CN207797985U - A kind of pipe detection component - Google Patents
A kind of pipe detection component Download PDFInfo
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- CN207797985U CN207797985U CN201721699814.4U CN201721699814U CN207797985U CN 207797985 U CN207797985 U CN 207797985U CN 201721699814 U CN201721699814 U CN 201721699814U CN 207797985 U CN207797985 U CN 207797985U
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Abstract
The utility model discloses a kind of pipe detection components, belong to pipeline welding technical field.The pipe detection includes：Outer detection ruler, the outer detection ruler have intrados, the intrados can with the outer wall of undeformed pipeline to be detected paste and.The utility model realizes during whether detection pipeline opening deforms, and it is not necessary that the pipe detection component to be aligned with the center of circle of pipeline opening, this improves the detection precisions of pipeline opening.The utility model is for detecting whether pipeline opening deforms.
Description
Technical field
The utility model is related to pipeline welding technical field, more particularly to a kind of pipe detection component.
Background technology
In pipeline construction, when loading and unloading and transporting steel pipe, pipeline opening is easy collide and to be squeezed and deformed, in order to avoid
The welding quality of pipeline is influenced because pipeline opening deforms, staff would generally detect whether pipeline opening becomes before welded pipe line
Shape.
In the related technology, when whether detection pipeline opening deforms, staff would generally measure pipeline opening using tape measure
The outer diameter and internal diameter of one week each position.Later, staff can compare the internal diameter and the pipeline of each position of pipeline opening
Whether normal inner diameter is consistent, and whether the outer diameter of each position is consistent with the nominal outer diameter of the pipeline, if a certain position
Internal diameter is not inconsistent with normal inner diameter or the outer diameter of the position is not inconsistent with nominal outer diameter, then illustrates that pipeline opening deforms in the position.
During using tape measure pipeline opening internal-and external diameter, due to the more difficult alignment in the center of circle of pipeline opening, use
Usually there is error in the internal-and external diameter that tape measure goes out, relatively low so as to cause the detection precision of pipeline opening.
Utility model content
This application provides a kind of pipe detection components.The detection precision that can solve pipeline opening in the related technology is relatively low
The problem of, the technical solution is as follows：
On the one hand, a kind of pipe detection component is provided, the pipe detection component includes：Outer detection ruler, the outer detection
Ruler have intrados, the intrados can with the outer wall of undeformed pipeline to be detected paste and.
Optionally, the pipe detection component further includes：Interior detection ruler, the interior detection ruler has extrados, described outer
Cambered surface can be bonded with the inner wall of the undeformed pipeline to be detected.
Optionally, the pipe detection component further includes：Wedge structure.
Optionally, the described one end of outer detection ruler far from the intrados is provided with the first in command, and the interior detection ruler is remote
One end from the extrados is provided with second handle.
Optionally, the described one end of outer detection ruler far from the intrados is provided with the first protrusion, in first protrusion
It is provided with first through hole, and the inner wall of the first through hole is the curved surface being bent to the direction far from the first through hole center,
First protrusion and the first through hole form the first in command；
The described one end of interior detection ruler far from the extrados is provided with the second protrusion, and the is provided in second protrusion
Two through-holes, and the curved surface that the inner wall of second through-hole is the direction bending to separate second through-hole center, described second
Raised and described second through-hole forms the second handle.
Optionally, the first through hole and second through-hole are slotted eye.
Optionally, thickness of the outer detection ruler close to one end of the intrados is less than one end far from the intrados
Thickness；The interior detection ruler is less than the thickness of one end far from the extrados close to the thickness of one end of the extrados.
Optionally, the pipe detection component further includes：Multiple first magnetic structures, multiple first supports, multiple second
Magnetic structure and multiple second supports,
The multiple first magnetic structure is corresponded with the multiple first support, and each first magnetic structure is logical
It crosses its corresponding described first support to be fixed on the outer detection ruler, close to the inner arc on each first magnetic structure
The surface in face is concordant with the intrados, and the multiple first magnetic structure is described to be checked for the outer detection ruler to be fixed on
The outer wall in test tube road；
The multiple second magnetic structure is corresponded with the multiple second support, and each second magnetic structure is logical
It crosses its corresponding described second support to be fixed on the interior detection ruler, close to the outer arc on each second magnetic structure
The surface in face is concordant with the extrados, and the multiple second magnetic structure is described to be checked for the interior detection ruler to be fixed on
The inner wall in test tube road.
Optionally, the wedge structure is wedge-shaped feeler gauge, and the upper bottom surface of the wedge-shaped feeler gauge is labeled at least one quarter
Degree；First scale is any scale at least one scale, and first scale is labeled in the first of the upper bottom surface
Position, first scale is corresponding to be worth for the first position in the short transverse of the wedge-shaped feeler gauge and the wedge plug
The distance of the bottom surface of ruler.
Optionally, the precision of the wedge-shaped feeler gauge is 0.1 millimeter.
Technical solution provided by the present application can include the following benefits：In pipe detection group provided by the utility model
In part, since the intrados of outer detection ruler can be bonded with the outer wall of undeformed pipeline to be detected.Therefore, the pipeline is being used
When detection components detect pipeline opening to be detected, the intrados of outer detection ruler can be close to outside pipeline opening to be detected by staff
Wall, and check and whether combine closely between intrados and pipeline outer wall, so as to learn whether pipeline opening deforms.And due to
During whether detection pipeline opening deforms, it is not necessary that the pipe detection component to be aligned with the center of circle of pipeline opening, therefore, carry
The high detection precision of pipeline opening.
It should be understood that above general description and following detailed description is merely exemplary, this can not be limited
Utility model.
Description of the drawings
It, below will be to attached needed in embodiment description in order to illustrate more clearly of the embodiments of the present invention
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, for this
For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of front view for pipe detection component that the utility model embodiment provides；
Fig. 2 is the front view for another pipe detection component that the utility model embodiment provides；
Fig. 3 is a kind of side sectional view for pipe detection component that the utility model embodiment provides；
Fig. 4 is the front view for another pipe detection component that the utility model embodiment provides；
Fig. 5 is a kind of front view for wedge-shaped feeler gauge that the utility model embodiment provides；
Fig. 6 is a kind of vertical view for wedge-shaped feeler gauge that the utility model embodiment provides.
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets the utility model
Embodiment, and for explaining the principles of the present invention together with specification.
Specific implementation mode
In order to keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing to this practicality
It is novel to be described in further detail, it is clear that described embodiment is only the utility model some embodiments, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work
Under the premise of all other embodiment for being obtained, shall fall within the protection scope of the present invention.
The application of pipeline is very universal, and before using pipeline, staff, which would generally use tape measure to detect pipeline opening, is
No deformation, when using tape measure pipeline opening internal-and external diameter, due to the more difficult alignment in the pipeline opening center of circle, the detection essence of pipeline opening
Accuracy is relatively low.In addition, due to when using tape measure pipeline opening internal diameter or outer diameter every time, by reading the scale on tape measure
Determine the internal diameter or outer diameter at a certain position of pipeline opening, and the internal diameter or outer at the other positions being unable to measure around the position
Therefore diameter can not detect whether the multiple positions of pipeline opening have occurred deformation simultaneously using tape measure every time.The use of the new type embodiment
A kind of pipe detection component is provided, can solve the problems, such as that the accuracy of detection of pipeline opening is relatively low, and can realize while examine
Whether multiple positions at test tube road junction deform upon.
Fig. 1 is a kind of front view for pipe detection component that the utility model embodiment provides.As shown in Figure 1, the pipeline
Detection components may include：Outer detection ruler 10, the outer detection ruler 10 have intrados 101, the intrados 101 can with it is not deformed
Pipeline to be detected outer wall patch and.
In conclusion in pipe detection component provided by the utility model, since the intrados of outer detection ruler can be with
The outer wall of undeformed pipeline to be detected is bonded.Therefore, in pipeline opening to be detected using the pipe detection component detection, work
The intrados of outer detection ruler can be close to pipeline opening outer wall to be detected by personnel, and check between intrados and pipeline outer wall whether
It combines closely, so as to learn whether pipeline opening deforms.And since during whether detection pipeline opening deforms, being not necessarily to will
The pipe detection component is aligned with the center of circle of pipeline opening, and this improves the detection precisions of pipeline opening.
Also, since the intrados of outer detection ruler is larger, in the process for detecting the pipeline opening every time and whether deforming
In, which can contact with multiple positions in pipeline opening, and whether multiple positions to detect pipeline opening deform.
Fig. 2 is the front view for another pipe detection component that the utility model embodiment provides, and Fig. 3 is the utility model
A kind of side sectional view for pipe detection component that embodiment provides.Incorporated by reference to Fig. 2 and Fig. 3, which can be with
Including：Interior detection ruler 20, the interior detection ruler 20 have extrados 201, which can be with undeformed pipeline to be detected
Inner wall fitting.
Fig. 4 is the front view for another pipe detection component that the utility model embodiment provides, on the basis of Fig. 2,
As shown in figure 4, the pipe detection component can also include：Wedge structure 30.
During detecting some position of pipeline opening to be detected using the conduit assembly, staff can be by the wedge shape
The relatively thin one end of structure 30 is inserted between intrados 101 and pipeline opening outer wall to be detected, or by the wedge structure 30 it is relatively thin one
End is inserted between extrados 201 and pipeline opening outer wall to be detected.If extrados can be inserted in the relatively thin one end of the wedge structure 30
Between 201 and pipeline opening outer wall to be detected, then illustrate that pipeline opening to be detected deforms in the position.If the wedge structure 30 compared with
Thin one end can not be inserted between extrados 201 and pipeline opening outer wall to be detected, then illustrate pipeline opening to be detected in the position not
It deforms.
Continuing with Fig. 2 and Fig. 3 is combined, the one end of outer detection ruler 10 far from intrados 101 can be provided with the first in command
102, the one end of interior detection ruler 20 far from extrados 201 can be provided with second handle 202.Staff can be by holding the
Leader 102 operates interior detection ruler 20 to operate outer detection ruler 10, and by holding second handle 202, improves detection
The operation convenience of ruler.
Optionally, the one end of outer detection ruler 10 far from intrados 101 is provided with the first protrusion 102A, and the first protrusion 102A
On be provided with first through hole 102B, and the inner wall of first through hole 102B is to be bent to the direction far from the centers first through hole 102B
Curved surface C1, the first protrusion 102A and first through hole 102B form the first in command 102.Interior detection ruler 20 far from extrados 201 one
End, which is provided on the second protrusion 202A, the second protrusion 202A, is provided with the second through-hole 202B, and the inner wall of the second through-hole 202B is
The curved surface C2, the second protrusion 202A and the second through-hole 202B compositions being bent to the direction far from the second centers through-hole 202B are second
Hand 202.
It is the curved surface C1 being bent to the direction at the center far from first through hole 201B in the inner wall of first through hole 102B, and the
When the inner wall of two through-hole 202B is the curved surface C2 being bent to the direction far from the second centers through-hole 202B, held since curved surface is more convenient
It holds, therefore further improves the operation convenience of detection ruler.
Optionally, first through hole 102B and the second through-hole 202B is slotted eye.In practical application, first through hole and
Two through-holes can also be the hole of other shapes, and such as rectangular opening or round hole, the utility model embodiment is not construed as limiting this.
Optionally, outer detection ruler 10 is less than one end A2 far from intrados 101 close to the thickness of one end A1 of intrados 101
Thickness, interior detection ruler 20 is less than the thickness of one end B2 far from extrados 201 close to the thickness of one end B1 of extrados 201.
That is to say, outer detection ruler 10 close to one end A1 of intrados 101 thickness and interior detection ruler 20 close to extrados
The thickness of 201 one end B1 is smaller, when whether detection pipeline opening deforms upon, the contact of the intrados and pipeline opening outer wall
Area is smaller, and the contact area of extrados and pipeline opening inner wall is smaller.Therefore, outer detection ruler and interior detection ruler can be accurate
Whether each position deforms upon in detection pipeline opening, and the precision of the outer detection ruler and interior detection ruler is higher.
Optionally, pipe detection component can also include：It is multiple first magnetic structures 40, multiple first supports 50, multiple
Second magnetic structure 60 and multiple second supports 70.Wherein, multiple first magnetic structures 40 and multiple first supports 50 are one by one
Corresponding, each first magnetic structure 40 is fixed on by its corresponding first support 50 on outer detection ruler, each first magnetic knot
Surface 401 on structure 40 close to intrados is concordant with intrados 101.Multiple first magnetic structures 40 are for consolidating outer detection ruler 10
It is scheduled on the outer wall of pipeline to be detected.
Exemplary, the first magnetic structure of a part 40 in multiple first magnetic structures 40 is fixed on outer detection ruler 10 far
One end from the first in command 102, the first magnetic structure of another part 40 in multiple first magnetic structures 40 are fixed on outer detection
The other end far from the first in command 102 on ruler 10.And first magnetic structure 40, first support 50 and outer detection ruler 10 can lead to
It crosses bolt L1 to connect with nut L2, the first magnetic structure 40 can be connected with first support 50 by screw L3.It needs to illustrate
It includes two first supports 50 with pipe detection component in the utility model embodiment to be and two the first magnetic structures 40 are
, in practical application, the number of first support 50 and the first magnetic structure 40 can also be other numerical value (such as first supports 50
And first the number of magnetic mechanism 40 be three), the utility model embodiment is not construed as limiting this.
In addition, multiple second magnetic structures 60 are corresponded with multiple second supports 70, each second magnetic structure 60 is logical
It crosses its corresponding second support 70 to be fixed on interior detection ruler 20, close to the table of extrados 201 on each second magnetic structure 60
Face 601 is concordant with extrados 201, and multiple second magnetic structures 60 are for interior detection ruler 20 to be fixed in pipeline to be detected
Wall.
Exemplary, the second magnetic structure of a part 60 in multiple second magnetic structures 60 is fixed on interior detection ruler 20 far
One end from second handle 202, the second magnetic structure of another part 60 in multiple second magnetic structures 60 are fixed on outer detection
The other end far from second handle 202 on ruler 20.And second magnetic structure 60, second support 70 and outer detection ruler 20 can lead to
It crosses bolt L1 to connect with nut L2, the second magnetic structure 60 can be connected with first support 70 by screw L3.It needs to illustrate
It includes two second supports 70 with pipe detection component in the utility model embodiment to be and two the second magnetic structures 60 are
, in practical application, the number of second support 70 and the second magnetic structure 60 can also be other numerical value (such as second supports 70
And second the number of magnetic mechanism 60 be three), the utility model embodiment is not construed as limiting this.
It include multiple first magnetic structures 40 and multiple second magnetic mechanism 60 in pipe detection component, and test tube to be checked
Under the premise of the material at road junction is magnetic material.Staff using the pipe detection component detection pipeline opening when, due to
First magnetic structure 40 and the second magnetic structure 60 have magnetic effect to magnetic material, because detection ruler 10 can be adsorbed in addition
On the pipeline opening outer wall, and interior detection ruler 20 can be adsorbed on the pipeline opening inner wall.Allow staff simultaneously to this
The outer wall and inner wall of pipeline opening are detected, and further improve the detection efficiency of pipeline opening.
Fig. 5 is a kind of front view for wedge-shaped feeler gauge that the utility model embodiment provides, and Fig. 6 is the utility model embodiment
A kind of vertical view of the wedge-shaped feeler gauge provided, which can be wedge structure 30 shown in Fig. 4.Incorporated by reference to Fig. 5 and figure
6, the upper bottom surface C3 of the wedge-shaped feeler gauge 30 is labeled at least one scale.As shown in fig. 6, can be scored on the wedge-shaped feeler gauge 30
Multiple scales, it is exemplary, 60 scales are scored in Fig. 6 altogether.
It should be noted that each scale can correspond to the magnitude represented by a value namely the scale.It is exemplary,
First scale M1 is any scale at least one scale, and the first scale M1 is labeled in the first position L1 of upper bottom surface, first
The corresponding values of scale M1 in the short transverse H of wedge-shaped feeler gauge 30 the bottom surface C4 of first position L1 and wedge-shaped feeler gauge 30 away from
From P1.
Exemplary, the corresponding absolute value of the difference for being worth value corresponding with adjacent scale of each scale can be 0.1 milli in Fig. 6
Rice (namely the precision of the wedge-shaped feeler gauge 30 is 0.1 millimeter).The corresponding value of 10th scale is 1 millimeter, and the 20th scale corresponds to
Value be 2 millimeters, the 30th scale it is corresponding value be 3 millimeters, the 40th scale it is corresponding value be 4 millimeters, the 50th scale pair
The value answered is 5 millimeters, and the corresponding value of the 60th scale is 6 millimeters.
It should be noted that with the precision of the wedge-shaped feeler gauge 30 for 0.1 millimeter in the utility model embodiment, and the wedge
It is labeled on shape clearance gauge for 60 scales.In practical application, the precision of the wedge-shaped feeler gauge 30 can also be other numerical value, such as
0.05 millimeter, the scale number marked on wedge-shaped feeler gauge can also be other numerical value, such as 50, the utility model embodiment to this not
It is construed as limiting.
During using pipe detection component provided by the utility model, it whether there is detecting pipeline opening to be detected
When outer deformation, staff can hold the first in command of outer detection ruler, and intrados in the outer detection ruler is tightly attached to pipeline
The relatively thin one end of wedge-shaped feeler gauge is inserted between intrados and pipeline opening outer wall by a certain position of mouth outer wall later.If the wedge plug
Ruler can not be inserted into, then illustrate that intrados and pipeline opening outer wall are combined closely, further relate to pipeline opening outer wall and do not occur in the position
Deformation.If the wedge-shaped feeler gauge can be inserted, illustrate that there are gaps between intrados and pipeline opening outer wall, further relate to pipeline opening
Outer wall deforms in the position, at this point, staff can learn pipeline opening outer wall at this by the reading of wedge-shaped feeler gauge
The deflection of position.
Behind the detection end conduit mouth outer wall position, staff can take away the outer detection ruler from the position, and can be with
Intrados in the outer detection ruler is tightly attached to pipeline opening outer wall other positions, and the pipeline opening outer wall other positions are examined
It surveys.
When detecting pipeline opening to be detected with the presence or absence of interior deformation, staff can hold the second of interior detection ruler
Hand, and extrados in the interior detection ruler is tightly attached to a certain position of pipeline opening inner wall, later by the relatively thin one end of wedge-shaped feeler gauge
It is inserted between extrados and pipeline opening inner wall.If the wedge-shaped feeler gauge can not be inserted into, illustrate that extrados and pipeline opening inner wall are close
In conjunction with further relating to pipeline opening and do not deform in the position.If the wedge-shaped feeler gauge can be inserted, illustrate extrados and pipeline
There are gaps between mouth inner wall, further relate to pipeline opening inner wall and deform in the position, at this point, staff can pass through wedge
Shape clearance gauge reads to learn the deflection of pipeline opening inner wall in the position.
Behind the detection end conduit mouth inner wall position, staff can take away the interior detection ruler from the position, and should
Extrados is tightly attached to pipeline opening inner wall other positions in interior detection ruler, and is detected to the pipeline opening inner wall other positions.
In conclusion in pipe detection component provided by the utility model, since the intrados of outer detection ruler can be with
The outer wall of undeformed pipeline to be detected is bonded, and the extrados of interior detection ruler can be with the inner wall of undeformed pipeline to be detected
Note is bonded.Therefore, when using pipe detection component detection pipeline opening to be detected, staff can will be in outer detection ruler
Whether cambered surface is close to pipeline opening outer wall to be detected, and check and combine closely between intrados and pipeline opening outer wall, and by interior inspection
Whether the extrados of measurement ruler is tightly attached to pipeline opening inner wall, and check and combine closely between extrados and pipeline outer wall, so as to
Learn whether pipeline opening deforms.And due to detect pipeline opening whether deform during, without by the pipe detection component with
The center of circle of pipeline opening is aligned, and this improves the detection precisions of pipeline opening.
Those skilled in the art will readily occur to this practicality after considering specification and putting into practice utility model disclosed herein
Novel other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these
Variations, uses, or adaptations follow the general principle of the utility model and include undocumented skill of the utility model
Common knowledge in art field or conventional techniques.The description and examples are only to be considered as illustrative, the utility model
True scope and spirit are pointed out by claim.
It should be understood that the utility model is not limited to the accurate knot for being described above and being shown in the accompanying drawings
Structure, and various modifications and changes may be made without departing from the scope thereof.The scope of the utility model is only wanted by appended right
It asks to limit.
Claims (10)
1. a kind of pipe detection component, which is characterized in that the pipe detection component includes：Outer detection ruler,
The outer detection ruler have intrados, the intrados can with the outer wall of undeformed pipeline to be detected paste and, it is described
The one end of outer detection ruler far from the intrados is provided with the first in command.
2. pipe detection component according to claim 1, which is characterized in that the pipe detection component further includes：Interior inspection
Measurement ruler,
There is the interior detection ruler extrados, the extrados can be bonded with the inner wall of the undeformed pipeline to be detected.
3. pipe detection component according to claim 1 or 2, which is characterized in that the pipe detection component further includes：Wedge
Shape structure.
4. pipe detection component according to claim 2, which is characterized in that
The described one end of interior detection ruler far from the extrados is provided with second handle.
5. pipe detection component according to claim 4, which is characterized in that
The described one end of outer detection ruler far from the intrados is provided with the first protrusion, and it is logical to be provided with first in first protrusion
Hole, and the inner wall of the first through hole is the curved surface being bent to the direction far from the first through hole center, first protrusion
The first in command is formed with the first through hole；
The described one end of interior detection ruler far from the extrados is provided with the second protrusion, and it is logical to be provided with second in second protrusion
Hole, and the inner wall of second through-hole is the curved surface being bent to the direction far from second through-hole center, second protrusion
The second handle is formed with second through-hole.
6. pipe detection component according to claim 5, which is characterized in that
The first through hole and second through-hole are slotted eye.
7. pipe detection component according to claim 2, which is characterized in that
The outer detection ruler is less than the thickness of one end far from the intrados close to the thickness of one end of the intrados；It is described
Interior detection ruler is less than the thickness of one end far from the extrados close to the thickness of one end of the extrados.
8. pipe detection component according to claim 2, which is characterized in that the pipe detection component further includes：It is multiple
First magnetic structure, multiple first supports, multiple second magnetic structures and multiple second supports,
The multiple first magnetic structure is corresponded with the multiple first support, and each first magnetic structure passes through it
The corresponding first support is fixed on the outer detection ruler, close to the intrados on each first magnetic structure
Surface is concordant with the intrados, and the multiple first magnetic structure is used to the outer detection ruler being fixed on the test tube to be checked
The outer wall in road；
The multiple second magnetic structure is corresponded with the multiple second support, and each second magnetic structure passes through it
The corresponding second support is fixed on the interior detection ruler, close to the extrados on each second magnetic structure
Surface is concordant with the extrados, and the multiple second magnetic structure is used to the interior detection ruler being fixed on the test tube to be checked
The inner wall in road.
9. pipe detection component according to claim 3, which is characterized in that
The wedge structure is wedge-shaped feeler gauge, and the upper bottom surface of the wedge-shaped feeler gauge is labeled at least one scale；
First scale is any scale at least one scale, and first scale is labeled in the first of the upper bottom surface
Position, first scale is corresponding to be worth for the first position in the short transverse of the wedge-shaped feeler gauge and the wedge plug
The distance of the bottom surface of ruler.
10. pipe detection component according to claim 9, which is characterized in that
The precision of the wedge-shaped feeler gauge is 0.1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721699814.4U CN207797985U (en) | 2017-12-08 | 2017-12-08 | A kind of pipe detection component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721699814.4U CN207797985U (en) | 2017-12-08 | 2017-12-08 | A kind of pipe detection component |
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| Publication Number | Publication Date |
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| CN207797985U true CN207797985U (en) | 2018-08-31 |
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ID=63283461
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721699814.4U Active CN207797985U (en) | 2017-12-08 | 2017-12-08 | A kind of pipe detection component |
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| Country | Link |
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| CN (1) | CN207797985U (en) |
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2017
- 2017-12-08 CN CN201721699814.4U patent/CN207797985U/en active Active
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