Stop screw with gradually-changed screw pitch

Abstract

The utility model discloses a gradually changing screw pitch lock screw, including screw and nut, the screw includes the nut and screw rod that are integrated, the screw rod is provided with external thread structure, external thread structure includes coarse thread and fine thread, the transition rod is arranged between the fine thread and the nut, the transition rod is provided with the convex ring, the convex ring is provided with the screw cap, and the screw cap is provided with the screw cap and the screw rod. The diameter of the protruding ring is larger than the width of the coarse thread and the width of the fine thread, an internal thread structure is arranged on the inner surface of the nut, a transition ring groove is formed in the inner surface of one end of the nut, a plurality of protruding blocks are arranged on the inner surface of the transition ring groove, and the diameter of the transition ring groove is larger than that of the protruding ring. The inner diameter formed by the transition ring groove and the protruding block is smaller than the diameter of the protruding ring, the nut is clamped through the protruding block and the protruding ring, limiting and fixing are achieved, fine threads are arranged at the fixing position, the connecting stability is further enhanced, and the loosening risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of screws, and in particular relates to a gradual pitch anti-loosening screw. Background Art

[0002] Screws are commonly used in many industries as connecting parts. The stability of mechanical connections is crucial. Traditional screws usually use spring washers and toothed washers as connecting parts and fix them with nuts to increase friction and prevent loosening. However, they are still at risk of loosening due to factors such as high-frequency vibration and temperature changes, affecting long-term use. Utility Model Content

[0003] The utility model aims to solve the above problems and provide a gradual pitch anti-loosening screw to solve the technical problem that screws and nuts are easily loosened in the prior art.

[0004] The utility model is realized through the following technical solutions: a gradual pitch anti-loosening screw, comprising a screw and a nut detachably mounted on the screw, the screw comprising an integrally formed nut and a screw, an external thread structure being provided on the screw ring, the external thread structure on the screw away from one end of the nut being a coarse thread, the thread on the screw close to one end of the nut being a fine thread, the coarse thread and the fine thread having the same width, a transition rod being provided between the fine thread and the nut, a convex ring being provided on the transition rod, the diameter of the convex ring being larger than the width of the coarse thread and the fine thread, an internal thread structure being provided on the inner surface of the nut for cooperating with the external thread structure, a transition ring groove being provided on the inner surface of one end of the nut, a plurality of protrusions being provided on the inner surface of the transition ring groove, the diameter of the transition ring groove being larger than the diameter of the protruding ring, and the inner diameter formed by the transition ring groove plus the protrusions being smaller than the diameter of the protruding ring.

[0005] Furthermore, an inner cross structure is provided on a side of the nut away from the screw rod, and an outer edge of the nut is an outer hexagonal structure.

[0006] Furthermore, the extension length of the coarse thread on the screw is greater than the extension length of the fine thread.

[0007] Furthermore, the protrusions are arranged in an annular array on the inner surface of the transition ring groove.

[0008] When the utility model is in use, the end of the nut with the transition ring groove is aligned with the coarse thread end of the screw, and the nut is continuously rotated to move it along the coarse thread to the fine thread until the transition ring groove on the nut moves to the transition rod position of the screw. Since the inner diameter formed by the transition ring groove and the protrusion is smaller than the diameter of the protruding ring, the nut is blocked at this position, and the force of rotating the nut is increased so that the protrusion is stuck in the other side along the edge of the protruding ring, so that the nut is limited and fixed on the screw, and vibration and slight rotation cannot turn the nut over the protruding ring, forming a locking connection that effectively prevents loosening. Moreover, by setting the end where the nut enters the screw connection as a coarse thread, it is convenient to screw in the position, and the displacement end is a fine thread, which makes the nut have better self-locking properties, further increases the installation stability, and reduces the risk of loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of the present utility model.

[0010] The reference numerals are as follows:

[0011] 1. Screw; 11. Nut; 12. Screw; 121. External thread structure; 1211. Coarse thread; 1212. Fine thread; 13. Transition rod; 131. Raised ring; 2. Nut; 21. Internal thread structure; 22. Transition ring groove; 221. Bump. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to specific examples and accompanying drawings.

[0013] like Figure 1 As shown, the utility model describes a gradual pitch anti-loosening screw, comprising a screw and a nut detachably mounted on the screw, the screw comprising an integrally formed nut and screw, the screw ring being provided with an external thread structure, the external thread structure on the screw away from one end of the nut being a coarse thread, and the thread on the screw close to one end of the nut being a fine thread, the coarse thread and the fine thread being the same width, that is, the overall width of the external thread structure on the screw remains neat and consistent, a transition rod is provided between the fine thread and the nut, the transition rod is provided with a convex ring, the diameter of the convex ring is larger than the width of the coarse thread and the fine thread, the inner surface of the nut is provided with an internal thread structure used in conjunction with the external thread structure, the inner surface of one end of the nut is provided with a transition ring groove, the inner surface of the transition ring groove is provided with a plurality of protrusions, the diameter of the transition ring groove is larger than the diameter of the protruding ring, and the inner diameter formed by the transition ring groove plus the protrusions is smaller than the diameter of the protruding ring.

[0014] When in use, align the end of the nut with the transition ring groove with the coarse thread end of the screw, and continue to rotate the nut to move it along the coarse thread to the fine thread until the transition ring groove on the nut moves to the transition rod position of the screw. Since the inner diameter formed by the transition ring groove and the protrusion is smaller than the diameter of the protruding ring, the nut is blocked at this position, and the force of rotating the nut is increased so that the protrusion is stuck in the other side along the edge of the protruding ring, so that the nut is limited and fixed on the screw, and vibration and slight rotation cannot turn the nut over the protruding ring, forming a locking connection that effectively prevents loosening. By setting the end where the nut enters the screw connection to a coarse thread, it is convenient to screw in, and the end of the displacement is a fine thread, which makes the nut have better self-locking properties, further increases the installation stability, and reduces the risk of loosening.

[0015] The nut in the embodiment of the utility model is provided with an inner cross structure on the side away from the screw rod, and the outer edge of the nut is an outer hexagonal structure. The inner cross structure is adapted to a conventional cross screwdriver. In the case of fine adjustment and operation in a narrow space, the screwdriver can be accurately embedded, which is convenient for the user to carefully control the screwing force and angle, thereby achieving fine-tuning and precise positioning of the nut and meeting high-precision assembly requirements. The outer hexagonal structure is compatible with wrench operation. When large torque is required, fast tightening or disassembly is required, the wrench is firmly engaged and efficiently transmits force by relying on the lever principle to complete the operation quickly without worrying about the nut being stripped or damaged due to uneven force. By setting up the two structures to coexist, the adaptability range of the operating tools is broadened, allowing users to flexibly choose according to actual working conditions. Whether it is internal maintenance of compact equipment or conventional large-scale assembly, the nut installation and disassembly operations can be guaranteed to be convenient, efficient, stable and reliable, which effectively enhances the assemblability, maintainability and durability of the overall mechanical structure.

[0016] The extension length of the coarse thread on the screw in the embodiment of the present invention is greater than the extension length of the fine thread, that is, the fine thread is mainly distributed at the displacement end position of the nut. In the actual assembly process, in view of the initial screw-in stage of the nut, it is necessary to quickly cross a long distance and efficiently position it to the predetermined position. The coarse thread relies on its relatively large pitch specification to provide ample displacement stride when the nut rotates, accelerate its advancement speed on the screw, effectively reduce the time consumed in initial alignment and preliminary screwing, and improve assembly efficiency. The fine thread is focused on the displacement end of the nut, that is, it mainly plays a role in the stage approaching the final locking. At this time, as the nut approaches the target position, the focus is switched from rapid movement to stable locking. The fine pitch and tight meshing characteristics of the fine thread are highlighted, strengthening the bite force between the nut and the screw, and using good self-locking performance to resist vibration and external force interference, ensuring long-term stable connection, and avoiding loosening and disengagement.

[0017] The protrusions in the embodiment of the present invention are arranged in an annular array on the inner surface of the transition ring groove. When the nut is screwed into the corresponding position along the screw, this uniform distribution provides a stable guide for the nut to cross the protrusions. Through multi-point, symmetrical support, the force required to force the nut to be screwed in is effectively dispersed, avoiding local stress concentration causing structural damage. In addition, when facing external force interference conditions such as vibration and slight rotation, the annular array arrangement structure can limit the displacement of the nut at multiple points, evenly bear the impact of external forces, strengthen the tightness and stability of the connection between the nut and the screw, and extend the service life of the fastening structure.

[0018] The above embodiments are only preferred implementation methods of the present invention and are only used to explain the present invention rather than to limit the present invention. Any changes, replacements, combinations, simplifications, modifications, etc. made by those skilled in the art without departing from the spirit and principles of the present invention shall be considered as equivalent replacement methods and shall be included in the scope of protection of the present invention.

Claims

1. A variable pitch anti-loosening screw, characterized by: The screw comprises a screw and a nut which is detachably mounted on the screw, the screw comprising an integrally formed nut and a screw rod, the screw rod being provided with an external thread structure, the external thread structure on the screw rod away from one end of the nut being a coarse thread, the thread on the screw rod close to one end of the nut being a fine thread, the coarse thread and the fine thread having the same width, a transition rod being provided between the fine thread and the nut, a convex ring being provided on the transition rod, the diameter of the convex ring being greater than the width of the coarse thread and the fine thread, an internal thread structure being provided on the inner surface of the nut for use with the external thread structure, a transition ring groove being provided on the inner surface of one end of the nut, a plurality of protrusions being provided on the inner surface of the transition ring groove, the diameter of the transition ring groove being greater than the diameter of the protruding ring, and the inner diameter formed by the transition ring groove plus the protrusions being smaller than the diameter of the protruding ring.

2. The variable pitch anti-loosening screw according to claim 1, characterized in that: An inner cross structure is provided on a side of the nut away from the screw rod, and an outer edge of the nut is an outer hexagonal structure.

3. The variable pitch anti-loosening screw according to claim 1, characterized in that: The extension length of the coarse thread on the screw is greater than the extension length of the fine thread.

4. The variable pitch anti-loosening screw according to claim 1, characterized in that: The protrusions are arranged in an annular array on the inner surface of the transition ring groove.

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