CN106271938B - A kind of double face abrading machine - Google Patents
A kind of double face abrading machine Download PDFInfo
- Publication number
- CN106271938B CN106271938B CN201610649600.XA CN201610649600A CN106271938B CN 106271938 B CN106271938 B CN 106271938B CN 201610649600 A CN201610649600 A CN 201610649600A CN 106271938 B CN106271938 B CN 106271938B
- Authority
- CN
- China
- Prior art keywords
- oil groove
- groove
- bearing body
- storage tank
- lower millstone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/10—Single-purpose machines or devices
- B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
- B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B45/00—Means for securing grinding wheels on rotary arbors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a kind of double face abrading machine, and it includes lathe housing, and lower millstone is provided with lathe housing, and upper millstone is provided with above lower millstone, is provided with the driver for being used for driving upper millstone to rotate in lathe housing, driver is fixed in lathe housing, it is characterised in that：The mounting groove for being used for installing lower millstone is provided with lathe housing, lower millstone is rotatably assorted with mounting groove, a plane bearing is provided between the lower surface of the lower millstone and the bottom land of mounting groove, for supporting lower millstone；Described plane bearing includes discoid bearing body, the bottom land of bearing body and mounting groove is fixed, linearly increase circumferentially arranged with least two storage tanks, the rotation direction of the groove depth lower millstone of any storage tank on the lateral wall of bearing body, a ball is equipped with each storage tank.The present invention provides a kind of double face abrading machine, and the active force that the workpiece between its upper millstone and lower millstone is subject to is small, and product rejection rate is low.
Description
Technical field
The present invention relates to the technical field of lathe, a kind of specifically double face abrading machine.
Background technology
Last procedure that double face abrading machine is processed generally as sheet type product, it makes the end of workpiece by grinding
Face precision is high.And the mounting means of existing double face abrading machine peace lower millstone is generally divided into two kinds, one, lower millstone be fixedly mounted on machine
On bed and upper millstone is by motor driven, two, upper millstone rotated forward by motor driving, lower millstone inverts lower mill by motor driving
Disk.Regardless of whether be fixed lower millstone or the lower millstone of reversion, it, can be due to upper millstone in double face abrading machine initial start stage
Acceleration is larger and causes to cause part workpiece fragmentation, increases product rejection rate.
The content of the invention
The technical problems to be solved by the invention are：A kind of double face abrading machine is provided, it can make lower millstone in initial start stage
Rotated with upper millstone, therefore the active force that the workpiece between upper millstone and lower millstone is subject to is small, product rejection rate is low.
The technical solution used in the present invention is：A kind of double face abrading machine is provided, it includes lathe housing, is set in lathe housing
There is lower millstone, upper millstone is provided with above lower millstone, the driver for being used for driving upper millstone to rotate, driver are provided with lathe housing
It is fixed in lathe housing, it is characterised in that：The mounting groove for being used for installing lower millstone, lower millstone and installation are provided with lathe housing
Groove is rotatably assorted, and a plane bearing is provided between the lower surface of the lower millstone and the bottom land of mounting groove, for supporting lower millstone；
Described plane bearing includes discoid bearing body, and the bottom land of bearing body and mounting groove is fixed, bearing sheet
Linearly increase circumferentially arranged with least two storage tanks, the rotation direction of the groove depth lower millstone of any storage tank on the lateral wall of body
Greatly, it is equipped with a ball in each storage tank, the diameter of ball is more than the groove depth of storage tank circumferentially corresponding smaller one end, and
Less than the groove depth of storage tank circumferentially corresponding larger one end, when bearing body is installed in mounting groove, lower millstone for
The circumferential directed force F of bearing body drives the inwall tight fit of ball and mounting groove.
Described storage tank is six, and six storage tanks are uniformly distributed along the circumference of bearing body.
The storage tank is located on two madial walls corresponding to the axial direction of bearing body nearly notch position and is respectively equipped with one grade
Bar, slipped for limiting ball from notch position, the length direction of the both ends of shelves bar along storage tank extend to in storage tank
Side wall is fixed.
The position that the shelves bar is located at corresponding to accommodating smaller one end of groove deep is provided with a breach, for inserting appearance for ball
Put in groove.
The upper surface of bearing body is located at center and is recessed center oil groove, along center on the upper surface of bearing body
Oil groove is provided at circumferentially spaced multiple fan-shaped seed oil grooves, and oil supplying hole is provided with the bearing body, for backbone oil
Groove fluid, be respectively equipped with the side wall of each nearly center oil groove of seed oil groove one connected with center oil groove cross oil groove, the seed oil groove
Bottom land on along the end positions corresponding to the circumference of bearing body be respectively equipped with the first oilhole and the second oilhole, in bearing body
The first oilhole and the second oilhole connected corresponding to respective seed oil groove is respectively provided with corresponding to the position where each seed oil groove
Connection oil circuit.
The transition oil groove of an annular is provided between the seed oil groove and center oil groove, each seed oil groove passes through respective mistake respectively
Oil groove connects with transition oil groove, in the fluid overflow in the oil groove of center to transition oil groove.
Nearly bottom land position is provided with an excessively oily inclined hole, described excessively oily inclined hole edge level side on the madial wall of the center oil groove
To extension is downwardly inclined, with connection transition oil groove and center oil groove.
The aperture of the described nearly center oil groove position of excessively oily inclined hole is less than position where transition oil groove near with excessively oily inclined hole
The aperture put.
The shape of cross section of the center oil groove is circle, and the diameter of the bottom land position of the center oil groove is more than center
The diameter of oil groove notch position.
Described transition oil groove is built at least one porous filter body, and the filter body is spherical structure.
After above structure, a kind of double face abrading machine of the invention has advantages below compared with prior art：First, drive
Dynamic device drives upper millstone to rotate, and upper millstone passes through the frictional force between the frictional force between workpiece and workpiece and lower millstone
Lower millstone is driven to rotate, therefore it can be realized relative between upper millstone and lower millstone under the effect of inertia of lower millstone
Rotate and be ground workpiece, while workpiece fragmentation in the larger active force of initial start stage will not be caused due to upper millstone again, secondly,
By the design of storage tank and ball, make bearing body easy for installation, while its unloading process is also easy, finally, lower millstone turns
When dynamic, oil lamella is formed between lower millstone and bearing body, is connect firmly with bearing body so as to avoid in lower millstone rotation process
Touch, therefore frictional force is small, shakes small, lower millstone stability of rotation, while rolling element need not be set, therefore manufacturing cost reduces.
Brief description of the drawings
Fig. 1 is the structural representation of the double face abrading machine of the present invention.
Fig. 2 is the axle side schematic diagram of the plane bearing part of the present invention.
Fig. 3 is the axle side schematic diagram of the other direction of plane bearing part of the present invention.
Fig. 4 is the schematic top plan view that the plane bearing of the present invention is partially loaded in mounting groove.
Fig. 5 is the schematic side view that the plane bearing of the present invention is partially loaded in mounting groove.
Fig. 6 is the schematic cross-sectional view in " A-A " direction in Fig. 4.
Fig. 7 is the schematic cross-sectional view in " B-B " direction in Fig. 4.
Fig. 8 is the close-up schematic view in " C " region in Fig. 7.
Wherein, 1, bearing body, 2, center oil groove, 3, seed oil groove, 4, oil supplying hole, 5, cross oil groove, the 6, first oilhole, 7, the
Two oilholes, 8, transition oil groove, 9, excessively oily inclined hole, 10, filter body, the 11, the 3rd oilhole, 12, annular oil-recovery tank, 13, oil-recovery tank,
14th, connecting groove, 15, cover plate, 16, pad, 17, raised, 18, storage tank, 19, ball, 20, lathe housing, 21, shelves bar,
21.1st, breach, 22, lower millstone, 23, upper millstone, 24, driver；
F refers in lower millstone rotation process for the circumferential active force of bearing body.
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
The present invention provides a kind of double face abrading machine, and it includes lathe housing 20, and lower millstone 22, lower mill are provided with lathe housing 20
The top of disk 22 is provided with upper millstone 23, and the driver 24 for being used for driving upper millstone 23 to rotate, driver 24 are provided with lathe housing 20
It is fixed in lathe housing 20, it is characterised in that：The mounting groove for being used for installing lower millstone, lower millstone 22 are provided with lathe housing 20
It is rotatably assorted with mounting groove, a plane bearing is provided between the lower surface of the lower millstone 22 and the bottom land of mounting groove, for propping up
Support lower millstone 22；
Described plane bearing includes discoid bearing body 1, and the bottom land of bearing body 1 and mounting groove is fixed, bearing
Circumferentially arranged with least two storage tanks 18, the rotation side of the groove depth lower millstone 22 of any storage tank 18 on the lateral wall of body 1
To linear increase, a ball 19 is equipped with each storage tank 18, the diameter of ball 19 is circumferentially corresponding more than storage tank 18
The groove depth of smaller one end, and less than the groove depth of the circumferentially corresponding larger one end of storage tank 18, when bearing body 1 is installed on
When in tankage, lower millstone 22 drives the inwall tight fit of ball 19 and mounting groove for the circumferential directed force F of bearing body 1.
Described storage tank 18 is six, and circumference of six storage tanks 18 along bearing body 1 is uniformly distributed.
The storage tank 18 is located on two madial walls corresponding to the axial direction of bearing body 1 nearly notch position and is respectively equipped with one
Shelves bar 21, slipped for limiting ball 19 from notch position, the length direction of the both ends of shelves bar 21 along storage tank 18 extend to
The madial wall of storage tank 18 is fixed.
The position that the shelves bar 21 is located at corresponding to the smaller one end of the groove depth of storage tank 18 is provided with a breach 21.1, for for rolling
Pearl 19 is inserted in storage tank 18.
The ball 19 is the base ball of a rigidity, and base outer surface of ball is provided with top layer.
The top layer is electrodeposited coating of the plating on base outer surface of ball, and electrodeposited coating can be that soft aluminium, nickel, zinc etc. are soft
Matter metal level.
The top layer is the hard rubber layers that a coefficient of friction is more than 1.
The upper surface of bearing body 1 is located at center and is recessed center oil groove 2, edge on the upper surface of bearing body 1
Center oil groove 2 is provided at circumferentially spaced multiple fan-shaped seed oil grooves 3, oil supplying hole 4 is provided with the bearing body 1, for supplying
The fluid of center oil groove 2 is given, an oil groove excessively connected with center oil groove 2 is respectively equipped with the side wall of each nearly center oil groove 2 of seed oil groove 3
5, the first oilhole 6 and second is respectively equipped with along the end positions corresponding to the circumference of bearing body 1 on the bottom land of the seed oil groove 3
Oilhole 7, the interior position corresponding to where each seed oil groove 3 of bearing body 1 are respectively provided with corresponding to the respective seed oil groove 1 of connection
The connection oil circuit of first oilhole 6 and the second oilhole 7.
The transition oil groove 8 of an annular is provided between the seed oil groove 3 and center oil groove 2, each seed oil groove 3 is respectively by respective
Cross oil groove 5 connected with transition oil groove 8, in the fluid overflow in center oil groove 2 to transition oil groove 8.
Nearly bottom land position is provided with an excessively oily inclined hole 9 on the madial wall of the center oil groove 2, and described excessively oily inclined hole 9 is along water
Square to extension is downwardly inclined, with connection transition oil groove 8 and center oil groove 2.
The aperture of the described nearly position of center oil groove 2 of excessively oily inclined hole 9 is less than and the nearly institute of transition oil groove 8 of excessively oily inclined hole 9
In the aperture of position.
During the shape of cross section of the center oil groove 2 is circle, and the diameter of the bottom land position of the center oil groove 2 is more than
The diameter of the notch position of heart oil groove 2.
Described transition oil groove 8 is built at least one porous filter body 10, and the filter body 10 is spherical structure.
On the bottom land of the seed oil groove 3 the 3rd oilhole is provided with along the radial direction of bearing body 1 away from the position of center oil groove 2
11, the 3rd oilhole 11 connects with the annular oil-recovery tank 12 on the lower surface of bearing body 1.When bearing body 1 is installed on bearing block
When, the inwall of above-mentioned annular oil-recovery tank 12 and bearing block forms the annular oil cavity of a sealing when coordinating.
An oil-recovery tank 13, radial direction of the oil-recovery tank 13 along bearing body 1 are equipped between the sub- oil groove 3 of arbitrary neighborhood two
Extend to the lateral wall through bearing body 1.
Described connection oil circuit refers to, the first oilhole 6 and the second oilhole 7 extend through the lower surface of bearing body 1, described
A connecting groove 14 is recessed on the lower surface of bearing body 1, where described connecting groove 14 from the aperture of the first oilhole 6
Position extends to the aperture position of the second oilhole 7, and a cover plate 15, the sealing of cover plate 15 first are covered in connecting groove 14
The aperture of the oilhole 7 of oilhole 6 and second, and cover plate 15 and connecting groove 14 surround to form a connection channel, for connecting the first oil
The oilhole 7 of hole 6 and second.
It is provided with a pad 16 between the cover plate 15 and bearing body 1, the nearly connecting groove 14 of the pad 16 and positioned at connecting
Connect the outer corresponding position of groove 14 and be provided with a projection 17, projection 17 extends to be formed along the outline of connecting groove 14 to join end to end
Loop configuration.
The installation process of the plane bearing part of the present invention is to insert bearing body in mounting groove, and now ball is positioned at appearance
Larger one end of groove depth of groove is put, therefore bearing body can normally load mounting groove, and when bearing body is in course of normal operation
In by lower millstone axial force, i.e. groove depth of the bearing body by circumferential active force (moment of torsion) ball moving to storage tank
Smaller one end, now the inwall of ball and mounting groove extrudes, and tight fit.Similarly, when needing to dismantle bearing body, it is only necessary to
It is detachable by bearing body reversion.
Certainly during specifically used, the lower surface of lower millstone is covered on bearing body 1 plane bearing of the present invention,
The lower surface of lower millstone is surrounded to form cavity with center oil groove 2, seed oil groove 3, transition oil groove 8, oil-recovery tank 13, and fluid is in each groove
Notch position and lower millstone lower surface between form oil film, therefore the bearing body in lower millstone rotation process with the present invention
Do not contacted firmly between 1.
Preferred embodiments of the present invention are described above, but are not to be construed as limiting the scope of the invention.This hair
Bright to be not only limited to above example, its concrete structure allows to change, all institutes in the protection domain of demand for independence of the present invention
The various change of work is within the scope of the present invention.
Claims (10)
1. a kind of double face abrading machine, it includes lathe housing (20), lower millstone (22), lower millstone (22) is provided with lathe housing (20)
Top is provided with upper millstone (23), and the driver (24) for being used for driving upper millstone (23) to rotate, driving are provided with lathe housing (20)
Device (24) is fixed in lathe housing (20), it is characterised in that：The installation for being used for installing lower millstone is provided with lathe housing (20)
Groove, lower millstone (22) are rotatably assorted with mounting groove, and one is provided between the lower surface of the lower millstone (22) and the bottom land of mounting groove
Plane bearing, for supporting lower millstone (22)；
Described plane bearing includes discoid bearing body (1), and the bottom land of bearing body (1) and mounting groove is fixed, bearing
Circumferentially arranged with least two storage tanks (18) on the lateral wall of body (1), the groove depth of any storage tank (18) is along lower millstone
(22) rotation direction linearly increases, and a ball (19) is equipped with each storage tank (18), and the diameter of ball (19), which is more than, to be held
Put the groove depth of groove (18) circumferentially corresponding smaller one end, and less than storage tank (18) circumferentially corresponding larger one end
Groove depth, when bearing body (1) is installed in mounting groove, lower millstone (22) drives for the circumferential directed force F of bearing body (1)
The inwall tight fit of ball (19) and mounting groove.
A kind of 2. double face abrading machine according to claim 1, it is characterised in that：Described storage tank (18) is six, six
Circumference of the storage tank (18) along bearing body (1) is uniformly distributed.
A kind of 3. double face abrading machine according to claim 2, it is characterised in that：The storage tank (18) is located at bearing body
(1) nearly notch position is respectively equipped with one grade of bar (21) on two madial walls corresponding to axial direction, for limiting ball (19) from groove
Mouthful position is slipped, and the length direction of the both ends of shelves bar (21) along storage tank (18) extends to be consolidated with the madial wall of storage tank (18)
It is fixed.
A kind of 4. double face abrading machine according to claim 3, it is characterised in that：The shelves bar (21) is located at storage tank (18) groove
Position corresponding to deep smaller one end is provided with a breach (21.1), for being inserted for ball (19) in storage tank (18).
A kind of 5. double face abrading machine according to claim 1, it is characterised in that：The upper surface of bearing body (1) is located at center
Position is recessed center oil groove (2), more along being provided at circumferentially spaced for center oil groove (2) on the upper surface of bearing body (1)
Individual fan-shaped seed oil groove (3), the bearing body (1) is interior to be provided with oil supplying hole (4), for backbone oil groove (2) fluid, each son
An oil groove (5) excessively connected with center oil groove (2), the seed oil groove are respectively equipped with the side wall of the nearly center oil groove (2) of oil groove (3)
(3) the first oilhole (6) and the second oilhole are respectively equipped with along the end positions corresponding to the circumference of bearing body (1) on bottom land
(7) position where, corresponding to each seed oil groove (3) in bearing body (1) is respectively provided with respective seed oil groove (3) institute of connection
Corresponding first oilhole (6) and the connection oil circuit of the second oilhole (7).
A kind of 6. double face abrading machine according to claim 5, it is characterised in that：The seed oil groove (3) and center oil groove (2) it
Between be provided with one annular transition oil groove (8), each seed oil groove (3) respectively by it is respective cross oil groove (5) with transition oil groove (8) even
It is logical, in fluid overflow to the transition oil groove (8) in center oil groove (2).
A kind of 7. double face abrading machine according to claim 6, it is characterised in that：It is near on the madial wall of the center oil groove (2)
Bottom land position is provided with an excessively oily inclined hole (9), and described excessively oily inclined hole (9) is downwardly inclined extension in the horizontal direction, for connecting
Cross oil groove (8) and center oil groove (2).
A kind of 8. double face abrading machine according to claim 7, it is characterised in that：The nearly center oil groove of described excessively oily inclined hole (9)
(2) aperture of position is less than the aperture with nearly transition oil groove (8) position of excessively oily inclined hole (9).
A kind of 9. double face abrading machine according to claim 7, it is characterised in that：The shape of cross section of the center oil groove (2)
For circle, and the diameter of the bottom land position of the center oil groove (2) is more than the diameter of center oil groove (2) notch position.
A kind of 10. double face abrading machine according to claim 6, it is characterised in that：Described transition oil groove (8) is built at least
One porous filter body (10), the filter body (10) are spherical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610649600.XA CN106271938B (en) | 2016-08-09 | 2016-08-09 | A kind of double face abrading machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610649600.XA CN106271938B (en) | 2016-08-09 | 2016-08-09 | A kind of double face abrading machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106271938A CN106271938A (en) | 2017-01-04 |
| CN106271938B true CN106271938B (en) | 2018-02-23 |
Family
ID=57667541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610649600.XA Expired - Fee Related CN106271938B (en) | 2016-08-09 | 2016-08-09 | A kind of double face abrading machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106271938B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108312002A (en) * | 2018-01-30 | 2018-07-24 | 海宁杰盛新材料有限公司 | One kind being used for advertising lamp box board processing device |
| CN109531402A (en) * | 2018-11-30 | 2019-03-29 | 嘉兴百盛光电有限公司 | A kind of twin grinder |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026669B2 (en) * | 1981-10-02 | 1985-06-25 | 日清工業株式会社 | grinding equipment |
| CN201009129Y (en) * | 2007-02-13 | 2008-01-23 | 安徽华天机械股份有限公司 | Ultra-micrometre accuracy two-sided grinding miller |
| CN201561046U (en) * | 2009-07-16 | 2010-08-25 | 林国爱 | Plane bearing |
| JP5524643B2 (en) * | 2010-01-29 | 2014-06-18 | アイシン高丘株式会社 | Brake disk rotor grinding apparatus and grinding method |
| CN104625907B (en) * | 2015-02-05 | 2016-08-10 | 宁波鑫其精密磁钢有限公司 | A kind of vertical double-sided grinding machine |
| CN105317840B (en) * | 2015-11-16 | 2018-01-12 | 哈尔滨理工大学 | A kind of heavy hydrostatic bearing deep fat carries decision method |
-
2016
- 2016-08-09 CN CN201610649600.XA patent/CN106271938B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN106271938A (en) | 2017-01-04 |
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Effective date of registration: 20191022 Address after: No.58 Jingyi Road, Chengbei Park, Jingjiang Economic Development Zone, Jingjiang City, Taizhou City, Jiangsu Province Patentee after: Jiangsu Honger Non-Ferrous Alloy Co., Ltd. Address before: With the three village 315191 Zhejiang city of Ningbo province Yinzhou District Zhang Jiang Town Patentee before: Ningbo City, Yinzhou an Pml Precision Mechanism Ltd |
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Granted publication date: 20180223 Termination date: 20200809 |
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