Device and method for correcting ellipse of pipe end of large-diameter steel pipe

Abstract

The invention relates to a device and method for correcting the ellipse of the pipe end of a large-diameter steel pipe, and relates to the technical field of construction auxiliary equipment, the device comprises a correcting mechanism, the correcting mechanism comprises a jack and two sets of supporting rods, the two sets of supporting rods are arranged at the fixed end and the telescopic end of the jack respectively and used for abutting against the inner wall of the steel pipe, and a containing cavity is formed in the jack; the containing cavity is divided into a rod cavity and a rodless cavity through the end of a piston rod of the jack, an inner oil way communicating with the rod cavity and the rodless cavity is further arranged in the jack, and the inner oil way can be selectively opened. And the hydraulic pump communicates with the rod cavity through a first oil way and communicates with the rodless cavity through a second oil way, and the first oil way can be selectively opened. Due to the fact that oil in the rod cavity is pressed to flow to the rodless cavity through the opened inner oil way, the oil does not need to pass through a first oil way and a second oil way, rapid jacking can be achieved, and the problems that in the prior art, the output flow of a manual hydraulic pump is small, the jacking speed is low, the roundness correction efficiency of the jack is affected, and the calibration speed is slowed down can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction auxiliary equipment, and particularly relates to a device and method for correcting the ovality of the end of a large-diameter steel pipe. Background Art

[0002] The ovality of the end of a steel pipe refers to the difference between the major axis and the minor axis of the pipe orifice. In order to facilitate butt welding at the construction site, the ovality of the steel pipe needs to be controlled within a certain range. After the steel pipe leaves the factory, due to collisions, squeezes, etc. during transportation, the ovality of the pipe end exceeds the standard. In order not to affect the subsequent butt joint of the steel pipe, it is necessary to send people to the site to correct the ovality.

[0003] In the prior art, such as a large pipeline oval internal adjustment tooling with the patent number CN217665546U, which includes a correction plate. A support sleeve is arranged at the bottom of the correction plate, a support rod is arranged at the bottom of the support sleeve, and arranged circular holes are respectively opened at the corresponding positions on the outer sides of the support sleeve and the support rod. Fixing pins can be arranged inside the arranged circular holes. A sleeve is arranged at the bottom of the support rod, and a jack is arranged below the sleeve. The utility model realizes the local oval correction of a large round pipe through the sleeve, the support sleeve, the support rod, the correction plate, the fixing pin, the baffle plate, and the jack. The relative positions of the support rod and the support sleeve can be adjusted to adapt to the local correction of large round pipes with different diameters, realizing the correction of local oval deformation of large round pipes, reducing the misalignment amount of the round pipe group, reducing the construction cost, and improving the qualification rate of the installation quality of the large round pipe group on site.

[0004] However, the relative positions of the support rod and the support sleeve are adjusted by the jacking of the jack. The adjustment speed is related to the jacking speed of the jack. The output flow of the manual hydraulic pump is small, and the jacking speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed. Summary of the Invention

[0005] The present application provides a device and method for correcting the ovality of the end of a large-diameter steel pipe, which can solve the problem in the prior art that the relative positions of the support rod and the support sleeve are adjusted by the jacking of the jack, the adjustment speed is related to the jacking speed of the jack, the output flow of the manual hydraulic pump is small, the jacking speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed.

[0006] In a first aspect, an embodiment of the present application provides a device for correcting the ovality of the end of a large-diameter steel pipe, which includes:

[0007] A calibration mechanism, which includes a jack and two groups of support rods. The two groups of support rods are respectively arranged at the fixed end and the telescopic end of the jack and are used for abutting against the inner wall of the steel pipe. An accommodation cavity is arranged inside the jack. The accommodation cavity is divided into a rod chamber and a rodless chamber by the end of the piston rod of the jack. An internal oil circuit communicating the rod chamber and the rodless chamber is also arranged inside the jack, and the internal oil circuit can be selectively opened;

[0008] A hydraulic pump is connected to the rod chamber through a first oil passage and to the rodless chamber through a second oil passage, and the first oil passage can be selectively opened.

[0009] In one embodiment, the inner oil passage is arranged inside the piston rod, and a check valve is arranged in the inner oil passage. The check valve is configured to open after receiving a set pressure transmitted from the rod chamber and deliver the oil in the rod chamber to the rodless chamber.

[0010] In one embodiment, the piston rod includes a partition section and a jacking section. The partition section is used to separate the rod chamber and the rodless chamber. The jacking section is connected to a support rod. The partition section cooperates with the bottom of the accommodating chamber to form the rodless chamber, and the partition section cooperates with the accommodating chamber and the jacking section to form the rod chamber wound around the outer periphery of the jacking section.

[0011] In one embodiment, the inner oil passage is arranged in an L shape. The straight section of the inner oil passage is arranged radially along the jacking section, and the vertical section is arranged axially along the piston rod. The check valve is arranged in the vertical section.

[0012] In one embodiment, a movable handle is provided in the middle of the jack. The movable handle is rotatably connected to the jack, and the rotation point of the movable handle and the jack is used to be arranged at the center of the steel pipe.

[0013] In one embodiment, a hoist is further included. The fixed end of the hoist is fixed in spatial position, and the hanging end of the hoist is connected to the side of the movable handle away from the jack.

[0014] In one embodiment, a pipe orifice clamp is further included. The pipe orifice clamp is used to be fixed on the wall of the steel pipe, and the pipe orifice clamp is connected to the fixed end of the hoist.

[0015] In one embodiment, a hanging screw is provided on the side of the pipe orifice clamp facing the inside of the steel pipe, and the fixed end of the hoist is hung on the hanging screw.

[0016] In one embodiment, the hydraulic pump includes:

[0017] A liquid storage box, which is connected to the rod chamber through the first oil passage and to the rodless chamber through the second oil passage;

[0018] A switching handle, which is arranged on the liquid storage box and is used to switch the output of oil by the first oil passage or the second oil passage;

[0019] A pressure rod, which is arranged on the liquid storage box and is used to drive the output of oil.

[0020] In a second aspect, an embodiment of the present application further provides a method for correcting the ovality of the end of a large-diameter steel pipe, which is implemented by using the above-described device for correcting the ovality of the end of a large-diameter steel pipe, and includes:

[0021] During the initial jacking, the first oil circuit is closed, and the hydraulic pump outputs oil through the second oil circuit. The piston rod extends, the volume of the rodless cavity expands, and the volume of the rod cavity decreases. At this time, the internal oil circuit is opened, and the oil in the rod cavity is pressurized and flows through the opened internal oil circuit to the rodless cavity.

[0022] When the support rod abuts against the inner wall of the steel pipe, the first oil circuit is opened, and the hydraulic pump outputs oil through the second oil circuit. The oil in the rod cavity flows back to the hydraulic pump through the first oil circuit.

[0023] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0024] When manufacturing the device for correcting the ovality of the end of a large-diameter steel pipe, two groups of support rods are respectively arranged at the fixed end and the telescopic end of the jack and are used to abut against the inner wall of the steel pipe. There is an accommodation cavity in the jack. The accommodation cavity is divided into a rod cavity and a rodless cavity by the end of the piston rod of the jack. An internal oil circuit connecting the rod cavity and the rodless cavity is also provided in the jack. The internal oil circuit can be selectively opened. The hydraulic pump is connected to the rod cavity through the first oil circuit and to the rodless cavity through the second oil circuit. The first oil circuit can be selectively opened. During the initial jacking, the first oil circuit is closed, and the hydraulic pump outputs oil through the second oil circuit. The piston rod extends, the volume of the rodless cavity expands, and the volume of the rod cavity decreases. At this time, the internal oil circuit is opened, and the oil in the rod cavity is pressurized and flows through the opened internal oil circuit to the rodless cavity. When the support rod abuts against the inner wall of the steel pipe, the first oil circuit is opened, and the hydraulic pump outputs oil through the second oil circuit. The oil in the rod cavity flows back to the hydraulic pump through the first oil circuit. After the calibration is completed, the hydraulic pump outputs oil through the first oil circuit, the piston rod retracts, the volume of the rod cavity expands, and the volume of the rodless cavity decreases. The oil in the rodless cavity flows back to the hydraulic pump through the second oil circuit. Since the oil in the rod cavity is pressurized and flows through the opened internal oil circuit to the rodless cavity without passing through the first oil circuit and the second oil circuit, rapid jacking can be achieved, and it can solve the problem in the prior art that the relative position between the support rod and the support sleeve is adjusted by the jacking of the jack, the adjustment speed is related to the jacking speed of the jack, the output flow of the manual hydraulic pump is small, the jacking speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 This is a schematic structural diagram of an embodiment of a device for correcting the ovality of the end of a large-diameter steel pipe according to the present invention.

[0027] Figure 2 This is a schematic structural diagram of a jack in an embodiment of a device for correcting the ovality of the end of a large-diameter steel pipe according to the present invention.

[0028] In the figure: 1. Jack; 11. Rod chamber; 12. Rodless chamber; 13. Internal oil circuit; 14. Piston rod; 141. Partition section; 142. Lifting part; 15. Check valve; 2. Support rod; 3. Steel pipe; 4. Hydraulic pump; 41. Liquid storage box; 42. Switching handle; 43. Pressing rod; 5. First oil circuit; 51. Control valve; 6. Second oil circuit; 7. Movable handle; 8. Hoist; 81. Lifting chain block; 9. Pipe mouth clamp; 91. Hanging screw. Specific embodiments

[0029] In order to enable those skilled in the art of this technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

[0030] The embodiments of this application provide a device and method for correcting the ovality of the end of a large-diameter steel pipe, which can solve the problem in the prior art that the relative position of the support rod and the support sleeve is adjusted by the lifting of the jack, the adjustment speed is related to the lifting speed of the jack, the output flow of the manual hydraulic pump is small, the lifting speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed.

[0031] As Figure 1 and Figure 2 shown, on the one hand, this application provides a device for correcting the ovality of the end of a large-diameter steel pipe, which includes:

[0032] A calibration mechanism, which includes a jack 1 and two groups of support rods 2. The two groups of support rods 2 are respectively arranged at the fixed end and the telescopic end of the jack 1 and are used to abut against the inner wall of the steel pipe 3. An accommodation cavity is provided in the jack 1, and the accommodation cavity is divided into a rod chamber 11 and a rodless chamber 12 by the end of the piston rod 14 of the jack 1. An internal oil circuit 13 communicating the rod chamber 11 and the rodless chamber 12 is also provided in the jack 1, and the internal oil circuit 13 can be selectively opened;

[0033] A hydraulic pump 4, which is communicated with the rod chamber 11 through a first oil circuit 5 and is communicated with the rodless chamber 12 through a second oil circuit 6, and the first oil circuit 5 can be selectively opened.

[0034] When manufacturing the device for circularity correction of the ends of large-diameter steel pipes, two groups of support rods 2 are respectively arranged at the fixed end and the telescopic end of the jack 1 and are used to abut against the inner wall of the steel pipe 3. The jack 1 is provided with an accommodation cavity, and the accommodation cavity is divided into a rod chamber 11 and a rodless chamber 12 by the end of the piston rod 14 of the jack 1. The jack 1 is also provided with an internal oil passage 13 communicating the rod chamber 11 and the rodless chamber 12, and the internal oil passage 13 can be selectively opened. The hydraulic pump 4 is communicated with the rod chamber 11 through a first oil passage 5 and is communicated with the rodless chamber 12 through a second oil passage 6, and the first oil passage 5 can be selectively opened. During the initial jacking, the first oil passage 5 is closed, and the hydraulic pump 4 outputs oil through the second oil passage 6. The piston rod 14 extends, the volume of the rodless chamber 12 expands, and the volume of the rod chamber 11 decreases. At this time, the internal oil passage 13 is opened, and the oil in the rod chamber 11 is pressurized and flows to the rodless chamber 12 through the opened internal oil passage 13. When the support rod 2 abuts against the inner wall of the steel pipe 3, the first oil passage 5 is opened, and the hydraulic pump 4 outputs oil through the second oil passage 6. The oil in the rod chamber 11 flows back to the hydraulic pump 4 through the first oil passage 5. After the calibration is completed, the hydraulic pump 4 outputs oil through the first oil passage 5, the piston rod 14 retracts, the volume of the rod chamber 11 expands, the volume of the rodless chamber 12 decreases, and the oil in the rodless chamber 12 flows back to the hydraulic pump 4 through the second oil passage 6. Since the oil in the rod chamber 11 is pressurized and flows to the rodless chamber 12 through the opened internal oil passage 13 without passing through the first oil passage 5 and the second oil passage 6, it can be jacked up quickly, and it can solve the problem in the prior art that the relative positions of the support rod and the support sleeve are adjusted by the jacking of the jack, the adjustment speed is related to the jacking speed of the jack, the output flow of the manual hydraulic pump is small, the jacking speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed.

[0035] In this example, a control valve 51 is provided on the first oil passage 5 to facilitate opening and closing the first oil passage 5.

[0036] As Figure 2 shown, in some alternative embodiments, the internal oil passage 13 is arranged inside the piston rod 14, and a check valve 15 is arranged inside the internal oil passage 13. The check valve 15 is configured to open after receiving a set pressure transmitted from the rod chamber 11 and deliver the oil in the rod chamber 11 to the rodless chamber 12.

[0037] In this embodiment, the internal oil passage 13 is arranged inside the piston rod 14, and a check valve 15 is arranged inside the internal oil passage 13. The check valve 15 is configured to open after receiving a set pressure transmitted from the rod chamber 11 and deliver the oil in the rod chamber 11 to the rodless chamber 12. Since the volume of the rod chamber 11 decreases, the oil in the rod chamber 11 presses against the check valve 15, and the check valve 15 opens after receiving the set pressure, and the oil in the rod chamber 11 flows unidirectionally to the rodless chamber 12, with a simple structure and convenient arrangement.

[0038] In this example, a controllable valve similar to the control valve 51 on the first oil passage 5 may also be provided on the internal oil passage 13, and the controllable valve is opened when the control valve 51 on the first oil passage 5 is closed.

[0039] As Figure 2 shown, in some alternative embodiments, the piston rod 14 includes a partition section 141 and a jacking section 142. The partition section 141 is used to partition the rod chamber 11 and the rodless chamber 12. The jacking section 142 is connected to the support rod 2. The partition section 141 cooperates with the bottom of the accommodating cavity to form the rodless chamber 12, and the partition section 141 cooperates with the accommodating cavity and the jacking section 142 to form the rod chamber 11 wound around the outer periphery of the jacking section 142.

[0040] In this embodiment, the structure of the piston rod 14 is specifically described. The piston rod 14 includes a partition section 141 and a jacking section 142. The partition section 141 is used to partition the rod chamber 11 and the rodless chamber 12. The jacking section 142 is connected to the support rod 2. The partition section 141 cooperates with the bottom of the accommodating cavity to form the rodless chamber 12, and the partition section 141 cooperates with the accommodating cavity and the jacking section 142 to form the rod chamber 11 wound around the outer periphery of the jacking section 142. The structure is simple and convenient for manufacturing.

[0041] As Figure 2 shown, in some alternative embodiments, the internal oil passage 13 is arranged in an L shape. The straight section of the internal oil passage 13 is arranged radially along the jacking section 142, and the vertical section is arranged axially along the piston rod 14. The one-way valve 15 is arranged in the vertical section.

[0042] In this embodiment, the internal oil passage 13 is arranged in an L shape. The straight section of the internal oil passage 13 is arranged radially along the jacking section 142, and the vertical section is arranged axially along the piston rod 14. The one-way valve 15 is arranged in the vertical section. The structure is simple and convenient for realizing the rapid jacking of the jack 1.

[0043] As Figure 1 shown, in some alternative embodiments, a movable handle 7 is provided in the middle of the jack 1. The movable handle 7 is rotatably connected to the jack 1, and the rotation point of the movable handle 7 and the jack 1 is used to be arranged at the center of the steel pipe 3.

[0044] In this embodiment, a movable handle 7 is provided in the middle of the jack 1. The movable handle 7 is rotatably connected to the jack 1, and the rotation point of the movable handle 7 and the jack 1 is used to be arranged at the center of the steel pipe 3. After being lifted, the calibration mechanism can rotate freely, and can perform roundness calibration on different directions of the pipe end, which is convenient for use.

[0045] As Figure 1 shown, in some alternative embodiments, a hoist 8 is further included. The fixed end of the hoist 8 is fixed in spatial position, and the suspension end of the hoist 8 is connected to the side of the movable handle 7 away from the jack 1.

[0046] In this embodiment, the device for correcting the ovality of the end of a large-diameter steel pipe further includes a hoist 8. The spatial position of the fixed end of the hoist 8 is fixed, and the hanging end of the hoist 8 is connected to the side of the movable handle 7 away from the jack 1, facilitating the lifting of the calibration mechanism.

[0047] As Figure 1 shown, in some alternative embodiments, it further includes a pipe mouth clamp 9. The pipe mouth clamp 9 is used to be fixed on the pipe wall of the steel pipe 3, and the pipe mouth clamp 9 is connected to the fixed end of the hoist 8.

[0048] In this embodiment, the device for correcting the ovality of the end of a large-diameter steel pipe further includes a pipe mouth clamp 9. The pipe mouth clamp 9 is used to be fixed on the pipe wall of the steel pipe 3, and the pipe mouth clamp 9 is connected to the fixed end of the hoist 8, facilitating the installation of the hoist 8.

[0049] In this example, the hoist 8 is provided with a lifting chain block 81, facilitating the hoisting of the calibration mechanism.

[0050] As Figure 1 shown, in some alternative embodiments, on the side of the pipe mouth clamp 9 facing the inside of the steel pipe 3, there is a hanging screw 91, and the fixed end of the hoist 8 is hung on the hanging screw 91.

[0051] In this embodiment, on the side of the pipe mouth clamp 9 facing the inside of the steel pipe 3, there is a hanging screw 91, and the fixed end of the hoist 8 is hung on the hanging screw 91, facilitating the adjustment of the orientation of the hoist 8 according to requirements and facilitating the process of installing the calibration mechanism.

[0052] As Figure 1 and Figure 2 shown, in some alternative embodiments, the hydraulic pump 4 includes:

[0053] A liquid storage box 41, which is communicated with the rod chamber 11 through a first oil circuit 5 and is communicated with the rodless chamber 12 through a second oil circuit 6;

[0054] A switching handle 42, which is arranged on the liquid storage box 41 and is used to switch the output of the first oil circuit 5 or the second oil circuit 6;

[0055] A pressure rod 43, which is arranged on the liquid storage box 41 and is used to drive the output of the oil.

[0056] In this embodiment, the structure of the hydraulic pump 4 is specifically described. The hydraulic pump 4 includes a liquid storage box 41, a switching handle 42, and a pressure rod 43. Among them, the liquid storage box 41 is communicated with the rod chamber 11 through a first oil circuit 5 and is communicated with the rodless chamber 12 through a second oil circuit 6. The switching handle 42 is arranged on the liquid storage box 41 and is used to switch the output of the first oil circuit 5 or the second oil circuit 6. The pressure rod 43 is arranged on the liquid storage box 41 and is used to drive the output of the oil. The structure is simple and convenient for switching the output pipeline.

[0057] As Figure 1 and Figure 2 shown, on the other hand, the present application also provides a method for correcting the ovality of the end of a large-diameter steel pipe, which is implemented by using the above-mentioned device for correcting the ovality of the end of a large-diameter steel pipe, and includes:

[0058] During the initial jacking, the first oil circuit 5 is closed, the hydraulic pump 4 outputs oil through the second oil circuit 6, the piston rod 14 extends, the volume of the rodless cavity 12 expands, and the volume of the rod cavity 11 decreases. At this time, the internal oil circuit 13 is opened, and the oil in the rod cavity 11 is pressurized and flows through the opened internal oil circuit 13 to the rodless cavity 12;

[0059] When the support rod 2 abuts against the inner wall of the steel pipe 3, the first oil circuit 5 is opened, the hydraulic pump 4 outputs oil through the second oil circuit 6, and the oil in the rod cavity 11 flows back to the hydraulic pump 4 through the first oil circuit 5.

[0060] When manufacturing the device for correcting the ovality of the end of a large-diameter steel pipe, two groups of support rods 2 are respectively arranged at the fixed end and the telescopic end of the jack 1 and are used to abut against the inner wall of the steel pipe 3. An accommodation cavity is provided in the jack 1, and the accommodation cavity is divided into a rod cavity 11 and a rodless cavity 12 by the end of the piston rod 14 of the jack 1. An internal oil circuit 13 connecting the rod cavity 11 and the rodless cavity 12 is also provided in the jack 1. The internal oil circuit 13 can be selectively opened. The hydraulic pump 4 is connected to the rod cavity 11 through the first oil circuit 5 and is connected to the rodless cavity 12 through the second oil circuit 6. The first oil circuit 5 can be selectively opened. During the initial jacking, the first oil circuit 5 is closed, the hydraulic pump 4 outputs oil through the second oil circuit 6, the piston rod 14 extends, the volume of the rodless cavity 12 expands, and the volume of the rod cavity 11 decreases. At this time, the internal oil circuit 13 is opened, and the oil in the rod cavity 11 is pressurized and flows through the opened internal oil circuit 13 to the rodless cavity 12. When the support rod 2 abuts against the inner wall of the steel pipe 3, the first oil circuit 5 is opened, the hydraulic pump 4 outputs oil through the second oil circuit 6, and the oil in the rod cavity 11 flows back to the hydraulic pump 4 through the first oil circuit 5. After the calibration is completed, the hydraulic pump 4 outputs oil through the first oil circuit 5, the piston rod 14 retracts, the volume of the rod cavity 11 expands, and the volume of the rodless cavity 12 decreases. The oil in the rodless cavity 12 flows back to the hydraulic pump 4 through the second oil circuit 6. Since the oil in the rod cavity 11 is pressurized and flows through the opened internal oil circuit 13 to the rodless cavity 12 without passing through the first oil circuit 5 and the second oil circuit 6, it can be jacked up quickly, and it can solve the problem in the prior art that the relative position of the support rod and the support sleeve is adjusted by the jacking of the jack, the adjustment speed is related to the jacking speed of the jack, the output flow of the manual hydraulic pump is small, the jacking speed is slow, which affects the roundness correction efficiency of the jack and slows down the calibration speed.

[0061] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0062] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of another identical element in the process, method, article or device including the said element.

[0063] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for elliptical correction of large-diameter steel pipe ends, characterized in that: include: A calibration mechanism, comprising a jack (1) and two groups of support rods (2), wherein the two groups of support rods (2) are respectively arranged at the fixed end and the telescopic end of the jack (1) and are used to abut against the inner wall of a steel pipe (3), wherein the jack (1) is provided with a receiving chamber, wherein the receiving chamber is divided into a rod chamber (11) and a rodless chamber (12) by the end of a piston rod (14) of the jack (1), and the jack (1) is also provided with an internal oil circuit (13) connecting the rod chamber (11) and the rodless chamber (12), wherein the internal oil circuit (13) can be selectively opened; A hydraulic pump (4) is connected to the rod chamber (11) through a first oil circuit (5) and is connected to the rodless chamber (12) through a second oil circuit (6); the first oil circuit (5) can be selectively opened.

2. A device for elliptical correction of large-diameter steel pipe ends as claimed in claim 1, characterized in that: The internal oil circuit (13) is arranged in the piston rod (14), and a one-way valve (15) is arranged in the internal oil circuit (13). The one-way valve (15) is configured to open after receiving a set pressure transmitted by the rod chamber (11) to transport the oil in the rod chamber (11) to the rodless chamber (12).

3. A device for elliptical correction of large-diameter steel pipe ends as claimed in claim 2, characterized in that: The piston rod (14) includes a partition section (141) and a lifting portion (142), wherein the partition section (141) is used to separate the rod chamber (11) and the rodless chamber (12), and the lifting portion (142) is connected to the support rod (2), and the partition section (141) cooperates with the bottom of the accommodating chamber to form the rodless chamber (12), and the partition section (141) cooperates with the accommodating chamber and the lifting portion (142) to form the rod chamber (11) arranged around the outer periphery of the lifting portion (142).

4. A device for elliptical correction of large-diameter steel pipe ends as claimed in claim 3, characterized in that: The internal oil circuit (13) is arranged in an L shape, the straight section of the internal oil circuit (13) is arranged radially along the lifting portion (142), the vertical section is arranged axially along the piston rod (14), and the one-way valve (15) is arranged in the vertical section.

5. The device for elliptical correction of large-diameter steel pipe ends as claimed in claim 1, characterized in that: A movable handle (7) is provided in the middle of the jack (1), and the movable handle (7) is rotatably connected to the jack (1). The rotation point of the movable handle (7) and the jack (1) is arranged at the center of the steel pipe (3).

6. A device for ovality correction of large diameter steel pipe ends as claimed in claim 5, characterized in that: It also comprises a hoist (8), the fixed end of which is fixed in spatial position, and the hanging end of which is connected to a side of the movable handle (7) away from the jack (1).

7. A device for ovality correction of large diameter steel pipe ends as claimed in claim 6, characterized in that: It also includes a pipe mouth clamp (9), which is used to be fixed on the pipe wall of the steel pipe (3), and the pipe mouth clamp (9) is connected to the fixed end of the hoist (8).

8. The device for ovality correction of large diameter steel pipe ends as claimed in claim 7, characterized in that: A hanging screw (91) is provided on the side of the pipe mouth clamp (9) facing the inside of the steel pipe (3), and the fixed end of the hanging hoist (8) is suspended on the hanging screw (91).

9. The device for elliptical correction of large diameter steel pipe ends as claimed in claim 1, characterized in that: The hydraulic pump (4) comprises: A liquid storage box (41), which is in communication with the rod chamber (11) through the first oil passage (5) and in communication with the rodless chamber (12) through the second oil passage (6); A switching handle (42), which is arranged on the liquid storage box (41) and is used to switch the first oil circuit (5) or the second oil circuit (6) to output oil; A pressure rod (43) is arranged on the liquid storage box (41) and is used to drive the oil to be output.

10. A method for ovality correction of large diameter steel pipe ends, characterized in that: The method is implemented by using a device for ellipsoidal correction of large-diameter steel pipe ends as described in any one of claims 1 to 9, comprising: During the initial lifting, the first oil circuit (5) is closed, the hydraulic pump (4) outputs oil through the second oil circuit (6), the piston rod (14) extends, the volume of the rodless chamber (12) expands, and the volume of the rod chamber (11) decreases. At this time, the internal oil circuit (13) is opened, and the oil in the rod chamber (11) is pressurized and flows to the rodless chamber (12) through the opened internal oil circuit (13); When the support rod (2) abuts against the inner wall of the steel pipe (3), the first oil circuit (5) is opened, the hydraulic pump (4) outputs oil through the second oil circuit (6), and the oil in the rod chamber (11) flows back to the hydraulic pump (4) through the first oil circuit (5).

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