Bolt looseness indicator

Abstract

The utility model relates to a bolt looseness indicator which comprises a nut sleeve and a pointer, and the pointer is installed on a nut in a bolt pair through the nut sleeve. The defects of an existing marking method are overcome, the nut sleeve of the bolt looseness indicator can exist for a long time, the pointer has the looseness amplification effect, deflection can be obviously seen through the pointer when the nut rotates by a tiny angle, and maintenance personnel can conveniently observe in the distance; and a maintainer can conveniently judge whether the bolt is loosened or not by adopting an unmanned aerial vehicle or other image recognition methods.

Description

Technical Field

[0001] The utility model relates to a bolt loosening indicator and belongs to the technical field of bolt accessories. Background Art

[0002] Bolt connection is widely used in many fields such as electricity, railways, oil and gas pipelines, communication towers, construction machinery, engineering machinery, etc. It is the most commonly used device for mechanical connection. However, in actual application, due to the influence of factors such as vibration, impact or temperature change, bolt connection will become loose, causing great safety hazards to industrial production. For example, once the bolt connection in railway turnouts and contact network systems becomes loose or even detached, it will cause a major safety accident. Although relevant technologies have adopted many measures to prevent bolts from loosening, such as anti-loosening bolts, anti-loosening nuts, anti-loosening washers, etc., there is no good technical means for the operation and maintenance department to determine whether the bolt pair is loose. The observation method often used by maintenance personnel is to draw lines on the nut and the base with a marker pen, and check whether the lines are misaligned at regular intervals to determine whether the bolts are loose. This method is more useful for some bolt pairs installed indoors. For bolt pairs installed outdoors, due to wind, sun and rain, it is difficult for the marking lines to persist. Often the marking lines disappear after a period of time, making it impossible to determine whether the bolts are loose. In addition, the method of drawing marking lines requires maintenance personnel to get close to the bolt pair to observe clearly, which increases the difficulty of maintenance for bolt pairs installed at high altitudes. The utility model solves the problems mentioned in the above background and proposes a bolt loosening indicator, which is used to detect and determine whether the bolt pair is loose. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] In view of the following technical problems in the prior art: the observation method commonly used by maintenance personnel is to draw lines on the nut and the base with a marking pen, and check whether the lines are misaligned at regular intervals to determine whether the bolts are loose. This method is more useful for some bolt pairs installed indoors. For bolt pairs installed outdoors, due to wind, sun and rain, it is difficult for the marking lines to persist for a long time. Often the marking lines disappear after a period of time, making it impossible to determine whether the bolts are loose. Moreover, the method of drawing marking lines requires maintenance personnel to get close to the bolt pair to observe clearly, which increases the difficulty of maintenance for bolt pairs installed at high altitudes.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a bolt loosening indicator, comprising a bolt pair, a nut sleeve and a pointer, wherein the pointer is installed on a nut in the bolt pair through the nut sleeve.

[0006] As an optimal technical solution for a bolt loosening indicator, the nut sleeve includes a nut sleeve body and an external hexagonal mounting boss, the external hexagonal mounting boss is arranged at the lower end of the nut sleeve body, and a cylindrical boss is provided on the side of the external hexagonal mounting boss away from the nut sleeve body.

[0007] As a preferred technical solution for a bolt loosening indicator, the nut sleeve body is cylindrical as a whole, and an internal cavity is opened on the nut sleeve body, and the internal cavity is hexagonal.

[0008] As a preferred technical solution for a bolt loosening indicator, the outer surface of the external hexagonal mounting boss is hexagonal, the cylindrical boss is cylindrical as a whole, and a thread is provided on the outer surface of the cylindrical boss.

[0009] As a preferred technical solution for a bolt loosening indicator, a side wall of the internal cavity is provided with a slot, and inclined surfaces are provided on both sides of the slot.

[0010] The beneficial effects of the utility model: the disadvantages of the existing marking method are overcome, the nut sleeve of the bolt looseness indicator can exist for a long time, the pointer has a looseness magnification effect, and the pointer can clearly show the deflection when the nut is rotated by a small angle, which is convenient for maintenance personnel to observe from a distance; it is convenient for maintenance personnel to use drones or other image recognition methods to determine whether the bolt is loose. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0012] Figure 1 It is a structural schematic diagram of a bolt loosening indicator;

[0013] Figure 2 It is a structural schematic diagram of the nut sleeve;

[0014] Figure 3 It is a schematic diagram of the structure of the internal cavity in the nut sleeve;

[0015] Figure 4 It is a structural schematic diagram of the state in which the nut in the bolt pair is installed in the nut sleeve and rotated 30°;

[0016] Figure 5 It is a structural diagram of the state in which the nut in the bolt pair is inserted into the nut sleeve and locked after being rotated 30°;

[0017] Figure numerals: 1. bolt pair; 2. nut sleeve; 21. nut sleeve body; 211. internal cavity; 2111. inclined surface; 2112. slot; 22. external hexagonal mounting boss; 23. cylindrical boss; 3. pointer. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0021] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0022] like Figures 1 to 5As shown, a bolt loosening indicator includes a nut sleeve 2 and a pointer 3. The nut sleeve 2 and the pointer 3 are both made of modified nylon material, and the color is adjustable. The nut sleeve 2 includes a nut sleeve 2 body and an external hexagonal mounting boss 22, the external hexagonal mounting boss 22 is arranged at the lower end of the nut sleeve 2 body, a cylindrical boss 23 is provided on the side of the external hexagonal mounting boss 2 away from the nut sleeve 2 body, the nut sleeve 2 body is cylindrical as a whole, an internal cavity 211 is provided on the nut sleeve 2 body, the internal cavity 211 is hexagonal, the outer surface of the external hexagonal mounting boss 22 is hexagonal, the cylindrical boss 23 is cylindrical as a whole, and a thread is provided on the outer surface of the cylindrical boss 23. When installing, first put the internal cavity 211 of the nut sleeve 2 on the hexagonal nut, use an internal hexagonal wrench, clamp it on the external hexagonal mounting boss 22 of the nut sleeve 2, and turn it clockwise 30 degrees. After hearing a "click" sound, the nut sleeve 2 is put on the external hexagonal nut and becomes one with the nut.

[0023] Specifically, the side wall of the internal cavity 211 is provided with a slot 2112, and inclined surfaces 2111 are provided on both sides of the slot 2112. The six corners of the nut sleeve 2 slide over the inclined surfaces 2111 to reach the slot 2112. The six corners of the outer surface of the nut sleeve 2 can be wrapped by the slot 2112, thereby locking the nut in the nut sleeve 2.

[0024] The pointer 3 is designed with a collar. When in use, first evenly apply a layer of thread locking glue on the collar, press the cylindrical boss 23 into the collar of the pointer 3, rotate the pointer 3 to a suitable reference position, such as vertically upward, vertically downward, or horizontally left, horizontally right, or a fixed reference point of the object connected by the bolt pair 1, wait for the thread locking glue to harden, and the pointer 3 is installed when the nut sleeve 2 cannot rotate.

[0025] Looseness detection principle: After the bolt looseness indicator is installed, the nut sleeve 2 and the pointer 3 become an integrated structure with the nut of the installed bolt pair 1. When the nut loosens and rotates, the pointer 3 will rotate with it and deviate from the originally set reference point. The pointer 3 amplifies the loosening angle of the nut, and the maintenance personnel can easily identify whether the bolt pair 1 is loose.

[0026] Disassembly: Use an external hexagonal wrench to clamp the external hexagonal mounting boss 22 of the nut sleeve 2, and rotate it 30 degrees clockwise. The bolt loosening indicator can be removed from the nut.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A bolt loosening indicator, characterized in that: The invention comprises a nut sleeve (2) and a pointer (3), wherein the pointer (3) is mounted on a nut in a bolt pair (1) through the nut sleeve (2); the nut sleeve (2) comprises a nut sleeve (2) body and an external hexagonal mounting boss (22), wherein the external hexagonal mounting boss (22) is arranged at the lower end of the nut sleeve (2) body, and a cylindrical boss (23) is provided on the side of the external hexagonal mounting boss (22) away from the nut sleeve (2) body.

2. The bolt loosening indicator according to claim 1, characterized in that: The main body of the nut sleeve (2) is cylindrical as a whole, and an internal cavity (211) is provided on the main body of the nut sleeve (2), and the internal cavity (211) is hexagonal.

3. The bolt loosening indicator according to claim 1, characterized in that: The outer surface of the external hexagonal mounting boss (22) is hexagonal, the cylindrical boss (23) is cylindrical as a whole, and a thread is provided on the outer surface of the cylindrical boss (23).

4. The bolt loosening indicator according to claim 2, characterized in that: A slot (2112) is provided on the side wall of the internal cavity (211), and inclined surfaces (2111) are provided on both sides of the slot (2112).

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