Metal tube recess correction device and correction method

Abstract

The invention relates to the technical field of straightening and shaping of metal pipes, in particular to a metal pipe sinking correcting device and method. A metal pipe sinking correcting device comprises a fixing plate, a threaded pushing hole is formed in the fixing plate, the axis of the threaded pushing hole and the axis of a metal pipe are collinear after the fixing plate is installed on an end flange, the correcting device further comprises an ejector rod used for being assembled in the threaded pushing hole in a threaded mode and a correcting ball used for being placed in the metal pipe, the end, located in the metal pipe, of the ejector rod is used for abutting against the correcting ball and pushing the correcting ball to slide through the sunken part of the metal pipe under the action of the threaded pushing hole so as to eject out the sunken part of the metal pipe, and the hardness of the correcting ball is larger than that of the metal pipe. Therefore, the problems that in the prior art, when metal pipes are produced or transported, the metal pipes are prone to bumping and sinking, and the cost is high when the metal pipes with sinking are directly replaced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of straightening and restoring of metal pipes, and particularly relates to a metal pipe indentation correction device and a correction method. Background Art

[0002] Non-ferrous metals generally refer to other metals except iron and iron-based alloys. During the shipbuilding process, a large amount of metal pipes are required. Specifically, at the bottom of the ship, in order to avoid seawater corrosion of the metal, copper-based metals are often used. At the upper part of the ship, aluminum alloys are used for light weight considerations. Although non-ferrous metals have certain advantages, their strength is relatively weaker than that of steel. Especially when non-ferrous metal pipes are used inside the ship, in some scenarios, their pipe walls are thinner, and during production or transportation, it is difficult to avoid bumps, which may lead to local depressions and affect normal use. The cost of non-ferrous metal pipes is usually relatively high, and replacement will bring a large cost increase. Not only for non-ferrous metal pipes, even for metal pipes made of ferroalloys, if their pipe walls are thinner, they may also be bumped and deformed during production and transportation, resulting in increased costs. Summary of the Invention

[0003] In view of this, the present invention provides a metal pipe indentation correction device to solve the problem that during the production or transportation of metal pipes in the prior art, it is easy to cause the metal pipes to be bumped and indented, and the cost of directly replacing the indented metal pipes is relatively high; the present invention also provides a metal pipe indentation correction method to solve the above technical problems.

[0004] A metal pipe indentation correction device includes a fixing plate for fixedly installing on the end flange of the metal pipe. The fixing plate is provided with a threaded pushing hole. After the fixing plate is installed on the end flange, the axis of the threaded pushing hole is collinear with the axis of the metal pipe. The correction device further includes a push rod for being threadedly assembled in the threaded pushing hole and a correction ball for being placed inside the metal pipe. When in use, the push rod passes through the fixing plate. One end of the push rod located outside the metal pipe is a force application end for personnel to operate. One end of the push rod located inside the metal pipe is used to abut against the correction ball and push the correction ball to slide over the indented part of the metal pipe under the action of the threaded pushing hole to push out the indented part of the metal pipe. The hardness of the correction ball is greater than the hardness of the metal pipe.

[0005] Further, the push rod includes a push rod body and a correction ball top plate installed at the end of the push rod for abutting against the correction ball. The correction ball top plate is provided with a limiting spherical surface matching the correction ball.

[0006] Further, a stepped hole is provided at the axis of the correction ball top plate, and a threaded mounting hole corresponding to the mounting hole is provided on the top rod body to mount the correction ball top plate at the end of the top rod through a mounting screw. The depth of the large-diameter section of the stepped hole is greater than the height of the screw head of the mounting screw.

[0007] Further, the correction device further includes an annular pressing plate which is separately arranged and is hoop-mounted on the outer peripheral surface of the sunken part of the metal tube through a fastener. There are at least two annular pressing plates, and a plurality of annular pressing plates are arranged along the outer peripheral surface of the metal tube.

[0008] Further, the inner diameter dimension of the circle where the annular pressing plate is located is 0.2-0.5 mm larger than the outer diameter dimension of the metal tube.

[0009] Further, the diameter dimension of the correction ball is 0.1-0.2 mm smaller than the inner diameter dimension of the metal tube.

[0010] The beneficial effect of the metal tube sunken correction device in the present invention lies in that: in the present invention, the fixing plate is provided to facilitate the installation of the whole device relative to the metal tube. By providing a threaded push hole and a top rod adapted to the threaded push hole on the fixing plate, it is convenient for the top rod to move relative to the fixing plate and the metal tube, and in the form of threaded cooperation, it is convenient to convert the rotational motion into a linear motion and facilitate the provision of a large thrust. By providing a correction ball that can be placed inside the metal tube, it is convenient for the top rod to push the correction ball to move. When the correction ball passes through the sunken part inside the metal tube, it can generate an outward push on the sunken part, facilitating the repair of the sunken part without the need for replacement. In order to achieve the repair effect on the sunken part, the hardness of the correction ball is greater than the hardness of the metal tube. Thus, the problem in the prior art that when producing or transporting metal tubes, the metal tubes are prone to being bumped and sunken, and the cost of directly replacing the sunken metal tubes is relatively high is solved.

[0011] A method for correcting the sunken part of a metal tube, at least one correction ball is inserted into the metal tube, and a top push mechanism capable of pushing the correction ball is fixedly installed on the end flange of the metal tube. The top push mechanism includes a fixing plate and a top rod in threaded cooperation to push the correction ball through the sunken part of the metal tube by rotating the top rod.

[0012] Further, when the metal tube is a bent tube and the sunken part is located at a section far from the end flange, at least two correction balls are inserted into the metal tube so that the diameters of the plurality of correction balls are greater than the length from the turning point to the sunken part.

[0013] Further, a power tool with a gear is used to rotate the top rod. The high-speed gear of the power tool is used before the top rod pushes the correction ball to reach the sunken part, and the low-speed gear of the power tool is used after the correction ball contacts the sunken part.

[0014] Further, before correction, an annular pressing plate is installed on the outer side of the indented part of the metal pipe.

[0015] The beneficial effect of the metal pipe indentation correction method in the present invention lies in that: in the present invention, the correction ball is inserted into the metal pipe. In addition, a pushing mechanism is fixedly installed on the end flange of the metal pipe, which facilitates the movement of the pushing mechanism relative to the end flange, that is, it facilitates the movement of the push rod in the pushing mechanism relative to the metal pipe. During the movement, the correction ball will pass through the indented part, and while passing through the indented part, it will generate an outward pushing force on the indented part, thereby facilitating the repair of the indented part without replacement. Thus, it solves the problem in the prior art that when producing or transporting metal pipes, the metal pipes are easily knocked and indented, and directly replacing the indented metal pipes has a high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of an embodiment of the metal pipe indentation correction device in the present invention (the metal pipe to be repaired is a straight pipe);

[0018] Figure 2 Structural schematic diagram of an embodiment of the metal pipe indentation correction device in the present invention (the metal pipe to be repaired is a bent pipe);

[0019] Figure 3 Structural schematic diagram of the fixing plate in an embodiment of the metal pipe indentation correction device in the present invention;

[0020] Figure 4 Top view of the shaping mechanism in an embodiment of the metal pipe indentation correction device in the present invention;

[0021] Figure 5 Side view of the shaping mechanism in an embodiment of the metal pipe indentation correction device in the present invention.

[0022] The meanings of the reference numerals in the drawings are: 11, straight pipe; 12, bent pipe; 13, indented part; 14, end flange; 21, fixing plate; 22, first fastening bolt; 23, first fastening nut; 24, push thread hole; 25, through hole; 31, push rod body; 32, correction ball top plate; 33, mounting screw; 34, hexagonal section; 41, annular pressing plate; 42, second fastening bolt; 43, second fastening nut; 5, correction ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0024] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms "a", "the" and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the 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 thus should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of the description of the present invention, and they have no specific meaning in themselves. Therefore, "module" and "component" can be used interchangeably.

[0029] For a better understanding of the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0030] In Embodiment 1 of the metal pipe dent correction device (hereinafter referred to as the correction device) in the present invention:

[0031] In this embodiment, the correction device includes a correction ball. By adjusting the size of the correction ball, the diameter of the correction ball is made smaller than the inner diameter of the metal pipe but larger than the inner diameter of the sunken part on the metal pipe. Thus, after passing through, the correction ball can push the sunken part outwards, facilitating the repair of the sunken part. Preferably, the diameter of the correction ball is 0.1 - 0.2 mm smaller than the inner diameter of the metal pipe. That is, the correction ball can smoothly pass through the normal part of the metal pipe. However, when passing through the sunken part, since the inner diameter here has been reduced due to the sunken part, the correction ball cannot pass through smoothly. By applying an external force, the correction ball is forced to pass through the sunken part, so that the sunken part deforms outwards and is thus repaired. To achieve the movement of the correction ball and the application of external force, a pushing mechanism for pushing the correction ball is provided. At the same time, to avoid overcorrection, a shaping mechanism for shaping and protecting the metal pipe is also provided.

[0032] As Figure 1 and Figure 3 shown, at this time, taking the straight pipe 11 as an example of the metal pipe for introduction, the pushing mechanism includes a fixing plate 21 for being installed at the end flange 14 of the metal pipe. The fixing plate 21 is provided with through holes 25 adapted to the flange holes on the end flange 14, and their shapes, positions, and numbers correspond one by one for passing through the first fastening bolts 22. The fixing plate 21 and the end flange 14 are fixedly connected together by the first fastening bolts 22 and the first fastening nuts 23, so that the pushing mechanism has a fixed pushing base relative to the metal pipe. To achieve the pushing function, a threaded pushing hole is also provided at the central position of the fixing plate 21. A push rod is threadedly assembled in the threaded pushing hole. One end of the push rod is located inside the metal pipe, and the other end is located outside the metal pipe. By rotating the push rod, the push rod can make a reciprocating motion inside the metal pipe.

[0033] The ejector rod includes an ejector rod body 31 and a correction ball top plate 32 fixedly connected to the ejector rod body 31. The middle section of the ejector rod body 31 is set as a threaded section adapted to the pushing threaded hole 24. A hexagonal section 34 is provided at one end of the ejector rod body 31 located outside the metal pipe, which is convenient for cooperating with a wrench or other tools to rotate the ejector rod body 31. The end where the hexagonal section 34 is located also constitutes the force application end of the ejector rod. A limiting spherical surface adapted to the shape of the correction ball 5 is provided on the correction ball top plate 32. A stepped hole is also provided at the center position of the correction ball top plate 32. Threaded mounting holes corresponding to the stepped hole are provided on the ejector rod body 31 to install the correction ball top plate 32 at the end of the ejector rod through mounting screws 33. Since the correction ball top plate 32 needs to contact the correction ball 5, the mounting screws 33 need to be hidden. Therefore, the small-diameter hole of the stepped hole contacts the ejector rod body 31, and the large-diameter hole is used to accommodate the screw head of the mounting screw 33. Specifically, the depth of the large-diameter section of the stepped hole is greater than the height of the screw head of the mounting screw 33, so that the correction ball 5 will not contact the mounting screw 33.

[0034] The metal pipes have a variety of different size specifications, which makes the size of the correction ball 5 different when facing different metal pipes. By setting the ejector rod in a split form, when facing correction balls 5 with different diameters, the two can still be adapted by replacing the correction ball top plate 32, improving versatility. Of course, since the ejector rod needs to be inserted through the fixing plate 21, the split setting allows the correction ball top plate 32 to be installed after the insertion is completed, so that the size of the correction ball top plate 32 can be larger than the diameter of the ejector rod body 31, which is convenient for increasing the contact area with the correction ball 5 and dispersing the force. Since the diameter of the correction ball 5 is smaller than the diameter of the metal pipe, the limiting spherical surface can also reduce the extrusion of the normal part caused by the position shaking of the correction ball 5 during the pushing process.

[0035] Of course, in other embodiments, the ejector rod can also be integrally formed, and a limiting spherical surface is directly formed at the end of the ejector rod. The reason for setting it in a split form is that if facing metal pipes with different diameters at this time, the entire ejector rod needs to be replaced. Or, in other embodiments, a hexagonal groove can also be provided at one end of the ejector rod located outside the metal pipe, which is convenient for fitting with a hexagonal wrench. Of course, it can also be set in other forms. Or, in other embodiments, the limiting spherical surface adapted to the correction ball can no longer be provided, so that during the contact with the correction ball, the correction ball is controlled to move downward by pushing. Or, in other embodiments, it can also be as Figure 2 shown, for repairing the form of the bent pipe 12, multiple correction balls 5 need to be placed at this time, and the diameters of the multiple correction balls 5 are greater than the length from the turning point to the sunken part.

[0036] To avoid excessive deformation, that is, when correcting the sunken part, other normal pipelines are extruded outwards or the sunken part bulges too much, a shaping mechanism is also provided. Specifically, asFigure 4 and Figure 5 As shown in Figure 5 , the shaping mechanism includes two annular pressing plates 41 arranged separately, and each annular pressing plate 41 is semi-circular. At the ends of the two annular pressing plates 41, there are connecting flanges for installing the second fastening bolts 42, and holes for the bolts to pass through are provided on the connecting flanges. By installing the second fastening bolts 42 and the second fastening nuts 43, the two annular pressing plates 41 can be assembled into a circle. The diameter of the circle where the annular pressing plate 41 is located is equivalent to the diameter of the metal pipe. Specifically, the inner diameter of the circle where the annular pressing plate 41 is located is 0.2 - 0.5 mm larger than the outer diameter of the metal pipe, so as to prevent the two annular pressing plates 41 from extruding the metal pipe during the docking process. In order to wrap the sunken part, in this embodiment, the width of the annular pressing plate 41 is not less than 30% of the pipe diameter. Of course, if the sunken part is relatively long, multiple annular pressing plates 41 can be installed in parallel.

[0037] In order to be able to push out the sunken part, the hardness of the correction ball 5 is greater than that of the metal pipe. In this embodiment, the correction ball 5 is made of T8 tool steel. Since other components also need to bear a large force during use, the ejector rod is made of T7 tool steel, the fixing plate 21, the correction ball top plate 32, and the shaping assembly are made of 45# high-quality carbon steel and are quenched and tempered. Among the fasteners, the bolts are of strength grade 8.8, and the gaskets are of strength grade 8. In addition, the wall thickness of the annular pressing plate 41 is 1.5 - 3 times that of the metal pipe wall. If necessary, a strengthening structure can also be welded on the side of the annular pressing plate 41 away from the metal pipe.

[0038] In Embodiment 1 of the metal pipe dent correction method (hereinafter referred to as the correction method) of the present invention:

[0039] In this embodiment, the correction method adopts the mechanical structure in the above correction device. Therefore, the description of the mechanical structure part will not be repeated in this embodiment, and this correction method will only be described from the operation aspect.

[0040] First, before correction, it is necessary to clean the inner wall of the metal pipe at the place to be corrected, apply grease, insert the correction ball into the metal pipe, assemble the above-mentioned pushing mechanism, and then install the pushing mechanism on the end flange of the metal pipe through the first fastening bolt. The number of correction balls can be determined according to actual needs. If the sunken part is close to the end flange and the metal pipe is a straight pipe, one correction ball can be inserted. If the metal pipe is a bent pipe and the sunken part is located at a section far from the end flange, at least two correction balls should be inserted into the metal pipe so that the diameters of multiple correction balls are greater than the length from the turning point to the sunken part. Of course, if the metal pipe is a straight pipe but the sunken part in the metal pipe is far from the end flange and the ejector rod cannot reach directly, multiple correction balls can also be inserted so that the frontmost correction ball can reach the sunken part. Since the dimensions of both ends of the ejector rod in this embodiment are larger than the size of the pushing threaded hole, it is necessary to first assemble the pushing mechanism and then install it on the metal pipe.

[0041] After that, install the shaping mechanism at the sunken part of the metal pipe so that the annular pressing plate covers the sunken part of the metal pipe. Specifically, in order to achieve a better shaping effect, keep the sunken part in the middle of the annular pressing plate. Then tighten the second fastening bolt until the shaping component does not slide after releasing the hand. Of course, the installation order of the pushing mechanism and the shaping mechanism can also be changed. Since these are all preparatory work before correction, they can be adjusted according to requirements.

[0042] When both the shaping mechanism and the pushing mechanism are installed in place, the correction of the metal pipe can be carried out. Specifically, it is necessary to turn the ejector rod so that the ejector rod rotates relative to the fixed plate. During the turning process, especially when passing through the sunken part, a relatively large force is required, and relevant tools need to be used. In this embodiment, an electric tool with a speed regulation function is used. In the initial stage, since the correction ball has not reached the sunken part at this time, start the high-speed gear. At this time, the ejector rod can be extended relatively quickly, which is convenient to reach the position that needs to be repaired as soon as possible. After that, when the resistance during rotation increases significantly, adjust the electric tool to the low-speed gear and continue to screw the ejector rod into the fixed plate until the correction ball passes through the sunken part of the metal pipe.

[0043] Finally, after completing the correction of the metal pipe, disassemble the shaping mechanism and the pushing mechanism, and take out the correction ball to complete the correction of the metal pipe.

[0044] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

Claims

1. A device for correcting the indentation of a metal tube, characterized in that: It includes a fixing plate for fixedly installing on the end flange of a metal pipe. A threaded pushing hole is formed on the fixing plate. After the fixing plate is installed on the end flange, the axis of the threaded pushing hole is collinear with the axis of the metal pipe. The correction device further includes a push rod for threadedly assembling in the threaded pushing hole and a correction ball for placing inside the metal pipe. When in use, the push rod passes through the fixing plate. One end of the push rod located outside the metal pipe is a force application end for personnel to operate, and one end of the push rod located inside the metal pipe is used to abut against the correction ball and push the correction ball to slide over the sunken part of the metal pipe under the action of the threaded pushing hole to push out the sunken part of the metal pipe. The hardness of the correction ball is greater than that of the metal pipe.

2. The metal tube indentation correction device according to claim 1, characterized in that: The push rod includes a push rod body and a correction ball top plate installed at the end of the push rod for abutting against the correction ball. A limiting spherical surface matching the correction ball is provided on the correction ball top plate.

3. The metal pipe indentation correction device according to claim 2, wherein: A stepped hole is provided at the axis of the correction ball top plate. A threaded mounting hole corresponding to the stepped hole is provided on the push rod body to install the correction ball top plate at the end of the push rod through a mounting screw. The depth of the large-diameter section of the stepped hole is greater than the height of the screw head of the mounting screw.

4. The metal tube indentation correction device according to any one of claims 1-3, characterized in that: The correction device further includes an annular pressing plate which is separately arranged and hoop-mounted on the outer peripheral surface of the sunken part of the metal pipe through a fastener. There are at least two annular pressing plates, and a plurality of annular pressing plates are arranged along the outer peripheral surface of the metal pipe.

5. The metal tube indentation correction device according to claim 4, characterized in that: The inner diameter dimension of the circle where the annular pressing plate is located is 0.2 - 0.5 mm larger than the outer diameter dimension of the metal pipe.

6. The metal tube indentation correction device according to any one of claims 1-3, characterized in that: The diameter dimension of the correction ball is 0.1 - 0.2 mm smaller than the inner diameter dimension of the metal pipe.

7. A method for correcting the indentation of a metal tube, characterized in that: At least one correction ball is inserted into the metal pipe, and a pushing mechanism capable of pushing the correction ball is fixedly installed on the end flange of the metal pipe. The pushing mechanism includes a fixing plate and a push rod in threaded cooperation to push the correction ball through the sunken part of the metal pipe by rotating the push rod.

8. The method for correcting the indentation of a metal tube according to claim 7, characterized in that: When the metal pipe is a bent pipe and the sunken part is located at a section far from the end flange, at least two correction balls are inserted into the metal pipe so that the diameters of the plurality of correction balls are greater than the length from the turning point to the sunken part.

9. The method for correcting the indentation of a metal tube according to claim 7 or 8, characterized in that: Use an electric tool with gears to rotate the push rod. Use the high-speed gear of the electric tool before the push rod pushes the correction ball to reach the sunken part, and use the low-speed gear of the electric tool after the correction ball contacts the sunken part.

10. The method for correcting the indentation of a metal tube according to claim 7 or 8, characterized in that: Before correction, install an annular pressing plate on the outside of the sunken part of the metal pipe.

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