Pipe joint anti-loosening device

Abstract

The invention discloses a pipe joint anti-loosening device, which belongs to the technical field of locking anti-loosening connecting devices and comprises a support component, a connecting component and a ratchet mechanism. A connecting assembly and a ratchet mechanism are arranged in the support assembly; one end of the support is clamped into a fixing nut at one end of the pipe joint, the other end of the support is clamped into a rotating nut at the other end of the pipe joint, and the two ends of the support assembly can get close to or get away from each other in the axial direction through the connecting assembly. And the ratchet mechanism is used for limiting the support assembly to unidirectionally rotate towards the fastening direction of the pipe joint. The anti-loosening device for the pipe joint effectively prevents the pipe joint from loosening, the ratchet mechanism can be rotated again to apply certain pre-tightening force to the pipe joint, loosening of the joint is further prevented, the anti-loosening device is suitable for later installation of the installed pipe joint, the pipe joint body does not need to be machined or transformed, and the influence on the strength of the pipe joint body is avoided; the device is simple in structure, convenient to install and capable of being repeatedly installed and used.

Description

Technical Field

[0001] The invention relates to the technical field of locking and anti-loosening connection devices, in particular to an anti-loosening device for a pipe joint. Background Art

[0002] In many fields, including industrial production, municipal construction, and civil architecture, pipeline systems serve as the core vehicle for media transport, carrying a variety of media, including liquids, gases, and powders. Their safe and stable operation is directly related to production efficiency, resource utilization, and the safety of people and property. Pipe fittings, as key components for connecting different pipe segments within a pipeline system, are crucial for ensuring the overall sealing and structural integrity of the pipeline. Whether transmitting high-temperature fluids in high-pressure industrial pipelines or circulating media in civil water supply and heating systems, the reliability of pipe fitting connections is paramount in pipeline system design and maintenance.

[0003] However, over long-term use, loosening of pipe fittings remains a significant challenge that hinders the safe operation of pipeline systems. Over time, pipe fittings are susceptible to loosening due to the constant effects of fluid impact, equipment vibration, and ambient temperature fluctuations. This can lead to leakage of media within the pipeline, resulting in not only wasted resources but also potentially serious consequences such as equipment failure and safety accidents. Furthermore, factors such as media corrosion and insufficient installation torque can accelerate the loosening process. Currently, existing pipe fitting anti-loosening technologies have several shortcomings. Locknut anti-loosening technology, which adds a matching locknut to the pipe fitting connection and utilizes the friction between the two nuts to prevent loosening, requires additional threaded structure in the pipe fitting itself, increasing component design complexity, material consumption, and manufacturing costs. Furthermore, the installation and tightening of locknuts requires ample operating space, making them difficult to implement in narrow pipe wells and equipment-intensive areas. Disassembly during maintenance is also challenging, and improper handling can easily damage the threads. Welding fixation technology, in some cases, secures the pipe fitting to the pipeline as a single unit by welding to prevent loosening. However, the welding process will produce a high-temperature heat-affected zone, which will destroy the metal structure of the pipe fitting body, resulting in a significant decrease in its mechanical strength and corrosion resistance, especially for pipe fittings made of high-strength alloys. In addition, the welded pipe fitting cannot be repeatedly disassembled and adjusted. Once local damage occurs, the entire pipe section needs to be replaced, which greatly increases maintenance costs and downtime. Thread sealant anti-loosening technology, this technology applies anaerobic thread sealant to the pipe fitting threads and uses the adhesive force of the cured adhesive layer to prevent loosening. However, its anti-loosening effect is significantly restricted by environmental conditions. In high temperature or high humidity environments, the curing speed and bonding strength of the thread sealant will drop significantly, resulting in anti-loosening failure. Once the thread sealant is completely cured, the removal process requires the use of special solvents and mechanical grinding. Not only is the operation cumbersome, it can also easily damage the thread surface, resulting in the pipe fitting being unable to be reused, which is not in line with the development concept of green environmental protection and resource conservation.

[0004] To sum up, the development of a universal pipe joint anti-loosening device with a simple structure, easy installation, strong versatility, which can not only avoid damage to the pipe joint body and realize repeated disassembly, but also maintain a stable anti-loosening effect under complex working conditions, has become an urgent need to solve the problem of loosening of pipeline systems and improve their safety and reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe joint anti-loosening device to address the above-mentioned shortcomings, solve the problem of pipe joint loosening, and is suitable for later installation of installed pipe joints. It does not require processing or modification of the pipe joint body, avoiding affecting its strength. It has a simple structure, is easy to install, is reusable, and has strong applicability. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A device for preventing a pipe joint from loosening comprises a support assembly, a connecting assembly and a ratchet mechanism; the connecting assembly and the ratchet mechanism are provided inside the support assembly; one end of the support is used to snap into a fixing nut at one end of the pipe joint, and the other end is used to snap into a rotating nut at the other end of the pipe joint; the two ends of the support assembly can move closer to or farther away from each other in the axial direction through the connecting assembly; the ratchet mechanism is used to limit the rotation of the support assembly relative to the pipe joint.

[0006] Furthermore, the support assembly includes a support seat and a limit plate; the support seat and the limit plate are movably connected through a connecting assembly and are coaxially arranged, and the support seat and the limit plate can approach or move away from each other along the axial direction; the support seat is used to clamp the fixing nut at one end of the pipe joint, and the limit plate is used to clamp the rotating nut at the other end of the pipe joint.

[0007] Furthermore, the support seat has an opening on one side away from the limit plate, and a circular hole matching the corresponding position of the pipe joint is provided on the other opposite side; a positioning plate is provided inside the support seat; the positioning plate is rotatably arranged on the inner side of the side with the circular hole through a ratchet mechanism.

[0008] Furthermore, the positioning plate is provided with a first hexagonal hole matching the fixing nut of the pipe joint.

[0009] Furthermore, a second hexagonal hole matching the rotating nut of the pipe joint is formed on the limiting plate.

[0010] Furthermore, the connecting assembly includes a connecting rod; connecting blocks are provided at relative positions on the support seat and the limit plate; a mounting hole is provided on the connecting block on the support seat; a limit block is provided at one end of the connecting rod, and the other end passes through the mounting hole of the connecting block on the support seat and is fixed on the connecting block of the limit plate.

[0011] Furthermore, the connecting assembly also includes a first spring; the first spring is sleeved on the connecting rod between the support seat and the limiting plate.

[0012] Furthermore, the ratchet mechanism includes a ratchet and a pawl assembly; a ratchet is circumferentially provided on the inner side wall of the support seat; the ratchet is located in front of the limit block; and a plurality of pawl assemblies cooperating with the ratchet are provided on the limit block.

[0013] Furthermore, the pawl assembly includes a pawl, a second spring, a fixed shaft and a baffle; a fixed shaft is provided on the positioning plate; a rotatable pawl is sleeved on the fixed shaft; the pawl is engaged with the ratchet; a baffle is provided on the positioning plate on one side of the pawl; and a second spring is provided between the pawl and the baffle.

[0014] Furthermore, the support seat is provided with a cover plate on the side of the opening; the cover plate is provided with a third hexagonal hole matching the fixing nut of the pipe joint.

[0015] The beneficial effects of the present invention are: The present invention discloses a device for preventing a pipe joint from loosening, comprising a support assembly, a connecting assembly and a ratchet mechanism; the support assembly is provided with a connecting assembly and a ratchet mechanism; one end of the support is used to snap into a fixing nut at one end of the pipe joint, and the other end is used to snap into a rotating nut at the other end of the pipe joint, and the two ends of the support assembly can be axially moved closer to or farther away from each other through the connecting assembly; the ratchet mechanism is used to limit the unidirectional rotation of the support assembly in the tightening direction of the pipe joint. The device for preventing a pipe joint from loosening of the present invention effectively prevents the pipe joint from loosening, and the ratchet mechanism can be rotated again to give the pipe joint a certain pre-tightening force to further prevent the joint from loosening. The device is suitable for later installation of an installed pipe joint, and does not require processing or modification of the pipe joint body, thereby avoiding affecting its strength. The device has a simple structure, is easy to install, and can be repeatedly installed and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 3D structural diagram of the anti-loosening device for a pipe joint of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the support base of the present invention, omitting the cover plate; Figure 3 Schematic diagram of the three-dimensional structure of the limiting plate and the connecting assembly of the present invention; Figure 4 3D schematic diagram of the pipe joint anti-loosening device of the present invention installed on the pipe joint; Figure 5 This is a cross-sectional view of the pipe joint anti-loosening device of the present invention installed on the pipe joint; In the accompanying drawings: 1-support seat, 2-limiting plate, 3-round hole, 4-positioning plate, 5-first hexagonal hole, 6-second hexagonal hole, 7-connecting rod, 8-connecting block, 9-limiting block, 10-first spring, 11-ratchet, 12-pawl, 13-second spring, 14-fixed shaft, 15-baffle, 16-cover plate, 17-third hexagonal hole, 18-mounting hole, 19-pipe joint, 20-fixing nut, 21-rotating nut. DETAILED DESCRIPTION

[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0018] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of the stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0019] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0020] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" may encompass both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.

[0021] Example 1: See attached Figures 1 to 5. A device for preventing a pipe joint from loosening, comprising a support assembly, a connecting assembly and a ratchet mechanism. The support assembly is mainly used to be installed on the pipe joint 19, and comprises a support seat 1 and a limit plate 2. The end of the support seat 1 is clamped into the fixing nut 20 at one end of the pipe joint 19, and the end of the limit plate 2 is clamped into the rotating nut 21 at the other end of the pipe joint 19. The support seat 1 and the limit plate 2 are coaxially arranged and movably connected through the connecting assembly. The support seat 1 and the limit plate 2 can only make linear movements toward or away from each other along the axial direction through the connecting assembly. When the support assembly needs to be installed on the pipe joint 19, the support seat 1 is clamped on the fixing nut 20 of the pipe joint 19, the limit plate 2 is moved close to the support seat 1 through the connecting assembly, the rotating nut 21 is tightened on the pipe joint 19, and then the limit plate 2 is moved away from the support seat 1 through the connecting assembly until the limit plate 2 is clamped on the rotating nut 21 of the pipe joint 19. A ratchet mechanism is provided in the support seat 1, which limits the support seat 1 to only rotate in one direction toward the tightening direction of the rotating nut 21, and cannot rotate in the opposite direction. It can be understood that the limit plate 2 connected to the support seat 1 through the connecting assembly can only rotate in one direction toward the tightening direction of the rotating nut 21, and cannot rotate in the opposite direction. Therefore, the rotating nut 21 stuck on the limit plate 2 can only rotate in one direction toward the tightening direction, thereby preventing the pipe joint 19 from loosening. After the support assembly is installed on the pipe joint 19, the support seat 1 can be rotated again toward the tightening direction of the rotating nut 21, and the rotating nut 21 is driven to rotate in the tightening direction again through the limit plate 2, so that the pipe joint 19 generates a certain pre-tightening force, further preventing the pipe joint 19 from loosening. The pipe joint anti-loosening device of the present invention effectively prevents the pipe joint 19 from loosening, and can also rotate the ratchet mechanism again to give the pipe joint 19 a certain pre-tightening force to further prevent the joint from loosening. It is suitable for later installation of an installed pipe joint 19, and there is no need to process or modify the pipe joint 19 body, avoiding affecting its strength. It has a simple structure, is easy to install, and can be installed and used repeatedly.

[0022] Specifically, the specific shapes of the support base 1 and the limiting plate 2 are as shown in the attached Figures 1-3 As shown in the figure, the support seat 1 is cylindrical with a receiving cavity inside. Figure 2 As shown, one side is open, and a circular hole 3 is provided on the side surface of the corresponding other side. The position of the circular hole 3 corresponding to the pipe joint 19 is between the fixing nut 20 and the rotating nut 21. The size of the circular hole 3 should be smaller than the fixing nut 20 and the rotating nut 21 and larger than the size of the corresponding position on the pipe joint 19. A positioning plate 4 is provided on the inner side surface of the side with the circular hole 3. The positioning plate 4 is connected to the inner side surface of the support base 1 through a ratchet mechanism. The positioning plate 4 and the support base 1 can rotate relative to each other in one direction through the ratchet mechanism. A first hexagonal hole 5 is provided on the positioning plate 4 to match the fixing nut 20 of the pipe joint 19. When the support base 1 is installed on the pipe joint 19, the positioning plate 4 is stuck on the fixing nut 20 and is relatively fixed and cannot rotate, which is equivalent to playing a fixing role. As shown in the attached figure Figure 5 It can be seen that the support base 1 is provided with a circular hole 3 on the side and the position of the positioning plate 4 on the pipe joint 19 corresponding to the position of the positioning plate 4. The entire external frame of the support base 1 can be rotated in the tightening direction of the rotating nut 21 through the ratchet mechanism. Similarly, a second hexagonal hole 6 matching the rotating nut 21 of the pipe joint 19 is provided on the limiting plate 2. When the support base 1 is installed on the pipe joint 19, the limiting plate 2 is clamped on the rotating nut 21 through the second hexagonal hole 6. The limiting plate 2 and the support base 1 are connected by a connecting assembly. When the support base 1 rotates in the tightening direction of the rotating nut 21, the limiting plate 2 is driven to rotate in the tightening direction of the rotating nut 21, so as to drive the rotating nut 21 to rotate in the tightening direction again. A cover plate 16 that can rotate relative to the support base 1 is provided at the opening of the support base 1. The cover plate 16 can be set on the side wall of the opening by a retaining spring, or it can be connected with the positioning plate 4 by screws. The specific design and installation can be achieved by using existing technologies, so they are not described here. A third hexagonal hole 17 matching the fixing nut 20 is also provided on the cover plate 16. When the support base 1 is mounted on the pipe joint 19, the cover plate 16 is clamped on the fixing nut 20 and is relatively fixed together with the positioning plate 4 and does not rotate.

[0023] Specifically, the connecting assembly includes a connecting rod 7 and a first spring 10. Connecting blocks 8 are provided at opposite positions on the support seat 1 and the limiting plate 2. Figures 1-3As shown, two connecting blocks 8 can be arranged on the outer side wall of the support base 1, and the two connecting blocks 8 are arranged at the two ends of the symmetry axis of the support base 1, and the corresponding positions on the limiting plate 2 are also provided with the same connecting blocks 8. It can be understood that a plurality of connecting blocks 8 are arranged on the support base 1 along the circumferential direction of the support base 1. The connecting block 8 of the support base 1 is provided with a mounting hole 18, and the size of the mounting hole 18 is larger than the size of the connecting rod 7. The connecting rod 7 is provided with a limiting block 9 at one end, and the other end passes through the mounting hole 18 of the connecting block 8 on the support base 1 and is fixed on the connecting block 8 of the limiting plate 2. It can be fixed on the connecting block 8 of the limiting plate 2 by welding or threaded connection and the like, and rigid connection is realized to ensure that the support base 1 and the limiting plate 2 rotate synchronously. Similarly, the support base 1 and the limiting plate 2 are connected together by the connecting rod 7, and the support base 1 and the limiting plate 2 can move towards or away from each other along the direction of the connecting rod 7. The outer side of the connecting rod 7 between the support base 1 and the limiting plate 2 is also sleeved with a first spring 10. When it is necessary to install the pipe joint anti-loosening device, the support base 1 is first clamped on the fixing nut 20 of the pipe joint 19, the limiting plate 2 is close to the support base 1 and abuts against the support base 1 as much as possible, at this time the first spring 10 is compressed, and then the rotating nut 21 is tightened on the pipe joint 19. After tightening, the limiting plate 2 is released, and the limiting plate 2 will move away from the support base 1 under the action of the first spring 10 until the limiting plate 2 is clamped on the rotating nut 21 of the pipe joint 19. When it is necessary to disassemble the pipe joint 19, the first spring 10 is compressed, the limiting plate 2 is close to the support base 1 and abuts against the support base 1 as much as possible, and is separated from the rotating nut 21. The rotating nut 21 is rotated in the opposite direction and taken off, and the limiting plate 2 is released after being tightened. The pipe joint anti-loosening device can be removed. The connecting assembly realizes quick installation and disassembly of the pipe joint anti-loosening device, and the operation is simple and convenient. It can be reused without the need to process or modify the pipe joint 19 body, and is suitable for late installation after the pipe joint 19 has been installed.

[0024] Specifically, the ratchet mechanism includes a ratchet wheel 11 and a pawl 12 assembly. The ratchet wheel 11 is arranged on the inner side wall of the support base 1 along the circumferential direction, and the ratchet wheel 11 is located in front of the limiting block 9. A plurality of pawl 12 assemblies matched with the ratchet wheel 11 are arranged on the limiting block 9. As shown in the accompanying drawings, the pawl 12 is arranged on the limiting block 9 in a plurality of positions along the circumferential direction of the limiting block 9, and the pawl 12 is matched with the ratchet wheel 11. The pawl 12 is arranged on the limiting block 9 in a plurality of positions along the circumferential direction of the limiting block 9, and the pawl 12 is matched with the ratchet wheel 11. Figure 2As shown, two pawl 12 assemblies can be set on the limit block 9, and the ratchet 11 and the pawl 12 assembly can limit the limit plate 2 to the side of the support seat 1 and can only rotate in one direction relative to the support seat 1. The pawl 12 assembly includes a pawl 12, a second spring 13, a fixed shaft 14 and a baffle 15. A fixed shaft 14 is provided on the positioning plate 4, and a pawl 12 engaged with the ratchet 11 is sleeved on the fixed shaft 14. The pawl 12 can rotate around the fixed shaft 14. A baffle 15 is provided on the positioning plate 4 on one side of the pawl 12. A second spring 13 is provided between the pawl 12 and the baffle 15. The rotation angle of the pawl 12 is limited by the baffle 15 and the second spring 13, and after rotation, it is engaged with the ratchet 11 again through the action of the second spring 13. The support seat 1 is limited to only one-way rotation by the cooperation of the ratchet 11 and the pawl 12. As shown in the attached figure Figure 2 As described above, when the positioning plate 4 is opened on the fixing nut 20 of the pipe joint 19, the support base 1 can only rotate counterclockwise but not clockwise.

[0025] Example 2: The installation process of the anti-loosening device for pipe joints of the present invention is shown in the attached Figure 4 and attached Figure 5 .

[0026] First, clamp the positioning plate 4 of the support seat 1 onto the fixing nut 20 of the pipe joint 19. Then, compress the first spring 10 by external force, so that the limit plate 2 is close to the support seat 1 and contacts the support seat 1 as much as possible. Then, tighten the rotating nut 21 onto the pipe joint 19. After tightening, release the limit plate 2. Under the action of the first spring 10, the limit plate 2 will move away from the support seat 1 until it is clamped on the rotating nut 21 of the pipe joint 19. If the setting direction of the ratchet 11 is as shown in the attached figure, Figure 2 According to the arrangement, after the joint anti-loosening device is installed, the support base 1 can also be rotated counterclockwise. At this time, the positioning plate 4 does not move, and the rotating support base 1 rotates to drive the limiting plate 2 to rotate, which in turn drives the rotating nut 21 to rotate in the tightening direction, so that the pipe joint 19 generates a certain pre-tightening force, further preventing the pipe joint 19 from loosening. When the pipe joint anti-loosening device is installed, it can be seen from the accompanying drawings that the position of the circular hole 3 of the support base 1 corresponding to the pipe joint 19 is between the fixed nut 20 and the rotating nut 21. The positioning plate 4 and the limiting plate 2 of the support base 1 are respectively opened on the fixed nut 20 and the rotating nut 21. Since the size of the circular hole 3 is smaller than the fixed nut 20 and the rotating nut 21, the movement range of the positioning plate 4 and the limiting plate 2 in the axial direction is also limited.

[0027] When the pipe joint 19 needs to be disassembled, the first spring 10 is compressed, the limiting plate 2 is close to the support base 1 and is in contact with the support base 1, the rotary nut 21 is disengaged, the rotary nut 21 is rotated in the reverse direction and is removed, the limiting plate 2 is released after being screwed, and the pipe joint anti-loosening device can be removed. The pipe joint anti-loosening device is quickly installed and disassembled through the connecting assembly, the operation is simple, and the pipe joint anti-loosening device can be repeatedly used. The pipe joint 19 does not need to be processed or modified, and is suitable for late installation.

[0028] All the technical features in the embodiments can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application. The technical, shape and structure parts not described in detail in the present application are well-known technologies.

[0029] The above embodiments are the preferred implementation of the present application, and in addition to this, other ways of implementation are also included, and any obvious replacement without departing from the technical solution concept is within the protection scope of the present application.

Claims

1. A pipe joint anti-loosening device, characterized by: It includes a support assembly, a connecting assembly and a ratchet mechanism; the connecting assembly and the ratchet mechanism are provided inside the support assembly; one end of the support is used to snap into the fixing nut at one end of the pipe joint, and the other end is used to snap into the rotating nut at the other end of the pipe joint, and the two ends of the support assembly can move closer to or farther away from each other along the axial direction through the connecting assembly; the ratchet mechanism is used to limit the rotation of the support assembly relative to the pipe joint.

2. The anti-loosening device for a pipe joint according to claim 1, characterized in that: The support assembly comprises a support seat (1) and a limit plate (2); the support seat (1) and the limit plate (2) are movably connected via a connecting assembly and are coaxially arranged, and the support seat (1) and the limit plate (2) can move closer to or farther away from each other along the axial direction; the support seat (1) is used to snap into a fixing nut at one end of the pipe joint, and the limit plate (2) is used to snap into a rotating nut at the other end of the pipe joint.

3. The anti-loosening device for a pipe joint according to claim 2, characterized in that: The support seat (1) has an opening on one side away from the limiting plate (2), and a circular hole (3) matching the corresponding position of the pipe joint is provided on the other opposite side; a positioning plate (4) is provided inside the support seat (1); the positioning plate (4) is rotatably arranged on the inner side of the side surface provided with the circular hole (3) through a ratchet mechanism.

4. The anti-loosening device for a pipe joint according to claim 3, characterized in that: The positioning plate (4) is provided with a first hexagonal hole (5) that matches the fixing nut of the pipe joint.

5. The anti-loosening device for a pipe joint according to claim 2, characterized in that: The limiting plate (2) is provided with a second hexagonal hole (6) that matches the rotating nut of the pipe joint.

6. The anti-loosening device for a pipe joint according to claim 2, characterized in that: The connecting assembly comprises a connecting rod (7); connecting blocks (8) are provided at relative positions on the support seat (1) and the limiting plate (2); a mounting hole (18) is provided on the connecting block (8) on the support seat (1); one end of the connecting rod (7) is provided with a limiting block (9), and the other end passes through the mounting hole (18) of the connecting block (8) on the support seat (1) and is fixed to the connecting block (8) of the limiting plate (2).

7. The anti-loosening device for a pipe joint according to claim 6, characterized in that: The connecting assembly further comprises a first spring (10); the first spring (10) is sleeved on the connecting rod (7) between the support seat (1) and the limiting plate (2).

8. The anti-loosening device for a pipe joint according to claim 3, characterized in that: The ratchet mechanism comprises a ratchet (11) and a pawl (12) assembly; a ratchet (11) is provided on the inner side wall of the support seat (1) along the circumferential direction; the ratchet (11) is located in front of the limit block (9); and a plurality of pawl (12) assemblies cooperating with the ratchet (11) are provided on the limit plate (2).

9. The anti-loosening device for a pipe joint according to claim 8, characterized in that: The pawl (12) assembly comprises a pawl (12), a second spring (13), a fixed shaft (14) and a baffle (15); the positioning plate (4) is provided with a fixed shaft (14); the fixed shaft (14) is sleeved with a rotatable pawl (12); the pawl (12) is engaged with the ratchet (11); the positioning plate (4) on one side of the pawl (12) is provided with a baffle (15); and a second spring (13) is provided between the pawl (12) and the baffle (15).

10. The anti-loosening device for a pipe joint according to claim 2, characterized in that: The support seat (1) is provided with a cover plate (16) on the side of the opening; the cover plate (16) is provided with a third hexagonal hole (17) that matches the fixing nut of the pipe joint.

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