Aluminum material window frame fixing combination tooth inlay drill tail screw

Abstract

The utility model proposes a kind of combined tooth inlaying drill tail screw for aluminium window frame fixation, to solve the problems of existing drill tail screw attack difficulty, inaccurate positioning and unsmooth chip removal, including screw head, screw rod and screw tail, screw head has nut and gasket, the upper end surface and lower end surface of nut are respectively provided with recess and gasket, screw rod surface is equipped with rotation thread section and twisted thread section, multiple V-shaped toothless grooves are equipped on rotation thread section and form broken mouth tooth structure, twisted thread section is equipped with spiral chip flute, screw tail is welded with diamond drill tail, the utility model realizes accurate positioning and rapid tapping by diamond drill tail, rotation thread section efficiently cuts cement matrix, twisted thread section timely removes chip, significantly improves attack efficiency and installation accuracy, and is suitable for aluminium window frame fixation in high-strength cement wall.

Description

Technical Field

[0001] This utility model relates to the field of self-drilling screw technology, and in particular to a combined toothed self-drilling screw for fixing aluminum window frames. Background Technology

[0002] As the construction industry continues to demand higher performance from materials, aluminum alloy window frames face new challenges when installed on concrete walls. Modern concrete walls generally have a strength of C30 or even higher, and the addition of materials such as fibers significantly improves their toughness. This exposes the obvious performance shortcomings of traditional self-drilling screws during installation. In actual construction, installers often encounter problems such as screws being difficult to drive in, inaccurate positioning leading to displacement and tilting, and poor chip removal causing jamming. These issues seriously affect construction efficiency and quality. Especially in high-altitude operations such as the installation of exterior windows in high-rise buildings, repeated installation failures not only prolong the work time but also increase construction safety risks.

[0003] The utility model patent with authorization announcement number CN214063498U discloses a "drill-tail screw" belonging to the field of fastener technology. The key technical point is that the screw includes a screw rod and a nut, which are integrally formed. The nut has a push plate with a first groove for sliding. The screw rod has a connecting rod fixedly connected to the push plate and a first through groove that mates with the connecting rod. The first through groove communicates with the first groove. The screw rod also has a rotatable screw head fixed to the screw rod. The connecting rod is rotatably connected to the screw head. This utility model provides a way to fix the connection between objects using a drill-tail screw, and can also strengthen the connection between the screw itself and the object. However, in actual use, this utility model relies solely on a single thread design and lacks a structure for continuously breaking up cement matrix. The torque increases instantaneously during insertion, requiring the operator to repeatedly apply impact force to screw it in, resulting in a long time consumption, a laborious and slow insertion process, and a high risk of jamming.

[0004] To improve drilling efficiency, utility model patent CN212838847U provides a "drill-tail screw for aluminum doors and windows," comprising a screw head and a screw shank. A sealing ring is provided between the screw head and the screw shank. The screw head has a washer, and the inner side of the washer has a slotted, Phillips, or Torx slot. One end of the screw shank is connected to the washer, and the other end of the screw shank has a drill bit. The surface of the drill bit has a 90° chamfered cutting edge, and the surface of the screw shank is surrounded by fine threads, with one end of the fine threads extending to the surface of the drill bit. This utility model has a simple structure. It features good stability, ease of use, and simple operation. The sealing ring between the screw head and shank effectively prevents loosening and falling off during use, extending the service life of the fastened components. The drill bit's surface has a 90° chamfered cutting edge, making it sharper, increasing strength, and enhancing durability. However, this new type of drill bit has fewer chip removal grooves and a smaller cross-section, leading to metal chip accumulation. This accumulation, if not promptly removed, can cause the screw to jam, affecting construction progress. As the drilling depth increases, the blockage area gradually expands, impacting continuous operation efficiency.

[0005] In summary, existing screws typically have the following disadvantages: 1) Difficulty in driving in: Traditional screws are difficult to drive into aluminum and cement matrix quickly due to their simple thread design, resulting in low construction efficiency. In actual use, they rely on simple straight cutting edge or single saw tooth cutting. Although the cutting edge is sharp, it lacks the structure of continuously breaking the cement matrix. The torque increases instantly when driving in, and the operator needs to repeatedly apply impact force to screw it in. It takes a long time, and the driving process is laborious, slow and easy to jam. 2) Inaccurate positioning: Some existing screws use a single thread cutting edge, which is prone to displacement during the driving process, resulting in inaccurate installation position and affecting the fixing effect of the window frame. Or the screw tail is only hardened with a sharp corner and does not have an independent drilling cutting edge, which cannot immediately form a stable center hole. The screw is prone to displacement, resulting in skewed screws and eccentric holes. It is necessary to enlarge the hole or re-drill the hole, reducing the success rate of installation on the first try. 3) Poor chip removal: Some existing self-tapping screws, although they have strong self-tapping ability during the driving process, have few chip removal grooves and small cross-sections. The chips cannot be discharged in time, which can easily lead to the accumulation of metal chips and cause the screw to get stuck, affecting the construction progress. As the driving depth increases, the blockage area gradually expands, affecting the efficiency of continuous operation. Summary of the Invention

[0006] The purpose of this utility model is to solve the problems in the prior art by proposing a combined toothed drill screw for fixing aluminum window frames, which can solve the problems of difficult driving, inaccurate positioning and poor chip removal.

[0007] To achieve the above objectives, this utility model proposes a combined threaded self-drilling screw for fixing aluminum window frames, comprising a screw head, a screw shank, and a screw tail. The screw head has a nut and a washer; the upper surface of the nut has a groove, and the washer is located on the lower surface of the nut; a connecting part is located between the nut and the screw shank, and the connecting part is integrally formed with the screw head and the screw shank; the screw shank extends downward from the connecting part, and its surface has a threaded portion, which sequentially includes a rotary thread section and a twist thread section; the screw tail is located at the end of the screw shank, and a diamond-shaped drill bit is welded to and fixed to the screw tail.

[0008] Preferably, the rotary thread segment and the twisted thread segment are continuously arranged and have equal axial lengths, and each of the rotary thread segment and the twisted thread segment occupies 1 / 2 of the total length of the screw.

[0009] Preferably, the rotating threaded segment includes a first thread and a second thread, the outer diameter of the first thread is larger than the outer diameter of the second thread, and the first thread is provided with at least three V-shaped tooth gaps, which are distributed at equal intervals along the circumference of the first thread to form a broken tooth pattern structure.

[0010] Preferably, the cross-section of the V-shaped notched groove is V-shaped, and the two sides of the groove intersect to form an obtuse angle, which is 100° to 150°.

[0011] Preferably, the outer surface of the twisted thread section is provided with several continuously spirally extending spiral chip removal grooves, and the cross-section of the spiral chip removal grooves is arc-shaped.

[0012] Preferably, the rhomboid drill tail has a four-sided pyramidal structure, and the end of the rhomboid drill tail is provided with a drill tail head, which has a conical tip structure.

[0013] Preferably, the groove is any one of a straight groove, a cross groove, or a plum blossom groove.

[0014] The beneficial effects of this utility model are: 1) Fast and reliable penetration: A precise center hole is drilled through the diamond-shaped drill tail and the cement is pre-crushed. Then, the V-shaped notched groove of the rotating thread section forms a continuous break in the circumference, forming a highly efficient broken tooth pattern that can quickly cut the cement matrix and cut hard cement into fine particles. The large-volume arc-shaped chip removal groove of the twisted thread section immediately conveys the particles backward, shortening the penetration time and improving efficiency. 2) Precise positioning: The flat diamond-shaped cutting tail welded to the end of the screw has a sharp cutting edge, which can achieve precise positioning and rapid hole opening when it contacts the workpiece at low speed, providing rigid guidance for subsequent threading and effectively solving the offset problem during initial penetration; the coaxiality of the nut and the drill tail is guaranteed by integral molding, and the initial offset is small.

[0015] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 An enlarged schematic diagram of the rotating threaded section.

[0017] Numbering in the diagram: 1-Screw head; 11-Nut; 12-Washer; 13-Groove; 2-Screw; 3-Connecting part; 4-Threaded part; 5-Rotating threaded section; 51-First thread; 52-Second thread; 53-V-shaped missing tooth groove; 6-Twisted threaded section; 61-Helical chip removal groove; 7-Screw tail; 71-Rhomboid drill tail; 72-Drill tail head. Detailed Implementation

[0018] Example 1: See Figures 1 to 2 This utility model discloses a combined threaded self-drilling screw for fixing aluminum window frames, comprising a screw head 1, a screw 2, and a screw tail 7, characterized in that: the screw head 1 has a nut 11 and a washer 12, such as... Figure 1 As shown, the upper end face of the nut 11 is provided with a groove 13, and the washer 12 is located on the lower end face of the nut 11; the connecting part 3 is located between the nut 11 and the screw 2, and the connecting part 3 is integrally formed with the screw head 1 and the screw 2. The screw 2 extends downward from the connecting part 3, and the surface of the screw 2 is provided with a threaded part 4. The threaded part 4 is provided with a rotating thread section 5 and a twisted thread section 6 in sequence; the screw tail 7 is located at the end of the screw 2, and the screw tail 7 is welded to and fixed with a diamond-shaped drill tail 71.

[0019] like Figure 2 As shown, the rotary thread segment 5 and the twisted thread segment 6 are continuously arranged and have equal axial lengths. Each of the rotary thread segment 5 and the twisted thread segment 6 occupies 1 / 2 of the total length of the screw 2. The rotary thread segment 5 includes a first thread 51 and a second thread 52. The outer diameter of the first thread 51 is larger than the outer diameter of the second thread 52. The first thread 51 is provided with at least three V-shaped notched tooth grooves 53. The V-shaped notched tooth grooves 53 are evenly distributed along the circumference of the first thread 51 and form a broken tooth pattern structure. The groove 53 has a V-shaped cross section, and the two sides of the V-shaped notched groove 53 intersect to form an obtuse angle, which is 100° to 150°; the outer surface of the twisted thread section 6 is provided with several continuously spirally extending spiral chip removal grooves 61, and the cross section of the spiral chip removal grooves 61 is arc-shaped; the rhomboid drill tail 71 has a four-sided pyramidal structure, and the end of the rhomboid drill tail 71 is provided with a drill tail head 72, which has a conical tip structure; the groove 13 is any one of a straight groove, a cross groove, or a plum blossom groove.

[0020] In this embodiment, an integral connecting part 3 is provided between the nut 11 and the screw 2; the screw 2 surface is provided with a rotary thread section 5 and a twist thread section 6 in sequence, and the two have equal axial lengths; the screw tail 7 is welded to fix a four-sided pyramidal rhomboid drill tail 71, the drill tail 72 is a conical tip, the first thread 51 is provided with three V-shaped missing tooth grooves 53, and the groove 13 is a slotted groove.

[0021] Example 2: This embodiment is basically the same as embodiment 1, except that: an elastic anti-loosening washer 14 is added between the lower end face of the nut 11 and the washer 12; two symmetrical side cutting grooves are opened on the outer surface of the rhomboid drill tail 71, and the groove 13 is a cross groove.

[0022] In this embodiment, the elastic anti-loosening washer 14 is compressed after tightening, generating a continuous rebound force to compensate for the micro-slippage between the aluminum profile and cement caused by temperature difference. The residual torque attenuation is reduced, and the side cutting groove enables the diamond-shaped drill tweezer 71 to form a composite cutting of main cutting edge and side cutting edge, increasing the opening diameter by 0.2mm, reducing subsequent thread friction heat, improving high-speed entry adaptability, and the cross groove can transmit greater torque. The high-speed setting of the electric screwdriver is less prone to slippage, making it suitable for continuous operation of power tools.

[0023] Example 3: This embodiment is basically the same as embodiment 1, except that: a spring-loaded spiral groove opposite to the spiral thread section 6 is added to the outer periphery of the screw 2, a heat-insulating damping ring is fitted on the outer edge of the nut 11, and the groove 13 is upgraded to a six-lobed plum blossom groove.

[0024] In this embodiment, the spring-loaded spiral groove stores reverse elastic deformation when tightened, forming a self-locking torque; when the window frame shows a tendency to loosen under wind load, the spring-loaded groove releases energy, automatically compensates for the torque, and maintains a tight connection; the heat insulation damping ring is made of nylon composite material, which blocks the thermal bridge between the aluminum profile and the steel nut, reduces the risk of condensation in winter, and absorbs some vibration, reducing noise transmission; the groove 13 of the plum blossom groove matches the hexagonal magnetic ring of the electric screwdriver, making the screwdriver bit less likely to fall off, suitable for quick one-handed construction in narrow windowsills or at upward angles.

[0025] Working principle: First, place the screw at the pre-set installation point on the aluminum window frame. The washer 12 at the lower end of the nut 11 fits against the surface of the profile, providing initial support. The screwdriver head is inserted into the groove 13 of the nut 11 to complete tool connection. The tool is started, and the torque is transmitted to the screw 2 through the connecting part 3. The diamond-shaped drill tip 71 at the end has a four-sided pyramidal structure. Starting from the conical drill tip 72, it cuts at high speed on the aluminum surface, self-drilling to form a guide hole that matches the diameter of the screw. No pre-drilling is required. The screw rotates and descends, and the twisted thread section 6 enters. The spiral chip removal groove 61 on the outer surface of the twisted thread section 6 continuously discharges aluminum chips along the spiral path out of the hole to avoid blockage. Then, the threaded section 5 is rotated into the hole. The outer diameter of the first thread 51 is larger than that of the second thread 52, and the stepped cutting reduces resistance. The V-shaped notched groove 53 cuts the aluminum material circumferentially at an obtuse angle of 100° to 150°, forming a uniformly distributed gap. The screw continues to penetrate, and the continuous thread deeply bites into the aluminum material, forming a composite thread structure with the rotating thread section 5, gradually increasing the tightening force. When the washer 12 is fully pressed against the surface of the aluminum material, the edge of the gap formed by the V-shaped notched groove 53 is elastically retracted by the aluminum material and embedded into the thread gap in the opposite direction. At the same time, the differentiated thread paths of the rotating thread section 5 and the twisted thread section 6 generate cross stress. The dual effect ensures that the screw remains locked under vibration or thermal expansion and contraction, completing the installation.

[0026] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A combination threaded self-drilling screw for fixing aluminum window frames, comprising a screw head (1), a screw shank (2), and a screw tail (7), characterized in that: The screw head (1) has a nut (11) and a washer (12). The upper end face of the nut (11) is provided with a groove (13), and the washer (12) is located on the lower end face of the nut (11). The connecting part (3) is located between the nut (11) and the screw (2). The connecting part (3) is integrally formed with the screw head (1) and the screw (2). The screw (2) extends downward from the connecting part (3). The surface of the screw (2) is provided with a threaded part (4). The threaded part (4) is provided with a rotating thread section (5) and a twisted thread section (6) in sequence. The screw tail (7) is located at the end of the screw (2). The screw tail (7) is welded and fixed with a diamond-shaped drill tail (71).

2. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 1, characterized in that: The rotary thread segment (5) and the twisted thread segment (6) are continuously arranged and have the same axial length. The rotary thread segment (5) and the twisted thread segment (6) each account for 1 / 2 of the total length of the screw (2).

3. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 1, characterized in that: The rotating thread segment (5) includes a first thread (51) and a second thread (52). The outer diameter of the first thread (51) is larger than the outer diameter of the second thread (52). The first thread (51) is provided with at least three V-shaped tooth grooves (53). The V-shaped tooth grooves (53) are distributed at equal intervals along the circumference of the first thread (51) and form a broken tooth pattern structure.

4. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 3, characterized in that: The cross-section of the V-shaped missing tooth groove (53) is V-shaped, and the two sides of the groove wall of the V-shaped missing tooth groove (53) intersect to form an obtuse angle, which is 100° to 150°.

5. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 1, characterized in that: The outer surface of the twisted thread section (6) is provided with several continuous spiral chip removal grooves (61), and the cross-section of the spiral chip removal grooves (61) is arc-shaped.

6. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 1, characterized in that: The rhomboid drill tail (71) has a four-sided pyramidal structure, and the end of the rhomboid drill tail (71) is provided with a drill tail head (72), which has a conical tip structure.

7. The combined threaded self-drilling screw for fixing aluminum window frames as described in claim 1, characterized in that: The groove (13) is any one of a straight groove, a cross groove, or a plum blossom groove.

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