CN104999048B - The booster-type locked mode hydraulic mechanism of heavy die casting machine - Google Patents
The booster-type locked mode hydraulic mechanism of heavy die casting machine Download PDFInfo
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- CN104999048B CN104999048B CN201510467732.6A CN201510467732A CN104999048B CN 104999048 B CN104999048 B CN 104999048B CN 201510467732 A CN201510467732 A CN 201510467732A CN 104999048 B CN104999048 B CN 104999048B
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Abstract
A kind of booster-type locked mode hydraulic mechanism of heavy die casting machine, including Mode-locking oil cylinder, pressurizing cylinder, locked mode inserted valve, supercharging oil return inserted valve, supercharging reset inserted valve, die sinking inserted valve, locked mode oil return inserted valve, locked mode electromagnetic direction valve, supercharging and reset electromagnetic direction valve, die sinking electromagnetic direction valve, locked mode check valve, die sinking oil return electromagnetic direction valve, die sinking oil return shuttle valve, die sinking oil return inserted valve, supercharging electromagnetic direction valve, supercharging inserted valve, supercharging and reset oil return inserted valve, device for detecting distance of travel and pipeline.The present invention starts with from the oil pressure in Mode-locking oil cylinder, on the premise of ensureing that system pressure is constant, change the pressure in Mode-locking oil cylinder by the way of supercharging, neither increasing oil pump capacity, on the basis of need not improving system pressure again, it is possible to increase operating efficiency, reduce energy consumption, reduction machine cost.The features such as it has simple and reasonable, dependable performance, easily low cost of manufacture, easily production, realization and high working efficiency, less energy consumption.
Description
Technical field
The present invention relates to a kind of heavy die casting machine, the booster-type locked mode hydraulic mechanism of specifically a kind of heavy die casting machine.
Background technology
Heavy die casting machine is steep to clamp force requirement to be increased, and its hydraulic system pressure keeps stable.Because Mode-locking oil cylinder is increased, it is
Lock opening speed is not allowed to decline obvious.Conventional method is to increase pumping plant output flow, and such as accompanying drawing 1 is a kind of common locked mode
Hydraulic mechanism schematic diagram, but this method defect is obvious：1st, power of motor need to be increased, hydraulic part and the pipes such as oil pump, fuel tap is increased
The specification on road etc., system design difficulty is substantially increased, 2, due to hardware improve, design and develop difficulty increasing, cause machine cost
Substantially increase, 3, because power of motor is increased, energy consumption also increases, and forms part and wastes, it is impossible to meets the use demand of user.Cause
This, it is necessary to further improve.
The content of the invention
The purpose of the present invention aims to provide a kind of simple and reasonable, dependable performance, low cost of manufacture, easily production, Yi Shi
Existing and high working efficiency, the booster-type locked mode hydraulic mechanism of the heavy die casting machine of less energy consumption, to overcome deficiency of the prior art
Part.
A kind of booster-type locked mode hydraulic mechanism of the heavy die casting machine designed by this purpose, it is characterised in that：Including locked mode
Oil cylinder, pressurizing cylinder, locked mode inserted valve, supercharging oil return inserted valve, supercharging reset inserted valve, die sinking inserted valve, locked mode oil return are inserted
Fill valve, locked mode electromagnetic direction valve, supercharging reset electromagnetic direction valve, die sinking electromagnetic direction valve, locked mode check valve, die sinking oil return electromagnetism
Direction valve, die sinking oil return shuttle valve, die sinking oil return inserted valve, supercharging electromagnetic direction valve, supercharging inserted valve, supercharging reset oil return inserting
Valve, device for detecting distance of travel and pipeline；The Mode-locking oil cylinder with pressurizing cylinder to be distributed up and down, and wherein Mode-locking oil cylinder is placed in
Side, pressurizing cylinder is placed below and the two head and the tail is connected.
The pressurizing cylinder is divided into two sections of size and is internally provided with charged piston, and charged piston is slidably arranged in supercharging
The big section of oil cylinder is interior and one end is connected with supercharging piston rod, and the other end is connected with detection bar, and supercharging piston rod is slidably arranged in increasing
In the segment of compressing cylinder, detection bar stretch out pressurizing cylinder outside, be additionally provided with inside pressurizing cylinder build pressure chamber, supercharging oil back chamber and
It is pressurized oil suction chamber；Described Mode-locking oil cylinder is internally provided with locking piston bar, locked mode rodless cavity and locked mode rod chamber, pressurizing cylinder
Segment connected with locked mode rodless cavity.
The A mouths of the die sinking oil return inserted valve are connected with locked mode rodless cavity, and B mouthfuls connect with fuel tank；Mold oil return electromagnetism side
Connected to the B holes of valve with molding the control mouth of oil return shuttle valve；Mold the pressure port and locked mode rodless cavity of oil return shuttle valve connection valve element
It is connected state in its natural state；The spool chamber of described die sinking oil return inserted valve is being molded when electromagnetic direction valve obtains electric with locking
Mould rodless cavity disconnect and connect with fuel tank, die sinking oil return inserted valve its A mouthfuls by certain pressure when realization automatically open up.
The die sinking inserted valve is connected with locked mode oil return inserted valve and the two is controlled by die sinking electromagnetic direction valve；Wherein,
The A holes for molding electromagnetic direction valve are connected with molding the core cavity of inserted valve, and B holes are connected with the core cavity of locked mode oil return inserted valve；Die sinking
The A mouths of inserted valve are connected with the A mouths of locked mode oil return inserted valve and connected after the two connection with the locked mode rod chamber of Mode-locking oil cylinder.
The supercharging oil return inserted valve is connected with supercharging reset inserted valve and the two is resetted electromagnetic direction valve by supercharging and controlled
System；Wherein, supercharging resets the A holes of electromagnetic direction valve and connected with being pressurized the spool chamber of reset inserted valve, B holes and supercharging oil return inserting
The spool chamber connection of valve；Supercharging reset inserted valve A mouths with supercharging oil return inserted valve A mouths connect and the two connect after with increasing
The supercharging oil back chamber connection of compressing cylinder.
The supercharging inserted valve is connected with supercharging reset oil return inserted valve and the two is controlled by supercharging electromagnetic direction valve；
Wherein, the A holes of supercharging electromagnetic direction valve are connected with being pressurized the spool chamber of inserted valve, and B holes reset the valve of oil return inserted valve with supercharging
Core cavity is connected；With pressurizing cylinder after being pressurized the A mouths of inserted valve and the A mouths of supercharging reset oil return inserted valve being connected and the two is connected
Supercharging oil suction chamber connection.
The locked mode inserted valve is controlled by locked mode electromagnetic direction valve；Wherein, the A holes of locked mode electromagnetic direction valve are inserted with locked mode
The spool chamber connection of valve is filled, the A mouths of locked mode inserted valve are connected with locked mode check valve, the oil-out and Mode-locking oil cylinder of locked mode check valve
Locked mode rodless cavity connection.
The pressurizing cylinder is internally provided with charged piston, and charged piston left end is connected with supercharging piston rod, right-hand member connection
There is detection bar；Described device for detecting distance of travel is arranged in detection bar and determines that supercharging is lived by detecting the stroke of detection bar
Whether plug resets.
The present invention is started with by the improvement of said structure from the oil pressure in Mode-locking oil cylinder, is ensureing that system pressure is constant
On the premise of, change the pressure in Mode-locking oil cylinder by the way of supercharging, neither increasing oil pump capacity, need not improve again and be
On the basis of system pressure, it is possible to increase operating efficiency, reduction energy consumption, reduction machine cost.It has simple and reasonable, performance
It is the features such as reliability, easily low cost of manufacture, easily production, realization and high working efficiency, less energy consumption, practical.
Brief description of the drawings
Fig. 1 is a structure principle chart of prior art.
Fig. 2 is one embodiment of the invention structure principle chart.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
Referring to Fig. 2, the booster-type locked mode hydraulic mechanism of this heavy die casting machine, including Mode-locking oil cylinder F1, pressurizing cylinder F2, lock
Mould inserted valve V1, supercharging oil return inserted valve V2, supercharging reset inserted valve V3, die sinking inserted valve V4, locked mode oil return inserted valve V5, lock
Mould electromagnetic direction valve V6, supercharging reset electromagnetic direction valve V7, die sinking electromagnetic direction valve V8, locked mode check valve V9, die sinking oil return electricity
Magnetic direction valve V10, die sinking oil return shuttle valve V11, die sinking oil return inserted valve V12, supercharging electromagnetic direction valve V14, supercharging inserted valve
V15, supercharging reset oil return inserted valve V16, device for detecting distance of travel C1 and pipeline.
Specifically, Mode-locking oil cylinder F1 and pressurizing cylinder F2 is is distributed up and down, and wherein Mode-locking oil cylinder F1 is placed in top, supercharging
Oil cylinder F2 is placed below and the two head and the tail is connected；Described pressurizing cylinder F2 is divided to for two sections of size and is internally provided with supercharging work
Plug 1, charged piston 1 is slidably arranged in pressurizing cylinder F2 big section and one end is connected with supercharging piston rod 2, other end connection
There is detection bar 3, supercharging piston rod 2 is slidably arranged in pressurizing cylinder F2 segment, detection bar 3 is stretched out outside pressurizing cylinder F2, increase
It is additionally provided with inside compressing cylinder F2 and builds pressure chamber 7, supercharging oil back chamber 8 and supercharging oil suction chamber 9；Set inside described Mode-locking oil cylinder F1
Locking piston bar 4, locked mode rodless cavity 5 and locked mode rod chamber 6 are equipped with, pressurizing cylinder F2 segment is connected with locked mode rodless cavity 5.
Die sinking oil return inserted valve V12 A mouths are connected with locked mode rodless cavity 5, and B mouthfuls connect with fuel tank；Mold oil return electromagnetism side
Connected to valve V10 B holes with molding oil return shuttle valve V11 control mouth；Mold the pressure port and lock of oil return shuttle valve V11 connection valve elements
Mould rodless cavity 5 is connected state in its natural state；Described die sinking oil return inserted valve V12 spool chamber is in die sinking electromagnetism direction
Disconnect and connected with fuel tank with locked mode rodless cavity 5 when valve V10 obtains electric, die sinking oil return inserted valve V12 is at its A mouthfuls by a level pressure
Realize and automatically open up during power.
More particularly, remained off always under die sinking oil return inserted valve V12 normal conditions.Only when die sinking electromagnetism
When direction valve V10 obtains electric, die sinking oil return inserted valve V12 spool chamber disconnects with Mode-locking oil cylinder F1 locked mode rodless cavity 5 immediately,
And connected with fuel tank, so, die sinking oil return inserted valve V12 its A mouthfuls by certain pressure when can then open.
In said structure, die sinking inserted valve V4 is connected with locked mode oil return inserted valve V5 and the two is by die sinking electromagnetic direction valve
V8 control；Wherein, die sinking electromagnetic direction valve V8 A holes are connected with molding inserted valve V4 core cavity, and B holes are inserted with locked mode oil return
Valve V5 core cavity connection；Die sinking inserted valve V4 A mouths connected with locked mode oil return inserted valve V5 A mouths and the two connect after with lock
Mould oil cylinder F1 locked mode rod chamber 6 is connected.
Supercharging oil return inserted valve V2 is connected with supercharging reset inserted valve V3 and the two is resetted electromagnetic direction valve V7's by supercharging
Control；Wherein, supercharging resets electromagnetic direction valve V7 A holes and connected with being pressurized reset inserted valve V3 spool chamber, and B holes are with being pressurized back
Oily inserted valve V2 spool chamber connection；A mouths that supercharging resets inserted valve V3 is connected and two with supercharging oil return inserted valve V2 A mouths
Connected after person's connection with pressurizing cylinder F2 supercharging oil back chamber 8.
Supercharging inserted valve V15 is connected with supercharging reset oil return inserted valve V16 and the two is by supercharging electromagnetic direction valve V14's
Control；Wherein, supercharging electromagnetic direction valve V14 A holes are connected with being pressurized inserted valve V15 spool chamber, and B holes reset oil return with supercharging
Inserted valve V16 spool chamber connection；Supercharging inserted valve V15 A mouths is connected with being pressurized reset oil return inserted valve V16 A mouths and two
Connected after person's connection with pressurizing cylinder F2 supercharging oil suction chamber 9.
Locked mode inserted valve V1 is controlled by locked mode electromagnetic direction valve V6；Wherein, locked mode electromagnetic direction valve V6 A holes and locked mode
Inserted valve V1 spool chamber connection, locked mode inserted valve V1 A mouths are connected with locked mode check valve V9, locked mode check valve V9 oil-out
Connected with Mode-locking oil cylinder F1 locked mode rodless cavity 5.
Pressurizing cylinder F2 is internally provided with charged piston 1, and the left end of charged piston 1 is connected with supercharging piston rod 2, right-hand member connection
There is detection bar 3；Described device for detecting distance of travel C1 is arranged in detection bar 3 and determines to increase by detecting the stroke of detection bar 3
Whether pressure piston 1 resets.
Its implementation process：
Mode-locking oil cylinder F1 diameter is smaller, and pressurizing cylinder F2's is relatively large in diameter, (this rank only in locked mode high pressure section
Duan Yaoqiu pressure ratio systems pressure is high), charged piston 1 is just moved.According to supercharging principle, Mode-locking oil cylinder F1 locked mode rodless cavity 5
Pressure increase, so as to reach the effect of supercharging locked mode.
This hydraulic mechanism is widely used for inserted valve loop, and each operating mode implementation process is analyzed as follows：
1st, when locked mode is acted at a slow speed：
Locked mode electromagnetic direction valve V6 obtains electric so that locked mode inserted valve V1 spool chamber connection fuel tank, in system pressure fluid
In the presence of so that locked mode inserted valve V1 spool chamber fluid returns to fuel tank, and at this moment locked mode inserted valve V1 valve element is opened, system
Pressure oil liquid passes through locked mode check valve V9, finally enters Mode-locking oil cylinder F1 locked mode rodless cavity 5, and system pressure fluid promotes locked mode
Piston rod 4 stretches out motion, carries out locked mode at a slow speed.
Simultaneously, the Mode-locking oil cylinder F1 fluid of locked mode rod chamber 6 flows back to fuel tank by locked mode oil return inserted valve V5.
2nd, during quick locked mode action：
Locked mode electromagnetic direction valve V6 and die sinking electromagnetic direction valve V8 it is electric, locked mode oil return inserted valve V5 spool chamber is with being
System and is closed oil communication, locked mode inserted valve V1 spool chamber fluid and is molded inserted valve V4 spool chamber fluid and is connected fuel tank,
In the presence of system pressure fluid, locked mode inserted valve V1 valve element and die sinking inserted valve V4 valve element are opened, Mode-locking oil cylinder F1
Locked mode rod chamber 6 connected with locked mode rodless cavity 5.Result in formation of differential circuit, quick locked mode action is realized.
3rd, during the action of supercharging locked mode：
Locked mode electromagnetic direction valve V6 and supercharging electromagnetic direction valve V14 obtain electric, locked mode inserted valve V1 spool chamber fluid and increasing
Press inserted valve V15 spool chamber fluid connection fuel tank, in the presence of system pressure fluid, locked mode inserted valve V1 valve element and increasing
Inserted valve V15 valve element is pressed to open, the spool chamber that supercharging resets oil return inserted valve V16 is connected with system oil-way, and supercharging resets back
Oily inserted valve V16 valve element keeps closing, and system pressure fluid enters pressurizing cylinder F2 supercharging oil-feed through being pressurized inserted valve V15
Chamber 9, promotes charged piston 1 to realize supercharging locked mode.
When the 4th, molding：
Supercharging resets electromagnetic direction valve V7 and die sinking electromagnetic direction valve V8 obtains electric, and similarly, system pressure fluid is multiple through supercharging
Position inserted valve V3 enters pressurizing cylinder F2 supercharging oil back chamber 8, promotes charged piston 1 to reset, system pressure fluid is inserted through die sinking
The locking piston bar 4 that valve V4 enters Mode-locking oil cylinder F1 is filled, promotes locking piston bar 4 to reset, realizes die sinking；Simultaneously, mold
Oil return electromagnetic direction valve V10 obtains electric, and system pressure enters die sinking oil return shuttle valve V11 control mouth so that die sinking oil return inserted valve
V12 spool chamber disconnects with Mode-locking oil cylinder F1 locked mode rodless cavity 5 and connected with fuel tank, in the effect of the fluid of locked mode rodless cavity 5
Under, die sinking oil return inserted valve V12 valve element is opened, and the fluid of locked mode rodless cavity 5 flows back to fuel tank through molding oil return inserted valve V12.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of this area
Personnel should be recognized that the present invention is not limited to the above embodiments, simply illustrate this hair described in above-described embodiment and specification
Bright principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these changes
It all fall within the protetion scope of the claimed invention with improvement.The claimed scope of the invention is by appending claims and its waits
Jljl is defined.
Claims (2)
1. a kind of booster-type locked mode hydraulic mechanism of heavy die casting machine, it is characterised in that：Including Mode-locking oil cylinder (F1), pressurizing cylinder
(F2), locked mode inserted valve (V1), supercharging oil return inserted valve (V2), supercharging reset inserted valve (V3), die sinking inserted valve (V4), locked mode
Oil return inserted valve (V5), locked mode electromagnetic direction valve (V6), supercharging reset electromagnetic direction valve (V7), die sinking electromagnetic direction valve (V8),
Locked mode check valve (V9), die sinking oil return electromagnetic direction valve (V10), die sinking oil return shuttle valve (V11), die sinking oil return inserted valve (V12),
It is pressurized electromagnetic direction valve (V14), supercharging inserted valve (V15), supercharging reset oil return inserted valve (V16), device for detecting distance of travel (C1)
And pipeline；The Mode-locking oil cylinder (F1) with pressurizing cylinder (F2) to be distributed up and down, and wherein Mode-locking oil cylinder (F1) is placed in top, increases
Compressing cylinder (F2) is placed below and the two head and the tail is connected；
The pressurizing cylinder (F2) is divided into two sections of size and is internally provided with charged piston (1), and charged piston (1), which is slided, to be set
In the big section of pressurizing cylinder (F2) and one end is connected with supercharging piston rod (2), the other end is connected with detection bar (3), and supercharging is lived
Stopper rod (2) is slidably arranged in pressurizing cylinder (F2) segment, and detection bar (3) stretches out pressurizing cylinder (F2) outside, pressurizing cylinder
(F2) internal be additionally provided with builds pressure chamber (7), supercharging oil back chamber (8) and supercharging oil suction chamber (9)；In described Mode-locking oil cylinder (F1)
Portion is provided with locking piston bar (4), locked mode rodless cavity (5) and locked mode rod chamber (6), the segment of pressurizing cylinder (F2) and locked mode without
Rod cavity (5) is connected；
The A mouths of the die sinking oil return inserted valve (V12) are connected with locked mode rodless cavity (5), and B mouthfuls connect with fuel tank；Mold oil return electricity
The B holes of magnetic direction valve (V10) are connected with the control mouth of die sinking oil return shuttle valve (V11)；Mold oil return shuttle valve (V11) connection valve element
Pressure port is connected state in its natural state with locked mode rodless cavity (5)；The spool chamber of described die sinking oil return inserted valve (V12)
Disconnect and connected with fuel tank with locked mode rodless cavity (5) when electromagnetic direction valve (V10) obtains electric molding, mold oil return inserted valve
(V12) its A mouthfuls by certain pressure when realize automatically open up；
The die sinking inserted valve (V4) connects with locked mode oil return inserted valve (V5) and the two is by the control for molding electromagnetic direction valve (V8)
System；Wherein, the A holes of die sinking electromagnetic direction valve (V8) are connected with the core cavity of die sinking inserted valve (V4), B holes and locked mode oil return inserted valve
(V5) core cavity connection；The A mouths of die sinking inserted valve (V4) are connected with the A mouths of locked mode oil return inserted valve (V5) and after the two connection
Connected with the locked mode rod chamber (6) of Mode-locking oil cylinder (F1)；
The supercharging oil return inserted valve (V2) is connected with supercharging reset inserted valve (V3) and the two is resetted electromagnetic direction valve by supercharging
(V7) control；Wherein, the A holes of supercharging reset electromagnetic direction valve (V7) are connected with the spool chamber that supercharging resets inserted valve (V3),
B holes are connected with the spool chamber of supercharging oil return inserted valve (V2)；Supercharging resets the A mouths and supercharging oil return inserted valve of inserted valve (V3)
(V2) connected after the connection of A mouths and the two connection with the supercharging oil back chamber (8) of pressurizing cylinder (F2)；
The supercharging inserted valve (V15) connects with supercharging reset oil return inserted valve (V16) and the two is by supercharging electromagnetic direction valve
(V14) control；Wherein, supercharging electromagnetic direction valve (V14) A holes with supercharging inserted valve (V15) spool chamber connect, B holes and
Supercharging resets the spool chamber connection of oil return inserted valve (V16)；The A mouths and supercharging for being pressurized inserted valve (V15) reset oil return inserted valve
(V16) connected after the connection of A mouths and the two connection with the supercharging oil suction chamber (9) of pressurizing cylinder (F2)；
Control of the locked mode inserted valve (V1) by locked mode electromagnetic direction valve (V6)；Wherein, the A holes of locked mode electromagnetic direction valve (V6)
Connected with the spool chamber of locked mode inserted valve (V1), the A mouths of locked mode inserted valve (V1) are connected with locked mode check valve (V9), and locked mode is unidirectional
The oil-out of valve (V9) is connected with the locked mode rodless cavity (5) of Mode-locking oil cylinder (F1).
2. the booster-type locked mode hydraulic mechanism of heavy die casting machine according to claim 1, it is characterised in that：The pressurizing cylinder
(F2) charged piston (1) is internally provided with, charged piston (1) left end is connected with supercharging piston rod (2), and right-hand member is connected with detection bar
(3)；Described device for detecting distance of travel (C1) is arranged in detection bar (3) and determines to increase by detecting the stroke of detection bar (3)
Whether pressure piston (1) resets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510467732.6A CN104999048B (en) | 2015-07-31 | 2015-07-31 | The booster-type locked mode hydraulic mechanism of heavy die casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510467732.6A CN104999048B (en) | 2015-07-31 | 2015-07-31 | The booster-type locked mode hydraulic mechanism of heavy die casting machine |
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| CN104999048A CN104999048A (en) | 2015-10-28 |
| CN104999048B true CN104999048B (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510467732.6A Active CN104999048B (en) | 2015-07-31 | 2015-07-31 | The booster-type locked mode hydraulic mechanism of heavy die casting machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649547A (en) * | 2021-08-24 | 2021-11-16 | 广东联升精密机械制造有限公司 | Die casting machine lock die sinking hydraulic system |
| CN114017427B (en) * | 2021-11-19 | 2024-08-27 | 中天钢铁集团有限公司 | Hydraulic system is cut to rod hydraulic pressure |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1058113A (en) * | 1996-08-23 | 1998-03-03 | U Mold:Kk | Method for adjusting flow rate in hydraulic apparatus and device therefor |
| CN202263914U (en) * | 2011-09-10 | 2012-06-06 | 李胜林 | Die-casting machine die-locking oil path system |
| CN203711803U (en) * | 2014-01-26 | 2014-07-16 | 东莞市益格机电有限公司 | Energy-saving die casting machine |
| CN204075146U (en) * | 2014-09-11 | 2015-01-07 | 东莞市锐风机械有限公司 | Die casting machine lock die sinking pressure charging system |
| CN204382610U (en) * | 2014-12-30 | 2015-06-10 | 北京理工大学 | Supplementary positive displacements etc. are accommodating changes clamping apparatus |
| CN204997037U (en) * | 2015-07-31 | 2016-01-27 | 广东伊之密精密机械股份有限公司 | Booster -type mode locking hydraulic pressure mechanism of heavy die casting machine |
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Address after: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee after: Yizhimi Co.,Ltd. Address before: 528300 Guangdong province Foshan city Shunde high tech Zone (Ronggui) No. 22 Keyuan Road three Patentee before: GUANGDONG YIZUMI PRECISION MACHINERY Co.,Ltd. |