Screw capable of improving fastening performance

Abstract

The utility model relates to the field of screws, and discloses a screw capable of improving fastening performance, which comprises a head and a rod, a hexagonal hole is arranged on the upper plane of the head, triangular anti-slip lines are arranged on the hole wall, the bottom surface of the rod is conical and hollow, an anti-slip component is arranged on the periphery of the rod, and an expansion mechanism is arranged in the rod. The anti-skid assembly is composed of a first thread, a second thread and a triangular cutting groove, the first thread and the second thread are different in thread pitch and connected end to end, the threads can make contact with a connected piece more tightly, loads are evenly distributed, the expansion mechanism comprises a fixing block, a fixing sleeve rod, a pressing block, a spring, a sliding rod, a clamping ball, barbs and the like, and when the screw is screwed in, the pressing block is pressed to push the sliding rod to move downwards; in addition, the rod portion is further sleeved with a belleville spring, an annular groove is formed in the lower portion of the belleville spring, the belleville spring can provide continuous axial pressure, a metal wire can penetrate through the annular groove to be prevented from loosening, and the screw effectively improves the fastening performance through multi-structure matching and is suitable for various working conditions.

Description

Technical Field

[0001] This utility model relates to the field of screws, specifically a screw that increases fastening performance. Background Technology

[0002] As one of the most commonly used fasteners in mechanical connections, screws directly affect the stability and safety of structures. Under vibration, impact, or variable load conditions, traditional screws are prone to loosening or even falling off, leading to connection failure, equipment malfunction, or safety hazards. Therefore, developing screws with enhanced fastening performance is crucial for improving the reliability of mechanical connections.

[0003] Traditional screws typically employ a single-pitch thread structure, relying on the friction between the thread and the connecting part to maintain tightness. However, they are prone to loosening under long-term vibration or dynamic loads. Furthermore, the friction between the head of a traditional screw and the tool contact surface is insufficient, which can easily lead to slippage and affect installation efficiency. At the same time, their fastening method relies solely on thread engagement and lacks additional anti-loosening or anti-pull-out mechanisms. Under large axial forces, thread stripping or connection failure may occur. Therefore, we propose a screw with improved fastening performance. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a screw that increases fastening performance and solves the above-mentioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a screw with increased fastening performance, comprising a head and a shank, wherein the shank is fixedly mounted on the bottom surface of the head, a hexagonal hole is provided on the upper surface of the head, the bottom surface of the shank is conical, and the shank is hollow inside;

[0006] The bottom of the rod has a circumferentially formed sliding hole on the tapered inclined surface;

[0007] An anti-slip component is fixedly installed on the periphery of the rod.

[0008] An expansion mechanism is provided inside the rod.

[0009] Preferably, the hexagonal hole on the head has triangular anti-slip textures on its hole wall.

[0010] Preferably, a stepped hole is provided below the hexagonal hole on the head, and the hexagonal hole on the head and the stepped hole are connected.

[0011] Preferably, the anti-slip component includes thread one, thread two, and a cutting groove. Thread one is provided on the outer arc surface of the rod corresponding to the lower part of the head. Thread two is provided on the outer arc surface of the rod corresponding to the lower part of thread one. A cutting groove is provided on the outer arc surface of the rod corresponding to the pitch of thread one and thread two.

[0012] The first thread and the second thread are connected end to end, and the pitch of the first thread is greater than the pitch of the second thread.

[0013] The cutting groove is triangular.

[0014] Preferably, a disc spring is coaxially sleeved on the outer arc surface of the rod, corresponding to the lower part of the head and the upper part of the thread.

[0015] Preferably, the outer arc surface of the rod is provided with an annular groove corresponding to the lower part of the disc spring.

[0016] Preferably, the expansion mechanism includes a fixing block and a fixing sleeve rod. The fixing block is coaxially fixedly installed in the stepped hole on the head, and the fixing block has a stepped hole. The fixing sleeve rod is coaxially fixedly installed inside the rod, and the outer arc surface of the fixing sleeve rod has a sliding hole circumferentially opened near the bottom.

[0017] The sliding hole on the fixed sleeve and the sliding hole on the bottom surface of the rod are coaxially corresponding.

[0018] Preferably, the expansion mechanism further includes a pressing block, a spring, and a sliding rod. A limiting plate is fixedly installed on the bottom surface of the pressing block, and a sliding rod is fixedly installed on the bottom surface of the limiting plate. An arc groove is formed on the outer arc surface of the sliding rod near the bottom. The sliding rod and the fixed sleeve rod are slidably connected coaxially. The pressing block and the fixed block are slidably connected coaxially, and the pressing block protrudes from the top surface of the fixed block. A spring is fixedly installed on the bottom surface of the limiting plate on the pressing block, corresponding to the periphery of the spring. The other end of the spring is fixedly connected to the top surface of the fixed sleeve rod.

[0019] Preferably, a snap-fit ​​ball is slidably connected in the sliding hole on the fixed sleeve, and barbs are fixedly installed on the outer circumference of the snap-fit ​​ball;

[0020] The arc-shaped groove on the sliding rod corresponds to the snap-fit ​​ball.

[0021] Compared with the prior art, this utility model provides a screw that increases fastening performance, and has the following beneficial effects:

[0022] 1. This screw, which enhances fastening performance, features triangular anti-slip grooves on the hexagonal hole wall of its head. Combined with the hexagonal hole design, this effectively increases the friction between the tool and the screw head, reducing slippage and making tightening or loosening operations more convenient.

[0023] 2. The screw with enhanced fastening performance has two threads connected end to end with different pitches in the anti-slip component on the outer periphery of the shank. In addition, the triangular cutting groove makes the threads contact the connected parts more tightly when tightened, the load distribution is more uniform, and the local stress concentration is reduced.

[0024] 3. The screw with enhanced fastening performance has an expansion mechanism inside the shank that works in conjunction with a pressing block, spring, sliding rod, snap ball, and barbs. When the screw is screwed in, the pressing block is squeezed at the same time, and the snap ball expands outward with the barbs, embedding into the connected parts to form an interference fit and enhance the pull-out resistance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a cross-sectional view of the present invention;

[0027] Figure 3 This is an exploded view of the present invention.

[0028] In the diagram: 1. Head; 2. Anti-slip texture; 3. Fixing block; 4. Pressing block; 5. Butterfly spring; 6. Rod; 7. Thread 1; 8. Thread 2; 9. Cutting groove; 10. Annular groove; 11. Snap-fit ​​ball; 12. Barb; 13. Spring; 14. Fixing sleeve rod; 15. Sliding rod. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-3 A screw for increasing fastening performance includes a head 1 and a shank 6. The shank 6 is fixedly installed on the bottom surface of the head 1. A hexagonal hole is opened on the upper surface of the head 1. The bottom surface of the shank 6 is conical and the inside of the shank 6 is hollow.

[0031] A sliding hole is provided on the tapered inclined surface at the bottom of the rod 6 in a circular pattern;

[0032] Anti-slip components are fixedly installed on the outer periphery of the rod 6;

[0033] An expansion mechanism is installed inside the rod 6.

[0034] Furthermore, the hexagonal hole on the head 1 has triangular anti-slip texture 2 on its hole wall.

[0035] Furthermore, a stepped hole is provided below the hexagonal hole on the head 1. The hexagonal hole and the stepped hole on the head 1 are connected. The stepped hole provides installation space for the fixing block 3. The stepped surface formed by the difference in diameter can limit the axial position of the fixing block 3, ensuring that the fixing block 3 is coaxially fixed with the head 1.

[0036] Furthermore, the anti-slip component includes thread 1 7, thread 2 8, and cutting groove 9. Thread 1 7 is provided on the outer arc surface of the rod 6 corresponding to the lower part of the head 1. Thread 2 8 is provided on the outer arc surface of the rod 6 corresponding to the lower part of thread 1 7. Cutting groove 9 is provided on the outer arc surface of the rod 6 corresponding to the pitch of thread 1 7 and thread 2 8.

[0037] Thread 17 and Thread 28 are connected end to end, and the pitch of Thread 17 is greater than that of Thread 28. The large pitch design of Thread 17 can quickly position during initial screwing, while the small pitch of Thread 28 increases the friction of the thread pair during the tightening stage. The two are connected end to end to form a variable pitch structure, which makes the thread load evenly distributed from the front end to the rear end, avoiding the stress concentration problem at the front end of the traditional single pitch thread.

[0038] The cutting groove 9 is triangular.

[0039] Furthermore, a disc spring 5 is coaxially sleeved on the outer arc surface of the rod 6, corresponding to the lower part of the head 1 and the upper part of the thread 7.

[0040] Furthermore, the outer arc surface of the rod 6 is provided with an annular groove 10 corresponding to the lower part of the butterfly spring 5. The circumferential groove design of the annular groove 10 not only facilitates the threading of the metal wire to prevent loosening, but also limits the axial position of the butterfly spring 5 to prevent the spring from radially shifting during the screw screwing process. When multiple screws are used in parallel, the metal wire passes through the annular groove 10 of each screw and is tightened in a cross manner to form a mechanical interlocking structure.

[0041] Furthermore, the expansion mechanism includes a fixed block 3 and a fixed sleeve rod 14. The fixed block 3 is coaxially fixedly installed in the stepped hole on the head 1. The fixed block 3 has a stepped hole. The fixed sleeve rod 14 is coaxially fixedly installed inside the rod part 6. The outer arc surface of the fixed sleeve rod 14 has a sliding hole circumferentially opened near the bottom.

[0042] The sliding hole on the fixed sleeve 14 and the sliding hole on the bottom surface of the rod 6 are coaxially corresponding.

[0043] Furthermore, the expansion mechanism also includes a pressing block 4, a spring 13, and a sliding rod 15. A limiting plate is fixedly installed on the bottom surface of the pressing block 4, and a sliding rod 15 is fixedly installed on the bottom surface of the limiting plate. An arc groove is formed on the outer arc surface of the sliding rod 15 near the bottom. The sliding rod 15 and the fixed sleeve rod 14 are slidably connected coaxially. The pressing block 4 and the fixed block 3 are slidably connected coaxially, and the pressing block 4 protrudes from the top surface of the fixed block 3. The bottom surface of the limiting plate on the pressing block 4 is fixedly installed with the spring 13 corresponding to the periphery of the spring 13. The other end of the spring 13 is fixedly connected to the top surface of the fixed sleeve rod 14. The diameter of the limiting plate of the pressing block 4 is larger than the small diameter of the stepped hole of the fixed block 3, which can prevent the pressing block 4 from falling off the fixed block 3.

[0044] Furthermore, a snap-fit ​​ball 11 is slidably connected in the sliding hole on the fixed sleeve 14, and a barb 12 is fixedly installed on the outer circumference of the snap-fit ​​ball 11;

[0045] The arc-shaped groove on the sliding rod 15 corresponds to the snap-fit ​​ball 11.

[0046] Structural Description:

[0047] Head 1: Head 1 is the top operating part of the screw. The upper surface has a hexagonal hole to facilitate tool insertion and force application. The bottom surface is fixedly connected to the rod 6 and is the key structure for transmitting tightening torque.

[0048] Anti-slip texture 2: Anti-slip texture 2 is triangular and is formed on the wall of the hexagonal hole in head 1. It can increase the friction between the tool and the hole wall, reduce slippage, improve operational stability, and ensure effective torque transmission when tightening or loosening.

[0049] Fixed block 3: Fixed block 3 is coaxially fixed in the stepped hole of head 1. The stepped hole inside provides guidance and support for pressing block 4 and sliding rod 15. It is an important fixed foundation for expansion mechanism.

[0050] Pressing block 4: Pressing block 4 is slidably connected to fixed block 3 on the same axis. It has a limiting plate and sliding rod 15 on the bottom surface, which protrude from the top surface of fixed block 3. Pressing it with external force can push the sliding rod 15 down, so that the expansion mechanism can be activated to achieve the fastening function.

[0051] The butterfly spring 5 is coaxially sleeved on the outer arc surface of the rod 6, located below the head 1 and above the thread 7. When tightened, it generates elastic deformation, provides continuous axial pressure, enhances the anti-loosening effect, and buffers vibration.

[0052] Rod 6: The bottom of rod 6 is conical and hollow inside. It has anti-slip components on the outside and an expansion mechanism inside. It is the main connecting part of the screw. The conical bottom facilitates positioning and insertion, and the hollow structure provides installation space for the expansion mechanism.

[0053] Thread 17: Thread 17 is located below the head 1 of the outer arc surface of the rod 6. The pitch is greater than that of Thread 28. It is connected to Thread 28 end to end and works with the cutting groove 9 to make the thread contact the connected parts more tightly, optimize the load distribution, and reduce stress concentration.

[0054] Thread 28: Thread 28 is below Thread 17 and has a smaller pitch. Together with Thread 17, it forms a composite thread structure, which further enhances the friction and fastening of the thread pair and improves the connection reliability of the screw under different working conditions.

[0055] Cutting groove 9: The cutting groove 9 is triangular and is opened at the pitch of thread 7 and thread 8. It can improve the stress state of the thread teeth, increase the thread flexibility, and at the same time assist in chip removal, making the thread tightening smoother.

[0056] Annular groove 10: The annular groove 10 is opened below the butterfly spring 5 on the outer arc surface of the rod 6 and is distributed in a circle. When multiple screws are used at the same time, the metal wire can pass through and tighten, and the binding force of the metal wire prevents the screw from loosening.

[0057] Snap-fit ​​ball 11: Snap-fit ​​ball 11 is slidably connected in the sliding hole of fixed sleeve rod 14. There are barbs 12 on the outer surface. When the sliding rod 15 moves down, snap-fit ​​ball 11 is squeezed outward and embedded into the connected parts to form an interference fit and enhance the pull-out resistance.

[0058] Barb 12: Barb 12 is fixed on the outer surface of the snap ball 11. When the snap ball 11 moves outward, the barb 12 is embedded in the connected parts, increasing resistance and preventing the screw from loosening or falling off. It is the key structure for the expansion mechanism to achieve fastening.

[0059] Spring 13: Spring 13 is installed between the limiting plate of the pressing block 4 and the top surface of the fixed sleeve rod 14. When the pressing block 4 is pressed, the spring 13 is compressed. After the external force is removed, the spring 13 is reset, so that the expansion mechanism can be operated repeatedly and the flexibility of the structure is guaranteed.

[0060] Fixed sleeve 14: Fixed sleeve 14 is coaxially fixed inside the rod 6. There is a sliding hole near the bottom of the outer circle surface, which is coaxially corresponding to the sliding hole on the bottom surface of the rod 6. It provides a sliding track for the snap ball 11 and is the support frame of the expansion mechanism.

[0061] Sliding rod 15: The sliding rod 15 is slidably connected to the fixed sleeve rod 14 on the same axis. The outer surface has an arc groove, which corresponds to the locking ball 11. When pushed down by the pressing block 4, the locking ball 11 is guided to move outward through the arc groove to achieve stability.

[0062] Working principle: When an internal hex wrench is inserted into the hexagonal hole of head 1, the friction between the wrench and head 1 is increased due to the triangular anti-slip texture 2 on the hole wall, making it easier to apply force to initially screw the screw into the connected parts. The bottom surface of the rod 6 is conical, which facilitates positioning and insertion. During the screwing process, the anti-slip components on the periphery of the rod 6 begin to play their role. Thread 1 7 and Thread 2 8 are connected end to end and have different pitches. Together with the triangular cutting groove 9, the threads make closer contact with the connected parts, the load distribution is more uniform, and local stress concentration is reduced. At the same time, the cutting groove 9 can also assist in chip removal, making the screwing smoother.

[0063] When the screw is screwed in, the butterfly spring 5 below the head 1 is compressed, producing elastic deformation, which provides continuous axial pressure to the screw, enhances the anti-loosening effect, and buffers vibration. The annular groove 10 below the butterfly spring 5 allows the wire to pass through and tighten when multiple screws are used at the same time, and the binding force of the wire prevents the screw from loosening.

[0064] As the screw is screwed in, the pressing block 4 slides downward under the pressure of the wrench. The limiting plate on the bottom surface of the pressing block 4 moves the sliding rod 15 downward together. The arc groove near the bottom of the outer arc surface of the sliding rod 15 moves downward accordingly. The retaining ball 11 on the fixing sleeve 14, which was originally located in the sliding hole, expands outward from the sliding hole at the bottom of the fixing sleeve 14 and the rod 6 under the push of the sliding rod 15 when the arc groove of the sliding rod 15 moves to the position corresponding to the retaining ball 11. The barbs 12 on the outer arc surface of the retaining ball 11 will embed into the connected parts, forming an interference fit. The combination enhances the screw's pull-out resistance. During this process, when the pressing block 4 is pressed down, the spring 13 is compressed and stores elastic potential energy. When the external force is removed, the spring 13 pushes the pressing block 4 to reset, allowing the expansion mechanism to operate repeatedly and ensuring the flexibility of the structure. The fixing block 3 is coaxially fixed in the stepped hole of the head 1, providing guidance and support for the pressing block 4 and the sliding rod 15, ensuring that they can slide up and down stably. The fixing sleeve rod 14 is coaxially fixed inside the rod part 6, providing a sliding track for the snap-fit ​​ball 11, allowing the snap-fit ​​ball 11 to expand outward accurately.

[0065] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw that enhances fastening performance, characterized in that, include: The head (1) and the rod (6) are fixedly installed on the bottom surface of the head (1). The upper surface of the head (1) is provided with a hexagonal hole. The bottom surface of the rod (6) is conical and the inside of the rod (6) is hollow. The bottom of the rod (6) has a sliding hole circumferentially opened on the conical inclined surface; An anti-slip component is fixedly provided on the periphery of the rod (6); An expansion mechanism is provided inside the rod (6).

2. The screw for increasing fastening performance according to claim 1, characterized in that, The hexagonal hole on the head (1) has triangular anti-slip texture (2) on its hole wall.

3. A screw for increasing fastening performance according to claim 2, characterized in that, A stepped hole is provided below the hexagonal hole on the head (1), and the hexagonal hole and the stepped hole on the head (1) are connected.

4. A screw for increasing fastening performance according to claim 1, characterized in that, The anti-slip component includes thread one (7), thread two (8), and cutting groove (9). The outer arc surface of the rod (6) is provided with thread one (7) below the head (1). The outer arc surface of the rod (6) is provided with thread two (8) below the thread one (7). The outer arc surface of the rod (6) is provided with cutting groove (9) at the pitch of the thread one (7) and the thread two (8). The first thread (7) and the second thread (8) are connected end to end, and the pitch of the first thread (7) is greater than the pitch of the second thread (8). The cutting groove (9) is triangular.

5. A screw for increasing fastening performance according to claim 4, characterized in that, A butterfly spring (5) is coaxially sleeved on the outer arc surface of the rod (6) corresponding to the lower part of the head (1) and the upper part of the thread (7).

6. A screw for increasing fastening performance according to claim 5, characterized in that, The outer arc surface of the rod (6) is provided with an annular groove (10) corresponding to the lower part of the butterfly spring (5).

7. A screw for increasing fastening performance according to claim 3, characterized in that, The expansion mechanism includes a fixed block (3) and a fixed sleeve (14). The fixed block (3) is coaxially fixed in the stepped hole on the head (1). The fixed block (3) has a stepped hole. The fixed sleeve (14) is coaxially fixed in the inside of the rod (6). The outer arc surface of the fixed sleeve (14) has a sliding hole in a circle near the bottom. The sliding hole on the fixed sleeve (14) and the sliding hole on the bottom surface of the rod (6) are coaxially corresponding.

8. A screw for increasing fastening performance according to claim 7, characterized in that, The expansion mechanism also includes a pressing block (4), a spring (13), and a sliding rod (15). A limiting plate is fixedly installed on the bottom surface of the pressing block (4), and a sliding rod (15) is fixedly installed on the bottom surface of the limiting plate. An arc groove is provided on the outer arc surface of the sliding rod (15) near the bottom. The sliding rod (15) and the fixed sleeve rod (14) are slidably connected coaxially. The pressing block (4) and the fixed block (3) are slidably connected coaxially. The pressing block (4) protrudes from the top surface of the fixed block (3). A spring (13) is fixedly installed on the bottom surface of the limiting plate on the pressing block (4) corresponding to the periphery of the spring (13). The other end of the spring (13) is fixedly connected to the top surface of the fixed sleeve rod (14).

9. A screw for increasing fastening performance according to claim 8, characterized in that, A snap-fit ​​ball (11) is slidably connected in the sliding hole on the fixed sleeve (14), and a barb (12) is fixedly installed on the outer circular surface of the snap-fit ​​ball (11). The arc groove on the sliding rod (15) corresponds to the snap-fit ​​ball (11).

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