Fast-assembly type flow drill screw

Abstract

The utility model relates to a fast-assembly type flow drill screw which comprises a screw body, a nut portion, a thread portion, a positioning portion, a pyramid portion and a centering portion are sequentially distributed on the screw body from top to bottom in the axis direction of the screw body, the cross section of the positioning portion is in an approximate arc triangle shape, and the cross section of the pyramid portion and the cross section of the positioning portion are in similar patterns. The screw head of the screw body adopts the pyramid portion with the cross section in the shape of the approximate arc triangle, so that a traditional conical head is replaced, when a nut portion is knocked and chambering is conducted, only the second conical face abuts against the hole wall of a bottom hole, the contact area during chambering is reduced, and the chambering resistance is reduced. The pneumatic / electric screwdriver rotates in the bottom hole through the positioning part to finish reaming, and the thread part is used for self-tapping the thread until locking, so that quick mounting is realized, and more labor is saved during mounting.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a quick-install flow drill screw. Background Art

[0002] Flow drill screws are quick-install self-tapping screws made of steel with galvanized and passivated surface. They are mostly used to connect thin metal plates. When connecting, first make a bottom hole for the workpiece to be connected, and then screw the self-tapping screw into the threaded bottom hole of the connected part. The threaded part of the self-tapping screw acts as a tap to cut out the thread connected to itself.

[0003] Among them, patent No. CN2024204545711 discloses a new type of flow drill screw, including a screw body, on which a nut part, a threaded part, a positioning part and a pointed cone part are sequentially distributed from top to bottom. However, in the actual installation process, when the bottom hole diameter is slightly smaller than the positioning part, the pointed cone part is required to expand the hole. Since the pointed cone part is a traditional cone shape, when expanding the hole, the contact area between the side of the pointed cone part and the bottom hole is large, and the nut part needs to be knocked hard, which is more laborious during installation and seriously affects the installation efficiency of the workpiece. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is a quick-install flow drill screw, including a screw body, and the screw body is provided with a nut portion, a threaded portion, a positioning portion, a pyramid portion and a centering portion in sequence from top to bottom along the axial direction of the screw body. The cross-section of the positioning portion is approximately an arc triangle, and the cross-section of the pyramid portion is a similar figure to the cross-section of the positioning portion. The pyramid portion is provided with side edges distributed in a circular pattern, and a first conical surface and a second conical surface are distributed at intervals through the side edges. In the same cross-section of the pyramid portion, the maximum distance from the first conical surface to the axis is less than the maximum distance from the second conical surface to the axis.

[0005] By adopting the above technical scheme, the utility model is mainly used for installing aluminum workpieces. The screw head of the screw body adopts a pyramidal part with a cross section that is approximately an arc triangle, thereby replacing the traditional conical head. During the installation process, the screw body is inserted into the bottom hole of the workpiece through the pyramidal part. When the nut part is struck and the hole is expanded, only the second conical surface abuts against the hole wall of the bottom hole, thereby reducing the contact area during expansion and reducing the resistance during expansion. The pneumatic / electric screwdriver is rotated in the bottom hole through the positioning part to complete the expansion, and the threaded part self-taps the thread until it is locked, thereby achieving quick installation and saving more effort during installation.

[0006] The utility model is further configured that the pyramid portion is provided with six groups of side edges, and three groups of the first conical surfaces and the second conical surfaces are distributed at intervals through the side edges, the side edges are inclined to the axis, and the angle a between the side edges and the axis is 10° to 15°, preferably 12.1°.

[0007] Furthermore, the first conical surface is provided with arc a and arc b at the upper and lower ends of the side edge line respectively, the arc length of arc a is greater than the arc length of arc b, the second conical surface is provided with arc c and arc d tangently connected to arc a and arc b, the arc length of arc c is greater than the arc length of arc d, and the cross-section of the positioning portion is an approximate arc triangle composed of arc a and arc c.

[0008] The above technical solution is adopted, in which the maximum distances between arcs a and b and the axis are 2.21 mm and 0.39 mm respectively, and the maximum distances between arcs c and d and the axis are 2.27 mm and 0.40 mm respectively, so that in the same cross-section of the pyramid part, the maximum distance from the first conical surface to the axis is always smaller than the maximum distance from the second conical surface to the axis, so that during the installation of the screw body, the second conical surface contacts the bottom hole of the workpiece preferentially.

[0009] The utility model is further configured that the positioning portion is provided with a thread groove matching the threaded portion.

[0010] By adopting the above technical solution, a transition structure similar to the top of a tap is adopted between the thread groove and the threaded portion to improve the tapping efficiency.

[0011] The utility model is further configured that a support ring is provided at the bottom of the nut portion, and a receiving groove is formed between the threaded portion and the support ring.

[0012] By adopting the above technical solution, during the installation process of the screw body, the bottom hole surface of the workpiece will be deformed and a bump will be formed. The receiving groove of the nut part is used to accommodate the bump, so that the support ring can abut against the surface of the workpiece, with a strong locking effect.

[0013] The utility model is further configured that the nut portion is provided with a hexagonal head for an externally connected spanner.

[0014] By adopting the above technical solution, the nut part has an anti-theft effect through the hexagonal head, and the top surface of the hexagonal head is flat, which is used to knock the nut part when positioning the screw body. The overall structural design is reasonable and easy to process and produce.

[0015] The utility model is further configured such that the centering portion is in a cone shape as a whole.

[0016] By adopting the above technical solution, the centering portion is in a stable conical shape, and can be used to drill a hole before drilling a bottom hole in a workpiece before installing the screw body.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] When striking the nut and expanding the hole, only the second conical surface abuts against the hole wall of the bottom hole, reducing the contact area and resistance during hole expansion. The pneumatic / electric screwdriver rotates in the bottom hole through the positioning part to complete the hole expansion, and the threaded part self-taps the threads until they are locked, thereby achieving quick installation and saving effort during installation.

[0019] The embodiments of the utility model are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

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

[0022] Figure 3 For the utility model Figure 1 Sectional view of the A direction view;

[0023] Figure 4 For the utility model Figure 2 Sectional view of the B direction view;

[0024] Figure 5 It is a top view of the utility model;

[0025] Wherein: 1-screw body, 2-nut part, 3-threaded part, 4-positioning part, 5-pyramidal part, 6-centering part, 10-axis line, 11-side edge line, 12-first conical surface, 13-second conical surface, 14-arc a, 15-arc b, 16-arc c, 17-arc d, 18-thread groove, 21-support ring, 22-accommodating groove, 23-hexagonal head; DETAILED DESCRIPTION

[0026] like Figure 1 , 2 As shown, the present embodiment provides a quick-install flow drill screw, comprising a screw body 1, wherein the screw body 1 is provided with a nut portion 2, a threaded portion 3, a positioning portion 4, a pyramidal portion 5 and a centering portion 6 in sequence from top to bottom along the axis 10 of the screw body 1, wherein the cross section of the positioning portion 4 is approximately an arc triangle, and the cross section of the pyramidal portion 5 is a similar figure to the cross section of the positioning portion 4, the pyramidal portion 5 is provided with side ridges 11 distributed in a circular pattern, and a first conical surface 12 and a second conical surface 13 are distributed at intervals through the side ridges 11, and in the same cross section of the pyramidal portion 5, the maximum distance from the first conical surface 12 to the axis 10 is smaller than the maximum distance from the second conical surface 13 to the axis 10.

[0027] Combination Figure 4As shown, in this embodiment, the pyramid portion 5 is provided with six groups of side ridges 11, and three groups of first conical surfaces 12 and second conical surfaces 13 are distributed at intervals through the side ridges 11, the side ridges 11 are inclined to the axis 10, and the angle a between the side ridges 11 and the axis 10 is 10° to 15°, preferably 12.1°, the first conical surface 12 is located at the upper and lower ends of the side ridges 11 and is respectively provided with arcs a14 and arcs b15, the arc length of the arc a14 is greater than the arc length of the arc b15, the second conical surface 13 is provided with arcs c16 and arc d17 tangent to the arcs a14 and b15, the arc length of the arc c16 is greater than The arc length of arc d17, the cross-section of the positioning portion 4 is an approximate arc triangle composed of arc a14 and arc c16, wherein the maximum distances between arc a14 and arc b15 and the axis 10 are 2.21 mm and 0.39 mm, respectively, and the maximum distances between arc c16 and arc d17 and the axis 10 are 2.27 mm and 0.40 mm, respectively. Therefore, in the same cross-section of the pyramid portion 5, the maximum distance from the first conical surface 12 to the axis 10 is always smaller than the maximum distance from the second conical surface 13 to the axis 10, so that during the installation of the screw body 1, the second conical surface 13 preferentially contacts the bottom hole of the workpiece.

[0028] In this embodiment, the positioning portion 4 is provided with a thread groove 18 matching the threaded portion 3 , and a transition structure similar to the top of a tap is adopted between the thread groove 18 and the threaded portion 3 to improve the tapping efficiency.

[0029] In this embodiment, a support ring 21 is provided at the bottom of the nut portion 2, and a receiving groove 22 is formed between the threaded portion 3 and the support ring 21. During the installation process of the screw body 1, the bottom hole surface of the workpiece will be deformed and a protrusion will be formed. The receiving groove 22 of the nut portion 2 is used to accommodate the protrusion, so that the support ring 21 can abut against the surface of the workpiece, which has a strong locking effect.

[0030] Combination Figure 5 As shown, in this embodiment, the nut part 2 is provided with a hexagonal head 23 for an external wrench. The nut part 2 has an anti-theft effect through the hexagonal head 23, and the top surface of the hexagonal head 23 is a plane, which is used to knock the nut part 2 when positioning the screw body 1. The overall structural design is reasonable and easy to process and produce.

[0031] Combination Figure 3 As shown, in this embodiment, the centering portion 6 is in a cone shape as a whole. The centering portion 6 is in a stable cone shape and can be used to drill a hole before drilling a bottom hole in a workpiece before installing the screw body 1.

[0032] The working principle of the utility model is as follows: the screw head of the screw body 1 adopts a pyramidal portion 5 with a cross section that is approximately an arc triangle, thereby replacing a traditional conical head. During the installation process, the screw body 1 is inserted into the bottom hole of the workpiece through the pyramidal portion 5. When the nut portion 2 is struck and the hole is expanded, only the second conical surface 13 abuts against the hole wall of the bottom hole, thereby reducing the contact area during expansion and reducing the resistance during expansion. The pneumatic / electric screwdriver rotates in the bottom hole through the positioning portion 4 to complete the expansion, and the threaded portion 3 self-taps the thread until it is locked, thereby achieving quick installation and saving more effort during installation.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A quick-install flow drill screw, comprising a screw body (1), characterized in that: The screw body (1) is provided with a nut portion (2), a threaded portion (3), a positioning portion (4), a pyramid portion (5) and a centering portion (6) in order from top to bottom along the axis (10) of the screw body (1); the cross section of the positioning portion (4) is approximately an arc triangle, and the cross section of the pyramid portion (5) is similar to the cross section of the positioning portion (4); the pyramid portion (5) is provided with a circumferentially distributed side edge line (11), and a first conical surface (12) and a second conical surface (13) are distributed at intervals through the side edge line (11); in the same cross section of the pyramid portion (5), the maximum distance from the first conical surface (12) to the axis (10) is smaller than the maximum distance from the second conical surface (13) to the axis (10).

2. A quick-install flow drill screw according to claim 1, characterized in that: The pyramid portion (5) is provided with six groups of side ridges (11), and three groups of the first conical surfaces (12) and the second conical surfaces (13) are distributed at intervals through the side ridges (11); the side ridges (11) are inclined to the axis (10), and an angle a between the side ridges (11) and the axis (10) is 10° to 15°.

3. The quick-install flow drill screw according to claim 2, characterized in that: The first conical surface (12) is provided with an arc a (14) and an arc b (15) at the upper and lower ends of the side edge line (11), respectively, and the arc a (14) has a greater arc length than the arc b (15); the second conical surface (13) is provided with an arc c (16) and an arc d (17) tangent to the arc a (14) and the arc b (15), and the arc c (16) has a greater arc length than the arc d (17); and the cross section of the positioning portion (4) is an approximate arc triangle formed by the arc a (14) and the arc c (16).

4. The quick-install flow drill screw according to claim 3, characterized in that: The positioning portion (4) is provided with a thread groove (18) matching the threaded portion (3).

5. The quick-install flow drill screw according to claim 1, characterized in that: A supporting ring (21) is provided at the bottom of the nut portion (2), and a receiving groove (22) is formed between the threaded portion (3) and the supporting ring (21).

6. The quick-install flow drill screw according to claim 1, characterized in that: The nut portion (2) is provided with a hexagonal head (23) for an externally connected spanner.

7. The quick-install flow drill screw according to claim 1, characterized in that: The centering portion (6) is in a cone shape as a whole.

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