Hollow bolt

Abstract

The hollow bolt comprises a bolt body, the bolt body is sequentially provided with a screw head part, a polished rod part and a threaded part downwards, hollow parts are arranged in the polished rod part and the threaded part respectively, a side hole part is arranged on the side face of the polished rod part, an inner trapezoidal threaded groove and an oil outlet hole are formed in the screw head part respectively, and a trapezoidal threaded plug is arranged in the inner trapezoidal threaded groove. The screw head part, the polish rod part and the thread part are arranged in the bolt body, the hollow parts are arranged in the polish rod part and the thread part, the side hole part is formed in the side face of the polish rod part, the inner trapezoidal thread groove and the oil outlet hole are formed in the screw head part, and the trapezoidal thread plug is arranged in the inner trapezoidal thread groove. The whole bolt does not need to be loosened for oil extraction, the situation that threads are damaged due to repeated rotation of the whole bolt is avoided, the sealing performance of the bolt is guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a hollow bolt. Background Art

[0002] One type of hollow bolt is an oil-through bolt, which is a hollow bolt. This type of bolt generally has two or four small holes on the side wall of the screw that penetrate the internal axial hollow hole. It is mainly used as a transmission channel for liquid oil, gas, lubricants, etc. When the bolt is installed, it can be filled with oil for lubrication and maintenance to prevent rust. At the same time, it can detect the oil quality problems inside the equipment after long-term use. It also has the functions of diversion, change of direction, and connection and tightening. When the existing oil-through hollow bolts are used to detect the oil quality, the bolts must be twisted to expose the side holes for oil to flow out. After the bolts are repeatedly twisted, the threads are damaged, causing the bolts to loosen and the sealing to deteriorate, shortening the service life of the bolts. Therefore, a hollow bolt is proposed to address the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a hollow bolt to solve the problem raised in the above background.

[0004] In order to solve the above technical problems, the utility model specifically provides the following technical solutions: a hollow bolt, including a bolt body, wherein the bolt body is respectively provided with a screw head, a smooth rod portion, and a threaded portion downwardly in sequence, wherein the smooth rod portion and the threaded portion are both provided with a hollow portion, and a side hole portion is provided on the side of the smooth rod portion, wherein an internal trapezoidal thread groove and an oil outlet hole are respectively provided in the screw head, and a trapezoidal thread plug is provided in the internal trapezoidal thread groove.

[0005] Preferably, the middle portion below the screw head is fixedly connected to the top of the polished rod portion, and the bottom of the polished rod portion is fixedly connected to the threaded portion, and a hollow portion is formed through the polished rod portion and the threaded portion.

[0006] Preferably, the top of the hollow portion is placed at the center of the bottom of the screw head, and the hollow portion is connected to the side hole portion.

[0007] Preferably, the oil outlet hole is placed above the top center of the hollow portion, and the oil outlet hole is communicated with the hollow portion.

[0008] Preferably, the oil outlet hole is placed below the center of the bottom of the internal trapezoidal thread groove, and the oil outlet hole is connected to the internal trapezoidal thread groove.

[0009] Preferably, the oil outlet hole and the upper and lower opening planes are flush with the bottom of the inner trapezoidal thread groove and the top of the hollow portion respectively.

[0010] Preferably, a trapezoidal thread plug is rotatably connected in the internal trapezoidal thread groove, and a cross groove is provided on the top of the trapezoidal thread plug.

[0011] Preferably, there is a distance between the bottom of the trapezoidal thread plug and the bottom of the inner trapezoidal thread groove and the top of the oil outlet hole.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model has a screw head, a polished rod and a threaded part in a bolt body, and hollow parts are provided in the polished rod and the threaded part. At the same time, a side hole part is opened on the side of the polished rod, an inner trapezoidal thread groove and an oil outlet hole are provided in the screw head, and a trapezoidal thread plug is provided in the inner trapezoidal thread groove. By utilizing the trapezoidal thread plug in the screw head, it is no longer necessary to loosen the entire bolt to take out oil, thus avoiding the situation where the thread is damaged due to repeated rotation of the entire bolt, ensuring the sealing of the bolt and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0015] Figure 1 It is an overall schematic diagram of the utility model;

[0016] Figure 2 It is an enlarged schematic diagram of point A of the utility model;

[0017] Figure 3 It is an overall top view schematic diagram of the utility model.

[0018] The reference numerals in the accompanying drawings represent the following:

[0019] 1. Bolt body; 2. Screw head; 21. Internal trapezoidal thread groove; 22. Oil outlet hole; 3. Threaded portion; 4. Polished rod portion; 5. Hollow portion; 6. Side hole portion; 7. Trapezoidal thread plug. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3As shown, the utility model provides a hollow bolt, including a bolt body 1, wherein the bolt body 1 is respectively provided with a screw head 2, a smooth rod portion 4, and a threaded portion 3 in sequence downwardly, wherein the smooth rod portion 4 and the threaded portion 3 are both provided with a hollow portion 5, and a side hole portion 6 is provided on the side of the smooth rod portion 4, an internal trapezoidal thread groove 21 and an oil outlet hole 22 are respectively provided in the screw head 2, and a trapezoidal thread plug 7 is provided in the internal trapezoidal thread groove 21.

[0022] In this embodiment, the top of the polished rod 4 is fixedly connected to the middle portion below the screw head 2 , and the bottom of the polished rod 4 is fixedly connected to the threaded portion 3 , and a hollow portion 5 is formed through the polished rod 4 and the threaded portion 3 .

[0023] A bolt having a smooth shaft portion 4 and a threaded portion 3 forming an integral whole is provided below the screw head portion 2 , a hollow portion 5 is opened in the smooth shaft portion 4 and the threaded portion 3 for penetration, and is sealed by the screw head portion 2 .

[0024] Furthermore, the top of the hollow portion 5 is placed at the center of the bottom of the screw head portion 2 , and the hollow portion 5 is communicated with the side hole portion 6 .

[0025] A plurality of side holes 6 are provided on the side of the polished rod portion 4 and are connected to the hollow portion 5 to facilitate the flow of oil during operation.

[0026] Furthermore, the oil outlet hole 22 is disposed above the top center of the hollow portion 5 , and the oil outlet hole 22 is communicated with the hollow portion 5 .

[0027] Furthermore, the oil outlet hole 22 is disposed below the bottom center of the internal trapezoidal thread groove 21 , and the oil outlet hole 22 is communicated with the internal trapezoidal thread groove 21 .

[0028] Furthermore, the oil outlet hole 22 and the upper and lower opening planes are flush with the bottom of the inner trapezoidal thread groove 21 and the top of the hollow portion 5 respectively.

[0029] An inner trapezoidal thread groove 21 and an oil outlet hole 22 are provided in the screw head portion 2 . The inner trapezoidal thread groove 21 and the hollow portion 5 are connected by the connection of the oil outlet hole 22 .

[0030] Furthermore, the inner trapezoidal thread groove 21 is rotatably connected to the trapezoidal thread plug 7, and a cross groove is provided on the top of the trapezoidal thread plug 7.

[0031] Furthermore, there is a distance between the bottom of the trapezoidal thread plug 7 and the inner bottom of the inner trapezoidal thread groove 21 and the top of the oil outlet hole 22 .

[0032] After the trapezoidal thread plug 7 is arranged in the internal trapezoidal thread groove 21 , the internal trapezoidal thread groove 21 is sealed under normal circumstances due to the tightening of the trapezoidal thread plug 7 .

[0033] Working principle:

[0034] A screw head 2, a smooth rod 4 and a threaded portion 3 are provided in the bolt body 1, and a hollow portion 5 is provided in the smooth rod 4 and the threaded portion 3. At the same time, a side hole portion 6 is opened on the side of the smooth rod 4 to communicate with the hollow portion 5, so that oil can circulate during use. An internal trapezoidal thread groove 21 and an oil outlet hole 22 are provided in the screw head 2. The internal trapezoidal thread groove 21 is communicated with the hollow portion 5 by means of the oil outlet hole 22. A trapezoidal thread plug 7 is provided in the internal trapezoidal thread groove 21. When it is necessary to detect the oil, there is no need to loosen the entire bolt. It is only necessary to apply force to the cross groove above the trapezoidal thread plug 7 to rotate the trapezoidal thread plug 7 toward the bottom of the internal trapezoidal thread groove 21. In this way, a gap will be generated between the side of the trapezoidal thread plug 7 and the inner wall of the internal trapezoidal thread groove 21, and oil can overflow from the gap. After collecting the oil to be detected, the trapezoidal thread plug 7 is rotated in the opposite direction to seal the internal trapezoidal thread groove 21 again.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A hollow bolt, comprising a bolt body (1), characterized in that: The bolt body (1) is provided with a screw head (2), a smooth rod (4), and a threaded portion (3) in sequence downwards; a hollow portion (5) is provided in the smooth rod (4) and the threaded portion (3); a side hole portion (6) is provided on the side of the smooth rod (4); an internal trapezoidal thread groove (21) and an oil outlet hole (22) are provided in the screw head (2); a trapezoidal thread plug (7) is provided in the internal trapezoidal thread groove (21).

2. The hollow bolt according to claim 1, characterized in that: The middle part below the screw head (2) is fixedly connected to the top of the polished rod (4), and the bottom of the polished rod (4) is fixedly connected to the threaded part (3). At the same time, a hollow part (5) is formed in the polished rod (4) and the threaded part (3).

3. The hollow bolt according to claim 2, characterized in that: The top of the hollow portion (5) is placed at the center of the bottom of the screw head (2), and the hollow portion (5) is connected to the side hole portion (6).

4. The hollow bolt according to claim 3, characterized in that: The oil outlet hole (22) is disposed above the top center of the hollow portion (5), and the oil outlet hole (22) is communicated with the hollow portion (5).

5. The hollow bolt according to claim 4, characterized in that: The oil outlet hole (22) is disposed below the bottom center of the internal trapezoidal thread groove (21), and the oil outlet hole (22) is communicated with the internal trapezoidal thread groove (21).

6. The hollow bolt according to claim 5, characterized in that: The oil outlet hole (22) and the upper and lower opening planes are flush with the bottom of the inner trapezoidal thread groove (21) and the top of the hollow portion (5) respectively.

7. The hollow bolt according to claim 6, characterized in that: The inner trapezoidal thread groove (21) is rotatably connected to the trapezoidal thread plug (7), and a cross groove is provided on the top of the trapezoidal thread plug (7).

8. The hollow bolt according to claim 7, characterized in that: There is a distance between the bottom of the trapezoidal thread plug (7), the inner bottom of the inner trapezoidal thread groove (21) and the top of the oil outlet hole (22).

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