CN110160467A - Deep hole detection system - Google Patents
Deep hole detection system Download PDFInfo
- Publication number
- CN110160467A CN110160467A CN201910570728.0A CN201910570728A CN110160467A CN 110160467 A CN110160467 A CN 110160467A CN 201910570728 A CN201910570728 A CN 201910570728A CN 110160467 A CN110160467 A CN 110160467A
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- deep hole
- driving wheel
- driving
- walking
- detection system
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- 238000001514 detection method Methods 0.000 title claims abstract description 61
- 238000004020 luminiscence type Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
-
- 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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2408—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring roundness
-
- 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
Abstract
The present invention discloses a kind of deep hole detection system, it include: running gear, for being walked in tested sounding hole expert, including car body and walking unit, walking unit includes driving wheel, elastic portion and the driving portion of setting on the car body, elastic portion is connected to provide on the hole wall that elastic force makes driving wheel be supported on deep hole when detecting deep hole to driving wheel between driving wheel and car body, and driving portion is used to that driving wheel to be driven to drive running gear walking when detecting deep hole；Detection device, including luminescence unit and receiving unit, luminescence unit is arranged on the car body, for when detecting deep hole, to the hole wall emission detection light line of deep hole, receiving unit to be used to receive the detection light of hole wall reflection；Control device is connect with receiving unit signal, is configured as calculating straightness, diameter and/or the circularity of deep hole according to the reception result of receiving unit.Deep hole detection system provided by the invention can the deep hole to part effectively detected, it is compact-sized, easy to use.
Description
Technical field
The present invention relates to deep hole detection field, in particular to a kind of deep hole detection system.
Background technique
In accurate or ultraprecise field of machining, circularity, straightness or the diameter equidimension shadow of part how are controlled
Ring the multiple performances such as cooperation, the vibration of part.Therefore, it is necessary to accurately measure the indexs such as the circularity of deep hole, straightness, to help
In accurately checking and accepting, whether part is qualified, also contributes to improving machining accuracy when part manufactures again.Publication No.
The Chinese patent application of CN101571379A discloses a kind of method of seamless round steel pipe diameter and straightness parameter measurement, should
Method includes: the calibration for completing to be made of multi-linear structured light vision sensors parameter video camera and multi-thread laser projecting apparatus；In quilt
It surveys seamless round steel pipe and nearby lays multi-linear structured light vision sensors；Computer controls laser projecting apparatus projective structure light respectively
For plane to seamless round steel pipe measured section, video camera acquires seamless round steel pipe surface optical strip image, carries out at optical strip image
Reason.This method is appropriate only for detection external cylindrical surface Linearity surveying, is not suitable for the detection of the inner cylinder face of deep hole.For with depth
Hole is the part in key job shape face, such as Barrel of Hydraulic Cylinders, and the deep hole and outside piston cylinder of cylinder barrel form precision pair,
The Geometrical indexes such as straightness, diameter, circularity directly affect the assembly and service performance of engineering machinery host.
Summary of the invention
The purpose of the present invention is to provide a kind of deep hole detection system, the deep hole detection system can deep hole to part into
Row effectively detection, it is compact-sized, easy to use.
The present invention discloses a kind of deep hole detection system, comprising:
Running gear, for walking in tested sounding hole expert, including car body and walking unit, the walking unit include setting
Set driving wheel, elastic portion and driving portion on the car body, the elastic portion be connected to the driving wheel and the car body it
Between with to the driving wheel provide elastic force be supported on the driving wheel on the hole wall of the deep hole when detecting the deep hole, institute
Driving portion is stated for driving the driving wheel to drive the running gear walking when detecting the deep hole；
Detection device, including luminescence unit and receiving unit, the luminescence unit is arranged on the car body, for examining
To the hole wall emission detection light line of the deep hole when surveying the deep hole, the receiving unit is used to receive the inspection of the hole wall reflection
Survey light；
Control device is connect with the receiving unit signal, is configured as the reception result meter according to the receiving unit
Calculate the straightness, diameter and/or circularity of the deep hole.
In some embodiments, the driving wheel is movably disposed at the car body along the radial direction of a center line
On, the center line is arranged along the direction of travel of the running gear, and the elastic portion provides in described to the driving wheel
The elastic force of the radial direction of heart line, so that the driving wheel is supported on the hole wall of the deep hole when detecting the deep hole.
In some embodiments, the walking unit further include for supported when detecting the deep hole hole wall from
Driving wheel, the driven wheel and the driving wheel are distributed around one along the center line that the direction of travel of the running gear is arranged.
In some embodiments, circumferential direction of two driven wheels with the driving wheel along the center line is uniformly distributed.
In some embodiments, the walking unit includes driving wheel carrier, and the driving wheel is rotatably connected to described
Drive on wheel carrier, the elastic portion includes compressed spring, the both ends of the compressed spring respectively with the driving wheel carrier and described
Car body connection.
In some embodiments, the driving portion include the first driving motor, it is coaxial with first driving motor and consolidate
Surely the first sprocket wheel for connecting, and second sprocket wheel that is fixedly connected coaxial with the driving wheel and with first sprocket wheel and described
The chain of two sprocket engagements.
In some embodiments, running gear includes multiple walking units, and the multiple walking unit is filled along the walking
The direction of travel distribution set.
In some embodiments, the running gear further includes shaft and the carrying that is fixedly connected with one end of the shaft
Platform, the shaft are arranged along the direction of travel of the car body, and the luminescence unit includes the light on the carrying platform
Source and reflective mirror, the running gear further include the second driving motor connecting with the other end of the shaft, and described second drives
Dynamic motor is for driving the shaft to rotate.
In some embodiments, the control device is connect with the driving portion and the second driving motor signal, institute
It states control device and is configured as the signal control driving portion and second driving motor.
In some embodiments, the receiving unit is CCD camera.
In some embodiments, the driving wheel is plasticity idler wheel.
Based on deep hole detection system provided by the invention, pass through the inspection of the hole wall emission detection light line and reception hole wall of deep hole
Light is surveyed, detecting light based on the received using control device may be implemented the circularity to deep hole hole wall, straightness or diameter etc.
Effective detection, meanwhile, by the way that elastic connection driving wheel on the car body is arranged on the car body of running gear, is driven for driving
The driving portion and elastic portion of driving wheel walking can be such that running gear adapts to steady along the different hole wall of the axial arrangement size of deep hole
Fixed walking, helps to improve detection accuracy.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the deep hole detection system of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the running gear of deep hole of embodiment of the present invention detection system；
Fig. 3 is the partial structure diagram of running gear shown in Fig. 2；
Fig. 4 is the partial structure diagram of running gear shown in Fig. 2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
The deep hole detection system of the present embodiment includes running gear 10, detection device and control device 2.
As shown in Figures 1 to 4, running gear 10 in tested sounding hole 9 for walking.Running gear 10 includes car body 14
And walking unit, walking unit include driving wheel 13, elastic portion and the driving portion being arranged on car body 14, elastic portion is connected to drive
To provide elastic force to driving wheel 13 between driving wheel 13 and car body 14, so that driving wheel 13 is supported on deep hole 9 when detecting deep hole 9
On hole wall, driving portion when detecting deep hole 9 for driving driving wheel 13 to drive running gear 10 along the center line 30 of car body 14
Extending direction walking.
Detection device includes luminescence unit and receiving unit, and luminescence unit is arranged on car body 14, in detection deep hole 9
When to deep hole 9 hole wall emission detection light line, receiving unit be used for receive hole wall reflection detection light；
Control device 2 is connect with receiving unit signal, is configured as calculating deep hole 9 according to the reception result of receiving unit
Straightness, diameter and/or circularity.
As shown, the driving wheel 13 of the present embodiment can be adjacent to the hole wall of deep hole 9 under the action of elastic portion, thus
Running gear 10 can be driven to walk under the action of driving portion, since driving wheel 13 passes through elastic portion elastic connection in car body 14
On, when the diameter or profile of hole wall change, driving wheel 13 can be to the micro shifting in direction close to or far from car body 14
It is dynamic, so as to better adapt to and stabilized walking.The luminescence unit of the present embodiment can include light source 6 and reflective as shown in the figure
Mirror 7, light source 6 can be laser emitter etc., and light source 6 issues the hole that is vertically reflected into deep hole 9 of the detection light by reflective mirror 7
On wall, detection light forms reflection again by being received list by optical filter 5 after the reflection of reflective mirror 7 on the hole wall of deep hole 9
Member receives.Optical filter 5 can filter out the light of specific wavelength, avoid the interference of external light source, and receiving unit can be as shown in Figure 1
Including CCD (charge-coupled device) video camera 4 being mounted on mounting rack 3.Control device is received by acquisition CCD camera 4
The image obtained after detection light can be calculated after carrying out the processing such as image mosaic, signal conversion by calculating and analyzing
The data such as straightness, diameter and/or the circularity of deep hole 9.(specific calculating process and principle can refer to Publication No.
The Chinese patent application of CN101571379A)
Deep hole detection system provided in this embodiment passes through the inspection of the hole wall emission detection light line and reception hole wall of deep hole 9
Light is surveyed, detecting light based on the received using control device 2 may be implemented the circularity to 9 hole wall of deep hole, straightness or diameter
Deng effective detection, meanwhile, by be arranged on the car body 14 of running gear 10 driving wheel 13 of the elastic connection on car body 14,
Driving portion and elastic portion for driving driving wheel 13 to walk, can make running gear 10 adapt to the axial arrangement along deep hole 9
The different hole wall stabilized walking of size, helps to improve detection accuracy.Meanwhile the running gear of the present embodiment is driven by itself
Wheel drive, structure is more compact, helps to improve the simplicity and flexibility of detection.
In some embodiments, driving wheel 13 is movably disposed on car body 14 along the radial direction of a center line 30,
Center line 30 is arranged along the direction of travel of running gear, and elastic portion provides the bullet of the radial direction along center line 30 to driving wheel 13
Power, so that on the hole wall that driving wheel 13 is supported on deep hole when detecting deep hole.The setting facilitates the direction of travel for making car body 14
It is mutually close with the axis of deep hole 9, improve detection accuracy.
In some embodiments, as shown in Figure 1 to Figure 3, walking unit further includes for supporting hole wall when detecting deep hole 9
Driven wheel, driven wheel and driving wheel 13 are distributed around the center line 30 of car body 14.Driven wheel, which is arranged, can make the row of car body 14
It walks more steady.
In some embodiments, as shown in figure 3, two driven wheels and driving wheel 13 uniformly divide along the circumferential of center line 30
Cloth.Two driven wheels and driving wheel 13 can be spaced 120 ° of settings, to be conducive to the direction of travel and tested sounding hole 9 of car body
Axis alignment, improve detection accuracy.
In some embodiments, as shown in Figures 1 to 4, walking unit includes driving wheel carrier 16, and driving wheel 13 is rotationally
Be connected on driving wheel carrier 16, elastic portion includes compressed spring 12, the both ends of compressed spring 12 respectively with 13 frame of driving wheel and vehicle
Body 14 connects.Driving wheel carrier 16 can also be movably disposed in the sleeve 15 being fixedly connected with car body 14, be further increased
The stationarity that moves radially of the driving wheel 13 along the center line 30 of car body 14.
In some embodiments, driving portion includes the first driving motor 23, and fix company coaxial with the first driving motor 23
The first sprocket wheel 24 for connecing, and second sprocket wheel 25 that is fixedly connected coaxial with driving wheel 13 and with the first sprocket wheel 24 and the second sprocket wheel 25
The chain 26 of engagement.The setting can make the arrangement of driving portion more flexible, convenient, and the structure for helping to improve running gear is tight
Gathering property.Power supply 20 it is possible to further which the first driving motor 23 will be given to power is arranged on car body 14, to further increase
The structural compactness of running gear and flexibility.
In some embodiments, as shown in Figure 1 to Figure 3, running gear 10 includes multiple walking units, multiple walking units
Along the direction of travel distribution of the running gear 10 of car body 14.Multiple walking units are set, so as to be arranged multiple driving wheels 13,
Multiple driven wheels and driving portion.As shown, running gear 10 is provided with two walking units, driving portion further includes third driving
Motor 21, power supply 20 are powered to the first driving motor 23 and third driving motor 21 simultaneously, and the first driving motor 23 and third are driven
Dynamic motor 21 respectively can drive respective driving wheel 13 by transmission device 22.
In some embodiments, running gear 10 further includes that shaft 11 and the carrying being fixedly connected with one end of shaft 11 are flat
Platform 8, shaft 11 are arranged along the direction of travel of car body 14, and luminescence unit includes the light source 6 and reflective mirror 7 on carrying platform 8,
Running gear 10 further includes the second driving motor 19 connecting with the other end of shaft 11, and the second driving motor 19 turns for driving
Axis 11 rotates.Shaft 11 rotates, and is able to drive light source 6 and reflective mirror 7 carries out 360 ° of rotations, so that detection device can be to one
The whole circumference of the hole wall of deep hole 9 on a axial position carries out the transmitting and reception of detection light, carries out data acquisition.Second
Driving motor 19 can be connect by deceleration mechanism 18 and shaft coupling 17 with shaft 11.
In some embodiments, control device 2 is connect with driving portion and 19 signal of the second driving motor, 2 quilt of control device
It is configured to signal control driving portion and the second driving motor 19.The setting can make deep hole detection system more controllable, facilitate
Improve the convenience and accuracy of detection.
In some embodiments, the driving wheel 13 is plasticity idler wheel.Plasticity idler wheel helps to reduce the abrasion to hole wall.
In some embodiments, deep hole detection system is set in detection platform 1.
In some embodiments, control device 2 described above can be for for executing function described in the invention
General processor, programmable logic controller (PLC) (Programmable Logic Controller, referred to as: PLC), number letter
Number processor (Digital Signal Processor, referred to as: DSP), specific integrated circuit (Application Specific
Integrated Circuit, referred to as: ASIC), field programmable gate array (Field-Programmable Gate Array,
Referred to as: FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components or its
It is any appropriately combined.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (11)
1. a kind of deep hole detection system characterized by comprising
Running gear (10), for the walking in tested sounding hole (9), including car body (14) and walking unit, the walking is single
Member includes driving wheel (13), elastic portion and the driving portion being arranged on the car body (14), and the elastic portion is connected to the drive
Make the driving wheel (13) in detection institute to provide elastic force to the driving wheel (13) between driving wheel (13) and the car body (14)
It is supported on the hole wall of the deep hole (9) when stating deep hole (9), the driving portion is for driving institute when detecting deep hole (9)
It states driving wheel (13) and drives running gear (10) walking；
Detection device, including luminescence unit and receiving unit, the luminescence unit is arranged on the car body (14), for examining
To the hole wall emission detection light line of the deep hole (9) when surveying the deep hole (9), the receiving unit is anti-for receiving the hole wall
The detection light penetrated；
Control device (2) is connect with the receiving unit signal, is configured as being calculated according to the reception result of the receiving unit
Straightness, diameter and/or the circularity of the deep hole (9).
2. deep hole detection system as described in claim 1, which is characterized in that the driving wheel (13) is along a center line (30)
Radial direction is movably disposed on the car body (14), and the center line (30) sets along the direction of travel of the running gear
It sets, the elastic portion provides the elastic force of the radial direction along the center line (30) to the driving wheel (13), so that the drive
Driving wheel (13) is supported on the hole wall of the deep hole (9) when detecting deep hole (9).
3. deep hole detection system as described in claim 1, which is characterized in that the walking unit further includes in detection institute
The driven wheel of the hole wall is supported when stating deep hole (9), the driven wheel and the driving wheel (13) are filled around one along the walking
Set center line (30) distribution of the direction of travel setting of (10).
4. deep hole detection system as claimed in claim 3, which is characterized in that two driven wheels and the driving wheel (13)
Circumferential direction along the center line (30) is uniformly distributed.
5. deep hole detection system as described in claim 1, which is characterized in that the walking unit includes driving wheel carrier (16),
The driving wheel (13) is rotatably connected on the driving wheel carrier (16), and the elastic portion includes compressed spring (12), institute
The both ends for stating compressed spring (12) are connect with the driving wheel carrier (16) and the car body (14) respectively.
6. deep hole detection system as described in claim 1, which is characterized in that the driving portion includes the first driving motor
(23), the first sprocket wheel (24), coaxial with the driving wheel (13) that is coaxial with first driving motor (23) and being fixedly connected
And the second sprocket wheel (25) being fixedly connected and the chain (26) engaged with first sprocket wheel (24) and second sprocket wheel (25).
7. such as deep hole detection system described in any one of claims 1 to 6, which is characterized in that running gear (10) includes more
A walking unit, the multiple walking unit are distributed along the direction of travel of the running gear.
8. deep hole detection system as described in claim 1, which is characterized in that the running gear (10) further includes shaft (11)
The carrying platform (8) being fixedly connected with one end of the shaft (11), walking of the shaft (11) along the car body (14)
Direction setting, the luminescence unit include the light source (6) and reflective mirror (7) on the carrying platform (8), the walking dress
Setting (10) further includes the second driving motor (19) connecting with the other end of the shaft (11), and second driving motor is used for
The shaft (11) are driven to rotate.
9. deep hole detection system as claimed in claim 7, which is characterized in that the control device (2) and the driving portion and
Second driving motor (19) signal connection, the control device (2) are configured as signal and control the driving portion and described
Second driving motor (19).
10. deep hole detection system as described in claim 1, which is characterized in that the receiving unit is CCD camera (4).
11. the deep hole detection system as described in claims 1 to 10 is any, which is characterized in that the driving wheel (13) is plasticity
Idler wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910570728.0A CN110160467A (en) | 2019-06-28 | 2019-06-28 | Deep hole detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910570728.0A CN110160467A (en) | 2019-06-28 | 2019-06-28 | Deep hole detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110160467A true CN110160467A (en) | 2019-08-23 |
Family
ID=67636824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910570728.0A Pending CN110160467A (en) | 2019-06-28 | 2019-06-28 | Deep hole detection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN110160467A (en) |
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| CN112648937A (en) * | 2019-10-13 | 2021-04-13 | 中北大学 | Hole detection device with anti-rotation mechanism and detection method |
| CN115290009A (en) * | 2022-10-08 | 2022-11-04 | 徐州市汇力高强标准件有限公司 | High-precision straightness measuring instrument for inner central axis of pipe fitting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115290009A (en) * | 2022-10-08 | 2022-11-04 | 徐州市汇力高强标准件有限公司 | High-precision straightness measuring instrument for inner central axis of pipe fitting |
| CN115290009B (en) * | 2022-10-08 | 2022-12-20 | 徐州市汇力高强标准件有限公司 | High-precision straightness measuring instrument for inner central axis of pipe fitting |
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