A self-drilling expansion screw

Abstract

The utility model belongs to the field of expansion screws, specifically is a kind of self-drilling type expansion screw, including drill bit, the one side of drill bit is provided with fixed component;Fixed component includes screw rod, and the one end of screw rod is fixedly installed with screw head, and the outer surface of screw rod movably installs connecting sleeve, and the one side of connecting sleeve is fixedly installed with unfolding arm, and the other side of unfolding arm is fixedly installed with first threaded sleeve, and first threaded sleeve is penetrated and is threadedly connected on the outer surface of screw rod, and the periphery of drill bit is provided with several chip guide grooves;And surface increases graphite molybdenum disulfide self-lubricating layer, reduces friction heat and chip adhesion;Through the linkage of first threaded sleeve and second threaded sleeve, drive unfolding arm and reinforcing movable arm synchronous opening, cooperate with the embedding of toothed clamping into hole wall, form multiple point expansion fixation, improve fixed strength and stability;Chip removal groove and chip guide groove design ensure that chip is smoothly discharged during drilling and expansion process, avoid the influence of installation effect caused by blockage.

Description

Technical Field

[0001] This utility model relates to the field of expansion screws, specifically a self-drilling expansion screw. Background Technology

[0002] Expansion bolts are commonly used fasteners, widely applied in construction, decoration, and furniture manufacturing. Their main function is to secure the bolt to rigid materials such as concrete and brick walls through an expansion mechanism, providing strong support. Expansion bolts typically consist of a bolt, sleeve, washer, and nut. Their working principle is that when the nut is tightened, the bolt causes the expansion sleeve to open, thus forming a tight frictional lock with the wall.

[0003] Chinese Patent No. CN202422129815.1 discloses a self-drilling expansion screw, including a screw body and an expansion shell. The screw body has slots on both sides of its bottom. A support block is fixedly connected to the top of the screw body. Two sets of support blocks are arranged in parallel. A fixed shaft is fixedly connected between the two sets of support blocks. A connecting block is rotatably connected to the fixed shaft. A spring is fixedly connected to one side of the connecting block. The end of the spring away from the connecting block is fixedly connected to the slotted side.

[0004] As can be seen from the above, the bolt further enhances the stability between the fixed object and the screw body, effectively preventing the whole from falling off the object and improving practicality. However, this case still has the following shortcomings: traditional expansion bolts require pre-drilling holes with a drill bit and then hammering the screw into the hole to complete the fixation. This has problems such as cumbersome installation steps, high requirements for operating space, and insufficient fixing strength. Especially when installing on hard materials such as concrete and steel, additional drilling tools are required, which is inefficient and inconvenient to operate.

[0005] Therefore, a self-drilling expansion bolt is proposed to address the above problems. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, such as the need for pre-drilling, cumbersome installation, and insufficient fixing strength of traditional expansion screws, this utility model proposes a self-drilling expansion screw.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: The self-drilling expansion screw of this utility model includes a drill bit, and a fixing component is provided on one side of the drill bit; the fixing component includes a screw rod, a screw head is fixedly installed at one end of the screw rod, a connecting sleeve is movably installed on the outer surface of the screw rod, an unfolding arm is fixedly installed on one side of the connecting sleeve, and a first threaded sleeve is fixedly installed on the other side of the unfolding arm, the first threaded sleeve passing through and threadedly connected to the outer surface of the screw rod.

[0008] Preferably, the drill bit has several chip guide grooves around its perimeter, and a screw is fixedly installed on one side of the back of the drill bit. The drill bit is made of a combination of cemented carbide and diamond coating, which improves the drilling efficiency of hard materials such as concrete and steel. In addition, a self-lubricating layer of graphite molybdenum disulfide is added to the surface to reduce frictional heat and chip adhesion.

[0009] Preferably, the fixing component further includes a second threaded sleeve, which is threaded through and connected to a screw.

[0010] Preferably, the fixing assembly further includes a reinforcing movable arm, one side of which is fixedly mounted on the outer surface of the screw.

[0011] Preferably, a plurality of linkage arms are fixedly installed on one side of the second threaded sleeve, and a first threaded sleeve is fixedly installed on the other end of the plurality of linkage arms.

[0012] Preferably, a plurality of retaining teeth are fixedly installed on one side of the connecting sleeve, and the connecting sleeve has a plurality of chip removal grooves.

[0013] The advantages of this utility model are:

[0014] 1. This utility model, through the structural design of the fixing components, drives the unfolding arm and the reinforcing movable arm to open synchronously through the linkage of the first threaded sleeve and the second threaded sleeve. With the help of the locking teeth embedded in the hole wall, it forms a multi-point expansion and fixing, which improves the fixing strength and stability. The chip removal groove and chip guide groove design ensure that the chips are smoothly discharged during drilling and expansion, avoiding blockage and affecting the installation effect.

[0015] 2. This utility model integrates the drill bit and screw into a single structure, eliminating the need for pre-drilling. Drilling and fixing are achieved directly by rotating the screw head, saving installation steps and improving construction efficiency. The carbide-diamond coating material and self-lubricating layer design of the drill bit significantly enhance the drilling ability of hard materials and reduce friction loss. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is an exploded view of the overall structure of this utility model;

[0019] Figure 3 This is an exploded view of the fixing component structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the fixed component structure of this utility model.

[0021] In the diagram: 1. Drill bit; 2. Fixing assembly; 11. Chip guide groove; 21. Screw; 22. Screw head; 23. Connecting sleeve; 24. Clamping tooth; 25. Expanding arm; 26. First threaded sleeve; 27. Linkage arm; 28. Second threaded sleeve; 29. ​​Reinforced movable arm; 31. Chip removal groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figures 1-4 As shown, a self-drilling expansion screw includes a drill bit 1, and a fixing component 2 is provided on one side of the drill bit 1; the fixing component 2 includes a screw rod 21, a screw head 22 is fixedly installed at one end of the screw rod 21, a connecting sleeve 23 is movably installed on the outer surface of the screw rod 21, an unfolding arm 25 is fixedly installed on one side of the connecting sleeve 23, and a first threaded sleeve 26 is fixedly installed on the other side of the unfolding arm 25. The first threaded sleeve 26 passes through and is threadedly connected to the outer surface of the screw rod 21.

[0024] During operation, the operating tool rotates the screw head 22 clockwise, causing the screw 21 and the front drill bit 1 to rotate synchronously. The drill bit 1 rapidly cuts hard materials such as concrete and steel using a cemented carbide and diamond-coated material. The retaining teeth 24 on the outside of the connecting sleeve 23 initially press against the hole wall as the whole rotates, providing initial positioning. The chips generated during drilling are discharged through the chip removal groove 31 of the connecting sleeve 23 and the chip guide groove 11 of the drill bit 1, preventing accumulation and obstruction of the drilling process. After drilling is completed, the screw head 22 is rotated counterclockwise, and the screw 21 is pushed into the hole due to the threaded drive. The first threaded sleeve 26 moves in the opposite direction to the screw head 22 along the external thread of the screw 21, pushing the connecting sleeve 23 outward through the unfolding arm 25. At the same time, the linkage arm 27 drives the second threaded sleeve 28 to move synchronously, driving the reinforcing movable arm 29 to open outward.

[0025] Furthermore, several chip guide grooves 11 are provided around the drill bit 1, and a screw 21 is fixedly installed on one side of the back of the drill bit 1. The drill bit 1 is made of a combination of cemented carbide and diamond coating, which improves the drilling efficiency of hard materials such as concrete and steel. In addition, a self-lubricating layer of graphite molybdenum disulfide is added to the surface to reduce frictional heat and chip adhesion.

[0026] During operation, align the expansion screw with the installation position and turn the screw head 22 clockwise using a tool. The drill bit 1 will then begin to rotate and drill. The chip guide groove 11 guides the chips generated during the drilling process to be discharged, reducing chip accumulation and its impact on drilling efficiency. Due to the characteristics of the material of the drill bit 1, it can quickly complete drilling in hard materials. The graphite molybdenum disulfide self-lubricating layer reduces friction between the drill bit and the material during the drilling process, reducing the generation of frictional heat, and at the same time preventing chips from adhering to the drill bit, making the drilling process smoother.

[0027] Furthermore, the fixing component 2 also includes a second threaded sleeve 28, which is threaded through and connected to the screw 21;

[0028] During operation, after the drill bit 1 completes drilling, the screw head 22 is rotated counterclockwise, and the screw 21 is pushed into the hole under the action of the thread, and the second threaded sleeve 28 moves accordingly.

[0029] Furthermore, the fixing component 2 also includes a reinforcing movable arm 29, one side of which is fixedly mounted on the outer surface of the screw 21;

[0030] During operation, the reinforced movable arm 29 reinforces the fixed component 2 during the screw advancement process, enhancing the stability of the overall structure.

[0031] Furthermore, a number of linkage arms 27 are fixedly installed on one side of the second threaded sleeve 28, and a first threaded sleeve 26 is fixedly installed on the other end of the linkage arms 27.

[0032] During operation, the first threaded sleeve 26 drives the second threaded sleeve 28 to move on the screw 21 via the moving linkage arm 27, causing the reinforcing movable arm 29 to gradually open, and cooperate with the unfolding arm 25 to form multi-point fixation, pressing against the hole wall to achieve expansion fixation.

[0033] Furthermore, multiple retaining teeth 24 are fixedly installed on one side of the connecting sleeve 23, and multiple chip removal grooves 31 are opened on the connecting sleeve 23;

[0034] During operation, the locking teeth 24 embed into the hole wall during the expansion process, increasing the reliability of the fixation, while the chip removal groove 31 assists in removing the debris generated during drilling and expansion, ensuring the smooth progress of the installation process.

[0035] Working principle: Align the expansion screw with the installation position, and rotate the screw head 22 clockwise using a tool. The drill bit 1 rotates synchronously with the screw rod 21. The chip guide groove 11 guides the drilling debris along the groove and discharges it. The cemented carbide combined with the diamond coating material quickly penetrates hard materials such as concrete and steel. The graphite molybdenum disulfide self-lubricating layer reduces frictional heat and prevents debris adhesion, improving drilling efficiency. After drilling is completed, rotate the screw head 22 counterclockwise, and the screw rod 21 advances into the hole. The first threaded sleeve 26 moves along the thread of the screw rod 21, and drives the second threaded sleeve 28 to move synchronously through the linkage arm 27, pushing the unfolding arm 25 and the reinforcing movable arm 29 to open outward and press against the hole wall. The retaining teeth 24 embed into the hole wall to increase friction, and the chip discharge groove 31 discharges the remaining debris, ultimately forming multi-point fixation and achieving a high-strength expansion effect.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A self-drilling expansion screw, comprising a drill bit (1), characterized in that: A fixing component (2) is provided on one side of the drill bit (1); the fixing component (2) includes a screw (21), a screw head (22) is fixedly installed at one end of the screw (21), a connecting sleeve (23) is movably installed on the outer surface of the screw (21), an unfolding arm (25) is fixedly installed on one side of the connecting sleeve (23), and a first threaded sleeve (26) is fixedly installed on the other side of the unfolding arm (25). The first threaded sleeve (26) passes through and is threadedly connected to the outer surface of the screw (21).

2. The self-drilling expansion screw according to claim 1, characterized in that: The drill bit (1) has several chip guide grooves (11) around its perimeter. A screw (21) is fixedly installed on one side of the back of the drill bit (1). The drill bit (1) is made of a combination of hard alloy and diamond coating, which improves the drilling efficiency of concrete and steel hard materials. In addition, a graphite molybdenum disulfide self-lubricating layer is added to the surface to reduce frictional heat and chip adhesion.

3. The self-drilling expansion screw according to claim 1, characterized in that: The fixing component (2) also includes a second threaded sleeve (28), which is threaded through and connected to a screw (21).

4. A self-drilling expansion screw according to claim 2, characterized in that: The fixing component (2) also includes a reinforcing movable arm (29), one side of which is fixedly installed on the outer surface of the screw (21).

5. A self-drilling expansion screw according to claim 3, characterized in that: A plurality of linkage arms (27) are fixedly installed on one side of the second threaded sleeve (28), and a first threaded sleeve (26) is fixedly installed on the other end of the plurality of linkage arms (27).

6. A self-drilling expansion screw according to claim 1, characterized in that: Multiple locking teeth (24) are fixedly installed on one side of the connecting sleeve (23), and multiple chip removal grooves (31) are opened on the connecting sleeve (23).

Images