High-strength corrosion-resistant screw fastener

Abstract

The high-strength corrosion-resistant screw fastener comprises a screw rod and a screw head fixed to the top of the screw rod, a movable opening is formed in the screw rod, limiting blocks are relatively and rotationally installed in the movable opening, and the outer side walls of the limiting blocks are jointly connected with a limiting spring. The outer side walls of the limiting blocks on the two sides can turn into the movable openings under the stress condition and rebound out, and the opposite sides of the two limiting blocks are jointly and movably connected with a telescopic part. The limiting block is pushed to turn over to the outside of the movable opening through the acting force of the limiting spring, under the action of the movable rod, the limiting block is prevented from being stressed to automatically and continuously turn over towards the outer side, and at the moment, the screw rod is reversely rotated and is limited and fixed under the action of the limiting block, so that the external screw head cannot be disassembled, and meanwhile, the thread is timely and movably screwed; and through the arrangement of the locking block and the hard buffering cushion, the fixing effect is further improved in cooperation with the hard buffering cushion.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically a high-strength corrosion-resistant screw fastener. Background Technology

[0002] High-strength, corrosion-resistant screws are widely used in aerospace, automotive manufacturing, marine engineering, petrochemicals, and electronic equipment industries. Their operating principle is primarily based on threaded connections and the application of preload. Through the mechanical engagement of the threads, the screw can tightly fasten two or more objects together, forming a stable connection. During the connection process, applying an appropriate torque generates a preload on the screw, thus creating sufficient friction between the connected parts to ensure the strength and reliability of the connection. This fastening method is not only easy to operate but also allows for disassembly and reinstallation as needed, offering high flexibility and maintainability.

[0003] Currently, common screw fasteners on the market have some problems in practical applications: On the one hand, most screws do not have anti-disassembly function. For some special safety installation requirements, such as situations where screws can only be disassembled from the inside and not from the outside, traditional screws are difficult to meet. On the other hand, traditional screws are easily affected by the internal and external threads during the tightening process. Once the threads are damaged, the fixed screw will be pulled out directly, thereby affecting the safety and stability of the equipment or structure.

[0004] Therefore, a high-strength corrosion-resistant screw fastener is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength, corrosion-resistant screw fastener to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-strength corrosion-resistant screw fastener, comprising a screw rod and a screw head fixed at its top, wherein the screw rod has a movable opening inside, and limit blocks are rotatably installed inside the movable opening. The outer walls of the limit blocks are connected to a limit spring. Under force, the outer walls of the two limit blocks will flip into the movable opening, and conversely, pop out. The opposite sides of the two limit blocks are movably connected to a telescopic part, which controls the outward flipping angle of the two limit blocks and prevents the force-bearing parts of the two limit blocks from unfolding to the sides when subjected to force.

[0007] Preferably, a rigid buffer pad is provided above both of the limiting blocks, and a locking block is provided on the top of the rigid buffer pad. The locking block is threadedly connected to the wall of the screw.

[0008] Preferably, each of the two limiting blocks has a groove on one side, and a limiting spring is connected to the interior of the two grooves. The screw is made of high-strength steel and has an electroplated layer on its outer wall.

[0009] Preferably, the telescopic part is a movable rod, and both ends of the movable rod are connected to connectors. The outer walls of the two connectors are rotatably connected to connecting seats, and the two connecting seats are respectively fixedly installed on corresponding limiting blocks.

[0010] Preferably, the outer sidewalls of the screw head are provided with T-slots, and sliders are movably connected inside the two T-slots. The outer sidewalls of the two sliders are connected with flip blocks, and a sealing cap matching the outer sidewall of the screw head is installed on one side of the two flip blocks.

[0011] Preferably, the outer side wall of the screw head is provided with two sets of flipping grooves and retaining grooves. Moving the flipping block and the sealing cover drives the slider to move to the flipping groove position and flip it, so that the outer side wall of the sealing cover just fits against the side wall of the retaining groove, thereby achieving disassembly and protection.

[0012] Preferably, the top of the screw head has two layers of cross grooves with the groove diameter increasing from the inside to the outside, and the four corners of the top of the screw head are provided with fixing holes to assist in fixing or disassembling, and the lower end of the screw is provided with a conical groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] After the thread is fixed, the limiting spring pushes the limiting block to the outside of the movable opening. Under the action of the movable rod, the limiting block is prevented from automatically continuing to flip outward. At this time, the screw is rotated in the opposite direction and the limiting block limits and fixes the screw, so that the external screw head cannot be disassembled. At the same time, even if the thread is loose, the screw cannot be pulled out, which is highly safe.

[0015] Secondly, by setting up locking blocks and hard buffer pads, after the screws are fixed, the locking blocks are rotated to push the hard buffer pads to move towards the force-bearing surface outside the limit block. The locking blocks are then further tightened by reverse threading, which, together with the hard buffer pads, further improves the fixing effect.

[0016] 3. In order to improve the anti-corrosion effect of the screw head and prevent the screw head from rusting and making subsequent disassembly inconvenient, this utility model flips the sealing cover and flipping block along the inside of the flipping groove so that they are aligned with the vertical direction of the T-slot. Pushing them causes the slider to slide down the T-slot to the designated position. At this time, under the limit of the T-slot, the flipping block and sealing cover cannot flip automatically and are fitted onto the outside of the screw head, thereby protecting the outer wall of the screw head and improving its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the limiting component structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0020] Figure 4 This is a partial exploded structural diagram of the present invention.

[0021] In the diagram: 1. Screw; 2. Screw head; 3. Movable port; 4. Limit block; 5. Limit spring; 6. Movable rod; 7. Connector; 8. Connecting seat; 9. Groove; 10. Locking block; 11. Hard buffer pad; 12. T-slot; 13. Slider; 14. Flip groove; 15. Flip block; 16. Sealing cap; 17. Cross groove; 18. Fixing hole; 19. Stop groove; 20. Conical groove. Detailed Implementation

[0022] 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.

[0023] Example 1: Please refer to Figure 1-4 This utility model provides a technical solution: a high-strength corrosion-resistant screw fastener, including a screw rod 1 and a screw head 2 fixed on its top. The screw rod 1 has a movable opening 3 inside, and a limiting block 4 is rotatably installed inside the movable opening 3. The outer walls of the limiting blocks 4 are connected to a limiting spring 5. Under force, the outer walls of the two limiting blocks 4 will flip into the movable opening 3, and conversely, pop out. The opposite sides of the two limiting blocks 4 are movably connected to a telescopic part. The limiting spring 5 pushes the limiting blocks 4 to flip to the outside of the movable opening 3. Under the action of the movable rod 6, the limiting blocks 4 are prevented from automatically flipping outward under force. At this time, the screw rod 1 is rotated in the opposite direction and limited and fixed under the action of the limiting blocks 4, so that the screw head 2 outside cannot be disassembled. At the same time, even if the thread is loose, the screw cannot be pulled out. The safety is high. The outward flipping angle of the two limiting blocks 4 is controlled and limited to prevent the force-bearing parts of the two limiting blocks 4 from unfolding to the sides when under force.

[0024] In this embodiment, a hard buffer pad 11 is provided above the two limiting blocks 4. A locking block 10 is provided on the top of the hard buffer pad 11. The locking block 10 is threadedly connected to the wall of the screw 1. After the screw is fixed by the setting of the locking block 10 and the hard buffer pad 11, the hard buffer pad 11 is pushed to move to the force-bearing surface outside the limiting block 4 by rotating the locking block 10. The locking block 10 is further threadedly locked in the opposite direction. The fixing effect is further improved by the hard buffer pad 11. The pad is plated with nickel or zinc.

[0025] Each of the two limiting blocks 4 has a groove 9 on one side of its opposite side. The two grooves 9 are connected together to a limiting spring 5. The screw is made of high-strength steel and has an electroplated layer on its outer wall. The electroplated layer further improves the corrosion resistance of the fastener.

[0026] In this embodiment, the telescopic part is a movable rod 6, and both ends of the movable rod 6 are connected to connectors 7. The outer walls of the two connectors 7 are rotatably connected to connector seats 8, and the two connector seats 8 are respectively fixedly installed on the corresponding limit blocks 4.

[0027] In this embodiment, T-slots 12 are provided on the outer side walls of the screw head 2, and sliders 13 are movably connected inside the two T-slots 12. A flipping block 15 is connected to the outer side wall of the two sliders 13, and a sealing cap 16 matching the outer side wall of the screw head 2 is installed on one side of the two flipping blocks 15.

[0028] In this embodiment, two sets of flipping grooves 14 and blocking grooves 19 are provided on the outer side wall of the screw head 2. Moving the flipping block 15 and the sealing cover 16 drives the slider 13 to move to the position of the flipping groove 14 and flip it, so that the outer side wall of the sealing cover 16 just fits against the side wall of the blocking groove 19, thereby achieving disassembly and protection.

[0029] The top of the screw head 2 has two layers of cross grooves 17 with the groove diameter increasing from the inside to the outside. The four corners of the top of the screw head 2 are provided with fixing holes 18 to assist in fixing or disassembling. The lower end of the screw rod 1 is provided with a conical groove 20. The double-layered cross grooves 17 facilitate the disassembly of the screw, while the fixing holes 18 allow for disassembly in other ways.

[0030] The working principle is as follows: In actual use, check whether each part of the screw fastener is intact and confirm that the material and size of the installation position are suitable for the screw. When installing, first align the screw rod 1 with the installation hole, and use a tool to screw it in through the cross groove 17 or fixing hole 18 on the top of the screw head 2. The conical groove 20 at the lower end of the screw rod 1 facilitates the guidance and positioning. As the screw rod 1 is screwed in, the limiting block 4 pops out the movable opening 3 under the action of the limiting spring 5. The movable rod 6 restricts its flipping angle. After installation, rotate the locking block 10 to push the hard buffer pad 11 to press the limiting block 4, further improving the fixing effect. Then, move the flipping block 15 and the sealing cover 16 along the T-slot 12 to the flipping groove 14 position and flip it so that the sealing cover 16 fits the retaining groove 19 to protect the screw head 2.

[0031] When disassembly is required, first flip the sealing cover 16 and the flipping block 15 back to the direction of the T-slot 12 and move them to the initial position. Then, use a special tool to push open the limiting block 4 from the inside and retract it into the movable opening 3. Only then can the screw head 2 be rotated in the opposite direction to remove the screw, preventing external disassembly and ensuring safety.

[0032] 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 high-strength corrosion-resistant screw fastener comprising a screw shank (1) and a screw head (2) fixed to the top of the shank, characterized in that: The screw (1) has an internal movable opening (3). The movable opening (3) is rotatably mounted with a limiting block (4). The outer walls of the limiting blocks (4) are connected to a limiting spring (5). When the two limiting blocks (4) are under force, the outer walls will flip into the movable opening (3) and pop out. The two limiting blocks (4) are connected to a telescopic part on opposite sides to control the outward flip angle of the two limiting blocks (4) and prevent the force-bearing parts of the two limiting blocks (4) from unfolding to the sides when under force.

2. A high-strength corrosion-resistant screw fastener according to claim 1, characterized in that: A hard buffer pad (11) is provided above both of the two limiting blocks (4), and a locking block (10) is provided on the top of the hard buffer pad (11). The locking block (10) is threadedly connected to the rod wall of the screw (1).

3. A high-strength corrosion-resistant screw fastener according to claim 2, characterized in that: The two limiting blocks (4) are provided with grooves (9) on opposite sides, and the two grooves (9) are connected together with a limiting spring (5). The screw is made of high-strength steel and the outer wall of the screw is provided with an electroplated layer.

4. A high-strength corrosion-resistant screw fastener according to claim 1, characterized in that: The telescopic part is a movable rod (6), and both ends of the movable rod (6) are connected to connectors (7). The outer walls of the two connectors (7) are rotatably connected to connectors (8), and the two connectors (8) are respectively fixedly installed on the corresponding limit blocks (4).

5. A high-strength corrosion-resistant screw fastener according to claim 1, wherein: The outer side wall of the screw head (2) is provided with T-shaped grooves (12) respectively. The two T-shaped grooves (12) are movably connected with sliders (13). The outer side wall of the two sliders (13) is connected with a flipping block (15). A sealing cap (16) matching the outer side wall of the screw head (2) is installed on one side of the two flipping blocks (15).

6. A high-strength corrosion-resistant screw fastener according to claim 5, characterized in that: The outer side wall of the screw head (2) is provided with two sets of flip grooves (14) and retaining grooves (19). Moving the flip block (15) and the sealing cover (16) drives the slider (13) to move to the position of the flip groove (14) and flip it, so that the outer side wall of the sealing cover (16) fits just against the side wall of the retaining groove (19), thus achieving disassembly and protection.

7. A high-strength corrosion-resistant screw fastener according to claim 6, characterized in that: The top of the screw head (2) is provided with two layers of cross grooves (17) with the groove diameter increasing from the inside to the outside. The four corners of the top of the screw head (2) are provided with fixing holes (18) to assist in fixing or disassembling. The lower end of the screw rod (1) is provided with a conical groove (20).

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