Expansion bolt structure

Abstract

The utility model discloses an expansion bolt structure which structurally comprises a screw rod and an expansion sleeve sleeved on the screw rod, the screw rod comprises a threaded section and a smooth section, a nut is sleeved outside the threaded section, an expansion head is formed at one end of the smooth section deviating from the threaded section, and the diameter of the expansion sleeve is smaller than the maximum diameter of the expansion head. The expansion sleeve is provided with a first matching section and a second matching section from outside to inside. When the expansion bolt is installed, stable expansion force is provided for the expansion bolt through the first matching section and the second matching section, so that the expansion bolt can bear high tension and is not prone to displacement, and use stability of the expansion bolt is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, and more particularly to an expansion bolt structure. Background Art

[0002] Expansion bolts primarily consist of a screw, an expansion sleeve, and a nut. The nut moves along the screw as the screw rotates, compressing the expansion sleeve. Once compressed, the sleeve expands, securing the bolt in place. Existing expansion bolts suffer from insufficient expansion force and are prone to displacement, resulting in poor stability. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an expansion bolt structure to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: an expansion bolt structure, comprising a screw and an expansion sleeve sleeve mounted on the screw, the screw comprising a threaded section and a smooth section, and a nut is disposed on the outer sleeve of the threaded section, an expansion head is formed on the end of the smooth section away from the threaded section, the diameter of the expansion sleeve is smaller than the maximum diameter of the expansion head, and the expansion sleeve has a first mating section and a second mating section from the outside to the inside.

[0005] The utility model is further configured as follows: the first matching section includes at least two expansion portions and at least two matching cracks.

[0006] The utility model is further configured as follows: a plurality of protrusions are arranged in an array on the outer peripheral surfaces of the two expansion parts.

[0007] The utility model is further configured as follows: the matching crack is a wave-like structure with wave crests and troughs, the two expansion parts are both provided with anti-slip teeth at the wave crests of the matching crack, and the outer surface of each anti-slip tooth is further formed with a reinforcement part.

[0008] The utility model is further configured as follows: the second matching section is provided with a plurality of matching through grooves, an elastic portion is formed between every two adjacent matching through grooves, and two groups of anti-slip grooves are distributed on the outer surface of each elastic portion, and the two groups of anti-slip grooves are inclined and in opposite directions.

[0009] The utility model is further configured as follows: the outer circumference of the expansion sleeve is located between the first matching section and the second matching section and has an intermediate section; the outer circumference of the intermediate section has a plurality of positioning springs distributed equidistantly and at intervals.

[0010] The utility model is further configured as follows: a fastening washer and a spring washer are further provided between the expansion sleeve and the nut.

[0011] To sum up, the utility model has the following beneficial effects: when the utility model is in the installed state, the first mating section and the second mating section provide a stable expansion force, so that the expansion bolt can withstand a higher tensile force and is not prone to displacement, thereby ensuring the stability of the expansion bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic structural diagram of the screw rod of the utility model.

[0015] Figure numerals: 1. screw; 10. threaded section; 11. smooth section; 12. expansion head; 13. middle section; 14. positioning spring; 2. expansion sleeve; 20. first fitting section; 21. second fitting section; 22. expansion portion; 23. fitting gap; 24. protrusion; 25. anti-slip teeth; 26. reinforcement portion; 27. fitting groove; 28. elastic portion; 29. ​​anti-slip groove; 3. nut; 30. fastening washer; 31. spring washer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-2 As shown, an expansion bolt structure of an embodiment of the present invention includes a screw rod 1 and an expansion sleeve 2 sleeved on the screw rod 1, the screw rod 1 includes a threaded section 10 and a smooth section 11, and a nut 3 is provided on the outer sleeve of the threaded section 10, and an expansion head 12 is formed on the end of the smooth section 11 away from the threaded section 10, the diameter of the expansion sleeve 2 is smaller than the maximum diameter of the expansion head 12, and the expansion sleeve 2 has a first matching section 20 and a second matching section 21 from the outside to the inside.

[0018] During use, when installing the expansion bolt, rotate the nut 3, and the nut 3 pushes the expansion sleeve 2 into the preset hole position. At this time, the first mating section 20 and the second mating section 21 are stretched open due to the action of the expansion head 12 (which has an "inverted cone" structure). At this time, continue to rotate until the nut 3 is tightened to complete the installation of the expansion bolt; in the state of the utility model, the first mating section 20 and the second mating section 21 provide it with a stable expansion force, so that the expansion bolt can withstand higher tension and is not easily displaced, thereby ensuring the stability of the expansion bolt.

[0019] The first fitting section 20 includes at least two expansion portions 22 and at least two fitting gaps 23 .

[0020] During use, when the expansion bolt is installed, the nut 3 is tightened, and the expansion head 12 squeezes the two expansion parts 22, and the cracks 23 cause the two expansion parts 22 to open and expand, so that the outer wall of the expansion sleeve 2 quickly and tightly fits the inner wall of the pre-installed hole, ensuring the fixing effect of the expansion bolt;

[0021] The present invention preferably has two expansion portions 22 and forms two fitting gaps.

[0022] A plurality of protrusions 24 are arranged in an array on the outer circumference of the two expansion portions 22 .

[0023] When in use, when the expansion bolt is installed, each protrusion 24 is squeezed against the inner wall of the pre-installed hole, effectively increasing the friction coefficient between the first expansion portion 22 and the inner wall of the pre-installed hole, thereby preventing the expansion bolt from withdrawing from the pre-installed hole.

[0024] The matching crack 23 is a wavy structure with peaks and troughs. The two expansion parts 22 are both provided with anti-slip teeth 25 at the peaks of the matching crack 23 . The outer surface of each anti-slip tooth 25 is further formed with a reinforcement part 26 .

[0025] When in use, the expansion bolt is installed and the expansion portion 22 is opened. The anti-slip teeth 25 and the reinforcement portion 26 are provided to further increase the friction coefficient between the expansion portion 22 and the pre-installed hole, thereby preventing the expansion bolt from rotating in the pre-installed hole.

[0026] The second mating section 21 is provided with a plurality of mating grooves 27 , with an elastic portion 28 formed between every two adjacent mating grooves 27 . Two groups of anti-slip grooves 29 are distributed on the outer surface of each elastic portion 28 , and the two groups of anti-slip grooves 29 are inclined and in opposite directions.

[0027] During use, when the expansion bolt is installed, the first engaging section 20 is pressed toward the pre-installed hole during the tightening process of the nut 3. At the same time, the elastic portions 28 of the second engaging section 21 contact and press the inner wall of the pre-installed hole, thereby ensuring the installation stability of the expansion bolt.

[0028] When the expansion head 12 moves to the second mating section 21 due to external force, the expansion head 12 causes each elastic part 28 to deform and press the inner wall of the pre-installed hole outward. The anti-slip grooves 29 on the outer surface of each elastic part 28 effectively increase its friction coefficient. The anti-slip grooves 29 are arranged at an angle and the inclination directions of the two groups of anti-slip grooves 29 are opposite, thereby forming a multi-angle and stable anti-slip effect for the elastic part 28.

[0029] The outer circumference of the expansion sleeve 2 includes a middle section 13 between the first matching section 20 and the second matching section 21 . A plurality of positioning springs 14 are equidistantly and spaced apart on the outer circumference of the middle section 13 .

[0030] During use, when the expansion sleeve 2 is inserted into the pre-installed hole, each positioning spring piece 14 is deformed. When the expansion sleeve 2 is in the pre-installed hole, the positioning spring piece 14 presses the inner wall of the pre-installed hole due to its own elastic reciprocating force, which facilitates the pre-positioning of the expansion sleeve 2 during installation.

[0031] When the expansion thread is installed, the outer end of the positioning spring piece 14 is tightly fitted to the inner wall of the pre-installed hole, which has a limiting effect on the axial rotation of the expansion sleeve 2.

[0032] A fastening washer 30 and a spring washer 31 are further provided between the expansion sleeve 2 and the nut 3 .

[0033] During use, the fastening washers 30 and the spring washers 31 are provided during installation to improve the installation stability of the expansion bolts.

[0034] It should also be pointed out that the terms indicated in the present invention, such as "front", "rear", "vertical", "horizontal", etc., which indicate orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0035] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An expansion bolt structure, comprising a screw rod (1) and an expansion sleeve (2) sleeved on the screw rod (1), characterized in that: The screw (1) comprises a threaded section (10) and a smooth section (11), and a nut (3) is provided on the outer sleeve of the threaded section (10); an expansion head (12) is formed on the end of the smooth section (11) facing away from the threaded section (10); the diameter of the expansion sleeve (2) is smaller than the maximum diameter of the expansion head (12); and the expansion sleeve (2) has a first fitting section (20) and a second fitting section (21) from the outside to the inside, respectively.

2. The expansion bolt structure according to claim 1, characterized in that: The first fitting section (20) includes at least two expansion portions (22) and at least two fitting gaps (23).

3. The expansion bolt structure according to claim 2, characterized in that: The outer peripheral surfaces of the two expansion parts (22) are both provided with a plurality of protrusions (24) in an array.

4. The expansion bolt structure according to claim 2, characterized in that: The matching crack (23) is a wavy structure with peaks and troughs. The two expansion parts (22) are both provided with anti-slip teeth (25) at the peaks of the matching crack (23). The outer surface of each anti-slip tooth (25) is also formed with a reinforcement part (26).

5. The expansion bolt structure according to claim 1, characterized in that: The second matching section (21) is provided with a plurality of matching through grooves (27), an elastic portion (28) is formed between every two adjacent matching through grooves (27), and two groups of anti-slip grooves (29) are distributed on the outer surface of each elastic portion (28), and the two groups of anti-slip grooves (29) are both inclined and distributed in opposite directions.

6. The expansion bolt structure according to claim 1, characterized in that: The outer circumference of the expansion sleeve (2) is located between the first matching section (20) and the second matching section (21) and comprises a middle section (13). The outer circumference of the middle section (13) is provided with a plurality of positioning springs (14) which are equidistant and spaced apart.

7. The expansion bolt structure according to claim 6, characterized in that: A fastening washer (30) and a spring washer (31) are also provided between the expansion sleeve (2) and the nut (3).

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