Self drilling screw with spiral head

Abstract

The utility model discloses a spiral head self drilling screw which comprises a screw female head, a screw rod and a screw drill tail which are integrally formed, the screw female head comprises a six-edge clamping head and an extrusion ring edge from top to bottom, and a plurality of spiral clamping cones are fixedly connected to the bottom end of the extrusion ring edge at equal intervals. The bottom ends of the multiple spiral clamping cones are provided with open type rubber gaskets. The screw drill tail comprises a cylindrical section, a circular truncated cone section and a spherical section which are integrally formed from top to bottom, a plurality of spiral cutting arms are fixedly connected to the outer wall of the cylindrical section at equal intervals, and the bottom ends of the spiral cutting arms extend to the middle of the outer wall of the circular truncated cone section. According to the self-drilling screw, the spherical section and the circular truncated cone section are matched with the spiral cutting groove and the spiral cutting arm, so that the self-drilling screw can be quickly drilled into a material under the action of small axial force, and the mounting speed of the self-drilling screw is increased; meanwhile, the spiral clamping cone enables the opening type rubber gasket to be rapidly attached to the material surface, and the sealing performance of the extrusion ring edge and the material surface is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-drilling screws, in particular to a spiral 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. 202322273449.2 discloses a hexagonal washer drill screw, including a screw body, one end of the screw body is provided with a hexagonal washer head, and the other end is provided with a drill tail part, and the screw body is covered with a combined washer close to the hexagonal washer head; the combined washer is composed of two C-type washers of the same shape and size arranged coaxially, and the C-type washer is provided with an opening, and the openings on the two C-type washers are staggered; one end face of the C-type washer is provided with a positioning protrusion and a positioning groove with an interval angle of 180 degrees and mutually adapted and inserted; two positioning protrusions and two positioning grooves are provided on the same C-type washer; the positioning protrusions are symmetrically arranged on both sides of the opening; the positioning protrusions are close to the opening.

[0004] The above patent has the following shortcomings: the self-drilling screw is composed of two C-shaped washers that can be quickly assembled by setting the combination washer, and the C-shaped washer has an opening, so that assembly can be achieved in the radial direction of the screw body; however, in actual use, the drill tail of the self-drilling screw is still a conventional shape. During use, a large axial force needs to be applied to the self-drilling screw so that the self-drilling screw can be drilled into an object, which is relatively laborious to use. Utility Model Content

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

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

[0007] A spiral head self-drilling screw comprises: an integrally formed screw female head, a screw threaded rod and a screw drill tail, wherein the screw female head comprises a hexagonal clamping head and an extrusion ring edge from top to bottom, a plurality of spiral clamping cones are equidistantly fixedly connected to the bottom end of the extrusion ring edge, and an open rubber gasket is arranged at the bottom end of the plurality of spiral clamping cones; the screw drill tail comprises an integrally formed cylindrical section, a truncated cone section and a spherical section from top to bottom, a plurality of spiral cutting arms are equidistantly fixedly connected to the outer wall of the cylindrical section, the bottom end of the spiral cutting arm extends to the middle of the outer wall of the truncated cone section, a plurality of spiral cutting grooves are equidistantly opened on the outer wall of the truncated cone section, and the spiral cutting grooves penetrate the spherical section.

[0008] As a further solution of the utility model: the screw rod comprises an integrally formed large-diameter column and a variable-diameter column from top to bottom, and the outer walls of the large-diameter column and the variable-diameter column are integrally formed with an outwardly convex variable-diameter thread.

[0009] As a further solution of the utility model: the spiral center of the spiral clamping cone is the axis of the self-drilling screw, and the bottom end of the spiral clamping cone is set to be a pointed cone.

[0010] As a further solution of the utility model: the bottom end of the spiral clamping cone is inserted into the interior of the open rubber gasket, and the top end of the hexagonal clamping head is provided with a cross clamping groove.

[0011] As a further solution of the utility model: a cutting and scraping edge is arranged at the top end of the outer wall of the spiral cutting arm, and a circular arc chamfer is arranged at the bottom end of the outer wall of the spiral cutting arm.

[0012] As a further solution of the utility model: a cutting edge is arranged at the bottom end of the spiral cutting arm, and the angle between the bottom end surface of the cutting edge and the horizontal plane is set as a cutting sinking angle, and the cutting sinking angle is set to ten degrees.

[0013] As a further solution of the utility model: the spiral cutting groove and the spiral cutting arm have the same rotation direction and pitch, and a plane chamfer is provided on the outer side of the groove wall at the top end of the spiral cutting groove.

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

[0015] The spiral head self-drilling screw, through the cooperation of the spherical section, the frustum section, the spiral cutting groove and the spiral cutting arm, enables the screw drill tail to quickly drill into the material under the action of a relatively small axial force, thereby improving the installation speed of the self-drilling screw; at the same time, the spiral clamping cone enables the open rubber gasket to quickly fit the surface of the material, thereby increasing the sealing performance between the extrusion ring edge and the surface of the material.

[0016] The spiral head self-drilling screw squeezes the debris inside the drill hole through the convex variable diameter thread and the variable diameter column, reduces the amount of drilling debris discharged, and uses the compressed drilling debris to further improve the tightness of the connection between the screw rod and the material.

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

[0020] Figure 3 This is a schematic diagram of the planar structure of the front side of the self-drilling screw of the utility model;

[0021] Figure 4 It is a schematic diagram of the planar structure of the side surface of the self-drilling screw of the utility model;

[0022] Figure 5 For this utility model Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0023] In the figure: 1. Screw female head; 11. Hexagonal chuck; 12. Extrusion ring edge; 13. Spiral chuck cone; 14. Cross slot; 2. Screw and threaded rod; 21. Large diameter column; 22. Variable diameter column; 23. Outer convex variable diameter thread; 3. Screw drill tail; 31. Cylindrical section; 32. Cone section; 33. Spherical section; 34. Spiral cutting arm; 35. Spiral cutting groove; 4. Open rubber gasket; a. Cutting and leveling edge; b. Circular chamfer; c. Plane chamfer one; d. Plane chamfer two; e. Cutting edge normal; f. Cutting end face normal; g. Horizontal plane line; x. Chip lifting angle; y. Cutting sinking angle. DETAILED DESCRIPTION

[0024] 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.

[0025] A spiral head self-drilling screw, such as Figures 1 to 5 As shown, it includes: an integrally formed screw female head 1, a screw threaded rod 2 and a screw drill tail 3. The screw female head 1 includes a hexagonal clamping head 11 and an extruded ring edge 12 from top to bottom. The extruded ring edge 12 is integrally formed at the bottom end of the hexagonal clamping head 11.

[0026] The bottom end of the extrusion ring 12 is equidistantly fixedly connected with a plurality of spiral clamping cones 13, the bottom ends of the plurality of spiral clamping cones 13 are provided with open rubber washers 4, and the top end of the hexagonal clamping head 11 is provided with a cross clamping groove 14, and the cross clamping groove 14 and the hexagonal clamping head 11 are both used for installing and removing self-drilling screws.

[0027] The spiral center of the spiral cone 13 is the axis of the drill screw, and the bottom end of the spiral cone 13 is set to a pointed cone shape, and the bottom end of the spiral cone 13 is inserted into the open rubber gasket 4; when the open rubber gasket 4 is in contact with the surface of the object, the open rubber gasket 4 is driven by the spiral cone 13 to rub against the surface of the object to form a friction surface, while further squeezing the sealing between the ring edge 12 and the surface of the object.

[0028] The screw rod 2 includes an integrally formed large diameter column 21 and a variable diameter column 22 from top to bottom, and the outer walls of the large diameter column 21 and the variable diameter column 22 are integrally formed with an outwardly convex variable diameter thread 23; the large diameter column 21 is arranged at the bottom end of the extrusion ring edge 12, and the open rubber gasket 4 is sleeved on the top of the outer wall of the large diameter column 21.

[0029] The diameter of the variable diameter column 22 decreases from top to bottom, and the convex variable diameter thread 23 taps the drill hole of the self-drilling screw, while further compacting the debris inside the drill hole of the object, thereby improving the stability of the installation of the self-drilling screw.

[0030] The screw drill tail 3 includes an integrally formed cylindrical section 31 , a truncated cone section 32 and a spherical section 33 from top to bottom. The cylindrical section 31 is fixedly connected to the bottom end of the variable diameter column 22 , and the diameter of the cylindrical section 31 is the same as the diameter of the bottom end surface of the variable diameter column 22 .

[0031] The truncated cone section 32 is configured to be larger at the top and smaller at the bottom, i.e., the top diameter is the same as the diameter of the cylindrical section 31, and the bottom diameter is smaller than the top diameter; the diameter of the spherical section 33 is larger than the bottom diameter of the truncated cone section 32, but the connection between the spherical section 33 and the bottom end of the truncated cone section 32 has a smooth transition.

[0032] The outer wall of the cylindrical section 31 is equidistantly fixed with multiple spiral cutting arms 34, and the bottom end of the spiral cutting arm 34 extends to the middle of the outer wall of the conical section 32. The rotation direction of the spiral cutting arm 34 is the same as that of the external convex variable diameter thread 23, but the pitch of the spiral cutting arm 34 is much larger than the pitch of the external convex variable diameter thread 23.

[0033] The outer wall of the truncated cone section 32 is provided with a plurality of spiral cutting grooves 35 at equal intervals, and the spiral cutting grooves 35 penetrate the spherical section 33. The spiral cutting grooves 35 have the same rotation direction and pitch as the spiral cutting arms 34, and the distances from the outer sides of the spiral cutting arms 34 to the outer walls of the cylindrical section 31 and the truncated cone section 32 are the same, that is, the spiral cutting arms 34 on the outer wall of the truncated cone section 32 have a gradually reduced spiral diameter while the pitch remains unchanged, and the spiral cutting grooves 35 are used to quickly perform drilling and cutting of objects.

[0034] Reference Figure 5 ;

[0035] The top of the outer wall of the spiral cutting arm 34 is provided with a cutting and leveling blade a, and the bottom of the outer wall of the spiral cutting arm 34 is provided with an arc chamfer b. The cutting and leveling blade a levels the inner wall of the drilled hole of the object, improves the smoothness of the inner wall of the drilled hole of the object, and facilitates the tapping of the convex variable diameter thread 23.

[0036] A plane chamfer c is provided on the outer side of the groove wall at the top end of the spiral cutting groove 35, and a plane chamfer d is provided on the side of the groove wall on the back end of the top of the spiral cutting groove 35. The plane chamfer c facilitates the cutting of materials on the side of the groove wall at the bottom end of the spiral cutting groove 35, and the plane chamfer d facilitates the discharge of cutting debris inside the spiral cutting groove 35.

[0037] A cutting edge is provided at the bottom end of the spiral cutting arm 34. The angle between the cutting edge normal line e at the top of the cutting edge and the horizontal plane line g of the horizontal plane is set to the cutting chip lifting angle x. The cutting chip lifting angle x is set to sixty degrees. During the process of drilling and cutting the material by the cutting edge, the cutting debris is quickly lifted, thereby increasing the speed at which the screw drill tail 3 drills into the material.

[0038] The angle between the cutting end face normal line f of the bottom end face of the cutting edge and the horizontal plane line g of the horizontal plane is set as the cutting sinking angle y, and the cutting sinking angle y is set to ten degrees, so that the bottom end face of the cutting edge is always in contact with the bottom end face of the material drilling hole, stably controlling the drilling speed and ensuring the drilling quality.

[0039] Working principle:

[0040] Please refer to Figures 1 to 5 , the device is manufactured as shown in the figure;

[0041] When the self-drilling screw is in use, the spherical section 33 is firstly made to fit with the surface of the material, and the axis of the self-drilling screw is made perpendicular to the surface of the hole. Then, force is applied along the axial direction of the self-drilling screw through the hexagonal chuck 11, and the self-drilling screw is rotated clockwise. The spherical section 33 is quickly drilled into the interior of the material with the cooperation of the spiral cutting groove 35. When the cutting edge of the spiral cutting arm 34 contacts the material, the material hole is quickly expanded and continues to penetrate into the interior of the material. When the screw rod 2 enters the interior of the material, the material debris inside the hole is quickly fitted with the inner wall of the hole. Under the joint action of the variable diameter column 22 and the convex variable diameter thread 23, the amount of material debris discharged from the hole is reduced, and the gaps between the material debris are compressed. When the extrusion ring 12 squeezes the material surface through the open rubber gasket 4, the mutual friction between the material debris and the self-drilling screw increases the stability of the self-drilling 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 spiral head self-drilling screw, characterized in that: include: An integrally formed screw female head (1), a screw threaded rod (2) and a screw drill tail (3), wherein the screw female head (1) comprises, from top to bottom, a hexagonal clamping head (11) and an extrusion ring edge (12), the bottom end of the extrusion ring edge (12) being equidistantly fixedly connected to a plurality of spiral clamping cones (13), the bottom ends of the plurality of spiral clamping cones (13) being provided with open rubber washers (4); the screw drill tail (3) comprises, from top to bottom, an integrally formed cylindrical section (31), a truncated cone section (32) and a spherical section (33), the outer wall of the cylindrical section (31) being equidistantly fixedly connected to a plurality of spiral cutting arms (34), the bottom end of the spiral cutting arms (34) extending to the middle of the outer wall of the truncated cone section (32), the outer wall of the truncated cone section (32) being equidistantly provided with a plurality of spiral cutting grooves (35), the spiral cutting grooves (35) penetrating the spherical section (33).

2. A spiral head self-drilling screw according to claim 1, characterized in that: The screw rod (2) comprises, from top to bottom, an integrally formed large-diameter column (21) and a variable-diameter column (22), and the outer walls of the large-diameter column (21) and the variable-diameter column (22) are integrally formed with an externally convex variable-diameter thread (23).

3. The spiral head self-drilling screw according to claim 1, characterized in that: The spiral center of the spiral clamping cone (13) is the axis of the self-drilling screw, and the bottom end of the spiral clamping cone (13) is arranged in a pointed cone shape.

4. A spiral head self-drilling screw according to claim 3, characterized in that: The bottom end of the spiral clamping cone (13) is inserted into the interior of the open rubber gasket (4), and the top end of the hexagonal clamping head (11) is provided with a cross clamping groove (14).

5. The spiral head self-drilling screw according to claim 1, characterized in that: The top end of the outer wall of the spiral cutting arm (34) is provided with a cutting and scraping edge (a), and the bottom end of the outer wall of the spiral cutting arm (34) is provided with a circular arc chamfer (b).

6. The spiral head self-drilling screw according to claim 1, characterized in that: The bottom end of the spiral cutting arm (34) is provided with a cutting edge, and the angle between the bottom end surface of the cutting edge and the horizontal plane is set to a cutting sinking angle (y), and the cutting sinking angle (y) is set to ten degrees.

7. The spiral head self-drilling screw according to claim 1, characterized in that: The spiral cutting groove (35) and the spiral cutting arm (34) have the same rotation direction and pitch, and a plane chamfer (c) is provided on the outer side of the groove wall at the top end of the spiral cutting groove (35).

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