Steel plate screw

Abstract

A steel plate screw comprises a screw head, a screw rod arranged below the screw head, a leading-in part arranged below the screw rod and self-tapping teeth arranged on the screw rod and the leading-in part at equal intervals from top to bottom. And the contour line of the connection part of the lead-in part and the screw rod is a continuous curve with radian and has no break angle. A sub angle is formed between the central shaft of the screw and the surface of the lead-in part, and the angle increasing rate of the sub angle is large. The self-tapping teeth are divided into a first sub-angle alpha 1 close to one side of the screw head and a second sub-angle alpha 2 close to the leading-in part by a vertical line perpendicular to the axial direction of the screw rod, and the angle of the second sub-angle alpha 2 is larger than that of the first sub-angle alpha 1. According to the steel plate screw, the tapping efficiency, the tapping efficiency and the locking efficiency of the steel plate screw are improved by setting the distance between the self-tapping teeth, the angle of the sub-angle and the shape of the self-tapping teeth.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a steel plate screw. Background Art

[0002] Steel plate screws are steel wire products used to fix objects. They are widely used in various fields such as industry, agriculture, construction, and civil use. They are mainly used to fix objects with small axial separation force and small radial shear force. They have the characteristics of simple processing, easy use, and fast fixing.

[0003] China Patent Network has an application number CN202022158144.3 for a self-tapping screw, which includes a self-tapping screw, a nut, a cross slot, a hexagonal slot, a slot, a petal and an inner rod. The top of the self-tapping screw is fixed with a nut, the top of the nut is provided with a cross slot, the top of the nut is provided with a slot, the bottom periphery of the slot is provided with a notch, and the self-tapping screw is provided with a petal in the slot. A cross screwdriver or a hexagonal wrench can be selected for use, which can effectively meet the needs of different tool operations and greatly improve the flexibility of use; improve the stability between the self-tapping screw and the installed plate, not easy to fall off, and help to make the installation of the plate more secure.

[0004] Although the self-tapping screw has flexible steering capability and can meet the operation of different tools, the driving, tapping and locking efficiency of the self-tapping screw are insufficient. Utility Model Content

[0005] In view of this, the utility model provides a steel plate screw that can meet the above requirements.

[0006] A steel plate screw includes, from top to bottom, a screw head, a screw rod disposed below the screw head, an introduction portion disposed below the screw rod, and a self-tapping tooth equidistantly disposed on the screw rod and the introduction portion. The contour line of the connection between the introduction portion and the screw rod is a continuous curve with an arc and no angle. The central axis of the screw rod forms a sub-angle with the surface of the introduction portion, and the angle growth rate of the sub-angle is large. The self-tapping tooth is divided into two sub-angles by a vertical line perpendicular to the axial direction of the screw rod. The sub-angle close to the side of the screw head is a first sub-angle α1, and the one close to the introduction portion is a second sub-angle α2. The angle of the second sub-angle α2 is greater than the first sub-angle α1.

[0007] Furthermore, the shape of the screw head is a countersunk shape.

[0008] Furthermore, the screw head, the screw rod and the introduction portion are integrally arranged.

[0009] Furthermore, the central axes of the screw head, the screw rod and the introduction portion are arranged on the same straight line.

[0010] Furthermore, the pitch of the self-tapping thread is 1-2 mm.

[0011] Furthermore, the thread shape of the self-tapping teeth is a non-isosceles acute triangle.

[0012] Furthermore, the setting range of the first angle division is 5-20 degrees, and the setting range of the second angle division is 40-60 degrees.

[0013] Furthermore, a gap is left between the self-tapping thread and the bottom point of the introduction portion.

[0014] Compared with the prior art, the utility model provides a steel plate screw that accelerates the efficiency of tapping, threading and locking by setting the self-tapping teeth and the connecting profile of the introduction part and the screw rod. During installation, use a matching screwdriver to align the screw head and twist the steel plate screw to tap into the steel plate material. The sharp increase in the angle of deflection increases the pressure on the surface of the steel plate material, so that the steel plate screw can leave a deeper thread groove on the steel plate material, thereby facilitating the locking of the steel plate screw in the steel plate material. The self-tapping teeth are arranged on the screw rod and the introduction part, and a gap is left at the bottom point of the introduction part, so that the self-tapping teeth can tap while the steel plate screw is tapping into the steel plate material, without affecting the efficiency of the introduction part tapping into the steel plate material. The self-tapping teeth are arranged nearly parallel to the steel plate screw to increase the thread groove of the self-tapping teeth arranged on the steel plate screw, thereby increasing the tapping efficiency and facilitating locking after installation. Since the angle range of the second angle α2 of the self-tapping tooth is between 40-60 degrees, the resistance encountered by the self-tapping tooth when tapping into the steel plate member is more decomposed into lateral forces that do not hinder the tapping, which is beneficial for the self-tapping tooth to tap into the steel plate material; when screwing out the installed steel plate screw, since the angle range of the first angle α1 is between 5-20 degrees, the resistance encountered by the self-tapping tooth is less decomposed into lateral forces that do not affect the screwing out, so that the remaining resistance encountered by the self-tapping tooth counteracts the screwing force, making it difficult for the steel plate screw to be screwed out of the steel plate material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model provides a structural schematic diagram of a steel plate screw.

[0016] Figure 2 for Figure 1 Cross-section at A.

[0017] Figure 3 for Figure 1 A schematic diagram of the structure of a screw head having. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0019] See also Figures 1 to 3 , which is a schematic diagram of the structure of a steel plate screw provided by the utility model. The steel plate screw includes a screw head 10 from top to bottom, a screw rod 20 disposed below the screw head 10, an introduction portion 30 disposed below the screw rod 20, and a self-tapping thread 40 disposed on the outer surface of the screw rod 20 and the introduction portion 30. It can be imagined that the steel plate screw also includes some other functional modules, such as a plating mold, etc., which are well known to those skilled in the art and will not be repeated here.

[0020] The screw head 10 is used to maintain the surface of the steel plate material flat. In this embodiment, the shape of the screw head 10 is a countersunk head. When the steel plate screw is installed on the steel plate material, the countersunk screw head 10 sinks into the steel plate material as the screw rod 20 is tightly fixed to the steel plate material, and the friction between the screw head 10 and the steel plate material prevents the steel plate screw from being screwed out. It is conceivable that the screw head 10 can be other suitable shapes according to actual application requirements.

[0021] The screw rod 20 is used to receive the screw head 10 and the introduction part 30. The central axes of the screw rod 20, the screw head 10 and the introduction part 30 are arranged on the same straight line. The screw rod 20, the screw head 10 and the introduction part 30 are integrally arranged, so that the specifications of the steel plate screw meet the production standards, and the screw rod will not loosen due to tilting in actual production.

[0022] The introduction portion 30 is arranged below the screw rod 20 and is used to break through the undrilled steel plate material. The contour line of the connection between the introduction portion 30 and the screw rod 20 is a continuous curve with an arc and no angle. The central axis of the screw rod 20 forms a sub-angle with the surface of the introduction portion 30. The sub-angle increases sharply, and the angle growth rate of the sub-angle is large. The angle range of the sub-angle is between 20-35 degrees, and the height range of the introduction portion 30 is between 0-5 mm. The sharp increase in the sub-angle increases the pressure on the surface of the steel plate material, so that the steel plate screw can leave a deeper thread groove on the steel plate material, thereby locking the steel plate screw in the steel plate material.

[0023] The self-tapping teeth 40 are equidistantly arranged from the top of the screw head 10 connected to the screw rod 20 to the bottom of the introduction part 30, so as to increase the tapping efficiency of the self-tapping teeth 40, so that the introduction part 30 can also tap the steel plate material while tapping it. A gap is provided between the self-tapping teeth 40 and the bottom of the introduction part 30, so as to avoid the self-tapping teeth 40 affecting the angle of the introduction part tapping into the steel plate material, thereby increasing the tapping efficiency of the self-tapping teeth 40 without affecting the tapping efficiency of the introduction part 30. The helix angle of the self-tapping teeth 40 is set so that the self-tapping teeth 40 are arranged on the screw rod 20 and the introduction part 30 in a nearly parallel spiral, and the pitch of the self-tapping teeth 40 is between 1-2mm, so that the self-tapping teeth 40 leave more screw grooves on the surface of the steel plate material. The steel plate screw is installed so that the number of engagements between the self-tapping teeth 40 and the screw grooves increases, and the contact area increases, so that the steel plate screw and the steel plate material are tightly combined. The tooth shape of the self-tapping tooth 40 is a non-isosceles triangle. The vertex angle of the non-isosceles acute triangle is divided into two angles by a straight line perpendicular to the central axis of the screw 20. The first angle α1 is close to the screw head 10, and the second angle α2 is close to the introduction part 30. The setting range of the first angle α1 is between 5-20 degrees, and the angle range of the second angle α2 is between 40-60 degrees. The angle of the second angle α2 is larger than the first angle α1. When screwing in, because of the setting angle of the second angle α2, the self-tapping tooth can convert the friction resistance from the steel plate member. The outer side of the second angle α2 decomposes the friction force opposite to the attack direction into a lateral force perpendicular to the attack direction, thereby reducing the rotational resistance of the steel plate member, thereby enhancing the attack efficiency. When the screw is unscrewed, due to the setting angle of the first angle α1, the first angle α1 can only decompose a small amount of friction from the steel plate material. The outer edge of the first angle α1 decomposes part of the friction force opposite to the screwing direction into a lateral force perpendicular to the attacking direction. The remaining friction force still opposes the screwing force, making it difficult for the steel plate screw to loosen from the steel plate material.

[0024] Compared with the prior art, the utility model provides a steel plate screw that accelerates the efficiency of tapping, threading and locking by setting the self-tapping teeth 40 and the connecting profile of the introduction part 30 and the screw rod 20. During installation, the steel plate screw is screwed into the steel plate member with a matching screwdriver aligned with the screw head 10. The sharp increase in the angle of division increases the pressure on the surface of the steel plate material, so that the steel plate screw can leave a deeper thread groove on the steel plate material, thereby facilitating the locking of the steel plate screw in the steel plate material. The self-tapping teeth 40 are arranged on the screw rod 20 and the introduction part 30, and a gap is left at the bottom point of the introduction part 30, so that the self-tapping teeth 40 can tap while the steel plate screw is tapping into the steel plate material, without affecting the efficiency of the introduction part 30 tapping into the steel plate material. The self-tapping teeth 40 are arranged nearly parallel to the steel plate screw to increase the thread groove of the self-tapping teeth 40 arranged on the steel plate screw, thereby increasing the tapping efficiency and facilitating locking after installation. Since the angle range of the second angle α2 of the self-tapping tooth 40 is between 40-60 degrees, the resistance encountered by the self-tapping tooth 40 when striking the steel plate member is more decomposed into lateral forces that do not hinder the striking, which is beneficial for the self-tapping tooth 40 to strike the steel plate material; when screwing out the installed steel plate screw, since the angle range of the first angle α1 is between 5-20 degrees, the resistance encountered by the self-tapping tooth 40 is less decomposed into lateral forces that do not affect the screwing out, so that the remaining resistance encountered by the self-tapping tooth 40 counteracts the screwing force, making it difficult for the steel plate screw to be screwed out of the steel plate material.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A steel plate screw, characterized in that: The steel plate screw includes, from top to bottom, a screw head, a screw rod arranged below the screw head, an introduction part arranged below the screw rod, and a self-tapping tooth equidistantly arranged on the screw rod and the introduction part. The contour line of the connection between the introduction part and the screw rod is a continuous curve with an arc and no angle. The central axis of the screw rod forms a sub-angle with the surface of the introduction part. The angle growth rate of the sub-angle is large. The self-tapping tooth is divided into two sub-angles by a vertical line perpendicular to the axial direction of the screw rod. The sub-angle close to the side of the screw head is a first sub-angle α1, and the one close to the introduction part is a second sub-angle α2. The angle of the second sub-angle α2 is greater than the first sub-angle α1.

2. The steel plate screw according to claim 1, characterized in that: The shape of the screw head is a countersunk head shape.

3. The steel plate screw according to claim 1, characterized in that: The screw head, the screw rod and the introduction portion are integrally arranged.

4. The steel plate screw according to claim 1, characterized in that: The central axes of the screw head, the screw rod and the introduction portion are arranged on the same straight line.

5. The steel plate screw according to claim 1, characterized in that: The pitch of the self-tapping thread is 1-2 mm.

6. The steel plate screw according to claim 1, characterized in that: The tooth pattern of the self-tapping teeth is in the form of a non-isosceles acute-angle triangle.

7. The steel plate screw according to claim 1, characterized in that: The setting range of the first angle is 5-20 degrees, and the setting range of the second angle is 40-60 degrees.

8. The steel plate screw according to claim 1, characterized in that: A gap is left between the self-tapping thread and the bottom point of the introduction portion.

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