CN107571117B - Marine diesel engine air valve and valve seat mating surface grinding method - Google Patents
Marine diesel engine air valve and valve seat mating surface grinding method Download PDFInfo
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- CN107571117B CN107571117B CN201710763386.5A CN201710763386A CN107571117B CN 107571117 B CN107571117 B CN 107571117B CN 201710763386 A CN201710763386 A CN 201710763386A CN 107571117 B CN107571117 B CN 107571117B
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- air valve
- clast
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- 230000013011 mating Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 15
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims abstract description 20
- 238000010926 purge Methods 0.000 claims abstract description 6
- 230000003028 elevating effect Effects 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 7
- 238000005498 polishing Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The present invention discloses a kind of marine diesel engine air valve and valve seat mating surface grinding method, it needs using a kind of grinding device, the following steps are included: A, polishing: to main ventilated inside gas pipe, the first turbine band moving cam is rotated, and cam will push air valve opposite valve seat and slide above and below；B, purge: main endotracheal gas is flowed into jet ring tube, and gas is injected between air valve and valve seat by spray head, and is purged to friction clast；C, remove clast: the second turbine drives the rotation of negative pressure blade, forms negative pressure at negative pressure blade, and clast is drawn into air scoop, clast is flowed into filter along air scoop, and filter is filtered removal to clast；Compared with prior art, this programme passes through the setting of the second turbine, negative pressure blade and jet ring tube, reduces the abrasion between air valve and valve seat mating surface, so that working environment is cleaner and tidier, ensure that the health of operator.
Description
Technical field
The present invention relates to technical field of diesel engine production, specially marine diesel engine air valve and valve seat mating surface grinding side
Method.
Background technique
When boat diesel engine works, inlet and outlet valve seat is in the adverse circumstances of high temperature and pressure, still suffers from rushing for air valve
Load is hit, alternation mechanical stress and deformation are thus generated, causes air valve and the contact surface of valve seat that relative displacement occurs, while in air valve
And valve base surface there is also the defects of abrasion, point, dent and slight crack, these defects destroy the sealing of air valve and valve seat
Property, affect the normal operation of diesel engine.Therefore when to large-sized diesel machine overhauling, the reparation of inlet and outlet valve and valve seat is one
The very important work of item.
In order to guarantee the leakproofness of air valve and valve seat, the mating surface of air valve and valve seat is ground.Currently, for big
For type low speed marine diesel engine, since its air valve valve rod is longer (about mono- 2000mm of 700mm or so), weight is in 180-
Cylinder head is usually placed on on fixed pivot bracket, utilizes lever principle, operator's pedal lever by 350 Kg or so
Master arm is freely fallen after so that the air valve valve rod connecting with lever slave arm is raised certain altitude, realizes matching for air valve and valve seat
The grinding in conjunction face.But above-mentioned lapping mode, needs operator to work without cessation, and the labour for not only increasing operator is strong
Degree, and as operator works without cessation, operator can be more and more tired, and the speed of polishing can be gradually slack-off, so that
Working efficiency greatly reduces.
In order to solve problem above, the utility model patent that Chinese Patent Application No. is 201320869136.7, discloses
A kind of large ship diesel valve and valve seat mating surface grinding method, it includes motor and deceleration mechanism, cam drive machine
Structure, motor control mechanism and support frame, support frame are equipped with pedestal, support column and table top, and table top is equipped with air valve valve rod and passes through hole,
Motor and deceleration mechanism are mounted on the base, and cam drive is mounted on motor and the output shaft of deceleration mechanism.The program
When grinding to large-scale diesel engine air valve and valve seat mating surface, diesel engine cylinder head is first fixedly mounted on to the table top of support frame
On, then diesel valve valve rod passed through into the valve seat orifice on diesel engine cylinder head, outside the cam for making its end and cam drive
Profile face contact passes through cam outer surface and drives air valve valve when motor and the drive cam drive rotation of deceleration mechanism
Bar moves upwards, and then falls by the self weight of air valve, is achieved in the grinding of air valve Yu valve seat mating surface.
Above scheme passes through the setting of cam drive and motor, realizes air valve and the automation of valve seat mating surface is beaten
Mill, not only reduces the labor intensity of operator, also improves working efficiency, but this device still has following problems:
When air valve and valve seat mating surface are ground, the clast being ground will be dropped into valve seat or on table top, and clast can not carry out clearly
Reason, one side clast will increase the abrasion between air valve and valve seat mating surface, even when air valve and valve seat mating surface act on
So that dent occur in air valve and valve seat mating surface, one side clast is slid on table top, it will the working environment of contamination grinding, portion
Morcelling bits will swim among air, also will affect the health of operator.
Summary of the invention
The purpose of the present invention is to provide one kind can reduce the abrasion between air valve and valve seat mating surface, avoids air valve and valve
There is dent when seat mating surface grinding, and the tidiness of working environment can be improved, guarantees that the ship of operator's health is used
Diesel valve and valve seat mating surface grinding method.
Marine diesel engine air valve and valve seat mating surface grinding method in this programme, need using a kind of grinding device,
Cam including rack and for offseting with air valve valve rod, rack are equipped with the fixed mechanism for fixed valve base, open in rack
There is the aperture passed through for air valve valve rod, cam rotation connection is fixed with main tracheae, main intratracheal rotation on the rack, in rack
It is connected with the first turbine and the second turbine, cam coaxial is mutually connected on the first turbine, and the second turbine is coaxially connected with negative pressure blade,
Negative pressure blade is rotatably arranged in air scoop, and venthole is provided on air scoop, and filter is communicated on venthole, and negative pressure blade is same
Axis is connected with jet ring tube, and jet ring tube is located at the lower section of negative pressure blade, is communicated with spray head, spray head on the inside of jet ring tube
Towards air valve and valve seat mating surface, clamping rings pipe is communicated on jet ring tube, jet ring tube is rotatably connected on fixed circle
On endless tube, clamping rings pipe is fixed on the rack, the connection of clamping rings Guan Yuzhu tracheae；
The following steps are included:
A, polish: to main ventilated inside gas pipe, the first turbine band moving cam is rotated, cam will push on air valve opposite valve seat,
Lower slider；
B, purge: main endotracheal gas is flowed into jet ring tube, and gas is injected to air valve and valve seat by spray head
Between, and friction clast is purged；
C, remove clast: the second turbine drives the rotation of negative pressure blade, forms negative pressure at negative pressure blade, and clast is drawn into and is led
In gas hood, clast is flowed into filter along air scoop, and filter is filtered removal to clast.
The technical principle of this programme are as follows: rack is used to support whole device for placing air valve and valve seat, fixed mechanism
For valve seat to be fixed on the rack, after fixing valve seat, air valve valve rod is inserted into for passing through air valve valve rod for aperture
In valve seat, air valve valve rod passes through aperture, and air valve valve rod bottom end will offset with cam.
A, it polishes: ventilating to main tracheae, gas will drive the first turbine rotation, and the first turbine band moving cam rotates,
Cam is cooperated with air valve valve rod self gravity so that air valve valve rod does upper and lower reciprocally movement, thus formed air valve with
Valve seat mating surface grinding operation.
B, purge: gas can drive the second turbine rotation again, and the second turbine drives the rotation of negative pressure blade, and negative pressure blade drives
The rotation of jet ring tube, jet ring tube are connected to clamping rings pipe, and main tracheae is connected to clamping rings pipe again, and gas will pass through
Clamping rings pipe enters in jet ring tube, and is injected on air valve and valve seat mating surface from spray head, and because of jet annulus
Pipe is rotation, and spray head can purge air valve and the entire circumferential direction of valve seat mating surface, everywhere in air valve and valve seat mating surface
It can be purged to, so that clast be removed completely, to reduce the abrasion between air valve and valve seat mating surface, it is therefore prevented that gas
There is dent because of friction clast in valve and valve seat mating surface.
C, remove clast: the second turbine drives the rotation of negative pressure blade, forms negative pressure at negative pressure blade, it will purged broken
Bits are drawn into air scoop, and gas will be flowed out with clast from the outlet of air scoop, and be flowed into filter, and filter is to clast
It is filtered, filtered clean gas, is discharged from the outlet of filter, it is therefore prevented that clast floats in air and influences operation
The health of personnel.
Compared with prior art, this programme have the beneficial effect that this programme by the second turbine, negative pressure blade and jet circle
The clast being ground can be carried out purge, and clast is carried out guiding discharge by negative pressure by the setting of endless tube, avoid gas
The presence of valve and valve seat mating surface clast, reduces the abrasion between air valve and valve seat mating surface, it is therefore prevented that the appearance of dent,
Clast is prevented to be slipped in rack, so that working environment is cleaner and tidier, it is therefore prevented that the floating of clast ensure that the body of operator
Body health.
Further, further including the vibrating mechanism for vibrating valve seat, vibrating mechanism includes the fan of rotation connection on the rack
Gear and the rack gear being slidably connected on the rack, elevating arc and rack gear intermeshing, are connected between one end and rack of rack gear
First spring, the other end and the valve seat of rack gear offset.Elevating arc is rotated, elevating arc will intermittently be engaged with rack, and work as elevating arc
When being engaged with rack, rack gear is moved to the direction far from valve seat, and when elevating arc is disengaged from rack gear, the first spring will be pushed
Rack gear hits valve seat, and valve seat will generate vibration, stick in clast on valve seat and vibrate from valve seat, clast be purged out immediately
It goes, so that clast removal is more clean.
Further, being fixedly connected with backing plate on one end that rack gear and valve seat offset, backing plate offsets with valve seat.Backing plate is set
It sets, can prevent rack gear from directly contacting with valve seat, reduce the abrasion between rack gear and valve seat, to extend rack gear and valve seat
Service life.
Further, the tapping of rack is provided with the protective plate for offseting with air valve valve rod, between protective plate and rack
It is connected with second spring, protective plate bottom offsets with cam.The setting of protective plate can prevent cam from directly contacting with protective plate,
It avoids cam air valve valve rod is caused to wear, to extend the service life of air valve valve rod.
Further, the gas outlet of filter is communicated with escape pipe, escape pipe extend into valve seat and air valve stem bottom is slided
At the cooperation of connection.Here by escape pipe setting, the clean gas filtered out is blown into valve seat and air valve stem bottom is sliding
At the cooperation of dynamic connection, and the gap between valve seat and air valve valve rod is flow in air valve and valve seat mating surface, can will be fallen
Enter to the clast between valve seat and air valve valve rod and blow down, so that clast removal is more clean, ensure that air valve and valve seat cooperate
Face grinding quality.
Further, spray head is several, several spray heads are circumferentially evenly arranged on the inside of jet ring tube.So that gas can be with
It is more uniformly blown into air valve and valve seat mating surface, so that clast removal is more clean.
Detailed description of the invention
Fig. 1 is a kind of grinding device in marine diesel engine air valve of the present invention and valve seat mating surface grinding method embodiment
Schematic diagram；
Fig. 2 is the schematic diagram of jet ring tube in Fig. 1, clamping rings pipe and spray head cooperation.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail:
Appended drawing reference in Figure of description include: rack 1, air pump 2, cam 3, protective plate 4, air valve valve rod 5, valve seat 6,
Jet ring tube 7, clamping rings pipe 8, negative pressure blade 9, rack gear 10, elevating arc 11, filter 12, spray head 13.
Substantially referring to fig. 1 and fig. 2, marine diesel engine air valve and valve seat mating surface grinding method need embodiment
Using a kind of grinding device, including rack 1, the card slot for fixed valve base 6 is provided in rack 1, sliding setting clamps in card slot
Plate is connected with the 5th spring between clamping plate and card slot, card slot internal screw thread is connected with screw rod, and screw rod offsets with clamping plate, rack 1
It is equipped with the fixed mechanism for fixed valve base 6, is provided with the aperture passed through for air valve valve rod 5, the aperture of rack 1 in rack 1
Place is provided with the protective plate 4 for offseting with air valve valve rod 5, and second spring, protective plate 4 are connected between protective plate 4 and rack 1
Bottom mutually has cam 3, and cam 3 is rotatably connected in rack 1, and air pump 2 has been bolted in rack 1, and air pump 2 is communicated with
Main tracheae, master are intratracheally rotatably connected to the first turbine and the second turbine, and cam 3 is coaxially mutually connected on the first turbine, the second whirlpool
Wheel is coaxially connected with negative pressure blade 9, and negative pressure blade 9 is rotatably arranged in air scoop, is provided with venthole on air scoop, on venthole
It is communicated with filter 12, the gas outlet of filter 12 is communicated with escape pipe, and escape pipe extend into valve seat 6 and 5 bottom of air valve valve rod
At the cooperation being slidably connected, negative pressure blade 9 is coaxially connected with jet ring tube 7, and jet ring tube 7 is located under negative pressure blade 9
Side, is communicated with ten spray heads 13 on the inside of jet ring tube 7, the circumferential inside for being evenly arranged on jet ring tube 7 of ten spray heads 13, and ten
Spray head 13 is communicated with clamping rings pipe 8 towards air valve and 6 mating surface of valve seat on jet ring tube 7, jet ring tube 7 rotates
It being connected on clamping rings pipe 8, clamping rings pipe 8 is connected in rack 1 by clip, and clamping rings pipe 8 is connected to main tracheae,
The vibrating mechanism for vibrating valve seat 6 is provided in rack 1, vibrating mechanism includes the elevating arc 11 being rotatably connected in rack 1
With the rack gear 10 being slidably connected in rack 1, elevating arc 11 and rack gear 10 are intermeshed, and are connected between 10 left end of rack gear and rack 1
It is connected to the first spring, backing plate is welded on 10 right end of rack gear, rack gear 10 is offseted by backing plate with valve seat 6.
In use, valve seat 6 is put into card slot, screw rod is screwed, screw rod pushes clamping plate that valve seat 6 is fixedly clamped, will
Air valve valve rod 5 is inserted into valve seat 6, and air valve valve rod 5 passes through aperture, and offsets with protective plate 4,4 bottom of protective plate and 3 phase of cam
It supports, booster air pump 2 ventilates to main tracheae, and gas will drive the first turbine and the rotation of the second worm gear, and the first turbine drives convex
3 rotation of wheel, cam 3 is cooperated with 5 self gravity of air valve valve rod, so that air valve valve rod 5 does upper and lower reciprocally movement, from
And form air valve and 6 mating surface grinding operation of valve seat；Gas can drive the second turbine rotation again, and the second turbine drives negative pressure blade
9 rotations, negative pressure blade 9 drive jet ring tube 7 to rotate, and gas will enter in jet ring tube 7 by clamping rings pipe 8,
And be injected on air valve and 6 mating surface of valve seat from spray head 13, and because jet ring tube 7 is rotation, ten spray heads 13 can be right
Air valve and the entire circumferential direction of 6 mating surface of valve seat are purged, and can be purged to everywhere in air valve and 6 mating surface of valve seat, negative pressure
Blade 9 rotates, it will and purged clast is drawn into air scoop, and gas will be flowed out with clast from the outlet of air scoop,
And flow into filter 12, filter 12 is filtered clast, filtered clean gas, arranges from the outlet of filter 12
Out, it and is drained at the cooperation that valve seat 6 is connect with 5 basal sliding of air valve valve rod, and between valve seat 6 and air valve valve rod 5
Gap is flow in air valve and 6 mating surface of valve seat, can be blown down the clast dropped between valve seat 6 and air valve valve rod 5, so that broken
Bits remove more clean.
During removing clast, elevating arc 11 is rotated, elevating arc 11 will be engaged intermittently with rack gear 10, work as elevating arc
11 with rack gear 10 when engaging, and rack gear 10 moves downward, and when elevating arc 11 and rack gear 10 are disengaged from, the first spring will push tooth
Item 10 moves right, and rack gear 10 drives backing plate to hit valve seat 6, and valve seat 6 will generate vibration, sticks on valve seat 6 clast from valve seat 6
Upper to vibrate, clast is purged out immediately.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (5)
1. marine diesel engine air valve and valve seat mating surface grinding method, which is characterized in that need using a kind of grinding device, packet
Including rack and cam for offseting with air valve valve rod, rack are equipped with the fixed mechanism for fixed valve base, are provided in rack
For the aperture that air valve valve rod passes through, cam rotation connection is fixed with main tracheae on the rack, in rack, and main intratracheal rotation connects
It is connected to the first turbine and the second turbine, cam coaxial is mutually connected on the first turbine, and the second turbine is coaxially connected with negative pressure blade, is born
Pressure blade is rotatably arranged in air scoop, and venthole is provided on air scoop, filter is communicated on venthole, negative pressure blade is coaxial
It is connected with jet ring tube, jet ring tube is located at the lower section of negative pressure blade, is communicated with spray head, spray head court on the inside of jet ring tube
To air valve and valve seat mating surface, clamping rings pipe is communicated on jet ring tube, jet ring tube is rotatably connected on clamping rings
Guan Shang, clamping rings pipe are fixed on the rack, and the connection of clamping rings Guan Yuzhu tracheae, further includes the bobbing machine for vibrating valve seat
Structure, vibrating mechanism include rotation connection elevating arc on the rack and the rack gear that is slidably connected on the rack, elevating arc and rack gear
Intermeshing, is connected with the first spring, the other end and the valve seat of rack gear offset between one end and rack of rack gear；
The following steps are included:
A, polish: to main ventilated inside gas pipe, the first turbine band moving cam is rotated, and cam will push air valve opposite valve seat and slide above and below
It is dynamic；
B, purge: main endotracheal gas is flowed into jet ring tube, and gas is injected between air valve and valve seat by spray head,
And friction clast is purged；
C, remove clast: the second turbine drives the rotation of negative pressure blade, forms negative pressure at negative pressure blade, and clast is drawn into air scoop
Interior, clast is flowed into filter along air scoop, and filter is filtered removal to clast.
2. marine diesel engine air valve according to claim 1 and valve seat mating surface grinding method, it is characterised in that: described
It is fixedly connected with backing plate on one end that rack gear and valve seat offset, backing plate offsets with valve seat.
3. marine diesel engine air valve according to claim 1 and valve seat mating surface grinding method, it is characterised in that: described
The tapping of rack is provided with the protective plate for offseting with air valve valve rod, and second spring is connected between protective plate and rack,
Protective plate bottom offsets with cam.
4. marine diesel engine air valve according to claim 1 and valve seat mating surface grinding method, it is characterised in that: described
The gas outlet of filter is communicated with escape pipe, and escape pipe is extend at the cooperation that valve seat is slidably connected with air valve stem bottom.
5. marine diesel engine air valve described in any one of -4 and valve seat mating surface grinding method according to claim 1, special
Sign is: the spray head is several, several spray heads are circumferentially evenly arranged on the inside of jet ring tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710763386.5A CN107571117B (en) | 2017-08-30 | 2017-08-30 | Marine diesel engine air valve and valve seat mating surface grinding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710763386.5A CN107571117B (en) | 2017-08-30 | 2017-08-30 | Marine diesel engine air valve and valve seat mating surface grinding method |
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| CN107571117A CN107571117A (en) | 2018-01-12 |
| CN107571117B true CN107571117B (en) | 2019-01-29 |
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| CN201710763386.5A Active CN107571117B (en) | 2017-08-30 | 2017-08-30 | Marine diesel engine air valve and valve seat mating surface grinding method |
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| CN110509144A (en) * | 2019-09-05 | 2019-11-29 | 滨州职业学院 | A kind of boat diesel engine grinding apparatus |
| CN112518515A (en) * | 2020-11-28 | 2021-03-19 | 浙江德清炜烨新材料股份有限公司 | Grinding device for refractory brick |
| CN114083013B (en) * | 2021-11-18 | 2024-03-29 | 徐州华之厚机械制造有限公司 | Drilling device for machine-building |
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| CN203680016U (en) * | 2013-12-27 | 2014-07-02 | 山海关船舶重工有限责任公司 | Grinding device for matching surfaces of air valve and valve seat of diesel engine for large ship |
| CN105458869A (en) * | 2015-12-29 | 2016-04-06 | 东北石油大学 | Conical face sealing pair grinding fit device with quantitative loading function |
| CN106363512A (en) * | 2016-08-28 | 2017-02-01 | 浙江春宝胶囊有限公司 | Capsule polishing and conveying device |
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2017
- 2017-08-30 CN CN201710763386.5A patent/CN107571117B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168118A (en) * | 1995-12-05 | 1997-12-17 | 罗伯特·博施有限公司 | Valve obturator and method and device for producing sealing surface on such obturator |
| CN101402180A (en) * | 2008-11-18 | 2009-04-08 | 北京精密机电控制设备研究所 | Auxiliary overlap joint hydraulic match grinding process for spool valve of servo valve |
| CN203380742U (en) * | 2013-08-13 | 2014-01-08 | 林永琪 | Dry type polishing table with automatic dedusting function |
| CN203680016U (en) * | 2013-12-27 | 2014-07-02 | 山海关船舶重工有限责任公司 | Grinding device for matching surfaces of air valve and valve seat of diesel engine for large ship |
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| CN107571117A (en) | 2018-01-12 |
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Effective date of registration: 20191023 Address after: 102600 Unit 403, Unit 1, 15th Floor, Changfengyuan, Huangcun Town, Daxing District, Beijing Patentee after: Du Lihong Address before: 402160 No. 65 South Railway Station, Yongchuan District, Chongqing Patentee before: CHONGQING YONGCHUAN DISTRICT TAIXING MACHINERY FACTORY |
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Address after: 210000 Shui Gang No. 6, Gulou District, Nanjing, Jiangsu Patentee after: Du Lihong Address before: 102600 Unit 403, Unit 1, 15th Floor, Changfengyuan, Huangcun Town, Daxing District, Beijing Patentee before: Du Lihong |
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Address after: 241000 green food Economic Development Zone, three mountains, Anhui, Wuhu Patentee after: Du Lihong Address before: 210000 Shui Gang No. 6, Gulou District, Nanjing, Jiangsu Patentee before: Du Lihong |
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| TR01 | Transfer of patent right |
Effective date of registration: 20201221 Address after: 276800 Room 201, 119 Shanghai Road, Rizhao Economic Development Zone, Shandong Province Patentee after: SUNUP MARINE ENGINEERING Co.,Ltd. Address before: 241000 green food Economic Development Zone, Sanshan District, Wuhu City, Anhui Province Patentee before: Du Lihong |