CN207272921U - High rotating speed closed type static pressure rotary table - Google Patents
High rotating speed closed type static pressure rotary table Download PDFInfo
- Publication number
- CN207272921U CN207272921U CN201721234836.3U CN201721234836U CN207272921U CN 207272921 U CN207272921 U CN 207272921U CN 201721234836 U CN201721234836 U CN 201721234836U CN 207272921 U CN207272921 U CN 207272921U
- Authority
- CN
- China
- Prior art keywords
- base
- static pressure
- rotating speed
- hydrostatic bearing
- rotary table
- 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.)
- Active
Links
Landscapes
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Machine Tool Units (AREA)
Abstract
The utility model discloses a kind of high rotating speed closed type static pressure rotary table, the motor that the work top and driving workbench coordinated including base, with base rotation rotates, the lower part of the work top is equipped with shaft fixed vertically, axial arranged air passage is equipped with shaft, the lower section of the base is equipped with pedestal, the pedestal is equipped with the venthole that can be connected with air passage, the work top is equipped with the vacuum cup connected with air passage, and hydrostatic bearing is equipped between the work top and base.The utility model aims to provide a kind of high rotating speed closed type static pressure rotary table compact-sized, positioning accuracy is higher.
Description
Technical field
The utility model belongs to mirror grinding and polishing field, more particularly to a kind of high rotating speed closed type static pressure revolution work
Platform.
Background technology
Eyeglass minute surface in optical instrument needs to carry out high-precision grinding and polishing, needs to pass through in grinding and polishing
Grinding station is positioned in face of workpiece, and it is to use pressure/dynamic-static pressure rotary table face, the dynamic and hydrostatic bearing of table top to be ground table top at present
Using open architecture, such as China Patent No.：CN201815876U, discloses a kind of open-type static pressure revolution work for controlling floatation volume
Platform, including work table rotation axis adjective-centre structure, hydraulic floating binding clasp, the multi-head pump of device for revolving and driving and hydraulic pressure fuel feeding,
It is characterized in that workbench turntable body lower cylindrical and the endoporus of bull gear use coaxial basic hole system clearance fit, bull gear is consolidated
It is scheduled on workbench turntable body and falls jointly on slide, being positioned apart from hydraulic pressure in the gap of bull gear protrusion workbench floats
Dynamic binding clasp, the static-pressure oil chamber of slide upper surface are connected with the flowline of quantitative multi-head pump；With higher level degree and coarse
The static-pressure oil chamber composition hydrostatic slideway pair of the bull gear bottom surface of degree and slide upper surface；Turn round centration axis and be installed on slide
Central part, centration axis use hole base system of fits with workbench turntable body centre bore, and lower spacer ring, upper spacer ring, disk are put in centration axis periphery
Axial thrust cylindrical bearing is disposed between chip type spring and Biserial cylindrical roller bearing, end cap, disk type are passed down through by bolt
Spring and distribution ring are allowed to and centration axis major diameter upper end locking, realization positioning；Gear reduction box is installed on slide side, thereon
Two gears are engaged with bull gear, drive work table rotation；Circular gratings are installed on centration axis top, realize that workbench circumgyration is closed
Ring measures.
However, since existing workbench is using T-slot positioning workpiece, come workpiece pressing by way of pressing plate compression,
Thus need to by the diameter design of rotary table into the diameter more than maximum grinding workpiece, while blank must also reserve compared with
Big precompressed position, and items precision is unstable when the structure of the dynamic and static pressure of open type can then cause table top pressure-bearing or revolution
It is fixed, and since table top rotating speed is low so causing grinding efficiency low.
Utility model content
The utility model is to overcome above-mentioned deficiency of the prior art, there is provided a kind of compact-sized, positioning accuracy
Higher high rotating speed closed type static pressure rotary table.
To achieve these goals, the utility model uses following technical scheme：
A kind of high rotating speed closed type static pressure rotary table, includes the work top and drive of base and base rotation cooperation
The motor that dynamic workbench rotates, the lower part of the work top are equipped with shaft fixed vertically, are equipped with shaft axial arranged
Air passage, the lower section of the base are equipped with pedestal, and the pedestal is equipped with the venthole that can be connected with air passage, the workbench
Face is equipped with the vacuum cup connected with air passage, and hydrostatic bearing is equipped between the work top and base.
In the prior art, in order to realize the steady positioning of workpiece, the diameter of workbench have to be larger than maximum grinding workpiece
Diameter, while to be also that workpiece blank reserves larger precompressed position, therefore it is higher for space requirement, so as to influence processing essence
Degree.Workpiece to be processed is compressed by T-slot and table positions, and by the pressing plate on workbench so that workpiece holds
Easily deform.In the present solution, work is placed on vacuum cup, using atmospheric pressure increase workpiece to the pressure of table top so as to
Add frictional force between the two, so may dispense with table top because of clamping increased workbench diameter and workpiece blank because
Required reserved position and increased diameter, make whole table top show compacter.Vacuum suction suction is uniformly and from workpiece
The change of shape and change, there is no particular/special requirement to workpiece material, be conducive to improve machining accuracy.
Preferably, the vacuum cup is equipped with the centre bore connected with air passage, the upper surface of vacuum cup is equipped with
The annular groove of some arranged concentrics and one of the radial slot for connecting each annular groove with centre bore, the annular groove
Equipped with sealing ring.In this way, when workpiece is positioned on vacuum cup, sealing ring is placed according to workpiece size, ensures maximum limit
The covering sealing ring of degree, forms the vacuum of maximum area, when the vacuum generator outside air passage connection is vacuumized, respectively
The annular groove of a arranged concentric is connected by radial slot with centre bore, and centre bore is connected with air passage, the ring in sealing ring
Shape groove and radial slot form vacuum, and vacuum adsorption force is produced to workpiece.
Preferably, the hydrostatic bearing is annular in shape, the upper and lower surface of hydrostatic bearing is respectively equipped with hydrostatic bearing
Some static pressure supporting regions of heart arrangement, the static pressure supporting region are equipped with static pressure in sector, the inner ring of the hydrostatic bearing
Some radial direction supporting regions of bearing centre arrangement.The upper and lower surface of hydrostatic bearing is equipped with static pressure supporting region, has on inner ring and radially holds
Area is carried, static pressure supporting region and radial direction supporting region are contactless bearing area, are had more compared to traditional open hydrostatic bearing
High carrying and stability so that when workbench may operate at higher rotating speed, distal end bounce and footpath jump can still control
Smaller range.
Preferably, the bottom of the work top is equipped with fixed bearer ring, the edge of the bearer ring be equipped with it is quiet
The lower acting surface that pressure underside bearing surface is slidably matched, the lower surface of the work top is equipped with matches somebody with somebody with hydrostatic bearing upper surface slide
The upper acting surface closed, the base are equipped with the side wall for accommodating hydrostatic bearing and bearer ring, and the side wall is consolidated with hydrostatic bearing
Fixed connection, the side wall be equipped with the upper through hole that is connected between hydrostatic bearing upper surface, upper acting surface and with static pressure axis
Hold lower surface, the lower through-hole of lower acting surface connection.In this way, fluid enters hydrostatic bearing upper surface, upper acting surface by upper through hole
Between, entered by lower through-hole between hydrostatic bearing lower surface, lower acting surface, and the inner ring of hydrostatic bearing is entered, so that
Secure support is provided for work top.
Preferably, the side wall upper part of the base is equipped with the upper pressure chamber connected with upper through hole, the lower sidewall of base
Equipped with the lower pressure chamber connected with lower through-hole, the oilhole of the upper through hole of connection and lower through-hole is equipped with the base.Upper through hole and
Lower through-hole is respectively equipped with pressure chamber, can play the role of stable oil liquid pressure, reduces pressure oscillation.Meanwhile upper through hole is with
Connected between through hole by oilhole, be conducive to keep through hole and lower through-hole pressure constant, ensure the accurate positioning of work top.
Preferably, the oilhole runs through the top of base side wall, the top of the base side wall along vertical direction
Equipped with lower groove, the both sides of the groove are respectively equipped with lower convexity, and the bottom of the work top is equipped with what is coordinated with lower groove
Upper groove that is upper raised and coordinating with lower convexity.In this way, fluid also can establish oil pressure at the top of side wall at the same time, so as to aid in
Work top is supported, improves the rotational stability of work top.
Preferably, the bottom of the shaft is equipped with coaxially arranged swivel joint seat, the swivel joint seat center is set
There is the central airway connected with air passage, the side of swivel joint seat is equipped with some and side stomata of venthole position correspondence, institute
The side stomata stated is connected with central airway.Swivel joint seat can opposite base rotate, swivel joint seat works as side in rotation process
Connect both when stomata is with venthole position correspondence, so as to constantly extract internal air out, so can both ensure that vacuum was inhaled
The vacuum of Pan Chu, and do not interfere with the rotation of work top.
Preferably, the motor includes stator and the rotor positioned at stator interior, the rotor is set in shaft
Bottom, is equipped with the transmission ring being fixedly connected between rotor bottom and shaft bottom, the stator is fixedly connected with base.Motor
Stator is fixed with base, and rotor is fixed with shaft, and after the structure of such motor is combined with workbench, structure is more tight
Gather.Cast out retarder and shaft joint at the same time, the tight-holding type mounting means of original shaft coupling is changed to flange form mounting means, greatly
It is big to strengthen connection rigidity.
Preferably, the lower section of the base is equipped with Circular gratings, the outer ring of the Circular gratings is fixedly connected with pedestal, described
The inner ring of Circular gratings is fixedly connected with swivel joint seat.Round grating is installed to be allowed to produce close loop control circuit with motor, so as to
Work top is set to coordinate lifting shaft to carry out linkage grinding among grinding process.
Preferably, the middle part of the shaft is equipped with baffle ring, shaft is equipped with the locating slot of positioning baffle ring, the baffle ring
Positioned at the top of base.Baffle ring plays acting on for positioning tool during assembling, in order to which each component carries out installation positioning in shaft.
The beneficial effects of the utility model are：（1）When being positioned to workpiece suction uniformly and from workpiece shapes change and
Change, avoids being deformed workpiece during locating clip clamping of workpieces, does not have particular/special requirement to workpiece material, positional flexibility is higher；
（2）Reliable for the positioning stablity of workpiece, work top can still maintain relatively low distal end to beat and footpath when high rotating speed is ground
Jump, ensure that machining accuracy；（3）Retarder and shaft joint are eliminated, structure is more compact, and it is firm to have greatly reinforced connection
Property, improve transmission accuracy.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of the utility model；
Fig. 2 is the structure diagram of vacuum cup in the utility model；
Fig. 3 is the structure diagram of hydrostatic bearing in the utility model.
In figure：Base 1, lower through-hole 1a, oilhole 1b, upper through hole 1c, upper pressure chamber 1d, side wall 1e, lower pressure chamber 1f, works
Table top 2, vacuum cup 3, centre bore 3a, annular groove 3b, radial slot 3c, bearer ring 4, hydrostatic bearing 5, static pressure supporting region 5a, footpath
To supporting region 5b, baffle ring 6, motor 7, stator 7a, rotor 7b, transmission ring 8, swivel joint seat 9, central airway 9a, side stomata 9b,
Pedestal 10, venthole 10a, Circular gratings 11, bottom plate 12, shaft 13, air passage 13a.
Embodiment
The utility model is further described with reference to the accompanying drawings and detailed description.
In embodiment as shown in Figure 1, a kind of high rotating speed closed type static pressure rotary table, including base 1, work top 2
With motor 7, wherein work top is located above base, and the lower part of work top is equipped with shaft 13, and the top of shaft is equipped with ladder
Face, the center of work top are equipped with perforative connecting hole, and shaft is carried out some with merga pass using cascaded surface with work top
Bolt is fixed, and fixed aftertable face is horizontal, and shaft is in vertical position.Air passage 13a is equipped with shaft,
Air passage is axially through shaft.The middle part of shaft is equipped with baffle ring 6, and shaft is equipped with the locating slot of positioning baffle ring, and baffle ring is located at
The top of base.
The bottom of shaft is equipped with coaxially arranged swivel joint seat 9.Swivel joint seat center is equipped with central airway 9a, center
Air flue is axial arranged along swivel joint seat, and central airway is connected with air passage, and the side of swivel joint seat is equipped with four side stomatas
9b, radial arrangement of the side stomata along swivel joint seat, the inner of side stomata are connected with central airway.The lower section of base is equipped with bottom plate
12 and pedestal 10, bottom plate be fixedly connected with the bottom of base, the through of bottom plate is simultaneously fixedly connected with pedestal, and pedestal is equipped with
Venthole 10a, position and the venthole position correspondence of venthole.
Motor is arranged between base and shaft, and motor includes the stator 7a and rotor 7b positioned at stator interior, rotor
The bottom of shaft is set in, the transmission ring 8 being fixedly connected is equipped between rotor bottom and shaft bottom, stator is fixed with base to be connected
Connect.The lower section of base is equipped with Circular gratings 11, and the outer ring of Circular gratings is fixedly connected with pedestal, inner ring and the swivel joint seat of Circular gratings
It is fixedly connected.
Work top is equipped with the vacuum cup 3 connected with air passage, and with reference to shown in Fig. 2, vacuum cup is equipped with and ventilation
The centre bore 3a of road connection, the upper surface of vacuum cup be equipped with some arranged concentrics annular groove 3b and by each annular groove with
One of the radial slot 3c of centre bore connection, annular groove are equipped with sealing ring.
The bottom of work top is equipped with fixed bearer ring 4, and hydrostatic bearing 5, static pressure are equipped between work top and base
Bearing is annularly set on bearer ring.The edge of bearer ring is equipped with the lower acting surface being slidably matched with hydrostatic bearing lower surface,
The lower surface of work top be equipped with hydrostatic bearing upper surface slide coordinate upper acting surface, base be equipped with accommodate hydrostatic bearing and
The side wall 1e of bearer ring, side wall are fixedly connected with hydrostatic bearing, and side wall is equipped between hydrostatic bearing upper surface, upper acting surface
The upper through hole 1c of the connection and lower through-hole 1a connected with hydrostatic bearing lower surface, lower acting surface.With reference to shown in Fig. 3, static pressure axis
The upper and lower surface held is respectively equipped with quiet in sector with the centrally disposed eight static pressure supporting region 5a of hydrostatic bearing, static pressure supporting region
The inner ring that last item is held is equipped with the centrally disposed six radial direction supporting regions 5b of hydrostatic bearing.
The side wall upper part of base is equipped with the upper pressure chamber 1d connected with upper through hole, and the lower sidewall of base is equipped with and lower through-hole
The lower pressure chamber 1f of connection, the interior oilhole for being equipped with the upper through hole of connection and lower through-hole of base.Oilhole runs through base along vertical direction
The top of side wall, the top of base side wall are equipped with lower groove, and the both sides of groove are respectively equipped with lower convexity, and the bottom of work top is set
There is upper raised and with lower convexity cooperation the upper groove coordinated with lower groove.
In actual moving process, workpiece to be ground is placed on the vacuum cup of work top, chooses suitable ruler
Very little sealing ring is put into the annular groove of vacuum cup so that has good leakproofness between workpiece and vacuum cup.Bottom
The upper through hole and lower through-hole of seat are connected with exterior oil line pipe, by exterior oil line pipe to providing oil pressure in base so that quiet
The upper surface that last item is held is separated with work top, and the inner ring of hydrostatic bearing and lower surface are separated with bearer ring.The venthole of pedestal
Vacuum generator outside connection, starts vacuum generator and is outwards evacuated, by absorption of workpieces on vacuum cup.After electric motor starting
Work top is driven to rotate, vacuum generator continues to produce vacuum at vacuum cup when being ground, hydrostatic bearing
Upper and lower surface and inner ring produce oil pressure and work top are carried out to stablize support, ensure the machining accuracy of workpiece.
Claims (10)
1. a kind of high rotating speed closed type static pressure rotary table, it is characterized in that, including base（1）With base（1）The work being rotatably assorted
Make table top（2）And the motor that driving workbench rotates（7）, the work top（2）Lower part be equipped with shaft fixed vertically
（13）, shaft（13）It is interior to be equipped with axial arranged air passage（13a）, the base（1）Lower section be equipped with pedestal（10）, the base
Seat（10）Being equipped with can be with air passage（13a）The venthole of connection（10a）, the work top（2）It is equipped with and air passage
（13a）The vacuum cup of connection（3）, the work top（2）And base（1）Between be equipped with hydrostatic bearing（5）.
2. high rotating speed closed type static pressure rotary table according to claim 1, it is characterized in that, the vacuum cup（3）
It is equipped with and air passage（13a）The centre bore of connection（3a）, vacuum cup（3）Upper surface be equipped with some arranged concentrics annular groove
（3b）And by each annular groove（3b）With centre bore（3a）The radial slot of connection（3c）, the annular groove（3b）One of
Equipped with sealing ring.
3. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the hydrostatic bearing
（5）Annularly, hydrostatic bearing（5）Upper and lower surface be respectively equipped with hydrostatic bearing（5）Centrally disposed some static pressure supporting regions
（5a）, the static pressure supporting region（5a）In sector, the hydrostatic bearing（5）Inner ring be equipped with hydrostatic bearing（5）Center
Some radial direction supporting regions of arrangement（5b）.
4. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the work top（2）
Bottom be equipped with fixed bearer ring（4）, the bearer ring（4）Edge be equipped with and hydrostatic bearing（5）Lower surface is slidably matched
Lower acting surface, the work top（2）Lower surface be equipped with and hydrostatic bearing（5）The upper acting surface that upper surface slide coordinates,
The base（1）Equipped with receiving hydrostatic bearing（5）And bearer ring（4）Side wall（1e）, the side wall（1e）With static pressure axis
Hold（5）It is fixedly connected, the side wall（1e）It is equipped with and hydrostatic bearing（5）What is connected between upper surface, upper acting surface is upper logical
Hole（1c）And and hydrostatic bearing（5）Lower surface, the lower through-hole of lower acting surface connection（1a）.
5. high rotating speed closed type static pressure rotary table according to claim 4, it is characterized in that, the base（1）Side wall
（1e）Top is equipped with and upper through hole（1c）The upper pressure chamber of connection（1d）, base（1）Side wall（1e）Lower part is equipped with and lower through-hole
（1a）The lower pressure chamber of connection（1f）, the base（1）It is interior to be equipped with the upper through hole of connection（1c）And lower through-hole（1a）Oilhole.
6. high rotating speed closed type static pressure rotary table according to claim 5, it is characterized in that, the oilhole is along vertical
Base is run through in direction（1）Side wall（1e）Top, the base（1）Side wall（1e）Top be equipped with lower groove, the groove
Both sides are respectively equipped with lower convexity, the work top（2）Bottom be equipped with and upper raised and and lower convexity that lower groove coordinates
The upper groove of cooperation.
7. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the shaft（13）'s
Bottom is equipped with coaxially arranged swivel joint seat（9）, the swivel joint seat（9）Center is equipped with and air passage（13a）Connection
Central airway（9a）, swivel joint seat（9）Side be equipped with some and venthole（10a）The side stomata of position correspondence（9b）, institute
The side stomata stated（9b）With central airway（9a）Connection.
8. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the motor（7）Including
Stator（7a）And positioned at stator（7a）Internal rotor（7b）, the rotor（7b）It is set in shaft（13）Bottom, rotor
（7b）Bottom and shaft（13）The transmission ring being fixedly connected is equipped between bottom（8）, the stator（7a）With base（1）It is fixed to connect
Connect.
9. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the base（1）Under
Side is equipped with Circular gratings（11）, the Circular gratings（11）Outer ring and pedestal（10）It is fixedly connected, the Circular gratings（11）Inner ring
With swivel joint seat（9）It is fixedly connected.
10. high rotating speed closed type static pressure rotary table according to claim 1 or 2, it is characterized in that, the shaft（13）'s
Middle part is equipped with baffle ring（6）, shaft（13）It is equipped with positioning baffle ring（6）Locating slot, the baffle ring（6）Positioned at base（1）'s
Top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234836.3U CN207272921U (en) | 2017-09-25 | 2017-09-25 | High rotating speed closed type static pressure rotary table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234836.3U CN207272921U (en) | 2017-09-25 | 2017-09-25 | High rotating speed closed type static pressure rotary table |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207272921U true CN207272921U (en) | 2018-04-27 |
Family
ID=61983021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721234836.3U Active CN207272921U (en) | 2017-09-25 | 2017-09-25 | High rotating speed closed type static pressure rotary table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207272921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107791123A (en) * | 2017-09-25 | 2018-03-13 | 杭州杭机股份有限公司 | A kind of high rotating speed closed type static pressure rotary table |
-
2017
- 2017-09-25 CN CN201721234836.3U patent/CN207272921U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107791123A (en) * | 2017-09-25 | 2018-03-13 | 杭州杭机股份有限公司 | A kind of high rotating speed closed type static pressure rotary table |
| CN107791123B (en) * | 2017-09-25 | 2019-06-07 | 浙江杭机股份有限公司 | A kind of high revolving speed closed type static pressure rotary table |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107791123B (en) | A kind of high revolving speed closed type static pressure rotary table | |
| CN102689239B (en) | Full-symmetrical type five-axis cutter sharpener | |
| CN207272921U (en) | High rotating speed closed type static pressure rotary table | |
| CN209407673U (en) | A kind of thermoforming wheel hub laser welding displacement machine | |
| CN108253244A (en) | Hollow rotating platform | |
| CN205817590U (en) | Numerical control polishing vacuum absorption device | |
| CN208681071U (en) | A kind of rotary type vacuum absorption mold | |
| CN208409177U (en) | A kind of double back shaft precision stage | |
| CN206811722U (en) | A kind of foldable adjustable polishing machine | |
| CN102392820B (en) | Adverse-rotation-preventing scroll compressor with fixed eccentric disc | |
| CN211162551U (en) | Automatic welding equipment for axial flow fan impeller | |
| CN207824399U (en) | A kind of swinging process equipment | |
| CN104786070B (en) | Pressure ring of high-precision vertical working table base static-pressure seal structure | |
| CN214560018U (en) | Vacuum chuck for grinding end face of ceramic disc | |
| CN105983897A (en) | Grinding device for matching surface of ball body and ball seat | |
| CN206055114U (en) | Hollow rotating stage apparatus | |
| CN209078189U (en) | A kind of mechanical high speed contraposition assembly mechanism | |
| CN114017617B (en) | Compact harmonic reducer for monitoring cradle head and cradle head | |
| CN201519986U (en) | Five-shaft controlled water cutting head motion controlling mechanism with functions of rotation and deflection | |
| CN219986900U (en) | Clamp for pump cover production | |
| CN210304382U (en) | Rotary gluing platform | |
| CN211805532U (en) | Rotary working platform of grinding machine | |
| CN109175069A (en) | The wheel rim process equipment of aluminum-alloy wheel | |
| CN220806606U (en) | Plane grinding rotary table | |
| CN206185518U (en) | Saw revolving stage can incline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 311305 No. 68 Qingshan Avenue, Linan Economic Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Hangzhou Machinery Co., Ltd. Address before: 311305 No. 68 Qingshan Avenue, Linan Economic Development Zone, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Hangji Co., Ltd. |