Multi-stage reinforcing structure of self-tapping screw

Abstract

The utility model relates to the technical field of self-tapping screws, in particular to a multi-stage reinforcing structure of a self-tapping screw, which comprises a stud, the bottom of the stud is connected with a self-tapping conical head, the top of the stud is connected with a hexagonal screw head, and an anti-loosening mechanism is arranged in the stud. When the stud is tightened on the surface of an object and the push rod is pressed downwards, the bottom of the push rod can extrude the inclined plane sliding blocks, the anti-skid pieces connected with the inclined plane sliding blocks on the two sides are extruded out of the through grooves in an inclined plane abutting mode, the anti-skid pieces are inserted into the inner wall of a hole connected with the stud, and when the stud falls off and loosens, the anti-skid pieces rotationally retreat from the hole. However, when the stud retreats, the anti-skid piece can abut against the inner wall of the hole, and due to the fact that the upper surface of the anti-skid piece is flat and cannot form shearing force on the inner wall of the hole, on the basis of the self-locking performance of the thread teeth of the stud, the stability of the stud is further enhanced, the stud is not prone to loosening, and the reinforcing reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-tapping screws, in particular to a multi-stage reinforcement structure of a self-tapping screw. Background Art

[0002] Self-tapping screws are screws with a drill bit. They are constructed with special electric tools, and drilling, tapping, fixing and locking are completed at one time. Self-tapping screws have a certain surface hardness and mechanical strength, and have tapping and fastening functions. They are mainly used for the connection and fixing of some thinner plates, such as the connection between color steel plates, the connection between color steel plates and purlins, wall beams, etc. Their penetration ability is generally not more than 6mm, and the maximum is not more than 12mm.

[0003] The existing self-tapping screws cannot stably perform the secondary limiting work of preventing from falling off. After installation, the gap where the port contacts the outside world has a large force area, which makes it easy to loosen.

[0004] Prior art, such as publication number CN211874899U, provides an anti-slipping type limiting self-tapping screw, including a base, a guide groove, a bolt body and a connecting block, wherein the upper end of the base is fixedly connected to a docking block, and the upper end of the docking block is provided with a guide groove, the lower end surface of the base is provided with a limiting groove, and the lower end of the base is welded to a bolt body, the outer end of the bolt body is nested with a placement sheet, the outer surface of the bolt body is fixedly connected to a connecting block, and the outer end of the bolt body is bonded to a filling layer, and the inner side of the filling layer is provided with a docking groove. The anti-slipping type limiting self-tapping screw, as the bolt body is installed, its lower end surface will stably cooperate with the fixed block and the rubber material placement sheet to perform fitting and limiting work, which can effectively fit and seal the gap between the device and the installation contact surface to avoid water seepage and other adverse conditions that affect the use of the device.

[0005] In this scheme, the bonding area between the filling layer and the outer surface of the bolt body can be effectively increased by evenly distributed connecting blocks in the filling layer bonded to the outer surface of the bolt body. However, in actual use, the surface of the self-tapping screw will be squeezed with the inside of the installation object when it is tightened, so that the filling layer bonded to the outer surface will be squeezed out by the squeezing force, resulting in a decrease in the reinforcement effect; and by setting a rubber material placement sheet, as the bolt body is installed, its lower end surface will stably cooperate with the fixing block and the placement sheet to limit and fix, and then the rubber material placement sheet that fits with the lower end surface of the base can effectively fit and seal the gap between the device and the contact surface to avoid water seepage and other adverse conditions that affect the use of the device. However, in the process of tightening the bolt, the rubber material placement sheet will be firstly supported by the fixing block after contacting the installation surface. In the process of continuous tightening, the support position will be subjected to much greater force than other areas, resulting in uneven force, causing other areas that are not supported by the rubber material placement sheet to be lifted up, resulting in a decrease in sealing. In view of this, we propose a multi-stage reinforcement structure for self-tapping screws. Utility Model Content

[0006] The utility model aims to provide a multi-stage reinforcement structure for a self-tapping screw, which solves the problem that the self-tapping screw is prone to loosening due to a large stress area at the gap where the end of the screw contacts the outside world after installation.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A multi-stage reinforcement structure of a self-tapping screw, comprising a stud, a self-tapping cone head is connected to the bottom of the stud, a hexagonal screw head is connected to the top of the stud, and an anti-loosening mechanism is arranged inside the stud;

[0009] The anti-loosening mechanism includes a circular groove, which is arranged on the top of the hexagonal screw head, a rectangular slide groove is arranged at the bottom of the circular groove, and the rectangular slide groove extends to the inside of the stud, and inclined sliders are slidably connected to both sides of the bottom of the inner wall of the rectangular slide groove, and an anti-slip sheet is connected to one side of the inclined slider, and through grooves are respectively arranged on both sides of the stud, and the anti-slip sheet extends to the outside of the stud through the through grooves, and a push rod is slidably connected to the inner wall of the rectangular slide groove, and the inclined surfaces on both sides of the bottom of the push rod are respectively in contact with the inclined surfaces of the corresponding inclined sliders, and by providing a rectangular slide groove on the inner wall of the stud, when the stud is already After the surface of the object is tightened, when the push rod is pressed down, the bottom of the push rod will squeeze the inclined slider, and the anti-skid sheet connected to the inclined sliders on both sides will be squeezed out from the through groove by the inclined abutment, so that the anti-skid sheet is inserted into the inner wall of the hole connected to the stud. When the stud falls off and loosens, it rotates out of the hole, but when the stud retreats, the anti-skid sheet will resist the inner wall of the hole. Since the upper surface of the anti-skid sheet is flat, it cannot form a shear force on the inner wall of the hole. On the basis of the self-locking property of the stud's own thread teeth, the stability of the stud is further enhanced, making it less likely to loosen, thereby improving the reliability of reinforcement.

[0010] Preferably, the anti-slip sheet is provided with a sharp angle at one end outside the stud, and the anti-slip sheet is provided with flat surfaces on both sides. By providing the insertion end of the anti-slip sheet with a sharp angle, the resistance during insertion can be reduced, and the flat surfaces on both sides of the anti-slip sheet make it difficult for the anti-slip sheet to undergo circumferential displacement, thereby improving stability.

[0011] Preferably, the inner wall of the push rod is threadedly connected to a threaded rod, and the top of the threaded rod is connected to a round screw head. Through the rotation of the threaded rod, the push rod is pressed downward on the basis of relative limitation of the connection relationship between the push rod and the rectangular slide groove.

[0012] Preferably, the circular screw head is located inside the circular groove, and a second cross groove is provided on the top of the circular screw head, and the second cross groove is used for inserting a cross tool into the circular screw head to drive the circular screw head.

[0013] Preferably, the outer wall sliding sleeve of the hexagonal screw head is provided with a hexagonal cap, and a first cross slot is opened on the top of the hexagonal cap. By providing the hexagonal cap, the hexagonal screw head can be protected to avoid corrosion, and the hexagonal cap and the first cross slot on its top can be used as tool disassembly self-tapping screw force points.

[0014] Preferably, a washer is provided on the outer wall of the stud below the hexagonal screw head. The washer can be used to seal the connection between the stud and the hole, and the rubber washer can increase friction and prevent slipping.

[0015] Preferably, an extrusion ring is connected to the position of the washer at the bottom of the hexagonal screw head, and a sealing ring is connected to the bottom of the washer. The washer is further tightened by arranging the extrusion ring and the sealing ring, and the staggered tightened annular areas can further increase the sealing of the overall structure, making it difficult for liquid to enter the position where the stud is connected to the hole to cause corrosion.

[0016] By means of the above technical solution, the utility model provides a multi-level reinforcement structure of self-tapping screws. It has at least the following beneficial effects:

[0017] First, the utility model provides a rectangular sliding groove on the inner wall of the stud. After the stud has been tightened on the surface of the object, when the push rod is pressed down, the bottom of the push rod will squeeze the inclined slider, and the anti-skid sheet connected to the inclined sliders on both sides will be squeezed out of the through groove by the inclined abutment, so that the anti-skid sheet is inserted into the inner wall of the hole connected to the stud. When the stud falls off and loosens, it rotates out of the hole. However, when the stud retreats, the anti-skid sheet will abut the inner wall of the hole. Since the upper surface of the anti-skid sheet is flat, it cannot form a shear force on the inner wall of the hole. On the basis of the self-locking property of the thread teeth of the stud, the stability of the stud is further enhanced, making it less likely to loosen, thereby improving the reliability of reinforcement.

[0018] 2. The utility model can firstly protect the hexagonal screw head by arranging the hexagonal cap to avoid corrosion, and the hexagonal cap and the first cross groove on the top thereof can be used as the force points of the self-tapping screws for tool disassembly, and the gasket is further tightened by arranging the extrusion ring and the sealing ring, and the staggered and tightened annular areas can further increase the sealing of the overall structure, making it difficult for liquid to enter the connection position between the stud and the hole to cause corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a partial cross-sectional view of the utility model;

[0022] Figure 3 For this utility model Figure 2 A magnified view of middle;

[0023] Figure 4 For this utility model Figure 2 Enlarged view of B.

[0024] In the figure: 1, stud; 11, self-tapping cone head; 12, hexagonal screw head; 2, hexagonal cap; 21, first cross groove; 3, washer; 31, extrusion ring; 32, sealing ring; 4, anti-loosening mechanism; 41, rectangular slide groove; 42, push rod; 421, inclined slider; 422, through groove; 423, anti-slip sheet; 43, round groove; 44, threaded rod; 45, round screw head; 451, second cross groove. DETAILED DESCRIPTION

[0025] 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.

[0026] Example 1

[0027] A multi-stage reinforcement structure of a self-tapping screw, such as Figure 1 , Figure 3 , Figure 4As shown, it includes a stud 1, a self-tapping cone head 11 is connected to the bottom of the stud 1, a hexagonal screw head 12 is connected to the top of the stud 1, an anti-loosening mechanism 4 is arranged inside the stud 1, and the anti-loosening mechanism 4 includes a circular groove 43, the circular groove 43 is opened on the top of the hexagonal screw head 12, a rectangular slide 41 is opened at the bottom of the circular groove 43, and the rectangular slide 41 extends to the inside of the stud 1, and the two sides of the bottom of the inner wall of the rectangular slide 41 are slidably connected with an inclined slider 421, and one side of the inclined slider 421 is connected to an anti-slip sheet 423, and the two sides of the stud 1 are respectively provided with through grooves 422, and the anti-slip sheet 42 The push rod 42 is slidably connected to the inner wall of the rectangular slot 41, and the inclined surfaces on both sides of the bottom of the push rod 42 are respectively in contact with the inclined surfaces of the corresponding inclined sliding blocks 421. By providing the rectangular slot 41 on the inner wall of the stud 1, when the stud 1 has been tightened on the surface of the object, when the push rod 42 is pressed down, the bottom of the push rod 42 will squeeze the inclined sliding blocks 421, and the anti-slip sheet 423 connected to the inclined sliding blocks 421 on both sides will be squeezed out of the slot 422 by the inclined surface abutment, so that the anti-slip sheet 423 is inserted into the inner wall of the hole connected to the stud 1, and the stud 1 is screwed on the surface of the object. When the stud 1 falls off and becomes loose, it rotates out of the hole. However, when the stud 1 retreats, the anti-skid sheet 423 will press against the inner wall of the hole. Since the upper surface of the anti-skid sheet 423 is flat, it cannot form a shear force on the inner wall of the hole. On the basis of the self-locking property of the thread teeth of the stud 1, the stability of the stud 1 is further reinforced, making it less likely to loosen, thereby improving the reliability of the reinforcement. The anti-skid sheet 423 is arranged at a sharp angle at one end outside the stud 1, and the two sides of the anti-skid sheet 423 are arranged in planes. By setting the insertion end of the anti-skid sheet 423 to a sharp angle, the insertion time can be reduced. The anti-slip sheet 423 has a plurality of flat surfaces on its sides, which make it difficult for the anti-slip sheet 423 to be displaced circumferentially, thereby improving stability. The inner wall of the push rod 42 is threadedly connected with a threaded rod 44, and the top of the threaded rod 44 is connected with a round screw head 45. Through the rotation of the threaded rod 44, the push rod 42 is pressed down on the basis of relative limitation of the connection relationship between the push rod 42 and the rectangular slide groove 41. The round screw head 45 is located inside the round groove 43, and a second cross groove 451 is provided on the top of the round screw head 45. The second cross groove 451 is used for the tool cross to be inserted and drive the round screw head 45.

[0028] The screw thread 44 is pressed against the screw thread 42 and the screw thread 42 is pressed against the screw thread 42.

[0029] Example 2

[0030] like Figure 2 , Figure 3 As shown, the outer wall sliding sleeve of the hexagonal screw head 12 is provided with a hexagonal cover cap 2, and the top of the hexagonal cover cap 2 is provided with a first cross groove 21. By providing the hexagonal cover cap 2, the hexagonal screw head 12 can be protected to prevent it from being corroded, and the hexagonal cover cap 2 and the first cross groove 21 on its top can be used as tools to disassemble the self-tapping screw force point. The outer wall of the stud 1 is located below the hexagonal screw head 12 and is movablely sleeved with a gasket 3. By providing the gasket 3, the position where the stud 1 is connected to the hole can be sealed, and the rubber gasket 3 can increase the friction and prevent slipping. The bottom of the hexagonal screw head 12 is connected with an extrusion ring 31 corresponding to the position of the gasket 3, and the bottom of the gasket 3 is connected with a sealing ring 32. By providing the extrusion ring 31 and the sealing ring 32, the gasket 3 is further tightened, and the staggered tightened annular areas can further increase the sealing of the overall structure, making it difficult for liquid to enter the position where the stud 1 is connected to the hole to cause corrosion.

[0031] In this embodiment, by providing the hexagonal cap 2, the hexagonal screw head 12 can be protected to prevent it from being corroded, and the hexagonal cap 2 and the first cross groove 21 on its top can be used as a tool to disassemble the self-tapping screw force point, and by providing the washer 3, the position where the stud 1 is connected to the hole can be sealed, and the rubber washer 3 can increase the friction and prevent slipping. By providing the extrusion ring 31 and the sealing ring 32, the washer 3 is further tightened, and the staggered tightened annular areas can further increase the sealing of the overall structure, making it difficult for liquid to enter the position where the stud 1 is connected to the hole to cause corrosion.

[0032] The multi-stage reinforcement structure of the self-tapping screw of the utility model is used. When the stud 1 has been tightened on the surface of an object, a cross is inserted into the second cross groove 451 to screw the circular screw head 45 to drive the rotation of the threaded rod 44. Through the rotation of the threaded rod 44, the push rod 42 is pressed down on the basis of the relative limit between the connection relationship between the push rod 42 and the rectangular slide groove 41. When the push rod 42 is pressed down, the bottom of the push rod 42 will squeeze the inclined slider 421, and the anti-skid sheet 423 connected to the inclined sliders 421 on both sides will be squeezed out from the through groove 422 by the way of inclined abutment, so that the anti-skid sheet 423 is inserted into the inner wall of the hole connected to the stud 1, and the stud is When the stud 1 falls off and becomes loose, it rotates to exit the hole. However, when the stud 1 retreats, the anti-skid sheet 423 will press against the inner wall of the hole. Since the upper surface of the anti-skid sheet 423 is flat, it cannot form a shear force on the inner wall of the hole. Therefore, on the basis of the self-locking property of the thread of the stud 1 itself, the stability of the stud 1 is further reinforced, so that it is not easy to loosen, and the reliability of the reinforcement is improved. By arranging the extrusion ring 31 and the sealing ring 32, the gasket 3 is further tightened, and the staggered tightened annular areas can further increase the sealing of the overall structure, making it difficult for liquid to enter the connection position between the stud 1 and the hole to cause corrosion.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage reinforcement structure of a self-tapping screw, comprising a stud (1), characterized in that: The bottom of the stud (1) is connected to a self-tapping cone head (11), the top of the stud (1) is connected to a hexagonal screw head (12), and an anti-loosening mechanism (4) is arranged inside the stud (1); The anti-loosening mechanism (4) comprises a circular groove (43), wherein the circular groove (43) is provided at the top of the hexagonal screw head (12), a rectangular slide groove (41) is provided at the bottom of the circular groove (43), and the rectangular slide groove (41) extends to the inside of the stud (1), and the two sides of the bottom of the inner wall of the rectangular slide groove (41) are slidably connected with inclined sliding blocks (421), and one side of the inclined sliding block (421) is connected with an anti-slip sheet (423), and the two sides of the stud (1) are respectively provided with through grooves (422), and the anti-slip sheet (423) extends to the outside of the stud (1) through the through grooves (422), and the inner wall of the rectangular slide groove (41) is slidably connected with a push rod (42), and the inclined surfaces on both sides of the bottom of the push rod (42) are respectively in contact with the inclined surfaces of the corresponding inclined sliding blocks (421).

2. A multi-stage reinforcement structure of a self-tapping screw according to claim 1, characterized in that: The anti-slip sheet (423) is arranged at one end outside the stud (1) in a pointed angle, and both sides of the anti-slip sheet (423) are arranged in flat surfaces.

3. The multi-stage reinforcement structure of a self-tapping screw according to claim 1, characterized in that: The inner wall of the push rod (42) is threadedly connected to a threaded rod (44), and the top of the threaded rod (44) is connected to a round screw head (45).

4. The multi-stage reinforcement structure of a self-tapping screw according to claim 3, characterized in that: The circular screw head (45) is located inside the circular groove (43), and a second cross groove (451) is formed on the top of the circular screw head (45).

5. The multi-stage reinforcement structure of a self-tapping screw according to claim 1, characterized in that: The outer wall sliding sleeve of the hexagonal screw head (12) is provided with a hexagonal cover cap (2), and the top of the hexagonal cover cap (2) is provided with a first cross groove (21).

6. The multi-stage reinforcement structure of a self-tapping screw according to claim 1, characterized in that: The outer wall of the stud (1) is movably sleeved with a washer (3) at a position below the hexagonal screw head (12).

7. A multi-stage reinforcement structure of a self-tapping screw according to claim 6, characterized in that: The bottom of the hexagonal screw head (12) is connected to a position corresponding to the washer (3) with an extrusion ring (31), and the bottom of the washer (3) is connected to a sealing ring (32).

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