Pipe butt joint

Abstract

The utility model discloses a pipe butt joint which comprises a main pipe and two butt joint assemblies, the two butt joint assemblies are arranged at the two ends of the main pipe correspondingly, and the pipe butt joint fixes a to-be-clamped pipeline through the butt joint assemblies. The butt joint assembly comprises a rotating cylinder, a fixed cylinder, a rotating ring, a plurality of first limiting rods, a plurality of moving plates, a plurality of clamping assemblies and a driving assembly. The rotating cylinder is rotationally connected to one end of the main pipe. The fixed cylinder is rotationally connected to one end of the rotating cylinder; the rotating ring is fixed on the inner circumference of the rotating cylinder; the multiple first limiting rods are arranged on the inner circumference of the fixing cylinder at intervals. The multiple moving plates correspond to the multiple first limiting rods and are slidably connected to the peripheries of the corresponding first limiting rods. The multiple clamping assemblies are arranged on the side, away from the rotating ring, of the moving plate in a one-to-one correspondence mode. The driving assembly penetrates through the end, away from the main pipe, of the fixing cylinder and is connected with the clamping assembly. The driving assembly provides second driving force for the clamping assembly. The clamping device is convenient to connect to-be-clamped pipelines with different pipe diameters, and the application range is wider.

Description

Technical Field

[0001] The present application relates to the technical field of pipe butt joint, and in particular to a pipe butt joint. Background Art

[0002] A pipeline is a device connected by pipes, pipe fittings and valves for conveying gas, liquid or fluid with solid particles. Usually, the fluid is pressurized by blowers, compressors, pumps and boilers, and then flows from the high pressure part of the pipeline to the low pressure part. It can also be conveyed by the fluid's own pressure or gravity. Pipelines are widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, water conservancy projects and various industrial devices.

[0003] Traditional pipe butt joints are mainly used to connect pipes to each other, but the diameters of the pipes that can be butted are fixed and their scope of application is small. Utility Model Content

[0004] The main purpose of the present application is to provide a pipe butt joint, aiming to solve the problem that the diameter of the pipe that can be butt-jointed by the traditional pipe butt joint is fixed and the application range is small.

[0005] To achieve the above-mentioned purpose, the present application provides a pipe joint, which includes a main pipe and two groups of joint components, the two groups of joint components are respectively arranged at the two ends of the main pipe, the pipe joint fixes the pipe to be clamped through the joint components, and the joint components include: a rotating cylinder, a fixed cylinder, a rotating ring, multiple first limit rods, multiple movable plates, multiple groups of clamping components and a driving component, the rotating cylinder is rotatably connected to one end of the main pipe and its axial direction is the same as that of the main pipe, and the rotating cylinder has the freedom to rotate around its own axial direction; the fixed cylinder is rotatably connected to the end of the rotating cylinder away from the main pipe and its axial direction is the same as that of the main pipe, and the fixed cylinder is fixed to the main pipe; the rotating ring is fixed to the inner circumference of the rotating cylinder and its axial direction is the same as that of the main pipe, and the rotating ring back A plane thread is provided on the side away from the main pipe; a plurality of first limiting rods are arranged at intervals on the inner periphery of the fixed tube along the circumferential direction; a plurality of movable plates correspond to the plurality of first limiting rods and are slidably connected to the outer periphery of the corresponding first limiting rods, the movable plate has the freedom to slide radially along the main pipe, the side of the movable plate facing the rotating ring cooperates with the plane thread, and the movable plate moves radially along the main pipe in response to the first driving force provided by the rotating ring and the first limiting rods; a plurality of groups of clamping assemblies are arranged one by one on the side of the movable plate away from the rotating ring, and the clamping assemblies clamp the pipe to be clamped in response to the second driving force; the driving assembly is passed through the end of the fixed tube away from the main pipe and is connected to the clamping assembly, and the driving assembly provides the second driving force for the clamping assembly.

[0006] Optionally, a slide groove extending radially along the main pipe is provided on the side of the movable plate away from the rotating ring; the clamping assembly includes two sliders, two clamping plates and a spring, and the two sliders are slidably matched with the slide groove; the two clamping plates are fixed to the two sliders in a one-to-one correspondence and are respectively located at the inner periphery and outer periphery of the corresponding pipe to be clamped, and the two clamping plates approach each other in response to the second driving force to clamp the corresponding pipe to be clamped; the spring is connected between the two sliders.

[0007] Optionally, the driving assembly includes a moving cylinder, a threaded cylinder, multiple driving parts, multiple second limiting rods and multiple third limiting rods, the moving cylinder is arranged on the inner circumference of the fixed cylinder and the axial direction is the same as the axial direction of the main pipe; the threaded cylinder is penetrated through the end of the fixed cylinder away from the main pipe and is rotatably connected to the moving cylinder, the threaded cylinder is threadedly connected to the fixed cylinder and has the freedom to rotate around its own axial direction; the multiple driving parts are arranged one by one on the side of the moving plate away from the rotating ring and provide a second driving force for the corresponding two clamping plates; the multiple second limiting rods correspond to the moving plate and are fixed to the side of the moving plate away from the rotating ring, the axial direction of the second limiting rods is the same as the axial direction of the main pipe and passes through the corresponding driving parts, and the driving parts have the freedom to slide along the axial direction of the corresponding second limiting rods; the multiple third limiting rods correspond to the moving plate and are fixed to the inner circumference of the moving cylinder, the axial direction of the third limiting rods is the same as the radial direction of the main pipe and passes through the corresponding driving parts, and the driving parts have the freedom to slide along the axial direction of the corresponding third limiting rods.

[0008] Optionally, the driving part is provided with a through slot, and the two clamping pieces pass through the through slot; wherein the through slot has two oppositely arranged pressing inclined surfaces in the radial direction of the main pipe, and the two clamping pieces are provided with a force-bearing inclined surface cooperating with the pressing inclined surface on the side facing away from each other.

[0009] Optionally, in a direction away from the movable plate, the two pressing inclined surfaces on the corresponding driving part gradually move away from each other.

[0010] Optionally, the docking assembly further includes a sealing ring, which is disposed on the inner circumference of the threaded barrel and seals the gap between the threaded barrel and the pipe to be clamped.

[0011] Optionally, there are three movable plates and they are evenly arranged along the circumferential direction on a side of the rotating ring away from the main pipe.

[0012] Optionally, the docking assembly includes a U-shaped rod, and two ends of the U-shaped rod are respectively connected to the fixed main pipe and the rotating cylinder.

[0013] Optionally, the clamping assembly further includes two friction pads, and the two friction pads are respectively arranged on the sides of the two clamping pieces that are close to each other.

[0014] Optionally, a label is provided on the outer circumference of the rotating drum.

[0015] A pipe joint proposed in an embodiment of the present application takes one end of a main pipe as an example. When in use, the pipe to be clamped is inserted into a fixed cylinder, and then the rotating cylinder is rotated to drive the rotating ring around the axial rotation of the main pipe, and the rotating ring drives the movable plate to move radially along the main pipe, thereby adjusting the positions of multiple movable plates and clamping components. The clamping components and the movable plates are arranged at intervals along the circumferential direction. When the position of the clamping components is adjusted in this way, the size of the circle surrounded by the multiple groups of clamping components will be changed, which is convenient for clamping pipes to be clamped with different diameters. Then, the multiple groups of clamping components can be driven by the driving component to fix the pipes to be clamped, and the application range is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a pipe joint provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1 A cross-sectional view of an embodiment of the present invention;

[0018] Figure 3 for Figure 2 A magnified view of the structure at center;

[0019] Figure 4 A schematic diagram of the structure of a rotating ring of a pipe joint provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of the structure of a clamping assembly of a pipe joint provided in an embodiment of the present application.

[0021] In the figure: 1. main pipe; 11. U-shaped rod; 2. pipe to be clamped; 3. rotating cylinder; 4. fixed cylinder; 5. rotating ring; 6. first limiting rod; 7. moving plate; 71. slide groove; 81. slider; 82. clamping piece; 821. friction pad; 83. spring; 91. moving cylinder; 92. threaded cylinder; 921. sealing ring; 93. driving part; 94. second limiting rod; 95. third limiting rod.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] refer to Figure 1 to Figure 5 It should be understood that Figure 5 The connections between the components should be like Figure 4 As compact as in, this is just an example. Figure 5Some components in the figure are disassembled and displayed for easy understanding. An embodiment of the present application provides a pipe joint, which may include a main pipe 1 and two groups of docking components, which are respectively arranged at both ends of the main pipe 1. The pipe joint fixes the pipe 2 to be clamped through the docking component. The docking component may include: a rotating cylinder 3, a fixed cylinder 4, a rotating ring 5, a plurality of first limit rods 6, a plurality of movable plates 7, a plurality of clamping components and a driving component. The rotating cylinder 3 is rotatably connected to one end of the main pipe 1 and its axial direction is the same as that of the main pipe 1. The rotating cylinder 3 has the freedom to rotate around its own axial direction; the fixed cylinder 4 is rotatably connected to the end of the rotating cylinder 3 away from the main pipe 1 and its axial direction is the same as that of the main pipe 1. The fixed cylinder 4 is fixed to the main pipe 1; the rotating ring 5 is fixed to the inner periphery of the rotating cylinder 3 and its axial direction is the same as that of the main pipe 1. In the same direction, the side of the rotating ring 5 away from the main pipe 1 has a plane thread; a plurality of first limiting rods 6 are arranged at intervals on the inner periphery of the fixed tube 4 along the circumferential direction; a plurality of movable plates 7 correspond to the plurality of first limiting rods 6 and are slidably connected to the outer periphery of the corresponding first limiting rods 6, the movable plate 7 has the freedom to slide radially along the main pipe 1, and the side of the movable plate 7 facing the rotating ring 5 is matched with the plane thread, and the movable plate 7 moves radially along the main pipe 1 in response to the first driving force provided by the rotating ring 5 and the first limiting rods 6; a plurality of groups of clamping assemblies are arranged one by one on the side of the movable plate 7 away from the rotating ring 5, and the clamping assemblies clamp the pipe 2 to be clamped in response to the second driving force; the driving assembly is penetrated through the end of the fixed tube 4 away from the main pipe 1 and is connected to the clamping assembly, and the driving assembly provides the second driving force for the clamping assembly.

[0028] A pipe joint is proposed in an embodiment of the present application. Taking one end of the main pipe 1 as an example, when in use, the pipe 2 to be clamped is inserted into the fixed cylinder 4, and then the rotating cylinder 3 is rotated to drive the rotating ring 5 to rotate around the axial direction of the main pipe 1. The rotating ring 5 drives the movable plate 7 to move along the radial direction of the main pipe 1, thereby adjusting the positions of multiple movable plates 7 and the clamping components. The clamping components and the movable plates 7 are arranged at intervals along the circumferential direction. When the position of the clamping components is adjusted in this way, the size of the circle surrounded by the multiple groups of clamping components will be changed, which is convenient for clamping the pipes 2 to be clamped with different diameters. Then, the multiple groups of clamping components can be driven by the driving component to fix the pipes 2 to be clamped, and the application range is wider.

[0029] Specifically, Figure 4 As shown, the movable plate 7 is provided with meshing teeth meshing with the plane thread on one side facing the rotating ring 5, and the movable plate 7 cooperates with the first limiting rod 6, that is, the movable plate 7 can move radially along the main pipe 1, but cannot rotate around the axial direction of the main pipe 1. When the rotating ring 5 rotates around its own axial direction, it will drive the movable plate 7 to move radially along the main pipe 1, thereby changing the size of the circle surrounded by the multiple clamping components to match the pipes 2 to be clamped with different diameters.

[0030] like Figure 1As shown, the docking assembly may include a U-shaped rod 11, and the two ends of the U-shaped rod 11 respectively fix the main pipe 1 and the rotating cylinder 3, so that when the rotating cylinder 3 is rotated, the fixed cylinder 4 will not rotate, that is, the first limit rod 6 and the movable plate 7 will not rotate, so as to ensure that the operation of rotating the rotating ring 5 to drive the movable plate 7 to move is carried out normally.

[0031] Furthermore, a label is provided on the outer circumference of the rotating cylinder 3. The label may indicate in the form of arrows and text whether rotating the cylinder 3 in a certain direction will tighten or loosen the pipe 2 to be clamped, so that the use of the pipe joint is more convenient.

[0032] It should be noted that the docking assembly may also include a sealing ring 921, which is arranged on the inner circumference of the threaded tube 92. The sealing ring 921 seals the gap between the threaded tube 92 and the pipe 2 to be clamped. The sealing ring 921 can be selected according to the specific pipe diameter size and can seal the gap between the pipe 2 to be clamped and the fixed tube 4.

[0033] refer to Figure 4 In the exemplary embodiment, there are three moving plates 7 and they are evenly arranged along the circumferential direction on the side of the rotating ring 5 facing away from the main pipe 1 .

[0034] Specifically, the more movable plates 7 there are, the more corresponding clamping assemblies there are, and the better the effect of fixing the pipe 2 to be clamped, but at the same time the overall weight of the pipe joint is also greater, making it inconvenient to carry and transfer; the present application provides a preferred embodiment, in which there are three movable plates 7 and corresponding clamping assemblies also have three groups, and are evenly arranged along the circumferential direction, so that the three groups of clamping assemblies are more stable when fixing the pipe 2 to be clamped, and at the same time the overall weight of the pipe joint is small, making it convenient to carry.

[0035] refer to Figure 2 to Figure 5 In an exemplary embodiment, a slide groove 71 extending radially along the main pipe 1 is provided on the side of the movable plate 7 facing away from the rotating ring 5; the clamping assembly may include two sliders 81, two clamping pieces 82 and a spring 83, and the two sliders 81 are both slidably matched with the slide groove 71; the two clamping pieces 82 are fixed to the two sliders 81 in a one-to-one correspondence and are respectively located at the inner periphery and the outer periphery of the corresponding pipe 2 to be clamped, and the two clamping pieces 82 approach each other in response to the second driving force to clamp the corresponding pipe 2 to be clamped; the spring 83 is connected between the two sliders 81.

[0036] Specifically, the two clamping pieces 82 move closer to each other in response to the second driving force, and clamp the pipe 2 to be clamped on the inner and outer sides of the pipe 2 to be clamped. In this way, the inner and outer sides of the pipe 2 to be clamped are evenly stressed, deformation will not occur, and the service life is longer.

[0037] Further, such as Figure 4As shown, the clamping assembly can also include two friction pads 821, and the two friction pads 821 are respectively arranged on the side where the two clamping pieces 82 are close to each other; in this way, the two corresponding clamping pieces 82 clamp the pipe 2 to be clamped through the friction pads 821, which not only increases the friction force to make the clamping more stable, but also plays a certain protective role on the pipe 2 to be clamped.

[0038] Among them, when the two clamping pieces 82 are not close to each other, the spring 83 pushes the two sliders 81 away from each other, thereby driving the two clamping pieces 82 away from each other, that is, the distance between the two clamping pieces 82 increases. At this time, it is more convenient to insert the pipe 2 to be clamped into the fixing tube 4 so that the side wall of the pipe 2 to be clamped is between the corresponding two second clamping pieces 82.

[0039] refer to Figure 2 to Figure 5 In an exemplary embodiment, the driving assembly may include a moving cylinder 91, a threaded cylinder 92, a plurality of driving parts 93, a plurality of second limiting rods 94 and a plurality of third limiting rods 95. The moving cylinder 91 is arranged on the inner periphery of the fixed cylinder 4 and its axial direction is the same as that of the main pipe 1. The threaded cylinder 92 is inserted into one end of the fixed cylinder 4 away from the main pipe 1 and is rotatably connected to the moving cylinder 91. The threaded cylinder 92 is threadedly connected to the fixed cylinder 4 and has the freedom to rotate around its own axial direction. The plurality of driving parts 93 are arranged one by one on the side of the moving plate 7 away from the rotating ring 5 and are corresponding to the two clamping pieces 8. 2 provides a second driving force; a plurality of second limiting rods 94 correspond to the moving plate 7 and are fixed to the side of the moving plate 7 away from the rotating ring 5, the axial direction of the second limiting rods 94 is the same as the axial direction of the main pipe 1 and passes through the corresponding driving part 93, and the driving part 93 has the freedom to slide along the axial direction of the corresponding second limiting rods 94; a plurality of third limiting rods 95 correspond to the moving plate 7 and are fixed to the inner periphery of the moving cylinder 91, the axial direction of the third limiting rods 95 is the same as the radial direction of the main pipe 1 and passes through the corresponding driving part 93, and the driving part 93 has the freedom to slide along the axial direction of the corresponding third limiting rods 95.

[0040] Among them, reference Figure 5 The driving part 93 has a through slot, and the two clamping pieces 82 pass through the through slot; the through slot has two oppositely arranged pressing inclined surfaces in the radial direction of the main pipe 1, and the two clamping pieces 82 have a force-bearing inclined surface matching the pressing inclined surface on the side facing away from each other; in the direction away from the movable plate 7, the two pressing inclined surfaces on the corresponding driving part 93 gradually move away from each other.

[0041] Specifically, the threaded barrel 92 can be screwed to move the threaded barrel 92 relative to the fixed barrel 4 along the axial direction of the main pipe 1, that is, the threaded barrel 92 can be screwed outward from the fixed barrel 4 or screwed inward; when it is necessary to drive the clamping piece 82 to clamp the pipe 2 to be clamped, the threaded barrel 92 is screwed outward, and the moving barrel 91 is connected to the driving part 93 through the third limiting rod 95, and the driving part 93 is connected to the moving plate 7 through the second limiting rod 94, that is, the moving barrel 91 cannot rotate around the axial direction of the main pipe 1, then when the threaded barrel 92 is screwed outward, the threaded barrel 92 and the moving barrel 91 rotate relative to each other, and drive the moving barrel 91 The movable cylinder 91 drives the driving part 93 to move away from the movable plate 7 along the axial direction of the main pipe 1 through the third limiting rod 95. At this time, the pressing inclined surface gradually squeezes the corresponding force-bearing inclined surface, so that the two clamping pieces 82 are close to each other to clamp the pipe 2 to be clamped; when the pipe 2 to be clamped needs to be disassembled, the threaded cylinder 92 is screwed inward to drive the driving part 93 to move close to the movable plate 7 along the axial direction of the main pipe 1. At this time, the pressing inclined surface no longer squeezes the corresponding force-bearing inclined surface, and the spring 83 pushes the two clamping pieces 82 away from each other, no longer clamping the pipe 2 to be clamped, and the pipe 2 to be clamped can be disassembled.

[0042] It should be understood that the axial direction of the third limiting rod 95 is the same as the radial direction of the main pipe 1 and passes through the corresponding driving part 93, and the driving part 93 has the freedom to slide along the axial direction of the corresponding third limiting rod 95; the axial direction of the second limiting rod 94 is the same as the axial direction of the main pipe 1 and passes through the corresponding driving part 93, and the driving part 93 has the freedom to slide along the axial direction of the corresponding second limiting rod 94; in this way, when the movable cylinder 91 moves, the driving part 93 can be driven to move by the third limiting rod 95, and at the same time, it does not affect the radial movement of the driving part 93 following the movable plate 7 along the main pipe 1 through the second limiting rod 94.

[0043] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A pipe joint, comprising a main pipe (1) and two sets of joint components, wherein the two sets of joint components are respectively arranged at both ends of the main pipe (1), and the pipe joint fixes the pipe (2) to be clamped through the joint components, characterized in that: The docking assembly comprises: A rotating cylinder (3) is rotatably connected to one end of the main pipe (1) and has an axial direction that is the same as that of the main pipe (1). The rotating cylinder (3) has a degree of freedom to rotate around its own axial direction. A fixed cylinder (4) is rotatably connected to an end of the rotating cylinder (3) away from the main pipe (1) and has an axial direction that is the same as that of the main pipe (1); the fixed cylinder (4) is fixed to the main pipe (1); A rotating ring (5) is fixed to the inner circumference of the rotating cylinder (3) and has an axial direction that is the same as that of the main pipe (1); a side of the rotating ring (5) that is away from the main pipe (1) has a plane thread; A plurality of first limiting rods (6) are arranged at intervals along the circumferential direction on the inner circumference of the fixed cylinder (4); A plurality of movable plates (7) corresponding to the plurality of first limiting rods (6) and slidably connected to the outer periphery of the corresponding first limiting rods (6), the movable plates (7) having the freedom to slide radially along the main pipe (1), the side of the movable plate (7) facing the rotating ring (5) being engaged with the planar thread, the movable plate (7) moving radially along the main pipe (1) in response to a first driving force provided by the rotating ring (5) and the first limiting rod (6); A plurality of groups of clamping assemblies are arranged one by one on a side of the movable plate (7) away from the rotating ring (5), and the clamping assemblies clamp the pipe (2) to be clamped in response to a second driving force; A driving assembly is provided through an end of the fixing tube (4) away from the main tube (1) and connected to the clamping assembly, wherein the driving assembly provides the second driving force for the clamping assembly.

2. A pipe joint as claimed in claim 1, characterized in that: A slide groove (71) extending radially along the main pipe (1) is provided on the side of the movable plate (7) facing away from the rotating ring (5); the clamping assembly comprises: Two sliding blocks (81) are both slidably matched with the sliding groove (71); Two clamping pieces (82) are fixed to the two sliders (81) in a one-to-one correspondence and are respectively located at the inner periphery and the outer periphery of the corresponding pipe (2) to be clamped. The two clamping pieces (82) move closer to each other in response to the second driving force to clamp the corresponding pipe (2) to be clamped; A spring (83) is connected between the two sliders (81).

3. A pipe joint as claimed in claim 2, characterized in that: The drive assembly comprises: A movable cylinder (91) is arranged on the inner periphery of the fixed cylinder (4) and has an axial direction which is the same as that of the main cylinder (1); A threaded cylinder (92) is inserted through an end of the fixed cylinder (4) away from the main cylinder (1) and is rotatably connected to the movable cylinder (91). The threaded cylinder (92) is threadably connected to the fixed cylinder (4) and has the freedom to rotate around its own axis. A plurality of driving parts (93) are arranged one by one on a side of the moving plate (7) away from the rotating ring (5) and provide the second driving force for the corresponding two clamping pieces (82); a plurality of second limiting rods (94), corresponding to the movable plate (7) and fixed to a side of the movable plate (7) away from the rotating ring (5); the axial direction of the second limiting rods (94) is the same as the axial direction of the main pipe (1) and passes through the corresponding driving part (93); the driving part (93) has the freedom to slide along the axial direction of the corresponding second limiting rods (94); A plurality of third limiting rods (95) correspond to the movable plate (7) and are fixed to the inner circumference of the movable cylinder (91); the axial direction of the third limiting rods (95) is the same as the radial direction of the main pipe (1) and passes through the corresponding driving part (93); and the driving part (93) has the freedom to slide along the axial direction corresponding to the third limiting rods (95).

4. A pipe joint as claimed in claim 3, characterized in that: The driving portion (93) has a through slot, and the two clamping pieces (82) pass through the through slot; The through groove has two oppositely arranged pressing inclined surfaces in the radial direction of the main pipe (1), and a force-bearing inclined surface cooperating with the pressing inclined surfaces is arranged on the side of the two clamping pieces (82) facing away from each other.

5. A pipe joint as claimed in claim 4, characterized in that: In the direction away from the movable plate (7), the two pressing inclined surfaces corresponding to the driving part (93) gradually move away from each other.

6. A pipe joint as claimed in claim 3, characterized in that: The docking assembly also includes: A sealing ring (921) is arranged on the inner circumference of the threaded barrel (92), and the sealing ring (921) seals the gap between the threaded barrel (92) and the pipe (2) to be clamped.

7. A pipe joint as claimed in claim 1, characterized in that: There are three movable plates (7) which are evenly arranged along the circumferential direction on the side of the rotating ring (5) away from the main pipe (1).

8. A pipe joint as claimed in claim 1, characterized in that: The docking assembly comprises: The U-shaped rod (11) has two ends respectively fixed to the main pipe (1) and the rotating cylinder (3).

9. A pipe joint as claimed in claim 2, characterized in that: The clamping assembly also includes: The two friction pads (821) are respectively arranged on the sides of the two clamping pieces (82) that are close to each other.

10. A pipe joint as claimed in claim 2, characterized in that: A label is arranged on the outer circumference of the rotating cylinder (3).

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