A high-tightness bidirectional self-locking tensioner

Abstract

This application relates to the field of tensioner technology, and in particular to a high-tightness bidirectional self-locking tensioner, comprising a main frame, a bidirectional self-locking assembly, and an adjustment drive assembly. The bidirectional self-locking assembly achieves forward and reverse self-locking through a wedge-shaped locking element engaging with a locking cavity; a return spring ensures automatic reset when no external force is applied; and a linkage gear ensures synchronous movement on both sides. The adjustment drive assembly uses a drive motor to rotate a threaded rod, and a limit block pushes an adjusting block to achieve precise adjustment. This application enhances stability and structural strength through guide grooves, sliders, and support arms; inlet and outlet holes facilitate installation; and a control panel provides a user-friendly interface. This application can maintain long-term stable locking performance under high load or vibration environments, meeting the needs of complex working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical fastening technology, specifically a high-fastening bidirectional self-locking tensioner. Background Technology

[0002] With the development of tensioner technology, various self-locking tensioning devices have been widely used in power, machinery, medical, and industrial equipment fields. However, existing tensioners still have significant shortcomings in achieving high tightness, bidirectional self-locking, and long-term stability. Especially under high load, vibration environments, or conditions requiring repeated adjustments, traditional tensioners are prone to loosening, insufficient locking force, or inconvenient operation, making it difficult to meet the demands of modern engineering for highly reliable and safe connection devices.

[0003] A search revealed a 10kV column-mounted porcelain insulator conductor self-locking device, publication number CN112653055B, published on June 17, 2022. This device uses a clamp to fix the transmission line and achieves self-locking through reciprocating pulling during clamping. The clamping structure automatically tightens the conductor when under stress, reducing conductor sway and fatigue damage. While this technical solution possesses a certain degree of self-locking function and can maintain a certain tension under external disturbances, its locking mechanism relies on manual reciprocating pulling action and lacks an active bidirectional locking structure, making automatic locking under both forward and reverse forces impossible. Furthermore, this device is only suitable for unidirectional tensioning scenarios and lacks bidirectional adjustment and force equalization capabilities. Under complex dynamic loads or bidirectional vibration and impact, the locking reliability significantly decreases, making it difficult to meet the application requirements for high-tightness bidirectional self-locking.

[0004] A search revealed a wellhead docking device and a method for completing ultra-short radius sidetracking horizontal wells, with publication number CN117569751B, published on April 5, 2024. This device employs a plug-in locking assembly in conjunction with a synchronous tensioning and unlocking assembly to achieve automatic docking and locking of the upper and lower connectors. The locking assembly has vertical clearance to automatically adapt to positional deviations during docking and achieves locking through mechanical locking. While this structure possesses a certain degree of automatic adaptability and mechanical locking capability, its locking direction is unidirectional axial compression, lacking a bidirectional self-locking mechanism. Furthermore, the unlocking and locking actions rely on external drive synchronous control, lacking an independent bidirectional anti-loosening mechanism. More importantly, this device emphasizes rapid docking and separation; its locking structure is prone to wear and tear under long-term high stress conditions, leading to a decrease in locking force and failing to guarantee stable self-locking performance under sustained high tightness. It also lacks adaptive locking capability under bidirectional tensile or alternating loads.

[0005] The aforementioned problems indicate that existing self-locking tensioning devices are mostly limited to unidirectional locking, manual operation, or temporary fixation under specific working conditions. They generally lack a mechanical structure capable of automatic triggering under bidirectional force, highly reliable self-locking, and maintaining long-term high tightness. Especially in scenarios requiring vibration resistance, fatigue resistance, and reusability, existing solutions struggle to balance ease of operation with locking safety.

[0006] Therefore, this utility model provides a high-tightness bidirectional self-locking tensioner, which aims to overcome the defects of existing technologies such as single locking direction, poor self-locking reliability, and weak anti-disturbance ability. Through the innovative design of the bidirectional linkage self-locking mechanism, it can automatically trigger locking when subjected to force in either the tensile or compressive direction, significantly improving the safety, stability, and applicability of the connection device. Utility Model Content

[0007] This utility model relates to a high-tightness bidirectional self-locking tensioner, comprising a main frame, a bidirectional self-locking assembly, and an adjustment drive assembly. The bidirectional self-locking assembly is installed within the main frame, and the adjustment drive assembly is fixedly connected to one outer wall of the main frame. The bidirectional self-locking assembly includes a rack, a slider, a wedge-shaped locking element, a return spring, a guide groove, a linkage gear, and a locking cavity. Guide grooves are symmetrically formed within the main frame, and a slider is slidably connected within the guide grooves. A rack is fixedly connected to one outer wall of the slider, and linkage gears mesh between the racks. A linkage gear is rotatably connected to the inner wall of the middle section of the main frame. A wedge-shaped locking element is fixedly connected to one outer wall of the slider, with an inclined surface on one side and a flat surface on the other side. A return spring is fixedly connected to one outer wall of the wedge-shaped locking element, and the other end of the return spring is fixedly connected to the inner wall of the main frame. Locking cavities are symmetrically formed at both ends of the main frame, and these cavities cooperate with the wedge-shaped locking elements.

[0008] The adjustment drive assembly includes a drive motor, a transmission shaft, a threaded rod, a limit block, and an adjustment block. The drive motor is fixedly connected to one outer wall of the main frame. The top of the output shaft of the drive motor is fixedly connected to the transmission shaft. A threaded rod is fixedly connected to one outer wall of the transmission shaft. A limit block is threadedly connected to the outer wall of the threaded rod. An adjustment block is fixedly connected to one outer wall of the limit block. One end of the adjustment block is slidably connected to the inner wall of the main frame. An inclined surface is provided on one outer wall of the adjustment block, and the inclined surface of the adjustment block is in contact with the inclined surface of the wedge-shaped locking member.

[0009] A wire inlet hole is provided on one side of the outer wall of the main frame, and a wire outlet hole is provided on the other side of the outer wall of the main frame, with the outlet hole located opposite to the wire inlet hole. Support arms are symmetrically fixedly connected to the two outer walls of the main frame, and a control panel is mounted on one end of each support arm. Operation buttons are distributed on one side of the outer wall of the control panel. Two return springs are sleeved on the outer wall of the wedge-shaped locking member. One flat side of the wedge-shaped locking member is tightly fitted to the inner wall of the locking cavity, and the inclined surface of the wedge-shaped locking member forms an angle with the inclined surface of the adjusting block.

[0010] This invention utilizes a bidirectional self-locking component design, enabling the wedge-shaped locking element to automatically trigger a locking action based on the direction of force under both forward and reverse force. When the tensioner is subjected to tensile force, the adjusting block moves along the threaded rod and pushes the wedge-shaped locking element to slide towards the locking cavity, with one side of the wedge-shaped locking element fitting against the inner wall of the locking cavity, forming a locked state. When the tensioner is subjected to compressive force, the wedge-shaped locking element returns to its original position under the action of the return spring, and drives the wedge-shaped locking element on the other side to move synchronously through the linkage gear, achieving reverse locking.

[0011] This invention achieves precise adjustment of the tensioner through the design of the adjustment drive assembly. The drive motor rotates the transmission shaft, causing the threaded rod to rotate. The limit block moves along the threaded rod and pushes the adjustment block to slide. The inclined surface of the adjustment block interacts with the inclined surface of the wedge-shaped locking element to complete the locking or unlocking action. This design avoids the limitations of traditional tensioners that rely on manual operation, while improving the convenience and precision of adjustment.

[0012] This invention ensures the stability of the wedge-shaped locking component during movement through the cooperation of the guide groove and the slider within the main frame. The slider slides within the guide groove, restricting the movement trajectory of the wedge-shaped locking component and preventing it from deviating or jamming, thereby improving the reliability and service life of the tensioner.

[0013] This invention achieves a high-tightness, bidirectional self-locking function through the cooperation of the locking cavity and the wedge-shaped locking element. The inner wall of the locking cavity fits tightly against the flat side of the wedge-shaped locking element, forming a stable mechanical locking structure that can maintain long-term stable locking performance under high load, vibration environment, or alternating load conditions.

[0014] This invention utilizes a return spring design to ensure that the wedge-shaped locking element automatically resets when no external force is applied. The elastic force of the return spring keeps the wedge-shaped locking element in its initial position, preventing locking failure due to external vibration or impact, and further improving the tensioner's resistance to disturbances.

[0015] This invention achieves synchronized operation of the bidirectional self-locking assembly through the design of a linkage gear. The linkage gear links the movement of the racks on both sides, ensuring consistent movement of the wedge-shaped locking parts on both sides, avoiding locking failure due to uneven force on one side, and enhancing the overall performance of the tensioner.

[0016] This invention provides an intuitive user interface through the design of a control panel and operation buttons, facilitating parameter settings and function selection. The control panel is electrically connected to the drive motor, allowing users to start or stop the drive motor via the operation buttons, thus achieving automated adjustment of the tensioner.

[0017] This invention facilitates the connection between the tensioner and external components through the design of the inlet and outlet holes. The inlet and outlet holes are located on opposite sides of the main frame, allowing for quick installation and disassembly of the tensioner in practical applications, thus improving its applicability and ease of operation.

[0018] This invention enhances the structural strength of the main frame through the design of support arms. The support arms are fixedly connected to the outer walls on both sides of the main frame, not only providing support but also distributing external loads, preventing deformation or damage to the main frame due to long-term use, and extending the service life of the tensioner.

[0019] This invention, through the design of the above-described technical solution, solves the shortcomings of existing tensioners in terms of high tightness, bidirectional self-locking, and long-term stability. The combination of the bidirectional self-locking component and the adjustment drive component enables the tensioner to achieve highly reliable self-locking under complex working conditions, meeting the needs of modern engineering for highly safe connection devices. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention, showing the overall layout of the main frame, the bidirectional self-locking assembly, and the adjustment drive assembly, as well as the positional relationship of the external connecting components.

[0021] Figure 2 This is a schematic diagram of the outer structure of the support arm.

[0022] Figure 3 for Figure 1 A magnified diagram of region A.

[0023] Figure 4 for Figure 1 A magnified diagram of region B.

[0024] The attached diagram is labeled as follows: 1. Main frame; 2. Two-way self-locking assembly; 3. Adjustment drive assembly; 4. Rack; 5. Slider; 6. Wedge-shaped locking element; 7. Return spring; 8. Guide groove; 9. Linkage gear; 10. Locking cavity; 11. Drive motor; 12. Threaded rod; 13. Limit block; 14. Adjustment block; 15. Inlet hole; 16. Outlet hole; 17. Support arm; 18. Control panel; 19. Operation button. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Specific implementation examples are given below.

[0027] like Figures 1 to 4 As shown, this utility model provides a high-tightness bidirectional self-locking tensioner, which mainly includes a main frame 1, a bidirectional self-locking component 2, and an adjustment drive component 3. The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] The main frame 1 is the foundation of the overall structure, and its internal design incorporates a spatial layout of multiple mating components. Guide grooves 8 are symmetrically formed on the inner walls of both sides of the main frame 1. The guide grooves 8 are rectangular in shape and extend along the length of the main frame 1, with their width matching the outer contour of the slider 5, ensuring that the slider 5 can slide smoothly within the guide grooves 8 without deviation or jamming. The outer wall of the slider 5 maintains a tight fit with the inner wall of the guide groove 8 to achieve precise guidance. A rack 4 is fixedly connected to one outer wall of the slider 5, with its teeth facing the center of the main frame 1 and meshing with a linkage gear 9. The linkage gear 9 is rotatably connected to the inner wall of the center of the main frame 1 via a rotating shaft, with its two sides meshing with the rack 4, thereby linking the movements of the racks 4 on both sides to achieve synchronized action.

[0029] A wedge-shaped locking element 6 is fixedly connected to the outer wall of one end of the slider 5. One side of the wedge-shaped locking element 6 has an inclined surface, and the other side is a flat surface. The inclined surface of the wedge-shaped locking element 6 is used to form an angle fit with the inclined surface of the adjusting block 14, while its flat side is tightly fitted with the inner wall of the locking cavities 10 symmetrically opened at both ends of the main frame 1, forming a mechanical locking structure. A return spring 7 is sleeved on the outer wall of the wedge-shaped locking element 6, with one end fixedly connected to one side of the outer wall of the wedge-shaped locking element 6 and the other end fixedly connected to the inner wall of the main frame 1. There are two return springs 7, corresponding to the wedge-shaped locking elements 6 on both sides respectively. Their elastic force allows the wedge-shaped locking elements 6 to automatically return to their initial position when no external force is applied.

[0030] The adjustment drive assembly 3 includes a drive motor 11, a transmission shaft, a threaded rod 12, a limiting block 13, and an adjusting block 14. The drive motor 11 is fixedly connected to one outer wall of the main frame 1, with the transmission shaft fixedly connected to the top of its output shaft. A threaded rod 12 is fixedly connected to the outer wall of one end of the transmission shaft. A limiting block 13 is threadedly connected to the outer wall of the threaded rod 12, and an adjusting block 14 is fixedly connected to one outer wall of the limiting block 13. One end of the adjusting block 14 is slidably connected to the inner wall of the main frame 1, and an inclined surface is provided on its other outer wall, which fits against the inclined surface of the wedge-shaped locking member 6. When the drive motor 11 starts, the transmission shaft drives the threaded rod 12 to rotate, and the limiting block 13 moves axially along the threaded rod 12, thereby pushing the adjusting block 14 to slide. The inclined surface of the adjusting block 14 interacts with the inclined surface of the wedge-shaped locking member 6, causing the wedge-shaped locking member 6 to slide along the guide groove 8 and move towards the locking cavity 10, ultimately achieving locking or unlocking.

[0031] A cable inlet hole 15 is provided on one outer wall of the main frame 1, and a cable outlet hole 16 is provided on the other outer wall. These two holes are located on opposite sides of the main frame 1, facilitating the connection between the tensioner and external components. Support arms 17 are symmetrically fixed to the outer walls of both sides of the main frame 1. A control panel 18 is mounted on one end of each support arm 17, and operation buttons 19 are distributed on one outer wall of the control panel 18. The control panel 18 is electrically connected to the drive motor 11, allowing the user to start or stop the drive motor 11 via the operation buttons 19, thus achieving automated adjustment of the tensioner.

[0032] During actual operation, when the tensioner is subjected to tensile force, the drive motor 11 starts and drives the threaded rod 12 to rotate via the transmission shaft. The limiting block 13 moves along the axial direction of the threaded rod 12 and pushes the adjusting block 14 to slide. The inclined surface of the adjusting block 14 interacts with the inclined surface of the wedge-shaped locking member 6, causing the wedge-shaped locking member 6 to slide along the guide groove 8 and move closer to the locking cavity 10. One side of the flat surface of the wedge-shaped locking member 6 is tightly fitted with the inner wall of the locking cavity 10, forming a stable mechanical locking structure, thereby realizing the positive locking function.

[0033] When the tensioner is subjected to compressive force, the drive motor 11 rotates in the opposite direction, and the limit block 13 moves in the opposite direction along the axial direction of the threaded rod 12, pulling the adjusting block 14 away from the wedge-shaped locking member 6. At this time, under the elastic force of the return spring 7, the wedge-shaped locking member 6 returns to its original position and re-fits against the inner wall of the locking cavity 10. At the same time, the linkage gear 9 drives the wedge-shaped locking member 6 on the other side to move synchronously, thereby realizing the reverse locking function.

[0034] In the locked state, the flat side of the wedge-shaped locking member 6 fits tightly against the inner wall of the locking cavity 10, forming a highly secure bidirectional self-locking function. The design of the locking cavity 10 ensures that the wedge-shaped locking member 6 maintains stable locking performance over a long period under high load, vibration environment, or alternating load conditions. The elastic force of the return spring 7 ensures that the wedge-shaped locking member 6 always maintains its initial position when no external force is applied, preventing locking failure due to external vibration or impact.

[0035] Furthermore, the cooperative design of the guide groove 8 and the slider 5 within the main frame 1 ensures the stability of the wedge-shaped locking element 6 during movement. When the slider 5 slides within the guide groove 8, its movement trajectory is strictly limited, preventing deviation or jamming, thereby improving the reliability and service life of the tensioner. The design of the support arm 17 enhances the structural strength of the main frame 1. It is fixedly connected to the outer walls on both sides of the main frame 1, not only providing support but also distributing external loads, preventing deformation or damage to the main frame 1 due to long-term use.

[0036] In summary, this invention achieves a high-tightness bidirectional self-locking function through the coordinated operation of the bidirectional self-locking component 2 and the adjusting drive component 3, thus solving the problem of insufficient reliability of existing tensioners under complex working conditions. To better enable those skilled in the art to fully understand and implement this invention, the specific implementation principle is further explained below with reference to a specific application scenario.

[0037] In an industrial equipment connection scenario, this tensioner is used to secure high-load transmission components. The user first assembles the tensioner with the external component to be connected via the inlet hole 15 and outlet hole 16, ensuring that the support arm 17 of the main frame 1 is securely mounted on the equipment base. Subsequently, the operator starts the drive motor 11 via the operation button 19 on the control panel 18, initiating the automated adjustment phase.

[0038] When the tensioner needs to withstand a positive tensile force, the drive motor 11 starts and drives the threaded rod 12 to rotate via the transmission shaft. At this time, the limit block 13 moves along the axial direction of the threaded rod 12 and pushes the adjusting block 14 to slide. The inclined surface of the adjusting block 14 interacts with the inclined surface of the wedge-shaped locking member 6, causing the wedge-shaped locking member 6 to slide along the guide groove 8 and move closer to the locking cavity 10. Since the flat side of the wedge-shaped locking member 6 is tightly fitted with the inner wall of the locking cavity 10, a mechanical locking structure is formed, thereby realizing the positive locking function. During this process, the return spring 7 is compressed, and its elastic force provides power reserve for subsequent unlocking, while avoiding locking failure due to external vibration.

[0039] When the tensioner is subjected to reverse compressive force, the drive motor 11 rotates in the opposite direction, and the threaded rod 12 drives the limit block 13 to move axially in the opposite direction, causing the adjusting block 14 to move away from the wedge-shaped locking member 6. At this time, the elastic force of the return spring 7 pushes the wedge-shaped locking member 6 back to its original position and re-fits against the inner wall of the locking cavity 10. The linkage gear 9 transmits the motion to the wedge-shaped locking member 6 on the other side through the meshing relationship of the racks 4 on both sides, causing them to move synchronously and complete the reverse locking. This process ensures that the tensioner can achieve a reliable self-locking function under bidirectional force conditions.

[0040] In practical applications, if the tensioner needs to be unlocked, the user can restart the drive motor 11 via the operation button 19 on the control panel 18, causing it to run according to the preset program. The threaded rod 12 drives the limit block 13 and the adjusting block 14 to move in the opposite direction, releasing the force exerted by the inclined surface of the adjusting block 14 on the wedge-shaped locking member 6. This allows the wedge-shaped locking member 6 to completely disengage from the locking cavity 10 under the action of the return spring 7, returning to its initial state. This process enables the tensioner to be quickly unlocked, facilitating subsequent reuse.

[0041] Furthermore, under long-term high stress, the guide groove 8 within the main frame 1 strictly restricts the movement trajectory of the slider 5, preventing the wedge-shaped locking element 6 from shifting or jamming, thereby ensuring the stability and reliability of the locking action. The design of the support arm 17 further enhances the overall rigidity of the main frame 1, distributes external loads, and prevents deformation or damage due to long-term use.

[0042] In summary, through the synergistic operation of the above steps and principles, this utility model solves the problem of insufficient reliability of existing tensioners under complex working conditions, and meets the requirements of high tightness, bidirectional self-locking, and long-term stability.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-tightness bidirectional self-locking tensioner, characterized in that, The system includes a main frame (1), a two-way self-locking assembly (2), and an adjustment drive assembly (3). The two-way self-locking assembly (2) is installed inside the main frame (1), and the adjustment drive assembly (3) is fixedly connected to one side of the outer wall of the main frame (1). The two-way self-locking assembly (2) includes a rack (4), a slider (5), a wedge-shaped locking element (6), a return spring (7), a guide groove (8), a linkage gear (9), and a locking cavity (10). The main frame (1) has symmetrically opened guide grooves (8), and a slider (5) is slidably connected in the guide grooves (8). A rack (4) is fixedly connected to one side of the outer wall of the slider (5). A linkage gear (9) is meshed between the racks (4). A linkage gear (9) is rotatably connected to the inner wall of the middle part of the main frame (1). A wedge-shaped locking member (6) is fixedly connected to the outer wall of one end of the slider (5). One side of the wedge-shaped locking member (6) is provided with an inclined surface, and the other side is a plane. A return spring (7) is fixedly connected to the outer wall of one side of the wedge-shaped locking member (6). The other end of the return spring (7) is fixedly connected to the inner wall of the main frame (1). Locking cavities (10) are symmetrically opened at both ends of the main frame (1). The locking cavities (10) cooperate with the wedge-shaped locking member (6).

2. The high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The adjustment drive assembly (3) includes a drive motor (11), a transmission shaft, a threaded rod (12), a limiting block (13), and an adjustment block (14). The drive motor (11) is fixedly connected to one side of the outer wall of the main frame (1). The top of the output shaft of the drive motor (11) is fixedly connected to the transmission shaft. The threaded rod (12) is fixedly connected to one end of the outer wall of the transmission shaft. The limiting block (13) is threadedly connected to the outer wall of the threaded rod (12). The adjustment block (14) is fixedly connected to one side of the outer wall of the limiting block (13). One end of the adjustment block (14) is slidably connected to the inner wall of the main frame (1). An inclined surface is provided on one side of the outer wall of the adjustment block (14), and the inclined surface of the adjustment block (14) is in contact with the inclined surface of the wedge-shaped locking member (6).

3. The high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The main frame (1) has an inlet hole (15) on one side of its outer wall and an outlet hole (16) on the other side of its outer wall, with the outlet hole (16) located on the opposite side of the inlet hole (15).

4. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, Support arms (17) are symmetrically fixedly connected to the outer walls on both sides of the main frame (1). A control panel (18) is installed at one end of the support arm (17). Operation buttons (19) are distributed on one side of the outer wall of the control panel (18).

5. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The reset spring (7) is sleeved on the outer wall of the wedge-shaped locking member (6), and there are two reset springs (7).

6. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The plane side of the wedge-shaped locking member (6) is closely fitted with the inner wall of the locking cavity (10), and the inclined surface of the wedge-shaped locking member (6) and the inclined surface of the adjusting block (14) form an angle fit.

7. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The linkage gear (9) is rotatably connected to the inner wall of the middle part of the main frame (1) via a rotating shaft, and the two sides of the linkage gear (9) are respectively engaged with the rack (4).

8. A high-tightness bidirectional self-locking tensioner according to claim 2, characterized in that, The drive motor (11) is electrically connected to the control panel (18), and the control panel (18) controls the start or stop of the drive motor (11) through the operation button (19).

9. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The guide groove (8) is rectangular in shape and extends along the length of the main frame (1). The width of the guide groove (8) matches the outer contour of the slider (5).

10. A high-tightness bidirectional self-locking tensioner according to claim 1, characterized in that, The inner wall of the locking cavity (10) is closely fitted with one side of the plane of the wedge-shaped locking member (6) to form a mechanical locking structure.

Images