Anti-loose compression nut
The design of double sealing rings and secondary clamping mechanism enhances the anti-loosening effect of hydraulic pipe interfaces, solves the problem of loose threads in hydraulic pipe interfaces in high vibration environments, and achieves stable connection in vibration environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HANHONG PRECISION MATERIAL CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-21
AI Technical Summary
In high-vibration/impact environments, the threaded connection of hydraulic pipeline interfaces may loosen, resulting in poor clamping effect and potentially causing the nut to fall off, thus posing a probability of loosening and falling off.
It adopts a double sealing ring design and a secondary clamping mechanism. By squeezing the wedge cavity, the sealing ring is deformed, increasing the friction. The threaded pin provides a clamping force perpendicular to the radial direction, achieving precise clamping and fixing, and improving vibration resistance.
It enhances the nut's anti-loosening effect under vibration, reduces the probability of loosening and falling off, and improves the stability at hydraulic pipeline interfaces.
Smart Images
Figure CN224533224U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of clamping nut technology, and in particular to an anti-loosening clamping nut. Background Technology
[0002] A compression nut (also known as a lock nut or sealing nut) is a special type of nut that achieves a sealing or securing function by applying pressure axially (along the pipe direction).
[0003] Using clamping nuts to secure hydraulic pipeline interfaces plays a crucial role in the overall stability of the pipeline. However, hydraulic pipeline interfaces operate in high-vibration / impact environments. Under prolonged vibration, threaded connections may loosen, thereby weakening the clamping effect. A deterioration in the clamping effect may cause the nut to fall off, indicating a probability of loosening and falling off. Utility Model Content
[0004] The purpose of this invention is to address the problem in the prior art where the use of clamping nuts for fixing hydraulic pipeline interfaces plays an important role in the overall stability of the pipeline. However, the hydraulic interface pipeline environment is a high-vibration / impact environment. Under long-term vibration, the threaded connection may loosen, thereby weakening the clamping effect. The deterioration of the clamping effect may cause the nut to fall off, resulting in a probability of loosening and falling off.
[0005] To achieve the above objectives, this utility model adopts the following technical solution: an anti-loosening clamping nut, comprising a hexagonal screw head with an internal thread, and a pipe connection sleeve fixedly connected to the lower end of the hexagonal screw head; a first sealing ring is embedded in the contact surface between the hexagonal screw head and the pipe connection sleeve; a compression wedge cavity is provided at the upper end of the hexagonal screw head, and a second sealing ring is provided within the compression wedge cavity; a secondary clamping mechanism is provided within the pipe connection sleeve. Through the design of the double sealing rings, the hydraulic pipe connector and the second sealing ring are compressed, and the second sealing ring gradually deforms along the compression wedge cavity, tightly pressing against the end of the hydraulic pipe connector, increasing the clamping friction with the end of the hydraulic pipe connector. The first sealing ring also deforms and presses against the pipe end face of the hydraulic pipe connector, further increasing the clamping friction with the pipe end face of the hydraulic pipe connector, thereby achieving compression and clamping of the end face. The precise clamping and fixing at two points can improve the clamping and anti-loosening effect of the nut, improve the vibration resistance in a vibration environment, and reduce the probability of loosening and falling off.
[0006] In a preferred embodiment, the secondary clamping mechanism includes multiple slidingly connected clamping tube clamps disposed on the inner wall of the pipe connection sleeve. The rear end of each clamping tube clamp is rotatably connected to a threaded pin, which is threadedly connected to the pipe connection sleeve. By rotating the pipe connection sleeve, the threaded pin can be moved toward the wall of the hydraulic pipe joint, providing a clamping force perpendicular to the radial direction. The two mutually perpendicular clamping forces can further improve the anti-detachment effect of this application.
[0007] In a preferred embodiment, the rear end of the clamping pipe clamp is fixedly connected to two symmetrically distributed guide rods. The guide rods are slidably connected to the pipe connecting sleeve, and the guide rods limit and guide the movement of the pipe connecting sleeve, making the movement of the pipe connecting sleeve more stable.
[0008] In a preferred embodiment, a handle is fixedly connected to the end of the threaded pin, which facilitates the user to rotate and drive the threaded pin.
[0009] In a preferred embodiment, the surface of the internal thread is sequentially provided with an electroplated nickel layer and a PTFE composite coating. Through these two layers of corrosion protection, the oxidation and corrosion resistance of the internal thread is effectively improved.
[0010] In a preferred embodiment, the threaded pin needs to be sealed with sealant after tightening to reduce the oxidation of the threads and improve the service life of the device.
[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention utilizes a double-sealing-ring design, causing the hydraulic pipe connector to be compressed against the second sealing ring. The second sealing ring gradually deforms along the compression wedge cavity, tightly pressing against the end of the hydraulic pipe connector, increasing the pressing friction. The first sealing ring also deforms and presses against the pipe end face of the hydraulic pipe connector, further increasing the pressing friction. This achieves precise compression and tightening of the end face. The two-point precision clamping improves the nut's anti-loosening effect, enhances vibration resistance in vibrating environments, and reduces the probability of loosening and falling off. Furthermore, rotating the pipe connection sleeve moves the threaded pin towards the hydraulic pipe connector wall, firmly pressing the clamp against the pipe wall and providing a radial clamping force. These two mutually perpendicular clamping forces further enhance the anti-loosening effect of this invention. Attached Figure Description
[0012] Figure 1 A three-dimensional structural diagram of an anti-loosening clamping nut provided by this utility model; Figure 2 A three-dimensional structural diagram of an anti-loosening clamping nut provided by this utility model; Figure 3A cross-sectional view of an anti-loosening clamping nut provided by this utility model; Figure 4 A partial cross-sectional view of an anti-loosening clamping nut provided by this utility model (in conjunction with a hydraulic pipeline connector).
[0013] Legend: 1. Hexagonal screwdriver; 2. Pipe connection sleeve; 3. Hydraulic pipe connector; 4. Threaded pin; 6. Internal thread; 7. Rotary handle; 8. First sealing ring; 9. Second sealing ring; 10. Extrusion wedge cavity; 11. Pipe clamp; 12. Guide rod. Detailed Implementation
[0014] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Please see Figure 1-4 This utility model provides a technical solution: an anti-loosening clamping nut, including a hexagonal screw head 1, with an internal thread 6 inside the hexagonal screw head 1, and a pipeline connecting sleeve 2 fixedly connected to the lower end of the hexagonal screw head 1; a first sealing ring 8 is embedded in the contact surface between the hexagonal screw head 1 and the pipeline connecting sleeve 2; a compression wedge cavity 10 is provided at the upper end of the hexagonal screw head 1, and a second sealing ring 9 is provided in the compression wedge cavity 10 of the hexagonal screw head 1; a secondary clamping mechanism is provided inside the pipeline connecting sleeve 2, and through the design of the double sealing rings, the hydraulic pipeline connector 3 and the second sealing ring are connected. When ring 9 is squeezed, the second sealing ring 9 will gradually deform along the squeezing wedge cavity 10 and tightly press against the end of the hydraulic pipe connector 3, increasing the pressing friction with the end of the hydraulic pipe connector 3. The first sealing ring 8 will also be squeezed and deformed against the pipe end face of the hydraulic pipe connector 3, thereby increasing the pressing friction with the pipe end face of the hydraulic pipe connector 3, thus achieving the squeezing and pressing of the end face. The precise pressing and fixing of the two points can improve the tightening and anti-loosening effect of the nut, improve the vibration resistance in the vibration environment, and reduce the probability of loosening and falling off.
[0016] like Figure 1-4 As shown, the secondary clamping mechanism includes multiple slidingly connected clamping pipe clamps 11 disposed on the inner wall of the pipe connecting sleeve 2. The rear end of the clamping pipe clamp 11 is rotatably connected to a threaded pin 4, which is threadedly connected to the pipe connecting sleeve 2. The threaded pin 4 can be moved toward the pipe wall of the hydraulic pipe joint 3 by rotating the pipe connecting sleeve 2, providing a clamping force perpendicular to the radial direction. The two mutually perpendicular clamping forces can further improve the anti-detachment effect of this application.
[0017] like Figure 1-4 As shown, the rear end of the clamping pipe clamp 11 is fixedly connected to two symmetrically distributed guide rods 12. The guide rods 12 are slidably connected to the pipe connecting sleeve 2. The guide rods 12 limit and guide the movement of the pipe connecting sleeve 2, making the movement of the pipe connecting sleeve 2 more stable.
[0018] like Figure 1-4 As shown, a handle 7 is fixedly connected to the end of the threaded pin 4, which makes it easy for the user to rotate the threaded pin 4.
[0019] like Figure 1-4 As shown, the surface of the internal thread 6 is sequentially provided with an electroplated nickel layer and a PTFE composite coating. Through these two layers of corrosion protection, the oxidation and corrosion resistance of the internal thread 6 is effectively improved.
[0020] like Figure 1-4 As shown, after tightening, threaded pin 4 needs to be sealed with sealant to reduce the oxidation of the threads at threaded pin 4 and improve the service life of the device.
[0021] Working principle: When the hydraulic pipe connector 3 is tightened, as the thread is continuously screwed in, the hydraulic pipe connector 3 and the second sealing ring 9 are squeezed together. The second sealing ring 9 will gradually deform along the squeeze wedge cavity 10 and tightly press against the end of the hydraulic pipe connector 3, increasing the pressing friction with the end of the hydraulic pipe connector 3. At the same time, the first sealing ring 8 will also be squeezed and deformed against the pipe end face of the hydraulic pipe connector 3, thereby increasing the pressing friction with the pipe end face of the hydraulic pipe connector 3, thus achieving the squeezing and tightening of the end face of the hydraulic pipe connector 3. The precise clamping and fixing at two points can improve the clamping and anti-loosening effect of the nut, improve the vibration resistance in the vibration environment, and reduce the probability of loosening and falling off. Then, by rotating the pipe connection sleeve 2, the threaded pin 4 can be moved towards the pipe wall of the hydraulic pipe connector 3, so that the clamping pipe clamp 11 is firmly pressed against the pipe wall of 3, providing a clamping force perpendicular to the radial direction. The two mutually perpendicular clamping forces can further improve the anti-loosening effect of this application.
[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A type of anti-loosening clamping nut, characterized in that, It includes a hexagonal screw head (1), which has an internal thread (6) and a pipe connection sleeve (2) fixedly connected to its lower end; a first sealing ring (8) is embedded in the contact surface between the hexagonal screw head (1) and the pipe connection sleeve (2); a compression wedge cavity (10) is provided at the upper end of the hexagonal screw head (1); a second sealing ring (9) is provided in the compression wedge cavity (10) of the hexagonal screw head (1); and a secondary pressing mechanism is provided in the pipe connection sleeve (2).
2. The anti-loosening clamping nut according to claim 1, characterized in that: The secondary clamping mechanism includes multiple slidingly connected clamping pipe clamps (11) disposed on the inner wall of the pipe connection sleeve (2). The rear end of the clamping pipe clamp (11) is rotatably connected to a threaded pin (4), and the threaded pin (4) is threadedly connected to the pipe connection sleeve (2).
3. The anti-loosening clamping nut according to claim 2, characterized in that: The rear end of the clamping pipe clamp (11) is fixedly connected to two symmetrically distributed guide rods (12), and the guide rods (12) are slidably connected to the pipe connection sleeve (2).
4. The anti-loosening clamping nut according to claim 2, characterized in that: The threaded pin (4) is fixedly connected to a handle (7) at its end.
5. The anti-loosening clamping nut according to claim 1, characterized in that: The surface of the internal thread (6) is sequentially provided with an electroplated nickel layer and a PTFE composite coating.
6. The anti-loosening clamping nut according to claim 2, characterized in that: The threaded pin (4) needs to be sealed with sealant after tightening.