CN1294362C - Programme-controlled differential multiple unit valve - Google Patents
Programme-controlled differential multiple unit valve Download PDFInfo
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- CN1294362C CN1294362C CNB2005100458839A CN200510045883A CN1294362C CN 1294362 C CN1294362 C CN 1294362C CN B2005100458839 A CNB2005100458839 A CN B2005100458839A CN 200510045883 A CN200510045883 A CN 200510045883A CN 1294362 C CN1294362 C CN 1294362C
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Abstract
The present invention relates to a program controlled differential multi-path valve which comprises a program controlled automatic reversing valve sheet, a reversing valve sheet, an oil filling valve sheet and an oil returning valve sheet, wherein the program controlled automatic reversing valve sheet is provided with a valve body in which working cavities, a pressure cavity, an oil filling cavity of the valve sheet, an oil returning cavity of the valve sheet, an unloading cavity and an oil returning cavity; a one-way valve is arranged between the oil filling cavity of the valve sheet and the pressure cavity; a valve rod, which provided with annular grooves corresponding to the working cavities, the oil filling cavity of the valve sheet and the oil returning cavity of the valve sheet of the valve body, is arranged in the valve body. The present invention is characterized in that the non-operation end of the valve rod is provided with an automatic resetting device composed of a bouncing limiting device, a needle valve and a spring centring device; one working cavity of the valve body is communicated with the pressure cavity. The present invention has the advantages that the whole process that the working parts of a garbage vehicle can be downwards shrunk, shrunk to a garbage barn, and can return to the initial position is realized. Besides, the present invention also has the advantages of simple structure and reliable performance, and performs the function of rapid differential action in the process that the working parts returns to the initial position in a no-load condition so as to improve work efficiency.
Description
Technical field
The invention belongs to a kind of hydraulic control valve, particularly a kind of programme-controlled differential multiple unit valve that is used for city compression type refuse transport vehicle hydraulic system.
Background technique
Along with the continuous development of China's urban construction, the scale in city is increasing, and is also more and more higher to the requirement of environmental hygiene work and sanitation equipment.Traditional open type dump car can not adapt to the municipal waste requirements on transport, and the city compression type refuse transport vehicle becomes the common selection of people.The advantage of city compression type refuse transport vehicle mainly contains two, and one is that rubbish is in closed state, in the process of transportation, can not be blown off or be scattering into outside the car, has guaranteed the clean and tidy of environment.Another is that rubbish is compressed in the trash repository, has reduced volume, so the city compression type refuse transport vehicle can load more rubbish, transport capacity is several times of common open type dump car.The process that the city compression type refuse transport vehicle loads rubbish is, the rubbish that will be placed on earlier on the plate of tumbling upwards ploughs under compression bin, and then, rotating clamp moves downward, and once compresses, with garbage truck.After once compression was finished, tilted platen moved upward, and rubbish is pressed into the trash repository from compression bin, finishes secondary compression.After the rubbish compression was finished, the manipulation reversing handle makes as the rotating clamp and the tilted platen of workpiece got back to initial position by two actions under unloaded state, get ready for compressing once more.
Program control multi-way valve is the core hydraulic control component in the compression type refuse transport vehicle hydraulic system of city, is used for handling and controlling the motion of each parts.Existing program control multi-way valve adopts multi-disc overlapping structure usually, and the valve block combine and assemble that is about to a plurality of difference in functionalitys constitutes the multiple directional control valve with specific function together.It mainly is made of program control Reversing valve plate, Reversing valve plate, oil-feed valve block and oil return valve block etc.Reversing valve plate is used for the rubbish on the plate of tumbling is upwards ploughed under compression bin, and program control Reversing valve plate is used for rubbish is compressed to trash repository from compression bin.Wherein, program control Reversing valve plate adopts two, it is to improve to form on the basis of existing Reversing valve plate, automatic reset device promptly is set in Reversing valve plate, finishes workpiece to lower compression, the compression and the overall process of under unloaded state, getting back to initial position in trash repository again by automatic reset device.Though this program control valve block has solved the Procedural Control of refuse collection vehicle workpiece, but the structure of its automatic reset device is too complicated, requirement on machining accuracy is higher, and, this valve block does not possess the function that workpiece is resetted fast under unloaded state, inefficiency, its technical performance also is difficult to satisfy people's requirement.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes existing program control multi-way valve complex structure, the unfavorable problem of technical performance, and a kind of simple in structure, programme-controlled differential multiple unit valve with program control and differential quick function is provided.
The present invention includes the PROGRAMMED AUTO Reversing valve plate, Reversing valve plate, oil-feed valve block and oil return valve block, described PROGRAMMED AUTO Reversing valve plate has a valve body, active chamber is arranged in the valve body, pressure chamber, the valve block oil suction chamber, the valve block oil back chamber, drain charge chamber and oil back chamber, between valve block oil suction chamber and pressure chamber, one-way valve is housed, valve rod is housed in valve body, have on the valve rod with valve body in active chamber, the valve block oil suction chamber, the corresponding annular recess of valve block oil back chamber, its special way is, not operation end at valve rod is equipped with automatic reset device, automatic reset device is by the spring limit stoper, needle-valve and spring centralising device constitute, described spring limit stoper is by spring housing, the pressure regulation limit spring, locking ball, spring valve and setting sleeve constitute, spring housing is installed in the end of valve rod, the spring valve is installed in the valve rod, the pressure regulation limit spring is installed between spring housing and the spring valve, locking ball is installed in the radial hole of valve rod, setting sleeve is installed on the valve body, the locating slot that matches with locking ball is arranged on it, when valve rod runs to the qualification position, it is positioned, needle-valve is installed in the valve rod, needle one end of needle-valve contacts with the spring valve of spring limit stoper, the other end is positioned at the center hole of valve rod, the pressure signal selecting hole that on valve rod, communicates with its center hole in addition, when the pressure of pressure oil reaches setting value, promote the spring valve by needle and move, make valve rod get back to meta.
Described spring centralising device is made of two spring seats and a Returnning spring, a spring seat is stuck in the upper end of valve rod, another spring seat is stuck in the top of spring housing, Returnning spring is between two spring seats, the spring centralising device makes valve rod get back to and remain on the neutral position of PROGRAMMED AUTO Reversing valve plate, thus make the workpiece of refuse collection vehicle realize to lower compression, in trash repository the compression and the overall process of under unloaded state, getting back to initial position by two actions.
An active chamber of described valve body communicates with pressure chamber, makes operating cylinder two chambeies enter pressure oil simultaneously, and oil cylinder piston moves by the area difference of its both sides, thereby has realized differential function fast.
The invention has the advantages that:
1, on the PROGRAMMED AUTO Reversing valve plate, automatic reset device is set, the workpiece of not only controlling refuse collection vehicle realized to lower compression, in trash repository the compression and the overall process of under unloaded state, getting back to initial position, and, simple in structure, reliable performance, processing and assembling is easy, low production cost.
2, stem movement to the operation the qualification position time, locking ball in the spring limit stoper enters into the locating slot on the setting sleeve, valve rod is positioned on this position, operator's hand can leave operating handle, and cooperatively interacting by spring limit stoper, needle-valve and spring centralising device, twice compression or twice homing action follow procedure when loading rubbish are finished automatically, easy and simple to handle.
3, valve body active chamber communicates with pressure chamber, gets back in the process of initial position at the workpiece unloaded state, has realized differential function fast, thereby has improved the working efficiency of refuse collection vehicle.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is a fundamental diagram of the present invention.
Embodiment
As shown in drawings, the present invention includes two PROGRAMMED AUTO Reversing valve plates 3, Reversing valve plate 2, an oil-feed valve block 4 and an oil return valve block 1, on oil-feed valve block 4, oil inlet P is arranged, on oil return valve block 1, oil return inlet T is arranged, active chamber A3 and active chamber B3 are arranged on Reversing valve plate 2, and above-mentioned valve block is existing valve block; Two PROGRAMMED AUTO Reversing valve plate 3 structures are identical, are installed between oil-feed valve block 4 and the Reversing valve plate 2, and active chamber A1 and active chamber B1 are arranged on one of them PROGRAMMED AUTO Reversing valve plate 3, and active chamber A2 and active chamber B2 are arranged on another PROGRAMMED AUTO Reversing valve plate 3; PROGRAMMED AUTO Reversing valve plate 3 also is not limited to two, when practical application, can increase according to actual needs, to finish different program control functions; Described PROGRAMMED AUTO Reversing valve plate 3 has a valve body 10, pressure chamber Y, valve block oil suction chamber P1, valve block oil back chamber P2, drain charge chamber X, oil back chamber T1 is arranged in valve body 10, reach active chamber A1 and active chamber B1; Between valve block oil suction chamber P1 and pressure chamber Y, one-way valve is housed, described one-way valve is made of steel ball 30 and spring 28, spring 28 usefulness valve seats 29 are assemblied in the valve body 10, seal with seal ring 27 between valve seat 29 and the valve body 10, when valve block oil suction chamber P1 communicates with valve block oil back chamber P2, one-way valve is closed under the effect of spring 28, when valve block oil suction chamber P1 and valve block oil back chamber P2 are obstructed, opens under the effect of one-way valve pressure oil in valve block oil suction chamber P1; Valve rod 5 is housed in valve body 10, and the two ends of valve rod 5 also are equipped with dust ring 6 with seal ring 8 and seal ring 15 sealings in the operating end of valve rod 5, avoid dust to enter, and dust ring 6 usefulness end caps 9 and screw 7 are fixed; On valve rod 5, have with valve body 10 in active chamber A1, the corresponding annular recess C1 of valve block oil suction chamber P1, valve block oil back chamber P2, C2, C3; Not operation end at valve rod 5 is equipped with automatic reset device, automatic reset device is by the spring limit stoper, needle-valve and spring centralising device constitute, described spring limit stoper is by spring housing 23, pressure regulation limit spring 25, locking ball 17, spring valve 16 and setting sleeve 26 constitute, spring housing 23 is installed in the end of valve rod 5, spring valve 16 is installed in the valve rod 5, pressure regulation limit spring 25 is installed between spring housing 23 and the spring valve 16, locking ball 17 is installed in the radial hole of valve rod 5, setting sleeve 26 is installed on the valve body 10, the locating slot that matches with locking ball 17 is arranged on it, when valve rod 5 runs to the qualification position, it is positioned, the middle part of described spring valve 16 is thin, and two ends are thick, and is connected with the conical surface, by cooperating of spring valve 16 and locking ball 17 and setting sleeve 26, the locating function of realization valve rod 5; Described needle-valve is installed in the valve rod 5, needle-valve is by needle 14, guide pin bushing 13, back-up ring 12 and seal ring 11 constitute, between guide pin bushing 13 and the valve rod 5 for being threaded, and back-up ring 12 and seal ring 11 compressed, back-up ring 12 adopts two, be installed in the both sides of seal ring 11 respectively, 11 pairs of needles 14 of seal ring play seal action, one end of needle 14 contacts with spring valve 16, the other end is positioned at the center hole of valve rod 5, the pressure signal selecting hole D that on valve rod 5, communicates with its center hole in addition, when valve rod 5 was in meta, pressure signal selecting hole D was between pressure chamber Y and valve block oil suction chamber P1, when valve rod 5 is in the working position, pressure signal selecting hole D communicates with valve block oil suction chamber P1 or pressure chamber Y, and induced pressure oil enters in the center hole of valve rod 5, when pressure reaches setting value through pressure signal selecting hole D, promoting spring valve 16 by needle 14 moves, make locking ball 17 enter into the place, thin footpath at spring valve 16 middle parts, and under the effect of spring centralising device, make valve rod 5 get back to meta; Regulator bolts 20 also is housed on spring housing 23, spring seat 24 is housed on regulator bolts 20, spring seat 24 is bearing on the pressure regulation limit spring 25, adjusts and set the setting value that needle-valve is opened by regulator bolts 20; Described spring centralising device is made of two spring seats 21 and a Returnning spring 22, a spring seat 21 is stuck in the upper end of valve rod 5, another spring seat 21 is stuck in the top of spring housing 23, Returnning spring 22 is between two spring seats 21, the spring centralising device makes valve rod 5 get back to and remain on the neutral position of PROGRAMMED AUTO Reversing valve plate 3, thus make the workpiece of refuse collection vehicle realize to lower compression, in trash repository the compression and the overall process of under unloaded state, getting back to initial position by two actions; Valve bonnet 19 also is housed on valve body 10, and described spring centralising device is positioned at valve bonnet 19, valve bonnet 19 usefulness pressing plate 18 and bolt; An active chamber B1 of described valve body 10 communicates with pressure chamber Y, makes operating cylinder two chambeies enter pressure oil simultaneously, and oil cylinder piston moves by the area difference of its both sides, thereby has realized differential function fast.
During use, the active chamber B1 of two PROGRAMMED AUTO Reversing valve plates 3 of the present invention and active chamber B2 connect the rod chamber of operating cylinder, and active chamber A1 and active chamber A2 connect the rodless cavity of operating cylinder.
Work control procedure of the present invention is as follows:
When the needs compressed garbage carries out program control, two program control reversing handles are pulled outwardly simultaneously, it is pulled the compression work position, locking ball 17 enters into the locating slot of setting sleeve 26 near valve body 10 1 sides, at this moment, the upper end portion of spring valve 16 is positioned at locking ball 17 places, stops locking ball 17 to be got back in the valve rod 5, promptly stop locking ball 17 to get back to the place, thin footpath at spring valve 16 middle parts, make valve rod 5 in the compression work location positioning; Because PROGRAMMED AUTO Reversing valve plate 3 of the present invention adopts the series connection oil circuit, so first PROGRAMMED AUTO Reversing valve plate 3 is started working, at this moment, valve block oil suction chamber P1 and valve block oil back chamber P2 close, pressure signal selecting hole D communicates with valve block oil suction chamber P1, and active chamber A1 communicates with drain charge chamber X by the groove C1 on the valve rod 5; Pressure oil among the valve block oil suction chamber P1 is opened one-way valve and is entered into pressure chamber Y, because active chamber B1 communicates with pressure chamber Y, so pressure oil enters into the rod chamber of operating cylinder through active chamber B1, promote piston motion, pressure oil in the rodless cavity is then got back in the fuel tank by active chamber A1, drain charge chamber X and oil back chamber T1, when terminal point was arrived in piston motion, the workpiece of refuse collection vehicle was finished compressed action for the first time; At this moment, because piston has run to the terminal point of operating cylinder, the working pressure of pressure oil rises in the PROGRAMMED AUTO Reversing valve plate 3, when working pressure rises to the setting value of needle-valve unlatching, needle 14 setting in motions of needle-valve, and valve 16 motions that promote to bounce, make locking ball 17 enter into the place, thin footpath at spring valve 16 middle parts, valve rod 5 is under the effect of spring centralising device, automatically reset to the valve rod meta, at this moment, valve block oil suction chamber P1 is by the groove C2 on the valve rod 5, C3 communicates with valve block oil back chamber P2, and pressure oil enters into second PROGRAMMED AUTO Reversing valve plate 3 by valve block oil back chamber P2, second PROGRAMMED AUTO Reversing valve plate 3 repeats the course of action of first PROGRAMMED AUTO Reversing valve plate 3, finish the compressed action second time of refuse collection vehicle workpiece, so, first program control process finished.
When the workpiece that needs refuse collection vehicle is got back to the home position and is carried out program control under unloaded state, two program control reversing handles are pushed inward simultaneously, it is pulled the working position that resets, locking ball 17 enters into the locating slot of setting sleeve 26 near valve bonnet 19 1 sides, at this moment, the upper end portion of spring valve 16 is positioned at locking ball 17 places, stops locking ball 17 to be got back in the valve rod 5, promptly stop locking ball 17 to get back to the place, thin footpath at spring valve 16 middle parts, make valve rod 5 in the location, working position that resets; At first, first PROGRAMMED AUTO Reversing valve plate 3 is started working, at this moment, valve block oil suction chamber P1 and valve block oil back chamber P2 close, pressure signal selecting hole D communicates with pressure chamber Y and active chamber B1, and active chamber A1 communicates with pressure chamber Y by the groove C1 on the valve rod 5, and drain charge chamber X closes; Pressure oil among the valve block oil suction chamber P1 is opened one-way valve and is entered into pressure chamber Y, because active chamber B1 communicates with pressure chamber Y, so pressure oil enters into the rod chamber of operating cylinder through active chamber B1, simultaneously, pressure oil among the pressure chamber Y enters into the rodless cavity of operating cylinder through active chamber A1, be that pressure oil enters active chamber A1 and active chamber B1 simultaneously, active chamber A1 and active chamber B1 while are to the rodless cavity and the rod chamber fuel feeding of operating cylinder, that is to say that the rodless cavity of operating cylinder and rod chamber all communicate with pressure chamber Y and valve block oil suction chamber P1 by active chamber A1 and active chamber B1; Because pressure oil equates with the pressure of pressure oil in the rodless cavity in the operating cylinder rod chamber, and the pressure oil active area of operating cylinder rodless cavity is greater than the pressure oil active area of rod chamber, so promoting piston, pressure oil moves to the rod chamber direction, at this moment, pressure oil in the rod chamber refluxes, and by active chamber B1, pressure chamber Y and valve block oil suction chamber P1 enter into active chamber A1, with the pressure oil interflow among the active chamber A1, promote piston to rod chamber direction rapid movement, at piston in the process of rod chamber direction motion, because the pressure oil in the rod chamber will be back in the rodless cavity, therefore, as long as replenish the pressure oil that equates with the volume of piston rod again, piston promptly is moveable to the terminal point of operating cylinder, that is to say, in the process that the refuse collection vehicle workpiece resets, the difference of the volume that volume that the operating cylinder rodless cavity increases and rod chamber reduce equals the volume of piston rod, and the volume of piston rod is smaller, thereby the workpiece that PROGRAMMED AUTO Reversing valve plate 3 can be controlled refuse collection vehicle resets fast, realize the differential function that resets fast, the workpiece of refuse collection vehicle is finished homing action for the first time; At this moment, because piston has run to the terminal point of operating cylinder, the working pressure of pressure oil rises in the PROGRAMMED AUTO Reversing valve plate 3, when working pressure rises to setting value, the needle 14 of needle-valve promotes 16 motions of spring valve, make locking ball 17 enter into the place, thin footpath at spring valve 16 middle parts, valve rod 5 is under the effect of spring centralising device, automatically reset to the valve rod meta, at this moment, valve block oil suction chamber P1 is by the groove C2 on the valve rod 5, C3 communicates with valve block oil back chamber P2, pressure oil enters into second PROGRAMMED AUTO Reversing valve plate 3 by valve block oil back chamber P2, second PROGRAMMED AUTO Reversing valve plate 3 repeats the course of action of first PROGRAMMED AUTO Reversing valve plate 3, finishes the homing action second time of refuse collection vehicle workpiece, realizes second program control process.
Claims (3)
1, a kind of programme-controlled differential multiple unit valve, comprise the PROGRAMMED AUTO Reversing valve plate, Reversing valve plate, oil-feed valve block and oil return valve block, described PROGRAMMED AUTO Reversing valve plate has a valve body, active chamber is arranged in the valve body, pressure chamber, the valve block oil suction chamber, the valve block oil back chamber, drain charge chamber and oil back chamber, between valve block oil suction chamber and pressure chamber, one-way valve is housed, valve rod is housed in valve body, have on the valve rod with valve body in active chamber, the valve block oil suction chamber, the corresponding annular recess of valve block oil back chamber, it is characterized in that, not operation end at valve rod is equipped with automatic reset device, automatic reset device is by the spring limit stoper, needle-valve and spring centralising device constitute, described spring limit stoper is by spring housing, the pressure regulation limit spring, locking ball, spring valve and setting sleeve constitute, spring housing is installed in the end of valve rod, the spring valve is installed in the valve rod, the pressure regulation limit spring is installed between spring housing and the spring valve, locking ball is installed in the radial hole of valve rod, setting sleeve is installed on the valve body, the locating slot that matches with locking ball is arranged on it, needle-valve is installed in the valve rod, needle one end of needle-valve contacts with the spring valve, the other end is positioned at the center hole of valve rod, the pressure signal selecting hole that communicates with its center hole in addition on valve rod.
2, programme-controlled differential multiple unit valve according to claim 1, it is characterized in that described spring centralising device is made of two spring seats and a Returnning spring, a spring seat is stuck in the upper end of valve rod, another spring seat is stuck in the top of spring housing, and Returnning spring is between two spring seats.
3, programme-controlled differential multiple unit valve according to claim 1 is characterized in that, an active chamber of described valve body communicates with pressure chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100458839A CN1294362C (en) | 2005-02-09 | 2005-02-09 | Programme-controlled differential multiple unit valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100458839A CN1294362C (en) | 2005-02-09 | 2005-02-09 | Programme-controlled differential multiple unit valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1657792A CN1657792A (en) | 2005-08-24 |
| CN1294362C true CN1294362C (en) | 2007-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100458839A Expired - Fee Related CN1294362C (en) | 2005-02-09 | 2005-02-09 | Programme-controlled differential multiple unit valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1294362C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776078B (en) * | 2015-03-28 | 2017-03-01 | 合肥长源液压股份有限公司 | There is the used with tractor allotter of auto-reset function |
| CN106762899B (en) * | 2016-11-25 | 2019-02-05 | 合肥协力液压科技有限公司 | One kind automatically resets valve rod assembly |
| CN109798274B (en) * | 2019-03-18 | 2024-01-16 | 江苏力源液压机械有限公司 | Positioning rotary jump mechanism on hydraulic reversing valve |
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|---|---|---|---|---|
| GB1276927A (en) * | 1969-05-22 | 1972-06-07 | Rubery Owen And Company Ltd | Improvements relating to fluid flow control valves |
| US4693272A (en) * | 1984-02-13 | 1987-09-15 | Husco International, Inc. | Post pressure compensated unitary hydraulic valve |
| DE3611244A1 (en) * | 1986-04-04 | 1987-10-08 | Rexroth Mannesmann Gmbh | Flow-control valve |
| CN2172364Y (en) * | 1993-09-22 | 1994-07-20 | 肇州液压件厂 | Pressure adaptation multi-way orientable valve |
| CN2248264Y (en) * | 1995-09-08 | 1997-02-26 | 中国汽车工业总公司重庆汽车研究所 | Lifting distributing valve for self-unloading vehicle |
| JP2003083302A (en) * | 2001-09-06 | 2003-03-19 | Uchida Hydraulics Co Ltd | Garbage box dumping hydraulic device of garbage truck |
| CN1573127A (en) * | 2003-05-13 | 2005-02-02 | 沙厄-丹福丝股份有限公司 | Method of controlling a swinging boom and apparatus for controlling the same |
-
2005
- 2005-02-09 CN CNB2005100458839A patent/CN1294362C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1276927A (en) * | 1969-05-22 | 1972-06-07 | Rubery Owen And Company Ltd | Improvements relating to fluid flow control valves |
| US4693272A (en) * | 1984-02-13 | 1987-09-15 | Husco International, Inc. | Post pressure compensated unitary hydraulic valve |
| DE3611244A1 (en) * | 1986-04-04 | 1987-10-08 | Rexroth Mannesmann Gmbh | Flow-control valve |
| CN2172364Y (en) * | 1993-09-22 | 1994-07-20 | 肇州液压件厂 | Pressure adaptation multi-way orientable valve |
| CN2248264Y (en) * | 1995-09-08 | 1997-02-26 | 中国汽车工业总公司重庆汽车研究所 | Lifting distributing valve for self-unloading vehicle |
| JP2003083302A (en) * | 2001-09-06 | 2003-03-19 | Uchida Hydraulics Co Ltd | Garbage box dumping hydraulic device of garbage truck |
| CN1573127A (en) * | 2003-05-13 | 2005-02-02 | 沙厄-丹福丝股份有限公司 | Method of controlling a swinging boom and apparatus for controlling the same |
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| Publication number | Publication date |
|---|---|
| CN1657792A (en) | 2005-08-24 |
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