Reinforced expansion bolt

Abstract

The utility model discloses a reinforced expansion bolt which comprises a screw rod, a double-end expansion sleeve, an expansion nut and a fixing nut, one end of the screw rod is provided with threads, the other end of the screw rod is provided with an expansion conical head, the double-end expansion sleeve is arranged in the middle of the screw rod in a sleeved mode, and the expansion nut and the fixing nut are screwed at the threaded end of the screw rod. The expansion nut is located between the fixing nut and the double-end expansion sleeve and used for forcing the two ends of the double-end expansion sleeve to be embedded into a wall. In the process of screwing the expansion nut for fixing, one end of the double-end expansion sleeve is expanded by the expansion conical head at one end of the screw rod, and the other end of the double-end expansion sleeve is expanded by inserting the conical flaring part, so that the contact part of the double-end expansion sleeve and a wall body is increased after the expansion bolt is fixed; and after the double-end expansion sleeve is embedded into the wall body, the limiting convex edge on the outer wall of the double-end expansion sleeve is embedded into the wall body, so that the overall fixing strength of the bolt is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion bolts, in particular to a reinforced expansion bolt. Background Art

[0002] When the existing expansion bolts are used, the expansion bolts are first driven completely into the wall, and then the internal expansion sleeve is expanded by tightening the nut, so that the tail of the expansion sleeve is embedded in the hole wall to achieve a tightening effect. However, after the expansion bolts are tightened, only the tail of the expansion sleeve is embedded in the wall, and the contact portion between the expansion bolts and the wall is small. After long-term use, the expansion bolts are easy to loosen from the wall opening, causing safety hazards. Therefore, a reinforced expansion bolt is designed to solve the above problems. Utility Model Content

[0003] In view of the shortcomings of existing expansion bolts, the purpose of the utility model is to provide a reinforced expansion bolt, which has the advantages of increasing the contact area with the wall opening and improving the fixing strength.

[0004] To achieve the above purpose, the utility model adopts a technical solution: a reinforced expansion bolt, including a screw, a double-headed expansion sleeve, an expansion nut and a fixing nut, wherein one end of the screw has a thread, and the other end of the screw has an expansion cone head, the double-headed expansion sleeve is arranged in the middle of the screw, the expansion nut and the fixing nut are screwed together at the threaded end of the screw, the expansion nut is located between the fixing nut and the double-headed expansion sleeve, and the expansion nut is used to force the two ends of the double-headed expansion sleeve to fit with the wall;

[0005] Preferably, the expansion nut has a conical flared portion and an outer hexagonal portion, one side of the expansion nut is the outer hexagonal portion, and the other side of the expansion nut is the conical flared portion, and the conical flared portion is inserted between the double-headed expansion sleeve and the screw;

[0006] Preferably, the double-headed expansion sleeve is a hollow cylinder formed of metal, and the outer walls at both ends of the hollow cylinder are also provided with limiting convex edges, and both ends of the hollow cylinder are also provided with a plurality of deformation grooves arranged at equal angles; during the process of screwing the expansion nut, one end of the double-headed expansion sleeve is expanded by the expansion cone head at one end of the screw, and the other end of the double-headed expansion sleeve is inserted and expanded by the conical flaring part, so that after the expansion bolt is fixed, the contact part between the double-headed expansion sleeve and the wall is increased, and after the double-headed expansion sleeve is embedded in the wall, the limiting convex edge of the outer wall of the double-headed expansion sleeve is embedded into the wall, so that the overall fixing strength of the bolt is greatly improved;

[0007] Preferably, a gasket is provided between the expansion nut and the fixing nut to prevent loosening;

[0008] The beneficial effects of the utility model are as follows: 1. During the process of screwing the expansion nut for fixing, one end of the double-headed expansion sleeve is expanded by the expansion cone head at one end of the screw, and the other end of the double-headed expansion sleeve is expanded by the conical expansion portion inserted, thereby increasing the contact portion between the double-headed expansion sleeve and the wall after the expansion bolt is fixed. 2. After the double-headed expansion sleeve is embedded in the wall, the outer wall limiting convex edge of the double-headed expansion sleeve is embedded in the wall, so that the overall fixing strength of the bolt is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a cross-sectional structural view of the utility model;

[0010] Figure 2 This is a cross-sectional structural view of the double-head expansion sleeve of the utility model in the expanded state;

[0011] Figure 3 This is a three-dimensional view of the double-head expansion sleeve of the utility model;

[0012] Figure 4 This is a three-dimensional view of the expansion nut of the utility model. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0014] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0015] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided with", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figures 1 to 4 , the utility model embodiment includes:

[0017] A reinforced expansion bolt, comprising a screw rod 1, a double-headed expansion sleeve 2, an expansion nut 3 and a fixing nut 4, wherein one end of the screw rod 1 has a thread 11, and the other end of the screw rod 1 has an expansion cone head 12, the double-headed expansion sleeve 2 is sleeved on the middle of the screw rod 1, the expansion nut 3 and the fixing nut 4 are screwed on the end of the thread 11 of the screw rod 1, the expansion nut 3 is located between the fixing nut 4 and the double-headed expansion sleeve 2, and the expansion nut 3 is used to force the two ends of the double-headed expansion sleeve 2 to fit with the wall;

[0018] The expansion nut 3 has a conical flared portion 31 and an outer hexagonal portion 32. One side of the expansion nut 3 is the outer hexagonal portion 32, and the other side of the expansion nut 3 is the conical flared portion 31. The conical flared portion 31 is inserted between the double-head expansion sleeve 2 and the screw 1.

[0019] The double-headed expansion sleeve 2 is a hollow cylinder formed of metal, and the outer walls at both ends of the hollow cylinder also have limiting convex edges 21, and both ends of the hollow cylinder also have multiple deformation grooves 22 set at equal angles; during the process of screwing the expansion nut 3, one end of the double-headed expansion sleeve 2 is expanded by the expansion cone head 12 at one end of the screw rod 1, and the other end of the double-headed expansion sleeve 2 is inserted and expanded by the conical expansion portion 31, so that the contact part between the double-headed expansion sleeve 2 and the wall is increased after the expansion bolt is fixed, and after the double-headed expansion sleeve 2 is embedded in the wall, the limiting convex edge 21 of the outer wall of the double-headed expansion sleeve 2 is embedded into the wall, so that the overall fixing strength of the bolt is greatly improved;

[0020] A gasket is provided between the expansion nut 3 and the fixing nut 4 to prevent loosening;

[0021] Through the above settings, in the actual working process, its specific working principle is as follows:

[0022] After the expansion bolt is placed in the hole in the wall, the expansion nut 3 is first screwed. During the screwing process, one end of the double-headed expansion sleeve 2 is expanded by the expansion cone head 12 at one end of the screw rod 1, and the other end of the double-headed expansion sleeve 2 is inserted and expanded by the conical expansion portion 31, so that the contact portion between the double-headed expansion sleeve 2 and the wall is increased after the expansion bolt is fixed, and after the double-headed expansion sleeve 2 is embedded in the wall, the outer wall limiting convex edge 21 of the double-headed expansion sleeve 2 is embedded in the wall, so that the overall fixing strength of the bolt is greatly improved;

[0023] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reinforced expansion bolt, characterized in that: It includes a screw rod, a double-headed expansion sleeve, an expansion nut and a fixing nut. One end of the screw rod has a thread, and the other end of the screw rod has an expansion cone head. The double-headed expansion sleeve is arranged in the middle of the screw rod. The expansion nut and the fixing nut are screwed together at the threaded end of the screw rod. The expansion nut is located between the fixing nut and the double-headed expansion sleeve. The expansion nut is used to force the two ends of the double-headed expansion sleeve to engage with the wall.

2. A reinforced expansion bolt according to claim 1, characterized in that: The expansion nut has a conical flared portion and an outer hexagonal portion, one side of the expansion nut is the outer hexagonal portion, and the other side of the expansion nut is the conical flared portion, and the conical flared portion is inserted between the double-head expansion sleeve and the screw.

3. A reinforced expansion bolt according to claim 1, characterized in that: The double-head expansion sleeve is a hollow cylinder formed of metal. The outer walls at both ends of the hollow cylinder are also provided with limiting convex edges, and both ends of the hollow cylinder are also provided with a plurality of deformation grooves arranged at equal angles.

4. A reinforced expansion bolt according to claim 1, characterized in that: A gasket is provided between the expansion nut and the fixing nut to prevent loosening.

Images