Hexagonal socket set screw with flat end

Abstract

The utility model discloses an inner hexagonal flat-end set screw, which comprises a rod body provided with external threads, and is characterized in that a boss is fixed at one end of the rod body, a hexagonal counter bore is formed in the center of the boss, and an even number of operation grooves are uniformly formed in the edge of the boss in the circumferential direction; the screw has the advantages that the problem that an existing screw is prone to hexagonal sliding is effectively solved, the screw is more convenient to operate, higher in connection stability and safety and suitable for fastening connection of various mechanical devices and structures, and more reliable use experience is provided for a user.

Description

Technical Field

[0001] The utility model relates to a screw, in particular to a hexagon socket flat-end set screw. Background Art

[0002] In the field of mechanical manufacturing, hexagon socket flat point set screws are a commonly used fastener and are widely used in various mechanical equipment and structures. However, there is a problem during use. When using hexagon socket flat point set screws, due to poor contact or insufficient friction between the threaded part and the twisting tool, the tool cannot be firmly fixed in the hexagonal groove of the threaded hole when torque is applied. As a result, the tool may slide or rotate instead of being firmly connected to the threaded hole, resulting in the screw cannot be tightened or loosened smoothly.

[0003] This problem may be caused by a variety of factors, including insufficient surface roughness of the screw and nut, improper operation of the operator resulting in incorrect insertion of the tool into the inner hole of the nut, and insufficient lubrication. When the screw is in this hexagonal sliding state, it will not only increase the difficulty of tightening or loosening the screw, but may also cause the threaded connection to be loose, affecting the stability and safety of the equipment.

[0004] Although some improvement measures have been proposed, such as optimizing thread design and changing material selection, these measures often fail to completely solve the hexagonal sliding problem and have limited effects in practical applications. Therefore, finding a more effective solution to improve the performance and reliability of hexagon socket flat point set screws is of great significance to the field of mechanical manufacturing. Utility Model Content

[0005] The purpose of the utility model is to provide a hexagon socket flat-point set screw in response to the above-mentioned problem, which effectively solves the problem that the existing screws are prone to hexagonal sliding. This screw is not only more convenient to operate, but also has higher connection stability and safety. It is suitable for fastening connections of various mechanical equipment and structures, providing users with a more reliable use experience.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a hexagon socket flat-end set screw, comprising a rod body with an external thread, a boss fixed at one end of the rod body, a hexagonal countersunk hole is arranged at the center of the boss, and an even number of operating grooves are evenly opened around the edge of the boss.

[0007] Preferably, the operating groove is an arc-shaped groove structure, and the arc length of each operating groove is less than half of the boss radius.

[0008] Preferably, a guide cone column is fixed to the other end of the rod body, and the outer side wall of the guide cone column is a smooth surface.

[0009] Preferably, the end of the guide cone is concave to form a recessed area.

[0010] Preferably, the length of the guide cone column is 20% to 35% of the length of the rod body, and the cone angle of the guide cone column is between 3° and 8°.

[0011] Preferably, a plurality of grooves extending in a spiral form are evenly arranged on the side wall of the rod body, one end of the groove is connected to the corresponding operating groove, and the other end of the groove extends to the end of the guide cone column.

[0012] Preferably, the edge of the hexagonal countersunk hole is greater than 3 mm away from the edge of the boss.

[0013] Preferably, the outer surface of the rod body is coated with an anti-rust layer, and the outer surface of the guide cone column is coated with a wear-resistant layer.

[0014] Compared with the prior art, the advantages of the utility model are: the boss at one end of the rod body not only enhances the structural strength of the entire screw, enabling it to withstand a greater tightening force, but also the boss increases the support area of ​​the screw head, which helps to evenly disperse the force during tightening and reduce damage to the surface of the fixed object or stress concentration, especially in applications with large loads or vibrations; the hexagonal countersunk hole in the center of the boss is designed to cooperate with a hexagonal wrench, which can efficiently perform tightening and disassembly operations, and its standardized shape is also easy to operate with common tools; and the operating groove on the edge of the boss provides an additional grip point, which increases the flexibility of the set screw operation, especially when the tightening space is limited or the operating means are limited, the operating groove provides convenience for the construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. It is obvious that the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 This is a three-dimensional structure diagram of the utility model. Figure 1 ;

[0017] Figure 2 This is a three-dimensional structure diagram of the utility model. Figure 2 ;

[0018] Figure 3 It is a bottom view of the utility model;

[0019] In the figure, 1, rod body; 2, external thread; 3, boss; 4, hexagonal countersunk hole; 5, operating groove; 6, guide cone column; 7, recessed area; 8, groove; 9, anti-rust layer; 10, wear-resistant layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1: As shown in the figure, a hexagon socket flat-end set screw comprises a rod body 1 with an external thread 2, a boss 3 is fixed to one end of the rod body 1, a hexagonal countersunk hole 4 is arranged at the center of the boss 3, and an even number of operating grooves 5 are evenly opened around the edge of the boss 3.

[0022] Embodiment 2: As shown in the figure, the difference from Embodiment 1 is that the operating groove 5 is an arc-shaped groove structure, and the arc length of each operating groove 5 is less than half of the radius of the boss 3.

[0023] In the above structure, these operating grooves 5 are arranged on the circumference of the edge of the boss 3. The design of an even number of grooves makes the application of force more uniform, thereby improving the stability of the overall operation. Since the arc length of each operating groove 5 is less than half the radius of the boss 3, this means that these operating grooves 5 are symmetrically distributed on the boss 3, and each groove provides sufficient space to adapt to appropriate tools, such as a screwdriver or a hook wrench, so that it is possible to apply and transmit force at different angles. When space is limited or tightening at a specific angle, this design allows the operator to find a suitable operating angle more easily, reducing the difficulty of operation. At the same time, since the grooves are arc-shaped, they naturally adapt to the shape of the force-bearing tools and hands, reducing sliding and operating inconvenience during construction, and improving tightening efficiency and installation speed.

[0024] In this embodiment, a guide cone column 6 is fixed to the other end of the rod body 1, and the outer side wall of the guide cone column 6 is a smooth surface.

[0025] In the above structure, the presence of the guide cone column 6 enables the screw to have a better initial positioning function, which is convenient for precise assembly. For some complex mechanical structures or situations where the space is narrow and the operating space is small, the guide cone column 6 can help to quickly and accurately position, avoiding possible deviation during the initial installation, reducing assembly time and improving work efficiency.

[0026] The outer wall of the guide cone 6 is mainly a smooth surface. This design substantially reduces the friction during installation. On the one hand, the smooth surface can reduce the friction between the screw and the hole wall, making the screw easier to screw in or out, reducing the difficulty of operation. On the other hand, the smooth surface can also reduce the wear of the tool on the screw and extend the service life of the fastener.

[0027] In addition, such a design also allows the guide cone 6 to play a good protective role. Its protection of the outer surface avoids possible damage caused by direct contact. For example, when using impact tools for tightening or unloading, it can prevent the screw head from being deformed or damaged, so that there will be no problems in its subsequent use. Therefore, the hexagon socket flat-point set screw achieves efficient and accurate assembly through the design of the guide cone 6 and the smooth surface, simplifies the tightening process, reduces the difficulty of operation, and effectively protects the workpiece, ensuring high-quality work performance.

[0028] Embodiment 3: As shown in the figure, the difference from Embodiment 2 is that the end of the guide cone 6 is concave to form a recessed area 7.

[0029] The concave recessed area 7 essentially plays a role of centralized guidance and self-positioning. When the screw is guided to the corresponding hole, the recessed area 7 helps to absorb small errors and alignment, ease the first contact between the screw and the part, and avoid direct impact and damage to the alignment surface during assembly, thereby improving the initial accuracy of fastening. In addition, the presence of the recessed area 7 during the tightening process improves the pressure distribution between the screw and the force point. When the tightening force is transmitted through the rod body 1, the recessed area 7 can effectively disperse the force more evenly to a wider area, reducing deformation or damage to parts caused by excessive local pressure during the tightening process.

[0030] During the disassembly and assembly process, this recessed area 7 also plays an important role. If the screw is stuck due to long-term use or rust during disassembly, the recessed area can serve as a groove 8 for concentrating the lubricant, which facilitates the lubricant to better penetrate into the threaded contact surface and alleviates the difficulty of removing the screw.

[0031] In this embodiment, the length of the guide cone column 6 is 20% to 35% of the length of the rod body 1, and the cone angle of the guide cone column 6 is between 3° and 8°.

[0032] In the above structure, the carefully designed parameter of the cone angle between 3° and 8° provides obvious operational and functional advantages for the screw. This length ratio ensures that the guide cone column 6 is long enough to effectively guide the screw to correctly align with the threaded hole of the connected part, thereby reducing friction and damage risks during installation; at the same time, this length range also avoids the guide cone column 6 being too long to affect the overall strength and rigidity of the fastener.

[0033] The cone angle is set between 3° and 8°, which balances the guiding performance and the cone strength. A smaller cone angle can enhance the guiding performance, ensuring that the screw can be smoothly and accurately inserted into the predetermined threaded hole, while avoiding the installation difficulties or poor insertion caused by an excessively large cone angle. At the same time, this cone angle range also fully considers the manufacturing feasibility and cost control, ensuring that the guiding cone column 6 will not weaken its guiding stability and strength during the tightening process due to its too small size.

[0034] In this embodiment, a plurality of grooves 8 extending in a spiral form are evenly formed on the side wall of the rod body 1 , one end of the groove 8 is connected to the corresponding operating groove 5 , and the other end of the groove 8 extends to the end of the guide cone column 6 .

[0035] First, there are four grooves 8, and their spiral shape increases the surface area of ​​the rod body 1, which helps to improve the friction interface between the screw and the fastened component, making the screw easier to install and remove. Secondly, the design of the groove 8 connecting the operating groove 5 and the guide cone 6 can effectively guide and transmit the force applied to the screw, ensure the uniform distribution of force when the screw is screwed in, and reduce damage to the threaded hole. In addition, this groove 8 can accumulate lubricant during installation or removal, provide lubrication for the tightening and loosening of the screw, reduce wear and screw force, and promote the discharge of any tiny particles generated during use to keep the thread clean. In application, when the rod body 1 is subjected to a tightening torque, these spiral grooves 8 can also play a certain torque distribution function, further improving the reliability of tightening.

[0036] In this embodiment, the edge of the hexagonal countersunk hole 4 is greater than 3 mm away from the edge of the boss 3 .

[0037] On the one hand, this spacing can provide sufficient material around the hexagonal countersunk hole 4, increasing the contact area between the boss 3 and the material around the countersunk hole, which not only improves the strength and stability of the force-bearing part of the screw, but also increases the shear resistance of the entire assembly structure. Therefore, during the screw tightening process, the larger boss 3 edge spacing helps to disperse the pressure generated by the torque, which can effectively avoid damage or deformation of the boss 3 material due to excessive force, thereby ensuring the durability and service life of the set screw.

[0038] In this embodiment, the outer surface of the rod body 1 is coated with an anti-rust layer 9 , and the outer surface of the guide cone column 6 is coated with a wear-resistant layer 10 .

[0039] In the design of the hexagon socket flat-point set screw, the anti-rust layer 9 on the outer surface of the rod body 1 and the wear-resistant layer 10 on the outer surface of the guide cone 6 play a key protective role. The anti-rust layer 9 coated on the rod body 1 can effectively prevent moisture and oxygen erosion, and prevent the screw from rusting during long-term use or in a humid environment, thereby ensuring its mechanical strength and connection reliability. This protective film not only extends the service life of the set screw, but also reduces maintenance costs and enhances the applicability of the fastener in different environments.

[0040] For the outer surface of the guide cone 6, the wear-resistant layer 10 coated thereon provides additional hardness and wear resistance, protecting the cone from wear during repeated insertion and tightening. Since the guide cone 6 is the first part to contact the workpiece when installing the screw, the wear-resistant layer 10 can reduce the wear caused by friction between the cone and the inner diameter of the hole, reduce dimensional changes or shape damage caused by wear, and ensure guiding accuracy. In addition, the wear-resistant layer 10 not only improves the surface finish of the guide cone 6, but also helps to reduce torque resistance during installation, further improving the efficiency and comfort of installation.

[0041] The anti-rust layer 9 can be a zinc layer, a nickel layer or a chromium layer, or a protective oil film can be coated on the surface of the screw to temporarily prevent rust. The material of the wear-resistant layer 10 can be titanium carbide, titanium nitride or molybdenum disulfide.

[0042] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A hexagon socket flat-point set screw, comprising a rod body provided with an external thread, characterized in that: A boss is fixed at one end of the rod body, a hexagonal countersunk hole is arranged at the center of the boss, and an even number of operating grooves are evenly arranged in the circumferential direction of the edge of the boss.

2. A hexagon socket flat point set screw according to claim 1, characterized in that: The operating groove is an arc-shaped groove structure, and the arc length of each operating groove is less than half of the boss radius.

3. The hexagon socket flat point set screw according to claim 1, characterized in that: A guide cone column is fixed on the other end of the rod body, and the outer side wall of the guide cone column is a smooth surface.

4. A hexagon socket flat point set screw according to claim 3, characterized in that: The end of the guide cone column is concave to form a concave area.

5. The hexagon socket flat point set screw according to claim 3, characterized in that: The length of the guide cone column is 20% to 35% of the length of the rod body, and the cone angle of the guide cone column is between 3° and 8°.

6. The hexagon socket flat point set screw according to claim 3, characterized in that: A plurality of grooves extending in a spiral manner are evenly arranged on the side wall of the rod body, one end of the groove is connected to the corresponding operating groove, and the other end of the groove extends to the end of the guide cone column.

7. The hexagon socket flat point set screw according to claim 1, characterized in that: The edge of the hexagonal countersunk hole is greater than 3 mm away from the edge of the boss.

8. The hexagon socket flat point set screw according to claim 3, characterized in that: The outer surface of the rod body is coated with an anti-rust layer, and the outer surface of the guide cone column is coated with a wear-resistant layer.

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