CN203904997U - Hydraulic system of static pile press - Google Patents
Hydraulic system of static pile press Download PDFInfo
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- CN203904997U CN203904997U CN201420343570.6U CN201420343570U CN203904997U CN 203904997 U CN203904997 U CN 203904997U CN 201420343570 U CN201420343570 U CN 201420343570U CN 203904997 U CN203904997 U CN 203904997U
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- 230000003068 static effect Effects 0.000 title claims abstract description 24
- 239000002243 precursor Substances 0.000 claims description 13
- 239000002828 fuel tank Substances 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 abstract description 12
- 239000003921 oil Substances 0.000 description 133
- 239000010720 hydraulic oil Substances 0.000 description 10
- 241001347978 Major minor Species 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The utility model provides a hydraulic system of a static pile press. The hydraulic system comprises a pile clamping oil cylinder, a pile pressing oil cylinder, a supporting leg oil cylinder, long ship oil cylinders, short ship oil cylinders and a manual unloading valve, wherein the pile clamping oil cylinder, the pile pressing oil cylinder and the supporting leg oil cylinder are connected to a seven-body-connected combined multi-way valve; the long ship oil cylinders and the short ship oil cylinders are connected to a four-body-connected manual multi-way valve; the seven-body-connected combined multi-way valve and the four-body-connected manual multi-way valve are connected to an oil pump; the pile pressing oil cylinder is communicated with a pile pressing unloading valve; the manual unloading valve is connected to a pilot overflow valve communicated with the oil pump. According to the hydraulic system, the working efficiency is high, the labor intensity is reduced, heat of the hydraulic system is reduced, and the hydraulic system is safe and reliable.
Description
Technical field
The utility model relates to piling machinery technical field, especially relates to a kind of hydraulic system of static pile press.
Background technology
Silent piling is to utilize static pressure (pile press deadweight and counterweight) that preformed pile is pressed into the pile pressing method in soil section by section.This method is saved reinforcing bar and concrete, reduces construction costs, and noise is low, pollution-free when construction, little to the interference of surrounding environment, is applicable to the pile foundation engineering at soft clay area, down town or the intensive place of building, and the extension project of accurate factory.
Hydraulic static pile pressing machine is divided into " hugging pressure type hydraulic static pile pressing machine " and two kinds of " top press type hydralic static pile press machine " (being exerted pressure and carry out piling in stake top).The piling process of hugging pressure type hydraulic static pile pressing machine is " to embrace " firmly pile body side by clamping device, and generation friction power transmission realizes thus; Top press type hydralic static pile press machine is to exert pressure from the top of preformed pile, is pressed into ground.Due to the mode of transfer force difference of exerting pressure, these two kinds of stake machine form of structure, performance characteristics, scope of applications also have remarkable difference.Its core is design and the configuration thereof of hydraulic system, and it directly affects technical performance and the energy-saving effect of complete machine.
From 20 century 70 later stages to the mid-90, domestic priority has been developed several pile presss, and progressively forms series of products and come into the market.Wherein, the ZYJ Series Hydraulic static pile press that the patented technology of Central South University's intelligent machine research institute is produced is the most representative.Mainly solve design theory basis, power configuration and the system design problem of this stake machine in this stage, met the basic function of static pressed pile.But just generally,, its principal character is that a machine pile driving pressure is little, function singleness.And pile for prestressed pipe and high-strength prestress pile tube are mainly to squeeze into construction by hammering equipment as diesel hammer etc.
After entering the mid-90 in 20th century, hydraulic static pile pressing machine enters the second developing stage.Succeed owing to utilizing for the end of the year 1994 hydraulic static pile pressing machine that the pile for prestressed pipe of diameter 500 mm is pressed into strong-weathered rock in Zhuhai, realize the historical breakthrough of Constructive technology of static pressure pile, from then on widened the range of application of static pressed pile, also made the application of pile for prestressed pipe in city and residential neighborhoods find a new route.On the one hand, realized the bearing capacity of single pile of static pressed pile to the fast development of large-tonnage direction, meanwhile, market constantly increases the demand of large-tonnage stake machine, and requires more and more stronger; On the other hand, due to the continuous expansion of boundary of works area, also increasing to the requirement of stake machine function, there are many practical problems that must solve in engineering construction.The stake machine kind in this stage significantly increases, and seriation is constantly perfect, and manufacturer also sharply increases.
A complete hydraulic system is made up of five parts, i.e. dynamical element (oil pump), executive component (hydraulic jack or hydraulic motor), control element (various valve class), auxiliary element (annex) and working media (hydraulic oil).The quality of a hydraulic system depend on system reasonability, system element performance quality, the pollution protection of system and processing.China hydraulic engineer major part is designed to master with application at present, is grouped together by standard component, and this has just occurred a problem, and existing exactly part can not meet the demands.
Conventionally there is following problem in the hydraulic system of existing hydraulic static pile pressing machine: Hydraulic System Fever is large; Complete machine hydraulic system is very unstable at work; Piling speed is slow; In the time of large-tonnage piling, the machine pressure release time is long, if manually lay down load, machine vibration is large; Labor strength is large.
Utility model content
For above-mentioned defect, the purpose of this utility model is to provide a kind of hydraulic system of static pile press, and its system heating is little, safe and reliable.
To achieve these goals, the utility model provides a kind of hydraulic system of static pile press, comprise clip pile oil cylinder, piling oil cylinder, support oil cylinder, long ship oil cylinder and short ship oil cylinder, described clip pile oil cylinder, piling oil cylinder and support oil cylinder are connected to seven joint groups and close banked direction control valves, described long ship oil cylinder and short ship oil cylinder are connected to tetrad manual multiple-way valve, described seven joint groups close banked direction control valves and described tetrad manual multiple-way valve is connected to oil pump, and described piling oil cylinder is communicated with a piling unloader; Described hydraulic system also comprises Manual relief valve, and described Manual relief valve is connected to precursor overflow valve, and described precursor overflow valve is communicated with described oil pump.
According to hydraulic system of the present utility model, the piling oil cylinder of described hydraulic system comprises main compressing cylinder and secondary compressing cylinder, and described main compressing cylinder is connected to described seven joint groups by a differential valve group and closes banked direction control valves, and described differential valve group is also connected with a manual acceleration valve.
According to hydraulic system of the present utility model, described hydraulic system also comprises the oil strainer and the motor that are connected with described oil pump, and described oil strainer is communicated with fuel tank.
According to hydraulic system of the present utility model, described clip pile oil cylinder is connected to described seven joint groups by a hydraulic control one-way valve and closes banked direction control valves.
According to hydraulic system of the present utility model, described hydraulic system also comprises the air filter and the content gauge that are connected to fuel tank.
According to hydraulic system of the present utility model, described hydraulic system also comprises hydraulic pilot handle, and described hydraulic pilot handle is communicated with a gear pump, and described gear pump connects guide's motor.
According to hydraulic system of the present utility model, described oil pump and described seven joint groups close between banked direction control valves and described tetrad manual multiple-way valve and are connected with one way valve.
According to hydraulic system of the present utility model, described oil pump comprises the first oil pump, the second oil pump and the 3rd oil pump, the oil-out of described the first oil pump is communicated with described tetrad manual multiple-way valve, described tetrad manual multiple-way valve closes banked direction control valves with described seven joint groups and is communicated with, and the oil-out of described the second oil pump and the 3rd oil pump is jointly connected to described tetrad manual multiple-way valve and described seven joint groups close the oil circuit between banked direction control valves.
According to hydraulic system of the present utility model, described seven joint groups close banked direction control valves, described tetrad manual multiple-way valve and described clip pile oil cylinder and are connected to respectively an oil pressure gauge.
Hydraulic system of the present utility model comprises clip pile oil cylinder, piling oil cylinder, support oil cylinder, long ship oil cylinder and short ship oil cylinder, clip pile oil cylinder, piling oil cylinder and support oil cylinder are connected to seven joint groups and close banked direction control valves, long ship oil cylinder and short ship oil cylinder are connected to tetrad manual multiple-way valve, seven joint groups close banked direction control valves and tetrad manual multiple-way valve is connected to oil pump, and piling oil cylinder is communicated with a piling unloader; System also comprises Manual relief valve, and Manual relief valve is connected to precursor overflow valve, and precursor overflow valve is communicated with described oil pump.In the time starting the machine, operated pilot overflow valve handle makes precursor overflow valve outside control mouth connect fuel tank, and system is without pressure, the oil of oil pump oil-out is directly by overflow valve oil sump tank, hydraulic oil, without pipeline friction, reduces the friction of hydraulic oil in pipeline and valve the inside, the heating of reduction system.In the time that stake is pressed into depths, stratum, stratum is increasing to the reaction force of stake, and now hydraulic fluid pressure is large, in the time that part combination banked direction control valves second, the 3rd is got back to meta O function, can make piling oil cylinder pressurize, after the dwell time finishes, operation pressure release handle, guide oil arrives unloader, it is opened, and major-minor compressing cylinder rodless cavity is directly connected fuel tank, machine load removal, the adjustable unloading time length of unloader, safe and reliable.Whereby, the utility model can reduce the heating of hydraulic system, and safe and reliable.
Brief description of the drawings
Fig. 1 is the hydraulic schematic diagram of the hydraulic system of a kind of static pile press of the utility model.
Reference numeral
1-clip pile oil cylinder, 2 support oil cylinders, the long ship oil cylinder of 3-, the short ship oil cylinder of 4-, 5-seven joint groups close banked direction control valves, 6-tetrad manual multiple-way valve, 7-piling unloader, 8-Manual relief valve, 9-precursor overflow valve, the main compressing cylinder of 10-, the secondary compressing cylinder of 11-, 12-differential valve group, the manual acceleration valve of 13-, 14-the first oil pump, 15-the second oil pump, 16-the 3rd oil pump, 17-oil strainer, 18-motor, 19-air filter, 20-content gauge, 21-hydraulic pilot handle, 22-gear pump, 23-guide's motor, 24-one way valve, 25-oil pressure gauge, 26-equalizing valve, 27-hydraulic control one-way valve.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the present embodiment provides a kind of hydraulic system of static pile press, comprise clip pile oil cylinder 1, piling oil cylinder, support oil cylinder 2, long ship oil cylinder 3 and short ship oil cylinder 4, clip pile oil cylinder 1, piling oil cylinder and support oil cylinder 2 are connected to seven joint groups and close banked direction control valves 5, long ship oil cylinder 3 and short ship oil cylinder 4 are connected to tetrad manual multiple-way valve 6, seven joint groups close banked direction control valves 5 and tetrad manual multiple-way valve 6 is connected to oil pump, and piling oil cylinder is communicated with a piling unloader 7.Hydraulic system also comprises Manual relief valve 8, and Manual relief valve 8 is connected to precursor overflow valve 9, and precursor overflow valve 9 is communicated with oil pump.In the present embodiment, piling oil cylinder comprises main compressing cylinder 10 and secondary compressing cylinder 11, and main compressing cylinder 10 is connected to seven joint groups by a differential valve group 12 and closes banked direction control valves 5, and differential valve group 12 is also connected with a manual acceleration valve 13.
In embodiment of the present utility model, oil pump comprises the first oil pump 14, the second oil pump 15 and the 3rd oil pump 16, the oil-out of the first oil pump 14 is communicated with tetrad manual multiple-way valve 6, tetrad manual multiple-way valve 6 closes banked direction control valves 5 with seven joint groups and is communicated with, and the oil-out of the second oil pump 15 and the 3rd oil pump 16 is jointly connected to tetrad manual multiple-way valve 6 and seven joint groups close the oil circuit between banked direction control valves 5.This first oil pump 14 is large displacement oil pump, and this second oil pump 15, the 3rd oil pump 16 are small displacement oil pump.Oil pump and seven joint groups close between banked direction control valves 5 and tetrad manual multiple-way valve 6 and are connected with one way valve 24, and this one way valve 24 closes in banked direction control valves 5 and tetrad manual multiple-way valve 6 unidirectional seven joint groups that enter of hydraulic oil of exporting in oil pump.
Preferably, hydraulic system also comprises oil strainer 17, motor 18, air filter 19 and content gauge 20.Wherein oil strainer 17 is connected respectively at oil pump with motor 18, and oil strainer 17 other ends are also connected with fuel tank, and for filtering the hydraulic oil that enters oil pump from fuel tank, this motor 18 is for driving oil pump.Air filter 19 and content gauge 20 connect respectively at fuel tank.
As shown in Figure 1, clip pile oil cylinder 1 is connected to seven joint groups by a hydraulic control one-way valve 27 and closes banked direction control valves 5.Seven joint groups close banked direction control valves 5, tetrad manual multiple-way valve 6 and clip pile oil cylinder 1 and are connected to respectively oil pressure gauge 25.
Hydraulic system also comprises hydraulic pilot handle 21, and hydraulic pilot handle 21 is communicated with a gear pump 22, and gear pump 22 connects guide's motor 23.This hydraulic pilot handle 21 comprises relief lever, main pressure handle, secondary handle and the clip pile handle of pressing.
The utility model drives oil pump feed by motor 18, and power is provided.The first oil pump 14 of large discharge capacity works independently and can make the walking of machine vertical and horizontal, and turns.The first oil pump 14 of the second oil pump 15, the 3rd oil pump 16 and the large discharge capacity of two small displacements is worked, and can complete clip pile, and major-minor is pressed piling, and supporting leg regulates the machine level that makes.Guide's motor 23 driven gear pumps 22, for guide's oil circuit provides oil pressure.
In the time starting the machine, operated pilot overflow valve 9 handles make precursor overflow valve 9 outside control mouths connect fuel tank, and system is without pressure, the oil of oil pump oil-out is directly by precursor overflow valve 9 oil sump tanks, hydraulic oil, without pipeline friction, reduces the friction of hydraulic oil in pipeline and valve the inside, the heating of reduction system.When system Manual relief valve 8 is during in meta O function, precursor overflow valve 9 outside control mouths block, oil pump loaded work piece.
Motor 18 starts, and oil pump closes banked direction control valves 5 and tetrad manual multiple-way valve 6 to clip pile oil cylinder 1, piling oil cylinder, support oil cylinder 2, long ship oil cylinder 3 and short ship oil cylinder 4 fuel feeding by seven joint groups, can carry out clip pile, piling work.Only have while work with the motor 18 of the first oil pump 14, machine can carry out longitudinally, laterally walk and turn.In the piling course of work, the second oil pump 15 and the 3rd oil pump 16 are worked simultaneously, and large flow is for major-minor pressure, clip pile, supporting leg leveling, and the second oil pump 15 and the 3rd oil pump 16 alternatives are opened, the convenient operating rate of controlling.
When the first pile is put into pile chuck, after having welded pile top, first to, to stake position, can operate tetrad manual multiple-way valve 6, now need the first oil pump 14 to work, long ship oil cylinder 3 and short ship oil cylinder 4 make machine arrive precalculated position.
Because building site is uneven, after machine arrives precalculated position, need to be by machine level-off, now the second oil pump 15 and the 3rd oil pump 16 are worked simultaneously, arrive seven joint groups and close banked direction control valves 5 behind hydraulic oil interflow, it is pilot operated valve device (being communicated with clip pile oil cylinder 1 and piling oil cylinder) that seven joint groups close banked direction control valves 5 first three connection, rear tetrad is hand-operated valve (being communicated with support oil cylinder 2), operation manual valve handle, and support oil cylinder 2 can stretch out the height needing as required, long ship lands, and short ship is liftoff.This support oil cylinder 2 is connected with an equalizing valve 26.
After machine adjustments level, clip pile handle in operating parts hydraulic pilot handle 21, makes pile chuck clamp stake, when hydraulic oil enters after clip pile oil cylinder 1, hydraulic control one-way valve 27 can make clip pile oil cylinder 1 rodless cavity have continuous, can find out clip pile pressure by the oil pressure gauge 25 being connected with clip pile oil cylinder 1.
Main pressure handle in operation hydraulic pilot handle 21, hydraulic oil is closed the 3rd of banked direction control valves 5 and is entered the rodless cavity of main compressing cylinder 10 by seven joint groups, and stake is pressed into the ground.While just starting piling, formation resistance is little, can judge piling pressure according to closing with seven joint groups the oil pressure gauge 25 that banked direction control valves 5 is connected, and the manual acceleration valve 13 of manual operation, works differential valve group 12, and at this moment, the large loculus of main compressing cylinder 10 is communicated with, and realizes differential rapid pressure pile.This differential valve group 12 is cartridge valve group.When stake is pressed into stratum when more and more darker, stratum is increasing to the reaction force of stake, now needs main compressing cylinder 10 and secondary compressing cylinder 11 to work simultaneously and stake could be pressed onto to certain depth, reaches the design bearing capacity of stake.Now hydraulic fluid pressure is large, in the time that part seven joint groups close second, the 3rd of banked direction control valves 5 and get back to meta O function, can make the pressurize of major-minor compressing cylinder, after dwell time finishes, operation pressure release handle, guide oil arrives piling unloader 7, and it is opened, major-minor compressing cylinder rodless cavity is directly connected fuel tank, machine load removal.The adjustable unloading time length of piling unloader 7, safe and reliable.
Seven joint groups of the present utility model close banked direction control valves 5 and tetrad manual multiple-way valve 6 is banked direction control valves, are that plural valve piece is combined, in order to handle the motion of multiple executive components.Because it can, according to the requirement of different hydraulic systems, be combined various valves, so its compact conformation, pipeline is simple, and the pressure loss is little, and easy for installation, so be widely used in engineering machinery, the walking machine of handling machinery and the multiple actuator movements of other requirement operations.
Differential valve group 12 of the present utility model is cartridge valve group, and cartridge valve and our said common hydraulic control valve are different, and its through-current capacity can reach 1000L/min, and latus rectum can reach 200～250mm.Valve core structure is simple, is active in one's movements, and good airproof performance.Its function ratio is more single, mainly realizes the on-off on liquid road, while being used in combination, could realize the control to system fluid direction, pressure and flow with common hydraulic control valve.
The utility model is safe and reliable, and piling speed is fast, and efficiency of construction is high, time saving and energy saving, and the utility model has solved the problem that great tonnage hydraulic static pile press exists, economic benefits to a certain extent.
Be appreciated that above description and accompanying drawing are only used for explaining the utility model, apparent, also can adopt additive method to change and amendment the utility model not departing from impracticable novel scope situation.
Claims (9)
1. the hydraulic system of a static pile press, it is characterized in that, comprise clip pile oil cylinder, piling oil cylinder, support oil cylinder, long ship oil cylinder and short ship oil cylinder, described clip pile oil cylinder, piling oil cylinder and support oil cylinder are connected to seven joint groups and close banked direction control valves, described long ship oil cylinder and short ship oil cylinder are connected to tetrad manual multiple-way valve, described seven joint groups close banked direction control valves and described tetrad manual multiple-way valve is connected to oil pump, and described piling oil cylinder is communicated with a piling unloader; Described hydraulic system also comprises Manual relief valve, and described Manual relief valve is connected to precursor overflow valve, and described precursor overflow valve is communicated with described oil pump.
2. hydraulic system according to claim 1, it is characterized in that, the piling oil cylinder of described hydraulic system comprises main compressing cylinder and secondary compressing cylinder, and described main compressing cylinder is connected to described seven joint groups by a differential valve group and closes banked direction control valves, and described differential valve group is also connected with a manual acceleration valve.
3. hydraulic system according to claim 1, is characterized in that, described hydraulic system also comprises the oil strainer and the motor that are connected with described oil pump, and described oil strainer is communicated with fuel tank.
4. hydraulic system according to claim 1, is characterized in that, described clip pile oil cylinder is connected to described seven joint groups by a hydraulic control one-way valve and closes banked direction control valves.
5. hydraulic system according to claim 1, is characterized in that, described hydraulic system also comprises the air filter and the content gauge that are connected to fuel tank.
6. hydraulic system according to claim 1, is characterized in that, described hydraulic system also comprises hydraulic pilot handle, and described hydraulic pilot handle is communicated with a gear pump, and described gear pump connects guide's motor.
7. hydraulic system according to claim 1, is characterized in that, described oil pump and described seven joint groups close between banked direction control valves and described tetrad manual multiple-way valve and are connected with one way valve.
8. hydraulic system according to claim 1, it is characterized in that, described oil pump comprises the first oil pump, the second oil pump and the 3rd oil pump, the oil-out of described the first oil pump is communicated with described tetrad manual multiple-way valve, described tetrad manual multiple-way valve closes banked direction control valves with described seven joint groups and is communicated with, and the oil-out of described the second oil pump and the 3rd oil pump is jointly connected to described tetrad manual multiple-way valve and described seven joint groups close the oil circuit between banked direction control valves.
9. hydraulic system according to claim 1, is characterized in that, described seven joint groups close banked direction control valves, described tetrad manual multiple-way valve and described clip pile oil cylinder and are connected to respectively an oil pressure gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343570.6U CN203904997U (en) | 2014-06-25 | 2014-06-25 | Hydraulic system of static pile press |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343570.6U CN203904997U (en) | 2014-06-25 | 2014-06-25 | Hydraulic system of static pile press |
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| CN203904997U true CN203904997U (en) | 2014-10-29 |
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| CN201420343570.6U Expired - Lifetime CN203904997U (en) | 2014-06-25 | 2014-06-25 | Hydraulic system of static pile press |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754035A (en) * | 2022-05-16 | 2022-07-15 | 江苏谷登桩工科技有限公司 | Quick pile lifting electronic control system of static pile press and control method thereof |
-
2014
- 2014-06-25 CN CN201420343570.6U patent/CN203904997U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754035A (en) * | 2022-05-16 | 2022-07-15 | 江苏谷登桩工科技有限公司 | Quick pile lifting electronic control system of static pile press and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 519040 Guangdong province Zhuhai City Sanzao town Jinwan District Jinhu West Road No. 52 Patentee after: ZHUHAI TIANLI HEAVY INDUSTRY Co.,Ltd. Address before: 519040 Guangdong province Zhuhai City Sanzao town Jinwan District Jinhu West Road No. 52 Patentee before: ZHUHAI TIANLI HEAVY ENGINEERING MACHINERY Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20141029 |
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| CX01 | Expiry of patent term |