Pre-loading tightening torque screw

Abstract

The utility model provides a preloaded tightening torque screw, and belongs to the technical field of screws. Comprising a bolt cap and a threaded column, a deformation elastic piece is fixedly installed at the bottom of the bolt cap, four stress pieces are fixedly installed at the bottom of the deformation elastic piece, the four stress pieces are arranged at equal circumferential distances, a mounting base fixedly penetrates through the interior of the bolt cap, and the bottom of the mounting base is fixedly connected with the top of the threaded column. The outer wall of the threaded column is in threaded connection with a nut, a concave groove is formed in the nut, the top of the mounting base is in threaded connection with a threaded rod, and a containing groove is formed in the mounting base. Through the arrangement of the deformation elastic piece and the stress piece, the preloading tightening torque can provide more stable and controllable tightening torque for the bolt cap and the threaded column, it is ensured that the bolt cap and the threaded column are not prone to loosening in the using process, and better assembling performance and reliability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, and particularly relates to a preloaded tightening torque screw. Background Technique

[0002] A screw is a general term for a fastener. A screw is a tool that uses the physical and mathematical principles of the inclined plane circular rotation and friction of an object to gradually tighten the machine parts of an object.

[0003] Ordinary screws cannot accurately control the tightening torque during installation, which easily leads to being too loose or too tight, is not conducive to the stability and reliability of the product, and is prone to loosening after long-term use, requiring frequent inspection and re-tightening, increasing the maintenance cost and risk. Therefore, this application provides a preloaded tightening torque screw to meet the requirements. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a preloaded tightening torque screw to solve the problems that ordinary screws cannot accurately control the tightening torque during installation, which easily leads to being too loose or too tight, is not conducive to the stability and reliability of the product, is prone to loosening after long-term use, requires frequent inspection and re-tightening, and increases the maintenance cost and risk as mentioned in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A preloaded tightening torque screw includes a bolt head and a threaded column. A deformable elastic piece is fixedly installed at the bottom of the bolt head. Four stress pieces are fixedly installed at the bottom of the deformable elastic piece. The four stress pieces are arranged at equal circumferential distances. A mounting seat is fixedly penetrated inside the bolt head. The bottom of the mounting seat is fixedly connected to the top of the threaded column. A nut is threadedly connected to the outer wall of the threaded column. A concave groove is opened inside the nut. A threaded rod is threadedly connected to the top of the mounting seat. A placement groove is arranged inside the mounting seat. A pressing ball is arranged at the bottom of the threaded rod. Three anti-slip balls are arranged at the bottom of the pressing ball. Three spherical grooves are opened on the outer wall of the mounting seat. The three anti-slip balls are respectively arranged on one side of the spherical grooves, and part of the anti-slip balls are located inside the placement groove. An annular groove is opened on the outer wall of the mounting seat. An elastic ring is arranged inside the annular groove. The elastic ring is arranged at a position close to the bottom on the outer wall of the anti-slip ball.

[0007] Preferably, a hexagonal groove is opened at the top of the threaded rod.

[0008] Preferably, a circular chamfer is opened at the top edge of the hexagonal groove.

[0009] Preferably, the bottom of the threaded rod is frustum-shaped.

[0010] Preferably, the three anti-slip balls are of the same size.

[0011] Preferably, a circular chamfer is provided at the edge of the spherical groove.

[0012] Preferably, the size of the extrusion ball is the same as that of the anti-slip ball.

[0013] Preferably, the elastic ring is located on one side of the spherical groove.

[0014] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0015] In the above solution, by providing the deformation elastic sheet and the stress sheet, the preloading tightening torque can provide a more stable and controllable tightening torque for the bolt cap and the threaded column, ensuring that the bolt cap and the threaded column are not easily loosened during use, and having better assembly performance and reliability.

[0016] By providing three movable anti-slip balls, the parts of the anti-slip balls exposed from the spherical grooves are stuck on the lower surface of the plate body. Since the outer wall of the anti-slip ball is in contact with the lower surface of the plate body and exerts a certain pressure, the friction between the anti-slip ball and the plate body is large, making it difficult for the anti-slip ball and the mounting seat to rotate relative to the plate body, thereby preventing the bolt cap from rotating relative to the plate body, improving the firmness of the installation of the bolt cap, threaded column and nut, and avoiding loosening and falling off during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings incorporated herein and constituting a part of this specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0018] Figure 1 Schematic three-dimensional structure diagram of the preloading tightening torque screw;

[0019] Figure 2 Schematic structure diagram of the preloading tightening torque screw before installation;

[0020] Figure 3 Schematic structure diagram of the preloading tightening torque screw during installation;

[0021] Figure 4 Schematic three-dimensional internal structure diagram of the mounting seat.

[0022] [Reference Numerals]

[0023] 1, bolt cap; 2, deformation elastic sheet; 3, stress sheet; 4, mounting seat; 5, threaded column; 6, nut; 7, concave groove; 8, threaded rod; 9, hexagonal groove; 10, extrusion ball; 11, anti-slip ball; 12, spherical groove; 13, circular ring groove; 14, elastic ring.

[0024] As shown in the figure, in order to clearly implement the structure of the embodiments of the present utility model, specific structures and devices are marked in the figure. However, this is only for schematic purposes and is not intended to limit the present utility model to such specific structures, devices and environments. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included within the scope of the appended claims. Detailed implementation manners

[0025] The following describes in detail a preloaded tightening torque screw provided by the present utility model in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present utility model.

[0026] It should be noted that the embodiments indicated by terms such as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments" in the specification may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. Additionally, when combining embodiments to describe specific features, structures or characteristics, the implementation of such features, structures or characteristics in combination with other embodiments, whether explicitly described or not, should be within the knowledge of those skilled in the relevant art.

[0027] Generally, terms can be understood at least in part from their use in the context. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, at least in part depending on the context, can allow for the existence of other factors that may not be explicitly described.

[0028] Such as Figures 1-4As shown, an embodiment of the present utility model provides a preloaded tightening torque screw, which includes a bolt head 1 and a threaded column 5. A deformation elastic sheet 2 is fixedly installed at the bottom of the bolt head 1. Four stress sheets 3 are fixedly installed at the bottom of the deformation elastic sheet 2. The four stress sheets 3 are arranged at equal circumferential distances. An installation seat 4 is fixedly penetrated inside the bolt head 1. The bottom of the installation seat 4 is fixedly connected to the top of the threaded column 5. A nut 6 is threadedly connected to the outer wall of the threaded column 5. A recessed groove 7 is formed inside the nut 6. A threaded rod 8 is threadedly connected to the top of the installation seat 4. A placement groove is provided inside the installation seat 4. An extrusion ball 10 is provided at the bottom of the threaded rod 8. Three anti-slip balls 11 are provided at the bottom of the extrusion ball 10. Three spherical grooves 12 are formed on the outer wall of the installation seat 4. The three anti-slip balls 11 are respectively arranged on one side of the spherical grooves 12, and part of the anti-slip balls 11 are located inside the placement groove. An annular groove 13 is formed on the outer wall of the installation seat 4. An elastic ring 14 is provided inside the annular groove 13. The elastic ring 14 is provided at a position near the bottom on the outer wall of the anti-slip ball 11. A hexagonal groove 9 is formed at the top of the threaded rod 8. A circular chamfer is formed at the top edge of the hexagonal groove 9. The bottom of the threaded rod 8 is frustum-shaped. The three anti-slip balls 11 are of the same size. A circular chamfer is formed at the edge of the spherical groove 12. The size of the extrusion ball 10 is the same as that of the anti-slip ball 11. The elastic ring 14 is located on one side of the spherical groove 12.

[0029] Pass the threaded post 5 through the inside of the plate body from its top. At this time, the elastic ring 14 is in its initial state, and the three anti-slip balls 11 are located in the placement groove inside the threaded rod 8. The mounting seat 4 smoothly passes through the inside of the plate body. Use the nut 6 to rotate and fix it to the bottom of the threaded post 5 from one end of the threaded post 5 until the top of the nut 6 contacts the bottom of the plate body, and further rotate the nut 6. Since the deformation elastic piece 2 has a certain deformation ability, while the distance between the nut 6 and the bolt cap 1 gradually decreases, one side of the force-receiving piece 3 closely adheres to the top of the plate body, and the position of the bolt cap 1 relative to the plate body gradually moves downward, thereby causing the deformation elastic piece 2 to deform. The nut 6 is gradually tightened and stressed, so that the deformation elastic piece 2 is completely convex to reach the standard tightening torque. By setting the deformation elastic piece 2 and the force-receiving piece 3, the preloaded tightening torque can provide a more stable and controllable tightening torque for the bolt cap 1 and the threaded post 5, ensuring that the bolt cap 1 and the threaded post 5 are not easily loosened during use, having better assembly performance and reliability, reducing failures and damages caused by loosening at the bolt cap 1 during use, and extending the service life of the equipment. Then insert a hexagonal screwdriver into the top of the hexagonal groove 9. Since a chamfer is provided at the edge of the hexagonal groove 9, the screwdriver can be smoothly and accurately inserted into the inside of the hexagonal groove 9, and then drive the threaded rod 8 to rotate, so that the threaded rod 8 gradually moves downward inside the mounting seat 4. The frustum shape at the bottom of the threaded rod 8 gradually presses the extrusion ball 10. The frustum-shaped extrusion part can distribute the force more evenly on the surface of the extruded extrusion ball 10, avoiding excessive local stress and reducing the possibility of stress concentration, which is beneficial to improving the stability of the threaded rod 8 moving in the vertical direction. During the downward movement of the extrusion ball 10, it extrudes the three anti-slip balls 11 outward. A part of the anti-slip ball 11 penetrates the spherical groove 12 and contacts the elastic ring 14. The chamfer at the edge of the spherical groove 12 prevents the anti-slip ball 11 from being worn during the movement. The three anti-slip balls 11 simultaneously press the elastic ring 14, causing the elastic ring 14 to deform and providing an opposite pressure to the anti-slip ball 11. At this time, the part of the anti-slip ball 11 exposed from the spherical groove 12 is stuck on the lower surface of the plate body. Since the outer wall of the anti-slip ball 11 contacts the lower surface of the plate body and applies a certain pressure, the friction between the anti-slip ball 11 and the plate body is relatively large, making it difficult for the anti-slip ball 11 and the mounting seat 4 to rotate relative to the plate body, thereby realizing that the bolt cap 1 is not easy to rotate relative to the plate body, thus improving the firmness of the installation of the bolt cap 1, the threaded post 5 and the nut 6, and avoiding loosening and falling off during long-term use.

[0030] For the technical solution provided by the present utility model, the threaded column 5 penetrates through the inside of the plate body from the top. At this time, the elastic ring 14 is in the initial state, and the three anti-slip balls 11 are located in the placement groove inside the threaded rod 8. The mounting seat 4 smoothly passes through the inside of the plate body. The nut 6 is rotated and fixed to the bottom of the threaded column 5 from one end of the threaded column 5 until the top of the nut 6 contacts the bottom of the plate body. Further rotating the nut 6, since the deformation elastic piece 2 has a certain deformation ability, while the distance between the nut 6 and the bolt cap 1 gradually decreases, one side of the force-receiving piece 3 closely adheres to the top of the plate body, and the position of the bolt cap 1 relative to the plate body gradually moves downward, so that the deformation elastic piece 2 deforms. The nut 6 is gradually tightened and stressed, and when the deformation elastic piece 2 is completely convex, the standard tightening torque is reached. The deformation elastic piece 2 and the force-receiving piece 3 provide a preload tightening torque. Then, a hexagon socket wrench is inserted into the top of the hexagon groove 9, and then the threaded rod 8 is driven to rotate, so that the threaded rod 8 gradually moves downward inside the mounting seat 4. The conical shape at the bottom of the threaded rod 8 gradually squeezes the extrusion ball 10. During the downward movement of the extrusion ball 10, the three anti-slip balls 11 are extruded outward. A part of the anti-slip balls 11 penetrates through the spherical ball groove 12 and contacts the elastic ring 14. The three anti-slip balls 11 simultaneously squeeze the elastic ring 14, causing the elastic ring 14 to deform and providing an opposite pressure to the anti-slip balls 11. At this time, the part of the anti-slip balls 11 exposed from the spherical ball groove 12 is stuck on the lower surface of the plate body. Since the outer wall of the anti-slip balls 11 contacts the lower surface of the plate body and exerts a certain pressure, the friction between the anti-slip balls 11 and the plate body is relatively large, and the anti-slip balls 11 and the mounting seat 4 are not likely to rotate relative to the plate body.

[0031] The present utility model covers any alternatives, modifications, equivalent methods and solutions made on the essence and scope of the present utility model. In order to enable the public to have a thorough understanding of the present utility model, specific details are described in detail in the above preferred embodiments of the present utility model. However, those skilled in the art can fully understand the present utility model without the description of these details.

[0032] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A preloaded tightening torque screw, comprising a bolt cap (1) and a threaded column (5), characterized in that: A deformable spring sheet (2) is fixedly mounted on the bottom of the bolt cap (1), and four force-bearing sheets (3) are fixedly mounted on the bottom of the deformable spring sheet (2), and the four force-bearing sheets (3) are arranged at equal circumferential distances. A mounting seat (4) is fixedly penetrated inside the bolt cap (1), and the bottom of the mounting seat (4) is fixedly connected to the top of a threaded column (5). A nut (6) is threadedly connected to the outer wall of the threaded column (5), and a recessed groove (7) is provided inside the nut (6). A threaded rod (8) is threadedly connected to the top of the mounting seat (4), and the mounting seat (4) is provided with a threaded rod (8) inside. A placement groove is provided, a squeezing ball (10) is provided at the bottom of the threaded rod (8), and three anti-skid balls (11) are provided at the bottom of the squeezing ball (10). The outer wall of the mounting seat (4) is provided with three round ball grooves (12), and the three anti-skid balls (11) are respectively arranged on one side of the round ball groove (12), and part of the anti-skid balls (11) are located in the placement groove. The outer wall of the mounting seat (4) is provided with a circular groove (13), and an elastic ring (14) is arranged inside the circular groove (13). The elastic ring (14) is arranged on the outer wall of the anti-skid ball (11) near the bottom.

2. The preload tightening torque screw according to claim 1, characterized in that: A hexagonal groove (9) is formed on the top of the threaded rod (8).

3. The preload tightening torque screw according to claim 2, characterized in that: A circular chamfer is provided at the top edge of the hexagonal groove (9).

4. The preload tightening torque screw according to claim 1, characterized in that: The bottom of the threaded rod (8) is in the shape of a truncated cone.

5. The preload tightening torque screw according to claim 1, characterized in that: The three anti-slip balls (11) are of the same size.

6. The preload tightening torque screw according to claim 1, characterized in that: A circular chamfer is provided at the edge of the ball groove (12).

7. The preload tightening torque screw according to claim 1, characterized in that: The size of the squeezing ball (10) is the same as the size of the anti-slip ball (11).

8. The preload tightening torque screw according to claim 1, characterized in that: The elastic ring (14) is located on one side of the spherical groove (12).

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