Hexagonal insertion type multi-stage expansion bolt

Abstract

The utility model relates to a hexagonal plug-in multi-stage expansion bolt, and belongs to the technical field of fastener equipment. The hexagonal plug-in multi-stage expansion bolt comprises an expansion sleeve, a locking nut and a core rod, the cross section of the expansion sleeve is of a hexagonal structure; one or more circles of top explosion points are arranged on the outer surface of one end of the expansion sleeve at intervals; the outer surface of the other end of the expansion sleeve is in threaded connection with a locking nut; a core rod is movably arranged in the expansion sleeve; and one end of the core rod extends out of the expansion sleeve. The hexagonal plug-in multi-stage expansion bolt is compact in structure and ingenious in design, solves the problems that an existing expansion bolt is relatively low in locking force and cannot be recycled for use, and meets the requirement for fastening use.

Description

Technical Field

[0001] The utility model relates to a hexagonal insert-type multi-stage expansion bolt, belonging to the technical field of fastener equipment. Background Art

[0002] It is a special threaded connector used to fix pipeline supports / hangers / brackets or equipment on walls, floors, and columns. Existing expansion bolts include a core rod, an expansion sleeve, and a locking nut; the core rod is sleeved with an expansion sleeve; and the core rod at one end of the expansion sleeve is threaded with a locking nut. During assembly, insert the expansion bolt into the assembly hole, tighten the locking nut, so that it drives the core rod to move relative to the expansion sleeve and squeeze the expansion sleeve, so that the expansion sleeve expands and presses against the assembly hole, thereby achieving the purpose of expansion and locking. Although the existing expansion bolts meet the use requirements to a certain extent, they have the following problems:

[0003] First, the existing expansion bolts have relatively few expansion locking points and a relatively low locking force.

[0004] Second: the existing expansion bolts have the problem of not being able to be recycled for a second time.

[0005] Therefore, it is necessary to develop a new expansion bolt to solve the above problems of the existing expansion bolts. Summary of the invention

[0006] The utility model aims to provide a hexagonal insert type multi-stage expansion bolt with compact structure and ingenious design to solve the problems of relatively low locking force and inability to be recycled and used twice in existing expansion bolts.

[0007] The technical solution of the utility model is:

[0008] A hexagonal insert-type multi-stage expansion bolt comprises an expansion sleeve, a locking nut and a core rod; the characteristics are as follows: the cross section of the expansion sleeve is a hexagonal structure; one end of the expansion sleeve is provided with one or more circles of top burst points at intervals on the outer surface; the other end of the expansion sleeve is threadedly connected with a locking nut on the outer surface; the expansion sleeve is provided with a core rod movably disposed inside; one end of the core rod extends to the outside of the expansion sleeve.

[0009] One end of the core rod is provided with a flat cap; the end of the core rod is provided with an extrusion cone surface.

[0010] The circle of top bursting points includes three groups of top bursting points, which are evenly arranged on the outer surface of the expansion sleeve.

[0011] The top bursting point comprises a top bursting piece; the outer surface of the expansion sleeve is provided with a top bursting window; and the top bursting piece is connected inside the top bursting window.

[0012] One end of the bursting plate is bent to form a double-layer structure.

[0013] A reinforcing sheet is fixedly installed inside the double-layer structure of the top bursting sheet.

[0014] The advantages of the utility model are:

[0015] The hexagonal insert-type multi-stage expansion bolt has a compact structure and ingenious design. When working, multiple circles of top burst points are pushed open to complete the locking work. After use, the core rod can be retracted by rotating the locking nut, and the top burst point is reset to complete the recovery work. This solves the problems of relatively low locking force and inability to be recycled for secondary use of existing expansion bolts, and meets the needs of tightening use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model after removing the locking nut;

[0018] Figure 3 This is a schematic diagram of the structure of the expansion sleeve of the utility model;

[0019] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of;

[0020] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at point A;

[0021] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0022] Figure 7 This is a schematic diagram of the utility model before top explosion;

[0023] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0024] Fig. 9 It is a schematic diagram of the structure of the core rod.

[0025] In the figure: 1. expansion sleeve; 2. top burst point; 3. locking nut; 4. core rod; 5. flat head cap; 6. extrusion cone; 7. top burst piece; 8. top burst window; 9. external thread; 10. double-layer structure; 11. reinforcement piece. DETAILED DESCRIPTION

[0026] The hexagonal insert type multi-stage expansion bolt comprises an expansion sleeve 1, a locking nut 3 and a core rod 4 (see the attached manual). Figure 1 ).

[0027] The cross section of the expansion sleeve 1 is a hexagonal structure; the cross section of the expansion sleeve 1 is a hexagonal structure. One end of the expansion sleeve 1 is provided with an external thread 9; one end of the expansion sleeve 1 is threadedly connected with a locking nut 3.

[0028] The purpose of setting the cross section of the expansion sleeve 1 to a hexagonal structure is: one purpose is that the commonly used expansion sleeve 1 is a circular structure and has a thin thickness, so it is very easy to break after tapping its surface. When it is set to a hexagonal structure, the thickness of the turning part will be thickened and this part will bear most of the force, thereby achieving the purpose of strengthening the strength of the expansion sleeve 1. Another purpose is that since any side of the hexagon is a plane, the top burst point 2 can be added on the plane metal plate surface as needed to further enhance the locking ability.

[0029] The outer surface of the other end of the expansion sleeve 1 is provided with one or more circles of top explosion points 2 (see the appendix of the instruction manual). Figure 1 and 7 ). One circle of bursting points 2 includes three groups of bursting points 2, which are evenly arranged on the outer surface of the expansion sleeve 1. The bursting points 2 have the function of expanding and squeezing the assembly hole to tighten when working. After multiple circles (levels) of bursting points 2 are arranged, the locking force can be enhanced, thereby achieving the purpose of solving the problem of relatively low locking force of existing expansion bolts.

[0030] The top bursting point 2 includes a top bursting piece 7; a top bursting window 8 is provided on the outer surface of the expansion sleeve 1; a top bursting piece 7 is connected to the top bursting window 8; one end of the top bursting piece 7 is bent to form a double-layer structure 10. A reinforcing piece 11 is fixed inside the double-layer structure 10 of the top bursting piece 7 (see the attached manual Figure 5 and 8 The purpose of providing the reinforcing sheet 11 is to enhance the overall strength of the middle top bursting sheet 7 of the top bursting point 2 .

[0031] When the core rod 4 squeezes the top bursting piece 7 through the extrusion cone 6 during operation, the top bursting piece 7 will expand outwards after being stressed. When the top bursting piece 7 loses the support of the core rod 4, it will lose its top bursting function and return to the inside of the top bursting window 8 (see the attached manual). Figure 7 and 8 ).

[0032] The outer surface of the other end of the expansion sleeve 1 is threadedly connected with a locking nut 3 ; a core rod 4 is movably arranged inside the expansion sleeve 1 ; one end of the core rod 4 extends to the outside of the expansion sleeve 1 .

[0033] One end of the core rod 4 is provided with a flat cap 5 ; the end of the core rod 4 is provided with an extrusion cone 6 .

[0034] When the hexagonal plug-in multi-stage expansion bolt is working, after the expansion bolt is inserted into the assembly hole, the flat head cap 5 hits the core rod 4, so that the extrusion cone surface 6 on the core rod 4 will sequentially squeeze the top bursting piece 7, so that it will expand outward after being stressed, thereby achieving the purpose of locking. Then tighten the locking nut 3 to squeeze the hole of the assembly hole, which will further achieve the purpose of enhancing the locking force.

[0035] When the expansion bolt needs to be recovered, the locking nut 3 is rotated in the opposite direction to make it move outward relatively and squeeze the core rod 4 to make it move outward together. During the outward movement of the core rod 4, the top bursting piece 7 will gradually lose the support of the core rod 4, and then it will lose the top bursting function and reset. After the top bursting piece 7 is reset, the expansion bolt can be removed, and the recovery work can be completed.

[0036] The hexagonal insert-type multi-stage expansion bolt has a compact structure and ingenious design. When working, multiple circles of top burst points are pushed open to complete the locking work. After use, the core rod can be retracted by rotating the locking nut, and the top burst point is reset to complete the recovery work. This solves the problems of relatively low locking force and inability to be recycled for secondary use of existing expansion bolts, and meets the needs of tightening use.

Claims

1. A hexagonal insert-type multi-stage expansion bolt, comprising an expansion sleeve (1), a locking nut (3) and a core rod (4); characterized in that: The expansion sleeve (1) has a hexagonal cross-section; one end of the expansion sleeve (1) is provided with one or more burst points (2) at intervals on its outer surface; the other end of the expansion sleeve (1) is threadedly connected with a locking nut (3); a core rod (4) is movably provided inside the expansion sleeve (1); one end of the core rod (4) extends to the outside of the expansion sleeve (1).

2. The hexagonal insertable multi-stage expansion bolt according to claim 1, characterized in that: One end of the core rod (4) is provided with a flat cap (5); the end of the core rod (4) is provided with an extrusion cone surface (6).

3. The hexagonal insertable multi-stage expansion bolt according to claim 1, characterized in that: The circle of top bursting points (2) comprises three groups of top bursting points (2), which are evenly arranged on the outer surface of the expansion sleeve (1).

4. The hexagonal insertable multi-stage expansion bolt according to claim 3, characterized in that: The top burst point (2) comprises a top burst piece (7); the outer surface of the expansion sleeve (1) is provided with a top burst window (8); and the top burst piece (7) is connected inside the top burst window (8).

5. The hexagonal insertable multi-stage expansion bolt according to claim 4, characterized in that: One end of the bursting plate (7) is bent to form a double-layer structure (10).

6. The hexagonal insertable multi-stage expansion bolt according to claim 5, characterized in that: A reinforcing sheet (11) is fixedly installed inside the double-layer structure (10) of the top bursting sheet (7).

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