CN106197208B - A kind of electro spindle central spindle detection device - Google Patents
A kind of electro spindle central spindle detection device Download PDFInfo
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- CN106197208B CN106197208B CN201610514909.8A CN201610514909A CN106197208B CN 106197208 B CN106197208 B CN 106197208B CN 201610514909 A CN201610514909 A CN 201610514909A CN 106197208 B CN106197208 B CN 106197208B
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000000306 component Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The invention discloses a kind of electro spindle central spindle detection devices, including positioning mechanism and testing agency；Positioning mechanism includes positioning sleeve and positioning seat；First through hole is provided on positioning seat；Positioning cover for seat includes mounting plane and protrusion；Protrusion extends downwardly from mounting plane and is pierced by first through hole；Elastic mechanism is equipped between mounting plane and positioning seat；Mounting plane is equipped with the second through-hole, the first arc groove and locating rod, and the second through-hole extends downward into the bottom wall of protrusion；Locating rod is opposite with one end of the first arc groove and sets；Testing agency includes dial gauge, measurement axis and the first spring；The bottom of measurement axis is provided with taper hook；It measures axis and is inserted into the second through-hole；It measures axis and is equipped with connector；Dial gauge is fixed on connector, and measuring rod is inserted into the first arc groove and contacts with positioning seat；First spring is placed on outside measurement axis；Measurement axis is pushed, taper hook is pierced by from the second through-hole.The structure of the detecting device is simple, can quickly judge whether central spindle passes.
Description
Technical field
The present invention relates to electro spindle technical field more particularly to a kind of electro spindle central spindle detection devices.
Background technique
With the development of economy with the progress of science and technology, machine industry scale expanded rapidly, at the same time, modern machine
More and more new technologies are presented.High-speed electric main shaft is especially apparent as lathe core component, technological innovation.In electro spindle knot
In structure, central spindle component plays key effect as its core attachment.The intersecting point dimension of central spindle will have a direct impact on lathe " tool changing "
Therefore accuracy it is particularly important in process of production to measure its intersecting point dimension.
In general, the structure of central spindle product as shown in Figure 1, central spindle intersecting point dimension, refer to the height H in figure.Shown in Fig. 1,
The inner cavity of central spindle successively includes the first interconnected conical cavity, the first cylindrical cavity, the second conical cavity, the second cylinder from top to bottom
Chamber and third cylindrical cavity.Height H refers to the distance between first conical cavity top surface to the second conical cavity top surface.
At this stage, two methods are based primarily upon for the measurement of central spindle intersecting point dimension: 1) using profile tolerance instrument scanning profile
The size is directly obtained, advantage is precision height, the disadvantage is that profile tolerance instrument equipment is expensive, and for typical products in mass production, the method effect
Rate is low；2) central spindle crossing point examining tool and measurement taper hole diameter at butt end cubing are made by oneself, obtains the size by measuring conversion, advantage is inspection
Tool is at low cost and can reach testing requirements, the disadvantage is that needing to convert by various sizes, it is convenient to be unfavorable for production and processing personnel
It uses, be easy to cause conversion mistake.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of electro spindle central spindle detection devices, should
Structure of the detecting device is simple, is capable of the intersecting point dimension of quick obtaining central spindle, and simplicity judges whether central spindle passes.
The purpose of the present invention is implemented with the following technical solutions:
A kind of electro spindle central spindle detection device, including positioning mechanism and testing agency；
The positioning mechanism includes positioning sleeve and positioning seat；First through hole is provided on the positioning seat；The positioning seat
Set includes mounting plane and protrusion；The protrusion extends across described from the bottom of the mounting plane vertically downward
One through-hole；Elastic mechanism, one end of the elastic mechanism and the peace are provided between the mounting plane and the positioning seat
Plane connection is filled, the other end is connect with the positioning seat；Be provided on the mounting plane the second through-hole, the first arc groove and
Locating rod, second through-hole be first arc groove the center of circle, and second through-hole extend to vertically downward it is described convex
The bottom wall in portion out；The locating rod is opposite with one end of first arc groove and sets；
The testing agency includes dial gauge, measurement axis and the first spring；The bottom of the measurement axis is provided with conic clamp
It hooks；The measurement axis is inserted into second through-hole；The upper lateral of the measurement axis, which is extended, a connection piece；The percentage
Table is fixed on the connector, and the measuring rod of the dial gauge is inserted perpendicularly into first arc groove, and the dial gauge is surveyed
The gauge head of gauge rod is contacted with the roof of the positioning seat；First spring pocket be set to the measurement axis outside, one end with it is described
Connector connection, the other end are connect with the mounting plane；When pushing the measurement axis, the taper hook can be from described
Second through-hole is pierced by；When rotating the connector, the measuring rod of the dial gauge can be slided along first arc groove, when
When the measuring rod of the dial gauge turns to the first end of first arc groove, the connector connects with the locating rod
Touching.
Preferably, the positioning mechanism further includes at least one guide post；At least one is provided on the mounting plane
Pilot hole, the quantity of the pilot hole are equal with the quantity of the guide post；The guide post pass through the pilot hole with it is described
Positioning seat is fixedly connected.
Preferably, the elastic mechanism is set as second spring, and the second spring is sheathed on guiding described at least one
Outside column；One end of the second spring is connect with the mounting plane, and the other end is connect with the positioning seat.
Preferably, the quantity of the guide post is three, is denoted as guide post A, guide post B and guide post C respectively；Described three
Root guide post is uniformly distributed around the first through hole；The quantity of the second spring three is denoted as second spring A, respectively
Two spring Bs and second spring C；The second spring A is sheathed on outside the guide post A, and the second spring B is sheathed on described lead
To outside column B, the second spring C is sheathed on outside the guide post C.
Preferably, the guide post is set as screw, and the screw rod of the screw is threadedly coupled with the positioning seat, nut
It is set in the pilot hole.
Preferably, the elastic mechanism is set as third spring；On the positioning seat along the periphery of the first through hole to
Upper be extended has a boss；The third spring pocket is set to outside the boss, and top is connect with the mounting plane.
It preferably, further include shell, the shell surrounds the mounting plane and the positioning seat；The top of the shell
It is connect with the side wall of the mounting plane.
Preferably, the protrusion is set as rounding important actor.
Preferably, the measurement axis is spirally connected with the connector.
Preferably, the second arc groove is provided on the top surface of the positioning seat；Second arc groove and first arc
The shape of shape slot is consistent and position is corresponding up and down；The width of second arc groove is 4mm, depth 2mm.
Compared with prior art, the beneficial effects of the present invention are:
(1) electro spindle central spindle detection device provided by the present invention, structure is simple, passes through testing standard part and actual product
Intersecting point dimension, and carry out simple conversion and the actual processing size of product can be obtained, the traditional cubing avoided is when detecting
The conversion of very complicated improves accuracy；And avoid and detected using high-cost profile tolerance instrument, it effectively reduces into
This, detection efficiency is high.
(2) electro spindle central spindle detection device provided by the present invention, the set-up mode of spring mechanism are not fixed, can be set
In in guide post, also can be set on positioning seat.Because its taper hole size of the central spindle of different model is variant, such as HSKE50
Central spindle taper hole size with HSKA63 series can be bigger than the central spindle taper hole size of HSKE25, HSKE32 and HSKE40 series.Work as axis
The central spindle taper hole size of core is larger, causes error to prevent the pretightning force deficiency of spring, can increase boss in positioning seat, make
With the relatively large spring of pretightning force and it is sheathed on boss；And central spindle series lesser for central spindle taper hole size, it can
To use the lesser spring of pretightning force, and it is directly sleeved in guide post.I.e. the electro spindle central spindle detection device is applicable
Range is big, practical.
(3) electro spindle central spindle detection device provided by the present invention, positioning sleeve and positioning seat removably connect
It connects, when positioning sleeve occurs damaged, is convenient for changing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of central spindle product；
Fig. 2 is the appearance diagram of electro spindle central spindle detection device provided by the present invention；
Fig. 3 is the cross-sectional view of electro spindle central spindle detection device provided by the embodiment of the present invention 1；
Fig. 4 is the cross-sectional view of electro spindle central spindle detection device provided by the embodiment of the present invention 2；
In figure: 1, central spindle；2, positioning sleeve；3, positioning seat；4, second spring；5, shell；6, connector；7, guide post；8,
Measure axis；9, the first spring；10, measuring rod；11, dial gauge；12, locating rod；13, the first arc groove；14, third spring；20,
First conical cavity；21, the second conical cavity.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention:
As in Figure 2-4, a kind of electro spindle central spindle detection device, including positioning mechanism and testing agency；The localization machine
Structure includes positioning sleeve 2 and positioning seat 3；First through hole is provided on positioning seat 3；Positioning sleeve 2 includes mounting plane and protrusion；Institute
It states protrusion and extends across the first through hole vertically downward from the bottom of the mounting plane；The mounting plane and positioning
It is provided with elastic mechanism between seat 3, one end of the elastic mechanism is connect with the mounting plane, the other end and positioning seat 3
Connection；The second through-hole, the first arc groove 13 and locating rod 12 are provided on the mounting plane, second through-hole is the first arc
The center of circle of shape slot 13, and second through-hole extends to the bottom wall of the protrusion vertically downward；Locating rod 12 and the first arc
The first end of slot 13 is opposite and sets；The testing agency includes dial gauge 11, measurement axis 8 and the first spring 9；Measure axis 8
Bottom is provided with taper hook；Measurement axis 8 is inserted into second through-hole；The upper lateral of measurement axis 8, which is extended, a connection
Part 6；Dial gauge 11 is fixed on connector 6, and the measuring rod 10 of dial gauge 11 is inserted perpendicularly into the first arc groove 13, dial gauge 11
The gauge head of measuring rod 10 contacted with the roof of positioning seat 3；First spring 9 is sheathed on outside measurement axis 8, one end and connector 6
Connection, the other end are connect with the mounting plane；When pushing measurement axis 8, the taper hook can be from second through-hole
It is pierced by；When rotating connector 6, the measuring rod 10 of dial gauge 11 can be slided along the first arc groove 13, when the survey of dial gauge 11
When gauge rod 10 turns to the first end of the first arc groove 13, connector 6 is contacted with locating rod 12.
In the following, being further described to the set-up mode of the electro spindle central spindle detection device.
As shown in Figure 3-4, the positioning mechanism further includes at least one guide post 7；Be provided on the mounting plane to
A few pilot hole, the quantity of the pilot hole are equal with the quantity of guide post 7；Guide post 7 passes through the pilot hole and positioning
Seat 3 is fixedly connected.In order to facilitate the assembling of the device, guide post 7 can be set to screw, the screw rod and positioning seat of the screw
3 are threadedly coupled, and nut is set in the pilot hole.In order to enable the work of whole device is more stable, the number of guide post 7
Amount can be set to two；Two guide posts 7 are symmetrically disposed on the two sides of the first through hole.
As shown in figure 3, if the elastic mechanism, which can be set, is leading when the taper pore size of default test central spindle 1 is smaller
To on column 7.Specifically, the elastic mechanism is set as second spring 4, second spring 4 is sheathed on outside at least one guide post 7；
One end of second spring 4 is connect with the mounting plane, and the other end is connect with positioning seat 3.More specifically, the number of guide post 7
Amount is three, is denoted as guide post A, guide post B and guide post C respectively；Three guide posts 7 are uniformly divided around the first through hole
Cloth；The quantity of second spring 4 three is denoted as second spring A, second spring B and second spring C respectively；The second spring A set
Outside the guide post A, the second spring B is sheathed on outside the guide post B, and the second spring C is sheathed on described lead
To outside column C.The quantity of guide post 7 is set as root, so that the good operation stability of device, guarantees measuring accuracy.
As shown in figure 4, if the elastic mechanism can be set fixed when the taper pore size of default test central spindle 1 is larger
On the seat 3 of position.It specifically can be arranged such that, the elastic mechanism is set as third spring 14；Along the first through hole on positioning seat 3
Periphery upwardly extend and be provided with a boss；Third spring 14 is sheathed on outside the boss, and top and the mounting plane connect
It connects.
In addition, in order to enable entire detection device is more beautiful.Shell 5 can be set, shell 5 surrounds the mounting plane
With positioning seat 3；The top of shell 5 is connect with the mounting plane side wall, and when performing a test, shell 5 can be with positioning sleeve 2
Movement.
And in order to enable test is more accurate, the protrusion of positioning sleeve 2 can be set to rounding important actor, the structure of rounding important actor
Type is matched with the first conical cavity 20 in central spindle 1.When being tested, the taper hook of measurement axis 8 catches on the second taper in central spindle 1
The wall surface of chamber 21.And in order to enable positioning sleeve 2 in test, can flexible motion, on the protrusion of positioning sleeve 2 and positioning seat 3
First through hole between have certain fit clearance, fit clearance is in 0.003-0.005mm.
In order to enable the movement of measuring rod 10 is more smooth, it is more accurate to test.It can be arranged on the top surface of positioning seat 3
There is the second arc groove；Second arc groove is consistent with the shape of the first arc groove 13 and position is corresponding up and down；Second arc
The width of shape slot can be set to 4mm, and depth can be set to 2mm, the bottom of the gauge head of measuring rod 10 and second arc groove
Wall contact.
In addition, measurement axis 8 can be attached with connector 6 by the way of being spirally connected, assembling aspect.
The working principle and the course of work of electro spindle central spindle detection device provided by the present invention are as described below:
Firstly, dial gauge is using the general dimensional measuring instrument of tabular form made of accurate rack and pinion mechanism, it will be tested
The small linear movement of measuring staff caused by size, amplifies by gear drive, becomes referring to rotation of the meter on dial, to read
The size of measured size.Dial gauge is mainly used for measuring size and shape, the location error etc. of product.
In non-test state, the measurement axis of the electro spindle central spindle detection device is in the state to float up and down.When test,
Rotating connector makes it away from locating rod first, at this point, the measuring rod of dial gauge is slided along the first arc groove, and measures axis and exists
Rotation in second through-hole, and the taper hook of measurement axis is inwardly, which is in releasing orientation.Then, central spindle is arranged
(shape of protrusion need to be matched with the first conical cavity, will not hinder the roof and positioning sleeve of central spindle outside the protrusion of positioning sleeve
The fitting of mounting plane bottom wall, it is preferred that protrusion is set as rounding important actor), and make roof (i.e. the first taper of central spindle
The roof of chamber) it is bonded with the mounting plane bottom wall of positioning sleeve.Then, toward opposite direction rotating connector, while under power appropriate
Connector is pressed, at this point, the measuring rod of dial gauge is slided along the first arc groove, and axis is measured and is rotated in the second through-hole, when hundred
When the measuring rod of table being divided to turn to the first end of the first arc groove, connector is contacted with locating rod, at this point, the taper of measurement axis
Hook just towards the wall surface of the second conical cavity in central spindle, unclamps connector immediately, and the taper hook for measuring axis catches on the second cone
The measuring rod of the wall surface of shape chamber, dial gauge is upwarded pressure by positioning seat, and straight-line displacement occurs, and dial gauge is read.
Due to standard component intersecting point dimension it is known that and when testing standard part, the degree for adjusting dial gauge is 0.Test central spindle
When product, is simply converted according to the degree of dial gauge, and with the data of standard component, the intersection point ruler of central spindle product can be obtained
It is very little.
More specifically, the course of work is as follows:
After electro spindle central spindle detection device of the invention is completed, first have to standard component (standard component use alloy
Tool steel, the bounce measured between the conical surface and taper hole center line should be in 0.005mm) its precision is verified, it operates as follows:
1) dial gauge is corrected with the first standard component, adjusts pointer and be in and returns " 0 " state；
2) the first standard component is rotated, under different situations, the reading of dial gauge is in " 0 " state always；
3) the second full-length part is taken to be tested (intersecting point dimension of the second standard brick part and the intersecting point dimension of the first standard component
It is different), then according to percentage meter reading, simple algebraic operation is carried out, obtains the first intersecting point dimension of the second standard component；
4) intersecting point dimension for using the second standard component of profile tolerance instrument sweep test, obtains the second intersection point ruler of the second standard component
It is very little, if the error between the first intersecting point dimension of the second standard component and its second intersecting point dimension illustrates this dress within 0.01mm
The precision set reaches testing requirements.
Device correction finishes, and can test central spindle product, test process is as follows:
1) it will test device as standard state (i.e. dial gauge returns " 0 "), then rotating connector, measurement axis are in up and down
Quick condition；
2) central spindle is sheathed on positioning sleeve, and central spindle roof is bonded with positioning seat bottom wall, first pushes connector, then turns
Dynamic table connector is contacted until it with locating rod, at this point, unclamping connector, measurement axis hooks the cone of the second conical cavity in central spindle
The reading of dial gauge is read in face；
3) conversion obtains the intersecting point dimension of tested central spindle.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (10)
1. a kind of electro spindle central spindle detection device, which is characterized in that including positioning mechanism and testing agency；
The positioning mechanism includes positioning sleeve and positioning seat；First through hole is provided on the positioning seat；The positioning sleeve includes
Mounting plane and protrusion；The protrusion extends across described first from the bottom of the mounting plane vertically downward and leads to
Hole；Elastic mechanism is provided between the mounting plane and the positioning seat, one end of the elastic mechanism and the installation are flat
Face connection, the other end are connect with the positioning seat；The second through-hole, the first arc groove and positioning are provided on the mounting plane
Bar, second through-hole is the center of circle of first arc groove, and second through-hole extends to the protrusion vertically downward
Bottom wall；The locating rod is opposite with the first end of first arc groove and sets；
The testing agency includes dial gauge, measurement axis and the first spring；The bottom of the measurement axis is provided with taper hook；Institute
It states measurement axis and is inserted into second through-hole；The upper lateral of the measurement axis, which is extended, a connection piece；The dial gauge is solid
Due on the connector, and the measuring rod of the dial gauge is inserted perpendicularly into first arc groove, the dial gauge measuring rod
Gauge head contacted with the roof of the positioning seat；First spring pocket is set to outside the measurement axis, one end and the connection
Part connection, the other end are connect with the mounting plane；When pushing the measurement axis, the taper hook can be from described second
Through-hole is pierced by.
2. electro spindle central spindle detection device according to claim 1, which is characterized in that the positioning mechanism further includes at least
A piece guide post；At least one pilot hole, the quantity of the pilot hole and the guide post are provided on the mounting plane
Quantity is equal；The guide post passes through the pilot hole and is fixedly connected with the positioning seat.
3. electro spindle central spindle detection device according to claim 2, which is characterized in that the elastic mechanism is set as second
Spring, the second spring are sheathed on outside guide post described at least one；One end of the second spring and the mounting plane
Connection, the other end are connect with the positioning seat.
4. electro spindle central spindle detection device according to claim 3, which is characterized in that the quantity of the guide post is three
Root is denoted as guide post A, guide post B and guide post C respectively；Three guide posts are uniformly distributed around the first through hole；Institute
Quantity three for stating second spring, are denoted as second spring A, second spring B and second spring C respectively；The second spring A is arranged
In outside the guide post A, the second spring B is sheathed on outside the guide post B, and the second spring C is sheathed on the guiding
Outside column C.
5. electro spindle central spindle detection device according to claim 2, which is characterized in that the guide post is set as screw,
The screw rod of the screw is threadedly coupled with the positioning seat, and nut is set in the pilot hole.
6. electro spindle central spindle detection device according to claim 1, which is characterized in that the elastic mechanism is set as third
Spring；Periphery on the positioning seat along the first through hole, which upwardly extends, is provided with a boss；The third spring pocket is set to
Outside the boss, top is connect with the mounting plane.
7. electro spindle central spindle detection device according to claim 1, which is characterized in that it further include shell, the shell packet
Enclose the mounting plane and the positioning seat；The top of the shell is connect with the side wall of the mounting plane.
8. electro spindle central spindle detection device according to claim 1, which is characterized in that the protrusion is set as inverted round stage
Column.
9. electro spindle central spindle detection device according to claim 1, which is characterized in that the measurement axis and the connector
It is spirally connected.
10. electro spindle central spindle detection device according to claim 1, which is characterized in that set on the top surface of the positioning seat
It is equipped with the second arc groove；Second arc groove is consistent with the shape of first arc groove and position is corresponding up and down；Described
The width of two arc grooves is 4mm, depth 2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610514909.8A CN106197208B (en) | 2016-06-30 | 2016-06-30 | A kind of electro spindle central spindle detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610514909.8A CN106197208B (en) | 2016-06-30 | 2016-06-30 | A kind of electro spindle central spindle detection device |
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| CN106197208B true CN106197208B (en) | 2019-01-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107478184A (en) * | 2017-08-18 | 2017-12-15 | 广州市昊志机电股份有限公司 | A kind of handle of a knife accuracy detecting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608889A (en) * | 2009-07-21 | 2009-12-23 | 河南省西峡汽车水泵股份有限公司 | Big of a kind of pump housing and the conical surface are measured the measuring method and the specific purpose tool of distance of round |
| CN203464892U (en) * | 2013-10-09 | 2014-03-05 | 山东博特精工股份有限公司 | Symmetry-degree testing device for square-flange-plate end-face groove |
| CN105423870A (en) * | 2015-12-18 | 2016-03-23 | 天津天海同步科技有限公司 | Gauge of internal conical face depth |
-
2016
- 2016-06-30 CN CN201610514909.8A patent/CN106197208B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608889A (en) * | 2009-07-21 | 2009-12-23 | 河南省西峡汽车水泵股份有限公司 | Big of a kind of pump housing and the conical surface are measured the measuring method and the specific purpose tool of distance of round |
| CN203464892U (en) * | 2013-10-09 | 2014-03-05 | 山东博特精工股份有限公司 | Symmetry-degree testing device for square-flange-plate end-face groove |
| CN105423870A (en) * | 2015-12-18 | 2016-03-23 | 天津天海同步科技有限公司 | Gauge of internal conical face depth |
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| CN106197208A (en) | 2016-12-07 |
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