Method for replacing ship candling raw copper pipe

Abstract

The invention discloses a method for replacing a ship candling copper pipe. The method comprises the steps that a water leakage copper pipe is determined; a rod with self-tapping threads is adopted to be inserted into one end of the to-be-replaced copper pipe, and the rod is drawn to repeatedly impact the to-be-replaced copper pipe till the to-be-replaced copper pipe is loosened; when the to-be-replaced copper pipe is loosened, the chain is connected with the other end of the to-be-replaced copper pipe, the rod is pulled, and the to-be-replaced copper pipe and the chain are pulled out together; a chain is connected with the new copper pipe, the chain is drawn, the new copper pipe is inserted into a flange hole of a ship cantor, and the chain is detached; and the water tightness is improved. According to the method, a damaged copper pipe located in a partition is found in a reverse back pressure mode, the damaged copper pipe is stably attached to the wall of a bobbin through self-tapping threads of a rod, then the rod is drawn, the copper pipe is separated from a hole in the end face of a flange through vibration, a new copper pipe is installed through a chain with a guiding function, and the task of replacing the copper pipe is safely and effectively completed; and the quality of the ship after replacement is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of ship maintenance, and in particular relates to a method for replacing a ship's Kangdingsheng copper tube. Background Art

[0002] A ship's steam generator is a special device that converts steam into kinetic energy. It is divided into atmospheric steam generators and boiler steam generators. Atmospheric steam generators are used to collect steam from boilers and use this steam to heat fuel oil and heating pipes in oil tanks. They also provide steam power for the operation of equipment such as steam turbines. Boiler steam generators use boiler steam to heat water. The water produced can be used for daily life by the crew and can also be used to warm the cylinders when the main engine is started. A steam generator consists of a shell and copper tubes. The shell contains several copper tubes, and the gaps between the shell and the copper tubes, as well as the spaces between the copper tubes, form an air cavity. The water in the copper tubes is heated by the steam in the air cavity and becomes hot water. As the steam flows through the air cavity, the air cavity acts as a steam storage and guides the steam for transportation, reducing the pressure and cooling the steam in the process.

[0003] When the Kangdingsheng is operating at high temperatures, the water in the copper tubes, originally slightly soluble in water, will precipitate calcium sulfate due to evaporation. At the same time, carbonate ions in the water will combine with calcium and magnesium ions to form water-insoluble calcium carbonate and magnesium carbonate precipitates, causing the copper tubes to clog. As the water continues to evaporate and concentrate, the alkaline content in the water continues to increase. When it reaches saturation, scale will form. The thermal conductivity of scale is extremely low. When it adheres to the heated surface of the Kangdingsheng copper tubes, it will significantly deteriorate the heat transfer or cooling effect, reducing the cooling or heating efficiency. Moreover, this can cause damage to the metal material due to local overheating, and in severe cases, even cause pipe burst accidents.

[0004] Due to the special structure of the ship's boiler duct, there are multiple layers of partitions in the duct, and the copper flange holes at both ends are not visible. The copper pipes are fastened by the flanges, making it difficult to extract. Currently, if some of the copper pipes in the ship's boiler duct or atmospheric duct are damaged, they are blocked. If most of them are damaged, the entire ship's boiler duct or atmospheric duct must be replaced, which is very expensive. Therefore, there is an urgent need for a method to replace the copper pipes in the ship's duct, determine the location of the copper pipe perforation, blockage, or burst, and complete the copper pipe replacement. Summary of the Invention

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for replacing a ship's Kangdingsheng copper tube, comprising:

[0007] Identify the damaged copper pipe: open the end caps at both ends of the ship's Kangdingsheng, inject tap water into the air cavity, find the leaking copper pipe and mark it as the copper pipe to be replaced;

[0008] Pull out the copper tube to be replaced: insert a rod with self-tapping screws into one end of the copper tube to be replaced, pull the rod to repeatedly hit the copper tube to be replaced until the copper tube to be replaced is loose; when the copper tube to be replaced is loose, connect a chain to the other end of the copper tube to be replaced, pull the rod, and pull out the copper tube to be replaced together with the chain;

[0009] Replace the new copper tube: make a new copper tube according to the size of the copper tube to be replaced, connect the chain to the copper tube, pull the chain, pass the new copper tube through several layers of baffles in the ship's sill, and then insert it into the flange hole of the ship's sill, and remove the chain;

[0010] Improve water tightness: enlarge the apertures at both ends of the new copper tube until the outer periphery of the new copper tube fits in with the hole wall of the flange.

[0011] As a further solution of the present invention: it also includes making a rod, which includes a rod body and a first sleeve, one end of the rod body is provided with a self-tapping screw, the first sleeve is sleeved on the circumference of the rod body, and the first sleeve slides on the rod body.

[0012] As a further solution of the present invention: the other end of the rod body is sleeved with a second sleeve, and the second sleeve is fixedly connected to the rod body.

[0013] As a further solution of the present invention: a circular plate is provided at the end of the second sleeve, and the sleeve and the circular plate are integrally formed.

[0014] As a further solution of the present invention: an anti-slip cloth is provided on the outer periphery of the first sleeve.

[0015] As a further solution of the present invention, the method further comprises: making a tapered plug, welding the chain to the end surface of the large end of the tapered plug, and inserting the small end of the tapered plug into the copper tube to be replaced;

[0016] Pull the rod to pull out the copper tube to be replaced together with the chain; remove the cone plug from the copper tube to be replaced, and insert the small end of the cone plug into the new copper tube; pull the chain, and when the new copper tube is inserted into the flange hole of the ship's Kangdingsheng, remove the cone plug from the new copper tube.

[0017] As a further solution of the present invention: the step of improving water tightness also includes: inserting a pipe expansion rod on an electric drill into the inner diameter of the new copper pipe to expand the pipe, and the pipe expansion rod is a long tapered rod.

[0018] As a further solution of the present invention: the step of improving water tightness also includes: after cleaning the flange hole, the new copper tube is inserted into the flange hole; and the tube expansion process is carried out in a step-by-step manner to evenly fit the tube mouth of the new copper tube to the flange hole.

[0019] As a further solution of the present invention: the step of replacing the new copper tube further includes: the end surface of the new copper tube has no burrs, and the arc angle of the end surface of the new copper tube is ≤0.3mm.

[0020] As a further solution of the present invention: the rod and the chain are made of iron or steel.

[0021] Beneficial effects of the present invention:

[0022] A method for replacing copper tubes in ship construction. First, reverse back pressure is used to locate the damaged copper tube located in the bulkhead. Next, the self-tapping screws of a rod are used to firmly adhere the rod to the wall of the barrel. The rod is then pulled to allow the copper tube to detach from the hole in the flange end through vibration. Afterwards, a chain with a guiding function is used to guide the new copper tube through the holes corresponding to the several layers of bulkheads in the blind area of ​​the shell until the corresponding position hole on the flange end face at the other end of the shell is found, thereby completing the replacement of the copper tube. Practical production tests have shown that this method for replacing copper tubes in ship construction can safely and effectively complete the task of replacing copper tubes, ensure the quality of the replaced ship construction, and help shipowners shorten the ship repair cycle and save the cost of purchasing new ship construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a flow chart of a method for replacing a ship's Kangdingsheng copper tube;

[0024] Figure 2 It is a structural diagram of a ship Kangdingsheng;

[0025] Figure 3 yes Figure 2 AA section view;

[0026] Figure 4 This is a schematic diagram of the structure of another type of ship, Kangdingsheng;

[0027] Figure 5 It is a structural diagram of the rod;

[0028] Figure 6 The present invention is a schematic diagram of a method for replacing a copper tube of a ship's Kangdingsheng copper tube;

[0029] As shown in the figure: 1-shell, 11-steam inlet, 12-steam outlet, 2-copper tube, 3-air cavity, 4-flange, 5-end cover, 51-water inlet, 52-water outlet, 6-baffle;

[0030] 71-rod body, 711-self-tapping screw, 72-first sleeve, 73-second sleeve, 731-circular plate;

[0031] 8-Chain. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. It should be understood that this application is not limited to the example embodiments disclosed herein. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, and therefore cannot be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] like Figure 2 and 3As shown, the boiler of a ship or an atmospheric boiler comprises a shell 1 and copper tubes 2. Several copper tubes 2 are arranged in the shell 1. The gaps between the shell 1 and the copper tubes 2, and the spaces between the copper tubes 2 and the copper tubes 2 form an air cavity 3. The two ends of the copper tubes 2 are respectively inserted into the holes of the flange 4, which is connected to the shell 1. Therefore, the copper tubes 2, the flange 4, and the shell 1 can seal the air cavity 3. The circumferential surface of the shell 1 is provided with a steam inlet 11 and a steam outlet 12. Steam enters the air cavity 3 from the air inlet. End covers 5 are provided at both ends of the shell 1, one of which is provided with a water inlet 51 and a water outlet 52. The water in the copper tubes 2 is heated by steam to become hot water.

[0037] On the one hand, in order to maintain water tightness, the pipe opening of the copper pipe 2 in the flange hole is tightly matched with the flange hole, and the diameter of the pipe opening of the copper pipe 2 is slightly larger than the diameter of other parts of the copper pipe 2. Therefore, the two ends of the copper pipe can be pulled out only after they fall off from the flange hole. On the other hand, if Figure 4 Inside the shell 1, several layers of baffles 6 are installed. These baffles 6 provide support for the copper tubes 2 and guide the fluid evenly through all the heat exchange tubes, preventing localized low or high flow rates. Therefore, to remove the copper tube 2, it must be detached from the flange 4 and removed through the multiple baffles 6. During the replacement process, the multiple baffles 6 and the opposing flange holes create a blind spot, making it impossible for the operator to confirm whether the copper tube 2 has fully passed through all the baffles 6.

[0038] Therefore, if Figure 1-6 As shown, a method for replacing a ship's Kangdingsheng copper tube is provided, comprising:

[0039] Identify the damaged copper tube 2: open the end caps 5 at both ends of the ship's Kangdingsheng, inject tap water into the air cavity 3, find the leaking copper tube 2 and mark it as the copper tube 2 to be replaced;

[0040] Pull out the copper tube 2 to be replaced: insert a rod with a self-tapping screw 711 into one end of the copper tube 2 to be replaced, and repeatedly pull the rod to hit the copper tube 2 to be replaced until the copper tube 2 to be replaced is loosened; when the copper tube 2 to be replaced is loose, connect the chain 8 to the other end of the copper tube 2 to be replaced, pull the rod, and pull out the copper tube 2 to be replaced together with the chain 8;

[0041] Replace the new copper tube 2: make a new copper tube 2 according to the size of the copper tube 2 to be replaced, connect the chain 8 to the new copper tube 2, pull the chain 8, pass the new copper tube 2 through several layers of baffles 6 in the ship's Kangdingsheng, and then insert it into the flange hole of the ship's Kangdingsheng, and remove the chain 8;

[0042] Improve water tightness: enlarge the apertures at both ends of the new copper tube 2 until the outer periphery of the new copper tube 2 fits with the hole wall of the flange 4 .

[0043] Specifically, open the end covers 5 at both ends and fill the air cavity 3 in the shell 1 with tap water. Since the shell 1, copper tube 2 and flange 4 are connected to each other, the air cavity 3 in the shell 1 is in a sealed state. If a copper tube 2 is damaged, water will leak from the two ends of the copper tube 2. In this way, the damaged copper tube 2 can be found and marked as the copper tube 2 to be replaced.

[0044] One end of the copper tube 2 is connected to the first flange 4, and the other end is connected to the second flange 4. The hole of the flange 4 is called a flange hole, and is therefore divided into a first flange hole and a second flange hole.

[0045] In order to maintain watertightness, the pipe mouth of the copper tube 2 in the flange hole is tightly matched with the flange hole. The diameter of the pipe mouth of the copper tube 2 is slightly larger than the diameter of other parts of the copper tube 2. Therefore, the rod with the self-tapping screw 711 can pass through the pipe mouth of the copper tube 2 and continue to penetrate deeper, interlocking with the inner wall of the copper tube 2 to form a fixed connection.

[0046] Insert the rod into the copper tube 2 from the side of the first flange 4. The self-tapping screw 711 of the rod is tightly connected to the inner wall of the copper tube 2. Due to the high steam and air pressure in the air cavity 3, the copper rod cannot be pulled out by directly pulling the rod. Therefore, the first flange 4 is struck or knocked to vibrate the copper tube 2. Since the copper tube 2 is made of copper, which is soft, under the action of vibration and the continuous pulling and pulling action, the diameter of the copper tube 2 opening in the first flange hole and the diameter of the copper tube 2 opening in the second flange hole will gradually decrease. Therefore, the copper tube 2 can be slowly pulled out from the side of the first flange 4. Due to the high pressure in the air cavity 3, the baffle 6 is in contact with the copper tube 2. Therefore, during the extraction process, the impact or knocking should be continued, and the pulling and pulling should be repeated until the copper tube 2 to be replaced is completely pulled out. In particular, during the impact process, there is a rebound force, which will not damage the second flange hole.

[0047] like Figure 6 As shown, the upper part indicates the extraction of the copper tube 2 to be replaced, and the lower part indicates the replacement of the new copper tube 2. When the copper tube 2 is just loose and is about to fall off from the second flange hole, a chain 8 is connected to the copper tube 2 on the side of the second flange 4. During the process of extracting the copper tube 2 to be replaced, the chain 8 passes through the second flange hole, several baffle 6 holes and the first flange hole. The chain 8 plays a guiding role: the chain 8 provides a guiding path for the subsequent new copper tube 2 to pass through multiple layers of partitions. When the new copper tube 2 is in the blind spot inside the shell 1 and needs to pass through the corresponding hole of the partition, the chain 8 can assist in adjusting the angle of the new copper tube 2 to ensure that it can accurately find the corresponding position holes on several layers of partitions in the blind spot, as well as the matching hole positions on the end face of the copper flange, thereby effectively avoiding the problem of incorrect arrangement of the copper tube 2 due to passing through the wrong holes.

[0048] Make a new copper tube 2 of the same length and diameter as the copper tube 2 to be replaced, connect the new copper tube 2 to the chain 8 removed from the copper tube 2 to be replaced, pull the new copper tube 2 from the second flange 4 side, and under the guidance of the chain 8, the new copper tube 2 smoothly passes through the first flange hole, several baffle 6 holes and the second flange hole, and remove the chain 8.

[0049] When the new copper tube 2 is replaced, the copper tube 2 and the flange hole are in a clearance fit. It is necessary to expand the diameter of the copper tube 2 located at the first flange hole and the second flange hole to achieve a watertight effect so that it fits the hole wall of the flange hole.

[0050] A method for replacing a ship's copper tube, first, using reverse back pressure to find the damaged copper tube 2 located in the bulkhead; then, using the self-tapping screw 711 of the rod to firmly adhere it to the tube wall, and then pulling the rod to vibrate to allow the copper tube 2 to detach from the flange end hole; then, using a chain 8 with a guiding function, with the help of the chain 8, the new copper tube 2 is guided to smoothly pass through the holes corresponding to several layers of bulkheads in the blind area of ​​the shell 1, until the corresponding position hole on the flange end face of the other end of the shell 1 is found, thereby completing the replacement of the copper tube 2. Practical production tests have shown that this method of replacing a ship's copper tube can safely and effectively complete the task of replacing the copper tube 2, ensure the quality of the replaced ship's copper tube, and at the same time help shipowners shorten the ship repair cycle and save the cost of purchasing a new ship's copper tube.

[0051] In this embodiment, it also includes, Figure 5 As shown, a rod is manufactured. The rod comprises a rod body 71 and a first sleeve 72. One end of the rod body 71 is provided with a self-tapping screw 711. The first sleeve 72 is sleeved around the circumference of the rod body 71 and slides on the rod body 71. The other end of the rod body 71 is sleeved with a second sleeve 73, which is fixedly connected to the rod body 71. A circular plate 731 is provided at the end of the second sleeve 73. The sleeve and circular plate 731 are integrally formed. The outer circumference of the first sleeve 72 is covered with anti-slip fabric.

[0052] Specifically, the rod body is a solid iron rod more than one meter long, and its specific length is greater than the length of the copper tube 2. There is a self-tapping screw 711 at one end of the rod body, a slidable first sleeve 72 in the middle, and a second sleeve 73 at the other end. When the rod body penetrates into the copper tube 2 to be replaced, pulling the first sleeve 72 can effectively hit the first flange 4. Compared with other tools, pulling the first sleeve 72 allows the operator to complete the task of pulling out the copper tube 2 to be replaced more easily. The second sleeve 73 is to limit the sliding stroke of the first sleeve 72 and prevent the first sleeve 72 from falling off the rod body; wherein, there is an integrally formed circular plate 731 at the end of the second sleeve 73. When the rod body continues to extend into the copper tube 2 to be replaced, one hand holds the circular plate 731 to control the rod body, and the other hand pulls the first sleeve 72, which makes the operation more convenient. In addition, a non-slip cloth is provided on the outer periphery of the first sleeve 72 to prevent the first sleeve 72 from falling out of the hand during continuous pulling and pulling. The protective cloth can be made of cloth or rubber material and bonded to the first sleeve 72, or it can be set separately and placed between the hand and the first sleeve 72 when necessary.

[0053] In this embodiment, the process further includes: making a tapered plug, welding a chain 8 to the end face of the large end of the tapered plug, and inserting the small end of the tapered plug into the copper tube 2 to be replaced.

[0054] Pull the rod to pull out the copper tube 2 to be replaced together with the chain 8; remove the cone plug from the copper tube 2 to be replaced, and insert the small end of the cone plug into the new copper tube 2; pull the chain 8, and when the new copper tube 2 is inserted into the flange hole of the ship's Kangdingsheng, remove the cone plug from the new copper tube 2.

[0055] Specifically, before the copper tube 2 falls off and is about to be pulled out, a chain is inserted through the second flange side of the copper tube 2 and pulled out together. To more securely guide the new copper tube 2 through the multiple layers of barriers in the blind area of ​​the shell 1 and find the corresponding hole, a tapered plug is machined. Chain 8 is welded to the large end of the plug. The small end of the plug is inserted into the copper tube 2 and hammered firmly. Be careful not to tighten it too much, as the plug will need to be pulled out later.

[0056] In this embodiment, the step of replacing the new copper tube 2 further includes: the end surface of the new copper tube 2 is free of burrs, and the arc angle of the end surface of the new copper tube 2 is ≤0.3 mm.

[0057] Specifically, after the copper tube 2 to be replaced is pulled out, find a new copper tube 2 according to the size of the copper tube 2 to be replaced, cut out a new copper tube 2 of the same length as the old tube, and use a file to smooth the burrs on both ends of the cut new copper tube 2. Note that if using a grinder to grind off the burrs, be careful not to damage the outer diameter curvature of the copper tube 2, so as not to affect the subsequent pipe expansion and fitting watertightness.

[0058] In this embodiment, the watertightness improvement step further includes inserting an expanding rod, a tapered rod, into the inner diameter of the new copper tube 2 to expand the tube. After cleaning the flange hole, the new copper tube 2 is inserted into the flange hole. The expansion process is performed gradually to ensure that the opening of the new copper tube 2 is evenly aligned with the flange hole.

[0059] Specifically, before inserting the new copper tube 2, clean the flange hole. Use an electric drill, put on the drill sleeve and insert the expansion rod, which is a 200mm tapered rod. When expanding the copper tube 2 in the flange hole, pay attention to the following points:

[0060] During the crossing process, there must be no dust in the flange hole wall, otherwise it will affect the watertightness. After wiping the dust in the flange hole with a rag, the new copper pipe 2 is inserted into the flange hole to ensure the watertightness of the subsequent pipe expansion.

[0061] When expanding the pipe, the expansion rod's own tapered characteristics are used to generate rotational friction with the inner wall of the copper tube 2, thereby gradually expanding the pipe opening toward the flange hole. During operation, the principle of gradual progress should be strictly followed to ensure that the pipe opening can fit evenly and tightly. Never force a large section of the expansion rod into the pipe at once, or forcibly rotate the expansion rod; never manually swing the expansion rod up and down or left and right, similar to the way of bending the pipe opening to perform expansion operations. Such improper operation can easily cause uneven expansion of the pipe opening, which in turn causes subsequent water leakage problems.

[0062] In the present embodiment, rod and chain 8 are made of iron or steel. Since the copper pipe 2 of the ship's Kangdingsheng is long, it is necessary to stably connect, and it is more reliable for the tool to use this type of metal material of iron or steel.

[0063] To sum up, a method for replacing the copper tube of a ship's Kangdingsheng is provided. The method uses reverse back pressure to find the damaged copper tube 2 located in the partition, uses the self-tapping screw 711 of the rod to make it firmly adhere to the tube wall, and then uses the handshake sleeve to pull the rod to make the copper tube 2 separate from the flange end hole through vibration. The new copper tube 2 is installed using a chain 8 with a guiding function, and the task of replacing the copper tube 2 is completed safely and effectively. The problem that the thin-walled copper tube 2 in the ship's Kangdingsheng is difficult to replace after perforation, blockage, and bursting is solved, and the quality of the ship's Kangdingsheng after replacement is guaranteed.

[0064] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0065] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for replacing a ship's copper tube, characterized in that: include: Identify the damaged copper pipe: open the end caps at both ends of the ship's Kangdingsheng, inject tap water into the air cavity, find the leaking copper pipe and mark it as the copper pipe to be replaced; Pull out the copper tube to be replaced: insert a rod with self-tapping screws into one end of the copper tube to be replaced, pull the rod to repeatedly hit the copper tube to be replaced until the copper tube to be replaced is loose; when the copper tube to be replaced is loose, connect a chain to the other end of the copper tube to be replaced, pull the rod, and pull out the copper tube to be replaced together with the chain; Replace the new copper tube: make a new copper tube according to the size of the copper tube to be replaced, connect the chain to the new copper tube, pull the chain, pass the new copper tube through several layers of baffles in the ship's sill, and then insert it into the flange hole of the ship's sill, and remove the chain; Improve water tightness: enlarge the apertures at both ends of the new copper tube until the outer periphery of the new copper tube fits in with the hole wall of the flange.

2. The method for replacing a ship's Kangdingsheng copper tube according to claim 1, characterized in that: The method also includes making a rod, wherein the rod includes a rod body and a first sleeve, one end of the rod body is provided with a self-tapping screw, the first sleeve is sleeved on the circumference of the rod body, and the first sleeve slides on the rod body.

3. The method for replacing a ship's Kangdingsheng copper tube according to claim 2, characterized in that: The other end of the rod body is sleeved with a second sleeve, and the second sleeve is fixedly connected to the rod body.

4. The method for replacing a ship's Kangdingsheng copper tube according to claim 3, characterized in that: A circular plate is provided at the end of the second sleeve, and the sleeve and the circular plate are integrally formed.

5. The method for replacing a ship's Kangdingsheng copper tube according to claim 4, characterized in that: An anti-slip cloth is provided on the outer periphery of the first sleeve.

6. The method for replacing a ship's Kangdingsheng copper tube according to claim 1 or 5, characterized in that: Also includes: A cone plug is made, the chain is welded to the end surface of the large end of the cone plug, and the small end of the cone plug is inserted into the copper tube to be replaced; Pull the rod to pull out the copper tube to be replaced together with the chain; remove the cone plug from the copper tube to be replaced, and insert the small end of the cone plug into the new copper tube; pull the chain, and when the new copper tube is inserted into the flange hole of the ship's Kangdingsheng, remove the cone plug from the new copper tube.

7. The method for replacing a ship's Kangdingsheng copper tube according to claim 1, characterized in that: The step of improving water tightness also includes: inserting a pipe expansion rod on an electric drill into the inner diameter of the new copper pipe to expand the pipe, wherein the pipe expansion rod is a long rod with a taper.

8. The method for replacing a ship's Kangdingsheng copper tube according to claim 7, characterized in that: The step of improving water tightness further includes: after cleaning the flange hole, inserting the new copper pipe into the flange hole; and expanding the pipe in a step-by-step manner to evenly fit the pipe mouth of the new copper pipe to the flange hole.

9. The method for replacing a ship's Kangdingsheng copper tube according to claim 1, characterized in that: The step of replacing the new copper tube also includes: the end surface of the new copper tube has no burrs, and the arc angle of the end surface of the new copper tube is ≤0.3mm.

10. The method for replacing a ship's Kangdingsheng copper tube according to claim 1, characterized in that: The rod and the chain are made of iron or steel.

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