Limit bolt and nut assembly

Abstract

This application relates to the field of power grid component equipment technology, specifically to a limit bolt and nut assembly. In use, the bolt, pin, and nut can be installed as a single unit, pre-assembled at the factory, eliminating the need for installers to add cotter pins to the bolts. The pin acts as a limiter, preventing the nut from detaching from the bolt. The annular groove further secures and limits the pin, making it difficult for it to fall out and improving the connection stability. This invention avoids the possibility of forgetting to install cotter pins on the bolts during installation, preventing issues such as unopened, detached, or missing pins.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power grid component equipment, in particular to a limiting bolt and nut assembly. BACKGROUND

[0002] With the rapid development of China's economy, the scale of power grid construction is continuously expanding, the number and mileage of lines are rapidly increasing, and higher requirements are put forward for the fine management level of power transmission equipment. Bolts are often used to connect fittings between overhead transmission lines and between fittings and towers. In order to prevent the bolts from falling off due to vibration of the ground wire during long-term operation, an opening pin needs to be installed on the bolt to prevent the bolt and nut from falling off each other. With the increase of overhead transmission lines and the increase of operation time, the defects of rust and falling of opening pins and closing pins in the lines are increasing. The falling of opening pins and closing pins in the transmission line will lead to serious consequences such as falling of fittings, falling of insulator strings, and falling of ground wires.

[0003] In actual application, since the bolt with pin opening and the opening pin are two components, the construction personnel often forget to install the opening pin during installation, and due to non-standard operation during construction and installation, defects such as unopened, falling out and even missing of the pin are frequently occurred, which increases the line operation and inspection cost and reduces the reliability of power grid operation. SUMMARY

[0004] Therefore, the present application provides a limiting bolt and nut assembly, which can avoid the situation of forgetting to install the opening pin during installation, and can avoid the situation of unopened, falling out and even missing of the pin.

[0005] In a first aspect, the present application provides a limiting bolt and nut assembly, which comprises a bolt, a pin piece and a nut; the screw rod of the bolt is provided with an annular groove; the pin piece is connected to the annular groove; the nut is connected to the screw rod, and the nut is located between the pin piece and the head of the bolt.

[0006] In combination with the first aspect, in a possible implementation manner, the annular groove has an opening, and the pin piece passes through the opening and is wound on the annular groove.

[0007] In combination with the first aspect, in a possible implementation manner, a first size of the annular groove along the length direction of the screw rod is greater than the height of the pin piece, and a second size of the annular groove along the radial direction of the screw rod is any value in the range of 1 / 8 to 1 / 10 of the length of the pin piece.

[0008] In combination with the first aspect, in a possible implementation manner, a difference between the second size and the diameter of the screw rod is any value in the range of 8 to 10 times of the thickness of the pin piece.

[0009] With reference to the first aspect, in a possible implementation manner, the limiting section is connected to one side of the annular groove away from the head of the bolt.

[0010] With reference to the first aspect, in a possible implementation manner, the limiting section is cylindrical, and a diameter of the limiting section is less than or equal to a diameter of the screw rod, and the diameter of the limiting section is greater than or equal to a diameter of the annular groove.

[0011] With reference to the first aspect, in a possible implementation manner, the unfolded shape of the pin piece is trapezoidal, a short side length of the pin piece is greater than or equal to a depth of the opening, a long side length of the pin piece is greater than 5 times a circumference of the annular groove, and the long side length of the pin piece is less than 9 times a circumference of the screw rod.

[0012] With reference to the first aspect, in a possible implementation manner, the pin piece is spirally wound on the annular groove, and a rotation direction of the pin piece spirally wound is the same as a thread direction of the bolt.

[0013] With reference to the first aspect, in a possible implementation manner, the pin piece spirally wound on the annular groove partially protrudes from a thread surface of the screw rod.

[0014] With reference to the first aspect, in a possible implementation manner, the nut comprises a nut guide opening and a main body part, an inner part of the nut guide opening has a first cavity, an inner part of the main body part has a second cavity, the first cavity and the second cavity are in communication with each other, the nut guide opening is located at one side of the main body part facing the head of the bolt, and the first cavity is a tapered cavity, the second cavity is a cylindrical cavity, an inner part of the second cavity has a thread matched with the screw rod, and an opening of the first cavity towards the main body part matches a caliber of the second cavity.

[0015] In use, the bolt, the pin piece and the nut can be integrally installed together, and specifically can be assembled together when leaving the factory, without the need for a construction worker to install an open pin on the bolt again, the pin piece can play a limiting role to avoid the nut from being detached from the bolt. The annular groove can play a fixed limiting role to make the pin piece difficult to be detached and dropped, and improve the connection stability of the pin piece. The present aspect can avoid the situation of forgetting to install an open pin on the bolt during installation, and there is no situation of the pin not being opened, being detached or even being missing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 shows a structure schematic diagram of a limiting bolt nut assembly provided by an embodiment of the present application.

[0017] Figure 2Fig. 6 shows a schematic view of the nut according to another embodiment of the application.

[0018] Figure 3 Fig. 7 shows a schematic view of the nut and the pin according to another embodiment of the application.

[0019] Figure 4 Fig. 8 shows a schematic view of the pin according to another embodiment of the application.

[0020] Figure 5 Fig. 9 shows a schematic view of the nut according to another embodiment of the application.

[0021] Figure 6 Fig. 10 shows a schematic view of the nut according to another embodiment of the application.

[0022] Figure 7 Fig. 11 shows a schematic view of the nut according to another embodiment of the application.

[0023] Figure 8 Fig. 12 shows a schematic view of the limiting bolt and nut assembly according to another embodiment of the application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] The following description is presented to enable any person skilled in the art to practice the application and to combine the various embodiments of the application to its fullest extent. Various modifications, and equivalents are possible, and the various embodiments of the application are intended to cover all such modifications and equivalents. The description is presented in the best mode for practicing the application and of the information needed to make and use the application. The description is not intended to limit the scope of the application, which is defined by the claims, to the specific embodiments presented. The description is presented in the order of the following sections: Introduction, Definitions, Detailed Description, and Claims.

[0026] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the application.

[0027] The reader's attention is directed to all papers and documents made publicly available by the Patent Office and Library of the United States Patent and Trademark Office before the effective filing date of this application. Papers and documents also made publicly available by foreign Patent Offices, law offices and other sources are hereby expressly incorporated by reference into the present disclosure. All documents and references cited herein are hereby expressly incorporated herein by reference in their entirety. Unless otherwise expressly defined herein, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be apparent to one of ordinary skill in the art that various changes and modifications can be made to the application without departing from the scope of the application. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead with reference to the appended claims, along with their full scope of equivalents.

[0028] It is noted that, where used, the terms left, right, front, back, top, bottom, over, under, clockwise and counterclockwise are used only for convenience and are not intended to imply any particular fixed direction. Indeed, they are used to reflect the relative positions and / or orientations between various parts of the object. In addition, the terms "first", "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance.

[0029] In the description of the present application, it is necessary to note that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] It is noted that, where used, further, preferably, further preferably, and more preferably are simple beginnings of another embodiment based on the foregoing embodiment, and the contents after the further, preferably, further preferably, or more preferably are combined with the foregoing embodiment as the complete composition of another embodiment. The combination of several further, preferably, further preferably, or more preferably settings after the same embodiment can form another embodiment.

[0031] The application will be described in detail below with reference to the accompanying drawings and specific embodiments. It is noted that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be understood as limiting the scope of protection of the present application.

[0032] With the rapid development of China's economy, the scale of power grid construction is expanding, the number and mileage of lines are rapidly growing, and the fine management level of power transmission equipment is put forward with higher requirements. The hardware between the overhead transmission line and the hardware and the tower are connected by bolts. In order to prevent the bolts from falling off with the vibration of the ground wire during long-term operation, it is necessary to install a split pin on the bolt to prevent the bolt and nut from falling off. With the increase of overhead transmission lines and the increase of operation time, the corrosion and falling defects of split pins and closed pins in the line are more and more. The falling of split pins and closed pins in the transmission line will cause the hardware to fall, the insulator string to fall, the ground wire to fall and other serious consequences.

[0033] In practical application, since the bolt with split pin and the split pin are two components, the construction personnel often forget to install the split pin during installation, and there are also non-standard operations during construction and installation, which causes the split pin to be not split, to fall out or even missing, increases the line operation and inspection cost, and reduces the reliability of power grid operation.

[0034] Therefore, the application provides a limiting bolt and nut assembly.

[0035] An exemplary limiting bolt and nut assembly is as follows:

[0036] Figure 1 Fig. 1 shows a structural schematic diagram of a limiting bolt and nut assembly provided by an embodiment of the application. Figure 2 Fig. 2 shows a structural schematic diagram when the nut is removed, provided by another embodiment of the application. Figure 3 Fig. 3 shows a structural schematic diagram when both the nut and the pin are removed, provided by another embodiment of the application. The application provides a limiting bolt and nut assembly. In an embodiment, referring to Figs. 1, Figure 1 、 Figure 2 and Figure 3 The limiting bolt and nut assembly comprises a bolt 1, a pin 2 and a nut 3.

[0037] The screw rod 101 of the bolt 1 is provided with an annular groove 11, and the pin 2 is connected to the annular groove 11. The nut 3 is connected to the screw rod 101, and the nut 3 is located between the pin 2 and the head of the bolt 1.

[0038] In application, the bolt 1, the pin 2 and the nut 3 can be integrally installed together, and can be assembled with each other when leaving the factory, so that the construction personnel do not need to install the split pin on the bolt 1. The pin 2 can play a limiting role to prevent the nut 3 from falling off the bolt 1. The annular groove 11 can play a fixing and limiting role to make the pin 2 difficult to fall off and improve the connection stability of the pin 2. In application, the application can avoid forgetting to install the split pin on the bolt during installation, and there is no situation that the split pin is not split, falls out or even missing.

[0039] In an embodiment, referring to Figure 3 , the annular groove 11 has an opening 12, and the pin 2 passes through the opening 12 and winds around the annular groove 11.

[0040] In the application of the embodiment, the opening 12 can prevent the pin 2 from easily falling out, and the winding of the pin 2 around the annular groove 11 can further improve the stability of the connection between the pin 2 and the bolt 1. The windingly installed pin 2 is equivalent to a helical spring sheet, which has a certain elasticity and can make part of the wound pin 2 protrude from the surface of the bolt 1. During the process of screwing the nut 3 into the bolt 1, the pin 2 is compressed inwardly so that the nut 3 can be fitted on the wound pin 2. After the nut 3 passes through the pin 2, the pin 2 springs up to limit the nut 3 from falling out.

[0041] Figure 4 Fig. 2 shows a structure diagram of the pin when it is unfolded according to another embodiment of the present application. In an embodiment, referring to Figure 4 , Figure 4 Fig. 2 shows a structure diagram of the pin when it is unfolded. The first dimension of the annular groove 11 along the length direction of the screw rod 101 is greater than the height of the pin 2, so that the pin can be installed in the annular groove 11. The second dimension of the annular groove 11 along the radial direction of the screw rod 101 is any value in the range of 1 / 8 to 1 / 10 of the length of the pin 2, so that the pin can be wound around the annular groove 11 for 8 to 10 turns, so that the pin 2 is not easy to fall out and overlaps 8 to 10 layers. The pin 2 overlapping 8 to 10 layers has a certain elasticity and is equivalent to a helical spring sheet. The embodiment limits the relative sizes of the annular groove 11 and the pin 2, so that the pin 2 can fit the annular groove 11.

[0042] In an embodiment, referring to Figure 3 , the difference between the second dimension and the diameter of the screw rod 101 is any value in the range of 8 to 10 times the thickness of the pin 2, to limit the radial dimension of the annular groove 11. When the pin 2 is fitted on the annular groove 11, if the windingly installed pin 2 is extruded, the pin 2 can not protrude from the surface of the screw rod 101, so as to facilitate the nut 3 to be fitted into the screw rod 101. After the nut 3 is fitted into the screw rod 101, the extruded pin 2 springs up to limit the nut 3 from falling out of the screw rod 101.

[0043] In an embodiment, as shown in Figure 3 , the limiting bolt nut assembly further includes a limiting section 13 connected to one side of the annular groove 11 away from the head of the bolt 1. In the embodiment, the limiting section 13 can prevent the pin 2 from falling out.

[0044] In one embodiment, the limiting segment 13 is cylindrical, and the diameter of the limiting segment 13 is less than or equal to the diameter of the screw, so that the nut 3 can be smoothly inserted. The diameter of the limiting segment 13 is greater than or equal to the diameter of the annular groove 11, thereby serving to limit the pin 2.

[0045] In one embodiment, such as Figure 4 As shown, the unfolded shape of pin 2 is trapezoidal. The length of the short side of pin 2 is greater than or equal to the depth of the opening 12, the length of the long side of pin 2 is greater than 5 times the circumference of the annular groove 11, and the length of the long side of pin 2 is less than 9 times the circumference of the screw. After pin 2 is wound and installed in the annular groove 11, even if it is compressed too much, the overall thickness of the wound pin will not be too great.

[0046] In one embodiment, the pin 2 is spirally wound around the annular groove 11, and the rotation direction of the spiral winding of the pin 2 is the same as the thread direction of the bolt 1. Based on the winding rotation direction and trapezoidal shape of the pin 2, when the nut 3 is installed into the bolt 1, the rotation of the nut 3 can guide the spirally wound pin 2 to be compressed.

[0047] In one embodiment, a pin 2 spirally wound on an annular groove 11 partially protrudes from the threaded surface of the screw, and the portion of the pin 2 protruding from the threaded surface can prevent the nut 3 from coming off the screw 101.

[0048] Figure 5 The figure shown is a side view of a nut provided in another embodiment of this application. Figure 6 The diagram shown is a top view of a nut provided in another embodiment of this application. Figure 7 The diagram shown is a cross-sectional view of a nut according to another embodiment of this application. In one embodiment, as... Figure 5 , 6 As shown in Figure 7, the nut 3 includes a nut guide opening 31 and a main body portion 32. The nut guide opening 31 has a first cavity inside, and the main body portion 32 has a second cavity inside. The first cavity and the second cavity are interconnected. The nut guide opening 31 is located on the side of the main body portion 32 facing the head of the bolt 1. The first cavity is a conical cavity, and the second cavity is a cylindrical cavity. The second cavity has threads inside and matches the bolt. The opening of the first cavity facing the main body portion 32 matches the diameter of the second cavity.

[0049] In this embodiment, the nut 3, which is composed of a nut guide port 31 and a main body portion 32, allows the nut guide port 31 to gather and accommodate the loose, wound pin 2 during the process of the nut 3 being fitted onto the bolt 1. As the nut 3 is rotated inward to fit into the bolt 1, the loose pin 2 can be gradually compressed. The compressed pin 2 gradually enters the second cavity and passes through the second cavity. Finally, the second cavity reaches the threaded portion of the screw 101 and is matched and screwed into the screw 101.

[0050] Figure 8 Fig. 1 shows a schematic diagram of a bolt and nut assembly in use according to an embodiment of the present application. In some embodiments, the bolt and nut assembly is used in the construction of a tower for an overhead power transmission line. Figure 8 When the present application is applied to the construction of a tower for an overhead power transmission line, the specific operation is as follows: the bolt 1, the pin 2 and the nut 3 are removed as an integrated unit, and the nut 3 is rotated and removed from the bolt 1. Taking the clockwise rotation of the bolt 1 and the nut 3 as an example, the installer first aligns the openings of the tower body 4 and the tower body 5, and aligns the limiting section 13 with the openings of the tower body 4 and the tower body 5. The bolt 1 is then rotated clockwise, and the helically wound pin 2 is compressed to the inside of the annular groove 11 under the pressure of the openings of the tower body 4 and the tower body 5. The position of the pin 2 is entirely through the openings of the tower body 4 and the tower body 5, and the helically wound pin 2 is expanded. The bolt guide opening 31 of the nut 3 is then directed towards the bolt 1, and the bolt 1 is rotated clockwise. The pin 2 is compressed under the action of the bolt guide opening 31, and the pin 2 is guided to the inside of the annular groove 11 when the nut 3 passes through the upper part of the pin 2. The nut 3 reaches the threaded position of the bolt 1 after passing through the pin 2, and the pin 2 is expanded to limit the position of the tower body 4 and the tower body 5. The nut 3 is then further tightened to limit the position of the tower body 4 and the tower body 5 under the action of the bolt 1.

[0051] When the nut 3 is removed, another nut 3 can be used to screw into the bolt 1 on the other side of the nut guide opening 31, so that the pin 2 is compressed to the inside of the annular groove 11. This process is relatively difficult without the assistance of the nut guide opening 31. The original nut 3 is then screwed in the opposite direction to the position of the newly screwed nut 3, so that the two nuts 3 are in contact with each other. The two nuts 3 are then simultaneously screwed out in the opposite direction. When passing through the openings of the tower body 4 and the tower body 5, a nut 3 is first used to screw into the bolt 1 on the other side of the nut guide opening 31, so that the pin 2 is located directly above the pin 2. The flat surface of the nut 3 is then attached to the openings of the tower body 4 and the tower body 5, and the bolt 1 is rotated in the opposite direction to make the pin 2 pass through the openings of the tower body 4 and the tower body 5.

[0052] The basic principles of the present application are described above in conjunction with specific embodiments, but it should be noted that the advantages, benefits and effects mentioned in the present application are only examples and not limitations, and these advantages, benefits and effects cannot be considered as mandatory for each embodiment of the present application. In addition, the above specific details are only for the purpose of example and understanding, and are not intended to limit the present application to the above specific details.

[0053] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagrams. As those skilled in the art will recognize, the devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have", and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably, unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0054] It is also necessary to point out that in the devices, apparatuses and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalents of the present application.

[0055] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0056] The above description is only the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A limit bolt and nut assembly, characterized in that, The bolt (1), the pin (2) and the nut (3) are included. An annular groove (11) is arranged on the screw rod of the bolt (1). The pin (2) is connected to the annular groove (11). The nut (3) is connected to the screw rod, and the nut (3) is located between the pin (2) and the head of the bolt (1). The annular groove (11) has an opening (12), the pin (2) passes through the opening (12) and is wound on the annular groove (11). The unfolded shape of the pin (2) is trapezoidal, the pin (2) is spirally wound on the annular groove (11), and the rotation direction of the pin (2) is the same as the thread direction of the bolt (1). The nut (3) includes: The nut guide opening (31) has a first cavity inside, the main body part (32) has a second cavity inside, and the first cavity and the second cavity are connected to each other. The nut guide opening (31) is located on the side of the main body part (32) facing the head of the bolt (1). The first cavity is a tapered cavity, the second cavity is a cylindrical cavity, the inside of the second cavity has a thread matched with the screw rod, and the opening of the first cavity towards the main body part (32) matches the caliber of the second cavity. The limiting bolt and nut assembly further includes: The limiting section (13) is connected to the side of the annular groove (11) away from the head of the bolt (1). The limiting section (13) is cylindrical, and the diameter of the limiting section (13) is less than or equal to the diameter of the screw rod. The diameter of the limiting section (13) is greater than or equal to the diameter of the annular groove (11). The part of the pin (2) spirally wound on the annular groove (11) partially protrudes from the thread surface of the screw rod.

2. The limiting bolt and nut assembly according to claim 1, wherein The first dimension of the annular groove (11) along the length direction of the screw rod is greater than the height of the pin (2), and the second dimension of the annular groove (11) along the radial direction of the screw rod is any value in the range of 1 / 8 to 1 / 10 of the length of the pin (2).

3. The limiting bolt and nut assembly according to claim 2, wherein The difference between the second dimension and the diameter of the screw rod is any value in the range of 8 to 10 times the thickness of the pin (2).

4. The stop bolt and nut assembly of claim 1 wherein, The short side length of the pin (2) is greater than or equal to the depth of the opening (12), the long side length of the pin (2) is greater than 5 times the circumference of the annular groove (11), and the long side length of the pin (2) is less than 9 times the circumference of the screw rod.

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