A power transmission tower leg connecting device with self-locking anti-loosening function

Abstract

This invention relates to a transmission tower foot connection device with self-locking and anti-loosening function, belonging to the technical field of transmission towers. It includes a self-locking and anti-loosening component, with a third wedge-shaped inclined surface on the upper surface of the tower foot base plate. A double-ended stud is embedded in the concrete foundation. The first and third wedge-shaped inclined surfaces of the wedge-shaped anti-loosening washer engage. An inner nut presses the washer, and its upper end face has a first ratchet. An outer nut has a second ratchet that engages with it in one direction. An elastic compensation component is located above the outer nut and is pressed by a clamping nut. The wedge angle α between the first and third wedge-shaped inclined surfaces and the wedge angle β between the second wedge-shaped inclined surface and the inner nut's engaging surface satisfy α≠β, forming a self-locking effect. This invention significantly improves the reliability of the tower foot connection by combining unequal wedge angle self-locking, ratchet unidirectional locking, and elastic compensation, along with specialized tools to ensure installation accuracy.

Description

Technical Field

[0001] This invention relates to the field of power transmission tower technology, and in particular to a power transmission tower foot connection device with a self-locking and anti-loosening function. Background Technology

[0002] Transmission towers are critical support structures for power transmission systems, with their bases fixed to concrete foundations via anchor bolts. In outdoor environments, towers are subjected to dynamic excitations such as wind loads, conductor galloping, and ice shedding over long periods. The resulting continuous vibrations are directly transmitted to the connection points at the tower bases, causing thread creep and preload decay in traditional anchor bolt connections (such as single nuts or ordinary double nuts). Ultimately, this leads to loosening or even failure and detachment of the connection, seriously threatening the safe operation of transmission lines.

[0003] To address the technical problem of easy loosening of tower foot connections, various anti-loosening solutions have been proposed by those skilled in the art. (I) Spring washer anti-loosening: Studies have shown that the anti-loosening performance of spring washers is unstable under severe vibration conditions, with a high probability of failure, and the anti-loosening effect is difficult to guarantee under the actual working conditions of transmission tower feet; (II) Double nut anti-loosening: As described in CN201210375076.3, the anti-loosening nut adopts a double anti-loosening structure of elastic ring and wedge, but its anti-loosening level is still limited, and there is a risk of failure under high-frequency vibration environment; (III) Racket anti-loosening double nut solution: For example, the differential ratchet type anti-loosening double nut (CN201910111931.1) adopts ratchet teeth on both the upper and lower nuts. The design with different tooth counts prevents the relative reverse rotation between the two nuts, but its principle is still basically based on increasing friction to prevent loosening. It cannot fundamentally prevent the relative rotation between the two nuts, and it has disadvantages such as complex structure and difficult processing; (iv) Double nut + wedge-type anti-loosening washer solution: such as the space grid structure double-segment high-strength bolt anti-loosening connection node disclosed in CN202010920614.7, which adopts a structure of double nuts and anti-loosening washers. However, when subjected to tensile force, the anti-loosening washer may detach from the connected parts, resulting in a reduction or even disappearance of the preload. It is only suitable for specific application scenarios.

[0004] Furthermore, in the installation of lock nuts, the aforementioned existing technologies generally employ common tools such as ordinary wrenches or pneumatic wrenches. For wedge-shaped and ratchet-shaped lock nuts that require precise pre-tightening, differences in operation by different installers can easily lead to wedge angle fit failure or incomplete ratchet engagement, resulting in a significant reduction in the lock-locking function. In particular, when the lock-locking structure includes multiple nuts (such as inner nuts, outer nuts, and compression nuts) and each nut requires different tightening torques, existing common tools cannot achieve differentiated, stepped torque control, severely affecting the final realization of lock-locking performance.

[0005] In summary, existing tower foot connection technologies for power transmission towers generally suffer from the following defects: the anti-loosening mechanism is singular, and its anti-loosening performance is unstable under long-term wind vibration; there is a lack of dedicated installation tools for multi-nut anti-loosening structures, making it difficult to control the installation accuracy and ensure that the designed anti-loosening effect is fully realized in actual projects; high-performance anti-loosening structures require high precision in installation pre-tightening force, but existing installation methods cannot meet the differentiated and precise torque control requirements. Therefore, there is an urgent need in this field to develop a new tower foot connection scheme with a reliable and coordinated anti-loosening mechanism that can achieve controllable installation accuracy through dedicated installation tools. Summary of the Invention

[0006] This invention provides a transmission tower foot connection device with self-locking anti-loosening function, which effectively solves the technical problems in the prior art, such as the single anti-loosening mechanism, unstable anti-loosening performance under long-term wind vibration, lack of special installation tools for high-performance anti-loosening structures leading to uncontrollable installation accuracy, and inability to meet differentiated precise torque control requirements.

[0007] The solution of the present invention to solve the above-mentioned technical problems is as follows: a transmission tower foot connection device with self-locking and anti-loosening function, including a self-locking and anti-loosening component, which specifically includes: a tower foot base plate, a concrete foundation, a double-ended stud, a wedge-shaped anti-loosening washer, an inner nut, an outer nut, an elastic compensation component, and a compression nut.

[0008] The tower foot plate is fixed to the base of the transmission tower. A third wedge-shaped inclined surface is provided on its upper surface. The lower end of the double-ended stud is pre-embedded and fixed in the concrete foundation, and the upper end passes through the mounting hole on the tower foot plate. The wedge-shaped anti-loosening washer is sleeved on the double-ended stud and located on the upper surface of the tower foot plate. A first wedge-shaped inclined surface is provided on its lower surface, and a second wedge-shaped inclined surface is provided on its upper surface. The first wedge-shaped inclined surface and the third wedge-shaped inclined surface cooperate. The inner nut is threadedly connected to the double-ended stud and presses the wedge-shaped anti-loosening washer. Its lower end face is provided with a mating inclined surface that cooperates with the second wedge-shaped inclined surface, and its upper end face is provided with a first ratchet. The outer nut is threadedly connected to the double-ended stud and located above the inner nut. Its lower end face is provided with a second ratchet that meshes unidirectionally with the first ratchet. The elastic compensation component is sleeved on the double-ended stud and located above the outer nut. The clamping nut is threadedly connected to the double-ended stud and presses the upper end of the elastic compensation component.

[0009] The wedge angle α between the first and third wedge inclined surfaces and the wedge angle β between the second and mating inclined surfaces satisfy α≠β. When α≠β, unequal radial forces are generated between the inner nut and the wedge anti-loosening washer and between the wedge anti-loosening washer and the base plate of the tower foot during the tightening process. This makes it impossible for the entire connection pair to form a balanced radial force system under vibration, thereby generating a self-locking effect. This effectively prevents the threaded connection from loosening on its own due to lateral vibration. Compared with the traditional equal wedge angle design, the unequal wedge angle can convert vibration energy into irreversible frictional energy, significantly improving the reliability of anti-loosening.

[0010] The continuous axial elastic force provided by the elastic compensation component is greater than the maximum dynamic vibration inertial force that the connecting device needs to withstand under the expected operating conditions.

[0011] Furthermore, the wedge angle α is 3°~8° and the wedge angle β is 5°~12°. Limiting α and β to the above-mentioned numerical range can ensure sufficient wedge self-locking effect (avoiding insufficient self-locking force due to too small an angle) and prevent excessive angle from causing tightening difficulties or thread damage. Experiments have shown that when β is 2°~4° larger than α, the anti-loosening effect is optimal and the residual preload retention rate can reach more than 96%.

[0012] Furthermore, the elastic compensation component is one of a disc spring group, a wave spring, or a helical spring. The axial elastic force it provides is greater than the vibration inertial force that the connection system needs to overcome during use. The elastic compensation component forms a continuous axial elastic force between the outer nut and the clamping nut. When the connection pair develops micro-gaps or preload decay due to long-term vibration, this elastic force can compensate in real time and automatically maintain the initial preload state of the connection pair. Since the elastic force is designed to be greater than the maximum expected vibration inertial force, the connection pair is always under pressure no matter how severe the vibration is, and there will be no instantaneous disengagement, fundamentally eliminating the conditions for thread creep.

[0013] The present invention also provides a special installation tool for installing the above-mentioned transmission tower foot connection device. The special installation tool includes: an installation housing, a first sleeve, a second sleeve, a third sleeve, an axial feed mechanism, a drive mechanism, and a torque control module.

[0014] The first sleeve is rotatably disposed within the mounting housing, and its lower end is provided with a first driving part that matches the outer circumferential contour of the outer nut. The second sleeve is coaxially and rotatably disposed within the first sleeve, and its lower end is provided with a second driving part that matches the outer circumferential contour of the inner nut. The third sleeve is coaxially and rotatably disposed within the second sleeve, and its lower end is provided with a third driving part that matches the outer circumferential contour of the clamping nut. The axial feed mechanism includes a telescopic feed assembly and an output rod. The telescopic feed assembly is used to drive the output rod to extend and retract axially along the double-ended stud. The drive mechanism is connected to the axial feed mechanism and is used to drive it to rotate. The torque control module is electrically connected to the drive mechanism and is used to control the first preset torque applied to the inner nut, the second preset torque applied to the outer nut, and the third preset torque applied to the clamping nut, respectively.

[0015] The output rod can be selectively connected to the first sleeve, the second sleeve, or the third sleeve via telescopic transmission; the first preset torque, the second preset torque, and the third preset torque satisfy the following condition: first preset torque < second preset torque < third preset torque.

[0016] The functions and advantages of this technical solution are as follows: the coaxial nested three-layer sleeve structure allows three different nuts to be driven independently in sequence without changing tools at the same installation station, which greatly improves installation efficiency. The axial feed mechanism can quickly switch the driving object between the three sleeves by precisely controlling the extension and retraction length of the output rod. More importantly, the torque control module can strictly follow the stepped process requirements of "minimum torque for the inner nut, medium torque for the outer nut, and maximum torque for the clamping nut" to ensure that the wedge surface is correctly fitted, the ratchet is fully engaged, and the elastic element obtains the best initial compression. This completely eliminates human operation errors and allows the designed anti-loosening performance to be fully transformed into actual engineering results.

[0017] Furthermore, bearings are provided between the first sleeve, the second sleeve, and the third sleeve, allowing them to rotate relatively independently. The rotational movement of each sleeve is isolated by the bearings, ensuring that when one sleeve is driven, the other sleeves will not interfere or generate additional friction. This protects the internal structure of the tool and ensures the accuracy of torque transmission.

[0018] Furthermore, the telescopic feed assembly is a lead screw feed mechanism, including a cylindrical housing, a drive motor disposed within the housing, a lead lever driven by the drive motor, a lead screw nut cooperating with the lead lever, a limiting rod, and a sliding block sliding along the limiting rod. The lead screw nut and the sliding block are fixedly connected to the output rod. The lead screw feed mechanism has the characteristics of smooth transmission, high displacement accuracy, and good self-locking, and can achieve precise control of the telescopic position of the output rod (positioning accuracy can reach ±0.1mm), ensuring that the output rod can reliably engage or disengage with the output end connection part at the top of each sleeve, avoiding misoperation.

[0019] Furthermore, the drive mechanism includes a device housing, a drive motor, and a reducer. The device housing is equipped with a handle. The drive motor drives the axial feed mechanism to rotate through the reducer. The handle facilitates on-site hand operation. The reducer can provide sufficient torque amplification, so that the tool can still output the tightening torque required for the installation of large-size anchor bolts (such as M30 and above) in a compact size (up to 500 N·m or more).

[0020] The present invention also provides an installation method for a transmission tower foot connection device with a self-locking and anti-loosening function. The method uses the aforementioned special installation tool to install the aforementioned self-locking and anti-loosening component, and includes the following steps:

[0021] S1: After the concrete foundation with the pre-embedded double-headed studs is poured and cured, the tower feet of the transmission tower are fixedly connected to the base plate of the tower feet, and the upper end of the double-headed studs passes through the mounting holes of the base plate of the tower feet.

[0022] S2: Place the wedge-shaped anti-loosening washer onto the double-ended stud, so that its first wedge-shaped inclined surface fits against the third wedge-shaped inclined surface of the tower foot plate.

[0023] S3: Screw the inner nut into the double-ended stud, and drive the output rod to connect with the second sleeve through the axial feed mechanism. Start the drive mechanism, and control the torque control module to tighten the inner nut with the first preset torque, so that it cooperates with the inclined surface to press the second wedge-shaped inclined surface of the wedge-shaped anti-loosening washer.

[0024] S4: Screw the outer nut into the double-ended stud, and drive the output rod to connect with the first sleeve through the axial feed mechanism. Start the drive mechanism, and control the torque control module to tighten the outer nut with the second preset torque, so that its second ratchet tooth is fully engaged with the first ratchet tooth of the inner nut in one direction.

[0025] S5: Sequentially install the elastic compensation component and the clamping nut and screw them into the double-ended stud. Drive the output rod through the axial feed mechanism to connect with the third sleeve. Start the drive mechanism and control the clamping nut with the third preset torque under the control of the torque control module, so that it compresses the elastic compensation component to the predetermined elastic deformation amount.

[0026] The function and advantages of this technical solution are as follows: by operating in the order of S1 to S5, each anti-loosening layer is activated in sequence - first, the wedge surface self-locking is established (S2-S3), then the ratchet unidirectional locking is achieved (S4), and finally elastic compensation is applied (S5). The stepped torque control ensures that the pre-tightening force of each step is accurate and reasonably increased, so that the entire anti-loosening system reaches the best cooperative working state.

[0027] Furthermore, in steps S3, S4, and S5, the output rod is driven to extend and retract axially by the axial feed mechanism, so that it sequentially engages with the output end connection parts at the top of the second sleeve, the first sleeve, and the third sleeve, thereby realizing the independent driving and tightening of the inner nut, the outer nut, and the clamping nut, respectively.

[0028] The further feature and advantages of this operation process are as follows: This operation process makes full use of the precise control capability of the axial feed mechanism, realizes the reuse of tools with "one-click switching", avoids the tediousness of frequently changing sleeves, and ensures the accurate matching of the driven object and the preset torque after each switch, which greatly improves the consistency and reliability of installation.

[0029] The beneficial effects of this invention are as follows: This invention provides a transmission tower foot connection device with a self-locking and anti-loosening function, which has the following advantages:

[0030] First, the self-locking anti-loosening component sets the wedge angles α and β between the inner nut and the wedge-shaped anti-loosening washer, and between the wedge-shaped anti-loosening washer and the base plate of the tower foot to satisfy α≠β. This causes unequal radial forces to be generated during the tightening process. Under vibration, a balanced radial force system cannot be formed, thus generating a self-locking effect. This converts vibration energy into irreversible frictional energy, significantly improving the reliability of anti-loosening. When α is 3°~8°, β is 5°~12° and β is 2°~4° larger than α, the residual preload retention rate can reach more than 96%, fundamentally preventing the threaded connection from loosening due to lateral vibration.

[0031] Secondly, the elastic compensation component provides a continuous axial elastic force between the outer nut and the clamping nut. This elastic force is greater than the maximum expected vibration inertial force that the connection system needs to overcome during use. When the connection pair develops micro gaps or preload decay due to long-term vibration, the elastic force can compensate in real time and automatically maintain the initial preload state, so that the connection pair is always under pressure and will not disengage instantaneously, thus completely eliminating the conditions for thread creep.

[0032] Third, the special installation tool adopts a coaxial nested first sleeve, second sleeve and third sleeve structure, which, together with the axial feed mechanism, realizes selective transmission connection between the output rod and different sleeves. At the same installation position, the inner nut, outer nut and clamping nut can be driven independently in sequence without changing tools, which greatly improves the installation efficiency. Bearings are provided between each sleeve to ensure that they rotate relatively independently, avoid interference or additional friction, and ensure the accuracy of torque transmission.

[0033] Fourth, the torque control module can control the first preset torque applied to the inner nut, the second preset torque applied to the outer nut, and the third preset torque applied to the clamping nut, respectively. The three satisfy a stepped relationship where the first preset torque is less than the second preset torque, which is less than the third preset torque. This design ensures that the inner nut is tightened with the minimum torque to ensure the wedge surface fits correctly, the outer nut is tightened with the moderate torque to ensure the ratchet is fully engaged in one direction, and the clamping nut is tightened with the maximum torque to ensure the elastic compensation component obtains the optimal initial compression. This completely eliminates human operation errors and allows the designed anti-loosening performance to be fully translated into actual engineering results.

[0034] Fifth, the axial feed mechanism of the special installation tool adopts a lead screw feed form, which has the characteristics of smooth transmission, high displacement accuracy and good self-locking. The positioning accuracy can reach ±0.1mm, ensuring that the output rod reliably engages or disengages with each sleeve, avoiding misoperation. The drive mechanism is equipped with a reducer and a handle, which is convenient for hand operation on site and can output the tightening torque required for the installation of large-size anchor bolts.

[0035] Sixth, the installation method follows the sequence of first establishing wedge-shaped self-locking, then achieving ratchet unidirectional locking, and finally applying elastic compensation. Combined with stepped torque control, this ensures that the entire anti-loosening system achieves optimal collaborative working state, guaranteeing the consistency and reliability of the installation process. It effectively solves the problem in existing technologies where the anti-loosening function is greatly reduced due to uncontrollable installation precision.

[0036] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a transmission tower foot connection device with self-locking and anti-loosening function according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of a self-locking anti-loosening component in a transmission tower foot connection device with self-locking and anti-loosening function according to an embodiment of the present invention;

[0040] Figure 3 This is a front view of a self-locking anti-loosening component in a transmission tower foot connection device with self-locking and anti-loosening function according to an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the structure of a special installation tool for a transmission tower foot connection device with self-locking and anti-loosening function provided in an embodiment of the present invention;

[0042] Figure 5 A bottom view of the mounting housing in a transmission tower foot connection device with self-locking and anti-loosening function according to an embodiment of the present invention;

[0043] Figure 6 This is a front view of the installation state of a special installation tool for a transmission tower foot connection device with self-locking and anti-loosening function, provided in an embodiment of the present invention.

[0044] The attached diagram lists the components represented by each number as follows:

[0045] 1. Tower foot plate; 101. Third wedge-shaped inclined surface; 2. Concrete foundation; 3. Double-ended stud; 4. Wedge-shaped anti-loosening washer; 401. First wedge-shaped inclined surface; 402. Second wedge-shaped inclined surface; 5. Inner nut; 501. Mating inclined surface; 502. First ratchet; 6. Outer nut; 601. Second ratchet; 7. Elastic compensation component; 8. Compression nut; 9. Mounting housing; 10. First sleeve; 1001. First drive unit; 11. Second sleeve; 1101. Second drive unit 12. Moving part; 13. Third sleeve; 14. Third drive part; 15. Drive mechanism; 16. Device housing; 17. Drive motor; 18. Reducer; 19. Axial feed mechanism; 10. Telescopic feed assembly; 10. Drive motor; 11. Lead screw lever; 12. Lead screw nut; 13. Limiting rod; 14. Sliding block; 15. Output rod; 16. Output end connection part; 17. Torque control module. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-6 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0047] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] Please refer to the following: Figures 1 to 3An embodiment of the present invention provides a transmission tower foot connection device with self-locking and anti-loosening function, including a self-locking and anti-loosening component, which specifically includes: a tower foot base plate 1, a concrete foundation 2, a double-ended stud 3, a wedge-shaped anti-loosening washer 4, an inner nut 5, an outer nut 6, an elastic compensation component 7, and a clamping nut 8.

[0050] The tower foot plate 1 is fixed to the bottom of the tower foot of the transmission tower and serves as a transition component connecting the tower and the foundation. The upper surface of the tower foot plate 1 is provided with a third wedge-shaped inclined surface 101. The lower end of the double-headed stud 3 is pre-embedded and fixed inside the concrete foundation 2, while its upper end passes through the mounting hole opened on the tower foot plate 1 to provide a threaded connection base for the subsequent installation of nuts.

[0051] The wedge-shaped anti-loosening washer 4 is fitted onto the double-ended stud 3 and sits on the upper surface of the tower foot plate 1. The lower surface of the wedge-shaped anti-loosening washer 4 has a first wedge-shaped inclined surface 401, and the upper surface has a second wedge-shaped inclined surface 402. During assembly, the first wedge-shaped inclined surface 401 and the third wedge-shaped inclined surface 101 of the tower foot plate 1 cooperate and fit together.

[0052] The inner nut 5 is threadedly connected to the double-ended stud 3 and presses down the wedge-shaped anti-loosening washer 4. The lower end face of the inner nut 5 is provided with a mating inclined surface 501 that mates with the second wedge-shaped inclined surface 402, and its upper end face is provided with a first ratchet 502. The outer nut 6 is also threadedly connected to the double-ended stud 3 and is located above the inner nut 5. The lower end face of the outer nut 6 is provided with a second ratchet 601. The second ratchet 601 and the first ratchet 502 on the inner nut 5 form a one-way meshing relationship, that is, the two can only rotate in the opposite tightening direction. When loosening in the opposite direction, the ratchets will lock each other.

[0053] The elastic compensation component 7 is sleeved on the double-ended stud 3 and located above the outer nut 6. Finally, the clamping nut 8 is threadedly connected to the double-ended stud 3 and clamps the elastic compensation component 7 from the top.

[0054] As one of the core technical features of this invention, the wedge angle α of the first wedge inclined surface 401 and the third wedge inclined surface 101, and the wedge angle β of the second wedge inclined surface 402 and the mating inclined surface 501 satisfy α≠β. In a preferred embodiment, the wedge angle α is 3°~8° and the wedge angle β is 5°~12°. Experiments have shown that when β is 2°~4° larger than α, the anti-loosening effect is optimal. When α≠β, during the tightening process, unequal radial forces will be generated between the inner nut 5 and the wedge anti-loosening washer 4, and between the wedge anti-loosening washer 4 and the tower foot plate 1. This makes it impossible for the entire connection pair to form a balanced radial force system when subjected to alternating loads such as wind vibration, thereby producing a self-locking effect. Compared with the traditional equal wedge angle design, this unequal wedge angle design can convert harmful vibration energy into irreversible frictional energy, effectively preventing the threaded connection from loosening due to lateral vibration.

[0055] Furthermore, the elastic compensation component 7 can be one of a disc spring group, a wave spring, or a helical spring. Its core design is that the axial elastic force provided by the elastic compensation component 7 is configured to be greater than the maximum expected vibration inertial force that the connection system needs to overcome during use. After assembly, the elastic compensation component 7 forms a continuous axial elastic force between the outer nut 6 and the clamping nut 8. When the connection pair develops micro-gaps or preload decay due to long-term vibration, this elastic force can compensate in real time and automatically maintain the initial preload state of the connection pair. Since the elastic force is always greater than the vibration inertial force, no matter how severe the vibration is, the connection pair is always under pressure and will not disengage instantaneously, thereby fundamentally eliminating the conditions for thread creep.

[0056] Please see Figures 4 to 6 In order to achieve accurate and reliable installation of the above-mentioned high-performance anti-loosening components, the present invention also provides a special installation tool, which includes: an installation housing 9, a first sleeve 10, a second sleeve 11, a third sleeve 12, a drive mechanism 13, an axial feed mechanism 14, and a torque control module 16.

[0057] Specifically, the first sleeve 10 is rotatably disposed within the mounting housing 9, and its lower end is provided with a first drive part 1001 that matches the outer peripheral contour (such as a hexagonal head) of the outer nut 6. The second sleeve 11 is coaxially and rotatably disposed within the first sleeve 10, and its lower end is provided with a second drive part 1101 that matches the outer peripheral contour of the inner nut 5. The third sleeve 12 is coaxially and rotatably disposed within the second sleeve 11, and its lower end is provided with a third drive part 1201 that matches the outer peripheral contour of the clamping nut 8. Preferably, bearings are provided between the first sleeve 10, the second sleeve 11 and the third sleeve 12, so that they can rotate relatively independently from each other, avoiding interference or additional friction to the other sleeves when driving one of the sleeves.

[0058] The axial feed mechanism 14 includes a telescopic feed assembly 1401 and an output rod 1402. The telescopic feed assembly 1401 is used to drive the output rod 1402 to extend and retract precisely along the axial direction of the double-ended stud 3. In a preferred embodiment, the telescopic feed assembly 1401 is a lead screw feed mechanism, specifically including a cylindrical housing, a drive motor 14011 disposed in the housing, a lead lever 14012 driven by the drive motor 14011, a lead screw nut 14013 cooperating with the lead lever 14012, a limiting rod 14014, and a sliding block 14015 sliding along the limiting rod 14014. The lead screw nut 14013 and the sliding block 14015 are fixedly connected to the output rod 1402. This structure has the characteristics of smooth transmission, high displacement accuracy (up to ±0.1mm), and good self-locking.

[0059] The drive mechanism 13 is connected to the axial feed mechanism 14 and is used to drive the whole rotation. Preferably, the drive mechanism 13 includes a device housing 1301, a drive motor 1302 and a reducer 1303. The device housing 1301 is provided with a handle for easy hand operation on site. The drive motor 1302 transmits power to the axial feed mechanism 14 through the reducer 1303.

[0060] The torque control module 16 is electrically connected to the drive mechanism 13 and is used to control the first preset torque applied to the inner nut 5, the second preset torque applied to the outer nut 6, and the third preset torque applied to the clamping nut 8, respectively. The output rod 1402 is selectively connected to the output end connection part 15 at the top of the first sleeve 10, the second sleeve 11, or the third sleeve 12 by extension and retraction. The first preset torque, the second preset torque, and the third preset torque satisfy the following condition: first preset torque < second preset torque < third preset torque. This stepped torque design ensures that the inner nut 5 is tightened with the minimum torque to accurately fit the wedge surface, the outer nut 6 is tightened with a moderate torque to ensure that the ratchet is fully engaged in one direction without destroying the preload of the inner nut, and the clamping nut 8 is tightened with the maximum torque to obtain the optimal initial compression of the elastic compensation component 7.

[0061] The output end connection part (15) is an internal hexagonal socket head or an internal spline socket head; the lower end of the output rod (1402) is fixedly provided with an external hexagonal head or an external spline head that matches the output end connection part (15). The axial feed mechanism (14) drives the output rod (1402) to extend and retract axially, so that the external hexagonal head at its lower end can selectively insert into or exit the internal hexagonal socket head at the top of a sleeve, thereby realizing transmission connection or disconnection.

[0062] Preferably, the engagement length between the output end connection 15 and the lower end of the output rod 1402 is 10mm to 20mm to ensure that the tool will not accidentally detach during operation.

[0063] The following details the specific operation method for installing the self-locking anti-loosening component of the present invention using the aforementioned special installation tool. The method includes the following steps:

[0064] S1: Foundation preparation, pour the concrete foundation 2 with the pre-embedded double-headed studs 3 and cure it to the design strength, fix the tower feet of the transmission tower to the base plate 1, and hoist the base plate 1 so that the upper end of the pre-embedded double-headed studs 3 accurately passes through the installation hole on the base plate 1.

[0065] S2: Install the wedge-shaped anti-loosening washer. Place the wedge-shaped anti-loosening washer 4 onto the double-ended stud 3, and ensure that its first wedge-shaped inclined surface 401 is completely in contact with the third wedge-shaped inclined surface 101 of the tower foot plate 1. Ensure that there are no foreign objects on the contact surface to guarantee the subsequent wedge self-locking effect.

[0066] S3: Install and tighten the inner nut. Manually screw the inner nut 5 into the double-ended stud 3. Then, operate the special installation tool: drive the output rod 1402 to extend through the axial feed mechanism 14, so that it engages with the output end connection part 15 at the top of the second sleeve 11. Start the drive mechanism 13, controlled by the torque control module 16, to tighten the inner nut 5 with the first preset torque, so that it precisely presses the second wedge-shaped inclined surface 402 of the wedge-shaped anti-loosening washer 4 with the inclined surface 501. This step establishes the first-level wedge surface self-locking.

[0067] S4: Install and tighten the outer nut. Manually screw the outer nut 6 into the double-ended stud 3 so that its lower end face is close to the upper end face of the inner nut 5. Drive the output rod 1402 to retract through the axial feed mechanism 14, so that it disengages from the second sleeve 11 and engages with the output end connection part 15 of the first sleeve 10. Start the drive mechanism 13, controlled by the torque control module 16, to tighten the outer nut 6 with the second preset torque (greater than the first preset torque). During the tightening process, the second ratchet 601 of the outer nut 6 and the first ratchet 502 of the inner nut 5 will be completely unidirectionally engaged to form a second-stage ratchet lock. Due to the unidirectional characteristic of the ratchet, the outer nut 6 cannot be rotated in the opposite direction to loosen after tightening.

[0068] S5: Install and tighten the clamping nut. Then, put the elastic compensation component 7 and the clamping nut 8 on in sequence and manually screw them into the double-ended stud 3. Then, drive the output rod 1402 to extend again through the axial feed mechanism 14 so that it engages with the output end connection part 15 at the top of the third sleeve 12. Start the drive mechanism 13, which is controlled by the torque control module 16 to tighten the clamping nut 8 with the third preset torque (maximum torque). The clamping nut 8 moves downward and compresses the elastic compensation component 7 to the predetermined elastic deformation amount, so that it stores enough axial elastic potential energy and establishes the third level of elastic compensation.

[0069] In steps S3, S4, and S5 above, the axial feed mechanism 14 drives the output rod 1402 to engage with the second sleeve 11, the first sleeve 10, and the third sleeve 12 in sequence, realizing independent, precise, and sequential drive tightening of the inner nut 5, the outer nut 6, and the clamping nut 8. The entire installation process does not require changing any tool heads, and the drive object can be switched with one click. With precise step torque control, human operation errors are completely eliminated, ensuring that the designed anti-loosening performance is fully realized in actual engineering.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Content not described in detail in this specification is prior art known to those skilled in the art.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A transmission tower foot connection device with self-locking and anti-loosening function, comprising a self-locking and anti-loosening component, characterized in that, The self-locking anti-loosening assembly includes a tower foot plate (1), a concrete foundation (2), a double-ended stud (3), a wedge-shaped anti-loosening washer (4), an inner nut (5), an outer nut (6), an elastic compensation assembly (7), and a clamping nut (8). The base plate (1) of the tower foot is fixed to the tower foot of the power transmission tower, and a third wedge-shaped inclined surface (101) is provided on its upper surface. The lower end of the double-headed stud (3) is pre-embedded and fixed in the concrete foundation (2), and the upper end passes through the mounting hole on the tower foot plate (1); The wedge-shaped anti-loosening washer (4) is sleeved on the double-headed stud (3) and located on the upper surface of the tower foot plate (1). Its lower surface is provided with a first wedge-shaped inclined surface (401), and its upper surface is provided with a second wedge-shaped inclined surface (402). The first wedge-shaped inclined surface (401) and the third wedge-shaped inclined surface (101) cooperate with each other. The inner nut (5) is threadedly connected to the double-ended stud (3) and presses the wedge-shaped anti-loosening washer (4). Its lower end face is provided with a mating inclined surface (501) that mates with the second wedge-shaped inclined surface (402), and its upper end face is provided with a first ratchet (502). The outer nut (6) is threadedly connected to the double-ended stud (3) and located above the inner nut (5). Its lower end face is provided with a second ratchet (601) that engages unidirectionally with the first ratchet (502). The elastic compensation component (7) is sleeved on the double-ended stud (3) and located above the outer nut (6); The clamping nut (8) is threadedly connected to the double-ended stud (3) and clamps the upper end of the elastic compensation component (7); The wedge angle α between the first wedge-shaped inclined surface (401) and the third wedge-shaped inclined surface (101) and the wedge angle β between the second wedge-shaped inclined surface (402) and the mating inclined surface (501) satisfy α≠β.

2. The transmission tower foot connection device with self-locking and anti-loosening function according to claim 1, characterized in that, The wedge angle α is 3°~8°, and the wedge angle β is 5°~12°.

3. The transmission tower foot connection device with self-locking and anti-loosening function according to claim 1, characterized in that, The elastic compensation component (7) is one of a disc spring group, a wave spring or a helical spring, and the axial elastic force it provides is greater than the vibration inertial force that the connection system needs to overcome during use.

4. A special installation tool for installing the tower foot connection device of any one of claims 1 to 3, characterized in that, It includes a mounting housing (9), a first sleeve (10), a second sleeve (11), a third sleeve (12), an axial feed mechanism (14), a drive mechanism (13), and a torque control module (16). The first sleeve (10) is rotatably disposed inside the mounting housing (9), and its lower end is provided with a first drive part (1001) that matches the outer periphery contour of the outer nut (6). The second sleeve (11) is coaxial and can be rotated relatively independently inside the first sleeve (10), and its lower end is provided with a second drive part (1101) that matches the outer circumferential contour of the inner nut (5). The third sleeve (12) is coaxially and can be rotated relatively independently inside the second sleeve (11), and its lower end is provided with a third drive part (1201) that matches the outer periphery of the clamping nut (8). The axial feed mechanism (14) includes a telescopic feed assembly (1401) and an output rod (1402). The telescopic feed assembly (1401) is used to drive the output rod (1402) to extend and retract along the axial direction of the double-ended stud (3). The drive mechanism (13) is connected to the axial feed mechanism (14) and is used to drive it to rotate; The torque control module (16) is electrically connected to the drive mechanism (13) and is used to control the first preset torque applied to the inner nut (5), the second preset torque applied to the outer nut (6), and the third preset torque applied to the clamping nut (8), respectively. The lower end of the output rod (1402) is provided with an external hexagonal drive head, and the top ends of the first sleeve (10), the second sleeve (11) and the third sleeve (12) are respectively provided with internal hexagonal driven holes. The output rod (1402) can selectively insert its external hexagonal drive head into any internal hexagonal driven hole by telescoping, thereby realizing the transmission connection with the corresponding sleeve. The first preset torque, the second preset torque and the third preset torque satisfy: the first preset torque < the second preset torque < the third preset torque.

5. The special installation tool according to claim 4, characterized in that: Bearings are provided between the first sleeve (10), the second sleeve (11) and the third sleeve (12) so that they can rotate relatively independently.

6. The special installation tool according to claim 4, characterized in that: The telescopic feed assembly (1401) is a lead screw feed mechanism, including a cylindrical housing, a drive motor (14011) disposed inside the housing, a lead lever (14012) driven by the drive motor (14011), a lead screw nut (14013) cooperating with the lead lever (14012), a limiting rod (14014), and a sliding block (14015) sliding along the limiting rod (14014). The lead screw nut (14013) and the sliding block (14015) are fixedly connected to the output rod (1402).

7. The special installation tool according to claim 4, characterized in that: The drive mechanism (13) includes a device housing (1301), a drive motor (1302) and a reducer (1303). The device housing (1301) is provided with a handle. The drive motor (1302) drives the axial feed mechanism (14) to rotate through the reducer (1303).

8. An installation method for a transmission tower foot connection device with self-locking and anti-loosening function, characterized in that, Installing the transmission tower foot connection device according to any one of claims 1 to 3 using the special installation tool according to any one of claims 4 to 7 includes the following steps: S1: After the concrete foundation (2) with the pre-embedded double-headed stud (3) is poured and cured, the tower foot of the power transmission tower is fixedly connected to the tower foot base plate (1), and the upper end of the double-headed stud (3) passes through the mounting hole of the tower foot base plate (1). S2: The wedge-shaped anti-loosening washer (4) is fitted onto the double-ended stud (3) so that its first wedge-shaped inclined surface (401) fits against the third wedge-shaped inclined surface (101) of the tower foot plate (1); S3: Screw the inner nut (5) into the double-ended stud (3), and drive the output rod (1402) to the second sleeve (11) through the axial feed mechanism (14). Start the drive mechanism (13), and control the torque control module (16) to tighten the inner nut (5) with the first preset torque, so that it cooperates with the inclined surface (501) to press the second wedge inclined surface (402) of the wedge anti-loosening washer (4). S4: Screw the outer nut (6) into the double-ended stud (3), and drive the output rod (1402) to be connected to the first sleeve (10) through the axial feed mechanism (14). Start the drive mechanism (13), and control the torque control module (16) to tighten the outer nut (6) with the second preset torque, so that its second ratchet (601) is completely engaged with the first ratchet (502) of the inner nut (5) in one direction. S5: The elastic compensation component (7) and the clamping nut (8) are sequentially fitted and screwed into the double-ended stud (3), and the output rod (1402) is driven to be connected to the third sleeve (12) through the axial feed mechanism (14). The drive mechanism (13) is started, and the clamping nut (8) is tightened by the torque control module (16) with the third preset torque, so that the elastic compensation component (7) is compressed to the predetermined elastic deformation amount.

9. A transmission tower foot connection device with self-locking and anti-loosening function according to claim 8, characterized in that, In steps S3, S4, and S5, the output rod (1402) is driven to extend and retract axially by the axial feed mechanism (14), so that it engages with the output end connection part (15) at the top of the second sleeve (11), the first sleeve (10), and the third sleeve (12) in sequence, thereby realizing the independent driving and tightening of the inner nut (5), the outer nut (6), and the clamping nut (8).

Images