Wedge-shaped locking and pressing type safety screw capable of preventing mistaken disassembly

Abstract

The utility model relates to the technical field of mechanical part fastening, and discloses a wedge-shaped locking pressing type safety screw capable of preventing mistaken dismounting, which comprises a wedge-shaped safety cover and an anti-loose inner screw, the anti-loose inner screw comprises a screw head and a screw rod, the top of the screw head is provided with a spring groove, the top edge of the screw head is provided with a circle of wedge-shaped teeth, and the wedge-shaped safety cover is fixedly connected with the anti-loose inner screw. A spring groove is formed in the screw rod, a polish rod hole penetrating through the screw rod is formed in the bottom of the spring groove, a circle of tapered ball mounting holes are formed in the outer side of the lower end of the screw rod, balls are arranged in the ball mounting holes, the wedge-shaped safety cover comprises a cover cap and a polish rod, and one end of the polish rod is connected to the inner top wall of a cavity of the cover cap. The screw head is sleeved with the cap, and meshing teeth capable of being connected with the wedge-shaped teeth in a matched mode are arranged in a cavity of the cap. The anti-loosening device is simple in structure, capable of achieving a good anti-loosening effect, capable of preventing mistaken disassembly, high in reliability, easy to manufacture and install, rapid to operate, capable of reducing production cost and high in cost performance.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical parts fastening, in particular to a wedge-shaped locking press-type safety screw for preventing accidental disassembly. Background Art

[0002] In mechanical engineering, screws are essential components in mechanical connections, and their tightening performance is directly related to the stability and safety of the entire mechanical system. However, in actual use, screws often loosen due to factors such as vibration, shock, temperature fluctuations, and alternating loads. This not only affects the normal operation of the equipment, reduces its reliability and stability, but can even lead to serious safety accidents.

[0003] Currently, common methods for preventing screw loosening include friction locking, such as compression spring washers and double nuts; mechanical locking, such as stop washers and cotter pins; and permanent locking, such as welding and riveting. While these methods can prevent screw loosening to a certain extent, they each have their limitations. For example, friction locking has relatively low reliability and is susceptible to failure due to environmental factors; mechanical locking requires additional parts, increasing structural complexity and cost; and while permanent locking is effective, disassembly often involves damaging the fastener, hindering equipment repair and maintenance.

[0004] In addition, common methods for preventing screws from being accidentally disassembled include special-shaped nut designs, such as hexagonal and plum-shaped; locking designs, such as thread glue and welding fixation; destructive designs, such as fragile head designs and broken-head screws; and electronic locking designs. These methods can prevent screws from being accidentally disassembled to a certain extent, but they still have their own limitations. For example, special-shaped nut designs require special screwdrivers for disassembly, which increases the maintenance cost of the equipment; locking and destructive designs are effective, but they often damage the fasteners during disassembly, causing great inconvenience during normal maintenance or replacement, and also increasing the maintenance cost of the equipment; electronic locking designs increase equipment costs and require additional power and control systems. The structure is complex and not conducive to widespread application.

[0005] Therefore, it is of great significance to develop a safety screw that can prevent accidental disassembly to a certain extent and can effectively prevent the screw from loosening. Utility Model Content

[0006] The technical problem to be solved by the utility model is to prevent screws from loosening and mistakenly disassembling.

[0007] The screw threading machine is a kind of wedge-shaped safety screw with a plurality of locking portions, and the locking portion is a plurality of locking portions of the plurality of locking portions.

[0008] Optionally, a compression spring is provided in the spring groove, and the compression spring is sleeved on the polished rod. One end of the compression spring is connected to the bottom of the spring groove, and the other end is connected to the inner top wall of the cap.

[0009] Optionally, a limiting groove is provided at the bottom of one end of the screw head away from the cap, and a limiting protrusion is provided at the opening of the bottom of the cap, and the limiting protrusion can cooperate with and contact the limiting groove.

[0010] Optionally, the screw rod is provided with threads on the outside.

[0011] Optionally, a spring washer and a flat washer are sleeved on the screw rod.

[0012] Optionally, the outer side of the cap is provided with knurling and the top is provided with a screw groove.

[0013] To sum up, the utility model provides a new type of wedge-shaped locking press-type safety screw that prevents accidental disassembly. It has a simple structure, can achieve a good anti-loosening effect, and can prevent accidental disassembly. It is highly reliable and easy to manufacture and install. The installation process is basically the same as the traditional screw connection method, and the operation is quick. It does not add new mechanical parts and complex processes, reduces production costs, and has a high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the anti-loosening inner screw structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the wedge-shaped safety cover structure of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the initial state of installation of the utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the utility model after installation and tightening;

[0020] Figure 7 This is a schematic diagram of the structure of the utility model in the use state after installation;

[0021] In the figure: 1. Wedge-shaped safety cover; 2. Anti-loosening inner screw; 3. Polished rod hole; 4. Thread; 5. Spring groove; 6. Wedge-shaped teeth; 7. Ball mounting hole; 8. Ball; 9. Cover cap; 10. Polished rod; 11. Ball groove; 12. Engaging teeth; 13. Compression spring; 14. Screw head; 15. Screw rod; 16. Limiting groove; 17. Limiting protrusion; 18. Knurling; 19. Screw groove; 20. Spring washer; 21. Flat washer; 22. Connected part. DETAILED DESCRIPTION

[0022] The following combination Figure 1-7 The utility model is described in further detail.

[0023] The utility model discloses a wedge-shaped locking and pressing safety screw for preventing accidental disassembly. Figure 1 and Figure 2 , including a wedge-shaped safety cover 1 and an anti-loosening inner screw 2, the anti-loosening inner screw 2 includes a screw head 14 and a screw rod 15, such as Figure 3 As shown, the screw head 14 and the screw rod 15 are connected to form a T-shaped hollow tubular structure. A spring groove 5 is provided on the top of the screw head 14, and a circle of wedge-shaped teeth 6 is provided on the top edge. The bottom of the spring groove 5 is provided with a polished rod hole 3 that passes through the screw rod 15. The outside of the screw rod 15 is provided with a thread 4. The outer side of the lower end of the screw rod 15 is provided with a circle of tapered ball mounting holes 7. The ball mounting hole 7 is connected to the polished rod hole 3, and a ball 8 is provided in the ball mounting hole 7. Figure 4 The wedge-shaped safety cover 1 includes a cap 9 and a polished rod 10. The cap 9 is a cavity structure with an opening at the bottom. One end of the polished rod 10 is connected to the top wall of the cavity of the cap 9, and the other end is inserted into the polished rod hole 3 and is provided with a circle of ball grooves 11. The cap 9 is sleeved on the screw head 14, and the cavity of the cap 9 is provided with meshing teeth 12 that can cooperate with the wedge-shaped teeth 6.

[0024] In a further embodiment, a compression spring 13 is provided in the spring groove 5 , and the compression spring 13 is sleeved on the polished rod 10 . One end of the compression spring 13 is connected to the bottom of the spring groove 5 , and the other end is connected to the inner top wall of the cap 9 .

[0025] In a further embodiment, a limiting groove 16 is provided at the bottom of the end of the screw head 14 away from the cap 9, and a limiting protrusion 17 is provided at the opening at the bottom of the cap 9. The limiting protrusion 17 can cooperate with the limiting groove 16 to limit the displacement of the cap 9 and prevent the cap 9 from falling off.

[0026] In a further embodiment, a spring washer 20 and a flat washer 21 are provided on the screw rod 15, which can prevent the safety screw from loosening to a certain extent. The outer side of the cap 9 is provided with a hand-tightened knurling 18 and a screw groove 19 on the top.

[0027] This new wedge-locking, push-type safety screw, designed to prevent accidental disassembly, is based on the interaction of elastic deformation, friction, and wedge-locking. It is used with traditional spring washers and flat washers during installation. When in use:

[0028] Reference Figure 5 In the initial state, the spring washer 20 and the flat washer 21 are installed on the safety screw, and the safety screw is placed on the mounting hole of the connected part 22. The contact between the various parts of the safety screw and the connected part 22 is relatively loose. At this time, the compression spring 13 is in a relaxed state, and the ball 8 is pressed to the outermost edge of the ball mounting hole 7 in the anti-loosening inner screw 2 by the polished rod 10 of the wedge-shaped safety cover 1. The safety screw, spring washer 20 and flat washer 21 do not play a tightening role;

[0029] Reference Figure 6 , downward pressure and rotational torque are applied to the cap 9 of the wedge-shaped safety cover 1 at the same time. Under the action of the downward pressure, the compression spring 13 is gradually compressed. In the axial direction, the wedge-shaped teeth 6 of the anti-loosening inner screw 2 and the meshing teeth 12 of the wedge-shaped safety cover 1 are fully in contact and engaged. The anti-loosening inner screw 2 and the wedge-shaped safety cover 1 rotate at the same time. In the radial direction, the compression of the compression spring 13 causes the polished rod 10 of the wedge-shaped safety cover 1 to move downward, and the ball 8 moves inward to the ball groove 11 at the lower end of the polished rod 10. Therefore, under the simultaneous action of the downward pressure and rotational torque, the safety screw is normally installed and tightened.

[0030] Reference Figure 7 , the safety screw is tightened, the downward pressure and rotational torque are removed, the compression spring 13 gradually recovers, and in the axial direction, the wedge-shaped teeth 6 of the anti-loosening inner screw 2 and the meshing teeth 12 of the wedge-shaped safety cover 1 gradually separate. In the radial direction, the recovery of the compression spring 13 will cause the polished rod 10 of the wedge-shaped safety cover 1 to move upward, and the ball 8 moves outward to the outer edge of the ball mounting hole 7 of the anti-loosening inner screw 2, thereby pressing the polished hole part at the lower end of the screw hole of the connected part 22, thereby preventing the safety screw from loosening.

[0031] When disassembling, it is also necessary to apply downward pressure and reverse rotation torque at the same time. Under the action of the downward pressure, the compression spring 13 is gradually compressed. In the axial direction, the wedge-shaped teeth 6 of the anti-loosening inner screw 2 and the meshing teeth 12 of the wedge-shaped safety cover 1 are fully in contact and engaged. The anti-loosening inner screw 2 and the wedge-shaped safety cover 1 rotate at the same time, and the ball 8 is retracted into the ball groove 11. Under the simultaneous action of the downward pressure and reverse rotation torque, the safety screw is normally loosened.

[0032] If an unauthorized person does not apply downward pressure and only applies torque in the opposite direction, when manually loosening the safety screw, the wedge-shaped teeth 6 of the anti-loosening inner screw 2 and the meshing teeth 12 of the wedge-shaped safety cover 1 are not fully engaged, the wedge-shaped safety cover 1 will rotate alone, while the anti-loosening inner screw 2 will not rotate, the compression spring 13 will be in a relaxed state, the polished rod 10 of the wedge-shaped safety cover 1 will not move, and the ball 8 will still be at the outermost edge of the ball mounting hole 7 at the lower end of the anti-loosening inner screw 1, pressed against the polished hole part at the lower end of the thread of the connected part, and the safety screw cannot be loosened normally, thereby realizing the anti-mistaken disassembly design of the safety screw.

[0033] The safety screw structure of this utility model adds a ball locking mechanism, which can effectively resist these external forces to a certain extent in dynamic environments such as vibration and impact, greatly improving the stability of the connection and ensuring that the screw always remains tightened;

[0034] The addition of a wedge-shaped anti-mistaken disassembly mechanism reduces the risk of safety accidents caused by unauthorized personnel's misassembly to a certain extent, ensuring the safety of equipment and structures during use;

[0035] From the perspective of economic benefits, on the one hand, the safety screw has a simple structure and is easy to install. It does not require special tools and skills, and does not add any new parts that need to be installed, which reduces the production and use costs. On the other hand, due to the good relaxation effect, the frequent maintenance and replacement of screws is reduced, which reduces the maintenance cost. In practical applications, it has a wide range of applicability and can be used for connections between various materials. It is easy to install and suitable for different production and maintenance scenarios, such as home use, use by young children, etc.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. Wedge-shaped locking and pressing safety screws to prevent accidental disassembly, characterized by: The invention comprises a wedge-shaped safety cover (1) and an anti-loosening inner screw (2), wherein the anti-loosening inner screw (2) comprises a screw head (14) and a screw rod (15), wherein the screw head (14) and the screw rod (15) are connected to form a T-shaped hollow tubular structure, wherein a spring groove (5) is provided on the top of the screw head (14), and a circle of wedge-shaped teeth (6) is provided on the top edge, and a light rod hole (3) passing through the screw rod (15) is provided on the bottom of the spring groove (5), and a circle of tapered ball mounting holes (7) are provided on the outer side of the lower end of the screw rod (15). The hole (7) is connected to the polished rod hole (3), and a ball (8) is provided in the ball mounting hole (7). The wedge-shaped safety cover (1) includes a cap (9) and a polished rod (10). The cap (9) is a cavity structure with an opening at the bottom. One end of the polished rod (10) is connected to the top wall of the cavity of the cap (9), and the other end is inserted into the polished rod hole (3) and is provided with a circle of ball grooves (11). The cap (9) is sleeved on the screw head (14), and the cavity of the cap (9) is provided with meshing teeth (12) that can be matched with the wedge-shaped teeth (6).

2. The wedge-shaped locking and pressing safety screw for preventing accidental disassembly according to claim 1, characterized in that: A compression spring (13) is provided in the spring groove (5), and the compression spring (13) is sleeved on the polished rod (10). One end of the compression spring (13) is connected to the bottom of the spring groove (5), and the other end is connected to the inner top wall of the cover cap (9).

3. The wedge-shaped locking and pressing safety screw for preventing accidental disassembly according to claim 2, characterized in that: A limiting groove (16) is provided at the bottom of one end of the screw head (14) away from the cover cap (9), and a limiting protrusion (17) is provided at the opening of the bottom of the cover cap (9), and the limiting protrusion (17) can cooperate with the limiting groove (16).

4. The wedge-shaped locking and pressing safety screw for preventing accidental disassembly according to claim 1, characterized in that: The screw rod (15) is provided with a thread (4) on the outside.

5. The wedge-shaped locking and pressing safety screw for preventing accidental disassembly according to claim 4, characterized in that: The screw rod (15) is sleeved with a spring washer (20) and a flat washer (21).

6. The wedge-shaped locking and pressing safety screw for preventing accidental disassembly according to claim 1, characterized in that: The outer side of the cover cap (9) is provided with knurling (18), and the top is provided with a screw groove (19).

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