A high-strength screw

Abstract

The utility model discloses a high strength screw, including screw head and with the screw head integrated moulding screw rod, the movable installation of screw rod has nut, is equipped with the installation groove on the nut, is equipped with the plug -in stick in the installation groove, the top of plug -in stick is equipped with antiskid pad, and the surface of antiskid pad is equipped with the anti -slip grain, be equipped with the limit structure on the lateral wall of nut, the transition of screw head and screw rod is provided with arc transition section. Screw head and screw rod adopt integrated moulding technology in the utility model, and the arc transition section of transition can effectively disperse stress, can bear greater load, through the limit structure, can be effectively limit fixed after the nut is tightened, prevents the nut from loosening because of vibration and other factors, guarantees the long -term reliability of connection.

Description

Technical Field

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

[0002] Screws, as a common fastener, are widely used in various industries, and their main function is to fix two or more parts together. With the rapid development of modern industry, various equipment and structures have increasingly higher requirements for the performance of screws, especially in some applications that need to withstand large tensile forces, shear forces, impact forces, and long-term vibrations, where more stringent standards are imposed on the strength of screws. Currently, most common screws on the market are made of ordinary steel, and their strength is improved through conventional heat treatment processes. The transition between the head and the shank of these screws is usually a simple rounded or right-angled transition. During the stress process, stress concentration is prone to occur at this part. Stress concentration will significantly reduce the actual load-bearing capacity of the screw, causing the screw to fail at a level far below its material ultimate strength. Furthermore, in the nut connection, the internal thread connection of the nut may wear due to excessive force or other reasons, causing the thread to fail to mesh, resulting in a situation where the threaded connection cannot be tightened, which is called stripping. When the nut has stripped threads, it will make mechanical disassembly inconvenient and affect mechanical maintenance. Utility Model Content

[0003] The main objective of this invention is to provide a high-strength screw to solve the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-strength screw, comprising a screw head and a screw rod integrally formed with the screw head, a nut movably mounted on the screw rod, the nut having an installation groove, an insert rod having an anti-slip pad on the top of the insert rod, and an anti-slip texture on the surface of the anti-slip pad; a limiting structure being provided on the side wall of the nut; and an arc-shaped transition section being provided at the transition between the screw head and the screw rod.

[0005] Based on the above scheme and as a preferred embodiment of the above scheme: the limiting structure includes a cavity set in the inner wall of the nut and a pull block on the outer wall of the nut, a rod is provided on one side of the pull block, a limiting block is provided at the end of the rod, and a return spring is provided on the outer periphery of the rod; a limiting groove is provided on the screw, and the dimensions of the limiting block and the limiting groove are adapted to each other.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: a sealing washer is provided at the connection position between the anti-slip pad and the nut, and the inner diameter of the sealing washer is equal to the inner diameter of the internal thread of the nut.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the radius of the arc transition section is 1.5-3mm.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: a nitriding layer and an epoxy resin anti-corrosion coating are sequentially provided on the outer surfaces of the screw head and the screw rod.

[0009] The beneficial effects of this utility model are as follows: In this utility model, the screw head and the screw rod are integrally formed, and the arc transition section at the transition point can effectively disperse stress and withstand greater loads; through the limiting structure, the nut can be effectively limited and fixed after being tightened, preventing the nut from loosening due to vibration and other factors, and ensuring the long-term reliability of the connection. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the present invention; Figure 3 This is a schematic diagram of the limiting structure in this utility model. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.

[0012] See attached diagram. Figures 1 to 3 In this embodiment, a high-strength screw is provided, comprising a screw head and a screw rod 3 integrally formed with the screw head. A nut 1 is movably mounted on the screw rod 3. The nut 1 is provided with a mounting groove 10. An insert rod 20 is provided in the mounting groove 10. An anti-slip pad 2 is provided on the top of the insert rod 20. The surface of the anti-slip pad 2 is provided with anti-slip texture. A limiting structure is provided on the side wall of the nut 1. An arc-shaped transition section 7 is provided at the transition between the screw head and the screw rod 3.

[0013] Furthermore, the limiting structure includes a cavity 11 set in the inner wall of the nut 1 and a pull block 4 on the outer wall of the nut 1. A rod 5 is provided on one side of the pull block 4, a limiting block 6 is provided at the end of the rod 5, and a return spring 50 is provided on the outer periphery of the rod 5. A limiting groove 30 is provided on the screw 3, and the dimensions of the limiting block 6 and the limiting groove 30 are adapted to each other.

[0014] Furthermore, a sealing washer is provided at the connection position between the anti-slip pad 2 and the nut 1, and the inner diameter of the sealing washer is equal to the inner diameter of the internal thread of the nut 1.

[0015] Furthermore, the radius of the arc-shaped transition section 7 is 1.5-3 mm. Furthermore, a nitriding layer and an epoxy resin anti-corrosion coating are sequentially provided on the outer surfaces of the screw head and the screw rod 3.

[0016] In this embodiment, the screw head and screw 3 are integrally formed, and the arc transition section 7 (radius 1.5-3mm) at the transition point can effectively disperse stress, avoid stress concentration, significantly improve the overall structural strength of the screw, withstand greater loads, and reduce the risk of breakage.

[0017] The limiting structure can effectively limit and fix the nut 1 after it is tightened, preventing the nut 1 from loosening due to vibration and other factors, and ensuring the long-term reliability of the connection. Specifically, when using nut 1, an anti-slip pad is installed through the mounting groove 10 and the insert rod 20. The anti-slip pad 2 enhances the friction after the nut is installed, thus preventing slippage. At the same time, before screwing in the screw rod 3, pull up the pull block 4. The pull block 4 drives the rod body 5 and the limiting block 6 to move upward. The limiting block 6 can slide on the inner wall of the cavity 11, and the return spring 50 is compressed. At this time, the operator can connect the screw rod 3 and nut 1 with threads. When the limiting block 6 aligns with the limiting groove 30, the operator can release the pull block 4. Under the elastic return action of the return spring 50, the limiting block 6 can be driven to insert into the limiting groove 30, thereby achieving a limiting effect. More specifically, the insertion rod 20 and the mounting groove 10 are fastened by an interference fit. The top of the insertion rod 20 is fixed to the anti-slip pad 2 by adhesive bonding or a slot structure. With the elastic compression of the sealing gasket, the anti-slip pad can be effectively prevented from loosening or falling off. In one possible implementation, the position of the limiting groove 30 on the screw 3 is preset according to the position of the limiting block 6 after the nut 1 is tightened, and the end of the limiting block 6 is provided with a guide slope, so that the position can be aligned by slightly adjusting the angle of the screw 3 during the screwing process.

[0018] Preferably, the nitrided layer and the epoxy resin anti-corrosion coating sequentially disposed on the outer surface of the screw head and the screw 3 not only improve the hardness and wear resistance of the screw surface and reduce wear during use, but also isolate external corrosive media, significantly improve the corrosion resistance of the screw, and enable it to work stably for a long time in complex and harsh environments.

[0019] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A high-strength screw characterized by: The screw includes a screw head and a screw rod (3) integrally formed with the screw head. A nut (1) is movably mounted on the screw rod (3). The nut (1) is provided with a mounting groove (10). A plug rod (20) is provided in the mounting groove (10). An anti-slip pad (2) is provided on the top of the plug rod (20). The surface of the anti-slip pad (2) is provided with anti-slip texture. A limiting structure is provided on the side wall of the nut (1). An arc-shaped transition section (7) is provided at the transition between the screw head and the screw rod (3).

2. A high strength screw as defined in claim 1, wherein: The limiting structure includes a cavity (11) set in the inner wall of the nut (1) and a pull block (4) on the outer wall of the nut (1). A rod (5) is provided on one side of the pull block (4), and a limiting block (6) is provided at the end of the rod (5). A return spring (50) is provided on the outer periphery of the rod (5). A limiting groove (30) is provided on the screw (3), and the dimensions of the limiting block (6) and the limiting groove (30) are adapted to each other.

3. A high strength screw as defined in claim 2, wherein: A sealing washer is provided at the connection position between the anti-slip pad (2) and the nut (1), and the inner diameter of the sealing washer is equal to the inner diameter of the internal thread of the nut (1).

4. A high strength screw as defined in claim 3, wherein: The radius of the arc-shaped transition section (7) is 1.5-3mm.

5. A high strength screw as defined in claim 4, wherein: The screw head and the outer surface of the screw (3) are sequentially provided with a nitriding layer and an epoxy resin anti-corrosion coating.

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