Inverted hexagonal spiral self drilling screw
By setting arc-shaped reinforcement ribs on the screw body of the drilling tail screw and improving the shape and tooth shape of the rotating thread, the problems of damaging the processed parts and increasing production costs in the prior art are solved, and smaller holes are achieved Size, lower production costs and faster screw-in speed.
Patent Information
- Application Number
- CN202421419011.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-20
AI Technical Summary
When existing drilling screws increase torque, they can easily damage the processed parts and increase production costs.
A reverse hexagonal spiral drill tail screw was designed, with multiple arc-shaped reinforcement ribs on the main body of the screw. The cross-section of the rotating thread is curved polygonal and the tooth is arc-shaped triangle.
At the same torque level, the hole size exposed by the machining parts is reduced, the production cost is reduced, the resistance during drilling is reduced, and the screwing speed is accelerated.
Smart Images
Figure CN222458026U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a self-drilling screw, in particular to a self-drilling screw with a reverse hexagonal spiral pattern. Background Art
[0002] Drill screws, also known as self-drilling screws, do not require pre-drilling when riveting workpieces. Drilling, tapping, locking and other operations can be completed on the material at one time, with high construction efficiency. Existing drill screws include a screw head, a screw rod and a drill tail, and the screw rod has a rotating thread. When in use, the drill screw is driven by an electric drill to screw into the workpiece. At the same time, the hand needs to apply a certain thrust to the electric drill so that the drill screw is rotated and fed forward, and finally fastened in the workpiece.
[0003] When the torque of the self-drilling screw is larger, it is easier to drill into the workpiece, and the thrust applied by the hand is smaller, which is more labor-saving. The torque is determined by the diameter of the screw. If you want to get a larger torque, you can only increase the diameter of the screw. However, the larger the diameter of the screw, the larger the hole in the workpiece, and the greater the damage. In addition, self-drilling screws with larger screw diameters require more materials during production, and the production cost is high. Utility Model Content
[0004] In order to solve the above deficiencies in the prior art, the utility model aims to provide a reverse hexagonal spiral drill screw, so as to reduce the size of the tapped hole and reduce the production cost under the premise of increasing the torque.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] A reverse hexagonal spiral drill screw comprises a screw head, a screw rod and a drill tail which are fixedly connected in sequence, the screw rod comprises a screw rod body and a rotating thread arranged on the screw rod body, a plurality of reinforcing ribs are arranged on the outer surface of the screw rod body, each reinforcing rib is in an arc shape, and a starting point of each reinforcing rib is arranged close to the screw head and an end point is arranged close to the drill tail, and the plurality of reinforcing ribs are arranged on the screw rod body in parallel and at equal intervals; the rotating thread is arranged on the outer surface of the screw rod body and the reinforcing ribs.
[0007] As a limitation of the present invention: in the projection of the vertical plane where the axial direction of the screw body is located, the line connecting the starting point and the end point of the same reinforcing rib forms a first straight line, and the angle formed by the first straight line and the axis of the screw body is an acute angle;
[0008] In the projection of the horizontal plane where the radial direction of the screw body is located, the line connecting the starting point and the end point of the same reinforcing rib forms a second straight line, and the second straight line is perpendicular to the axis of the screw body.
[0009] As another limitation of the present invention: the cross-section of the rotating thread is a curved polygon, the number of vertices of the curved polygon is equal to the number of reinforcing ribs, and the multiple vertices of the curved polygon are respectively located on different reinforcing ribs.
[0010] As a further limitation of the present invention: the tooth profile of the rotating thread is an arc-shaped triangle.
[0011] As a further limitation of the present invention: the number of reinforcing ribs is set to six, and the cross-section of the rotating thread is a curved hexagon.
[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:
[0013] The utility model is an improvement on the existing self-drilling screw. The main improvement is that a plurality of reinforcing ribs are added to the screw body. The starting point of each reinforcing rib is arranged close to the screw head and the end point is arranged close to the drill tail. The shape of each reinforcing rib is arc-shaped. The plurality of reinforcing ribs are arranged clockwise around the screw body in a spiral shape. Compared with the traditional method of increasing the screw body diameter to increase the torque, the embodiment achieves the same torque level. The hole tapped on the workpiece is small, the damage to the workpiece is small, and less material is used, saving material cost;
[0014] The utility model also makes improvements to the structure of the rotating thread and its tooth shape. The cross-section of the rotating thread is a curved polygon, and multiple vertices are respectively located on different reinforcing ribs. At the same time, the tooth shape is an arc-shaped triangle. This structure enables the screw to be more easily screwed into the workpiece, overcoming the problem of reduced driving torque due to increased friction, speeding up the screw-in speed and saving time.
[0015] In summary, the utility model not only improves the torque, but also reduces the size of the tapped hole, reduces the production cost, reduces the resistance during drilling, and speeds up the screwing speed; the utility model is suitable for the construction, machinery and other industries for fixing structural parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0017] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model;
[0018] Figure 2 for Figure 1 Sectional view along AA direction;
[0019] Figure 3 for Figure 1 Cross-section along line BB;
[0020] Figure 4 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;
[0021] Figure 5 for Figure 4 A magnified schematic diagram of part C;
[0022] Figure 6 It is a schematic diagram of the main structure of the embodiment of the utility model at another viewing angle;
[0023] Figure 7 for Figure 6 An enlarged schematic diagram of part D in the middle;
[0024] Figure 8 It is a structural schematic diagram of the connecting line between the starting and ending points of a reinforcement rib and the main axis of the screw in the vertical plane projection;
[0025] Fig. 9 It is a schematic diagram of the connecting structure of the starting point and end point of a reinforcement bar in the horizontal plane projection.
[0026] In the figure: 1- screw head;
[0027] 2-screw, 21-screw body, 22-rotating thread, 23-reinforcement rib;
[0028] 3-drill tail, 4-first straight line, 5-second straight line, 6-screw body axis. DETAILED DESCRIPTION
[0029] The preferred embodiment of the utility model is described below in conjunction with the accompanying drawings. It should be understood that the reverse hexagonal spiral thread self-drilling screw described here is a preferred embodiment, which is only used to illustrate and explain the utility model and does not constitute a limitation of the utility model.
[0030] like Figures 1 to 9 As shown, this embodiment includes a screw head 1, a screw rod 2 and a drill tail 3 which are fixedly connected in sequence, and the screw rod 2 includes a screw rod body 21 and a rotating thread 22 arranged on the screw rod body 21, wherein the screw rod body 21 is a cylindrical structure. This part of the content is the prior art, and the structure and connection relationship of the screw head 1, the drill tail 3 and the screw rod body 21 will not be described in detail in this embodiment.
[0031] There are two main improvements in this embodiment. First, a plurality of reinforcing ribs 23 are arranged at intervals on the outer surface of the screw body 21. The rotating thread 22 is arranged on the outer surface of the screw body 21 and the reinforcing ribs 23. The reinforcing ribs 23 can increase the overall torque. Second, the shape and tooth profile of the rotating thread 22 are changed. When tapping the workpiece, the resistance generated by the workpiece to this embodiment can be reduced, and drilling is more labor-saving.
[0032] 1. Strengthening ribs 23;
[0033] like Figure 1 , 4 As shown, in this embodiment, the number of reinforcing ribs 23 is set to six, the starting point of each reinforcing rib 23 is set close to the screw head 1, and the end point is set close to the drill tail 3. The shape of each reinforcing rib 23 is arc-shaped, and each reinforcing rib 23 is spirally distributed on the surface of the screw body 21. In this embodiment, six arc-shaped reinforcing ribs 23 are spirally arranged clockwise around the screw body 21. Specifically, take one of the reinforcing ribs 23 as an example: the starting point is point E, and the end point is point F;
[0034] In the projection of the vertical plane where the axial direction of the screw body 21 is located, the vertical plane projection here is the projection of the main viewing direction of the screw body 21, such as Figure 1 , 8 As shown, the line connecting the starting point and the end point of the same reinforcing rib 23 forms a first straight line 4, that is, point E and point F are connected to form the first straight line 4, and the angle α formed by the first straight line 4 and the screw body axis 6 is an acute angle;
[0035] In the projection of the horizontal plane where the screw body 21 is located in the radial direction, the horizontal plane projection is the projection of the screw body 21 in the upward direction, such as Figure 1 , 9 As shown, the line connecting the starting point and the end point of the same reinforcing rib 23 forms a second straight line 5, that is, point E and point F are connected to form the second straight line 5, and the second straight line 5 is perpendicular to the screw body axis 6. It should be noted that the second straight line 5 is located on the horizontal plane where the screw body 21 is radially located, and the screw body axis 6 is perpendicular to the screw body 21 radially, so the second straight line 5 is perpendicular to the screw body axis 6.
[0036] The six reinforcing ribs 23 are arranged on the screw body 21 in parallel and at equal intervals. In other words, two adjacent reinforcing ribs 23 are parallel, and the intervals between two adjacent reinforcing ribs 23 are equal.
[0037] In this embodiment, the diameter of the screw body 21 is not changed, and only six reinforcing ribs 23 are added at intervals on the outer surface of the screw body 21. During the tapping process, the reinforcing ribs 23 are spirally shaped to increase the torque of the screw. Compared with the traditional method of increasing the diameter of the screw body 21 to increase the torque, this embodiment, under the premise of achieving the same torque level, taps a smaller hole in the workpiece, causes less damage to the workpiece, and uses less material, saving material costs.
[0038] It should be noted that the number of the reinforcing ribs 23 in this embodiment can also be set to two, three, four or other numbers, as long as they are arranged at equal intervals and arranged in a spiral shape on the screw body 21.
[0039] 2. Rotating thread 22;
[0040] like Figure 1 ,3 As shown in Figures 4 and 5, the rotating thread 22 is arranged on the outer surfaces of the screw body 21 and the reinforcing ribs 23. The cross section of the rotating thread 22 is a curved polygon. The number of vertices of the curved polygon is equal to the number of the reinforcing ribs 23. Since the number of the reinforcing ribs 23 is six in this embodiment, the cross section of the rotating thread 22 is a curved hexagon, and the six vertices are respectively located on different reinforcing ribs 23, forming an inverse hexagonal rotating thread.
[0041] It should be noted that if the number of reinforcing ribs 23 is set to three, then the cross-section of the rotating thread 22 will be a curved triangle, as long as the number of vertices of the curved polygon is equal to the number of reinforcing ribs 23 and each reinforcing rib 23 has a vertex.
[0042] When in use, the drill tail 3 taps a small hole on the workpiece to facilitate the screw body 21 to be screwed in. When the hexagonal rotating thread 22 is screwed into the workpiece, the workpiece is tapped at six points (i.e., each reinforcing rib 23 has a vertex, a total of six), which can reduce the resistance during the tapping process, prevent the screw from moving, play a role in tightening and preventing loosening, and make the workpiece connection more secure.
[0043] like Figure 7 As shown, the tooth profile of the rotating thread 22 is an arc-shaped triangle, which increases the friction force of the thread slope, can better maintain tightness, and increases the reliability of the connection.
[0044] In this embodiment, because the rotating thread 22 is arranged in a curved hexagonal spiral and its tooth profile is an arc-shaped triangle, the screw 2 can be more easily screwed into the workpiece, overcoming the problem of reduced driving torque due to increased friction, accelerating the screw-in speed and saving time.
[0045] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiment, those skilled in the art can still modify the technical solutions recorded in the above embodiment or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A reverse hexagonal spiral drill screw, comprising a screw head, a screw rod and a drill rod which are fixedly connected in sequence, wherein the screw rod comprises a screw rod body and a rotating thread arranged on the screw rod body, characterized in that: A plurality of reinforcing ribs are arranged on the outer surface of the screw body, each of which is arc-shaped, and the starting point of each reinforcing rib is arranged close to the screw head and the end point is arranged close to the drill tail. The plurality of reinforcing ribs are arranged on the screw body in parallel and at equal intervals; the rotating threads are arranged on the outer surfaces of the screw body and the reinforcing ribs.
2. The reverse hexagonal spiral self-drilling screw according to claim 1, characterized in that: In the projection of the vertical plane where the screw body axis is located, the line connecting the starting point and the end point of the same reinforcing rib forms a first straight line, and the angle formed by the first straight line and the screw body axis is an acute angle; In the projection of the horizontal plane where the radial direction of the screw body is located, the line connecting the starting point and the end point of the same reinforcing rib forms a second straight line, and the second straight line is perpendicular to the axis of the screw body.
3. A reverse hexagonal spiral self-drilling screw according to claim 1 or 2, characterized in that: The cross section of the rotating thread is a curved polygon, the number of vertices of the curved polygon is equal to the number of reinforcing ribs, and the multiple vertices of the curved polygon are respectively located on different reinforcing ribs.
4. The reverse hexagonal spiral self-drilling screw according to claim 3, characterized in that: The tooth profile of the rotating thread is an arc-shaped triangle.
5. The reverse hexagonal spiral self-drilling screw according to claim 4, characterized in that: The number of reinforcing ribs is set to six, and the cross-section of the rotating thread is a curved-edge hexagon.