High-precision double-end bolt

Abstract

The high-precision double-end bolt comprises a supporting body, a first screw rod and a second screw rod are arranged on the upper side and the lower side of the supporting body respectively, the supporting body is of a drum-shaped structure, the middle of the drum-shaped structure protrudes outwards, and the upper end and the lower end of the drum-shaped structure contract inwards. The first threaded rod is provided with a first threaded section, the second threaded rod is provided with a second threaded section, the lower portion of the second threaded rod is provided with a straight rod part, the lower portion of the straight rod part is provided with a nailing part, the diameter of the nailing part is gradually reduced from top to bottom, and the nailing part converges at the bottom end to form a pointed end. The middle supporting main body structure of the double-end bolt can be directly screwed into a component without a threaded hole, connection is stable after the middle supporting main body structure is screwed into the component, the screw on the other side can play a connecting role after the middle supporting main body structure is screwed into the component, and the middle supporting main body structure of the double-end bolt is directly in threaded fit with other components. The strength of the structure can be improved, and breakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a high-precision stud bolt. Background Art

[0002] Stud bolts, also called stud screws or studs, mainly serve as fixed links for connecting machinery. Both ends of the stud bolts are provided with threads for connection. They are generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, tower cranes, large-span steel structures and large buildings.

[0003] The existing stud bolts usually simply set a part of the bare rod section between the two screw rods as the connecting support body, and their defects are: 1. They can only simply connect two parts with threaded holes. When one of the parts does not have a corresponding threaded hole, it cannot be directly driven into the part and nailed; 2. The middle part of the existing stud bolt structure is easy to deform or break when subjected to pressure, and the structural strength is low. Utility Model Content

[0004] In order to solve the above technical problems, the utility model relates to a high-precision stud bolt, which has a simple and reliable structure, effectively solves the above technical problems, and is suitable for popularization and use. In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A high-precision stud bolt comprises a supporting body, wherein a first screw rod and a second screw rod are respectively arranged on the upper and lower sides of the supporting body, the supporting body presents a drum-shaped structure with a middle portion bulging outward and upper and lower ends contracting inward, the first screw rod is provided with a first threaded section, the second screw rod is provided with a second threaded section, a straight rod portion is provided below the second screw rod, a nailing portion is provided below the straight rod portion, the nailing portion gradually decreases in diameter from top to bottom and converges into a tip at the bottom end.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: a first flat washer is provided between the support body and the first screw, the first flat washer is circular and its diameter is larger than the upper surface diameter of the support body, and a second flat washer is provided between the support body and the second screw, the second flat washer is circular and its diameter is larger than the lower surface diameter of the support body.

[0007] On the basis of the above solution and as a preferred solution of the above solution: an introduction transition portion is provided between the second screw rod and the straight rod portion, and the introduction transition portion is a conical structure with a larger upper portion and a smaller lower portion.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the angle between the tip slope of the nail insertion portion and the axis is thirty degrees.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: a third thread segment is provided on the outer side of the straight rod portion, the outer diameter of the third thread segment is smaller than the outer diameter of the second thread segment, the bottom diameter of the third thread segment is smaller than the bottom diameter of the second thread segment, and the pitch of the third thread segment is greater than the pitch of the second thread segment.

[0010] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: the stud bolt designed in the present invention has a pointed nailing portion at one end, so that it can directly penetrate into a component without a threaded hole, and the connection is stable after penetration, and no additional pre-drilling with a tap is required, which simplifies the operation; after penetration, the screw rod on the other side can play a connecting role and directly cooperate with other components through threads; in addition, the middle supporting main structure of the stud bolt has strong deformation and compression resistance, which can improve the strength of the structure and avoid breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the stud bolt;

[0012] Figure 2 It is a structural diagram of embodiment 2. DETAILED DESCRIPTION

[0013] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0014] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0015] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0017] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0018] In order to solve the above technical problems, Figure 1 As shown, this embodiment designs a high-precision stud bolt, including a supporting body 1, wherein a first screw rod 2 and a second screw rod 3 are respectively provided on the upper and lower sides of the supporting body 1, and the supporting body 1 and the first screw rod 2 and the second screw rod 3 are an integrally formed structure. The supporting body 1 is a drum-shaped structure with the middle portion bulging outward and the upper and lower ends contracting inward. The design of the drum-shaped structure can improve its ability to resist lateral pressure, has strong resistance to deformation and compression, can improve the strength of the structure and avoid fracture from the middle.

[0019] The first screw rod 2 is provided with a first threaded section 4, the second screw rod 3 is provided with a second threaded section 5, a straight rod portion 6 is provided below the second screw rod 3, a nailing portion 7 is provided below the straight rod portion 6, the nailing portion 7 gradually decreases in diameter from top to bottom and converges into a tip at the bottom. The stud bolt designed by the utility model has a pointed nailing portion 7 at one end, so that a component without a threaded hole can be directly tapped, and the connection is stable after tapping, and no additional tap is required for pre-drilling, which simplifies the operation. After tapping, the screw rod on the other side can play a connecting role and directly cooperate with other components through threads.

[0020] It is further preferred in this embodiment that a first flat washer 8 is provided between the support body 1 and the first screw rod 2, the first flat washer 8 is circular and its diameter is larger than the upper surface diameter of the support body 1, and a second flat washer 9 is provided between the support body 1 and the second screw rod 3, the second flat washer 9 is circular and its diameter is larger than the lower surface diameter of the support body 1.

[0021] It is further preferred in this embodiment that an introduction transition portion 10 is provided between the second screw rod 3 and the straight rod portion 6. The introduction transition portion 10 is a conical structure that is larger at the top and smaller at the bottom. The introduction transition portion 10 can play a guiding transition role to ensure the smooth entry of the subsequent second thread segment.

[0022] It is further preferred in this embodiment that the angle between the tip bevel of the nail insertion portion 7 and the axis is thirty degrees. Compared with the forty-five degree sharp angle of conventional screws, the tail of this screw is sharper, thereby ensuring smooth insertion of the screw.

[0023] Embodiment 2

[0024] This embodiment further improves upon the above embodiment 1. Figure 2 As shown, a third thread segment 11 is provided on the outer side of the straight rod portion 6 and the striking portion 7, the outer diameter of the third thread segment 11 is smaller than the outer diameter of the second thread segment 3, the bottom diameter of the third thread segment 11 is smaller than the bottom diameter of the second thread segment 3, the pitch of the third thread segment 11 is larger than the pitch of the second thread segment 3, the third thread segment 11 is the first striking segment compared to the second thread segment 3, the third thread segment 11 with smaller outer diameter and bottom diameter is easier to strike, and after striking to a certain extent, it transitions to the second thread segment 3. At this time, the contact area between the screw and the material increases, so that the stability after striking is gradually improved, which can be more stable and will not loosen. In addition, the pitch of the third thread segment 11 is larger, and the sparse thread is easier to strike during the initial striking, and after being transformed into the denser thread of the second thread segment, the stability can be further improved, and the thread disengagement can be avoided.

[0025] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made by technicians in the relevant technical field based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision stud bolt, characterized in that: It includes a supporting body, wherein a first screw and a second screw are respectively provided on the upper and lower sides of the supporting body, and the supporting body is in a drum-shaped structure with a middle portion bulging outward and upper and lower ends contracting inward, the first screw is provided with a first threaded section, the second screw is provided with a second threaded section, a straight rod portion is provided below the second screw, a nailing portion is provided below the straight rod portion, and the nailing portion gradually decreases in diameter from top to bottom and converges into a tip at the bottom end.

2. A high-precision stud bolt according to claim 1, characterized in that: A first flat washer is provided between the support body and the first screw rod, the first flat washer is circular and its diameter is larger than the upper surface diameter of the support body, and a second flat washer is provided between the support body and the second screw rod, the second flat washer is circular and its diameter is larger than the lower surface diameter of the support body.

3. A high-precision stud bolt according to claim 2, characterized in that: An introduction transition portion is provided between the second screw rod and the straight rod portion, and the introduction transition portion is in a conical structure that is larger at the top and smaller at the bottom.

4. A high-precision stud bolt according to claim 3, characterized in that: The angle between the tip slope of the nail insertion portion and the axis is thirty degrees.

5. A high-precision stud bolt according to claim 4, characterized in that: A third thread segment is disposed on the outer side of the straight rod portion, the outer diameter of the third thread segment is smaller than the outer diameter of the second thread segment, the bottom diameter of the third thread segment is smaller than the bottom diameter of the second thread segment, and the pitch of the third thread segment is larger than the pitch of the second thread segment.

Images