CN209998668U - pipe group correction connecting tool - Google Patents

pipe group correction connecting tool Download PDF

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Publication number
CN209998668U
CN209998668U CN201920311533.XU CN201920311533U CN209998668U CN 209998668 U CN209998668 U CN 209998668U CN 201920311533 U CN201920311533 U CN 201920311533U CN 209998668 U CN209998668 U CN 209998668U
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China
Prior art keywords
clamping
balance arm
pipe
arm
connecting screw
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CN201920311533.XU
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Chinese (zh)
Inventor
刘成冬
仇远
关明朗
王琍
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Beijing Capital Airport Power And Energy Co Ltd
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Beijing Capital Airport Power And Energy Co Ltd
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Abstract

The utility model relates to a building site pipeline construction technology, in particular to kinds of pipeline group correction connecting means, the utility model discloses a pipeline group correction connecting means includes the balance arm, the platelike structure that the balance arm level set up, pipeline centre gripping and positioning mechanism install in wherein end of balance arm is used for the centre gripping and fixes a position wherein pipelines, pipeline centre gripping and displacement adjustment mechanism install in another end of balance arm for pipelines in addition are used for the centre gripping, and adjust its with the interval of balance arm, adjust the axiality of two pipelines with this.

Description

pipe group correction connecting tool
Technical Field
The utility model relates to a building site pipeline construction technique, in particular to kinds of pipeline group correct connecting means.
Background
In the building construction site, two butted pipelines are often required to be welded and communicated, the two pipelines are required to be adjusted to be coaxial and then welded firmly before welding, in the adjusting process, due to the fact that no special adjusting tool is arranged, manual repeated correction is required for adjusting, other series auxiliary tools such as pipe clamps and the like are required to be utilized, the time consumed for times of butting is long, the labor intensity of workers is high, the coaxiality is poor, the situation that the two pipelines are inclined after welding often occurs, and subsequent normal use is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that kinds of pipeline group correction connecting tool are provided, the effectual defect of overcoming prior art.
The utility model provides a technical scheme as follows, kind pipeline group corrects connecting means for correct the axiality when two pipelines butt joint, this pipeline group corrects connecting means includes the balance arm, the platelike structure that above-mentioned balance arm level set up, pipeline centre gripping and positioning mechanism, above-mentioned pipeline centre gripping and positioning mechanism install in the wherein end of above-mentioned balance arm, be used for the centre gripping and fix a position wherein pipelines, pipeline centre gripping and displacement adjustment mechanism, above-mentioned pipeline centre gripping and displacement adjustment mechanism install in the end in addition of above-mentioned balance arm, be used for the centre gripping in addition pipelines, and adjust its and the interval of above-mentioned balance arm, with this axiality of adjusting two pipelines.
The utility model has the advantages that: structural design is reasonable, and convenient to use can quick adjustment realize the coaxial butt joint of two pipelines, has improved work efficiency, has reduced the cost of labor, has improved follow-up operation welding quality and fail safe nature, has stopped to leak to weld and has askew welded.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
, the pipe clamping and positioning mechanism comprises a clamp piece, a 0 clamp piece and a positioning link rod, wherein the 1 clamp piece is arranged at side of the end of the balance arm , the clamp piece is arranged at side of the clamp piece opposite to the balance arm and is used for clamping a pipe, the positioning link rod is arranged between the clamp piece and the balance arm and is vertical to the balance arm, and two ends of the positioning link rod are respectively connected and fixed with the middle part of the clamp piece at the other side and the balance arm.
The scheme of advancing has the advantages that the design of the pipeline clamping and positioning mechanism is simple, and the coaxiality of two pipelines can be effectively adjusted by adjusting pipelines according to the reference of coordinates of the pipeline clamping and positioning mechanism.
, the pipe clamping and positioning mechanism includes a clamping member, a 0 connecting member and a 1 connecting screw, the 2 connecting member is disposed at 634 side of the ends of the balance arms , the clamping member is mounted at side of the connecting member facing away from the balance arms for clamping the pipe, the connecting screw is disposed perpendicular to the balance arms, an end of the connecting screw is rotatably connected to a middle portion of the connecting member on the other side, the 1 end of the balance arm is disposed at a position corresponding to the 2 connecting screw with a th threaded hole penetrating through both sides thereof, another end of the connecting screw penetrates through the th threaded hole and is threadedly connected to the th threaded hole, a guiding rod parallel to the connecting screw is fixed at a position of the connecting member near the side of the balance arms, the guiding rod is far from the connecting member and is movable relative to the balance arms .
Adopt above-mentioned step's of advancing beneficial effect to be that structural design is simple, reasonable, and the flexible operation, convenience, the displacement of regulation centre gripping pipeline that can be quick to can realize the synchronous displacement regulation of two pipelines, improve the operating efficiency greatly.
, the lower end of the connecting screw rod vertically penetrates the middle part of the connecting piece and can rotate relative to the connecting piece, and the upper end and the lower end of the connecting piece are respectively provided with nuts which are in threaded connection with the connecting screw rod.
Adopt the above-mentioned beneficial effect who advances step scheme to be favorable to the connecting screw and the good rotation of connecting piece to be connected, in addition, connecting screw dismouting is also more convenient.
, the pipe clamping and displacement adjusting mechanism comprises a second clamping piece, a second connecting piece and a second connecting screw, wherein the second connecting piece is arranged at 0 side of the zero end of the balance arm and is positioned at side of the balance arm from the 1 connecting piece 2, the second clamping piece is arranged at side of the second connecting piece away from the balance arm and is used for clamping a pipe, the second connecting screw is vertically arranged with the balance arm, the end of the second connecting piece is rotatably connected with the middle part of the other side of the second connecting piece, the end of the balance arm is provided with a second threaded hole through two sides of the second connecting screw corresponding to the position of the second connecting screw, the other end of the second connecting screw passes through the second threaded hole and is in threaded connection with the second threaded hole, a second guide rod parallel to the second connecting screw is fixed at the side of the second connecting piece close to the balance arm, and the second guide rod is far from the end of the second connecting piece and can move relative to the balance arm.
Adopt above-mentioned step's of advancing beneficial effect to be that structural design is simple, reasonable, and the flexible operation, convenience can be quick the regulation pipeline of centre gripping and pipeline's axiality in addition.
And , vertically penetrating the lower end of the second connecting screw through the middle part of the second connecting piece and rotating relative to the second connecting piece, wherein the upper and lower ends of the second connecting piece are respectively provided with a second nut in threaded connection with the second connecting screw.
Adopt above-mentioned beneficial effect who advances step scheme to do benefit to the second connecting screw and be connected with the good rotation of second connecting piece, simultaneously, the second connecting screw dismouting is also more convenient.
, the clamp includes two circular arc-shaped pieces, the two 0 clips are fixed on the 2 side of the 1 connecting piece away from the balance arm in parallel and at intervals, the arc-shaped openings of the two pieces are close to each other, the 4 ends of the two 3 clips are respectively connected and fixed with the side of the connecting piece away from the balance arm, the ends are connected with each other through a bolt penetrating through the two pieces, a clamping area for clamping the pipeline is formed between the two clips, and the size of the clamping area can be adjusted by screwing and pre-tightening the bolt.
Adopt above-mentioned step's of advancing beneficial effect to be that pipeline centre gripping and dismouting are all convenient, swift.
, the second clamping piece includes two arc clips, the two clips are fixed in the side of the second connecting piece away from the balance arm in parallel and at intervals, the arc openings of the two clips are close to each other, the ends of the two clips are respectively connected and fixed with the side of the second connecting piece away from the balance arm, the ends are connected with each other through a second bolt assembly penetrating through the two clips, a second clamping area for clamping the pipeline is formed between the two clips, and the size of the second clamping area can be adjusted by pre-tightening the second bolt.
Adopt above-mentioned step's of advancing beneficial effect to be that pipeline centre gripping and dismouting are all convenient, swift.
Drawings
FIG. 1 is a cross-sectional view of a tube set straightening connection tool of example ;
FIG. 2 is a schematic view of a tube set straightening connection tool according to an embodiment ;
FIG. 3 is a side view of the tube set straightening connection tool of example ;
FIG. 4 is a sectional view showing the structure of the rectification connecting tool for piping set according to the second embodiment;
fig. 5 is a schematic structural view of the pipe set straightening connection tool according to the second embodiment.
In the drawings, the components represented by the respective reference numerals are listed below:
1. balance arm, 2, pipeline centre gripping and positioning mechanism, 3, pipeline centre gripping and displacement adjustment mechanism, 21, th holder, 22, connecting piece, 23, location connecting rod, 24, connecting screw, 31, second holder, 32, second connecting piece, 33, second connecting screw, 211, clamping piece, 221, guide bar, 311, clamping piece, 321, second guide bar.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Embodiment As shown in FIGS. 1 to 3, the pipe straightening and connecting tool of the present embodiment is used for straightening the coaxiality of two pipes when the two pipes are butted, and comprises a balance arm 1, a plate-shaped structure horizontally arranged on the balance arm 1, a pipe clamping and positioning mechanism 2, the pipe clamping and positioning mechanism 2 is arranged at end of the balance arm 1 and is used for clamping and positioning pipes, and a pipe clamping and displacement adjusting mechanism 3, the pipe clamping and displacement adjusting mechanism 3 is arranged at the other end of the balance arm 1 and is used for clamping another pipes and adjusting the distance between the pipe clamping and displacement adjusting mechanism and the balance arm 1 so as to adjust the coaxiality of the two pipes.
Wherein the pipe gripping and positioning mechanism 2 cannot adjust the distance between the pipe and the balance arm 1, i.e. only adjust the coaxiality of of the pipes relative to the other pipes, specifically, when adjusting the coaxiality of two butted pipes, it operates as follows:
the pipeline clamping and positioning mechanism 2 and the pipeline clamping and displacement adjusting mechanism 3 respectively clamp ends of two pipelines which are mutually butted, the axes of pipelines clamped by the balance arm 1 and the pipeline clamping and positioning mechanism 2 are mutually parallel and are positioned above the two pipelines, the lower step is carried out, the pipeline clamping and displacement adjusting mechanism 3 is used for adjusting the parallelism between the other pipelines and the balance arm 1 and adjusting the vertical distance between the other pipelines and the balance arm 1 until the vertical distance between the two pipelines and the balance arm 1 is , then the balance arm 1 is rotated by 90 degrees around the two pipelines to any side of the two pipelines, the balance arm 1 and the pipelines clamped by the pipeline clamping and positioning mechanism 2 are continuously kept mutually parallel, the lower step is carried out, the pipeline clamping and displacement adjusting mechanism 3 is used for adjusting the parallelism between the other pipelines and the balance arm 1 again and adjusting the vertical distance between the two pipelines and the balance arm 1 until the vertical distance between the two pipelines and the balance arm 1 is , the two pipelines are completely in a coaxial butt joint state, and the whole pipeline welding correction tool can be removed and connected.
Specifically, the method comprises the following steps:
the pipe clamping and positioning mechanism 2 may include a -th clamp 21, a -th connector 22, and a positioning link 23, wherein the 0-th connector 22 is disposed on a 2 side of the 1 1-end of the balance arm 1, the 3-th clamp 21 is attached to a side of the -th connector 22 facing away from the balance arm 1 and clamps the pipe, the positioning link 23 is disposed between the -th connector 22 and the balance arm 1 and is perpendicular to the balance arm 1, both ends of the positioning link 23 are fixedly connected to the middle of the -th connector 22 on the other -side and the balance arm 1, and the clamp is configured such that the -th clamp 21 is inserted outside the -end where pipes are butted when clamping.
Preferably, the pipe clamping and displacement adjusting mechanism 3 comprises a second clamping member 31, a second connecting member 32 and a second connecting screw 33, the second connecting member 32 is disposed on side of the zero end of the balance arm 1 and is located on side of the balance arm 1 from the 0 connecting member 22 , the second clamping member 31 is mounted on side of the second connecting member 32 facing away from the balance arm 1 for clamping a pipe, the second connecting screw 33 is disposed perpendicular to the balance arm 1, 894 end thereof is rotatably connected to middle of the other 965 side of the second connecting member 32, the balance arm 1 end is provided with a second threaded hole through which two sides penetrate corresponding to the second connecting screw 33, the other end of the second connecting screw 33 penetrates through the second threaded hole and is in threaded connection with the second threaded hole, the second connecting member 32 side close to the 398 side of the balance arm 1 is fixed with a second threaded hole which is parallel to the second connecting screw 33, the second connecting screw 33 is threaded through the second threaded hole and is connected with the second threaded hole, the second connecting screw 32, the second connecting member 32 is capable of being moved vertically and rotated to adjust the distance between the second clamping member 638 side of the second connecting member 31 and the second connecting member 638, the second connecting member 32 is adjusted to clamp the second clamping arm, the second clamping arm 32 is rotated vertically and the second connecting member, the second connecting member 32 clamp the pipe, the second connecting member 32 clamp, the pipe clamp is rotated to adjust the pipe, the pipe clamp length of the pipe clamp arm, the pipe clamp mechanism 2 clamp length of the pipe, the pipe clamp length of the pipe clamp arm 2 clamp length of the pipe, the pipe clamp arm 2 clamp arm, the pipe clamp arm 2 clamp arm, the pipe clamp arm 2 clamp arm is adjusted by.
Preferably, the lower end of the second connecting screw 33 vertically penetrates the middle portion of the second connecting member 32 and can rotate relative to the second connecting member 32, and the upper and lower ends of the second connecting member 32 are respectively provided with a second nut in threaded connection with the second connecting screw 33, which is simple in design and facilitates good rotational connection between the second connecting screw 33 and the second connecting member 32.
Preferably, the -th clamping piece 21 includes two circular arc-shaped clamping pieces, the two -th clamping pieces 211 are fixed on the 1 side of the 0-th connecting piece 22 away from the balance arm 1 in parallel and at intervals, the two arc-shaped openings are close to each other, 3 ends of the two 2-th clamping pieces 211 are respectively connected and fixed with the 5 side of the 4-th connecting piece 22 away from the balance arm 1, the 6 ends are connected with each other through bolts penetrating through the two ends, a -th clamping area for clamping the pipeline is formed between the two -th clamping pieces 211, the size of the -th clamping area can be adjusted by screwing and pre-tightening the -th bolts, when clamping the pipeline, the two -th clamping pieces 211 are respectively attached to both sides of the pipeline, and then the -th bolt is screwed to enable the two -th clamping pieces 211 to clamp the pipeline.
Preferably, the second clamping member 31 includes two circular arc-shaped second clamping pieces 311, the two th clamping pieces 311 are fixed in parallel and at intervals on the side of the second connecting member 32 away from the balance arm 1, and the two arc-shaped openings are close to each other, the ends of the two second clamping pieces 311 are respectively connected and fixed with the side of the second connecting member 32 away from the balance arm 1, the ends are connected with each other through a second bolt assembly penetrating through the two clamping pieces, a second clamping area for clamping the pipe is formed between the two second clamping pieces 311, the size of the second clamping area can be adjusted by pre-tightening the second bolt, when the pipe is clamped, the two second clamping pieces 311 are respectively attached to the two sides of the pipe, and then the th bolt is screwed so that the two second clamping pieces 311 clamp the pipe.
Example two: as shown in fig. 4 and 5, the pipe group straightening connection tool of the present embodiment, wherein the pipe clamping and positioning mechanism 2 and the pipe clamping and displacement adjusting mechanism 3 can both adjust the distance between the pipe clamped by the pipe clamping and positioning mechanism and the balance arm 1, that is, the distance between the pipe and the balance arm 1 can be adjusted simultaneously by two pipes, and the specific operations are as follows:
the method comprises the following steps of respectively clamping ends of two pipelines which are mutually butted by a pipeline clamping and positioning mechanism 2 and a pipeline clamping and displacement adjusting mechanism 3, enabling a balancing arm 1 and pipeline axes clamped by the pipeline clamping and positioning mechanism 2 to be mutually parallel and to be positioned above the two pipelines, adjusting the parallelism between the two pipelines and the balancing arm 1 through the pipeline clamping and positioning mechanism 2 and the pipeline clamping and displacement adjusting mechanism 3 respectively in a lower step, adjusting the vertical distance between the two pipelines and the balancing arm 1 until the vertical distance between the two pipelines and the balancing arm 1 is equal to , rotating the balancing arm 1 around the two pipelines to any sides of the two pipelines by 90 degrees, adjusting the parallelism between the two pipelines and the balancing arm 1 through the pipeline clamping and positioning mechanism 2 and the pipeline clamping and displacement adjusting mechanism 3 again in a lower step, adjusting the vertical distance between the two pipelines and the balancing arm 1 until the vertical distance between the two pipelines and the balancing arm 1 is equal to enable the two pipelines to be adjusted to be in a state, welding is completed, and the whole pipeline group correction tool is removed after the welding is completed.
Preferably, the pipe clamping and positioning mechanism 2 includes a th clamping member 21, a th connecting member 22 and a th connecting screw 24, the th connecting member 22 is disposed on a side of the end of the balance arm 1, the th clamping member 21 is mounted on a side of the th connecting member 22 away from the balance arm 1 for clamping a pipe, the th connecting screw 24 is disposed perpendicular to the balance arm 1, an th end thereof is rotatably connected to a middle portion of the side of the 869 th connecting member 22, the th balancing arm 1 0 end is provided with a th threaded hole penetrating through both sides thereof at a position corresponding to the th connecting screw 24, another 4 end of the th connecting screw 24 penetrates through the th threaded hole and is threadedly connected to the th threaded hole, the th connecting screw 24 is fixed to a side of the th connecting screw 24 adjacent to the balance arm 1 and is threaded with the th threaded hole, the th connecting member is capable of being moved through a guiding rod 221, and a guiding rod 221 is capable of adjusting the pipe quickly and adjusting the pipe clamping and adjusting the pipe quickly and adjusting the pipe.
Preferably, the th connecting screw 24 has a lower end vertically penetrating the middle of the th connecting member 22 and being rotatable relative to the th connecting member 22, and the th connecting member 22 has upper and lower ends respectively provided with th nuts threadedly coupled to the th connecting screw 24, which is simple and facilitates the good rotational coupling between the th connecting screw 24 and the th connecting member 22.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1, A pipe straightening connection tool for straightening the coaxiality of two pipes in butt joint, wherein the pipe straightening connection tool comprises:
the balance arm (1) is of a plate-shaped structure, and the balance arm (1) is horizontally arranged;
the pipe clamping and positioning mechanism (2) is arranged at the end of the balance arm (1) and is used for clamping and positioning pipes;
the pipeline clamping and displacement adjusting mechanism (3) is mounted at the other ends of the balance arm (1) and used for clamping another pipelines and adjusting the distance between the pipeline clamping and displacement adjusting mechanism and the balance arm (1) so as to adjust the coaxiality of the two pipelines.
2. kinds of pipe group correction connection tool according to claim 1, wherein the pipe clamping and positioning mechanism (2) comprises a th clamping piece (21), a 0 th connecting piece (22) and a positioning link (23), the 1 th connecting piece (22) is arranged at side of the end of the balance arm (1), the th clamping piece (21) is arranged at side of the th connecting piece (22) opposite to the balance arm (1) and is used for clamping a pipe, the positioning link (23) is arranged between the th connecting piece (22) and the balance arm (1) and is perpendicular to the balance arm (1), and two ends of the positioning link (23) are respectively connected and fixed with the middle of the th connecting piece (22) and the other side of the balance arm (1).
3. pipe set straightening connection tool according to claim 1, characterized in that the pipe clamping and positioning device (2) comprises a -th clamping part (21), a -th connecting part (22) and a -th connecting screw (24), the -th connecting part (22) is arranged on the 634 side of the 593 end of the balancing arm (1), the -th clamping part (21) is mounted on the side of the -th connecting part (22) facing away from the balancing arm (1) for clamping a pipe, the -th connecting screw (24) is arranged perpendicular to the balancing arm (1), the 869 end of the -th connecting screw is pivotally connected to the middle of the 867-th connecting part (22) on the other 8740 side, the balancing arm (1) -th end is provided with a -th threaded hole penetrating through the balancing arm (1) at a position corresponding to the -th connecting screw (24), the -th connecting screw (24) passes through the -th threaded hole, the -is guided in parallel to the balancing arm () and is guided through the balancing arm -.
4. kinds of pipe group straightening and connecting tool according to claim 3, wherein the lower end of the th connecting screw rod (24) passes through the middle of the th connecting piece (22) up and down and can rotate relative to the th connecting piece (22), and the upper end and the lower end of the th connecting piece (22) are respectively provided with a th nut which is in threaded connection with the th connecting screw rod (24).
5. The tool for the corrective connection of groups of pipes according to claim 2 or 3, characterized in that the means for clamping and displacing the pipes (3) comprise a second clamping member (31), a second connecting member (32) and a second connecting screw (33), the second connecting member (32) being arranged on the side of the balance arm (1) from the zero end and being located on the same side of the balance arm (1) as the 1 connecting member (22) , the second clamping member (31) being mounted on the side of the second connecting member (32) facing away from the balance arm (1) for clamping the pipes, the second connecting screw (33) being arranged perpendicular to the balance arm (1) and having its end rotationally connected to the middle of the other side of the second connecting member (32), the balance arm (1) having a second threaded hole running through it at the end corresponding to the second connecting screw (33), the second connecting screw (33) passing through the threaded hole of the second connecting screw (33) and being movable relative to the second connecting member (32) and being guided through the threaded hole of the balance arm (1), the guide rod (321) being parallel to the balance arm (1).
6. pipe group straightening and connecting tool according to claim 5, wherein the lower end of the second connecting screw rod (33) passes through the middle of the second connecting piece (32) up and down and can rotate relative to the second connecting piece (32), and the upper and lower ends of the second connecting piece (32) are respectively provided with a second nut in threaded connection with the second connecting screw rod (33).
7. pipe group correction connection tool as claimed in claim 5, wherein the clamp (21) includes two 0 clips (211) in the shape of circular arc, two 1 clips (211) are fixed on the 3 side of the 2 connector (22) away from the balance arm (1) in parallel and spaced, and the arc openings of the two clips are close to each other, the 5 ends of the two 4 clips (211) are respectively connected and fixed with the side of the connector (22) away from the balance arm (1), the other ends are connected with each other by a bolt penetrating through the two clips, a clamping area for clamping the pipe is formed between the two clips (211), and the size of the clamping area can be adjusted by screwing and pre-tightening the bolt.
8. pipe group straightening and connecting tool according to claim 5, wherein the second clamping member (31) includes two circular arc-shaped second clamping pieces (311), the two second clamping pieces (311) are fixed in parallel and spaced at the side of the second connecting member (32) away from the balance arm (1) and the arc-shaped openings of the two second clamping pieces are close to each other, the ends of the two second clamping pieces (311) are respectively connected and fixed with the side of the second connecting member (32) away from the balance arm (1), the other ends are connected with each other by a second bolt assembly penetrating through the two clamping pieces, a second clamping area for clamping the pipe is formed between the two second clamping pieces (311), and the size of the second clamping area can be adjusted by pre-tightening the second bolt.
CN201920311533.XU 2019-03-12 2019-03-12 pipe group correction connecting tool Active CN209998668U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920311533.XU CN209998668U (en) 2019-03-12 2019-03-12 pipe group correction connecting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920311533.XU CN209998668U (en) 2019-03-12 2019-03-12 pipe group correction connecting tool

Publications (1)

Publication Number Publication Date
CN209998668U true CN209998668U (en) 2020-01-31

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Application Number Title Priority Date Filing Date
CN201920311533.XU Active CN209998668U (en) 2019-03-12 2019-03-12 pipe group correction connecting tool

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112264762A (en) * 2020-11-30 2021-01-26 中冶宝钢技术服务有限公司 Pipeline centering adjusting device
CN113187954A (en) * 2021-04-29 2021-07-30 福建永宏建设工程有限公司 Construction method of large-caliber nodular cast iron water supply pipe in valley zone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112264762A (en) * 2020-11-30 2021-01-26 中冶宝钢技术服务有限公司 Pipeline centering adjusting device
CN113187954A (en) * 2021-04-29 2021-07-30 福建永宏建设工程有限公司 Construction method of large-caliber nodular cast iron water supply pipe in valley zone

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