightening column 52 presses against cable 01 to pre-tighten cable 01. Then, movable connector 2 is threaded onto fixed connector 1. During this process, the pressing arc block 33 abuts against the abutting arc surface on fixed ring 32, causing the pressing arc block 33 to move. The return spring 35 is compressed until the fixed flange 331 presses against the surface of cable 01, thus realizing the installation of cable 01 pulling head.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cable pulling head, characterized in that: It includes a fixed connector (1) and a movable connector (2). The movable connector (2) is sleeved on one end of the fixed connector (1) and threadedly engaged with the fixed connector (1). The end of the cable (01) passes between the fixed connector (1) and the movable connector (2). A locking component (3) is provided between the fixed connector (1) and the movable connector (2) to restrict the movement of the cable (01). A connector (12) for facilitating the pulling of the fixed connector (1) is installed on the other end of the fixed connector (1).

2. The cable pulling head according to claim 1, characterized in that: The locking assembly (3) includes a shrink ring (31). The fixed joint (1) and the movable joint (2) are provided with pressure arc surfaces (4) on their opposite side walls. The distance between the two pressure arc surfaces (4) gradually decreases from the axis of the fixed joint (1) to the inner wall of the fixed joint (1) as the reference direction. The shrink ring (31) is located between the two pressure arc surfaces (4). The shrink ring (31) is provided with a shrink notch (311). When locking the cable (01), the two pressure arc surfaces (4) press the shrink ring (31), and the shrink ring (31) deforms and squeezes the cable (01).

3. The cable pulling head according to claim 2, characterized in that: The inner ring wall of the shrink ring (31) is provided with a plurality of protruding rings (312).

4. The cable pulling head according to claim 1, characterized in that: The locking assembly (3) includes a fixed ring (32), a pressing arc block (33), a moving block (34), and a return spring (35). The fixed ring (32) is connected to the end of the fixed connector (1). The end of the fixed ring (32) away from the fixed connector (1) is provided with an abutting arc surface. The moving block (34) slides on the moving connector (2) in several blocks. The moving direction of the moving block (34) coincides with the radial direction of the moving connector (2). The pressing arc block (33) is connected to the moving block (34). The pressing arc block (33) is provided with a touching arc surface for abutting the abutting arc surface. The return spring (35) is installed inside the moving connector (2) and is located between the moving block (34) and the moving connector (2). When locked, the cable (01) is locked between several pressing arc blocks (33).

5. The cable pulling head according to claim 1, characterized in that: The fixed joint (1) is threaded with a locking nut (11), which abuts against the movable joint (2).

6. The cable pulling head according to claim 1, characterized in that: The connector (12) is a pull ring, and the threaded part on the connector (12) is threaded into the other end of the fixed joint (1).

7. The cable pulling head according to claim 4, characterized in that: The inner ring wall of the extrusion arc block (33) is connected with several fixed flanges (331).

8. The cable pulling head according to claim 1, characterized in that: The movable joint (2) is provided with a pre-tightening component (5), which includes a rotating ring (51), a pre-tightening column (52), a limiting block (53), and a pre-tightening arc block (54). The movable joint (2) is connected to a connecting block, which has a pre-tightening hole. The limiting block (53) is connected to the pre-tightening hole, and the pre-tightening column (52) passes through the pre-tightening hole. The surface of the pre-tightening column (52) has a limiting groove (521), which is parallel to the pre-tightening column (52). The limiting block (53) is slidably fitted in the limiting groove (521). The pre-tightening arc block (54) is connected to the end of the pre-tightening column (52). The rotating ring (51) is rotatably connected to the connecting block and is threadedly fitted with the pre-tightening column (52).

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