Length-adjustable stud

Abstract

The length-adjustable stud comprises an upper stud, a lower stud and a reverse-top stud, the upper stud and the lower stud are sequentially arranged from top to bottom, the opposite sections of the upper stud and the lower stud are provided with external threads, the adjacent sections of the upper stud and the lower stud are smooth, and a screw hole penetrating through the top face and the bottom face along the central axis is formed in the upper stud. A screw capable of being screwed into the screw hole upwards is arranged at the top end of the lower stud, the reverse-jacking stud is connected into the screw hole in a threaded mode and can jack the screw downwards, and the length of the double-end bolt can be adjusted by controlling the depth of the screw screwed into the screw hole according to needs. And meanwhile, the reverse jacking stud which is in threaded connection with the interior of the screw hole can synchronously provide downward jacking force for the screw rod so as to force the screw teeth between the upper screw hole and the screw rod to be meshed more tightly, the lower stud is prevented from actively rotating forwards and backwards due to vibration and the like, and finally the phenomenon that the length of the stud is actively changed is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, especially the technical field of stud bolts. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely applied; a stud bolt, also called a double-headed screw or double-headed stud, usually has a smooth rod in the middle and threads at both ends, and is a special fastener, generally applied to fields such as mining machinery, bridges, automobiles, motorcycles, boiler steel structures, tower cranes, long-span steel structures, and large buildings.

[0003] Existing stud bolts are usually integrally designed throughout. For example, an equal-length stud bolt disclosed in the utility model patent with the publication number CN201326629U, a length measuring tool and its length measuring method for a stud bolt disclosed in the invention patent with the publication number CN115540717A, and a stud bolt assembly disclosed in the utility model patent with the publication number CN217898455U; once the thread at one end of such a stud bolt is deformed due to reasons such as wear and corrosion, the entire stud bolt will be scrapped, which is rather wasteful; in addition, since the length of such a stud bolt cannot be adjusted, it is very easy for the exposed thread to be insufficient or even completely unable to reach the connecting component. Summary of the Invention

[0004] The purpose of the utility model is to solve the problems in the prior art and propose a length-adjustable stud bolt that can adjust the total length as required.

[0005] To achieve the above purpose, the utility model proposes a length-adjustable stud bolt, which includes an upper stud, a lower stud, and an anti-top stud. The upper stud and the lower stud are arranged one above the other in sequence, and the opposite segments are provided with external threads while the adjacent segments are smooth. A threaded hole is provided in the upper stud along the central axis through the top surface and the bottom surface. The top end of the lower stud is provided with a screw rod that can be screwed upward into the threaded hole, and the anti-top stud is threadedly connected in the threaded hole and can be tightened downward against the screw rod.

[0006] Preferably, the bottom surface of the lower stud is provided with an internal hexagonal part of the lower stud body, and the top surface of the anti-top stud is provided with an internal hexagonal part of the anti-top stud body.

[0007] Preferably, several glue injection holes penetrating the threaded hole transversely are provided on the surface of the smooth section of the upper stud.

[0008] Preferably, it further includes a spring washer, and the spring washer elastically supports the anti-top stud and the screw rod upward and downward in the threaded hole at the same time.

[0009] Preferably, the spring washer is in the form of a ring with a notch, and in the relaxed state, the two free ends are respectively deflected up and down at the notch.

[0010] Preferably, inner sunk parts are respectively provided on the top surface and the bottom surface of the spring washer, and anti-slip gaskets are respectively installed in the upper and lower inner sunk parts.

[0011] Preferably, anti-slip textures are respectively provided on the top surface of the anti-slip gasket located in the upper layer and the bottom surface of the anti-slip gasket located in the lower layer.

[0012] Advantages of the present utility model:

[0013] 1) By adopting the split upper stud and lower stud as the main body part of the double-headed bolt, and additionally providing a screw hole and a screw rod on the upper stud and the lower stud respectively, the depth of the screw rod screwed into the screw hole can be controlled as required to adjust the length of the double-headed bolt. At the same time, the anti-top stud threadedly connected inside the screw hole can synchronously provide a downward tightening force for the screw rod to force the screw teeth between the upper screw hole and the screw rod to bite more tightly, avoiding the lower stud from actively rotating forward and backward due to vibration or other reasons, and finally preventing the phenomenon that the length of the double-headed bolt changes actively;

[0014] 2) By installing a spring washer with two free ends respectively deflected up and down in the relaxed state between the anti-top stud and the screw rod in the screw hole, the spring washer can synchronously give an elastic anti-top force to the anti-top stud and the screw rod when being flattened, so that while not affecting the anti-loosening effect of the anti-top stud on the lower stud, the anti-top stud can also maintain a more tightly engaged state with the screw hole. Moreover, the anti-slip gaskets with anti-slip textures on both the upper and lower sides of the spring washer can further prevent the anti-top stud and the lower stud from rotating due to the rough contact surface;

[0015] 3) By additionally providing a plurality of glue injection holes respectively penetrating the screw hole horizontally on the surface of the smooth section of the upper stud, glue can be injected between the upper stud and the lower stud through each glue injection hole to strongly fix the length of the double-headed bolt.

[0016] The features and advantages of the present utility model will be described in detail through embodiments in conjunction with the drawings. Description of the Drawings

[0017] Figure 1 is an exploded view of the length-adjustable double-headed bolt of the present utility model;

[0018] Figure 2 is a cross-sectional view of the length-adjustable double-headed bolt of the present utility model;

[0019] Figure 3 is a cross-sectional view of the upper stud of the length-adjustable double-headed bolt of the present utility model;

[0020] Figure 4 It is a cross-sectional view of the lower stud of the double-headed bolt with adjustable length of the present utility model;

[0021] Figure 5 It is a cross-sectional view of the anti-pushing stud of the double-headed bolt with adjustable length of the present utility model;

[0022] Figure 6 It is the front view of the spring washer of the double-headed bolt with adjustable length of the present utility model;

[0023] Figure 7 It is the top view of the spring washer of the double-headed bolt with adjustable length of the present utility model.

[0024] In the figure: 1 - upper stud, 11 - screw hole, 12 - glue injection hole, 2 - lower stud, 21 - screw rod, 22 - internal hexagonal part of the lower cylinder body, 3 - anti-pushing stud, 31 - internal hexagonal part of the anti-pushing cylinder body, 4 - spring washer, 41 - notch, 42 - internal sunken part, 43 - anti-slip gasket. Specific embodiments

[0025] Refer to Figures 1 to 7 , the double-headed bolt with adjustable length of the present utility model includes an upper stud 1, a lower stud 2 and an anti-pushing stud 3. The upper stud 1 and the lower stud 2 are arranged one above the other in sequence, and the opposite segments are provided with external threads while the adjacent segments are smooth. A screw hole 11 penetrating the top surface and the bottom surface along the central axis is provided in the upper stud 1. The top end of the lower stud 2 is provided with a screw rod 21 that can be screwed upward into the screw hole 11, and the anti-pushing stud 3 is threadedly connected in the screw hole 11 and can push down and tighten the screw rod 21.

[0026] The bottom surface of the lower stud 2 is provided with an internal hexagonal part 22 of the lower cylinder body, and the top surface of the anti-pushing stud 3 is provided with an internal hexagonal part 31 of the anti-pushing cylinder body.

[0027] A plurality of glue injection holes 12 penetrating the screw hole 11 horizontally are provided on the surface of the smooth section of the upper stud 1.

[0028] It further includes a spring washer 4, and the spring washer 4 elastically supports the anti-pushing stud 3 and the screw rod 21 up and down simultaneously in the screw hole 11.

[0029] The spring washer 4 is in a ring shape with a notch 41, and in the relaxed state, the two free ends are respectively deflected one above the other at the notch 41.

[0030] The top surface and the bottom surface of the spring washer 4 are respectively provided with internal sunken parts 42, and anti-slip gaskets 43 are respectively installed in the upper and lower internal sunken parts 42.

[0031] Anti-slip textures are respectively provided on the top surface of the anti-slip gasket 43 located in the upper layer and the bottom surface of the anti-slip gasket 43 located in the lower layer.

[0032] Working process of the utility model:

[0033] Before use, the depth of the adjusting screw 21 screwed into the screw hole 11 can be adjusted according to requirements (until the distance between the top end of the upper stud 1 and the bottom end of the lower stud 2 meets the usage requirements); Subsequently, first put the spring washer 4 into the screw hole 11, and then screw the anti-top stud 3 into the screw hole 11 until the anti-top stud 3 indirectly presses against the screw 21 through the spring washer 4.

[0034] In the relaxed state, the two free ends of the spring washer 4 at the notch 41 are skewed one above the other, respectively, while when being propped up by the anti-top stud 3, the two free ends of the spring washer 4 at the notch 41 are flattened on the same horizontal line (the spring washer 4 has an elastic force to prop up the anti-top stud 3 upward and the screw 21 downward at this time).

[0035] In addition, if there is basically no need to adjust the length of the stud bolt in the later stage, glue can also be injected into the screw teeth between the screw hole 11 and the screw 21 along each glue injection hole 12, so as to strengthen the connection strength between the upper stud 1 and the lower stud 2 after the glue solidifies.

[0036] The above embodiments are illustrative of the utility model, not limiting the utility model. Any simple transformation of the utility model belongs to the protection scope of the utility model.

Claims

1. An adjustable-length double-headed bolt, characterized in that: It includes an upper stud (1), a lower stud (2) and an anti-top stud (3). The upper stud (1) and the lower stud (2) are arranged one above the other in sequence, and the opposite segments are provided with external threads while the adjacent segments are smooth. A screw hole (11) running through the top surface and the bottom surface along the central axis is provided in the upper stud (1). The top end of the lower stud (2) is provided with a screw rod (21) that can be screwed upward into the screw hole (11). The anti-top stud (3) is threadedly connected in the screw hole (11) and can press down tightly on the screw rod (21).

2. The length-adjustable double-headed bolt according to claim 1, wherein: The bottom surface of the lower stud (2) is provided with a lower stud internal hexagonal part (22), and the top surface of the anti-top stud (3) is provided with an anti-top stud internal hexagonal part (31).

3. The length-adjustable double-headed bolt according to claim 1, characterized in that: A plurality of glue injection holes (12) horizontally penetrating the screw hole (11) are provided on the surface of the smooth segment of the upper stud (1).

4. The length-adjustable double-headed bolt according to any one of claims 1 to 3, characterized in that: It further includes a spring washer (4). The spring washer (4) elastically supports the anti-top stud (3) and the screw rod (21) up and down simultaneously in the screw hole (11).

5. The length-adjustable double-headed bolt according to claim 4, characterized in that: The spring washer (4) is in the shape of a ring with a notch (41), and in the relaxed state, the two free ends are deflected one above the other at the notch (41).

6. The length-adjustable double-headed bolt according to claim 5, characterized in that: Inner sunk parts (42) are respectively provided on the top surface and the bottom surface of the spring washer (4), and anti-slip gaskets (43) are respectively installed in the upper and lower inner sunk parts (42).

7. The length-adjustable double-headed bolt according to claim 6, wherein: Anti-slip textures are respectively provided on the top surface of the anti-slip gasket (43) located in the upper layer and the bottom surface of the anti-slip gasket (43) located in the lower layer.

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