CN209539282U - Connection centralizer for measuring instrument - Google Patents
Connection centralizer for measuring instrument Download PDFInfo
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- CN209539282U CN209539282U CN201822064576.0U CN201822064576U CN209539282U CN 209539282 U CN209539282 U CN 209539282U CN 201822064576 U CN201822064576 U CN 201822064576U CN 209539282 U CN209539282 U CN 209539282U
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- positive cover
- supporting positive
- housing
- flexible shaft
- connection
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Abstract
The utility model provides a kind of connection centralizer for measuring instrument.Connection centralizer for measuring instrument includes: flexible shaft；The more piece supporting positive cover set gradually along the axial direction of the flexible shaft, the supporting positive cover is set in the outside of the flexible shaft, and the surface of supporting positive cover described in an at least section towards the flexible shaft side has flexible layer.The utility model solves the problems, such as that connection centralizer rigidity is excessive in the prior art, damping effect is poor to protect connected component.
Description
Technical field
The utility model relates to oil-well drilling equipment fields, help in particular to a kind of connection for measuring instrument
Positive device.
Background technique
In petroleum drilling engineering, directed drilling is using more and more extensive.Wireless drilling measuring system is exactly in drilling well
Cheng Zhong, by the data transmission of downhole instrument measurement to ground.Cable is not used, but flowing in drilling tool is changed by control
Mud pressure is realized.Wireless drilling inclinometers are the important tools for being oriented drilling well, because its performance is stable, high reliablity its
Demand is increasing.
Wireless drilling inclinometers are made of ground installation and device for subsurface measuring two parts.Device for subsurface measuring is mainly by fixed
To compositions such as inserting tube, gamma inserting tube, mud pulse generator, battery, connection centralizer, fishing heads.Centralizer is connected this its
Mechanically and electrically device connects for middle offer, surveys the important composition portion that connection centralizer used in instrument is measuring instrument in wireless drilling
Point.
Device for subsurface measuring is mounted on inside non magnetic drill collar, since non magnetic drill collar can occur bending and deformation in underground, underground
Measuring instrument will also occur bending and deformation.When build angle rate is relatively high, the deformation of device for subsurface measuring is enough to cause itself to damage.
And in the prior art, the rigidity that some connects centralizer is big as the rigidity of the resistance to compression cylinder connected, some connection rightings
The rigidity of device is greater than the rigidity of connected resistance to compression cylinder, so moderate finite deformation readily occurs for the measurement pipe nipple of the inside of resistance to compression cylinder
And it damages.Therefore, it is excessive that connection centralizer rigidity exists in the prior art, thus the problem of connected component can not be protected.
There is also the problems of Aseismatic Design difference for existing centralizer, cannot protect connected component.
Utility model content
The main purpose of the utility model is to provide a kind of connection centralizers for measuring instrument, to solve existing skill
Connected in art centralizer rigidity is excessive, damping effect it is poor to which connected component can not be protected the problem of.
To achieve the goals above, one aspect according to the present utility model provides a kind of company for measuring instrument
Connect centralizer, comprising: flexible shaft；The more piece supporting positive cover set gradually along the axial direction of flexible shaft, supporting positive cover are set in flexible shaft
Outside, and the surface of an at least section supporting positive cover towards flexible shaft side has flexible layer.
Further, flexible layer is rubber layer.
Further, an at least section supporting positive cover includes: housing, has axially extending long hole on the side wall of housing, and long
Hole be it is multiple, multiple long holes are provided at circumferentially spaced along housing；Inner sleeve, inner sleeve is embedded in housing and has stretches out across long hole
Fin structure, inner sleeve is located at the part in housing as flexible layer.
Further, fin structure is located at the integrated molding of the part in housing with inner sleeve and material is identical.
Further, more piece supporting positive cover includes sequentially connected first supporting positive cover, the second supporting positive cover and third supporting positive cover, and
Second supporting positive cover includes inner sleeve and housing.
Further, the housing of the first supporting positive cover, third supporting positive cover and the second supporting positive cover is made of metal material.
Further, housing has the first fitting flange towards one end of the first supporting positive cover, and the first fitting flange is towards the
One supporting positive cover is stretched out and is connected on the end face of the first supporting positive cover, so that the end face of the end face of the first supporting positive cover and the second supporting positive cover
Between generate the first fit-up gap；And/or housing has the second fitting flange towards one end of third supporting positive cover, the second assembly is convex
Edge is stretched out towards third supporting positive cover and is connected on the end face of third supporting positive cover, so that the end face of third supporting positive cover and the second righting
The second fit-up gap is generated between the end face of set.
Further, the both ends of corresponding second supporting positive cover of flexible shaft are formed with step structure, between two adjacent sections supporting positive cover
It is provided with gasket, gasket is pressed together at step structure.
Further, flexible shaft has multiple receiving annular grooves towards the surface of supporting positive cover, and multiple receiving annular grooves are along flexible
The axially spaced-apart of axis is arranged, and connection centralizer further includes multiple first sealing rings, and multiple first sealing rings are arranged in a one-to-one correspondence
In multiple receiving annular grooves.
Further, centralizer is connected further include: the first end of more piece supporting positive cover is arranged in multi-core socket, multi-core socket；
The second end of more piece supporting positive cover is arranged in dampening assembly, dampening assembly；Inserting tube hanging head component, inserting tube hanging head component are arranged in damping
The one end of component far from more piece supporting positive cover；Micro- rectangular receptacle, micro- rectangular receptacle are arranged in inserting tube hanging head component.
Using the technical solution of the utility model, the connection centralizer for measuring instrument in the application includes flexible shaft
The more piece supporting positive cover set gradually with the axial direction along flexible shaft.Supporting positive cover is set in the outside of flexible shaft, and an at least section righting
Covering towards the surface of flexible shaft side has flexible layer.
Using above structure the connection centralizer for measuring instrument when, since the axis that uses of connection centralizer is flexible
Axis, so centralizer assumes responsibility for main deformation when measuring instrument deforms.When centralizer is shaken, flexible shaft
Can deformation occurs and absorbs the vibration that centralizer is subject to, guaranteeing connection and the case where righting so as to make to connect centralizer
Under the component connected is protected.Since supporting positive cover is set in the outside of flexible shaft, so in the process of centralizer work
Middle supporting positive cover can play a protective role to flexible shaft, prevent flexible shaft rupture failure.Again due to an at least section supporting positive cover direction
The surface of flexible shaft side has flexible layer, so when centralizer is shaken, flexible layer outside flexible shaft can be prior to
Deformation occurs for flexible shaft, so as to further function as protective effect to flexible shaft.Therefore, the present apparatus by using flexible shaft and
Supporting positive cover efficiently solves that connection centralizer rigidity is excessive, and damping effect difference is to can not protect asking for connected component
Topic.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical
Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
In the accompanying drawings:
Fig. 1 shows the structural schematic diagram that centralizer and connector are connected in the utility model；
Fig. 2 shows the structural schematic diagrams of the connection centralizer in Fig. 1；
Fig. 3 shows the structural schematic diagram of the flexible shaft in Fig. 2；
Fig. 4 shows the structural schematic diagram of the first supporting positive cover in Fig. 2；
Fig. 5 shows the structural schematic diagram of the third supporting positive cover in Fig. 2；
Fig. 6 shows the structural schematic diagram of the second supporting positive cover in Fig. 2；
Fig. 7 shows the side view cutaway drawing of the second supporting positive cover in Fig. 6；
Fig. 8 shows the structural schematic diagram of the gasket in Fig. 2；
Wherein, the above drawings include the following reference numerals:
10, flexible shaft；11, step structure；12, annular groove is accommodated；13, the first sealing ring；20, the first supporting positive cover；21, first
Fitting flange；30, the second supporting positive cover；31, housing；32, inner sleeve；40, third supporting positive cover；41, the second fitting flange；50, gasket；
60, the second sealing ring；70, multi-core socket；80, dampening assembly；90, inserting tube hanging head component；100, micro- rectangular receptacle；110, resistance to compression
Cylinder；120, pipe nipple is measured；130, spiral cable.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have and the application
The normally understood identical meanings of person of an ordinary skill in the technical field.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is usually
It is for direction shown in the drawings, or for component itself is on vertical, vertical or gravity direction；Together
Sample, it for ease of understanding and describes, " inside and outside " refers to the inside and outside of the profile relative to each component itself, but the above-mentioned noun of locality is simultaneously
It is not used in limitation the utility model.
In order to solve to connect in the prior art, centralizer rigidity is excessive, damping effect is poor to protect connected portion
The problem of part, this application provides a kind of connection centralizers for measuring instrument.
As shown in Fig. 2, the connection centralizer for measuring instrument in the application includes flexible shaft 10 and along flexible shaft 10
The more piece supporting positive cover that sets gradually of axial direction.Supporting positive cover is set in the outside of flexible shaft 10, and an at least section supporting positive cover is towards soft
Property 10 side of axis surface have flexible layer.
Using above structure the connection centralizer for measuring instrument when, since the axis that uses of connection centralizer is flexible
Axis 10, so centralizer assumes responsibility for main deformation when device for subsurface measuring deforms.When centralizer is shaken,
Flexible shaft 10 can deformation occurs and absorbs the vibration that centralizer is subject to, and is guaranteeing connection so as to make to connect centralizer and is helping
The component connected is protected in the case where just.Since supporting positive cover is set in the outside of flexible shaft 10, so in centralizer
Supporting positive cover can play a protective role to flexible shaft 10 during work, prevent 10 rupture failure of flexible shaft.Again due at least
The surface of one section supporting positive cover towards 10 side of flexible shaft has flexible layer, so when centralizer is shaken, outside flexible shaft 10
The flexible layer in portion can deformation occurs prior to flexible shaft 10, so as to further function as protective effect to flexible shaft 10.Therefore,
The present apparatus by using flexible shaft 10 and supporting positive cover efficiently solves connection, and centralizer rigidity is excessive, damping effect is poor to nothing
Method protects the problem of connected component.
In a specific embodiment, the deformation of centralizer is 10 times of resistance to compression cylinder.
Optionally, flexible layer is rubber layer.Since connection centralizer is mainly used in petroleum drilling engineering, so not only needing
It wants flexible layer that there is certain deformability, but also needs flexible layer that there is certain wearability.Not only due to rubber material
With certain wearability, and hardness is moderate and has certain elasticity, so selecting rubber layer as flexible layer.From another party
Face sees that rubber material is cheap and is easily obtained, so can reduce the cost of flexible layer.As shown in Figure 1, in the application
The connector that connection centralizer connects at work is respectively resistance to compression cylinder 110, measurement pipe nipple 120 and spiral cable 130.
As shown in Figure 6 and Figure 7, at least a section supporting positive cover includes housing 31 and inner sleeve 32.There is axis on the side wall of housing 31
To the long hole of extension, and long hole be it is multiple, multiple long holes are provided at circumferentially spaced along housing 31；Inner sleeve 32 is embedded in housing 31
And there is the fin structure stretched out across long hole, inner sleeve 32 is located at the part in housing 31 as flexible layer.By by inner sleeve 32
Fin structure cooperated with long hole axially extending on 31 side wall of housing, the process that can be assembled in inner sleeve 32 and housing 31
In, guarantee inner sleeve 32 is fixed to each other with housing 31, to prevent housing 31 and inner sleeve during connecting centralizer work
It is produced relative sliding between 32.Also, since the fin of inner sleeve 32 can pass through the long hole of housing 31, so in connection centralizer
During work, additionally it is possible to circumferential support force is provided by fin for connection centralizer, to guarantee to connect centralizer
Stablize.
Optionally, fin structure is located at the integrated molding of the part in housing 31 with inner sleeve 32 and material is identical.In this way
Setting, can guarantee that fin structure and inner sleeve 32 are located at the bonding strength between the part in housing 31, to guarantee inner sleeve 32
Durability.And it is arranged to be integrally formed by the way that fin structure is located at the part in housing 31 with inner sleeve 32, may be used also in this way
To facilitate the processing of inner sleeve 32, the production efficiency of inner sleeve 32 is improved, and reduces the production cost of inner sleeve 32.
It is arranged to be made from a different material it is of course also possible to which fin structure is located at the part in housing 31 with inner sleeve 32
's.For 32 part of inner sleeve contacted in housing 31 with flexible shaft 10, need to be made of the material of Low rigidity, and the wing of inner sleeve 32
Chip architecture then can choose the relatively high material of rigidity and be made, so as to be bundled into the use intensity of fin structure, in reduction
The replacement frequency of set 32.
As shown in Fig. 2, more piece supporting positive cover includes sequentially connected first supporting positive cover 20, the second supporting positive cover 30 and third righting
Set 40, and the second supporting positive cover 30 includes inner sleeve 32 and housing 31.It is arranged in this way, can guarantees flexible shaft 10 and more piece righting
It can more easily be dismantled between set.Since the second supporting positive cover 30 includes inner sleeve 32 and housing 31, so being helped in connection
When positive device is shaken, the position that deformation occurs can be largely focused at the position of the second supporting positive cover 30, therefore can
Reduce the deformation at 10 both ends of flexible shaft, so as to be effectively protected the connector at connection centralizer both ends.
Optionally, the housing 31 of the first supporting positive cover 20, third supporting positive cover 40 and the second supporting positive cover 30 is made of metal material
's.First supporting positive cover 20 and third supporting positive cover 40 are made by using metal material, are effectively guaranteed connection centralizer and its
Bonding strength between the connector at both ends.And set the housing 31 of the second supporting positive cover 30 to made of metal material, it can
Guarantee that the housing 31 of the second supporting positive cover 30 has certain use intensity, to can prevent when flexible shaft 10 generates deformation
It connects centralizer and generates offset.
As shown in Figure 4 and Figure 5, housing 31 has the first fitting flange 21, the first dress towards one end of the first supporting positive cover 20
It stretches out and is connected on the end face of the first supporting positive cover 20 towards the first supporting positive cover 20 with flange 21, so that the end of the first supporting positive cover 20
The first fit-up gap is generated between face and the end face of the second supporting positive cover 30.It, can be to first by the way that the first fitting flange 21 is arranged
The relative mounting location of supporting positive cover 20 and the second supporting positive cover 30 is limited, to prevent the installation dislocation of the first supporting positive cover 20.And
And when connection centralizer is shaken, the flexible layer outside flexible shaft 10 and flexible shaft 10 can generate deformation, in order to reduce
The extruding that second supporting positive cover 30 generates the first supporting positive cover 20, it is therefore desirable to make end face and the second supporting positive cover of the first supporting positive cover 20
The first fit-up gap is generated between 30 end face.
Specifically, housing 31 has the second fitting flange 41, the second fitting flange 41 towards one end of third supporting positive cover 40
It stretches out and is connected on the end face of third supporting positive cover 40 towards third supporting positive cover 40, so that the end face of third supporting positive cover 40 and second
The second fit-up gap is generated between the end face of supporting positive cover 30.It, can be to third supporting positive cover 40 by the way that the second fitting flange 41 is arranged
It is limited with the relative mounting location of the second supporting positive cover 30, to prevent the installation dislocation of third supporting positive cover 40.And it connects and helps
When positive device is shaken, the flexible layer outside flexible shaft 10 and flexible shaft 10 can generate deformation, in order to reduce by the second supporting positive cover
30 pairs of third supporting positive covers 40 generate extruding, it is therefore desirable to make third supporting positive cover 40 end face and the second supporting positive cover 30 end face it
Between generate the second fit-up gap.
Shown in as shown in Fig. 2, Fig. 3 and Fig. 8, the both ends of corresponding second supporting positive cover 30 of flexible shaft 10 are formed with step structure
11, gasket 50 is provided between two adjacent sections supporting positive cover, and gasket 50 is pressed together at step structure 11.By in two adjacent sections righting
Gasket 50 is set between set, the friction between two adjacent sections supporting positive cover contact surface can be reduced, to extend the use of supporting positive cover
Service life.
Such as Fig. 2 and Fig. 3, flexible shaft 10 has multiple receiving annular grooves 12, and multiple receiving annular grooves towards the surface of supporting positive cover
12 along flexible shaft 10 axially spaced-apart be arranged, connection centralizer further include multiple first sealing rings 13, multiple first sealing rings 13
It is arranged in a one-to-one correspondence in multiple receiving annular grooves 12.And in the one end and of the first supporting positive cover 20 far from the second supporting positive cover 30
The one end of three supporting positive covers 40 far from the second supporting positive cover 30 is ibid provided with multiple receiving annular grooves 12, and in 20 He of the first supporting positive cover
Multiple second sealing rings 60 have been arranged in a one-to-one correspondence in the receiving annular groove 12 of third supporting positive cover 40.Due to connecting the work of centralizer
There are liquid for environment, so can prevent liquid from entering connection centralizer by the first sealing ring 13 of setting and the second sealing ring 60
It is internal.
As shown in Fig. 2, connection centralizer further include: multi-core socket 70, dampening assembly 80, inserting tube hanging head component 90 and micro-
Rectangular receptacle 100.The first end of more piece supporting positive cover is arranged in multi-core socket 70；The of more piece supporting positive cover is arranged in dampening assembly 80
Two ends；The one end of dampening assembly 80 far from more piece supporting positive cover is arranged in inserting tube hanging head component 90；Micro- setting of rectangular receptacle 100 is being visited
In pipe hanger head assembly 90.One specific embodiment is, multi-core socket 70 is by being threadably mounted at the first end of more piece supporting positive cover
Hole in, the first supporting positive cover 20 and third supporting positive cover 40 are separately fixed at the both ends of the second supporting positive cover 30 by screw thread.Damping group
Part 80 is fixed by screws in the second end of more piece supporting positive cover.Micro- rectangular receptacle 100 is fixed by screws in inserting tube hanging head component
On 90 hanging head.The line that appropriate length is welded on multi-core socket 70, passes through the first supporting positive cover 20, flexible shaft 10, third supporting positive cover
40 and dampening assembly 80 hole, connect with micro- rectangular receptacle 100.
It can be seen from the above description that the above embodiments of the utility model achieve the following technical effects:
The shortcomings that overcoming existing connection centralizer, in slimhole drilling, the connection centralizer in the application is in energy
Under conditions of enough guaranteeing that connector works normally, it can occur reasonably to deform, to deform when device for subsurface measuring
When, centralizer assumes responsibility for main deformation, when connector and centralizer are shaken, can protect connected connector.
Obviously, above-mentioned described embodiment is only the embodiment of the utility model a part, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work
The range of the utility model protection all should belong in the every other embodiment obtained.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, work, device, component and/or their combination.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein can be in addition to illustrating herein
Or the sequence other than those of description is implemented.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of connection centralizer for measuring instrument characterized by comprising
Flexible shaft (10)；
The more piece supporting positive cover set gradually along the axial direction of the flexible shaft (10), the supporting positive cover are set in the flexible shaft (10)
Outside, and supporting positive cover described in an at least section towards the flexible shaft (10) side surface have flexible layer.
2. connection centralizer according to claim 1, which is characterized in that the flexible layer is rubber layer.
3. connection centralizer according to claim 1, which is characterized in that supporting positive cover described in an at least section includes:
Housing (31), has axially extending long hole on the side wall of the housing (31), and the long hole be it is multiple, it is multiple described
Long hole is provided at circumferentially spaced along the housing (31)；
Inner sleeve (32), the inner sleeve (32) are embedded in the housing (31) and have the fin knot stretched out across the long hole
Structure, the inner sleeve (32) are located at the part in the housing (31) as the flexible layer.
4. connection centralizer according to claim 3, which is characterized in that the fin structure is located at the inner sleeve (32)
Part in the housing (31) is integrally formed and material is identical.
5. connection centralizer according to claim 3, which is characterized in that the more piece supporting positive cover includes sequentially connected
One supporting positive cover (20), the second supporting positive cover (30) and third supporting positive cover (40), and second supporting positive cover (30) includes the inner sleeve
(32) and the housing (31).
6. connection centralizer according to claim 5, which is characterized in that first supporting positive cover (20), the third are helped
The housing (31) of positive set (40) and second supporting positive cover (30) is made of metal material.
7. connection centralizer according to claim 5, which is characterized in that
The housing (31) has the first fitting flange (21) towards one end of first supporting positive cover (20), first assembly
Flange (21) is stretched out towards first supporting positive cover (20) and is connected on the end face of first supporting positive cover (20), so that described
The first fit-up gap is generated between the end face of first supporting positive cover (20) and the end face of second supporting positive cover (30)；And/or
The housing (31) has the second fitting flange (41) towards one end of the third supporting positive cover (40), second assembly
Flange (41) is stretched out towards the third supporting positive cover (40) and is connected on the end face of the third supporting positive cover (40), so that described
The second fit-up gap is generated between the end face of third supporting positive cover (40) and the end face of second supporting positive cover (30).
8. connection centralizer according to claim 7, which is characterized in that corresponding second righting of the flexible shaft (10)
The both ends of set (30) are formed with step structure (11), and gasket (50), the gasket are provided between supporting positive cover described in two adjacent sections
(50) it is pressed together at the step structure (11).
9. connection centralizer according to any one of claim 1 to 8, which is characterized in that flexible shaft (10) direction
The surface of the supporting positive cover has multiple receiving annular grooves (12), and multiple receivings annular groove (12) are along the flexible shaft (10)
Axially spaced-apart setting, the connection centralizer further includes multiple first sealing rings (13), multiple first sealing rings (13) one
One is correspondingly arranged in multiple receiving annular grooves (12).
10. connection centralizer according to any one of claim 1 to 8, which is characterized in that the connection centralizer also wraps
It includes:
The first end of the more piece supporting positive cover is arranged in multi-core socket (70), the multi-core socket (70)；
The second end of the more piece supporting positive cover is arranged in dampening assembly (80), the dampening assembly (80)；
Inserting tube hanging head component (90), inserting tube hanging head component (90) setting are helped in the dampening assembly (80) far from the more piece
The one end just covered；
Micro- rectangular receptacle (100), micro- rectangular receptacle (100) setting is in the inserting tube hanging head component (90).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822064576.0U CN209539282U (en) | 2018-12-10 | 2018-12-10 | Connection centralizer for measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822064576.0U CN209539282U (en) | 2018-12-10 | 2018-12-10 | Connection centralizer for measuring instrument |
Publications (1)
| Publication Number | Publication Date |
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| CN209539282U true CN209539282U (en) | 2019-10-25 |
Family
ID=68263859
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822064576.0U Active CN209539282U (en) | 2018-12-10 | 2018-12-10 | Connection centralizer for measuring instrument |
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| Country | Link |
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| CN (1) | CN209539282U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441372A (en) * | 2018-12-10 | 2019-03-08 | 北京市普利门电子科技有限公司 | Connection centralizer for measuring instrument |
-
2018
- 2018-12-10 CN CN201822064576.0U patent/CN209539282U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441372A (en) * | 2018-12-10 | 2019-03-08 | 北京市普利门电子科技有限公司 | Connection centralizer for measuring instrument |
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