Anti-loose bolt locking device

Abstract

The utility model relates to fastener technical field especially relates to a bolt locking device of anti -loosening, including bolt head, bolt head one side is fixedly connected with screw rod, the screw rod surface is connected with the fastening nut of screw thread, the fastening nut one side is provided with locking assembly, locking assembly includes the mobile groove of opening in the fastening nut inside, the mobile rod of sliding connection in the mobile groove inside, the tooth of installation in the mobile rod bottom, the mobile ring of installation in the mobile rod top, the utility model discloses through the tooth of locking assembly liftable and the fastening surface meshing, form mechanical self -lock, effectively resist the thread convolution of vibration and lead to, the limiting nut provides secondary fastening and drives the tooth locking, and with fastening nut constitutes double anti -loosening structure, the relative rotation of two nuts is restricted to the limiting cover, and the rubber cover realizes sealing anticorrosion, and the overall structure is in keeping with the conventional bolt installation habit, and the anti -loosening reliability and environmental adaptability are improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a bolt locking device for preventing loosening. Background Technology

[0002] A bolt is a mechanical fastener consisting of a threaded cylindrical shank (screw) and a head. It is often used with a nut to securely connect two or more workpieces. Its working principle utilizes the meshing of the threads to generate a preload, ensuring a tight fit between the mating surfaces and allowing it to withstand tensile, shear, or combined loads. Bolts can be classified by head shape (hexagonal, socket head cap, round, square, etc.) and by load-bearing characteristics (ordinary bolts, high-strength bolts, and reamed bolts). Bolts are made from various materials, commonly carbon steel, alloy steel, and stainless steel. Surface finishes include galvanizing and blackening for corrosion protection. Due to their ease of assembly, disassembly, and high reliability, bolts are widely used in machinery manufacturing, construction, automotive, and aerospace industries.

[0003] Most current methods for preventing bolt loosening use double nuts for fixing, relying on the mutual restraint between the threaded sections of the two nuts to inhibit loosening. However, under long-term vibration, impact, or temperature cycle, micro-slippage of the threaded pair can still accumulate, causing the preload to gradually decrease. Double nuts may also gradually loosen, especially under heavy loads or high-frequency excitation environments, resulting in decreased reliability. Utility Model Content

[0004] The purpose of this utility model is to provide a bolt locking device to prevent loosening. By setting the locking component, it solves the problem that most existing bolt anti-loosening methods use double nuts for fixing, but double nuts can still loosen after long-term use.

[0005] The technical solution of this utility model is as follows: a bolt locking device for preventing loosening, including a bolt head, a screw rod fixedly connected to one side of the bolt head, a fastening nut threadedly connected to the surface of the screw rod, a locking assembly provided on one side of the fastening nut, the locking assembly including a movable groove opened inside the fastening nut, a movable rod slidably connected inside the movable groove, teeth installed at the bottom of the movable rod, a movable ring installed at the top of the movable rod, and a limiting nut threadedly connected to the surface of the screw rod.

[0006] Preferably, a spring is fixedly connected to the bottom of the movable ring, and the other end of the spring is fixedly connected to a fastening nut.

[0007] Preferably, the number of teeth is six, and they are arranged circumferentially around the moving ring as the axis.

[0008] Preferably, a limiting sleeve is fitted on the surface of the fastening nut and the limiting nut, and the limiting sleeve has an internal hexagonal shape that fits in close contact with the surface of the fastening nut and the limiting nut.

[0009] Preferably, a rubber sleeve is installed on the top of the limiting sleeve to fit the screw surface and serve as a waterproofing element.

[0010] Preferably, the fastening nut has a first internal thread, the limiting nut has a second internal thread, and the screw has an external thread.

[0011] The beneficial effects of this utility model are as follows: the movable teeth in the locking assembly engage with the fastening surface to form a mechanical self-locking mechanism, effectively resisting the thread rotation caused by vibration. The limiting nut provides secondary fastening and drives the teeth to lock, forming a double anti-loosening structure with the fastening nut. The limiting sleeve constrains the relative rotation of the two nuts, and the rubber sleeve achieves sealing and corrosion prevention. The overall structure significantly improves the reliability of anti-loosening and environmental adaptability while maintaining conventional bolt installation habits. Attached Figure Description

[0012] Figure 1 A perspective view of a bolt locking device designed to prevent loosening;

[0013] Figure 2 A cross-sectional view of a fastening nut in an anti-loosening bolt locking device;

[0014] Figure 3 A cross-sectional view of a limiting sleeve in an anti-loosening bolt locking device;

[0015] Figure 4 This is a schematic diagram of the installation of a fastening nut and a limiting nut in an anti-loosening bolt locking device;

[0016] Figure 5 This is a schematic diagram of the installation of a limit sleeve in a bolt locking device designed to prevent loosening.

[0017] Explanation of reference numerals in the attached drawings: 1. Bolt head; 2. Screw; 3. Fastening nut; 4. Locking assembly; 41. Moving groove; 42. Moving rod; 43. Tooth; 44. Moving ring; 45. Limiting nut; 5. Spring; 6. Limiting sleeve; 7. Rubber sleeve. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1

[0020] Please see Figure 1 and Figure 3This is the first embodiment of the present invention. This embodiment provides a bolt locking device to prevent loosening, including a bolt head 1, a screw rod 2 fixedly connected to one side of the bolt head 1, a fastening nut 3 threadedly connected to the surface of the screw rod 2, a locking component 4 provided on one side of the fastening nut 3, the locking component 4 including a moving groove 41 opened inside the fastening nut 3, a moving rod 42 slidably connected inside the moving groove 41, teeth 43 installed at the bottom of the moving rod 42, a moving ring 44 installed at the top of the moving rod 42, and a limiting nut 45 threadedly connected to the surface of the screw rod 2.

[0021] During operation, the screw 2 is first passed through the part to be connected, and the fastening nut 3 is rotated to fit against the part. Then, the limiting nut 45 is screwed in, pushing it along the thread of the screw 2 towards the fastening nut 3. The bottom of the limiting nut 45 pushes the moving ring 44 downward, causing the moving rod 42 and teeth 43 to move down along the moving groove 41 until the teeth 43 press into the surface of the workpiece, forming a circumferential engagement, preventing the fastening nut 3 from loosening in reverse. The spring 5 is compressed and stores energy. When the limiting nut 45 is rotated in the opposite direction, the spring 5 pushes the moving ring 44 upward, causing the teeth 43 to disengage, allowing for disassembly. The limiting sleeve 6 is fitted on the outside of the fastening nut 3 and the limiting nut 45. Its internal hexagonal structure fits against the outer contour of both, preventing relative rotation due to vibration. The rubber sleeve 7 tightly holds the exposed section of the screw 2, providing a waterproof and dustproof seal, achieving long-term anti-loosening of the bolt connection.

[0022] Example 2

[0023] Please see Figures 2-4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0024] Specifically: a spring 5 is fixedly connected to the bottom of the moving ring 44, and the other end of the spring 5 is fixedly connected to the fastening nut 3. There are six teeth 43, which are arranged in a circle around the moving ring 44. A limiting sleeve 6 is fitted on the surface of the fastening nut 3 and the limiting nut 45. The inside of the limiting sleeve 6 is hexagonal and fits against the surface of the fastening nut 3 and the limiting nut 45.

[0025] The moving groove 41 provides guidance and limit for the moving rod 42, ensuring that the tooth 43 moves smoothly in the vertical direction. The moving rod 42, as a transmission component, transmits the operating force of the moving ring 44 to the tooth 43. The tooth 43 acts on the fastening surface to form a mechanical lock, preventing the fastening nut 3 from rotating accidentally. The moving ring 44 allows the user to control the raising and lowering of the tooth 43 by rotating the limit nut 45, realizing a quick switch between locking and releasing. The limit nut 45, as a second fastener, clamps the connector together with the fastening nut 3 and pushes the tooth 43 to move when locked, achieving double anti-loosening. The spring 5 provides continuous elastic restoring force, keeping the tooth 43 separated from the fastening surface in the non-locked state.

[0026] Example 3

[0027] Please see Figure 5 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0028] Specifically: the top of the limiting sleeve 6 is equipped with a rubber sleeve 7, which is used to fit the surface of the screw 2 and play a waterproof role; the fastening nut 3 has a first internal thread inside; the limiting nut 45 has a second internal thread inside; and the surface of the screw 2 has an external thread.

[0029] The six teeth 43 are evenly distributed along the circumference, which can press against the fastening surface, significantly increasing the contact area and the uniformity of the locking force distribution, improving the reliability of anti-loosening and anti-torsion ability. The internal hexagonal limiting sleeve 6 can simultaneously wrap and fix the fastening nut 3 and the limiting nut 45, preventing them from rotating relative to each other due to vibration, further enhancing the stability of the overall structure. The rubber sleeve 7 fits tightly against the outer wall of the screw 2 to form a sealing ring, effectively preventing moisture, dust and other foreign objects from entering the threaded connection part, avoiding corrosion and pollution, and extending the service life of the device in harsh environments.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A bolt locking device for preventing loosening, comprising a bolt head (1), wherein a screw rod (2) is fixedly connected to one side of the bolt head (1), and a fastening nut (3) is threadedly connected to the surface of the screw rod (2), characterized in that: A locking assembly (4) is provided on one side of the fastening nut (3). The locking assembly (4) includes a moving groove (41) opened inside the fastening nut (3), a moving rod (42) slidably connected inside the moving groove (41), teeth (43) installed at the bottom of the moving rod (42), a moving ring (44) installed at the top of the moving rod (42), and a limiting nut (45) threadedly connected to the surface of the screw (2).

2. The bolt locking device according to claim 1, characterized in that: A spring (5) is fixedly connected to the bottom of the movable ring (44), and the other end of the spring (5) is fixedly connected to the fastening nut (3).

3. The bolt locking device according to claim 1, characterized in that: The number of teeth (43) is six, and they are arranged in a circle with the moving ring (44) as the axis.

4. The bolt locking device according to claim 1, characterized in that: The fastening nut (3) and the limiting nut (45) are fitted with a limiting sleeve (6), the limiting sleeve (6) is internally hexagonal and fits against the surface of the fastening nut (3) and the limiting nut (45).

5. The bolt locking device according to claim 4, characterized in that: The top of the limiting sleeve (6) is fitted with a rubber sleeve (7) to fit the surface of the screw (2) and serve as a waterproofing element.

6. The bolt locking device according to claim 1, characterized in that: The fastening nut (3) has a first internal thread, the limiting nut (45) has a second internal thread, and the screw (2) has an external thread on its surface.

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