Bolt anti-rotation mechanism

Abstract

The utility model discloses a bolt anti-rotation mechanism which comprises a bolt body, the bolt body comprises an outer hexagonal screw head and a threaded section fixedly installed at the bottom of the outer hexagonal screw head, the bottom of the threaded section is provided with a long hole, and the two sides of the outer surface of the threaded section are each provided with an embedded groove penetrating into the threaded section. According to the utility model, through the sliding embedding design of the threaded sliding blocks and the embedding grooves and the magnetic attraction fixing of the magnetic attraction seat, the two threaded sliding blocks can be driven by the threaded expansion piece to radially expand after the bolt is tightened, so that the threads of the threaded sliding blocks are mechanically engaged with the inner wall of the mounting hole, and the looseness caused by external vibration or torque is effectively resisted; meanwhile, due to the double-layer screw head structure of the outer hexagonal screw head and the inner hexagonal screw head, screwing of a conventional tool is facilitated, secondary locking can be achieved through the hidden type thread expansion piece, the installation convenience and the anti-rotation reliability are both considered, and the long-acting fastening requirement under the vibration working condition is particularly met.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to a bolt anti-rotation mechanism. Background Technology

[0002] In the field of mechanical assembly, bolted connections are one of the most common fastening methods. However, under conditions of vibration, impact, or alternating loads, bolts are prone to loosening, leading to connection failure and even equipment malfunction or safety hazards. Traditional anti-loosening measures, such as spring washers, double nuts, and thread-locking adhesive, can alleviate the loosening problem to some extent, but they still have many shortcomings. For example, spring washers are prone to fatigue failure under long-term vibration, double nuts occupy a large amount of space and increase assembly complexity, while thread-locking adhesive may affect subsequent disassembly and maintenance.

[0003] In existing technologies, some anti-loosening bolts employ an expansion-type structure, such as an expandable component at the bolt tail, which, through compression, forms an interference fit with the mounting hole wall. However, such structures typically rely on a single expansion element, resulting in limited anti-rotation effectiveness and susceptibility to stress relaxation under repeated vibration. Furthermore, some designs require specialized tools for installation or disassembly, reducing assembly efficiency.

[0004] Therefore, a bolt anti-rotation mechanism is proposed. Utility Model Content

[0005] This utility model is a bolt anti-rotation mechanism proposed to overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bolt anti-rotation mechanism, comprising a bolt body, the bolt body comprising an external hexagonal screw head and a threaded section fixedly installed at the bottom of the external hexagonal screw head, the bottom of the threaded section having an elongated hole, both sides of the outer surface of the threaded section having a through-hole groove, and threaded sliders slidably fitting inside the two grooves, and magnetic seats fixedly connected to adjacent sides of the outer surfaces of the two threaded sliders;

[0007] The top of the external hexagonal screw head is provided with a threaded expansion member that extends into the elongated hole, and the threaded expansion member matches the two magnetic bases.

[0008] Furthermore, both threaded sliders have threads on their outer surfaces that match the threaded sections. This design allows the external threads of the threaded sliders to tightly engage with the threaded grooves of the connected parts when the sliders are ejected, creating additional mechanical locking force and effectively preventing bolt loosening. Simultaneously, the thread matching ensures that the original thread structure is not damaged during slider movement, improving anti-loosening reliability and reusability.

[0009] Furthermore, both of the magnetic seats include arc-shaped seats, and the arc-shaped seats are fixedly connected to the threaded slider. Two magnetic strips are symmetrically embedded on adjacent sides of the outer surfaces of the two arc-shaped seats, and the magnetic poles on adjacent sides of the two adjacent magnetic strips are opposite. The magnetic strips adopt an alternating N-S pole arrangement, so that the two arc-shaped seats generate a strong attraction when they are closed, ensuring that the threaded slider remains closed when it is not expanded.

[0010] Furthermore, the top of the external hexagonal screw head is provided with a hidden groove, which not only provides storage space for the internal hexagonal screw head, but also serves to prevent accidental contact.

[0011] Furthermore, the threaded expansion component includes an internal hexagonal screw head, which is disposed inside the concealed groove. A screw rod is fixedly connected to the bottom of the internal hexagonal screw head, and the screw rod extends through the inner bottom of the concealed groove to the inside of the elongated hole and is threadedly connected to an external hexagonal screw head. An expansion section is fixedly connected to the bottom of the screw rod, and a tapered rod is fixedly connected to the bottom of the expansion section. The threaded connection between the screw rod and the bottom of the concealed groove forms an axial feed mechanism, which converts the rotational motion into the linear displacement of the tapered rod.

[0012] Furthermore, the internal hexagonal screw head, screw rod, expansion section, and tapered rod are designed as a single unit, and the integral molding structure eliminates connection gaps, ensuring efficient force transmission.

[0013] The beneficial effects of this utility model are:

[0014] In use, this utility model provides a bolt anti-rotation mechanism. Through the sliding engagement design of the threaded slider and the fitting groove, combined with the magnetic attraction of the magnetic base, the two threaded sliders can be driven to expand radially after the bolt is tightened, so that the threads form a mechanical engagement with the inner wall of the mounting hole, effectively resisting loosening caused by external vibration or torque. At the same time, the double-layer screw head structure of the external hexagonal head and the internal hexagonal head is not only easy to tighten with conventional tools, but also can achieve secondary locking through the hidden threaded expansion, taking into account both installation convenience and anti-rotation reliability. It is especially suitable for long-term fastening needs under vibration conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 : A perspective view of this utility model;

[0017] Figure 2 : A sectional perspective view of this utility model;

[0018] Figure 3 : A three-dimensional cross-sectional view of the threaded slider and arc-shaped seat of this utility model.

[0019] The attached figures are labeled as follows:

[0020] 1. Threaded section; 2. Threaded slider; 3. External hexagonal screw head; 4. Internal hexagonal screw head; 5. Hidden groove; 6. Magnetic strip; 7. Screw; 8. Expansion section; 9. Tapered rod; 10. Arc-shaped seat; 11. Fitting groove; 12. Long hole. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 3 As shown, a bolt anti-rotation mechanism is disclosed, comprising a bolt body, which includes an external hexagonal screw head 3 and a threaded section 1 fixedly installed at the bottom of the external hexagonal screw head 3. The bottom of the threaded section 1 has an elongated hole 12. Both sides of the outer surface of the threaded section 1 have through-holes 11. Threaded sliders 2 are slidably fitted into the inner sides of the two fitting grooves 11. The top view of the fitting groove 11 is T-shaped, which allows the threaded sliders 2 to slide only radially outward, preventing inward and outward movement. The outer surfaces of the two threaded sliders 2 are provided with threads that match the threaded section 1. Magnetic seats are fixedly connected to adjacent sides of the outer surfaces of the two threaded sliders 2. Both magnetic seats include an arc-shaped seat 10, and the arc-shaped seat 10 is fixedly connected to the threaded slider 2. Two magnetic strips 6 are symmetrically fitted into adjacent sides of the outer surfaces of the two arc-shaped seats 10, and the magnetic poles of adjacent sides of the two adjacent magnetic strips 6 are opposite.

[0023] The top of the external hexagonal screw head 3 is provided with a threaded expansion member that extends through the elongated hole 12 and matches with two magnetic seats. The top of the external hexagonal screw head 3 is provided with a hidden groove 5. The threaded expansion member includes an internal hexagonal screw head 4, which is located inside the hidden groove 5. The bottom of the internal hexagonal screw head 4 is fixedly connected to a screw rod 7, which extends through the bottom of the hidden groove 5 into the elongated hole 12 and is threadedly connected to the external hexagonal screw head 3. The bottom of the screw rod 7 is fixedly connected to an expansion section 8, and the bottom of the expansion section 8 is fixedly connected to a tapered rod 9. The internal hexagonal screw head 4, screw rod 7, expansion section 8, and tapered rod 9 are designed as a single unit. The thread helix angle of the screw rod 7 is smaller than the friction angle, which gives the screw rod 7 a certain self-locking ability, making it less likely to move due to vibration.

[0024] Working principle: When the external hexagonal screw head 3 is rotated, the conventional thread of the threaded section 1 engages with the connected part to achieve basic fastening. At this time, the threaded slider 2 rotates synchronously with the threaded section 1 due to the sliding guidance of the fitting groove 11. The magnetic strips 6 on the two magnetic seats generate mutual attraction through opposite poles (NS poles are adjacent), keeping the threaded slider 2 in a closed state and ensuring smooth screwing in.

[0025] Once the bolt body is in place, use a tool and the socket head cap screw 4 to screw in the bolt 7. The bolt 7 drives the expansion section 8 and the tapered rod 9 downwards. The tapered rod 9 first enters between the two arc-shaped seats 10. As it continues to screw in, the tapered rod 9 expands radially against the arc-shaped seats 10, forcing the two threaded sliders 2 to move outwards synchronously along the fitting groove 11. At this point:

[0026] The external thread of the threaded slider 2 is pressed against the side wall of the threaded groove of the connected part, forming a mechanical self-locking mechanism.

[0027] The arc-shaped base 10 of the magnetic base maintains the synchronous movement of the slider through the attraction of the magnetic strip 6, thus preventing it from tilting and getting stuck.

[0028] Expansion section 8 provides constant radial pressure for subsequent applications.

[0029] During disassembly, rotate the internal hex head 4 in the reverse direction. The tapered rod 9 moves upward to release the expansion force, and the magnetic strip 6 re-attracts and drives the threaded slider 2 to reset, restoring the bolt to a detachable state. Then, reverse the external hex head 3.

[0030] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A bolt anti-rotation mechanism, comprising a bolt body, characterized in that: The bolt body includes an external hexagonal screw head (3) and a threaded section (1) fixedly installed at the bottom of the external hexagonal screw head (3). The bottom of the threaded section (1) is provided with an elongated hole (12). Both sides of the outer surface of the threaded section (1) are provided with a through-hole (11). The inner sides of the two through-holes (11) are slidably fitted with threaded sliders (2). The outer surfaces of the two threaded sliders (2) are fixedly connected with magnetic seats on adjacent sides. The top of the external hexagonal screw head (3) is provided with a threaded expansion member that extends into the elongated hole (12), and the threaded expansion member matches the two magnetic seats.

2. The bolt anti-rotation mechanism according to claim 1, characterized in that: The outer surfaces of both threaded sliders (2) are provided with threads that match the threaded section (1).

3. The bolt anti-rotation mechanism according to claim 1, characterized in that: Both of the magnetic seats include an arc-shaped seat (10), and the arc-shaped seat (10) is fixedly connected to the threaded slider (2). Two magnetic strips (6) are symmetrically embedded on adjacent sides of the outer surfaces of the two arc-shaped seats (10), and the magnetic poles of adjacent sides of the two adjacent magnetic strips (6) are opposite.

4. The bolt anti-rotation mechanism according to claim 1, characterized in that: The top of the external hexagonal screw head (3) is provided with a hidden groove (5).

5. A bolt anti-rotation mechanism according to claim 4, characterized in that: The threaded expansion component includes an internal hexagonal screw head (4), which is located inside the hidden groove (5). The bottom of the internal hexagonal screw head (4) is fixedly connected to a screw rod (7), which extends through the bottom of the hidden groove (5) to the inside of the elongated hole (12) and is threadedly connected to an external hexagonal screw head (3). The bottom of the screw rod (7) is fixedly connected to an expansion section (8), and the bottom of the expansion section (8) is fixedly connected to a tapered rod (9).

6. The bolt anti-rotation mechanism according to claim 5, characterized in that: The internal hexagonal screw (4), screw (7), expansion section (8) and tapered rod (9) are designed as a single unit.

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