Self drilling screw applied to flexible waterproof coiled material roof

Abstract

The utility model provides a self drilling screw applied to a flexible waterproof coiled material roof, and belongs to the technical field of screws. The self-drilling screw applied to the flexible waterproof coiled material roof comprises a self-sharpening drill tail, a reverse thread section and a rotating head end, and a plurality of spiral cutting grooves are formed in the self-sharpening drill tail. The self-sharpening drill tail, the reverse thread section and the rotating head end are arranged, the self-sharpening drill tail, the reverse thread section and the rotating head end are integrally arranged, the reverse thread section can effectively prevent the screw from loosening after the screw is tapped into a steel plate, and the umbrella-shaped threads arranged on the reverse thread section are matched with the smaller self-sharpening drill tail, so that the drawing force can be greatly improved; according to the self-drilling screw, by arranging the backing ring and the anti-retreating piece, after the self-drilling screw is drilled into a roof structure, the rotary anti-retreating piece is clamped with the backing ring, so that the clamping block and the clamping groove form acting force and counter-acting force which are arranged up and down, then positive counter-acting force is formed between the internal thread of the anti-retreating ring and the external thread of the rotary head end, and the situation that the self-drilling screw is loosened is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of screws, in particular to a drill tail screw applied to a flexible waterproof roll roof. BACKGROUND

[0002] The conventional drill tail screw used in the flexible waterproof roll roof cannot meet the purpose of improving the pull-out force and preventing loosening in the roof fastening connection because it adopts the conventional standard thread and the design of the drill tail, so when the roof encounters a typhoon, the pull-out force of the drill tail screw is insufficient, causing the screw fixed on the roof profiled steel sheet to be pulled out by the typhoon, and thus the waterproof roll of the entire roof is blown away. Therefore, we propose a drill tail screw applied to a flexible waterproof roll roof. CONTENT OF THE UTILITY MODEL

[0003] In order to make up for the above shortcomings, the present application provides a drill tail screw applied to a flexible waterproof roll roof, aiming to improve the problem of insufficient pull-out force of the conventional screw.

[0004] The present application provides a drill tail screw applied to a flexible waterproof roll roof, which comprises a self-sharpening drill tail, a reverse thread segment and a rotating head end.

[0005] A plurality of spiral grooves are formed on the self-sharpening drill tail, the reverse thread segment is integrally connected with the self-sharpening drill tail, the umbrella-shaped tooth pattern matched with the self-sharpening drill tail is arranged on the reverse thread segment, the rotating head end is integrally connected with the reverse thread segment, and a quincunx groove is formed on the top of the rotating head end.

[0006] In a specific embodiment, a grommet is sleeved on the reverse thread segment, a retreat prevention piece is connected on the outer wall of the rotating head end, and the retreat prevention piece is arranged in clamping connection with the grommet.

[0007] In a specific embodiment, the retreat prevention piece comprises a retreat prevention ring, a clamping piece is fixedly connected to the outer wall of the retreat prevention ring, the retreat prevention ring is threadedly sleeved on the rotating head end, and the clamping piece is arranged in clamping connection with the top of the grommet.

[0008] In a specific embodiment, an external thread is formed on the outer wall of the rotating head end, an internal thread is formed on the inner wall of the retreat prevention ring, and the external thread is matched with the internal thread.

[0009] In a specific embodiment, the clamping piece comprises a fixed ring fixedly sleeved on the outer wall of the retreat prevention ring, a plurality of clamping blocks are fixedly connected to the bottom of the fixed ring, and the plurality of clamping blocks are arranged in clamping connection with the top of the grommet.

[0010] In a specific implementation, the grommet top is provided with a plurality of clamping grooves, and a plurality of clamping blocks are respectively inserted into the clamping grooves, and one end of the clamping block abuts against one end of the side wall of the clamping groove.

[0011] In a specific implementation, the clamping block is arranged in an inclined manner, and the inclined direction is opposite to the rotating direction of the anti-back-off ring.

[0012] In a specific implementation, the clamping block is arranged in an elastic manner.

[0013] Advantages of the present application: by arranging the self-sharpening drill tail, the reverse thread segment and the rotating head end, the self-sharpening drill tail is integrally arranged with the reverse thread segment and the rotating head end, the reverse thread segment can effectively prevent the screw from loosening after being screwed into the steel plate, and the umbrella-shaped thread on the reverse thread segment cooperates with the smaller self-sharpening drill tail to greatly improve the pulling force, by arranging the grommet and the anti-back-off piece, after the drill tail screw of the present application is screwed into the roof structure, the rotating anti-back-off piece is clamped with the grommet, so that the clamping block and the clamping groove form an upward and downward arranged force and a reaction force, and then the positive and negative forces are formed between the inner thread of the anti-back-off ring and the outer thread of the rotating head end, so as to prevent the drill tail screw from loosening. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0015] Figure 1 is a main structure schematic diagram of the drill tail screw applied to the flexible waterproof roll material roof provided by the embodiments of the present application;

[0016] Figure 2 is a front view partial sectional structure schematic diagram of the drill tail screw applied to the flexible waterproof roll material roof provided by the embodiments of the present application;

[0017] Figure 3 is a top view structure schematic diagram of the drill tail screw applied to the flexible waterproof roll material roof provided by the embodiments of the present application;

[0018] Figure 4 is a grommet top view structure schematic diagram of the drill tail screw applied to the flexible waterproof roll material roof provided by the embodiments of the present application;

[0019] Figure 5 is Figure 1 is a local enlarged view of A in FIG. 8;

[0020] Figure 6 for Figure 2 A magnified view of a section at point B.

[0021] In the diagram: 10 - self-sharpening drill tail; 110 - spiral groove; 20 - reverse thread section; 30 - rotating head end; 310 - plum blossom groove; 40 - washer ring; 410 - slot; 50 - anti-retraction component; 510 - anti-retraction ring; 520 - snap-fit ​​component; 5210 - fixing ring; 5220 - snap-fit ​​block. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0023] Please see Figures 1-6 This application provides a self-sharpening screw for use on flexible waterproof membrane roofing, including a self-sharpening drill bit 10, a reverse thread section 20, and a rotating head end 30. The self-sharpening drill bit 10 has several spiral grooves 110. The reverse thread section 20 is integrally connected to the self-sharpening drill bit 10 and has umbrella-shaped threads that mate with the self-sharpening drill bit 10. The rotating head end 30 is integrally connected to the reverse thread section 20 and has a perforated groove 310 at the top. Specifically, the self-sharpening drill bit 10 is designed with a small diameter. The small-diameter self-sharpening drill bit 10 drills a smaller hole when it enters the steel plate, and its reverse thread engagement with the reverse thread section 20 effectively increases the pull-out force between the screw and the steel plate, preventing the screw from loosening. The perforated groove 310 at the top of the rotating head end 30 is adapted to a screwdriver so that the rotating head end 30 can be rotated through the screwdriver part of the drilling machine.

[0024] See Figure 2 A washer 40 is fitted onto the reverse thread section 20, and an anti-retraction component 50 is connected to the outer wall of the rotating head end 30. The anti-retraction component 50 is snapped into the washer 40. When installed, the washer 40 is used in conjunction with the self-drilling screw of this application. The rotating head end 30 presses on the washer 40, which can improve the sealing between the self-drilling screw and the drill hole. At the same time, the washer 40 and the rotating head end 30 form positive and negative forces to improve the fit between the reverse thread section 20 and the drill hole and prevent the self-drilling screw from loosening.

[0025] See Figure 2 and 6The anti-back-off piece 50 comprises an anti-back-off ring 510, the outer wall of the anti-back-off ring 510 is fixedly connected with a clamping piece 520, the anti-back-off ring 510 is threadedly sleeved on the rotary head end 30, the clamping piece 520 is clamped on the top of the grommet 40, an external thread is formed on the outer wall of the rotary head end 30, an internal thread is formed on the inner wall of the anti-back-off ring 510, the external thread is matched with the internal thread, in the specific arrangement, the top of the outer wall of the anti-back-off ring 510 can be arranged in a regular polygonal shape, and the lower part thereof is arranged in a ring shape, so as to facilitate the rotation of the anti-back-off ring 510 by a wrench, the anti-back-off ring 510 is rotatably sleeved on the rotary head end 30, the anti-back-off ring 510 is clamped with the grommet 40 by rotating the anti-back-off ring 510, the anti-back-off ring 510 is prevented from loosening, and the resistance between the internal thread of the anti-back-off ring 510 and the external thread of the rotary head end 30 is increased, so as to prevent the rotary head end 30 from loosening due to external force.

[0026] Referring to Figure 1 , 4 and 5, the clamping piece 520 comprises a fixed ring 5210 fixedly sleeved on the outer wall of the anti-back-off ring 510, a plurality of clamping blocks 5220 are fixedly connected to the bottom of the fixed ring 5210, the plurality of clamping blocks 5220 are clamped on the top of the grommet 40, a plurality of clamping grooves 410 are formed on the top of the grommet 40, the plurality of clamping blocks 5220 are respectively inserted into the plurality of clamping grooves 410, one end of the clamping block 5220 abuts against one end of the side wall of the clamping groove 410, the clamping block 5220 is arranged in an inclined manner, and the inclined direction thereof is opposite to the rotating direction of the anti-back-off ring 510, the clamping block 5220 is arranged in an elastic manner, and it needs to be noted that the clamping block 5220 can be elastically deformed, so that when the anti-back-off ring 510 is rotated, the anti-back-off ring 510 moves downward on the rotary head end 30, the clamping block 5220 contacts the top of the grommet 40, and the clamping block 5220 is switched in the plurality of clamping grooves 410, so that the clamping groove 410 presses the clamping block 5220, thereby forming a normal and reverse force between the clamping block 5220 and the clamping groove 410, so as to increase the normal and reverse force between the anti-back-off ring 510 and the rotary head end 30, and prevent the rotary head end 30 from loosening.

[0027] In use, when the drill tail screw is connected with the flexible waterproof roll roof structure, the drill tail screw is driven by a drill to penetrate into the roof structure, and before penetration, the grommet 40 is sleeved outside the reverse thread segment 20, thereby the self-sharpening drill tail 10 cooperates with the reverse thread segment 20 to penetrate into the roof structure, and the rotary head end 30 is pressed on the grommet 40, then the anti-back-off ring 510 is rotated by a wrench, the anti-back-off ring 510 is rotated on the rotary head end 30, the anti-back-off ring 510 drives the plurality of clamping blocks 5220 to move downward through the fixed ring 5210, the clamping block 5220 contacts the top of the grommet 40, and the clamping block 5220 is frequently switched in the plurality of clamping grooves 410, so that the clamping block 5220 is clamped into the clamping groove 410.

[0028] It should be noted that the specific model and specifications of the self-sharpening drill tail 10, the reverse threaded section 20 and the rotating head end 30 are determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the art, so it is not necessary to describe in detail.

[0029] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A lag screw for use in a flexible waterproofing membrane roof, characterised in that, Comprising The self-sharpening drill tail (10) is provided with a plurality of spiral grooves (110); The reverse threaded section (20) is integrally connected with the self-sharpening drill tail (10), and is provided with an umbrella-shaped tooth matching the self-sharpening drill tail (10); The rotating head end (30) is integrally connected with the reverse threaded section (20), and is provided with a keyway (310) at the top.

2. A lag screw for use in a flexible waterproofing membrane roof according to claim 1 wherein, The reverse threaded section (20) is provided with a spacer ring (40), and the rotating head end (30) is provided with a retreat prevention piece (50) connected to the outer wall.

3. A lag screw for use in a flexible waterproofing membrane roof according to claim 2, wherein, The retreat prevention piece (50) includes a retreat prevention ring (510) fixedly connected with a clamping piece (520) on the outer wall, and the retreat prevention ring (510) is threadedly connected to the rotating head end (30), and the clamping piece (520) is clamped to the top of the spacer ring (40).

4. A lag screw for use in a flexible waterproofing membrane roof according to claim 3, wherein, The outer wall of the rotating head end (30) is provided with external threads, and the inner wall of the retreat prevention ring (510) is provided with internal threads.

5. A lag screw for use in a flexible waterproofing membrane roof according to claim 3, wherein, The clamping piece (520) includes a fixed ring (5210) fixedly connected to the outer wall of the retreat prevention ring (510), and a plurality of clamping blocks (5220) fixedly connected to the bottom of the fixed ring (5210).

6. A lag screw for use in a flexible waterproofing membrane roof according to claim 5 wherein, The top of the spacer ring (40) is provided with a plurality of clamping grooves (410), and a plurality of clamping blocks (5220) are inserted into the clamping grooves (410), respectively.

7. A lag screw for use in a flexible waterproofing membrane roof according to claim 5 wherein, One end of the clamping block (5220) abuts against one end of the clamping groove (410).

8. A lag screw for use in a flexible waterproofing membrane roof according to claim 5, wherein, The clamping block (5220) is inclined, and the inclination direction is opposite to the rotation direction of the retreat prevention ring (510). The clamping block (5220) is elastically arranged.

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