CN110470249B - Method for detecting connection offset of long-distance straight pipe - Google Patents
Method for detecting connection offset of long-distance straight pipe Download PDFInfo
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- CN110470249B CN110470249B CN201910918419.8A CN201910918419A CN110470249B CN 110470249 B CN110470249 B CN 110470249B CN 201910918419 A CN201910918419 A CN 201910918419A CN 110470249 B CN110470249 B CN 110470249B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a detection method for long-distance straight pipe pipeline connection deviation, which comprises a front end measuring device and a rear end inspection device, wherein the front end measuring device comprises a front annular fixing hoop fixed at one end of a pipeline, an annular guide rail is arranged on the front annular fixing hoop in a surrounding mode, a laser emitting device slides on the annular guide rail, the rear end inspection device comprises a rear annular fixing hoop fixed at the other end of the pipeline, a mapping plate is fixed on the rear annular fixing hoop, and an annular scale mark is carved on one side, facing the front end measuring device, of the mapping plate. When the device is used, the positions of laser rays emitted by the laser emitting device at different positions on the mapping plate are recorded, and offset data of the pipeline is obtained by comparing the positions with the annular scale marks. The method is convenient and quick to use and high in accuracy.
Description
Technical Field
The invention relates to a pipeline deviation detection method, in particular to a detection method for long-distance straight pipeline connection deviation.
Background
In the pipeline installation project construction, there is a connection of long distance pipelines, in the pipeline installation construction specification, the indoor water supply pipeline is required: the allowable deviation per meter is 2mm, the total length is more than 25 meters, the allowable deviation is less than 25mm, and the outdoor water supply pipeline comprises: straight section more than 25 meters (starting point to end point), allow deviation 30 mm. Therefore, after two adjacent pipelines are connected, the axial deviation of the pipelines needs to be detected, and if the pipeline deviation is too large, the pipeline deviation not only easily interferes with other equipment, but also influences the sealing performance of the pipeline connection. For the offset detection of long distance pipes, the offset amplitude at the two ends of the pipe is the largest, so the positions of the two ends of the pipe are usually measured. In a conventional measurement, a fixed point is usually found as a reference object, and the relative positions of two ends of a pipeline relative to the reference object are respectively measured, but the measurement method is complex and has large measurement errors.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a detection method for long-distance straight pipe connection deviation, which is simple and convenient to use and high in measurement accuracy.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for detecting the connection offset of a long-distance straight pipe pipeline comprises the following steps:
(1) the long-distance straight pipe pipeline connection deviation detection device comprises a front end measurement device and a rear end inspection device, wherein the front end measurement device comprises a front annular fixing hoop formed by folding two semicircular hoops I, the two semicircular hoops I are detachably connected together through a front fixing piece, the inner diameter of the front annular fixing hoop is consistent with the outer diameter of a pipeline to be detected, semicircular guide rails fixedly connected with the semicircular hoops I are formed on the outer side surfaces of the semicircular hoops I in an extending mode along the bending direction of the semicircular hoops I, when the two semicircular hoops I are folded, the two semicircular guide rails can be folded to form an annular guide rail, the annular guide rail and the front annular fixing hoop are arranged on the same center line, the front end measurement device further comprises a sliding support, the sliding support is connected to the annular guide rail in a sliding mode so as to move circumferentially along the annular guide rail, a laser emission device is installed on the sliding support, and the laser, the rear end inspection device comprises a rear annular fixing hoop formed by folding two semicircular hoops II, the two semicircular hoops II are detachably connected together through a rear firmware, the inner diameter of the rear annular fixing hoop is consistent with the outer diameter of a pipeline to be detected, a half side plate fixedly connected with the semicircular hoops II is formed on the outer side surface of the semicircular hoops II along the bending direction of the semicircular hoops II in an extending mode, when the two semicircular hoops II are folded, the two half side plates can be spliced together to form a mapping plate, an annular scale mark which is arranged with the rear annular fixing hoop on the same center line is carved on the surface of one side of the mapping plate, and the diameter of the annular scale mark is consistent with the moving track diameter of laser light emitted by a laser emitting device moving around the annular;
(2) the method comprises the following steps that a front end measuring device is installed at one end of a pipeline, when the pipeline is installed, a sliding support is installed on one semicircular guide rail, then the pipeline is wrapped in two semicircular hoops I, the two semicircular hoops I are folded and fixed together by using a front fixing piece, and a front annular fixing hoop is formed and sleeved on the pipeline;
(3) installing a rear end inspection device at the other end of the pipeline, wrapping the pipeline in the rear end inspection device by using two semicircular hoops II, enabling one side where the annular scale mark is located to face the direction of the front end measurement device, folding and fixing the two semicircular hoops II together by using a rear fixing piece to form a rear annular fixed hoop sleeved on the pipeline;
(4) opening a laser emitting device, irradiating laser rays on a mapping plate, recording the position of the laser rays on the mapping plate, moving a sliding support on an annular guide rail for a distance, recording the position of the laser rays on the mapping plate again, repeatedly moving the sliding support for multiple times, recording the irradiation position of each laser ray, obtaining the irradiation position of the multiple laser rays on the mapping plate, comparing the irradiation position with the position of an annular scale mark, if the irradiation positions are overlapped with the annular scale mark, enabling the pipeline to have no offset, if the irradiation position deviates towards one side of the annular scale mark, enabling the pipeline to deviate, measuring the deviation size of the irradiation position and the position of the corresponding annular scale mark, and obtaining the deviation amount of the pipeline.
As an optimization, the outer side surface of the annular guide rail is concavely provided with an inverted T-shaped guide groove which is arranged with the same central line as the annular guide rail, the sliding support comprises an inner limiting block which is arranged in a transverse groove in the inverted T-shaped guide groove and can do circular motion along the inverted T-shaped guide groove, a limiting column is fixedly connected on the inner limiting block and extends along the radial direction of the annular guide rail, the limiting column penetrates through the notch of the inverted T-shaped guide groove and extends out of the inverted T-shaped guide groove, an outer limiting block is arranged on a column body of the inverted T-shaped guide groove, the limiting column penetrates through the outer limiting block and can be in sliding fit with the outer limiting block along the length direction of the limiting column, a limiting head is arranged on the column body of the limiting column extending out of the outer limiting block, a fixing spring is sleeved on the column body of the limiting column and between the limiting head and the outer limiting block, one, the other end of the laser emitting device is abutted to an outer limiting block, a fixing spring is used for tightly abutting the outer limiting block on the outer side face of the annular guide rail and tightly abutting an inner limiting block on the side wall of the inverted T-shaped guide groove on the top side of the transverse groove of the inverted T-shaped guide groove to provide spring force, and the laser emitting device is fixedly connected to one end, far away from the inner limiting block, of the limiting column.
When two semicircle clamps I have not closed up, when installing sliding support earlier: operate outer stopper, make it move on spacing post towards keeping away from interior stopper direction, and compress fixed spring simultaneously, increase of distance between interior stopper and the outer stopper like this, then will interior stopper from one of them semicircle clamp I in the shape of falling T guide slot tip slips into the shape of falling T guide slot, loosen outer stopper, after the spring kick-backs, the spring force is used in spacing head and outer stopper respectively, make outer stopper and interior stopper press from both sides tightly respectively on the top side lateral wall of cross slot in annular guide rail lateral surface and the shape of falling T guide slot, just so can fix interior stopper, and then fix the laser emitter of spacing post distal end. After two semicircle clamps I have been folded up and have been installed, at every turn when removing sliding support, outside pulling stopper can, and loosen the stopper outward, just can fix laser emission device's position, its simple structure, convenience simple to use.
As optimization, the outer stopper fit with a contraceptive ring be equipped with the round with the annular spacing groove of spacing post with the central line setting, annular spacing inslot cover is equipped with rather than normal running fit's rotation cover, the cover of rotation cover is provided with two pull rods as the line of symmetry with the central line of rotation cover on one's body, the pull rod extends the setting along the radial direction of rotation cover, the one end of pull rod is fixed and is sheathe in rotating, the protruding spherical bellying that is formed with of the other end, the diameter of spherical bellying is greater than the diameter of pull rod, the central point of spherical bellying is located the extension line of pull rod central line. When the outer limiting block is moved upwards, two fingers of an operator can be hooked on the rod bodies of the two pull rods respectively, force is applied conveniently, and meanwhile the fingers can be limited by the spherical convex parts.
As optimization, the outer limiting block is adhered with a friction rubber sheet facing the side face of one side of the annular guide rail, and a plurality of protrusions are formed on the surface of the friction rubber sheet in a protruding mode. And the friction force between the outer limiting block and the annular guide rail is increased, so that the laser emitting device is more stably fixed.
As optimization, spacing post just be located it stretch out in on the cylinder of outer stopper along spacing post central line direction extends and is provided with the external screw thread, wear to be equipped with the screw hole on the spacing head, the spacing head passes through the screw hole and is in the same place with external screw thread threaded connection, the spacing head can be followed external screw thread length direction removes in order to adjust the compression volume to fixed spring. After the spring is used for a long time, the spring deforms to a certain extent, the spring force is reduced, and the acting force of the outer limiting block is adjusted by adjusting the distance between the limiting sleeve and the outer limiting block.
In conclusion, the beneficial effects of the invention are as follows: the invention is convenient and quick to use, and the offset of the pipeline is judged according to the irradiated position of the laser light emitted by the laser emitting device at different positions.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a long-distance straight pipe connection deviation detection device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The method for detecting the connection deviation of the long-distance straight pipe in the specific embodiment comprises the following steps:
(1) a long-distance straight pipe pipeline connection deviation detection device is obtained, as shown in figure 1, the long-distance straight pipe pipeline connection deviation detection device comprises a front end measurement device and a rear end inspection device, the front end measurement device comprises a front annular fixing hoop formed by folding two semicircular hoops I1, the two semicircular hoops I1 are detachably connected together through a front fixing piece, the inner diameter of the front annular fixing hoop is consistent with the outer diameter of a pipeline to be detected, a semicircular guide rail 2 fixedly connected with the semicircular hoops I1 is formed on the outer side surface of the semicircular hoops I1 in an extending mode along the bending direction of the semicircular guide rail, when the two semicircular hoops I1 are folded, the two semicircular guide rails 2 can be folded to form an annular guide rail, the annular guide rail and the front annular fixing hoop are arranged at the same central line, the front end measurement device further comprises a sliding support, the sliding support is connected to the annular guide, the laser emitting device 3 can emit laser light rays in a direction parallel to the central line of the annular guide rail, the rear end inspection device comprises a rear annular fixed hoop formed by folding two semicircular hoops II 4, the two semicircular hoops II 4 are detachably connected together through a rear firmware, the inner diameter of the rear annular fixed hoop is consistent with the outer diameter of a pipeline to be inspected, a half side plate 5 fixedly connected with the semicircular hoops II 4 is formed on the outer side surface of the semicircular hoops II 4 in an extending mode along the bending direction of the semicircular hoops II 4, when the two semicircular hoops II 4 are folded, the two half side plates 5 can be spliced together to form a mapping plate, an annular scale line which is arranged with the rear annular fixed hoop on the same central line is carved on one side plate surface of the mapping plate, and the diameter of the annular scale line is consistent with the moving track diameter of the laser light rays emitted;
(2) the method comprises the following steps that a front end measuring device is installed at one end of a pipeline, when the pipeline is installed, a sliding support is installed on one semicircular guide rail 2, then the pipeline is wrapped in the two semicircular hoops I1, the two semicircular hoops I1 are folded and fixed together by using a front fixing piece, and a front annular fixing hoop is formed and sleeved on the pipeline;
(3) installing a rear end inspection device at the other end of the pipeline, wrapping the pipeline in the rear end inspection device by using two semicircular hoops II 4, enabling one side where the annular scale mark is located to face the direction of the front end measurement device, folding and fixing the two semicircular hoops II 4 together by using a rear fixing piece to form a rear annular fixed hoop sleeved on the pipeline;
(4) opening the laser emitting device 3, irradiating laser rays on the mapping plate, recording the position of the laser rays on the mapping plate, then moving the sliding support on the annular guide rail for a distance, recording the position of the laser rays on the mapping plate again, repeatedly moving the sliding support for multiple times, recording the irradiation position of the laser rays at each time, obtaining the irradiation position of the multiple laser rays on the mapping plate, then comparing the irradiation position with the position of the annular scale mark, if the irradiation positions are all overlapped with the annular scale mark, enabling the pipeline to have no offset, if the irradiation position deviates towards one side of the annular scale mark, enabling the pipeline to deviate, measuring the deviation size of the irradiation position and the position of the corresponding annular scale mark, and obtaining the deviation amount of the pipeline.
In the specific embodiment, the outer side surface of the annular guide rail is concavely provided with an inverted T-shaped guide groove which is arranged with the same central line as the annular guide rail, the sliding support comprises an inner limiting block which is arranged in a transverse groove in the inverted T-shaped guide groove and can do circular motion along the inverted T-shaped guide groove, a limiting column 6 is fixedly connected on the inner limiting block, the limiting column 6 extends along the radial direction of the annular guide rail, the limiting column penetrates through the notch of the inverted T-shaped guide groove and extends out of the inverted T-shaped guide groove, an outer limiting block 7 is arranged on a column body of the inverted T-shaped guide groove, the limiting column 6 penetrates through the outer limiting block 7, the outer limiting block 7 can be in sliding fit with the limiting column 6 along the length direction of the limiting column, a limiting head 8 is arranged on the column body of the limiting column 6 extending out of the outer limiting block 7, and a fixing spring 9 is sleeved on the limiting column 6 and positioned on, one end of a fixed spring 9 is abutted to the limiting head 8, the other end of the fixed spring is abutted to the outer limiting block 7, the fixed spring 9 can be abutted to the outer limiting block 7 and tightly abut to the outer side face of the annular guide rail and the inner limiting block is abutted to the inverted T-shaped guide groove and is located on the side wall of the top side of the transverse groove of the inverted T-shaped guide groove to provide spring force, and the laser emitting device 3 is fixedly connected to one end, far away from the inner limiting block, of the limiting column 6.
In this embodiment, outer stopper 7 fit with a contraceptive ring be equipped with the round with the annular spacing groove that spacing post 6 set up with the central line, annular spacing inslot cover is equipped with rather than normal running fit's rotation cover 10, the cover of rotating cover 10 is provided with two pull rods 11 as the line of symmetry with the central line that rotates cover 10 on one's body, pull rod 11 extends the setting along rotating cover 10 radial direction, the one end of pull rod 11 is fixed on rotating cover 10, the other end arch is formed with spherical bulge 12, the diameter of spherical bulge 12 is greater than the diameter of pull rod 11, the central point of spherical bulge 12 is located the extension line of pull rod 11 central line.
In this embodiment, outer stopper 7 is last and towards in it has the friction rubber skin to bond on one side of ring rail, and the protrusion is formed with a plurality of archs on the surface of friction rubber skin.
In this embodiment, spacing post 6 just be located it stretch out in follow on the cylinder of outer stopper 7 the extension of 6 central line directions of spacing post is provided with the external screw thread, wear to be equipped with the screw hole on the stopper 8, stopper 8 is in the same place through screw hole and external screw thread threaded connection, stopper 8 can be followed external screw thread length direction removes in order to adjust the compression volume to fixed spring.
In the specific implementation process, spacing post is kept away from the one end fixedly connected with bracket of interior stopper, laser emission device installs on the bracket, on spacing post and be close to the position cover of bracket be equipped with external screw thread fit's support ring is provided with many spinal branchs vaulting pole on the support ring, when the support ring moves soon in the bracket direction, the support ring was kept away from to the bracing piece one end in order to support it in the bracket below by the butt.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for detecting the connection offset of a long-distance straight pipe is characterized by comprising the following steps: the method comprises the following steps:
(1) the long-distance straight pipe pipeline connection deviation detection device comprises a front end measurement device and a rear end inspection device, wherein the front end measurement device comprises a front annular fixing hoop formed by folding two semicircular hoops I, the two semicircular hoops I are detachably connected together through a front fixing piece, the inner diameter of the front annular fixing hoop is consistent with the outer diameter of a pipeline to be detected, semicircular guide rails fixedly connected with the semicircular hoops I are formed on the outer side surfaces of the semicircular hoops I in an extending mode along the bending direction of the semicircular hoops I, when the two semicircular hoops I are folded, the two semicircular guide rails can be folded to form an annular guide rail, the annular guide rail and the front annular fixing hoop are arranged on the same center line, the front end measurement device further comprises a sliding support, the sliding support is connected to the annular guide rail in a sliding mode so as to move circumferentially along the annular guide rail, a laser emission device is installed on the sliding support, and the laser, the rear end inspection device comprises a rear annular fixing hoop formed by folding two semicircular hoops II, the two semicircular hoops II are detachably connected together through a rear firmware, the inner diameter of the rear annular fixing hoop is consistent with the outer diameter of a pipeline to be detected, a half side plate fixedly connected with the semicircular hoops II is formed on the outer side surface of the semicircular hoops II along the bending direction of the semicircular hoops II in an extending mode, when the two semicircular hoops II are folded, the two half side plates can be spliced together to form a mapping plate, an annular scale mark which is arranged with the rear annular fixing hoop on the same center line is carved on the surface of one side of the mapping plate, and the diameter of the annular scale mark is consistent with the moving track diameter of laser light emitted by a laser emitting device moving around the annular;
the outer side surface of the annular guide rail is concavely provided with an inverted T-shaped guide groove which is arranged along the same central line as the annular guide rail, the sliding support comprises an inner limiting block which is arranged in a transverse groove in the inverted T-shaped guide groove and can move circularly along the inverted T-shaped guide groove, a limiting post is fixedly connected to the inner limiting block and extends along the radial direction of the annular guide rail, the limiting post penetrates through the notch of the inverted T-shaped guide groove and extends out of the inverted T-shaped guide groove, an outer limiting block is arranged on a cylinder of the inverted T-shaped guide groove, the limiting post penetrates through the outer limiting block and can be in sliding fit with the outer limiting block along the length direction of the limiting post, a limiting head is arranged on the cylinder of the limiting post extending out of the outer limiting block, a fixing spring is sleeved on the cylinder of the limiting post and positioned between the limiting head and the outer limiting block, one end of the fixing spring is abutted to the limiting head, the fixed spring can provide spring force for the outer limiting block to abut against the outer side face of the annular guide rail and the inner limiting block to abut against the inverted T-shaped guide groove and be positioned on the side wall of the top side of the transverse groove of the inverted T-shaped guide groove, and the laser emitting device is fixedly connected to one end, away from the inner limiting block, of the limiting column;
(2) the method comprises the following steps that a front end measuring device is installed at one end of a pipeline, when the pipeline is installed, a sliding support is installed on one semicircular guide rail, then the pipeline is wrapped in two semicircular hoops I, the two semicircular hoops I are folded and fixed together by using a front fixing piece, and a front annular fixing hoop is formed and sleeved on the pipeline;
(3) installing a rear end inspection device at the other end of the pipeline, wrapping the pipeline in the rear end inspection device by using two semicircular hoops II, enabling one side where the annular scale mark is located to face the direction of the front end measurement device, folding and fixing the two semicircular hoops II together by using a rear fixing piece to form a rear annular fixed hoop sleeved on the pipeline;
(4) opening a laser emitting device, irradiating laser rays on a mapping plate, recording the position of the laser rays on the mapping plate, moving a sliding support on an annular guide rail for a distance, recording the position of the laser rays on the mapping plate again, repeatedly moving the sliding support for multiple times, recording the irradiation position of each laser ray, obtaining the irradiation position of the multiple laser rays on the mapping plate, comparing the irradiation position with the position of an annular scale mark, if the irradiation positions are overlapped with the annular scale mark, enabling the pipeline to have no offset, if the irradiation position deviates towards one side of the annular scale mark, enabling the pipeline to deviate, measuring the deviation size of the irradiation position and the position of the corresponding annular scale mark, and obtaining the deviation amount of the pipeline.
2. The method for detecting the connection deviation of the long-distance straight pipe according to claim 1, wherein: the outer stopper fit with a contraceptive ring be equipped with the round with the annular spacing groove of spacing post with the central line setting, annular spacing inslot cover is equipped with rather than normal running fit's rotation cover, the cover of rotation cover is provided with two pull rods as the line of symmetry with the central line of rotation cover on one's body, the pull rod extends the setting along the radial direction of rotation cover, the one end of pull rod is fixed and is sheathe in rotating, the protruding spherical bellying that is formed with of the other end, the diameter of spherical bellying is greater than the diameter of pull rod, the central point of spherical bellying is located the extension line of pull rod central line.
3. The method for detecting the connection deviation of the long-distance straight pipe according to claim 1, wherein: the outer limiting block is provided with a friction rubber sheet which is bonded on the side face of one side of the annular guide rail and faces the annular guide rail, and a plurality of bulges are formed on the surface of the friction rubber sheet in a protruding mode.
4. The method for detecting the connection deviation of the long-distance straight pipe according to claim 1, wherein: spacing post just is located it stretch out in follow on the cylinder of outer stopper spacing post central line direction extends and is provided with the external screw thread, threaded hole is worn to be equipped with on the spacing head, the spacing head passes through threaded hole and external screw thread threaded connection together, the spacing head can be followed external screw thread length direction removes in order to adjust the compression capacity to fixed spring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910918419.8A CN110470249B (en) | 2019-09-26 | 2019-09-26 | Method for detecting connection offset of long-distance straight pipe |
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| CN201910918419.8A CN110470249B (en) | 2019-09-26 | 2019-09-26 | Method for detecting connection offset of long-distance straight pipe |
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| CN110470249B true CN110470249B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4747454A (en) * | 1986-05-12 | 1988-05-31 | Perryman J Philip | External axis parallel alignment system |
| CN2034264U (en) * | 1988-10-20 | 1989-03-15 | 北京红旗机械厂 | Coaxiality measuring apparatus |
| CN2245761Y (en) * | 1995-10-06 | 1997-01-22 | 北京三众工贸有限责任公司 | Machine shaft alignement instrument |
| DE102004011404A1 (en) * | 2004-03-05 | 2005-09-22 | Prüftechnik Dieter Busch AG | Measuring device for the determination of the straightness of waves or shaft tunnels |
| CN202267463U (en) * | 2011-10-15 | 2012-06-06 | 弭道彬 | Coaxiality testing fixture |
| CN204963814U (en) * | 2015-08-12 | 2016-01-13 | 中石化宁波工程有限公司 | Straightness accuracy measuring apparatu |
| CN205981143U (en) * | 2016-07-26 | 2017-02-22 | 南京三方化工设备监理有限公司 | Tower straightness accuracy measuring tool |
| CN206683594U (en) * | 2017-04-27 | 2017-11-28 | 南京扬子石化工程监理有限责任公司 | A kind of scaffold testing apparatus for verticality |
| CN107727006A (en) * | 2017-08-04 | 2018-02-23 | 江苏亘德科技有限公司 | A kind of bearing centralising device |
| CN208520330U (en) * | 2018-08-15 | 2019-02-19 | 湖北钟格塑料管有限公司 | Plastic pipe length control device |
| CN109570895A (en) * | 2018-12-27 | 2019-04-05 | 广东省工业设备安装有限公司 | A kind of pipeline alignment and fixation device |
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