Self-drilling and self-reaming screw and using method thereof

Abstract

The invention discloses a self-drilling and reaming screw and a using method thereof. The screw comprises a connecting part, the surface of the connecting part is provided with a thread, and a reaming cutter is fixed to the top of the thread; the fastening part is integrally fixed at the top end of the connecting part; an inner hole extending downwards is formed in the top end of the connecting part, the top of the inner hole is communicated with the fastening part, a lubricating assembly is placed in the inner hole, the lubricating assembly is composed of a sealing piece and an oil storage piece, and the oil storage piece is inserted into the inner hole; by means of the design, the reaming screw is filled with lubricating oil, the self-lubricating function is achieved according to needs after the reaming screw is filled with the lubricating oil, when the reaming screw is not used, the internal lubricating oil is in a blocked state and cannot leak outwards, the self-lubricating function is not affected in normal installation, later disassembly and assembly can be facilitated by injecting the lubricating oil into the screw, and the service life of the reaming screw is prolonged. And the technical blank of the lubricating function of the existing structure is filled.

Description

Technical Field

[0001] The invention belongs to the technical field of screws, and in particular relates to a self-drilling and hole-expanding screw and a use method thereof. Background Art

[0002] Self-tapping screws are used for the installation of structural parts with high efficiency and good fixing effect, and even no drilling is required. The threads in the rear area have a cylindrical outer diameter, and the threads in the front area extend with the outer diameter reduced toward the end of the screw. A self-expanding self-tapping screw is disclosed in announcement number CN203113631U, which can expand the installation hole to solve the influence of "thermal expansion and contraction" on the plastic roof.

[0003] However, the reaming screw in the above patent does not have a self-lubricating function. During long-term use, the reaming screw is prone to rust and lock with the connection position. When it needs to be disassembled later, it is easy to cause inconvenience in disassembly. Therefore, there are great limitations in its use and there is room for improvement. Summary of the invention

[0004] The object of the present invention is to provide a self-drilling and hole-reaming screw and a method of using the same, so as to solve the problem that the hole-reaming screw mentioned in the above background technology does not have a self-lubricating function.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-drilling and reaming screw, the screw comprising a connecting portion, the surface of which is provided with a thread, and a reaming cutter is fixed at the top of the thread. During installation, the connection with the external object is first achieved through the thread, and the position of the connecting hole is expanded by the reaming cutter during continuous screwing in; a fastening portion is integrally fixed at the top of the connecting portion; an inner hole extending downward is provided at the top of the connecting portion, the top of the inner hole is connected to the fastening portion, and a lubrication component is placed in the inner hole, the lubrication component is composed of a sealing component and an oil storage component, wherein the oil storage component is inserted into the inner hole and seamlessly fits with the inner wall of the inner hole; the sealing component is at the top of the oil storage component and abuts against the inner wall of the opening of the fastening portion, so as to achieve sealing of the oil storage component and avoid leakage.

[0006] As a preferred technical solution in the present invention, the oil storage part includes an inner tube, which is a hollow cylindrical structure without a top. An oil seepage hole is opened on the surface of the inner tube, and an oil outlet hole corresponding to the oil seepage hole is opened on the surface of the connecting part. Lubricating oil is injected into the interior of the inner tube. When the oil seepage hole is connected with the oil outlet hole, the lubricating oil inside the inner tube will be directly discharged to lubricate the connecting part and its connecting structure. When the oil seepage hole is not connected with the oil outlet hole, the lubricating oil inside the inner tube will not flow out. The sealing part is inserted into the top opening of the inner tube to achieve sealing.

[0007] As a preferred technical solution in the present invention, a spring is further arranged between the bottom end of the inner tube and the inner hole. The spring supports the inner tube when not squeezed by external force, and staggers the oil seepage hole and the oil outlet hole, thereby achieving sealing and blocking of the lubricating oil.

[0008] As a preferred technical solution in the present invention, the sealing member includes an integrally arranged rubber plug and a sealing plug, wherein the sealing plug is inserted into the opening of the inner tube, and the rubber plug is inserted into the opening of the inner hole, thereby realizing the connection between the rubber plug and the inner hole. When lubrication is required, the rubber plug is squeezed downward and the spring is forced to compress. When the end face of the rubber plug is flush with the top opening of the inner hole, the oil seepage hole is aligned with the oil outlet hole, and the lubricating oil inside the inner tube can be discharged.

[0009] As a preferred technical solution in the present invention, the outer wall of the rubber plug is in abutment with the inner wall of the inner hole, the rubber plug and the sealing plug are made of elastic material, and the friction between the rubber plug and the inner hole is greater than the rebound force of the spring, thereby preventing the spring rebound from pushing the rubber plug out of the inner hole.

[0010] As a preferred technical solution in the present invention, a ridge hole is opened on the top surface of the fastening part, and a support platform is fixed on the inner wall of the ridge hole. The support platform is located above the end surface of the rubber plug. During normal installation, normal fastening can be achieved with the help of the support platform to avoid leakage of lubricating oil caused by directly pressing the rubber plug.

[0011] As a preferred technical solution in the present invention, dovetail heads are fixed on both sides of the bottom end of the connecting portion, and a rubber pad is also sleeved on the connecting portion, and the rubber pad is located between the reaming knife and the fastening portion.

[0012] The present invention also discloses a method for using a self-drilling and hole-expanding screw, comprising a screw, and the specific steps are as follows:

[0013] Step 1: first put the inner tube into the inner hole, then inject lubricating oil into the inner tube, and then install the rubber plug, sealing plug, inner hole and inner tube;

[0014] Step 2: Insert the installation tool into the ridge hole of the rubber plug and rotate the entire screw. At this time, the hole is opened through the dovetail head to achieve the purpose of self-drilling. Then, the installation is achieved through the thread on the connecting part, and the hole is expanded by the reaming knife during continuous rotation;

[0015] Step 3: The rubber plug is squeezed by the external extrusion part, and the rubber plug moves in the inner hole, and drives the inner tube to squeeze the spring through the sealing plug until the oil outlet hole is aligned with the oil seepage hole, and the lubricating oil inside the inner tube is discharged to achieve lubrication of the surface of the connection part.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Through the design of the present invention, lubricating oil is filled inside the reaming screw, and after completion, the self-lubricating function is realized as needed. When not in use, the internal lubricating oil is in a sealed state and will not leak out. During normal installation, it will not be affected. By injecting lubricating oil inside the screw, it can be convenient for later disassembly and assembly, which fills the technical gap in the lubrication function of the existing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 For the present invention Figure 1 A top view of

[0020] Figure 3 For the present invention Figure 1 A cross-sectional view of

[0021] Figure 4 For the present invention Figure 3 A magnified schematic diagram of area A in the middle.

[0022] In the figure:

[0023] 100, connecting part; 101, reaming knife; 102, fastening part; 103, dovetail head; 104, rubber pad; 105, supporting platform; 106, oil outlet hole; 107, inner hole;

[0024] 200, rubber plug; 201, sealing plug; 202, inner tube; 203, oil seepage hole; 204, spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 4 The present invention provides a technical solution: a self-drilling and hole-expanding screw, the screw comprising

[0027] The connection part 100 has a thread on its surface, and a reaming knife 101 is fixed on the top of the thread. During installation, the connection with the external object is first achieved through the thread, and during continuous screwing, the reaming knife 101 is used to expand the position of the connection hole;

[0028] The fastening portion 102 is integrally fixed at the top of the connecting portion 100;

[0029] The top of the connecting part 100 is provided with an inner hole 107 extending downward, the top of the inner hole 107 is connected with the fastening part 102, and a lubrication component is placed in the inner hole 107, which is composed of a sealing component and an oil storage component.

[0030] The oil storage component is inserted into the inner hole 107 and fits seamlessly with the inner wall of the inner hole 107; the sealing component is located at the top of the oil storage component and abuts against the inner wall of the opening of the fastening portion 102, thereby sealing the oil storage component and avoiding leakage.

[0031] In this embodiment, the oil storage part includes an inner tube 202, which is a hollow cylindrical structure without a top. An oil seepage hole 203 is opened on the surface of the inner tube 202, and an oil outlet hole 106 corresponding to the oil seepage hole 203 is opened on the surface of the connecting part 100. Lubricating oil is injected into the interior of the inner tube 202. When the oil seepage hole 203 is connected with the oil outlet hole 106, the lubricating oil inside the inner tube 202 will be directly discharged to achieve lubrication of the connecting part 100 and its connecting structure. When the oil seepage hole 203 is not connected with the oil outlet hole 106, the lubricating oil inside the inner tube 202 will not flow out, and the sealing part is inserted into the top opening of the inner tube 202 to achieve sealing.

[0032] In this embodiment, a spring 204 is further provided between the bottom end of the inner tube 202 and the inner hole 107. The spring 204 supports the inner tube 202 when not squeezed by external force, and staggers the oil seepage hole 203 and the oil outlet hole 106, thereby achieving sealing of the lubricating oil.

[0033] In this embodiment, the seal includes an integrally arranged rubber plug 200 and a sealing plug 201, wherein the sealing plug 201 is inserted into the opening of the inner tube 202, and the rubber plug 200 is inserted into the opening of the inner hole 107, thereby realizing the connection between the rubber plug 200 and the inner hole 107. When lubrication is required, the rubber plug 200 is pressed downward and the spring 204 is forced to compress. When the end face of the rubber plug 200 is flush with the top opening of the inner hole 107, the oil seepage hole 203 is aligned with the oil outlet hole 106, and the lubricating oil inside the inner tube 202 can be discharged.

[0034] In this embodiment, the outer wall of the rubber plug 200 is in abutment with the inner wall of the inner hole 107 , the rubber plug 200 and the sealing plug 201 are made of elastic materials, and the friction between the rubber plug 200 and the inner hole 107 is greater than the rebound force of the spring 204 , thereby preventing the spring 204 from rebounding and pushing the rubber plug 200 out of the inner hole 107 .

[0035] In this embodiment, a ridge hole is opened on the top surface of the fastening portion 102, and a support platform 105 is fixed on the inner wall of the ridge hole. The support platform 105 is located above the end surface of the rubber plug 200. During normal installation, normal fastening can be achieved with the help of the support platform 105 to avoid leakage of lubricating oil caused by directly pressing the rubber plug 200.

[0036] In this embodiment, dovetail heads 103 are fixed on both sides of the bottom end of the connecting portion 100 , and a rubber pad 104 is also sleeved on the connecting portion 100 , and the rubber pad 104 is located between the reaming knife 101 and the fastening portion 102 .

[0037] The present invention also discloses a method for using a self-drilling and hole-expanding screw, comprising a screw, and the specific steps are as follows:

[0038] Step 1: first put the inner tube 202 into the inner hole 107, then inject lubricating oil into the inner tube 202, and then install the rubber plug 200, the sealing plug 201, the inner hole 107 and the inner tube 202;

[0039] Step 2: Insert the installation tool into the prism hole of the rubber plug 200 and rotate the entire screw. At this time, the dovetail head 103 is used to open the hole to achieve the purpose of self-drilling. Then, the installation is achieved through the thread on the connecting part 100, and the hole is expanded by the reaming knife 101 during continuous rotation;

[0040] Step three: The rubber plug 200 is squeezed by an external extruder, and the rubber plug 200 moves in the inner hole 107 and drives the inner tube 202 to squeeze the spring 204 through the sealing plug 201 until the oil outlet hole 106 is aligned with the oil seepage hole 203, and the lubricating oil inside the inner tube 202 is discharged to achieve lubrication of the surface of the connecting part 100.

[0041] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-drilling and hole-expanding screw, the screw comprising The connecting part (100) has a thread on its surface, and a reamer (101) is fixed on the top of the thread; A fastening portion (102) integrally fixed at the top end of the connecting portion (100); Features: The top of the connecting portion (100) is provided with an inner hole (107) extending downward, the top of the inner hole (107) is in communication with the fastening portion (102), and a lubrication component is placed in the inner hole (107), the lubrication component is composed of a sealing component and an oil storage component, wherein The oil storage component is inserted into the inner hole (107) and fits seamlessly with the inner wall of the inner hole (107); the sealing component is located at the top of the oil storage component and abuts against the inner wall of the opening of the fastening portion (102).

2. A self-drilling and hole-enlarging screw according to claim 1, characterized in that: The oil storage component comprises an inner tube (202), which is a hollow cylindrical structure without a top. An oil seepage hole (203) is provided on the surface of the inner tube (202), and an oil outlet hole (106) corresponding to the oil seepage hole (203) is provided on the surface of the connecting portion (100). Lubricating oil is injected into the interior of the inner tube (202), and the sealing component is inserted into the top opening of the inner tube (202).

3. A self-drilling and hole-enlarging screw according to claim 2, characterized in that: A spring (204) is also arranged between the bottom end of the inner tube (202) and the inner hole (107); the spring (204) supports the inner tube (202) when not squeezed by external force, and displaces the oil seepage hole (203) and the oil outlet hole (106).

4. A self-drilling and hole-enlarging screw according to claim 3, characterized in that: The sealing component comprises a rubber plug (200) and a sealing plug (201) which are arranged in an integral manner, wherein the sealing plug (201) is inserted into the opening of the inner tube (202), and the rubber plug (200) is inserted into the opening of the inner hole (107).

5. A self-drilling and hole-enlarging screw according to claim 4, characterized in that: The outer wall of the rubber plug (200) is in abutment with the inner wall of the inner hole (107); the rubber plug (200) and the sealing plug (201) are made of elastic materials, and the friction force between the rubber plug (200) and the inner hole (107) is greater than the resilience of the spring (204).

6. The self-drilling and hole-reaming screw according to claim 1, characterized in that: The top end surface of the fastening portion (102) is provided with an angular hole, and a support platform (105) is fixed on the inner wall of the angular hole. The support platform (105) is located above the end surface of the rubber plug (200).

7. The self-drilling and hole-enlarging screw according to claim 1, characterized in that: Dovetail heads (103) are fixed on both sides of the bottom end of the connecting portion (100), and a rubber pad (104) is also sleeved on the connecting portion (100), and the rubber pad (104) is located between the reaming knife (101) and the fastening portion (102).

8. A method for using a self-drilling and hole-expanding screw, comprising the screw according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: Step 1: firstly put the inner tube (202) into the inner hole (107), then inject lubricating oil into the inner tube (202), and then install the rubber plug (200), the sealing plug (201), the inner hole (107) and the inner tube (202); Step 2: insert the installation tool into the prism hole of the rubber plug (200) and rotate the entire screw. At this time, the dovetail head (103) is used to open the hole to achieve the purpose of self-drilling. Then, the installation is achieved through the thread on the connecting part (100). During the continuous rotation, the hole is expanded by the expansion knife (101); Step 3: The rubber plug (200) is squeezed by an external extrusion member, and the rubber plug (200) moves in the inner hole (107), and drives the inner tube (202) to squeeze the spring (204) through the sealing plug (201), until the oil outlet hole (106) is aligned with the oil seepage hole (203), and the lubricating oil inside the inner tube (202) is discharged to achieve lubrication of the surface of the connecting part (100).

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