Deep hole screw bolt anti-loose structure capable of accurately determining force and aircraft

Abstract

The application provides a deep-hole screw plug anti-loosening structure and an aircraft. The structure comprises a connecting base body, a fixed base body, a screw sleeve, a screw plug, a stop pin and a pressing screw. The screw sleeve is arranged in a through hole, and the screw sleeve is provided with a screw sleeve slot on an end face away from the fixed base body. The screw plug is arranged in the screw sleeve, and the screw plug is provided with a screw plug slot on an end face away from the fixed base body. The number of the screw plug slots is even. The stop pin is used to be clamped into the screw plug slot and the screw sleeve slot when the screw plug is in abutment with the fixed base body at a preset tightening torque and one screw plug slot is radially coincident with one screw sleeve slot, and locking is performed. The pressing screw is arranged above the screw sleeve and the screw plug and is used to press the stop pin. The technical scheme of the application is used to solve the technical problem that the anti-loosening structure in the prior art cannot simultaneously meet the requirements of anti-loosening, accurate force and detachability in a deep-hole scene.

Description

Technical Field

[0001] This invention relates to the field of bolt anti-loosening technology, and in particular to a deep-hole bolt plug anti-loosening structure and aircraft capable of accurate force determination. Background Technology

[0002] With the advancement of science and technology in processes and materials, modern mechanical structure design technology has made rapid progress. Threaded connections remain the most common and widely used connection method in structural system design. Threaded connections have the following advantages: reliable connection, strong load-bearing capacity, good disassembly for easy installation and maintenance, simple structure for convenient manufacturing, high degree of standardization, good interchangeability, wide applicability, and ease of automated assembly. However, threaded connections are prone to loosening under conditions such as vibration, impact, or temperature changes, affecting the reliability of the connection. To avoid this phenomenon, anti-loosening measures can be implemented through structural design.

[0003] Common thread locking methods can be divided into three categories according to their principles: friction locking, mechanical locking, and permanent locking. Examples are given below.

[0004] Friction-based anti-loosening methods: (1) Double nut anti-loosening method: Two nuts are tightened together, and friction is generated by the axial pressure between the nuts to achieve anti-loosening. (2) Elastic washer anti-loosening method: An elastic washer is used. When the nut is tightened, the elastic deformation of the washer generates a continuous clamping force, which in turn generates friction. Spring washers or disc spring assemblies are commonly used as elastic elements. (3) Self-locking nut: A nylon self-locking nut has a nylon ring embedded inside the nut. When tightened, the nylon ring is interference-fitted with the bolt thread to generate friction and achieve anti-loosening. Metal self-locking nuts achieve anti-loosening by deforming the nut opening to increase the friction between the bolt and the thread. (4) Torque anti-loosening method: By controlling the torque when tightening the bolt, the bolt thread is elastically deformed, increasing the friction between the threads and achieving anti-loosening.

[0005] Mechanical anti-loosening: (1) Cotter pin groove type nut: The bolt part has a pin hole and the nut has a pin groove. After tightening, the cotter pin is inserted and the cotter pin is stuck in the pin groove of the nut to prevent the nut from turning and achieve anti-loosening. (2) Locking washer: By designing a special-shaped washer, the washer structure is bent after the bolt is tightened. At this time, one side of the washer structure is stuck in the structural base, and the other side of the structure is stuck in the nut to achieve mechanical anti-loosening. (3) Locking thread anti-loosening: Locking thread holes are pre-drilled on the bolt or nut structure. After the bolt is tightened, a metal wire is passed through multiple bolts or nuts to tighten them together or to tighten them with the base structure to achieve mechanical anti-loosening.

[0006] Permanent anti-loosening: (1) Punching anti-loosening: After the bolt or nut is tightened, a punch is made at the point where the thread end contacts the substrate to cause local deformation and lock the thread. (2) Threadlocker anti-loosening: Anaerobic threadlocker is used at the threaded connection to lock the thread after curing. The anti-loosening performance is related to the performance of the threadlocker used. (3) Spot welding anti-loosening: After the bolt or nut is connected in place, the bolt or nut is welded to the substrate or thread to achieve permanent anti-loosening.

[0007] Each of the aforementioned anti-loosening methods has its advantages and disadvantages. Some are non-removable but have reliable connections, while others are removable but lack reliability. Some occupy a large amount of structural space, and others are complex to install. Therefore, different anti-loosening methods need to be selected according to different application scenarios. However, when none of the above anti-loosening methods can meet the design requirements, it is necessary to design an anti-loosening method specifically based on the existing structural characteristics. For example, if there is a deep hole that needs to be fitted with a top screw that generates a large preload, and the structure is required to not extend beyond the hole, be removable, and withstand long-term, high-volume vibration and impact environments, commonly used anti-loosening methods cannot adequately meet these requirements. Summary of the Invention

[0008] This invention provides a deep-hole screw plug anti-loosening structure and aircraft with accurate force determination, which can solve the technical problem that the existing anti-loosening structure cannot simultaneously meet the requirements of anti-loosening, accurate force determination and disassembly in deep-hole scenarios.

[0009] According to one aspect of the present invention, a deep-hole screw plug anti-loosening structure capable of accurate force determination is provided, the structure comprising:

[0010] A connecting base is provided, and a through hole of a preset depth is provided on the connecting base. The inner wall of the through hole has a first internal thread.

[0011] The fixed substrate is positioned above or below the connecting substrate in a manner perpendicular to the through hole, and there is a gap between the connecting substrate and the fixed substrate;

[0012] A threaded sleeve has a first external thread on its outer wall and a second internal thread on its inner wall. The sleeve is disposed in a through hole and connected via the engagement of the first external thread and the second internal thread. The end face of the sleeve furthest from the fixed substrate has... Each threaded sleeve has a groove;

[0013] The screw plug has a second external thread on its outer wall. The screw plug is disposed inside the screw sleeve and is connected via the second external thread and the second internal thread. The end face of the screw plug furthest from the fixed substrate has... Each screw plug has a groove, among which... It is an even number;

[0014] The stop pin is used to lock the screw plug when it abuts against the fixed base with a preset tightening torque and when one screw plug groove and one screw sleeve groove radially coincide.

[0015] The pressure screw has a third external thread on its outer wall. The pressure screw is set in the through hole and is located above the screw sleeve and screw plug. The pressure screw is connected to the first internal thread through the third external thread and is used to tighten the stop pin.

[0016] Furthermore, the threaded sleeve and the connecting base are machined into a single structure.

[0017] Furthermore, the threaded sleeve is secured with high-strength, non-removable anaerobic thread-locking adhesive.

[0018] Furthermore, the angular resolution of the structure is .

[0019] Furthermore, the widths of the slots between the stop pin and the plug, as well as the widths of the slots between the stop pin and the sleeve, are clearance fits.

[0020] Furthermore, the screw is secured with a spring washer or a low-strength, removable anaerobic thread-locking adhesive to prevent loosening.

[0021] Furthermore, the stop pin is secured using liquid adhesive.

[0022] Furthermore, the stop pin has a removal component for removing the stop pin when disassembling the anti-loosening structure.

[0023] According to another aspect of the present invention, an aircraft is provided, the aircraft including the deep hole screw plug anti-loosening structure proposed above in the present invention.

[0024] The present invention provides a deep-hole plug anti-loosening structure and a device for accurately controlling the force of the plug. This structure cleverly utilizes the differential method to achieve controllable mechanical locking between the plug and the base. By increasing the resolution, arbitrary angle mechanical locking of the plug can be achieved, allowing for more precise design of the plug's preload. The structure is simple, occupies little space, is easy to operate, provides reliable anti-loosening, has adjustable torque, and can be repeatedly disassembled and assembled. It meets the technical requirements of deep-hole plugs that must both prevent loosening and accurately control force and be removable. It is suitable for deep-hole plugs with strict structural constraints that can accurately control force and prevent loosening. By adjusting the thread specifications, it can be applied to various thread structures of different sizes. The design schemes for special bolts and nuts can also refer to this scheme, which has good application value and promotion prospects. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0026] Figure 1 A cross-sectional view of a deep-hole screw plug anti-loosening structure with accurate force determination according to a specific embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram of the structure of the pressure screw provided according to a specific embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram of the structure of a stop pin according to a specific embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram of the structure of a threaded sleeve according to a specific embodiment of the present invention is shown;

[0030] Figure 5 A schematic diagram of the screw plug provided according to a specific embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram of the installation of the stop pin according to a specific embodiment of the present invention is shown. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] According to a specific embodiment of the present invention, a deep hole screw plug anti-loosening structure with accurate force determination is provided, the structure comprising:

[0036] A connecting base 1 is provided, and a through hole of a preset depth is provided on the connecting base 1. The inner wall of the through hole has a first internal thread.

[0037] The fixed substrate 6 is positioned above or below the connecting substrate 1 in a manner perpendicular to the through hole, and there is a gap between the connecting substrate 1 and the fixed substrate 6.

[0038] The threaded sleeve 4 has a first external thread on its outer wall and a second internal thread on its inner wall. The threaded sleeve 4 is disposed in a through hole and connected via the first external thread and the second internal thread. The end face of the threaded sleeve 4 away from the fixed base 6 has... Each threaded sleeve has a 4a groove;

[0039] The screw plug 5 has a second external thread on its outer wall. The screw plug 5 is disposed inside the screw sleeve 4 and is connected to the screw plug 5 by the second external thread engaging with the second internal thread. The end face of the screw plug 5 away from the fixed base 6 has... Each screw plug has a 5a groove, among which... It is an even number;

[0040] The stop pin 3 is used to lock the screw plug 5 into the overlapping screw plug groove 5a and screw sleeve groove 4a when the screw plug 5 abuts against the fixed base 6 with a preset tightening torque and one screw plug groove 5a and one screw sleeve groove 4a are radially overlapped.

[0041] The pressure screw 2 has a third external thread on its outer wall. The pressure screw 2 is set in the through hole and is located above the screw sleeve 4 and the screw plug 5. The pressure screw 2 is connected to the first internal thread through the third external thread and is used to press the stop pin 3.

[0042] This configuration provides a deep-hole plug anti-loosening structure with accurate force determination. This structure cleverly utilizes the differential method to achieve controllable mechanical locking between the plug and the substrate. By increasing the resolution, arbitrary angle mechanical locking of the plug can be achieved, allowing for more precise design of the plug's preload. The structure is simple, space-saving, easy to operate, reliable in preventing loosening, has adjustable torque, and can be repeatedly disassembled and reassembled. It meets the technical requirements of deep-hole plugs for both anti-loosening, accurate force determination, and disassembly. It is suitable for deep-hole plugs with precise force determination and anti-loosening in situations with strict structural constraints. By adjusting the thread specifications, it can be applied to various thread structures of different sizes. This solution can also be used as a reference for the design of special bolts and nuts, demonstrating good application value and promising prospects. Compared with existing technologies, the technical solution of this invention solves the technical problem that existing anti-loosening structures cannot simultaneously meet the requirements of anti-loosening, accurate force determination, and disassembly in deep-hole scenarios.

[0043] In this embodiment of the invention, the screw plug 5 and the screw sleeve 4 are the main components for tightening and locking the screw. The tops of the screw plug 5 and the screw sleeve 4 have grooves for installation and removal. The groove widths on the screw plug 5 and the screw sleeve 4 are the same. When the screw plug 5 is screwed into the screw sleeve 4 and a suitable preload is applied so that a pair of grooves on the screw plug 5 and the screw sleeve 4 overlap, the screw plug 5 and the screw sleeve 4 can be mechanically locked using these overlapping grooves. Theoretically, when the number of grooves 5a on the screw plug is m and the number of grooves 4a on the screw sleeve is m+1, each rotation of the screw plug 5... The screw plug 5 and the screw sleeve 4 have a groove that overlaps, meaning that the angular resolution of the structure is... As the even number m increases, the angular resolution achieved by the mechanical locking increases, and the selectivity of the preload of the plug 5 increases. By designing a suitable locking resolution, high-precision preload design can be achieved. Furthermore, in practical applications, the plug 5 and the sleeve 4 can be designed with different thread specifications.

[0044] Furthermore, in this embodiment of the invention, when the screw plug 5 and the screw sleeve 4 have a pair of overlapping grooves, a stop pin 3 is inserted into the groove to achieve mechanical locking of the screw plug 5 and the screw sleeve 4. The shape of the stop pin 3 can be determined according to the shape of the groove. The width of the stop pin 3 and the width of the screw plug groove 5a, as well as the width of the stop pin 3 and the screw sleeve groove 4a, are clearance fits. To improve the stability of the stop pin 3, liquid adhesive is used to fix the stop pin 3. In addition, to prevent the screw plug 5 and the screw sleeve 4 from getting stuck when mechanically locking them, a removal component is provided on the stop pin 3 for removing the stop pin 3 when disassembling the anti-loosening structure.

[0045] To improve the reliability of the connection between the threaded sleeve 4 and the connecting base 1, in this embodiment of the invention, the threaded sleeve 4 is fixed with high-strength, non-removable anaerobic thread-locking adhesive, preventing it from loosening. In another embodiment of the invention, the threaded sleeve 4 and the connecting base 1 can also be processed into an integral structure, which can reduce the number of parts and improve the reliability of the structure.

[0046] In addition, in this embodiment of the invention, after the stop pin 3 is installed, the pressure screw 2 is used to press the stop pin 3 to prevent the stop pin 3 from falling out and losing its locking function. In order to further improve the reliability of the pressure screw 2, spring washers or low-strength removable anaerobic thread locking adhesive are used to prevent the pressure screw 2 from loosening, thereby improving the structural reliability while meeting the requirement of removability.

[0047] To gain a further understanding of the present invention, the following description is provided in conjunction with... Figures 1 to 6 The deep hole screw plug anti-loosening structure of the present invention will be described in detail.

[0048] like Figures 1 to 6 As shown, according to a specific embodiment of the present invention, a deep-hole screw plug anti-loosening structure with accurate force determination is provided. This structure is compact in design, simple to operate, and provides precise locking pre-tightening force, enabling reliable locking of the screw plug. The specific assembly process is as follows: First, apply high-strength, non-removable anaerobic thread-locking adhesive to the external thread of the screw sleeve 4. Then, use a flathead screwdriver to install the screw sleeve 4 into the designated position. After the anaerobic thread-locking adhesive has completely cured, proceed to the next step. According to the design parameters, the screw sleeve has 9 slots 4a, and the screw plug has 8 slots 5a. Therefore, the locking angle resolution of the stop pin 3 is... Select the appropriate tightening torque parameters for the screw plug design and proceed to the next step. The screw plug design tightening torque should be within a range. Install the substrate 6 to be fixed into place and wait for it to be secured. Install the screw plug 5. When the screw plug 5 contacts the substrate 6, record the tightening torque parameters. When the tightening torque is within the screw plug design tightening torque range, observe the overlap of the grooves on the screw sleeve 4 and the screw plug 5. If there are overlapping grooves, then perform the locking operation; otherwise, then... Adjust the screw sleeve 4 within the range until the slots overlap, then lock it in place. Insert the stop pin 3 into the overlapping slots and secure it with liquid adhesive to prevent it from coming loose during assembly. Apply low-strength removable anaerobic thread-locking adhesive to the external thread of the slotted screw 2, then screw the slotted screw 2 into the deep hole thread of the connecting base 1 until the slotted screw 2 presses against the stop pin 3. Apply the standard tightening torque corresponding to the thread of the slotted screw 2 to achieve the installation of the removable screw plug in the deep hole. For disassembly, first remove the slotted screw 2, then use a tool to remove the stop pin 3, allowing the screw plug 5 to be removed.

[0049] According to another aspect of the present invention, an aircraft is provided, comprising the deep-hole screw plug anti-loosening structure proposed above. Since the aforementioned deep-hole screw plug anti-loosening structure can meet the technical requirements of both anti-loosening and accurate force determination and removability of deep-hole screw plugs, its application to the anti-loosening of deep-hole screw plugs with strict structural constraints and accurate force determination in aircraft can significantly improve the performance of the aircraft.

[0050] In summary, this invention provides a deep-hole plug anti-loosening structure and a device for accurately controlling the force. This structure cleverly utilizes the differential method to achieve controllable mechanical locking between the plug and the substrate. By increasing the resolution, arbitrary angle mechanical locking of the plug can be achieved, allowing for more precise design of the plug's preload. The structure is simple, space-saving, easy to operate, reliable in preventing loosening, has adjustable torque, and can be repeatedly disassembled and reassembled. It meets the technical requirements of deep-hole plugs for both anti-loosening, accurate force control, and disassembly. It is suitable for deep-hole plugs with strict structural constraints and accurate force control for preventing loosening. By adjusting the thread specifications, it can be applied to various thread structures of different sizes. This solution can also be used as a reference for the design of special bolts and nuts, demonstrating good application value and promising prospects. Compared with existing technologies, the technical solution of this invention solves the technical problem that existing anti-loosening structures cannot simultaneously meet the requirements of anti-loosening, accurate force control, and disassembly in deep-hole scenarios.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deep-hole screw plug anti-loosening structure capable of accurately determining force, characterized in that, The structure includes: A connecting base (1) is provided with a through hole of a preset depth, and the inner wall of the through hole has a first internal thread; The fixed substrate (6) is positioned above or below the connecting substrate (1) in a manner perpendicular to the through hole, and there is a gap between the connecting substrate (1) and the fixed substrate (6). A threaded sleeve (4) has a first external thread on its outer wall and a second internal thread on its inner wall. The threaded sleeve (4) is disposed in the through hole and is connected by the first external thread and the second internal thread. The end face of the threaded sleeve (4) away from the fixed base (6) has... Each threaded sleeve has a groove (4a); A screw plug (5) has a second external thread on its outer wall. The screw plug (5) is disposed inside the screw sleeve (4) and is connected to the second internal thread through the second external thread. The end face of the screw plug (5) away from the fixed base (6) has... Each screw plug has a slot (5a), among which... It is an even number; The stop pin (3) is used to lock the screw plug (5) when it abuts against the fixed base (6) with a preset tightening torque and when one screw plug slot (5a) and one screw sleeve slot (4a) are radially coincident. The pressure screw (2) has a third external thread on its outer wall. The pressure screw (2) is disposed in the through hole and is located above the screw sleeve (4) and the screw plug (5). The pressure screw (2) is connected to the first internal thread through the third external thread and is used to press the stop pin (3).

2. The structure according to claim 1, characterized in that, The threaded sleeve (4) and the connecting base (1) are processed into an integral structure.

3. The structure according to claim 1, characterized in that, The threaded sleeve (4) is fixed with high-strength, non-removable anaerobic thread-locking adhesive.

4. The structure according to any one of claims 1 to 3, characterized in that, The angular resolution of the structure is .

5. The structure according to claim 4, characterized in that, The widths of the stop pin (3) and the slot (5a) of the screw plug, as well as the widths of the stop pin (3) and the slot (4a) of the screw sleeve, are all clearance fits.

6. The structure according to claim 5, characterized in that, The pressure screw (2) is secured with a spring pad or low-strength removable anaerobic thread locking adhesive to prevent loosening.

7. The structure according to claim 6, characterized in that, The stop pin (3) is fixed with liquid adhesive.

8. The structure according to any one of claims 1 to 7, characterized in that, The stop pin (3) has a removal component for removing the stop pin (3) when disassembling the anti-loosening structure.

9. An aircraft, characterized in that, The aircraft includes the deep-hole screw plug anti-loosening structure as described in any one of claims 1 to 8.

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