Self-locking thin nut for power transmission tower

Abstract

The application provides a self-locking and anti-loosening thin nut for a power transmission tower, which comprises an outer nut and an inner nut; the outer nut is provided with a first threaded hole, an eccentric hole in communication with the first threaded hole and a circular arc groove arranged radially outward relative to the eccentric hole; the inner nut is provided with an eccentric circular truncated cone, a second threaded hole axially penetrating the eccentric circular truncated cone and being eccentric to the eccentric circular truncated cone and a rotating handle extending radially outward along the eccentric circular truncated cone; the first threaded hole and the second threaded hole are of the same screw direction and pitch; the inner nut is embedded in the eccentric hole of the outer nut, and the rotating handle extends radially into the circular arc groove. The self-locking and anti-loosening thin nut can improve the anti-loosening performance of the bolt of the power transmission tower in service, reduce the workload of the operation and maintenance of the power transmission line and improve the operation reliability of the whole life cycle of the power transmission tower.

Description

Technical Field

[0001] The invention relates to the technical field of transmission towers, and in particular to a self-locking and anti-loosening thin nut for transmission towers. Background Art

[0002] Transmission towers currently utilize cold-forged, hot-dip galvanized, hexagonal-head, rough-cut bolts and nuts. Bolted connections are generally reliable when static loads and operating temperatures fluctuate moderately. However, the typical structure of a transmission tower, the iron transmission tower, is subject to long-term environmental influences. Dynamic loads or large temperature fluctuations can cause bolted connections to loosen, reducing or even eliminating the preload. This significantly reduces bolt connection strength, causing some bolts and tower materials to loosen or fall off, leading to structural instability and potentially serious accidents such as tower collapse, posing a direct threat to power grid security. Therefore, reliable bolt loosening prevention measures must be implemented in transmission tower designs.

[0003] At present, the main bolt loosening prevention measures used in transmission towers are spring washers, double nuts, and fastening nuts. Figure 1 、 Figure 2 and Figure 3 As shown in the figure, all of them are friction-locked and require a certain bolt preload. However, due to the inability to ensure that the tightening torque of each bolt reaches the expected value during installation, and the deformation of the bolt connection interface, the bolt preload can easily be reduced or even eliminated. See Table 1 for details.

[0004] Table 1 Common bolt loosening prevention measures for transmission towers

[0005]

[0006] On the towers of the existing transmission lines, anti-loosening measures such as spring washers, double nuts, and tightening nuts are used. The reliability of bolt anti-loosening is not high, especially in windy and waving areas. The bolts of the transmission towers are prone to loosening or falling off. For these transmission towers with easy loosening bolts, other bolt anti-loosening technologies must be used for transformation.

[0007] When installing transmission towers, the construction acceptance standards require that "after the nut is tightened, the length of the bolt exposed from the nut should not be less than 2 pitches for a single nut, and can be flush with the nut for a double nut." Therefore, for transmission towers in operation, the thread length of the exposed part of the bolt is relatively small, and the thickness of existing anti-loosening nuts is generally large, making them unable to be directly installed on the exposed screw. The original nut needs to be removed, which results in a large installation workload. In addition, the bolt may slip during the nut removal process, posing a major safety hazard. Summary of the Invention

[0008] In order to solve the problem that the bolts on the towers of the built transmission lines have low anti-loosening reliability and the bolts may slip during the removal of the nuts, posing a major safety hazard, the present invention proposes a self-locking anti-loosening thin nut for transmission towers, comprising an outer nut and an inner nut;

[0009] The outer nut has a first threaded hole, an eccentric hole eccentrically connected to the first threaded hole, and an arc groove radially outside the eccentric hole;

[0010] The inner nut has an eccentric cone, a second threaded hole axially passing through the eccentric cone and eccentric to the eccentric cone, and a rotating handle extending radially outward along the eccentric cone;

[0011] The first threaded hole and the second threaded hole have the same thread direction and pitch;

[0012] The inner nut is embedded in the eccentric hole of the outer nut, and the rotating handle radially extends into the arc groove.

[0013] Preferably, the height of the inner nut is not greater than the height of the eccentric hole.

[0014] Preferably, the inner nut is partially embedded in the eccentric hole and the arc groove, and the inner nut is exposed to a certain height.

[0015] Preferably, the arc length of the circular arc groove is much greater than the arc length of the rotating handle.

[0016] Based on the same inventive concept, the present invention also provides a method for constructing self-locking and anti-loosening thin nuts for transmission towers, comprising:

[0017] The inner nut is embedded in the eccentric hole of the outer nut, and the rotating handle of the inner nut is arranged in the arc groove;

[0018] The common bolt passes through the connected member, the common nut and the self-locking anti-loosening thin nut in sequence, and the self-locking anti-loosening thin nut is rotated clockwise until the lower end of the inner nut abuts against the common nut;

[0019] The outer nut is rotated in a clockwise direction until the inner nut and the outer nut are axially dislocated and locked with each other.

[0020] Preferably, the outer nut is rotated in a clockwise direction until the inner nut and the outer nut are axially dislocated and locked with each other, comprising:

[0021] The outer nut rotates in a clockwise direction to rotate relative to the inner nut, and the rotating handle of the inner nut slides in the arc groove until the rotating handle abuts against one side of the arc groove and cannot slide further, thereby achieving axial displacement of the inner nut and the outer nut and mutual locking.

[0022] Preferably, the method includes: the outer nut rotates counterclockwise, and the rotating handle of the inner nut slides in the arc groove until the rotating handle abuts against one side of the arc groove and cannot slide further;

[0023] The outer nut rotates in a counterclockwise direction, and the outer nut drives the inner nut to rotate together until the self-locking anti-loosening thin nut is separated from the ordinary bolt, and the disassembly is completed.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a self-locking anti-loosening thin nut for a transmission tower, comprising an outer nut and an inner nut; the outer nut has a first threaded hole, an eccentric hole eccentrically connected to the first threaded hole, and an arc groove radially arranged outward relative to the eccentric hole; the inner nut has an eccentric cone, a second threaded hole axially passing through the eccentric cone and eccentric to the eccentric cone, and a rotating handle radially extending outward along the eccentric cone; the first threaded hole and the second threaded hole have the same thread rotation direction and pitch; the inner nut is embedded in the eccentric hole of the outer nut, and the rotating handle radially extends into the arc groove. The self-locking anti-loosening thin nut provided by the present invention can improve the anti-loosening performance of bolts on in-service transmission towers, reduce the workload of transmission line operation and maintenance, and improve the operational reliability of transmission towers throughout their life cycle.

[0026] 2. The self-locking anti-loosening thin nut provided by the present invention can realize the anti-loosening technical transformation of the bolts of the in-service transmission tower without changing the structure of the transmission tower and with a small installation workload and results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a spring washer in the background technology of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a double nut in the background technology of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the fastening nut in the background technology of the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the self-locking anti-loosening thin nut for a transmission tower according to the present invention;

[0031] Figure 5 It is a schematic cross-sectional view of the self-locking anti-loosening thin nut for a transmission tower according to the present invention;

[0032] Figure 6 Schematic diagram of the overall structure of the outer nut of the present invention;

[0033] Figure 7 Schematic diagram of the cross-sectional structure of the outer nut of the present invention;

[0034] Figure 8 Schematic diagram of the overall structure of the inner nut of the present invention;

[0035] Figure 9 Schematic diagram of the overall cross-sectional structure of the inner nut of the present invention;

[0036] Figure 10 This is a schematic diagram of the overall structure of the self-locking anti-loosening thin nut for installing a transmission tower according to the present invention;

[0037] Figure 11 This is a schematic diagram of the overall structure of the self-locking anti-loosening thin nut for tightening a transmission tower according to the present invention;

[0038] Among them, 1. outer nut; 2. first threaded hole; 3. eccentric hole; 4. arc groove; 5. inner nut; 6. second threaded hole; 7. rotating handle; 8. nut main shaft; 9. nut eccentric shaft; 10. self-locking anti-loosening thin nut; 11. ordinary nut; 12. ordinary bolt; 13. connected components. DETAILED DESCRIPTION

[0039] The invention discloses a self-locking anti-loosening thin nut for a transmission tower. The device can improve the anti-loosening performance of bolts on in-service transmission towers, reduce the workload of transmission line operation and maintenance, and improve the operational reliability of transmission towers throughout their life cycle.

[0040] Example 1

[0041] A self-locking anti-loosening thin nut for a transmission tower, such as Figure 4 and Figure 5 As shown, it includes an outer nut 1 and an inner nut 5; the outer nut 1 has a first threaded hole 2, an eccentric hole 3 eccentrically connected to the first threaded hole 2, and an arc groove 4 radially outside the eccentric hole 3, as shown Figure 6 and Figure 7 The inner nut 5 has an eccentric cone, an axially extending second threaded hole 6 and an eccentric eccentric cone and the eccentric cone and a rotating handle 7 extending radially outward along the eccentric cone, as shown. Figure 8 and Figure 9 As shown, the first threaded hole 2 and the second threaded hole 6 have the same thread direction and pitch. The inner nut 5 is embedded in the eccentric hole 3 of the outer nut 1, and the rotating handle 7 extends radially into the arc groove 4. The eccentric distance between the eccentric hole 3 of the outer nut 1 and the eccentric cone of the inner nut 5 is the distance between the nut main axis 8 and the nut eccentric axis 9.

[0042] The height of the inner nut 5 is not greater than the height of the eccentric hole 3. The inner nut 5 is partially embedded in the eccentric hole 3 and the arc groove 4 and fits tightly. The inner nut 5 is exposed to a certain height. The inner nut 5 and the outer nut 1 become an integrated self-locking anti-loosening thin nut 10. Figure 10 As shown in the figure, the rotating handle 7 of the inner nut 5 is placed in the arc groove 4 of the outer nut 1. The arc groove 4 of the outer nut 1 has an angle of 80 degrees, and the arc length of the arc groove 4 is much longer than the arc length of the rotating handle 7. When the rotating handle 7 of the inner nut 5 is located on one side of the arc groove 4 of the outer nut 1, the first threaded hole 2 of the outer nut 1 and the second threaded hole 6 of the inner nut 5 are concentric.

[0043] Tighten the self-locking anti-loosening nut 10 on the ordinary bolt 12 in a clockwise direction until the lower end of the inner nut 5 contacts the installed ordinary nut 11. At this time, the inner nut 5 is tightened in place and cannot be screwed down any further. Figure 11 As shown, continue to tighten the outer nut 1, the eccentric hole 3 of the outer nut 1 rotates along the axial direction of the inner nut 5, and the rotating handle 7 of the inner nut 5 slides in the arc groove 4 of the outer nut 1. The first threaded hole 2 of the outer nut 1 and the second threaded hole 6 of the inner nut 5 generate a transverse locking force perpendicular to the ordinary bolt 12 due to the axial offset, thereby realizing self-locking of the inner nut 5 and the outer nut 1, and preventing the bolt 12 connection pair from loosening.

[0044] When removing the bolt 12, rotate the self-locking anti-loosening thin nut 10 counterclockwise, the outer nut 1 rotates first, and the rotating handle 7 of the inner nut 5 slides in the arc groove 4 of the outer nut 1 until the rotating handle 7 of the inner nut 5 is located on one side of the arc groove 4 of the outer nut 1. At this time, the first threaded hole 2 of the outer nut 1 and the second threaded hole 6 of the inner nut 5 return to the initial concentric position, and the side of the arc groove 4 of the outer nut 1 drives the rotating handle 7 of the inner nut 5 to rotate, so that the outer nut 1 and the inner nut 5 rotate at the same time, and continue to rotate the self-locking anti-loosening thin nut 10 counterclockwise to loosen the nut and remove it.

[0045] Example 2

[0046] Based on the same inventive concept, the present invention also provides a method for constructing self-locking and anti-loosening thin nuts for transmission towers, comprising:

[0047] The inner nut 5 is embedded in the eccentric hole 3 of the outer nut 1, and the rotating handle 7 of the inner nut 5 is set in the arc groove 4;

[0048] The common bolt 12 passes through the connected component, the common nut 11 and the self-locking anti-loosening thin nut 10 in sequence, and the self-locking anti-loosening thin nut 10 is rotated clockwise until the lower end of the inner nut 5 abuts against the common nut 11;

[0049] The outer nut 1 is rotated in a clockwise direction until the inner nut 5 and the outer nut 1 are axially displaced and locked with each other.

[0050] The outer nut 1 is rotated in a clockwise direction until the inner nut 5 and the outer nut 1 are axially displaced and locked with each other, including:

[0051] The outer nut 1 rotates in the clockwise direction, causing the outer nut 1 and the inner nut 5 to rotate relative to each other, and the rotating handle 7 of the inner nut 5 slides in the arc groove 4 until the rotating handle 7 abuts against one side of the arc groove 4 and cannot slide further, thereby achieving axial displacement of the inner nut 5 and the outer nut 1 and locking them with each other.

[0052] The outer nut 1 rotates counterclockwise, and the rotating handle 7 of the inner nut 5 slides in the arc groove 4 until the rotating handle 7 abuts against one side of the arc groove 4 and cannot slide further;

[0053] The outer nut 1 rotates in the counterclockwise direction, and the outer nut 1 drives the inner nut 5 to rotate together until the self-locking anti-loosening thin nut 10 is separated from the ordinary bolt 12, and the disassembly is completed.

[0054] Example 3

[0055] The present invention also provides a formula for calculating the height of a self-locking anti-loosening thin nut for a transmission tower:

[0056] Total height before tightening: h=h1+h2+c=4.2p;

[0057] Total height after tightening: h = h1 + h2 = 4p. p is the corresponding pitch of the threads of the outer nut 1 and the inner nut 5, and is calculated using the following formula:

[0058] h1=2p

[0059] h2=h1

[0060] h3=h1

[0061] c=p / 5

[0062] Among them, c: exposed height of inner nut 5; h1: height of threaded section of outer nut 1; h2: height of eccentric hole 3 of outer nut 1; h3: height of inner nut 5.

[0063] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A self-locking anti-loosening thin nut for a transmission tower, characterized in that: It comprises an outer nut (1) and an inner nut (5); The outer nut (1) has a first threaded hole, an eccentric hole (3) eccentrically connected to the first threaded hole, and an arc groove (4) radially arranged outside the eccentric hole (3); The inner nut (5) has an eccentric cone, a second threaded hole axially passing through the eccentric cone and eccentric to the eccentric cone, and a rotating handle (7) extending radially outward along the eccentric cone; The first threaded hole and the second threaded hole have the same thread direction and pitch; The inner nut (5) is embedded in the eccentric hole (3) of the outer nut (1), and the rotating handle (7) radially extends into the arc groove (4); The height of the inner nut (5) is not greater than the height of the eccentric hole (3); The inner nut (5) is partially embedded in the eccentric hole (3) and the arc groove (4), and the inner nut (5) is exposed to a certain height; The common bolt (12) passes through the connected component (13), the common nut (11) and the self-locking anti-loosening thin nut (10) in sequence, and the self-locking anti-loosening thin nut (10) is rotated clockwise until the lower end of the inner nut abuts against the common nut (11); The outer nut (1) is rotated in a clockwise direction until the inner nut (5) and the outer nut (1) are axially displaced and locked with each other; The total height of the self-locking anti-loosening thin nut (10) before tightening is: h = h1 + h2 + c = 4.2p; The total height of the self-locking anti-loosening thin nut (10) after tightening is: h = h1 + h2 = 4p; p is the corresponding pitch of the threads of the outer nut (1) and the inner nut (5), and is calculated by the following formula: h1=2p; h2=h1; h3=h1; c=p / 5; Wherein, c: exposed height of the inner nut (5); h1: height of the threaded section of the outer nut (1); h2: height of the eccentric hole (3) of the outer nut (1); h3: height of the inner nut (5).

2. The self-locking anti-loosening thin nut for transmission tower according to claim 1, characterized in that: The arc length of the circular arc groove (4) is much greater than the arc length of the rotating handle (7).

3. A construction method for a self-locking anti-loosening thin nut for a transmission tower as claimed in claim 1 or 2, characterized in that: The outer nut (1) is rotated in a clockwise direction until the inner nut (5) and the outer nut (1) are axially displaced and locked with each other, comprising: The outer nut (1) is rotated in a clockwise direction, so that the outer nut (1) and the inner nut (5) rotate relative to each other, and the rotating handle (7) of the inner nut (5) slides in the circular arc groove (4) until the rotating handle (7) abuts against one side of the circular arc groove (4) and cannot slide further, thereby achieving axial displacement of the inner nut (5) and the outer nut (1) and mutual locking.

4. The construction method of the self-locking anti-loosening thin nut for a transmission tower according to claim 3, characterized in that: include: The outer nut (1) rotates counterclockwise, and the rotating handle (7) of the inner nut (5) slides in the circular arc groove (4) until the rotating handle (7) abuts against one side of the circular arc groove (4) and cannot slide further; The outer nut (1) rotates in a counterclockwise direction, and the outer nut (1) drives the inner nut (5) to rotate together until the self-locking anti-loosening thin nut (10) is separated from the ordinary bolt (12), and the disassembly is completed.

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