Self-drilling expansion screw

Abstract

The utility model discloses a self-drilling type expansion screw, which belongs to the technical field of expansion screws, and comprises a screw body and an expansion shell, the two sides of the bottom of the screw body are provided with open grooves, the top of the screw body is fixedly connected with two groups of supporting blocks, the supporting blocks are arranged in parallel, and a fixed shaft is fixedly connected between the two groups of supporting blocks; the fixing shaft is rotatably connected with a first connecting block, one side of the first connecting block is fixedly connected with a spring, and the end, away from the first connecting block, of the spring is fixedly connected to one side of the open groove. And meanwhile, the bolt in threaded connection with the top of the screw body is rotated, so that the stability between the fixed object and the screw body is further improved through the bolt, the whole is effectively prevented from falling off from the object, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion screws, in particular to a self-drilling expansion screw. Background Art

[0002] A self-drilling expansion screw, also known as a self-tapping and self-drilling screw, a drill point screw or a dovetail screw, is a fastener that combines the characteristics of a self-tapping screw and an expansion screw. When the existing self-drilling expansion screw is in use, there are still the following defects: poor stability, poor expansion effect, and it is easy to fall off the fixed object as a whole, affecting the use effect. Content of the Utility Model

[0003] The purpose of the utility model is to solve the defects existing in the prior art, and a self-drilling expansion screw is proposed.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a self-drilling expansion screw, including a screw body and an expansion shell, slots are opened on both sides of the bottom of the screw body, a support block is fixedly connected to the top of the screw body, there are two groups of the support blocks arranged in parallel, a fixed shaft is fixedly connected between the two groups of support blocks, a connecting block one is rotatably connected to the fixed shaft, a spring is fixedly connected to one side of the connecting block one, and the end of the spring far from the connecting block one is fixedly connected to one side of the slot.

[0005] As a further description of the above technical scheme:

[0006] The screw body is threadedly connected with the expansion shell.

[0007] As a further description of the above technical scheme:

[0008] A connecting block two is fixedly connected to the top end of the screw body, and a drill bit is fixedly connected to the bottom end of the screw body.

[0009] As a further description of the above technical scheme:

[0010] Locking balls are fixedly connected to the expansion shell.

[0011] As a further description of the above technical scheme:

[0012] There are multiple groups of the locking balls arranged circumferentially.

[0013] As a further description of the above technical scheme:

[0014] A bolt is threadedly connected to the top of the screw body.

[0015] The utility model has the following beneficial effects: In the utility model, when the self-drilling expansion screw is in use, after the screw body penetrates the object and the expansion shell, the connecting block 1 at the bottom of the screw body rebounds by the elastic force of the spring, so that the connecting block 1 tightly abuts against the inner wall of the opening of the object to be fixed, enhancing the structural stability. At the same time, the bolt rotationally threadedly connected to the top of the screw body further improves the stability between the object to be fixed and the screw body, effectively preventing the whole from falling off the object and improving the practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 6 is a side view of a self-drilling expansion screw proposed by the utility model;

[0017] Figure 2 FIG. 7 is a front view of a self-drilling expansion screw proposed by the utility model;

[0018] Figure 3 FIG. 8 is a schematic diagram of the slide rail of a self-drilling expansion screw proposed by the utility model.

[0019] LEGEND DESCRIPTION:

[0020] 1. Screw body; 2. Support block; 3. Fixed shaft; 4. Connecting block 1; 5. Spring; 6. Drill bit; 7. Bolt; 8. Connecting block 2; 9. Expansion shell; 10. Locking ball; 11. Groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Refer to Figures 1-3 , an embodiment provided by the present utility model: A self-drilling expansion screw includes a screw body 1 and an expansion shell 9. Grooves 11 are opened on both sides of the bottom of the screw body 1. A support block 2 is fixedly connected to the top of the screw body 1. There are two groups of support blocks 2 arranged in parallel. A fixed shaft 3 is fixedly connected between the two groups of support blocks 2. A connecting block 1 is rotatably connected to the fixed shaft 3. A spring 5 is fixedly connected to one side of the connecting block 1. One end of the spring 5 away from the connecting block 1 is fixedly connected to one side of the groove 11.

[0023] The screw body 1 is threadedly connected to the expansion shell 9. A second connecting block 8 is fixedly connected to the top end of the screw body 1, and a drill bit 6 is fixedly connected to the bottom end of the screw body 1 to increase the pressure and make the fixation more stable. A locking ball 10 is fixedly connected to the expansion shell 9, and multiple groups of locking balls 10 are arranged circumferentially to increase the friction force and enhance the fixation effect. A bolt 7 is threadedly connected to the top of the screw body 1 to make the bolt 7 closely fit with the object to be fixed and enhance the fixation stability.

[0024] Working principle: When the expansion screw needs to be used, place the expansion shell 9 in the pre-drilled hole, and rotate the screw body 1. The screw body 1 moves in the expansion shell 9 through the thread, and the first connecting block 4 is squeezed and contracted. The screw body 1 squeezes the expansion shell 9, and the expansion shell 9 expands. The drill bit 6 at the bottom end of the screw body 1 effectively drills to effectively fix the screw body 1. At the same time, when the slot 11 moves to the bottom of the expansion shell 9, the first connecting block 4 rebounds through the elastic force of the spring 5 to effectively fix the screw body 1. After the fixation is completed, rotate the bolt 7. The bolt 7 is threadedly connected to the top of the screw body 1 to reinforce between the screw body 1 and the object to be fixed.

[0025] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-drilling expansion screw, comprising a screw body (1) and an expansion shell (9), characterized in that: Slots (11) are provided on both sides of the bottom of the screw body (1); a support block (2) is fixedly connected to the top of the screw body (1); two groups of support blocks (2) are arranged in parallel; a fixed shaft (3) is fixedly connected between the two groups of support blocks (2); a connecting block (4) is rotatably connected to the fixed shaft (3); a spring (5) is fixedly connected to one side of the connecting block (4); and one end of the spring (5) away from the connecting block (4) is fixedly connected to one side of the slot (11).

2. A self-drilling expansion screw according to claim 1, characterized in that: The screw body (1) is threadedly connected to the expansion shell (9).

3. A self-drilling expansion screw according to claim 1, characterized in that: The top end of the screw body (1) is fixedly connected to a connecting block 2 (8), and the bottom end of the screw body (1) is fixedly connected to a drill bit (6).

4. A self-drilling expansion screw according to claim 2, characterized in that: A locking ball (10) is fixedly connected to the expansion shell (9).

5. A self-drilling expansion screw according to claim 4, characterized in that: The locking balls (10) are arranged in multiple groups around the circumference.

6. The self-drilling expansion screw according to claim 1, characterized in that: The top of the screw body (1) is threadedly connected with a bolt (7).

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