Fastener with pre-tightening and anti-loosening functions
Through the design of the double nut structure and locking components, the problem of fasteners being easily stolen and poor anti-loosening effects is solved, and efficient anti-loosening and anti-theft functions are achieved to ensure the safety of the facilities.
Patent Information
- Application Number
- CN202422922396.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing fasteners are easily stolen in outdoor facilities, resulting in safety hazards, and the single nut structure is not well protected from loosening.
A double nut structure is adopted, and a locking assembly is provided between the first nut and the second nut, including a plug plate and a self-locking column pin, to achieve locking through key operation to prevent loosening and theft.
It effectively improves the anti-loosening effect of fasteners, enhances safety, prevents illegal disassembly, and ensures the stability of the facilities.
Smart Images
Figure CN223270374U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fasteners, in particular to a fastener with a pre-tightening and anti-loosening function. Background Art
[0002] Typically, fasteners used in threaded connections in mechanical equipment consist of bolts, nuts, and spring washers. Bolts typically rely on the nuts themselves to prevent loosening. However, these nuts are relatively easy to remove after installation. For installations in outdoor facilities such as power transmission towers, railway projects, communication systems, and highways, the use of removable nuts can easily lead to safety incidents if stolen. Utility Model Content
[0003] The purpose of the present invention is to provide a fastener with a pre-tightening and anti-loosening function to solve the problems raised in the above background technology.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a fastener with a pre-tightening and anti-loosening function, comprising a bolt, the bolt comprising a threaded section and a smooth section, the outer surface of the threaded section being threadedly connected to a first nut and a second nut, a locking assembly being provided between the first nut and the second nut, the locking assembly comprising an insert plate and a self-locking pin, the second nut being provided with a channel for the insert plate to enter and rotate and move with the second nut, the top end of the second nut being provided with a through hole, the through hole being connected to the channel, the top end of the insert plate being provided with a connecting hole, the self-locking pin being inserted through the through hole into the connecting hole to fix the insert plate.
[0005] The following improvement is made in the solution of the present application: the number of the inserting plates is more than two, and the plurality of inserting plates are circumferentially arranged on the top end of the first nut.
[0006] The following improvements are made in the present application: the plug plate is arranged in an inverted L-shaped structure, and the channel includes an insertion section and an annular cavity for the upper end of the plug plate to rotate and move upward. The insertion section cooperates with the upper end of the plug plate, and through grooves are provided on both sides of the insertion section for the lower end of the plug plate to rotate. The annular cavity is respectively connected to the insertion section and the through groove.
[0007] The following improvements are made in the present application: the self-locking pin is equipped with a key, a special-shaped groove is provided at the top of the self-locking pin, a plug that matches the special-shaped groove is provided at the lower end of the key, and the key is movably inserted into the special-shaped groove through the plug.
[0008] The following improvements are made in the present application: the connecting hole is a threaded hole, the lower end of the self-locking pin is provided with an external thread that matches the threaded hole, and the through hole is a countersunk hole, the inner wall of which is provided with an internal thread that matches the external thread.
[0009] The present invention provides the following improvements: the threaded section includes a forward thread and a reverse thread rotating in opposite directions, and the first nut and the second nut are disposed on the forward thread and the reverse thread, respectively. When the bolt tends to loosen, the first nut on the forward thread will vibrate and rotate outward in the reverse direction, and friction will drive the second nut on the reverse thread to rotate in the same reverse direction. The reverse rotation of the second nut will tighten itself, thereby preventing the bolt from loosening further.
[0010] Compared with the prior art, the present invention provides a fastener with a pre-tightening and anti-loosening function, which has the following beneficial effects:
[0011] The utility model adopts a double nut structure, which effectively improves the anti-loosening effect of the threaded fastener and exerts a double fastening effect compared with a single nut. At the same time, a locking component is arranged between the double nuts. When the second nut is rotated to fit with the first nut, the plug plate penetrates into the second nut along the channel under the action of synchronous rotation, and then the self-locking pin is inserted into the through hole, the key is inserted into the self-locking pin, and the key is turned, thereby driving the self-locking pin to rotate through the thread into the threaded hole at the upper end of the plug plate to fix the position of the plug plate and lock the double nuts. The self-locking pin can only be removed with the matching key to unlock it, thereby achieving anti-theft. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of the utility model;
[0013] Figure 2 It is a cross-sectional view of the utility model;
[0014] Figure 3 is a structural schematic diagram of the first nut;
[0015] Figure 4 is a structural schematic diagram of the second nut;
[0016] Figure 5 This is a schematic structural diagram of the second nut from another angle;
[0017] Figure 6 Schematic diagram of the connection between the key and the self-locking pin.
[0018] In the figure: 1. bolt; 11. threaded section; 12. smooth section; 2. first nut; 3. second nut; 31. through hole; 32. insertion section; 33. annular cavity; 34. through groove; 4. insert plate; 5. self-locking pin; 51. special-shaped groove; 52. external thread; 6. key; 61. plug. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention:
[0020] like Figure 1-2 As shown, a fastener with a pre-tightening and anti-loosening function is mainly composed of a bolt 1, a first nut 2 and a second nut 3; wherein the bolt 1 includes a threaded section 11 and a smooth section 12, the threaded section 11 includes a forward thread and a reverse thread with opposite rotation directions, and the first nut 2 and the second nut 3 are respectively arranged on the forward thread and the reverse thread.
[0021] like Figure 3-5 As shown, a locking assembly is provided between the first nut 2 and the second nut 3, and the locking assembly includes an insert plate 4 and a self-locking pin 5; there are two insert plates 4, which are symmetrically arranged at the top end of the first nut 2, and the insert plate 4 is arranged in an inverted L-shaped structure, and a channel for the insert plate 4 to enter and rotate with the second nut 3 is provided on the second nut 3, and a through hole 31 is provided at the top end of the second nut 3, and the through hole 31 is communicated with the channel, and a connecting hole 41 is provided at the top end of the insert plate 4, and the self-locking pin 5 passes through the through hole 31 and is inserted into the connecting hole 41 to fix the insert plate 4, and the connecting hole 41 is a threaded hole, and the lower end of the self-locking pin 5 is provided with an external thread 52 that matches the threaded hole, and the through hole 31 is a countersunk hole, and its inner wall is provided with an internal thread that matches the external thread 52; the channel includes an insertion section The screw threaded portion 32 is provided with a screw threaded portion 33 and a screw threaded portion 34 is provided on both sides of the screw threaded portion 32 so that the screw threaded portion 32 is tightened.
[0022] like Figure 6 As shown, the self-locking pin 5 is equipped with a key 6. A special-shaped groove 51 is provided at the top of the self-locking pin 5, and a plug 61 that matches the special-shaped groove 51 is provided at the lower end of the key 6. The key 6 is movably inserted into the special-shaped groove 51 through the plug 61.
[0023] The above embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
Claims
1. A fastener with a pre-tightening and anti-loosening function, comprising a bolt (1), characterized in that: The bolt (1) comprises a threaded section (11) and a smooth section (12); a first nut (2) and a second nut (3) are threadedly connected to the outer surface of the threaded section (11); a locking assembly is provided between the first nut (2) and the second nut (3); the locking assembly comprises an insert plate (4) and a self-locking pin (5); a passage for the insert plate (4) to enter and rotate and move with the second nut (3) is provided on the second nut (3); a through hole (31) is provided at the top end of the second nut (3); the through hole (31) is communicated with the passage; a connecting hole (41) is provided at the top end of the insert plate (4); the self-locking pin (5) passes through the through hole (31) and is inserted into the connecting hole (41) to fix the insert plate (4).
2. The fastener with pre-tightening and anti-loosening function according to claim 1, characterized in that: The number of the inserting plates (4) is more than two, and the plurality of inserting plates (4) are circumferentially arranged on the top end of the first nut (2).
3. The fastener with pre-tightening and anti-loosening function according to claim 2, characterized in that: The inserting plate (4) is arranged in an inverted L-shaped structure. The channel comprises an inserting section (32) and an annular cavity (33) for the upper end of the inserting plate (4) to rotate and move upward. The inserting section (32) cooperates with the upper end of the inserting plate (4). Through grooves (34) for the lower end of the inserting plate (4) to rotate are provided on both sides of the inserting section (32). The annular cavity (33) is respectively communicated with the inserting section (32) and the through groove (34).
4. The fastener with pre-tightening and anti-loosening function according to claim 1, characterized in that: The self-locking pin (5) is matched with a key (6), the top of the self-locking pin (5) is provided with a special-shaped groove (51), the lower end of the key (6) is provided with a plug (61) that matches the special-shaped groove (51), and the key (6) is movably inserted into the special-shaped groove (51) through the plug (61).
5. The fastener with pre-tightening and anti-loosening function according to claim 4, characterized in that: The connecting hole (41) is a threaded hole, the lower end of the self-locking pin (5) is provided with an external thread (52) that matches the threaded hole, and the through hole (31) is a countersunk hole, the inner wall of which is provided with an internal thread that matches the external thread (52).
6. The fastener with pre-tightening and anti-loosening function according to claim 1, characterized in that: The threaded section (11) comprises a forward thread and a reverse thread with opposite rotation directions, and the first nut (2) and the second nut (3) are respectively arranged on the forward thread and the reverse thread.