CN100582540C - Limit flow hydraulic valve - Google Patents
Limit flow hydraulic valve Download PDFInfo
- Publication number
- CN100582540C CN100582540C CN200810012549A CN200810012549A CN100582540C CN 100582540 C CN100582540 C CN 100582540C CN 200810012549 A CN200810012549 A CN 200810012549A CN 200810012549 A CN200810012549 A CN 200810012549A CN 100582540 C CN100582540 C CN 100582540C
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- valve
- back pressure
- way valve
- valve body
- spool
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Abstract
A limit hydraulic valve comprises a valve body, a valve plug of a one-way valve, a limit adjustable throttle valve, a standby adjustable throttle valve, a liquid cavity of the valve body of the one-way valve and a rodless cavity of a hydraulic cylinder. The limit hydraulic valve is characterized in that a valve plug of a back pressure valve is arranged in the valve plug of the one-way valve, a returning spring of the back pressure valve is arranged in the valve plug of the back pressure valve, a gland bush is arranged at the bottom of the valve plug of the back pressure valve; a ring-shaped piston is arranged on the periphery of the lower end of the valve plug of the one-way valve and integrated with the valve plug of the one-way valve, and is in clearance fit with the inner wall of the valve body; and a valve body end cover is arranged at the bottom of the valve body; an axial frustum-shaped thimble is fixed in the center of the valve body end cover. The limit hydraulic valve can limit the volume of a liquid needed in the movement process of the execution system of a hydraulic system, and can also automatically cut off the liquid supply of pressure source to the execution system when leakage occurs to the execution system of the hydraulic system. The hydraulic valve has the advantages of fewer parts of valve body, simple structure, environmental protection and reduced liquid consumption. The normal operation steps of the prior system are not added to the hydraulic valve.
Description
Technical field
The present invention relates to a kind of limit flow hydraulic valve in the hydraulic system, particularly a kind of can be under hydraulic system leak of liquid state automatically the cut-out pressure source to the limit flow hydraulic valve of executive system feed flow.
Background technique
At present, though the application of one-way throttle valve, pitching pile valve and limit flow hydraulic valve is arranged in the hydraulic system, but one-way throttle valve can only be realized single throttling function, can not under the leak of liquid state, cut off oil hydraulic circuit automatically, though and the pitching pile valve has the function of cutting off oil hydraulic circuit, can not oil hydraulic circuit have cut off oil hydraulic circuit under the press liquid leak condition automatically and to the executive system movement process in required limiting the quantity of of press liquid volume arranged.Existing limit flow hydraulic valve has only single manually opened back timing closing function, and this can not satisfy the demand for the executive system that needs voltage supply for a long time.For the leakage of hydraulic system liquid, the method that people generally take is used high voltage bearing seal ring of high quality and oil pipe exactly before this, strengthens preventive measures such as maintenance and maintenance.Under the situation that operator do not have to find for leaking, also there are not effective leak-proof measure and the limit flow hydraulic valve that drip-preventing function is arranged.
Summary of the invention:
When taking place to leak at existing hydrovalve hydraulic system, in time the cut-out pressure source is to the problem of executive system feed flow, the invention provides a kind of limit flow hydraulic valve, this limit flow hydraulic valve can not only have the press liquid volume to limit the quantity of to executive system is required in movement process, and can be when the executive system of hydraulic system takes place to leak automatic cut-out pressure source to the executive system feed flow.
A kind of limit flow hydraulic valve of the present invention, comprise valve body, the one-way valve spool, the adjustable restrictive valve of limiting the quantity of, standby adjustable restrictive valve, oil hydraulic cylinder rod chamber, one-way valve valve body fluid-through chamber and oil hydraulic cylinder rodless cavity, it is characterized in that being provided with the back pressure valve spool at the one-way valve in-core, be provided with the back pressure valve Returnning spring in the back pressure valve spool, back pressure valve spool bottom is provided with the back pressure valve gland; Periphery is provided with an annular piston in one-way valve spool lower end, become one with the one-way valve spool, and with the valve interior wall Spielpassung; Be provided with valve body end cap in the valve body bottom, the valve body end cap center fixation has axial taper type thimble.Described back pressure valve spool opening direction is opposite with one-way valve spool opening direction.Described taper type thimble top is over against the bottom centre position of back pressure valve spool, and the taper type thimble backs down the back pressure valve spool when the one-way valve spool is moved downward to the valve body end cap place.Described one-way valve spool upper end is processed with oil hydraulic cylinder rod chamber fluid infusion groove.Described valve body upper end is provided with inlet opening, is provided with liquid outlet opening on valve body end cap.When this limit flow hydraulic valve was connected with the side formula that is connected to of outside, the liquid inlet and outlet hole of its valve body was provided with the axis perpendicular to the one-way valve spool.
Be provided with one-way valve valve body inlet opening in the valve body upper end, one-way valve spool upper side evenly is provided with one-way valve spool hole radially, back pressure valve spool lower side evenly is provided with back pressure valve spool bore radially, be provided with the back pressure valve inlet opening at back pressure valve gland center, be provided with axial one-way valve valve body liquid outlet opening be positioned at thimble on valve body end cap around, one-way valve spool upper end is processed with oil hydraulic cylinder rod chamber fluid infusion groove.Being provided with stand-by channel I in a side of valve body communicates with standby adjustable restrictive valve, be provided with stand-by channel II between adjustable restrictive valve and the standby adjustable restrictive valve limiting the quantity of, be provided with the path of limiting the quantity of between adjustable restrictive valve and the oil hydraulic cylinder rod chamber limiting the quantity of, be provided with shared path between adjustable restrictive valve and the one-way valve valve body inlet opening limiting the quantity of.
One-way valve spool limit the quantity of adjustable restrictive valve and standby adjustable restrictive valve are housed in the valve body, the one-way valve in-core installs back pressure valve spool and back pressure valve Returnning spring additional, there is the back pressure valve gland at back pressure valve inlet opening place, the adjustable restrictive valve of limiting the quantity of links to each other the oil hydraulic cylinder rod chamber with shared path by the path of limiting the quantity of with one-way valve valve body inlet opening, standby adjustable restrictive valve links to each other the oil hydraulic cylinder rodless cavity with shared path by stand-by channel I, stand-by channel II with one-way valve valve body inlet opening.All under the complete opening state, one-way valve valve body inlet opening communicates with one-way valve valve body liquid outlet opening by one-way valve valve body fluid-through chamber, one-way valve spool hole, back pressure valve spool bore, back pressure valve inlet opening at one-way valve spool and back pressure valve spool.Be the reliability of guaranteeing that the one-way valve spool moves, the elastic force of back pressure valve Returnning spring can not be too little, is greater than the resistance of one-way valve spool when moving.
The present invention adopts the working principle of one-way valve, oil hydraulic cylinder and adjustable restrictive valve to combine.Hydraulic cylinder piston and straight check valve spool are combined, cylinder wall and straight check valve valve body are combined, the motion of hydraulic cylinder piston drives the motion of one-way valve spool, and hydraulic cylinder piston has replaced the Returnning spring in the one-way valve.Two working solution holes of improving the oil hydraulic cylinder of back formation link to each other with the hole into and out of liquid of former valve body homonymy respectively, and the motion of hydraulic cylinder piston is controlled automatically by the press liquid that has into and out of valve body.There has not been Returnning spring, when the one-way valve spool is in the enable possition, pressure drop is very little when having press liquid to flow through the one-way valve spool, for guaranteeing the reliability of valve core movement, be the reliability of hydraulic cylinder piston motor function, must make valve body into and out of liquid to produce the required liquid pressure of enough piston motions poor.Install reverse little one-way valve spool additional in the liquid outlet opening of the one-way valve spool after improvement (placing the hole of one-way valve Returnning spring originally) for this reason, because of use its back pressure function at this position, be the title of the big one-way valve spool of distinguishing it and its outside, name to it and be the back pressure valve spool.As press liquid by the valve body liquid outlet opening when the inlet opening direction flows, owing to installed back pressure valve additional in the nonreturn valve core, liquid can flow through from the one-way valve in-core by back pressure valve, it is poor to cause one-way valve spool its two ends under the effect of pressure flow body to produce the required liquid pressure of enough piston motions, the liquid pressure difference is the net sectional area of back pressure valve spring force divided by the back pressure valve spool, reaches piston promotion one-way valve spool and moves the purpose of closing path to valve body inlet opening direction.When liquid flowed round about, because back pressure valve is in closed condition, the one-way valve spool moved to valve body liquid outlet opening direction under the effect of liquid pressure difference, but liquid can not flow through from the one-way valve in-core by back pressure valve.For solving this technical problem, increase a taper type thimble at one-way valve valve body liquid outlet opening place, to guarantee that the one-way valve spool must move to the special position of valve body liquid outlet opening, thimble just can back down the back pressure valve spool, and liquid is flow through from the one-way valve in-core by back pressure valve.For controlling liquid flow through valve body volume what, must solve the one-way valve spool earlier and close the required time length of process, in former one-way valve inlet opening and path that hydraulic cylinder works liquid hole links to each other, install the adjustable restrictive valve of limiting the quantity of additional for this reason and carry out the speed that the controlling non-return valve spool is closed, thus reach folk prescription to control flows through what purpose of the volume of valve body liquid.When the flow of one-way valve inlet opening trickle moves institute can compression liquid-discharge body flow the time less than hydraulic cylinder piston and one-way valve spool, back pressure valve is in closed condition, and liquid can not flow through from the one-way valve in-core by back pressure valve.When the one-way valve spool moved to former one-way valve inlet opening place, the one-way valve spool was closed path, and automatic cut-out pressure source is to the purpose of executive system feed flow when reaching executive system generation leakage.
The invention has the beneficial effects as follows, can be in the executive system movement process to hydraulic system required have in the limiting the quantity of that the press liquid volume carries out, automatic cut-out pressure source is to the executive system feed flow in the time of also can taking place to leak in the executive system of hydraulic system, especially the executive component in the executive system needs the long-term voltage supply of pressure source and can not produce the slight leakage that is taken place under the state of motion (promptly only needing pressure not need flow), just move institute can compression liquid-discharge body flow the time less than hydraulic cylinder piston and one-way valve spool when the flow of one-way valve inlet opening trickle, also automatically the cut-out pressure source to the executive system feed flow.The liquid volume of leaking moves institute's energy compression liquid-discharge body volume by hydraulic cylinder piston in the valve and one-way valve spool, the volume size equal the interior hydraulic cylinder piston area of valve with it the product of mobile distance.Valve body piece is few, and is simple in structure, and function realizes automatically, can not increase the normal operation step of original system.Reduce liquid-consumed, the protection environment.
Description of drawings
Fig. 1 is a limit flow hydraulic valve hydraulic principle schematic representation of the present invention;
Fig. 2 is a limit flow hydraulic valve normal working section of structure of the present invention;
Fig. 3 is an automatic cut-out pressure source working state sectional drawing under the limit flow hydraulic valve leak of liquid situation of the present invention;
Fig. 4 is a limit flow hydraulic valve closed condition sectional drawing of the present invention;
Fig. 5 is a limit flow hydraulic valve return state sectional drawing of the present invention;
Fig. 6 is a limit flow hydraulic valve reset mode sectional drawing of the present invention;
Fig. 7 is a limit flow hydraulic valve fluid infusion state profile of the present invention;
Fig. 8 is limit flow hydraulic valve side formula of the present invention one-way valve valve body liquid inlet and outlet hole site directional profile figure when connecting.
1. valve bodies among the figure, 2. one-way valve spool, 3. back pressure valve spool, 4. back pressure valve Returnning spring, 5. back pressure valve gland, 6. taper type thimble, 7. the adjustable restrictive valve of limiting the quantity of, 8. standby adjustable restrictive valve, 9. stand-by channel I, 10. stand-by channel II, the path 11. limit the quantity of, 12. shared paths, 13. one-way valve valve body inlet openings, 14. one-way valve spool hole, 15. the back pressure valve spool bore, 16. back pressure valve inlet openings, 17. one-way valve valve body liquid outlet openings, 18. oil hydraulic cylinder rod chamber, 19. oil hydraulic cylinder rod chamber fluid infusion groove, 20. one-way valve valve body fluid-through chambers, 21. oil hydraulic cylinder rodless cavities, 22. the liquid flow direction and the route of flowing through, 23. valve body end caps.
Embodiment
The principle of present embodiment as shown in Figure 1.Limit flow hydraulic valve comprises valve body 1, one-way valve spool 2, back pressure valve spool 3, back pressure valve Returnning spring 4, back pressure valve gland 5, taper type thimble 6, the adjustable restrictive valve 7 of limiting the quantity of, standby adjustable restrictive valve 8, oil hydraulic cylinder rod chamber 18, one-way valve valve body fluid-through chamber 20, oil hydraulic cylinder rodless cavity 21 and valve body end cap 23.Valve body end cap 23 center fixation have taper type thimble 6, and the lower end is provided with connecting thread.Be provided with one-way valve valve body inlet opening 13 in valve body 1 upper end, be provided with connecting thread in the one-way valve valve body inlet opening 13, one-way valve spool 2 upper side evenly are provided with one-way valve spool hole 14 radially, back pressure valve spool 3 lower side evenly are provided with back pressure valve spool bore 15 radially, be provided with back pressure valve inlet opening 16 at back pressure valve gland 5 centers, be provided with axial one-way valve valve body liquid outlet opening 17 be positioned at thimble 6 on valve body end cap 23 around, one-way valve spool 2 upper ends are processed with oil hydraulic cylinder rod chamber fluid infusion groove 19.Being provided with oblique stand-by channel I 9 in a side of valve body 1 communicates with standby adjustable restrictive valve 8, be provided with stand-by channel II 10 between adjustable restrictive valve 7 and the standby adjustable restrictive valve 8 limiting the quantity of, be provided with the path 11 of limiting the quantity of between adjustable restrictive valve 7 and the oil hydraulic cylinder rod chamber 18 limiting the quantity of, be provided with shared path between adjustable restrictive valve 7 and the one-way valve valve body inlet opening 13 limiting the quantity of.
One-way valve spool 2 is housed in the valve body 1, limit the quantity of adjustable restrictive valve 7 and standby adjustable restrictive valve 8, install back pressure valve spool 3 in the one-way valve spool 2 additional, be provided with back pressure valve Returnning spring 4 in the back pressure valve spool 3, there is back pressure valve gland 5 at back pressure valve inlet opening 16 places, the adjustable restrictive valve 7 of limiting the quantity of links to each other oil hydraulic cylinder rod chamber 18 with shared path 12 by the path 11 of limiting the quantity of with one-way valve valve body inlet opening 13, standby adjustable restrictive valve 8 links to each other oil hydraulic cylinder rodless cavity 21 with shared path 12 by stand-by channel I 9, stand-by channel II10 with one-way valve valve body inlet opening 13.Under one-way valve spool 2 and back pressure valve spool 3 complete opening states, one-way valve valve body inlet opening 13 communicates with one-way valve valve body liquid outlet opening 17 by one-way valve valve body fluid-through chamber 20, one-way valve spool hole, back pressure valve spool bore 15, back pressure valve inlet opening 16.Be the reliability of guaranteeing that one-way valve spool 2 moves, the elastic force of back pressure valve Returnning spring 4 can not be too little, is greater than the resistance of one-way valve spool 2 when moving.
Working state I shown in Figure 2 has press liquid to enter in the valve body 1 from the one-way valve valve body liquid outlet opening 17 on the valve body end cap 23.Under the promotion that press liquid is arranged, one-way valve spool 2 moves up, liquid in compressing one-way valve valve body fluid-through chamber 20 and the oil hydraulic cylinder rod chamber 18 is discharged from one-way valve valve body inlet opening 13, and the flow of drain depends on the adjustment of limit the quantity of adjustable restrictive valve 7 and standby adjustable restrictive valve 8.The size that standby adjustable restrictive valve 8 is opened influences the sensitivity of the present invention to the slight Leak testtion of executive system, closes standby adjustable restrictive valve 8 under the executive system normal condition.When the flow of drain less than through the flow of one-way valve valve body inlet opening 13 required drains the time, liquid pressure difference in oil hydraulic cylinder rodless cavity 21 and the one-way valve valve body fluid-through chamber 20 will raise, when liquid pressure difference during greater than the ratio of the net sectional area of the elastic force of back pressure valve Returnning spring 4 and back pressure valve spool 3, having press liquid to promote back pressure valve spool 3 compression back pressure valve Returnning springs 4 moves up, open back pressure valve inlet opening 16, make liquid flow through the underfed that one-way valve spool 2 replenishes the liquid discharge of process one-way valve valve body inlet opening 13 through back pressure valve spool bore 15 and one-way valve spool hole 14.The flow direction and the route of flowing through that the liquid flow direction and the route 22 of flowing through are liquid in the valve body 1, I is dirty in working order is continuous route through route.
Working state II shown in Figure 3 has press liquid to enter in the valve body 1 from the one-way valve valve body liquid outlet opening 17 on the valve body end cap 23.Under the promotion that press liquid is arranged, one-way valve spool 2 moves up, liquid in compressing one-way valve valve body fluid-through chamber 20 and the oil hydraulic cylinder rod chamber 18 is discharged from one-way valve valve body inlet opening 13, and the flow of drain depends on the adjustment of limit the quantity of adjustable restrictive valve 7 and standby adjustable restrictive valve 8.The size that standby adjustable restrictive valve 8 is opened influences the sensitivity of the present invention to the slight Leak testtion of executive system, closes standby adjustable restrictive valve 8 under the executive system normal condition.When the flow of drain greater than through the flow of one-way valve valve body inlet opening 13 required drains the time, oil hydraulic cylinder rodless cavity 21 and liquid pressure difference in the one-way valve valve body fluid-through chamber 20 are the resistance that moves of one-way valve spool 2 and the ratio of one-way valve spool 2 net sectional areas.The resistance that one-way valve spool 2 moves is less than the elastic force of back pressure valve Returnning spring 4, and one-way valve spool 2 net sectional areas are greater than the net sectional area of back pressure valve spool 3.The liquid pressure difference pushes away the motionless back pressure valve spool 3 back pressure valve inlet opening 16 of also not opening, and liquid can not flow through one-way valve spool 2.The flow direction and the route of flowing through that the liquid flow direction and the route 22 of flowing through are liquid in the valve body 1, II is dirty in working order is the route that is interrupted through route.
The closed condition of working state I shown in Figure 4, II, there is press liquid to enter in the valve body 1 from the one-way valve valve body liquid outlet opening 17 on the valve body end cap 23, one-way valve spool 2 in the valve body 1 moves up under the promotion that press liquid is arranged, when being moved upward to one-way valve valve body inlet opening 13, one-way valve spool 2 is closed one-way valve valve body inlet opening 13, liquid can not flow through in valve body 1, and the cut-out pressure source is to the executive system feed flow automatically.
The return state of working state I shown in Figure 5, II has press liquid to enter in the valve body 1 from one-way valve valve body inlet opening 13.Because back pressure valve spool 3 has been closed the back pressure valve inlet opening under the elastic force effect of back pressure valve Returnning spring 4, liquid pressure difference in one-way valve valve body fluid-through chamber 20 and the oil hydraulic cylinder rodless cavity 21 all acts on the one-way valve spool 2, having press liquid to follow liquid flow direction enters in one-way valve valve body fluid-through chamber 20 and the oil hydraulic cylinder rod chamber 18 from one-way valve valve body inlet opening 13 with the route 22 of flowing through, have press liquid to promote one-way valve spool 2 and move down fast, the liquid in the one-way valve spool 2 compressing oil hydraulic cylinder rodless cavities 21 is discharged from one-way valve valve body liquid outlet opening 17.Realize the work of returning of one-way valve spool 2.
The reset mode of working state I shown in Figure 6, II, having press liquid to enter valve body 1 back promotion one-way valve core 2 from one-way valve valve body inlet opening 13 moves down fast, when one-way valve spool 2 is moved downward to valve body end cap 23, taper type thimble 6 backs down back pressure valve spool 3, and press liquid is passed through in one-way valve spool 2 through back pressure valve spool 3.Because one-way valve spool 2 moves down fast and the throttling of the adjustable restrictive valve 7 of limiting the quantity of, can cause the parital vacuum in the oil hydraulic cylinder rod chamber 18, thereby one-way valve spool 2 initial positions differ when influencing next working state, thereby be processed with oil hydraulic cylinder rod chamber fluid infusion groove 19 in the upper end of one-way valve spool 2, oil hydraulic cylinder rod chamber fluid infusion groove can not be processed longly, the long throttling of adjustable restrictive valve 7 of can influence limiting the quantity of just in time can cover liquid for well when backing down back pressure valve spool 3 with taper type thimble 6.
Shown in Figure 7, when executive system generation leakage does not have enough liquid to make one-way valve spool 2 do downward reset movement, open standby adjustable restrictive valve 8, make the liquid that enters in the valve body 1 flow through one-way valve valve body inlet opening 13, executive system is carried out fluid infusion to guarantee the realization of function of the present invention by oil hydraulic cylinder rodless cavity 21, stand-by channel I 9, standby adjustable restrictive valve 8, stand-by channel II 10 and shared path 12.
Shown in Figure 8, when the present invention is connected for the side formula with the Placement of outside, the hole that one-way valve valve body inlet opening 13 and one-way valve valve body liquid outlet opening 17 change into perpendicular to one-way valve spool 2 axis, one-way valve valve body inlet opening 13 is positioned at the topmost part of valve body 1, and one-way valve valve body liquid outlet opening 17 is positioned at the bottom of valve body 1 and the position of close valve body end cap 23.
Claims (6)
1. limit flow hydraulic valve, comprise valve body, the one-way valve spool, the adjustable restrictive valve of limiting the quantity of, standby adjustable restrictive valve, oil hydraulic cylinder rod chamber, one-way valve valve body fluid-through chamber and oil hydraulic cylinder rodless cavity, it is characterized in that being provided with the back pressure valve spool at the one-way valve in-core, be provided with the back pressure valve Returnning spring in the back pressure valve spool, back pressure valve spool bottom is provided with the back pressure valve gland; Periphery is provided with an annular piston in one-way valve spool lower end, become one with the one-way valve spool, and with the valve interior wall Spielpassung; Be provided with valve body end cap in the valve body bottom, the valve body end cap center fixation has axial taper type thimble.
2. according to the described a kind of limit flow hydraulic valve of claim 1, it is characterized in that described back pressure valve spool opening direction is opposite with one-way valve spool opening direction.
3. according to the described a kind of limit flow hydraulic valve of claim 1, it is characterized in that the bottom centre position of described taper type thimble top over against the back pressure valve spool, the taper type thimble backs down the back pressure valve spool when the one-way valve spool is moved downward to the valve body end cap place.
4. according to the described a kind of limit flow hydraulic valve of claim 1, it is characterized in that described one-way valve spool upper end is processed with oil hydraulic cylinder rod chamber fluid infusion groove.
5. according to the described a kind of limit flow hydraulic valve of claim 1, it is characterized in that described valve body upper end is provided with inlet opening, is provided with liquid outlet opening on valve body end cap.
6. according to the described a kind of limit flow hydraulic valve of claim 1, it is characterized in that the liquid inlet and outlet hole of its valve body is provided with the axis perpendicular to the one-way valve spool when this limit flow hydraulic valve is connected with the side formula that is connected to of outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810012549A CN100582540C (en) | 2008-07-30 | 2008-07-30 | Limit flow hydraulic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810012549A CN100582540C (en) | 2008-07-30 | 2008-07-30 | Limit flow hydraulic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101324285A CN101324285A (en) | 2008-12-17 |
| CN100582540C true CN100582540C (en) | 2010-01-20 |
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ID=40187938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810012549A Expired - Fee Related CN100582540C (en) | 2008-07-30 | 2008-07-30 | Limit flow hydraulic valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100582540C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858368B (en) * | 2010-05-13 | 2013-06-05 | 山东泰丰液压股份有限公司 | Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation |
| CN101949397A (en) * | 2010-10-20 | 2011-01-19 | 竺浩君 | Balanced valve bank of derricking cylinder system |
| CN105424269A (en) * | 2015-12-31 | 2016-03-23 | 天津春华发科技有限公司 | Pipeline pressure gauge |
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2008
- 2008-07-30 CN CN200810012549A patent/CN100582540C/en not_active Expired - Fee Related
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| CN101324285A (en) | 2008-12-17 |
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Granted publication date: 20100120 Termination date: 20170730 |