A double-flanged pipe connecting device and method thereof

Abstract

This invention relates to the technical field of connection devices and discloses a connection device and method for double-sided flange pipes. The device includes a fixed pipe and several nuts. Two connecting flanges are fixedly installed on the fixed pipe. Two sets of semicircular rings are movably fitted onto the fixed pipe, each set containing two semicircular rings. The screw and semicircular rings are a fixed integrated structure, allowing for pre-assembly. On-site connection eliminates the need to carry and align numerous loose bolts, effectively preventing bolt loss. With the limiting design of the rotating ring and the protrusion, the semicircular rings and screw are not easily detached. Pipe alignment is faster and installation is simpler, significantly shortening construction time. A pressure spring and washer are installed on the screw. When the nuts are tightened, the spring continuously stores force, forming uniform flexible pressure on the flange and sealing ring, ensuring a tight connection while avoiding excessive deformation and damage to the sealing ring caused by rigid compression. Combined with the sealing ring on the connecting pipe, this provides double protection for the internal sealing of the pipe, significantly reducing the risk of leakage.

Description

Technical Field

[0001] This invention relates to the technical field of connection devices, specifically to a connection device and method for double-sided flange pipes. Background Technology

[0002] In the fields of industrial fluid transportation, municipal pipe networks, chemical industry, HVAC and water supply and drainage pipeline engineering, double-sided flange pipes are widely used in the transfer, extension and repair of pipeline systems due to their bidirectional connection and convenient installation. At present, the connection of double-sided flange pipes mainly relies on the traditional flange bolt fastening structure to achieve the connection, that is, multiple sets of independent bolts and nuts pass through the double-sided flange and the flange of the pipe to be connected, and the sealing gasket is used to complete the mechanical fixation and sealing.

[0003] In practical use, this traditional connection method has several inherent defects: bolts are easy to lose, assembly efficiency is low, a large number of independent bolts are required for connection, bolts are scattered and easy to lose during on-site disassembly and assembly, and each bolt needs to be aligned. At the same time, the tightening process is a rigid extrusion, and the pressure is difficult to control evenly. Local overpressure can easily cause deformation and damage to the sealing ring, or insufficient pressure can cause leakage. With long-term use, the sealing performance deteriorates significantly. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a connection device and method for double-sided flange pipes, which has advantages such as avoiding bolt loss and avoiding damage to the sealing ring. It solves the problems of easy bolt loss, low assembly efficiency, the need to use a large number of independent bolts for connection, easy loss of bolts during on-site disassembly and assembly, the need to align each bolt individually, and the rigid extrusion process during tightening making it difficult to control pressure evenly. This can easily lead to deformation or damage of the sealing ring due to local overpressure, or leakage due to insufficient pressure, and significant degradation of sealing performance over long-term use.

[0005] To achieve the above-mentioned objectives of avoiding bolt loss and sealing ring damage, the present invention provides the following technical solution: a connection device for a double-sided flange pipe, comprising a fixed pipe and several nuts, two connecting flanges fixedly installed on the fixed pipe, two sets of semicircular rings movably sleeved on the fixed pipe, each set of semicircular rings containing two semicircular rings, the two semicircular rings in each set of semicircular rings can form a circular ring, several connecting pieces fixedly installed on each semicircular ring, and a screw fixedly installed on each connecting piece; Each screw is movably fitted with a pressure spring, each pressure spring is fixedly fitted with a gasket, and each gasket is respectively fitted with two connecting flanges. Two connecting pipes are fixedly installed on the inner wall of the fixed pipe, and each connecting pipe is movably fitted with a sealing ring.

[0006] Preferably, the fixed tube has an annular groove, and a rotating ring is movably connected inside the annular groove. Two protrusions are fixedly installed on the rotating ring, and each semicircular ring has a notch.

[0007] Preferably, a rubber tube is movably fitted onto both connecting flanges, a sleeve is movably fitted onto both rubber tubes, and a rubber strip is fixedly installed on each semicircular ring.

[0008] Preferably, a rotating tube is fixedly installed on both of the sleeves, and a set of semi-rings is provided on both the left and right sides of the fixed tube. Each set of semi-rings contains two semi-rings, and the two semi-rings in each set can form a circular ring. Each semi-ring has an arc groove, and each nut is movably connected to each arc groove.

[0009] Preferably, a semicircular tube is fixedly installed on each of the semicircular tubes, an arc-shaped strip is fixedly installed on each semicircular tube, and each arc-shaped strip can be combined in pairs to form a circular ring. A sealing strip is fixedly installed on each arc-shaped strip. Threaded grooves are opened on the inner sidewalls of the two rotating tubes, and threads are provided on each semicircular tube. Each semicircular tube is threadedly connected to each threaded groove.

[0010] Preferably, each of the rotating tubes has a plurality of protrusions a fixedly installed on its outer side wall, and each sleeve has a plurality of protrusions b fixedly installed on its outer side wall.

[0011] A method for using a double-sided flange pipe connection device, comprising the following steps: S1: Adjust the position of the protrusion by controlling the rotating ring to rotate back and forth. Then, align the notch with the protrusion and install the semi-circular ring. Finally, insert the screw into the hole of the connecting flange. S2: Connect the sleeve and the swivel pipe onto the two connecting flanges; S3: Align the device with the pipe, insert the connecting pipe into the pipe, insert the screw into the hole on the pipe flange, and then connect the nut to the screw. S4: Fit the arc groove on the semi-circular ring onto the nut, and then connect the threaded groove on the rotating tube with the thread on the semi-circular tube.

[0012] Compared with the prior art, the present invention provides a connection device and method for double-sided flange pipes, which has the following beneficial effects: The connection device and method for this double-sided flange pipe uses a fixed integrated structure of screw and semi-circular ring, which can be pre-assembled in advance. On-site connection does not require carrying or aligning a large number of scattered bolts, effectively preventing bolt loss. With the limiting design of rotating ring and protrusion, the semi-circular ring and screw are not easy to fall off. Pipe alignment is faster and installation is simpler, significantly shortening the construction time.

[0013] The connection device and method for this double-sided flange pipe uses a pressure spring and a gasket on the screw. When the nut is tightened, the spring continuously stores force, forming a uniform and flexible pressure on the flange and the sealing ring. This ensures a tight connection while avoiding excessive deformation and damage to the sealing ring caused by rigid compression. Together with the sealing ring on the connecting pipe, it provides double protection for the internal sealing of the pipe, significantly reducing the risk of leakage.

[0014] The connection device and method of this double-sided flange pipe form an outer shield through sleeve, rubber tube and rubber strip to isolate dust, water stains and corrosive media; semi-ring, arc strip and sealing strip completely seal the nut and thread to avoid thread corrosion, spring elasticity decay and connection loosening, significantly improve the overall service life of the joint and reduce the later maintenance cost.

[0015] The connection device and method for this double-sided flange pipe can axially limit the semi-circular ring by rotating the ring and the protrusion, preventing the semi-circular ring and the screw from falling off or shifting during assembly and use; the nut and the arc groove of the semi-circular ring are matched for positioning, further constraining the position of the connecting parts and improving the flange docking accuracy and structural stability.

[0016] The connection device and method for this double-sided flange pipe increases friction by setting a raised strip on the outside of the rotating pipe and the sleeve, making it easy to rotate by hand or with simple tools; the threaded connection protective structure is easy to disassemble and assemble, and subsequent maintenance and replacement of parts do not require damage to the main structure, making maintenance more convenient.

[0017] 6. The connection device and method of the double-sided flange pipe, by setting connecting flanges and connecting structures at both ends of the fixed pipe, can realize the simultaneous connection of bidirectional pipes. It is suitable for various scenarios such as pipe transfer, repair, and extension, and has strong versatility. Attached Figure Description

[0018] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a three-dimensional structural diagram of the fixing tube of the present invention; Figure 3 This is a three-dimensional structural diagram of the fixing tube of the present invention; Figure 4 This is a three-dimensional structural diagram of the fixing tube of the present invention; Figure 5 This is a three-dimensional structural diagram of the semi-circular ring of the present invention; Figure 6 This is a three-dimensional structural diagram of the semi-ring of the present invention; Figure 7 This is a three-dimensional structural diagram of the sleeve of the present invention.

[0019] In the diagram: 1. Fixed pipe; 2. Sleeve; 3. Rotating pipe; 4. Raised strip a; 5. Semicircular ring; 6. Semicircular pipe; 7. Semicircular ring; 8. Arc strip; 9. Rubber strip; 10. Rubber tube; 11. Connecting flange; 12. Sealing ring; 13. Connecting pipe; 14. Nut; 15. Notch; 16. Gasket; 17. Pressure spring; 18. Screw; 21. Arc groove; 22. Annular wall groove; 23. Rotating ring; 24. Raised block; 25. Connecting piece; 26. Sealing strip; 27. Raised strip b; 28. Threaded groove. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings, wherein the same parts are indicated by the same reference numerals. It should be noted that the terms “front”, “rear”, “left”, “right”, “upper” and “lower”, “bottom surface” and “top surface” used in the following description refer to the directions in the drawings, and the terms “inner” and “outer” refer to the directions toward or away from the geometric center of a specific part, respectively.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-7 The present invention provides a technical solution: a connection device and method for a double-sided flange pipe. In embodiment one, it includes a fixed pipe 1 and several nuts 14. Two connecting flanges 11 are fixedly installed on the fixed pipe 1. Two sets of semi-circular rings 5 ​​are movably sleeved on the fixed pipe 1. Each set of semi-circular rings 5 ​​contains two semi-circular rings 5. The two semi-circular rings 5 ​​in each set of semi-circular rings 5 ​​can form a ring. Several connecting pieces 25 are fixedly installed on each semi-circular ring 5. Each connecting piece 25 is fixedly installed with a screw 18. Each screw 18 is movably fitted with a pressure spring 17, and each pressure spring 17 is fixedly installed with a gasket 16. Each gasket 16 is respectively fitted with two connecting flanges 11. Two connecting pipes 13 are fixedly installed on the inner wall of the fixing pipe 1. Each connecting pipe 13 is movably fitted with a sealing ring 12. By inserting several screws 18 on each semi-circular ring 5 into the holes of the two connecting flanges 11 and then through the holes of the flanges on the pipes to be connected, the device can be connected to the pipes by using nuts 14 to connect with the screws 18. In this way, it is not necessary to carry a large number of bolts during installation and disassembly, thereby avoiding the loss of bolts. At the same time, the pressure spring 17 can store force when tightening the nut 14, thereby continuously applying pressure to fix the device to the pipes. At the same time, it can avoid excessive pressure on the sealing ring 12 due to hard squeezing, which may damage it and affect the sealing effect. In Example 2, based on Example 1, an annular groove 22 is provided on the fixed pipe 1. A rotating ring 23 is movably connected within the annular groove 22. Two protrusions 24 are fixedly installed on the rotating ring 23. Each semicircular ring 5 has a notch 15. By rotating the rotating ring 23, the protrusions 24 are aligned with one of the notches 15, allowing the semicircular ring 5 to be moved and removed. Similarly, the semicircular ring 5 can be installed. After the semicircular ring 5 is installed, the protrusions 24 are moved to another location. This allows the protrusions 24 to block the movement of the semicircular ring 5, thus limiting its position in conjunction with the screw 18. This prevents the semicircular ring 5 from detaching from the screw 18, thereby enabling the use of... Before use, install the semicircular ring 5 and the screw 18 to improve efficiency when connecting pipes. Rubber tubes 10 are movably fitted onto both connecting flanges 11, and sleeves 2 are movably fitted onto both rubber tubes 10. A rubber strip 9 is fixedly installed on each semicircular ring 5, and a rotating tube 3 is fixedly installed on each of the two sleeves 2. A set of semicircular rings 7 is provided on both sides of the fixed tube 1, and each set contains two semicircular rings 7. The two semicircular rings 7 in each set can form a circular ring. An arc-shaped groove 21 is provided on each semicircular ring 7, and each nut 14 is movably connected to each arc-shaped groove 21. A semicircular tube 6 is fixedly installed on each semicircular ring 7, and each semicircular tube 6 has... An arc-shaped strip 8 is fixedly installed, and each arc-shaped strip 8 can be combined in pairs to form a ring. A sealing strip 26 is fixedly installed on each arc-shaped strip 8. Threaded grooves 28 are opened on the inner walls of both rotating tubes 3. Each semi-circular tube 6 is threaded and connected to each threaded groove 28. Through the cooperation of the sleeve 2 with the rubber strip 9 and the rubber tube 10, the space between the sealing semi-circular ring 5 and the connecting flange 11 can be blocked, thereby preventing external dust and water stains from entering and causing corrosion damage to the pressure spring 17 and the screw 18. This improves the service life of the connection. After fixing the connection with the nut 14, the arc-shaped strip on the semi-circular ring 7 can be used to secure the connection. The groove 21 is fitted onto the nut 14, and then the threaded groove 28 on the rotating tube 3 is connected to the thread on the semi-circular tube 6. At the same time, the sealing strip 26 is used to seal the connection, thereby preventing external dust and water stains from contacting the nut and screw, thus improving the service life of the device. Several protrusions a4 are fixedly installed on the outer wall of each rotating tube 3, and several protrusions b27 are fixedly installed on the outer wall of each sleeve 2. The protrusions a4 and b27 make it convenient for the user to rotate the sleeve 2 and the rotating tube 3 back and forth. This makes it easy for the user to rotate the sleeve 2 and the rotating tube 3 when connecting the threaded groove 28 on the rotating tube 3 to the thread on the semi-circular tube 6.

[0023] A method for using a double-sided flange pipe connection device, comprising the following steps: S1: Adjust the position of the protrusion 24 by controlling the rotating ring 23 to rotate back and forth. Then, align the notch 15 with the protrusion 24 and install the semi-circular ring 5. Then, insert the screw 18 into the hole of the connecting flange 11. S2: Connect the sleeve 2 and the rotating pipe 3 to the two connecting flanges 11; S3: Align the device with the pipe, insert the connecting pipe 13 into the pipe, insert the screw 18 into the hole on the pipe flange, and then connect the nut 14 to the screw 18. S4: Fit the arc groove 21 on the semi-ring 7 onto the nut 14, and then connect the threaded groove 28 on the rotating tube 3 with the thread on the semi-circular tube 6.

[0024] Core Main Structure Fixed tube 1 As the main support component of the entire connection device, it is used to install all parts such as the connecting flange, semi-circular ring, and rotating ring, realizing the intermediate transfer of the pipelines at both ends.

[0025] Connecting flange 11 It is fixed to the fixed pipe and used to align and fit with the flange of the pipe to be connected, providing an installation base through which the screw passes to achieve the docking and fixing between the pipe flanges.

[0026] Connecting pipe 13 It is fixed to the inner wall of the fixed pipe and is used to insert into the inside of the pipe to be connected, so as to achieve radial positioning and guidance when the pipes are connected and ensure the coaxiality of the connection.

[0027] Sealing ring 12 It is fitted onto the connecting pipe and is squeezed and sealed after the pipes are connected, thus achieving a fluid seal inside the pipe and preventing media leakage.

[0028] Pre-assembly and connection fastening structure Semicircular ring 5 Two sets are symmetrically arranged, each set consisting of two pieces joined together to form a ring, which is movably sleeved on the fixed tube; serving as the bearing base for the screw, used to fix the connecting piece and the screw, and realizing the pre-installation of the screw.

[0029] Connecting piece 25 It is fixed on the semi-circular ring to support and fix the screw, so that the screw and the semi-circular ring are integrated and the screw is prevented from falling off.

[0030] Screw 18 Fixed to the connecting piece, it passes through the holes of the connecting flange and the pipe flange, and cooperates with the nut to achieve a flange locking connection, providing the main fastening force for pipe connection.

[0031] Compression spring 17 It fits onto the screw and provides continuous and uniform flexible clamping force when the nut is tightened, avoiding rigid compression that could damage the sealing ring.

[0032] Gasket 16 It is fixed to the end of the pressure spring and fits against the connecting flange to increase the spring's force-bearing area, ensure uniform pressure transmission, and protect the flange surface.

[0033] Nut 14 It connects to the screw thread and is used to lock the flange, thus securing the device to the pipe to be connected.

[0034] Limiting and anti-detachment structure Annular wall groove 22 It is installed on the fixed tube to accommodate and limit the rotating ring, ensuring that the rotating ring can rotate circumferentially but not axially.

[0035] Rotating ring 23 The movable part is connected in the annular wall groove and can be rotated manually to drive the protrusion to change position, thereby limiting and unlocking the semi-circular ring.

[0036] Bump 24 Fixed to the rotating ring, the notch of the semicircular ring is blocked by rotation, restricting the axial movement of the semicircular ring and preventing the semicircular ring from falling off the screw.

[0037] Gap 15 It is cut on the semi-circular ring and is used to cooperate with the protrusion to realize the assembly and disassembly of the semi-circular ring. The semi-circular ring can be installed or removed when the protrusion is aligned with the notch.

[0038] External protection and sealing structure Rubber hose 10 It is fitted onto the connecting flange and used in conjunction with the sleeve to buffer and seal the gap between the flange and the sleeve, reducing wear and blocking dust and moisture.

[0039] Sleeve 2 It is fitted onto the outside of the rubber tube and fixed to the rotating tube. It is used to shield the semi-circular ring and the connecting flange area, forming the first layer of external protection to prevent internal parts from being corroded.

[0040] Rubber strip 9 Fixed on the semi-circular ring, it fits with the inner wall of the sleeve, enhancing the seal between the semi-circular ring and the sleeve, and further preventing the intrusion of external impurities.

[0041] Raised strip b27 It is fixed to the outer wall of the sleeve to increase the rotational friction, making it convenient for users to rotate the sleeve by hand for assembly.

[0042] Threaded connection and nut protection structure Rotary tube 3 It is fixed to the sleeve, and the inner wall is provided with a threaded groove for connection with the semi-circular pipe thread to achieve locking and fixing of the external protective structure.

[0043] Threaded groove 28 It is located inside the rotating tube and mates with the external thread of the semi-circular tube to form a threaded locking pair, ensuring a firm connection of the protective structure.

[0044] A4 convex strip It is fixed to the outer wall of the rotating tube, which facilitates rotation and force application, and makes it easy to tighten or loosen the rotating tube.

[0045] Half Ring 7 Each set consists of two parts that fit together to form a ring, used to wrap around and position the nut, preventing it from loosening or shifting.

[0046] Arc groove 21 It is set on the semi-ring to lock the nut in place, restrict the circumferential rotation of the nut, and play a role in preventing loosening and positioning.

[0047] Semicircular tube 6 It is fixed on the semi-ring, and the outer wall is threaded to connect with the rotating pipe thread groove, supporting the semi-ring and achieving locking.

[0048] Arc strip 8 Fixed on the semi-circular tube, they are combined in pairs to form a ring, which is used to install the sealing strip and form an annular sealing surface.

[0049] Sealing strip 26 Fixed to the curved strip, it is squeezed and sealed after docking, sealing the nut and threaded area and completely isolating it from corrosive media.

[0050] In use, the first step is to insert several screws 18 on each semicircular ring 5 into the holes of the two connecting flanges 11, and then through the holes of the flanges on the pipe to be connected. The device can be connected to the pipe by connecting the screws 18 with the nut 14. This eliminates the need to carry a large number of bolts during installation and disassembly, thus avoiding the loss of bolts. At the same time, the pressure spring 17 can store force when tightening the nut 14, so that pressure can be continuously applied to fix the device to the pipe. This also avoids excessive pressure on the sealing ring 12 due to hard squeezing, which could damage the sealing effect.

[0051] Step 2: By rotating the rotating ring 23, the protrusion 24 is aligned with one of the notches 15, allowing the semi-circular ring 5 to be moved and removed. Similarly, the semi-circular ring 5 can be installed. After the semi-circular ring 5 is installed, the protrusion 24 is moved to another location. The protrusion 24 can then block the movement of the semi-circular ring 5, thus limiting its position in conjunction with the screw 18. This prevents the semi-circular ring 5 from falling off the screw 18, allowing the semi-circular ring 5 to be installed on the screw 18 before use, thereby improving efficiency when connecting pipes.

[0052] Step 3: By using sleeve 2 in conjunction with rubber strip 9 and rubber tube 10, the space between sealing semi-circular ring 5 and connecting flange 11 can be blocked, thereby preventing external dust and water stains from entering and causing corrosion damage to pressure spring 17 and screw 18, thus improving the service life of the connection.

[0053] Step 4: After fixing the connection using nut 14, the arc groove 21 on the semi-ring 7 can be fitted onto nut 14, and then the threaded groove 28 on the rotating tube 3 can be connected to the thread on the semi-circular tube 6. At the same time, the sealing strip 26 can be used to seal the connection, thereby preventing external dust and water stains from contacting the nut and screw, thus improving the service life of the device.

[0054] Step 5: The protrusions a4 and b27 allow the user to easily rotate the sleeve 2 and the rotating tube 3 back and forth. This makes it easier for the user to rotate the sleeve 2 and the rotating tube 3 when connecting the threaded groove 28 on the rotating tube 3 to the thread on the semi-circular tube 6.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection device for a double-sided flanged pipe, comprising a fixed pipe (1) and a plurality of nuts (14), wherein two connecting flanges (11) are fixedly installed on the fixed pipe (1), characterized in that: Two sets of semicircular rings (5) are movably sleeved on the fixed tube (1). Each set of semicircular rings (5) contains two semicircular rings (5). The two semicircular rings (5) in each set of semicircular rings (5) can form a circular ring. Several connecting pieces (25) are fixedly installed on each semicircular ring (5). A screw (18) is fixedly installed on each connecting piece (25). Each screw (18) is movably fitted with a pressure spring (17), and each pressure spring (17) is fixedly fitted with a gasket (16). Each gasket (16) is fitted with two connecting flanges (11). Two connecting pipes (13) are fixedly installed on the inner wall of the fixed pipe (1), and sealing rings (12) are movably fitted on the two connecting pipes (13).

2. The connection device for a double-sided flange pipe according to claim 1, characterized in that: The fixed tube (1) has an annular wall groove (22), and a rotating ring (23) is movably connected inside the annular wall groove (22). Two protrusions (24) are fixedly installed on the rotating ring (23), and a notch (15) is opened on each semicircular ring (5).

3. The connection device for a double-sided flange pipe according to claim 1, characterized in that: Both of the connecting flanges (11) are movably fitted with rubber tubes (10), both rubber tubes (10) are movably fitted with sleeves (2), and each semicircular ring (5) is fixedly fitted with a rubber strip (9).

4. The connection device for a double-sided flange pipe according to claim 2, characterized in that: Rotary tubes (3) are fixedly installed on both sleeves (2). A set of semi-rings (7) is provided on both the left and right sides of the fixed tube (1). Each set of semi-rings (7) contains two semi-rings (7). The two semi-rings (7) in each set of semi-rings (7) can form a circular ring. Each semi-ring (7) has an arc groove (21). Each nut (14) is movably connected to each arc groove (21).

5. A connection device for a double-sided flange pipe according to claim 4, characterized in that: Each of the semi-rings (7) is fixedly installed with a semi-circular tube (6), and each semi-circular tube (6) is fixedly installed with an arc strip (8). Each arc strip (8) can be combined in pairs to form a circular ring. Each arc strip (8) is fixedly installed with a sealing strip (26). The inner sidewalls of the two rotating tubes (3) are provided with threaded grooves (28). Each semi-circular tube (6) is provided with threads, and each semi-circular tube (6) is threadedly connected to each threaded groove (28).

6. A connection device for a double-sided flange pipe according to claim 4, characterized in that: Each of the rotating tubes (3) has several protrusions a (4) fixedly installed on its outer side wall, and each of the sleeves (2) has several protrusions b (27) fixedly installed on its outer side wall.

7. A method of using a double-sided flange pipe connection device, employing the double-sided flange pipe connection device according to any one of claims 1-6, comprising the following steps: S1: Adjust the position of the protrusion (24) by rotating the rotating ring (23) back and forth, then align the notch (15) with the protrusion (24) and install the semi-circular ring (5), and then insert the screw (18) into the hole of the connecting flange (11); S2: Connect the sleeve (2) and the rotating tube (3) onto the two connecting flanges (11); S3: Align the device with the pipe, insert the connecting pipe (13) into the pipe, insert the screw (18) into the hole on the pipe flange, and then connect the nut (14) to the screw (18). S4: Put the arc groove (21) on the semi-ring (7) onto the nut (14), and then use the threaded groove (28) on the rotating tube (3) to connect with the thread on the semi-circular tube (6).

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