A pipe joint anti-loosening device

Abstract

The utility model discloses a kind of pipe joint anti-loosening devices, belong to locking anti-loosening connecting device technical field, including support assembly, connecting assembly and ratchet mechanism;The support assembly is equipped with connecting assembly and ratchet mechanism in;The fixed nut for being used for clamping into the one end of pipe joint of support one end, the rotating nut for being used for clamping into the other end of pipe joint, support assembly both ends can be mutually close or far away along axial direction by connecting assembly;The ratchet mechanism is used for limiting the one-way rotation of support assembly towards pipe joint fastening direction.The utility model discloses a kind of pipe joint anti-loosening devices effectively prevent the loosening of pipe joint, and also can rotate ratchet mechanism again to give pipe joint certain pre-tightening force, further prevent joint loosening, and applicable to have been installed pipe joint later period and install, without processing or reformation to pipe joint body, avoid the influence to its strength, its structure is simple, convenient to install, can be repeatedly installed and used.

Description

Technical Field

[0001] This utility model relates to the technical field of locking and anti-loosening connection devices, specifically a pipe joint anti-loosening device. Background Technology

[0002] In numerous fields such as industrial production, municipal construction, and civil buildings, pipeline systems serve as the core carriers for media transportation, undertaking the transmission of various media including liquids, gases, and powders. Their safe and stable operation directly impacts production efficiency, resource utilization, and the safety of people and property. Pipe fittings, as key components connecting different pipe sections within a pipeline system, are crucial for ensuring the overall sealing and structural integrity of the pipeline. Whether it's the transmission of high-temperature fluids in high-pressure industrial pipelines or the circulation of media in civil water supply and heating systems, the reliability of pipe fitting connections is paramount in pipeline system design and maintenance.

[0003] However, the loosening of pipe joint connections remains a prominent problem hindering the safe operation of pipeline systems during long-term use. Due to the continuous effects of fluid impact, equipment vibration, and environmental temperature changes, pipe joint connections are prone to loosening during prolonged use, leading to leakage of the medium within the pipeline. This not only wastes resources but may also cause serious consequences such as equipment failure and safety accidents. Furthermore, factors such as medium corrosion and insufficient installation torque can accelerate the loosening process. Currently, existing anti-loosening technologies for pipe joints have several shortcomings: Locking nut anti-loosening technology, which uses a matching locking nut at the pipe joint connection to prevent loosening through friction between the two nuts, requires machining additional threaded structures on the pipe joint body, increasing the design complexity of the parts and raising material consumption and manufacturing costs. At the same time, the installation and tightening of the locking nut requires sufficient operating space, making it difficult to implement in confined pipe shafts or densely equipped areas, and disassembly during later maintenance is difficult, easily leading to thread damage due to improper operation; welding fixing technology, in some scenarios, uses welding to fix the pipe joint and pipeline as a single structure to eliminate the possibility of loosening. However, the welding process generates a high-temperature heat-affected zone, damaging the metal structure of the pipe fitting and significantly reducing its mechanical strength and corrosion resistance, especially for high-strength alloy pipe fittings. Furthermore, welded pipe fittings cannot be repeatedly disassembled and adjusted; if localized damage occurs, the entire pipe section must be replaced, significantly increasing maintenance costs and downtime. Threadlocker anti-loosening technology involves applying anaerobic threadlocker to the pipe fitting threads, utilizing the adhesive strength after curing to prevent loosening. However, its effectiveness is significantly limited by environmental conditions. In high-temperature or high-humidity environments, the curing speed and adhesive strength of the threadlocker decrease drastically, leading to anti-loosening failure. Moreover, once the threadlocker is fully cured, removal requires specialized solvents and mechanical polishing, which is not only cumbersome but also easily damages the thread surface, rendering the pipe fitting unusable, which contradicts the development concepts of green environmental protection and resource conservation.

[0004] In conclusion, developing a universal pipe joint anti-loosening device that is simple in structure, easy to install, and highly versatile, which can avoid damage to the pipe joint body, allow for repeated disassembly, and maintain a stable anti-loosening effect under complex working conditions, has become an urgent need to solve the problem of loosening in pipeline systems and improve their safety and reliability. Utility Model Content

[0005] The purpose of this utility model is to provide a pipe joint anti-loosening device to address the aforementioned shortcomings. This device solves the problem of pipe joint loosening and is suitable for retrofitting existing pipe joints without requiring processing or modification of the pipe joint body, thus avoiding any impact on its strength. It features a simple structure, convenient installation, reusability, and strong applicability. To achieve the above objectives, this utility model provides the following technical solution: A pipe fitting anti-loosening device includes a support assembly, a connecting assembly, and a ratchet mechanism; the support assembly contains the connecting assembly and the ratchet mechanism; one end of the support is used to engage a fixing nut at one end of the pipe fitting, and the other end is used to engage a rotating nut at the other end of the pipe fitting; the two ends of the support assembly can move closer or further apart axially via the connecting assembly; the ratchet mechanism is used to limit the directional rotation of the support assembly relative to the pipe fitting.

[0006] Furthermore, the support assembly includes a support base and a limiting plate; the support base and the limiting plate are movably connected by a connecting assembly and are coaxially arranged, and the support base and the limiting plate can move closer to or further away from each other along the axial direction; the support base is used to engage a fixing nut at one end of the pipe joint, and the limiting plate is used to engage a rotating nut at the other end of the pipe joint.

[0007] Furthermore, the support base has an opening on the side away from the limiting plate, and a round hole matching the position of the pipe joint is provided on the opposite side; a positioning plate is provided inside the support base; the positioning plate is rotatably mounted on the inner side of the side with the round hole via a ratchet mechanism.

[0008] Furthermore, the positioning plate has a first hexagonal hole that matches the fixing nut of the pipe joint.

[0009] Furthermore, the limiting plate has a second hexagonal hole that matches the rotating nut of the pipe joint.

[0010] Furthermore, the connecting assembly includes a connecting rod; connecting blocks are provided at opposite positions on the support base and the limiting plate; the connecting blocks on the support base are provided with mounting holes; one end of the connecting rod is provided with a limiting block, and the other end passes through the mounting hole of the connecting block on the support base and is fixed to the connecting block on the limiting plate.

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

[0012] Furthermore, the ratchet mechanism includes a ratchet and a pawl assembly; the ratchet is provided circumferentially on the inner sidewall of the support base; the ratchet is located in front of the limiting block; the limiting block is provided with a plurality of pawl assemblies that cooperate with the ratchet.

[0013] Furthermore, the pawl assembly includes a pawl, a second spring, a fixed shaft, and a baffle; the positioning plate is provided with a fixed shaft; a rotatable pawl is sleeved on the fixed shaft; the pawl engages with a 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 base has a cover plate on its open side; the cover plate has a third hexagonal hole that matches the fixing nut of the pipe joint.

[0015] The beneficial effects of this utility model are: This utility model discloses a pipe joint anti-loosening device, including a support assembly, a connecting assembly, and a ratchet mechanism. The support assembly contains the connecting assembly and the ratchet mechanism. One end of the support is used to engage a fixing nut at one end of the pipe joint, and the other end is used to engage a rotating nut at the other end of the pipe joint. The two ends of the support assembly can move closer or further apart axially via the connecting assembly. The ratchet mechanism restricts the support assembly from rotating unidirectionally in the pipe joint tightening direction. This utility model's pipe joint anti-loosening device effectively prevents pipe joint loosening and can further tighten the pipe joint by rotating the ratchet mechanism again. It is suitable for retrofitting existing pipe joints without requiring processing or modification of the pipe joint body, thus avoiding any impact on its strength. Its structure is simple, easy to install, and reusable. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the anti-loosening device for pipe joints of this utility model; Figure 2 This is a three-dimensional structural diagram of the support base of this utility model, omitting the cover plate; Figure 3 This is a three-dimensional structural diagram of the limiting plate and connecting assembly of this utility model; Figure 4 This is a three-dimensional structural diagram of the anti-loosening device for pipe joints of this utility model installed on the pipe joint; Figure 5 This is a cross-sectional view of the anti-loosening device for pipe joints of this utility model installed on the pipe joint; In the attached diagram: 1-Support base, 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 connector, 20-Fixing nut, 21-Rotating nut. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0018] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

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

[0020] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. The meaning of such spatial relative terms includes different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0021] Example 1: See attached Figures 1-5A pipe fitting anti-loosening device includes a support assembly, a connecting assembly, and a ratchet mechanism. The support assembly, mainly used for installation on the pipe fitting 19, includes a support base 1 and a limiting plate 2. One end of the support base 1 engages with a fixing nut 20 at one end of the pipe fitting 19, and the other end of the limiting plate 2 engages with a rotating nut 21 at the other end of the pipe fitting 19. The support base 1 and the limiting plate 2 are coaxially arranged and movably connected by the connecting assembly. The support base 1 and the limiting plate 2 can only move linearly towards or away from each other along the axial direction via the connecting assembly. When the support assembly needs to be installed on the pipe fitting 19, the support base 1 is engaged with the fixing nut 20 of the pipe fitting 19, the limiting plate 2 is brought closer to the support base 1 via the connecting assembly, the rotating nut 21 is tightened onto the pipe fitting 19, and then the limiting plate 2 is moved away from the support base 1 via the connecting assembly until the limiting plate 2 is engaged with the rotating nut 21 of the pipe fitting 19. A ratchet mechanism is provided inside the support base 1. The ratchet mechanism restricts the support base 1 to rotate only in the tightening direction of the rotating nut 21, and cannot rotate in the opposite direction. It can be understood that the limiting plate 2, which is connected to the support base 1 through the connecting assembly, can only rotate in the tightening direction of the rotating nut 21, and cannot rotate in the opposite direction. Therefore, the rotating nut 21, which is stuck on the limiting plate 2, can only rotate in the tightening direction, thereby preventing the pipe joint 19 from loosening. After the support assembly is installed on the pipe joint 19, the support base 1 can be rotated again in the tightening direction of the rotating nut 21. The limiting plate 2 drives the rotating nut 21 to rotate in the tightening direction again, so that the pipe joint 19 generates a certain pre-tightening force, further preventing the pipe joint 19 from loosening. The anti-loosening device for pipe joints of this utility model effectively prevents the pipe joint 19 from loosening. It can also rotate the ratchet mechanism again to give the pipe joint 19 a certain pre-tightening force, further preventing the joint from loosening. It is suitable for retrofitting of the pipe joint 19 after it has been installed. There is no need to process or modify the pipe joint 19 body, thus avoiding the impact on its strength. Its structure is simple, easy to install, and can be repeatedly installed and used.

[0022] Specifically, the shapes of support base 1 and limiting plate 2 are as shown in the attached figure. Figures 1-3 As shown in the figure. The support base 1 is a cylinder with an internal cavity, as shown in the attached figure. Figure 2As shown, one side is open, and a circular hole 3 is provided on the corresponding side of the other side. The circular hole 3 corresponds to the position of the pipe connector 19 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, but larger than the size of the corresponding position on the pipe connector 19. A positioning plate 4 is provided on the inner side of the side with the circular hole 3. The positioning plate 4 is connected to the inner side of the support base 1 through a ratchet mechanism. The positioning plate 4 and the support base 1 can rotate relatively 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 connector 19. When the support base 1 is installed on the pipe connector 19, the positioning plate 4 is stuck on the fixing nut 20 and is relatively fixed and cannot rotate, which is equivalent to a fixing function. Figure 5 It can be seen that the support base 1 has a circular hole 3 on its side and the positioning plate 4 corresponding to the position on the pipe joint 19. The entire outer frame of the support base 1 can rotate in the tightening direction of the rotating nut 21 via a ratchet mechanism. Similarly, the limiting plate 2 has a second hexagonal hole 6 that matches the rotating nut 21 of the pipe joint 19. When the support base 1 is installed on the pipe joint 19, the limiting plate 2 is secured to 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, it drives the limiting plate 2 to rotate in the tightening direction of the rotating nut 21 as well, thereby driving the rotating nut 21 to rotate again in the tightening direction. 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 means of a retaining spring, or it can be connected to the positioning plate 4 by screws. Specific design and installation can be achieved using existing technology, therefore, it will not be described in detail here. A third hexagonal hole 17 matching the fixing nut 20 is also provided on the cover plate 16. When the support 1 is installed on the pipe joint 19, the cover plate 16 is stuck on the fixing nut 20 and is relatively fixed together with the positioning plate 4 without rotating.

[0023] Specifically, the connecting assembly includes a connecting rod 7 and a first spring 10, and connecting blocks 8 are provided at opposite positions on the support base 1 and the limiting plate 2, as shown in the attached figure. Figures 1-3As shown, two connecting blocks 8 can be set on the outer wall of the support base 1, with the two connecting blocks 8 positioned at both ends of the axis of symmetry of the support base 1. Corresponding connecting blocks 8 are also set at corresponding positions on the limiting plate 2. It can be understood that multiple connecting blocks 8 are arranged circumferentially on the support base 1. Mounting holes 18 are provided on the connecting blocks 8 of the support base 1. The size of the mounting holes 18 is larger than the size of the connecting rod 7. One end of the connecting rod 7 has a limiting block 9, and the other end passes through the mounting hole 18 of the connecting block 8 on the support base 1 and is fixed to the connecting block 8 of the limiting plate 2. It can be fixed to the connecting block 8 of the limiting plate 2 by welding or threaded connection to achieve a rigid connection, ensuring 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, allowing the support base 1 and the limiting plate 2 to move closer or further apart along the direction of the connecting rod 7. A first spring 10 is also sleeved on the outside of the connecting rod 7 between the support base 1 and the limiting plate 2. When it is necessary to install the anti-loosening device for the pipe joint, first, the support base 1 is clamped onto the fixing nut 20 of the pipe joint 19, and the limiting plate 2 is brought close to the support base 1 and pressed against the support base 1 as much as possible. At this time, the first spring 10 is compressed. Then, the rotating nut 21 is tightened onto the pipe joint 19. After tightening, the limiting plate 2 is released. Under the action of the first spring 10, the limiting plate 2 will move away from the support base 1 until the limiting plate 2 is clamped onto 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, so that the limiting plate 2 is brought close to the support base 1 and pressed against the support base 1 as much as possible, and disengaged from the rotating nut 21. The rotating nut 21 is rotated in the opposite direction and removed. After tightening, the limiting plate 2 is released, and the anti-loosening device for the pipe joint can be removed. The connection component enables quick installation and disassembly of the anti-loosening device for the pipe joint, which is easy to operate and can be reused without processing or modification of the pipe joint 19 body. It is suitable for retrofitting of the pipe joint 19 that has already been installed.

[0024] Specifically, the ratchet mechanism includes a ratchet 11 and a pawl 12 assembly. The ratchet 11 is circumferentially arranged on the inner sidewall of the support base 1, and the ratchet 11 is located in front of the limiting block 9. The limiting block 9 is provided with multiple pawl 12 assemblies that cooperate with the ratchet 11, as shown in the attached figure. Figure 2As shown, two pawl assemblies 12 can be installed on the limiting block 9. The ratchet 11 and pawl 12 assemblies restrict the limiting plate 2 to the side of the support base 1, allowing only unidirectional rotation relative to the support base 1. The pawl 12 assembly includes a pawl 12, a second spring 13, a fixed shaft 14, and a baffle 15. The fixed shaft 14 is provided on the positioning plate 4, and a pawl 12 that engages with the ratchet 11 is fitted onto the fixed shaft 14. The pawl 12 can rotate around the fixed shaft 14. A baffle 15 is provided on one side of the positioning plate 4, and a second spring 13 is provided between the pawl 12 and the baffle 15. The baffle 15 and the second spring 13 limit the rotation angle of the pawl 12, and after rotation, the second spring 13 causes it to re-engage with the ratchet 11. The cooperation of the ratchet 11 and pawl 12 restricts the support base 1 to rotate only in one direction. (See attached diagram) Figure 2 As described above, when the positioning plate 4 is on the fixing nut 20 of the pipe joint 19, the support base 1 can only rotate counterclockwise and not clockwise.

[0025] Example 2: The installation process of this utility model's anti-loosening device for pipe joints is shown in the appendix. Figure 4 and attached Figure 5 .

[0026] First, secure the positioning plate 4 of the support base 1 to the fixing nut 20 of the pipe connector 19. Then, compress the first spring 10 with external force to bring the limiting plate 2 close to the support base 1 and as close as possible to it. Next, tighten the rotating nut 21 onto the pipe connector 19. After tightening, release the limiting plate 2. Under the action of the first spring 10, the limiting plate 2 will move away from the support base 1 until it is secured to the rotating nut 21 of the pipe connector 19. If the ratchet 11 is positioned as shown in the attached diagram... Figure 2 As configured in the diagram, after the anti-loosening device for the pipe joint is installed, the support base 1 can be rotated counterclockwise. At this time, the positioning plate 4 remains stationary, and the rotation of the support base 1 drives 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. After the anti-loosening device for the pipe joint is installed, it can also be seen from the attached diagram 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 that of the fixed nut 20 and the rotating nut 21, the movement range of the positioning plate 4 and the limiting plate 2 is also limited in the axial direction.

[0027] When it is necessary to disassemble the pipe connector 19, compress the first spring 10 to bring the limiting plate 2 close to the support base 1 and abut against the support base 1 as much as possible, disengaging it from the rotating nut 21. Rotate the rotating nut 21 in the opposite direction and remove it. After tightening, release the limiting plate 2, and the pipe connector anti-loosening device can be removed. The connecting assembly enables quick installation and disassembly of the pipe connector anti-loosening device, which is easy to operate, reusable, and requires no processing or modification of the pipe connector 19 body. It is suitable for retrofitting of pipe connectors 19 that have already been installed.

[0028] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

[0029] The above embodiments are preferred implementations of this utility model. In addition, other implementations are also included. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A pipe joint anti-loosening device, characterized in that: It includes a support assembly, a connecting assembly, and a ratchet mechanism; the support assembly contains the connecting assembly and the ratchet mechanism; one end of the support is used to engage a fixing nut at one end of the pipe fitting, and the other end is used to engage a rotating nut at the other end of the pipe fitting; the two ends of the support assembly can move closer or further apart along the axial direction through the connecting assembly; the ratchet mechanism is used to limit the directional rotation of the support assembly relative to the pipe fitting.

2. The anti-loosening device for pipe joints according to claim 1, characterized in that: The support assembly includes a support base (1) and a limiting plate (2); the support base (1) and the limiting plate (2) are movably connected by a connecting assembly and are coaxially arranged, and the support base (1) and the limiting plate (2) can move closer to or further away from each other along the axial direction; the support base (1) is used to engage the fixing nut at one end of the pipe joint, and the limiting plate (2) is used to engage the rotating nut at the other end of the pipe joint.

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

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

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

6. The anti-loosening device for pipe joints according to claim 2, characterized in that: The connecting assembly includes a connecting rod (7); connecting blocks (8) are provided at opposite positions on the support base (1) and the limiting plate (2); the connecting block (8) on the support base (1) is provided with a mounting hole (18); 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 base (1) and is fixed on the connecting block (8) of the limiting plate (2).

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

8. The anti-loosening device for pipe joints according to claim 3, characterized in that: The ratchet mechanism includes a ratchet (11) and a pawl (12) assembly; the inner sidewall of the support base (1) is provided with a ratchet (11) along the circumferential direction; the ratchet (11) is located in front of the limiting block (9); the limiting plate (2) is provided with a plurality of pawl (12) assemblies that cooperate with the ratchet (11).

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

10. A pipe joint anti-loosening device according to claim 2, characterized in that: The support base (1) has a cover plate (16) on its open side; the cover plate (16) has a third hexagonal hole (17) that matches the fixing nut of the pipe joint.

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