Expansion self-tapping screw

Abstract

The utility model discloses an expansion self-tapping screw which comprises an expansion self-tapping screw mechanism. The expansion self-tapping screw mechanism is arranged, the screw main body adopts the self-tapping screw, so that the screw main body can be directly drilled into an installation position to be quickly fixed, the middle process of trepanning is omitted, and after the screw main body is drilled into the installation position, a screwdriver tool is used for screwing a crosshead nut, so that a conical expansion head is driven to move upwards, and the screw main body is screwed into the installation position. In the process that the conical expansion head moves upwards to the top of the inner cavity, the conical expansion head extrudes and pushes out the expansion petals on the side portion of the inner cavity outwards, the expansion petals abut against the inner wall of the mounting hole, the purpose of expansion fixing is achieved, and compared with an integrated structure of a traditional expansion screw and an expansion self-tapping screw mechanism, the assembly procedure can be effectively simplified, and the assembly efficiency is improved. Therefore, the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to expansion screw technical field, concretely is a kind of expansion self-tapping screw. BACKGROUND

[0002] ‌Expansion screw is a kind of special threaded connection, it utilizes wedge inclination to promote expansion to generate friction gripping force, to achieve fixed effect, is widely used in the support structure of fixed building.

[0003] The existing patent application number: 202123403997.X internal fixation screw expansion sleeve, including expansion sleeve main body, the inner cavity of expansion sleeve main body is provided with the perforation that passes through up and down, the perforation is gradually reduced from top to bottom, the outer wall of expansion sleeve main body is spaced apart and is provided with anti-drop line up and down, the outer wall of expansion sleeve main body is spaced apart and is provided with at least 3 openings along the circumference, the lower end of opening extends to the lower end of expansion sleeve main body, expansion sleeve main body is set on the nail rod of internal fixation screw, the upper end of expansion sleeve main body is limited by the screw head of internal fixation screw.

[0004] The above-mentioned patent records the functional structure of expansion screw, in actual application process, need first in the installation position of expansion screw hole, then embed expansion sleeve into hole, again screw is rotated into expansion sleeve to realize installation fixed, expansion screw lacks self-tapping performance in prior art, needs to help it to carry out hole forming by means of drilling equipment to complete installation, can optimize the structure and function of expansion screw, to simplify assembly process and improve installation efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of expansion self-tapping screw to solve the problems raised in the above background.

[0006] To achieve the above object, the utility model adopts the following technical scheme: a kind of expansion self-tapping screw, including expansion self-tapping screw mechanism, the expansion self-tapping screw mechanism includes screw main body, hexagonal nut, inner cavity, expansion petal, thread groove, screw rod, cross head nut and conical expansion head, the screw main body top end is integrally provided with hexagonal nut, the inner cavity is provided in the inner side of screw main body middle lower part, the inner cavity side is integrally provided with expansion petal, expansion petal is located in the surface of screw main body middle lower part, the inner cavity top is provided with thread groove, thread groove is vertically through to the top of hexagonal nut, the screw rod is connected and fixed with cross head nut in thread groove inside, cross head nut is located above hexagonal nut, the screw rod bottom end is connected and fixed with conical expansion head, conical expansion head is located in the inner cavity, the conical expansion head can be in contact with the inner wall of expansion petal.

[0007] Preferably, the screw main body adopts self-tapping screw.

[0008] Preferably, the number of the expansion petals is not less than 2, and all the expansion petals are equidistantly distributed on the side wall of the inner cavity.

[0009] Preferably, the inner wall surface of the expansion flap is designed to be a slope.

[0010] Preferably, the outer surface of the expansion flap is provided with transverse anti-slip grooves.

[0011] Preferably, a embedding groove is provided on the top of the hexagonal nut, the top of the thread groove is connected to the embedding groove, and the cross head nut is received in the embedding groove.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model is provided with an expansion self-tapping screw mechanism. Since the screw body adopts a self-tapping screw, the screw body can be directly drilled into the installation position and quickly fixed, omitting the intermediate process of drilling a hole. After the screw body is drilled into the installation position, a screwdriver tool is used to twist the cross head nut, thereby driving the conical expansion head to move up. In the process of the conical expansion head moving to the top of the inner cavity, the conical expansion head will squeeze and push out the expansion petals on the side of the inner cavity, so that the expansion petals are pressed against the inner wall of the installation hole, thereby achieving the purpose of expansion and fixation. Compared with traditional expansion screws, the integrated structure of the expansion self-tapping screw mechanism can effectively simplify the assembly process, thereby improving installation efficiency.

[0014] The utility model provides an embedding groove on the top of the hexagonal nut, which hides the cross head nut and ensures that the cross head nut does not affect the connection operation of the wrench and the hexagonal nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall front view structure of the utility model;

[0016] Figure 2 This is a schematic front cross-sectional view of the expansion self-tapping screw mechanism of the present utility model;

[0017] Figure 3 For this utility model Figure 2 Schematic diagram of the structure after the middle screw is removed;

[0018] Figure 4 For this utility model Figure 2 Schematic diagram of the expansion state.

[0019] In the figure: expansion self-tapping screw mechanism-1, screw body-11, hexagonal nut-12, inner cavity-13, expansion flap-14, thread groove-15, screw rod-16, cross head nut-17, conical expansion head-18, embedded groove-19. DETAILED DESCRIPTION

[0020] In order to further explain the technical scheme of the utility model, the following will be described in detail through specific embodiments.

[0021] Please refer to Figures 1-4 The utility model provides a kind of expansion self-tapping screw, including expansion self-tapping screw mechanism 1, expansion self-tapping screw mechanism 1 includes screw main body 11, hexagon nut 12, inner cavity 13, expansion petal 14, thread groove 15, screw rod 16, cross head nut 17 and conical expansion head 18, hexagon nut 12 is integrally arranged at screw main body 11 top end, inner cavity 13 is formed in the inner side of screw main body 11 middle lower part, expansion petal 14 is integrally arranged at the side of inner cavity 13, expansion petal 14 is located at the surface of screw main body 11 middle lower part, thread groove 15 is formed at the top of inner cavity 13, thread groove 15 is vertically connected to the top of hexagon nut 12, screw rod 16 is threadedly connected in thread groove 15, cross head nut 17 is fixedly connected at the top end of screw rod 16, cross head nut 17 is located above hexagon nut 12, conical expansion head 18 is fixedly connected at the bottom end of screw rod 16, conical expansion head 18 is located in the inner cavity of inner cavity 13, conical expansion head 18 can be in contact with the inner wall of expansion petal 14, expansion petal 14 is extruded and pushed out by conical expansion head 18, so that expansion petal 14 is tightly contacted with the inner wall of mounting hole, and the purpose of expansion fixation is achieved.

[0022] Further explanation, screw main body 11 uses self-tapping screw, so that screw main body 11 can be directly drilled into installation position and quickly fixed, and the intermediate process of hole opening is omitted.

[0023] Further explanation, the number of expansion petal 14 is not less than 2, and all expansion petals 14 are equidistantly arranged on the side wall of inner cavity 13, so that screw main body 11 can be tightly locked in the inner wall of mounting hole through multiple expansion petals 14, and the installation stability is ensured.

[0024] Further explanation, the inner wall surface of expansion petal 14 is designed as an inclined surface, so that conical expansion head 18 can cooperate with the inclined surface of expansion petal 14 inner wall, and expansion petal 14 can be better extruded and pushed out.

[0025] Further explanation, the outer surface of expansion petal 14 is provided with transverse anti-skid lines, to further improve the friction fastening performance of expansion petal 14 and the inner wall of mounting hole.

[0026] Further explanation, hexagon nut 12 top is provided with embedding groove 19, thread groove 15 top end is communicated with embedding groove 19, cross head nut 17 is received into the inside of embedding groove 19, embedding groove 19 hides cross head nut 17, to ensure that cross head nut 17 does not affect the connection operation of wrench and hexagon nut 12.

[0027] Working principle is as follows:

[0028] First, when the screw body 11 is installed, the hexagonal nut 12 is screwed using a wrench tool, so that the screw body 11 is driven to drill into the installation position. Since the screw body 11 is a self-tapping screw, the screw body 11 can be directly drilled into the installation position for quick fixing, and the intermediate process of hole opening is omitted.

[0029] Second, after the screw body 11 drills into the installation position, the cross head nut 17 is screwed using a screwdriver tool, so that the screw rod 16 is rotated and moved upward along the threaded groove 15, thereby driving the conical expansion head 18 to move upward. During the process of moving the conical expansion head 18 to the top of the inner cavity 13, the conical expansion head 18 will extrude and push out the expansion petals 14 on the side of the inner cavity 13, so that the expansion petals 14 are tightly attached to the inner wall of the installation hole, achieving the purpose of expansion fixation. Compared with the traditional expansion screw, the integrated structure of the expansion self-tapping screw mechanism 1 can effectively simplify the assembly process, thereby improving the installation efficiency.

[0030] Third, by providing the embedding groove 19 on the top of the hexagonal nut 12, the embedding groove 19 hides the cross head nut 17, ensuring that the cross head nut 17 does not affect the connection operation of the wrench and the hexagonal nut 12.

[0031] The above is only a preferred example of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An expansion self-tapping screw, characterized in that: The invention comprises an expansion self-tapping screw mechanism (1), wherein the expansion self-tapping screw mechanism (1) comprises a screw body (11), a hexagonal nut (12), an inner cavity (13), an expansion flap (14), a thread groove (15), a screw rod (16), a cross head nut (17) and a conical expansion head (18), wherein the top of the screw body (11) is integrally provided with a hexagonal nut (12), the inner side of the middle and lower part of the screw body (11) is provided with an inner cavity (13), the side of the inner cavity (13) is integrally provided with an expansion flap (14), and the expansion flap (14) is located in the screw body (11). On the lower surface, a thread groove (15) is provided at the top of the inner cavity (13), and the thread groove (15) is longitudinally extended to the top of the hexagonal nut (12). A screw rod (16) is connected to the inner thread of the thread groove (15), and a cross head nut (17) is connected and fixed to the top of the screw rod (16). The cross head nut (17) is located above the hexagonal nut (12), and a conical expansion head (18) is connected and fixed to the bottom end of the screw rod (16). The conical expansion head (18) is located inside the inner cavity (13), and the conical expansion head (18) can interfere with the inner wall of the expansion flap (14).

2. The expansion self-tapping screw according to claim 1, characterized in that: The screw body (11) is a self-tapping screw.

3. The expansion self-tapping screw according to claim 1, characterized in that: The number of the expansion flaps (14) is no less than 2, and all the expansion flaps (14) are equidistantly distributed on the side wall of the inner cavity (13).

4. The expansion self-tapping screw according to claim 1, characterized in that: The inner wall surface of the expansion flap (14) is designed as a slope.

5. The expansion self-tapping screw according to claim 1, characterized in that: The outer surface of the expansion flap (14) is provided with transverse anti-slip grooves.

6. The expansion self-tapping screw according to claim 1, characterized in that: The top of the hexagonal nut (12) is provided with an embedding groove (19), the top of the threaded groove (15) is connected to the embedding groove (19), and the cross head nut (17) is received in the embedding groove (19).

Images