Jacking and tensioning device

Abstract

The invention relates to the technical field of pipeline expansion, in particular to a jacking and tensioning device which comprises a clamping mechanism and a radial expansion mechanism. The clamping mechanism is used for clamping a to-be-expanded pipeline; the radial expansion mechanism comprises a linear driver and expansion pieces, the linear driver is used for entering or exiting from the to-be-expanded pipeline in the axial direction, and the expansion pieces are connected with the linear driver, circumferentially arranged on the outer side of the linear driver in the axial direction and capable of moving towards or away from the linear driver so as to adjust the inner diameter of the to-be-expanded pipeline. When the inner diameter of the to-be-expanded pipeline needs to be expanded, the expansion piece can move away from the linear driver and gradually abut against the inner wall of the to-be-expanded pipeline, so that uniform expansion is conducted, the inner diameter of the to-be-expanded pipeline can be slowly adjusted, the expansion precision is improved, and the expansion effect is good; when the inner diameter of the to-be-expanded pipeline does not need to be continuously expanded, the expansion piece can move towards the linear driver and gradually contract so as to be separated from the inner wall of the to-be-expanded pipeline, and the to-be-expanded pipeline can be prevented from being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline expansion, and in particular to a tensioning device. Background Art

[0002] Steam turbines have multiple key pipelines, such as the main steam pipeline and the main feedwater pipeline, which are hard pipelines. Hard pipelines need to be regularly inspected after long-term use. Since the diameter of the pipe mouth of the hard pipeline is fixed, some tools cannot enter the hard pipeline due to size restrictions. Existing expansion tools basically apply the expansion force directly to the side wall of the hard pipeline.

[0003] Currently, applying expansion forces directly to the sidewalls of rigid pipes results in uneven expansion of the rigid pipes. Summary of the invention

[0004] The invention provides a tensioning device, which is used to solve the problem that current tools directly apply expansion force to the side wall of a hard pipe, resulting in uneven expansion of the hard pipe.

[0005] In one aspect, the present invention provides a tensioning device, comprising:

[0006] A clamping mechanism, used for clamping the pipe to be expanded;

[0007] The radial expansion mechanism includes a linear drive and an expansion piece. The linear drive is used to enter or exit the pipeline to be expanded along the axial direction. The expansion piece is connected to the linear drive and is arranged circumferentially around the axial direction on the outside of the linear drive. It can move toward or away from the linear drive to adjust the inner diameter of the pipeline to be expanded.

[0008] In some embodiments, it also includes:

[0009] The moving mechanism is connected with the radial expansion mechanism to drive the radial expansion mechanism to move toward or away from the clamping mechanism, or is connected with the clamping mechanism to drive the clamping mechanism to move toward or away from the radial expansion mechanism.

[0010] In some embodiments, it also includes:

[0011] The driving mechanism is connected to the radial expansion mechanism to drive the expansion member to move toward or away from the linear drive.

[0012] In some embodiments, the expansion member includes a plurality of arcuate plates, each arcuate plate is connected to the linear drive, and the plurality of arcuate plates are arranged in a circumferential array around the axial direction on the outer side of the linear drive.

[0013] In some embodiments, the linear actuator comprises:

[0014] The guide member is movable in the axial direction and is provided with a communicating accommodation cavity and a slide groove, wherein the slide groove is arranged in a circumferential array around the axial direction outside the accommodation cavity;

[0015] The movable part is adapted in the slide slot and connected to the expansion part; wherein,

[0016] The movable part, the slide groove and the accommodating cavity enclose a closed area. When the pressure value in the closed area is less than or equal to a preset threshold and the pressure value increases, the expansion part moves away from the linear drive.

[0017] In some embodiments, the clamping mechanism comprises:

[0018] A clamping portion, used to clamp the pipeline to be expanded along the axial direction;

[0019] The lifting part is connected to the clamping part to adjust the height of the pipeline to be expanded in the vertical direction along the axial direction.

[0020] In some embodiments, the moving mechanism comprises:

[0021] A plurality of telescopic parts, any two adjacent telescopic parts are connected, the telescopic parts are arranged along the axial direction, wherein a telescopic part located at the end is connected to the radial expansion mechanism, or a telescopic part located at the end is connected to the clamping mechanism.

[0022] In some embodiments, the driving mechanism comprises:

[0023] A connecting pipe is provided through the guide member and is connected to the closed area;

[0024] The driving member is connected to one end of the connecting tube away from the guiding member, and provides a driving force to the closed area through the connecting tube to drive the expansion member to move away from the guiding member.

[0025] In some of the embodiments, the guide member is provided with an avoidance groove, one end of which is connected to the accommodating cavity, and the other end of which passes through the surface of the guide member to accommodate the connecting pipe.

[0026] In some embodiments, the moving mechanism further comprises:

[0027] The carrier is movable along the axial direction, and the clamping mechanism and the telescopic member are installed on the carrier.

[0028] The beneficial effects of the present invention are as follows: the tensioning device of the present invention is provided with a clamping mechanism and a radial expansion mechanism, and the radial expansion mechanism includes a linear drive and an expansion piece. When the inner diameter of the pipeline to be expanded needs to be expanded, the expansion piece can move away from the linear drive and gradually press against the inner wall of the pipeline to be expanded, thereby performing uniform expansion, and the inner diameter of the pipeline to be expanded can be slowly adjusted, thereby improving the expansion accuracy and achieving a good expansion effect; when there is no need to continue to expand the inner diameter of the pipeline to be expanded, the expansion piece can move toward the linear drive and gradually shrink, thereby separating from the inner wall of the pipeline to be expanded, thereby avoiding damage to the pipeline to be expanded. Therefore, the tensioning device can avoid the occurrence of uneven expansion caused by the existing tools directly applying expansion force to the side wall of the hard pipe; at the same time, it can solve the problem that the side wall of the hard pipe is severely damaged when the expansion force is directly applied to the side wall of the hard pipe, resulting in difficulty in recovery; and it can solve the problem of damaging the soft pipe when the expansion force is directly applied to the side wall of the soft pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an overall schematic diagram of a top tensioning device in an embodiment of the present invention;

[0030] Figure 2 is a partial cross-sectional schematic diagram of a top tensioning device in an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the effect when the top expansion head assembly in the embodiment of the present invention is located outside the pipeline to be expanded;

[0032] Figure 4 It is a schematic diagram of the effect of the expansion piece in an embodiment of the present invention on the expansion of the pipeline to be expanded.

[0033] In the figure: 1, pipeline to be expanded; 2, inner wall; 100, clamping mechanism; 110, clamping part; 120, lifting part; 200, radial expansion mechanism; 210, linear drive; 211, guide member; 2111, accommodating chamber; 2112, slide groove; 2113, avoidance groove; 212, movable member; 220, expansion member; 221, arc plate; X, axial direction; R, radial direction; 300, moving mechanism; 310, telescopic member; 320, carrier; 400, driving mechanism; 410, connecting pipe; 420, driving member. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The applicant noted that the current steam turbine has multiple key pipelines, including: the main steam pipeline and the main feed water pipeline, which are hard pipelines. The pipeline needs to be regularly inspected after long-term use. Since the diameter of the pipeline mouth is fixed, some tools cannot enter the hard pipeline due to size restrictions. The existing expansion tools basically apply the expansion force directly to the side wall of the hard pipeline, resulting in greater damage to the side wall of the hard pipeline, and the expansion force on the side wall causes uneven expansion of the hard pipeline, which is too large to recover after expansion, or the expansion force is directly applied to the side wall of the soft pipeline, which will also cause damage to the soft pipeline.

[0036] The main steam pipeline of the current steam turbine is a high-temperature and high-pressure steam pipeline between the superheater outlet manifold and the high-pressure main steam valve interface, and the main feedwater pipeline is a high-pressure boiler feedwater pipeline between the electric feedwater pump outlet and the economizer inlet manifold interface. The steam turbine is an external combustion rotary machine that can convert steam thermal energy into mechanical work. After the steam from the boiler enters the steam turbine, it passes through a series of annularly configured nozzles and moving blades in turn, converting the thermal energy of the steam into mechanical energy for the rotation of the turbine rotor. Steam in the steam turbine undergoes energy conversion in different ways, forming steam turbines with different working principles. According to the thermodynamic characteristics, steam turbines include condensing steam turbines, heating steam turbines, back pressure steam turbines, extraction steam turbines and saturated steam turbines. Among them, the steam discharged from the condensing steam turbine flows into the condenser, and the exhaust pressure is lower than the atmospheric pressure, so it has good thermal performance and is the most commonly used steam turbine; the heating steam turbine not only provides power to drive the generator or other machinery, but also provides heat for production or life, and has a high thermal energy utilization rate; the exhaust pressure of the back-pressure steam turbine is a steam turbine greater than the atmospheric pressure; the extraction steam turbine is a steam turbine that can extract steam from the middle stage for heating; the saturated steam turbine is a steam turbine that uses saturated steam as new steam. The top tensioning device described in the present invention is applicable to any one of the above-mentioned condensing steam turbine, heating steam turbine, back-pressure steam turbine, extraction steam turbine and saturated steam turbine.

[0037] As described in the background art, directly applying an expansion force to the side wall of a rigid pipe may result in uneven expansion of the rigid pipe.

[0038] At the same time, it can solve the problem that when an expansion force is directly applied to the side wall of a hard pipe, the side wall of the hard pipe is severely damaged and difficult to recover; and it can solve the problem that when an expansion force is directly applied to the side wall of a soft pipe, the soft pipe is damaged.

[0039] To solve the above problems, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4The present invention provides a tensioning device, comprising a clamping mechanism 100 and a radial expansion mechanism 200. The clamping mechanism 100 is used to clamp the pipeline 1 to be expanded, wherein the pipeline 1 to be expanded has an inner wall 2. The radial expansion mechanism 200 comprises a linear driver 210 and an expansion member 220. The linear driver 210 is used to enter or exit the pipeline 1 to be expanded along the axial direction X. The expansion member 220 is connected to the linear driver 210 and is circumferentially arranged on the outside of the linear driver 210 around the axial direction X, and can move toward or away from the linear driver 210, that is, the expansion member 220 can expand or contract along the vertical direction of the axial direction X to adjust the inner diameter of the pipeline 1 to be expanded; wherein the vertical direction of the axial direction X is defined as the radial direction R of the linear driver 210.

[0040] When it is necessary to expand the inner diameter of the pipeline 1 to be expanded, the expansion piece 220 can move toward the side away from the linear drive 210. Specifically, the expansion piece 220 can move along the vertical direction of the axial direction X, that is, along the radial direction R of the linear drive 210 toward the side away from the linear drive 210, and gradually press against the inner wall 2 of the pipeline 1 to be expanded. The expansion piece 220 gradually expands along the radial direction R, so that the expansion piece 220 uniformly expands the inner diameter of the pipeline 1 to be expanded, and can slowly expand and adjust the inner diameter of the pipeline 1 to be expanded, thereby improving the expansion accuracy of the pipeline 1 to be expanded and achieving a good expansion effect.

[0041] When there is no need to continue expanding the inner diameter of the pipeline 1 to be expanded, the expansion piece 220 can move toward the linear drive 210. Specifically, the expansion piece 220 can move toward one side of the linear drive 210 along the perpendicular direction of the axial direction X, that is, along the radial direction R of the linear drive 210, which is equivalent to the expansion piece 220 gradually shrinking along the radial direction R, so that the expansion piece 220 is separated from the inner wall 2 of the pipeline 1 to be expanded, thereby avoiding damage to the pipeline 1 to be expanded.

[0042] Compared with the current tools, the tensioning device is provided with a clamping mechanism 100 and a radial expansion mechanism 200. The radial expansion mechanism 200 includes a linear drive 210 and an expansion piece 220. When the pipeline 1 to be expanded is a hard pipe, the inner wall 2 of the pipeline 1 to be expanded is the side wall of the hard pipe, which can avoid the occurrence of uneven expansion when the existing tools directly apply expansion force to the side wall of the hard pipe.

[0043] At the same time, when the pipeline 1 to be expanded is a hard pipe, since the expansion piece 220 is circumferentially arranged on the outside of the linear driver 210 around the axial direction X, when the inner diameter of the pipeline 1 to be expanded needs to be expanded, the expansion piece 220 can move away from the linear driver 210 to expand and adjust the inner diameter of the pipeline 1 to be expanded, so that the inner wall 2 of the pipeline 1 to be expanded will not be damaged due to the expansion of the pipeline 1 to be expanded, and the expansion of the pipeline 1 to be expanded will not be uneven. When there is no need to continue to expand the inner diameter of the pipeline 1 to be expanded, the expansion piece 220 can move toward the linear driver 210, and the position relationship of the expansion piece 220 against the inner wall 2 is converted to the position relationship of the expansion piece 220 detached from the inner wall 2, and the expansion piece 220 moves outward from the cavity enclosed by the pipeline 1 to be expanded along the axial direction X, and the expansion piece 220 can be safely withdrawn from the pipeline 1 to be expanded, and the side wall of the hard pipe will not be damaged greatly when the expansion force is directly applied to the side wall of the hard pipe, which makes it difficult to recover.

[0044] Furthermore, when the pipeline 1 to be expanded is a soft pipe, the current expansion tool applies the expansion force directly to the side wall of the soft pipe, which will directly cause damage to the soft pipe. For the tensioning device of the present invention, when it is necessary to expand the inner diameter of the pipe, since the expansion piece 220 is circumferentially arranged on the outside of the linear driver 210, the linear driver 210 drives the expansion piece 220 to move linearly along the axial direction X, and the linear driver 210 can drive the expansion piece 220 to move away from the linear driver 210 along the radial direction R, that is, the expansion piece 220 presses against the inner wall of the pipe along the radial direction R and performs an expansion movement, and the expansion piece 220 can evenly open the pipe in a mixed direction of the axial direction X and the radial direction R, thereby not directly damaging the pipe.

[0045] In some embodiments, such as Figure 1 As shown, the tensioning device also includes a moving mechanism 300, which is connected to the radial expansion mechanism 200 to drive the radial expansion mechanism 200 to move toward or away from the clamping mechanism 100; specifically, when it is necessary to expand the pipeline 1 to be expanded, in the direction of the axial direction X, the moving mechanism 300 drives the radial expansion mechanism 200 to move toward the clamping mechanism 100 and one side of the pipeline 1 to be expanded clamped by it; when there is no need to continue to expand the inner diameter of the pipeline 1 to be expanded and it is necessary to withdraw from the pipeline 1 to be expanded, the moving mechanism 300 drives the radial expansion mechanism 200 to move toward the side away from the clamping mechanism 100 and the pipeline 1 to be expanded.

[0046] Alternatively, in some other embodiments, the moving mechanism 300 is connected to the clamping mechanism 100 to drive the clamping mechanism 100 to move toward or away from the radial expansion mechanism 200; specifically, when it is necessary to expand the pipeline 1 to be expanded, in the direction along the axial direction X, the moving mechanism 300 drives the clamping mechanism 100 and the pipeline 1 to be expanded clamped therein to move toward one side of the radial expansion mechanism 200; when there is no need to continue to expand the inner diameter of the pipeline 1 to be expanded and it is necessary to withdraw the pipeline 1 to be expanded, the moving mechanism 300 drives the clamping mechanism 100 and the pipeline 1 to be expanded to move toward the side away from the radial expansion mechanism 200.

[0047] In some embodiments, such as Figure 1 As shown, the top tensioning device also includes a driving mechanism 400, which is connected to the radial expansion mechanism 200 to drive the expansion member 220 to move toward or away from the linear driver 210. Specifically, when it is necessary to expand the pipeline 1 to be expanded, the driving mechanism 400 is used to drive the expansion member 220 to move along the radial direction R toward the side away from the linear driver 210. When the expansion member 220 does not need to continue to expand the inner diameter of the pipeline 1 to be expanded and needs to withdraw from the pipeline 1 to be expanded, the driving mechanism 400 is used to drive the expansion member 220 to move along the radial direction R toward one side of the linear driver 210.

[0048] In some embodiments, such as Figure 2 to Figure 4 As shown, the expansion member 220 includes a plurality of arc plates 221, each arc plate 221 is connected to the linear drive 210, and the plurality of arc plates 221 are arranged in a circumferential array around the axial direction X on the outside of the linear drive 210. Preferably, the plurality of arc plates 221 are connected to the outer periphery of the linear drive 210 at uniform intervals around the axial direction X.

[0049] When it is necessary to expand the pipeline 1 to be expanded, the multiple arc plates 221 can move along the radial direction R toward the side away from the linear driver 210 and be in an expanded state, and the outer surfaces of the multiple arc plates 221 on the side away from the linear driver 210 press against the inner wall 2 of the pipeline 1 to be expanded to evenly expand the inner diameter of the pipeline 1 to be expanded, which can solve the problem of uneven expansion of the pipeline 1 to be expanded by the current expansion tool and damage to the inner wall 2 of the pipeline 1 to be expanded caused by the current expansion tool when expanding the pipeline 1 to be expanded.

[0050] Or, if Figure 2 and Figure 3As shown, when there is no need to continue to expand the pipeline 1 to be expanded, when the expansion member 220 has not started to expand the pipeline 1 to be expanded or when the expansion member 220 exits the pipeline 1 to be expanded, the multiple arc plates 221 can move toward the linear driver 210 along the radial direction R and be in a contracted state, and the outer surface of the multiple arc plates 221 on the side away from the linear driver 210 is separated from the inner wall 2 of the pipeline 1 to be expanded, so that the linear driver 210 drives the pipeline 1 to be expanded along the axial direction X away from the pipeline 1 to be expanded until it exits the pipeline 1 to be expanded, and the multiple arc plates 221 can be safely withdrawn from the pipeline 1 to be expanded, and there will be no phenomenon that the side wall of the hard pipe is severely damaged when the expansion force is directly applied to the side wall of the hard pipe, which makes it difficult to recover. Therefore, the expansion member 220 can generate a uniform expansion force on the inner wall 2 of the pipeline 1 to be expanded through the structural design and connection design of the multiple arc plates 221, and realize the uniform expansion of the inner diameter of the pipeline 1 to be expanded.

[0051] It should be noted that, in some embodiments, Figure 4 As shown, when the expansion member 220 is expanding the pipeline 1 to be expanded, any two adjacent arc plates 221 are separated from each other, and a plurality of arc plates 221 are evenly spaced and arranged around the axial direction X on the periphery of the linear driver 210. When the expansion member 220 is in a contracted state, any two adjacent arc plates 221 are connected to each other and connected to form a sleeve structure, and a surface of the sleeve structure formed by the connection facing the linear driver 210 fits with the outer peripheral surface of the linear driver 210.

[0052] In some other embodiments of the present invention, the expansion member 220 includes an annular plate (not shown), which is arranged in a ring around the axial direction X in the circumferential direction of the linear actuator 210, has the same radial cross section, and is an elastic body. In some embodiments, the annular plate is provided with one; or, in some other embodiments, multiple annular plates are stacked along the axial direction X, and the inner diameters of the multiple annular plates have the same cross section in the radial direction R of the linear actuator 210. Or, in some other embodiments, the annular plates are provided in multiples, and the multiple annular plates can be sleeved in sequence around the axial direction X. When the annular plate is located inside the pipeline 1 to be expanded, the surface of the side of the annular plate facing away from the linear actuator 210 is always in contact with the inner wall 2 of the pipeline 1 to be expanded, and when the inner wall 2 is gradually expanded by the annular plate, the elastic extrusion deformation of the annular plate is gradually increased; or when the expansion of the inner wall 2 by the annular plate is completed, even if the annular plate and the inner wall 2 are still in contact, the expansion of the inner wall 2 by the annular plate gradually disappears due to the gradual release of the elastic extrusion force of the annular plate.

[0053] In some embodiments, such as Figure 2As shown, the linear actuator 210 includes a guide member 211 and a movable member 212. The guide member 211 can move along the axial direction X, and the guide member 211 is used to enter or exit the pipeline 1 to be expanded along the axial direction X. The guide member 211 is provided with a connected accommodating cavity 2111 and a slide groove 2112, and the slide groove 2112 is arranged in a circumferential array around the axial direction X outside the accommodating cavity 2111; wherein, the guide member 211 can be connected to the moving mechanism 300. The movable member 212 is adapted in the slide groove 2112 and connected to the expansion member 220; wherein, the movable member 212, the slide groove 2112 and the accommodating cavity 2111 enclose a closed area (not numbered in the figure), and when the pressure value in the closed area is less than or equal to the preset threshold value and the pressure value increases, the expansion member 220 moves away from the linear actuator 210, that is, the expansion member 220 expands along the radial direction R to expand the inner diameter of the pipeline 1 to be expanded.

[0054] like Figure 2 As shown, the accommodating cavity 2111 is arranged inside the guide member 211, and the slide grooves 2112 are arranged in a circumferential array around the axial direction X outside the accommodating cavity 2111. The slide grooves 2112 are opened on the guide member 211, and one end of the slide grooves 2112 away from the accommodating cavity 2111 passes through the outer surface of the guide member 211.

[0055] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, there are multiple slide grooves 2112, and the multiple slide grooves 2112 are arranged on the guide member 211 at intervals around the axial direction X, and the multiple slide grooves 2112 are aligned and arranged along the radial direction R on the guide member 211; the movable parts 212 are provided in multiple groups, and the movable parts 212 and the slide grooves 2112 are arranged in a one-to-one correspondence; and when the expansion member 220 includes a plurality of arc plates 221, the movable parts 212 are connected between the arc plates 221 and the guide member 211, and the movable parts 212 and the arc plates 221 are arranged in a one-to-one correspondence, and the movable parts 212 and the slide grooves 2112 are arranged in a one-to-one correspondence. When there are multiple slide grooves 2112 and they are evenly spaced around the extension direction X of the guide member 211, the movable member 212 slides in the slide groove 2112 accordingly, and multiple groups of movable members 212 synchronously push the expansion member 220 to move, so that the expansion member 220 is evenly stressed, and the side surface of the expansion member 220 that is away from the movable member 212 is pressed against the inner wall 2 and balances the force applied to the expansion pipeline 1 when it is expanded.

[0056] In addition, in some specific embodiments, Figure 2 As shown, the slide groove 2112 is extended along the radial direction R, and multiple slide grooves 2112 are aligned and arranged along the radial direction R, which can simplify the structural design of the slide groove 2112 and achieve the uniform expansion requirement of the expansion piece 220 on the pipeline 1 to be expanded.

[0057] On the contrary, it should be noted that if the slide groove 2112 is set as one and the movable part 212 is set as a group, the movable part 212 can only stretch the expansion member 220 on one side, or if the slide groove 2112 and the movable part 212 that slides inside are unevenly arranged around the axial direction X in the guide member 211, especially when the movable part 212 pushes the expansion member 220 toward the side away from the guide member 211 to perform a tensioning effect on the inner wall 2 of the pipeline 1 to be expanded, it is easy to cause the local stress on the inner wall 2 to increase, thereby causing damage to the inner wall 2 of the pipeline 1 to be expanded.

[0058] Therefore, in the embodiment of the present invention, based on the design of the expansion member 220 as an arc-shaped plate 221 or an annular plate, more than two slide grooves 2112 are further arranged at even intervals around the axial direction X of the guide member 211 in the guide member 211 and corresponding movable members 212 are configured, so that the arc-shaped plate 221 can achieve the uniform expansion of the pipeline 1 to be expanded, thereby improving the expansion accuracy of the tensioning device described in the present invention and achieving a good tensioning effect.

[0059] like Figure 2 and Figure 4 As shown, the movable part 212 is slidably arranged in the slide groove 2112, so that the expansion member 220 can produce relative displacement to the guide member 211 along the radial direction R. The movable part 212 produces relative displacement to the guide member 211 along the radial direction R, thereby driving the expansion member 220 to produce relative displacement to the guide member 211 along the radial direction. The expansion member 220 can expand or contract along the radial direction R toward the side away from the guide member 211.

[0060] In some embodiments, Figure 2As shown, one end of the movable part 212 facing the accommodating chamber 2111 is equivalent to the piston head, and the other end of the movable part 212 facing the expansion member 220 is equivalent to the piston head. The piston head slides in the slide groove 2112, and the piston head abuts against the slide groove 2112 to achieve a sealing connection between the piston head and the slide groove 2112. The piston head is preferably an elastomer, and the end of the piston rod away from the piston head is connected to the side of the arc plate 221 facing the guide member 211; the piston head, the slide groove 2112 and the accommodating chamber 2111 enclose a closed area; when the volume of the closed area changes or the pressure value in the closed area changes, the piston head slides in the slide groove 2112; the piston head and the piston rod are fixedly connected, and the piston rod and the arc plate 221 are fixedly connected. When the arc plate 221 needs to withdraw from the pipeline 1 to be expanded, the piston head slides in the slide groove 2112 toward the side close to the accommodating chamber 2111, and the piston head drives the arc plate 221 to move toward the side close to the guide member 211 through the piston rod until the arc plate 221 abuts against the guide member 211, and the piston head and the piston rod stop moving; or, when the side of the arc plate 221 away from the guide member 211 abuts against the inner wall 2 of the pipeline 1 to be expanded and expands the inner wall 2, the piston head slides in the slide groove 2112 toward the side away from the accommodating chamber 2111, and the piston head drives the arc plate 221 to move toward the side away from the guide member 211 through the piston rod until the arc plate 221 presses the inner wall 2 tightly, and the piston head and the piston rod of the movable member 212 stop moving.

[0061] In some specific embodiments, Figure 1 As shown, the guide member 211 is connected to the moving mechanism 300, and the guide member 211 is arranged between the moving mechanism 300 and the clamping mechanism 100. The moving mechanism 300 is used to drive the guide member 211 to move toward or away from the clamping mechanism 100. The moving mechanism 300 can drive the guide member 211 along the axial direction X to enter or exit the pipeline 1 to be expanded clamped by the clamping mechanism 100.

[0062] In some embodiments of the present invention, the guide member 211 is a spherical structure member or a cylindrical structure member.

[0063] In some embodiments, such as Figure 1As shown, the clamping mechanism 100 includes a clamping portion 110 and a lifting portion 120. The clamping portion 110 is used to clamp the pipeline 1 to be expanded along the axial direction X; the lifting portion 120 is connected to the clamping portion 110 to adjust the height of the pipeline 1 to be expanded in the vertical direction along the axial direction X. Among them, the clamping portion 110 is a pipeline fixing clamping device, which can be a pipe clamping clamp, used to clamp and fix the hard pipe of the pipeline 1 to be expanded from the rear periphery, wherein the pipe clamping clamp can be two semicircular workpieces that can be flipped open or other conventional types of structures, after clamping and fixing the pipeline 1 to be expanded, the center line of the pipeline 1 to be expanded along the axial direction X coincides with the central axis of the moving mechanism 300 along the axial direction X. The lifting portion 120 can be a plurality of lifting rods extending in the vertical direction of the axial direction X.

[0064] In some embodiments, such as Figure 1 and Figure 2 As shown, the moving mechanism 300 includes a plurality of telescopic members 310, any two adjacent telescopic members 310 are connected, the telescopic members 310 are arranged along the axial direction X, and may be a plurality of telescopic members 310 that are sequentially sleeved, the telescopic direction of the telescopic members 310 being the same as the axial direction X, wherein a telescopic member 310 located at the end is connected to the radial expansion mechanism 200, further, the telescopic member 310 is connected to the linear drive 210, so that the linear drive 210 drives the expansion member 220 to enter the pipeline 1 to be expanded, and the radial expansion mechanism 200 enters the pipeline 1 to be expanded as a whole, or a telescopic member 310 located at the end is connected to the clamping mechanism 100, so that the telescopic member 310 drives the clamping mechanism 100 and the pipeline 1 to be expanded clamped therein to move along the axial direction X, so that the radial expansion mechanism 200 moves toward or away from the clamping mechanism 100, and then the radial expansion mechanism 200 moves along the axial direction X relative to the pipeline 1 to be expanded clamped by the clamping mechanism 100.

[0065] In some embodiments, any two adjacent telescopic members 310 can be movably connected together to form a telescopic member 310, or can be stretched to multiple telescopic members 310 that are connected in sequence and have relatively fixed positions with each other. The rear end center of the radial expansion mechanism 200, that is, the rear end center of the linear drive 210, is fixedly connected to the front end of the moving mechanism 300.

[0066] It should be added that the radial expansion mechanism 200 is fixed to the front end of the multi-stage telescopic member 310, and the multi-stage telescopic member 310 is used to extend the radial expansion mechanism 200 into the interior of the pipeline 1 to be expanded to tightly support the inner wall 2 of the pipeline 1 to be expanded, and the multi-stage telescopic member 310 is also used to remove the radial expansion mechanism 200 from the opening of the pipeline 1 to be expanded after completing the tensioning action of the radial expansion mechanism 200. In addition, when the pipeline 1 to be expanded needs to be expanded and installed, the center line of the pipeline 1 to be expanded coincides with the center axis of the multi-stage telescopic member 310.

[0067] In some embodiments, the pipeline 1 to be expanded has a first center height along the axial direction X, and the moving mechanism 300 has a second center height along the axial direction X. When the expansion member 220 is located in the pipeline 1 to be expanded, the center of the pipeline 1 to be expanded and the center of the moving mechanism 300 are at the same height.

[0068] In some embodiments, such as Figure 1 and Figure 2 As shown, the driving mechanism 400 includes a connecting tube 410 and a driving member 420; the connecting tube 410 is passed through the guide member 211 and connected to the closed area; the driving member 420 is connected to one end of the connecting tube 410 away from the guide member 211, and provides a driving force to the closed area through the connecting tube 410 to drive the expansion member 220 to move away from the guide member 211.

[0069] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the guide member 211 is provided with an avoidance groove 2113, one end of the avoidance groove 2113 is connected to the accommodating cavity 2111, and the other end passes through the surface of the guide member 211 to accommodate the connecting tube 410, that is, the connecting tube 410 is passed through the avoidance groove 2113 and extends into the closed area, and the driving member 420 is used to drive the movable member 212 to slide relative to the slide groove 2112. In addition, it is used to make the expansion member 220 produce relative displacement to the guide member 211 along the radial direction R. Specifically, the driving member 420 includes but is not limited to a press and a manual pressure supply unit. The press can be at least one of a hydraulic press, an electric press and a hybrid press. The driving member 420 provides pressure to the closed area through the connecting tube 410, which can change the pressure value in the closed area to a preset threshold and drive the movable member 212 to slide relative to the slide groove 2112.

[0070] In a specific embodiment, when the driving member 420 is a press, and further a hydraulic press, the accommodating chamber 2111 is equivalent to a hydraulic chamber, the connecting pipe 410 is equivalent to a hydraulic pipe, the hydraulic chamber is connected to the hydraulic press through the hydraulic pipe, and the side of the arc plate 221 close to the guide member 211 extends into the slide groove 2112 through the movable member 212, the slide groove 2112 is opened on the guide member 211 along the radial direction R, and the slide groove 2112 is connected to the hydraulic chamber. When the expansion member 220 extends into the pipeline 1 to be expanded, the hydraulic press is started to slowly fill the radial expansion mechanism 200 with hydraulic oil, and each movable member 212 can be extended synchronously, so that the arc plate 221 pushes the pipeline 1 to be expanded to expand, until the inner diameter of the pipeline 1 to be expanded is expanded to a preset threshold, the hydraulic oil is stopped and maintained for a period of time, and the expansion of the pipeline 1 to be expanded is completed. Through the driving member 420, such as a hydraulic press, each arc plate 221 can be automatically pushed to expand synchronously and uniformly in the circumferential direction of the guide member 211. The radial expansion mechanism 200 is synchronously stretched and expanded in the circumferential direction under the drive of the hydraulic pressure provided by the hydraulic press, and can expand slowly according to the set program.

[0071] In some embodiments, such as Figure 1 As shown, the mobile mechanism 300 also includes a carrier 320, which is movable along the axial direction X, and the clamping mechanism 100 and the telescopic member 310 are fixedly installed on the carrier 320. The carrier 320 can be a vehicle body, which can be a mobile base. The vehicle body is convenient for the movement of the tensioning device and the integration of various supporting tools. The vehicle body can be self-powered or manually pushed. When it is automatically powered, it is preferably an electric trolley driven by a lithium battery. The clamping part 110 of the tensioning device, such as a pipe fixing clamping device, the driving member 420, such as a hydraulic workstation or a hydraulic press, the multi-stage telescopic member 310, the radial expansion mechanism 200, and other tool boxes for placing conventional maintenance tools can be arranged on the carrier 320, wherein the maintenance tools include at least one of a wrench, a multimeter, and conventional spare parts.

[0072] In some embodiments, Figure 1 As shown, the moving mechanism 300 also includes a support rod 330, one end of the telescopic rod 310 at the end is connected to the support rod 330, and the support rod 330 is installed on the carrier 320. The support rod 330 is used to fix the end of the multi-stage telescopic member 310 to ensure that the multi-stage telescopic member 310 is horizontal. The multi-stage telescopic member 310 can be an electric push rod, and the electric push rod can adopt a hydraulic drive or an electric drive power mode.

[0073] In the tensioning device of the present application, the radial expansion mechanism 200 can expand itself radially, and the expansion member 220 can utilize its own radial expansion to gradually press against the inner wall 2 of the pipeline 1 to be expanded while fitting with the inner wall 2 of the pipeline 1 to be expanded, so that the inner wall 2 gradually deforms to achieve the expansion of the pipeline 1 to be expanded. The hydraulic pressure of the driving member 420 is utilized to automatically push each arc plate 221 to expand uniformly in the radial direction R synchronously, and it can expand slowly according to the set program, with high precision and good tensioning effect.

[0074] The present invention further provides an expansion method for a tensioning device. Based on the tensioning device as described in any one of the above items, the expansion method comprises:

[0075] Step 100: Install the pipeline 1 to be expanded on the clamping mechanism 100;

[0076] In this step 100, the pipeline 1 to be expanded is fixed to the clamping part 110 of the clamping mechanism 100, such as a pipe clamp, and a portion of the pipeline 1 to be expanded is exposed forward;

[0077] Step 200: The lifting unit 120 adjusts the pipeline 1 to be expanded so that the center of the pipeline 1 to be expanded and the center of the moving mechanism 300 are at the same height;

[0078] In this step 200, the height of the pipeline to be expanded 1 is adjusted by the lifting unit 120 so that the first height center of the pipeline to be expanded 1 along the axial direction X is equal to the second height center of the moving mechanism 300 along the axial direction X;

[0079] Step 300: The moving mechanism 300 extends the radial expansion mechanism 200 into the pipeline 1 to be expanded, so that the expansion member 220 pushes the pipeline 1 to be expanded to expand until the inner diameter expands to a preset value.

[0080] In this step 300, the radial expansion mechanism 200 is extended into the pipeline 1 to be expanded by the moving mechanism 300, and then the driving member 420, such as a hydraulic press, is started to slowly fill the radial expansion mechanism 200 with hydraulic oil, so that the movable parts 212 extend synchronously, so that the movable parts 212 drive the expansion parts 220 to push the pipeline 1 to be expanded to expand, until the inner diameter of the pipeline 1 to be expanded is expanded to a preset value, and then the delivery of hydraulic oil is stopped and maintained for a period of time, thereby completing the expansion of the pipeline 1 to be expanded.

[0081] In this expansion method, the pipeline 1 to be expanded is installed on the clamping part 110, and the lifting part 120 adjusts the pipeline 1 to be expanded so that the center of the pipeline 1 to be expanded and the center of the moving mechanism 300 are at the same height. The moving mechanism 300 extends the radial expansion mechanism 200 into the pipeline 1 to be expanded, so that the expansion piece 220 pushes the pipeline 1 to be expanded to expand until the inner diameter expands to a preset value and stops expanding.

[0082] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0083] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A tensioning device, characterized in that: include: A clamping mechanism, used for clamping the pipe to be expanded; A radial expansion mechanism includes a linear drive and an expansion piece, wherein the linear drive is used to enter or exit the pipeline to be expanded along the axial direction, the expansion piece is connected to the linear drive and is circumferentially arranged on the outside of the linear drive around the axial direction, and can move toward or away from the linear drive to adjust the inner diameter of the pipeline to be expanded.

2. The tensioning device according to claim 1, characterized in that: Also includes: The moving mechanism is connected to the radial expansion mechanism to drive the radial expansion mechanism to move toward or away from the clamping mechanism, or is connected to the clamping mechanism to drive the clamping mechanism to move toward or away from the radial expansion mechanism.

3. The tensioning device according to claim 2, characterized in that: Also includes: A driving mechanism is connected to the radial expansion mechanism to drive the expansion member to move toward or away from the linear drive.

4. The tensioning device according to claim 1, characterized in that: The expansion member includes a plurality of arc-shaped plates, each of which is connected to the linear drive, and the plurality of arc-shaped plates are arranged in a circumferential array around the axial direction on the outer side of the linear drive.

5. The tensioning device according to claim 3, characterized in that: The linear drive comprises: A guide member, movable along the axial direction, and provided with a communicating accommodation cavity and a slide groove, wherein the slide grooves are arranged in a circumferential array around the axial direction outside the accommodation cavity; The movable part is adapted in the slide groove and connected to the expansion part; wherein, The movable member, the slide groove and the accommodating cavity enclose a closed area. When the pressure value in the closed area is less than or equal to a preset threshold and the pressure value increases, the expansion member moves away from the linear drive.

6. The tensioning device according to claim 1, characterized in that: The clamping mechanism comprises: A clamping portion, used to clamp the pipeline to be expanded along the axial direction; The lifting part is connected to the clamping part to adjust the height of the pipeline to be expanded in the vertical direction along the axial direction.

7. The tensioning device according to claim 2, characterized in that: The moving mechanism comprises: A plurality of telescopic parts, any two adjacent telescopic parts are connected, and the telescopic parts are arranged along the axial direction, wherein a telescopic part located at an end is connected to the radial expansion mechanism, or a telescopic part located at an end is connected to the clamping mechanism.

8. The tensioning device according to claim 5, characterized in that: The driving mechanism comprises: A connecting pipe, passing through the guide member and communicating with the closed area; The driving member is connected to one end of the connecting tube away from the guiding member, and provides a driving force to the enclosed area through the connecting tube to drive the expansion member to move away from the guiding member.

9. The tensioning device according to claim 8, characterized in that: The guide member is provided with an avoidance groove, one end of the avoidance groove is connected to the accommodating cavity, and the other end thereof penetrates through the surface of the guide member to accommodate the connecting pipe.

10. The tensioning device according to claim 7, characterized in that: The moving mechanism also includes: The carrier is movable along the axial direction, and the clamping mechanism and the telescopic member are installed on the carrier.

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