Self drilling screw
By arranging an arc-shaped chip guide plate with a vortex structure on the lower end of the nut of the drill screw, the problem of debris accumulation when the drill screw drills into the component material is solved, and the fastening and cleaning convenience are improved.
Patent Information
- Application Number
- CN202421129989.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-23
AI Technical Summary
When drilling tail screws drill into component material, waste chips will accumulate between the lower end surface of the nut and the surface of the component, resulting in an increase in rotational resistance, affecting tightness, and causing troubles in subsequent cleaning.
A drill tail screw is designed. The lower end surface of the nut is equipped with a chip guide part, including multiple arc-shaped chip guide plates and guide chip plates, forming a vortex structure that can effectively guide and discharge waste chips.
Through the vortex structure of the arc-shaped chip guide plate, the waste chips are centrifugally thrown out along the arc surface, away from the bottom of the nut, preventing waste chips from accumulating and falling back into the preset hole, and improving the fastening between the drill tail screw and the component. performance and simplifies subsequent cleanup.
Smart Images
Figure CN222363248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of screws, in particular to a self-drilling screw. Background Art
[0002] The structural feature of the self-drilling screw is that the tail of the screw is in the shape of a drill tail or a pointed tail. The self-drilling screw does not require auxiliary processing and can be directly used for drilling, tapping and locking on the setting material and the base material, thereby greatly saving construction time. Due to its advantages, it has been widely used.
[0003] When the self-drilling screw drills into the component material, the self-drilling screw rotates under the drive of the tool, and the component material is broken into fine chips by the drill tail, forming a preset hole with a corresponding internal thread. The self-drilling screw is discharged out of the preset hole through the chip groove formed on the tail of its cutting screw. Therefore, when drilling, the waste chips will splash out along the chip groove and fall next to the preset hole.
[0004] Since some waste chips will gradually accumulate between the lower end face of the nut and the surface of the component, and then remain in the gap, they can easily fall into the preset hole again, causing increased resistance to relative rotation between the self-drilling screw and the component, affecting the fastening between the self-drilling screw and the component, and making subsequent cleaning operations troublesome. Therefore, it is necessary to propose a new self-drilling screw improvement plan to solve this problem. Utility Model Content
[0005] In view of this, the purpose of the present invention is to provide a self-drilling screw to solve the above problems.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0007] The utility model provides a self-drilling screw, which comprises a nut and a screw rod connected at the center of the lower end surface of the nut.
[0008] The tail of the screw rod away from the nut constitutes a drill tail portion, and the drill tail portion includes a drill body and a chip removal groove formed beside the drill body.
[0009] A chip guide portion is provided on the lower end face of the nut, and the chip guide portion includes a plurality of arcuate chip guide plates arranged around the screw rod, and the arcuate chip guide plates protrude from the lower end face of the nut. Each of the arcuate chip guide plates expands outward from the head end adjacent to the screw rod to the end at the outer circumference of the lower end face, forming a vortex structure away from the center of the circle of the lower end face.
[0010] Preferably, the chip guide portion also includes a chip guide plate, which is arranged between every two adjacent arc-shaped chip guide plates and is in the shape of an arc protruding from the lower end surface of the nut. One end of the chip guide plate is located at the outer circumference of the lower end surface, and the other end is located between the screw and the outer circumference of the lower end surface.
[0011] Preferably, a plurality of arc-shaped chip guide plates are symmetrical around the center of the screw.
[0012] Preferably, the arc-shaped chip guide plate and the chip guiding plate are elastic rubber strips with smooth surfaces.
[0013] Preferably, the chip guiding portion is a detachable elastic gasket sleeved on the screw.
[0014] Preferably, the drill body is a cone structure formed by a plurality of cutting surfaces.
[0015] Preferably, chip removal grooves are formed on both sides of the drill body, and the chip removal grooves extend forward from the tip of the drill body toward the nut spirally.
[0016] The technical effects achieved by the technical solution of the utility model mainly include:
[0017] The above-mentioned self-drilling screw uses the drill body of the drill tail to make a hole on the surface of the component, and the waste chips crushed into the component material are taken out of the hole by the chip removal groove beside the drill body. As the self-drilling screw penetrates into the preset hole formed on the component, the lower end face of the nut is close to the surface of the component, and the arc-shaped chip guide plate on the lower end face contacts the waste chips accumulated on the surface of the component and rotates with the twisting of the nut. Since the chip guide part has the above-mentioned arc-shaped chip guide plate with a vortex structure, the waste chips will be centrifugally thrown out along the arc surface and away from the bottom of the nut, preventing the waste chips from gradually accumulating between the lower end face of the nut and the surface of the component, and then preventing the waste chips from falling back into the preset hole, avoiding the waste chips from affecting the fastening between the self-drilling screw and the component, and facilitating subsequent cleaning;
[0018] The drill body is a cone structure formed by multiple cutting surfaces gathered in one place. Chip grooves are formed on both sides of the drill body, which can not only increase the drilling speed, but also enable multiple cutting surfaces to serve as different fulcrums to support the drill body when drilling. The drill tail is not easy to deviate when tapping the preset hole, which plays a role in fast drilling and locking positioning.
[0019] Chip removal grooves are formed on both sides of the drill body. The chip removal grooves extend forward from the tip of the drill body toward the nut spiral and can be consistent with the rotation direction of the thread, which helps to quickly discharge waste chips. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the self-drilling screw provided in an embodiment of the utility model;
[0021] Figure 2 is a schematic diagram corresponding to the lower end surface of the nut in the self-drilling screw viewed from the front;
[0022] Figure 3 It is a schematic diagram corresponding to the upper end surface of the nut in the self-drilling screw when viewed from the front.
[0023] The reference numerals in the above drawings are:
[0024] The nut 1, the lower end surface 1a of the nut, the upper end surface 1b of the nut, a cross screw groove 10, a chip guide portion 11, an arc-shaped chip guide plate 111, a guiding chip plate 112, a screw rod 2, a drill tail portion 3, a drill body 31, and a chip removal groove 32 are provided. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.
[0026] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not very relevant are omitted.
[0027] Reference Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a self-drilling screw, which includes a nut 1 and a screw rod 2 connected at the center of the lower end surface 1a of the nut 1.
[0028] The tail of the screw rod 2 away from the nut 1 constitutes a drill tail portion 3, and the drill tail portion 3 includes a drill body 31 and a chip removal groove 32 formed beside the drill body 31.
[0029] Among them, a chip guide portion 11 is provided on the lower end surface 1a of the nut 1, and the chip guide portion 11 includes a plurality of arcuate chip guide plates 111 arranged around the screw rod 2, and the arcuate chip guide plates 111 protrude from the lower end surface 1a of the nut 1. Each of the arcuate chip guide plates 111 expands outward from the head end adjacent to the screw rod 2 to the end at the outer circumference of the lower end surface 1a, forming a vortex structure away from the center of the circle of the lower end surface 1a.
[0030] The above-mentioned self-drilling screw provided by the embodiment of the utility model utilizes the drill body 31 of the drill tail part 3 to make a hole on the surface of the component, and the waste chips crushed into the component material are brought out of the hole by the chip removal groove 32 next to the drill body 31. As the self-drilling screw penetrates into the preset hole formed on the component, the lower end face 1a of the nut 1 is close to the surface of the component, and the arc-shaped chip guide plate 111 on the lower end face 1a contacts the waste chips accumulated on the surface of the component. As the nut 1 is twisted and rotates, since the arc-shaped chip guide plate 111 is equivalent to the blades constituting a vortex structure, the waste chips will be centrifugally thrown out along the arc surface and away from the bottom of the nut 1, preventing the waste chips from gradually accumulating between the lower end face 1a of the nut 1 and the surface of the component, and then preventing the waste chips from falling back into the preset hole, avoiding the waste chips from affecting the fastening between the self-drilling screw and the component, and facilitating subsequent cleaning.
[0031] Furthermore, the chip guide portion 11 further includes a chip guide plate 112, which is disposed between every two adjacent arc-shaped chip guide plates 111 and is in the shape of an arc surface protruding from the lower end surface 1a of the nut 1. One end of the chip guide plate 112 is located at the outer circumference of the lower end surface 1a, and the other end is located between the screw 2 and the outer circumference of the lower end surface 1a. As the arc-shaped chip guide plate 111 expands outward from the head end of the adjacent screw 2, the spacing between adjacent arc-shaped chip guide plates 111 increases. Therefore, the provision of the chip guide plate 112 on the adjacent arc-shaped chip guide plates 111 can play a supplementary auxiliary role, increase the effective area for guiding and removing chips, and improve the effect of guiding and removing waste chips under the nut 1.
[0032] A plurality of arc-shaped chip guide plates 111 are symmetrical around the center of the screw 2. The central symmetrical structure enables the arc-shaped chip guide plates 111 on the lower end surface 1a to be evenly distributed, and the chip guiding effect covers the entire area, and the standard symmetrical structure is also convenient for production and processing.
[0033] In this embodiment, the arc-shaped chip guide plate 111 and the guiding chip guide plate 112 are elastic rubber strips with smooth surfaces. The smooth surface can prevent the friction of the arc-shaped chip guide plate 111 and the guiding chip guide plate 112 from affecting the component surface, and the elastic rubber strip can keep close to the construction surface to sweep away the waste chips, so as to clean more thoroughly.
[0034] If the self-drilling screw needs to be completely sunk into the component, it is necessary to make the chip guide part 11 removable after completing the cleaning of the waste chips under the nut 1 to avoid blocking the nut 1. Therefore, as an implementation mode of the chip guide part 11, the chip guide part 11 is a detachable elastic gasket sleeved on the screw rod 2.
[0035] Specifically, the drill body 31 is a conical structure composed of multiple cutting surfaces gathered in one place. Having multiple cutting surfaces can not only improve the drilling speed, but also enable the multiple cutting surfaces to support the drill body 31 as different fulcrums when drilling. The drill tail 3 is not easy to shift when tapping the preset hole, which plays a role in rapid drilling and locking positioning.
[0036] Generally, self-drilling screws need to be drilled with a screwing tool. A cross electric screwdriver is a common screwing tool. Figure 3 As shown, for example, the upper end surface 1b of the nut 1 is provided with a cross screw groove 10. Of course, screw grooves of different shapes can also be provided as required in actual application.
[0037] The two sides of the drill body 31 are respectively formed with chip removal grooves 32 , which spirally extend forward from the tip of the drill body 31 toward the nut 1 and can be consistent with the rotation direction of the thread, so that the chip removal efficiency is further improved.
[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0039] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A self-drilling screw, characterized in that: The self-drilling screw comprises a nut (1) and a screw rod (2) connected at the center of the lower end surface (1a) of the nut (1). The tail of the screw rod (2) away from the nut (1) constitutes a drill tail portion (3), and the drill tail portion (3) includes a drill body (31) and a chip removal groove (32) formed beside the drill body (31). A chip guide portion (11) is provided on the lower end surface (1a) of the nut (1), and the chip guide portion (11) comprises a plurality of arc-shaped chip guide plates (111) arranged around the screw rod (2), and the arc-shaped chip guide plates (111) protrude from the lower end surface (1a) of the nut (1), and each of the arc-shaped chip guide plates (111) expands outward from the head end adjacent to the screw rod (2) to the end at the outer circumference of the lower end surface (1a), forming a vortex structure away from the center of the circle of the lower end surface (1a).
2. The self-drilling screw according to claim 1, characterized in that: The chip guide portion (11) further comprises a chip guide plate (112), which is arranged between every two adjacent arc-shaped chip guide plates (111) and is in the shape of an arc surface protruding from the lower end surface (1a) of the nut (1); one end of the chip guide plate (112) is located at the outer circumference of the lower end surface (1a), and the other end is located between the screw rod (2) and the outer circumference of the lower end surface (1a).
3. The self-drilling screw according to claim 1, characterized in that: A plurality of arc-shaped chip guide plates (111) are symmetrical around the center of the screw rod (2).
4. The self-drilling screw according to claim 2, characterized in that: The arc-shaped chip guide plate (111) and the chip guiding plate (112) are elastic rubber strips with smooth surfaces.
5. The self-drilling screw according to claim 1, characterized in that: The chip guide portion (11) is a detachable elastic gasket sleeved on the screw rod (2).
6. The self-drilling screw according to claim 1, characterized in that: The drill body (31) is a cone structure formed by a plurality of cutting surfaces gathered at one place.
7. The self-drilling screw according to claim 1, characterized in that: The upper end surface (1b) of the nut (1) is provided with a cross screw groove (10).
8. The self-drilling screw according to claim 1, characterized in that: Chip removal grooves (32) are respectively formed on both sides of the drill body (31), and the chip removal grooves (32) extend spirally forward from the tip of the drill body (31) toward the nut (1).