A high-strength corrosion-resistant stainless steel fastener

Abstract

The utility model provides a high strength corrosion -resistant stainless steel fastener belongs to fastener technical field technical field, including main screw rod, the hard tube is embedded in main screw rod middle part, the hexagonal main nut is fixedly connected with the top of main screw rod, is equipped with the main thread hole in the middle part of hard tube, has the vice screw rod to be connected with screw in main thread hole, the plastic expansion cylinder is equipped with in the flat head bottom of vice screw rod, is equipped with the split mouth in the top four corners of plastic expansion cylinder, is equipped with semicircle extruding head in the bottom of vice screw rod, is equipped with a plurality of recesses in the lateral wall of plastic expansion cylinder, is equipped with a plurality of anti -skid convexo -concave of distributing in the middle part of plastic expansion cylinder outer wall, is equipped with the connecting hole in the bottom of plastic expansion cylinder, the bottom end of vice screw rod is connected in the connecting hole, the utility model provides a high strength corrosion -resistant stainless steel fastener, installs into the sealed hole through PVE sealing cap, seals the place of hexagonal boss and main thread hole, avoids the rainwater to produce the corrosion in main thread hole.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, specifically relating to a high-strength corrosion-resistant stainless steel fastener. Background Technology

[0002] Existing screws have poor corrosion resistance, which reduces their service life. Long-term rust can also cause screws to become weak. The "self-tapping screw" disclosed in application number "CN202223070808.6" is an increasingly mature technology. By setting acrylic enamel, precipitation-hardened stainless steel layer, alloy tool steel layer and polytetrafluoroethylene coating, it solves the problems of poor corrosion resistance, reduced service life and long-term rust causing screws to become weak. However, this device still has the following defects: during use, the fixing connection of the fastener is prone to rust, which can cause the fastener to loosen and fall off, affecting the connection of the fastener. Utility Model Content

[0003] The purpose of this invention is to provide a high-strength, corrosion-resistant stainless steel fastener, which aims to solve the problem that fasteners in the prior art are prone to rust at the fixing connection, leading to loosening and falling off, and affecting the connection of the fasteners.

[0004] To achieve the above objectives, this utility model provides the following technical solution: It includes a main screw, a rigid tube embedded in the middle of the main screw, a hexagonal main nut fixedly connected to the top of the main screw, a main threaded hole in the middle of the rigid tube, an auxiliary screw internally threaded into the main threaded hole, a plastic expansion cylinder fitted onto the flat bottom of the auxiliary screw, a flat extrusion end at the end of the main screw, split openings at the four corners of the top of the plastic expansion cylinder, a semi-circular extrusion head at the bottom of the auxiliary screw, several grooves on the side wall of the plastic expansion cylinder, several anti-slip protrusions distributed in the middle of the outer wall of the plastic expansion cylinder, a connecting hole at the bottom of the plastic expansion cylinder, and the bottom end of the auxiliary screw inserted into the connecting hole.

[0005] In one embodiment of the high-strength corrosion-resistant stainless steel fastener of this utility model, the plastic expansion cylinder is integrally injection molded from polytetrafluoroethylene material.

[0006] In this solution, the auxiliary screw is pre-installed into the main threaded hole. After the main screw is installed in the external hole, the hexagonal convex head is rotated to pull the auxiliary screw upward. At this time, the semi-circular extrusion head presses the bottom of the plastic expansion cylinder, and the plastic expansion cylinder expands, so that the plastic expansion cylinder is stuck in the external hole to form an expansion screw structure.

[0007] In one embodiment of the high-strength corrosion-resistant stainless steel fastener of this utility model, the top of the auxiliary screw is provided with a hexagonal protrusion, the middle of the hexagonal main nut is provided with a sealing hole, the sealing hole is internally threaded with a PVE sealing cap, and the top side of the PVE sealing cap is provided with a sealing rubber ring.

[0008] In this solution, after the main screw is installed into the external hole, a hex screwdriver is used to wedge into the inner wall of the hexagonal protrusion, causing the auxiliary screw to be screwed upwards and tightened. Then, the PVE sealing cap is installed into the sealing hole to seal the hexagonal protrusion and the main threaded hole, preventing rainwater from entering the main threaded hole and causing corrosion, thus improving the overall strength.

[0009] In one embodiment of the high-strength corrosion-resistant stainless steel fastener of this utility model, the bottom side of the hexagonal main nut is integrally provided with a platform-shaped seat, and the bottom of the platform-shaped seat is provided with an anti-slip pad.

[0010] In this design, after the main screw is installed, the platform seat abuts against the anti-slip pad. The anti-slip pad increases the friction between the platform seat and the external connection, preventing the main screw from stripping after installation.

[0011] In one embodiment of the high-strength corrosion-resistant stainless steel fastener of this utility model, the bottom of the anti-slip pad is engraved with a diamond-shaped anti-slip texture.

[0012] In this design, the diamond-shaped anti-slip texture on the surface of the anti-slip pad increases the friction with the contact surface, making the connection between the main screw and the external hole tighter.

[0013] In one embodiment of the high-strength corrosion-resistant stainless steel fastener of this utility model, the main screw, the auxiliary screw, the hexagonal main nut, and the surface are all made of galvanized stainless steel.

[0014] In this design, the main screw, auxiliary screw, and hexagonal main nut are made of galvanized stainless steel, which improves corrosion resistance and overall strength, and reduces the degree of corrosion of the main screw, auxiliary screw, and hexagonal main nut.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) By pre-installing the auxiliary screw into the main threaded hole, and then installing the main screw into the external hole, the platform seat abuts against the anti-slip pad. The anti-slip pad increases the friction between the platform seat and the external connection, preventing the main screw from stripping after installation. At this time, a hex screwdriver is used to wedge into the inner wall of the hexagonal protrusion, so that the auxiliary screw is screwed upwards and tightened. As the semi-circular extrusion head presses the plastic expansion cylinder upwards, the top split of the plastic expansion cylinder is squeezed open by the flat-head extrusion end, forming the first expansion fixing structure at the top of the plastic expansion cylinder. As the flat-head extrusion end continues to press, the plastic expansion cylinder continues to contract and expand, the groove twists and opens, and the anti-slip protrusion abuts against the side wall of the external hole to form the second expansion fixing structure, improving the tightness between the main screw and the inner wall of the external hole after installation.

[0017] 2) By installing the PVE sealing cap into the sealing hole, the hexagonal protrusion and the main threaded hole are sealed, preventing rainwater from entering the main threaded hole and causing corrosion, thus improving the overall strength. During use, the screw, auxiliary screw, and hexagonal main nut are made of galvanized stainless steel, which improves corrosion resistance and overall strength, and reduces the degree of corrosion of the main screw, auxiliary screw, and hexagonal main nut. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the main screw of this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the plastic expansion cylinder of this utility model.

[0022] In the diagram: 1. Main screw; 2. Rigid tube; 3. Hexagonal main nut; 4. Main threaded hole; 5. Secondary screw; 6. Plastic expansion cylinder; 7. Flat-head extrusion end; 8. Split end; 9. Semi-circular extrusion head;

[0023] 10. Groove; 11. Anti-slip protrusion; 12. Connecting hole; 13. Hexagonal protrusion; 14. Sealing hole; 15. PVE sealing cap; 16. Sealing ring; 17. Platform base; 18. Anti-slip pad. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1-3 This utility model provides the following technical solution: a high-strength corrosion-resistant stainless steel fastener, including a main screw 1, a rigid tube 2 embedded in the middle of the main screw 1, a hexagonal main nut 3 fixedly connected to the top of the main screw 1, a main threaded hole 4 opened in the middle of the rigid tube 2, an auxiliary screw 5 internally threaded into the main threaded hole 4, a plastic expansion cylinder 6 fitted onto the flat bottom of the auxiliary screw 5, a flat extrusion end 7 at the end of the main screw 1, split openings 8 at the four corners of the top of the plastic expansion cylinder 6, a semi-circular extrusion head 9 at the bottom of the auxiliary screw 5, several grooves 10 on the side wall of the plastic expansion cylinder 6, several anti-slip protrusions 11 distributed in the middle of the outer wall of the plastic expansion cylinder 6, a connecting hole 12 at the bottom of the plastic expansion cylinder 6, and the bottom end of the auxiliary screw 5 inserted into the connecting hole 12.

[0026] In a specific embodiment of a high-strength, corrosion-resistant stainless steel fastener, please refer to... Figure 1 The plastic expansion cylinder 6 is made of polytetrafluoroethylene material and is integrally injection molded.

[0027] Please see Figure 1 : Install the auxiliary screw 5 into the main threaded hole 4 in advance. After the main screw 1 is installed in the external hole, rotate the hexagonal convex head 13 to pull the auxiliary screw 5 upward. At this time, the semi-circular extrusion head 9 extrudes the bottom of the plastic expansion cylinder 6, and the plastic expansion cylinder 6 expands, so that the plastic expansion cylinder 6 is stuck in the external hole to form an expansion screw structure.

[0028] In a specific embodiment of a high-strength, corrosion-resistant stainless steel fastener, please refer to... Figure 2-3 The auxiliary screw 5 has a hexagonal protrusion 13 at the top and a sealing hole 14 in the middle of the hexagonal main nut 3. The sealing hole 14 is internally threaded with a PVE sealing cap 15 and a sealing rubber ring 16 is provided on the top side of the PVE sealing cap 15.

[0029] Please see Figure 2-3 After the main screw 1 is installed into the external hole, use a hex screwdriver to wedge into the inner wall of the hexagonal protrusion 13, so that the auxiliary screw 5 is screwed upwards and tightened. Then, install the PVE sealing cap 15 into the sealing hole 14 to seal the hexagonal protrusion 13 and the main threaded hole 4, so as to prevent rainwater from entering the main threaded hole 4 and causing rust, and improve the overall strength.

[0030] In a specific embodiment of a high-strength, corrosion-resistant stainless steel fastener, please refer to... Figure 1 The hexagonal main nut 3 has an integral platform seat 17 on the bottom side, and the platform seat 17 has an anti-slip pad 18 on the bottom.

[0031] Please see Figure 1 After the main screw 1 is installed, the platform seat 17 abuts against the anti-slip pad 18. The anti-slip pad 18 increases the friction between the platform seat 17 and the external connection, preventing the main screw 1 from stripping after installation.

[0032] In a specific embodiment of a high-strength, corrosion-resistant stainless steel fastener, please refer to... Figure 1 The bottom of the anti-slip pad 18 is engraved with a diamond-shaped anti-slip texture.

[0033] Please see Figure 1 The diamond-shaped anti-slip texture on the surface of the anti-slip pad 18 increases the friction with the contact surface, making the connection between the main screw 1 and the external hole tighter.

[0034] In a specific embodiment of a high-strength, corrosion-resistant stainless steel fastener, please refer to... Figure 1 Main screw 1, auxiliary screw 5, and hexagonal main nut 3 are all made of galvanized stainless steel.

[0035] Please see Figure 1 The main screw 1, auxiliary screw 5, and hexagonal main nut 3 are made of galvanized stainless steel, which improves corrosion resistance and overall strength, and reduces the degree of rust on the main screw 1, auxiliary screw 5, and hexagonal main nut 3.

[0036] This utility model provides a high-strength, corrosion-resistant stainless steel fastener. The specific usage is as follows: The auxiliary screw 5 is pre-installed into the main threaded hole 4. After the main screw 1 is installed into the external hole, the platform seat 17 abuts against the anti-slip pad 18. The anti-slip pad 18 increases the friction between the platform seat 17 and the external connection, preventing stripping of the main screw 1 after installation. At this time, a hex screwdriver is used to wedge into the inner wall of the hexagonal protrusion 13, causing the auxiliary screw 5 to be screwed upwards. As the semi-circular extrusion head 9 extrudes the plastic expansion cylinder 6 upwards, the top split 8 of the plastic expansion cylinder 6 is extruded and cracked by the flat-head extrusion end 7, forming a first expansion and fixing structure at the top of the plastic expansion cylinder 6. As the flat-head extrusion end 7 continues to extrude, the plastic… The expansion cylinder 6 continues to contract and expand, the groove 10 twists and opens, and the anti-slip protrusion 11 abuts against the side wall of the external hole to form a second expansion fixing structure. Since the main screw 1 and the auxiliary screw 5 rotate in opposite directions, two opposite thread fixing structures are formed, which improves the tightness between the main screw 1 and the inner wall of the external hole after installation. The PVE sealing cap 15 is installed into the sealing hole 14 to seal the hexagonal protrusion 13 and the main thread hole 4, preventing rainwater from entering the main thread hole 4 and causing corrosion, thus improving the overall strength. During use, the main screw 1, auxiliary screw 5, and hexagonal main nut 3 are made of galvanized stainless steel, which improves corrosion resistance and overall strength, and reduces the degree of corrosion of the main screw 1, auxiliary screw 5, and hexagonal main nut 3.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-strength, corrosion-resistant stainless steel fastener, comprising a main screw (1), characterized in that: The main screw (1) is fitted with a rigid tube (2) in the middle. A hexagonal main nut (3) is fixedly connected to the top of the main screw (1). A main thread hole (4) is opened in the middle of the rigid tube (2). A secondary screw (5) is internally threaded in the main thread hole (4). A plastic expansion cylinder (6) is fitted on the flat bottom of the secondary screw (5). A flat extrusion end (7) is provided at the end of the main screw (1). Split openings (8) are opened at the four corners of the top of the plastic expansion cylinder (6). A semi-circular extrusion head (9) is provided at the bottom of the secondary screw (5). Several grooves (10) are opened on the side wall of the plastic expansion cylinder (6). Several anti-slip protrusions (11) are distributed in the middle of the outer wall of the plastic expansion cylinder (6). A connection hole (12) is opened at the bottom of the plastic expansion cylinder (6). The bottom end of the secondary screw (5) is inserted into the connection hole (12).

2. The stainless steel fastener according to claim 1, characterized in that: The plastic expansion cylinder (6) is made of polytetrafluoroethylene material through a one-piece injection molding process.

3. The stainless steel fastener according to claim 1, characterized in that: The auxiliary screw (5) has a hexagonal protrusion (13) at the top and a sealing hole (14) in the middle of the hexagonal main nut (3). The sealing hole (14) is internally threaded with a PVE sealing cap (15) and a sealing rubber ring (16) is provided on the top side of the PVE sealing cap (15).

4. The stainless steel fastener according to claim 1, characterized in that: The hexagonal main nut (3) has an integral platform seat (17) on the bottom side, and the platform seat (17) has an anti-slip pad (18) on the bottom.

5. The stainless steel fastener according to claim 4, characterized in that: The bottom of the anti-slip pad (18) is engraved with a diamond-shaped anti-slip texture.

6. The stainless steel fastener according to claim 1, characterized in that: The main screw (1), the auxiliary screw (5), and the hexagonal main nut (3) are all made of galvanized stainless steel.

Images