A connecting joint and a tube taking device

Abstract

The present invention relates to the field of pipe connection and disassembly, and discloses a connection joint and a pipe removal device, comprising: an inner pipe, an outer pipe, a first elastic claw ring and an elastic tightening ring, an annular insertion groove for inserting the pipe is defined between the inner pipe and the outer pipe, and a first inverted tooth piece is provided on the first elastic claw ring, and an inverted tooth portion is provided on the elastic tightening ring, and the two are respectively defined with the inner pipe to form a first clamping point and a second clamping point. The beneficial effects of the present invention are: the first inverted tooth piece and the inverted tooth portion extend inwardly and gradually tilt backward from the outside to the inside, ensuring smooth insertion when the pipe is inserted, and when the pipe is subjected to a force to disengage outward, the first inverted tooth piece and the inverted tooth portion can clamp the pipe to prevent it from disengaging from the annular insertion groove, and at the same time, the pipe can be easily removed by the pipe removal device, and the installation and disassembly are convenient, and the fixing effect is good.

Description

Technical Field

[0001] The present invention relates to the field of pipe connection and disassembly, and particularly to a connection joint and a pipe taking device. Background Art

[0002] At present, a large number of pipes are used in the fields of water supply and drainage, gas, etc. These pipes need to be connected by joints. The existing pipe joints usually adopt methods such as crimping type, flared slip joint type and nut ferrule type. However, the above connection methods all have certain drawbacks: 1. Crimping type joints and flared slip joint type joints require professional plumbers to install with special tools, which is highly professional and the operation is cumbersome and complex. If not careful, it will cause leakage at the joint. And since these joints cannot be disassembled and reused after installation, if the interface leaks, the pipe can only be cut short, which makes the pipe length shorter and new pipes and joints need to be re-laid, wasting time, labor and money; 2. Nut ferrule type joints need to be tightened with a wrench to install, so there are requirements for the installation space and a wrench position needs to be reserved, which has certain installation limitations. And after using for a period of time, the nut is easy to loosen, resulting in leakage at the connection. Therefore, there is an urgent need for a connection joint to solve the problems existing in the above existing joints. Summary of the Invention

[0003] The first object of the present application is to provide a connection joint, which prevents the pipe from falling off through the anti-detachment structure between the inner pipe and the outer pipe, and is easy to install, reduces the installation cost and has good applicability.

[0004] The object of the present application is achieved by the following technical solutions:

[0005] A connection joint, comprising: an inner pipe, an outer pipe, a first elastic claw ring and an elastic tightening ring. The outer pipe is sleeved outside the inner pipe. The rear end of the outer pipe is connected to the inner pipe, and an annular insertion groove is defined between the outer pipe and the inner pipe, and the annular insertion groove is open towards the front end;

[0006] A snap ring is provided on the inner wall of the outer pipe. The first elastic claw ring and the elastic tightening ring are both arranged in the annular insertion groove. The elastic tightening ring is installed on the inner wall of the outer pipe and is located in front of the snap ring. A clamping groove is defined between the rear side of the elastic tightening ring and the front side of the snap ring;

[0007] The first elastic claw ring includes a first mounting ring and first inverted tooth pieces connected to the inner side of the first mounting ring. The first mounting ring is fitted and clamped in the clamping groove. The first inverted tooth pieces extend inwards and gradually incline backwards from outside to inside. The first inverted tooth pieces and the inner pipe define a first clamping point;

[0008] The inner wall of the outer tube is provided with a first conical surface, which is spaced in front of the snap ring. The first conical surface has an inner diameter that gradually increases from front to back. The elastic tightening ring has a second conical surface that cooperates and abuts against the first conical surface. The inner wall of the elastic tightening ring is provided with an inwardly extending reverse tooth portion that gradually slopes backward from outside to inside. The reverse tooth portion and the inner tube define a second clamping point.

[0009] In some embodiments of the present application, the elastic tightening ring includes a tightening portion and a positioning portion. The tightening portion abuts against the front side of the positioning portion. The second conical surface is provided on the outer wall of the tightening portion. The positioning portion and the snap ring define the card slot. The reverse tooth portion is provided on the inner wall of the tightening portion.

[0010] In some embodiments of the present application, the tightening portion includes a tightening ring and a sleeve provided inside the tightening ring. The inner wall of the tightening ring is connected to the outer wall of the sleeve. The tightening ring abuts against the front side of the positioning portion. The reverse tooth portion is provided on the inner wall of the sleeve.

[0011] In some embodiments of the present application, the rear end face of the sleeve is arranged close to the front side of the first reverse tooth piece. The tightening ring is provided with a first step, and the sleeve is provided with a second step that axially cooperates and engages with the first step to limit the movement of the sleeve in the direction of the pipe orifice.

[0012] In some embodiments of the present application, the outer tube includes an outer tube seat and an outer tube body. The outer tube seat is sleeved on the outside of the inner tube. The outer tube body is connected to the outside of the outer tube seat. The snap ring is provided on the front side of the outer tube seat and is located inside the outer tube body. The first conical surface is provided on the inner wall of the outer tube body.

[0013] In some embodiments of the present application, a sealing ring is further included. A first groove is provided on the outer wall of the inner tube. The sealing ring is arranged in the first groove.

[0014] In some embodiments of the present application, a second elastic claw ring is further included. The second elastic claw ring includes a second mounting ring and second reverse tooth pieces. A second groove is provided on the outer peripheral wall surface of the inner tube. The second mounting ring is arranged in the second groove. The second reverse tooth pieces are connected to the front side of the second mounting ring and slope backward from outside to inside. The outer diameter of the second reverse tooth pieces is larger than the diameter at the connection position of the outer tube and the inner tube.

[0015] In some embodiments of the present application, an observation port is provided on the outer tube that penetrates through the inside and outside of the outer tube for observing the position of the pipe material in the annular insertion groove.

[0016] In some embodiments of the present application, it further includes an indicating ring slidably disposed on the inner wall of the outer tube. The indicating ring is disposed in the annular insertion groove and axially located between the first clamping point and the inner opening of the observation port.

[0017] The second object of the present application is to provide a tube taking device, including: an ejecting part and a socket part. The ejecting part is connected to the end face of the socket part. The ejecting part is used to be inserted into the annular insertion groove as described above to take out the pipe.

[0018] For the connecting joint and the tube taking device of the present application, an annular insertion groove for inserting the pipe is defined by the cooperation of the inner tube and the outer tube, so as to connect the pipe. Through the first reverse tooth piece extending inwards on the first elastic claw ring and gradually tilting backwards from outside to inside, and the reverse tooth part extending inwards on the elastic tightening ring and gradually tilting backwards from outside to inside, the pipe is clamped at the current position to prevent it from coming out, and it will not affect the insertion of the pipe. At the same time, the pipe can be easily taken out through the tube taking device, the installation and disassembly are convenient, and the fixing effect is good. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of the connecting joint of this solution;

[0020] Figure 2 is the cross-sectional view of the connecting joint of this solution;

[0021] Figure 3 is Figure 2 the enlarged view of part A in;

[0022] Figure 4 is the exploded view of the connecting joint of this solution;

[0023] Figure 5 is the structural schematic diagram of the outer tube seat of this solution;

[0024] Figure 6 is the structural schematic diagram of the outer tube body of this solution;

[0025] Figure 7 is the structural schematic diagram of the first elastic claw ring of this solution;

[0026] Figure 8 is the structural schematic diagram of the tightening ring of this solution;

[0027] Figure 9 is the structural schematic diagram of the sleeve of this solution;

[0028] Figure 10 is the structural schematic diagram of the second elastic claw ring of this solution;

[0029] Figure 11 is the structural schematic diagram of the indicating ring of this solution;

[0030] Figure 12 is a schematic structural view of the tube-taking device of this solution;

[0031] Figure 13 is a cross-sectional view of the connecting joint of this solution at the first intubation depth;

[0032] Figure 14 is a cross-sectional view of the connecting joint of this solution at the second tea house depth;

[0033] Figure 15 is Figure 14 an enlarged view of part B in

[0034] Figure 16 is a cross-sectional view of the tube-taking device of this solution during operation;

[0035] Figure 17 is Figure 16 an enlarged view of part C in

[0036] In the figure, 1, inner tube; 11, first groove; 12, second groove; 2, outer tube; 21, snap ring; 22, card slot; 23, first conical surface; 24, outer tube seat; 25, outer tube body; 26, observation port; 3, first elastic claw ring; 31, first mounting ring; 32, first reverse tooth piece; 33, first clamping point; 4, elastic tightening ring; 41, second conical surface; 42, reverse tooth part; 43, second clamping point; 44, tightening part; 441, tightening ring; 442, sleeve; 443, first step; 444, second step; 45, positioning part; 5, annular insertion groove; 6, sealing ring; 7, second elastic claw ring; 71, second mounting ring; 72, second reverse tooth piece; 8, indicating ring; 9, tube-taking device; 91, ejecting part; 92, sleeving part. Specific Embodiments

[0037] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top", "bottom", "circumferential", "center", etc. used in the present application to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. It should be noted that in the present solution, "front" and "rear" refer to that when installed, the side close to the user is "front" and the side far from the user is "rear".

[0039] As Figure 1-4 , Figure 7 and Figures 13-15 shown, a connection joint includes: an inner tube 1, an outer tube 2, a first elastic claw ring 3, and an elastic tightening ring 4. The outer tube 2 is sleeved on the outside of the inner tube 1. The rear end of the outer tube 2 is connected to the inner tube 1, and an annular insertion groove 5 is defined between the outer tube 2 and the inner tube 1. The annular insertion groove 5 is open towards the front end;

[0040] A snap ring 21 is provided on the inner wall of the outer tube 2. The first elastic claw ring 3 and the elastic tightening ring 4 are both disposed in the annular insertion groove 5. The elastic tightening ring 4 is installed on the inner wall of the outer tube 2 and is located on the front side of the snap ring 21. A card slot 22 is defined between the rear side of the elastic tightening ring 4 and the front side of the snap ring 21;

[0041] The first elastic claw ring 3 includes a first mounting ring 31 and first inverted tooth pieces 32 connected to the inner side of the first mounting ring 31. The first mounting ring 31 is fitted and engaged in the card slot 22. The first inverted tooth pieces 32 extend inwards and gradually incline backwards from outside to inside. The first inverted tooth pieces 32 and the inner tube 1 define a first clamping point 33;

[0042] A first tapered surface 23 is provided on the inner wall of the outer tube. The first tapered surface 23 is spaced on the front side of the snap ring 21. The inner diameter of the first tapered surface 23 gradually increases from front to rear. The elastic tightening ring 4 has a second tapered surface 41 that cooperates with and abuts against the first tapered surface 23. A reverse tooth portion 42 is provided on the inner wall of the elastic tightening ring 4. The reverse tooth portion 42 extends inwards and gradually inclines backwards from outside to inside. The reverse tooth portion 42 and the inner tube 1 define a second clamping point 43.

[0043] Based on the above technical scheme, the outer tube 2 is preferably connected to the middle position of the inner tube 1, so that two front and rear annular insertion grooves 5 are defined between the inner tube 1 and the outer tube 2, and the two pipes can be connected by inserting them into the two annular insertion grooves 5. The first elastic claw ring 3 is connected at an angle, preferably in a "V" shape. The shape of the clamping ring 21 is adapted to the shape of the first elastic claw ring 3, so that the first mounting ring 31 can be clamped on the clamping groove 22 defined between the clamping ring 21 and the elastic tightening ring 4. The first inverted tooth piece 32 extends inward and gradually tilts backward from the outside to the inside, which will not affect the normal insertion of the pipe, and the first inverted tooth piece 32 partially extends into the installation position and cooperates with the inner tube 1 to form a first clamping point 33. After the pipe is installed in place, the first inverted tooth piece 32 will produce a certain clamping force on the pipe. When the pipe is subjected to a pulling force toward the pipe mouth, the first inverted tooth piece 32 can prevent the pipe from falling out. Preferably, the first inverted tooth piece 32 is composed of a plurality of inverted tooth pieces evenly spaced and circumferentially distributed, which is light in weight and not easy to be damaged; the first elastic claw ring 3 is preferably made of a high-strength and elastic metal sheet material support, which has high strength and strong deformation ability. The elastic tightening ring 4 abuts against the first mounting ring 31. When the first elastic claw ring 3 is subjected to a pulling force toward the pipe mouth, the first inverted tooth piece 32 drives the first mounting ring 31 to move axially toward the pipe mouth, thereby giving the elastic tightening ring 4 an axial force. Since the outer wall of the elastic tightening ring 4 has an inclined second conical surface 41 and cooperates with the first conical surface 23 of the inner wall of the outer tube 2, the elastic tightening ring 4 will be squeezed inward after being subjected to the axial force. Since the inner wall of the sleeve 442 is provided with an inverted tooth portion 42 extending obliquely backward and inward, a second clamping point 43 is defined between the inverted tooth portion 42 and the inner tube 1. When the inverted tooth portion 42 abuts against the pipe, it will apply another force to the pipe to prevent the pipe from falling out, thereby achieving a multiple anti-falling-out effect. When installing the pipe, it is only necessary to insert the pipe into the annular insertion groove 5, which is very convenient to install.

[0044] In some embodiments of the present application, Figure 2 , 3As shown, the elastic tightening ring 4 includes a tightening portion 44 and a positioning portion 45. The tightening portion 44 abuts against the front side of the positioning portion 45. The second tapered surface 41 is provided on the outer wall of the tightening portion 44. The positioning portion 45 and the snap ring 21 define the clamping groove 22 therebetween. The reverse tooth portion 42 is provided on the inner wall of the tightening portion 44. Since the elastic tightening ring 4 shrinks and clamps the pipe after being subjected to an axial force, it is necessary to consider both axial force and radial shrinkage. It is relatively difficult for a whole elastic tightening ring 4 to shrink radially. Therefore, the elastic tightening ring 4 can be divided into two parts. The positioning portion 45 is used to define the clamping groove 22 with the snap ring 21 for the installation of the first elastic claw ring 3 and bear the axial force. The positioning portion 45 can be made of a non-elastic material, which has a better force transmission effect and no deformation. And the positioning portion 45 is preferably a complete circle, which can cooperate with the first mounting ring 31 correspondingly to receive the axial force given by the first mounting ring 31. The outer periphery of the positioning portion 45 is provided with a convex ring extending axially backward, and this convex ring and the snap ring 21 define the clamping groove 22, so that the axial tensile force that the first elastic claw ring 3 can bear is increased, and the first elastic claw ring 3 is prevented from failing due to yielding deformation under force. The tightening portion 44 bears the axial force transmitted from the positioning portion 45, and the second tapered surface 41 thereon abuts against the first tapered surface 23 on the inner side of the outer pipe 2, converting the axial force into a radial component force, thereby restricting and shrinking the tightening portion 44, so that the reverse tooth portion 42 clamps the pipe to prevent it from coming off. The tightening portion 44 is preferably provided with a notch portion, so that the tightening portion 44 can be tightened inward more greatly after being subjected to a radial force, which is more conducive to the reverse tooth portion 42 being clamped on the pipe.

[0045] Specifically, as shown in Figure 2 , 3 , 8, and 9, the tightening portion 44 includes a tightening ring 441 and a sleeve 442 provided inside the tightening ring 441. The inner wall of the tightening ring 441 is connected to the outer wall of the sleeve 442. The tightening ring 441 abuts against the front side of the positioning portion 45. The reverse tooth portion 42 is provided on the inner wall of the sleeve 442. The tightening portion 44 is divided into two parts, and together with the positioning portion 45, there are a total of three parts. After splitting, it is more conducive to deformation and force. The tightening ring 441 shrinks radially and abuts against the outer wall of the sleeve 442, causing the sleeve 442 to shrink radially at the same time, and the reverse tooth portion 42 clamps the pipe. The tightening ring 441 is preferably provided with a through notch portion. The front end of the sleeve 442 is preferably provided with a notch portion, and the rear end is circumferentially communicated. The through notch portion on the tightening ring 441 ensures greater deformation of the tightening ring 441 and good clamping effect. The notch portion of the sleeve 442 is partially communicated, enabling the sleeve 442 to balance deformation and strength.

[0046] More specifically, continue to refer to Figure 2 , 3As shown in FIGS. 8 and 9, the rear end face of the sleeve 442 is disposed close to the front side of the first reverse tooth piece 32. A first step 443 is provided on the tightening ring 441, and a second step 444 axially mating and clamping with the first step 443 is provided on the sleeve 442 to limit the movement of the sleeve 442 in the direction of the pipe orifice. When the pulling-out force applied to the pipe material is relatively large, the first elastic claw ring 3 deforms greatly, and the first reverse tooth piece 32 will abut against the rear end face of the sleeve 442, which not only increases the stiffness of the first reverse tooth piece 32, but also applies an axial force to the sleeve 442, causing the sleeve 442 to move in the direction of the pipe orifice. The axial force is transmitted to the tightening ring 441 through the step fit, so that the reverse tooth portion 42 on the tightening ring 441 clamps the pipe material more tightly, further enhancing the anti-pulling-out effect.

[0047] In some embodiments of the present application, as Figures 2-6 shown, the outer pipe 2 includes an outer pipe seat 24 and an outer pipe body 25. The outer pipe seat 24 is sleeved on the outside of the inner pipe 1, and the outer pipe body 25 is connected to the outside of the outer pipe seat 24. The snap ring 21 is provided on the front side of the outer pipe seat 24 and is located inside the outer pipe body 25. The first tapered surface 23 is provided on the inner wall of the outer pipe body 25. The outer pipe seat 24 and the outer pipe body 25 can be connected by interference fit, threaded connection, mating clamping, etc. Preferably, the outer pipe seat 24 and the outer pipe body 25 are connected by threaded connection, which has good connection effect and is easy to process. An external thread is provided on the outer peripheral wall surface of the outer pipe seat 24, and an internal thread is provided on the inner peripheral wall surface of the outer pipe body 25, and the internal and external threads are tightened and fixed. Moreover, a clamping structure for preventing loosening is provided on the outer pipe body 25 and the outer pipe seat 24. Preferably, a slanted small protrusion is provided on the inner side of the end of the outer pipe body 25, and a mating small protrusion is also provided at the corresponding position of the outer pipe seat 24 and the outer pipe body 25. The outer pipe body 25 is tightened on the outer pipe seat 24, so that the two parts of the small protrusions are in interference fit, and the slanted small protrusion can prevent the threaded fit of the outer pipe body 25 and the outer pipe seat 24 from loosening and coming off.

[0048] In some embodiments of the present application, as Figure 2 shown, it further includes a sealing ring 6. A first groove 11 is provided on the outer wall of the inner pipe 1, and the sealing ring 6 is disposed in the first groove 11. The sealing ring 6 is disposed on the outer peripheral wall surface and is preferably made of rubber material, which can not only play a sealing role to prevent fluid from entering between the inner pipe 1 and the outer pipe 2 through the gap between the pipe material and the inner pipe 1, but also increase the friction between the pipe material and the inner pipe 1, further improving the installation and fixing effect. The sealing ring 6 is preferably arranged such that part of it is disposed in the installation position when the pipe material is not installed, and when the pipe material is inserted, the pipe material squeezes the sealing ring 6 to deform and press it into the first groove 11, and the sealing and fixing effects are better.

[0049] In some embodiments of the present application, as Figure 2 、10 As shown, it further includes a second elastic claw ring 7. The second elastic claw ring 7 includes a second mounting ring 71 and second reverse tooth pieces 72. A second groove 12 is provided on the outer peripheral wall surface of the inner tube 1. The second mounting ring 71 is arranged in the second groove 12. The second reverse tooth pieces 72 are connected to the front side of the second mounting ring 71 and incline backward from outside to inside. The outer diameter of the second reverse tooth pieces 72 is greater than the diameter at the connection position of the outer tube 2 and the inner tube 1. The second elastic claw ring 7 is connected at an angle, preferably in a "V" shape. The second mounting ring 71 is fitted and installed in the second groove 12. A plurality of second reverse tooth pieces 72 are evenly distributed along the radial direction of the second mounting ring 71. The outer diameter of the second reverse tooth pieces 72 being greater than the diameter at the connection position of the outer tube 2 and the inner tube 1 can axially limit the outer tube 2 to prevent the outer tube 2 from axially coming off. Preferably, a notch portion is provided on the second elastic claw ring 7, which can make it more convenient to snap the second elastic claw ring 7 into the second groove 12. The second elastic claw ring 7 is preferably made of a high-strength and good-elastic metal sheet material, with high strength and strong deformation ability.

[0050] In some embodiments of the present application, as Figure 2 、 5 shown, an observation port 26 penetrating the inner and outer sides of the outer tube 2 is provided on the outer tube 2 for observing the position of the pipe in the annular insertion groove 5. The observation port 26 can be used to check the position of the pipe in the annular insertion groove 5, which is convenient for confirming whether the pipe is installed in place.

[0051] Specifically, as Figure 2 、 11 、13、14 shown, it further includes an indicating ring 8 slidably arranged on the inner wall of the outer tube 2. The indicating ring 8 is arranged in the annular insertion groove 5 and axially located between the first clamping point 33 and the inner opening of the observation port 26. Small protrusions are evenly distributed on the outer circle of the indicating ring 8, and the diameters of these protrusions are slightly larger than the inner wall diameter of the outer tube 2, so as to achieve an interference fit to prevent the indicating ring 8 from sliding out during the transportation or storage of the pipe fitting. After the pipe is inserted into the annular insertion groove 5, the pipe abuts against the indicating ring 8 and pushes the indicating ring 8 to move backward. When the end face of the pipe pushes the indicating ring 8 to the rear end of the annular insertion groove 5 and can be seen through the observation port 26, it indicates that the installation is completed.

[0052] The installation process of this application is as follows: First, the sealing ring 6 and the second elastic claw ring 7 are respectively sleeved on the first groove 11 and the second groove 12 of the inner tube 1. Then, the indicating ring 8 is installed on the inner wall of the outer tube seat 24, and the installation position is close to the snap ring 21. Next, the first elastic claw ring 3 is snap-connected to the snap ring 21. Then, the positioning part 45 is attached to the first mounting ring 31. Then, the tightening ring 441 is sleeved on the outer periphery of the sleeve 442, and the combination of the two, that is, the tightening part 44, is axially moved close to the front side of the positioning part 45 together, so that the tightening ring 441 abuts against the positioning part 45. Finally, the outer tube body 25 is circumferentially sleeved on the tightening part 44 and is screwed and tightened with the outer tube seat 24 to complete the assembly.

[0053] As Figure 12 , 16 , as shown in FIGS. 17, the second object of this application is to provide a tube taking device 9, including: a jacking part 91 and a sleeving part 92. The jacking part 91 is connected to the end face of the sleeving part 92. The jacking part 91 is used to insert into the annular insertion groove 5 as described above to take out the pipe. The jacking part 91 extends into the annular insertion groove 5 and abuts against the front end of the elastic tightening ring 4. The elastic tightening ring 4 moves axially backward, abutting the first elastic claw ring 3 against the snap ring 21, loosening the connection between the connecting joint and the pipe. At this time, the pipe can be taken out. After the jacking part 91 leaves the annular insertion groove 5, the first clamping point 33 and the second clamping point 43 are reset and can be used repeatedly. The tube taking device 9 is preferably made of an elastic material, and its shape is preferably an annular structure slightly larger than a semi-circle. The opening of the tube taking device 9 is clamped on the pipe, and the tube taking device 9 can be clamped on the pipe with a little force, which is convenient to use.

[0054] The disassembly process of this application is as follows: The tube taking device 9 is sleeved on the pipe, so that the jacking part 91 faces the rear side of the annular insertion groove 5. Hold the sleeving part 92 and apply an axial force to make the tube taking device 9 axially displace. The jacking part 91 abuts against the front end face of the sleeve 442. Push the sleeve 442 backward forcefully, so that the rear end face of the sleeve 442 abuts against the first reverse tooth piece 32 of the first elastic claw ring 3, deforming the first reverse tooth piece 32. At this time, both the first clamping point 33 and the second clamping point 43 have no clamping effect, and the pipe can be easily axially pulled out. After the tube taking device 9 is released, the first reverse tooth piece 32 of the first elastic claw ring 3 returns to the initial free state size due to its own elasticity and can be installed and used repeatedly. The entire installation and disassembly process does not require professional personnel and other special installation tools, is simple to operate, time-saving and labor-saving, can save installation costs more, can be installed and used repeatedly, and is environmentally friendly.

[0055] In summary, for the connection joint and the pipe taking device 9 of the present application, an annular insertion groove 5 for inserting a pipe is formed by the cooperation and limitation of the inner pipe 1 and the outer pipe 2, so as to connect the pipes. Through the first reverse tooth pieces 32 that extend inwards on the first elastic claw ring 3 and gradually incline backwards from outside to inside, and the reverse tooth portions 42 that extend inwards on the elastic tightening ring 4 and gradually incline backwards from outside to inside, the pipe is clamped in the current position to prevent it from coming out, and it will not affect the insertion of the pipe. At the same time, the pipe can be easily taken out through the pipe taking device 9, and the installation and disassembly are convenient, and the fixing effect is good.

[0056] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present application.

Claims

1. A connection joint, characterized in that, it comprises: an inner tube, an outer tube, a first elastic claw ring and an elastic tightening ring. The outer tube is sleeved outside the inner tube. The rear end of the outer tube is connected to the inner tube, and an annular insertion groove is defined between the outer tube and the inner tube. The annular insertion groove is open towards the front end; a snap ring is provided on the inner wall of the outer tube. Both the first elastic claw ring and the elastic tightening ring are arranged in the annular insertion groove. The elastic tightening ring is installed on the inner wall of the outer tube and is located on the front side of the snap ring. A card slot is defined between the rear side of the elastic tightening ring and the front side of the snap ring; the first elastic claw ring includes a first mounting ring and first inverted tooth pieces connected to the inner side of the first mounting ring. The first mounting ring is fitted and clamped in the card slot. The first inverted tooth pieces extend inwards and gradually incline backwards from outside to inside. The first inverted tooth pieces and the inner tube define a first clamping point; a first conical surface is provided on the inner wall of the outer tube. The first conical surface is spaced on the front side of the snap ring. The inner diameter of the first conical surface gradually increases from front to back. The elastic tightening ring has a second conical surface that cooperates and abuts against the first conical surface. An inverted tooth portion is provided on the inner wall of the elastic tightening ring. The inverted tooth portion extends inwards and gradually inclines backwards from outside to inside. A second clamping point is defined between the inverted tooth portion and the inner tube; the elastic tightening ring includes a tightening portion and a positioning portion. The tightening portion abuts against the front side of the positioning portion. The second conical surface is provided on the outer wall of the tightening portion. The positioning portion and the snap ring define the card slot. The inverted tooth portion is provided on the inner wall of the tightening portion; an axially rearward extending convex ring is provided on the outer periphery of the positioning portion. The convex ring and the snap ring define a card slot; the tightening portion includes a tightening ring and a sleeve arranged inside the tightening ring. The inner wall of the tightening ring is connected to the outer wall of the sleeve. The tightening ring abuts against the front side of the positioning portion. The inverted tooth portion is provided on the inner wall of the sleeve; the rear end face of the sleeve is arranged close to the front side of the first inverted tooth piece. A first step is provided on the tightening ring. The sleeve is provided with a second step that axially cooperates and is clamped with the first step to limit the sleeve from moving towards the pipe orifice direction; the positioning portion, the tightening ring and the sleeve are three independent components.

2. The connection joint according to claim 1, characterized in that, the outer tube includes an outer tube seat and an outer tube body. The outer tube seat is sleeved outside the inner tube. The outer tube body is connected to the outside of the outer tube seat. The snap ring is provided on the front side of the outer tube seat and is located inside the outer tube body. The first conical surface is provided on the inner wall of the outer tube body.

3. The connection joint according to claim 1, characterized in that, it further includes a sealing ring. A first groove is provided on the outer wall of the inner tube. The sealing ring is arranged in the first groove.

4. The connection joint according to claim 1, characterized in that, It further includes a second elastic claw ring, which includes a second mounting ring and second reverse tooth pieces. A second groove is provided on the outer peripheral wall surface of the inner tube. The second mounting ring is arranged in the second groove. The second reverse tooth pieces are connected to the front side of the second mounting ring and incline backward from the outside to the inside. The outer diameter of the second reverse tooth pieces is larger than the diameter at the connection position of the outer tube and the inner tube.

5. The connecting joint according to claim 1, characterized in that, an observation port penetrating through the inner side and the outer side of the outer tube is provided on the outer tube for observing the position of the pipe material in the annular insertion groove.

6. The connecting joint according to claim 5, characterized in that, it further includes an indicating ring slidably arranged on the inner wall of the outer tube. The indicating ring is arranged in the annular insertion groove and axially located between the first clamping point and the inner side opening of the observation port.

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