Self-tapping screw with centering device

Abstract

The utility model provides a self-tapping screw with a centering device. The self-tapping screw is mainly composed of a screw body and the centering device. Spiral threads are arranged on the periphery of the screw body, a cutting edge is arranged on the head portion of the screw body, the centering device comprises two fixing blocks (the first fixing block is H-shaped, the second fixing block is flat-plate-shaped) with through holes formed in the middles, the two fixing blocks are connected through a screw rod, the distance between the two fixing blocks is adjusted, and accurate centering is achieved. The two fixing blocks are each of a half-and-half structure and are formed by splitting two half blocks along the symmetry axis and then splicing the two half blocks. A positioning hole is formed in the side wall of the first fixing block and is perpendicular to the threaded hole, the two half blocks of the first fixing block can be locked after the pin shaft penetrates through the positioning hole, and the side wall is provided with a rapid locking structure. The screw can be quickly and accurately fixed, the operation difficulty is reduced, the working efficiency is improved, and the screw is suitable for various fixing operations.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fasteners, in particular to a self-tapping screw with a centering device. BACKGROUND

[0002] In the prior art, the fixing process of a self-tapping screw usually requires pre-drilling a hole on the object to be fixed before the screw can be screwed in. Although this traditional method can ensure a certain fixing effect, it has many shortcomings. First, the drilling process increases the workload and reduces work efficiency. Second, for non-professionals, the accuracy of drilling is difficult to guarantee, which may lead to insecure fixing or screw skewing. In addition, the operator needs to maintain the centering force when tightening the screw, which increases the operation difficulty. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a self-tapping screw with a centering device to solve the above problems, realize fast and accurate fixing, reduce the workload, improve work efficiency, and reduce the operation difficulty. To achieve the above purpose, the present application provides the following technical scheme: a self-tapping screw with a centering device, comprising:

[0004] A screw body, the screw body has a helical thread around the periphery, and the screw head has a cutting edge;

[0005] A centering device, the centering device is a fixed block with through holes at two intermediate positions, namely a first fixed block and a second fixed block. The second fixed block is a flat plate type and has through holes on both sides. The first fixed block is H-shaped and has threaded holes on both sides corresponding to the through holes. A screw rod passes through the threaded holes and the through holes in sequence to connect the first fixed block and the second fixed block. The top end of the screw rod is provided with a gasket. Turning the screw rod can adjust the distance between the first fixed block and the second fixed block;

[0006] Both the first fixed block and the second fixed block are half-structure, that is, they are composed of two halves along their symmetry axis, that is, the axis of the through hole;

[0007] A positioning hole is provided on the side wall of the first fixed block. The positioning hole penetrates the first fixed block and is perpendicular to the threaded hole;

[0008] A pin shaft is provided on the side wall of the first fixed block. The pin shaft has a quick locking structure and can lock the two halves of the first fixed block after passing through the positioning hole.

[0009] Preferably, two pin shafts are symmetrically arranged on the side wall of the first fixed block, and the two pin shafts are respectively located on both sides of the threaded hole.

[0010] Preferably, the quick locking structure comprises a circular protrusion and a spring, a cavity is arranged in the pin shaft, the circular protrusion is arranged in the cavity, and the two ends of the spring are respectively abutted against the circular protrusion and the inner wall of the cavity.

[0011] Preferably, the self-tapping screw further comprises a reinforcing sheet, the reinforcing sheet is arranged on the side wall of the first fixing block and located at the positioning hole.

[0012] Preferably, the reinforcing sheet is integrally arranged with the first fixing block.

[0013] Preferably, the length of the screw rod is greater than the sum of the lengths of the first fixing block and the second fixing block.

[0014] Preferably, the diameter of the through hole is matched with the diameter of the screw rod body, so that the screw rod can pass through smoothly and be centered.

[0015] Preferably, the gasket is fixedly connected with the screw rod, and the diameter of the gasket is greater than the diameter of the through hole.

[0016] Compared with the prior art, the self-tapping screw with a centering device has the following beneficial effects:

[0017] The self-tapping screw with a centering device is provided, the screw body and the centering device are combined skillfully, and quick and accurate fixing effect is achieved. Compared with the prior art, the self-tapping screw with a centering device has obvious advantages in improving fixing efficiency. Due to the existence of the centering device, the screw can be automatically centered during the fixing process, the operation difficulty is greatly reduced, the working time is reduced, and the working efficiency is improved. The centering device is designed skillfully, and comprises two fixing blocks provided with through holes in the middle positions, i.e., a first fixing block and a second fixing block. The two fixing blocks can be connected through a screw rod, and the distance between the two fixing blocks can be adjusted by rotating the screw rod, so that accurate centering and adaptation to screws with different lengths are realized. The first fixing block and the second fixing block are both half-structure, and the half-structure design makes the first fixing block and the second fixing block be removed after the screw is drilled. The positioning hole is arranged on the side wall of the first fixing block, and the positioning hole is perpendicular to the threaded hole, so that the pin shaft can pass through the positioning hole smoothly, and the two half blocks of the first fixing block are locked. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The self-tapping screw with a centering device is provided, the screw body and the centering device are combined skillfully, and quick and accurate fixing effect is achieved. Compared with the prior art, the self-tapping screw with a centering device has obvious advantages in improving fixing efficiency. Due to the existence of the centering device, the screw can be automatically centered during the fixing process, the operation difficulty is greatly reduced, the working time is reduced, and the working efficiency is improved. The centering device is designed skillfully, and comprises two fixing blocks provided with through holes in the middle positions, i.e., a first fixing block and a second fixing block. The two fixing blocks can be connected through a screw rod, and the distance between the two fixing blocks can be adjusted by rotating the screw rod, so that accurate centering and adaptation to screws with different lengths are realized. The first fixing block and the second fixing block are both half-structure, and the half-structure design makes the first fixing block and the second fixing block be removed after the screw is drilled. The positioning hole is arranged on the side wall of the first fixing block, and the positioning hole is perpendicular to the threaded hole, so that the pin shaft can pass through the positioning hole smoothly, and the two half blocks of the first fixing block are locked.

[0019] Figure 2A front view of a self-tapping screw with a centering device according to an embodiment of the present application;

[0020] Figure 3 A bottom view of a self-tapping screw with a centering device according to an embodiment of the present application;

[0021] Figure 4 An exploded view of a quick locking structure according to an embodiment of the present application;

[0022] In the figure: 1, screw body; 2, cutting edge; 3, centering device; 4, through hole; 5, first fixing block; 6, second fixing block; 7, through hole; 8, threaded hole; 9, screw rod; 10, gasket; 11, positioning hole; 12, pin shaft; 13, quick locking structure; 14, circular protrusion; 15, spring; 16, cavity; 17, reinforcing sheet; DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] It should be noted that, in the description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In addition, it should be understood that, for the convenience of description, the sizes of the various components shown in the drawings are not drawn in accordance with the actual proportional relationship, for example: the thickness or width of certain layers can be exaggerated relative to other layers.

[0026] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further specifically discussed and described in the description of subsequent drawings.

[0027] To solve the technical problems in the background art, as shown in Figures 1-4 The present application provides a technical solution: a self-tapping screw with a centering device, characterized as follows:

[0028] Screw body (1) has a continuous helical thread around its periphery for screwing into a fixed object and forming a corresponding internal thread therein. The screw head is provided with a cutting edge (2) designed to cut the material of the fixed object during screwing to form a matching thread. The centering device (3) consists of two fixed blocks, namely the first fixed block (5) and the second fixed block (6). The middle position of the two fixed blocks is provided with a through hole (4) for centering and fixing the screw body (1). The first fixed block (5) is H-shaped, and the two sides are provided with threaded holes (8) corresponding to the through holes (7). The second fixed block (6) is a flat plate, and the two sides are provided with through holes (7). The screw rod (9) passes through the threaded holes (8) and the through holes (7) in turn, connecting the first fixed block (5) and the second fixed block (6) together. The top end of the screw rod (9) is provided with a gasket (10), which is welded with the screw rod (9), and the gasket (10) is used to prevent the screw rod (9) from being separated from the second fixed block (6) when rotating. The first fixed block (5) and the second fixed block (6) are both half-structure, which are composed of two halves along the symmetry axis, that is, the axis of the through hole (4). The side wall of the first fixed block (5) is provided with a positioning hole (11) which penetrates the first fixed block (5) and is perpendicular to the threaded hole (8). The positioning hole (11) is used to guide the insertion and positioning of the pin shaft (12). The side wall of the pin shaft (12) has a quick locking structure (13), which can quickly lock the two halves of the first fixed block (5) after the pin shaft (12) passes through the positioning hole (11), ensuring the stability and firmness of the fixed block.

[0029] It should be noted that two pin shafts (12) are symmetrically arranged on the side wall of the first fixed block (5). This symmetrical layout ensures the balance and stability of the first fixed block (5) during locking. The two pin shafts (12) are respectively located on both sides of the threaded hole (8), so that uniform locking force can be provided between the two halves of the first fixed block (5). The pin shaft (12) is inserted through the positioning hole (11), and each pin shaft (12) corresponds to a positioning hole (11). Since the pin shaft (12) is located on both sides of the threaded hole (8), this layout helps the two halves of the first fixed block (5) to bear force uniformly when tightening the screw rod (9), preventing deflection or damage due to uneven force.

[0030] Further, the quick locking structure (13) mainly includes a circular protrusion (14) and a spring (15). This structure is designed to achieve the quick locking function of the pin shaft (12), ensuring that the two halves of the first fixing block (5) can be quickly and securely locked. The pin shaft (12) is designed with a cavity (16) inside, which is a cylindrical or similar shaped space for accommodating the circular protrusion (14) and the spring (15). The circular protrusion (14) is a cylindrical protrusion arranged inside the cavity (16). When the pin shaft (12) passes through the positioning hole (11), the circular protrusion (14) will protrude from the cavity (16) and come into contact with the side wall of the first fixing block (5). The spring (15) is arranged inside the cavity (16), with its two ends respectively abutting the circular protrusion (14) and the inner wall of the cavity (16). The elastic action of the spring (15) ensures that the circular protrusion (14) can quickly pop out after the pin shaft (12) passes through the positioning hole (11) and tightly contact the side wall of the first fixing block (5). When the pin shaft (12) passes through the positioning hole (11), the spring (15) is compressed, and the circular protrusion (14) enters the cavity (16). Once the pin shaft (12) completely passes through the positioning hole (11), the elastic action of the spring (15) pushes the circular protrusion (14) to pop out and contact the side wall of the first fixing block (5), thereby achieving quick locking. When unlocking, the circular protrusion (14) can be pressed back into the cavity (16) by applying an external force, thereby compressing the spring (15) and allowing the pin shaft (12) to be smoothly pulled out of the positioning hole (11).

[0031] It should be noted that in order to enhance the strength of the first fixing block (5) at the positioning hole (11), a reinforcing sheet (17) is specially designed. The reinforcing sheet (17) is an additional metal sheet or structure arranged on the side wall of the first fixing block (5) and located at the position of the positioning hole (11). The main function of the reinforcing sheet (17) is to improve the mechanical strength of the first fixing block (5) in the area where the pin shaft (12) passes through, preventing the side wall of the first fixing block (5) from being worn or deformed due to repeated insertion and removal of the pin shaft (12). The reinforcing sheet (17) can be fixed on the side wall of the first fixing block (5) by welding, riveting or adhesion, etc.

[0032] Further, the reinforcing sheet (17) and the first fixing block (5) are manufactured by an integrated forming process, which means that the reinforcing sheet (17) is formed at the same time as the first fixing block (5) during the manufacturing process, rather than being attached or connected later. This design can improve the stability and reliability of the overall structure.

[0033] It is important to note that the screw rod (9) is designed to be longer than the sum of the lengths of the first fixed block (5) and the second fixed block (6). This design allows the screw rod (9) to have sufficient length for adjustment and fixation after passing through the threaded holes (8) and the through holes (7) of the two fixed blocks. The excess length of the screw rod (9) provides an additional adjustment range, allowing the user to adjust the distance between the first fixed block (5) and the second fixed block (6) according to actual needs.

[0034] It is important to note that the diameter of the through hole (4) is designed to be slightly larger than the diameter of the main body of the screw rod (9) to ensure that the screw rod (9) can pass through the through hole (4) smoothly without any obstruction. The through hole (4) can also achieve the centering of the screw rod 9. This design can ensure that the screw rod (9) has a proper gap when passing through the through hole (4), reducing friction and wear, while ensuring the stability of the fixed block during adjustment.

[0035] It is important to note that the gasket (10) is fixedly connected with the screw rod (9), which can be connected by welding, to ensure that the gasket (10) will not separate from the screw rod (9) during use. The diameter of the gasket (10) is designed to be larger than the diameter of the through hole (7), so that when the screw rod (9) rotates, the gasket (10) can cover and exceed the edge of the through hole (7), ensuring that the screw rod 9 will not separate from the second fixed block 6.

[0036] Although embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A self-tapping screw having a centering device, characterized in that The utility model relates to a centering device for screw, which comprises: a screw body (1) with a helical thread around the periphery and a screw head with a cutting edge (2); a centering device (3) provided with two fixed blocks with through holes (4) in two middle positions, i.e. a first fixed block (5) and a second fixed block (6), the second fixed block (6) being a flat plate with through holes (7) on both sides, the first fixed block (5) being an H-shaped block with threaded holes (8) on both sides corresponding to the through holes (7), a screw rod (9) passing through the threaded holes (8) and the through holes (7) in sequence to connect the first fixed block (5) and the second fixed block (6), and a washer (10) provided at the top end of the screw rod (9), the distance between the first fixed block (5) and the second fixed block (6) being adjustable by rotating the screw rod (9); both the first fixed block (5) and the second fixed block (6) are half-structure, i.e. two half blocks are spliced after being cut along the axis of symmetry, i.e. the axis of the through hole (4); a positioning hole (11) is provided on the side wall of the first fixed block (5), the positioning hole (11) passing through the first fixed block (5) and being perpendicular to the threaded hole (8); a pin shaft (12) with a quick locking structure (13) on the side wall, the pin shaft (12) passing through the positioning hole (11) to lock the two half blocks of the first fixed block (5).

2. A self-auguring screw with centering device according to claim 1, characterized in that two pin shafts (12) are symmetrically provided on the side wall of the first fixed block (5), and the two pin shafts (12) are respectively located on both sides of the threaded hole (8).

3. A self-auguring screw with a centering device according to claim 2, characterized in that, The quick locking structure (13) comprises a circular protrusion (14) and a spring (15), a cavity (16) is provided in the pin shaft (12), the circular protrusion (14) is arranged in the cavity (16), and the two ends of the spring (15) respectively abut against the circular protrusion (14) and the inner wall of the cavity (16).

4. A self-auguring screw with a centering device according to claim 3, characterized in that, The utility model also comprises a reinforcing sheet (17) provided on the side wall of the first fixed block (5) and located at the positioning hole (11).

5. A self-auguring screw with a centering device according to claim 4, characterized in that, The reinforcing sheet (17) is integrally formed with the first fixed block (5).

6. A self-augmenting screw with centering device according to claim 1, characterized in that The length of the screw rod (9) is greater than the sum of the lengths of the first fixed block (5) and the second fixed block (6).

7. A self-augmenting screw with centering device according to claim 1, characterized in that The diameter of the through hole (4) is matched with the diameter of the main body of the screw rod (9), so that the screw rod (9) can pass through smoothly and realize centering.

8. A self-augmenting screw with centering device according to claim 1, characterized in that, The washer (10) is fixedly connected with the screw rod (9), and the diameter of the washer (10) is greater than the diameter of the through hole (7).

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