Flat-head self-drilling screw

Abstract

The utility model discloses a flat head self drilling screw which comprises a round flat head, a screw rod and a reinforcing type flat head drill tail which are integrally formed from top to bottom, the reinforcing type flat head drill tail comprises a drilling flat head body and two anti-reversion reinforcing arms, and a plurality of side cutting edges are fixedly connected to the two sides of the drilling flat head body. A plurality of anti-reversion clamping teeth are fixedly connected to one side of the anti-reversion reinforcing arm at equal intervals, and a plurality of bent adaptive angle grooves I are formed in the other side of the anti-reversion reinforcing arm at equal intervals; a plurality of second bent adaptive angle grooves are formed in the outer side of the anti-reversion reinforcing arm at equal intervals, and a plurality of anti-reversion clamping arms are fixedly connected to the side at equal intervals. According to the anti-reverse-rotation reinforcing arm, the anti-reverse-rotation clamping teeth can be in friction and clamping fit with material chippings in a drill hole, the influence of the torque enabling the self drilling screw to be unscrewed is reduced, meanwhile, the anti-reverse-rotation clamping arms can be inserted into the inner wall of the drill hole, the bent anti-reverse-rotation reinforcing arms are prevented from rotating clockwise, and then the purpose of preventing the self drilling screw from being unscrewed is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-drilling screws, in particular to a flat head self-drilling screw. Background Art

[0002] In the prior art, a self-drilling screw is a screw with a self-drilling head at the front end of the screw. Existing self-drilling screws can be divided into round head screw / cross screw / twin screw, countersunk head (flat head) / screw / cross screw / twin screw, hexagonal washer, round head washer (large flat head), trumpet head, etc. according to the different drilling heads.

[0003] After searching, the Chinese patent application No. 201921721753.6 discloses a large flat head round cover self-drilling screw, including a large flat head, a round cover arranged on the large flat head, and a screw arranged on the side wall of the round cover away from the large flat head and having a thread on the outer wall, a cross groove is provided on the side wall of the large flat head away from the round cover, a threaded hole is provided on the side wall of the round cover away from the large flat head, a connecting thread matching with the threaded hole is provided on one end of the screw near the round cover, and a screw located in the threaded hole is provided with a threaded hole. A fixing hole is opened, and a fixing pin which is plugged and matched with the fixing hole is slidably penetrated on the round cover; when the cross groove on the large flat head is worn, a tool is used to push one end of the fixing pin, and then the fixing pin is pulled away from the fixing hole, and then the fixing pin is turned to rotate the round cover, so that the round cover is separated from the screw rod, and then the plate can be removed, and the operation is convenient, thereby achieving the purpose of convenient disassembly; at the same time, a new large flat head and round cover are replaced and threadedly connected to the screw rod, and then the fixing pin is plugged and installed, so that it becomes a new screw, and the screw can be reused.

[0004] The above patent has the following deficiencies: the device sets a chip groove so that after the screw penetrates the plate, the powdery debris after cutting is easier to discharge, thereby reducing the force of the screw on the plate and reducing the probability of the plate cracking; however, in actual use, the stability of the drill screw and the material mainly depends on the tension formed by the drill tail and the screw rod, and during long-term use, the connectivity between the material drill hole and the drill screw will be reduced, and thread withdrawal and shaking may occur. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and provides a flat head self-drilling screw.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A flat head drill tail screw comprises: a round flat head, a screw rod and a reinforced flat head drill tail integrally formed from top to bottom, the reinforced flat head drill tail comprising a drilling flat head main body and two anti-reversal reinforcement arms, both sides of the drilling flat head main body are fixedly connected with a plurality of side cutting edges, one side of the anti-reversal reinforcement arm is evenly fixedly connected with a plurality of anti-reversal teeth, and the other side is evenly opened with a plurality of curved adaptation angle grooves 1; the outer side of the anti-reversal reinforcement arm is evenly opened with a plurality of curved adaptation angle grooves 2, and the side is evenly fixedly connected with a plurality of anti-reversal arms, the inner side of the anti-reversal reinforcement arm is evenly fixedly connected with a plurality of connection protrusions, and the connection protrusions are fixedly connected to the screw rod.

[0008] As a further solution of the utility model: the bottoms of the front and back sides of the drilling flat head body are provided with chip removal cutting grooves, and the top of one side of the drilling flat head body is provided with a second glue outlet hole.

[0009] As a further solution of the utility model: a plurality of glue outlet holes three are equidistantly opened on the top of the front side of the drilling flat head body, and the plurality of glue outlet holes three are connected to the glue outlet hole two.

[0010] As a further solution of the utility model: the bottom end of the screw rod is symmetrically arranged on two chip removal inclined surfaces, and a glue outlet hole 1 is opened in the middle of the chip removal inclined surfaces.

[0011] As a further solution of the utility model: a glue injection hole is opened inside the screw rod, and the glue injection hole is connected to the glue outlet hole.

[0012] As a further solution of the utility model: a hexagonal slot is provided at the top of the round flat head, and a cross slot is provided at the bottom groove wall of the hexagonal slot.

[0013] As a further solution of the utility model: the top end of the glue injection hole is connected to the cross slot, and the bottom end of the glue injection hole is connected to the second glue outlet hole.

[0014] Compared with the prior art, the utility model provides a flat head self-drilling screw, which has the following beneficial effects:

[0015] The flat head drill screw can rub and engage with material debris inside the drill hole through the anti-reverse clamping teeth, thereby reducing the influence of the torque that causes the drill screw to back out. At the same time, the anti-reverse clamping arm can be inserted into the inner wall of the drill hole to hinder the anti-reverse reinforcement arm from rotating clockwise after being bent, thereby achieving the purpose of preventing the drill screw from backing out.

[0016] The flat head self-drilling screw injects liquid glue into the inside of the drill hole through the glue injection hole, the first glue outlet hole, the second glue outlet hole and the third glue outlet hole, so that the liquid glue impregnates material debris inside the drill hole, the self-drilling screw and the inner wall of the drill hole, thereby increasing the connectivity between the self-drilling screw and the material and further improving the installation stability of the self-drilling screw.

[0017] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the self-drilling screw of the utility model;

[0019] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 It is a partial cross-sectional structural schematic diagram of the self-drilling screw of the utility model;

[0021] Figure 4 For this utility model Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0022] Figure 5 The front view (left) and side view (right) of the self-drilling screw of the utility model;

[0023] Figure 6 For this utility model Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0024] Figure 7 For this utility model Figure 6 Schematic diagram of the enlarged structure at D in the middle;

[0025] Figure 8 For this utility model Figure 6 Schematic diagram of the enlarged structure at E in the middle.

[0026] In the figure: 1. round flat head; 2. hexagonal slot; 3. cross slot; 4. screw; 401. chip removal slope; 402. glue outlet hole 1; 403. glue injection hole; 5. reinforced flat head drill tail; 501. drilling flat head body; 502. glue outlet hole 2; 503. glue outlet hole 3; 504. side cutting edge; 505. chip removal cutting groove; 506. anti-reversal reinforcement arm; 507. connecting protrusion; 508. anti-reversal tooth; 509. bending adaptation angle slot 1; 510. bending adaptation angle slot 2; 511. anti-reversal clamping arm. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] A flat head self-drilling screw, such as Figures 1 to 8As shown, it includes: a round flat head 1, a screw rod 4 and a reinforced flat head drill tail 5 which are integrally formed from top to bottom. A hexagonal slot 2 is provided at the top of the round flat head 1. The hexagonal slot 2 is adapted to a hexagonal wrench to facilitate the installation and removal of the drill screw. A cross slot 3 is provided on the bottom groove wall of the hexagonal slot 2. The cross slot 3 is adapted to a flat screwdriver and a plum blossom screwdriver. The drill screw can be installed and removed without a hexagonal wrench.

[0029] The bottom end of the screw rod 4 is symmetrically arranged on two chip removal inclined surfaces 401, a glue outlet hole 402 is opened in the middle of the chip removal inclined surfaces 401, and a glue injection hole 403 is opened inside the screw rod 4, the glue injection hole 403 is connected with the glue outlet hole 402, and the top of the glue injection hole 403 is connected with the cross slot 3, which is convenient for glue injection and enhances the stability of the drill screw.

[0030] The reinforced flat head drill tail 5 includes a drilling flat head body 501 and two anti-reversal reinforcement arms 506. The drilling flat head body 501 is arranged between two chip removal inclined surfaces 401 and is fixedly connected to the screw 4. The two anti-reversal reinforcement arms 506 are respectively integrally formed on both sides of the top of the drilling flat head body 501.

[0031] A second glue outlet hole 502 is provided at the top of one side of the drilling flat head body 501 , and a plurality of third glue outlet holes 503 are equidistantly provided at the top of the front side of the drilling flat head body 501 . The plurality of third glue outlet holes 503 are connected to the second glue outlet hole 502 , and the second glue outlet hole 502 is connected to the glue injection hole 403 .

[0032] Both sides of the drilling flat head body 501 are provided with adaptive chip collection grooves, and two side cutting edges 504 are integrally formed inside the adaptive chip collection grooves. The bottom end of the drilling flat head body 501 is set to be a square cone, and the bottom of the front and back sides of the drilling flat head body 501 are provided with chip removal cutting grooves 505, which is convenient for the square cone to quickly drill holes in the material.

[0033] like Figure 6 and Figure 7 As shown, the angle between the bottom end surface of the side cutting edge 504 and the horizontal plane is set to a, and the angle between the side surface of the square cone at the bottom end of the drilling flat head body 501 and the horizontal plane is set to b. Both a and b are set to thirty degrees, which can not only quickly drill the material, but also reduce the wear of the square cone and ensure the continuous drilling ability of the square cone.

[0034] like Figure 7 As shown, a plurality of curved adaptation angle grooves 510 are equidistantly provided on the outer side of the anti-reversal reinforcement arm 506, and the curved adaptation angle grooves 510 are arranged in a triangle shape, and the opening angle thereof is set to d, and d is set to thirty degrees; and a plurality of anti-reversal clamping arms 511 are equidistantly and fixedly connected to the side, and the top of the anti-reversal clamping arm 511 is inclined, and the angle between the anti-reversal clamping arm 511 and the vertical plane is set to c, and c is set to forty-five degrees.

[0035] The inner side of the anti-reversal reinforcement arm 506 is equidistantly fixedly connected with a plurality of connection protrusions 507 , and the connection protrusions 507 are fixedly connected to the screw 4 .

[0036] The drill screw rotates counterclockwise and screws into the material; when the drilling flat head body 501 drills into the material, the material debris inside the drill hole squeezes the anti-reversal reinforcement arm 506, causing the connecting protrusion 507 to break, and the anti-reversal clamping arm 511 bends in the opposite direction of the rotation direction of the drill screw.

[0037] The anti-reversal reinforcement arm 506 is equidistantly fixedly connected with a plurality of anti-reversal teeth 508 on one side close to the drilling flat head body 501 for cutting materials, and a plurality of curved adaptation angle grooves 509 are equidistantly opened on the other side. The plurality of curved adaptation angle grooves 509 are correspondingly connected with the plurality of curved adaptation angle grooves 510. The curved adaptation angle grooves 510 are arranged in a triangle, and the opening angle thereof is set to e, and e is set to thirty degrees.

[0038] Working principle:

[0039] Please refer to Figures 1 to 8 , manufacture the self-drilling screw as shown in the figure;

[0040] When the self-drilling screw is in use, firstly, the square cone tip of the drilling flat head body 501 is made to fit with the surface of the material, so that the axis of the self-drilling screw is perpendicular to the surface of the drilling hole; then, the self-drilling screw is rotated counterclockwise, and the drilling flat head body 501 and the side cutting edge 504 quickly cut the surface of the material, so that the self-drilling screw drills into the material; when the screw rod 4 of the self-drilling screw partially enters the drill hole, the material debris generated in the drill hole squeezes the anti-reversal reinforcement arm 506, so that the connecting protrusion 507 breaks, and the anti-reversal reinforcement arm 506 Bending occurs until the screw rod 4 completely enters the material and the round flat head 1 fits against the surface of the material hole; the drill screw that has been tightened will not separate from the material hole when there is no large external force. When a torque is generated to cause the drill screw to back out, the anti-reverse tooth 508 will rub and engage with the material debris inside the hole, reducing the influence of the torque. At the same time, the anti-reverse arm 511 will be inserted into the inner wall of the hole, hindering the anti-reverse reinforcement arm 506 from rotating clockwise after bending, thereby achieving the purpose of preventing the drill screw from backing out.

[0041] On the basis of the above content, liquid glue can also be injected into the drill hole through the glue injection hole 403, the glue outlet hole 1 402, the glue outlet hole 2 502 and the glue outlet hole 3 503, so that the liquid glue can impregnate the material debris, the drill screw and the inner wall of the drill hole, thereby increasing the connectivity between the drill screw and the material and further improving the installation stability of the drill screw.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flat head self-drilling screw, characterized in that: include: A round flat head (1), a screw (4) and a reinforced flat head drill tail (5) are integrally formed from top to bottom, wherein the reinforced flat head drill tail (5) comprises a drilling flat head body (501) and two anti-reversal reinforcement arms (506), both sides of the drilling flat head body (501) are fixedly connected to a plurality of side cutting edges (504), one side of the anti-reversal reinforcement arm (506) is evenly fixedly connected to a plurality of anti-reversal teeth (508), and the other side is evenly opened with a plurality of curved adaptation angle grooves (509); the outer side of the anti-reversal reinforcement arm (506) is evenly opened with a plurality of curved adaptation angle grooves (510), and the side is evenly fixedly connected with a plurality of anti-reversal clamping arms (511), and the inner side of the anti-reversal reinforcement arm (506) is evenly fixedly connected with a plurality of connection protrusions (507), and the connection protrusions (507) are fixedly connected to the screw (4).

2. A flat head self-drilling screw according to claim 1, characterized in that: The bottoms of both the front and back sides of the drilling flat head body (501) are provided with chip removal cutting grooves (505), and the top of one side of the drilling flat head body (501) is provided with a second glue outlet hole (502).

3. The flat head self-drilling screw according to claim 1, characterized in that: A plurality of glue outlet holes (503) are equidistantly provided on the top of the front side of the drilling flat head body (501), and the plurality of glue outlet holes (503) are connected to the glue outlet hole (502).

4. The flat head self-drilling screw according to claim 1, characterized in that: The bottom end of the screw rod (4) is symmetrically arranged on two chip removal inclined surfaces (401), and a glue outlet hole (402) is opened in the middle of the chip removal inclined surface (401).

5. The flat head self-drilling screw according to claim 1, characterized in that: A glue injection hole (403) is provided inside the screw rod (4), and the glue injection hole (403) is connected to the glue outlet hole 1 (402).

6. The flat head self-drilling screw according to claim 1, characterized in that: The top of the round flat head (1) is provided with a hexagonal slot (2), and the bottom slot wall of the hexagonal slot (2) is provided with a cross slot (3).

7. The flat head self-drilling screw according to claim 5, characterized in that: The top end of the glue injection hole (403) is connected to the cross slot (3), and the bottom end of the glue injection hole (403) is connected to the second glue outlet hole (502).

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